Motor and electric compressor equipped with the same

Abstract

To provide a motor capable of eliminating the need for insulating paper manually inserted into each slot and improving insulation properties.SOLUTION: A motor includes a stator 21 around which coils 23 are wound, and a busbar unit 26 which is attached to the stator 21 and includes busbars molded with resin that electrically connect the coils 23 protruding from each slot 29 of the stator 21 to the three-phase terminals. Interphase insulators 30 which extend into the slots 29 and insulate adjacent coils 23 from each other are integrally formed in the busbar unit 26, and the stator 21 is formed with grooves 61 into which the interphase insulators 30 fit.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a motor having a busbar unit in which busbars that electrically connect coils extending from each slot of a stator to three-phase terminals are molded with resin, and to an electric compressor equipped with the motor. [Background technology]

[0002] Conventionally, a motor for driving a compression element of an electric compressor is composed of a stator and a rotor that rotates inside the stator. The stator is composed of a core made of laminated electromagnetic steel sheets, a number of teeth protruding in the inner diameter direction from the core, and a coil wound around each tooth. However, since the core and the coil need to be insulated, an insulator made of insulating resin is provided at the end of the core, and the insulator and the core form a core unit, and the coil is wound around the insulator to insulate the end of the core from the coil.

[0003] A busbar unit consisting of a resin-molded metal busbar and three-phase terminals (terminals connected to the inverter) is provided at the end of the stator, and the coils coming out of each slot of the stator are electrically connected to the three-phase terminals by the busbars of the busbar unit (see, for example, Patent Document 1).

[0004] In addition, since adjacent coils within a slot also need to be insulated from each other, conventionally insulating paper has been manually inserted between the coils in each slot (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] WO2020 / 013078 publication [Patent Document 2] JP 2008-43020 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the above Patent Document 2, multiple pieces of insulating paper are integrated (into a ring-shaped plate) in order to improve work efficiency, but there is a risk that the insulating paper will move or deform due to external loads such as vibration and come into contact with the coil, so there is a problem that it must be molded in resin, and further improvements were required.

[0007] The present invention has been made to solve the above-mentioned conventional technical problems, and has an object to provide a motor that can eliminate the need for insulating paper that is manually inserted into each slot and also improves insulation properties, and an electric compressor equipped with the motor. [Means for solving the problem]

[0008] In order to solve the above problems, the motor of the present invention comprises a stator on which a coil is wound, and a busbar unit formed by molding a busbar, which is attached to the stator and electrically connects the coils coming out of each slot of the stator to the three-phase terminals, with the busbar unit being integrally formed with interphase insulators that enter the slots and insulate adjacent coils from each other, and the stator is formed with grooves into which the interphase insulators fit.

[0009] The motor of the invention of claim 2 is characterized in that in the above invention, the stator has a core, insulators provided at both axial ends of the core, and a fixed cover attached to one of the insulators, the coil is wound around the core via the insulators, and the busbar unit is attached to the stator on the other insulator side, and the groove is formed in the fixed cover.

[0010] The motor of the invention of claim 3 is characterized in that in the above invention, the fixed cover has an engaging portion that engages with an engaged portion formed on one of the insulators and is detachably attached to the insulator.

[0011] The motor of the invention of claim 4 is characterized in that in the invention of claim 2, the busbar unit has an engaging portion that engages with an engaged portion formed on the other insulator and is detachably attached to the insulator.

[0012] The motor of the invention of claim 5 is characterized in that in the invention of claim 1, the stator has a core and insulators provided at both axial ends of the core, the coil is wound around the core via the insulators, and grooves are formed in each insulator.

[0013] The motor of the invention of claim 6 is characterized in that in the above invention, the busbar unit has an engaging portion that engages with an engaged portion formed on the insulator and is detachably attached to the insulator.

[0014] The electric compressor of the invention according to claim 7 comprises the motor and compression element of each of the above inventions housed in a container, and further comprises an inverter to which three-phase terminals are connected.

