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How many design steps are present in the design of PMDC motors?

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How many design steps are present in the design of PMDC motors?

(a) 8

(b) 9

(c) 10

(d) 11

The question was posed to me in homework.

This interesting question is from Design Steps and Considerations topic in portion Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

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Right option is (d) 11

To explain: There are 11 steps involves in the design of the PMDC motors. They are minimum sum of air gap volume and magnet volume, ratio of magnetic to electric loading, area of magnet, length of magnet, value of flux, number of turns per coil, running armature resistance, armature diameter, axial dimensions, wire cross section and radial thickness.

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