{"id":100156,"date":"2026-02-15T20:21:27","date_gmt":"2026-02-15T20:21:27","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100156"},"modified":"2026-07-12T20:50:58","modified_gmt":"2026-07-12T20:50:58","slug":"motor-efficiency-calculator","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/ja\/calculators\/motor-efficiency-calculator\/","title":{"rendered":"Motor Operating-Point Energy Comparison Worksheet"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Motor Operating-Point Energy Comparison Worksheet\",\"description\":\"Compare two documented motor efficiencies at the same shaft-output operating point and time segment without substituting IE class minimums for actual performance.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/motor-efficiency-calculator\/\",\"applicationCategory\":\"Engineering Reference\",\"operatingSystem\":\"Any\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"dateModified\":\"2026-07-12\",\"inLanguage\":\"en\",\"isAccessibleForFree\":true}<\/script>\n<style>:root{--me:#41662c;--mel:#edf5e8;--ink:#181817;--sec:#595750;--mut:#817e76;--b:#d8d4cc;--bl:#e9e5dd;--alt:#f8f6f1;--red:#b42318;--yel:#fff8df;--amb:#8a6500;--font:'DM Sans',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}.me-wrap{font-family:var(--font);color:var(--ink);max-width:1080px;margin:0 auto;border:1px solid var(--bl);border-radius:16px;overflow:hidden;background:#fff}.me-wrap *,.me-wrap *:before,.me-wrap *:after{box-sizing:border-box}.me-hero{padding:34px 38px 26px;background:linear-gradient(135deg,#fcfdfb,#edf5e8)}.me-kicker{text-transform:uppercase;letter-spacing:.1em;font-size:12px;font-weight:800;color:var(--me)}.me-hero h1{font-size:clamp(28px,4vw,44px);line-height:1.08;margin:8px 0 12px}.me-lead{font-size:17px;line-height:1.65;color:var(--sec);max-width:960px}.me-badges{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}.me-badge{padding:6px 10px;border-radius:99px;background:#fff;border:1px solid var(--b);font-size:12px;font-weight:700}.me-main{padding:30px 38px}.me-panel{border:1px solid var(--b);border-radius:14px;padding:24px}.me-panel h2{font-size:22px;margin:0 0 8px}.me-note{font-size:14px;line-height:1.55;color:var(--sec)}.me-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:20px}.me-field{display:flex;flex-direction:column;gap:7px}.me-wide{grid-column:1\/-1}.me-label{font-size:13px;font-weight:800}.me-input,.me-select,.me-textarea{width:100%;border:1px solid var(--b);border-radius:9px;background:#fff;color:var(--ink);font:inherit;padding:11px 12px}.me-input:focus,.me-select:focus,.me-textarea:focus{outline:3px solid #bed8ae;outline-offset:1px;border-color:var(--me)}.me-textarea{min-height:98px;resize:vertical}.me-help{font-size:12px;line-height:1.45;color:var(--mut)}.me-error{min-height:22px;margin:14px 0 0;color:var(--red);font-size:13px;font-weight:800}.me-results{margin-top:22px;border:1px solid var(--b);border-radius:12px;overflow:hidden}.me-rhead{background:var(--mel);padding:18px 20px}.me-rtitle{font-size:20px;font-weight:900;color:var(--me)}.me-rsub{font-size:13px;color:var(--sec);margin-top:4px}.me-rgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--bl)}.me-card{background:#fff;padding:18px}.me-card h3{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--mut);margin:0 0 8px}.me-val{font-size:20px;font-weight:900;overflow-wrap:anywhere}.me-unit{font-size:12px;color:var(--mut);margin-top:4px}.me-alert{border-left:4px solid var(--amb);background:var(--yel);padding:14px 16px;margin-top:18px;font-size:14px;line-height:1.55}.me-section{border-top:1px solid var(--bl);padding:28px 38px}.me-section h2{font-size:24px;margin:0 0 10px}.me-section h3{font-size:18px;margin:22px 0 8px}.me-section p,.me-section li{font-size:14px;line-height:1.65;color:var(--sec)}.me-table-wrap{overflow-x:auto;border:1px solid var(--b);border-radius:10px}.me-table{width:100%;border-collapse:collapse;min-width:780px}.me-table th,.me-table td{padding:12px 