Parasitic Torques of Saturised Asynchronous Motors

The paper deals with the analysis of field harmonics in an asynchronous machine. It is proved that with increasing saturation of the magnetic circuit, the influence of the higher space harmonics on the field form is reduced. This causes reduction of the parasitic torques. Results of theoretical calculations have been compared with measurements of synchronous and asynchronous parasitic torques, which have been obtained for different supply voltages of the motor; satisfactory accordance is shown to exist.