To realize the fast track control under load change, fuzzy PI control er is used to takes the place of the traditional PI control er with fixed parameters control strategy, using the tracking error signal to control the parameters. In the modelig of brush less DC motor, this paper gives out the ideal back EMF waveform to solving the difficult problem before, uses the piece-wise linear method to write s-function, establish the speed control simulation model with fuzzy PI control er and current loop of BLDCM through MATLAB, analyze brush less DC motor's dynamic, static performance and obtain the ideal phase current, BEMF waveform and torque. The simulation results show that compared with the conventional PI control er,the fuzzy adaptive PI control er is used to achieve the fast tracking control of load change and improve anti-interference ability and the response speed of the system.%为了实现负载变化情况下转速的快速跟踪控制，采用模糊 PI控制器，改变传统 PI控制器的固定参数的控制策略，采用根据跟踪误差信号来实时控制参数的方法。无刷直流电机建模过程中，给出了较理想的反电动势波形是一直难解决的问题，采用分段线性法编写S-函数，通过MATLAB建立无刷直流电机速度环和电流环的双环控制系统仿真模型，其中速度环采用模糊 PI控制，分析了无刷直流电机的动、静态性能，得到了理想的相电流、反电动势以及扭矩的波形图。仿真结果表明相对于常规 PI控制，采用模糊自适应PI控制器实现负载变化情况下转速的快速跟踪控制，提高了系统的抗干扰能力，提高了系统的响应速度。
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