Rotating electrical machines and industrial machinery

Abstract

To provide a rotary electric machine of which the generation of insulation breakdown due to concentration of stress to a part of an insulation film and a bobbin covering a coil is suppressed.SOLUTION: A rotary electric machine comprises: a stator core 21 having a slot 21a; a bobbin 22 fitted into the slot 21a and having a through hole 22c penetrating in an axial direction of the stator core 21; a coil 23 inserted into the through hole 22c; a plurality of projections 22e projecting from at least one of an inner periphery of the through hole 22c and an outer periphery of the coil 23 to guide a position of the coil 23 in the through hole 22c; and resin filled around the coil 23 in the through hole 22c.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a rotating electric machine and an industrial machine. [Background technology]

[0002] Rotating electric machines have been developed that use coils made of rectangular wire with a flat cross section as the conductor to increase the winding space factor of the stator, thereby achieving high power density and compactness. The rotating electric machine in Patent Document 1 has divided coils fitted into through holes in bobbins provided in slots in the stator, achieving further miniaturization, high productivity, and low cost. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020 / 017133 Summary of the Invention [Problem to be solved by the invention]

[0004] In a rotating electric machine, vibrations generated in the stator as the rotor rotates can damage the insulating film covering the coil and the bobbin, potentially resulting in dielectric breakdown. For this reason, rotating electric machines have been developed that cover the coil and the bobbin with a resin such as molding resin or varnish to prevent damage to the insulating film covering the coil and the bobbin. The inventors therefore came up with the idea of ​​covering the coil and the bobbin of the rotating electric machine disclosed in Patent Document 1 with a resin such as molding resin or varnish to prevent damage to the insulating film and the bobbin.

[0005] However, there is nothing inside the bobbin through-hole to support the coil in the radial and circumferential directions of the through-hole, and the coil inserted into the bobbin through-hole may move in the radial and circumferential directions of the through-hole. As a result, the gap between the outer peripheral wall of the coil and the inner peripheral wall of the bobbin may be unevenly formed around the coil. As a result, the molding resin, varnish, or other resin filled between the outer peripheral wall of the coil and the inner peripheral wall of the bobbin may be unevenly formed, which may cause dielectric breakdown due to stress concentration in the insulating film covering the coil or in part of the bobbin.

[0006] An object of the present invention is to provide a rotating electric machine that suppresses the occurrence of dielectric breakdown due to stress concentration on an insulating film covering a coil or on a part of a bobbin. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a stator core having a slot, a bobbin fitted into the slot and having a through hole passing through the axial direction of the stator core, and a rotor having a rotor shaft and a rotor core mounted thereon. to The inserted coil and the through hole Zhou or a plurality of protrusions projecting from the through hole and guiding the position of the coil in the through hole; and a resin filled around the coil in the through hole. In a rotating electric machine, the coils are a set of coils having connection portions within the bobbin and are rectangular wires, the resin is filled around the connection portions in the through holes, the plurality of protrusions are at least four protrusions and are arranged in the through holes so as to face four sides of the set of coils extending in the axial direction of the stator core, the through hole is formed by four or more flat surfaces continuing in its inner circumferential direction, and the plurality of protrusions are provided at corners where two adjacent flat surfaces of the four or more flat surfaces intersect. do. [Effects of the Invention]

[0008] According to the present invention, it is possible to prevent stress concentration in the insulating film covering the coil or in a part of the bobbin, and therefore to prevent dielectric breakdown in the insulating film covering the coil or in the bobbin. Problems, configurations, and effects other than those described above will become clear from the description of the following embodiments. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a cross-sectional perspective view showing a schematic structure of a rotating electric machine according to a first embodiment of the present invention. [Figure 2]1 is a perspective view of a stator of a rotary electric machine according to a first embodiment of the present invention and a rotor disposed within the stator. [Figure 3] 1 is an external perspective view of a stator core according to a first embodiment of the present invention. [Figure 4] 1 is an external perspective view of a bobbin according to a first embodiment of the present invention. [Figure 5] FIG. 1 is a perspective view of a first flat wire and a second flat wire that constitute a pair of coils according to a first embodiment of the present invention before they are inserted into any of a plurality of slots of a stator core. [Figure 6] FIG. 1 is an enlarged perspective view showing the first and second flat wires constituting one coil according to a first embodiment of the present invention before (left side) and after (right side) the tips of the first and second flat wires are connected. [Figure 7] FIG. 5 is an enlarged view of the cross section AA of FIG. [Figure 8] 3 is an enlarged cross-sectional view of a connection portion between a bobbin according to the first embodiment of the present invention and a coil inserted into a through hole. FIG. [Figure 9] FIG. 8 is a schematic diagram of the cross section taken along the line BB in FIG. 7. [Figure 10] 10 is an enlarged cross-sectional view of a connection portion between a bobbin according to another embodiment of the present invention and a coil inserted into a through hole. FIG. [Figure 11] 10 is an enlarged cross-sectional view of a connection portion between a bobbin according to another embodiment of the present invention and a coil inserted into a through hole. FIG. [Figure 12] FIG. 5 is an enlarged cross-sectional view taken along line AA in the case where FIG. 4 is an external perspective view of a bobbin according to a second embodiment of the present invention. [Figure 13] 10 is an enlarged cross-sectional view of a connection portion between a bobbin and a coil inserted into a through hole according to a second embodiment of the present invention. FIG. [Figure 14] FIG. 5 is an enlarged cross-sectional view taken along line AA in the case where FIG. 4 is an external perspective view of a bobbin according to a third embodiment of the present invention. [Figure 15] 10 is an enlarged cross-sectional view of a connection portion between a bobbin and a coil inserted into a through hole according to a third embodiment of the present invention. FIG. [Figure 16] 10 is an enlarged cross-sectional view of a connection portion between a bobbin according to another embodiment of the present invention and a coil inserted into a through hole. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] The configurations and operations of rotating electrical machines according to first to third embodiments of the present invention will be described below with reference to the drawings. In each drawing, the same reference numerals denote the same parts.

