Equivalent loading of induction motors using a new composite power supply with a linear (U/Hz) characteristic

This paper describes a mixed variable voltage magnitude variable frequency (VVMVF) power supply with linear U/Hz characteristic that can be used for equivalent loading of ac machines. The proposed voltage source ensures the rated air gap flux as well as forces the rated current (Irms) inside the test machine without the need to connect a mechanical load to the shaft. This means that the motor total losses essentially will be the same as under …