A 50 Hz three-phase induction has 8 poles, the rotor speed is 731.25 rpm. The Power supplied to the motor is 40 KW and the Stator Losses are 1.5 KW. Find the: (a) Synchronous speed and slip (b) Rotor Copper Loss, (c) Total Mechanical Power Developed by the Roto

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter35: Harmonics 916

Section: Chapter Questions

Problem 3RQ: Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction...

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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

A 50 Hz three-phase induction has 8 poles, the rotor speed is 731.25 rpm. The Power supplied to the motor is 40 KW and the Stator Losses are 1.5 KW. Find the: (a) Synchronous speed and slip (b) Rotor Copper Loss, (c) Total Mechanical Power Developed by the Rotor, (d) Output Power of the Motor if Friction and Windage Losses are 1 KW, (e) Efficiency of the Motor, neglecting Rotor Iron Losses

Branch of science that deals with the stationary and moving bodies under the influence of forces.

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