[0011] (First embodiment) 1 is a cross-sectional perspective view showing the schematic structure of a rotating electric machine 1 according to a first embodiment of the present invention. The rotating electric machine 1 is, for example, an inner-rotation radial gap type rotating electric machine, and may be used as an electric motor that is the power source for industrial machinery, such as a compressor. The rotating electric machine 1 includes a stator 2, a rotor 3, a shaft 4 that rotates together with the rotor 3, a housing 5 that covers the stator 2, and an end bracket 6 that supports the shaft 4.

[0012] 2 is a perspective view of the stator 2 of the rotating electric machine 1 according to this embodiment and the rotor 3 arranged inside the stator 2. That is, FIG. 2 is a view in which the shaft 4, housing 5, and end bracket 6 are removed from FIG. 1. As shown in FIG. 2, the rotating electric machine 1 includes the cylindrical stator 2 and the columnar rotor 3 arranged inside the stator 2.

[0013] The stator 2 is a component that generates magnetic force using electric power to rotate the rotor 3, and as shown in Fig. 2, has a stator core 21, multiple bobbins 22, and multiple sets of coils 23. The rotor 3 is a component that rotates due to the magnetic force generated by the stator 2, and has a rotor core 31 and multiple permanent magnets 32 fitted into multiple through holes provided in the rotor core 31.

[0014] 3 is an external perspective view of the stator core 21 according to the first embodiment. The stator core 21 is an iron core that forms a magnetic path through which magnetic flux generated by passing electricity through a plurality of sets of coils 23 flows toward the rotor 3. Note that the stator core 21 is preferably formed by, for example, stacking electromagnetic steel plates in order to suppress the generation of eddy currents.

[0015] 3, a plurality of slots 21a are formed in the stator core 21, penetrating the stator core 21 in the axial direction. A bobbin 22 is fitted into each of the plurality of slots 21a, and a plurality of sets of coils 23 are inserted into the bobbin 22.

[0016] Stator core 21 also includes a plurality of teeth 21b that form radial magnetic paths and an annular back yoke 21c that forms a circumferential magnetic path. Note that teeth 21b and back yoke 21c may be separated, and teeth 21b may be formed by stacking trapezoidal thin plates, for example, thin plates made of iron-based amorphous metal.

[0017] Fig. 4 is an external perspective view of the bobbin 22 according to this embodiment. The bobbin 22 is a component that is fitted into the slot 21a and insulates the coil 23 in the bobbin 22 from the stator core 21. As shown in Fig. 4, the bobbin 22 is provided with a cylindrical portion 22a that covers the coil 23, a flange portion 22b that positions the bobbin 22 in the stator core 21, and a through hole 22c into which the coil 23 is inserted.

[0018] The through hole 22c is a hole that penetrates the bobbin 22 fitted in the slot 21a in the axial direction of the stator core 21. In this embodiment, the through hole 22c is surrounded by an inner circumferential surface that follows the inner wall of the slot 21a, and has a shape that is longer in the radial direction than in the circumferential direction of the stator core 21. Note that the through hole 22c is not limited to the above-described shape, and may have other shapes, and multiple through holes 22c may be provided.

[0019] A plurality of sets of coils 23 may be arranged in the through hole 22c in the radial direction of the stator core 21. A partition plate 22d may be provided between two adjacent sets of coils 23 among the plurality of sets of coils 23. Therefore, a plurality of (six in this embodiment) insertion holes 22ca to 22cf are formed in the through hole 22c of this embodiment, and one set of coils 23 is disposed in each of the plurality of insertion holes 22ca to 22cf.

[0020] The material of the bobbin 22 can be, for example, a liquid crystal resin, PPS resin, POE resin, aramid resin, polyimide resin, polyester resin, PE resin, PP resin, or epoxy resin, or two types can be used in combination. Also, fillers such as inorganic fillers, organic fillers, inorganic fibers, or organic fibers can be mixed in. Of these, liquid crystal resins or liquid crystal resins mixed with fillers are particularly preferable in terms of dimensional accuracy, mechanical properties, and thermal properties.

