考虑电流动态的无轴承异步电机解耦控制策略

Decoupling control strategy of bearingless induction motor under the conditions of considering current dynamic characteristics

目前的无轴承异步电机解耦控制策略没有考虑定子电流动态影响,限制了其控制性能的提高.为此,本文首先分析了电机的数学模型,在考虑转矩系统定子电流动态的前提下,建立了无轴承异步电机的状态方程;在系统可逆性分析的基础上,解析推导出了无轴承异步电机的逆系统动态数学模型;基于逆系统方法,研究了转速、转子磁链和两个径向位移分量之间的动态解耦控制策略.仿真研究结果表明:控制系统具有优良的动态解耦性能和较强的抗负载挠动能力.所提出的解耦控制策略是有效的、可行的,并可在一定程度上简化控制系统结构.

For the influence of stator current dynamics not being considered in the existing decoupling control strategy,the improvement of control performance of bearingless induction motor has been limited.To solve the problem,the dynamic model of bearingless induction motor is analyzed firstly.Then,under the conditions of taking the stator current＇s dynamic characteristics of torque system into account,the state equations of bearingless induction motor has been established.Under the foundation of reversibility analysis,the inverse model of bearingless induction motor has been derived;based on the inverse system method,the dynamic decoupling control strategy between motor speed,rotor flux linkage of torque system,and two radial displacement components of suspension system,has been researched.Simulation results have shown that the control system of bearingless induction motor not only owns higher dynamic decoupling control performance,but also owns stronger anti-interference ability.The presented decoupling control strategy is effective and feasible;adopting the proposed control strategy,the control system of bearingless induction motor can be simplified to some extent.