{"id":197,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/pole-pass-frequency\/"},"modified":"2026-07-02T18:51:35","modified_gmt":"2026-07-02T18:51:35","slug":"pole-pass-frequency","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/mr\/glossary\/pole-pass-frequency\/","title":{"rendered":"What is Pole Pass Frequency? Motor Electromagnetic Forces"},"content":{"rendered":"<h1>\u092a\u094b\u0932 \u092a\u093e\u0938 \u092b\u094d\u0930\u093f\u0915\u094d\u0935\u0947\u0928\u094d\u0938\u0940 \u0938\u092e\u091c\u0942\u0928 \u0918\u0947\u0923\u0947<\/h1>\n\t\t<section class=\"woocommerce hestia-shop products is-shortcode\" id=\"products\" data-sorder=\"hestia_shop\" >\n\t\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<div class=\"hestia-shop-content\">\n\t\t\t<div class=\"row\" data-aos=\"fade-up\" >\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-1\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-1\/\" title=\"\u092a\u094b\u0930\u094d\u091f\u0947\u092c\u0932 \u092c\u0945\u0932\u0928\u094d\u0938\u0930 \u0906\u0923\u093f \u0915\u0902\u092a\u0928 \u0935\u093f\u0936\u094d\u0932\u0947\u0937\u0915 Balanset-1A\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A \u0938\u0902\u092a\u0942\u0930\u094d\u0923 \u0915\u093f\u091f \u092a\u094b\u0930\u094d\u091f\u0947\u092c\u0932 \u0938\u0902\u0924\u0941\u0932\u0915 \u0906\u0923\u093f \u0915\u0902\u092a\u0928 \u0935\u093f\u0936\u094d\u0932\u0947\u0937\u0915\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-272x182.webp 272w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/devices\/\" rel=\"tag\">Devices<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-1\/\" title=\"\u092a\u094b\u0930\u094d\u091f\u0947\u092c\u0932 \u092c\u0945\u0932\u0928\u094d\u0938\u0930 \u0906\u0923\u093f \u0915\u0902\u092a\u0928 \u0935\u093f\u0936\u094d\u0932\u0947\u0937\u0915 Balanset-1A\">\u092a\u094b\u0930\u094d\u091f\u0947\u092c\u0932 \u092c\u0945\u0932\u0947\u0928\u094d\u0938\u0930 &#038; \u0935\u094d\u0939\u093e\u092f\u092c\u094d\u0930\u0947\u0936\u0928 \u0905\u200d\u0945\u0928\u093e\u0932\u093e\u092f\u091d\u0930 Balanset-1A<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>1,975.00<\/span> + VAT (\u0932\u093e\u0917\u0942 \u0905\u0938\u0932\u094d\u092f\u093e\u0938)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/197?add-to-cart=986\" data-quantity=\"1\" data-product_id=\"986\" data-product_sku=\"BS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/197?add-to-cart=986\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_986\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"986\" data-product_sku=\"BS-1\" aria-label=\"Add to cart: \u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d\" rel=\"nofollow\" data-success_message=\"\u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_986\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/vibration-sensor\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/vibration-sensor\/\" title=\"\u0915\u0902\u092a\u0928 \u0938\u0902\u0935\u0947\u0926\u0915\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A \u0915\u0902\u092a\u0928 \u0938\u0902\u0935\u0947\u0926\u0928\u0936\u0940\u0932 \u091c\u0935\u0933\u0942\u0928\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3.webp 1280w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/vibration-sensor\/\" title=\"\u0915\u0902\u092a\u0928 \u0938\u0902\u0935\u0947\u0926\u0915\">\u0915\u0902\u092a\u0928 \u0938\u0902\u0935\u0947\u0926\u0915<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>90.00<\/span> + VAT (\u0932\u093e\u0917\u0942 \u0905\u0938\u0932\u094d\u092f\u093e\u0938)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/197?add-to-cart=1820\" data-quantity=\"1\" data-product_id=\"1820\" data-product_sku=\"VS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/197?add-to-cart=1820\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1820\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1820\" data-product_sku=\"VS-1\" aria-label=\"Add to cart: \u201cVibration sensor\u201d\" rel=\"nofollow\" data-success_message=\"\u201cVibration sensor\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1820\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/optical-sensor-for-balanset-and-arbalance\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"\u0911\u092a\u094d\u091f\u093f\u0915\u0932 \u0938\u0947\u0928\u094d\u0938\u0930 (\u0932\u0947\u091d\u0930 \u091f\u0945\u0915\u094b\u092e\u0940\u091f\u0930)\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"\u0911\u092a\u094d\u091f\u093f\u0915\u0932 \u0938\u0947\u0928\u094d\u0938\u0930 (\u0932\u0947\u091d\u0930 \u091f\u0945\u0915\u094b\u092e\u0940\u091f\u0930)\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-1536x1023.webp 1536w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU.webp 1600w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"\u0911\u092a\u094d\u091f\u093f\u0915\u0932 \u0938\u0947\u0928\u094d\u0938\u0930 (\u0932\u0947\u091d\u0930 \u091f\u0945\u0915\u094b\u092e\u0940\u091f\u0930)\">\u0911\u092a\u094d\u091f\u093f\u0915\u0932 \u0938\u0947\u0928\u094d\u0938\u0930 (\u0932\u0947\u091d\u0930 \u091f\u0945\u0915\u094b\u092e\u0940\u091f\u0930)<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>124.00<\/span> + VAT (\u0932\u093e\u0917\u0942 \u0905\u0938\u0932\u094d\u092f\u093e\u0938)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/197?add-to-cart=1832\" data-quantity=\"1\" data-product_id=\"1832\" data-product_sku=\"Tach-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/197?add-to-cart=1832\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1832\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1832\" data-product_sku=\"Tach-1\" aria-label=\"Add to cart: \u201cOptical Sensor (Laser Tachometer)\u201d\" rel=\"nofollow\" data-success_message=\"\u201cOptical Sensor (Laser Tachometer)\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1832\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-4\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-4\/\" title=\"Balanset-4\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Vibromera \u0930\u094b\u091f\u0930 \u0938\u0902\u0924\u0941\u0932\u0928 \u0915\u093f\u091f: \u0935\u0939\u0928 \u0915\u0947\u0938, \u092c\u0939\u0941-\u091a\u0945\u0928\u0932 \u0938\u093f\u0917\u094d\u0928\u0932 \u0915\u0902\u0921\u093f\u0936\u0928\u0930, \u0939\u093e\u0925 \u092a\u0915\u0921\u0928\u0947 \u0935\u093e\u0932\u0940 \u0935\u093f\u0936\u094d\u0932\u0947\u0937\u0915, \u091a\u0941\u0902\u092c\u0915\u0940\u092f \u0906\u0927\u093e\u0930, \u0915\u0902\u092a\u0928 \u0938\u0902\u0935\u0947\u0926\u0915, \u0906\u0923\u093f \u0915\u0949\u0907\u0932 \u0915\u0947\u092c\u0932.\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4.webp 640w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/devices\/\" rel=\"tag\">Devices<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-4\/\" title=\"Balanset-4\">Balanset-4<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>6,803.00<\/span> + VAT (\u0932\u093e\u0917\u0942 \u0905\u0938\u0932\u094d\u092f\u093e\u0938)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/197?add-to-cart=1833\" data-quantity=\"1\" data-product_id=\"1833\" data-product_sku=\"BS-4\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/197?add-to-cart=1833\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1833\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1833\" data-product_sku=\"BS-4\" aria-label=\"Add to cart: \u201cBalanset-4\u201d\" rel=\"nofollow\" data-success_message=\"\u201cBalanset-4\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1833\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div><!-- \/.row --><div class=\"row\">\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/magnet-stand\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/magnet-stand\/\" title=\"\u092e\u0945\u0917\u094d\u0928\u0947\u091f\u093f\u0915 \u0938\u094d\u091f\u0901\u0921 Insize-60-kgf\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Magnet base.\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36.webp 1280w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/magnet-stand\/\" title=\"\u092e\u0945\u0917\u094d\u0928\u0947\u091f\u093f\u0915 \u0938\u094d\u091f\u0901\u0921 Insize-60-kgf\">\u092e\u0945\u0917\u094d\u0928\u0947\u091f\u093f\u0915 \u0938\u094d\u091f\u0901\u0921 Insize-60-kgf<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>46.00<\/span> + VAT (\u0932\u093e\u0917\u0942 \u0905\u0938\u0932\u094d\u092f\u093e\u0938)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/197?add-to-cart=1852\" data-quantity=\"1\" data-product_id=\"1852\" data-product_sku=\"MS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/197?add-to-cart=1852\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1852\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1852\" data-product_sku=\"MS-1\" aria-label=\"Add to cart: \u201cMagnetic Stand Insize-60-kgf\u201d\" rel=\"nofollow\" data-success_message=\"\u201cMagnetic Stand Insize-60-kgf\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1852\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/reflective-tape\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/reflective-tape\/\" title=\"\u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0915 \u091f\u0947\u092a\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"\u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0915 \u091f\u0947\u092a\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-16x12.webp 16w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-272x182.webp 272w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/reflective-tape\/\" title=\"\u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0915 \u091f\u0947\u092a\">\u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0915 \u091f\u0947\u092a<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>10.00<\/span> + VAT (\u0932\u093e\u0917\u0942 \u0905\u0938\u0932\u094d\u092f\u093e\u0938)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/197?add-to-cart=2329\" data-quantity=\"1\" data-product_id=\"2329\" data-product_sku=\"rt-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/197?add-to-cart=2329\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_2329\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"2329\" data-product_sku=\"rt-1\" aria-label=\"Add to cart: \u201cReflective tape\u201d\" rel=\"nofollow\" data-success_message=\"\u201cReflective tape\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_2329\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/dynamic-balancer-balanset-1a\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/dynamic-balancer-balanset-1a\/\" title=\"\u0921\u093e\u092f\u0928\u093e\u092e\u093f\u0915 \u092c\u0945\u0932\u0928\u094d\u0938\u0930 \u201cBalanset-1A\u201d OEM\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A \u0915\u093f\u091f \u0938\u093e\u092e\u0917\u094d\u0930\u0940 \u0907\u0902\u091f\u0930\u092b\u0947\u0938 \u092f\u0941\u0928\u093f\u091f, \u0938\u0902\u0935\u0947\u0926\u0915, \u091f\u0945\u0915\u094b\u092e\u0940\u091f\u0930 \u0906\u0923\u093f \u0905\u0928\u0941\u0937\u0902\u0917\u0940 \u0938\u0939\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-1024x683.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-1536x1024.webp 1536w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-2048x1366.webp 2048w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-e1732998877834.webp 708w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/devices\/\" rel=\"tag\">Devices<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/dynamic-balancer-balanset-1a\/\" title=\"\u0921\u093e\u092f\u0928\u093e\u092e\u093f\u0915 \u092c\u0945\u0932\u0928\u094d\u0938\u0930 \u201cBalanset-1A\u201d OEM\">\u0921\u093e\u092f\u0928\u093e\u092e\u093f\u0915 \u092c\u0945\u0932\u0928\u094d\u0938\u0930 \u201cBalanset-1A\u201d OEM<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>1,735.00<\/span> + VAT (\u0932\u093e\u0917\u0942 \u0905\u0938\u0932\u094d\u092f\u093e\u0938)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/197?add-to-cart=4193\" data-quantity=\"1\" data-product_id=\"4193\" data-product_sku=\"BS-1OEM\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/197?add-to-cart=4193\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_4193\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"4193\" data-product_sku=\"BS-1OEM\" aria-label=\"Add to cart: \u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d\" rel=\"nofollow\" data-success_message=\"\u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_4193\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/section>\n\t\t\n<p><strong>\u092a\u094b\u0932 \u092a\u093e\u0938 \u092b\u094d\u0930\u093f\u0915\u094d\u0935\u0947\u0928\u094d\u0938\u0940<\/strong> (PPF) is the low-frequency <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/vibration\/\">vibration<\/a> component generated in an AC induction motor as the rotating magnetic field slips past the rotor. It is calculated as the number of poles multiplied by the <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/slip-frequency\/\">\u0938\u094d\u0932\u093f\u092a \u0935\u093e\u0930\u0902\u0935\u093e\u0930\u0924\u093e<\/a>: PPF = number of poles \u00d7 (synchronous speed \u2212 actual speed) \/ 60. Because slip is small, PPF is a very low frequency \u2014 typically only a few hertz \u2014 and it usually shows up not as a stand-alone peak but as <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/sidebands\/\">sidebands<\/a> spaced at PPF around the running-speed and line-frequency components. That slip-related modulation is greatly amplified when the motor has <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/air-gap\/\">air-gap<\/a> eccentricity, broken rotor bars, or a rotor-to-stator alignment problem. Because of this, PPF is one of the most useful tools for separating <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/electrical-faults\/\">\u0935\u093f\u0926\u094d\u092f\u0941\u0924 \u0926\u094b\u0937\u093e\u0902\u091a\u093e<\/a> \u092f\u093e\u0902\u0928\u093e \u092a\u0942\u0930\u094d\u0923\u092a\u0923\u0947 \u092f\u093e\u0902\u0924\u094d\u0930\u093f\u0915 \u0938\u092e\u0938\u094d\u092f\u093e\u0902\u092a\u093e\u0938\u0942\u0928 \u0935\u0947\u0917\u0933\u0947 \u0913\u0933\u0916\u0923\u094d\u092f\u093e\u0938\u093e\u0920\u0940 \u0938\u0930\u094d\u0935\u093e\u0924 \u0909\u092a\u092f\u0941\u0915\u094d\u0924 \u0938\u093e\u0927\u0928\u093e\u0902\u092a\u0948\u0915\u0940 \u090f\u0915 \u0906\u0939\u0947.