Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2005-04-12
2005-04-12
Lam, Thanh (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S254100, C310S036000, C368S157000, C368S160000
Reexamination Certificate
active
06879068
ABSTRACT:
Protrusions (260) for adjusting the cogging torque of a rotor (21) are formed on a stator (22) in a small-size power generator (20). Since the protrusions (260) are formed on an inner periphery of a rotor accommodation hole (230) within an angular range of ±45° around a magnetic flux direction of a first magnetic circuit (100) having a smaller magnetic reluctance at a rotation center of the rotor (21), the cogging torque can be effectively reduced. Accordingly, even when the size of components such as an oscillating weight and a power spring is reduced for making a thin timepiece, rotation startability of the rotor can be improved, thus improving power generation efficiency of the small-size power generator.
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Lam Thanh
Seiko Epson Corporation
Watson Mark P.
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