A 3-phase, 48 kW, start-connected permanent magnet (PM) motor has a rated speed of 6600 rpm when supplied from a 110 Hz supply. The d-axis and q-axis inductances are La= 3.5mH and Lq= 4.7mH, respectively. The armature resistance and rotational losses are negligible. The motor operates without field weakening up to 6600 rpm, and a negative direct-axis current is imposed if the motor operates at speeds above 6600 rpm. The no-load terminal line-to-line voltage at 5000 rpm is 420 V (RMS). a. Determine the permanent magnet flux linkage.

A 3-phase, 48 kW, start-connected permanent magnet (PM) motor has a rated speed of 6600 rpm when supplied from a 110 Hz supply. The d-axis and q-axis inductances are La= 3.5mH and Lq= 4.7mH, respectively. The armature resistance and rotational losses are negligible. The motor operates without field weakening up to 6600 rpm, and a negative direct-axis current is imposed if the motor operates at speeds above 6600 rpm. The no-load terminal line-to-line voltage at 5000 rpm is 420 V (RMS). a. Determine the permanent magnet flux linkage.

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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