<\/p>\n<p>PPF matters diagnostically because elevated <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/sidebands\/\">sidebands<\/a> spaced at this frequency point squarely at an electromagnetic problem \u2014 an eccentric rotor, broken rotor bars, a non-uniform air gap, or dynamic rotor\u2013stator interaction \u2014 rather than at <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/unbalance\/\">unbalance<\/a> or <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/misalignment\/\">misalignment<\/a>. \u092f\u094b\u0917\u094d\u092f \u092a\u094d\u0930\u0915\u093e\u0930\u0947 \u0935\u093e\u091a\u0932\u094d\u092f\u093e\u0938, \u0935\u093f\u0936\u094d\u0932\u0947\u0937\u0915\u093e\u0928\u0947 \u092e\u094b\u091f\u0930 \u0909\u0918\u0921\u093e\u0935\u0940 \u0915\u0940 \u0921\u094d\u0930\u093e\u0907\u0935\u094d\u0939-\u091f\u094d\u0930\u0947\u0928\u092e\u0927\u094d\u092f\u0947 \u0907\u0924\u0930\u0924\u094d\u0930 \u0924\u092a\u093e\u0938\u093e\u0935\u0947 \u0939\u0947 \u0924\u0947 \u0938\u093e\u0902\u0917\u0924\u0947.<\/p>\n<h2>1. Pole Pass Frequency \u091a\u0940 \u0917\u0923\u0928\u093e<\/h2>\n<h3>\u092e\u0942\u0932\u092d\u0942\u0924 \u0938\u0942\u0924\u094d\u0930<\/h3>\n<ul>\n<li><strong>PPF = P \u00d7 (N<sub>\u0938\u092e\u0915\u093e\u0932\u093f\u0915<\/sub> \u2212 N) \/ 60<\/strong><\/li>\n<li>\u091c\u093f\u0925\u0947 <strong>P<\/strong> = \u0927\u094d\u0930\u0941\u0935\u093e\u0902\u091a\u0940 \u0938\u0902\u0916\u094d\u092f\u093e,<\/li>\n<li><strong>N<sub>\u0938\u092e\u0915\u093e\u0932\u093f\u0915<\/sub><\/strong> = synchronous speed in RPM (N<sub>\u0938\u092e\u0915\u093e\u0932\u093f\u0915<\/sub> = 120 \u00d7 line frequency \/ P),<\/li>\n<li><strong>N<\/strong> = RPM \u092e\u0927\u0940\u0932 \u092a\u094d\u0930\u0924\u094d\u092f\u0915\u094d\u0937 \u0930\u094b\u091f\u0930 \u0935\u0947\u0917,<\/li>\n<li>and the result is in Hz. The term (N<sub>\u0938\u092e\u0915\u093e\u0932\u093f\u0915<\/sub> \u2212 N) \/ 60 is the slip frequency expressed in Hz.<\/li>\n<\/ul>\n<p>Note that PPF is built on the <em>difference<\/em> between synchronous and actual speed \u2014 the <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/slip-frequency\/\">\u0938\u094d\u0932\u093f\u092a<\/a>. At no load an induction motor runs almost at synchronous speed, so PPF approaches zero; as load grows, slip and therefore PPF grow with it, typically ending up in the range of roughly 0.5\u20133.5 Hz at rated load. Do not confuse PPF with the purely mechanical order P \u00d7 running speed (for a 4-pole motor at 1750 RPM that is about 116.7 Hz) \u2014 that is a harmonic of shaft rotation, not pole pass frequency. When you need to convert running speed into a family of orders quickly, our <a href=\"https:\/\/vibromera.eu\/mr\/calculators\/harmonic-frequency-calculator\/\">\u0939\u093e\u0930\u094d\u092e\u094b\u0928\u093f\u0915 \u0935\u093e\u0930\u0902\u0935\u093e\u0930\u0924\u093e \u0915\u0945\u0932\u094d\u0915\u094d\u092f\u0941\u0932\u0947\u091f\u0930<\/a> 1\u00d7\u201310\u00d7 orders \u092e\u0927\u094d\u092f\u0947 RPM \u091a\u0947 Hz \u092e\u0927\u094d\u092f\u0947 \u0930\u0942\u092a\u093e\u0902\u0924\u0930 \u0915\u0930\u0924\u0947, \u0906\u0923\u093f <a href=\"https:\/\/vibromera.eu\/mr\/calculators\/motor-electrical-frequencies\/\">\u092e\u094b\u091f\u0930 \u0935\u093f\u0926\u094d\u092f\u0941\u0924 \u0926\u094b\u0937 \u0935\u093e\u0930\u0902\u0935\u093e\u0930\u0924\u093e \u0915\u0945\u0932\u094d\u0915\u094d\u092f\u0941\u0932\u0947\u091f\u0930<\/a> \u0935\u093f\u0926\u094d\u092f\u0941\u0924\u091a\u0941\u0902\u092c\u0915\u0940\u092f \u0935\u093e\u0930\u0902\u0935\u093e\u0930\u093f\u0924\u093e \u092c\u093e\u091c\u0942\u092c\u093e\u091c\u0942\u0928\u0947 \u092e\u093e\u0902\u0921\u0924\u0947.<\/p>\n<h3>\u0915\u093e\u0930\u094d\u092f \u0915\u0947\u0932\u0947\u0932\u0940 \u0909\u0926\u093e\u0939\u0930\u0923\u0947<\/h3>\n<p><strong>1750 RPM (60 Hz supply) \u0935\u0930\u0940\u0932 4-pole \u092e\u094b\u091f\u0930:<\/strong><\/p>\n<ul>\n<li>Synchronous speed N<sub>\u0938\u092e\u0915\u093e\u0932\u093f\u0915<\/sub> = 120 \u00d7 60 \/ 4 = 1800 RPM.<\/li>\n<li>Slip frequency = (1800 \u2212 1750) \/ 60 = 0.83 Hz.<\/li>\n<li><strong>PPF = 4 \u00d7 (1800 \u2212 1750) \/ 60 = 3.33 Hz<\/strong><\/li>\n<li>In the vibration <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/spectrum\/\">spectrum<\/a> it appears as sidebands spaced \u00b13.33 Hz around the 1\u00d7 running-speed peak (29.2 Hz) and around 2\u00d7 line frequency (120 Hz) \u2014 a pattern diagnostic for eccentricity and broken rotor bars.<\/li>\n<\/ul>\n<p><strong>970 RPM (50 Hz supply) \u0935\u0930\u0940\u0932 6-pole \u092e\u094b\u091f\u0930:<\/strong><\/p>\n<ul>\n<li>Synchronous speed N<sub>\u0938\u092e\u0915\u093e\u0932\u093f\u0915<\/sub> = 120 \u00d7 50 \/ 6 = 1000 RPM.<\/li>\n<li>Slip frequency = (1000 \u2212 970) \/ 60 = 0.5 Hz.<\/li>\n<li><strong>PPF = 6 \u00d7 (1000 \u2212 970) \/ 60 = 3.0 Hz<\/strong><\/li>\n<li>Sidebands spaced only \u00b13.0 Hz around the 1\u00d7 peak (16.2 Hz) or around 2\u00d7 line frequency (100 Hz) are easy to miss.<\/li>\n<li>Resolving them demands careful, high-resolution <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/spectral-analysis\/\">\u0935\u0930\u094d\u0923\u0915\u094d\u0930\u092e \u0935\u093f\u0936\u094d\u0932\u0947\u0937\u0923<\/a>.