[0015] The electric compressor of the invention of claim 8 is characterized in that in the above invention, the stator has a core and insulators provided at both axial ends of the core, the coil is wound around the core via the insulators, the inverter is provided in an inverter accommodating section formed in a container in the axial direction of the core, the busbar unit is attached to the stator on the inverter side, and the three-phase terminals are electrically connected to the inverter. Effect of the Invention

[0016] According to the present invention, in a motor equipped with a stator wound with coils and a busbar unit formed by molding a resin busbar attached to the stator and electrically connecting the coils coming out of each slot of the stator to the three-phase terminals, the busbar unit is integrally formed with interphase insulators that enter the slots to insulate adjacent coils from each other, making it possible to eliminate insulating paper that is inserted between adjacent coils in the slots, thereby reducing the number of parts and simplifying the manufacturing process.

[0017] In particular, a groove is formed in the stator into which the interphase insulator fits, thereby making it possible to avoid the inconvenience of the interphase insulator moving or deforming due to external loads such as vibration and coming into contact with the coil, thereby changing the insulation distance.

[0018] According to the invention of claim 2, the stator in the above invention has a core, insulators provided at both axial ends of the core, and a fixed cover attached to one of the insulators, the coil is wound around the core via the insulators, and the busbar unit is attached to the stator on the other insulator side, and a groove is formed in the fixed cover. Therefore, the fixed cover located on the opposite side of the core from the busbar unit can stably hold the free ends of the interphase insulators, effectively preventing movement or deformation of the interphase insulators.

[0019] In this case, if the fixed cover is provided with an engaging portion that engages with the engaged portion formed on one of the insulators as in the invention of claim 3 so that it can be detachably attached to the insulator, assembly of the fixed cover becomes easy.

[0020] Furthermore, as in the invention of claim 4, if the busbar unit is provided with an engaging portion that engages with an engaged portion formed on the other insulator and is removably attached to the insulator, assembly of the busbar unit becomes easier.

[0021] On the other hand, according to the invention of claim 5, the stator in the invention of claim 1 has a core and insulators provided on both ends of the core in the axial direction, and the coil is wound around the core via each insulator, and grooves are formed in each insulator. Therefore, the insulators at both ends of the core stably hold both ends of the interphase insulation, effectively preventing movement or deformation of the interphase insulation.

[0022] In particular, with this configuration, the interphase insulation is fitted into the grooves of the insulators, which lengthens the creepage distance between adjacent coils, thereby significantly improving insulation. Also, there is no need to provide a special member for holding the interphase insulation of the busbar unit, which further reduces the number of parts and simplifies the manufacturing process.

[0023] In this case too, as in the invention of claim 6, if the busbar unit is provided with an engaging portion that engages with the engaged portion formed on the insulator and is removably attached to the insulator, assembly of the busbar unit can be made easier.

[0024] The motor of the above invention is extremely effective when used in an electric compressor such as that of the seventh or eighth invention. [Brief description of the drawings]

