Discussion
Match the machine with the source of its torque.
1. Switched reluctance 2. Hysteresis 3. Permanent magnet synchronous
P. Lag of magnetisation behind the field Q. Rotor alignment with excited stator poles R. Interaction of magnet flux with stator current
Answer: C
Correct answer: 1-Q, 2-P, 3-R
Three quite different torque mechanisms. The switched reluctance machine develops torque from the rotor’s tendency to align with the excited stator poles. The hysteresis motor develops it from the lag of the rotor material’s magnetisation behind the revolving field, which is why it produces constant torque at any speed. And the permanent magnet synchronous machine develops it from the interaction of magnet flux with stator current.
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