| Permanent Magnet Synchronous Motor (PMSM) has been widely used in industrial control areas for its high efficiency density and energy conversion efficiency. In order to achieve high performance such as high control precision, wide speed extension and strong suitability to environment, it is essential to apply the advanced control system on the motor. Therefore, the research of the PMSM speed control system attracted much attention.In practice, as the reason of the limitation of the supply voltage and the saturation of the current regulator, the performance declines when the speed of PMSM rises upon the basis value, and the application of PMSM is restricted, in this case, the flux-weakening control theory is used in the industrial application. For the rotor of PMSM is composed of the permanent magnets, the constant magnetic field strength can't be changed. In general, when the motor enters the flux-weakening region, the stator current vector is changed to reduce the magnetism.However, the armature reaction is severe along with the increase of the speed, it will result the variation of the parameters of the motor and the control performance decrease finally. In order to reach the ideal control performance, the stator current compensation theory is applied to reduce the influences from the parameters variation.A Fuzzy Controller for the compensation of the Direct-axis current component in the flux-weakening control system of PMSM is proposed in this paper. The control method is implemented in the experimental platform based on TI DSP chip, the experiment results demonstrate that the Fuzzy control rules and parameters adopted in this paper can improve the performance of torque effectively. Finally, a summary of the full text and the suggestion of the future work are provided.
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