A Robust Adaptive Sliding Mode Control for PMLSM with Variable Velocity Profile Over Wide Range

Payam Ghaebi Panah,Arash Kiyoumarsi,Ahmad Shafiei,Behzad Mirzaeian,Mohammd Ataei

doi:10.19026/rjaset.10.1866

Abstract

An adaptive robust variable structure speed controller is designed for wide range of desired velocity control of a Permanent Magnet Linear Synchronous Motor (PMLSM). This is performed for comprehensive nonlinear model of PMLSM including non-idealities such as detent force, parameter uncertainty, unpredicted disturbance and nonlinear friction. The proposed method is based on the robust Sliding Mode Control (SMC) in combination with an adaptive strategy for a wide range of velocity. The simulation results are provided for the above mentioned comprehensive model of PMLSM with a variable velocity profile. Moreover, as an evaluation criterion, a Proportional-Integral (PI) controller is designed whose parameters are optimally tuned by the Particle Swarm Optimization (PSO) algorithm for better comparison.

Highlights

Nowadays, great merits of permanent magnets with reasonable price have appealed engineers to enhance traditional electrical machines
The description of Permanent Magnet Linear Synchronous Motor (PMLSM) by electrical relations in the form of an equivalent circuit was proposed; it is not widespread and practical (Lin et al, 2011). Another model is based on Causal Ordering Graph (COG), which precisely illustrates the interactions between the fluxes and the currents of PMLSM but it is not still straightforward (Jia et al, 2003)
Non-idealities such as detent force, parameter uncertainty, unpredicted disturbance and nonlinear friction were taken into account to obtain a comprehensive nonlinear model of the PMLSM

Summary

Introduction

Great merits of permanent magnets with reasonable price have appealed engineers to enhance traditional electrical machines. As the dark side, it suffers from a positional dependency in the thrust force that is called detent force. This force arises from the interaction of the permanent magnets and the ferromagnetic core. This undesirable force appears even in the windings without current. The force ripple of the PMLSM is larger than that of rotary motors because of the finite length of the mover and the wide slot opening. The force ripples change periodically as the mover advances during its motion. All flux linkage harmonics, cogging harmonics and time harmonics are involved in force ripples

Objectives

Methods

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Conclusion