Abstract：Flux-weakening control technology can effectively broaden the speed range of the permanent

magnet synchronous machine（PMSM），therefore，it is of great significance to the research on the flux-weakening control of permanent magnet synchronous machine. Most of flux-weakening modified the flux-weakening current command through a single PI link，and its response speed is slow and difficult to meet the high-performance control requirements，and due to the high coupling and nonlinearity of the flux-weakening loop，PI parameters setting is difficult. In order to solve the above shortage，a method of using a conversion look-up table was proposed to be added to the control system as a feedforward，having accelerated the speed of flux-weakening adjustment.While，the method of gain linearization was adopted，by analyzing the changes of the small signal model at different operating points，it solved the problem that the fixed PI parameters of the flux-weakening loop controller that have been set by experience cannot cope with the change of the operating point，which improved the stability and accuracy of the system. Finally，according to the simulation and experiments，it was verified that the improved method can improve the performance of flux-weakening control.

      Key words：permanent magnet synchronous machine（PMSM）；flux-weakening control；look-up table

algorithms；small signal model；gain linearization