JP2002291209A - Electric motor for sealed compressor, its manufacturing method and refrigerating cycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric motor of low vibration and noise, and its manufacturing method so that the winding of high space factor can be manufactured and the vibration and noise generated by the electric motor are suppressed. SOLUTION: When coils 15 are inserted into the teeth 12 of a stator 10 in concentrated winding through a slot opening 16 after coils 15 are previously wound in ring, a process that coil 15 is inserted into the above teeth 12 which are not mutually adjacent is simultaneously repeated several times.

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 and a method for manufacturing the same. The hermetic compressor has a reduced amount of resin material used and is less likely to cause clogging of a capillary tube. Related to the refrigerating cycle.

[0002]

2. Description of the Related Art In recent years, electric motors having salient poles have been used in hermetic compressors from the viewpoint of small size and high efficiency.

[0003] With respect to a motor having salient pole portions, as disclosed in Japanese Patent Application Laid-Open No. 7-46782, a coil is formed on a stator core through an insulating member formed of a resin or the like called an insulator. Have been. Generally, the coil is formed directly by a winding machine having a nozzle.
The straight winding method of winding the teeth is adopted.

[0004] In the electric motor manufactured as described above, as disclosed in the publication, a space is formed in a slot for accommodating a coil wound on an adjacent tooth, and a space between adjacent coils is formed. Insulation is ensured.

[0005] However, in the straight winding method using the integral stator core as described above, from the viewpoint of securing the nozzle passage space in the slot, the space in the slot (as a result,
This is a space for securing insulation), and it is difficult to further improve the space factor, and it has been impossible to realize further small size and high efficiency.

Japanese Patent Application Laid-Open No. Hei 9-191588 discloses a manufacturing method in which a stator core is wound in a straight line in a substantially linearly developed state, and then formed into an annular shape to form a stator. With this manufacturing method, it is possible to obtain a stator with a significantly improved space factor. Then, with the improvement of the space factor, it is necessary to insulate adjacent coils housed in the same slot. As an interphase insulation method, the gazette includes:
A technical idea is disclosed in which the slot insulating paper has a structure having a bent portion, and when the stator core is formed into an annular shape, the bent portion serves as a protrusion and is disposed between the coils.

[0007]

However, in the above-described manufacturing method, the stator core is wound in a straight line in a state where the stator core is developed in a substantially straight line, and then formed into an annular shape to form a stator.
Since the yoke portion of the stator, which is the main path of magnetic flux, is cut at the joint portion, considering the dimensional variation and the like, there are a plurality of minute gaps in the yoke portion, and the magnetic resistance increases, Iron loss also increases due to a short circuit between the laminations at the joint.

[0008] Further, in the case where the laminations are fixed to each other by a half-punching method or welding of the outer periphery, such as in a hermetic compressor, it is difficult to secure the joining strength at the time of dropping.
In the case of joining by TIG welding or the like, iron loss increases due to a short circuit between the laminations of the welded portion. Also, in a hermetic compressor in which the outer periphery of the stator is shrink-fitted to the shell, the inner diameter dimensional accuracy can be secured only by the outer diameter dimensional accuracy of the stator core, and the gap tends to become uneven, and There was also a problem in terms of noise. Further, when the joining portion protrudes into the slot, the slot insulating paper may be damaged.

The present invention provides a low-vibration, low-noise electric motor which enables a high space factor winding and suppresses vibration and noise due to a sharp change in magnetic flux, and a method for manufacturing the same. The purpose is to:

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a method for inserting coils in a concentrated winding form through slots open into the teeth after the coils are wound in advance in an annular shape. The step of inserting the coil into the teeth simultaneously is repeated M times. This facilitates the insertion of the coil, enables automation including insulation, and improves the space factor. In addition, the rigidity of the stator core is improved, and the winding vibration is also suppressed, so that the vibration and noise due to the annular vibration of the core can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is characterized in that a stator core formed integrally with a plurality of teeth having a wide portion in the circumferential direction at the tip end and an annular yoke portion is provided in advance in an annular shape. An interphase insulating paper that insulates between a coil that is wound around the tooth and then inserted into the coil by turning a slot open into a concentrated winding and an adjacent heterophase coil inserted and housed in a slot formed by the tooth and the yoke. And a method of manufacturing an electric motor comprising a stator having salient pole portions and a rotor having permanent magnets, wherein the stator is formed of a slot insulating paper that insulates the coil housed in the slot and the stator core. A method for manufacturing a motor, wherein a step of simultaneously inserting a coil into the teeth not adjacent to each other is repeated M times (M is an integer of 2 or more) times, Edge structure tends to take, to improve the insulating properties, the effect is obtained that reliability is improved.
In addition, it is possible to perform winding without confusing coils of different phases in the same slot. Furthermore, the coil insertability is improved, and a high space factor winding is enabled, and the efficiency of the motor is improved.

