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Which of the following is most favoured choice for PMDC motor?

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Which of the following is most favoured choice for PMDC motor?

(a) Neodymium-iron-boron

(b) Iron-nickel

(c) Nickel-neodymium

(d) Cannot be given

I had been asked this question in semester exam.

My doubt stems from PMDC Motors topic in section DC Machines of DC Machines

1 Answer

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The correct choice is (a) Neodymium-iron-boron

Explanation: Obvious choice of PMDC motor is neodymium-iron-boron which has high coercivity and high retentivity. Its characteristic is almost a straight line. Hence, neodymium-iron-boron combination is preferred over the other materials.

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