{"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\/nb\/glossary\/pole-pass-frequency\/","title":{"rendered":"Hva er polpassfrekvens? Motorens elektromagnetiske krefter"},"content":{"rendered":"<h1>Forst\u00e5 polpassfrekvens<\/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\/nb\/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\/nb\/product\/balanset-1\/\" title=\"B\u00e6rbart balanseapparat og vibrasjonsanalysator 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 komplett sett med b\u00e6rbart balanseapparat og vibrasjonsanalysator\" 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\/nb\/product-category\/devices\/\" rel=\"tag\">Enheter<\/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\/nb\/product\/balanset-1\/\" title=\"B\u00e6rbart balanseapparat og vibrasjonsanalysator Balanset-1A\">B\u00e6rbart balanseapparat og vibrasjonsanalysator 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\">\u20ac<\/span>1,975.00<\/span> + MVA (hvis aktuelt)<\/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=\"\/nb\/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=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" 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=\"\/nb\/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=\"Legg i handlekurv: \u00abPortable balancer &amp; Vibration analyzer Balanset-1A\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abPortable balancer &amp; Vibration analyzer Balanset-1A\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/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\/nb\/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\/nb\/product\/vibration-sensor\/\" title=\"Vibrasjonssensor\">\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 vibrasjonssensor i n\u00e6rbilde\" 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\/nb\/product-category\/parts\/\" rel=\"tag\">Deler<\/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\/nb\/product\/vibration-sensor\/\" title=\"Vibrasjonssensor\">Vibrasjonssensor<\/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\">\u20ac<\/span>90.00<\/span> + MVA (hvis aktuelt)<\/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=\"\/nb\/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=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" 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=\"\/nb\/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=\"Legg i handlekurv: \u00abVibration sensor\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abVibration sensor\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/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\/nb\/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\/nb\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Optisk sensor (lasertakometer)\">\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=\"Optisk sensor (lasertakometer)\" 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\/nb\/product-category\/parts\/\" rel=\"tag\">Deler<\/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\/nb\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Optisk sensor (lasertakometer)\">Optisk sensor (lasertakometer)<\/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\">\u20ac<\/span>124.00<\/span> + MVA (hvis aktuelt)<\/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=\"\/nb\/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=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" 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=\"\/nb\/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=\"Legg i handlekurv: \u00abOptical Sensor (Laser Tachometer)\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abOptical Sensor (Laser Tachometer)\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/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\/nb\/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\/nb\/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 rotorbalanseringssett: b\u00e6reveske, flerkanals signalbehandler, h\u00e5ndholdt analysator, magnetisk base, vibrasjonssensorer og spiralkabler.