JPH11332155A - Stator for motor and closed type motor-operated compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor stator for realizing improved reliability, and a closed type motor-operated compressor fitted with this motor, by surely preventing nonconformities such as the generation of cracks, insulation failures, etc., at the peripheral-side collar of a bobbin due to the effects of coil deformation at magnetizing. SOLUTION: A stator consists of a magnetic pole core 1 having a plurality of magnetic pole teeth 5 arranged radially along a circular part, a bobbin 4 which is made to fit in individual magnetic pole teeth of this magnetic pole core and is for winding coils on its peripheral surface, and a circular yoke iron core covering the end parts projecting from the bobbin of the magnetic pole teeth. The bobbin has an internal peripheral side collar and an external peripheral side collar facing each other and projecting from the end surfaces of the yoke iron core, and to this external peripheral side collar, stoppers 3 for regulating deformation of this external peripheral side collar to its external surface side are fitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor having a stator and a rotor, and more particularly to a structure of a stator and a hermetic electric compressor provided with the motor.

[0002]

2. Description of the Related Art FIG. 20 is a plan view of a conventional electric motor. The electric motor is connected to, for example, a compression mechanism via a rotation shaft S serving as a central axis, and is used for a hermetic electric compressor that drives the compression mechanism. The hermetic electric compressor forms a refrigeration cycle of the air conditioner.

The above-mentioned electric motor is fixedly mounted on a rotor A fixed to a rotating shaft S and a hermetically sealed case constituting a hermetic electric compressor which is arranged with a small gap from the outer peripheral surface of the rotor A. Stator K.

[0004] In order to satisfy energy savings, the motor is usually provided with a variable speed.
Uses a permanent magnet M. The permanent magnet M is formed by hardening magnetic powder and has no magnetic pole at first, and a magnetic pole is formed only by a magnetizing process performed after the assembly is completed.

The stator K includes a magnetic pole core b having a plurality of magnetic pole teeth t connected radially outwardly and connected to each other through an annular portion a through which the rotor A is inserted, and a magnetic pole iron b And a yoke core c provided on the inner peripheral surface thereof. The bobbin d around which the winding m is wound is fitted into each magnetic pole tooth t.

The bobbin d has a cylindrical winding portion e in which a winding m is wound on an outer peripheral surface and a magnetic pole tooth t is fitted on an inner peripheral surface;
An inner peripheral flange portion f provided at one end of the winding portion e and in contact with the magnetic pole core annular portion a in the assembled state, and a yoke provided at the other end of the winding portion e and assembled. An outer peripheral side flange portion g that is in contact with the inner peripheral surface of the iron core c is integrally formed.

As an example of the magnetization in the case of the 6-slot 4-pole specification, a three-phase energization magnetization method is employed. That is, a magnetizing circuit as shown in FIG. 21A is formed, and a magnetizing current (pulse current) flows.

However, in this type of system, all of the magnetizing current flows through the U-phase winding, whereas the V-phase winding and the W-phase winding are halved from each other. It becomes a flow. Therefore, as shown in FIG. 21B, there are a magnet Ma with a strong electromagnetic force and a magnet Mb with a weak electromagnetic force. In order to sufficiently magnetize the magnet Mb having a weak electromagnetic force, it is necessary to flow a very large magnetizing current to greatly increase the total amount of magnetic flux.

[0009]

However, the above-mentioned electric motor has the following disadvantages. That is, FIG.
When a magnetizing current flows in the magnetizing circuit of FIG.
When currents flow in the same direction as in the slot shown in FIG. 1B, the windings wound here pull on each other.

In other words, as shown in FIG. 22A, since no force acts on the winding m wound around the bobbin d before the magnetization, no influence is exerted on the bobbin d itself. Instead, the outer peripheral side flange g maintains a straight shape.

When a magnetizing current is applied, a force Fa is applied to the winding m, as shown in FIGS. 22B and 22C, and the winding m having a rectangular cross section becomes elliptical. spread. At this time, the force of Fb is applied to the upper and lower ends of the winding m by the magnetic pole teeth t.
, And the winding m is pressed toward the center.

