Discussion
Slip compensation in an open-loop V/f drive works by
Answer: C
Correct answer: raising the frequency in proportion to the measured current
An induction machine slips more as it is loaded, so an open-loop drive holding a fixed frequency lets the shaft slow down. Slip compensation infers the load from the measured current and raises the frequency to offset the expected slip, recovering much of the regulation of a closed loop without a feedback device.
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