JP4815686B2 - Manufacturing method of electric motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to an electric motor for a hermetic compressor and a method for manufacturing the same, and relates to a hermetic compressor that reduces the amount of resin material used and hardly clogs capillary tubes and a refrigeration cycle using the same..
[0002]
[Prior art]
  In recent years, electric motors having salient pole parts have been used for hermetic compressors from the viewpoint of small size and high efficiency.
[0003]
  As for an electric motor having a salient pole portion, as disclosed in Japanese Patent Laid-Open No. 7-46782, a coil is formed on a stator core through an insulating member formed of a resin called an insulator. . In general, the coil is formed by a direct winding method in which a coil is directly wound on a tooth by a winding machine having a nozzle portion.
[0004]
  As disclosed in the publication, the motor manufactured in this way has a space in the slot for storing the coil wound around the adjacent teeth, and ensures insulation between adjacent coils. Has been.
[0005]
  However, in the direct winding method using the integrated stator core as described above, a space (as a result, a space for ensuring insulation) is formed in the slot from the viewpoint of securing the nozzle passage space in the slot. However, it is difficult to further improve the space factor, and it has been impossible to realize further small size and high efficiency.
[0006]
  Japanese Patent Application Laid-Open No. 9-191588 discloses a manufacturing method in which a stator iron core is formed in a ring shape after being directly wound in a state where the stator core is expanded substantially linearly. It is possible to obtain a stator having a significantly improved space factor by the manufacturing method. And with the space factor improvement, the insulation of the adjacent coils accommodated in the same slot is needed. As the interphase insulation method, this publication discloses a technical idea in which a slot insulating paper has a bent portion, and when the stator core is formed into a ring shape, the bent portion becomes a protrusion and is arranged between the coils. Yes.
[0007]
[Problems to be solved by the invention]
  However, in the manufacturing method in which the stator core is formed into a ring after direct winding in a state where the stator core is expanded substantially linearly as described above, the yoke portion of the stator that serves as a main magnetic flux path is provided. Since it is cut at the junction, considering the dimensional variation, etc., there will be a plurality of minute gaps in the yoke, which increases the magnetic resistance and also causes iron loss due to short circuit between the laminations at the junction. To increase.
[0008]
  In addition, as in the case of a hermetic compressor, in the case where the laminated layers are fixed by half-cutting Karamase or welding of the outer periphery, it is difficult to ensure the bonding strength at the time of dropping, and the bonding is performed by TIG welding or the like. In such a case, the iron loss increases due to a short circuit between the laminations of the welds. Also, in a hermetic compressor in which the outer periphery of the stator is shrink-fitted into the shell, the inner diameter dimensional accuracy can be ensured only by the outer diameter dimensional accuracy of the stator iron core, and the gap is likely to be the same. There was also a problem in terms of noise. Further, when the joint protrudes into the slot, the slot insulating paper may be damaged.
[0009]
  An object of the present invention is to provide a high space factor winding and to suppress vibration and noise due to a steep change in magnetic flux, and to provide a low vibration and low noise motor and a method for manufacturing the same. And
[0010]
[Means for Solving the Problems]
  In order to solve the above problems, the present invention includes a step of inserting a coil into the teeth that are not adjacent to each other when the coil is inserted into the teeth in a concentrated winding shape through a slot open after being previously annularly wound. Repeat M times. This facilitates coil insertion, which can be automated including insulation, and also improves the space factor. Further, the rigidity of the stator core is improved and the winding vibration is also suppressed, so that vibration and noise due to the ring vibration of the iron core can be reduced.Specifically, it is as follows.
