Abstract
Most servo control systems generally adopt incremental optical encoders for speed detection when considering cost and performance requirements. For a fixed sampling period, this kind of encoder along with the generally used so-called M method, may degrade the response or even cause the system to become unstable in a low-speed operating region because of the resulting speed detection delay. In this article, a reference model improves low-speed responses; parameter identification by recursive least square error algorithm overcomes the problem of parameter variations and an adaptive proportional-integral control strategy based on the parameter identification results further justifies the proposed method. A digital signal processor based permanent magnet synchronous motor drive will be used to carry out the experimental results, which show the effectiveness of the proposed method.
Acknowledgment
The authors would like to express their appreciation to the National Science Council in Taiwan for their support under contracts NSC 96-2221-E-218-042-MY3 and NSC 98-2623-E-006-002-IT and to the Ministry of Economic Affairs under contract 99-EC-17-A-05-S1-103.