Answered: 6.) . The NTD fuse rating for a 230 V,…

6.) . The NTD fuse rating for a 230 V, 3Ø, 50 hp synchronous motor with an 80 % power factor using the Exception Standard is A. 250 A B. 300 A C. 350 A D. 400 A

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 6RQ: Name three factors that determine the torque produced by an induction motor.

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Concept explainers

Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.

Question

6.) . The NTD fuse rating for a 230 V, 3Ø, 50 hp synchronous motor with an 80 % power factor using the Exception Standard is A. 250 A B. 300 A C. 350 A D. 400 A

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