[0021] FIG. 5 is a perspective view of the first and second flat wires 23a and 23b that constitute one coil 23 according to this embodiment before being inserted into any of the slots 21a of the stator core 21. FIG.

[0022] Each coil 23 is formed, for example, by two U-shaped rectangular wires (first rectangular wire 23a and second rectangular wire 23b). The first rectangular wire 23a has a protrusion 23aa at its tip, and the second rectangular wire 23b has a groove 23ba at its tip.

[0023] The first flat wire 23a and the second flat wire 23b are inserted from both ends into insertion holes 22ca to 22cf provided in a through hole 22c provided in a bobbin 22 fitted into each of the plurality of slots 21a of the stator core 21.

[0024] 6 is an enlarged perspective view showing the ends of the first and second flat wires 23a, 23b that make up one set of coils 23 according to this embodiment before (left side) and after (right side) connection. The first and second flat wires 23a, 23b inserted into the respective ends of the insertion holes 22ca to 22cf are connected by fitting the protrusions 23aa into the grooves 23ba within the bobbin 22. By fitting the protrusions 23aa into the grooves 23ba, a connection portion 23c is formed in the set of coils 23, and the first and second flat wires 23a, 23b are electrically connected and physically joined.

[0025] A set of coils 23 is inserted into each of insertion holes 22ca to 22cf provided in through-holes 22c of bobbin 22 fitted into each of the plurality of slots 21a, and connection portions 23c of the plurality of sets of coils 23 are formed inside bobbin 22. As a result, the plurality of sets of coils 23 are wound around stator core 21, as shown in FIG.

[0026] A plurality of protrusions protrude from the inner periphery of through hole 22c or the outer periphery of set of coils 23 to guide the position of set of coils 23 in through hole 22c. The plurality of protrusions preferably includes at least three protrusions to hold set of coils 23. For example, at least three protrusions may protrude from the inner periphery of through hole 22c toward set of coils 23 so that the at least three protrusions abut against the outer periphery of set of coils 23. Alternatively, at least three protrusions may protrude from the outer periphery of set of coils 23 toward the inner periphery of through hole 22c so that the at least three protrusions abut against the inner periphery of through hole 22c. When the at least three protrusions are three protrusions, the three protrusions are preferably arranged so that a triangle with the three protrusions as its vertices forms an acute triangle with the center of gravity of the triangle located within the triangle, in order to fix the position of set of coils 23 in through hole 22c. This is because when the triangle with the three protrusions as vertices is a right-angled triangle or an obtuse-angled triangle, the center of gravity is located on or outside the longest side, and therefore coil 23 can move in the direction of the longest side.

[0027] FIG. 7 is an enlarged view of the AA cross section of FIG. 4. As shown in FIG. 7, protrusions 22e are provided at the four corners of each of the insertion holes 22ca to 22cf. Tips 22ea of ​​the protrusions 22e protrude toward the center of each of the insertion holes 22ca to 22cf. FIG. 8 is an enlarged view of a cross section of the connection between the bobbin 22 according to this embodiment and the coils 23 inserted into the through-holes 22c. As shown in FIG. 8, the protrusions 22e are provided to guide the positions of the sets of coils 23 inserted into the insertion holes 22ca to 22cf provided in the through-holes 22c. Note that, in order to fix the position of each set of coils 23 in the through-holes 22c, it is preferable that each of the four protrusions 22e is arranged so that each of the four pressing forces F that press the set of coils 23 by each of the four protrusions 22e is directed toward one location on the set of coils 23.

[0028] 7, for example, rectangular wires may be used for one set of coils 23, and the plurality of protrusions 22e may be (at least) four protrusions 22e. Each of the four protrusions 22e may be arranged in through-hole 22c so as to face each of four sides 23d of one set of coils 23 extending in the axial direction of stator core 21.

[0029] 7, the through hole 22c may be formed by four or more planes (four planes 22fa-22fd in this embodiment) connected in the inner circumferential direction. The protrusions 22e may be provided at a corner 22g where two adjacent planes intersect among the four or more planes, and at a corner 22h where one of the four or more planes intersects with the partition plate 22d. In this embodiment, the two adjacent planes among the four or more planes 22fa-22fd are planes 22fa and 22fc, planes 22fa and 22fd, planes 22fb and 22fc, and planes 22fb and 22fd. Of the four or more planes 22fa-22fd, the planes that intersect with the partition plate 22d are planes 22fc and 22fd.

