4bstruct -This paper reports a novel high bandwidth moving-coil actuator. A special design in actuator construction leads to generation of pure torque in the actuator. With this special design the lateral quasi-rigid body vibration mode can be substantially suppressed. 2D FEA was carried out for the electromagnetic design to optimize the electromagnetic parameters and dimensions of the actuator. A 3D FEM solver was used to predict the characteristics of mixhanical dynamics of the actuator. The electromagnetic characteristics, mechanical dynamics and performance of the actuator were measured. The results from simulation and experiment match quite well. The results show that the quasirigid body vibration mode is substantially suppressed and the primary resonance frequency is about 10 kHz in the novel actuator.h d e x Terms ---Moving-coil actuator, high-bandwidth, electromagnetic design, dynamics analysis, hard disk drive.

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This paper investigates the influence of physical size of switched reluctance motor on its output performance. Three four-phase switched reluctance motors with different dimensions and power ratings are used for comparison. The magnetic characteristics of each motor are described using 2D finite element method. Field solutions from finite element calculation and analysis combined with the output equation are processed to give the energy conversion loop, v -i trajectory, for each motor. The comparison of the output performance and -i loop for each motor provides the basis for the discussion on the relationship of output performance of switched reluctance motor to its physical size.

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