According to a second aspect of the present invention, a coil wound in an annular shape such that the inner diameter width of the coil is larger than the wide portion of the teeth which is widened in the circumferential direction of the tooth tip is inserted into the teeth. In the process, after inserting the coil deeper than the teeth wide part, reduce the inner diameter width of the coil,
The method for manufacturing a motor according to claim 1, wherein the height of the inner diameter of the coil is increased in accordance with the reduction of the inner diameter width, and the space factor and the insulation are improved.

According to a third aspect of the present invention, in the step of inserting the coil, the height of the inner diameter of the coil is increased in accordance with the reduction of the inner diameter width, thereby increasing the axial end of the stator core and the axial end of the coil. The method for manufacturing a motor according to claim 2, wherein a sufficient insulation space distance is secured between the inner diameter portion and the inner diameter portion of the portion, wherein the insulator can be eliminated by improving the insulating property, Since the amount of resin used can be reduced, it is particularly suitable for use in hermetic compressors.

According to a fourth aspect of the present invention, in each of the coil inserting steps, an interphase insulating paper having a substantially U-shape having a concave cross section on the coil side is inserted together with the coil. Item 3. The method for manufacturing an electric motor according to any one of Items 3, wherein when the conventional insulating paper is installed after inserting the coil, the insulating paper must be installed manually and the insulating paper may be bent. According to the invention, the interphase insulating paper can be easily installed, and can be automated by a machine.

According to a fifth aspect of the present invention, coil insertion is performed in a state in which a dummy member is disposed in a slot in which a coil is housed and a portion of the slot in which a coil of an adjacent tooth without a coil is housed is housed. The method for manufacturing a motor according to any one of claims 1 to 5, wherein coils of different phases in the same slot are divided into right and left by using the dummy member. The space factor and pressure resistance are improved. In addition, since the interphase insulating paper can be easily inserted, the insertion process of the interphase insulating paper can be automated.

According to a sixth aspect of the present invention, in the method of manufacturing the electric motor according to the fifth aspect, the dummy member disposed in the slot portion is extruded following the advance of the coil inserted into the teeth. Accordingly, the space factor and the pressure resistance are improved, and the insertion of the interphase insulating paper is facilitated, so that the step of inserting the interphase insulating paper can be automated. In addition, a special device and process for extruding the dummy member are not required.

According to a seventh aspect of the present invention, the cross-sectional area of the insertable portion into which the coil is inserted is smaller than the cross-sectional area of the dummy member, of the total cross-sectional area of the slot that can be wound. In the method of manufacturing a motor according to the above, since there is no interference between the interphase insulating papers in the step of inserting the coil, the coil can be stably inserted, and the effect of improving the space factor can be obtained.

[0018] According to an eighth aspect of the present invention, the dummy member comprises:
The method for manufacturing a motor according to any one of claims 5 to 7, wherein the dummy member has a tapered shape such that a cross-sectional area increases toward a leading end in a drawing direction. Extrusion is facilitated, and the effect of reducing coil damage is obtained.

According to a ninth aspect of the present invention, the dummy member comprises:
The method for manufacturing a motor according to any one of claims 5 to 7, wherein the dummy member has a tapered shape such that a cross-sectional area decreases toward a leading end in a removing direction. The effect of shaping the coil previously inserted by the dummy member itself in the slot and facilitating insertion of the next coil is obtained.

According to a tenth aspect of the present invention, any one of the first to ninth aspects is characterized in that the coils are inserted into the slots at the same time by the same number of coils of each phase which are not adjacent to each other.
In the method for manufacturing a motor described in the section, since the sum of the coil inner diameter areas of the respective phases is the same, an effect that the induced voltages of the respective phases are the same can be obtained. In addition, since the resistance of the coils of each phase becomes the same, the effect of stabilizing the current is obtained, and by these effects, the driving is stabilized and the electric or magnetic imbalance is reduced.

According to an eleventh aspect of the present invention, in the electric motor according to the tenth aspect, a three-phase winding is applied, and M = 2 when the number of slots is even and M = 3 when the number of slots is odd. The production method is improved because the number of steps is reduced.

According to a twelfth aspect of the present invention, after inserting coils of different phases inserted in the same slot, both ends in the axial direction of the coil are shaped, and different coils inserted in the same slot are inserted. 2. The phase coil according to claim 1, wherein the phase coils are in contact with each other via an interphase insulating paper.
The method for manufacturing an electric motor according to any one of claims 1,
The rigidity of the stator core is improved, there is an effect of suppressing winding vibration, and there is an effect of suppressing annular vibration generated when adjacent teeth attract each other, so that vibration and noise are reduced. Further, when used also as the insulating paper of the slot open portion, the number of processes and materials used can be reduced in a state where the insulating property is sufficiently ensured.