[0011]
  According to the first aspect of the present invention, there is provided a stator core integrally formed by a plurality of teeth having a wide portion in the circumferential direction of the tip end portion and an annular yoke portion, and the teeth after being annularly wound in advance. A coil that is inserted into a concentrated winding by turning the slot open to a gap, an interphase insulating paper that insulates between adjacent different-phase coils inserted and accommodated in a slot formed by the teeth and the yoke, and is accommodated in the slot. In the method of manufacturing an electric motor including a stator having salient poles and a rotor having a permanent magnet, which are made of slot insulating paper that insulates the coil and the stator iron core, the teeth that are not adjacent to each other are simultaneously A method of manufacturing an electric motor, wherein the step of inserting a coil is repeated M (M is an integer of 2 or more) times.RThe interphase insulation structure can be easily obtained, and the effects of improving the insulation and improving the reliability can be obtained. Further, winding of coils of different phases within the same slot is possible without being confused. Furthermore, the insertion property of the coil is improved, a high space factor winding is enabled, and the efficiency of the electric motor is improved.
[0012]
  The invention according to claim 2 is a step of inserting a coil wound in an annular shape so that the inner diameter of the coil is larger than the wide portion of the teeth widened in the circumferential direction of the tip of the teeth. 2. The method of manufacturing an electric motor according to claim 1, wherein the coil inner diameter width is reduced after the coil is inserted deeper than the teeth wide portion, and the coil inner diameter height is increased in accordance with the reduction of the inner diameter width.R, Space factor and insulation are improved.
[0013]
  According to a third aspect of the present invention, in the step of inserting the coil, the inner diameter height of the stator core and the axial end of the coil are increased by enlarging the coil inner diameter height in accordance with the reduction of the inner diameter width. The method for manufacturing an electric motor according to claim 2, wherein a sufficient insulating space distance is secured between the first and second portions.RSince the insulation can be improved, the insulator can be abolished and the amount of resin used can be reduced, so that it is particularly suitable for use in a hermetic compressor.
[0014]
  According to a fourth aspect of the present invention, in each coil insertion step, an interphase insulating paper having a substantially U-shaped cross-section that is concave on the coil side is inserted together with the coil. It is a manufacturing method of the electric motor given in any 1 paragraph.RIn the case of conventional insulation paper installation after coil insertion, it must be installed by hand, and the insulation paper may be folded back. However, the present invention is easy to install interphase insulation paper and can be automated by a machine. become.
[0015]
  According to a fifth aspect of the present invention, a coil is inserted in a state where a dummy member is disposed in a slot in which a coil is housed and a coil of an adjacent tooth into which a coil is not inserted is housed. Claims 1 to Claim characterized4The method for manufacturing an electric motor according to any one ofRBy separating the coils of different phases in the same slot into left and right by using the dummy member, the space factor and the pressure resistance are improved. In addition, since the interphase insulating paper can be easily inserted, the interphase insulating paper inserting process can be automated.
[0016]
  The invention described in claim 6 is a method of manufacturing an electric motor according to claim 5, wherein the dummy member disposed in the slot portion is pushed out following the advance of the coil inserted into the tooth.RFurther, since the space factor and pressure resistance are improved and the interphase insulating paper can be easily inserted, the interphase insulating paper insertion process can be automated. In addition, a special device and process for extruding the dummy member are not necessary.
[0017]
  The invention according to claim 7 is characterized in that 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 among all the cross-sectional areas of the slots that can be wound. Is a manufacturing methodRIn the coil insertion step, interference between the interphase insulating papers is eliminated, so that stable coil insertion is possible and the effect of improving the space factor can be obtained.
[0018]
  The invention according to claim 8 is the method of manufacturing an electric 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 tip in a pulling direction. InRSince the punching taper is provided, the dummy member can be easily pushed out and the coil damage can be reduced.
[0019]
  The invention according to claim 9 is the method of manufacturing an electric 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 tip in a pulling direction. InRWhen the dummy member is extracted from the slot, the effect is obtained that the coil that has been previously inserted by the dummy member itself is shaped in the slot to facilitate the next coil insertion.
