Effects of position sensing dynamics on feedforward current control of permanent magnet synchronous machines

The impact of position sensing dynamics, including time-delays caused by magnetics, electrical transmission of sensed signals and A/D conversion, on feedforward current control of permanent magnet synchronous machine (PMSM) drive systems are presented in this paper. Further, the effect of misalignment of the position sensor zero with the machine back-EMF is also presented. The different error sources are modeled analytically and their impact on the feedforward current control system are described. The analytical study is validated by simulation and experimental results for both nonsalient pole and salient pole PMSMs.