Magnetic circuit optimization of linear dynamic actuators

Laszlo Kazup,Angela Varadine Szarka

doi:10.21014/acta_imeko.v10i3.1064

Abstract

<p class="Abstract">Contactless braking methods (with capability of energy recuperation) are more and more widely used and they replace the traditional abrasive and dissipative braking techniques. In case of rotating motion, the method is trivial and often used nowadays. But when the movement is linear and fast alternating, there are only a few possibilities to break the movement. The basic goal of research project is to develop a linear braking method based on the magnetic principle, which enables the efficient and highly controllable braking of alternating movements. Frequency of the alternating movement can be in wide range, aim of the research to develop contactless braking method for vibrating movement for as higher as possible frequency. The research includes examination and further development of possible magnetic implementations and existing methods, so that an efficient construction suitable for the effective linear movement control can be created. The first problem to be solved is design a well-constructed magnetic circuit with high air gap induction, which provides effective and good dynamic parameters for the braking devices. The present paper summarizes the magnetostatics design of “voice-coil linear actuator” type actuators and the effects of structure-related flux scattering and its compensation.</p>

Highlights

In the field of manufacturing, many methods of lifetime testing are used
In case of traditional practice test methods, an operator works with the device under test (DUT), he/she cuts, sands, or planes different materials
Research of braking method for fast alternating linear movements by using contactless magnetic methods is in the focus of our project

Summary

Introduction

In the field of manufacturing, many methods of lifetime testing are used. In case of electronic devices, the stress- and lifetime testing is quite simple in most cases compared to the mechanical tests, when mechanical load emulation is very difficult and expensive. The original goal of the project was to develop a special magnetic brake which can simulate the real operation of an electric jig saw to replace the traditional practice test method in which operators perform the full test process by cutting different types of material such as wood, steel, aluminium, etc. The repeatability of this test method is very low, as well as the reliability of the documented test circumstances. The second part of paper presents the results of dynamic simulations, by which dynamic behaviour (relationship between the current and the force in dynamic cases, eddy current- and solid losses, etc.) of the voice coil-type actuator is analysed

Objectives

Methods

Findings

Conclusion