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A much lower inertia in Surface wound armature type is obtained by placing the winding on a non-magnetic cylinder which rotates in annular space between permanent magnet stator and stationary rotor.

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A much lower inertia in Surface wound armature type is obtained by placing the winding on a non-magnetic cylinder which rotates in annular space between permanent magnet stator and stationary rotor.

(a) True

(b) False

This question was posed to me during a job interview.

Origin of the question is Controller Components in section Control System and Components of Control Systems

1 Answer

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Right answer is (a) True

Explanation: Because of larger air gap strong permanent magnets are needed and much lower inertia is obtained by placing non-magnetic cylinder which rotates in annular space between permanent magnet stator and stationary rotor.

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