Search
  Advanced Search
 
Journal search
Journal cover: Kybernetes

Kybernetes

ISSN: 0368-492X

Online from: 1972

Subject Area: Electrical & Electronic Engineering

Content: Latest Issue | icon: RSS Latest Issue RSS | Previous Issues

Options: To add Favourites and Table of Contents Alerts please take a Emerald profile

Previous article.Icon: Print.Table of Contents.Next article.Icon: .

A combined discrete variable structure control algorithm and its application to brushless DC servomotors


Document Information:
Title:A combined discrete variable structure control algorithm and its application to brushless DC servomotors
Author(s):Yanhui Lai, (Department of Electrical Engineering, Naval University of Engineering, Wuhan, China Navy 92323 Unit, Qingdao, China), Xiaofeng Zhang, (Department of Electrical Engineering, Naval University of Engineering, Wuhan, China), Lizhong Song, (Department of Electrical Engineering, Naval University of Engineering, Wuhan, China)
Citation:Yanhui Lai, Xiaofeng Zhang, Lizhong Song, (2010) "A combined discrete variable structure control algorithm and its application to brushless DC servomotors", Kybernetes, Vol. 39 Iss: 6, pp.973 - 979
Keywords:Cybernetics, Discrete control systems, Electric motors, Systems and control theory
Article type:Technical paper
DOI:10.1108/03684921011046744 (Permanent URL)
Publisher:Emerald Group Publishing Limited
Abstract:

Purpose – The purpose of this paper is to overcome the shortcoming that discrete variable structure control (VSC) system trajectory oscillates in a neighborhood of the origin.

Design/methodology/approach – Among all the proposed reaching laws, W. Gao's theory is most perfect. It makes great progress in revealing the motion mechanism of discrete-time VSC systems. However, it has an obvious defect, i.e. the system trajectory oscillates in a neighborhood of the origin rather than converges to the origin. So, a new reaching law named variable rate reaching law to which the stability at the origin can be expected is proposed. The special feature of this new reaching law is that it is directly proportional to the norm of the state vector and can result in a sector-shaped switching region. On the basis of analyzing the characteristic of the variable rate and the conventional reaching laws, a new combined control algorithm that discards the shortcomings of the two reaching laws and carries on their merits is formed, so satisfactory control performance can be achieved.

Findings – A new combined reaching law control algorithm, which uses the exponential rate reaching law in the reaching mode and in the front phase of the sliding mode, and uses the variable rate reaching law in the back phase of the sliding mode and in the steady-state mode, is formed.

Practical implications – The paper is a very useful reference for control system designers.

Originality/value – The new control strategy is applied to the controller design for a brushless DC servomotor and good control performance is obtained.



Fulltext Options:

Login

Login

Existing customers: login
to access this document

Login


- Forgot password?
- Athens/Institutional login

Purchase

Purchase

Downloadable; Printable; Owned
HTML, PDF (78kb)Purchase

To purchase this item please login or register.

Login


- Forgot password?

Recommend to your librarian

Complete and print this form to request this document from your librarian


Marked list


Bookmark & share

Reprints & permissions