{"id":100159,"date":"2026-02-15T20:21:38","date_gmt":"2026-02-15T20:21:38","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100159"},"modified":"2026-07-12T21:23:40","modified_gmt":"2026-07-12T21:23:40","slug":"motor-nameplate-decoder","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/ka\/calculators\/motor-nameplate-decoder\/","title":{"rendered":"Three-Phase Induction-Motor Nameplate Consistency Worksheet"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Three-Phase Induction-Motor Nameplate Consistency Worksheet\",\"description\":\"Cross-check one documented sinusoidal three-phase induction-motor rated point without inventing missing IEC nameplate data or decoding unsupported codes.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/motor-nameplate-decoder\/\",\"applicationCategory\":\"Engineering 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print{.np-wrap{max-width:none}.np-hero,.np-panel,.np-section{box-shadow:none}}\n<\/style>\n<div class=\"np-wrap\">\n<header class=\"np-hero\"><div class=\"np-kicker\">Exact plate transcription \u00b7 one rating\/configuration \u00b7 arithmetic consistency only<\/div><h1>Three-Phase Induction-Motor Nameplate Consistency Worksheet<\/h1><p class=\"np-lead\">Cross-check one balanced sinusoidal three-phase induction-motor rated point. The worksheet does not claim to decode every motor plate and does not invent duty,thermal,IP,IC,IM,frame,terminal or IE meanings from a partial drop-down list.<\/p><div class=\"np-badges\"><span class=\"np-badge\">Starts blank<\/span><span class=\"np-badge\">Same rating pair required<\/span><span class=\"np-badge\">Current IEC editions<\/span><span class=\"np-badge\">No automatic compliance decision<\/span><\/div><\/header>\n<main class=\"np-main\"><section class=\"np-panel\"><h2>Transcribe one controlled rating<\/h2><p class=\"np-note\">Use line-to-line RMS voltage,line RMS current,output power,power factor,frequency and speed that belong to the same connection and rating. Do not combine \u0394\/Y or dual-frequency rows.<\/p><form id=\"np-form\" novalidate><div class=\"np-grid\">\n<div class=\"np-field np-wide\"><label class=\"np-label\" for=\"np-basis\">Calculation basis<\/label><select class=\"np-select\" id=\"np-basis\"><option value=\"\">Select\u2026<\/option><option value=\"rated-three-phase-induction-sinusoidal\">Rated motoring point;balanced three-phase sinusoidal supply;same plate row<\/option><\/select><\/div>\n<div class=\"np-field\"><label class=\"np-label\" for=\"np-pout\">Rated shaft output P<sub>out<\/sub> (kW)<\/label><input class=\"np-input\" id=\"np-pout\" inputmode=\"decimal\" autocomplete=\"off\"><span class=\"np-help\">Mechanical output power\u2014not electrical input.<\/span><\/div>\n<div class=\"np-field\"><label class=\"np-label\" for=\"np-voltage\">Line-to-line RMS voltage U<sub>LL<\/sub> (V)<\/label><input class=\"np-input\" id=\"np-voltage\" inputmode=\"decimal\" autocomplete=\"off\"><span class=\"np-help\">From the selected connection\/rating row.<\/span><\/div>\n<div class=\"np-field\"><label class=\"np-label\" for=\"np-current\">Line RMS current I<sub>L<\/sub> (A)<\/label><input class=\"np-input\" id=\"np-current\" inputmode=\"decimal\" autocomplete=\"off\"><span class=\"np-help\">Same row and operating rating as U<sub>LL<\/sub>.<\/span><\/div>\n<div class=\"np-field\"><label class=\"np-label\" for=\"np-frequency\">Supply frequency f (Hz)<\/label><input class=\"np-input\" id=\"np-frequency\" inputmode=\"decimal\" autocomplete=\"off\"><\/div>\n<div class=\"np-field\"><label class=\"np-label\" for=\"np-poles\">Pole count P<\/label><input class=\"np-input\" id=\"np-poles\" inputmode=\"numeric\" autocomplete=\"off\"><span class=\"np-help\">Positive even whole number from controlled evidence.<\/span><\/div>\n<div class=\"np-field\"><label class=\"np-label\" for=\"np-rpm\">Rated rotor speed n (r\/min)<\/label><input class=\"np-input\" id=\"np-rpm\" inputmode=\"decimal\" autocomplete=\"off\"><span class=\"np-help\">Induction-motor motoring speed below synchronous speed.