[0030] As a result, a gap is formed around the connection portion 23c of the coil 23, as shown in FIG. 8. Resins 24a to 24d are then filled into the gap by, for example, molding, to seal the connection portion 23c of the coil 23. That is, the through-hole 22c is provided with the resin 24 filled around the connection portion 23c. Varnish may also be used for the resin 24. For example, the resin 24 may be a resin material containing a thermoplastic resin, such as an unsaturated polyester resin or an epoxy resin, as a base material, mixed with additives such as an acid anhydride curing agent or an amine curing agent. Two or more types of resin materials may also be used in combination. Fillers such as inorganic fillers, organic fillers, inorganic fibers, and organic fibers may also be mixed. Among these, unsaturated polyester resins, epoxy resins, unsaturated polyester resins, or epoxy resins mixed with fillers, as well as mixed resin materials using these as a base material, are particularly preferable in terms of fluidity, curing characteristics, mechanical properties, and thermal properties. Furthermore, the plurality of protrusions 22e may be provided on the outer periphery of the set of coils 23, instead of on the inner periphery of the through-hole 22c of the bobbin 22.

[0031] Furthermore, if each of insertion holes 22ca to 22cf is a through hole 22c, a plurality of through holes 22ca to 22cf may be formed in bobbin 22 as through holes 22c, and a set of coils 23 may be inserted into each of the plurality of through holes 22ca to 22cf, thereby inserting a plurality of sets of coils 23 into bobbin 22. The plurality of protrusions 22e may protrude from the inner periphery of each of the plurality of through holes 22ca to 22cf or from the outer periphery of each of the plurality of sets of coils 23, and hold each connection portion 23c of each of the plurality of sets of coils 23 at a position away from the inner periphery of each of the plurality of through holes 22c.

[0032] Fig. 9 is a schematic diagram of the cross section BB in Fig. 7. As shown in Fig. 9, the length of each of the multiple protrusions 22e protruding toward the center of the through hole 22c may be such that the length L2 inside the through hole 22c is longer than the length L1 at the openings at both ends of the through hole 22c. That is, the length of the protrusions 22e protruding toward the center of the through hole 22c may be longer from both ends of the through hole 22c toward the interior of the through hole 22c. Also, as shown in Fig. 9, the edge of the opening of the through hole 22c may be chamfered C1.

[0033] Note that this embodiment may be modified as follows. For example, although the embodiment in which four protrusions 22e protrude from the inner periphery of through hole 22c has been described above, it is sufficient if at least three protrusions are provided from the inner periphery of through hole 22c or the outer periphery of set of coils 23. Furthermore, in order to fix the position of set of coils 23 in through hole 22c, it is preferable that each of the at least three protrusions is arranged so that each of at least three pressing forces F that press against set of coils 23 by each of the at least three protrusions is directed toward one location on set of coils 23.

[0034] 10, three protrusions 22e are preferably arranged so that they protrude from the inner periphery of through hole 22c toward the set of coils 23, and each of the three protrusions 22e applies a plurality of pressing forces F to press the set of coils 23 toward one location on the set of coils 23. Also, as shown in FIG. 11, three protrusions 23i are preferably arranged so that they protrude from the outer periphery of the set of coils 23 toward the inner periphery of through hole 22c, and each of the three protrusions 22e applies a plurality of pressing forces F to press the set of coils 23 from the inner periphery of through hole 22c toward one location on the set of coils 23.

[0035] [effect] The rotating electric machine 1 according to this embodiment includes a plurality of protrusions 22e that protrude from at least one of the inner periphery of the through-hole 22c of the bobbin 22 and the outer periphery of the coil 23 and guide the position of the coil 23 in the through-hole 22c of the bobbin 22. The plurality of protrusions 22e function as guides when inserting the coil 23 into the through-hole 22c of the bobbin 22. Therefore, by adjusting the position and size of the plurality of protrusions 22e, the size of the gap formed between the coil 23 and the through-hole 22c can be controlled. For example, by controlling the position and size of the protrusions 22e so that the size of the gap is uniform, the resin 24, such as molding resin or varnish, can be formed substantially uniformly around the coil 23 when the gap is filled with the resin 24. That is, according to this embodiment, the plurality of protrusions 22e create inflow paths for filling the resin 24 around the connection portion 23c of the coil 23 in the through-hole 22c, thereby enhancing the inflow of the resin 24 and enabling the resin 24 to be evenly filled around the connection portion 23c of the coil 23. Therefore, stress concentration on the insulating film covering the coil 23 and on a part of the bobbin 22 can be suppressed, and dielectric breakdown can be suppressed in the insulating film covering the coil 23 and on the bobbin 22.

[0036] Furthermore, in the rotating electric machine 1 according to this embodiment, the coil 23 is preferably a set of coils 23 having a connecting portion 23c inside the bobbin 22, and the resin 24 is preferably filled around the connecting portion 23c in the through hole 22c. This allows the coil end to be made smaller, thereby enabling the rotating electric machine 1 to be made smaller, with higher productivity and lower costs.

[0037] Furthermore, the cooling method for the rotating electric machine 1 includes directly cooling the stator 2 with a refrigerant (for example, lubricating oil for the rotating electric machine 1). In this case, if there is a portion between the outer peripheral wall of the coil 23 and the inner peripheral wall of the bobbin 22 where the resin 24 is absent, the refrigerant may infiltrate from that portion toward the connection portion 23c of the coil 23 inside the bobbin 22. If the refrigerant reaches the connection portion 23c, the connection strength of the connection portion 23c may decrease.

