3 PHASE AC INDUCTION MOTORS & CURRENTS DRAWN
3 PHASE AC INDUCTION MOTORS & CURRENTS DRAWN
(OP)
please help me for -
i have an induction motor rated for 3 phase / 415 v /50 hz AC supply.
if i connect it to 3 phase / 380VAC/ 60 HZ SUPPLY at rated load, then what will be the current drawn by the motor.
regards
i have an induction motor rated for 3 phase / 415 v /50 hz AC supply.
if i connect it to 3 phase / 380VAC/ 60 HZ SUPPLY at rated load, then what will be the current drawn by the motor.
regards





RE: 3 PHASE AC INDUCTION MOTORS & CURRENTS DRAWN
I2=(415/380)xI1 in amps, where
I1=(746 x HP)/(sqrt3 x 415Volts x Power Factor x Efficiency)
The missing data should be on the motor nameplate or within the catalog cut.
RE: 3 PHASE AC INDUCTION MOTORS & CURRENTS DRAWN
RE: 3 PHASE AC INDUCTION MOTORS & CURRENTS DRAWN
thanks a lot,
i am more interested in combined effect of increased frequency and reduced supply voltage.
can you help further
regards
c.g.inamdar
RE: 3 PHASE AC INDUCTION MOTORS & CURRENTS DRAWN
RE: 3 PHASE AC INDUCTION MOTORS & CURRENTS DRAWN
RE: 3 PHASE AC INDUCTION MOTORS & CURRENTS DRAWN
415V/50 Hz = 8.3 V/Hz
380V/60 Hz = 6.33 V/Hz
If the motor were connected to a 480V, 60 Hz supply, the result would be 8.0 V/Hz, which would provide closer to the rated value.
Also note that the cooling fan loss will be higher at the higher shaft speed.
RE: 3 PHASE AC INDUCTION MOTORS & CURRENTS DRAWN