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In the PMDC motors the brush shift should be approached with considerable caution.

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in Design of Electrical Machines by (687k points)
In the PMDC motors the brush shift should be approached with considerable caution.

(a) true

(b) false

This question was addressed to me in final exam.

My question is based upon Design Steps and Considerations topic in portion Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

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Right answer is (a) true

For explanation: The brush shift in the PMDC motor should be approached with considerable caution. This is because as flux shift in the ceramic magnet will be found to be almost negligible.

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