Stator of an electric motor and compressor

Abstract

A stator of an electric motor includes a stator core having a ring-shaped core back portion and a plurality of tooth portions extending inward from the core back portion and formed with intervals in a circumferential direction, a plurality of slots being formed by adjacent tooth portions of the plurality of tooth portions, and a winding wound around each phase of the plurality of phases on the tooth portions. The winding includes a first coil group disposed on an outer diameter side of the stator and a second coil group disposed on an inner diameter side of the stator. The first coil group and the second coil group each have a plurality of coils wound in a concentric manner, the plurality of coils being connected in series, and the winding of all the phases is arranged on an upper portion of a shaft extending in a radial direction of the stator at the tooth portions.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a stator of an electric motor and a compressor having the stator of the electric motor. BACKGROUND

[0002] Conventionally, a stator core of a stator of an electric motor is wound with a coil. There are concentrated winding and distributed winding as a winding method of the coil. The distributed winding has a higher winding factor than the concentrated winding, and can more effectively utilize a magnetic flux of a rotor of the electric motor. If an electric motor mounted on a compressor of an air conditioner is taken as an example, in a case where a capacity required for the compressor is large, it is preferable to mount an electric motor having a stator wound with a coil by distributed winding.

[0003] On the other hand, since the coil end is larger in the distributed winding than in the concentrated winding, if an electric motor having a stator wound with a coil by distributed winding is adopted, the copper amount increases. Therefore, there is a case where an increase in material cost and a decrease in efficiency due to an increase in copper loss occur. In order to reduce the coil end, as the distributed winding, wave winding or lap winding can be considered. By winding a coil to a tooth of a stator core by wave winding or lap winding, two coils of the same phase are inserted into the same slot of the stator core, and since the insertion positions of the coils of each phase are dispersed, the overlap of the coils is reduced. As a result, the coil end is reduced, and a stator that is small and has high efficiency can be obtained. For example, a method of lap winding is shown in Patent Literature 1.

[0004] Patent Literature 1: Japanese Patent Application Publication No. 2015-35837

[0005] In a case where lap winding is performed on a stator, a winding unit in which a wire is wound in a spiral shape is inserted into a slot of a stator core portion. At this time, two coils inserted into the same slot must be arranged with regularity in such a manner that one becomes the stator outer diameter side and the other becomes the stator inner diameter side. Therefore, when a coil is fitted to a coil insertion jig, the position of the coil needs to be appropriately corrected. This position correction must be performed manually by a worker, or by a high-priced winding device provided with a complex correction mechanism.

[0006] Unlike the overlapping winding, consider using the concentric winding coil, inserting two coil groups in the same slot, and arranging the coils in the same slot on the outer diameter side and the inner diameter side of the stator, respectively. However, in this case, the inductance values of the coil arranged on the outer diameter side of the stator and the coil arranged on the inner diameter side of the stator are different, and if these coils are connected in parallel to become a coil group, the current values flowing in each coil group can be imbalanced. As a result, there is a problem that the motor efficiency becomes poor due to an increase in copper loss. On the other hand, consider arranging two coil groups uniformly in the circumferential direction in the slot, but in this case, the width of the slot needs to be expanded in the circumferential direction, thereby making the stator large and the motor as a whole large. As a result, in order to achieve the motor size required when mounted on a compressor, sometimes an insufficient tooth width cannot be obtained. SUMMARY

[0007] The present disclosure was completed in view of the above-described problems, and provides a stator of an electric motor that is small and advantageous in manufacturing, and has good electric efficiency, and a compressor having such a stator of an electric motor.

[0008] The stator of the electric motor of the present disclosure includes a stator core having a ring-shaped core back portion and a plurality of tooth portions extending inward from the core back portion and formed with a gap in the circumferential direction, a plurality of slots being formed by adjacent tooth portions of the plurality of tooth portions, and a winding wound on the tooth portions for each phase of a plurality of phases, the winding being configured by a first coil group arranged on the outer diameter side of the stator and a second coil group arranged on the inner diameter side of the stator, the first coil group and the second coil group each having a plurality of coils wound in a concentric winding, the plurality of coils being connected in series, the coils of the first coil group and the coils of the second coil group being inserted into the same slot and being arranged on the outer diameter side and the inner diameter side, respectively, the winding of all phases of the plurality of phases being arranged on the upper portion of the shaft extending in the radial direction of the stator at the tooth portion, and in a case where the number of poles of the stator is defined as P and the number of slots is defined as S, the relationship S = 3P is satisfied.

[0009] According to the present disclosure, since the first coil group is arranged on the outer diameter side of the stator and the second coil group is arranged on the inner diameter side of the stator, a stator of a motor that ensures sufficient tooth width and suppresses a large size can be obtained. In addition, since the coils of the first coil group and the second coil group are connected in series, imbalance in current values flowing in each coil group is suppressed. Therefore, a decrease in motor efficiency caused by electrical characteristics is suppressed. In addition, since the plurality of coils of the first coil group and the second coil group are wound in a concentric winding, assembly to the stator core is easy. In addition, the winding of all phases of the plurality of phases is erected on the upper portion of the shaft extending in the radial direction of the stator in the tooth portion, and the winding is uniformly arranged. Therefore, the coil end is suppressed from being locally large, and an effect of reducing the amount of copper used can be obtained. As a result, the manufacturing cost of the stator can be reduced, and the motor efficiency can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a cross-sectional view schematically showing a hermetic compressor provided with a stator of the motor of Embodiment 1 of the present disclosure.

[0011] Figure 2 is a plan view showing the stator of the motor of Embodiment 1 of the present disclosure.

[0012] Figure 3 is a plan view showing the structure of the winding of the stator of the motor of Embodiment 1 of the present disclosure.

[0013] Figure 4 is a view showing the first winding before being inserted into the stator of the motor of Embodiment 1 of the present disclosure.

[0014] Figure 5 is a view showing the second winding before being inserted into the stator of the motor of Embodiment 1 of the present disclosure.

