Answer / k.prakashchandra

By varying the voltage .The speed controller connects
resistance in series with the supply and hence the voltage
to the motor is reduced.This type speed control goes well
with the fan as the load on the motor varies with the speed
automatically.

Answer / bala

its not by changing the voltage are flux, its by changing
frequency we can vary the speed

1 hp single phase motor is more likely to get hot thsn inone hp 3 phase motor its true or false? If true why?

3 Answers   Focus, Focus Energy,

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Myself completed B.Tech ECE in private university but i am working as an testing and commissioning engineer in electrical field whether i am eligibility to apply electrical licence.

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how do we select a copper power cable for a 10 HP, 1440 rpm, 440V, 3 phase AC motor?

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what the main difference of the 3 phase and 2 phase power supply??

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What is VVVF Drive ?

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How many earthings are provided for a 250KVA distribution transformer?

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why dc supply is not applied for step up or down in transformer

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