Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2001-03-09
2003-06-17
Lam, Thanh (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S216006, C310S216055
Reexamination Certificate
active
06580193
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application is based on and incorporates herein by reference Japanese patent application No. 2000-97652 filed Mar. 31, 2000.
BACKGROUND OF THE INVENTION
The present invention relates a rotary electric machine and a manufacturing method for the same, and specifically to an insulation structure between an armature core and a winding of a rotor and an assembling method for the rotor.
In a conventional rotary electric machine, for example a direct current motor, various structures and methods are used to provide insulation between an armature core and a winding which form a rotor. Such methods include painting insulating powders on the core, or disposing an insulator made of paper or insulating resin material between the core and the winding. However, those structures and methods require a number of separate insulating parts and a number of assembling processes.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a rotary electric machine and a manufacturing method therefor which are effective to reduce the number of insulating parts and the number of assembling processes thereby to improve production costs while ensuring insulation.
According to the present invention, a core insulator is disposed between a stacked core and a winding. The core insulator is formed with a plurality of tooth cover pieces covering one axial side surface of the stacked core, and coil bobbin pieces formed to extend from tooth cover pieces for covering corresponding slot inner side surfaces of the stacked core. The coil bobbin pieces have respective top ends which protrude from the other axial side surface of the stacked core. Preferably, the top ends of the coil bobbin pieces are chamfered to have a curved or tapered surface. Each top end of the coil bobbin pieces is formed with a plurality of cut-outs.
In manufacturing the rotary electric machine, a plurality of core sheets punched out from a metal plate are inserted into the core insulator to form the stacked core. The core sheets are inserted in sequence to form the stacked core. Alternatively, the stacked core is formed by stacking a predetermined number of the core sheets and then inserting the stack of the core sheets.
REFERENCES:
patent: 4818911 (1989-04-01), Taguchi et al.
patent: 5698923 (1997-12-01), Scherzinger et al.
patent: 5780951 (1998-07-01), Stephens
patent: 6177751 (2001-01-01), Suzuki et al.
patent: 6333576 (2001-12-01), Ishikawa et al.
Kamogawa Sumiyoshi
Matsushita Yoshiyuki
Matsuura Yoshiaki
Niimi Kouji
Sasaki Takayoshi
Asmo Co. Ltd.
Lam Thanh
Posz & Bethards, PLC
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