Motor having shifted teeth of pressed powder construction
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United States of America Patent
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-
Jun 10, 2008
Grant Date -
Apr 26, 2007
app pub date -
Nov 20, 2006
filing date -
Sep 22, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multi-polar rotary machine comprises a cylindrical outer rotor arranged concentrically with the stator and with an air gap therebetween. The stator has two spaced stator elements and a ring shaped permanent magnet held between the stator elements and magnetized so as to form N and S poles in the axial direction of the stator. Small axially separated stator teeth A and and B and B are formed on the outer peripheral surface of the spaced stator elements. Stator windings for A phase and B phase are wound around the respective stator elements. The small stator teeth A, , B and B are circumferentially shifted from corresponding small rotor teeth by a 1/4 pitch of the small stator teeth, respectively. Each of the stator and rotor is formed of pressed powder comprising a soft magnetic material at least one of a resin and an inorganic material.
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