电主轴上改善性直接转矩控制的振动实验

Vibration test of improved direct torque control on electrical spindle

摘要:

针对电主轴控制性能改善的迫切需求，在经典的直接转矩控制(direct torque control，DTC)中融入空间矢量脉宽调制(space vector pulse width modulation，SVPWM)控制技术，给出其改善性的控制算法.定子磁链空间位置与Park逆变换后的u_d和u_q作为输入，利用SVPWM控制技术转换成逆变器的三相电压量，进而有效地控制电主轴；对电主轴上的定子磁链进行近似圆形轨迹的调制，计算出实验所需的离散数据.使用DSP和IGBT模块搭建了硬件实验电路，对电主轴进行电磁振动速度及加速度实验，实验结果表明：3个方向振动速度在不同运行频率、特别是100~450 Hz的转矩脉动明显减小，各向振动加速度的振动幅值明显减小，表明DTC融入SVPWM后，系统的控制性能得到改善，不仅改善了系统的动态性能，也减小了电磁磁链和电磁转矩的脉动.

Abstract:

Aiming at the urgent requirement to improve the control performance of electric spindle, an improved control algorithm is given after integrating SVPWM (space vector pulse width modulation) technology into classical DTC (direct torque control). Stator flux linkage space position and u_d, u_q after Park inverse transformed are taken as the three inputs, and then converted into three phase voltage of dc-to-ac inverter to control the electric spindle efficiently under SVPWM control technology. By modulating the stator flux linkage running approximate circular trajectory on the electric spindle, the discrete data required for the test is calculated. After establishing the hardware circuit using DSP and IGBT module, the experiments of electric spindle electromagnetic vibration velocity and acceleration are conducted, and the experimental results show that the torque ripple obviously decreases in three directions of vibration velocity of each operation frequency, especially at 100-450 Hz the vibration amplitude of vibration acceleration significantly reduces in three directions. These verify that the control performance is improved by integrating SVPWM into DCT.