<\/li>\n<\/ul>\n<h2>2. \u092d\u094c\u0924\u093f\u0915 \u092f\u0902\u0924\u094d\u0930\u0923\u093e<\/h2>\n<h3>\u0935\u093f\u0926\u094d\u092f\u0941\u0924\u091a\u0941\u0902\u092c\u0915\u0940\u092f \u092c\u0932 \u0915\u0938\u0947 \u0928\u093f\u0930\u094d\u092e\u093e\u0923 \u0939\u094b\u0924\u0947<\/h3>\n<p>PPF \u0928\u093f\u0930\u094d\u092e\u093e\u0923 \u0915\u0930\u0923\u093e\u0931\u094d\u092f\u093e \u0918\u091f\u0928\u093e\u0902\u091a\u0940 \u0938\u093e\u0916\u0933\u0940 \u0938\u0930\u0933 \u0906\u0939\u0947:<\/p>\n<ol>\n<li>\u0938\u094d\u091f\u0947\u091f\u0930 \u0935\u093e\u0907\u0902\u0921\u093f\u0902\u0917\u094d\u091c \u090f\u0915 \u091a\u0941\u0902\u092c\u0915\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930 \u0928\u093f\u0930\u094d\u092e\u093e\u0923 \u0915\u0930\u0924\u093e\u0924 \u091c\u0947 \u0938\u093f\u0902\u0915\u094d\u0930\u094b\u0928\u0938 \u0917\u0924\u0940\u0928\u0947 \u092b\u093f\u0930\u0924\u0947.<\/li>\n<li>\u0924\u0947 field N\u2013S\u2013N\u2013S \u0928\u092e\u0941\u0928\u094d\u092f\u093e\u0924 \u091a\u0941\u0902\u092c\u0915\u0940\u092f \u0927\u094d\u0930\u0941\u0935\u093e\u0902\u092e\u0927\u094d\u092f\u0947 \u092e\u093e\u0902\u0921\u0932\u0947\u0932\u0947 \u0905\u0938\u0924\u0947.<\/li>\n<li>The rotor runs slightly slower because of slip, so the field poles continuously drift past the rotor rather than staying locked to it.<\/li>\n<li>Each time a field pole slips past a given spot on the rotor (a high-resistance bar, an eccentric side of the air gap), the magnetic force acting on that spot is modulated.<\/li>\n<li>\u091c\u0930 <strong>P<\/strong> poles, that spot is passed <strong>P<\/strong> times per slip cycle.<\/li>\n<li>The frequency of the resulting modulation is therefore P \u00d7 slip frequency = PPF \u2014 a slow &#8220;beating&#8221; superimposed on the running-speed and line-frequency vibration.<\/li>\n<\/ol>\n<h3>\u0938\u092e\u093e\u0928 air gap \u2014 \u090f\u0915 \u0928\u093f\u0930\u094b\u0917\u0940 \u092e\u094b\u091f\u0930<\/h3>\n<ul>\n<li>\u0930\u094b\u091f\u0930 \u0938\u094d\u091f\u0947\u091f\u0930\u091a\u094d\u092f\u093e bore \u092e\u0927\u094d\u092f\u0947 \u092e\u0927\u094d\u092f\u092d\u093e\u0917\u0940 \u0905\u0938\u0924\u094b.<\/li>\n<li>air gap \u0938\u0902\u092a\u0942\u0930\u094d\u0923 \u092a\u0930\u093f\u0918\u093e\u092d\u094b\u0935\u0924\u0940 \u090f\u0915\u0938\u092e\u093e\u0928 \u0905\u0938\u0924\u094b.<\/li>\n<li>\u091a\u0941\u0902\u092c\u0915\u0940\u092f \u092c\u0932\u0902 \u0938\u0902\u0924\u0941\u0932\u093f\u0924 \u0905\u0938\u0924\u093e\u0924 \u0906\u0923\u093f \u090f\u0915\u092e\u0947\u0915\u093e\u0902\u0928\u093e \u0930\u0926\u094d\u0926 \u0915\u0930\u0924\u093e\u0924.<\/li>\n<li>PPF-related modulation is consequently very low in amplitude.<\/li>\n<\/ul>\n<h3>\u0935\u093f\u0915\u0947\u0902\u0926\u094d\u0930\u093f\u0924 air gap \u2014 \u0926\u094b\u0937\u092a\u0942\u0930\u094d\u0923 \u092e\u094b\u091f\u0930<\/h3>\n<ul>\n<li>\u0930\u094b\u091f\u0930 <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/bearing-wear\/\">\u092c\u0947\u0905\u0930\u093f\u0902\u0917 \u0918\u093f\u0938\u093e\u0935\u091f<\/a>, \u090f\u0915 <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/bent-shaft\/\">\u0935\u093e\u0915\u0932\u0947\u0932\u093e \u0936\u093e\u092b\u094d\u091f<\/a>\u092e\u0941\u0933\u0947 \u0915\u093f\u0902\u0935\u093e \u0909\u0924\u094d\u092a\u093e\u0926\u0928\u093e\u0924\u0940\u0932 \u0924\u094d\u0930\u0941\u091f\u0940\u092e\u0941\u0933\u0947 \u092e\u0927\u094d\u092f\u093e\u092a\u093e\u0938\u0942\u0928 \u0939\u091f\u0942\u0928 \u092c\u0938\u0924\u094b.<\/li>\n<li>\u090f\u0915\u093e \u092c\u093e\u091c\u0942\u0932\u093e air gap \u0915\u092e\u0940 \u0906\u0923\u093f \u0935\u093f\u0930\u0941\u0926\u094d\u0927 \u092c\u093e\u091c\u0942\u0932\u093e \u091c\u093e\u0938\u094d\u0924 \u0905\u0938\u0924\u094b.<\/li>\n<li>\u091a\u0941\u0902\u092c\u0915\u0940\u092f \u092c\u0932\u0902 \u0905\u0938\u0902\u0924\u0941\u0932\u093f\u0924 \u0939\u094b\u0924\u093e\u0924 \u2014 gap \u091c\u093f\u0925\u0947 \u0915\u092e\u0940 \u0905\u0938\u0924\u094b \u0924\u093f\u0925\u0947 \u0924\u0940 \u091c\u093e\u0938\u094d\u0924 \u0905\u0938\u0924\u093e\u0924.<\/li>\n<li>A net radial force appears \u2014 <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/magnetic-pull\/\">\u0905\u0938\u0902\u0924\u0941\u0932\u093f\u0924 \u091a\u0941\u0902\u092c\u0915\u0940\u092f \u0916\u0947\u091a<\/a> \u2014 and it is modulated at PPF as the field poles slip past the narrow side of the gap.<\/li>\n<li>Sidebands spaced at PPF develop around the main spectral peaks and grow with severity.