motor

Abstract

To provide a motor capable of corresponding to change of a parallel number of electric circuits without requiring a manual complicated wire connection work and a dedicated connection board.SOLUTION: A motor includes a plurality of split cores, a plurality of coils wound around the plurality of split cores, an annular member having a plurality of wiring grooves and a plurality of terminal connecting holes formed thereon, and a plurality of connecting conductors and a plurality of input conductors arranged in the wiring grooves, and has an electric circuit in which the plurality of coils, the plurality of connecting conductors and the plurality of input conductors are electrically connected. The plurality of connecting conductors and the plurality of input conductors have terminals, respectively, and the terminals are fixed to terminal connecting holes by the joint fastening.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a motor. [Background technology]

[0002] To curb global warming, there is a need to develop technologies that reduce carbon dioxide emissions. For this reason, there are high hopes for improving the efficiency and power output of motors. Approximately 70% of the electricity used in industry and approximately 40% of the electricity used in homes are consumed by motors. Therefore, it is said that simply improving the efficiency of a single motor by a few percent can achieve energy savings equivalent to a power plant with a capacity of several hundred thousand kW, contributing to a reduction of several million tons of carbon dioxide emissions per year. Meanwhile, in recent years, the use of electric vehicles has become remarkable, also with the aim of reducing carbon dioxide emissions. This has led to an ever-increasing demand for smaller, more powerful motors to provide output that can replace that of internal combustion engines.

[0003] Among conventional motors, there are known ones that employ a configuration in which the stator core is divided in the circumferential direction (see, for example, Patent Document 1). In this type of motor, one magnetic pole is formed by winding a coil around the divided core. In this case, even if the number of magnetic poles of the motor is the same, changing the number of parallel circuits in the electric circuit (motor circuit) that includes the coil changes the motor output. In other words, changing the number of parallel circuits can result in motors with different outputs. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-259259 Summary of the Invention [Problem to be solved by the invention]

[0005] Generally, a motor's electrical circuit has an M series / N parallel configuration, where M is the number of coils connected in series and N is the number of parallel connections of the M series-connected coils (hereinafter referred to as the "parallel number"). In such motor electrical circuits, there is a demand for changing the parallel number (the values of N and M). To cite a specific example, in an elevator hoist that uses a motor as its drive source, there is a demand for changing the parallel number of the electrical circuit in order to switch the motor's output performance according to the hoist's capacity.

[0006] The number of parallel electrical circuits can be changed by manually stripping the insulation from the end of each coil and crimping a coated cable to the end of the coil using a connection terminal, then changing where both ends of the cable are connected. However, this method requires the worker to perform complicated wiring work, such as changing the connection position between the coil end and the cable or changing the cable layout depending on the number of parallel electrical circuits. Another method is to use a wiring board with connecting conductors and other components attached to a resin member, but this method requires the preparation of a dedicated wiring board corresponding to the number of parallel electrical circuits.

[0007] The present invention has been made to solve the above-mentioned problems, and its object is to provide a motor that can accommodate changes in the number of parallel electrical circuits without requiring complicated manual wiring work or a dedicated wiring board. [Means for solving the problem]

[0008] In order to solve the above problems, for example, the configurations described in the claims are adopted. The present application includes multiple means for solving the above-mentioned problems, one of which is a motor having an electric circuit including a plurality of divided cores arranged in a circumferential direction, a plurality of coils wound around the plurality of divided cores, an annular member formed with a plurality of wiring grooves and a plurality of terminal connection holes, and a plurality of connecting conductors and a plurality of input conductors disposed in the wiring grooves, the plurality of coils, the plurality of connecting conductors, and the plurality of input conductors. The plurality of connecting conductors and the plurality of input conductors each have terminals, and the terminals are fastened together in the terminal connection holes. [Effects of the Invention]

[0009] According to the present invention, it is possible to accommodate changes in the number of parallel electrical circuits without requiring cumbersome manual wiring work or a dedicated wiring board. Problems, configurations, and effects other than those described above will become apparent from the following description of the embodiments. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic cross-sectional view showing the structure of a motor according to a first embodiment. [Figure 2] FIG. 2 is a perspective view showing the structure of a split core. [Figure 3] FIG. 2 is a perspective view showing a state in which a coil is wound around a split core. [Figure 4] FIG. 2 is a perspective view showing an example of a winding configuration of a coil. [Figure 5] FIG. 2 is a perspective view showing the configuration of a stator according to the first embodiment. [Figure 6] 2 is a perspective view showing a state in which a wire connection plate is assembled to a stator in the motor according to the first embodiment. FIG. [Figure 7] FIG. 2 is a perspective view showing the configuration of an annular member in the first embodiment. [Figure 8] FIG. 8 is a plan view of the annular member shown in FIG. [Figure 9] FIG. 2 is a perspective view showing the configuration of a coil terminal connecting conductor in the first embodiment. [Figure 10]FIG. 2 is a perspective view showing the configuration of a neutral point connecting conductor in the first embodiment. [Figure 11] FIG. 2 is a perspective view showing the configuration of a conductor for connecting coils in the first embodiment. [Figure 12] FIG. 2 is a perspective view showing a configuration of an input conductor in the first embodiment. [Figure 13] 3 is a plan view showing a state in which only the coil terminal connecting conductor is attached to the annular member in the first embodiment. FIG. [Figure 14] 3 is a plan view showing a state in which only a neutral point connecting conductor is attached to an annular member in the first embodiment. FIG. [Figure 15] 3 is a plan view showing a state in which only the coil-to-coil connection conductor is attached to the annular member in the first embodiment. FIG. [Figure 16] 3 is a plan view showing a state in which only input conductors are attached to the annular member in the first embodiment. FIG. [Figure 17] FIG. 10 is a plan view showing the configuration of a connection board in the case of 6 series and 2 parallel. [Figure 18] FIG. 10 is a perspective view showing a state in which a coil terminal and a coil terminal connecting conductor are joined by thermal caulking. [Figure 19] This is a diagram showing the electrical circuit of a motor in the case of 6 in series and 2 in parallel. [Figure 20] FIG. 10 is a perspective view showing the configuration of a neutral point connecting conductor used when the electric circuit of the motor is configured in three series and four parallel configurations. [Figure 21] 3 is a plan view showing a state in which only a neutral point connecting conductor is attached to an annular member in the first embodiment. FIG. [Figure 22] 3 is a plan view showing a state in which only input conductors are attached to the annular member in the first embodiment. FIG. [Figure 23] FIG. 10 is a plan view showing the configuration of a connection board in the case of a 3-in-series, 4-in-parallel configuration. [Figure 24] This is a diagram showing the electrical circuit of a motor in the case of 3 in series and 4 in parallel. [Figure 25] FIG. 10 is an enlarged perspective view of a main part of a motor according to a second embodiment. [Figure 26]FIG. 10 is a plan view showing the configuration of an annular member in a third embodiment. [Figure 27] FIG. 11 is a plan view showing a state in which only the coil terminal connecting conductor is attached to the annular member in the third embodiment. [Figure 28] FIG. 11 is a perspective view showing the configuration of a conductor for connecting coils in a third embodiment. [Figure 29] FIG. 11 is a plan view showing a state in which only the coil-to-coil connection conductors are attached to the annular member in the third embodiment. [Figure 30] FIG. 11 is a plan view showing a state in which only a neutral point connecting conductor is attached to an annular member in the third embodiment. [Figure 31] FIG. 11 is a plan view showing a state in which only the input conductor is attached to the annular member in the third embodiment. [Figure 32] FIG. 11 is a plan view showing the configuration of a connection board in the case of 6 series and 2 parallel in the third embodiment. [Figure 33] FIG. 10 is an enlarged cross-sectional view of a main part of a motor according to a fourth embodiment. [Figure 34] FIG. 10 is an enlarged cross-sectional view of a main part of a motor according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this specification and the drawings, elements having substantially the same functions or configurations are designated by the same reference numerals, and redundant description will be omitted.

