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A single-phase induction motor that starts on no load but stalls under load probably has

  • A.a run capacitor that has lost much of its capacitance
  • B.an open circuited main winding on the stator
  • C.a seized bearing on the rotor shaft
  • D.a centrifugal switch that has failed to close as it should

Answer: A

Losing the run capacitor leaves the machine with a badly elliptical field and much reduced running torque, which is enough for no load but not for the duty. Measuring the capacitor is the first check on such a symptom.

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