Usually, since there is a slight gap between the windings m, the winding m wound on the outer surface acts to enter the gap on the inner surface. Therefore, the winding m is a bobbin d
The outer peripheral side flange portion g is pushed and expanded toward the outer peripheral side by the force of Fc.

Therefore, when a very large magnetizing current is applied, as shown in FIG. 22D, the root of the bobbin outer peripheral flange g (the bent portion of the outer peripheral flange g and the winding portion e) is formed. ) May have cracks, and in some cases, the outer peripheral side flange portion g may fall off and the winding m may protrude, resulting in poor insulation with the yoke core c.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent the occurrence of cracks and insulation failure at the outer flange of the bobbin due to the winding deformation at the time of magnetization. It is an object of the present invention to provide a stator of an electric motor in which a failure is reliably prevented and reliability is improved, and a hermetic electric compressor equipped with the electric motor.

[0015]

In order to satisfy the above object, a stator for an electric motor according to the present invention has a magnetic pole core having a plurality of magnetic pole teeth radially arranged along an annular portion. And a bobbin fitted with each magnetic pole tooth of the magnetic pole core and wound around the outer peripheral surface, and an annular yoke core covering an end protruding from the bobbin of the magnetic pole tooth. The bobbin has an inner peripheral flange portion and an outer peripheral flange portion projecting from the end face of the yoke core and facing each other. Characterized in that a stopper body for preventing the deformation of the member is mounted.

According to a second aspect of the present invention, in the motor stator according to the first aspect, the stopper body includes a pressing portion that contacts an outer surface of the bobbin outer peripheral side flange portion, and a mounting portion that is mounted on the end face of the yoke core. It is characterized by having.

According to a third aspect of the present invention, in the stator for the electric motor according to the second aspect, a projection is provided on the stopper body mounting portion, and the stopper body projection is inserted and fixed to the bobbin outer peripheral flange. An engagement portion is provided.

As claim 4, claims 2 and 3
The reinforcing member is erected between the holding portion and the mounting portion of the stopper body in the stator of the electric motor according to any one of the above.

According to a fifth aspect of the present invention, in the stator for the electric motor according to the first aspect, the stopper body is formed in an annular shape and attached around the entire periphery of the bobbin outer peripheral flange.

According to a sixth aspect of the present invention, in the motor stator according to the first aspect, the stopper body is formed integrally with the bobbin outer peripheral flange. According to a seventh aspect of the present invention, in the motor stator according to the sixth aspect, the stopper body integral with the outer peripheral flange portion of the bobbin is formed in a projection plane of a magnetic pole tooth end protruding from the bobbin.

According to an eighth aspect of the present invention, in the stator for the electric motor according to the sixth aspect, a plurality of stoppers integral with the outer peripheral flange of the bobbin are formed outside the projection surface of the end of the magnetic pole teeth protruding from the bobbin. It is characterized by the following.

The ninth aspect is a second aspect and a sixth aspect.
In the motor stator according to any one of the above, the stopper body is provided with a ridge, and the magnetic pole teeth are provided with a slit that engages with the stopper body ridge.

According to another aspect of the present invention, there is provided a stator for an electric motor, comprising: a magnetic pole core having a plurality of magnetic pole teeth radially arranged along an annular portion; The stator according to claim 1, wherein the stator comprises a bobbin fitted with each magnetic pole tooth and wound with a winding, and an annular yoke core covering an end protruding from the bobbin of each magnetic pole tooth. Is formed so that its axial length is longer than the axial length of the magnetic pole iron core magnetic pole teeth, and its end surface protrudes from the magnetic pole iron core magnetic pole tooth end surface, and the bobbin has an inner peripheral side flange portion and an outer peripheral side flange portion. The outer peripheral flange surface is opposed to the yoke core projecting surface.