<\/li>\n<\/ul>\n<h2>3. Sidebands \u0906\u0923\u093f \u0928\u093f\u0926\u093e\u0928 \u0928\u092e\u0941\u0928\u0947<\/h2>\n<h3>\u0938\u094d\u0925\u093f\u0930 \u0935\u093f\u0915\u0947\u0902\u0926\u094d\u0930\u093f\u0924\u092a\u0923\u093e<\/h3>\n<p>\u092f\u0947\u0925\u0947 \u0930\u094b\u091f\u0930\u091a\u0947 \u0915\u0947\u0902\u0926\u094d\u0930 \u0938\u0930\u0915\u0932\u0947\u0932\u0947 \u0905\u0938\u0924\u0947 \u092a\u0923 \u0938\u094d\u091f\u0947\u091f\u0930\u091a\u094d\u092f\u093e \u0938\u0902\u0926\u0930\u094d\u092d\u093e\u0924 \u0938\u094d\u0925\u093f\u0930 \u0905\u0938\u0924\u0947:<\/p>\n<ul>\n<li><strong>\u0928\u092e\u0941\u0928\u093e:<\/strong> an elevated 2\u00d7 line frequency component (100\/120 Hz); pole-pass sidebands are weak or absent because the offset does not rotate with the shaft.<\/li>\n<li><strong>\u0915\u093e\u0930\u0923:<\/strong> bearing wear, frame or end-bell distortion, or a machining error in the stator bore.<\/li>\n<li><strong>\u0906\u092f\u093e\u092e:<\/strong> the 2\u00d7 line frequency amplitude indicates the severity of the eccentricity.<\/li>\n<\/ul>\n<h3>\u0917\u0924\u093f\u092e\u093e\u0928 \u0935\u093f\u0915\u0947\u0902\u0926\u094d\u0930\u093f\u0924\u092a\u0923\u093e<\/h3>\n<p>\u092f\u0947\u0925\u0947 \u0930\u094b\u091f\u0930\u091a\u0947 \u0915\u0947\u0902\u0926\u094d\u0930 \u0938\u094d\u091f\u0947\u091f\u0930\u091a\u094d\u092f\u093e \u0915\u0947\u0902\u0926\u094d\u0930\u093e\u092d\u094b\u0935\u0924\u0940 \u092a\u0930\u093f\u092d\u094d\u0930\u092e\u0923 \u0915\u0930\u0924\u0947 \u0915\u093f\u0902\u0935\u093e whirl \u0939\u094b\u0924\u0947:<\/p>\n<ul>\n<li><strong>\u0928\u092e\u0941\u0928\u093e:<\/strong> 1\u00d7 running speed and 2\u00d7 line frequency peaks with sidebands spaced at PPF (e.g. \u00b13.33 Hz in the 4-pole example above).<\/li>\n<li><strong>\u0915\u093e\u0930\u0923\u0947:<\/strong> a bent shaft, rotor <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/rotor-eccentricity\/\">\u0935\u093f\u0915\u0947\u0902\u0926\u094d\u0930\u0924\u093e<\/a>, rotor-to-stator <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/rotor-rub\/\">rub<\/a> \u0915\u093f\u0902\u0935\u093e bearing <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/looseness\/\">\u0938\u0948\u0932\u092a\u0923\u093e<\/a>.<\/li>\n<li><strong>\u0905\u0927\u093f\u0915 \u0917\u0902\u092d\u0940\u0930:<\/strong> it signals an active dynamic interaction rather than a fixed offset. The same pole-pass sideband family around 1\u00d7 and its harmonics is the classic signature of broken rotor bars.<\/li>\n<\/ul>\n<h3>\u092e\u093f\u0936\u094d\u0930 \u0935\u093f\u0915\u0947\u0902\u0926\u094d\u0930\u093f\u0924\u092a\u0923\u093e<\/h3>\n<ul>\n<li>\u0938\u094d\u0925\u093f\u0930 \u0906\u0923\u093f \u0917\u0924\u093f\u092e\u093e\u0928 \u092a\u0930\u093f\u0923\u093e\u092e\u093e\u0902\u091a\u093e \u0938\u0902\u092f\u094b\u0917.<\/li>\n<li>\u092a\u094d\u0930\u0924\u094d\u092f\u0915\u094d\u0937 \u092e\u094b\u091f\u0930\u092e\u0927\u094d\u092f\u0947 \u0939\u0940\u091a \u0938\u0930\u094d\u0935\u093e\u0924 \u0938\u093e\u092e\u093e\u0928\u094d\u092f \u0905\u0935\u0938\u094d\u0925\u093e \u0906\u0922\u0933\u0924\u0947.<\/li>\n<li>\u092f\u093e\u092e\u0941\u0933\u0947 \u0917\u0941\u0902\u0924\u093e\u0917\u0941\u0902\u0924\u0940\u091a\u0947 sideband \u0928\u092e\u0941\u0928\u0947 \u0924\u092f\u093e\u0930 \u0939\u094b\u0924\u093e\u0924.<\/li>\n<li>\u092f\u093e\u091a\u093e \u092f\u094b\u0917\u094d\u092f \u0905\u0930\u094d\u0925 \u0932\u093e\u0935\u0923\u094d\u092f\u093e\u0938\u093e\u0920\u0940 \u0915\u093e\u0933\u091c\u0940\u092a\u0942\u0930\u094d\u0935\u0915 \u0935\u093f\u0936\u094d\u0932\u0947\u0937\u0923 \u0906\u0935\u0936\u094d\u092f\u0915 \u0905\u0938\u0924\u0947.<\/li>\n<\/ul>\n<h2>4. \u0928\u093f\u0926\u093e\u0928\u093e\u0924\u094d\u092e\u0915 \u0905\u0930\u094d\u0925 \u0932\u093e\u0935\u0923\u0947<\/h2>\n<p>Because PPF is only a few hertz, it is judged through the strength of its sidebands around the 1\u00d7 running-speed and 2\u00d7 line-frequency peaks, read as a continuum:<\/p>\n<h3>Low \u2014 pole-pass sidebands barely visible above the noise floor<\/h3>\n<ul>\n<li>\u0938\u093e\u092e\u093e\u0928\u094d\u092f \u0938\u094d\u0925\u093f\u0924\u0940.<\/li>\n<li>\u090f\u0915\u0938\u092e\u093e\u0928 air gap \u0906\u0923\u093f \u091a\u093e\u0902\u0917\u0932\u0940 rotor\u2013stator concentricity.<\/li>\n<li>\u0926\u0941\u0930\u0941\u0938\u094d\u0924\u0940\u091a\u0940 \u0917\u0930\u091c \u0928\u093e\u0939\u0940.<\/li>\n<\/ul>\n<h3>Moderate \u2014 sidebands clearly visible but far below the carrier peak<\/h3>\n<ul>\n<li>Slight air-gap non-uniformity or early rotor-circuit degradation.<\/li>\n<li>trend \u092a\u093e\u0939\u0924 \u0930\u093e\u0939\u093e \u0906\u0923\u093f bearing \u091a\u0940 \u0938\u094d\u0925\u093f\u0924\u0940 \u0924\u092a\u093e\u0938\u093e.<\/li>\n<li>\u0930\u094b\u091f\u0930\u091a\u0940 \u0938\u094d\u0925\u093f\u0924\u0940 \u0938\u0939\u091c \u0924\u092a\u093e\u0938\u0924\u093e \u092f\u0947\u0924 \u0905\u0938\u0932\u094d\u092f\u093e\u0938 \u0924\u0940 \u092a\u0921\u0924\u093e\u0933\u093e.