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.
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Transcribed Image Text: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 Lg= 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.
b. Calculate the rated phase current.
c. Calculate the rated line to line voltage of the PM motor.
с.
d. At a speed of 7300 rpm, the PM motor operates in field weakening mode with a direct
axis current of -30A and produces a torque of 30 Nm. Determine the per-phase current
at this operating condition.
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