how we calculate the 30 KW 3phase electric motor current on
noload
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Answer Posted / marcin
Equation with power factor in is the most correct. Several
issues shall be counted before estimating no load current :
- number of the poles
- power factor - there is a curve from the manufacturer
showing how this is changed in a function of power
- size of the machine
- speed
- way of feeding machine - DOL / inverter
Example :
500kW machine 690V 750rpm In=670A, No load - 285A (~42%)
500kW machine 690V 100rpm In=520A, No load - 180A (~34%)
Answer :
KW = 1.732 * V * I * cos phi * K
where K is a factor taking all other circumstances (0,7 to 1
where 1 is ideal situation) lower K for higher number of
poles, multispeed machines, specific construction etc...
| Is This Answer Correct ? | 6 Yes | 4 No |
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