A new field oriented control structure is presented which makes it possible to use synchronous optimal PWM (SOPWM) for high-speed PMSM drives. Due to the simplicity of modulator and control, parametrization is straightforward. The algorithms are implemented on an industrial drive controller. Measurement results show the advantages compared to standard PWM schemes using asynchronous space vector modulation (SVPWM).
Rotor losses have a major impact on the performance of high-speed permanent magnet synchronous machines. Therefore a way to reduce rotor losses by using shielding cylinders is proposed and the effects of these measure are discussed according to the main causes of the rotor losses, which are current harmonics and winding harmonics. The loss minimisation will be demonstrated a for a specific high-speed motor design.
It is known that high-speed machines have high power and loss densities [1]. The additional losses in the rotor caused by harmonics are particularly critical, as they act in the center of the machine. This paper shows an approach to reach small additional losses without a filter between inverter and machine.