[0015] Figure 6 is a plan view showing a state in which the first winding and the second winding are arranged in the stator in Embodiment 1 of the present disclosure.

[0016] Figure 7 shows an ideal stator winding arrangement of a rotating electric machine portion in an overlap winding method.

[0017] Figure 8 shows a stator winding arrangement of a rotating electric machine portion before position correction in an overlap winding method.

[0018] Figure 9 is a plan view showing the coil arrangement of each phase of the stator of the motor of Embodiment 1 of the present disclosure.

[0019] Figure 10 is an electric circuit diagram of the stator of the motor of Embodiment 1 of the present disclosure.

[0020] Figure 11 is a plan view showing a configuration of windings of a stator of an electric motor of Embodiment 2 of the present disclosure.

[0021] Figure 12 is a view showing a coil of a coil group inserted in front of a stator of an electric motor of Embodiment 3 of the present disclosure.

[0022] Figure 13 is a plan view showing a state in which a first coil group and a second coil group are arranged in a stator in Embodiment 3 of the present disclosure.

[0023] Figure 14 is a plan view showing a configuration of windings of a stator of an electric motor of Embodiment 5 of the present disclosure.

[0024] Figure 15 is a plan view showing a configuration of windings of a stator of an electric motor of Embodiment 5 of the present disclosure. DETAILED DESCRIPTION

[0025] Hereinafter, embodiments of a stator of an electric motor of the present disclosure will be described with reference to the drawings. The present disclosure is not limited to the following embodiments, and various modifications can be made within the scope of the gist of the present disclosure. In addition, the present disclosure includes all combinations of structures capable of being combined among the structures shown in each of the following embodiments. In addition, the stator of the electric motor shown in the drawings represents an example of an apparatus to which the stator of the electric motor of the present disclosure is applied, and the present disclosure is not limited to the stator of the electric motor shown in the drawings as the apparatus to which the stator of the electric motor of the present disclosure is applied. In addition, in the following description, terms indicating directions (for example, "upper", "lower", "right", "left", "front", "rear", and the like) are appropriately used for easy understanding, but they are for description and do not limit the present disclosure. In addition, portions to which the same reference numerals are attached in each drawing are the same or equivalent portions, which is common throughout the specification. In addition, there are cases in which the relative size relationship or shape of each component in each drawing is different from the actual one.

[0026] Embodiment 1.

[0027] Figure 1FIG. 1 is a cross-sectional view schematically showing a hermetic compressor provided with a stator of an electric motor according to Embodiment 1 of the present disclosure. The hermetic compressor 1 has a structure in which a compression mechanism portion 3 is housed in an upper portion inside a hermetic container 2, and a rotary electric machine portion 4 is housed in a lower portion. The compression mechanism portion 3 has a fixed scroll 31, an orbiting scroll 32, a guide frame 33, a flexible frame 34, and a cross roller 35. The rotary electric machine portion 4 has a rotor 40 and a stator 50. The stator 50 is fixed to the hermetic container 2 by shrink fitting or the like. The stator 50 is connected to a terminal 13 mounted to the hermetic container 2 through a stator power supply line 12. The compression mechanism portion 3 and the rotary electric machine portion 4 are connected through a rotating shaft 10 held by the guide frame 33 and a sub frame 11, and power generated by a motor of the rotary electric machine portion 4 is transmitted to the compression mechanism portion 3. Refrigeration machine oil 21 for lubricating each sliding portion of the hermetic compressor 1 is enclosed in the hermetic container 2.

[0028] The fixed scroll 31 in the compression mechanism portion 3 is fixed to the guide frame 33 by bolts, which are not shown. The guide frame 33 is fixed to the hermetic container 2 by welding. The orbiting scroll 32 is held by the flexible frame 34, which is held to the guide frame 33. The cross roller 35 has a claw-shaped portion, which is not shown, engaged with a groove-shaped portion, which is not shown, formed in the guide frame 33 and the orbiting scroll 32. Thus, the orbiting motion of the orbiting scroll 32 relative to the fixed scroll 31 is restricted.

[0029] An exhaust port 36 for discharging refrigerant from the compression mechanism portion 3 is formed in the center of the fixed scroll 31. An intake port 37 for sucking refrigerant into the compression mechanism portion 3 is formed on the outer side of the fixed scroll 31. An exhaust pipe 22 for allowing high-pressure refrigerant exhausted into the hermetic container 2 to flow to a refrigeration circuit is provided to a side surface of the hermetic container 2.

[0030] As described above, the hermetic compressor 1 of Embodiment 1 is a high-pressure shell type scroll compressor. In the compression mechanism portion 3, the fixed scroll 31 having a standing wall shape formed in a disc along an involute spiral and the orbiting scroll 32 having a standing wall shape obtained by rotating the same shape of the fixed scroll 31 by 180 degrees are combined in opposition to each other. Further, the orbiting scroll 32 performs a circular motion by power obtained from the electric starting portion by the eccentric rotating shaft 10. At this time, the claw-shaped portion of the cross roller 35 performs a parallel motion along the groove-shaped portions provided at right angles to each other in the guide frame 33 and the orbiting scroll 32, thereby restricting the orbiting motion of the orbiting scroll 32 relative to the fixed scroll 31.

[0031] The fixed scroll 31 and the swing scroll 32 combined in opposition form compression chambers from the outside of the spiral shape by the contact of the standing walls with each other, and the refrigerant sucked from the suction port 37 is transferred toward the center of the spiral by the circumferential movement of the swing scroll 32 to be compressed, and is discharged from the discharge port 36 provided at the center of the compression mechanism portion 3 to the inside of the sealed container 2. The refrigerant of high pressure discharged to the inside of the sealed container 2 flows to the refrigeration circuit from the discharge pipe.

