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Vibration insulation of a body on magnetic bearings

  • US 5,306,975 A
  • Filed: 11/06/1992
  • Issued: 04/26/1994
  • Est. Priority Date: 05/08/1990
  • Status: Expired due to Fees
First Claim
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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:

  • 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.

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