Question

what should be done to run DC motor above the rated speed?​

Answer 1

Increasing the speed can be achieved by increasing the supply frequency as the speed and frequency are directly proportional; however, there are two constraints. The first is the saturation of the magnetic circuit, but this issue can be significantly avoided by keeping the V/f ratio constant.

Answer 2

Answer:

Motor over-speed is possible (i.e. over the base motor speed) only in the de-fluxing region that is constant power. Obviously one can increase the speed by increasing the frequency using an inverter but that does not mean that the motor would follow suit that speed with no risks!!! Unfortunately, with the increase of speed at least two conditions should be observed to avoid the failure of the motor:

Explanation:

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