Force Ripple Reduction Methods for Tubular Permanent Magnet Linear Machines

Articles in Press

Document Type : Research Article

Authors

1 1School of Electrical and Computer Engineering, University of Hormozgan, Bandar-Abbas, Iran.

2 Faculty of Electrical Engineering Department of Sharif University of Technology

Abstract

This paper presents some novel force ripple reducing techniques for tubular permanentmagnet

linear machines (TPMLMs) with the square-shaped cross section. These methods are very

straightforward, so their implementation in TPMLMs with the square cross section is easy. An

analytical form of machine parameters such as the thrust force is obtained by solving the analytical

field. A modular configuration for permanent-magnet pole is used to reduce teeth cogging

force. Furthermore, the manufacturing cost of TPMLMs can be reduced by using modular pole

permanent-magnet. In this method, the width of permanent-magnets (PMs) is calculated by using

Fourier analysis and a sensitivity analysis has been conducted to identify the robustness of this

technique. Additional stator side methods are used to decrease the end face cogging force. Moreover,

the stator teeth shifting method is proposed to reduce the electromagnetic force ripples. Also,

the produced electromagnetic force of the machine is increased by using a delay in the power supply.

3 -D non-linear finite-element analyses and experimental tests are performed to investigate

the effectiveness and performance of proposed techniques.

Keywords

Main Subjects

Scientia Iranica

Articles in Press, Accepted Manuscript
Available Online from 13 December 2025

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History

  • Receive Date: 06 October 2022
  • Revise Date: 28 February 2023
  • Accept Date: 16 August 2023

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