<\/li>\n<li>\u0924\u093e\u0924\u0921\u0940\u0928\u0947 \u0917\u0902\u092d\u0940\u0930 \u0928\u093e\u0939\u0940, \u092a\u0923 \u092f\u093e\u0915\u0921\u0947 \u0932\u0915\u094d\u0937 \u0926\u0947\u0923\u0947 \u0906\u0935\u0936\u094d\u092f\u0915 \u0906\u0939\u0947.<\/li>\n<\/ul>\n<h3>High \u2014 sidebands approaching the carrier peak in amplitude<\/h3>\n<ul>\n<li>Significant eccentricity, broken rotor bars, or an air-gap problem.<\/li>\n<li>A pronounced low-frequency &#8220;beat&#8221; may be felt or heard at PPF.<\/li>\n<li>rotor-to-stator contact \u091a\u093e \u0927\u094b\u0915\u093e.<\/li>\n<li>\u0935\u093e\u0922\u0924\u0940 \u0935\u093f\u0926\u094d\u092f\u0941\u0924\u091a\u0941\u0902\u092c\u0915\u0940\u092f \u092c\u0932\u0902 \u091c\u0940 \u0928\u0941\u0915\u0938\u093e\u0928 \u0935\u0947\u0917\u093e\u0928\u0947 \u0935\u093e\u0922\u0935\u0924\u093e\u0924.<\/li>\n<li>\u0926\u0941\u0930\u0941\u0938\u094d\u0924\u0940 \u0915\u093f\u0902\u0935\u093e \u092c\u0926\u0932\u093e\u091a\u0940 \u092f\u094b\u091c\u0928\u093e \u0915\u0930\u093e.<\/li>\n<\/ul>\n<p>\u092a\u094d\u0930\u0924\u094d\u092f\u0915\u094d\u0937\u093e\u0924 \u0935\u093f\u0936\u094d\u0932\u0947\u0937\u0915 \u0915\u094d\u0935\u091a\u093f\u0924\u091a PPF \u0932\u093e \u090f\u0915\u091f\u094d\u092f\u093e\u0928\u0947 \u0924\u092a\u093e\u0938\u0924\u094b. bearing housing \u0935\u0930 \u0935\u093e\u092a\u0930\u0932\u093e \u091c\u093e\u0923\u093e\u0930\u093e <a href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-1\/\">Balanset-1A<\/a>, used at the bearing housings, captures the spectrum and resolves the pole-pass sidebands around the 1\u00d7 and line-frequency peaks \u2014 and, just as importantly, confirms whether the dominant component is electromagnetic or the simple 1\u00d7 peak of a mechanical fault. That distinction decides everything that follows: an electromagnetic signature sends you inside the motor, while a clean 1\u00d7 peak that disappears the instant power is cut points to <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/unbalance\/\">unbalance<\/a> \u091c\u094d\u092f\u093e\u0932\u093e \u0924\u0941\u092e\u094d\u0939\u0940 <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/field-balancing\/\">\u0915\u094d\u0937\u0947\u0924\u094d\u0930 \u0938\u0902\u0924\u0941\u0932\u0928<\/a> \u0930\u094b\u091f\u0930 \u091c\u093e\u0917\u0947\u0935\u0930\u091a \u0938\u0902\u0924\u0941\u0932\u093f\u0924 \u0915\u0930\u0942\u0928 \u0926\u0941\u0930\u0941\u0938\u094d\u0924 \u0915\u0930\u0942 \u0936\u0915\u0924\u093e.<\/p>\n<h2>5. \u0907\u0924\u0930 \u092e\u094b\u091f\u0930 \u0935\u093e\u0930\u0902\u0935\u093e\u0930\u093f\u0924\u093e\u0902\u0936\u0940 \u0938\u0902\u092c\u0902\u0927<\/h2>\n<p>PPF \u0939\u093e \u0917\u0930\u094d\u0926\u0940\u091a\u094d\u092f\u093e motor spectrum \u092e\u0927\u0940\u0932 \u090f\u0915 tone \u0906\u0939\u0947, \u0906\u0923\u093f \u0924\u094b \u0936\u0947\u091c\u093e\u0930\u091a\u094d\u092f\u093e \u0918\u091f\u0915\u093e\u0902\u091a\u094d\u092f\u093e \u0924\u0941\u0932\u0928\u0947\u0924 \u0915\u0941\u0920\u0947 \u092c\u0938\u0924\u094b \u0939\u0947 \u0913\u0933\u0916\u0923\u0947 \u092e\u094d\u0939\u0923\u091c\u0947 \u0928\u093f\u092e\u094d\u092e\u0940 \u0932\u0922\u093e\u0908 \u091c\u093f\u0902\u0915\u0923\u0947. 60 Hz supply \u0935\u0930\u0940\u0932 4-pole, 1750 RPM \u092e\u094b\u091f\u0930\u0938\u093e\u0920\u0940 \u090f\u0915 \u0938\u0930\u094d\u0935\u0938\u093e\u0927\u093e\u0930\u0923 \u0936\u094d\u0930\u0947\u0923\u0940 \u0905\u0936\u0940 \u0906\u0939\u0947:<\/p>\n<ul>\n<li><strong>Slip frequency:<\/strong> (1800 \u2212 1750) \/ 60 \u2248 0.83 Hz.<\/li>\n<li><strong>PPF:<\/strong> P \u00d7 slip frequency \u2014 about 3.3 Hz here, the lowest tone in the family.<\/li>\n<li><strong><a href=\"https:\/\/vibromera.eu\/mr\/glossary\/running-speed\/\">\u091a\u093e\u0932\u0942 \u0935\u0947\u0917<\/a> (1\u00d7):<\/strong> about 29.2 Hz.<\/li>\n<li><strong><a href=\"https:\/\/vibromera.eu\/mr\/glossary\/electrical-frequency\/\">Line frequency<\/a>:<\/strong> 60 Hz (or 50 Hz in Europe).<\/li>\n<li><strong>Rotor mechanical order P \u00d7 running speed:<\/strong> about 117 Hz \u2014 often mistaken for PPF, but it is a shaft-speed harmonic.<\/li>\n<li><strong>2\u00d7 \u0932\u093e\u0908\u0928 \u0935\u093e\u0930\u0902\u0935\u093e\u0930\u0924\u093e:<\/strong> 120 Hz (or 100 Hz) \u2014 the key electromagnetic component for eccentricity.<\/li>\n<li><strong><a href=\"https:\/\/vibromera.eu\/mr\/glossary\/motor-bar-pass-frequency\/\">Rotor bar pass frequency<\/a>:<\/strong> number of rotor bars \u00d7 running speed, up in the kilohertz range.<\/li>\n<\/ul>\n<p>The close spacing of 2\u00d7 line frequency (120 Hz) and the nearby <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/harmonics\/\">harmonics<\/a> of running speed (the 4th order sits at about 117 Hz here) is exactly why electromagnetic faults are so easily confused with mechanical ones \u2014 and why the fine pole-pass sideband structure, not amplitude alone, is the deciding clue. Where the picture remains ambiguous, switching off the supply is the definitive test: an electromagnetic component vanishes instantly with the field, whereas a mechanical one decays only as the rotor coasts down.