[0012] First Embodiment FIG. 1 is a schematic cross-sectional view showing the structure of a motor according to a first embodiment. As shown in Fig. 1, the motor 100 includes a stator 1, a rotor 3, a stator housing 10, and a connection plate 26. The stator 1 has split cores 4 (see Fig. 2) and coils 6, and the rotor 3 has permanent magnets 2. The motor 100 is a so-called outer rotor motor in which a portion of the rotor 3 is disposed radially outward of the stator 1 when viewed from the central axis J of rotation of the motor 100. The motor 100 is also a so-called concentrated winding motor in which a coil 6 is wound around each split core 4.

[0013] The rotor 3 is formed in a cylindrical shape. The rotor 3 is rotatably supported by bearings (not shown) on the outer periphery of the stator 1. A plurality of permanent magnets 2 are attached to the inner periphery of the rotor 3. In this embodiment, as an example, a case where the number of magnetic poles of the motor 100 is 36 will be described.

[0014] FIG. 2 is a perspective view showing the structure of the split core. As shown in Fig. 2, the split core 4 has integral teeth 4a and connecting portions 4b. The split core 4 is formed, for example, by punching electromagnetic steel sheets with a thickness of approximately 0.1 mm to 0.5 mm and laminating a predetermined number of sheets by means of crimping, welding, or adhesive bonding with resin. The surfaces of the electromagnetic steel sheets are coated with an insulating coating to prevent current flow. The teeth 4a are the portions around which the coil 6 is wound. The connecting portions 4b are the portions for connecting the split cores 4 together.

[0015] The connecting portion 4b is formed with a protrusion 4c, a recessed groove 4d, and a through hole 4e. The protrusion 4c and the recessed groove 4d are formed along the thickness direction of the split core 4. The through hole 4e is formed to penetrate the split core 4 in the thickness direction. The core of the stator 1 is formed by arranging multiple split cores 4 in the circumferential direction. Two split cores 4 that are adjacent in the circumferential direction are connected to each other by fitting the protrusion 4c of one split core 4 into the recessed groove 4d of the other split core 4.

[0016] As shown in Fig. 3, a bobbin 5 made of an insulating material is attached to the split core 4. A coil 6 is wound around the teeth 4a (Fig. 2) of the split core 4 via the bobbin 5, thereby forming one magnetic pole 7. The insulating material that makes up the bobbin 5 can be, for example, a resin such as PBT (polybutylene terephthalate), PPS (polyphenylene sulfide), or LCP (liquid crystal polymer).

[0017] The coil 6 is made of enameled wire with a flat cross section or enameled wire with a round cross section. When the coil 6 is made of enameled wire with a flat cross section, the density (space factor) of the conductor in the slots formed between adjacent split cores 4 in the circumferential direction can be increased. Furthermore, when the coil 6 is made of enameled wire with a round cross section, the end 9 of the coil 6 can be easily positioned by bending the end 9, because enameled wire with a round cross section can be easily bent in any direction.

[0018] Terminal 9 of coil 6 is formed by removing the insulating coating from an enameled wire. If coil 6 is made of rectangular enameled wire, the insulating coating can be removed using a grinder or mold (not shown). If coil 6 is made of enameled wire with a round cross section, the insulating coating can be removed using a rotary cutter (not shown). In either case, terminal 9 of coil 6 can be connected to the corresponding connecting conductor (described below) by a predetermined joining means.

[0019] FIG. 4 is a perspective view showing an example of a winding configuration of the coil. As shown in FIG. 4, the coil 6 is wound continuously around three adjacent split cores 4. In other words, a single enameled wire constituting the coil 6 is wound around each of the three split cores 4 with a predetermined number of winding turns. In other words, the three coils 6 corresponding one-to-one to the three split cores 4 are each made of a single enameled wire. One end 9 of the coil 6 is positioned so as to protrude upward on the split core 4 on the left side of FIG. 4, and the other end 9 of the coil 6 is positioned so as to protrude upward on the split core 4 on the right side of FIG. 4. By winding the coils 6 in this manner, the three coils 6 are connected in series in the electric circuit of the motor 100.

[0020] FIG. 5 is a perspective view showing the configuration of the stator according to the first embodiment. In FIG. 5, the stator 1 is configured by assembling a plurality of magnetic poles 7 (36 in this embodiment) in an annular shape. Each magnetic pole 7 is formed by combining one split core 4 and one coil 6. Therefore, 36 split cores 4 are arranged in the circumferential direction of the stator 1. The 36 split cores 4 are assembled in an annular shape by fitting the protrusions 4c into the recessed grooves 4d. Each split core 4 is sandwiched between a pair of upper and lower ring members 8a, 8b and fixed by tightening a plurality of bolts 11. The male threads of the bolts 11 are inserted into through holes 4e (FIG. 2) provided in the split core 4. The male threads of the bolts 11 are engaged with female threads (not shown) provided in the ring member 8b.

[0021] FIG. 6 is a perspective view showing a state in which a wire connection plate is attached to the stator in the motor according to the first embodiment. The connection plate 26 is composed of an annular member 12 (FIG. 7) made of an insulating material, and a plurality of connection conductors and a plurality of input conductors attached to the annular member 12. The connection conductors and input conductors will be described in detail later. The annular member 12 is made of a resin such as PBT (polybutylene terephthalate), PPS (polyphenylene sulfide), or LCP (liquid crystal polymer). However, instead of making the entire annular member 12 out of an insulating material, the outer shape of the annular member 12 may be made of a conductor and the surface of the conductor may be coated with an insulating coating to ensure insulation from the connection conductors and input conductors. The components of the connection plate 26 will be described in detail below.

[0022] FIG. 7 is a perspective view showing the configuration of the annular member in the first embodiment, and FIG. 8 is a plan view of the annular member shown in FIG. 7, a plurality of first wiring grooves 14, a plurality of terminal connection holes 16, a second wiring groove 18, a third wiring groove 20, and a fourth wiring groove 22 are formed on the upper surface side of the annular member 12. Meanwhile, a plurality of recesses 40 are formed on the lower surface side of the annular member 12. The recesses 40 are formed to avoid interference between the bolts 11 (FIG. 5) and the annular member 12.

[0023] The first wiring grooves 14 are formed in an L-shape in plan view. The multiple first wiring grooves 14 are formed in the outermost periphery of the annular member 12. The multiple first wiring grooves 14 are formed so that two adjacent first wiring grooves 14 are closely spaced in the circumferential direction of the annular member 12 to form a pair.

