基于DSP的SVPWM电机变频控制研究

电压空间矢量控制技术就是根据磁链环路控制电压矢量,可以得到逼近圆形的磁链轨迹.电压矢量的合成采用电压脉宽调制技术,高速数据处理器根据电机反馈的位置信号,计算出参考电压矢量,然后通过对高速开关的通断控制,完成相电流的合成.电压空间矢量控制技术可以减小电机低频转矩脉动和谐波电流损耗,达到对速度转矩调整的目的.用该方法能减少逆变器输出电流的谐波成分及电动机的谐波损耗,更有效地利用电源电压,扩展了电动机的调速范围.本文设计了一种基于DSP处理器的电机控制方案,采用SVPWM技术,通过实验证明了该方案的可行性.

Variable frequency control of SVPWM generator based on DSP

Voltage space vector control technology can obtain approximately round magnetism chain orbit.Reference voltage is formed by pulse width modulation.High speed data processor calculates the reference voltage vector by rotor position signal;controls the switches to form the phase current.SVPWM technology can reduce motor's low frequency pulsation and harmonic losses.It can be adopted to adjust the speed torque.It concludes that using voltage space vector will reduce output current harmonics in converter and harmonics losses of motor effectively utilize power voltage and consumedly enlarge speed adjustable scope of motor.In the paper,there is a control scheme based on DSP,and the scheme is validated by experiments.