According to another aspect of the present invention, there is provided a hermetic electric compressor in which an electric motor portion and a compression mechanism portion are connected to each other via a rotary shaft in the hermetically sealed case. In the hermetic electric compressor in which the main body is housed, the electric motor portion is mounted on and fixed to a hermetically sealed case, and is arranged with a small gap in the stator and fitted to the rotating shaft. The stator includes a magnetic pole core having a plurality of magnetic pole teeth radially arranged along the annular portion, and the stator is fitted with each magnetic pole tooth of the magnetic pole core, and the winding is wound. And a toroidal yoke core covering an end of each magnetic pole tooth protruding from the bobbin. The bobbin protrudes from the end face of the yoke core and faces the inner peripheral side flange portion facing each other. And the outer peripheral side flange portion. Or the compression mechanism portion, characterized in that a stopper member for restricting the deformation of the outer surface of the bobbin outer periphery flange portion.

By adopting the means for solving the above problems, it is possible to reliably prevent the occurrence of defects such as cracks and insulation failure in the outer flange of the bobbin due to the effect of winding deformation during magnetization.

[0026]

1 to 4 show an embodiment according to claims 1 to 4. FIG. FIG. 1 shows a state in which a stopper body 3 described later is attached to a predetermined portion after the magnetic pole core 1 is assembled into the yoke core 2.

The yoke core 2 has a substantially annular cross section, and bobbins 4 project from both upper and lower end surfaces. The bobbin 4 is fitted into the magnetic pole teeth 5 of the magnetic pole core 1 shown in FIG. 4 and has a winding part 4a around which the winding m is wound, an inner peripheral side flange part 4b contacting the magnetic pole core 1, and The upper and lower ends of the inner flange 4b and the outer flange 4c project from the upper and lower end surfaces of the magnetic pole core 1 and the yoke core 2, respectively. opposite.

FIG. 2 shows a state where the stopper assembly 3 is attached to complete the stator assembly 6. That is,
The stopper body 3 has an L-shaped cross section, and one part thereof rests on the end face of the yoke core 2 and the other part is a bobbin outer peripheral side flange part 4c.
Mounted on the outside.

Here, for the first time, the magnetizing process is performed with the stator assembly 6 positioned on the peripheral surface of the rotor (not shown). FIG. 3 shows the stopper body 3 in an enlarged manner. It has a rectangular mounting portion 3a, which is one of the above-mentioned portions, and a rectangular pressing portion 3b integrally bent at an angle of 90 ° along one side edge of the mounting portion 3a.

A triangular reinforcing member 7 is erected between the mounting portion 3a and the pressing portion 3b substantially at an intermediate portion in the longitudinal direction between the mounting portion 3a and the pressing portion 3b. That is, the reinforcing member 7 is provided on the L-shaped inner surface side of the mounting portion 3a and the pressing portion 3b, and reinforces them.

A projection 8 is provided at the upper end of the mounting portion 3a and on both left and right sides. These projections 8
Protrudes toward the outer surface of the mounting portion 3a, has a circular base at the base end, and has a conical shape at the front end slightly larger than the diameter of the base end.

As shown in FIGS. 4A and 4B, when the stopper body 3 is attached to a predetermined portion, the bobbin outer peripheral flange 4
The holding portion 3b abuts on the outer surface of c, and the mounting portion 3a abuts on the end face of the yoke core 2. The bobbin outer peripheral side flange portion 4c is provided with an insertion hole 9 as an engagement portion in advance, and the projection 8 provided on the stopper body pressing portion 3b is inserted into the insertion hole 9 and fixed. . At this time, the protrusion 8
From the setting of the shape and dimensions, the tip of the projection 8 is inserted while being deformed to some extent.

As shown in FIG. 2 again, the stopper 3
The stator assembly 6 after the mounting is set on the outer peripheral portion of the rotor to form a magnetized circuit similar to the conventional one, and magnetized.
At this time, an electromagnetic force acts to deform the bobbin outer peripheral side flange portion 4c to the outer surface side by the winding wound around the bobbin 4.

However, the outer flange 4c of the bobbin 4
Is supported on its outer surface by a holding portion 3b of the stopper body 3, and the stopper body 3 receives an electromagnetic force acting on the bobbin outer peripheral side flange 4c.

The stopper body 3 includes a holding portion 3b and an attaching portion 3a attached to the yoke core 2, and a reinforcing member 7 is provided between the holding portion 3b and the attaching portion 3a. Receiving the electromagnetic force associated with magnetism has no effect and no deformation.

