无轴承异步电机研究与实现

Research and Developments of Bearingless Induction Motors

对无轴承异步电机中悬浮力产生原理 ,以及如何实现电枢转矩和悬浮力解耦控制的工作原理做了简要介绍 ,并提出了以功能强大的高速数字信号处理器 (TMS3 2 0F2 40 )为控制核心的数模混合控制电路。对原理样机的悬浮实验分析表明 ,提出的悬浮系统能够在稳速和变速过程中满足悬浮要求 ,并且转轴的径向位移不超过 5 0 μm。

Bearingless induction motors have been the focus of research work on high speed motors, as its rotor shaft can be suspended by magnetic force without conventional magnetic bearings. Compared with magnetic bearing motors, the axial length of the rotor shaft for bearingless induction motors is decreased, which results in an increase of mechanical resonance frequency in the flexible rotor and high power density. In the paper, the principle of levitation force and the decoupling control of torque and radial force are shown. An analog-digital hybrid controller based on DSP TMS320F240 is proposed. The test results of a prototype motor validate the performance efficacy of the proposed controller in a steady state, as well as in a transient state. And the maximum radial displacement is less than 50 μm.