[0024] The terminal connection holes 16 are formed in a circular shape in a plan view. The terminal connection holes 16 are formed in the outermost periphery of the annular member 12. The terminal connection holes 16 are also formed in recessed portions 41 that are flush with the bottom surface of the first wiring groove 14. The recessed portions 41 are formed in a triangular (mountain-shaped) shape in a plan view. In this embodiment, the terminal connection holes 16 are screw holes.

[0025] The second wiring groove 18, the third wiring groove 20, and the fourth wiring groove 22 are formed concentrically. The second wiring groove 18 is formed at a position adjacent to the recessed portion 41 in the radial direction of the annular member 12. The third wiring groove 20 is formed between the second wiring groove 18 and the fourth wiring groove 22. The fourth wiring groove 22 is formed at the innermost periphery of the annular member 12. A partition portion 42 is provided between the third wiring groove 20 and the fourth wiring groove 22. The partition portion 42 has a plurality of conductor lead-out portions 42a (FIG. 7). The conductor lead-out portion 42a is formed in a concave shape to lead the input conductor 21 (FIG. 12) arranged in the fourth wiring groove 22 outward in the radial direction of the annular member 12.

[0026] Next, the connecting conductor will be described with reference to FIGS. The connecting conductors include coil end connecting conductors 13a and 13b (Fig. 9), neutral point connecting conductor 17 (Fig. 10), and inter-coil connecting conductor 19 (Fig. 11). Coil end connecting conductors 13a and 13b are conductors for connecting terminals 9 of coils 6. Neutral point connecting conductor 17 is a conductor for connecting coils 6 to a neutral point. Inter-coil connecting conductor 19 is a conductor for connecting coils 6 together. Each connecting conductor will be described in detail below.

[0027] As shown in FIG. 9, coil terminal connection conductor 13a is L-shaped, and coil terminal connection conductor 13b is also L-shaped. However, coil terminal connection conductor 13a is longer than coil terminal connection conductor 13b. Coil terminal connection conductors 13a and 13b are made of metal. Coil terminal connection conductors 13a and 13b are integrally molded metal products obtained by shaping a conductive plate such as copper through press processing (punching and bending). One end of coil terminal connection conductor 13a is formed with round terminal 15a, and the other end of coil terminal connection conductor 13a is formed with heat crimping terminal 23a. Similarly, one end of coil terminal connection conductor 13b is formed with round terminal 15b, and the other end of coil terminal connection conductor 13b is formed with heat crimping terminal 23b. A round terminal is a terminal with a circular hole.

[0028] As shown in FIG. 10, the neutral point connecting conductor 17 is formed in an arc shape (C-shape). The neutral point connecting conductor 17 is formed by a single-piece metal molding. Six round terminals 28a, 28b, 28c, 28d, 28e, and 28f are formed on the neutral point connecting conductor 17. The neutral point connecting conductor 17 is obtained by shaping a conductive plate made of copper or the like by press working (punching and bending). The surface of the neutral point connecting conductor 17, except for the round terminals 28a to 28f, is covered with an insulating film such as resin. The neutral point connecting conductor 17 is used when the motor's electrical circuit is configured in six series and two parallel configurations.

[0029] 11, the coil-to-coil connecting conductor 19 is composed of an insulated cable 24 made of a sheathed multi-core cable, and round terminals 30a, 30b connected to both ends of the insulated cable 24. The round terminals 30a, 30b are electrically and mechanically connected to the ends of the insulated cable 24 by, for example, mechanical crimping or welding.

[0030] Next, the input conductor will be described with reference to FIG. 12, the input conductor 21 is composed of a coated multi-core cable 37 and a round terminal 31 connected to the end of the multi-core cable 37. The round terminal 31 is electrically and mechanically connected to the end of the multi-core cable 37 by, for example, mechanical crimping or welding.

[0031] FIG. 13 is a plan view showing a state in which only the coil end connecting conductors 13a and 13b are attached to the annular member 12 in the first embodiment. As shown in FIG. 13 , a total of 24 coil terminal connection conductors 13a, 13b are attached to the annular member 12. The coil terminal connection conductors 13a, 13b are arranged in the corresponding first wiring grooves 14. The round terminals 15a of the coil terminal connection conductors 13a are arranged concentrically with the terminal connection holes 16, and the heat crimping terminals 23a of the coil terminal connection conductors 13a are arranged so as to protrude radially outward from the outer periphery of the annular member 12. Similarly, the round terminals 15b of the coil terminal connection conductors 13b are arranged concentrically with the terminal connection holes 16, and the heat crimping terminals 23b of the coil terminal connection conductors 13b are arranged so as to protrude radially outward from the outer periphery of the annular member 12. Note that arranging the round terminals concentrically with the terminal connection holes does not necessarily mean concentric in the strict sense, but also includes a state in which the holes of the round terminals overlap the terminal connection holes.

[0032] FIG. 14 is a plan view showing a state in which only the neutral point connecting conductor 17 is attached to the annular member 12 in the first embodiment. 14, the neutral point connecting conductor 17 is disposed in the second wiring groove 18. Six round terminals 28a, 28b, 28c, 28d, 28e, and 28f of the neutral point connecting conductor 17 are disposed concentrically with the corresponding terminal connection holes 16.

[0033] 15 is a plan view showing the state in which only the coil-to-coil connection conductors 19 are attached to the annular member 12 in the first embodiment. When the motor's electric circuit has a 6-in-series, 2-in-parallel configuration, six coil-to-coil connection conductors 19 are used. In the following description, the six coil-to-coil connection conductors 19 are distinguished by different reference numerals 19a, 19b, 19c, 19d, 19e, and 19f. However, when there is no need to distinguish between the six coil-to-coil connection conductors 19a to 19f, they will be collectively referred to as the coil-to-coil connection conductors 19.

[0034] As shown in FIG. 15 , six inter-coil connection conductors 19a, 19b, 19c, 19d, 19e, and 19f are disposed in the third wiring groove 20. Furthermore, the inter-coil connection conductors 19a, 19b, and 19c and the inter-coil connection conductors 19d, 19e, and 19f are disposed at different positions in the circumferential direction of the annular member 12. Specifically, the inter-coil connection conductor 19a and the inter-coil connection conductor 19d are disposed at positions offset by 180° in the circumferential direction of the annular member 12. Similarly, the inter-coil connection conductor 19b and the inter-coil connection conductor 19e are disposed at positions offset by 180° in the circumferential direction of the annular member 12, and the inter-coil connection conductor 19c and the inter-coil connection conductor 19f are also disposed at positions offset by 180° in the circumferential direction of the annular member 12.

[0035] Furthermore, the inter-coil connection conductors 19a, 19b, and 19c are arranged so as to partially overlap one another in the circumferential direction of the annular member 12, and the inter-coil connection conductors 19d, 19e, and 19f are also arranged so as to partially overlap one another in the circumferential direction of the annular member 12. The round terminals 30a of each of the inter-coil connection conductors 19a, 19b, 19c, 19d, 19e, and 19f are arranged concentrically with the corresponding terminal connection holes 16, and the round terminals 30b of each of the inter-coil connection conductors 19a, 19b, 19c, 19d, 19e, and 19f are also arranged concentrically with the corresponding terminal connection holes 16.

