A 3-phase, 12 kW, start-connected permanent magnet (PM) motor has a rated speed of 2200 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 2200 rpm, and a negative direct-axis current is imposed if the motor operates at speeds above 2200 rpm. The no-load terminal line-to-line voltage at 1250 rpm is 420 V (RMS). a. Determine the permanent magnet flux linkage. b. Calculate the rated phase current. c. Calculate the rated line to line voltage of the PM motor.

A 3-phase, 12 kW, start-connected permanent magnet (PM) motor has a rated speed of 2200 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 2200 rpm, and a negative direct-axis current is imposed if the motor operates at speeds above 2200 rpm. The no-load terminal line-to-line voltage at 1250 rpm is 420 V (RMS). a. Determine the permanent magnet flux linkage. b. Calculate the rated phase current. c. Calculate the rated line to line voltage of the PM motor.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 6RQ: Name three factors that determine the torque produced by an induction motor.

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