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ac magnetic suspension using a differential feedback power amplifier
Author(s) -
Moriyama Shinichi
Publication year - 2000
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/(sici)1520-6416(20000430)131:2<61::aid-eej7>3.0.co;2-q
Subject(s) - electromagnet , suspension (topology) , amplifier , control theory (sociology) , signal (programming language) , voltage , electromagnetic suspension , engineering , physics , electrical engineering , materials science , computer science , magnet , mathematics , control (management) , cmos , artificial intelligence , homotopy , pure mathematics , programming language
This paper proposes a new type of 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 shifters and a bandpass filter. The usefulness is established by experiments on magnetic suspension. The main merit of this system is that stable suspension is achieved without a displacement sensor and without a self‐sensing controller. © 2000 Scripta Technica, Electr Eng Jpn, 131(2): 61–67, 2000