Abstract
Many groups in the world are trying to develop many kinds of artificial heart for severe heart failure patients. We adopted a magnetically suspended motor which contributes device durability and better blood compatibility for the ventricular assist device (VAD). The influence that the size of permanents into the magnetic bearing system gave to the bearing performance was examined in detail by using the numerical magnetic field analysis. The double-bias hybrid magnetic bearing consists of four electromagnets located 90 deg intervals, three ring-shaped permanent magnets and a yoke. The results of numerical analysis show that the size of permanents in the same direction as flux path affects the bearing performance greatly. The comparison between numerical analysis and experiment results indicates to establish design parameter of double-bias hybrid magnetic bearing.
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