A rotary-type voice coil motor (VCM) is widely used as a high-speed and accurate positioning actuator in hard disk drives (HDDs). The VCM is playing an important role in track seeking and track following. As the data storage density increases and the size of devices decreases, the performance of VCM needs to be improved. In this study, we will propose a VCM with a new magnetic circuit, a multisegmented magnet array, which can generate higher flux density than the conventional magnet array. High flux density in a VCM makes the actuating force higher and the seek time shorter. Finite element analysis (FEA) results show that the flux density in the MSMA VCM can be increased by 11.3% compared with that of the conventional VCM without any change in the total size of VCM and the parameters of coil.
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