JP2003274579A - Stator for hermetically sealed compressor motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress vibration of a brushless motor stator, of a hermetically sealed compressor motor to realize noise reduction. <P>SOLUTION: End plate are placed on both end faces of the stator and tightened and fastened in the direction of lamination thickness. Thus, the rigidity of a laminate is enhanced with respect to deformation and torsion in the direction of lamination. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor for a hermetic compressor used in an air conditioner / cooler.

[0002]

2. Description of the Related Art As an electric motor used in a conventional hermetic compressor, a brushless motor in which windings are concentratedly wound around the teeth of a stator (hereinafter referred to as concentrated winding) is used because of its high productivity. It has become to. The stator of this concentrated winding brushless motor is usually made of an integral type laminated iron plate as shown in FIG. 12, but the teeth are joined as shown in FIG. 13 for the purpose of improving the winding efficiency. In some cases, the yoke is formed by joining stator pieces made of laminated iron plates divided at the center of the yoke. 12
In the figure, 30 is a yoke of the stator, 13 is an insulating paper, and 15 is a winding wound around the tooth portion 31 of the stator. Also, FIG.
3 is a stator piece, which is a joint surface 33 between the teeth.
a and 33b are joined together, and the outer peripheral side thereof is fixed by welding or the like to form the yoke 32 of the stator.

[0003]

However, as shown in FIG.
In the conventional configuration shown in or 13, since the space between the adjacent tooth portions of the stator is wide, the stator is more likely to be distorted due to torque fluctuation during rotation, and the stator vibrates and the noise becomes louder than the stator of the distributed winding specification. Have Further, in the conventional configuration shown in FIG. 13, since the yoke portion connecting the tooth portions of the stator has the joint surface, the rigidity is lowered, and the vibration becomes easier than the constitution shown in FIG. There was also a problem that the leakage loss of the magnetic flux in was increased.

Further, in the structure shown in FIG. 12, when the force received by the tightening and fixing of the pressure vessel to the shell of the pressure vessel, which is a general method of assembling the stator into the compressor, is unbalanced, There is also a problem that the inner peripheral side is deformed and the performance is adversely affected.

The present invention is to solve such a conventional problem, and by virtue of the arrangement of end plates on both end faces of the stator and tightening and fixing in the stacking direction, the vibration in the stacking direction and the space between the teeth are fixed. It is an object of the present invention to provide a low-noise electric motor for a hermetic compressor that suppresses torsional vibration.

[0006]

DISCLOSURE OF THE INVENTION The present invention is a stator composed of laminated iron plates constituting a brushless motor used in an electric motor for a hermetic compressor, wherein both ends of the stator are concentrated windings. An end plate is arranged, penetrates through a through hole provided in an iron plate laminated with the end plate, and is fixed by tightening with a pin or the like to enhance rigidity in the stacking thickness direction and suppress vibration and torsional vibration in that direction.

If a wedge is inserted between the adjacent tooth portions of the stator, the deformation due to the force acting between the tooth portions can be restricted and the vibration in the rotational direction can be suppressed.

Further, both ends of the inner peripheral side tooth portion of the stator are pierced through through holes provided in the stacking direction of the iron plates in advance and fixed by pins or the like to enhance the rigidity of the tooth portions, and between the tooth portions. Deformation due to working force is reduced and vibration in the rotation direction is also suppressed.

Further, according to the present invention, there is provided a stator made of laminated iron plates which constitutes a brushless motor used in an electric motor for a hermetic compressor, wherein the teeth of the stator which are concentrated windings are centered in the circumferential direction. Divided in the radial direction and without a stator piece,
The stator piece has a configuration in which the stator piece is united according to the irregularities for meshing provided on the joint surface of the stator piece. By increasing the apparent rigidity, deformation due to the force acting between the teeth is reduced and vibration in the rotation direction is suppressed,
End plates are arranged on both end surfaces of the stator, and the end plates and the laminated plate are penetrated through through holes provided in the projections and fastened with pins or the like to be fixed to enhance rigidity in the stacking direction and It is designed to suppress vibration and torsional vibration.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is an assembly diagram for explaining the structure of a brushless motor stator according to a first embodiment of the present invention. In the figure, reference numeral 12 denotes a stator yoke, which is formed by clamping an iron plate in advance as shown in FIG. 4, and end plates 16 shown in FIG. 3 are attached to both end surfaces of the stator yoke as shown in FIG. Through the through hole 12a of the yoke,
And the clamp pin 1 through the through hole 18 of the end plate 16.
It is further tightened and fixed by 7. Here, each of the overhanging portions 16a to 16f of the end plate 16 corresponds to the tooth portion of the stator 12, and is provided so that the tightening force is exerted over substantially the entire radial length of the tooth portion. Is. 1
Reference numeral 3 is an insulating paper, and reference numeral 15 is a winding wound around the tooth portion 14 of the stator.

