Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1996-08-09
1998-08-11
Leja, Ronald W.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361146, B66C 1306
Patent
active
057935980
ABSTRACT:
A magnetically levitated vibration damping apparatus includes a table having a flat board of a magnetic material, an electromagnetic actuator for applying magnetic attractive forces to the flat board to levitate the table, a displacement sensor for detecting relative displacement between the flat board and the electromagnetic actuator, an acceleration sensor for detecting absolute acceleration of the table, and a control system for controlling a current supplied to the electromagnetic actuator based on signals from the displacement sensor and the acceleration sensor according to a first control rule for controlling a gap between the flat board and the electromagnetic actuator based on the signal from the acceleration sensor and a second control rule for controlling vibrations of the table based on the signal from the acceleration sensor, the second control rule including stability control of relative displacement of the table.
REFERENCES:
patent: 5478043 (1995-12-01), Wakui
Transactions of the Japan Society of Mechanical Engineers, Series C, vol. 61, No. 587, pp. 170-176, Jul. 1995, Weimin CUI et al., "Active Micro-Vibration Control System Using Both Air Springs and Magnetic Bearings".
Haga Takahide
Kanemitsu Yoichi
Katamura Ryuta
Mizuno Takayuki
Watanabe Katsuhide
Ebara Corporation
Kajima Corporation
Leja Ronald W.
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