Discussion
A variable reluctance stepper motor has a rotor that is
Answer: C
Correct answer: toothed soft iron with no winding or magnet
The variable reluctance rotor is simply a shaped piece of soft iron, which makes it cheap, robust and light - a low inertia that suits rapid stepping. The price is that with no magnet there is no detent torque, so the rotor is free to turn when the machine is de-energised.
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