Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2007-08-30
2010-06-15
Leung, Quyen (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S06800R, C310S06800R, C361S143000, C318S108000, C318S632000
Reexamination Certificate
active
07737590
ABSTRACT:
Problem of the present invention is to enable elimination or reduction of a signal wire in a dedicated cable for a magnetic bearing device for supplied an electric power from a control device to a magnetic bearing main unit via the dedicated cable. A magnetic bearing device100according to the present invention has a magnetic bearing main unit10having an electromagnet12M for magnetically levitating and rotatably supporting a magnetic rotating body11and functioning as a magnetic bearing, a control device20having a compensating circuit25for generating a control signal for controlling a levitation position of the magnetic rotating body11, and an electricity supply line30L for supplying an electric power from the control device20to the magnetic bearing main unit10. The magnetic bearing main unit10has a modulation carrier circuit22for generating a modulated wave and a first alternating-current coupling section23A for transmitting the generated modulated wave to the control device20by the alternating-current coupling with the electricity supply line30L. The control device20has a second alternating-current coupling section23B for separating the modulated wave alternating-current coupled from the electricity supply line30L and a carrier wave demodulating circuit24for detecting the separated carrier signal wave.
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Ebara Corporation
Leung Quyen
Scheuermann David W.
Westerman Hattori Daniels & Adrian LLP
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