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Unformatted text preview: 0.1 V)
d. What is the efficiency at this operating point? (80.6%)
Problem 5: A 10HP PM DC motor is controlled by a power converter that can adjust its
terminal voltage between 0 and 120VDC. The input voltage to the power converter is 144VDC.
The parameters of the machine are ra = 0.143Ω, Kv = 1.104V·s and TLoss is negligible. If TLoad is
fixed at 70N·m (regardless of speed):
a. To achieve a rotor speed of 60rad/s,
i. Find the required armature current and armature voltage.
[Ia = 63.4A, Va = 75.3V]
ii. Find the converter duty cycle.
[D = 52.3%]
iii. If the converter is 93% efficient, determine the average current out of the
[Is = 35.6A]...
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- Fall '08