[0038] Therefore, as described above, the plurality of protrusions 22e function as guides when inserting the set of coils 23 into the through holes 22c of the bobbin 22, and by devising the positions and sizes of the plurality of protrusions 22e, it is possible to prevent the formation of areas around the connection portions 23c without the resin 24. Furthermore, since it is possible to prevent the coolant that cools the stator 2 from entering the connection portions 23c of the set of coils 23 inside the bobbin 22, a decrease in the connection strength of the connection portions 23c is prevented, and the electrical conductivity reliability of the coils 23 can be ensured.

[0039] Furthermore, it is preferable that the number of protrusions 22e is at least three. This allows the set of coils 23 to be held at a predetermined position within the through-hole 22c by the at least three protrusions 22e. When the number of protrusions is at least three, it is preferable that the three protrusions are arranged so that a triangle formed by the three protrusions forms an acute triangle. This allows the position of the set of coils 23 in the through-hole 22c to be fixed by the three protrusions. It is also preferable that the at least three protrusions are arranged so that each of the multiple pressing forces F that press the set of coils 23 is directed toward one location on the set of coils 23. This allows the set of coils 23 to be fixed at a predetermined position within the through-hole 22c.

[0040] Furthermore, the set of coils 23 may be rectangular wires, and the plurality of protrusions 22e may be at least four protrusions 22e, each of which may be arranged in the through-hole 22c so as to face one of four sides 23d of the set of coils 23 extending in the axial direction of the stator core 21. This allows the plurality of protrusions 22eg to hold the four corners of the outer periphery of the rectangular wire 23, and a gap serving as an inflow path for the resin 24 is formed between the inner periphery of the through-hole 22c and the side surface of the rectangular wire 23, allowing the resin 24 to be filled around the connection portion 23c in the bobbin 22. This also reduces the contact area between the set of coils 23 and the plurality of protrusions 22e, thereby increasing the area of ​​the resin 24 covering the connection portion 23c, and thus preventing the refrigerant that cools the stator 2 from entering the connection portion 23c of the coils 23 in the bobbin 22.

[0041] Furthermore, multiple sets of coils 23 are arranged in through-hole 22c by arranging multiple sets of coils 23 along the radial direction of stator core 21. A partition plate may be provided between two sets of coils 23 adjacent to each other in the radial direction of stator core 21 among the multiple sets of coils 23. This makes it possible to prevent the multiple sets of coils 23 from coming into contact with each other and short-circuiting. Furthermore, at least four of multiple protrusions 22e are arranged around each of the multiple sets of coils 23. This creates a gap around each connection portion 23c of the multiple sets of coils 23 that serves as an inflow path for resin 24, allowing resin 24 to be filled evenly.

[0042] Furthermore, through hole 22c is formed by four or more planes 22fa to 22fd that are continuous in the inner circumferential direction, and multiple protrusions 22e may be provided at corners where two adjacent planes of the four or more planes 22fa to 22fd intersect. The two adjacent planes in bobbin 22 shown in FIG. 7 are planes 22fa and 22fc, planes 22fa and 22fd, planes 22fb and 22fc, and planes 22fb and 22fd. This allows each of multiple protrusions 22e to be supported by the two adjacent planes, increasing its strength and increasing the force guiding coil 23.

[0043] Furthermore, through hole 22c is configured with four or more flat surfaces 22fa to 22fd that are continuous in the inner circumferential direction, and multiple protrusions 22e can be provided at corners where one of four or more flat surfaces 22fa to 22fd intersects with partition plate 22d. This allows protrusions 22e to strengthen the connection between partition plate 22d and the inner periphery of through hole 22c, thereby increasing the strength of partition plate 22d.

[0044] Furthermore, in the rotating electric machine 1 according to this embodiment, if each of the insertion holes 22ca to 22cf is a through hole 22c, then a plurality of through holes 22ca to 22cf are formed in the bobbin 22 as the through holes 22c, and a set of coils 23 is inserted into each of the plurality of through holes 22ca to 22cf, thereby inserting the plurality of sets of coils 23 into the bobbin 22. The plurality of protrusions 22e may protrude from the inner periphery of each of the plurality of through holes 22ca to 22cf or from the outer periphery of each of the plurality of sets of coils 23, thereby holding the connection portions 23c of each of the plurality of sets of coils 23 at a position spaced apart from the inner periphery of each of the plurality of through holes 22c. In this way, when a set of coils 23 is inserted from both ends of each of the plurality of through holes 22c of the bobbin 22, the connection portions 23c can be held at a position spaced apart from the inner surface of each of the plurality of through holes 22c. Therefore, a gap is formed between the coil and the through hole as an inflow path for the resin 24 such as molding resin or varnish, and the resin 24 can be filled evenly.

