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minute (rpm) determine the voltage frequency of thegenerator. With a fixed number of poles, constant frequencyrequires constant rotor rpm.An ac generator-rotating field has 12 poles withadjacent poles of opposite polarity. Each pair of polesproduces one cycle per revolution; therefore, eachrevolution produces six cycles. The output frequency ofthe generator varies in direct proportion to the enginedrive speed. A generator operating at 6,000 rpm isoperating at 100 revolutions per second or at 600 Hz.
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