[0032] Figure 2 is a plan view showing a stator of the motor of Embodiment 1 of the present disclosure. Figure 2 The structure of the stator 50 is schematically shown. The stator 50 has a stator core 51 and a winding 52. The stator core 51 is constituted, for example, by laminating a plurality of electromagnetic steel sheets. The stator core 51 has a core back portion 51A of a circular ring shape, and a plurality of tooth portions 51B extending from the core back portion 51A toward the center of the stator core 51 in the radial direction. The plurality of tooth portions 51B are arranged at a prescribed interval in the circumferential direction of the stator core 51. A slot 51C is formed between adjacent tooth portions 51B among the plurality of tooth portions 51B, and a plurality of slots 51C are formed at the stator core 51. In Embodiment 1, the stator core 51 has 18 tooth portions 51B, and thus 18 slots 51C are formed.

[0033] The winding 52 has an A-phase winding 53, a B-phase winding 54, and a C-phase winding 55, and the winding is wound on the tooth portions 51B for each phase of the multiphase. Figure 2 Different cross-sectional lines are applied to the A-phase winding 53, the B-phase winding 54, and the C-phase winding 55, respectively, in Figure 2 As shown in FIG. 5, six of the A-phase winding 53, the B-phase winding 54, and the C-phase winding 55 are provided in the stator 50, respectively, and the stator 50 has six poles.

[0034] That is, when the number of poles is set to P and the number of slots is set to S, the stator 50 satisfies the relationship of S = 3P.

[0035] Figure 3 is a plan view showing the structure of the winding of the stator of the motor of Embodiment 1 of the present disclosure. In Figure 3In order to avoid complication of the drawing, only the A-phase winding 53 is shown. The A-phase winding 53 is a concentric winding having an A-phase first coil group 53A and an A-phase second coil group 53B. The A-phase first coil group 53A has an A-phase first coil 531, an A-phase second coil 532, and an A-phase third coil 533. The A-phase second coil group 53B has an A-phase fourth coil 534, an A-phase fifth coil 535, and an A-phase sixth coil 536. That is, the A-phase first coil group 53A and the A-phase second coil group 53B each have a plurality of coils. As will be described later, the A-phase first coil group 53A is located on the outer diameter side of the stator 50, and the A-phase second coil group 53B is located on the inner diameter side of the stator 50. That is, the A-phase first coil group 53A is located closer to the core back 51A than the A-phase second coil group 53B, and the A-phase second coil group 53B is located closer to the center of the stator 50 than the A-phase first coil group 53A.

[0036] In the following description, there are cases where the A-phase first coil 531, the A-phase second coil 532, and the A-phase third coil 533 are collectively referred to as the coils of the A-phase first coil group 53A. Similarly, there are cases where the A-phase fourth coil 534, the A-phase fifth coil 535, and the A-phase sixth coil 536 are collectively referred to as the coils of the A-phase second coil group 53B.

[0037] The A-phase first coil 531, the A-phase second coil 532, and the A-phase third coil 533 of the A-phase first coil group 53A are inserted into the slot 51C at an equal slot pitch in the counterclockwise direction when the stator 50 is viewed from above, starting from the lead extraction position 5 of the A-phase. Figure 3 In the example shown, the A-phase first coil 531, the A-phase second coil 532, and the A-phase third coil 533 are arranged at a 4-slot pitch.

[0038] The A-phase fourth coil 534, the A-phase fifth coil 535, and the A-phase sixth coil 536 of the A-phase second coil group 53B are inserted into the slot 51C at an equal pitch in the clockwise direction when the stator 50 is viewed from above, starting from the lead extraction position 5. Figure 3 In the example shown, the A-phase fourth coil 534, the A-phase fifth coil 535, and the A-phase sixth coil 536 are arranged at a 4-slot pitch.

[0039] That is, the arrangement direction of the coils of the A-phase first coil group 53A and the arrangement direction of the coils of the A-phase second coil group 53B in the circumferential direction of the stator 50 become opposite directions when the stator 50 is viewed from above.

[0040] Within the same slot 51C, the coils of the A-phase first coil group 53A are inserted on the outer diameter side, and the coils of the A-phase second coil group 53B are inserted on the inner diameter side.

[0041] In the example shown, the A-phase first coil 531, the A-phase second coil 532, and the A-phase third coil 533 are arranged at a 4-slot pitch. Figure 3In the figure, the coils of the A-phase first coil group 53A on the outer diameter side are arranged in the counterclockwise direction when viewed from above the stator 50, while the coils of the A-phase second coil group 53B on the inner diameter side are arranged in the clockwise direction when viewed from above the stator 50, but the arrangement is not limited to this. Alternatively, the coils of the A-phase first coil group 53A on the outer diameter side may be arranged in the clockwise direction, while the coils of the A-phase second coil group 53B on the inner diameter side may be arranged in the counterclockwise direction when viewed from above the stator 50. In other words, the circumferential arrangement of the coils of the A-phase first coil group 53A on the outer diameter side and the coils of the A-phase second coil group 53B on the inner diameter side, when viewed from above, can be reversed.

[0042] As will be described later, the B-phase winding 54 and the C-phase winding 55 also have the same structure as the A-phase winding 53 .

[0043] Figure 4 This is a diagram showing the first winding before being inserted into the stator of the electric motor according to the first embodiment of the present disclosure. Figure 5 This is a diagram showing the second winding before being inserted into the stator of the electric motor according to the first embodiment of the present disclosure. Figure 6 : is a plan view showing a state where the first winding and the second winding are arranged on the stator in the first embodiment of the present disclosure. Figures 4-6 The arrangement of coils in the first embodiment will be described.

[0044] exist Figure 4 In FIG. 1 , reference numeral 102 denotes a lead wire at the winding start end of the first winding 101, and reference numeral 103 denotes a lead wire at the winding end end of the first winding 101. The first winding 101 includes a first coil 101A, a second coil 101B, and a third coil 101C. Figure 4 , the winding direction is uniformly indicated by the hollow thick line A. Concentric winding is applied to each of the first winding first coil 101A, the first winding second coil 101B, and the first winding third coil 101C. The first winding first coil 101A, the first winding second coil 101B, and the first winding third coil 101C are wound with the same number of turns. In the following description, the first winding first coil 101A closest to the lead wire 102 at the start of the winding is sometimes referred to as the start coil, and the first winding third coil 101C closest to the lead wire 103 at the end of the winding is sometimes referred to as the end coil.