<\/p>\n<h2>6. \u0926\u0941\u0930\u0941\u0938\u094d\u0924\u0940\u091a\u094d\u092f\u093e \u092a\u0926\u094d\u0927\u0924\u0940<\/h2>\n<h3>\u092f\u093e\u0902\u0924\u094d\u0930\u093f\u0915 \u0935\u093f\u0915\u0947\u0902\u0926\u094d\u0930\u093f\u0924\u092a\u0923\u093e\u0938\u093e\u0920\u0940<\/h3>\n<ul>\n<li>\u092f\u094b\u0917\u094d\u092f rotor centring \u092a\u0941\u0928\u0930\u094d\u0938\u094d\u0925\u093e\u092a\u093f\u0924 \u0915\u0930\u0923\u094d\u092f\u093e\u0938\u093e\u0920\u0940 \u091d\u093f\u091c\u0932\u0947\u0932\u0947 bearings \u092c\u0926\u0932\u093e.<\/li>\n<li>\u0935\u093e\u0915\u0932\u0947\u0932\u093e shaft \u0926\u0941\u0930\u0941\u0938\u094d\u0924 \u0915\u0930\u093e \u0915\u093f\u0902\u0935\u093e rotor \u092c\u0926\u0932\u093e.<\/li>\n<li>\u0926\u094b\u0937 \u0938\u094d\u0925\u093e\u092a\u0928\u0947\u0924\u0940\u0932 \u091a\u0942\u0915 \u0905\u0938\u0932\u094d\u092f\u093e\u0938 rotor \u092a\u0941\u0928\u094d\u0939\u093e \u092c\u0938\u0935\u093e.<\/li>\n<li>end-bell alignment \u0906\u0923\u093f bolt tightness \u092a\u0921\u0924\u093e\u0933\u093e.<\/li>\n<\/ul>\n<h3>\u0928\u093f\u0930\u094d\u092e\u093f\u0924\u0940\u0924\u0940\u0932 eccentricity \u0938\u093e\u0920\u0940<\/h3>\n<ul>\n<li>\u0917\u0902\u092d\u0940\u0930 \u092a\u0930\u093f\u0938\u094d\u0925\u093f\u0924\u0940\u0924 rotor \u0915\u093f\u0902\u0935\u093e stator \u091a\u0947 reboring \u0915\u0930\u093e\u0935\u0947 \u0932\u093e\u0917\u0942 \u0936\u0915\u0924\u0947.<\/li>\n<li>\u0906\u0930\u094d\u0925\u093f\u0915\u0926\u0943\u0937\u094d\u091f\u094d\u092f\u093e \u092f\u094b\u0917\u094d\u092f \u0905\u0938\u0932\u094d\u092f\u093e\u0938 \u092e\u094b\u091f\u0930 \u092c\u0926\u0932\u093e.<\/li>\n<li>\u0915\u0902\u092a\u0928 \u0938\u094d\u0935\u0940\u0915\u093e\u0930\u094d\u092f \u092e\u0930\u094d\u092f\u093e\u0926\u0947\u0924 \u0930\u093e\u0939\u093f\u0932\u094d\u092f\u093e\u0938 \u0939\u0940 \u0938\u094d\u0925\u093f\u0924\u0940 \u092e\u093e\u0928\u094d\u092f \u0915\u0930\u093e.<\/li>\n<li>\u092d\u0935\u093f\u0937\u094d\u092f\u093e\u0924\u0940\u0932 \u0924\u0941\u0932\u0928\u0947\u0938\u093e\u0920\u0940 \u092f\u093e\u091a\u0940 baseline \u092e\u094d\u0939\u0923\u0942\u0928 \u0928\u094b\u0902\u0926 \u0915\u0930\u093e.<\/li>\n<\/ul>\n<h3>air-gap \u0938\u092e\u0938\u094d\u092f\u093e\u0902\u0938\u093e\u0920\u0940<\/h3>\n<ul>\n<li>bearing \u091a\u0940 \u0938\u094d\u0925\u093f\u0924\u0940 \u0924\u092a\u093e\u0938\u093e \u0906\u0923\u093f \u091d\u0940\u091c \u0905\u0938\u0932\u094d\u092f\u093e\u0938 \u092c\u0926\u0932\u093e.<\/li>\n<li>rotor \u091a\u0940 axial position \u0924\u092a\u093e\u0938\u093e.<\/li>\n<li>frame distortion \u0915\u093f\u0902\u0935\u093e end-bell \u0938\u092e\u0938\u094d\u092f\u093e\u0902\u091a\u0940 \u0924\u092a\u093e\u0938\u0923\u0940 \u0915\u0930\u093e.<\/li>\n<li>\u091c\u093f\u0925\u0947 \u0936\u0915\u094d\u092f \u0906\u0939\u0947 \u0924\u093f\u0925\u0947 \u092a\u094d\u0930\u0924\u094d\u092f\u0915\u094d\u0937 air gap \u092e\u094b\u091c\u093e.<\/li>\n<\/ul>\n<p>Pole pass frequency is, in summary, a slip-related, motor-specific low-frequency component that opens a window onto rotor\u2013stator electromagnetic interaction and air-gap uniformity. Mastering its calculation, recognising its sideband signatures, and reading their amplitude trends lets an engineer diagnose electromagnetic faults with confidence \u2014 and direct maintenance effort to the right place instead of chasing a mechanical cause that was never there.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/mr\/glossary\/\">\u2190 \u092e\u0941\u0916\u094d\u092f \u0928\u093f\u0930\u094d\u0926\u0947\u0936\u0915\u093e\u0902\u0915\u0921\u0947 \u092a\u0930\u0924<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Learn about pole pass frequency (PPF), the vibration frequency generated by rotor interaction with stator poles, diagnostic for air gap eccentricity and electromagnetic issues in motors.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[114,109],"tags":[],"class_list":["post-197","glossary","type-glossary","status-publish","hentry","category-analysis","category-glossary"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/glossary\/197","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":2,"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/glossary\/197\/revisions"}],"predecessor-version":[{"id":102086,"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/glossary\/197\/revisions\/102086"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/media?parent=197"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/categories?post=197"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/tags?post=197"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}