Electricity: measuring and testing – Magnetic – Displacement
Reexamination Certificate
2006-09-26
2006-09-26
Patidar, Jay M. (Department: 2862)
Electricity: measuring and testing
Magnetic
Displacement
C324S207220, C324S207200, C324S207170, C310S06800R, C360S073030
Reexamination Certificate
active
07112956
ABSTRACT:
In an index signal generator for generating an index signal for use in a direct-drive motor having a rotation axis and comprising a stator and a rotor, a particular at least one of M magnetized elements is used as an index detection magnet having magnetic force which is different from those in remaining ones of the M magnetized elements. Wound around one of a specific one of particular three cores in the stator, an index detection coil detects variations of the magnetic force generated by the ring-shaped permanent magnet to produce a detected signal. On the basis of the detected signal, the index signal is generated.
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Otomo Yoshihito
Shibata Akira
Frishauf Holtz Goodman & Chick P.C.
Mitsumi Electric Co. Ltd.
Patidar Jay M.
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