Therefore, the deformation of the bobbin outer peripheral side flange portion 4c at this time is prevented, and no crack is formed at the base. Insulation failure can be reliably prevented, leading to improvement in reliability.

FIGS. 5 to 7 relate to a second embodiment of the present invention. As shown in FIG. 5, a magnetic pole iron 5 is fitted with a bobbin 4 having a winding m to form a magnetic pole core 1, and a yoke core 2 is incorporated therein to form a stator assembly 6, which will be described later. The state where the stopper body 3A is attached to a predetermined portion is shown.

The stopper body 3A has a hexagonal ring shape, and two sets are prepared so as to be fitted into a pair of bobbin outer peripheral side flange portions 4c protruding from both end surfaces of the yoke core 2. In addition,
The inner diameter of the hexagonal ring-shaped stopper body 3A is formed to be the same as the outer diameter of the bobbin outer peripheral flange 4c.

FIG. 6 shows a state where the stopper body 3A is attached to a predetermined portion. The stopper body 3A is fitted over the entire circumference of the bobbin outer peripheral side flange portion 4c having the same hexagonal shape, starting from a hexagonal ring shape.

As shown in FIG. 7, even when an electromagnetic force acts to deform the outer peripheral side flange portion 4c of the bobbin 4 to the outer surface side during magnetization, the stopper body 3A is formed on the outer surface of the outer peripheral side flange portion 4c. Since it is fitted over the entire circumference, the stopper body 3A receives electromagnetic force.

Therefore, the deformation of the bobbin outer peripheral side flange portion 4c at this time is prevented, and no crack is formed at the base. Insulation failure can be reliably prevented, which leads to improvement in reliability.

Further, since the stopper body 3A is formed in a ring shape, the work is completed only by inserting the stopper body into a predetermined portion after the completion of the stator assembly 6, and the number of mounting steps can be reduced. 8 to 11 relate to the sixth and seventh embodiments.

As shown in FIGS. 8A, 8B and 8C, a stopper 3B is formed integrally with the bobbin 4A. That is, the bobbin 4A includes the stopper 3B. The bobbin 4A is formed along a side edge of a winding portion 4a having a rectangular cylindrical shape, a winding m wound around the outer peripheral surface, and fitted to the magnetic pole teeth 5 on the inner peripheral surface. Inner circumference flange 4
b and the outer peripheral side flange 4c provided along the other side edge are provided integrally.

Particularly, in the bobbin outer peripheral flange portion 4c, the winding portion 4 is provided only on the lower side of the drawing so as to be continuous with the lower end of the winding portion 4a.
A stopper 3B having the same width as the width a is provided. The stopper portion 3B is an inclined surface which is inclined so as to gradually protrude from the lower end edge of the outer peripheral side flange portion 4c toward the winding portion 4a, and both side portions have a closed triangular shape. Then, as described later, this upper end surface functions as a substantial stopper.

As shown in FIG. 9, when the magnetic pole core 1 having the winding m wound around the magnetic pole teeth 5 is fitted into the yoke core 2 to form the stator assembly 6, the end portion on which the stopper portion 3B is provided. Is the insertion-side end of the magnetic pole core 1.

The bobbin outer peripheral flange 4c of the magnetic pole teeth 5
Is fitted into a fitting groove 2a provided on the inner periphery of the yoke core 2. The area of the upper end surface of the stopper portion 3B is the area of the end surface of the magnetic pole teeth 5 protruding from the bobbin outer peripheral flange 4c. It is formed so as to be smaller than that. That is, as shown particularly in FIG. 11A, the stopper 3B is formed in the projection plane of the magnetic pole teeth 5.

FIG. 10 shows a state where the stator assembly 6 is completed by fitting the magnetic pole core 1 into the yoke core 2. Since the stopper 3B is formed in the projection plane of the magnetic pole teeth 5,
Does not adversely affect the work at the time of fitting.

The axial length of the magnetic pole teeth 5 protruding from the bobbin outer peripheral flange 4c is the same as the axial length of the yoke core 2, and the upper and lower stoppers 3B are provided from the upper and lower end surfaces of the yoke core 2. Protrude.