[0045] Furthermore, the length of each of the plurality of protrusions 22e protruding toward the center of the through hole 22c may be increased from both ends of the through hole 22c toward the interior of the through hole 22c. That is, as shown in FIG. 9, the length L1 of the plurality of protrusions 22e at both ends of the through hole 22c may be shorter than the length L2 of the protrusions inside the through hole 22c. This prevents the plurality of protrusions 22e from interfering with the insertion of the tips of the two coils (the first flat wire 23a and the second flat wire 23b) constituting one set of coils 23 from both ends of the through hole 22c. Meanwhile, the voids serving as the inflow paths for the resin 24 can be enlarged inside the bobbin 22 where the connection portions 23c of the set of coils 23 are provided, allowing the resin 24 to be filled evenly.

[0046] Furthermore, the edge of the opening of through hole 22c may be chamfered C1, which enlarges the opening of through hole 22c and makes it easier to insert the tip of coil 23 into through hole 22c, thereby improving workability.

[0047] Furthermore, the rotating electric machine 1 according to this embodiment can be used as a power source for industrial machinery, such as a compressor, which can prevent the refrigerant that cools the stator 2 from entering the connection portion 23c of the coil 23 in the bobbin 22 and disrupting electrical connection, thereby preventing malfunctions caused by the rotating electric machine.

[0048] (Second embodiment) Fig. 12 is an enlarged view of a cross section taken along line AA when Fig. 4 is an external perspective view of a bobbin according to a second embodiment of the present invention. Also, Fig. 13 is an enlarged view of a cross section of a connection portion between the bobbin according to the second embodiment of the present invention and a coil inserted into a through hole.

[0049] The rotating electric machine according to this embodiment differs from the rotating electric machine 1 according to the first embodiment in the locations of the through-holes 22c of the bobbin 22 from which the plurality of protrusions 22e protrude. Specifically, as shown in FIG. 13 , the four protrusions 22e are disposed in the through-holes 22c so as to face four side surfaces 23e to 23h of the set of coils 23. Furthermore, in order to fix the position of the set of coils 23 in the through-holes 22c, it is preferable that the four protrusions 22e are disposed so that each of the four pressing forces F that press the set of coils 23 by each of the four protrusions 22e is directed toward one location on the set of coils 23. The through-hole 22c is formed by four or more flat surfaces 22fa to 22fd that are continuous in the inner circumferential direction, and one or more of the plurality of protrusions 22e may be provided on each of the four or more flat surfaces 22fa to 22fd. Furthermore, when the through-hole 22c has the partition plate 22d, the plurality of protrusions 22e may be provided on four or more flat surfaces 22fa to 22fd and on the partition plate 22d.

[0050] [effect] As described above, in the rotating electric machine according to this embodiment, at least four protrusions 22e may be arranged in through-hole 22c so as to face one of four side surfaces 23e to 23h of one set of coils 23. Furthermore, multiple protrusions 22e may be provided on four or more flat surfaces 22fa to 22fd. Furthermore, when partition plate 22d is provided, protrusions 22e may be provided on partition plate 22d.

[0051] This prevents each of the multiple protrusions 22e from coming off its guide target (the four side surfaces 23e to 23h of one coil set in this embodiment). Therefore, the first and second flat wires 23a and 23b of one coil set 23 can be easily inserted into the through-hole 22c at predetermined radial and circumferential positions, enabling precise connection. Furthermore, the multiple protrusions 22e create voids around the connection portions 23c of one coil set 23 in the bobbin 22, serving as inflow paths for the resin 24, allowing the resin 24 to be evenly filled. That is, similar to the first embodiment, stress concentration in the insulating film covering the coil 23 or in parts of the bobbin 22 can be prevented, thereby preventing dielectric breakdown in the insulating film covering the coil 23 or the bobbin 22. Furthermore, intrusion of the refrigerant that cools the stator 2 into the connection portions 23c of the coil 23 in the bobbin 22 can be prevented, thereby preventing a decrease in the connection strength of the connection portions 23c and ensuring reliable electrical continuity of the coil 23.

[0052] (Third embodiment) Fig. 14 is an enlarged cross-sectional view taken along line AA when Fig. 4 is an external perspective view of a bobbin according to a third embodiment of the present invention. Also, Fig. 15 is an enlarged cross-sectional view of a connection portion between the bobbin according to the third embodiment of the present invention and a coil inserted into a through hole.

[0053] The rotating electric machine according to this embodiment differs from the rotating electric machine 1 according to the first embodiment in that no partition plate 22d is provided in the through hole 22c of the bobbin 22 between two adjacent sets of coils 23 among the multiple sets of coils 23. Specifically, in the rotating electric machine according to this embodiment, the multiple sets of coils 23 are arranged in the through hole 22c by arranging multiple sets of coils 23 along the radial direction of the stator core 21. Two of the multiple protrusions 22e are provided between two sets of coils 23 adjacent to each other in the radial direction of the stator core 21 among the multiple sets of coils 23. The two protrusions 22e may be arranged to face adjacent two of four sides 23d extending in the axial direction on the opposing surfaces of two sets of coils 23 adjacent to each other in the radial direction of the stator core 21 among the multiple sets of coils 23. Furthermore, it is preferable that each of the four protrusions 22e is arranged so that each of the four pressing forces F that press the set of coils 23 by each of the four protrusions 22e is directed toward one location on the set of coils 23.