[0020]
  According to a tenth aspect of the present invention, in the method for manufacturing an electric motor according to any one of the first to ninth aspects, the coils are inserted into the slots at the same time, with the same number of coils of each phase being not adjacent to each other. InRSince the sum of the coil inner diameter areas of the respective phases becomes the same, the effect that the induced voltages of the respective phases become the same can be obtained. In addition, since the resistance of the coils of each phase is the same, the effect that the current is stabilized is obtained, the driving is stabilized by these effects, and the electrical or magnetic imbalance is reduced.
[0021]
  The invention according to claim 11 is the method of manufacturing an electric motor according to claim 10, wherein 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. InRSince the number of processes is reduced, productivity is improved.
[0022]
  According to the twelfth aspect of the present invention, after inserting coils of different phases inserted into the same slot, both end portions in the axial direction of the coil are shaped, and coils of different phases inserted into the same slot. The method for manufacturing an electric motor according to any one of claims 1 to 11, wherein the contact is made through interphase insulating paper.RThe rigidity of the stator core is improved, and the effect of suppressing the winding vibration is obtained. The effect of suppressing the ring vibration generated by the adjacent teeth attracting each other is obtained, and the vibration and noise are reduced. Further, when the slot open portion is also used as the insulating paper, it is possible to reduce processes and materials used in a state where sufficient insulation is ensured.
[0023]
  Incidentally, a reference example will be described.A stator core integrally formed by a plurality of teeth having a wide portion in the circumferential direction of the tip end portion and an annular yoke portion, and a coil that is wound in advance and inserted into the teeth through a slot open; A phase insulating paper that insulates adjacent different phase coils inserted and housed in a slot formed by the teeth and the yoke, and a slot insulating paper that insulates the coil housed in the slot and the stator core. In the electric motor composed of the stator having the salient poles and the rotor having the permanent magnets, the folded corners formed on both end surfaces in the axial direction of the stator core of the slot insulating paper are notched.TheElectric motorThenSince the protrusion of the insulating paper to the inner diameter of the stator does not protrude, or the protrusion can be reduced to such an extent that the pressure resistance and reliability are not affected, a highly reliable electric motor can be obtained.
[0024]
  In the above reference example,The folded corners formed on both end surfaces in the axial direction of the stator core of the slot insulating paper are notched so that the folded corner of the slot insulating paper is within the inner diameter of the stator after the stator winding is finished. Do not protrude to the circumferential sideTheWith an electric motorIsInsulation paper does not protrude from the stator inner diameter, and a highly reliable electric motor can be obtained.
[0025]
  In the above reference example,A step is provided on both end surfaces of the stator core to accommodate a part of the folded portion formed on both ends of the stator core of the slot insulation paper.TheWith an electric motorIsIn addition, since the slot insulating paper folded portion hits the edge portion of the slot on both end face sides of the stator core, the insulation is good. 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.
[0026]
  An electric motor manufactured by the manufacturing method according to any one of claims 1 to 12,Or according to the above reference exampleA hermetic compressor using an electric motor.IsHigh efficiency, low vibration and low noise can be realized while maintaining the advantages of downsizing concentrated copper and reducing the amount of copper used.
[0027]
  By the way,The refrigerant is HFCOf the above reference exampleWith hermetic compressorIsIn addition to high efficiency, low vibration, and low noise, there is no need to use an insulator, so that the capillary tube is not easily clogged.
[0028]
  By the way,The refrigerant is a natural refrigerantOf the above reference exampleWith hermetic compressorIsIn addition to high efficiency, low vibration, and low noise, there is no need to use an insulator, so that the capillary tube is not easily clogged.
[0029]
  Incidentally, in the above reference example,In a refrigeration cycle with a hermetic compressorIsIt is possible to reduce power consumption while being highly efficient, and to improve reliability and extend the service life.
[0030]
  Incidentally, in the above reference example,Air conditioning equipment equipped with a refrigeration cycleIsIt is possible to reduce power consumption while being highly efficient, and to improve reliability and extend the service life.
