Abstract: In order to optimize the controller structure of the permanent magnet synchronous motor（PMSM），a simplified speed control strategy for the PMSM based on genetic algorithm（GA）was proposed.The new controller mainly includes a direct voltage controller，which uses the motor model to achieve accurate speed tracking，so the closed loop of current regulation is avoided，and the control structure is simplified，and there is no need to rely on motor parameters and voltage or current sensors. At the same time，the control gains are determined by genetic algorithm to ensure maximum torque per ampere operation at the full range of the machine.Therefore，the problem of the absence of current regulation loops leads to higher energy consumption is solved. Steady state and dynamic performance tests were carried out by the PMSM driving experiment platform.The new control strategy was verified with similar control performance as the classical control scheme by test results. And its control structure is much simpler，so it can be a good candidate for a low-cost implementation of real-time PMSMdrives.

      Key words: permanent magnet synchronous motor（PMSM）；speed control；genetic algorithm（GA）；direct

voltage control