中文摘要：

在传统的无刷直流电机控制系统中，由于大多采用位置传感器来获取电机转子位置信号，导致电机体积增加，控制线路变得复杂，因而限制了无刷电机在恶劣环境中的使用。为了改善位置传感器使用带来的弊端，本文设计并制作了一个基于美国德州仪器公司（TI）的数字信号处理（DSP）芯片TMS320LF2407A为主控制芯片的无位置传感器的无刷直流电机控制系统。采用虚拟中性点提取电机反电动势过零点从而捕捉电机转子位置信号，电机启动采用三段式，逆变器的上桥臂使用脉宽调制（PWM）而对应的下桥臂恒定导通，电机调速采用速度-电流双闭环比例积分（PI）控制。研究结果表明，电机能够平滑稳定地启动，整个控制系统具有良好的动态和静态性能。该文的设计方法是行之有效的，具有较重要的工程实践借鉴价值。

英文摘要：

Traditionally,using position sensors to capture rotor position signal is usually applied in brushless DC motor control system.However,the position sensor used will not only limit the usage of brushless DC motor in harsh environ-ment,but also lead to the increase of motor size and the control circuit complexity.In order to overcome these shortcom-ings,in this paper,a brushless DC motor control system without position sensor was designed and manufactured based on the TI＆#39;s Digital Signal Processor （DSP）chip TMS320LF2407A.By detecting the neutral zero-crossing point of motor back,EMF was applied to capture the rotor position signal which makes the motor start through three-steps;pulse width modulation （PWM）was used in controlling converter’s upper bridge while the corresponding lower bridge is always on;and speed-current double closed loop PI regulator was used to control the motor speed.Experimental results show that the motor can start smoothly and stably,and the control system has a good dynamic and static performance.This design method has been proved to be so feasible and effective that it has some engineering significance practically.