According to a thirteenth aspect of the present invention, there is provided a stator core formed integrally with a plurality of teeth having a wide portion in the circumferential direction at a tip end and an annular yoke portion, and the stator core is formed after being wound in advance. A coil inserted into the tooth via a slot open, an interphase insulating paper for insulating between adjacent different-phase coils inserted and stored in a slot formed by the tooth and the yoke, and a coil stored in the slot. In a motor having a stator having salient pole portions made of slot insulating paper for insulating the stator core and a rotor having permanent magnets, the stator core of the slot insulating paper has both ends in the axial direction. A motor having a folded corner formed in a notch shape, wherein the insulating paper does not protrude into the inner diameter of the stator, or has a withstand voltage or reliability. It is possible to reduce the protrusion extent does not affect the like, highly reliable motor can be obtained.

According to a fourteenth aspect of the present invention, after the stator winding is completed, the slot insulation is formed by forming notched corners at both ends in the axial direction of the stator core of the slot insulating paper. 14. The electric motor according to claim 13, wherein the folded portion of the paper does not protrude inward from the inner diameter of the stator, and a highly reliable electric motor is obtained without the insulating paper protruding into the inner diameter of the stator.

According to a fifteenth aspect of the present invention, a step for accommodating a part of a folded portion formed on both ends of the stator core of the slot insulating paper is provided on both ends of the slot of the stator core. The electric motor according to claim 13 or 14, wherein the slot insulating paper folded portion hits the edge of the slot on both end faces of the stator core, so that the insulating property is improved. In particular, the effect of reducing the dielectric breakdown due to the stress on the slot insulating paper due to the stress of the winding is obtained.

According to a sixteenth aspect of the present invention, there is provided an electric motor manufactured by the manufacturing method according to any one of the first to twelfth aspects, or one of the thirteenth to fifteenth aspects. This is a hermetic compressor characterized by using the electric motor described above, while maintaining the advantages of downsizing of concentrated winding and reduction of the amount of copper used, with high efficiency, low vibration,
Low noise can be realized.

[0027] In the invention described in claim 17, the refrigerant is HFC
17. The hermetic compressor according to claim 16, wherein the compressor has high efficiency, low vibration, low noise, and does not require the use of an insulator. The effect is obtained.

[0028] The invention according to claim 18 is the hermetic compressor according to claim 16, wherein the refrigerant is a natural refrigerant. The compressor has high efficiency, low vibration and low noise and uses an insulator. Since it is not necessary to use the capillary tube, it is possible to obtain an effect that the capillary tube is hardly clogged.

According to a nineteenth aspect of the present invention, there is provided a refrigeration cycle equipped with the hermetic compressor according to any one of the sixteenth to eighteenth aspects, wherein the power consumption is reduced while the efficiency is high. Therefore, improvement in reliability and extension of life can be realized.

According to a twentieth aspect of the present invention, there is provided an air conditioner equipped with the refrigeration cycle according to the nineteenth aspect, wherein the power consumption can be reduced while the efficiency is high, the reliability is improved, and the life is extended. Can be realized.

According to a twenty-first aspect of the present invention, there is provided a refrigerator equipped with the refrigeration cycle according to the nineteenth aspect, which is capable of reducing power consumption while being highly efficient, realizing improvement in reliability and extension of life. it can.

According to a twenty-second aspect of the present invention, there is provided an electronic circuit cooling system equipped with the refrigeration cycle according to the nineteenth aspect, and particularly with the rapid growth of the IT industry in recent years, a relay station for an Internet host station or mobile communication. Electronic circuits are concentrated everywhere, such as in stations, and there is an urgent need for further energy savings.In spite of high efficiency, it is possible to reduce power consumption while achieving high efficiency, and achieve improved reliability and longer life. .

[0033]

Embodiments of the present invention will be described below.

FIG. 1 is a sectional view of an electric motor according to one embodiment of the present invention.

FIG. 2 is a diagram showing a method of manufacturing an electric motor according to one embodiment of the present invention.

FIGS. 3A and 3B are views showing a method of inserting a coil into a motor according to an embodiment of the present invention. FIG. 3A is a view from the axial end face side of a stator core, and FIG.

