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Stepping motor

  • US 5,945,750 A
  • Filed: 02/12/1996
  • Issued: 08/31/1999
  • Est. Priority Date: 02/11/1995
  • Status: Expired due to Term
First Claim
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1. A stepping motor comprising:

  • a first coil;

    a second coil;

    a first substantially planar U-shaped stator disposed in a first plane of the stepping motor including;

    a first connecting member; and

    ,a first pair of elongate stator arms extending longitudinally in parallel from said first connecting member and terminating at a first pair of spaced apart free ends, the first pair of elongate stator arms being spaced apart transversely and including a first pair of opposed arcuate recesses therebetween defining a first pair of stepping motor poles at a position on said first pair of stator arms between said first connecting member and said first pair of spaced apart free ends, the first pair of elongate stator arms being adapted to slidably receive the first coil onto at least one free end of said first pair of free ends and carry the first coil between the first connecting member and said at least one free end of said first pair of free ends;

    a second substantially planar U-shaped stator disposed in a second plane parallel to and spaced apart from the first plane of the stepping motor including;

    a second connecting member; and

    ,a second pair of elongate stator arms extending longitudinally in parallel from said second connecting member in a second direction offset from said first direction by 90° and

    terminating at a second pair of spaced apart free ends, the second pair of elongate stator arms being spaced apart transversely and including a second pair of opposed arcuate recesses defining a second pair of stepping motor poles at a position on said second pair of stator arms between said second connecting member and said second pair of spaced apart free ends, the first pair of opposed arcuate recesses being located on the first pair of stator arms spaced apart from the first pair of free ends and the second pair of opposed arcuate recesses being located on the second pair of stator arms spaced apart from the second pair of free ends to establish a relative overlap between the first pair of elongate stator arms and the second pair of elongate stator arms, the relative overlap being established with the first pair of spaced apart free ends extending beyond the second pair of elongate stator arms and the second pair of spaced apart free ends extending beyond the first pair of elongate stator arms, the second pair of elongate stator arms being adapted to slidably receive the second coil onto at least one free end of said second pair of free ends and slidably carry the second coil between the second connecting member and said at least one free end of said second pair of free ends; and

    ,a cylindrical rotor member including a pair of coaxially spaced apart polar pairs relatively offset from each other by 180°

    , a first polar pair of said pair of coaxially spaced apart polar pairs being disposed in said first plane of said stepping motor between said first pair of opposed arcuate recesses and the second polar pair of said pair of coaxially spaced apart polar pairs being disposed in said second plane of said stepping motor between said second pair of opposed arcuate recesses.

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