[0031]
  Incidentally, in the above reference example,In a refrigerator equipped with a refrigeration cycleIsIt is possible to reduce power consumption while being highly efficient, and to improve reliability and extend the service life.
[0032]
  Incidentally, in the above reference example,Electronic circuit cooling system with refrigeration cycleIsIn particular, due to the rapid growth of the IT industry in recent years, electronic circuits are concentrated everywhere, such as Internet host stations and mobile communication relay stations. Power consumption can be reduced while improving reliability and extending the service life.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described using examples.
[0034]
【Example】
  Examples of the present invention will be described below.
[0035]
  FIG. 1 is a sectional view of an electric motor according to an embodiment of the present invention.
[0036]
  FIG. 2 is a diagram showing a method for manufacturing an electric motor in one embodiment of the present invention.
[0037]
  3A and 3B are views showing a method of inserting a coil of an electric motor according to an embodiment of the present invention, in which FIG. 3A is a view from the axial end surface side of the stator core, and FIG.
[0038]
  The stator 10 has coils 15U1 and 15V1 wound in advance in an annular shape around a stator core 11 formed integrally by a plurality of teeth 12 having a wide portion 14 in the circumferential direction of the tip and an annular yoke portion 13. , 15W1, 15U2, 15V2, and 15W2 are inserted through the slot open 16 into the teeth. The inner periphery of the stator includes a rotor 20 that faces the inner periphery of the stator core 11 with a slight gap. The rotor 20 is rotatably held by a bearing 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 in the coil 15 in accordance with the rotor position, a rotating magnetic field is generated in the stator 10, and torque generated by interaction with the magnetic flux of the rotor 20 acts on the rotor 15. 20 is rotated.
[0039]
  Next, the manufacturing process will be described.
[0040]
  The stator core 11 is formed by punching electromagnetic steel sheets into a predetermined shape with a press and laminating them to a predetermined thickness. On the other hand, as shown in FIG. 2A, a coil 15 is formed by winding in advance in a ring shape (in this case, a shape matching the shape of the surface facing the rotor 20 of one tooth 12). The coils are inserted into the teeth 12 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 simultaneously inserted. FIG. 2 shows a procedure for inserting 15U2, 15V1, and 15W2 first, and then inserting 15U1, 15V2, and 15W1. However, even if the steps of FIGS. 2B and 2C are reversed, FIG. no problem. At this time, in the slot 50 into which the coil 15 is inserted, the coil 15 to be inserted this time is accommodated in a predetermined position in a portion where the coil 15 is not inserted, and the dummy member 31 is inserted so as not to be separated. Good. Moreover, the shape of the slot 50 may be substantially elliptical, and the coil 15 is 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 insert the interphase insulating paper 19 having a substantially U-shaped cross-sectional shape on the coil 15 side at the same time. The interphase insulating paper 19 has a concave U-shape on the side of each coil 15. In particular, the folding back on the inner diameter side of the stator 10 can also serve as an insulation between the slot opening 16 of the stator core 11 and the coil 15. In the vicinity of the slot opening 16 of the stator core 11, the interphase insulating paper 19 and the slot insulating paper 18 overlap each other with a certain length or more, so that the insulation is sufficient. At this time, if the cross-sectional area of the insertable portion into which the coil 15 is inserted is smaller than the cross-sectional area of the dummy member 31 among all the cross-sectional areas of the slots that can be wound, the interphase insulating paper 19 is inserted in the coil 15 insertion process. Therefore, stable coil 15 can be inserted, and the space factor is improved. Further, when the dummy member 31 has a taper shape such that the cross-sectional area increases toward the tip in the pulling direction, the pulling taper is provided, so that the dummy member 31 can be easily pushed and damage to the coil 15 is reduced. The effect is obtained. In addition, when it has a taper shape that the cross-sectional area becomes small toward the front 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 coil 15 previously inserted by the dummy member 31 itself is removed. It is possible to obtain the effect of shaping in the slot 50 and facilitating the insertion of the next coil 15.
