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What factor does the permeance coefficient depend upon?

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What factor does the permeance coefficient depend upon?

(a) geometry of the magnet

(b) geometry of the magnet, airgap, associated non-portions of the magnetic circuit

(c) airgap

(d) associated non-portions of the magnetic circuit

I got this question by my college professor while I was bunking the class.

My enquiry is from Design Preliminaries in portion Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

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The correct answer is (b) geometry of the magnet, airgap, associated non-portions of the magnetic circuit

The best explanation: The permeance coefficient depends upon the geometry of the magnet and the airgap. It also depends on the associated non-portions of the magnetic circuit.

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