Three phase motor power

[tahir4awan]

Hello,
I have a question regarding three phase motor power. On motor the current is given for one phase. Then the power given on the motor is for one phase.

If a three phase motor is 1kW, is it in realty 3kW motor?

Or I have misunderstood?
Thanks

 

[KlausST]

Hi,

If I wanted to know ... I´d do an internet search for "how to read a motor name plate" ... or similar...

Klaus

 

[FvM]

On motor the current is given for one phase. Then the power given on the motor is for one phase.

Simple answer: no.

 

[cupoftea]

1kW motor can supply 1kW of real power.

 

[tahir4awan]

Can someone give me a simple answer, whether a 1 kW three phase motor is actually a 3kW motor. Yes I have searched internet it gives general power formula.

 

[FvM]

The question was already answered.
1 kW labeled motor is 1 kW motor, it can supply 1 kW mechanical power (specific torque at rated speed) at the shaft. Electrical real power consumption with full load is slightly higher, e.g. 1.1 kW.

--- Updated Today at 9:49 AM ---

Rated phase current will be considerably higher than rated motor power/(3 * phase voltage) because motor is consuming a lot of reactive power. This may have led you to wrong conclusion about motor power.

 

[tahir4awan]

Thanks for your help.