In this paper, a self-sensing active magnetic bearing (AMB) with a new PWM amplifier is proposed. This amplifier employs two DC sources: one supplies a control current and the other supplies a bias current. A pair of electromagnets driven by this amplifier also works as a position sensor based on bridge measurement. In the experiment, a rotor running at 45,000 min-1 is suspended by the proposed 5-axis AMB without any position sensors. The experimental system is still stable even if the length of the cables between the PWM amplifiers and the electromagnets is varied within 45 meters.
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