As shown in FIG. 11B, a part of the bobbin outer peripheral side flange portion 4c is formed as a stopper portion 3B with a triangular cross section. In addition, the contact side of the yoke core 2 is formed to be thick, and this rigidity becomes extremely large.

Even when an electromagnetic force acts to deform the outer peripheral flange 4c of the bobbin 4A toward the outer surface during the magnetization, the stopper 3B is integrally formed with the outer peripheral flange 4c to increase rigidity. Therefore, it is not affected by electromagnetic force. Further, it is not necessary to separately attach the stopper body 3B, and the number of working steps can be reduced.

FIGS. 12 and 13 relate to the eighth embodiment. FIGS. 12A and 12B show a bobbin 4B, which has a rectangular tubular winding portion 4a, an inner peripheral flange portion 4b,
The outer peripheral side flange portion 4c is provided, and a stopper portion 3B is provided at a portion of the outer peripheral side flange portion 4c continuous with the winding portion 4a, as described above.

Here, the stopper portion 3B is also provided at a position above the outer peripheral side flange portion 4c and not connected to the winding portion 4a, that is, at a position facing both sides of the winding portion 4a. The upper stopper portion 3B has an inclined surface that gradually projects from the upper end edge of the outer peripheral side flange portion 4c to substantially the same position as the upper end edge of the winding portion 4a.

FIG. 13A shows a state where the magnetic pole core 2 is incorporated into the yoke core 1 by using a fitting jig 10 described later.
FIG. 13B shows a state where the stator assembly 6 is assembled.

The fitting jig 10 is a disc-shaped jig main body 1.
0a and a plurality of push legs 10 provided along the axial direction at predetermined intervals at the peripheral end of the lower surface of the jig body 10a.
b.

In order to incorporate the magnetic pole core 1 into the yoke core 2,
The jig body 10a of the fitting jig 10 abuts on the upper edge of the bobbin 4B, and the tip of each push leg 10b abuts on the upper end of the magnetic pole teeth 5 protruding from the bobbin outer flange 4c. 1
Press 0.

That is, the stopper 3B provided on the upper side of the bobbin outer peripheral flange 4c is provided outside the projection plane of the magnetic pole teeth 5 protruding from the outer peripheral flange 4c. Sometimes, the upper stopper 3B does not hinder a little, and the workability is not impaired.

In the state where the stator assembly 6 is completed,
A stopper portion 3B provided on the lower side protrudes from the lower end surface of the yoke core 2 to reinforce the lower outer peripheral side flange portion 4c of the bobbin 4B, and the upper stopper 3B protrudes from the upper end surface of the yoke core 2 to prevent the bobbin 4B from moving. The upper outer peripheral flange 4c is reinforced.

At the time of magnetization, even if an electromagnetic force acts to deform the outer peripheral flange 4c of the bobbin 4B projecting from the upper and lower end surfaces of the yoke core 2 to the outer surface side, it protrudes from the upper and lower end surfaces of the yoke core 2. Stopper portion 3 formed integrally with outer peripheral side flange portion 4c
B prevents deformation. Further, there is no need to separately attach a stopper body, and the number of working steps can be reduced.

FIGS. 14 to 16 relate to a ninth embodiment of the present invention. As shown in FIGS. 14A and 14B, a slit 11 is provided on the end face of each magnetic pole tooth 5 constituting the magnetic pole core 1A. Each slit 11 is a magnetic pole core 1A
However, it may be provided only on the end face of the lower end portion of the magnetic pole tooth 5 in relation to the stopper body 3C described later.

As shown in FIGS. 15A, 15B and 15C,
The bobbin 4C used here is a rectangular cylindrical winding part 4a.
And an inner side flange 4b provided along one side edge of the winding portion 4a, and an outer side flange 4c provided along the other side edge.
The basic configuration consisting of

A stopper 3C, which is a stopper, is provided integrally with the bobbin 4C at a position below the outer flange 4c and at a position continuous with the winding portion 4a. The stopper portion 3C forms an inclined surface that is inclined so as to gradually and obliquely project from the lower edge of the outer peripheral side flange portion 4c to the outer surface side. The maximum protrusion amount of the upper end of the stopper portion 3C is substantially the same as the depth dimension of the slit 11 provided in the magnetic pole tooth 5.

