无轴承永磁同步电机的驱动及数字控制研究

Study on Power Drive and Digital Control of Bearingless Permanent Magnet Synchronous Motor

首先,阐述了无轴承电机径向悬浮力产生机理,在此基础上推导出转子径向悬浮力和电磁转矩数学表达式,并构建了基于电压空间矢量的转子磁场定向的控制系统。其次,以数字控制芯片TMS320F2812设计电机控制软件,同时采用智能功率模块IPM构建了电机功率逆变模块。最后,设计了表贴式无轴承永磁同步电机试验样机,并对其展开了悬浮试验研究。通过对实验结果进行分析,可以得出以下结论:采用id=0的转子磁场定向控制方法能够实现无轴承电机的解耦控制,设计的功率逆变电路和软件控制系统性能优良,试验样机可以正常旋转和稳定悬浮。

Firstly, the generation principle of radial suspension force was described, and the mathematical expressions of rotor radial suspension force and electromagnetic torque were derived. The rotor field oriented control system based on voltage space vector was constructed. Secondly, motor digital control system was designed with TMS320F2812 digital control chip. At the same time, the motor power inverter module was constructed using intelligent power module IPM. At last, a surface-mounted BPMSM test prototype was designed, and the study of suspension test was performed. By analyzing the experimental results, it was confirmed that the rotor field oriented control method for id = 0 was adopted to realize the decoupling control of the motor, power inverter circuit and software control system have good performance and the experimental prototype can be normal rotation and stable suspension.