[0036] In the circumferential direction of the annular member 12, the round terminal 30a of the inter-coil connection conductor 19a and the round terminal 30b of the inter-coil connection conductor 19c are arranged adjacent to each other, and the round terminal 30a of the inter-coil connection conductor 19d and the round terminal 30b of the inter-coil connection conductor 19f are arranged adjacent to each other. In addition, in the circumferential direction of the annular member 12, the round terminal 30b of the inter-coil connection conductor 19a and the round terminal 30b of the inter-coil connection conductor 19b are arranged adjacent to each other, and the round terminal 30a of the inter-coil connection conductor 19b and the round terminal 30a of the inter-coil connection conductor 19c are arranged adjacent to each other. Furthermore, in the circumferential direction of the annular member 12, the round terminal 30b of the inter-coil connection conductor 19d and the round terminal 30b of the inter-coil connection conductor 19e are arranged adjacent to each other, and the round terminal 30a of the inter-coil connection conductor 19e and the round terminal 30a of the inter-coil connection conductor 19f are arranged adjacent to each other. Furthermore, in the circumferential direction of the annular member 12, the round terminal 30b of the inter-coil connection conductor 19a and the round terminal 30a of the inter-coil connection conductor 19f are arranged adjacent to each other, and the round terminal 30a of the inter-coil connection conductor 19c and the round terminal 30b of the inter-coil connection conductor 19d are arranged adjacent to each other.

[0037] 16 is a plan view showing a state in which only the input conductors 21 are attached to the annular member 12 in the first embodiment. When the motor's electric circuit has a 6-in-series, 2-in-parallel configuration, six input conductors 21 are used. In the following description, the six input conductors 21 are distinguished by different reference numerals 21a, 21b, 21c, 21d, 21e, and 21f, and the round terminals 31 of each input conductor 21 are distinguished by different reference numerals 31a, 31b, 31c, 31d, 31e, and 31f. However, when it is not necessary to distinguish between the six input conductors 21a to 21f, they will be collectively referred to as input conductors 21, and when it is not necessary to distinguish between the six round terminals 31a to 31f, they will be collectively referred to as round terminals 31.

[0038] 16, the six input conductors 21a, 21b, 21c, 21d, 21e, and 21f are arranged in the fourth wiring groove 22. The input conductors 21a, 21b, and 21c and the input conductors 21d, 21e, and 21f are arranged at different positions in the circumferential direction of the annular member 12. The input conductors 21a, 21b, and 21c are arranged so as to partially overlap each other in the circumferential direction of the annular member 12, and the input conductors 21d, 21e, and 21f are also arranged so as to partially overlap each other in the circumferential direction of the annular member 12. The round terminals 31a, 31b, 31c, 31d, 31e, and 31f of the input conductors 21a, 21b, 21c, 21d, 21e, and 21f are arranged concentrically with the corresponding terminal connection holes 16.

[0039] In the circumferential direction of the annular member 12, the round terminal 31a of the input conductor 21a and the round terminal 31b of the input conductor 21b are arranged adjacent to each other, and the round terminal 31b of the input conductor 21b and the round terminal 31c of the input conductor 21c are arranged adjacent to each other. In addition, in the circumferential direction of the annular member 12, the round terminal 31d of the input conductor 21d and the round terminal 31e of the input conductor 21e are arranged adjacent to each other, and the round terminal 31e of the input conductor 21e and the round terminal 31f of the input conductor 21f are arranged adjacent to each other.

[0040] FIG. 17 is a plan view showing the configuration of the connection board 26 in the case of a 6-in-series, 2-in-parallel configuration. As shown in Fig. 17, the connection plate 26 is formed by attaching the connecting conductors (coil terminal connecting conductors 13a, 13b, neutral point connecting conductor 17, and inter-coil connecting conductor 19) and the input conductor 21 to the annular member 12 as described above. A bolt 27 is attached to each of the multiple terminal connecting holes 16 (Figs. 7 and 8) provided in the annular member 12. The bolt 27 is tightened with the male thread of the bolt 27 engaged with the terminal connecting holes 16, which are screw holes.

[0041] At the P1 position, bolt 27 fastens together the terminal of coil end connection conductor 13a and the terminal of neutral point connection conductor 17 to terminal connection hole 16. At the P2 position, bolt 27 fastens together the terminals of coil end connection conductors 13a and 13b and the terminal of inter-coil connection conductor 19 to terminal connection hole 16, and at the P3 position, bolt 27 fastens together the terminal of coil end connection conductor 13b and the terminal of input conductor 21 to terminal connection hole 16. Fastening together means fastening multiple terminals together, and more specifically, fastening multiple terminals together in an overlapping state.

[0042] More specifically, at the P1 position, the round terminals 28a, 28b, 28c, 28d, 28e, and 28f of the neutral point connecting conductor 17 and the corresponding round terminal 15a of the coil end connecting conductor 13a are fastened together by the bolt 27. At the P2 position, the round terminal 15a of the coil end connecting conductor 13a and the round terminal 30b of the inter-coil connecting conductor 19 are fastened together by the bolt 27, and the round terminal 15b of the coil end connecting conductor 13b and the round terminal 30a of the inter-coil connecting conductor 19 are also fastened together by the bolt 27. Also, at the P3 position, the round terminals 31 (31a, 31b, 31c, 31d, 31e, 31f) of the input conductors 21 (21a, 21b, 21c, 21d, 21e, 21f) and the corresponding round terminals 15b of the coil terminal connection conductor 13b are fastened together by bolts 27.

[0043] The connection plate 26 configured as described above is mounted on the stator housing 10 shown in FIG. 1. The annular member 12, which serves as the base member of the connection plate 26, is fixed to the stator housing 10 by adhesive or the like. The bolts 11 (FIG. 5) attached to the ring member 8a are disposed in the recesses 40 (FIG. 7) formed on the underside of the annular member 12. As shown in FIGS. 6 and 18, the terminals 9 of the coils 6 are joined by fusing (heat crimping) to the heat crimping terminals 23a, 23b of the coil end connection conductors 13a, 13b. In this case, if the coils 6 are made of enameled wire with a round cross section, when the heat crimping terminals 23a, 23b apply pressure to the terminals 9 of the coils 6, the heat crimping terminals 23a, 23b contact the terminals 9 in a point-contact state, enabling good fusing.

[0044] By electrically connecting the plurality of coils 6 using the connection plate 26 in this way, the electric circuit of the motor 100 has a 6-in-series, 2-in-parallel configuration as shown in FIG. As can be seen from FIG. 19 , motor 100 is a three-phase motor including a U-phase coil, a V-phase coil, and a W-phase coil. Each phase is composed of 12 coils 6. Therefore, motor 100, which is a three-phase motor, has a total of 36 coils 6. An AC voltage is applied to each phase coil via a corresponding input conductor 21. The coils of each phase are also connected by a neutral point connecting conductor 17. Of the 12 coils 6 belonging to the U-phase coil, six coils 6 are connected in series via inter-coil connecting conductors 19, and the other six coils 6 are also connected in series via inter-coil connecting conductors 19. The six series-connected coils 6 are then connected in parallel. In other words, the U-phase coil has a six-in-series, two-in-parallel configuration. This is also true for the V-phase coil and the W-phase coil.