\" 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\/nb\/product-category\/devices\/\" rel=\"tag\">Enheter<\/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\/nb\/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\">\u20ac<\/span>6,803.00<\/span> + MVA (hvis aktuelt)<\/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=\"\/nb\/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=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" 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=\"\/nb\/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=\"Legg i handlekurv: \u00abBalanset-4\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abBalanset-4\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/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\/nb\/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\/nb\/product\/magnet-stand\/\" title=\"Magnetisk stativ 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=\"Magnetisk 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\/nb\/product-category\/parts\/\" rel=\"tag\">Deler<\/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\/nb\/product\/magnet-stand\/\" title=\"Magnetisk stativ Insize-60-kgf\">Magnetisk stativ 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\">\u20ac<\/span>46.00<\/span> + MVA (hvis aktuelt)<\/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=\"\/nb\/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=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" 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=\"\/nb\/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=\"Legg i handlekurv: \u00abMagnetic Stand Insize-60-kgf\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abMagnetic Stand Insize-60-kgf\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/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\/nb\/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\/nb\/product\/reflective-tape\/\" title=\"Refleksb\u00e5nd\">\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=\"Refleksb\u00e5nd\" 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\/nb\/product-category\/parts\/\" rel=\"tag\">Deler<\/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\/nb\/product\/reflective-tape\/\" title=\"Refleksb\u00e5nd\">Refleksb\u00e5nd<\/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\">\u20ac<\/span>10.00<\/span> + MVA (hvis aktuelt)<\/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=\"\/nb\/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=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" 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=\"\/nb\/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=\"Legg i handlekurv: \u00abReflective tape\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abReflective tape\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/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\/nb\/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\/nb\/product\/dynamic-balancer-balanset-1a\/\" title=\"Dynamisk balanseringsapparat &quot;Balanset-1A&quot; 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-settet inneholder grensesnittenhet, sensorer, turteller og tilbeh\u00f8r\" 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\/nb\/product-category\/devices\/\" rel=\"tag\">Enheter<\/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\/nb\/product\/dynamic-balancer-balanset-1a\/\" title=\"Dynamisk balanseringsapparat &quot;Balanset-1A&quot; OEM\">Dynamisk balanseringsapparat \"Balanset-1A\" 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\">\u20ac<\/span>1,735.00<\/span> + MVA (hvis aktuelt)<\/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=\"\/nb\/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=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" 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=\"\/nb\/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=\"Legg i handlekurv: \u00abDynamic balancer \u201cBalanset-1A\u201d OEM\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abDynamic balancer \u201cBalanset-1A\u201d OEM\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/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>Polpassfrekvens<\/strong> (PPF) er den lavfrekvente <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/vibration\/\">vibrasjon<\/a> komponenten som genereres i en AC-induksjonsmotor n\u00e5r det roterende magnetfeltet glir forbi rotoren. Den beregnes som antall poler multiplisert med <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/slip-frequency\/\">slipfrekvens<\/a>: PPF = antall poler \u00d7 (synkronhastighet \u2212 faktisk hastighet) \/ 60. Fordi sluren er liten, er PPF en sv\u00e6rt lav frekvens \u2014 vanligvis bare noen f\u00e5 hertz \u2014 og den viser seg vanligvis ikke som en frittst\u00e5ende topp, men som <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/sidebands\/\">sideb\u00e5nd<\/a> med avstand lik PPF rundt komponentene ved rotasjonshastighet og nettfrekvens. Denne slurrelaterte modulasjonen forsterkes kraftig n\u00e5r motoren har <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/air-gap\/\">luftspalte<\/a> eksentrisitet, brutte rotorstaver eller et problem med rotor-til-stator-justering. Derfor er PPF et av de mest nyttige verkt\u00f8yene for \u00e5 skille <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/electrical-faults\/\">elektriske feil<\/a> fra rent mekaniske.