JP4447140B2 - Motor stator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric motor stator used for an electric motor for driving a compressor for an air conditioner or a refrigerator.
[0002]
[Prior art]
5 and 6 are views showing a conventional electric motor stator disclosed in, for example, Japanese Patent Laid-Open No. 9-191588. As shown in FIG. 5, a predetermined number of magnetic materials in which a plurality of core pieces 101 are connected through thin connection portions 102 are laminated. Further, the connecting portion abutting surfaces 102 a and 102 b are located on both sides of the thin connecting portion 102. In addition, 101b and 101c are end abutting surfaces of the core pieces 101 located at both ends, and have the same shape as the connecting portion abutting surfaces 102a and 102b.
[0003]
In the stator configured as described above, a winding (not shown) is wound around each core piece 101, and each thin connecting portion 102 is bent as shown in FIG. The abutting surfaces 102a and 102b are abutted and finally the end abutting surfaces 101b and 101c are abutted to form an annular shape, thereby forming an electric motor stator.
[0004]
[Problems to be solved by the invention]
Since the conventional motor stator is configured as described above, the end butting surfaces 101b and 101c are easily displaced in the radial direction when formed in an annular shape, and it is difficult to maintain the mechanical accuracy of the stator. . Therefore, when it is configured as an electric motor, the magnetic performance of the magnetic material is impaired, and the efficiency of the electric motor is deteriorated, or there is a problem that magnetic imbalance occurs and vibration and noise are generated during operation.
[0005]
Moreover, although the example which comprised the connection part with the thin wall was given in the said description, the same problem generate | occur | produces what has comprised the structure which can be bent by some other method.
[0006]
Moreover, although the example of the shape of the connection part abutting surfaces 102a and 102b and the end part abutting surfaces 101b and 101c is a straight shape, the same problem also occurs when it is formed in an arc shape or the like.
[0007]
The present invention has been made to solve the above-described problems, and by making it possible to easily ensure mechanical accuracy during the manufacture of the motor stator, it is possible to reduce the efficiency of the motor, vibration, and noise. The purpose is to reduce.
[0008]
[Means for Solving the Problems]
In the motor stator according to the present invention, a predetermined number of magnetic materials in which a plurality of core pieces are connected via a connecting portion are laminated, and connecting portion abutting surfaces are located on both sides of the connecting portion, and further, The core piece has an end abutting surface, and after the winding is wound around the core piece, each connecting portion is bent, the connecting portion abutting surfaces are abutted, and finally the end abutting surfaces are abutted to form a ring In the electric motor stator formed in the above, the shape of the end butting surface is a dogleg shape.
[0009]
Further, the connecting portion is formed of a thin wall.
[0010]
Further, the U-shaped end butting surface is formed by a combination of two arcs of a first arc and a second arc, and the center of each arc is a connecting portion of any core piece in the stator. Is substantially coincident with the center of rotation when bending.
[0011]
In addition, when the end-butting surfaces are butted, a protrusion having the outer peripheral side of the motor stator as a tip is formed, and the tip of the protrusion is positioned inside the outer periphery of the motor stator.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
1 and 2 are diagrams showing the first embodiment, in which FIG. 1 is a plan view of a belt-shaped motor stator, and FIG. 2 is a plan view of a motor stator formed in an annular shape.
In FIG. 1, 1 is a plate-like core piece made of a magnetic material, and 2 is a thin-walled connecting portion provided on the core piece 1. 1a is a teeth portion provided on the core piece 1, and 2a and 2b are connecting portion abutting surfaces located on both sides of the thin connecting portion 2. Reference numerals 1b and 1c denote dog-shaped end butting surfaces located on opposite sides of the thin-wall connecting portions 2 of the core pieces 1 at both ends.
[0013]
A method of manufacturing the motor stator configured as described above will be described. After the winding (not shown) is wound around the tooth portion 1a, each core piece 1 is folded at each thin-walled connecting portion 2 as shown in FIG. 2, and the connecting portion butting surfaces 2a and 2b are butted together. Finally, the end butting surfaces 1b and 1c at both ends are butted together, formed into a ring shape, fixed by welding or the like, and the terminal wire of the winding is connected to form an electric motor stator.
[0014]
Since it is comprised as mentioned above, the positional relationship of each core piece 1 is determined by each connection part abutting surface 2a and 2b and end part abutting surface 1b and 1c. Since the end butting surfaces 1b and 1c are shaped like a dogleg, the movement in the radial direction is restricted when they are butted, so the mechanical accuracy of the motor stator is uniquely determined, and the core piece 1 is punched out. The accuracy can be easily ensured by increasing the accuracy.
[0015]
In the present embodiment, the connection portion is configured to be thin, but the connection portion is configured by some other method, and a plurality of deployed core pieces 1 can be formed in an annular shape. The same effect can be obtained.
[0016]
Embodiment 2. FIG.
Embodiment 2 of the present invention will be described below with reference to the drawings.
FIG. 3 is a diagram showing the second embodiment, and is a plan view of an electric motor stator showing a state immediately before being formed in an annular shape.
In FIG. 3, 1 is a plate-shaped core piece made of a magnetic material, and 2 is a thin-walled connecting portion provided on the core piece 1. Reference numerals 2 a and 2 b denote connecting part butting surfaces located on both sides of the thin connecting part 2. Reference numerals 1b and 1c denote dog-shaped end butting surfaces located on opposite sides of the thin-wall connecting portions 2 of the core pieces 1 at both ends.
[0017]
The end butting surfaces 1b and 1c are composed of two arc-shaped first arc 1d and second arc 1e, and the center of each arc is when the thin connecting portion 2 of any core piece 1 is bent. Is roughly coincident with the center of rotation.
