An alternating current generator is known as alternator. Here this device generates a pure intrinsic sine wave of output voltage at power frequency 50 Hertz or 60 Hertz. When a conductor is allowed to move past two well defined magnetic poles on the alternator, the voltage goes through one cycle. So naturally conductor prefer 100 or 200 pole pitches. This pitch or speed is known as the synchronous speed for the given number of poles.
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