<\/span><\/div>\n<div class=\"np-field\"><label class=\"np-label\" for=\"np-pf\">Power factor \u03bb=P<sub>in<\/sub>\/S<\/label><input class=\"np-input\" id=\"np-pf\" inputmode=\"decimal\" autocomplete=\"off\"><span class=\"np-help\">Ratio0\u20131 for this same sinusoidal rated state.<\/span><\/div>\n<div class=\"np-field\"><label class=\"np-label\" for=\"np-eta\">Declared efficiency \u03b7 (optional ratio0\u20131)<\/label><input class=\"np-input\" id=\"np-eta\" inputmode=\"decimal\" autocomplete=\"off\"><span class=\"np-help\">Leave blank unless explicitly stated for this rating.<\/span><\/div>\n<div class=\"np-field\"><label class=\"np-label\" for=\"np-config\">Connection\/rating identifier<\/label><input class=\"np-input\" id=\"np-config\" autocomplete=\"off\" maxlength=\"240\" placeholder=\"Exact row,e.g. \u0394400 V \/ 22 A \/ 50 Hz\"><span class=\"np-help\">Preserve symbols and paired values verbatim.<\/span><\/div>\n<div class=\"np-field np-wide\"><label class=\"np-label\" for=\"np-source\">Exact plate and source record<\/label><textarea class=\"np-textarea\" id=\"np-source\" maxlength=\"2400\" placeholder=\"Manufacturer,type\/serial;verbatim plate lines;photo\/document ID and date;connection;duty;ambient\/altitude;IP,IC,IM,thermal\/frame\/IE markings;applicable standard editions;measurement or certificate sources\"><\/textarea><\/div>\n<\/div><p class=\"np-error\" id=\"np-error\" role=\"alert\"><\/p><\/form>\n<section class=\"np-results\" id=\"np-results\" hidden data-json=\"\"><div class=\"np-rhead\"><div class=\"np-rtitle\">Consistency results<\/div><div class=\"np-rsub\" id=\"np-summary\">\u2014<\/div><\/div><div class=\"np-rgrid\">\n<article class=\"np-card\"><h3>Synchronous speed<\/h3><div class=\"np-val\" id=\"np-r-ns\">\u2014<\/div><div class=\"np-unit\">n<sub>s<\/sub>=120f\/P<\/div><\/article>\n<article class=\"np-card\"><h3>Rated slip<\/h3><div class=\"np-val\" id=\"np-r-slip\">\u2014<\/div><div class=\"np-unit\" id=\"np-r-slipratio\">\u2014<\/div><\/article>\n<article class=\"np-card\"><h3>Shaft torque<\/h3><div class=\"np-val\" id=\"np-r-torque\">\u2014<\/div><div class=\"np-unit\">P<sub>out<\/sub>\/\u03c9;exact2\u03c0 conversion<\/div><\/article>\n<article class=\"np-card\"><h3>Apparent power<\/h3><div class=\"np-val\" id=\"np-r-s\">\u2014<\/div><div class=\"np-unit\">S=\u221a3 U<sub>LL<\/sub>I<sub>L<\/sub><\/div><\/article>\n<article class=\"np-card\"><h3>Active input power<\/h3><div class=\"np-val\" id=\"np-r-pin\">\u2014<\/div><div class=\"np-unit\">P<sub>in<\/sub>=\u03bbS<\/div><\/article>\n<article class=\"np-card\"><h3>Derived efficiency<\/h3><div class=\"np-val\" id=\"np-r-eff\">\u2014<\/div><div class=\"np-unit\">\u03b7=P<sub>out<\/sub>\/P<sub>in<\/sub><\/div><\/article>\n<article class=\"np-card\"><h3>Derived motor loss<\/h3><div class=\"np-val\" id=\"np-r-loss\">\u2014<\/div><div class=\"np-unit\">P<sub>in<\/sub>\u2212P<sub>out<\/sub><\/div><\/article>\n<article class=\"np-card\"><h3>Declared \u03b7 difference<\/h3><div class=\"np-val\" id=\"np-r-delta\">\u2014<\/div><div class=\"np-unit\">derived minus declared;percentage points<\/div><\/article>\n<article class=\"np-card\"><h3>Connection record<\/h3><div class=\"np-val\" id=\"np-r-config\">\u2014<\/div><div class=\"np-unit\">verbatim user evidence;not decoded<\/div><\/article>\n<\/div><\/section>\n<div class=\"np-alert\"><strong>Decision boundary:<\/strong> arithmetic agreement does not prove IEC conformity or identify the correct wiring,duty,temperature rise,IP test,IE class,frame dimensions,starting capability or safe application. Resolve discrepancies against the manufacturer documentation and the licensed standards applicable to the exact machine.<\/div><\/section><\/main>\n<section class=\"np-section\"><h2>Equations,units and applicability<\/h2><table class=\"np-table\"><thead><tr><th>Quantity<\/th><th>Equation<\/th><th>Boundary<\/th><\/tr><\/thead><tbody><tr><td>Synchronous speed<\/td><td><span class=\"np-code\">n\u209b=120f\/P<\/span> r\/min<\/td><td>Rotating-field speed from frequency and even pole count.