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28-12-2013 #9
The relationship between frequency (cycles per sec. or hz) for the motor speed is cycles per minute (3000 at our mains frequency of 50hz) divided by the no. of pairs of poles on the motor. The motor will actually run at a slightly lower speed due to slip. I am fairly sure that is correct, but am talking from memory of of nearly 60 years ago!!! G.
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