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Modelling, Simulation and Experimentation of PM Spring

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This paper presents modelling, simulation and experimentation of Permanent Magnet (PM) spring that is proposed as a replacement to the traditional mechanical coil spring in automotive suspension. Such a PM spring consists of a number of concentric PM rings of opposing magnetic fields. The main focus of this work is to develop analytical model to predict the magnetic flux density in the air gap between the faces of the PM rings and to calculate the total repulsive force between a set of PM rings. A 3D Finite Element (FE) model for PM spring is developed to obtain accurate repulsive force and compared with the analytical results. Matlab/Simscape model is developed for the complete PM spring and compared with the existing mechanical coil spring. A special test rig is developed for testing the PM spring and the mechanical coil spring. Experimental results for acceleration, velocity and displacement of the sprung mass using PM spring and mechanical coil spring are obtained. Accuracy of the analytical model is validated using experimental data and simulation results.
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Permanent Magnet Spring; Suspension Matlab/Simscape Model; FE PM Simulation

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