The stator 10 has a wide portion 1 extending in the circumferential direction of the tip.
The coils 15U1, 15V1, and 15W wound in advance in a stator core 11 integrally formed by a plurality of teeth 12 having
1, 15U2, 15V2, 15W2 are inserted into the teeth via the slot open 16. The inner periphery of the stator is provided with a rotor 20 facing the inner periphery of the stator core 11 with a small gap. The rotor 20 is rotatably held by bearings or the like (not shown), and a permanent magnet 22 is embedded in a substantially cylindrical rotor core 21. The permanent magnet 22 is magnetized alternately with N and S.
A current commutated by a semiconductor element or the like flows through the coil 15 according to the position of the rotor, a rotating magnetic field is generated in the stator 10, and a torque generated by interaction with the magnetic flux of the rotor 20 acts. Rotate 20.

Next, the manufacturing process will be described.

The stator core 11 is formed by punching a magnetic steel sheet into a predetermined shape by a press and laminating the magnetic steel sheet to a predetermined thickness. On the other hand, as shown in FIG. 2A, the coil 15 is formed in advance by winding in an annular shape (in this case, a shape corresponding to the shape of the surface of one tooth 12 facing the rotor 20). The coils are inserted into the teeth 12 respectively corresponding to the coils 15 as shown in FIGS. At this time, at least the coils 15 of the teeth 12 that are not adjacent to each other are inserted at the same time. In FIG. 2, first, 15U2, 15V1,
Insert 15W2, then 15U1, 15V2, 15W1
2 (b) and FIG.
There is no problem even if the step (c) is reversed. At this time, the coil 15 to be inserted this time is stored in a predetermined position in a portion where the coil 15 is not inserted in the slot 50 into which the coil 15 is inserted, and the dummy member 31 is inserted so as not to be loose. Good. Further, the shape of the slot 50 may be substantially elliptical, and the coil 15 can be smoothly inserted into the slot 50 by making it substantially elliptical, so that the winding property can be improved. When inserting the coil 15, it is preferable to simultaneously insert the interphase insulating paper 19 having a substantially U-shaped concave cross section on the coil 15 side. Interphase insulating paper 19
Is a U-shape concave on the side of each coil 15, and in particular, the folded back on the inner diameter side of the stator 10 can also serve as insulation between the slot open 16 of the stator core 11 and the coil 15. In the vicinity of the slot open 16 of the stator core 11, the interphase insulating paper 19 and the slot insulating paper 18 overlap by a certain length or more, so that sufficient insulation is provided. At this time, coil 15
When the cross-sectional area of the insertable portion for inserting the coil is smaller than the cross-sectional area of the dummy member 31, the interference between the interphase insulating papers 19 in the step of inserting the coil 15 is eliminated, so that the stable insertion of the coil 15 becomes possible. The moment is improved. When the dummy member 31 has a tapered shape such that the cross-sectional area increases toward the leading end in the pulling-out direction, the dummy member 31 has a tapered shape, so that the dummy member 31 can be easily pushed out and damage to the coil 15 is reduced. The effect is obtained. When the dummy member 31 has a tapered shape such that the cross-sectional area decreases toward the leading end in the direction in which the dummy member 31 is pulled out, when the dummy member 31 is pulled out of the slot, the dummy member 31 itself inserts the coil 15 inserted first. The effect of shaping in the slot 50 and facilitating insertion of the next coil 15 can be obtained.

Next, when inserting the coil 15 into the slot 50 into which the dummy member 31 has been inserted, as shown in FIG. By extruding the arranged dummy member 31, the space factor and the pressure resistance are improved, and
Since the interphase insulating paper 19 can be easily inserted, the interphase insulating paper 1
9 can be automated. In addition, a special device and process for extruding the dummy member 31 are not required. As a result, the coils 15 of different phases in the same slot 50 come into contact with each other via the two interphase insulating papers 19.

As shown in FIG. 2D, both axial ends (hereinafter, referred to as "coil ends") 17 of the inserted coil 15 are shaped into a predetermined shape. By shaping, it is possible to secure an insulation space distance with equipment provided near the electric motor, and when magnetizing using the stator winding, the coil end 1
7 to reduce deformation and damage. Furthermore, coil end 1
7, the coils 15 of different phases accommodated in the same slot 50, for example, 15W2 and 15W
A force acts on U1, and the teeth 12 are restrained, so that the rigidity of the stator core 11 is improved.

The shaped coil end 17 may be bound with a binding thread, or the coil 15 may be fused after shaping using a self-fusing electric wire.

An example of the procedure for inserting the coil 15 will be described below.

In the case of 4 poles and 6 slots, the windings applied to the teeth 12 are sequentially U1, V1, W1, U2, V2, W
When the number is 2, for example, U1, W1, and V2 may be inserted at the same time, and then V1, U2, and W2 may be inserted at the same time. At this time, when U1, W1, and V2 are first inserted, they are in the same slot 50 as these, and V1, U1, and V2 are inserted for the second time.
2. Insert the dummy member 31 into W2.

