Current control of PMSM in overmodulation region

This paper presents a study on a current control of a PM synchronous motor which is fed by two-level voltage source inverter in the large modulation index area. In order to increase dynamic response and extend speed limit caused by voltage limit, overmodulation method is generally used. But, the voltage ripple generate current ripple in overmodulation region. This current ripple reduce current controller bandwidth. In this paper, an improved current controller has been proposed for overmodulation region. The methods are described and analyzed and the experimental results are presented.