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Eddy Current Reduction Means for Magnetic Stator Structure of a Print Actuator

IP.com Disclosure Number: IPCOM000105640D
Original Publication Date: 1993-Aug-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Helinski, EF: AUTHOR

Abstract

The described stator is used in high speed dot matrix actuators and results in improved efficiency by reducing eddy current losses.

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This is the abbreviated version, containing approximately 82% of the total text.

Eddy Current Reduction Means for Magnetic Stator Structure of a Print Actuator

      The described stator is used in high speed dot matrix actuators
and results in improved efficiency by reducing eddy current losses.

      When electrical current is rapidly applied to the coil of the
described print actuator shown in Fig. 1, it results in the
production of eddy currents in the stator (2) which oppose the
applied magnetic field produced by the coil (3).

      These eddy currents circulate around stator (2) and have been
conventionally reduced by the use of increased resistivity stator
material or by laminating the stator.

      However, conventional solutions can be both inappropriate and
costly, especially when using a round stator which is pressed and
flaired for attachment on the mounted end and heat-treated for impact
wear resistance on the free end, which contacts armature (4).

      Fig. 3 describes a stator which makes use of narrow cross
slotted openings (11), (12), which are located along the central axis
(13) of stator (2) starting at the free end (16) of stator (2) and
terminating near the mounted end (15) of stator (2).

      Slots (11) and (12) are made .15mm wide by the wire cut EDM
process or by other suitable processes and may be left open or may be
filled in using a non-conductive epoxy or other suitable material.

      The stator material is 8620 steel and can be hardened by lazer
heat treatment for wear resistance on its f...