Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-07-06
2001-03-20
Nguyen, Tran (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S06700R, C360S099080
Reexamination Certificate
active
06204583
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Applications: Hei 10-191743, filed on Jul. 7, 1998 and Hei 10-214977, filed on Jul. 30, 1998, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a center piece structure of a brush-less motor and a method of manufacturing the brush-less motor.
2. Description of the Related Art
A common outer rotor type brush-less motor has a stator core fixed to an upper surface of a motor holder and a stator winding supported by a center piece which has a flange portion and a cylindrical portion. The cylindrical portion has an inner periphery which supports a pair of bearings, which rotatably supports a rotor shaft.
Usually, such a center piece has been made of aluminum alloy die-cast. However, such a center piece may need another machining step for finishing to provide necessary precision and bearing's retaining surfaces. This increases production cost and time.
SUMMARY OF THE INVENTION
A main object of the invention is to provide a brush-less motor having an improved center piece structure.
According to a preferred embodiment of the invention, a brush-less motor includes a press-formed center piece which does not require additional finishing step.
The cylindrical portion may have a cut-down projection extending radially inward to position bearing members in the axial direction thereof.
According to another preferred embodiment of the invention, a method of manufacturing a brush-less motor including a step of providing a stator winding on the stator core, and a step of fixing an outer periphery of the cylindrical portion to the stator core thereafter.
REFERENCES:
patent: 4423540 (1984-01-01), Hishida
patent: 4471250 (1984-09-01), Snider
patent: 4698542 (1987-10-01), Muller
patent: 5160866 (1992-11-01), Hishida et al.
patent: 5363003 (1994-11-01), Harada et al.
patent: 5434729 (1995-07-01), Katakura et al.
patent: 5772336 (1998-06-01), Katagiri
patent: 5925948 (1999-07-01), Matsumoto
patent: 8-9696 (1996-01-01), None
Ishikawa Toshio
Sasaki Keisuke
Yoshimura Kenji
Asmo Co. Ltd.
Fish & Richardson P.C.
Nguyen Tran
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