Structure Optimization Design Of The Permanent Magnet Voice Coil Motor Based On 3D Magnetic Field Calculation

Voice Coil Motor (VCM) is a special type of linear electric machinery, which is similar to thevoice coil of loudhailer in work principle. The VCM possessing advantages of small-volume,light-weight and fast-action can achieve high orientation precision and equality impetus. It hasbeen adopted in disk drivers of computer, spaceflight apparatuses, precise range finder, exactlathe and mobile telephone widely since the VCM was excogitated. At present, the VCM existwidely in consumption and production market, especially in the top grade home electricalappliance and computer market.The permanent-magnet VCM design and configuration optimization have been studied based onthe existing process technics in order to solve the shortage of VCM design presently and theproblem of underproduction. The main work and research results are as follows:Firstly, the VCM work theory has been introduced, and the different configuration andcorresponding trait of these styles has been presented, such as the inner-magnetism motor and theouter-magnetism motor, the long-travel motor and short-travel motor, the coil-move style andmagnet-move style, the linear motor and the rotary motor, and so on. The purpose of momentconstant and the influence to the performance of motor has been expatiated. And the typicalapplications of VCM in CD-ROM drivers, hard-disk drives and the test-bed of electric-brushwhere VCM provides static pressure have been introduced in details.Secondly, the simulation software ANSYS has been used in the simulative discussion ofelectromagnetic field, based on the basic theory of VCM. The Finite Element Method (FEM) andits application in the simulation of electromagnetism have been introduced. The VCM simulationmodel has been set up, and the calculations have been finished based on application examples.Thirdly, the design process of permanent-magnet VCM has been introduced in details. Somedesign method has been brought forward for reference, for example, the quantitative calculation,which includes the material choice of the permanent-magnet, the volume reckoned and thecoil-circle computation and type choice of coil, and the holistic structure design in mechanism.Lastly, several configuration optimization schemes have been put forward based on thefundamental of VCM design. The electromagnetism and performance simulation studies of theseconfigurations have been finished respectively using ANSYS software. Several projects havebeen discussed in this thesis, such as the difference between the single-excitation structure usingNd-Fe-B permanent-magnet and the conventional double-excitation structure using ferrite, theinfluence on performance of adding a pole-boot in VCM, the shorted turn effects on the dynamicrespond velocity of VCM, and etc.