so the operating speed is 1440 rpmrpmns251.5103×=ns25120 25⋅2=At 60 hz, the motor runs a 3560 rpm at full load indicating 40 rpm of slipe. The approximate operating speed can be found by calculating the synchronous speed at 25 hz and then subtracting the slip speedHP85hz100hp=HP85hzHPrated=d. Above rated frequency, we are in the constant hp regime soHP25hz41.667hp=HP25hzf25fratedHPrated⋅=c. Rated hp at 25 hz, will be proportional to frequency soV85hz460V=V85hzVrated=b. At 85 hz, only rated voltage would be applied to the motorwe should apply 191.7 volts (line to line) to the motorV25hz191.667V=V25hzf25fratedVrated⋅=f2525 Hz
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