[0045] Next, a method for changing the number of coils connected in parallel in the electric circuit of the motor will be described. First, the electrical circuit shown in Figure 19 has a 6-series, 2-parallel configuration, so the number of parallel coils is 2. In contrast, if the electrical circuit of motor 100 is switched from a 6-series, 2-parallel configuration to a 3-series, 4-parallel configuration, the number of parallel coils doubles compared to the 6-series, 2-parallel configuration, i.e., becomes 4. When the same voltage is applied to the input conductors 21 of each phase of the electric circuit, the current flowing through each coil 6 varies depending on the number of parallel coils, even if the motor 100 has the same number of magnetic poles 7. For example, if the resistance values (conductor area and number of winding turns) of the coils 6 of each magnetic pole 7 are the same, the current flowing through each coil 6 in an electric circuit with 3 in series and 4 in parallel will be four times that in an electric circuit with 6 in series and 2 in parallel. In other words, even with motors with the same number of magnetic poles, different outputs can be obtained by changing the number of parallel coils.

[0046] When switching the electric circuit of the motor 100 from 6 in series, 2 in parallel to 3 in series, 4 in parallel, the annular member 12 and the coil end connecting conductors 13a, 13b are the same as in the 6 in series, 2 in parallel configuration, but the coil-to-coil connecting conductors 19 are not used. Therefore, when switching the electric circuit, it is not necessary to attach or detach the annular member 12, but it is necessary to remove the coil-to-coil connecting conductors 19 (19a to 19f) from the annular member 12. In other words, in the case of 3 in series, 4 in parallel configuration, no connecting conductors are placed in the third wiring groove 20 of the annular member 12.

[0047] Furthermore, when switching the electric circuit of the motor 100 from a 6-in-series, 2-in-parallel configuration to a 3-in-series, 4-in-parallel configuration, a neutral point connecting conductor 32 shown in FIG. 20 is used instead of the neutral point connecting conductor 17 shown in FIG. 10 above. The neutral point connecting conductor 32 is formed in an arc shape (C-shape). The neutral point connecting conductor 32 is formed by a single-piece molding of metal. Twelve round terminals 33a, 33b, 33c, 33d, 33e, 33f, 33g, 33h, 33i, 33j, 33k, and 33l are formed on the neutral point connecting conductor 32. The neutral point connecting conductor 32 is obtained by shaping a conductor plate made of copper or the like by press processing (punching and bending). The surface of the neutral point connecting conductor 32, except for the round terminals 33a to 33l, is covered with an insulating coating such as resin.

[0048] FIG. 21 is a plan view showing a state in which only the neutral point connecting conductor 32 is attached to the annular member 12 in the first embodiment. 21 , the neutral point connecting conductor 32 is disposed in the second wiring groove 18. The twelve round terminals 33a, 33b, 33c, 33d, 33e, 33f, 33g, 33h, 33i, 33j, 33k, and 33l of the neutral point connecting conductor 32 are disposed concentrically with the corresponding terminal connection holes 16.

[0049] Furthermore, when the electric circuit of the motor 100 is switched from 6 in series and 2 in parallel to 3 in series and 4 in parallel, 12 input conductors 21 are used. In other words, in the case of 3 in series and 4 in parallel, the number of input conductors 21 used is doubled compared to the case of 2 in series and 2 in parallel.

[0050] FIG. 22 is a plan view showing a state in which only the input conductor 21 is attached to the annular member 12 in the first embodiment. In the following description, the twelve input conductors 21 are distinguished by different reference numerals 21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h, 21i, 21j, 21k, and 21l, and the round terminals 31 included in each input conductor 21 are distinguished by different reference numerals 31a, 31b, 31c, 31d, 31e, 31f, 31g, 31h, 31i, 31j, 31k, and 31l. However, when there is no need to distinguish between the twelve input conductors 21a to 21l, they will be collectively referred to as input conductors 21, and when there is no need to distinguish between the twelve round terminals 31a to 31l, they will be collectively referred to as round terminals 31.

[0051] 22, the twelve input conductors 21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h, 21i, 21j, 21k, and 21l are arranged in the fourth wiring groove 22. The round terminals 31a, 31b, 31c, 31d, 31e, 31f, 31g, 31h, 31i, 31j, 31k, and 31l of the input conductors 21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h, 21i, 21j, 21k, and 21l are arranged concentrically with the corresponding terminal connection holes 16. The twelve round terminals 31a to 31l are arranged in order in the circumferential direction of the annular member 12, from round terminal 31a to round terminal 31l, in the clockwise direction in FIG.

[0052] The state in which only the coil end connecting conductors 13a, 13b are attached to the annular member 12 is the same as the 6 series 2 parallel case (FIG. 13), and therefore a description thereof will be omitted.

[0053] FIG. 23 is a plan view showing the configuration of the connection board 26 in the case of a 3-in-series, 4-in-parallel configuration. 23, the wiring plate 26 is formed by attaching the connecting conductors (coil terminal connecting conductors 13a, 13b, neutral point connecting conductor 32) and the input conductor 21 to the annular member 12 as described above. A bolt 27 is attached to each of the multiple terminal connecting holes 16 (FIGS. 7 and 8) provided in the annular member 12. The bolts 27 are fastened with the male threads of the bolts 27 engaged with the terminal connecting holes 16, which are screw holes.

[0054] At the P1 position, the bolt 27 fastens the terminal of the coil end connecting conductor 13a and the terminal of the neutral point connecting conductor 32 together in the terminal connecting hole 16. At the P3 position, the bolt 27 fastens the terminal of the coil end connecting conductor 13b and the terminal of the input conductor 21 together in the terminal connecting hole 16.

[0055] More specifically, at the P1 position, the round terminals 33a, 33b, 33c, 33d, 33e, 33f, 33g, 33h, 33i, 33j, 33k, and 33l of the neutral point connecting conductor 32 and the corresponding round terminals 15a of the coil end connecting conductor 13a are fastened together by the bolts 27. At the P3 position, the round terminals 31 (31a, 31b, 31c, 31d, 31e, 31f, 31g, 31h, 31i, 31j, 31k, and 31l) of the input conductors 21 (21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h, 21i, 21j, 21k, and 21l) and the corresponding round terminals 15b of the coil end connecting conductor 13b are fastened together by the bolts 27.

[0056] By electrically connecting the plurality of coils 6 using the connection plate 26 in this way, the electric circuit of the motor 100 has a 3-in-series, 4-in-parallel configuration as shown in FIG. As can be seen from FIG. 24, motor 100 is a three-phase motor including a U-phase coil, a V-phase coil, and a W-phase coil, with each phase consisting of 12 coils 6. An AC voltage is applied to each phase coil via a corresponding input conductor 21. The coils of each phase are also connected by a neutral point-connecting conductor 32. As shown in FIG. 4 above, the 12 coils 6 belonging to the U-phase coil are connected in series with three coils 6 as one set, and these three series-connected coils 6 are then connected in parallel. In other words, the U-phase coil has a three-in-series, four-in-parallel configuration. This is also true for the V-phase coil and the W-phase coil.

