Intelligent fractional-order backstepping control for an ironless linear synchronous motor with uncertain nonlinear dynamics

Syuan Yi Chen, Tung Hung Li, Chih Hun Chang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This study aims to develop an intelligent fractional-order backstepping controller to control the mover position of an ironless permanent magnet linear synchronous motor. First, we investigated the operating principle and dynamic modeling of the linear synchronous motor based on the field-oriented control method. Next, to improve the convergence speed and control accuracy of the conventional backstepping controller, we designed a fractional-order backstepping controller that has more degrees of freedom in the control parameters. However, designing the switching control gain is difficult owing to the unknown degree of uncertainty. To address this problem, we proposed an intelligent fractional-order backstepping controller to further enhance the adaptiveness and robustness of the fractional-order backstepping controller. In this intelligent controller, we proposed a Hermite-polynomial-based functional-link fuzzy neural network as an uncertainty estimator that can directly estimate system uncertainty, thereby improving the disturbance rejection ability and requiring no uncertainty bound information. Additionally, to compensate for the estimation error introduced by the estimator, we designed an exponential compensator that employs a smooth exponential self-regulation mechanism. We utilized the Lyapunov theorem to derive estimation laws for the online tuning of the control parameters. Experimental results demonstrate the effectiveness and high positioning performance of the proposed intelligent fractional-order backstepping controller in comparison with the backstepping controller and fractional-order backstepping controller in the linear synchronous motor control system.

Original languageEnglish
Pages (from-to)218-232
Number of pages15
JournalISA Transactions
Volume89
DOIs
Publication statusAccepted/In press - 2019 Jan 1

Fingerprint

synchronous motors
Backstepping Control
Backstepping
Linear motors
Synchronous motors
Fractional Order
Nonlinear Dynamics
controllers
Controller
Controllers
Uncertainty
estimators
Control Parameter
Field Oriented Control
Estimator
Switching Control
Lyapunov Theorem
Motor Control
Disturbance Rejection
Disturbance rejection

Keywords

  • Backstepping control
  • Fractional-order
  • Functional-link fuzzy neural network
  • Hermite-polynomial function
  • Permanent magnet linear synchronous motor
  • Position control

ASJC Scopus subject areas

  • Instrumentation
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

Cite this

Intelligent fractional-order backstepping control for an ironless linear synchronous motor with uncertain nonlinear dynamics. / Chen, Syuan Yi; Li, Tung Hung; Chang, Chih Hun.

In: ISA Transactions, Vol. 89, 01.01.2019, p. 218-232.

Research output: Contribution to journalArticle

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