<\/p>\n<p>PPF er diagnostisk viktig fordi forh\u00f8yede <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/sidebands\/\">sideb\u00e5nd<\/a> med avstand ved dette frekvenspunktet peker tydelig p\u00e5 et elektromagnetisk problem \u2014 en eksentrisk rotor, brutte rotorstaver, et ujevnt luftgap eller dynamisk rotor\u2013stator-interaksjon \u2014 snarere enn p\u00e5 <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/unbalance\/\">ubalanse<\/a> eller <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/misalignment\/\">feiljustering<\/a>. N\u00e5r den tolkes riktig, forteller den analytikeren om han skal \u00e5pne motoren eller se andre steder p\u00e5 toget.<\/p>\n<h2>1. Beregning av frekvensen for polpassering<\/h2>\n<h3>Grunnformelen<\/h3>\n<ul>\n<li><strong>PPF = P \u00d7 (N<sub>synkron<\/sub> \u2212 N) \/ 60<\/strong><\/li>\n<li>hvor <strong>P<\/strong> = antall poler,<\/li>\n<li><strong>N<sub>synkron<\/sub><\/strong> = synkronhastighet i RPM (N<sub>synkron<\/sub> = 120 \u00d7 nettfrekvens \/ P),<\/li>\n<li><strong>N<\/strong> = faktisk rotorhastighet i o\/min,<\/li>\n<li>og resultatet er i Hz. Uttrykket (N<sub>synkron<\/sub> \u2212 N) \/ 60 er slurefrekvensen uttrykt i Hz.<\/li>\n<\/ul>\n<p>Merk at PPF er bygget p\u00e5 <em>difference<\/em> mellom synkron og faktisk hastighet \u2014 <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/slip-frequency\/\">slipp<\/a>. Uten last g\u00e5r en induksjonsmotor nesten med synkron hastighet, s\u00e5 PPF n\u00e6rmer seg null; n\u00e5r lasten \u00f8ker, \u00f8ker slur og dermed PPF med den, og ender vanligvis opp i omr\u00e5det omtrent 0.5\u20133.5 Hz ved nominell last. Ikke forveksle PPF med den rent mekaniske ordenen P \u00d7 rotasjonshastighet (for en 4-polet motor ved 1750 RPM er det omtrent 116.7 Hz) \u2014 det er en harmonisk av akselrotasjonen, ikke polpasseringsfrekvensen. N\u00e5r du raskt m\u00e5 konvertere rotasjonshastighet til en familie av ordener, er v\u00e5r <a href=\"https:\/\/vibromera.eu\/nb\/calculators\/harmonic-frequency-calculator\/\">Harmonisk frekvenskalkulator<\/a> omregner RPM til Hz i st\u00f8rrelsesorden 1\u201310, og <a href=\"https:\/\/vibromera.eu\/nb\/calculators\/motor-electrical-frequencies\/\">Kalkulator for motorens elektriske defektfrekvens<\/a> viser de elektromagnetiske frekvensene side om side.<\/p>\n<h3>Gjennomarbeidede eksempler<\/h3>\n<p><strong>4-polet motor ved 1750 o\/min (60 Hz):<\/strong><\/p>\n<ul>\n<li>Synkronhastighet N<sub>synkron<\/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>I vibrasjons <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/spectrum\/\">spektrum<\/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>6-polet motor ved 970 o\/min (50 Hz):<\/strong><\/p>\n<ul>\n<li>Synkronhastighet N<sub>synkron<\/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>\u00c5 l\u00f8se dem krever n\u00f8ye, h\u00f8yoppl\u00f8selig <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/spectral-analysis\/\">spektralanalyse<\/a>.<\/li>\n<\/ul>\n<h2>2. Den fysiske mekanismen<\/h2>\n<h3>Hvordan den elektromagnetiske kraften oppst\u00e5r<\/h3>\n<p>Hendelsesforl\u00f8pet som f\u00f8rer til PPF er enkelt:<\/p>\n<ol>\n<li>Statorviklingene skaper et magnetfelt som roterer med synkronhastighet.<\/li>\n<li>Dette feltet er organisert i magnetiske poler i et N\u2013S\u2013N\u2013S-m\u00f8nster.<\/li>\n<li>Rotoren g\u00e5r litt langsommere p\u00e5 grunn av slur, s\u00e5 feltpolene driver kontinuerlig forbi rotoren i stedet for \u00e5 holde seg l\u00e5st til den.<\/li>\n<li>Hver gang en feltpol glir forbi et gitt punkt p\u00e5 rotoren (en stav med h\u00f8y motstand, en eksentrisk side av luftgapet), moduleres magnetkraften som virker p\u00e5 dette punktet.<\/li>\n<li>With <strong>P<\/strong> poler, passerer dette punktet <strong>P<\/strong> ganger per sluresyklus.<\/li>\n<li>Frekvensen til den resulterende modulasjonen er derfor P \u00d7 slurefrekvens = PPF \u2014 en langsom &#8220;slagtone&#8221; overlagret p\u00e5 vibrasjonen ved rotasjonshastighet og nettfrekvens.