Motor

Details Motor Motor

2001-06-12

2003-04-01

Lam, Thanh (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S089000, C310S049030

Reexamination Certificate

active

06541886

ABSTRACT:

BACKGROUND OF THE INVENTION
a) Field of the Invention
The present invention relates to improvement of a motor allowing rotation while urging an end of its center shaft of a rotor in the axial direction.
b) Description of the Related Art
FIG. 4
shows conventional structure of a motor allowing rotation while urging an end of its center shaft of a rotor in the axial direction.
In a motor of
FIG. 4
, a pair of inside stator cores
51
a
and outside stator cores
51
b
are arranged in a shaft direction.
A coil bobbin with a wound winding is provided between the inside stator cores
51
a
and the outside stator cores
51
b.
Rotor
52
is positioned rotatably within said inside stator cores
51
a
and outside stator cores
51
b.
Each outside stator cores
51
b
serves as an outer enclosure case covering the motor from outside in an axial direction and in a radial direction which becomes the outside of the winding.
And an end face in an outside part of each winding of both outside stator cores
51
b
is fixed by welding (as shown in a weld, T
1
).
Cap member
54
is fixed to one edge surface of one outside stator core
51
b
in a shaft direction (corresponding to the end surface of an outer packing retaining shield) by welding (as shown in weld, T
2
).
Bearing
60
is fitted in cap member
54
and bearing
60
supports one end of center shaft
53
of rotor
52
.
Furthermore, at the outside of the cap member
54
, urging member
65
is attached having spring
65
a
which urges bearing
60
toward the direction of a bearing
63
(a bearing held by frame
55
is shown).
In addition, frame
55
, which is substantially U-shaped, is fixed to one of the end faces of the side of the other outside stator core
51
a
(corresponding to an end face of the outer enclosure case) by welding (as shown in a weld, T
3
).
As described above, one end of center shaft
53
of rotor
52
is supported by bearing
60
which fits in inside of cap member
54
.
And another end goes through stator
51
and protrudes to a greater degree than another end side.
That is, center shaft
53
of rotor
52
is inserted in hole
61
a
which is formed on plane portion
61
of the side fixed to stator
51
of frame
55
and end part of center shaft
53
is supported by bearing
63
that is fitted in plane portion
62
.
In addition, the circumference of center shaft
53
is composed of reed screw portion
57
.
As described above, the motor is configured to rotate while loading (preloading) the end of center shaft
53
of rotor
52
to bearing
63
arranged in frame
55
by urging bearing
60
toward the direction of bearing
63
.
The reason is because rotor
52
, caused to rotate mainly on center shaft
53
, rotates in a stable state against stator
51
at a predetermined position.
Both control of the dimension (measurement) of the full length in an axial direction of center shaft
53
and control of the spring power of spring
65
a
of urging member
65
need to be strictly done because rotor
52
cannot rotate smoothly at the predetermined position. Thus these controls are important in such a motor.
In addition, control of the dimension (measurement) of the full length of center shaft
53
in an axial direction is done by controlling the dimension (measurement) between the deepest portions of each hole of both bearings
60
,
63
(as shown in
FIG. 4
, L
1
).
Control of the spring power of spring
65
a
of urging member
65
is done by controlling the dimension (measurement) from mounting surface to mount cap member
54
to hold bearing
60
in one outside stator core
51
b
to the right-side end in
FIG. 4
(as shown in L
6
) and a control of distance (L
7
) is done from a point of action of spring
61
a
to a position to abut with bearing
60
on center shaft
53
.
Control of dimensions (measurements) in an axial direction of both outside stator core
51
b
which are faced and arranged in rotor
52
(as shown in L
4
, L
5
) and control of dimensions (measurements) of the full length of the whole stator (L
4
+L
5
) in an axial direction are important in order to precisely make above described L
1
.
As described above, in order to control the distance from a point of action of spring
65
a
of urging member
65
to an abutting position with bearing
60
on center shaft
53
, control of a dimension (measurement) in an axial direction from welding surface with one outside stator core
51
b
of cap member
54
to urging member
61
(as shown in L
6
) is important, too.
However, the above described motor has the constitution that both outside stator cores
51
b
are laminated and welded, as well as both sides in the axial direction welded frame
55
and cap member
54
.
Therefore it is difficult to control the dimension (measurement) of the full length of stator
51
side corresponding to the full length of center shaft
53
of rotor
52
.
In other words, as described above, both outside stator core
51
b
(L
4
+L
5
) and the dimensions (measurements) from the welding surface that frame
55
and stator core
51
b
contact with the surface of the inside of plane portion
62
(stator
51
side) (L
3
), therefore, it is necessary to carefully control the dimensions (measurements) of each part in forming a member of several parts.
Thus, when assembling, there is the problem that great confusion results in producing the required overall dimension (measurement) and clearance of each part is difficult.
In addition, when welding these parts, it is necessary to indicate that thickness of a welded location varies by pressure force in a calculation of the overall dimension, so that the work is extremely difficult.
Cap member
54
for holding urging member
65
has the structure that is fixed to one outside stator core
51
b
by welding as described above so that the above described problem occurs between stator core
51
b
and cap member
54
.
Therefore, confusion may exist concerning the distance L
7
from a welding surface between outside stator core
51
b
and cap member
54
to an out side surface of urging member
65
.
As a result, the motor has the overall problem that confusion results in the dimension (measurement) of distance(L
6
) from a point of action of spring
65
a
to an abutting position with bearing
60
on center shaft
53
.
In other words, even if it is assumed that all dimension (measurement) control of above described L
1
. . . L
7
(L
2
=dimensions(measurements) from a deepest portion of a hole of bearing
63
to a mounting portion to mount bearing
63
in frame
55
) can be strictly controlled, the above described motor still includes the problem that confusion occurs in determining a dimension (measurement).
OBJECT AND SUMMARY OF THE INVENTION
It is a primary object of the invention to provide a motor which can easily and precisely control the dimensions (measurements) of a stator part which faces and is arranged with a rotor and also controls the urging power of a spring for urging the rotor in a direction of the frame.
In accordance with the invention, a rotor comprises a stator, a rotor being arranged in and facing said stator, an urging member which urges a center rotation shaft of the rotor in an axial direction, and a bearing which rotatably holds the rotor at a predetermined position while receiving an urging force by the urging member. The stator is provided with a resin coil bobbin made by insert molding and integratedly assembled with a metal stator core. The stator core is arranged in and faces the rotor and forms a magnetic circuit therewith. The coil bobbin is arranged at the end side of the rotor. A holding portion is integratedly formed, the holding portion holds the urging member so as to urge the rotor to the bearing side. A curling base is fitted in. The curling base is formed such that a flat plate-shaped metal plate is rounded from outside of a winding wound by the electric coil bobbin in the circumference direction of the stator.


REFERENCES:
patent: 4381465 (1983-04-01), Renkl
patent: 5811903 (1998-09-01), Ueno et al.
patent: 6046519 (2000-04-01), Hanazumi et al.
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