[0045] exist Figure 5In the figure, reference numeral 112 is a lead wire at the winding start end of the second winding 111, and reference numeral 113 is a lead wire at the winding end end of the second winding 111. The second winding 111 includes a second winding first coil 111A, a second winding second coil 111B, and a second winding third coil 111C. The second winding first coil 111A, the second winding second coil 111B, and the second winding third coil 111C are arranged in a manner similar to the embodiment of the present invention. Figure 5 , the winding direction is uniformly indicated by the hollow thick line B. Concentric windings are applied to the second winding first coil 111A, the second winding second coil 111B, and the second winding third coil 111C. The number of turns of the second winding first coil 111A, the second winding second coil 111B, and the second winding third coil 111C are the same. In the following description, the second winding first coil 111A closest to the lead wire 112 at the beginning of the winding is sometimes referred to as the starting coil, and the second winding third coil 111C closest to the lead wire 113 at the end of the winding is sometimes referred to as the ending coil.

[0046] Furthermore, the first winding first coil 101A, the first winding second coil 101B, and the first winding third coil 101C, and the second winding first coil 111A, the second winding second coil 111B, and the second winding third coil 111C have the same number of turns.

[0047] Figure 4 The thick line A and Figure 5 The thick lines B in FIG. 1 are in opposite directions. That is, the winding directions of the first winding 101 and the second winding 111 are opposite to each other.

[0048] will be as Figure 4 The first winding 101 and the Figure 5 The second winding 111 is wound as shown. Figure 6 As shown, the coils of the first winding 101 and the second winding 111 are arranged alternately in the circumferential direction of the stator core 51. For example, the first coil 101A of the first winding 101 is arranged near the first coil 111A of the second winding 111 and the third coil 111C of the second winding 111 in the circumferential direction of the stator core 51.

[0049] exist Figure 6 In the example shown, first winding first coil 101A, first winding second coil 101B, and first winding third coil 101C of first winding 101 are inserted into slot 51C at equal slot pitch. In the first embodiment, first winding first coil 101A, first winding second coil 101B, and first winding third coil 101C are inserted into slot 51C at a four-slot pitch.

[0050] Further, the first winding 101 is arranged on the outer diameter side of the stator core 51, and the second winding 111 is arranged on the inner diameter side of the stator core 51.

[0051] When the first winding 101 wound as shown in FIG. 1 is fitted to the coil insertion jig, first, the first winding 101 is fitted to the stator core 51 at equal intervals of 4 slot pitches from the start end coil to the terminal coil. Next, the second winding 111 is fitted to the stator core 51 at equal intervals of 4 slot pitches from the start end coil to the terminal coil as shown in FIG. 2. At this time, the second winding 111 is fitted to the inner diameter side of the stator core 51 with respect to the first winding 101. Thus, each coil of the first winding 101 constitutes the A-phase first coil group 53A shown in FIG. 3, and each coil of the second winding 111 constitutes the A-phase second coil group 53B shown in FIG. 4. Figure 4 Figure 5 Figure 3 Figure 3

[0052] On the other hand, in a case where a wave-wound winding is fitted to a stator core, first, a circular ring-shaped coil is formed, and a so-called star-shaped coil in which a convex portion and a concave portion are alternately arranged in the circumferential direction is molded by applying an external force to the circular ring-shaped coil from the outside toward the center in the radial direction. Then, the star-shaped coil is fitted to the stator core. On the other hand, according to the present embodiment 1, a process of molding the circular ring-shaped coil into the star-shaped coil is not required. Further, since an external force is not applied to the coil, damage to the coil is suppressed. That is, according to the present embodiment 1, reduction in processing cost due to simplification of the process of the coil and improvement in reliability of the winding can be obtained compared to a case where a wave-wound winding is fitted to a stator core.

[0053] Figure 7 An ideal stator winding arrangement of a rotating electrical machine portion in an overlap winding method is shown. Figure 8 An stator winding arrangement of a rotating electrical machine portion before position correction in an overlap winding method is shown. In a case where an overlap-wound winding is fitted to a stator core, it is required to arrange a coil as shown in FIG. 5 after the winding is inserted into a slot portion of the stator core. Figure 7 Figure 7 In the overlap-wound coil shown in FIG. 6, the first coil 60A is a start end coil, and the sixth coil 60F is a terminal coil, and the second coil 60B, the third coil 60C, the fourth coil 60D, and the fifth coil 60E are arranged in this order between the first coil 60A and the sixth coil 60F.

[0054] In the overlap-wound coil shown in FIG. 6, the first coil 60A is a start end coil, and the sixth coil 60F is a terminal coil, and the second coil 60B, the third coil 60C, the fourth coil 60D, and the fifth coil 60E are arranged in this order between the first coil 60A and the sixth coil 60F. Figure 7 ​​​​​In the winding arrangement shown, first to sixth coils 60A, 60B, 60C, 60D, 60E, and 60F are arranged at equal intervals in the circumferential direction of the stator core, with slots for inserting two coils. Furthermore, each coil is positioned radially outward relative to the other coils in one of the two slots and radially inward relative to the other coils in the other slot.

[0055] When the coils formed by overlapping winding are assembled in the coil insertion jig, if the components assembled in the coil insertion jig starting from the first coil 60A are inserted directly into the stator core, the arrangement of the coils becomes Figure 8 That is, the positional relationship between the first coil 60A and the second coil 60B, the second coil 60B and the third coil 60C, the third coil 60C and the fourth coil 60D, the fourth coil 60D and the fifth coil 60E, and the fifth coil 60E and the sixth coil 60F can be Figure 7 However, the positional relationship between the first coil 60A as the starting coil and the sixth coil 60F as the ending coil will not be Figure 7 That is, the first coil 60A is located on the outer diameter side whether it is in the slot where it is inserted together with the second coil 60B or in the slot where it is inserted together with the sixth coil 60F. Therefore, the staff must manually correct the positional relationship between the first coil 60A and the sixth coil 60F, as shown in FIG. Figure 7 As shown, the first coil 60A is located on the inner diameter side, and the sixth coil 60F is located on the outer diameter side. As a result, the processing cost increases due to the need for position correction and fixation.