<\/li>\n<\/ol>\n<h3>Jevnt luftspalte \u2014 en velfungerende motor<\/h3>\n<ul>\n<li>Rotoren er sentrert i statorens hull.<\/li>\n<li>Luftspalten er jevn rundt hele omkretsen.<\/li>\n<li>Magnetkreftene er i likevekt og opphever hverandre.<\/li>\n<li>PPF-relatert modulasjon er derfor sv\u00e6rt lav i amplitude.<\/li>\n<\/ul>\n<h3>Eksentrisk luftspalte \u2014 en defekt motor<\/h3>\n<ul>\n<li>Rotoren sitter ikke sentrert i forhold til <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/bearing-wear\/\">slitasje p\u00e5 lager<\/a>, a <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/bent-shaft\/\">b\u00f8yd aksel<\/a>, eller en produksjonsfeil.<\/li>\n<li>Luftspalten er smalere p\u00e5 den ene siden og bredere p\u00e5 den andre.<\/li>\n<li>Magnetkreftene kommer i ubalanse \u2013 de er sterkere der avstanden er mindre.<\/li>\n<li>En netto radialkraft oppst\u00e5r \u2014 <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/magnetic-pull\/\">ubalansert magnetisk tiltrekning<\/a> \u2014 og den moduleres ved PPF n\u00e5r feltpolene glir forbi den smale siden av gapet.<\/li>\n<li>Sideb\u00e5nd med avstand lik PPF utvikler seg rundt de viktigste spektraltoppene og vokser med alvorlighetsgraden.<\/li>\n<\/ul>\n<h2>3. Sideb\u00e5nd og diagnostiske m\u00f8nstre<\/h2>\n<h3>Statisk eksentrisitet<\/h3>\n<p>Her er rotorsenteret forskj\u00f8vet, men st\u00e5r stille i forhold til statoren:<\/p>\n<ul>\n<li><strong>M\u00f8nster:<\/strong> en forh\u00f8yet 2\u00d7 nettfrekvenskomponent (100\/120 Hz); polpasseringssideb\u00e5nd er svake eller frav\u00e6rende fordi forskyvningen ikke roterer med akselen.<\/li>\n<li><strong>\u00c5rsak:<\/strong> lagerslitasje, deformasjon av ramme eller endeskjold, eller en maskineringsfeil i statorboringen.<\/li>\n<li><strong>Amplitude:<\/strong> amplituden ved 2\u00d7 nettfrekvens indikerer hvor alvorlig eksentrisiteten er.<\/li>\n<\/ul>\n<h3>Dynamisk eksentrisitet<\/h3>\n<p>Her kretser rotorens sentrum, eller snurrer, rundt statorens sentrum:<\/p>\n<ul>\n<li><strong>M\u00f8nster:<\/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>\u00c5rsaker:<\/strong> en b\u00f8yd aksel, rotor <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/rotor-eccentricity\/\">eksentrisitet<\/a>, rotor-til-stator <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/rotor-rub\/\">gni<\/a> or bearing <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/looseness\/\">l\u00f8shet<\/a>.<\/li>\n<li><strong>More severe:<\/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>Blandet eksentrisitet<\/h3>\n<ul>\n<li>En kombinasjon av statiske og dynamiske effekter.<\/li>\n<li>Dette er den vanligste tilstanden man finner i virkelige motorer.<\/li>\n<li>Det gir komplekse sideb\u00e5ndsm\u00f8nstre.<\/li>\n<li>Det kreves en grundig analyse for \u00e5 tolke det riktig.<\/li>\n<\/ul>\n<h2>4. Diagnostisk tolkning<\/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>Lav \u2014 polpasseringssideb\u00e5nd knapt synlige over st\u00f8ygulvet<\/h3>\n<ul>\n<li>En normal tilstand.<\/li>\n<li>Et jevnt luftspalte og god konsentrisitet mellom rotor og stator.<\/li>\n<li>Det er ikke n\u00f8dvendig med korrigerende tiltak.<\/li>\n<\/ul>\n<h3>Moderat \u2014 sideb\u00e5nd tydelig synlige, men langt under b\u00e6rertoppen<\/h3>\n<ul>\n<li>Svak ujevnhet i luftgapet eller tidlig degradering av rotorkretsen.<\/li>\n<li>F\u00f8lg med p\u00e5 utviklingen og sjekk tilstanden p\u00e5 lagrene.<\/li>\n<li>Kontroller rotorens posisjon hvis den er tilgjengelig.<\/li>\n<li>Det er ikke akutt kritisk, men det b\u00f8r tas p\u00e5 alvor.<\/li>\n<\/ul>\n<h3>H\u00f8y \u2014 sideb\u00e5nd som n\u00e6rmer seg b\u00e6rertoppen i amplitude<\/h3>\n<ul>\n<li>Betydelig eksentrisitet, brutte rotorstaver eller et luftgapproblem.<\/li>\n<li>En tydelig lavfrekvent &#8220;slagtone&#8221; kan f\u00f8les eller h\u00f8res ved PPF.<\/li>\n<li>Det er fare for kontakt mellom rotor og stator.<\/li>\n<li>\u00d8kende elektromagnetiske krefter som fremskynder skadene.<\/li>\n<li>Planlegg reparasjon eller utskifting.<\/li>\n<\/ul>\n<p>I praksis vurderer analytikeren sjelden PPF isolert. En b\u00e6rbar tokanalsanalysator som <a href=\"https:\/\/vibromera.eu\/nb\/produkt\/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\/nb\/glossary\/unbalance\/\">ubalanse<\/a> du kan rette ved \u00e5 <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/feltbalansering\/\">feltbalansering<\/a> rotoren p\u00e5 plass.