(School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200090, China)

 Abstract: Aiming at problems of the magnetic powder brake in torque loading system, such as the loading precision is not high enough and the response time is not fast enough, because of the hysteresis of magnetic resistance, saturation of magnetic flux, Non constancy of magnetic conductivity. The self adaptive fuzzy PID controller is studied by matlab/simulink that applicants in worm reducer loading system. It is used to optimize the parameters of PID online. By the test, the results indicate that the self adaptive fuzzy PID controller can improve the loading precision and reduce response time of the system. It also has good adaptability and stability, and can be used to realize effective control of the loading system.

 Key words: self adaptive fuzzy PID controller; magnetic powder brake; loading; worm reducer