Modelling and Identification of Saturation Effects of Permanent Magnet Synchronous Motors

摘要

Permanent magnet synchronous motors (PMSM) are often used for high performance drive applications,rndue to their good dynamic characteristics. The design model for the control is based on a fundamentalrnwave machine model. Non-linear effects caused by magnetic saturation are completely neglected. However,rnat high currents these effects significantly affect the operating and control performance of the drivernsystem [2]. For optimal operation at overload or for an accurate determination of magnetic anisotropiesrnfor sensorless control applications, a more sophisticated machine model is required. This contributionrnprovides an extended analytical model for permanent magnet synchronous motors that covers magneticrnanisotropies and cross saturation effects as well as saturation induced current harmonics. For validation,rnsimulation results of the deduced model are compared to actual measurements on a servo drive bothrnfor the fundamental wave and harmonic behaviour.