[0025] [Figure 1] FIG. 1 is a schematic vertical sectional side view of an electric compressor equipped with a motor according to an embodiment of the present invention (Embodiment 1). [Diagram 2] 2 is a perspective view of a stator and a busbar unit constituting the motor of FIG. 1. [Diagram 3] FIG. 3 is an enlarged view of a portion A in FIG. 2. [Figure 4] FIG. 3 is an enlarged view of the circled portion B in FIG. 2. [Diagram 5] FIG. 3 is a side view of the stator and busbar unit of FIG. 2. [Figure 6] 6 is a cross-sectional view taken along line CC in FIG. 5. [Figure 7] FIG. 7 is an enlarged view of a circle D portion in FIG. [Figure 8] FIG. 3 is a plan view of the stator and busbar unit of FIG. 2. [Figure 9] FIG. 3 is an exploded perspective view of the stator and busbar unit of FIG. 2. [Figure 10] 2 is a perspective view of the other insulator that constitutes the stator of the motor of FIG. 1. [Figure 11] FIG. 11 is an enlarged view of the circled E portion of FIG. [Figure 12] 2 is a perspective view of one of the insulators constituting the stator of the motor of FIG. 1. [Figure 13] FIG. 13 is an enlarged view of the circled portion F in FIG. [Figure 14] 2 is a perspective view of a fixed cover that constitutes a stator of the motor of FIG. 1. [Figure 15] FIG. 15 is an enlarged view of a circle G portion in FIG. [Figure 16] FIG. 19 is an enlarged view of the circle G portion of FIG. [Figure 17] 3 is a vertical sectional side view of the stator and the busbar unit of FIG. 2 and their surroundings. [Figure 18] FIG. 18 is an enlarged view of a circled portion H in FIG. [Figure 19] FIG. 18 is an enlarged view of a portion circled I in FIG. [Figure 20] 2 is a top perspective view of a busbar unit constituting the motor of FIG. 1. [Figure 21] FIG. 21 is an enlarged view of a circle J portion in FIG. 20. [Figure 22] FIG. 21 is a bottom perspective view of the busbar unit of FIG. 20. [Diagram 23] FIG. 23 is an enlarged view of a circle K portion in FIG. 22. [Figure 24] 2 is a perspective view of a bus bar unit and a fixed cover which constitute the motor of FIG. 1. [Diagram 25] FIG. 25 is an enlarged view of a circled portion L in FIG. 24. [Figure 26] FIG. 11 is a side view of a stator and a busbar unit of a motor according to another embodiment of the present invention (Embodiment 2). [Figure 27]27 is a cross-sectional view taken along line MM in FIG. 26. [Figure 28] FIG. 28 is an enlarged view of a portion circled N in FIG. 27. [Figure 29] FIG. 27 is an exploded perspective view of the stator and busbar unit of FIG. 26. [Diagram 30] 27 is a perspective view of each insulator and a busbar unit constituting the stator of FIG. 26. FIG. [Diagram 31] FIG. 31 is an enlarged view of a circled portion P in FIG. 30. [Diagram 32] FIG. 31 is an enlarged view of a circle Q portion in FIG. 30. [Diagram 33] FIG. 27 is a perspective view of the busbar unit of FIG. 26. [Diagram 34] FIG. 27 is a perspective view of the other insulator of FIG. 26. [Diagram 35] FIG. 35 is an enlarged view of a circle R portion in FIG. 34. [Diagram 36] FIG. 27 is a perspective view of one of the insulators in FIG. 26. [Figure 37] FIG. 37 is an enlarged view of the circled portion S in FIG. 36. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. EXAMPLES

[0027] Fig. 1 is a schematic vertical cross-sectional side view of an electric compressor 1 according to an embodiment equipped with a motor 4 of the present invention, Fig. 2 is a perspective view of a stator 21 and a busbar unit 26 of a motor 4 according to an embodiment to which the present invention is applied, Fig. 5 is a side view thereof, Fig. 8 is a plan view thereof, and Fig. 9 is an exploded perspective view thereof. Fig. 6 is a cross-sectional view taken along line CC in Fig. 5, and Figs. 3, 4, and 7 are enlarged views of each part.

[0028] 1, an electric compressor 1 of the embodiment is an inverter-integrated scroll-type electric compressor that houses a scroll compression element 3, which is an example of a compression element, and a motor 4 of the present invention in a container 2. The scroll compression element 3 of the embodiment comprises a fixed scroll 6 fixed to the container 2, and a movable scroll 7 that revolves without rotating relative to the fixed scroll 6 by a rotating shaft 8 of the motor 4, and is arranged so that a spiral wrap 11 formed on the fixed scroll 6 and a spiral wrap 12 formed on the movable scroll 7 mesh with each other.

[0029] The refrigerant is introduced into the container 2 through a refrigerant introduction passage (not shown) and is sucked from the outside into the compression chamber defined between the wraps 11, 12. This compression chamber narrows toward the center due to the orbital motion of the movable scroll 7, so the sucked refrigerant is compressed and discharged from the center through the discharge chamber 14 and a refrigerant discharge passage (not shown). In addition, because the pressure inside the container 2 is low, the refrigerant also passes around the motor 4, cooling the motor 4.

[0030] An inverter accommodating section 17 that accommodates an inverter 16 for driving the motor 4 is formed at the end of the container 2 opposite the scroll compression element 3 (the end in the axial direction of a core 22 described later; the other end of the core 22), as shown in FIG.

[0031] Three-phase terminals 33 of the busbar unit 26, which will be described in detail later, penetrate the bottom wall of this inverter accommodating portion 17, and their tips face the inside of the inverter accommodating portion 17 and are electrically connected to the connection terminals 18 of the inverter 16. The connection terminals 18 and the three-phase terminals 33 are connected by press-fitting, and the motor 4 (three-phase terminals 33) and the inverter 16 are electrically connected, so that power is supplied from the inverter 16 to the motor 4.

