The objective of this paper is to propose a compact method using a novel bias magnet to induce an axial bias-magnetic force in order to reduce the radial vibration of a magnetic bearing (MB) motor. After applying the bias-magnetic force, the optimal radial vibration of the developed MB motor is only around 0.197 g (peak-peak, 1 g = 9:8 m/s 2 ) when the natural frequency of the bias magnet reaches the resonant frequency of 62 Hz. In this optimal condition, the ratio in the radial vibration of

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... MB motor with the bias-magnetic force to the original one is around 89%, and the driving power of 0.24 W is saved. Index Terms-Bias-magnetic force, magnetic bearing (MB), radial vibration, preload.