Similarly, when there are 6 poles and 9 slots, each tooth 1
2, windings U1, V1, W1, U2, V
2, W2, U3, V3, W3, for example, first U
1, W1, V2 are inserted simultaneously, then U3, W3, V1
At the same time, and finally U2, W2 and V3 at the same time.

Similarly, in the case of 8 poles and 9 slots, the windings applied to the teeth 12 are sequentially U1, V1, W1, and U1, respectively.
2, V2, W2, U3, V3, W3, U4, V4, W4
, For example, first, U1, W1, V2, U3, W3,
V4 at the same time, then V1, U2, W2, V3, U
4, W4 should be inserted at the same time. Such a coil 1
5, the combination (relative positional relationship) of the coils 15 to be inserted at the same time is the same in each coil 15 insertion. The same configuration may be used. Therefore, the equipment can be simplified, and the productivity can be improved.

That is, the insertion of the coil is completed in three odd slots, and two even slots.

As a result, the sum of the inner diameter areas of the coils 15 of each phase becomes the same, so that the effect that the induced voltage of each phase becomes the same is obtained. In addition, since the resistance of the coil 15 of each phase becomes the same, the effect that the current is stabilized is obtained, and the driving is stabilized by these effects, and the unbalance is reduced. For example, in the case of 4 poles and 6 slots, if the inner diameter area of the second inserted coil 15 is slightly larger than that of the first inserted coil 15, V1, U2, and W2 are larger than U1, W1, and V2 coils. Although the induced voltage of the coil is slightly higher, the total induced voltage of each phase of U, V, and W is U1 + V2, V1 + V2, and W1 + W2.

The adjacent teeth 12 have coils 15
Is inserted, for example, in the case of 4 poles and 6 slots, U
It is also possible to insert the coils of 1, V1, W1, U2, V2, W2 at the same time. In this case, since the number of insertions is one, the number of steps can be reduced. However, problems such as collapse of the coil 15 and crossing of the coils 15 of different phases occur, so that the insertion of the coil 15 itself becomes difficult. .
Therefore, as shown in the present invention, it is desirable to simultaneously insert the coils 15 into the teeth 12 that are not adjacent to each other.

Next, a description will be given of the principle of generation of sound from a motor provided with concentrated windings.

Usually, in the stator core of the electric motor as described above, since the mutually attracting or repelling stress acting between the wide portions 14 adjacent to each other increases, the ring vibration is easily generated, and compared with the distributed winding. The vibration tended to increase. For this, not only the vibration in the rotational direction but also the vibration in the radial direction have a great effect. Slot open 1
In the electric motor manufactured by the nozzle winding method of directly winding the teeth 12 while inserting the winding nozzle from 6, the coil 15 is in close contact with the teeth 12, and between the coils 15 wound on the adjacent teeth 12. Because there is space,
For the ring vibration, the coil 15 does not contribute to the improvement of rigidity other than acting as a mass.

In particular, when PWM control is performed,
In a 120 ° rectangular wave energization in which only two of the phases are energized, the increase in vibration is remarkable. This is because the current flowing through the winding contains more harmonics as compared with the sine wave drive. Also 12
In the 0 ° rectangular wave energization, since the change of the current at the time of the phase switching is steep, a strong exciting force is generated in the wide portion 14 and the vibration increases. Further, in the IPM motor in which the permanent magnet 22 is embedded inside the rotor core 21, the magnetic attraction force is large, so that the force for deforming the stator core 21 is large, and
The unbalance force at the time of the gap also increases. When the permanent magnet 22 is made of a rare earth (Nd-Fe-B system), it becomes more remarkable.

On the other hand, in the electric motor manufactured by the manufacturing method shown in the present invention, if the coils 15 inserted into the same slot 50 are U1 (-) and V1 (+),
U1 (−) and V1 (+) are in contact with each other via the interphase insulating paper 19 inserted at the same time as U1 (−) and the interphase insulating paper 19 inserted at the same time as V1 (+). Thereby, the rigidity of the stator core 11 is improved, and the winding vibration is suppressed. Therefore, the effect of reducing the vibration and noise due to the annular vibration of the stator core 11 generated when the adjacent teeth 12 attract each other is obtained. is there. FIG. 4 shows the transfer function of the stator core of the conventional motor, and FIG. 5 shows the transfer function of the motor of the present invention.

When the stator core 11 is divided and wound as described in the prior art, if the coil is wound without any gap in the slot 50, the elasticity of the coil 15 may be impaired. In the manufacturing method of the present invention, a space factor of 50 to 65% is desirable.

