Design and Optimization of a Homopolar Permanent-Magnet Linear Tubular Motor Equipped With the E-Core Stator

Abstract

In this study, a new homopolar permanent-magnet (PM) linear tubular motor is designed, analyzed and optimized. Firstly, a mechanical structure of the linear oscillating motor (LOM) is proposed and the main working principles are introduced. A basic dynamic mathematic model of the motor is given. Secondly, the magnetic circuit of the motor is analyzed and equivalent magnetic modes are obtained to estimate the magnetic characteristic and force outputs. Thirdly, optimizations including the tooth stricter of the E-core stator, the size of the PM and the air gap length are carried out to improve the force output performance of the motor, increasing force outputs and reducing force ripples during the stroke. Finally, the motor prototype is manufactured according to the design and experimental tests involving force outputs and working efficiency are measured. The average force output and efficiency of the motor can achieve 60 N and 67 %, respectively. Results obtained by finite element method (FEM) and experiments prove the correctness of the design and the effectiveness of the LOM.

Analyzing the Design and Performance of a DC Linear Stepper Motor

“…Each type has its own advantages and disadvantages depending on the practical usage scenario. Moving coil linear motors have a simple structure, but their wiring, which is wrapped around the moving part, can be less secure, and dissipating the generated heat can be challenging [9,14]. Moving iron linear motors are durable and inexpensive, but their primary weakness is their low efficiency.…”

Review of moving magnet linear oscillating actuators for linear compressor application

“…An outsized amount of energy is consumed by the compressors within the refrigerators. A high-performance compressor will save a significant amount of energy (Chen et al, 2020;Zhang et al, 2020;Wei et al, 2020;Xue et al, 2018;Xu et al, 2020;Park et al, 2017;Zou and Cheng, 2019;Sandhya and Rao, 2016;Zhang et al, 2013;Redlich et al, 1996). A piston in conventional reciprocating pumps or compressors typically involves both rotary as well as linear motions.…”

Design and Modeling of a Robust Sensorless Control System for a Linear Permanent Magnet Synchronous Motor

“…Due to their enhanced dynamics compared with the rotary machines in specific applications as mentioned earlier, linear motors were given great concern from the designers to fulfill specific needs [20][21][22][23][24][25][26][27][28][29]. For example, in [20], the design of a transverse-flux linear tubular machine type was presented to harvest a higher force density; the finite element method (FEM) was utilized for this purpose.…”

“…In [23], a tubular-transverse flux linear motor was optimally designed in order to reduce the cogging force. In [24], the authors utilized the FEM method to optimally design a homopolar linear tubular motor via analyzing the magnetic motor circuit and its relevant magnetic behaviors. In [25], a linear tubular PM synchronous generator was designed and tested using a 3D FEM analysis.…”