Performance Improvement of the IPMSM Position Sensor-less Vector Control System by the On-line Motor Parameter Error Compensation and the Practical Dead-time Compensation

This paper proposes the performance improvement methods for the IPMSM position sensor-less vector control system. The stability of the position sensor-less control is influenced by the motor parameter error and dead time compensation error. Especially, it becomes problem in case of the extreme temperature variation and at low speed. The influence on the position estimation is analyzed for the proposed method which using an armature current flux adaptive observer. For performance improvement and simplification of control system, the offline parameter measurement of a stator resistance, permanent magnet flux, d,q-axis inductances, and dead-time compensation are proposed. And the on-line parameter error compensation method is applied to reduce the position error, which uses only the observer signal without any additional sensor or signal injection. In addition, the practical dead-time compensation method is proposed based on the experimental measurement. Experimental results of the test system using the proposed methods showed good performance.