无轴承异步电机的转子磁场定向控制

由于无轴承异步电机是一个强耦合的复杂非线性系统，因此其所采用的基于转矩绕组气隙磁场定向的控制算法存在在着一些局限性，诸如控制运算量较大，固有的最大转矩限制以及难于实现自适应控制等。基于此，提出了一种基于转矩绕组转子磁场定向的控制算法，由于转子磁场定向控制的引入，调速性能得以保证，而且使用中更具灵活性（如便于实现自适应控制等），另一方面，径向悬浮控制所需的转矩绕组气隙磁链值可以在转子磁场定向控制的基础上通过系统辨识获取，这样转子稳定的悬浮也能同样得出保证，实验证明了文中提出的控制算法的有效性。

THE NONLINEAR CONTROL OF BEARINGLESS INDUCTION MOTORS BASED ON THE MOTOR ROTOR FLUX ORIENTATION

The bearingless induction motor is a strong coupled complicated nonlinear system. Much limitation such as great amount control computation, inherent pull-out torque and difficulty in realizing the adaptive control, exists in the control algorithm based on airgap flux orientation of motor winding for the bearingless motor. In this case, a nonlinear control algorithm based on rotor flux orientation of motor winding is proposed. With this control method, the speed regulation performance and flexibility in usage can be improved, for example,it can be driven by a general-purpose inverter. The stable levitation can also be assured because the needed information about the air gap flux linkage of motor winding in the radial levitation controller can be obtained by system identification. The validity of proposed algorithm is proved by experiments.