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when an induction motor connected to a constant 3-phase source slows down from its rated speed.

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Thread Starter

xizhouxiang

Joined Mar 23, 2017
1
when an induction motor connected to a constant 3-phase source slows down from its rated speed. what happens to the stator current amplitude and frequency? the magnetizing flux?
 
MaxHeadRoom

MaxHeadRoom

Joined Jul 18, 2013
27,659
What is slowing it down? load?
A 3ph induction motor at switch on represents a 3ph transformer with shorted secondaries.
The current in the rotor is dependent on the relationship between the rotating stator field and the rpm of the rotor, as the rpm of the rotor approaches synchronism, (which it can never reach), the current diminishes.
The rpm of the rotor off load usually achieves the rotation rate of the stator field minus 4 or 5 cycles (AKA slip frequency).
Max.
 
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