[0057] When switching the electrical circuit of the motor 100 from 3 in series and 4 in parallel to 6 in series and 2 in parallel, the neutral point connecting conductor 17 shown in FIG. 10 is used instead of the neutral point connecting conductor 32 shown in FIG. 20, the coil-to-coil connecting conductor 19 is placed in the third wiring groove 20 of the annular member 12, and the number of input conductors 21 used is reduced from 12 to 6.

[0058] As described above, in the motor 100 according to the first embodiment, the annular member 12, which is a main component of the connection plate 26, and the coil end connecting conductors 13a and 13b are used together, allowing the electrical circuit configuration to be switched from 6 series / 2 parallel to 3 series / 4 parallel, or from 3 series / 4 parallel to 6 series / 2 parallel. Switching the electrical circuit allows the number of coils connected in parallel to be changed. In the first embodiment, the terminals of the connecting conductors (coil end connecting conductors 13a and 13b, neutral point connecting conductors 17 and 32, and inter-coil connecting conductor 19) and the terminal of the input conductor 21 are fastened together to the terminal connection holes 16. This allows the number of parallel connections of the electrical circuit to be changed without requiring complex manual wiring work or a dedicated connection plate.

[0059] In the first embodiment, the terminals of the connecting conductors (coil terminal connecting conductors 13a, 13b, neutral point connecting conductors 17, 32, and inter-coil connecting conductor 19) and the terminals of the input conductor 21 are fastened together by bolts 27. This allows for easy attachment and detachment of the connecting conductors (coil terminal connecting conductors 13a, 13b, neutral point connecting conductor 17, and inter-coil connecting conductor 19) and the input conductor 21.

[0060] Furthermore, in the first embodiment, the heat crimping terminals 23a, 23b of the coil end connecting conductors 13a, 13b are joined to the terminals 9 of the coil 6 by heat crimping. This allows the terminals 9 of the coil 6 and the coil end connecting conductors 13a, 13b to be electrically connected without removing the insulating coating from the terminals 9 of the coil 6. Furthermore, by eliminating the process of removing the insulating coating, the coating stripping device and process can be eliminated, enabling motor production to be achieved at low cost and in a short time.

[0061] In the first embodiment, the terminals of the connecting conductors (coil end connecting conductors 13a, 13b, neutral point connecting conductors 17, 32, and inter-coil connecting conductor 19) and the terminal of the input conductor 21 are each configured as round terminals. Therefore, when fastening the terminals together with bolts 27, by inserting bolts 27 into the holes of each terminal, the terminals can be fastened together while suppressing misalignment of the terminals.

[0062] In addition, in the first embodiment, the coil-to-coil connection conductor 19 is composed of an insulated cable 24 and round terminals 30a, 30b, so that the terminal connection hole 16 of the annular member 12 and the round terminals 30a, 30b of the coil-to-coil connection conductor 19 can be easily aligned.

[0063] Second Embodiment FIG. 25 is an enlarged perspective view of a main part of the motor according to the second embodiment. The motor according to the second embodiment differs from the motor according to the first embodiment in the joint structure between the terminal 9 of the coil 6 and the coil terminal connection conductors 13a, 13b. The coil 6 is preferably made of a rectangular enameled wire, which allows for easy alignment and butting of the terminals 25a, 25b of the coil terminal connection conductors 13a, 13b to the terminal 9 of the coil 6. Note that using a rectangular enameled wire to form the coil 6 makes it difficult to connect and wind multiple coils 6. For this reason, in FIG. 25 , each coil 6 is wound independently, and the terminals of three circumferentially adjacent coils are welded together at two locations. The terminal 9 of the coil 6 is bent upward. In contrast, the terminal 25a of the coil terminal connection conductor 13a is bent upward like the terminal 9 of the coil 6, and the terminal 26b of the coil terminal connection conductor 13b is also bent upward like the terminal 9 of the coil 6. Terminal 25a of coil end connection conductor 13a is joined to corresponding terminal 9 of coil 6 by welding. Terminal 25a and terminal 9 are joined by, for example, TIG welding, laser welding, etc. Similarly, terminal 25b of coil end connection conductor 13b and corresponding terminal 9 of coil 6 are also joined by welding.

[0064] As described above, in the second embodiment, the terminals 25a, 25b of the coil end connecting conductors 13a, 13b are joined by welding to the terminal 9 of the coil 6. This ensures reliable electrical connection between the terminal 9 of the coil 6 and the coil end connecting conductors 13a, 13b when the coil 6 is made of a rectangular enameled wire. As a joining method other than welding, for example, ultrasonic joining may be used.

[0065] <Third embodiment> FIG. 26 is a plan view showing the configuration of the annular member in the third embodiment. As shown in FIG. 26, the annular member 12 is basically similar in configuration to that of the first embodiment (FIG. 8). Specifically, a plurality of first wiring grooves 14, a plurality of terminal connection holes 16, a second wiring groove 18, a third wiring groove 20, and a fourth wiring groove 22 are formed on the upper surface side of the annular member 12. The first wiring groove 14 is formed in an L-shape in plan view on the outermost periphery of the annular member 12. The terminal connection holes 16 are formed in a circular shape in plan view on the outermost periphery of the annular member 12. The second wiring groove 18, the third wiring groove 20, and the fourth wiring groove 22 are formed concentrically. In addition, a partition portion 42 is provided between the third wiring groove 20 and the fourth wiring groove 22.

[0066] FIG. 27 is a plan view showing a state in which only the coil end connecting conductors 13a and 13b are attached to the annular member 12 in the third embodiment. As shown in FIG. 27 , a total of 24 coil terminal connection conductors 13a, 13b are attached to the annular member 12. The coil terminal connection conductors 13a, 13b are arranged in the corresponding first wiring grooves 14. The round terminals 15a of the coil terminal connection conductors 13a are arranged concentrically with the terminal connection holes 16, and the heat crimping terminals 23a of the coil terminal connection conductors 13a are arranged to protrude in the circumferential direction of the annular member 12. Similarly, the round terminals 15b of the coil terminal connection conductors 13b are arranged concentrically with the terminal connection holes 16, and the heat crimping terminals 23b of the coil terminal connection conductors 13b are arranged to protrude in the circumferential direction of the annular member 12. The heat crimping terminals 23a, 23b of the coil terminal connection conductors 13a, 13b that are adjacent in the circumferential direction of the annular member 12 are arranged to face each other.

[0067] FIG. 28 is a perspective view showing the configuration of a coil-to-coil connecting conductor 29 in the third embodiment. As shown in FIG. 28 , the coil-to-coil connection conductor 29 is an alternative to the coil-to-coil connection conductor 19 used in the first embodiment, and is formed in an arc shape. The coil-to-coil connection conductor 29 is formed as a single piece of metal molding. A round terminal 34a is formed at one end of the coil-to-coil connection conductor 29, and a round terminal 34b is formed at the other end of the coil-to-coil connection conductor 29. The coil-to-coil connection conductor 29 is obtained by shaping a conductive plate made of copper or the like by press working (punching and bending). The surface of the coil-to-coil connection conductor 29 is covered with an insulating coating such as resin, except for the portions of the round terminals 34a and 34b.