As shown in FIGS. 16 (A) and 16 (B), when the stator core 6 is completed by assembling the magnetic pole core 1A into the yoke core 2, the upper end surface of the stopper portion 3C is attached to the end surface of the yoke core 2. It abuts and reinforces the bobbin outer peripheral flange 4c during magnetization.

In this state, the ridge 12 provided on the upper end surface of the stopper portion 3C engages with the slit 11 of the magnetic pole tooth 5, but the ridge 12 also projects to the same extent as the end surface of the magnetic pole tooth 5. The end face of the ridge 12 comes into contact with the inner peripheral surface of the yoke core 2.

Therefore, the yoke core 2 supports the stopper 3C integral with the bobbin 4C not only at the end face but also at the inner face, so that even if a large electromagnetic force is generated at the time of magnetization, the deformation of the bobbin outer peripheral side flange 4c occurs. To prevent

FIGS. 17 (A), 17 (B) and 17 (C) show a tenth embodiment.
According to the embodiment. The magnetic pole core 1B includes a plurality of magnetic pole teeth 5A radially arranged along an annular portion (not shown), and a bobbin 4 around which a winding is wound is fitted into each magnetic pole tooth 5A. Then, an annular yoke core 2A is incorporated into an end of each magnetic pole tooth 5A protruding from the bobbin 4,
These constitute the stator assembly 6A.

The feature of this embodiment is that the yoke core 2
A is that the axial length of A is longer than the axial length of the magnetic pole core 1B. Therefore, the yoke iron core 2A
Upper and lower ends of the magnetic pole iron core magnetic pole teeth 5A protrude from upper and lower end surfaces, respectively.

The bobbin 4 is provided with a winding portion 4a fitted into the magnetic pole teeth 5A, an inner peripheral side flange portion 4b provided along one side edge of the winding portion 4a, and provided along the other side edge. And an outer peripheral side flange portion 4c. In a state where the magnetic pole core 1B is incorporated into the yoke core 2A, the bobbin outer peripheral side flange portion 4c is formed.
Faces the inner peripheral surface of the yoke core 2A.

Then, as described above, the yoke iron core 2A
The upper and lower end portions of the bobbin outer peripheral side flange portion 4c particularly protrude from the upper and lower end surfaces of the magnetic pole teeth 5A.
Abut on the portion protruding from the magnetic pole teeth 5A.

Therefore, even if a large electromagnetic force is generated at the time of magnetization and the bobbin outer peripheral flange 4c is to be deformed outward, the flange 4c is supported by the vertically projecting portion of the yoke core 2A. There is no crack at the base. Insulation failure can be reliably prevented, which leads to improvement in reliability.

Further, the separate component (stopper body) as described above is not required, and a desired effect can be obtained by avoiding an increase in component cost and an increase in the number of mounting steps with a slight design change.
18 and 19 relate to the eleventh embodiment.

FIG. 18 shows a hermetic electric compressor. In the figure, reference numeral 20 denotes a sealed case, in which an electric compressor main body 24 in which an electric motor portion 22 is connected to an upper portion via a rotating shaft 21 and a compression mechanism portion 23 is connected to a lower portion is accommodated. .

The electric motor section 22 includes a stator 6 attached to and fixed to the sealed case 20, and a rotor 6 disposed in the stator 6 with a small gap therebetween and fitted to the rotating shaft 21. 25.

The compression mechanism section 23 forms a two-cylinder rotary compression mechanism in this case. This compression mechanism 23
Although a detailed description is omitted, a stopper 3D, which will be described later, is mounted on a flange 27 for closing the upper cylinder 26 in particular.

The stator 6 includes a magnetic pole core 1 having a plurality of magnetic pole teeth 5 radially arranged along the annular portion as shown in FIG. 1, and each magnetic pole tooth of the magnetic pole core 1. The magnetic pole teeth 5 are formed of a bobbin 4 fitted around the coil 5 and wound around the end of the magnetic pole teeth 5 protruding from the bobbin 4.