<\/p>\n<h2>5. Forholdet til andre motoriske frekvenser<\/h2>\n<p>PPF er \u00e9n tone i et tettpakket motorspektrum, og \u00e5 kjenne igjen hvor den ligger i forhold til nabokomponentene, er halve jobben. Et typisk hierarki for en 4-polet motor med 1750 o\/min p\u00e5 60 Hz-nett er:<\/p>\n<ul>\n<li><strong>Glippfrekvens:<\/strong> (1800 \u2212 1750) \/ 60 \u2248 0.83 Hz.<\/li>\n<li><strong>PPF:<\/strong> P \u00d7 slurefrekvens \u2014 omtrent 3.3 Hz her, den laveste tonen i familien.<\/li>\n<li><strong><a href=\"https:\/\/vibromera.eu\/nb\/glossary\/running-speed\/\">Running speed<\/a> (1\u00d7):<\/strong> about 29.2 Hz.<\/li>\n<li><strong><a href=\"https:\/\/vibromera.eu\/nb\/glossary\/electrical-frequency\/\">Linjefrekvens<\/a>:<\/strong> 60 Hz (eller 50 Hz i Europa).<\/li>\n<li><strong>Rotorens mekaniske orden P \u00d7 rotasjonshastighet:<\/strong> omtrent 117 Hz \u2014 ofte forvekslet med PPF, men det er en harmonisk av akselhastigheten.<\/li>\n<li><strong>2\u00d7 nettfrekvens:<\/strong> 120 Hz (eller 100 Hz) \u2014 den viktigste elektromagnetiske komponenten for eksentrisitet.<\/li>\n<li><strong><a href=\"https:\/\/vibromera.eu\/nb\/glossary\/motor-bar-pass-frequency\/\">Frekvensen for rotorstangspassering<\/a>:<\/strong> antall rotorstaver \u00d7 rotasjonshastighet, oppe i kilohertzomr\u00e5det.<\/li>\n<\/ul>\n<p>Den tette avstanden mellom 2\u00d7 nettfrekvens (120 Hz) og den n\u00e6rliggende <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/harmonics\/\">harmoniske<\/a> av rotasjonshastigheten (4. orden ligger her p\u00e5 omtrent 117 Hz) er n\u00f8yaktig grunnen til at elektromagnetiske feil s\u00e5 lett forveksles med mekaniske \u2014 og hvorfor den fine polpasseringsstrukturen i sideb\u00e5ndene, ikke amplituden alene, er det avgj\u00f8rende sporet. Der bildet fortsatt er tvetydig, er det den definitive testen \u00e5 sl\u00e5 av str\u00f8mtilf\u00f8rselen: en elektromagnetisk komponent forsvinner umiddelbart med feltet, mens en mekanisk bare avtar n\u00e5r rotoren g\u00e5r ned i fart.<\/p>\n<h2>6. Korrigeringsmetoder<\/h2>\n<h3>For mekanisk eksentrisitet<\/h3>\n<ul>\n<li>Skift ut slitte lagre for \u00e5 gjenopprette riktig rotorsentrering<\/li>\n<li>Rett opp en b\u00f8yd aksel, eller skift ut rotoren.<\/li>\n<li>Monter rotoren p\u00e5 nytt hvis feilen skyldes en monteringsfeil.<\/li>\n<li>Kontroller at endehetten sitter rett og at boltene er strammet.<\/li>\n<\/ul>\n<h3>For produksjon av eksentriske deler<\/h3>\n<ul>\n<li>I alvorlige tilfeller kan det v\u00e6re n\u00f8dvendig \u00e5 bore opp rotoren eller statoren p\u00e5 nytt.<\/li>\n<li>Bytt ut motoren der det er \u00f8konomisk forsvarlig.<\/li>\n<li>Godta betingelsen dersom vibrasjonen holder seg innenfor akseptable grenser.<\/li>\n<li>Dokumenter dette som et utgangspunkt for fremtidige sammenligninger.<\/li>\n<\/ul>\n<h3>N\u00e5r det gjelder problemer med luftspalter<\/h3>\n<ul>\n<li>Kontroller lagerets tilstand og skift det ut hvis det er slitt.<\/li>\n<li>Kontroller rotorens aksiale posisjon.<\/li>\n<li>Kontroller om rammen er skjev eller om det er problemer med endehettene.<\/li>\n<li>M\u00e5l den faktiske luftspalten der det er tilgang til den.<\/li>\n<\/ul>\n<p>Polpasseringsfrekvens er kort oppsummert en slurrelatert, motorspesifikk lavfrekvent komponent som \u00e5pner et vindu inn til rotor\u2013stator-elektromagnetisk interaksjon og luftgapets jevnhet. \u00c5 beherske beregningen av den, gjenkjenne sideb\u00e5ndsignaturene dens og lese amplitudetrendene gj\u00f8r at en ingeni\u00f8r kan diagnostisere elektromagnetiske feil med trygghet \u2014 og styre vedlikeholdsinnsatsen til riktig sted i stedet for \u00e5 jage en mekanisk \u00e5rsak som aldri var der.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/nb\/glossary\/\">\u2190 Tilbake til hovedindeksen<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>L\u00e6r om polpassfrekvens (PPF), vibrasjonsfrekvensen som genereres av rotorens interaksjon med statorpoler, diagnostikk for luftgapseksentrisitet og elektromagnetiske problemer i motorer.<\/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\/nb\/wp-json\/wp\/v2\/glossary\/197","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":2,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/glossary\/197\/revisions"}],"predecessor-version":[{"id":102086,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/glossary\/197\/revisions\/102086"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/media?parent=197"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/categories?post=197"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/tags?post=197"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}