[0068] 29 is a plan view showing a state in which only the coil-to-coil connection conductors 29 are attached to the annular member 12 in the third embodiment. When the motor's electric circuit has a 6-in-series, 2-in-parallel configuration, six coil-to-coil connection conductors 29 are used. In the following description, the six coil-to-coil connection conductors 29 are distinguished by different reference numerals 29a, 29b, 29c, 29d, 29e, and 29f. However, when there is no need to distinguish between the six coil-to-coil connection conductors 29a to 29f, they will be collectively referred to as coil-to-coil connection conductors 29.

[0069] As shown in FIG. 29 , six inter-coil connection conductors 29a, 29b, 29c, 29d, 29e, and 29f are arranged in the third wiring groove 20. As described below, the six inter-coil connection conductors 29a, 29b, 29c, 29d, 29e, and 29f are arranged in the same manner as the six inter-coil connection conductors 19a, 19b, 19c, 19d, 19e, and 19f in the first embodiment. The inter-coil connection conductors 29a, 29b, and 29c and the inter-coil connection conductors 29d, 29e, and 29f are arranged at different positions in the circumferential direction of the annular member 12. Specifically, the inter-coil connection conductor 29a and the inter-coil connection conductor 29d are arranged 180° apart in the circumferential direction of the annular member 12. Similarly, the coil-to-coil connection conductor 29b and the coil-to-coil connection conductor 29e are arranged 180° apart in the circumferential direction of the annular member 12, and the coil-to-coil connection conductor 29c and the coil-to-coil connection conductor 29f are also arranged 180° apart in the circumferential direction of the annular member 12.

[0070] Furthermore, the inter-coil connection conductors 29a, 29b, and 29c are arranged so as to partially overlap one another in the circumferential direction of the annular member 12, and the inter-coil connection conductors 29d, 29e, and 29f are also arranged so as to partially overlap one another in the circumferential direction of the annular member 12. The round terminals 34a of each of the inter-coil connection conductors 29a, 29b, 29c, 29d, 29e, and 29f are arranged concentrically with the corresponding terminal connection holes 16, and the round terminals 34b of each of the inter-coil connection conductors 29a, 29b, 29c, 29d, 29e, and 29f are also arranged concentrically with the corresponding terminal connection holes 16.

[0071] In the circumferential direction of the annular member 12, the round terminal 34a of the inter-coil connection conductor 29a and the round terminal 34b of the inter-coil connection conductor 29c are arranged adjacent to each other, and the round terminal 34a of the inter-coil connection conductor 29d and the round terminal 34b of the inter-coil connection conductor 29f are arranged adjacent to each other. In addition, in the circumferential direction of the annular member 12, the round terminal 34b of the inter-coil connection conductor 29a and the round terminal 34b of the inter-coil connection conductor 29b are arranged adjacent to each other, and the round terminal 34a of the inter-coil connection conductor 29b and the round terminal 34a of the inter-coil connection conductor 29c are arranged adjacent to each other. Furthermore, in the circumferential direction of the annular member 12, the round terminal 34b of the inter-coil connection conductor 29d and the round terminal 34b of the inter-coil connection conductor 29e are arranged adjacent to each other, and the round terminal 34a of the inter-coil connection conductor 29e and the round terminal 34a of the inter-coil connection conductor 29f are arranged adjacent to each other. Furthermore, in the circumferential direction of the annular member 12, the round terminal 34b of the inter-coil connection conductor 29a and the round terminal 34a of the inter-coil connection conductor 29f are arranged adjacent to each other, and the round terminal 34a of the inter-coil connection conductor 29c and the round terminal 34b of the inter-coil connection conductor 29d are arranged adjacent to each other.

[0072] 30 is a plan view showing a state in which only the neutral point connecting conductor 17 is attached to the annular member 12 in the third embodiment. The configuration of the neutral point connecting conductor 17 is the same as that in the first embodiment (FIG. 10). 30, the neutral point connecting conductor 17 is disposed in the second wiring groove 18. Six round terminals 28a, 28b, 28c, 28d, 28e, and 28f of the neutral point connecting conductor 17 are disposed concentrically with the corresponding terminal connection holes 16.

[0073] 31 is a plan view showing a state in which only the input conductor 21 is attached to the annular member 12 in the third embodiment. The configuration of the input conductor 21 is the same as that in the first embodiment (FIG. 12). When the motor's electric circuit has a six-in-series, two-in-parallel configuration, six input conductors 21 are used. In the following description, the six input conductors 21 are distinguished by different reference numerals 21a, 21b, 21c, 21d, 21e, and 21f, and the round terminals 31 of each input conductor 21 are distinguished by different reference numerals 31a, 31b, 31c, 31d, 31e, and 31f. However, when there is no need to distinguish between the six input conductors 21a to 21f, they will be collectively referred to as input conductors 21, and when there is no need to distinguish between the six round terminals 31a to 31f, they will be collectively referred to as round terminals 31.

[0074] 31 , the six input conductors 21a, 21b, 21c, 21d, 21e, and 21f are arranged in the fourth wiring groove 22. The input conductors 21a, 21b, and 21c and the input conductors 21d, 21e, and 21f are arranged at different positions in the circumferential direction of the annular member 12. The input conductors 21a, 21b, and 21c are arranged so as to partially overlap each other in the circumferential direction of the annular member 12, and the input conductors 21d, 21e, and 21f are also arranged so as to partially overlap each other in the circumferential direction of the annular member 12. The round terminals 31a, 31b, 31c, 31d, 31e, and 31f of the input conductors 21a, 21b, 21c, 21d, 21e, and 21f are arranged concentrically with the corresponding terminal connection holes 16.

[0075] In the circumferential direction of the annular member 12, the round terminal 31a of the input conductor 21a and the round terminal 31b of the input conductor 21b are arranged adjacent to each other, and the round terminal 31b of the input conductor 21b and the round terminal 31c of the input conductor 21c are arranged adjacent to each other. In addition, in the circumferential direction of the annular member 12, the round terminal 31d of the input conductor 21d and the round terminal 31e of the input conductor 21e are arranged adjacent to each other, and the round terminal 31e of the input conductor 21e and the round terminal 31f of the input conductor 21f are arranged adjacent to each other.

[0076] FIG. 32 is a plan view showing the configuration of the connection board 26 in the case of 6 series and 2 parallel in the third embodiment. As shown in Fig. 32, connection plate 26 is formed by attaching connecting conductors (coil terminal connecting conductors 13a, 13b, neutral point connecting conductor 17, inter-coil connecting conductor 29) and input conductor 21 to annular member 12 as described above. Bolts 27 are attached to each of a plurality of terminal connecting holes 16 (Figs. 7 and 8) provided in annular member 12. Bolts 27 are fastened with their male threads engaged with terminal connecting holes 16, which are screw holes.

[0077] At the P1 position, bolt 27 secures the terminal of coil end connection conductor 13a and the terminal of neutral point connection conductor 17 by co-tightening to terminal connection hole 16. At the P2 position, bolt 27 secures the terminals of coil end connection conductors 13a and 13b and the terminal of inter-coil connection conductor 29 by co-tightening to terminal connection hole 16, and at the P3 position, bolt 27 secures the terminal of coil end connection conductor 13b and the terminal of input conductor 21 by co-tightening to terminal connection hole 16.

