Electrical Engineering · Induction Machines
The phenomenon of 'cogging' in a three-phase squirrel cage induction motor occurs when the motor refuses to start under certain conditions. This is primarily caused by:
- 1The presence of the 7th space harmonic in the air-gap flux
- 2One of the three phases being short-circuited to the ground
- 3The number of rotor slots being equal to the number of stator slots✓
- 4A significant reduction in the supply frequency
Correct answer
The number of rotor slots being equal to the number of stator slots
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