Starting a single phase induction motor

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Uploaded by on Jul 9, 2009

How single phase induction motors are started. The type with a start and run winding is explained here.

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Science & Technology

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Uploader Comments (vegmatic1966)

  • Useful vid, But how is to identify which is the run winding and which is the start winding using an ohmmeter? regards

  • @TheMrmujid  On three terminal motors it is easy. Lowest resistance is run winding to common, higher resistance is phase winding to common, slightly higher resistance is across the run and phase winding.

  • An electrical parts or machine/motor supply company may be able to help.

  • Based on resistance values, how do you determine which is the start and which is the run windings for troubleshooting purposes?

  • @redexit Lowest resistance = main winding. Higher resistance = start (phase) winding. Highest resistance = measuring across the start and run windings (three terminal arrangement).

  • the capacitor for the permanent split phase motor basically makes the motor a 2 phase motor providing smooth quiet running operation since there is a rotating magnetic field produced by the stator instead of just a pulsating magnetic field like the resistance start or capacitor start motors

  • @Gobdobber Yes, I have noticed when unplugging the capacitor from an already spinning motor that there is more AC line frequency hum and more current gets drawn although the motor continues to spin normally.

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  • @vegmatic1966 thanks f reply, So What are the other termination types other than 3 terminal motor? please advice

  • I installed a new fan motor with 3 wires on my ac and it turn backwards unless i spin it the right way.But when it turns off it will not come back on.Whats up?

  • Where would one find a capacitor like this? I have a similar motor that can not start without the capacitor. By the way I am in Australia

  • Where wou

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