×

Method and apparatus for precisely moving a motor armature

  • US 4,870,306 A
  • Filed: 10/08/1981
  • Issued: 09/26/1989
  • Est. Priority Date: 10/08/1981
  • Status: Expired due to Term
First Claim
Patent Images

1. In an electromagnetic actuator having a pair of actuator assemblies relatively movable with respect to each other for generating incremental movement to an output member to a plurality of positions along a given path in at least one of two opposite given directions, the improvement wherein:

  • one of said pair of assemblies includes means for establishing a magnetic field of one polarization for allowing said magnetic field to be directed generally transversely along a given distance to the other of said pair of assemblies;

    said other assembly including a plurality of spaced first means selectively operable for establishing a plurality of electromagnetic fields each of which is selectively cooperable with said transverse field for creating a first electromagnetic force tending to drive one of the pair of relatively movable assemblies in said one given direction, and a plurality of second means arranged in alternating relationship with said first means and being operable for establishing a plurality of electromagnetic fields each of which is selectively cooperable with said transverse field for creating a second electromagnetic force tending to drive the one relatively movable assembly in the other of the two directions with a force generally equal to that created by the first means;

    adjacent pairs of said first and second means being grouped in a space so that said given distance of said transverse field at least encompasses substantially equal sections of the adjacent pairs of said first and second means such that when the fields of energized adjacent pairs of said first and second means are intercepted by said transverse field they arrest movement of said one movable assembly and maintain it at one of the plurality positions, which position is generally between said intercepted adjacent energized pair of said first and second means, and further whereby movement in either of said two directions is achieved by selectively energizing only one of said adjacent pair of said first and second means intercepted by the transverse field.

View all claims
  • 12 Assignments
Timeline View
Assignment View
    ×
    ×