[0032] Next, the motor 4 of the present invention will be described. The motor 4 of the embodiment is a permanent magnet synchronous motor, and is composed of a core 22 made of multiple laminated electromagnetic steel sheets, insulators 25, 27 provided at both axial ends of the core 22, a thin-diameter coil 23 (winding), a stator 21 made of a fixed cover 20, the busbar unit 26 mentioned above, and a magnet-embedded rotor 24 (also made of multiple laminated electromagnetic steel sheets) fixed to the rotating shaft 8 and rotating inside the stator 21.

[0033] As shown in FIG. 2, the core 22 of the stator 21 has multiple teeth 28 (the number of teeth corresponds to the number of poles; in this embodiment, 12 teeth), and the slots 29 between each tooth 28 are open toward the center.

[0034] 2 shows the stator 21 and the busbar unit 26 upside down compared to Fig. 1. One insulator 25 is attached to the end of the core 22 on the scroll compression element 3 side (one end of the core 22), and the other insulator 27 is attached to the end of the core 22 on the inverter accommodating section 17 side (the other end of the core 22).

[0035] In each drawing, reference numeral 30 denotes an interphase insulator integrally formed with the busbar unit 26, which is inserted between adjacent coils 23 of different phases in each slot 29 to insulate the adjacent coils 23 from each other. The structure of the busbar unit 26 will be described in detail later.

[0036] As a result, the insulators 25, 27 are fixed to the core 22, the insulators 25, 27 are positioned between the core 22 and the coil 23, and the interphase insulator 30 is positioned between adjacent coils 23 in the slot 29, thereby insulating them from each other. In this embodiment, the insulators 25, 27 are formed into annular shapes by injection molding of insulating synthetic resin such as LCP, PPS, or PBT, and resin 37 including the interphase insulator 30 of the busbar unit 26, which will be described later, is also molded from a similar insulating synthetic resin such as LCP, PPS, or PBT.

[0037] In this case, grooves 56 are formed on the outer surface of the other insulator 27 at positions corresponding to each of the teeth 28, as shown in Figures 10 and 11. Each groove 56 is formed extending in the axial direction of the stator 21, and an engagement hole 57 is formed in each groove 56 as an engaged portion. Also, grooves 58 are formed on the outer surface of one insulator 25 at positions corresponding to each of the teeth 28, as shown in Figures 12 and 13. Each groove 58 is also formed extending in the axial direction of the stator 21, and an engagement hole 59 is formed in each groove 58 as an engaged portion.

[0038] The fixed cover 20 is also made of the same insulating synthetic resin as the insulators 25, 27 and is molded into an annular shape as shown in Fig. 14, with grooves 61 (recessed grooves or slits) formed at positions on the axial extension lines of the centers of the slots 29 (Fig. 16). Also, engagement claws 62 are formed as engagement portions on the outer edge of the fixed cover 20 at positions corresponding to the recessed grooves 56 of the insulator 25 (Fig. 15).

[0039] Then, the engagement claws 62 of the fixed cover 20 are inserted into the respective recessed grooves 58 of the insulator 25 from the axial direction opposite to the core 22 and engage with the engagement holes 59 as shown in Figures 17 and 19, whereby the fixed cover 20 is detachably attached to the insulator 25. In this state, the fixed cover 20 is positioned so that the grooves 61 are located on the axial extension lines of the centers of the respective slots 29 of the core 22.

[0040] Next, a description will be given of the busbar unit 26 fixed to the insulator 27 (the other insulator 27) on the inverter accommodating section 17 side of the stator 21. The busbar unit 26 is a connection member for collecting and electrically connecting the coils 23 protruding from each slot 29 of the core 22 of the stator 21 and the three-phase terminals 33, and is formed by molding a metal (conductive member) busbar 36 (FIG. 1) with resin 37 (the insulating synthetic resin described above) having the shape shown in FIGS. 20 to 23.

[0041] In this embodiment, busbar 36 has an annular shape and is integrally provided with a plurality of welded connections 41 that protrude outside the circle (FIGS. 22 and 23). Twenty-four welded connections 41 are formed corresponding to the number of coils 23 protruding from each slot 29 in the embodiment. In addition, the above-mentioned three-phase terminals 33 stand in a line along the arc of busbar 36, and their bases are electrically connected to busbar 36.