[0041]
  Next, when inserting the coil 15 into the slot 50 in which the dummy member 31 is inserted, the dummy disposed in the slot 50 following the advance of the coil 15 inserted into the tooth 12 as shown in FIG. By extruding the member 31, the space factor and the pressure resistance are improved, and the interphase insulating paper 19 can be easily inserted. Therefore, the process of inserting the interphase insulating paper 19 can be automated. In addition, a special device and process for extruding the dummy member 31 are not necessary. 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.
[0042]
  As shown in FIG. 2D, both ends (hereinafter referred to as “coil ends”) 17 of the coil 15 after insertion are shaped into a predetermined shape. By shaping, it is possible to secure an insulation space distance from a device provided in the vicinity of the electric motor, and when the stator winding is used for magnetization, deformation and damage of the coil end 17 are suppressed. Further, by forming the coil end 17, a force is applied to the coils 15 of different phases accommodated in the same slot 50, for example, 15 W 2 and 15 U 1, and the teeth 12 are constrained so that the rigidity of the stator core 11 is increased. Will improve.
[0043]
  The shaped coil end 17 may be bound with a binding thread, or the coil 15 may be fused after shaping using a self-bonding electric wire.
[0044]
  An example of the procedure for inserting the coil 15 will be described below.
[0045]
  In the case of 4 poles and 6 slots, when the windings applied to the teeth 12 are U1, V1, W1, U2, V2, and W2, in order, for example, first, U1, W1, and V2 are inserted simultaneously, and then V1, U2 and W2 may be inserted simultaneously. At this time, when U1, W1, and V2 are inserted for the first time, the dummy member 31 is inserted into V1, U2, and W2 that are in the same slot 50 as these and are inserted for the second time.
[0046]
  Similarly, in the case of 6 poles and 9 slots, when the windings applied to the teeth 12 are U1, V1, W1, U2, V2, W2, U3, V3, W3 in order, for example, first, U1, W1, V2 Insert at the same time, then insert U3, W3, V1 at the same time, and finally insert U2, W2, V3 at the same time.
[0047]
  Similarly, in the case of 8 poles and 9 slots, when the windings applied to the teeth 12 are U1, V1, W1, U2, V2, W2, U3, V3, W3, U4, V4, W4 in order, for example, First, U1, W1, V2, U3, W3, and V4 may be inserted at the same time, and then V1, U2, W2, V3, U4, and W4 may be inserted at the same time. If the coil 15 is inserted in this order, the combination (relative positional relationship) of the coils 15 to be inserted at the same time becomes the same when each coil 15 is inserted. The winding machine may have the same configuration. For this reason, facilities can be simplified and productivity is also improved.
[0048]
  That is, the insertion of the coil is completed in odd slots... Three times and even slots.
[0049]
  As a result, the sum of the inner diameter areas of the coils 15 of the respective phases becomes the same, so that the effect that the induced voltages of the respective phases become the same is obtained. Moreover, 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 coil 15 inserted second time is slightly larger than that of the coil 15 inserted first time, V1, U2, W2 of the coil of U1, W1, V2 The induced voltage is slightly higher in the coil, but the total of U, V, and W phases is U1 + V2, V1 + V2, and W1 + W2, respectively, so that the induced voltages are almost the same in each phase.
[0050]
  In addition, when inserting the coil 15 into the adjacent teeth 12, for example, when there are four poles and six slots, it is also possible to insert coils of U1, V1, W1, U2, V2, and 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 coil 15 into the teeth 12 that are not adjacent to each other.
[0051]
  Next, the principle of sound generation of a motor with concentrated winding will be described.
