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Transactions of the Institute of Measurement and Control
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Article

A speed control for PMSM using finite-time feedback control and disturbance compensation

Shihua Li*, Huixian Liu, and Shihong Ding

School of Automation, Southeast University, Nanjing, P.R. China

* To whom correspondence should be addressed. E-mail: lsh{at}seu.edu.cn.


  Abstract

The speed-regulation problem for a permanent-magnet synchronous motor (PMSM) servo system is studied in this paper. In order to improve the disturbance rejection property of the PMSM, a novel composite controller for the speed-loop is presented. First, an extended state observer (ESO) is introduced to estimate the disturbances of the system. The estimated value is used in the feed-forward compensation design. Second, a continuous feedback-based finite-time control technique is employed for the feedback design. The composite speed controller can be considered as a composition of finite-time proportional feedback plus feed-forward compensation based on ESO (FTP + ESO). Two standard proportional–integral (PI) controllers are employed for two current loops. The closed-loop system of the speed error can be regarded as a first-order finite-time control system with bounded disturbances. Rigorous analysis shows that the proposed scheme can enhance the disturbance rejection property of the closed-loop system. Simulation and experimental comparisons with two other control methods, ie the composite control method with proportional feedback plus feed-forward compensation based on ESO (P + ESO), and the PI control method, are given to verify the effectiveness of the proposed method.

First published on September 8, 2009
Transactions of the Institute of Measurement and Control 2009, doi:10.1177/0142331209339860
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