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What is the range of length of the magnet in the PMDC motors?

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What is the range of length of the magnet in the PMDC motors?

(a) 2.5-4 cm

(b) 2-3 cm

(c) 2.5-3 cm

(d) 1.5-4 cm

This question was addressed to me during an online exam.

The origin of the question is Design Steps and Considerations topic in chapter Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

1 Answer

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Best answer
The correct choice is (a) 2.5-4 cm

Best explanation: The minimum value of the length of the magnet in the PMDC motor is 2.5 cm. The maximum value of the length of the magnet in the PMDC motor is 4 cm.

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