[0052]
  Usually, in the stator core of the electric motor as described above, since the attractive or repulsive stress acting between the adjacent wide portions 14 increases, annular vibration is likely to occur, and the vibration increases compared to the distributed winding. Tended to be. For this, not only the vibration in the rotation direction but also the vibration in the radial direction has a great influence. Further, in the electric motor manufactured by the nozzle winding method in which the winding is directly applied to the teeth 12 while inserting the winding nozzle from the slot open 16, the coil 15 is in close contact with the teeth 12 and wound around the adjacent teeth 12. Since there is a space between the coils 15, the coil 15 does not contribute to the improvement in rigidity except for acting as a mass against the circular vibration.
[0053]
  In particular, when PWM control is performed, the increase in vibration is significant in the case of 120 ° rectangular wave energization that energizes only two of the three phases. This is because the current flowing through the winding includes more harmonics than the sinusoidal drive. In addition, in the 120 ° rectangular wave energization, since the current change at the time of phase switching is steep, a strong excitation force is generated in the wide portion 14 and the vibration is increased. Further, in the IPM motor in which the permanent magnet 22 is embedded in the rotor core 21, the magnetic attraction force increases, so that the force that deforms the stator core 21 is large, and the unbalanced force that is not coincident with the gap also increases. When the permanent magnet 22 is a rare earth (Nd—Fe—B system), it becomes more prominent.
[0054]
  On the other hand, in the electric motor manufactured by the manufacturing method according to the present invention, if the coils 15 inserted into the same slot 50 are U1 (−) and V1 (+), U1 (−) and V1 (+) are The interphase insulating paper 19 inserted simultaneously with U1 (−) and the interphase insulating paper 19 inserted simultaneously with V1 (+) are in contact with each other. As a result, the rigidity of the stator core 11 is improved, and the winding vibration is suppressed. Therefore, there is an effect of reducing vibration and noise due to the ring vibration of the stator core 11 generated by the adjacent teeth 12 attracting each other. is there. FIG. 4 shows a transfer function of a stator core of a conventional motor, and FIG. 5 shows a transfer function of the motor of the present invention.
[0055]
  When the stator core 11 is divided and wound as described in the prior art, the elasticity of the coil 15 may be impaired if the stator core 11 is wound without gaps. In the manufacturing method in the present invention, a space factor of 50 to 65% is desirable.
[0056]
  As shown in FIG. 6, the folding angle portions 41 formed on both end surfaces in the axial direction of the teeth 12 of the slot insulating paper 18 are notched so that the folding angle of the slot insulating paper 18 after the stator winding is finished. By preventing the portion 41 from projecting to the inner peripheral side from the inner diameter of the stator 10, there is no protrusion of insulating paper to the inner diameter of the stator 10, and a highly reliable electric motor can be obtained.
[0057]
  As shown in FIG. 7, the slot 50 of the tooth 12 has a slight length L (about 1 to 3 mm) at both ends in the axial direction, and the shape of the slot 50 is made slightly larger than the other parts, so that the tooth 12 has a slight length. A step 51 having a wide width W is provided. Part of the folded portion formed on both end surfaces of the tooth 12 of the slot insulating paper 18 is accommodated in the step. The width of the step 51 is preferably slightly larger than the thickness of the two pieces of slot insulating paper 18. For example, when the slot insulating paper 18 of 0.25 mm is used, the width W of the step 51 may be a value larger than 0.5 mm and about 0.6 mm to 1 mm.
[0058]
  When the coil 15 is inserted into the slot 50 or the coil end 17 is formed, a large force is applied to the axial end of the slot insulating paper 18. At this time, when there is no step 51, only one of the slot insulating papers 18 is directly pressed against the edge of the axial end portion of the slot 50 of the tooth 12 with a strong force, and it is torn and coiled. Although there is a possibility that the insulation between the teeth 15 and the teeth 12 may be broken, in the configuration with the step 51 described above, 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. The axial length H of the folded portion of the slot insulating paper 18 is not limited as long as a predetermined insulating space distance exists between the coil end 17 and the tooth 12 even if a part of the folded portion 51 is accommodated. In the case of a compressor or the like used for industrial equipment, the insulation space distance is 2.4 mm or more. Therefore, when the axial length of the step is 1 to 3 mm, these are added together to 3.4 to 5.4 mm. What is necessary is just to provide about.
