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Inverter minimum operation frequency

A frequency inverter can operate down to its minimum designed frequency, however, the motor design and load characteristics determine the minimum PRACTICAL frequency. If the motor is force cooled and the frequency inverter is operated in vector mode, as long as there is encoder feedback, and the load is not excessive, it is possible to achieve 100% torque at zero frequency.

Some manufacturers' inverters can provide 100% torque at Zero speed without an encoder. A properly rated and designed motor can be provided to operate at Zero speed, full torque (often called 1000:1 speed range motors). This is a very typical motor requirement for Paper Winders and Rewinders, and Steel Coilers and Uncoilers.

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