基于SVPWM的无刷直流电机矢量控制系统研究

针对方波控制下无刷直流电机（BLDCM）起动抖动明显、转矩脉动大、噪声大等问题,提出了基于空间电压矢量脉宽调制技术（SVPWM）的正弦波驱动无刷直流电机的方法,分析推导了BLDCM在d-q坐标系下的数学模型,定性分析了矢量控制下交轴电流（iq）的变化.介绍了电压空间矢量控制的基本原理及其控制算法,利用Matlab7.0/Simulink建立了系统仿真模型.仿真结果表明,电压空间矢量控制下的无刷直流电机控制系统具有良好的静、动态特性;同时将仿真结果与方波控制得到的结果进行比较,证明了无刷直流电机在不同负载下通过矢量控制可以实现低转矩纹波、运动平滑、起动迅速、效率高的运行效果.

Research of vector control system of BLDCM based on SVPWM

Aiming at the problems of start shaking,large torque ripple and loud noise of brushless direct current motor（BLDCM） under the control of square-wave,the sinusoidal current drive based on space vector pulse width modulation （SVPWM） method was proposed,the mathematical model of BLDCM in d-q coordinates was deduced and the variation of quadrature axis current（iq） in vector control were qualitatively analyzed.The basic principle and control algorithm of voltage space vector control was introduced and the simulation model of system with Matlab7.0/Simulink was established.The results indicate that vector control system of BLDCM based on SVPWM has good static and dynamic characteristics;At the same time,the simulation results compared with the results under control of square wave indicate that BLDCM under different loads by vector control can achieve low torque ripple,smooth movement,starting fast and high efficiency running effects.