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For good performance the small dc motor should have magnetic to electrical boarding ratio greater than 70.

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For good performance the small dc motor should have magnetic to electrical boarding ratio greater than 70.

(a) true

(b) false

I had been asked this question in a job interview.

My question comes from Design Preliminaries topic in division Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

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Correct choice is (b) false

The best explanation: The performance of the small DC motor depends on the magnetic to electrical boarding ratio. The magnetic to electrical boarding ratio should be greater than 50 for good performance.

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