As shown in FIG. 6, by forming the folded corner portions 41 formed on both end surfaces of the teeth 12 of the slot insulating paper 18 in the axial direction into notches, the slot insulating paper 18 is formed after the stator winding is completed. Turned corner portion 41 of stator 1
By not protruding inward from the inner diameter of 0, the insulating paper does not protrude into the inner diameter of the stator 10 and a highly reliable electric motor can be obtained.

As shown in FIG. 7, the shape of the slot 50 of the tooth 12 is increased by a small length L (about 1 to 3 mm) at both ends in the axial direction as compared with the other portions. 12 with a slight width W
Is provided. Teeth 1 of slot insulating paper 18
(2) A part of the folded portion formed on both end surfaces is housed in a step. The width of the step 51 is preferably slightly larger than the thickness of two slot insulating papers 18. For example, 0.25m
When the slot insulating paper 18 of m is used, the width W of the step 51 may be a value larger than 0.5 mm, about 0.6 mm to 1 mm.

When the coil 15 is inserted into the slot 50 or the coil end 17 is formed, the slot insulating paper 1
A large force is applied to the axial end of 8. At this time, when the step 51 is not present, only one of the slot insulating papers 18 is directly pressed against the edge of the axial end of the slot 50 of the tooth 12 with a strong force, and the coil is torn. The insulation between the teeth 15 and the teeth 12 may be broken, but in the configuration having the step 51, the force is absorbed by the folded portion of the slot insulating paper 18, so that the slot insulating paper 18 on the coil 15 side is damaged. Is unlikely to occur. In addition, the axial length H of the folded portion of the slot insulating paper 18 may be a predetermined insulating space distance between the coil end 17 and the teeth 12 even if a part is housed in the step 51. In the case of a compressor or the like used for equipment, the insulation space distance is 2.4 mm or more, and when the axial length of the step is 1 to 3 mm, these are combined to 3.4 to 5.4 mm. It should just be provided.

The material of the slot insulating paper 18 and the interphase insulating paper 19 is preferably a polyester film.
In particular, in applications where the compressor is exposed to a refrigerant as a hermetic compressor, PEN, PET, and the like having a low oligomer are excellent.

If this motor is used in a hermetic compressor, the advantages of downsizing of concentrated winding and reduction of the amount of copper used are not changed, so that high efficiency and low vibration and low noise are obtained. Further, since it is not necessary to use an insulator, it is difficult for the capillary tube to be clogged. Similar effects can be obtained in a hermetic compressor using a natural refrigerant.

The refrigeration cycle equipped with the hermetic compressor has high efficiency, so that the power consumption can be reduced, and the reliability and the life can be improved.

Further, the air conditioner equipped with the refrigeration cycle is highly efficient, so that the power consumption can be reduced, and the reliability and the service life can be improved.

Further, since the refrigerator equipped with the refrigeration cycle is highly efficient, the power consumption can be reduced.
Improved reliability and longer life can be realized.

The electronic circuit cooling system equipped with the refrigeration cycle is highly efficient, so that the power consumption can be reduced, and the reliability and the service life can be improved.

[0064]

As is clear from the above embodiment, according to the first aspect of the present invention, it is easy to obtain an interphase insulating structure, and it is possible to obtain an effect of improving insulation and improving reliability. In addition, it is possible to perform winding without confusing coils of different phases in the same slot. Furthermore, the coil insertability is improved, and a high space factor winding is enabled, and the efficiency of the motor is improved.

According to the second aspect of the present invention, the space factor and the insulation are improved.

According to the third aspect of the present invention, the insulator can be eliminated by improving the insulating property, and the amount of resin used can be reduced. Therefore, the present invention is particularly suitable for use in a hermetic compressor.

According to the fourth aspect of the present invention, when the insulating paper is installed after the coil is inserted, the insulating paper must be installed manually and the insulating paper may be bent. Since the installation is easy, automation by a machine becomes possible.

According to the fifth aspect of the present invention, the coils of different phases in the same slot are divided into left and right coils,
The space factor and pressure resistance are improved. In addition, since the interphase insulating paper can be easily inserted, automation can be performed.

According to the sixth aspect of the present invention, the space factor and the pressure resistance are improved, and the insertion of the interphase insulating paper is facilitated, so that automation becomes possible. In addition, a special device for extruding the dummy member is not required.

According to the seventh aspect of the present invention, since there is no interference between the interphase insulating papers, the coil can be stably inserted, and the space factor can be improved.

According to the eighth aspect of the present invention, since the dummy taper is provided, the dummy member can be easily pushed out, and the effect of reducing coil damage can be obtained.

According to the ninth aspect of the present invention, when the dummy member comes out of the slot, the coil inserted first is shaped in the slot by the dummy member itself, thereby facilitating the next coil insertion. The effect is obtained.

