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Electromagnetic device with stator displacement regulation

  • US 5,939,811 A
  • Filed: 03/11/1997
  • Issued: 08/17/1999
  • Est. Priority Date: 03/11/1996
  • Status: Expired due to Fees
First Claim
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1. An electromagnetic device comprising:

  • a plurality of magnetic plates stacked spirally to form a cylindrical stator, the magnetic plates having radially inner ends and radially outer ends, the cylindrical stator having a central hole extending in an axial direction at a radial center of the stator;

    a coil mounted on the stator;

    an armature disposed adjacently to one axial end of the stator with an axial spacing relative to the one axial end of the stator and held movably toward the one axial end of the stator when the coil is energized, the armature being positioned coaxially with the stator and being smaller in diameter than the stator;

    a support body having a disk part and a central part extending axially from a radial center of the disk part, the disk part being in abutment with another axial end of the stator, and the central part being fitted in the central hole of the stator and welded to the radially inner ends of the magnetic plates thereby to fix the radially inner ends of the magnetic plates to the support body; and

    a ring disposed near the armature and in abutment with the radially outer ends of the magnetic plates on the one axial end of the stator, thereby pressing the radially outer ends of the magnetic plates toward the disk part of the support body and regulating the axial spacing of the armature relative to the one axial end of the stator,wherein;

    the radially inner ends of the magnetic plates are welded to only an axial end of the central part of the support body.

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