Servomotor Modelling and Control for Medical Robots

In the driving technology of brushless DC motor (BLDCM), there are two methods: vector control (sine wave control) and 120 degree square wave control (rectangular wave control). In the analysis of some applications of medical instruments by BLDCM, the vector control method makes the running noise of BLDCM small, and has good low-speed torque stability and stability, but the power loss of the vector control mode is large. In addition, the software structure is complex and the adaptability to the motor is relatively poor. In this paper, combined with the application of BLDCM in medical walking assisted robot, firstly, in Matlab/Simulink, the simulation model of the system is constructed. Then, PID parameters are obtained by modeling and analyzing the system. Through the simulation data comparison vector control and 120 degree square wave control, the speed following characteristics under two control modes prove that the superiority of using 120 degree square wave control under the premise of meeting the actual operation requirements. This paper has important guiding significance for the development of medical robot drive technology.