What polarity do interpoles take in a DC motor?
- Either, provided they lay on the MNA.
- The same as the next main pole ahead in the direction of rotation.
- The same as the next main pole behind in the direction of rotation.
Explanation
Interpoles cancel armature reaction and aid commutation, so in a motor they must have the same polarity as the main pole immediately behind in the direction of rotation. Note the motor rule is the reverse of the generator rule, where interpoles match the pole ahead, because current direction through the armature differs between motoring and generating.
Apathy asking:
Can someone explain this?
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