Single phase motor changes direction on start
Posted 03 February 2005 - 10:37 PM
Posted 07 February 2005 - 09:08 AM
After a lot of reading to understand the configuration of my single phase motor I got out the DVM and found the start winding to be open circuit. Fortunately this was caused by the centrifugal switch being slightly open even when the motor was stopped. I simply adjusted the contacts and now all is well!
Posted 14 February 2005 - 10:01 AM
Thank you for posting the solution.
I was at a bit of a loss to give3 an answer from your description. Usually, an open start winding will cause the motor to vibrate and draw lots of current, but not rotate in any direction. This is due to the single phase field being effectively two fields that are equal in amplitude, rotating in oposite directions. The start winding adds a second phase and causes a net rotating field in one direction only.
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