Linear motor
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United States of America Patent
Stats
-
Nov 9, 2004
Grant Date -
Sep 30, 2004
app pub date -
Apr 7, 2004
filing date -
Jun 21, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An electric linear motor for driving a reciprocating load includes a stator, a coil, an armature and a commutation circuit. The stator has a magnetically permeable core with an air gap. The coil is wound around a portion of the stator and energized with a non-constant voltage for producing a non-constant magnetic flux in the stator and the air gap. The armature supports a permanent magnet having a substantial portion located in the air gap. The interaction of the magnetic field of the magnet and the non-constant flux in the air gap produces a force on the armature. The armature is connected to the load and reciprocates with respect to the stator. The circuit controls the coil such that at least one end of the magnet passes outside the region of substantially uniform flux density within the air gap during a portion of the motion of the armature.
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