Answered: 6. The power input to the d-e field of…

6. The power input to the d-e field of a 15-kva (input) synchronous motor is 6 per cent of the rated a-c input. What is the direct current that excites the field at 120 volts?

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter33: Single-phase Motors

Section: Chapter Questions

Problem 31RQ: Why is the AC series motor often referred to as a universal 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 power input to the d-e field of a 15-kva (input) synchronous motor is 6 per
cent of the rated a-c input. What is the direct current that excites the field at
120 volts?

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