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Position-controlled electromagnetic assembly

  • US 5,064,285 A
  • Filed: 05/25/1990
  • Issued: 11/12/1991
  • Est. Priority Date: 05/25/1990
  • Status: Expired due to Term
First Claim
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1. An electromagnetic assembly, comprising:

  • a housing;

    an electromagnetic device having at least one end enclosed by said housing and having its longitudinal axis oriented along a first orthogonal axis with respect to said housing;

    mounting means pivotally mounting said electromagnetic device to said housing permitting pivotal movement of said electromagnetic device about second and third orthogonal axes with respect to the housing, and preventing rotary movement of said electromagnetic device about said first longitudinal axis;

    a magnetic body secured to said electromagnetic device at the end thereof enclosed by said housing and producing a magnetic field coaxial with said first orthogonal axis;

    first coil means secured to said housing so as to be magnetically coupled to said magnetic body and oriented such that current through said first coil means produces a magnetic field along said second orthogonal axis;

    second coil means secured to said housing so as to be magnetically coupled to said magnetic body and oriented such that current through the second coil means produces a magnetic field along said third orthogonal axis; and

    a current source for applying electrical current to said first and second coil means such that the magnetic fields produced thereby, interacting with the magnetic field produced by said magnetic body, produce a torque controlling the position of said electromagnetic device with respect to said second and third orthogonal axes;

    said current source applying the current to said first and second coil means in pulses having pulse widths corresponding to the torque to be applied to the electromagnetic device.

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