FIG. 5 is a sectional view of a hermetic motor compressor using the brushless motor stator of the present invention. Reference numeral 1 is a stator, which is squeezed into a body shell 6 and fixed by a fit. A rotor 2 is fixed to a rotary shaft 4 of a mechanical portion 3 of the compressor. 5
Is a bearing, 7 and 8 are upper and lower shells, 9 is a suction pipe, 10 is a discharge pipe, and 11 is a power supply terminal.

With this structure, the movement of the iron plates forming the yoke of the stator is restricted in the stacking direction, and the radial force generated by the suction repulsion with the teeth of the stator when the rotor rotates. It is possible to suppress strain vibration in the stacking thickness direction of the iron plate due to the fluctuation.

(Second Embodiment) FIG. 6 is an assembly diagram for explaining the structure of a brushless motor stator according to a second embodiment of the present invention. The difference from FIG. 1 is that grooves 20a and 20b are provided in advance at both ends of the tooth portion 21 of the stator, and a non-magnetic wedge 22 is inserted between the adjacent tooth portions. With this configuration, the wedge 22 prevents the tooth portion from being deformed due to the fluctuation of the force in the rotational direction caused by the suction repulsion with the tooth portion of the stator during the rotation of the rotor, and the strain vibration of the iron plate in the rotational direction is generated. Can be suppressed.

(Third Embodiment) FIG. 7 is an assembly diagram for explaining the structure of a brushless motor stator according to a third embodiment of the present invention. The difference from FIG. 1 is that through holes 24 a and 24 b are provided in advance at both ends of the tooth portion 24 of the stator and fixed by press-fitting pins 25. With such a configuration, the rigidity of the stator tooth portion 24 in the rotation direction is increased, and displacement due to fluctuations in the force in the rotation direction caused by suction repulsion with the tooth portion of the stator during rotation of the rotor can be suppressed, It is also possible to suppress strain vibration in the rotation direction of the iron plate.

(Fourth Embodiment) FIG. 8 is an assembly diagram for explaining the structure of a brushless motor stator according to a fourth embodiment of the present invention. In the drawing, 27 is a stator yoke,
As shown in FIG. 10, the stator piece 28 divided at the circumferential center of the stator tooth portion is meshed with the concavo-convex portions 28a and 28b provided on the joint surface along the joint surfaces 28c and 28d. As shown in FIG. 9, the end plate 16 arranged on the end face of the stator is joined together, and the through hole 29 provided in the convex portion 28a of the stator and the through hole 18 provided in the end plate are passed through. It is configured by being clamped and fixed by the clamp pin 17. Here, the outer peripheral surface of the stator piece 28 is fixedly attached by welding or the like in at least two places in the stacking thickness direction. In addition, the assembly may be fixed between the stator pieces by welding or the like.

With this configuration, the deformation due to the imbalance of the force received from the outer circumference due to the constriction fit, which has been a problem in the conventional split type, causes the joining surfaces 28c and 28d of each stator piece 28 to move in the radial direction as compared with the prior art. Long enough to receive the force, and the meshing parts 28a, 28b have a hook-shaped structure that strongly prevents radial deviation, so even if there is an imbalance in force, the difference in strain will also occur. The number becomes small, and it is possible to sufficiently configure the structure without affecting the performance.
In this example, the strain was 1/10 or less compared with the conventional one.

Further, with respect to the fluctuation of the rotational force generated by the suction repulsion with the teeth of the stator when the rotor is rotated, the joint surfaces 28c and 28d of the stator piece 28 are squeezed from the outer periphery by a fit. The internal stress generated by the force received increases the apparent rigidity and suppresses deformation, and strain vibration in the rotating direction of the iron plate is also suppressed.

FIG. 11 (a) schematically shows the flow of magnetic flux in the stator yoke in the fourth embodiment, and FIG. 11 (b) schematically shows the flow of magnetic flux in the conventional stator yoke. As is clear from these figures, regarding the leakage loss of magnetic flux at the joint surface of the stator piece, which was a problem when dividing the conventional stator, the joint surface that cuts the cross section of the magnetic flux that causes leakage is The number is 1/3 of that of the conventional example (six locations from two locations), and the main magnetic flux shown by the solid arrow is not cut off, so it is reduced to a negligible level.