[0042] The busbar 36 and the three-phase terminals 33 are then molded with resin 37 (inserter molding), and the busbar 36, the three-phase terminals 33, and the resin 37 are integrated into the busbar unit 26. In this case, the busbar unit 26 has three terminal holding portions 42, and each of the welded connection portions 41 protrudes in the radial direction of the annular busbar 36 and is exposed from the resin 37. Also, only the base portions of the three three-phase terminals 33 are embedded in the resin 37 at the terminal holding portions 42, protrude in the axial direction of the annular busbar 36, and have their tip portions exposed from the resin 37 as shown in FIG 1 (the three-phase terminals 33 are not shown in FIG 2, FIG 20, etc.).

[0043] Furthermore, the busbar unit 26 is formed with a plurality (12 locations) of engaging portions 43 that protrude outward (in the radial direction) of the circle of the annular busbar 36 by integral molding of resin. In this case, each engaging portion 43 is bent at a right angle in the direction opposite to the three-phase terminal 33, and a claw portion 47 is formed at each tip of each engaging portion 43. The base of each claw portion 47 is formed with a width narrower than the width of the engaging portion 43, and thus the engaging portion 43 at the base of each claw portion 47 is formed with a push-in stopper portion 51 that protrudes outward in the width direction from the claw portion 47.

[0044] Here, it is assumed that the aforementioned grooves 56 of the insulator 27 are formed at positions corresponding to the respective claw portions 47 of the busbar unit 26. In addition, it is assumed that the width dimension of the grooves 56 is the same as the width dimension of the claw portions 47.

[0045] Furthermore, between adjacent engaging portions 43 of the busbar unit 26, the interphase insulators 30 are integrally formed with the resin 37 (FIGS. 20 to 23). Each interphase insulator 30 is formed extending from the busbar unit 26 in the opposite direction to the three-phase terminals 33, and has a sheet-like shape with a substantially T-shaped cross section as shown in FIG.

[0046] When attaching the busbar unit 26 to the insulator 27, the claw portions 47 of each engagement portion 43 of the busbar unit 26 are inserted axially into the recessed grooves 56 of the insulator 27, and the claw portions 47 are engaged with the engagement holes 57. With the claw portions 47 engaged with the engagement holes 57, the push-in stopper portions 51 abut against the end face of the insulator 27, so that the claw portions 47 cannot be pushed in any further, and the amount of pushing into the recessed grooves 56 is determined. In this way, the busbar unit 26 is detachably attached to the insulator 27 and is positioned.

[0047] When attaching the busbar unit 26 to the insulator 27, first, the free ends of the interphase insulators 30 are inserted between the adjacent coils 23 in each slot 29. As a result, each interphase insulator 30 enters each slot 29, and when the claws 47 engage with the engagement holes 57, the tips (free ends) of each interphase insulator 30 fit into the corresponding grooves 61 of the fixed cover 20. Such an assembled state of the busbar unit 26 and the fixed cover 20 is shown in Figures 24 and 25.

[0048] In this state, the T-shaped leg portions (indicated by 30A in FIG. 7 and the like) of each interphase insulator 30 are interposed between adjacent coils 23 in each slot 29 of core 22 without coming into contact with them, as shown in FIG. 7, thereby insulating each coil 23 from one another. In addition, the T-shaped head portion (indicated by 30B in FIG. 7 and the like) of interphase insulator 30 is also held by the surfaces of the tips of two teeth 28 on the slot 29 side, which are expanding as shown in FIG. 7, without coming into contact with coil 23. This prevents the longitudinal middle portion of interphase insulator 30 from moving / deforming inwardly of core 22. The free ends of interphase insulator 30 are held by fixed cover 20 by fitting into groove 61, and are also positioned.

[0049] Furthermore, each insulator 27, 25 is formed with a passing portion 63, 64 through which the coil 23 passes, corresponding to each slot 29, so that the interphase insulator 30 can use these passing portions 63, 64 to allow the insulators 27, 25 to pass through without hindrance (Figures 10 and 12).

[0050] As described above, in the present invention, the interphase insulators 30 that enter the slots 29 to insulate adjacent coils 23 from each other are formed integrally with the busbar unit 26, making it possible to eliminate the conventional insulating paper that is inserted between adjacent coils 23 in the slots 29. This makes it possible to reduce the number of parts and simplify the manufacturing process.