[0056] In contrast, according to the present embodiment 1, Figure 7 as well as Figure 8 Compared to the case where the coil formed by overlapping winding is assembled on the stator core, there is no need for manual position correction by a worker. Therefore, according to the first embodiment, an increase in processing costs can be suppressed.

[0057] Figure 9 This is a plan view showing the arrangement of coils of each phase of the stator of the electric motor according to the first embodiment of the present disclosure. Figure 10 1 is a motor circuit diagram of the stator of the electric motor according to Embodiment 1 of the present disclosure. The B-phase winding 54 and the C-phase winding 55 have the same structure as the above-mentioned A-phase winding 53.

[0058] The B-phase winding 54 is concentrically wound, and has a B-phase first coil group 54A and a B-phase second coil group 54B. The B-phase first coil group 54A has a B-phase first coil 541, a B-phase second coil 542, and a B-phase third coil 543. The B-phase second coil group 54B has a B-phase fourth coil 544, a B-phase fifth coil 545, and a B-phase sixth coil 546. The B-phase first coil group 54A is located on the outer diameter side of the stator 50, and the B-phase second coil group 54B is located on the inner diameter side of the stator 50. That is, the B-phase first coil group 54A is located closer to the core back 51A than the B-phase second coil group 54B, and the B-phase second coil group 54B is located closer to the center of the stator 50 than the B-phase first coil group 54A.

[0059] The B-phase first coil 541, the B-phase second coil 542, and the B-phase third coil 543 of the B-phase first coil group 54A are inserted into the slots 51C at equal slot intervals in the counterclockwise direction when the stator 50 is viewed from above, starting from the winding start position. In the example shown, the B-phase first coil 541, the B-phase second coil 542, and the B-phase third coil 543 are arranged at 4-slot intervals. Figure 9

[0060] The B-phase fourth coil 544, the B-phase fifth coil 545, and the B-phase sixth coil 546 of the B-phase second coil group 54B are inserted into the slots 51C at equal intervals in the clockwise direction when the stator 50 is viewed from above. In the example shown, the B-phase fourth coil 544, the B-phase fifth coil 545, and the B-phase sixth coil 546 are arranged at 4-slot intervals. Figure 9

[0061] That is, the arrangement direction of the coils of the B-phase first coil group 54A and the arrangement direction of the coils of the B-phase second coil group 54B in the circumferential direction of the stator 50 become opposite directions when the stator 50 is viewed from above.

[0062] Within the same slot 51C, the coils of the B-phase first coil group 54A are inserted on the outer diameter side, and the coils of the B-phase second coil group 54B are inserted on the inner diameter side.

[0063] The C-phase winding 55 is concentrically wound, and has a C-phase first coil group 55A and a C-phase second coil group 55B. The C-phase first coil group 55A has a C-phase first coil 551, a C-phase second coil 552, and a C-phase third coil 553. The C-phase second coil group 55B has a C-phase fourth coil 554, a C-phase fifth coil 555, and a C-phase sixth coil 556. The C-phase first coil group 55A is located on the outer diameter side of the stator 50, and the C-phase second coil group 55B is located on the inner diameter side of the stator 50. That is, the C-phase first coil group 55A is located closer to the core back 51A than the C-phase second coil group 55B, and the C-phase second coil group 55B is located closer to the center of the stator 50 than the C-phase first coil group 55A. ​​

[0064] The C-phase first coil 551, C-phase second coil 552 and C-phase third coil 553 of the C-phase first coil group 55A are inserted into the slots 51C at equal slot pitches in the counterclockwise direction when looking down at the stator 50, starting from the winding start position. Figure 9 In the illustrated example, the C-phase first coil 551 , the C-phase second coil 552 , and the C-phase third coil 553 are arranged at a four-slot pitch.

[0065] The C-phase fourth coil 554, the C-phase fifth coil 555, and the C-phase sixth coil 556 of the C-phase second coil group 55B are inserted into the slots 51C at equal intervals in the clockwise direction when the stator 50 is viewed from above. Figure 9 In the example shown, the C-phase fourth coil 554 , the C-phase fifth coil 555 , and the C-phase sixth coil 556 are arranged at a four-slot pitch.

[0066] That is, in a plan view of the stator 50 , the coil arrangement direction of the C-phase first coil group 55A and the coil arrangement direction of the C-phase second coil group 55B in the circumferential direction of the stator 50 are opposite to each other.

[0067] In the same slot 51C, the coils of the C-phase first coil group 55A are inserted on the radially outer side, and the coils of the C-phase second coil group 55B are inserted on the radially inner side.

[0068] like Figure 9 As shown, coils of all phases of the stator 50 are arranged on all teeth 51B. In detail, in each of the plurality of teeth 51B, coils of the A-phase winding 53, the B-phase winding 54, and the C-phase winding 55 are laid on the upper portion of the shaft 56 of the tooth 51B extending in the radial direction of the stator 50 to form coil ends. Figure 9 In order to avoid complication in the figure, shaft 56 is shown only on tooth portion 51B where coil ends are formed by traversing A-phase sixth coil 536 of A-phase second coil group 53B, B-phase second coil 542 of B-phase first coil group 54A, and C-phase second coil 552 of C-phase first coil group 55A. However, the relationship between shaft 56 and coil ends is the same for the other tooth portions 51B.

[0069] The A-phase first coil group 53A and the A-phase second coil group 53B are connected in series during the wiring process. Specifically, the A-phase first coil group winding end 132 and the A-phase second coil group winding start 133 are connected in series. Furthermore, the A-phase first coil group winding start 131 serves as a power supply lead, while the A-phase second coil group winding end 134 serves as a neutral point lead.