According to the tenth aspect of the present invention, since the sum of the coil inner diameter areas of the respective phases becomes the same, the effect that the induced voltage becomes the same can be obtained. In addition, since the resistance of the coils of each phase becomes the same, the effect of stabilizing the current is obtained, and by these effects, the driving is stabilized and the electric or magnetic imbalance is reduced.

According to the eleventh aspect, since the number of steps is reduced, the productivity is improved.

According to the twelfth aspect of the present invention, the rigidity of the stator core is improved, and there is an effect of suppressing winding vibration. Therefore, annular vibration generated when adjacent teeth attract each other is suppressed. Effective, vibration and noise are reduced.

According to the thirteenth aspect of the present invention, it is possible to obtain a highly reliable electric motor in which the insulating paper does not protrude into the inner diameter of the stator or has little protrusion.

According to the fourteenth aspect of the present invention, a highly reliable electric motor can be obtained without the insulating paper protruding into the inner diameter of the stator.

According to the fifteenth aspect of the present invention, the folded portion of the slot insulating paper hits the edge of the slot of the stator core, so that the insulation is improved. In particular, the effect of eliminating dielectric breakdown due to the stress on the slot insulating paper due to the stress of the winding is obtained.

According to the sixteenth aspect of the present invention, high efficiency, low vibration and low noise can be realized while maintaining the advantages of downsizing of concentrated winding and reduction of the amount of copper used.

According to the seventeenth aspect of the present invention, high efficiency, low vibration and low noise can be obtained, and the use of an insulator is not required.

According to the eighteenth aspect of the present invention, high efficiency, low vibration and low noise can be obtained, and an insulator can be omitted, so that the capillary tube is less likely to be clogged.

According to the nineteenth aspect, the power consumption can be reduced while the efficiency is high, and the improvement of the reliability and the extension of the life can be realized.

According to the twentieth aspect, the power consumption can be reduced while the efficiency is high, and the improvement of the reliability and the long life can be realized.

According to the twenty-first aspect of the present invention, the power consumption can be reduced while the efficiency is high, and the improvement of the reliability and the long life can be realized.

According to the twenty-second aspect of the present invention, especially with the rapid growth of the IT industry in recent years, electronic circuits are concentrated everywhere, such as an Internet host station and a mobile communication relay station. In such a situation, power consumption can be reduced while maintaining high efficiency, and reliability can be improved and life can be extended.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electric motor according to an embodiment of the present invention.

FIGS. 2 (a), (b), (c) and (d) are diagrams showing a method for manufacturing an electric motor according to an embodiment of the present invention.

FIGS. 3A and 3B are diagrams showing a method of inserting a coil into an electric motor according to an embodiment of the present invention.

FIG. 4 is a diagram showing a transfer function of a stator core of a conventional motor.

FIG. 5 is a diagram showing a transfer function of a stator core of an electric motor according to the present invention.

FIG. 6 is a perspective view showing a slot insulating paper shape according to an embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a relationship between a step at both ends in the axial direction of the slot and a folded-back portion of the slot insulating paper in one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Stator 11 Stator iron core 12 Teeth 13 Yoke part 14 Wide part 15 Coil 16 Slot open 17 Coil end 18 Slot insulating paper 19 Interphase insulating paper 20 Rotor 31 Dummy member 41 Folding corner part 50 Slot 51 Step

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 3/18 H02K 3/18 P 5H621 3/34 3/34 ZC 15/10 15/10 21/14 21/14 M (72) Inventor Moruaki Noriaki 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Yamasaki Akihiko 1006 Kazuma Kadoma, Kadoma City Osaka Pref. 72) Inventor Ikugo Seki 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Shinichi Okuyama 1006 Oji Kadoma Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Matsushita Electric Industrial Co., Ltd. (72) Inventor Toshiyuki Tamamura 1006 Kadoma, Kadoma, Kadoma City, Matsushita Electric Industrial Co., Ltd. Tsuyoshi 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Haruhiko Kado 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture AA07 AA08 AE07 5H603 AA01 AA04 AA09 BB01 BB12 CA01 CA05 CB02 CB03 CB24 CB26 CC05 CC11 CC17 CD22 CD33 CE01 FA02 FA04 5H604 AA08 BB01 BB14 CC01 CC05 CC15 CC16 DA16 DB26 PB02 PB03 QH01 PP01 Q01PP01 Q01 PP02 RR02 RR04 SS03 SS05 SS10 TT03 TT05 TT36 5H621 AA04 GA01 GA04 HH01

Claims (22)

