直流無(wú)刷稀土永磁電動(dòng)機調速系統的設計

直流無(wú)刷稀土永磁電動(dòng)機調速系統的設計
摘 要：無(wú)刷直流電動(dòng)機 (BLDCM)因為具有良好的性能、控制方便和高的性?xún)r(jià)比等優(yōu)點(diǎn)，所以一直得到很廣泛的應用。本文介紹了永磁無(wú)刷直流電動(dòng)機速度控制的一種方案，及當前無(wú)刷直流電動(dòng)機控制的發(fā)展趨勢和常見(jiàn)的新型控制方法。最后采用端電壓過(guò)零檢測法和預定位起動(dòng)方法，實(shí)現了基于 TMS320F240 DSP的無(wú)位置傳感器永磁無(wú)刷直流電動(dòng)機速度控制。
在系統的硬件設計中，設計了以TMS320F240數字信號處理器為核心處理器的最小系統。同時(shí)也設計了信號采集電路，用于測量控制系統所需的三個(gè)定子端電壓信號和相電流反饋信號。
在系統的軟件設計中，主要完成了電動(dòng)機的起動(dòng)及無(wú)傳感器速度閉環(huán)控制兩大功能。用DSP成功實(shí)現PWM輸出信號、信號采集及移相控制等功能。
關(guān)鍵詞：數字信號處理器（DSP）；無(wú)刷直流電動(dòng)機；轉子位置傳感器；
反電動(dòng)勢；速度控制The design of speed control system of Rare-earth Permanent Magnet Brushless DC Motor
Abstract：The Brushless DC Motor(BLDCM) has been widely used for many years because of its excellent performance, easy control and high cost effectiveness.This paper introduces the control of Brushless Permanent Magnet DC Motor ,and introduces the future of the control BLDCM; and some new methods in controlling DC motor. In the end, a complete solution proposal in the paper. It deals with sensor less alternative. To position sensors for speed control in Brushless Permanent Magnet Dc Motor based on TMS320F240,using the back-EMF. Commutation method and the start method by means of rotor pre-setting.
TMS320F240DSP has been designed as the main micro-controller during hardware design. Minimum system. Circuits for signal collection have been given to measure the stator terminal voltage and current value.
When designing the software, the main two functions, startup of the motor and speed closed loop sensor less control are complete. Using DSP, the PWM signal, the measurement of voltage and current signals and phase shifting are successively presented here.
Keywords： DSP(Digital Signal Processing); BLDCM(brushless direct current motor);Rotor Position Sensor; BEMF(Back Electromagnetic Force);Speed Control.

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