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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?
when an induction motor connected to a constant 3-phase source slows down from its rated speed.
- Thread starter xizhouxiang
- Start date
MaxHeadRoom
- Joined Jul 18, 2013
- 30,559
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.
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.
The magnetizing flux stays essentially constant.