[0020]

As is apparent from the above description, a stator made of laminated iron plates constituting a brushless motor used in an electric motor for a hermetic compressor, which is provided on both end faces of the stator which is concentrated winding. Strain vibration in the stacking direction of the iron plates due to radial force fluctuations is suppressed by arranging the end plates, passing through the through holes provided in the iron plates laminated with the end plates, and tightening and fixing them with pins, etc. Therefore, there is an effect of suppressing noise generated by the vibration.

Further, by inserting a wedge between the adjacent teeth of the stator, distortion vibration of the iron plate due to fluctuation of the force in the rotating direction can be suppressed, and noise generated by the vibration can be suppressed. There is.

The same effect can be obtained by preliminarily fixing the both ends of the inner peripheral tooth portion in the stator by press-fitting pins in the stacking direction.

Further, in the stator composed of laminated iron plates constituting the brushless motor used in the electric motor for the hermetic type compressor, the stator tooth portion of concentrated winding is divided in the radial direction at the center in the circumferential direction. And a stator piece, and a stator formed by uniting in accordance with the engagement irregularities provided on the joint surface of the stator piece, and disposing end plates on both end surfaces of the stator,
By vibrating through the through holes provided in the convex of the end plate and the laminated plate and tightening and fixing them with pins etc., it is possible to suppress the strain vibration in the laminating direction of the iron plate due to the fluctuation of the radial force. This has the effect of suppressing the noise generated by.
In addition, the internal stress generated on the tooth joint surface of the stator piece enhances the apparent rigidity, the deformation due to the force acting between the teeth is suppressed, and the strain vibration in the rotation direction is reduced, thus suppressing noise. There is. Of course, the leakage loss of the magnetic flux can be suppressed to a level at which there is no problem, so that a brushless motor with excellent performance can be realized.

[Brief description of drawings]

FIG. 1 is a diagram showing a stator according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a stator yoke assembly shape according to the first embodiment of the present invention.

FIG. 3 is a front view of an end plate according to the first embodiment of the present invention.

FIG. 4 is a perspective view of a stator yoke according to the first embodiment of the present invention.

FIG. 5 is a sectional view of the hermetic electric compressor according to the first to fourth embodiments of the present invention.

FIG. 6 is a diagram showing a stator according to a second embodiment of the present invention.

FIG. 7 is a diagram showing a stator according to a third embodiment of the present invention.

FIG. 8 is a diagram showing a stator according to a fourth embodiment of the present invention.

FIG. 9 is an exploded view of a stator yoke portion according to a fourth embodiment of the present invention.

FIG. 10 is a perspective view of a stator piece according to a fourth embodiment of the present invention.

FIG. 11A is a schematic diagram showing a magnetic flux flow of a stator according to a fourth embodiment of the present invention. FIG. 11B is a schematic diagram showing a magnetic flux flow of a conventional stator.

FIG. 12 is a view showing a conventional integrated stator.

FIG. 13 is a view showing a conventional split type stator.

[Explanation of symbols]

1 stator 2 rotor 12, 20, 23, 26 Studs of the stator 12a through hole 14, 21, 24, 27 teeth 15 windings 16 odd edition 16a to 16f Overhanging part 17 Clamp pin 18 through holes 21a, 21b groove 22 Wedge 24a, 24b through hole 25 fixing pin 28 Stator piece 28a, 28b Unevenness for meshing 28c, 28d Joint surface 28e Welded part

Claims (4)

[Claims] 1. A stator composed of laminated iron plates constituting an electric motor used in an electric motor for a hermetic compressor, wherein the winding is concentrated around a tooth portion of the stator. A stator for an electric motor for a hermetic compressor, in which end plates are provided on both end faces of the electric motor, the end plates are penetrated through a through hole provided in an iron plate laminated with the end plates, and tightened by fastening means. 2. A stator for an electric motor for a hermetic type compressor, wherein a wedge is inserted between the ends of adjacent tooth portions of the stator according to claim 1. 3. A stator for an electric motor for a hermetic compressor, wherein both ends of a tooth portion on an inner peripheral side of the stator according to claim 1 are fixed by previously press-fitting pins in a stacking direction. 4. A stator composed of laminated iron plates constituting an electric motor used for a hermetic compressor electric motor, wherein the stator tooth portion is configured such that windings are concentrated around the tooth portion, The stator is formed by forming a stator piece by dividing the stator piece in the radial direction at the center in the circumferential direction, and combining the stator piece with the unevenness for engagement provided on the joint surface of the stator piece. A stator for a motor for a hermetic compressor, in which end plates are arranged on both end faces, and the end plates and the laminated plate penetrate through through holes provided in the protrusions and are fixed by fastening means.