13px;text-align:left;vertical-align:top;border-bottom:1px solid var(--bl);font-size:13px;line-height:1.45}.me-table th{background:var(--alt);font-weight:900}.me-table tr:last-child td{border-bottom:0}.me-code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.me-footer{padding:20px 38px;background:var(--alt);font-size:12px;color:var(--mut)}.me-footer a,.me-section a{color:var(--me)}@media(max-width:700px){.me-hero,.me-main,.me-section{padding-left:20px;padding-right:20px}.me-grid,.me-rgrid{grid-template-columns:1fr}.me-wide{grid-column:auto}.me-panel{padding:18px}.me-table{min-width:700px}}<\/style>\n<div class=\"me-wrap\"><header class=\"me-hero\"><div class=\"me-kicker\">Same shaft output \u00b7 documented operating-point efficiency \u00b7 signed comparison<\/div><h1>Motor Operating-Point Energy Comparison Worksheet<\/h1><p class=\"me-lead\">Compare electrical input energy for two documented motor efficiencies at one common shaft-output operating point and time segment. IE class limits are not treated as the actual efficiency of a specific motor.<\/p><div class=\"me-badges\"><span class=\"me-badge\">Starts blank<\/span><span class=\"me-badge\">Actual operating point<\/span><span class=\"me-badge\">No embedded IE table<\/span><span class=\"me-badge\">No automatic recommendation<\/span><\/div><\/header>\n<main class=\"me-main\"><section class=\"me-panel\"><h2>Document one equal-output segment<\/h2><p class=\"me-note\">Both efficiencies must apply to the same delivered shaft power,load,supply,temperature and operating conditions. For a varying duty profile,evaluate every supported segment with its own output,efficiencies and hours,then sum the energies outside this worksheet.<\/p><form id=\"me-form\" novalidate><div class=\"me-grid\"><div class=\"me-field me-wide\"><label class=\"me-label\" for=\"me-basis\">Comparison basis<\/label><select class=\"me-select\" id=\"me-basis\"><option value=\"\">Select\u2026<\/option><option value=\"same-output\">Same shaft output and hours;efficiencies apply at this operating point<\/option><\/select><\/div><div class=\"me-field\"><label class=\"me-label\" for=\"me-output\">Delivered shaft output P<sub>out<\/sub> (kW)<\/label><input class=\"me-input\" id=\"me-output\" inputmode=\"decimal\" autocomplete=\"off\"><span class=\"me-help\">Actual mechanical output for this segment\u2014not automatically nameplate rating.<\/span><\/div><div class=\"me-field\"><label class=\"me-label\" for=\"me-hours\">Operating time h (hours)<\/label><input class=\"me-input\" id=\"me-hours\" inputmode=\"decimal\" autocomplete=\"off\"><span class=\"me-help\">Time spent at the stated output and efficiency.<\/span><\/div><div class=\"me-field\"><label class=\"me-label\" for=\"me-eff-a\">Current\/reference efficiency \u03b7<sub>A<\/sub> (%)<\/label><input class=\"me-input\" id=\"me-eff-a\" inputmode=\"decimal\" autocomplete=\"off\"><span class=\"me-help\">Documented efficiency at this exact operating point.<\/span><\/div><div class=\"me-field\"><label class=\"me-label\" for=\"me-eff-b\">Alternative efficiency \u03b7<sub>B<\/sub> (%)<\/label><input class=\"me-input\" id=\"me-eff-b\" inputmode=\"decimal\" autocomplete=\"off\"><span class=\"me-help\">Comparable efficiency on the same method and basis.<\/span><\/div><div class=\"me-field\"><label class=\"me-label\" for=\"me-price\">Energy price (cost units\/kWh)<\/label><input class=\"me-input\" id=\"me-price\" inputmode=\"decimal\" autocomplete=\"off\"><span class=\"me-help\">May be zero for an energy-only comparison;include all intended variable charges explicitly.<\/span><\/div><div class=\"me-field\"><label class=\"me-label\" for=\"me-currency\">Cost-unit label<\/label><input class=\"me-input\" id=\"me-currency\" maxlength=\"12\" autocomplete=\"off\" placeholder=\"e.g. EUR\"><span class=\"me-help\">A label only;no exchange-rate conversion.