Abstract

This paper proposes a rotary-linear surface-mounted permanent magnet (PM) voice coil motor (RL-SVCM) with PM flux bridges in place of the iron flux bridges in a traditional RL-SVCM for enhancing average torque and force ripple but slight damage of torque ripple and average linear force. The iron flux bridges in a basic RL-SVCM cannot participate in the generation of rotary torque. In contrast, the PM flux bridges in the proposed RL-SVCM can participate in the generation of rotary torque. The magnetic equivalent circuit (MEC) is used to analyze the magnetic circuits of the basic and proposed models. The results explain the reasons for the performance improvements achieved by the proposed motor. The finite element method (FEM) is used to derive the precise output performance of the basic and proposed motors. Additionally, a prototype of the proposed RL-SVCM with PM flux bridges was manufactured for experimental verification. Close agreement between the experimental results and FEM results validates the feasibility of the proposed RL-SVCM.

Highlights

  • The demand for compact, lightweight, and highperformance rotary-linear (RL) motion modules [1]–[3] has increased significantly in the manufacturing industries for semiconductor packaging, medicine, and aviation

  • Motion accuracy and responses are limited by mechanical transmission errors, meaning traditional RL motion modules must be replaced with high-precision, direct-drive, and compact RL motors

  • When the rotor is in the position where the linear coil and center permanent magnet (PM) are in line, the rotary torque ripple of the basic model is 14.9% and that of the proposed model is 15.2%

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Summary

INTRODUCTION

The demand for compact, lightweight, and highperformance rotary-linear (RL) motion modules [1]–[3] has increased significantly in the manufacturing industries for semiconductor packaging, medicine, and aviation. When the rotor is in the position where the linear coil and center PMs are in line, the rotary torque ripple of the basic model is 14.9% and that of the proposed model is 15.2%. B. LINEAR MOTION ANALYSIS Figures 18(a) and 18(b) present the linear force distributions of the basic and proposed models under linear motion distances versus rotary electrical angles. The linear force of the proposed model is 2.9% lower than that of the basic model

PROTOTYPE MANUFACTURING AND EXPERIMENT
Findings
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