Electromagnetic attraction type magnetic bearing and control method thereof
AssigneeIHI Corporation
InventorGen Kuwata
Life of this patent
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Abstract
An electromagnetic attraction type magnetic bearing includes at least a pair of electromagnets (1, 2) arranged to face each other, a float (3) arranged between the electromagnets and held at the middle position thereof, a sensor (4) for detecting the displacement of the float (3) from a balance position, and/or the speed thereof, and a controller (5) for controlling the electromagnets (1, 2). The controller (5) determines a variable Z proportional to acceleration in the control direction from the displacement and speed of the float (3), and operates to set the control current of one of the electromagnets to zero and to control only the control current of the other of the electromagnets, depending on the positive and negative values of the variable.
Claims5
An electromagnetic attraction type magnetic bearing comprising:
- at least a pair of electromagnets arranged to face each other,
- a float arranged between the electromagnets and held at the middle position thereof,
- a sensor for detecting a displacement of the float from a balance position, and/or the speed thereof, and
- a controller for controlling the electromagnets,
- wherein the controller determines a variable Z proportional to acceleration in the control direction based on the displacement and the speed of the float, and operates to set a control current of one the pair of the electromagnets to zero and to control only a control current of the other of the pair of the electromagnets, depending on positive and negative values of the variable Z.
A control method of an electromagnetic attraction type magnetic bearing which holds a float arranged at a middle position between a pair of electromagnets arranged to face each other by at least the pair of electromagnets, the control method comprising:
- detecting the displacement of the float from a balance position, and/or the speed thereof,
- determining a variable Z proportional to acceleration in the control direction from the displacement and the speed of the float, and
- operating to set the control current of one the pair of the electromagnets to zero and to control only a control current of one the pair of the electromagnets, depending on positive and negative values of the variable Z.
Dependencies are inferred from the claim text.