<\/span><\/div><div class=\"me-field me-wide\"><label class=\"me-label\" for=\"me-source\">Motor,test,load and source record<\/label><textarea class=\"me-textarea\" id=\"me-source\" maxlength=\"1800\" placeholder=\"Motor identities and revisions;shaft-output\/load basis;supply and speed;efficiency test or guaranteed data and edition;temperature\/altitude;hours source;price period and included charges;excluded drive,cable or process losses\"><\/textarea><\/div><\/div><p class=\"me-error\" id=\"me-error\" role=\"alert\"><\/p><\/form>\n<section class=\"me-results\" id=\"me-results\" hidden data-json=\"\"><div class=\"me-rhead\"><div class=\"me-rtitle\">Arithmetic comparison\u2014A minus B<\/div><div class=\"me-rsub\" id=\"me-summary\">\u2014<\/div><\/div><div class=\"me-rgrid\"><article class=\"me-card\"><h3>Input power A<\/h3><div class=\"me-val\" id=\"me-r-pin-a\">\u2014<\/div><div class=\"me-unit\" id=\"me-r-loss-a\">\u2014<\/div><\/article><article class=\"me-card\"><h3>Input power B<\/h3><div class=\"me-val\" id=\"me-r-pin-b\">\u2014<\/div><div class=\"me-unit\" id=\"me-r-loss-b\">\u2014<\/div><\/article><article class=\"me-card\"><h3>Electrical energy A<\/h3><div class=\"me-val\" id=\"me-r-energy-a\">\u2014<\/div><div class=\"me-unit\" id=\"me-r-cost-a\">\u2014<\/div><\/article><article class=\"me-card\"><h3>Electrical energy B<\/h3><div class=\"me-val\" id=\"me-r-energy-b\">\u2014<\/div><div class=\"me-unit\" id=\"me-r-cost-b\">\u2014<\/div><\/article><article class=\"me-card\"><h3>Energy difference A\u2212B<\/h3><div class=\"me-val\" id=\"me-r-delta-e\">\u2014<\/div><div class=\"me-unit\">positive means B uses less input energy for this modelled segment<\/div><\/article><article class=\"me-card\"><h3>Cost difference A\u2212B<\/h3><div class=\"me-val\" id=\"me-r-delta-cost\">\u2014<\/div><div class=\"me-unit\">signed arithmetic;not payback or a purchasing recommendation<\/div><\/article><article class=\"me-card\"><h3>Loss energy A<\/h3><div class=\"me-val\" id=\"me-r-loss-energy-a\">\u2014<\/div><div class=\"me-unit\">input minus delivered shaft energy<\/div><\/article><article class=\"me-card\"><h3>Loss energy B<\/h3><div class=\"me-val\" id=\"me-r-loss-energy-b\">\u2014<\/div><div class=\"me-unit\">motor-only model at the entered efficiency<\/div><\/article><article class=\"me-card\"><h3>Delivered shaft energy<\/h3><div class=\"me-val\" id=\"me-r-output-energy\">\u2014<\/div><div class=\"me-unit\">identical for A and B by the selected basis<\/div><\/article><\/div><\/section>\n<div class=\"me-alert\"><strong>Decision boundary:<\/strong> an IE class limit is a classification threshold under the standard&#8217;s rating and test scope,not the measured efficiency of every motor at every load. This worksheet does not include part-load curves,starts,stops,standby,converter,cable,filter,transmission,process or demand-charge effects and does not establish regulatory compliance,life-cycle cost or payback.<\/div><\/section><\/main>\n<section class=\"me-section\"><h2>Equations implemented<\/h2><div class=\"me-table-wrap\"><table class=\"me-table\"><thead><tr><th>Quantity<\/th><th>Equation<\/th><th>Unit\/boundary<\/th><\/tr><\/thead><tbody><tr><td>efficiency fraction<\/td><td class=\"me-code\">\u03b7=\u03b7%\/100<\/td><td>0&lt;\u03b7\u22641;both values apply at the stated operating point.<\/td><\/tr><tr><td>electrical input power<\/td><td class=\"me-code\">P<sub>in<\/sub>=P<sub>out<\/sub>\/\u03b7<\/td><td>kW;motor terminals on the documented test basis.<\/td><\/tr><tr><td>input energy<\/td><td class=\"me-code\">E<sub>in<\/sub>=P<sub>in<\/sub>h<\/td><td>kWh for one constant segment.<\/td><\/tr><tr><td>motor loss energy<\/td><td class=\"me-code\">E<sub>loss<\/sub>=(P<sub>in<\/sub>\u2212P<sub>out<\/sub>)h<\/td><td>kWh;does not include external drive\/system losses.<\/td><\/tr><tr><td>signed difference<\/td><td class=\"me-code\">\u0394E=E<sub>A<\/sub>\u2212E<sub>B<\/sub><\/td><td>Positive only when B uses less input energy under equal output\/hours.<\/td><\/tr><tr><td>cost difference<\/td><td class=\"me-code\">\u0394K=\u0394E\u00b7k<\/td><td>Entered cost units;no fixed currency or FX conversion.