[0070] The B-phase first coil group 54A and the B-phase second coil group 54B are connected in the wiring process, and are connected in series. That is, the B-phase first coil group winding end 142 is connected in series with the B-phase second coil group winding start end 143. Also, the B-phase first coil group winding start end 141 becomes a power supply lead, and the B-phase second coil group winding end 144 becomes a neutral point lead.

[0071] The C-phase first coil group 55A and the C-phase second coil group 55B are respectively connected in the wiring process, and are connected in series. That is, the C-phase first coil group winding end 152 is connected in series with the C-phase second coil group winding start end 153. Also, the C-phase first coil group winding start end 151 becomes a power supply lead, and the C-phase second coil group winding end 154 becomes a neutral point lead.

[0072] The A-phase first coil group winding start end 131 as a power supply lead of the A-phase winding 53, the B-phase first coil group winding start end 141 as a power supply lead of the B-phase winding 54, and the C-phase first coil group winding start end 151 as a power supply lead of the C-phase winding 55 are respectively taken out to the outer diameter side of the stator 50. Therefore, when the stator power supply line 12 shown in FIG. 1 is connected to the terminal 13 installed in the hermetic container 2, the A-phase winding 53, the B-phase winding 54, and the C-phase winding 55 are closer to the terminal 13. As a result, it is possible to reduce the manufacturing cost of the hermetic compressor 1. In addition, it is possible to suppress the slackening caused by elongating the stator power supply line 12. As a result, it is possible to suppress the stator power supply line 12 from contacting the hermetic container 2 or the like. Figure 1

[0073] According to the present embodiment 1, in all of the A-phase, the B-phase, and the C-phase, the winding inserted into each slot 51C is divided into a first coil group on the outer diameter side and a second coil group on the inner diameter side. Also, as described above, the coils of all of the phases of the stator 50 are arranged in all of the tooth portions 51B. Therefore, since the windings are uniformly arranged, the coil end is suppressed from locally increasing, and it is possible to obtain the effect of reducing the amount of copper used. As a result, it is possible to reduce the manufacturing cost of the stator and improve the motor efficiency.

[0074] Figure 10 The wiring in FIG. 1 represents an example of the wiring of the stator 50 of the present embodiment 1. As long as it is wiring that can constitute an equivalent electrical circuit to the wiring shown in FIG. 1, it is not limited to the wiring shown in FIG. 1. Figure 10 Figure 10

[0075] In addition, the present embodiment 1 has been described taking the hermetic compressor 1 as a scroll compressor as an example, but is not limited thereto. It can also be applied to rotary compressors and other types of electric motors.

[0076] Embodiment 2.

[0077] Figure 11 ​​​is a plan view showing a configuration of windings of a stator of an electric motor according to Embodiment 2 of the present disclosure. In order to avoid complication of the drawing, Figure 11 Only the A-phase winding 70 of the stator 250 is shown. In Figure 11 Figure 3 The same components as those shown in The A-phase winding 70 has an A-phase first coil group 70A and an A-phase second coil group 70B. The A-phase first coil group 70A is located on the outer diameter side of the stator 250, and the A-phase second coil group 70B is located on the inner diameter side of the stator 250. The winding start end of the A-phase first coil group 70A is denoted by reference numeral 71, and the winding end is denoted by reference numeral 72. The winding start end of the A-phase second coil group 70B is denoted by reference numeral 73, and the winding end is denoted by reference numeral 74.

[0078] The A-phase first coil group 70A has an A-phase first coil 711, an A-phase second coil 712, and an A-phase third coil 713. The A-phase second coil group 70B has an A-phase fourth coil 714, an A-phase fifth coil 715, and an A-phase sixth coil 716.

[0079] In the present Embodiment 2, the winding manner of each coil before the A-phase first coil group 70A and the A-phase second coil group 70B are inserted into the stator 250 is the same as that shown in Figure 4 In the above Embodiment 1, the winding direction of the A-phase first coil group 53A and the winding direction of the A-phase second coil group 53B are opposite, in contrast to which, in the present Embodiment 2, the winding direction of the A-phase first coil group 70A and the winding direction of the A-phase second coil group 70B are the same.

[0080] In the present Embodiment 2, the winding end 72 of the A-phase first coil group 70A and the winding end 74 of the A-phase second coil group 70B are connected in series. Also, the winding start end 71 of the A-phase first coil group 70A becomes a power supply lead, and the winding start end 73 of the A-phase second coil group 70B becomes a neutral point lead. The B-phase winding and the C-phase winding are also configured in the same manner as shown in Figure 11 By this structure, the stator 250 can be wound in the same manner as in Embodiment 1.

[0081] According to the present Embodiment 2, the winding direction of the coils is one direction, and the configuration in the stator 250 is such that each coil of the A-phase first coil group 70A is configured in a counterclockwise direction, and each coil of the A-phase second coil group 70B is configured in a counterclockwise direction. Therefore, the winding process can be simplified, and the winding time can be improved. Also, since the winding direction of the coils is one direction, the misapplication of the windings for the A-phase first coil group 70A and the A-phase second coil group 70B is suppressed.

[0082] In addition, the winding method of the coils of the A-phase first coil group 70A and the A-phase second coil group 70B before being inserted into the stator 250 may be changed to Figure 5 The winding method shown is the same.

[0083] also, Figure 11 The winding in FIG represents an example of the connection of the stator 250 of the present embodiment 2. Figure 11 Equivalent electrical circuit wiring, not limited to Figure 11 Wiring shown.

