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Which speed control method is employed in PMDC?

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in DC Machines by (506k points)
Which speed control method is employed in PMDC?

(a) Field control method

(b) Armature control method

(c) Armature Field control method

(d) Cannot be determined

I have been asked this question by my school principal while I was bunking the class.

Query is from PMDC Motors topic in chapter DC Machines of DC Machines

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Correct option is (b) Armature control method

To explain: Unlike in DC motors, field is provided by permanent magnets in PMDC. This implies that field provided in PMDC motor is permanent and can’t be altered unless whole construction is modified. Thus, armature voltage control method is employed here.

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