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What is the range of the permeance coefficient in the PMDC motors?

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in Design of Electrical Machines by (687k points)
What is the range of the permeance coefficient in the PMDC motors?

(a) 3-5

(b) 4-9

(c) 4-8

(d) 3-9

The question was posed to me in unit test.

Enquiry is from Design Preliminaries topic in division Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

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Best answer
Right choice is (c) 4-8

The best explanation: The minimum value of the permeance coefficient used in the PMDC motors is 4. The maximum value of the permeance coefficient used in the PMDC motor is 8.

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