[0018]
Since it is comprised as mentioned above, the rotation center of the thin connection part 2 of the core piece 1 at the time of finally abutting the core pieces 1 of both ends is the 1st circular arc 1d and the 2nd circular arc 1e. Since it is the center, even if the thin connecting portion 2 that is the center is bent last, the core pieces 1 can be formed in an annular shape without interfering with each other.
[0019]
Therefore, there are no restrictions on the order of the bending process, and the degree of freedom in equipment can be increased. Further, since interference in the bending process can be eliminated, a highly reliable motor stator can be manufactured.
[0020]
In the present embodiment, the connection portion is configured to be thin, but the connection portion is configured by some other method, and a plurality of deployed core pieces 1 can be formed in an annular shape. The same effect can be obtained.
[0021]
Embodiment 3 FIG.
Embodiment 3 of the present invention will be described below with reference to the drawings.
FIG. 4 is a diagram showing the third embodiment, and is a plan view showing a part of the motor stator.
In FIG. 4, 1 is a plate-shaped core piece made of a magnetic material, and 1b and 1c are dog-shaped end butting surfaces located on opposite sides of the thin-walled connecting portions 2 of the core pieces 1 at both ends. Reference numeral 3 denotes a protrusion formed when the end abutting surfaces are abutted, and has a mountain shape with the outer peripheral side of the motor stator as the tip, and the tip of the protrusion 3 is located inside the outer periphery of the motor stator. positioned.
[0022]
Since it is configured as described above, when the core pieces 1 at both ends are finally abutted, the tip of the protrusion 3 faces the outer peripheral side, and when the end abutting surfaces 1b and 1c are fixed by welding, they are flat. Compared to welding to the arc surface of the surface or outer periphery, the arc can easily fly to the necessary part, and stable welding can be performed.
[0023]
【The invention's effect】
In the electric motor stator according to the present invention, since the shape of the end abutting surface is a U-shape, the positional relationship of each core piece is determined by each connecting portion abutting surface and the end abutting surface. Since the shape of the is a U-shaped, the radial movement is restricted when it is abutted, so the mechanical accuracy of the motor stator is uniquely determined, and it can be easily improved by increasing the accuracy of punching of the core piece etc. Can be secured. Therefore, electromagnetic noise and vibration due to mechanical accuracy can be reduced, and a high-efficiency, low-noise, low-vibration motor stator with high-density windings can be easily obtained.
[0024]
Further, the U-shaped end butting surface is formed by a combination of two arcs of a first arc and a second arc, and the center of each arc is a connecting portion of any core piece in the stator. The center of rotation of the connecting portion of the core pieces when the core pieces at both ends are finally brought into contact with each other is the center of the first arc and the second arc. Therefore, even if the connecting portion which is the center is bent at the end, the core pieces can be formed in an annular shape without interfering with each other. Therefore, there are no restrictions on the order of the bending process, and the degree of freedom in equipment can be increased. Further, interference in the bending process can be eliminated. Therefore, it is possible to obtain a highly reliable electric motor stator with better assembly.
[0025]
In addition, when the end butting surfaces are butted, a protrusion having the outer peripheral side of the motor stator as a tip is formed, and the tip of the protrusion is positioned on the inner side of the outer periphery of the motor stator. When the core pieces at both ends are generally abutted, the tip of the protrusion faces the outer peripheral side, and when fixing the end abutting surface by welding, an arc is required compared to welding to a flat surface or an arcuate surface of the outer periphery It is easy to fly to the part and can be welded stably. Therefore, it is possible to obtain a highly reliable electric motor stator with better assembly.
[Brief description of the drawings]
FIG. 1 shows the first embodiment and is a plan view of a belt-like electric motor stator. FIG. 2 is a plan view of a motor stator formed in an annular shape.
It is a top view of the electric motor stator in FIG.
FIG. 2 shows the first embodiment, and is a plan view of a motor stator formed in an annular shape.
FIG. 3 shows the second embodiment and is a plan view of an electric motor stator showing a state immediately before being formed in an annular shape.
FIG. 4 shows the third embodiment, and is a plan view showing a part of an electric motor stator formed in an annular shape.
FIG. 5 is a plan view of a conventional motor stator.
FIG. 6 is a plan view of a conventional electric motor stator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Core piece, 1a Teeth part, 1b End part abutting surface, 1c End part abutting surface, 1d 1st circular arc, 1e 2nd circular arc, 2 Thin connection part, 2a Connecting part abutting surface, 2b Connecting part abutting surface, 3 protrusion.

Claims (3)

A predetermined number of magnetic materials in which a plurality of core pieces are connected via a connecting portion are stacked, and connecting portion abutting surfaces are located on both sides of the connecting portion, and further, end core abutting surfaces are provided on the core pieces at both ends. Then, after the winding is wound on the core piece, in the electric motor stator formed in an annular shape by bending each connecting portion, butting the connecting portion butting surfaces, and finally butting the end butting surfaces together, The shape of the end butting surface is a dogleg shape ,
The U-shaped end butting surface is formed by a combination of two arcs of a first arc and a second arc, and the center of each arc is a connecting portion of any core piece in the stator. An electric motor stator characterized by being substantially coincident with a center of rotation at the time of bending.   When the end butting surfaces are butted, a protrusion having the outer peripheral side of the motor stator as a tip is formed, and the tip of the protrusion is located inside the outer periphery of the motor stator. The electric motor stator according to claim 1. Claim 1 or claim 2 motor stator, wherein the configuring the said connecting portion at thin.

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