Dynamo-electric machine and method of manufacture therefor

Details Dynamo-electric machine and method of manufacture therefor Dynamo-electric machine and method of manufacture therefor

1999-05-24

2001-04-17

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S234000, C310S198000, C310S071000

Reexamination Certificate

active

06218755

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a dynamo-electric machine which comprises equalizing connectors electrically connecting commutator segments which should have the same electric potential to each other, and to a method of manufacture therefor.
2. Description of the Related Art
FIG. 14
is a partial cross-section of an electric motor which is a conventional dynamo-electric machine. In this electric motor, a commutator assembly
101
is disposed in the vicinity of an armature
100
.
The armature
100
comprises: a core
102
having slots extending in the axial direction; and a winding
103
composed of wiring wound by a lap winding method through the slots.
The commutator assembly comprises: a commutator
105
having commutator segments
104
arranged around its circumference and risers
106
electrically connected to the winding
103
; brushes (not shown) which contact the commutator segments
104
; and equalizing connectors
107
electrically connecting commutator segments
104
which should have the same electric potential to each other. End portions
108
of the equalizing connectors
107
shown in
FIG. 15
are secured to the risers
106
by brazing, etc. The equalizing connectors
107
are secured and supported by a securing member
109
, enabling the equalizing connectors
107
to withstand centrifugal force.
In the above 4-pole lap-wound electric motor, an electric current is supplied to the winding
103
from outside by means of the brushes contacting the commutator segments
104
, whereby the armature
100
, equalizing connectors
107
, and the commutator
105
, which are all secured to a rotating shaft (not shown), rotate together with the shaft due to electromagnetic effects.
In an electric motor of the above construction, the equalizing connectors
107
are provided to prevent circulating currents which run through the brushes generated by differences in induced voltage between circuits in the winding
103
, but one problem is that these equalizing connectors
107
require the securing members
109
for support, increasing the number of parts.
Another problem is that space is required to hold the equalizing connectors
107
and the securing members
109
, and such space is difficult to procure, particularly in a small electric motor for use in an automobile.
SUMMARY OF THE INVENTION
The present invention aims to solve the above problems and an object of the present invention is to provide a dynamo-electric machine enabling reductions in the number of parts as well as in size, etc., and to provide a method of manufacture therefore.
To this end, according to the present invention, there is provided a dynamo-electric machine comprising: a shaft; a core secured to the shaft having slots formed therein extending in the axial direction; a winding composed of a wiring wound by a lap winding method through the slots; a commutator having commutator segments disposed at one end of the core and secured to the shaft; and equalizing connectors electrically connecting commutator segments which should have the same electric potential to each other; the equalizing connectors being disposed in close contact with an end surface of the commutator.
According to another aspect of the present invention, there is provided a method of manufacture for a dynamo-electric machine including: a step of connecting commutator segments which should have the same electric potential to each other by cutting the wire after using the wire to fasten commutator segments which should have the same electric potential to each other, and a step of immediately thereafter forming a winding by winding the wire onto the core.
According to still another aspect of the present invention, there is provided a method of manufacture for a dynamo-electric machine including: a step of connecting the commutator segments to each other continuously by a continuous wire, a step of forming equalizing connectors by removing unwanted wire connecting the commutator segments to each other, and a step of electrically connecting both ends of the equalizing connectors to the commutator segments.


REFERENCES:
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patent: 3590296 (1971-06-01), Dumez
patent: 3781981 (1974-01-01), Miura et al.
patent: 3942246 (1976-03-01), Wilding
patent: 4633577 (1987-01-01), Banner
patent: 4876472 (1989-10-01), Shiraki et al.
patent: 5113574 (1992-05-01), Nuss
patent: 56-149565 (1955-04-01), None
patent: 358039248A (1983-03-01), None
patent: 59-86847 (1984-06-01), None

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