As shown in FIG. 18, the bobbin 4 projects from the end face of the yoke core 2 and has an inner peripheral flange 4b and an outer peripheral flange 4c facing each other. The outer peripheral surface of the outer peripheral side flange portion 4c faces the inner peripheral surface of the closed case 20.

As shown in FIGS. 19A and 19B, the stopper body 3D is formed in a substantially annular shape in plan view, and has a substantially L-shaped cross section. A pressing portion 3d, which is a vertical piece, is formed integrally with the outer peripheral edge of the mounting portion 3c, which is a horizontal piece.

The outer diameter of the holding portion 3d is the same as that of the closed case 2.
0, and the inner diameter is designed to substantially match the outer diameter of the bobbin outer flange 4c.

As shown in FIG. 18 again, in the compressor configured in this manner, the mounting portion 3c of the stopper body 3D mounted on the flange 27 of the compression mechanism 23
Is placed on the flange 27, and the holding portion 3d is
It comes into contact with the inner peripheral wall and is inserted between the sealed case 20 and the bobbin outer peripheral flange 4c.

When the motor section 22 is magnetized in this state,
The bobbin outer peripheral side flange portion 4c tends to fall to the closed case 20 side which is the outer surface side. However, the pressing portion 3d of the stopper body 3D is interposed between the bobbin outer peripheral side flange portion 4c and the sealed case 20, and reliably prevents the bobbin outer peripheral side flange portion 4c from being deformed to the outer surface side.

In the above embodiment, the stopper 3D is formed in an L-shaped cross section, and the mounting portion 3c is mounted on the flange 27 constituting the compression mechanism 23. However, the present invention is not limited to this. Instead, it may be arranged between the bobbin outer peripheral side flange portion 4c and the sealed case 20 as a configuration having only the pressing portion 3d. In this case, it is unavoidable that means for attaching and fixing the stopper body 3d of only the holding portion to the closed case 20 involves considerable difficulty.

[0081]

As described above, according to the present invention, it is possible to reliably prevent the occurrence of cracks or poor insulation at the outer flange of the bobbin due to the effect of winding deformation during magnetization. There are effects such as improvement in reliability.

[Brief description of the drawings]

FIG. 1 is a view for explaining an assembling operation of a stator assembly according to an embodiment of the invention of claims 1 to 4;

FIG. 2 is a view of an assembled stator according to the embodiment of the present invention.

FIG. 3 is a view of a stopper body according to the embodiment of the present invention.

FIG. 4 is a diagram of a stopper body and a bobbin outer peripheral side flange portion according to the embodiment of the present invention.

FIG. 5 is a view showing an assembly of a stator according to the embodiment of the invention of claim 5;

FIG. 6 is a view of an assembled stator according to the embodiment of the present invention.

FIG. 7 is a view of a stopper body and a bobbin according to the embodiment of the present invention.

FIG. 8 is a view of a bobbin according to the embodiment of claims 6 and 7.

FIG. 9 is a view showing a state in which the magnetic pole core is incorporated in the yoke core according to the embodiment of the present invention;

FIG. 10 is a view of an assembled stator according to the embodiment of the present invention.

FIG. 11 is a view of a stopper according to the embodiment of the present invention.

FIG. 12 is a view of a stopper body according to the embodiment of the invention of claim 8;

FIG. 13 is a diagram showing a state where a magnetic pole core is incorporated in a yoke core and a stator according to the embodiment of the present invention.

FIG. 14 is a diagram of a magnetic pole core according to the embodiment of the ninth invention.

FIG. 15 is a view of a bobbin according to the embodiment.

FIG. 16 is a view of an assembled stator and a part thereof according to the embodiment of the present invention.

FIG. 17 is a diagram showing a part of a stator according to the embodiment of the invention of claim 10;

FIG. 18 is a view of a hermetic electric compressor according to an embodiment of the invention of claim 11;

FIG. 19 is a view of a stopper body according to the embodiment of the present invention.

FIG. 20 is a cross-sectional view of a conventional electric motor.

FIG. 21 is a diagram illustrating a conventional electric circuit at the time of magnetization and a diagram illustrating a flow of magnetic flux.

FIG. 22 is a view for explaining a conventional bobbin deformation state during magnetization.

