The break operation of the I.M. at speed less than synchronous speed is: OWhen rotor rotates in the same direction of the rotating field. OThe rotor rotates in opposite direction to the rotating field. OThe rotor is open circuited.

The break operation of the I.M. at speed less than synchronous speed is: OWhen rotor rotates in the same direction of the rotating field. OThe rotor rotates in opposite direction to the rotating field. OThe rotor is open circuited.

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter39: Synchronous Motor Operation

Section: Chapter Questions

Problem 12SQ

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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

The break operation of the I.M. at speed
less than synchronous speed is:
OWhen rotor rotates in the same direction of the
rotating field.
OThe rotor rotates in opposite direction to the
rotating field.
OThe rotor is open circuited.

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