A 60-HP synchronous motor is connected to 240 volts. The motor is to be operated at 90% PF. The motor is a NEMA Code D. What size copper conductors with type THW2 insulation should be used to connect this motor?

A 60-HP synchronous motor is connected to 240 volts. The motor is to be operated at 90% PF. The motor is a NEMA Code D. What size copper conductors with type THW2 insulation should be used to connect this motor?

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter10: Using Wire Tables And Determining Conductor Sizes

Section: Chapter Questions

Problem 6PP: 6. A 50-hp DC motor is connected to 250 volts. The motor does not contain a NEMA code. The motor is...

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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.

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A 60-HP synchronous motor is connected to 240 volts. The motor is to be operated at 90% PF. The motor is a NEMA
Code D. What size copper conductors with type THW2 insulation should be used to connect this motor?

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