[0054] [effect] In the rotating electric machine according to this embodiment, there is no partition plate between two adjacent sets of coils 23, and only two protrusions 22e are provided between them. This allows the cross-sectional area of ​​the coils 23 inserted into the through holes 22c to be increased, thereby increasing the space factor of the coils 23 within the through holes 22c of the bobbin 22.

[0055] Furthermore, two adjacent sets of coils 23 are held by two protrusions 22e provided between the two adjacent sets of coils 23. This makes it possible to reduce the number of protrusions 22e provided in through-hole 22c for holding multiple sets of coils 23, thereby simplifying the molding of the bobbin.

[0056] Furthermore, between two adjacent sets of coils 23, two protrusions 22e create a gap that serves as an inflow path for resin 24, allowing resin to be evenly filled around connection portion 23c. That is, similar to the first embodiment, stress concentration on the insulating film covering coil 23 or on a part of bobbin 22 can be suppressed, thereby suppressing dielectric breakdown in the insulating film covering coil 23 or in bobbin 22. Furthermore, intrusion of the refrigerant that cools stator 2 into connection portion 23c in bobbin 22 from between two adjacent sets of coils 23 can be suppressed, thereby suppressing a decrease in the connection strength of connection portion 23c, and thereby ensuring the conductivity reliability of coil 23.

[0057] The present invention is not limited to the above-described embodiments and includes various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those including all of the described configurations. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, or replace part of the configuration of each embodiment with other configurations.

[0058] The present invention may be embodied in the following manner. For example, FIG. 8 illustrates an embodiment in which corners of the plurality of protrusions 22e are joined to corners of a set of coils 23, and FIG. 13 illustrates an embodiment in which surfaces of the plurality of protrusions 22e are joined to surfaces of a set of coils 23. However, this is not limiting. For example, as shown in FIG. 16, the plurality of protrusions 22e may be flat, and the flat surfaces of the plurality of protrusions 22e may be joined to corners of a set of coils 23. Furthermore, as shown in FIG. 9, the plurality of flat-corner protrusions 22e may have a length L2 inside the through hole 22c longer than a length L1 at the openings at both ends of the through hole 22c. In other words, the length of the protrusions 22e protruding toward the center of the through hole 22c may be increased from both ends of the through hole 22c toward the interior of the through hole 22c. [Explanation of symbols]

[0059] REFERENCE SIGNS LIST 1... rotating electric machine, 2... stator (stator), 21... stator core, 21a... slot, 22... bobbin, 22c... through hole, 22ca, 22cb, 22cc, 22cd, 22ce, 22cf... insertion hole, 22d... partition plate, 22e... protrusion, 22fa, 22fb, 22fc, 22fd... flat surface, 23... coil, 23a... first rectangular wire, 23aa... protrusion portion, 23b... second rectangular wire, 23ba... groove portion, 23c... connection portion, 23d... edge, 23e to 23h... side surface, 24, 24a to 24d... resin

Claims

1. A stator core having slots; a bobbin fitted in the slot and having a through hole passing through in the axial direction of the stator core; a coil inserted into the through hole; a plurality of protrusions protruding from an inner periphery of the through hole and guiding the position of the coil in the through hole; a rotating electric machine including a resin filled around the coil in the through hole, The coil is a set of coils having a connection portion within the bobbin, and is a flat wire; the resin is filled around the connection portion in the through hole, the plurality of protrusions are at least four protrusions, and are arranged in the through holes so as to face four sides of the set of coils that extend in the axial direction of the stator core, The through hole is configured with four or more planes that are continuous in the inner circumferential direction thereof, The rotating electric machine is characterized in that the plurality of protrusions are provided at corners where two adjacent flat surfaces intersect among the four or more flat surfaces.

2. A stator core having slots; a bobbin fitted in the slot and having a through hole passing through in the axial direction of the stator core; a coil inserted into the through hole; a plurality of protrusions protruding from an inner periphery of the through hole and guiding the position of the coil in the through hole; a rotating electric machine including a resin filled around the coil in the through hole, The coil is a set of coils having a connection portion within the bobbin, and is a flat wire; the resin is filled around the connection portion in the through hole, the plurality of protrusions are at least four protrusions, and are arranged in the through holes so as to face four sides of the set of coils that extend in the axial direction of the stator core, The through hole is configured with four or more planes that are continuous in the inner circumferential direction thereof, A rotating electric machine characterized in that the plurality of protrusions are provided on each of the four or more flat surfaces that face one of the four side surfaces of the set of coils.

