Electrical Engineering ⇒ Topic : Cogging
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Gopal
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COGGING When the number of rotor slots is equal to the number of stator slots, the speeds of all the harmonics produced by the stator slotting coincide with the speed of corresponding rotor harmonics. Thus harmonics of every would try to exert synchronous torques at their synchronous speeds and the machine would refuse to start. This is known as cogging (or magnetic locking).Therefore the number of stator slots should never be equal to the number of rotor slots. Cogging of squirrel cage motors can be easily overcome by making the number of rotor slots prime to the number of stator slots | |
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