Three-Phase Induction-Motor Nameplate Consistency Worksheet
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.
Transcribe one controlled rating
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 Δ/Y or dual-frequency rows.
Синхронна швидкість
Rated slip
Shaft torque
Apparent power
Active input power
Derived efficiency
Derived motor loss
Declared η difference
Connection record
Equations,units and applicability
| Кількість | Equation | Межа |
|---|---|---|
| Синхронна швидкість | nₛ=120f/P об/хв | Rotating-field speed from frequency and even pole count. |
| Ковзання | s=(nₛ−n)/nₛ | Induction motor in motoring operation;this worksheet requires0<s<1. |
| Shaft torque | T=Pout·1000/[2π(n/60)] Н·м | Mean torque corresponding to the entered mechanical output and speed. |
| Three-phase apparent power | S=√3 ULL IL/1000 kVA | Balanced three-phase RMS line quantities. |
| Active input and efficiency | Pin=λS;η=Pout/Pin | Same sinusoidal rating;λ is power factor,not a guessed IE-class value. |
These are general electrical and mechanical relations derived from definitions. They are not a normative “IEC nameplate decoder,”not an IEC efficiency test method and not a substitute for the tolerances and test procedures in the licensed standards.
Which standard owns each marking?
| Field | Current source route | Worksheet treatment |
|---|---|---|
| Rating,duty,performance,thermal limits and marking | IEC60034-1:2026,Edition15;replaces2022 | Record verbatim;exact requirements are NEEDS_LICENSED_SOURCE. |
| Mains-operated efficiency/loss test | IEC60034-2-1:2024,Edition3 | No compliance/test-method claim from plate arithmetic. |
| Converter-fed motor efficiency/loss | IEC60034-2-3:2024,Edition2 | Outside this sinusoidal worksheet. |
| IE efficiency class | IEC60034-30-1:2025,Edition2 | Record exact marking;class minimum is not actual η and no table is reproduced. |
| Motor enclosure IP code | IEC60034-5:2020,Edition5 + COR1:2024;general enclosure route IEC60529 Ed2.2 | Record full code and product scope;no partial menu decoding. |
| Cooling IC code | IEC60034-6:1991,Edition2;stability2028 | Record complete or simplified designation verbatim. |
| Construction/mounting IM code | IEC60034-7:2020,Edition3 + COR:2023 | Record whether Code I or Code II;no inferred mounting. |
| Terminal markings/rotation | IEC60034-8:2026,Edition4 | Use the actual diagram/documentation;no automatic Δ/Y instruction. |
| Frame dimensions | IEC60072-1:2022,Edition7 where applicable | Ні parseInt(frame) shaft-height inference for arbitrary systems. |
| Thermal class | IEC60085:2007,Edition4 plus machine requirements | No universal ambient+rise+hotspot table without the applicable method and conditions. |
Interpretation safeguards
- Never combine voltage from one Δ/Y row with current,power factor or efficiency from another row.
- IE1–IE5 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.
- Duty types S1–S10 require the full current definitions,cycle quantities and rating context. “S1” is not simply permission for unlimited operation under any ambient,load or cooling condition.
- An IP code states a tested enclosure protection classification inside its scope;it is not a corrosion,condensation,explosion,chemical or outdoor-suitability decision.
- A leading frame number may correspond to shaft height only when the declared dimensional system and exact designation make that mapping applicable.
- For distorted,unbalanced,converter-fed,multi-speed,synchronous,DC,generator or non-IEC machines,use the applicable model and standards instead of this worksheet.
Що було виправлено
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 “full-load” conclusions.
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.