[0078] More specifically, at the P1 position, the round terminals 28a, 28b, 28c, 28d, 28e, and 28f of the neutral point connecting conductor 17 and the corresponding round terminal 15a of the coil end connecting conductor 13a are fastened together by the bolt 27. At the P2 position, the round terminal 15a of the coil end connecting conductor 13a and the round terminal 34b of the inter-coil connecting conductor 29 are fastened together by the bolt 27, and the round terminal 15b of the coil end connecting conductor 13b and the round terminal 34a of the inter-coil connecting conductor 29 are also fastened together by the bolt 27. Also, at the P3 position, the round terminals 31 (31a, 31b, 31c, 31d, 31e, 31f) of the input conductors 21 (21a, 21b, 21c, 21d, 21e, 21f) and the corresponding round terminals 15b of the coil terminal connection conductor 13b are fastened together by bolts 27.

[0079] The connection plate 26 having the above configuration is mounted on the stator housing 10 shown in FIG. 1. The terminals 9 of the coils 6 are joined by fusing (heat crimping) to the heat crimping terminals 23a, 23b of the coil end connection conductors 13a, 13b, respectively. By electrically connecting the multiple coils 6 using the connection plate 26 in this manner, the electric circuit of the motor 100 has a 6-series, 2-parallel configuration as shown in FIG. 19. When the electric circuit of the motor 100 is switched from a 6-series, 2-parallel configuration to a 3-series, 4-parallel configuration, the neutral point connection conductor 32 is used instead of the neutral point connection conductor 17, as in the first embodiment, and the number of input conductors 21 used is increased from 6 to 12, with the inter-coil connection conductor 29 not being used.

[0080] In the third embodiment, the coil-to-coil connecting conductor 29 is formed by an integrally molded metal product, and therefore the coil-to-coil connecting conductor 29 can be mass-produced by press molding and manufactured inexpensively.

[0081] <Fourth embodiment> The fourth embodiment differs from the first embodiment in the structure of the terminal connection hole 16 of the annular member 12 and the structure for fastening the terminals together in the terminal connection hole 16. A specific example will be described below. FIG. 33 is an enlarged cross-sectional view of a main part of a motor according to a fourth embodiment. In FIG. 33 , the terminal connection hole 16 of the annular member 12 is a through-hole. The round terminals 15a and 28a are arranged overlapping each other in the terminal connection hole 16, with the round terminal 15a of the coil end-connecting conductor 13a on the lower side and the round terminal 28a of the neutral point-connecting conductor 17 on the upper side. The male threads of the bolts 27 are inserted into the round terminals 15a and 28a. The male threads of the bolts 27 are engaged with nuts 35. The nut 35 may be formed integrally with the annular member 12 by insert molding or the like, or may be formed separately from the annular member 12. The round terminals 15a and 28a are fastened together by the bolts 27 and the nuts 35. This allows the round terminals 15a and 28a to be fastened together more firmly. The terminal co-fastening structure using bolt 27 and nut 35 is also applied to positions P1, P2, P3, and P4 shown in Fig. 17. This allows for easy attachment and detachment of the connection conductors (coil terminal connection conductors 13a, 13b, neutral point connection conductors 17, 32, and inter-coil connection conductor 19) and input conductor 21.

[0082] Fifth Embodiment The fifth embodiment differs from the first embodiment in the structure of the terminal connection hole 16 of the annular member 12 and the structure for fastening the terminals together in the terminal connection hole 16. A specific example will be described below. FIG. 34 is an enlarged cross-sectional view of a main part of a motor according to a fifth embodiment. In FIG. 34, the terminal connection hole 16 of the annular member 12 is a through hole. The round terminals 15a and 28a are arranged overlapping each other in the terminal connection hole 16, with the round terminal 15a of the coil end connection conductor 13a on the lower side and the round terminal 28a of the neutral point connection conductor 17 on the upper side. The shank of a rivet 36 is inserted into the round terminals 15a and 28a. The round terminals 15a and 28a are fastened together by the rivet 36. This allows the round terminals 15a and 28a to be fastened together more firmly. The terminal fastening structure using the rivet 36 is also applicable to positions P1, P2, P3, and P4 shown in FIG. 17.

[0083] <Modifications, etc.> 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 facilitate understanding of the present invention, but the present invention is not necessarily limited to those including all of the configurations described in the above-described embodiments. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment. It is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to delete part of the configuration of each embodiment, add other configurations, or replace it with other configurations.

[0084] In addition, in the above embodiment, the case where the terminals of the connection terminals and the terminals of the input terminals are both round terminals has been described as an example, but the terminals are not limited to round terminals, and may be any shape that can be used for co-fastening, such as U-shaped terminals or quad-shaped terminals.

[0085] Furthermore, in the above embodiment, an outer rotor type split core concentrated winding motor has been described, but the same effect can also be obtained with an inner rotor type split core concentrated winding motor.

[0086] Furthermore, the motor's electric circuit has been described as having 36 magnetic poles, 6 in series, 2 in parallel, and 3 in series, 4 in parallel, but the combination of the number of magnetic poles and the number of parallel connections is not limited to this. [Explanation of symbols]

[0087] 4...Split core, 6...Coil, 9...Terminal, 12...Annular member, 13a, 13b...Conductor for connecting coil terminals, 14...First wiring groove, 15a, 15b...Round terminal (terminal), 16...Terminal connection hole, 17...Conductor for connecting neutral point, 18...Second wiring groove, 19...Conductor for connecting coils, 20...Third wiring groove, 21...Input conductor, 22...Fourth wiring groove, 24...Insulated cable, 27...Bolt, 28...Round terminal (terminal), 29...Conductor for connecting coils, 30a, 30b...Round terminal (terminal), 31...Round terminal (terminal), 32...Conductor for connecting neutral point, 33...Round terminal (terminal), 34a, 34b...Round terminal (terminal), 35...Nut, 36...Rivet, 100...Motor

Claims

1. a plurality of divided cores arranged in a circumferential direction; a plurality of coils wound around the plurality of split cores, respectively; an annular member having a plurality of wiring grooves and a plurality of terminal connection holes formed therein; a plurality of connection conductors and a plurality of input conductors disposed in the wiring groove; Equipped with a motor having an electric circuit electrically connecting the plurality of coils, the plurality of connecting conductors, and the plurality of input conductors, The plurality of connection conductors and the plurality of input conductors each have a terminal, and the terminals of both the connection conductors and the input conductors are fastened together to the terminal connection holes. Motor.

2. The terminals are fastened together by a bolt. The motor according to claim 1 .

3. The terminals are fastened together with bolts and nuts. The motor according to claim 1 .

4. The terminals are fastened together by rivets The motor according to claim 1 .

5. The terminal is a round terminal. The motor according to claim 1 .

6. the connecting conductors include inter-coil connecting conductors, The inter-coil connecting conductor is composed of an insulated cable and terminals connected to both ends of the insulated cable. The motor according to claim 1 .

7. the connecting conductors include inter-coil connecting conductors, The conductor for connecting the coils is made of a single piece of metal. The motor according to claim 1 .

8. The coil is made of rectangular enameled wire. The motor according to claim 1 .

9. The coil is made of enameled wire with a round cross section. The motor according to claim 1 .

10. The connecting conductor includes a coil terminal connecting conductor joined to the terminal of the coil by heat crimping or welding. The motor according to claim 1 .

Images