基于SVPWM的无轴承永磁同步电机转子磁场定向控制系统研究

无轴承永磁同步电机是一复杂的强耦合非线性系统,建立精确的电磁转矩和径向悬浮力数学模型是设计无轴承永磁同步电机控制系统的前提,实现径向悬浮力与电磁转矩之间的解耦是电机稳定运行的基础。文中在引入机械/电气坐标系的基础上,建立了电机的精确数学模型。采用基于SVPWM的转子磁场定向控制策略来实现无轴承永磁同步电机的解耦控制。在此基础上构建了控制系统框图和试验平台,设计了该控制系统的软件结构,最后实验验证了该控制方法的有效性。

Study on rotor field oriented control system of bearingless PMSM based on SVPWM

The bearingless PMSM is a strong-coupled complicated nonlinear system, establishing exact mathematical models of electromagnetic torque and radial suspension forces is premises condition for designing control system of bearingless PMSM, and the decoupling control of radial suspension force and electromagnetic torque is the base of stable operation of the motor. On the basis of introducing mechanical and electrical coordinates, the exact mathematical models of the motor arc established. In order to realize decoupling control of bearingless PMSM, the rotor flux orientation control strategy based on SVPWM is adopted in the paper. On this basis, the diagram of control sys-tem and experimental platform are constructed and software structure of this control system is designed. Finally, the experimental results show the validity of the control method.