Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2002-07-09
2004-10-05
Le, Dang (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
Reexamination Certificate
active
06800973
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electric motor incorporated in a compressor or the like mounted on an air conditioner or the like, and more particularly, it relates to an attachment structure of a lead wire drawn out of a stator winding.
2. Background Art
As shown in
FIG. 11
, an electric motor
1
a
incorporated in a compressor
1
mounted on an air conditioner or the like is constituted of a rotor
3
fixed to a rotation shaft
2
, and a stator
4
disposed on an outer peripheral side of the rotor
3
via a small gap.
A top plan view of the stator
4
is shown in FIG.
12
. The stator
4
is constituted of a stator core
5
having a plurality of (six in the drawing) magnetic pole teeth disposed in a peripheral direction at a predetermined interval so as to project toward a central portion (the rotor), and stator windings
7
a
to
7
f
wound around the respective magnetic pole teeth of the stator core
5
via insulating members
6
. In an end surface portion of the stator core
5
, a plurality of winding terminal receiving portions
8
a
to
8
f
are disposed integrally with the insulating members
6
. These winding terminal receiving portions
8
a
to
8
f
are dispersedly disposed on the end surface portion of the stator core
5
in the peripheral direction to accept winding ends of the respective stator windings
7
a
to
7
f
closely disposed.
The stator windings
7
a
to
7
f
are connected to a power source via a lead wire unit
11
. The lead wire unit
11
is constituted of lead wires
13
a
to
13
f
, winding side connection fittings
12
(
FIG. 13
) electrically connected to respective one ends of the wires and attached to the winding terminal receiving portions
8
a
to
8
f
, and a power source connector
14
disposed on the other end of the lead wire.
In general, attaching of terminal portions of the respective stator windings to the winding terminal receiving portions
8
a
to
8
f
and inserting/fixing of the connection portion
12
can be automated. In the attaching of the lead wire unit
11
, however, for example, with a three-phase motor, two for each phase, that is, six winding terminals
9
a
to
9
f
in total are present, and six connection fittings
12
and six lead wires
13
a
to
13
f
are therefore necessary. Therefore, manufacturing cost of the lead wire unit
11
is raised, further a large number of processes are necessary for attaching the unit, and from this aspect, cost also increases.
Moreover, for the conventional connection fitting
12
, while the lead wires
13
a
to
13
f
are inserted into lower cutouts of the connection fittings
12
in a radial direction, the connection fitting
12
is pressed downward to break insulation of the lead wire and electrically connect the connection fitting
12
to the lead wire. In this case, the lead wires
13
a
to
13
f
turned in the radial directions to be inserted into the connection fittings
12
are led around in the peripheral direction and connected to the power source connector
14
, and therefore flexing forces act on the lead wires
13
a
to
13
f
in the connection fittings
12
. Therefore, when an external force is further applied to the lead wires
13
a
to
13
f
and the connection fittings
12
, there is a possibility that disconnection and connection defect occur with the lead wire.
In order to avoid the aforementioned disadvantage, as shown in
FIG. 14
, the flexing force is prevented from acting on the lead wire. Winding terminal receiving portions
16
for a three-phase motor are collectively disposed in one place on the end surface of the stator core
5
, the winding terminal is attached in a vertical direction to a connection terminal
15
disposed in the winding terminal receiving portion
16
, and further a bifurcated terminal conductor
18
a
disposed on a terminal plate
17
is pressed from above and inserted into the connection terminal
15
to put the winding terminal between leg portions, so that the winding terminal is electrically connected to the terminal conductor
18
a
. The other end of the terminal conductor
18
a
whose one end is vertically inserted into the connection terminal
15
is bent as a terminal conductor
18
b
at right angles in the terminal plate
17
and extended to the outside in the radial direction. A casing
19
is formed to surround the terminal conductor
18
b
. The terminal conductor
18
b
and casing
19
are joined to a winding end side connection portion
11
a
of the lead wire unit
11
to constitute a connection terminal for electric connection.
A connection structure of
FIG. 14
can solve a problem of flexing force exerted on the lead wire in
FIGS. 12 and 13
, but it is necessary to lead a far detached winding terminal along the insulating member
6
to the winding terminal receiving portion
16
. Therefore, a winder structure for performing this operation becomes complicated. Furthermore, in this case, the terminal plate
17
needs to be integrally molded with a terminal
18
by a resin mold, and this is one factor to cause cost increase.
SUMMARY OF THE INVENTION
The present invention has been developed in consideration of the aforementioned circumstances, and an object thereof is to provide a highly reliable motor in which to attach a lead wire unit to the motor, the number of operation processes can be reduced to achieve cost decrease, and further a damage associated with leading of a lead wire does not easily occur.
To achieve the aforementioned object, according to one embodiment of the present invention, there is provided a motor comprising a plurality of windings wound around a stator core; a plurality of winding terminal receiving portions, disposed on an end surface portion of the stator core at an interval in a peripheral direction, for individually receiving a plurality of winding terminal portions; a plurality of first conductive connection fittings, attached to said respective winding terminal receiving portions, for fixing said winding terminal portions to said winding terminal receiving portions and for electrically connecting with said winding terminal portions; a plurality of second conductive connection fittings whose one surface side is provided with a projection for contacting said first connection fitting and whose other surface side is provided with a lead wire which is electrically connected to said winding terminal portion and which extends through the second conductive connection fittings in the peripheral direction of said stator core; and a terminal plate having connection fitting receiving portions to which said plurality of second connection fittings are attached and which are dispersed in the peripheral direction so as to correspond to said plurality of winding terminal receiving portions.
According to another embodiment, there is provided a motor comprising a plurality of windings wound around a stator core; a plurality of winding terminal receiving portions, disposed on an end surface portion of said stator core at an interval in a peripheral direction, for individually receiving a plurality of winding terminal portions; a plurality of connection fittings which fixes said winding terminal portion to said winding terminal receiving portion and which electrically connects with said winding terminal portion on one side, said plurality of connection fittings having a groove through which a lead wire connected to said winding terminal portion passes in the peripheral direction of said stator core on the other side; and a terminal plate having connection fitting receiving portions to which said plurality of connection fittings are attached and which are dispersed in the peripheral direction so as to correspond to said plurality of winding terminal receiving portions; said connection fitting being beforehand attached to either of said winding terminal receiving portion and said terminal plate. According to this embodiment, since the number of materials or the number of components can be reduced, the number of processes and cost can further be reduced.
The wi
Futami Toshihiko
Inaba Yoshiaki
Kawamura Kiyotaka
Le Dang
Pillsbury & Winthrop LLP
Toshiba Carrier Corporation
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