[0051] In particular, a groove 61 into which the interphase insulator 30 fits is formed in the fixed cover 20 of the stator 21, thereby making it possible to avoid the inconvenience of the interphase insulator 30 moving or deforming due to an external load such as vibration and coming into contact with the coil 23, thereby changing the insulation distance.

[0052] In addition, in this embodiment, the stator 21 is composed of a core 22, insulators 25, 27 provided respectively at both axial ends of the core 22, and a fixed cover 20 attached to one of the insulators 25. The coil 23 is wound around the core 22 via the insulators 25, 27, and the busbar unit 26 is attached to the stator 21 on the other insulator 27 side. Grooves 61 are formed in the fixed cover 20. Therefore, the fixed cover 20, which is located on the opposite side of the core 22 from the busbar unit 26, can stably hold the free ends of the interphase insulators 30, effectively preventing movement or deformation of the interphase insulators 30.

[0053] In this case, in the embodiment, the fixed cover 20 is provided with an engaging claw 62 (engaging portion) that engages with an engaging hole 59 (engaged portion) of a groove 58 formed in one of the insulators 25, so that the fixed cover 20 can be removably attached to the insulator 25, making it easy to assemble the fixed cover 20.

[0054] Furthermore, in the embodiment, the busbar unit 26 is provided with claw portions 47 of the engagement portions 43 that engage with engagement holes 57 (engaged portions) of the grooves 56 formed in the other insulator 27, and is removably attached to the insulator 27, which also makes it easy to assemble the busbar unit 26.

[0055] The motor 4 having the above-mentioned configuration is extremely effective when used in the electric compressor 1 as in the embodiment. EXAMPLES

[0056] Next, a motor 4 according to another embodiment of the present invention will be described with reference to Figs. 26 to 37. Fig. 26 is a side view of the stator 21 and busbar unit 26 of this embodiment, Fig. 27 is a cross-sectional view taken along line MM, Fig. 29 is an exploded perspective view of the stator 21 and busbar unit 26, Fig. 33 is a perspective view of the busbar unit 26 of this embodiment, Fig. 34 is a perspective view of the insulator 27 of this embodiment, and Fig. 36 is a perspective view of the insulator 25 of this embodiment. Figs. 28, 31, 32, 35, and 37 are enlarged views of each part. In each drawing, the same reference numerals as those in Figs. 1 to 25 are used to denote the same or similar functions.

[0057] In this embodiment, the fixed cover 20 of the above-mentioned embodiment is not used, and grooves 66, 67 into which the interphase insulators 30 of the busbar unit 26 are fitted are formed in the insulators 27, 25. Therefore, the width of the interphase insulators 30 in this embodiment is slightly enlarged so as to protrude outward compared to that of the above-mentioned embodiment. As shown in Figures 28, 31 and 35, the grooves 66 are formed so as to protrude outward in the passing portions 63 of the insulators 27 at positions on the axial extension lines of the centers of the slots 29 of the core 22. As shown in Figures 32 and 37, the grooves 67 are formed so as to protrude outward in the passing portions 64 of the insulators 25 at positions on the axial extension lines of the centers of the slots 29 of the core 22.

[0058] In this embodiment, when attaching the busbar unit 26 to the insulator 27, as in the previously described embodiment, the claw portions 47 of each engagement portion 43 of the busbar unit 26 are inserted axially into the grooves 56 of the insulator 27 and the claw portions 47 are engaged with the engagement holes 57, thereby removably attaching the busbar unit 26 to the insulator 27.

[0059] At this time, also in this embodiment, the free ends of each interphase insulator 30 are inserted between adjacent coils 23 in each slot 29, and the outer edge of each interphase insulator 30 is fitted into grooves 66, 67 of each insulator 27, 25. The assembled state of busbar unit 26 and insulators 27, 25 in this manner is shown in Figure 30.

[0060] In this state, T-shaped leg portions 30A of each interphase insulator 30 are interposed between adjacent coils 23 in each slot 29 of core 22 without coming into contact with them, as shown in Fig. 28, to insulate each coil 23 from one another. T-shaped head portion 30B of interphase insulator 30 is also held by the surfaces of the tips of two teeth 28 on the slot 29 side as shown in Fig. 28, without coming into contact with coil 23. This prevents the longitudinal middle portion of interphase insulator 30 from moving / deforming inwardly of core 22. The outer edge portion of interphase insulator 30 is held by insulators 27 and 25 through the engagement of grooves 66 and 67, and is also positioned.