[0059]
  The material of the slot insulating paper 18 and the interphase insulating paper 19 is preferably a polyester film. In particular, as a hermetic compressor, PEN, PET, etc., which are low in oligomers, are excellent in applications where they are exposed to a refrigerant.
[0060]
  If this electric motor is used in a hermetic compressor, the advantages of downsizing the concentrated winding and reducing the amount of copper used are the same, and the efficiency is high, and the vibration and noise are low. Furthermore, since there is no need to use an insulator, capillary tube clogging is unlikely to occur. The same effect can be obtained in a hermetic compressor using a natural refrigerant.
[0061]
  In addition, since the refrigeration cycle equipped with the hermetic compressor is highly efficient, the power consumption can be reduced, and the reliability can be improved and the life can be extended.
[0062]
  Moreover, since the air-conditioning equipment equipped with the refrigeration cycle is highly efficient, it can reduce power consumption, and can improve reliability and extend the life.
[0063]
  In addition, since the refrigerator equipped with the refrigeration cycle is highly efficient, the power consumption can be reduced, and the reliability can be improved and the life can be extended.
[0064]
  In addition, since the electronic circuit cooling system equipped with the refrigeration cycle is highly efficient, power consumption can be reduced, and reliability can be improved and life can be extended.
[0065]
【The invention's effect】
  ContractAccording to the invention described in claim 1, the interphase insulating structure can be easily obtained, and the effects of improving the insulation and improving the reliability can be obtained. Further, winding of coils of different phases within the same slot is possible without being confused. Furthermore, the insertion property of the coil is improved, a high space factor winding is enabled, and the efficiency of the electric motor is improved.
[0066]
  According to invention of Claim 2, a space factor and insulation are improved.
[0067]
  According to the third aspect of the invention, the insulator can be abolished by improving the insulation, and the amount of resin used can be reduced, so that it is particularly suitable for the use of a hermetic compressor.
[0068]
  According to the invention described in claim 4, when the insulating paper is installed after the coil is inserted, it must be installed by a human hand, and the insulating paper is folded back. Because it is easy, it can be automated by machines.
[0069]
  According to the fifth aspect of the present invention, the space factor and the pressure resistance are improved by dividing the coils of different phases in the same slot into left and right. In addition, since interphase insulating paper can be easily inserted, automation is possible.
[0070]
  According to the sixth aspect of the present invention, the space factor and pressure resistance are improved, and the interphase insulating paper can be easily inserted, so that automation is possible. In addition, a special device for extruding the dummy member becomes unnecessary.
[0071]
  According to the seventh aspect of the present invention, since there is no interference between the interphase insulating papers, stable coil insertion is possible, and the effect of improving the space factor can be obtained.
[0072]
  According to the invention described in claim 8, since the taper is attached, the dummy member can be easily pushed out, and the coil damage can be reduced.
[0073]
  According to the ninth aspect of the present invention, when the dummy member comes out of the slot, the dummy member itself shapes the coil previously inserted in the slot so that the next coil can be easily inserted. It is done.
[0074]
  According to the invention described in claim 10, since the sum of the coil inner diameter areas of the respective phases becomes the same, an effect that the induced voltages become the same can be obtained. In addition, since the resistance of the coils of each phase is the same, the effect that the current is stabilized is obtained, the driving is stabilized by these effects, and the electrical or magnetic imbalance is reduced.
[0075]
  According to the eleventh aspect of the invention, the number of steps is reduced, and thus productivity is improved.
