Efficiency measurements on electric motors

More and more often, electric motors are controlled with frequency converters. This is in order to achieve a higher efficiency. But how efficient is this motor control actually?

For accurate measurements of the entire drive system, we need to measure the entire drive chain. In this example we assume a three-phase AC power supply which is rectified to a DC power supply for the frequency inverter. Next, we measure the electrical output of the AC drive and the mechanical energy of the electric motor in order to get a total overview of the various losses or the efficiency of the entire system.

In EV traction systems, the AC input and the rectifier are eliminated and we have the car battery as input of the three-phase inverter.

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