Vibration insulation of a body on magnetic bearings
First Claim
1. In a device for weakening interference forces created during seating of a body on magnetic bearings, the body being movable along at least one translational axis, which device includes a magnetic position control circuit connected between a sensor which provides a signal representing the position of the body relative to the bearings and a control unit having an input and an output for providing a signal to adjust the position of the body relative to the bearings, the control circuit having means defining two integrators, the improvement wherein:
- said means defining two integrators comprise a first integrator and a second integrator each having a signal input and a signal output, said signal output of said first integrator being connected to said signal input of said second integrator so that said first and second integrators constitute a double integration unit, said signal input of said first integrator is connected to receive a signal having a value at least approximately proportional to a force capable of stabilizing the body relative to the bearings along at least one translational axis, and said double integration unit is operative for providing an output signal constituting an actual position value control signal from said control circuit; and
said control circuit further comprises means including a low-pass filter and attenuation members for applying to the inputs of both of said integrators two signals each having a value which is a function of the difference in value between the output signal provided by said double integration unit and the signal provided by said sensor.
1 Assignment
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Accused Products
Abstract
A device for insulating a body on magnetic bearings from vibration of its stator and hence the environment and vice versa. The body may include a rotor which can produce undesirable vibrations during rotation. The position of the body is caused to follow slow movements of the stator, but does not follow higher frequency interference. However, intentional fast position regulating procedures are possible. The device includes a double integrator which generates a largely interference-free position sensor signal for low vibration bearing adjustment which is followed slowly by a true position sensor signal. The device can be used in a flywheel for satellite stabilization where it facilitates adjustment of the angular position while at the same time providing insulation against vibration.
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Citations
16 Claims
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1. In a device for weakening interference forces created during seating of a body on magnetic bearings, the body being movable along at least one translational axis, which device includes a magnetic position control circuit connected between a sensor which provides a signal representing the position of the body relative to the bearings and a control unit having an input and an output for providing a signal to adjust the position of the body relative to the bearings, the control circuit having means defining two integrators, the improvement wherein:
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said means defining two integrators comprise a first integrator and a second integrator each having a signal input and a signal output, said signal output of said first integrator being connected to said signal input of said second integrator so that said first and second integrators constitute a double integration unit, said signal input of said first integrator is connected to receive a signal having a value at least approximately proportional to a force capable of stabilizing the body relative to the bearings along at least one translational axis, and said double integration unit is operative for providing an output signal constituting an actual position value control signal from said control circuit; and said control circuit further comprises means including a low-pass filter and attenuation members for applying to the inputs of both of said integrators two signals each having a value which is a function of the difference in value between the output signal provided by said double integration unit and the signal provided by said sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. In a device for weakening interference forces created during seating of a body on magnetic bearings, which body is rotatable on the bearings about an axis of rotation, is capable of tilting about two tilting axes which are perpendicular to the axis of rotation and can be stabilized about one of the tilting axes by a torque, the device including a magnetic position control circuit connected between a sensor which provides a signal representing the position of the body relative to the bearings and a control unit having an input and an output for providing a signal to adjust the position of the body relative to the bearings, the control circuit having means defining two integrators, the improvement wherein:
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said means defining two integrators comprise a first integrator and a second integrator each having a signal input and a signal output, said signal output of said first integrator is connected to said signal input of said second integrator so that said first and second integrators constitute a double integration unit, said signal input of said first integrator is connected to receive a signal having a value at least proportional to the torque which can stabilize the body about the one tilting axis, and said double integration unit is operative for providing an output signal constituting an actual position value control signal from said control circuit; and said control circuit further comprises means including a low-pass filter and attenuation members for applying to the inputs of both of said integrators two signals each having a value which is a function of the difference in value between the output signal provided by said double integration unit and the signal provided by said sensor. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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Specification