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United States of America Patent
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Mar 16, 2010
Grant Date -
Jun 14, 2007
app pub date -
Jul 8, 2004
filing date -
Oct 15, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A case (100), a rotor (200) that is freely rotatably supported in the case (100), and stators (110) for rotating the rotor by magnetic force are provided. The stator (110) contains a core (111) mounted at the outside of the case (100), and a magnetic coil (112) wound around the core (111). An end face of the core (111) constituting a magnetic pole is formed of at least non-laminate ferromagnetic substance, and exposed to the inner surface of the case (100) so as to form a part of the inner wall of the case (100).
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