Stator structure

Details Stator structure Stator structure

2000-03-31

2002-01-08

Ramirez, Nestor (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S254100

Reexamination Certificate

active

06337526

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a stator structure, and in particular, to an improved stator structure employing magnetism to achieve balancing of a motor stator so as to reduce vibration thereof.
2. Description of the Related Art
Common motors mainly comprise two parts, a stator and a rotor. The rotation of the motor is caused by the alternating variations of magnetic fields acting the stator to drive the rotor to rotate. A rotating shaft coupled to the stator via a bearing is used to support the rotor to rotate about the center line of the rotating shaft.
However, there are clearances in the bearing no matter what the type of the bearings is. These clearances can cause vibrations when the rotor rotates at a high speed. Due to the vibrations, the working efficiency of the motor is lowered, and the longevity of the motor is shortened.
FIG. 1
is a schematic view showing a conventional motor stator structure
100
comprising a magnetically conductive cylinder
101
, an upper pole layer
102
, a lower pole layer
103
, an insulating layer
810
and a coil
820
. The upper pole layer
102
is located on a first plane and is substantially in the shape of a ring, the internal side of the ring is mounted on the external side of the top end of the cylinder
101
, and the external side of the ring is formed with a plurality of upper spaced apart tabs. The lower pole layer
103
is located on a second plane which is parallel to the first plane and is substantially in the shape of a ring, the internal side of the ring is mounted on the external side of the bottom end of the cylinder
101
, and the external side of the ring is formed with a plurality of lower spaced apart tabs. Viewed from over the motor stator structure
100
, the upper spaced apart tabs
102
and the lower spaced apart tabs
103
are complementary. The insulating layer
810
is mounted between the upper pole layer
102
and the lower pole layer
103
and is mounted on the magnetically conductive cylinder
101
. The coil
820
is winding on the insulating layer
810
.
FIG. 2
is a schematic view showing engagement of the rotor with the above mentioned conventional motor stator structure. In
FIGS. 1 and 2
, like numerals refer to like components. The rotor
700
comprises a body
701
, a rotating shaft
702
connected to the center of the body
701
; and a magnetic belt
703
circularly arranged at the internal circumference of the body
701
. A bearing
830
is provided between the internal surface of the magnetically conductive cylinder
101
and the rotating shaft
702
such that the rotor
700
rotates about the center line of the stator
100
. The position of the magnetic belt
703
is corresponding to that of the coil
820
. Thus, the change of direction of the magnetic fields produced by the coil
820
interacts with the magnetic belt
703
and causes the entire rotor
700
to rotate.
The drawback of the above conventional stator structure lies in that the magnetic conduction portion of the stator is constituted by three components, that is, the magnetically conductive cylinder, the upper pole layer and the lower pole layer, and the connection area of the magnetically conductive cylinder and the upper, lower pole layer affects the magnetically conductive effect. Further, in the process of connecting, the magnetically conductive cylinder or the upper, lower pole layer may be easily broken due to inappropriate mounting force.
FIG. 3
is a schematic view showing another conventional stator structure
200
, wherein the insulating layer and the coil are similar to those as shown in FIG.
1
and are denoted with like numerals. The stator structure
200
comprises a ring
201
, a plurality of upper spaced apart tabs
202
, a plurality of lower spaced apart tabs
203
, a plurality of waist posts
204
, an insulating layer
810
, and a coil
820
. The plurality of upper spaced apart tabs
202
are connected at the external side of the ring
201
, which defines an upper plane. The lower spaced apart tabs
203
are spaced apart from the ring
201
, are complementary to the plurality of upper spaced apart tabs
202
when viewed from over the stator structure
200
, and are provided on a second plane which is parallel to the first plane. The waist posts
204
are located between the first plane and the second plane. Each of the waist posts
204
has one end connected with the connection area of the corresponding one of the plurality of the upper spaced apart tabs
202
and the ring
201
and has the other end connected at the inner end of the lower spaced apart tabs
203
so as to form a magnetically conductive path. The insulating layer
810
is positioned between the upper spaced apart tabs
202
and the lower spaced apart tabs
203
, and on the waist posts
204
. The coil
820
winds on the insulating layer
810
.
FIG. 4
is a schematic view showing the engagement of the rotor with the conventional stator structure, wherein the rotor is similar to that as shown FIG.
2
. In
FIGS. 2
to
4
, like numerals refer to like components.
The rotor
700
comprises a body
701
; a rotating shaft
702
connected to the center of the body
701
, and a magnetic belt
703
mounted on the internal circumference of the body
701
. A bearing
830
is provided in between the rotating shaft
702
and the inner surfaces of the waist posts
204
such that the rotor
700
rotates about the center line of the stator
200
. The position of the magnetic belt
703
is corresponding to that of the coil
820
. Thus, the change of direction of the magnetic fields produced by the coil
820
and the induction of the magnetic belt
703
cause the entire rotor
700
to rotate.
The advantage of the conventional art is that the magnetically conductive path is integrally formed as a unit which can enhance the effect of the magnetic conduction. However, the conventional art have not solved the defect of vibration caused by the clearances as a result of the connection between the rotor and the stator by means of a bearing.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the invention to provide a stator structure which can reduce vibration caused by the rotor which rotates at high speed so that the working efficiency of the motor is improved and the longevity of the motor is extended.
One aspect of the present invention is to provide a stator structure comprising a plurality of upper spaced apart tabs substantially circularly arranged and formed on a first plane; and a plurality of lower spaced apart tabs substantially circularly arranged, complementary to the upper spaced apart tab when viewed from over the stator structure, and formed on a second plane parallel to the first plane, characterized in that the outer portion of each of the plurality of lower spaced apart tabs or upper spaced apart tabs extends to a position below or above the magnetic belt of the rotor so as to employ the magnetic force generated by the magnetic belt and lower spaced apart tabs or upper spaced apart tabs to maintain balancing of the rotor while rotating.
Another object of the present invention is to provide a stator structure, wherein apart from using a bearing to connect the stator and the rotor, the magnetic force around the rotor and the stator is additionally employed to maintain the rotating balancing of the rotor. Thus, the vibration due to the clearances of the bearings, when the motor rotates, can be greatly reduced. At the same time, the stator structure has not been changed, and therefore there is no need any more to provide any additional addition component or manufacturing process for maintaining the balancing of the rotor.


REFERENCES:
patent: 5859487 (1999-01-01), Chen
patent: 6097120 (2000-08-01), Horng

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