<\/td><\/tr><\/tbody><\/table><\/div><\/section>\n<section class=\"me-section\"><h2>Current IEC scope<\/h2><p><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/91195\" target=\"_blank\" rel=\"noopener\">IEC60034-30-1:2025,Edition2<\/a> is the current standard for IE efficiency classes of line-operated,single-speed AC motors rated for sinusoidal50Hz or60Hz supply. Its public scope includes0.12kW to1000kW,50V through1000V,2\/4\/6\/8 poles and specified continuous-operation,ambient and altitude conditions. It excludes power-drive-system efficiency and losses from supply harmonics,cables,filters and frequency converters.<\/p><p>The2025 edition replaced IEC60034-30-1:2014,introduced IE5 limits,new IE5 tables and revised interpolation coefficients. The former page continued to calculate from2014 tables,derived its own IE5 values and linearly interpolated efficiency percentages. Those are not valid substitutes for the current closed tables or interpolation rules.<\/p><p><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/67756\" target=\"_blank\" rel=\"noopener\">IEC60034-2-1:2024,Edition3<\/a> is current and establishes test methods for determining losses and efficiency of mains-operated rotating machines. A class threshold or catalogue label cannot replace the actual efficiency,test basis and operating-point evidence required by this arithmetic comparison.<\/p><p><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/30830\" target=\"_blank\" rel=\"noopener\">IEC TS60034-30-2:2016<\/a> separately addresses efficiency classes for variable-speed AC motors not covered by Part30-1. Its public introduction states that application selection depends on actual load\/speed operating points and operating time,and that an efficient motor alone does not necessarily produce an efficient power-drive system.<\/p><p>Exact IE tables,interpolation coefficients,tolerances,test-method selection and regulatory mappings remain <strong>NEEDS_LICENSED_SOURCE<\/strong>. They are intentionally not reproduced or inferred by this worksheet.<\/p><\/section>\n<section class=\"me-section\"><h2>What was corrected<\/h2><p>The former calculator treated IE minimum limits as actual motor efficiency,assumed rated output was delivered continuously,used linear interpolation between closed table rows,clamped every rating below0.75kW or above200kW to an endpoint,and used a derived \u201c20% lower losses\u201d IE5 table after normative IE5 values had been published.<\/p><p>The replacement removes all embedded IE tables,class selectors,pole-speed approximations,presets,defaults,URL\/history persistence,hard-coded euros and unsourced1\u20134-year payback and legal-compliance claims. It accepts only documented efficiencies applicable to the same shaft-output segment and reports a signed comparison without recommending an alternative.<\/p><\/section>\n<section class=\"me-section\"><h2>Evidence required for use<\/h2><ul><li>Use efficiency values obtained or guaranteed on a comparable IEC60034-2-1 or other controlled test basis at the relevant load,supply,speed and temperature.<\/li><li>Do not use nameplate IE class alone as \u03b7. A motor may exceed its class minimum,and part-load efficiency differs from rated-load efficiency.<\/li><li>For variable load\/speed,build a segment or time-series model using the applicable efficiency map and include converter and driven-system losses within the chosen boundary.<\/li><li>For an investment decision,add installed cost,maintenance,downtime,service life,discounting,tax and uncertainty in a separate documented life-cycle model.<\/li><\/ul><\/section>\n<footer class=\"me-footer\">\u00a92024\u20132026 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a> \u00b7 Scientific review July2026<\/footer><\/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 fmt(n){if(n===0)return'0';var 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