Discussion
Which of these single-phase types has no auxiliary winding at all?
Answer: C
Correct answer: The shaded pole machine
The shaded pole machine has only its main winding; the phase displacement comes from a short-circuited copper ring around part of each pole, in which induced current delays the flux locally. This makes it the simplest and cheapest of all, at the cost of very low starting torque, poor efficiency and no easy means of reversal.
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