Given a motor rated at 460 V, 60 Hz, 900 rpm, 10 HP motor. This motor has a VFD supplying voltage…

Given a motor rated at 460 V, 60 Hz, 900 rpm, 10 HP motor. This motor has a VFD supplying voltage and frequency to the motor stator and the maximum value of voltage that the VFD can provide to the motor is 460 V. The maximum frequency the VFD can supply to the motor is 120 Hz. Calculate the following.

A. Nominal torque available from the motor at 900 rpm.

B. Nominal volts-to-hertz ratio that this torque is based on.

C. Volts-to-hertz ratio for the motor when it is at 10% overspeed or 990 rpm (assume applied frequency of 66 Hz) knowing that the applied stator voltage does not change from 460 V.

D. Torque available from the motor at 10% overspeed or 990 rpm (assume applied frequency of 66 Hz) knowing that the applied stator voltage does not change from 460 V.

E. Percentage change in torque normalized to the nominal torque of the machine.

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