3. A stator core having slots; a bobbin fitted in the slot and having a through hole passing through in the axial direction of the stator core; a coil inserted into the through hole; a plurality of protrusions protruding from an inner periphery of the through hole and guiding the position of the coil in the through hole; a rotating electric machine including a resin filled around the coil in the through hole, The coil is a set of coils having a connection portion within the bobbin, and is a flat wire; the resin is filled around the connection portion in the through hole, the plurality of protrusions are at least four protrusions, and are arranged in the through holes so as to face four sides of the set of coils that extend in the axial direction of the stator core, A plurality of sets of coils are arranged in the through hole by arranging a plurality of sets of coils along the radial direction of the stator core, The stator core further includes a partition plate provided between two sets of coils adjacent to each other in the radial direction of the stator core, among the plurality of sets of coils, At least four of the plurality of protrusions are arranged around each of the plurality of sets of coils; The through hole is configured with four or more planes that are continuous in the inner circumferential direction thereof, A rotating electric machine characterized in that the multiple protrusions are provided at corners where two adjacent planes intersect among the four or more planes, and at corners where one of the four or more planes intersects with the partition plate.

4. A stator core having slots; a bobbin fitted in the slot and having a through hole passing through in the axial direction of the stator core; a coil inserted into the through hole; a plurality of protrusions protruding from an inner periphery of the through hole and guiding the position of the coil in the through hole; a rotating electric machine including a resin filled around the coil in the through hole, The coil is a set of coils having a connection portion within the bobbin, and is a flat wire; the resin is filled around the connection portion in the through hole, the plurality of protrusions are at least four protrusions, and are arranged in the through hole so as to face each of four side surfaces of the set of coils; A plurality of sets of coils are arranged in the through hole by arranging a plurality of sets of coils along the radial direction of the stator core, The stator core further includes a partition plate provided between two sets of coils adjacent to each other in the radial direction of the stator core, among the plurality of sets of coils, At least four of the plurality of protrusions are arranged around each of the plurality of sets of coils; The through hole is configured with four or more planes that are continuous in the inner circumferential direction thereof, A rotating electric machine characterized in that the multiple protrusions are provided at corners where two adjacent planes intersect among the four or more planes, and at corners where one of the four or more planes intersects with the partition plate.

5. A stator core having slots; a bobbin fitted in the slot and having a through hole passing through in the axial direction of the stator core; a coil inserted into the through hole; a plurality of protrusions protruding from an inner periphery of the through hole and guiding the position of the coil in the through hole; a rotating electric machine including a resin filled around the coil in the through hole, The coil is a set of coils having a connection portion within the bobbin, and is a flat wire; the resin is filled around the connection portion in the through hole, the plurality of protrusions are at least four protrusions, and are arranged in the through holes so as to face four sides of the set of coils that extend in the axial direction of the stator core, A plurality of sets of coils are arranged in the through hole by arranging a plurality of sets of coils along the radial direction of the stator core, The stator core further includes a partition plate provided between two sets of coils adjacent to each other in the radial direction of the stator core, among the plurality of sets of coils, At least four of the plurality of protrusions are arranged around each of the plurality of sets of coils; The through hole is configured with four or more planes that are continuous in the inner circumferential direction thereof, The rotating electric machine is characterized in that the plurality of protrusions are provided on the four or more flat surfaces and on the partition plate.

6. A stator core having slots; a bobbin fitted in the slot and having a through hole passing through in the axial direction of the stator core; a coil inserted into the through hole; a plurality of protrusions protruding from an inner periphery of the through hole and guiding the position of the coil in the through hole; a rotating electric machine including a resin filled around the coil in the through hole, The coil is a set of coils having a connection portion within the bobbin, and is a flat wire; the resin is filled around the connection portion in the through hole, the plurality of protrusions are at least four protrusions, and are arranged in the through hole so as to face each of four side surfaces of the set of coils; A plurality of sets of coils are arranged in the through hole by arranging a plurality of sets of coils along the radial direction of the stator core, The stator core further includes a partition plate provided between two sets of coils adjacent to each other in the radial direction of the stator core, among the plurality of sets of coils, At least four of the plurality of protrusions are arranged around each of the plurality of sets of coils; The through hole is configured with four or more planes that are continuous in the inner circumferential direction thereof, The rotating electric machine is characterized in that the plurality of protrusions are provided on the four or more flat surfaces and on the partition plate.

7. 7. A rotating electric machine according to claim 1, a plurality of through holes are formed in the bobbin as the through holes, a plurality of sets of coils are inserted into the bobbin by inserting the set of coils into each of the plurality of through holes, A rotating electric machine characterized in that the multiple protrusions protrude from the inner circumference of each of the multiple through holes and hold the connection portions of each of the multiple sets of coils at a position away from the inner circumference of each of the multiple through holes.

8. 7. A rotating electric machine according to claim 1, A rotating electric machine, characterized in that the length of each of the plurality of protrusions protruding toward the center of the through hole increases from both ends of the through hole toward the inside of the through hole.

9. 7. A rotating electric machine according to claim 1, A rotating electric machine characterized in that the edge of the opening of the through hole is chamfered.

10. An industrial machine comprising the rotating electric machine according to any one of claims 1 to 6.

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