差動帰還形パワーアンプを用いたAC磁気浮上 [in Japanese] AC Magnetic Suspension Using a Differential Feedback Power Amplifier [in Japanese]
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This paper proposes a new type magnetic suspension system in which the electromagnet is magnetized by an AC current. The basic idea is a feedback of difference between the exciting current and the applied voltage. The feedback signal is applied to a power amplifier through two phase sifters and a band pass filter. The usefulness is established by the experiments of magnetic suspension. The main merit of this system is that the stable suspension is achieved without a displacement sensor and without a self-sensing controller.
- IEEJ Transactions on Sensors and Micromachines
IEEJ Transactions on Sensors and Micromachines 118(7), 916-921, 1998-07
The Institute of Electrical Engineers of Japan