Brushless DC Motor Speed Control System of the Walking Aids Machine

In this paper, brushless DC motor is preferred to be the motive force of the electric walking aids machine. We adopt Y connected three-phase full-bridge drive mode as control scheme. Based on the analysis of brushless DC motor three closed-loop control scheme, a control system is designed. The core of the hardware of this system is TMS320F2812 and intelligent power module (IPM). TMS320F2812 of TI Company is used as micro-controller chip and IPM of IR Company is used as driver chip. The program is written in the C language and assembly language. Based on the analysis of brushless DC motor closed-loop control scheme, by combining PID algorithm with the mathematical model of BLDCM, a method of modularization design for LDCM control system provided, which reach the simulation of current loop and speed loop control. This model offers a perfect experiment environment for analyzing and designing BLDCM control system.