Magnetic Bearing Device With Simplified Wiring
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Accused Products
Abstract
A magnetic hearing device and a method of operation for such a device are provided. The device comprises a group (410) of electromagnetic actuators (411, 412, 413, 414). Each actuator is electrically connected to an amplifier unit (701). The actuators of a first subgroup are connected to a first common node (608), while the actuators of a second subgroup are connected to a second common node (609). The common nodes (608, 609) are connected either directly or through means like an additional actuator. Preferably the common nodes (608, 609) have no additional electrical connection to the amplifier unit. According to a special embodiment of the invention, each subgroup of actuators consists of only one single actuator and the common node has an electrical connection to the amplifier. Thus the device comprises two actuators in a series configuration connected to an H bridge. The common node may be connected to either of two different voltages. The invention enables simplified wiring without increased load requirements for the wires.
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Citations
32 Claims
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1-14. -14. (canceled)
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15. A magnetic bearing device for supporting an object magnetically, comprising:
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an amplifier unit, and at least one group of electromagnetic actuators for controlling a number of degrees of freedom of the object, where the number of actuators in said group is at least three, each actuator in said group of actuators having a first port and a second port for providing a current to said actuator, the first port of each actuator in said group of actuators being connected to said amplifier unit, wherein said group of actuators is divided into a first subgroup and a second subgroup of actuators, the second port of each actuator in the first subgroup being connected to a first common node and the second port of each actuator in the second subgroup being connected to a second common node, wherein said first common node and said second common node are electrically connected by a node connection means, and wherein said amplifier unit is adapted to control said currents through said actuators in such a way that the sum of currents through each subgroup always flows in the same direction. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method of operation of a magnetic bearing device for supporting an object magnetically, said magnetic bearing device comprising an amplifier unit and at least one group of electromagnetic actuators for controlling a number of degrees of freedom of the object, where the number of actuators in said group is at least three, each actuator in said group of actuators having a first and a second port for providing a current to said actuator, the first port of each actuator in said group of actuators being connected to said amplifier unit, said group of actuators being divided into a first subgroup and a second subgroup of actuators, the second port of each actuator in the first subgroup being connected to a first common node and the second port of each actuator in the second subgroup being connected to a second common node, said method comprising:
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electrically connecting said first common node and said second common node by a node connection means, and providing currents to said actuators in such a way that the sum of currents through each subgroup always flows in the same direction. - View Dependent Claims (27, 28, 29)
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30. A magnetic bearing device for supporting an object magnetically, comprising:
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an amplifier unit, and a pair of electromagnetic actuators, each said actuator having a first and a second port for providing a current to said actuator, wherein said second port of said first actuator and said first port of said second actuator are connected to a common node, wherein each of said first port of said first actuator, said second port of said second actuator and said common node is connected to said amplifier unit, and wherein said amplifier unit is adapted for providing a current to said first port of said first actuator in a first predetermined direction, a current to said second port of said second actuator in a second predetermined direction opposite to said first predetermined direction, and a current to said common node in any of said directions. - View Dependent Claims (31, 32)
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Specification