[Explanation of symbols]

 5 magnetic pole teeth, 1 magnetic pole iron, m winding, 4 bobbin, 2 yoke core, 4b inner flange, 4c outer flange, 3 stopper body, 3b holding part, 3a: mounting portion, 8: projecting portion, 9: engaging portion (insertion hole), 7: reinforcing member, 3A: ring-shaped stopper body, 12: ridge, 11: slit, 3B: stopper portion, 3D: ( Stopper body for hermetic electric compressor).

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H02K 29/00 H02K 29/00 Z

Claims (11)

[Claims] 1. A magnetic pole core having a plurality of magnetic pole teeth radially arranged along an annular portion, and a bobbin fitted to each magnetic pole tooth of the magnetic pole core and having a winding wound on an outer peripheral surface thereof. A stator of an electric motor comprising an annular yoke core covering an end protruding from the bobbin of the magnetic pole teeth, wherein the bobbin protrudes from the yoke core end face and has an inner peripheral side flange portion facing each other; A stator for an electric motor having an outer peripheral side flange portion, wherein a stopper body for preventing deformation of the outer peripheral side flange portion to the outer surface side is attached to the bobbin outer peripheral side flange portion. 2. The stopper body according to claim 1, wherein the stopper body includes a pressing portion that contacts an outer surface of the bobbin outer peripheral side flange portion, and an attaching portion that is attached to the end face of the yoke core.
Motor stator as described. 3. The stopper mounting portion is provided with a projection, and the bobbin outer flange is provided with an engagement portion into which the stopper projection is inserted and fixed. 2. The stator of the electric motor according to 2. 4. The stator for an electric motor according to claim 2, wherein a reinforcing member is provided between the holding portion and the mounting portion of the stopper body. 5. The stator for an electric motor according to claim 1, wherein said stopper body is formed in an annular shape and is attached over the entire periphery of a bobbin outer peripheral side flange portion. 6. The stator for an electric motor according to claim 1, wherein said stopper body is formed integrally with said bobbin outer peripheral side flange portion. 7. The stator for an electric motor according to claim 6, wherein the stopper body integral with the bobbin outer peripheral flange is formed in a projection plane of a magnetic pole tooth end protruding from the bobbin. 8. A fixing device for an electric motor according to claim 6, wherein a plurality of stopper bodies integral with the outer peripheral side flange portion of the bobbin are formed outside a projection surface of a magnetic pole tooth end protruding from the bobbin. Child. 9. A stopper according to claim 2, wherein a protrusion is provided on said stopper body, and said magnetic pole tooth is provided with a slit for engaging said protrusion on said stopper body. A stator for an electric motor according to any of the claims. 10. A magnetic pole core having a plurality of magnetic pole teeth radially arranged along an annular portion, a bobbin fitted with each magnetic pole tooth of the magnetic pole core and wound with a winding; A stator for an electric motor comprising an annular yoke core covering an end protruding from a bobbin of a magnetic pole tooth, wherein the yoke core has an axial length longer than the axial length of the magnetic pole core magnetic pole teeth. The bobbin has an inner peripheral side flange portion and an outer peripheral side flange portion, and the outer peripheral side flange surface faces the yoke iron core projecting surface. And the stator of the electric motor. 11. A hermetic electric compressor in which an electric compressor body in which an electric motor portion and a compression mechanism portion are connected via a rotating shaft is housed in the hermetically sealed case, wherein the electric motor portion is provided in the hermetically sealed case. A stator that is mounted and fixed, and a rotor that is disposed within the stator with a small gap and that is fitted to the rotating shaft. The stator is arranged radially along an annular portion. A magnetic pole core having a plurality of magnetic pole teeth to be arranged, a bobbin fitted with each magnetic pole tooth of the magnetic pole core and wound with a winding, and an annular shape covering an end protruding from the bobbin of each magnetic pole tooth The bobbin projects from the end face of the yoke core, has an inner peripheral side flange portion and an outer peripheral side flange portion facing each other, and the bobbin is provided in the closed case or the compression mechanism portion. Restricts deformation of outer flange to outer surface A hermetic electric compressor characterized by having a stopper body.