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Why Motor rated in kW instead of kVA?

Why Motor rated in kW instead of kVA

Why Motor rated in kW instead of kVA?

Why Motor rated in kW/Horsepower instead of kVA?

We know that Transformer rating may be expressed in kVA as well as Generator and Alternator rated in kVA Designer doesn’t know the actual consumer power factor while manufacturing transformers and generators i.e. the P.F (Power factor) of Transformer and Generator/Alternator depends on the nature of connected load such as resistive load, capacitive load, and inductive load as Motors, etc. But Motorhas fixed Power factor, i.e. motor has defined power factor and the rating has been mentioned in KW on Motor nameplate data table. That’s why we are rated Motor in kW or HP (kilowatts/ Horsepower) instead of kVA.

In addition, Motor is a device which converts Electrical power into Mechanical power. In this case, the load is not electrical, but mechanical (Motor’s Output) and we take into the account only active power which has to be converted into mechanical load. Moreover, the motor power factor does not depend on the load and it works on any P.F because of its design.
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18 comments

  1. Glad to have found your site. Keep up the good work!

    • There is a AC synchronous generator with cosθ = 0.85 supply for a AC asynchronous motor with cosθ = 0.92
      Could you explain for me the different between two power factors.
      Thanks so much !

  2. Thanks for such an informative post. The difference between kW and kVA is not known to most of the people.

  3. How do you calculate the size compasitor needed on any motor

  4. It was great thank you very much

  5. There is a AC synchronous generator with cosθ = 0.85 supply for a AC asynchronous motor with cosθ = 0.92
    Could you explain for me the different between two power factors.
    Thanks so much !

  6. Amreek. Sing Rajiana

    No . Motor power factor depends upon the load. Increasing the load increasing the power factor. So a induction motor should always be pit on maximum load. If we have only induction motor loads in a factory then we we use capacitor bank

  7. if exitation are falling how to make new it

  8. biswajit halder

    it is very good said for all eng student

  9. Its interesting while reading the informations. but answers are not clear in many topics. many of the answers are specified with some reasons. There wont be any explanation for those reasons. At the time, we get struck to believe the answers which are specified is really a correct. so please explain the reason along with the answer. then only the reader get to understand it clearly. just i expressed my suggestion. 🙂

  10. Kw
    KV a
    Kvar
    Kwh

  11. Is there really 1 ton ac consume 3.516 kw power ?

  12. If we have three phase and neutral supply and we get deferent voltage between each phase and neutral. I want to know that how can we get equal voltage in between each phase and neutral.

  13. The in formation provided clears the doubts and makes the concept very clear of an interested reader.

  14. Its really good and had gain knowlage from it
    thank a lot

  15. it is really interview based questtion

  16. excellent answer..im rly satisfied

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