Discussion
True or false: a V/f drive removes the need to consider motor cooling at low speed.
Answer: B
Correct answer: False, since a self-ventilated machine cools poorly at low speed
A totally enclosed fan-cooled machine carries its fan on its own shaft, so the airflow falls off with the speed while the current, and with it the copper loss, may be undiminished. Running such a machine at 20 per cent speed on a V/f drive can overheat it at a torque it handles indefinitely at full speed. The usual remedies are a separately driven blower or derating the torque at low speed.
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