<\/td><\/tr><tr><td>Slip<\/td><td><span class=\"np-code\">s=(n\u209b\u2212n)\/n\u209b<\/span><\/td><td>Induction motor in motoring operation;this worksheet requires0&lt;s&lt;1.<\/td><\/tr><tr><td>Shaft torque<\/td><td><span class=\"np-code\">T=Pout\u00b71000\/[2\u03c0(n\/60)]<\/span> N\u00b7m<\/td><td>Mean torque corresponding to the entered mechanical output and speed.<\/td><\/tr><tr><td>Three-phase apparent power<\/td><td><span class=\"np-code\">S=\u221a3 ULL IL\/1000<\/span> kVA<\/td><td>Balanced three-phase RMS line quantities.<\/td><\/tr><tr><td>Active input and efficiency<\/td><td><span class=\"np-code\">Pin=\u03bbS;\u03b7=Pout\/Pin<\/span><\/td><td>Same sinusoidal rating;\u03bb is power factor,not a guessed IE-class value.<\/td><\/tr><\/tbody><\/table><p>These are general electrical and mechanical relations derived from definitions. They are not a normative \u201cIEC nameplate decoder,\u201dnot an IEC efficiency test method and not a substitute for the tolerances and test procedures in the licensed standards.<\/p><\/section>\n<section class=\"np-section\"><h2>Which standard owns each marking?<\/h2><table class=\"np-table\"><thead><tr><th>Field<\/th><th>Current source route<\/th><th>Worksheet treatment<\/th><\/tr><\/thead><tbody>\n<tr><td>Rating,duty,performance,thermal limits and marking<\/td><td><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/89961\" target=\"_blank\" rel=\"noopener\">IEC60034-1:2026,Edition15<\/a>;replaces2022<\/td><td>Record verbatim;exact requirements are <span class=\"np-code\">NEEDS_LICENSED_SOURCE<\/span>.<\/td><\/tr>\n<tr><td>Mains-operated efficiency\/loss test<\/td><td><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/67756\" target=\"_blank\" rel=\"noopener\">IEC60034-2-1:2024,Edition3<\/a><\/td><td>No compliance\/test-method claim from plate arithmetic.<\/td><\/tr>\n<tr><td>Converter-fed motor efficiency\/loss<\/td><td><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/67758\" target=\"_blank\" rel=\"noopener\">IEC60034-2-3:2024,Edition2<\/a><\/td><td>Outside this sinusoidal worksheet.<\/td><\/tr>\n<tr><td>IE efficiency class<\/td><td><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/91195\" target=\"_blank\" rel=\"noopener\">IEC60034-30-1:2025,Edition2<\/a><\/td><td>Record exact marking;class minimum is not actual \u03b7 and no table is reproduced.<\/td><\/tr>\n<tr><td>Motor enclosure IP code<\/td><td><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/64224\" target=\"_blank\" rel=\"noopener\">IEC60034-5:2020,Edition5 + COR1:2024<\/a>;general enclosure route <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/2452\" target=\"_blank\" rel=\"noopener\">IEC60529 Ed2.2<\/a><\/td><td>Record full code and product scope;no partial menu decoding.<\/td><\/tr>\n<tr><td>Cooling IC code<\/td><td><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/143\" target=\"_blank\" rel=\"noopener\">IEC60034-6:1991,Edition2<\/a>;stability2028<\/td><td>Record complete or simplified designation verbatim.<\/td><\/tr>\n<tr><td>Construction\/mounting IM code<\/td><td><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/64225\" target=\"_blank\" rel=\"noopener\">IEC60034-7:2020,Edition3 + COR:2023<\/a><\/td><td>Record whether Code I or Code II;no inferred mounting.<\/td><\/tr>\n<tr><td>Terminal markings\/rotation<\/td><td><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/113926\" target=\"_blank\" rel=\"noopener\">IEC60034-8:2026,Edition4<\/a><\/td><td>Use the actual diagram\/documentation;no automatic \u0394\/Y instruction.<\/td><\/tr>\n<tr><td>Frame dimensions<\/td><td><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/67088\" target=\"_blank\" rel=\"noopener\">IEC60072-1:2022,Edition7<\/a> where applicable<\/td><td>No <span class=\"np-code\">parseInt(frame)<\/span> shaft-height inference for arbitrary systems.