[0084] Figure 12 This is a diagram showing coils of a coil group before being inserted into the stator of the electric motor according to the third embodiment of the present disclosure. Figure 13 This is a top view showing the arrangement of the windings of the stator of the motor according to the third embodiment of the present disclosure. Figure 13 Only one phase of the winding is shown. Figure 12 In the figure, reference numeral 81 denotes the lead wire at the beginning of the coil winding, and reference numeral 82 denotes the lead wire at the end of the coil winding. Coil assembly 80 includes a first coil 80A, a second coil 80B, a third coil 80C, a fourth coil 80D, a fifth coil 80E, and a sixth coil 80F. First coil 80A is continuous with second coil 80B, second coil 80B is continuous with third coil 80C, third coil 80C is continuous with fourth coil 80D, fourth coil 80D is continuous with fifth coil 80E, and fifth coil 80E is continuous with sixth coil 80F. First coil 80A, second coil 80B, third coil 80C, fourth coil 80D, fifth coil 80E, and sixth coil 80F are wound concentrically.

[0085] Figure 12 The coil shown is Figure 13 As shown, the first coil 80A, second coil 80B, and third coil 80C are arranged on the outer diameter side of the stator 350, forming a first coil group. The fourth coil 80D, fifth coil 80E, and sixth coil 80F are arranged on the inner diameter side of the stator 350, forming a second coil group. The first coil 80A, second coil 80B, and third coil 80C are arranged in a counterclockwise direction when viewed from above. Similarly, the fourth coil 80D, fifth coil 80E, and sixth coil 80F are arranged in a counterclockwise direction when viewed from above.

[0086] In the third embodiment, for the A-phase winding, the B-phase winding, and the C-phase winding, Figure 12 The winding shown is Figure 13 The configuration shown is on stator 350 .

[0087] In the above-described Embodiment 1 and Embodiment 2, the two coil groups divided are connected in series in the wiring process. In contrast, in the present Embodiment 3, the coils constituting the two coil groups are wound at the stage of the winding process. Therefore, it is possible to simplify the wiring process, improve the winding time, and suppress miswiring.

[0088] In addition, in each of the A-phase winding, the B-phase winding, and the C-phase winding, the winding start line 81 becomes the power supply lead, and the winding end line 82 constitutes the neutral point lead. Therefore, it is possible to limit the positions at which the power supply is extracted from the slot 51C of the stator 350 to two positions. As a result, the visibility of the power supply lead and the neutral point lead of the stator 350 before the wiring process is improved.

[0089] Embodiment 4.

[0090] In the above-described Embodiments 1 to 3, each coil of the first coil group arranged on the outer diameter side of the stator 50 and each coil of the second coil group arranged on the inner diameter side of the stator 50 are wound with the same number of turns. In contrast, in Embodiment 4, the number of turns of each coil of the first coil group and the number of turns of each coil of the second coil group are made different to constitute the stator 50. In this case, the same number of windings are respectively inserted into the plurality of slots 51C of the stator 50. For example, when the number of turns of each coil of the first coil group is set to n (n is a natural number), the number of turns of each coil of the second coil group is set to n+1. Also, the number of windings inserted into all of the slots 51C becomes 2n+1. The other structures are the same as in Embodiments 1 to 3, and each coil is connected in series.

[0091] In a case where each coil of the first coil group and each coil of the second coil group are wound on the stator core 51 with the same number of turns n, the total number of turns of the six coils connected in series is 6xn. In this case, the specific value of the number of turns is, for example, 6, 12, or 18. On the other hand, in a case where the number of turns of each coil of the first coil group is set to n and the number of turns of each coil of the second coil group is set to n+1, the total number of turns of the six coils connected in series is 6n+3. In this case, the specific value of the number of turns is, for example, 9, 15, or 21. That is, in the present Embodiment 4, the range of selection of the number of turns of the coils is not limited as compared to a case where the number of turns of each coil of the first coil group and the number of turns of each coil of the second coil group are the same. Therefore, the degree of freedom of design increases with respect to the number of turns of the coils that can be implemented for the stator 50, and it is possible to more appropriately implement the most suitable winding design for the stator 50.

[0092] Further, in the present embodiment 4, as in the embodiments 1 to 3, the first coil group and the second coil group are connected in series. Therefore, all the coils of the same phase are connected in series, and the same number of windings are inserted in each slot 51C of the stator 50. Therefore, even if there is a difference in the number of turns between the first coil group and the second coil group, there is no difference in the magnetic flux potential, and thus no electrical problem occurs, and the stator 50 can be configured.

[0093] Further, the number of turns of each coil of the first coil group can be set to n+1 when the number of turns of each coil of the second coil group is set to n.

[0094] Embodiment 5

[0095] Figure 14 is a plan view showing a configuration of windings of a stator of a motor of the present embodiment 5. In order to avoid complication of the drawing, Figure 14 Only the A-phase winding 53 which is the same as that of the embodiment 1 is shown. In Figure 14 , the same components as those shown in Figure 9 are denoted by the same reference numerals. As described above, the A-phase first coil group winding end 132 and the A-phase second coil group winding start 133 are connected in series. Further, the A-phase first coil group winding start 131 is a power supply lead, and the A-phase second coil group winding end 134 is a neutral point lead. As shown in Figure 14 , in the present embodiment 5, the A-phase first coil group 53A and the A-phase second coil group 53B are configured in such a manner that the A-phase first coil 531 connected to the power supply and the A-phase sixth coil 536 connected to the neutral point are opposed across the center of the stator 50. In other words, the A-phase first coil group 53A and the A-phase second coil group 53B are configured in such a manner that the A-phase first coil 531 closest to the power supply and the A-phase sixth coil 536 farthest from the power supply are opposed across the center of the stator 50.

[0096] Figure 15 is a plan view showing a configuration of windings of a stator of a motor of the present embodiment 5. In order to avoid complication of the drawing, Figure 15 Only the A-phase winding 70 which is the same as that of the embodiment 2 is shown. In Figure 15 , the same components as those shown in Figure 11 are denoted by the same reference numerals. As described above, the A-phase first coil group winding end 72 and the A-phase second coil group winding end 74 are connected in series. Further, the A-phase first coil group winding start 71 is a power supply lead, and the A-phase second coil group winding start 73 is a neutral point lead. As shown in Figure 15In the illustrated embodiment 5, the A-phase first coil group 70A and the A-phase second coil group 70B are arranged so that the A-phase first coil 711 connected to the power supply line and the A-phase fourth coil 714 connected to the neutral point are opposite each other across the center of the stator 250. In other words, the A-phase first coil group 70A and the A-phase second coil group 70B are arranged so that the A-phase first coil 711 closest to the power supply and the A-phase fourth coil 714 farthest from the power supply are opposite each other across the center of the stator 350.