[0061] In this way, by forming grooves 66, 67 in each insulator 27, 25, into which the interphase insulator 30 of the busbar unit 26 fits, the insulators 25, 27 at both ends of the core 22 can stably hold both ends of the interphase insulator 30, effectively preventing movement or deformation of the interphase insulator 30.

[0062] In particular, with the configuration of this embodiment, the creepage distance between adjacent coils 23 is increased by the engagement of the interphase insulator 30 with the grooves 66, 67 of the insulators 27, 25, which makes it possible to significantly improve insulation. Also, there is no need to provide a special member such as the aforementioned fixing cover for holding the interphase insulator 30 of the busbar unit 26, which makes it possible to further reduce the number of parts and simplify the manufacturing process.

[0063] In the above embodiments, the grooves 61, 66, 67 into which the interphase insulators 30 of the busbar unit 26 are fitted are formed in the fixed cover 20 or the insulators 27, 25. However, the invention of claim 1 is not limited to this. The grooves may be formed in the core 22 so that the interphase insulators 30 are fitted and held therein.

[0064] Further, in the embodiment, the busbar unit 26 is attached to the insulator 27, but the inventions of claims 1 to 3 are not limited to this. An engaged portion may be formed on the core 22, and the claw portion 47 of the engaging portion 43 of the busbar unit 26 may be engaged with the engaged portion of the core, thereby attaching the busbar unit 26 to the core 22.

[0065] Furthermore, in the embodiment, the present invention is applied to the motor 4 of the electric compressor 1, but the invention is not limited to this in the inventions other than claims 7 and 8, and the present invention is effective for various motors equipped with a busbar unit. [Explanation of symbols]

[0066] 1 Electric compressor 2 containers 3 Scroll compression factor (compression factor) 4 Motor 8 Rotation Axis 16 Inverter 17 Inverter housing 20 Fixed cover 21 Stator 22 cores 23 Coil 24 Rotor 26 Busbar unit 25, 27 Insulator 29 Slots 30 Interphase insulation 33 Three-phase terminal 36 Busbar 37 Resin 41 Welded joint 43 Engagement part 47 Claw 57 Engagement hole (engaged part) 59 Engagement hole (engaged part) 61, 66, 67 groove 62 Engagement claw (engagement part)

Claims

1. A motor includes a stator on which a coil is wound, and a busbar unit formed by molding a busbar with resin, the busbar being attached to the stator and electrically connecting the coil protruding from each slot of the stator to a three-phase terminal, an interphase insulating portion is integrally formed with the busbar unit and extends into the slot to insulate adjacent coils from each other, The motor according to claim 1, wherein the stator is formed with a groove into which the interphase insulator is fitted.

2. The stator has a core, insulators provided at both ends of the core in the axial direction, and a fixed cover attached to one of the insulators, and the coil is wound around the core via the insulators, the busbar unit is attached to the stator on the other insulator side, The motor according to claim 1 , wherein the groove is formed in the fixed cover.

3. 3. The motor according to claim 2, wherein the fixed cover has an engaging portion that engages with an engaged portion formed on one of the insulators, and is detachably attached to the insulator.

4. 3. The motor according to claim 2, wherein the bus bar unit has an engaging portion that engages with an engaged portion formed on the other insulator, and is detachably attached to the other insulator.

5. The stator has a core and insulators provided at both ends of the core in the axial direction, and the coil is wound around the core via the insulators.

2. The motor according to claim 1, wherein the groove is formed in each of the insulators.

6. 6. The motor according to claim 5, wherein the bus bar unit has an engaging portion that engages with an engaged portion formed on the insulator, and is detachably attached to the insulator.

7. 7. An electric compressor comprising: the motor and the compression element according to claim 1 housed in a container; and an inverter to which the three-phase terminals are connected.

8. The stator has a core and insulators provided at both ends of the core in the axial direction, and the coil is wound around the core via the insulators. the inverter is provided in an inverter accommodating portion formed in the container in the axial direction of the core, The electric compressor according to claim 7 , wherein the bus bar unit is attached to the stator on the inverter side, and the three-phase terminals are electrically connected to the inverter.

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