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Moving coil electrical instrument

  • US 4,039,944 A
  • Filed: 04/08/1976
  • Issued: 08/02/1977
  • Est. Priority Date: 04/08/1976
  • Status: Expired due to Term
First Claim
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1. A moving coil electrical meter mechanism which comprises:

  • a substantially rectangular coil;

    a magnetic structure surrounding first, second, and third sides of the coil and defining first, second, and third magnetic flux filled air gaps whereinthe first and third sides of the coil are opposing sides of the rectangle and are located in the first and third air gaps, respectively, said first and third air gaps having therein oppositely-directed magnetic fields which are substantially perpendicular to said first and third coil sides, andthe second side of the coil, lying between the first and third sides, is located in the second air gap, said air gap having therein a magnetic field which is substantially perpendicular to said second coil side and orthogonal to the fields in the first and third air gaps, said magnetic field in said second air gap further having a direction such that the force exerted on the side of the coil located in the second air gap is in the same direction as the forces exerted on the sides of the coil located in the first and third air gaps, said magnetic structure comprisingfirst, second, and third permanent magnets each having a different orientation, anda core assembly of magnetically permeable materials magnetically connected to said first, second, and third permanent magnets to form first, second, and third magnetic circuits, said first, second, and third magnetic circuits providing magnetic flux for the first, second, and third air gaps, respectively;

    means mounting the coil for rotational motion within said magnetic structure about an axis parallel to the second side of the coil; and

    indicator means responsive to coil movement.

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