无轴承永磁电机悬浮波动抑制策略  

Constraint Strategy of Levitation Fluctuation in Bearingless Motors

作　　者：丁强[1] 王晓琳[2] 

机构地区：[1]南京工业职业技术学院电气与电子工程学院,江苏南京210046 [2]南京航空航天大学自动化学院,江苏南京210016

出　　处：《电气传动》2012年第8期6-9,共4页Electric Drive

基　　金：国家自然科学基金资助项目(50977043)

摘　　要：无轴承电机运行过程中不可避免地产生悬浮波动。悬浮波动过大会影响电机性能,有效抑制悬浮波动是保证电机正常工作的关键。考虑到无轴承电机悬浮控制常用的PID控制算法对扰动抑制针对性不强的缺点,在分析悬浮波动源和常规观测算法不足的基础上,以一种交替极无轴承永磁电机为研究对象,提出利用线性扩张状态观测算法对电机悬浮转子径向扰动加速度进行观测。通过分析扰动加速度与电流控制量之间的关系,提出等效扰动电流的概念。将等效扰动电流补偿到悬浮控制算法中以抑制悬浮波动。与仅采用PID控制算法相比较,仿真结果表明所提控制策略能够抑制悬浮波动,实现电机稳定悬浮。The levitation fluctuation is unavoidable when bearingless motor is working . The motor＇s work- ing performance can be affected if the levitation fluctuation is large. It is vital to constrain the levitation fluctu- ation for the motor working. A kind of consequent-pole bearingless permanent magnet-type motor was studied and levitation fluctuation sources and disadvantages of conventional observer were analyzed. Because the nor- mal adopted levitation control algorithm PID is not good at anti-disturbance,linear extended state observer was proposed to observe the radial disturbance acceleration of motorts rotor. A conception of equivalent disturbance current was proposed based on the relationship between disturbance acceleration and value of control current. The equivalent disturbance current was introduced in levitation control to constrain levitation fluctuation. The simulation results show the proposed strategy can constrain levitation fluctuation and achieve steady operation when it is comparison with using PID controller only.

关 键 词：无轴承电机 扰动加速度观测器 等效扰动电流 悬浮波动抑制 

分 类 号：TM301[电气工程—电机]