<\/td><\/tr>\n<tr><td>Thermal class<\/td><td><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/666\" target=\"_blank\" rel=\"noopener\">IEC60085:2007,Edition4<\/a> plus machine requirements<\/td><td>No universal ambient+rise+hotspot table without the applicable method and conditions.<\/td><\/tr>\n<\/tbody><\/table><\/section>\n<section class=\"np-section\"><h2>Interpretation safeguards<\/h2><ul><li>Never combine voltage from one \u0394\/Y row with current,power factor or efficiency from another row.<\/li><li>IE1\u2013IE5 are class limits inside a defined scope;they are not measured or guaranteed operating-point efficiency values. IEC60034-30-1:2025 replaced the2014 edition and introduced normative IE5 limits.<\/li><li>Duty types S1\u2013S10 require the full current definitions,cycle quantities and rating context. \u201cS1\u201d is not simply permission for unlimited operation under any ambient,load or cooling condition.<\/li><li>An IP code states a tested enclosure protection classification inside its scope;it is not a corrosion,condensation,explosion,chemical or outdoor-suitability decision.<\/li><li>A leading frame number may correspond to shaft height only when the declared dimensional system and exact designation make that mapping applicable.<\/li><li>For distorted,unbalanced,converter-fed,multi-speed,synchronous,DC,generator or non-IEC machines,use the applicable model and standards instead of this worksheet.<\/li><\/ul><\/section>\n<section class=\"np-section\"><h2>What was corrected<\/h2><p>The former page claimed to read any motor plate but always used a balanced three-phase formula,preselected a complete fictitious plate and accepted malformed or physically inconsistent values. It could display negative slip,efficiency above100%,NaN reactive power and unqualified \u201cfull-load\u201d conclusions.<\/p><p>The former decoder echoed user-selected S\/IP\/IE\/thermal labels as authoritative meanings,reproduced an outdated2014 IE table with an indicative IE5 value,and treated the leading digits of any frame string as shaft height. Those tables and automatic decoders were removed. The replacement requires exact evidence,checks only one explicit physical model,uses strict parsing and does not infer closed-standard content.<\/p><\/section>\n<\/div>\n<script>(function(){'use strict';function $(id){return document.getElementById(id)}function num(s){s=String(s).trim();if(!s||s.includes('.')&&s.includes(',')||!\/^[+-]?(?:\\d+(?:[.,]\\d*)?|[.,]\\d+)(?:[eE][+-]?\\d+)?$\/.test(s))return NaN;var n=Number(s.replace(',','.'));return Number.isFinite(n)&&Math.abs(n)<=1e100?n:NaN}function integer(s){s=String(s).trim();return\/^\\+?\\d+$\/.test(s)?Number(s):NaN}function fmt(n){if(n===0)return'0';var a=Math.abs(n);return a>=1e12||a<1e-8?n.toExponential(9):Number(n.toPrecision(12)).toLocaleString('en-US',{maximumFractionDigits:20})}function 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omega=2*Math.PI*rpm\/60,torque=pout*1000\/omega,apparent=Math.sqrt(3)*voltage*current\/1000,pin=apparent*pf,eff=pout\/pin,loss=pin-pout,delta=declared===null?null:(eff-declared)*100;if(![ns,slip,omega,torque,apparent,pin,eff,loss].every(Number.isFinite)||delta!==null&&!Number.isFinite(delta)){fail('The result exceeds the supported numerical range.');return}if(!(eff>0&&eff<=1&&loss>=0)){fail('These same-row inputs imply efficiency outside(0,1] or negative motor loss;resolve the plate\/configuration evidence before interpretation.');return}$('np-error').textContent='';$('np-r-ns').textContent=fmt(ns)+' r\/min';$('np-r-slip').textContent=fmt(slip*100)+' %';$('np-r-slipratio').textContent='s = '+fmt(slip)+';difference '+fmt(ns-rpm)+' r\/min';$('np-r-torque').textContent=fmt(torque)+' N\u00b7m';$('np-r-s').textContent=fmt(apparent)+' kVA';$('np-r-pin').textContent=fmt(pin)+' kW';$('np-r-eff').textContent=fmt(eff*100)+' %';$('np-r-loss').textContent=fmt(loss)+' 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