[0097] The potential difference with respect to the coil closest to the power supply is highest in the coil farthest from the power supply and connected to the neutral point. According to the embodiment 5, in the embodiment 5, the coil closest to the power supply in the first coil group arranged on the outer diameter side of the stator and the coil farthest from the power supply in the second coil group arranged on the inner diameter side of the stator are opposite each other across the center of the stator. Therefore, the coil with the largest potential difference is prevented from being inserted into the same slot, and the reliability of the stator is improved.

[0098] Reference Signs:

[0099] 1…hermetic compressor; 2…hermetic container; 3…compression mechanism; 4…rotary motor; 5…lead extraction position; 10…rotary shaft; 11…sub-frame; 12…stator power lead; 13…terminal; 21…refrigerant oil; 22…discharge pipe; 31…fixed scroll; 32…oscillating scroll; 33…guide frame; 34…flexible frame; 35…cross roller; 36…discharge port; 37…suction port; 40…rotor; 50…stator; 50A…A-phase first coil set; 50B…A-phase second coil set; 50C…slot; 51…stator core; 51A…core back; 51B…tooth portion; 51C…slot; 52…winding; 53…A-phase winding; 53A…A-phase first coil set; 53B…A-phase second coil set; 54…B-phase winding; 54A…B-phase first coil set; 54B…B-phase second coil set; 55…C-phase winding; 55A…C-phase first coil set; 55B…C-phase second coil set; 56…shaft; 60F…sixth coil; 70…A-phase winding; 70A…A-phase first coil set; 70B…A-phase second coil set; 80…coil set; 80A…first coil; 80B…second coil; 80C…third coil; 80D…fourth coil; 80E…fifth coil; 80F…sixth coil; 101…first winding; 101A…first winding first coil; 101B…first winding second coil; 101C…first winding third coil; 102…lead; 103…lead; 111…second winding; 111A…second winding first coil; 111B…second winding second coil; 111C…second winding third coil; 112…lead; 113…lead; 250…stator; 350…stator; 531…A-phase first coil; 532…A-phase second coil; 533…A-phase third coil; 534…A-phase fourth coil; 535…A-phase fifth coil; 536…A-phase sixth coil; 541…B-phase first coil; 542…B-phase second coil; 543…B-phase third coil; 544…B-phase fourth coil; 545…B-phase fifth coil; 546…B-phase sixth coil; 551…C-phase first coil; 552…C-phase second coil; 553…C-phase third coil; 554…C-phase fourth coil; 555…C-phase fifth coil; 556…C-phase sixth coil; 711…A-phase first coil; 712…A-phase second coil; 713…A-phase third coil; 714…A-phase fourth coil; 715…A-phase fifth coil; 716…A-phase sixth coil; n…number of turns.

Claims

1. A stator of an electric motor, characterized in that: have: a stator core having an annular core back and a plurality of teeth extending inward from the core back and formed at intervals in the circumferential direction, wherein a plurality of slots are formed between adjacent teeth of the plurality of teeth; and a winding wound around the teeth for each of a plurality of phases, The winding is composed of a first coil group arranged on the outer diameter side of the stator and a second coil group arranged on the inner diameter side of the stator. The first coil group and the second coil group each include a plurality of coils wound concentrically. The plurality of coils are connected in series, The coils of the first coil group and the coils of the second coil group of the same phase are inserted into the same slot, and the coils of the first coil group of each phase are inserted at the outer diameter side, and the coils of the second coil group of each phase are inserted at the inner diameter side. The windings of all the multiple phases are mounted on the teeth on an axis extending in the radial direction of the stator. When the number of poles of the stator is defined as P and the number of slots is defined as S, the relationship S=3P is satisfied.

2. The stator of the electric motor according to claim 1, characterized in that The plurality of coils constituting the first coil group are connected in series, The plurality of coils constituting the second coil group are connected in series, The first coil group and the second coil group are connected in series.

3. The stator of the electric motor according to claim 2, characterized in that The winding direction of the plurality of coils of the first coil group is opposite to the winding direction of the plurality of coils of the second coil group.

4. The stator of the electric motor according to claim 3, characterized in that The winding end of the first coil group is connected in series with the winding start end of the second coil group. The winding start end of the first coil group is a power lead, The winding end of the second coil group is a neutral point lead.

5. The stator of the electric motor according to claim 3, characterized in that The winding end of the first coil group is connected in series with the winding end of the second coil group. The winding start end of the first coil group is a power lead, The winding start end of the second coil group is a neutral point lead.

6. The stator of the electric motor according to claim 2, characterized in that The winding direction of the plurality of coils of the first coil group is the same as the winding direction of the plurality of coils of the second coil group. The plurality of coils of the first coil group are continuous with the plurality of coils of the second coil group.

7. The stator of the electric motor according to any one of claims 1 to 6, characterized in that: A power line is connected to the first coil group, and a neutral point is connected to the second coil group.

8. The stator of the electric motor according to any one of claims 1 to 6, characterized in that: The number of turns of the plurality of coils of the first coil group is set to n, and the number of turns of the plurality of coils of the second coil group is set to n+1.

9. The stator of the electric motor according to claim 1, characterized in that The first coil group and the second coil group are arranged such that the coil closest to the power supply among the plurality of coils of the first coil group and the coil farthest from the power supply among the second coil group face each other across the center of the stator.

10. A compressor, characterized in that: have: A rotating electrical machine unit comprising the stator of the electric motor according to any one of claims 1 to 9; a compression mechanism portion driven by the rotary motor portion to compress refrigerant sucked from the outside; and A sealed container accommodates the rotating motor portion and the compression mechanism portion.

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