[Claims] 1. A stator core formed integrally with a plurality of teeth having a wide portion in a circumferential direction at a tip end and an annular yoke portion, and a slot opening is formed on the teeth after being wound in an annular shape in advance. A coil that is inserted in a concentrated winding form, an interphase insulating paper that insulates between adjacent heterophase coils inserted and housed in a slot formed by the teeth and the yoke, and a coil that is housed in the slot. In a method of manufacturing a motor including a stator having salient pole portions and a rotor having permanent magnets, which is formed of slot insulating paper for insulating a stator core, coils are simultaneously inserted into the teeth not adjacent to each other. A method for manufacturing a motor, wherein the steps are repeated M times (M is an integer of 2 or more) times. 2. A step of inserting a coil wound in an annular shape into the teeth such that the inner diameter width of the coil is larger than the wide teeth portion that is widened in the circumferential direction at the tip end of the teeth. 2. The method according to claim 1, wherein after the coil is inserted deeper into the portion, the inner diameter of the coil is reduced and the height of the inner diameter of the coil is increased in accordance with the reduction of the inner diameter. 3. In the step of inserting the coil, the height of the inner diameter of the coil is enlarged in accordance with the reduction of the inner diameter width, so that the height between the axial end of the stator core and the inner diameter of the axial end of the coil is increased. 3. The method according to claim 2, wherein a sufficient insulation space distance is secured. 4. The method according to claim 1, wherein in each coil inserting step, an interphase insulating paper having a substantially U-shaped cross section with a concave shape on the coil side is inserted together with the coil. The manufacturing method of the electric motor according to the paragraph. 5. The coil insertion is performed in a state where a dummy member is disposed in a slot where a coil is stored and a slot where a coil of an adjacent tooth where no coil is inserted is stored. The method for manufacturing a motor according to any one of claims 1 to 5. 6. The method for manufacturing a motor according to claim 5, wherein the dummy member disposed in the slot portion is extruded following the advance of the coil inserted into the teeth. 7. The method for manufacturing an electric motor according to claim 6, wherein a cross-sectional area of an insertable portion into which a coil is inserted is smaller than a cross-sectional area of a dummy member, out of a total cross-sectional area of the slot that can be wound. 8. The method for manufacturing an electric motor according to claim 5, wherein the dummy member has a tapered shape such that a cross-sectional area increases toward a leading end in a pulling-out direction. 9. The method for manufacturing an electric motor according to claim 5, wherein the dummy member has a tapered shape such that a cross-sectional area decreases toward a leading end in a pulling-out direction. 10. The method for manufacturing a motor according to claim 1, wherein the coils are inserted into the slots by the same number of coils of each phase, which are not adjacent to each other, by the same number. 11. The method for manufacturing a motor according to claim 10, wherein a three-phase winding is applied, and M = 2 when the number of slots is even and M = 3 when the number of slots is odd. 12. After inserting coils of different phases inserted in the same slot, both ends in the axial direction of the coil are shaped, and coils of different phases inserted in the same slot are interphase insulating paper. The method for manufacturing an electric motor according to any one of claims 1 to 11, wherein the electric motor is brought into contact with the electric motor. 13. A stator core integrally formed by a plurality of teeth having a wide portion in a circumferential direction at a tip end and an annular yoke portion, and a stator core that is wound in advance after being wound through a slot open. A coil to be inserted, an interphase insulating paper for insulating between adjacent different-phase coils inserted and housed in a slot formed by the teeth and the yoke, and insulating the coil housed in the slot from the stator core. In a motor having a stator having salient pole portions made of slot insulating paper and a rotor having permanent magnets, a folded corner formed on both axial end surfaces of a stator core of the slot insulating paper. An electric motor characterized by having a notched shape. 14. A slot corner formed on both end faces of the stator core of the slot insulating paper in the axial direction is formed in a notch shape, so that after the stator winding is completed, the slot corner of the slot insulating paper is fixed to the stator. 14. The electric motor according to claim 13, wherein the motor does not protrude inward from the inner diameter. 15. A step for accommodating a part of a folded portion formed on both ends of the stator core of the slot insulating paper is provided on both ends of the slot of the stator core. Item 15. The electric motor according to Item 14. 16. The method according to claim 1, wherein:
A hermetic compressor characterized by using the electric motor manufactured by the manufacturing method according to any one of claims 13 to 17, or using the motor according to any one of claims 13 to 15. 17. The hermetic compressor according to claim 16, wherein the refrigerant is HFC. 18. The hermetic compressor according to claim 16, wherein the refrigerant is a natural refrigerant. 19. A refrigeration cycle on which the hermetic compressor according to claim 16 is mounted. 20. An air conditioner equipped with the refrigeration cycle according to claim 19. 21. A refrigerator equipped with the refrigeration cycle according to claim 19. 22. An electronic circuit cooling system equipped with the refrigeration cycle according to claim 19.