[0076]
  According to the invention described in claim 12, since the rigidity of the stator core is improved and there is an effect of suppressing the winding vibration, there is an effect of suppressing the ring vibration generated by the adjacent teeth attracting each other. Vibration, noise are reduced.
[Brief description of the drawings]
FIG. 1 is a sectional view of an electric motor according to an embodiment of the present invention.
FIGS. 2A, 2B, 2C, and 2D are diagrams showing a method of manufacturing an electric motor in one embodiment of the present invention.
FIGS. 3A and 3B are views showing a method of inserting a coil of an electric motor in one embodiment of the present invention.
FIG. 4 is a diagram showing a transfer function of a stator core of a conventional electric 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]One caseThe perspective view which showed the slot insulation paper shape in
[Fig. 7]One caseSectional drawing which showed the relationship between the axial direction both-ends step of a slot in slot, and a slot insulation paper folding | turning part
[Explanation of symbols]
  10 Stator
  11 Stator core
  12 Teeth
  13 Yoke part
  14 Wide part
  15 coils
  16 slots open
  17 Coil end
  18 slot insulation paper
  19 Interphase insulating paper
  20 Rotor
  31 Dummy
  41 Folding corner
  50 slots
  51 steps

Claims (12)

  A stator core integrally formed by a plurality of teeth having a wide portion in the circumferential direction of the tip end portion and an annular yoke portion, and a concentrated winding shape through a slot open to the teeth after being previously annularly wound A coil inserted into the slot, an interphase insulating paper that insulates between adjacent different-phase coils inserted and housed in a slot formed by the teeth and the yoke, and a coil housed in the slot and the stator core are insulated. In the method of manufacturing an electric motor including a stator having salient pole parts and a rotor having a permanent magnet, which is made of slot insulating paper, the step of simultaneously inserting a coil into the teeth not adjacent to each other is described as M (M Is an integer of 2 or more), and the method is repeated.   In the process of inserting the coil wound in an annular shape so that the inner diameter width of the coil is larger than the wide tooth portion widened in the circumferential direction of the tip of the tooth, the coil is inserted deeper than the wide tooth portion. 2. The method of manufacturing an electric motor according to claim 1, wherein 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 width.   In the step of inserting the coil, sufficient insulation is provided between the axial end portion of the stator core and the inner end portion of the axial end portion of the coil by enlarging the coil inner diameter height in accordance with the reduction of the inner diameter width. The method for manufacturing an electric motor according to claim 2, wherein a clearance is secured.   The electric motor according to any one of claims 1 to 3, wherein in each coil insertion step, an interphase insulating paper having a substantially U-shaped cross section having a concave shape on the coil side is inserted together with the coil. Manufacturing method. The coil insertion is performed in a state in which a dummy member is disposed in a slot in which a coil is accommodated and a slot of an adjacent tooth in which a coil is not inserted is accommodated. 5. A method for manufacturing an electric motor according to any one of 4 above.   6. The method of manufacturing an electric motor according to claim 5, wherein the dummy member disposed in the slot portion is pushed out following the advance of the coil inserted into the tooth.   7. The method of manufacturing an electric motor according to claim 6, wherein, of all the slot cross-sectional areas that can be wound, 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.   The method for manufacturing an electric 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 pulling direction.   The method for manufacturing an electric 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 tip in a pulling direction.   The method for manufacturing an electric motor according to any one of claims 1 to 9, wherein the insertion of the coil into the slot is performed simultaneously with the same number of coils of each phase that are not adjacent to each other.   11. The method of manufacturing an electric motor according to claim 10, wherein three-phase winding is applied, and M = 2 when the number of slots is an even number, and M = 3 when the number of slots is an odd number.   After inserting coils of different phases inserted into the same slot, both ends in the axial direction of the coil are shaped, and coils of different phases inserted into the same slot are brought into contact with each other via interphase insulating paper. The method for manufacturing an electric motor according to any one of claims 1 to 11, wherein:

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