electric motor

Abstract

The present application provides an electric motor which can cope with a change in the number of parallel circuits without complicated wiring work and a dedicated wiring board. The electric motor of the present application includes: a plurality of divided cores; a plurality of coils wound around the plurality of divided cores; a ring-shaped member formed with a plurality of wiring grooves and a plurality of terminal connection holes; a plurality of connection conductors and a plurality of input conductors disposed in the wiring grooves; and a circuit electrically connecting the plurality of coils, the plurality of connection conductors, and the plurality of input conductors, the plurality of connection conductors and the plurality of input conductors each having a terminal, and the terminals being fixed to the terminal connection holes by common fastening.

Description

Technical Field

[0001] This invention relates to electric motors. Background Technology

[0002] To combat global warming, the development of technologies to reduce carbon dioxide emissions is essential. Therefore, there are high expectations for the efficiency and output of electric motors. Electric motors consume approximately 70% of the electricity used in industry and 40% in households. Therefore, even increasing the efficiency of each electric motor by just a few percent could be expected to provide energy savings equivalent to a power plant with hundreds of thousands of kW, potentially helping to reduce millions of tons of carbon dioxide emissions annually. On the other hand, in recent years, the widespread adoption of electric vehicles, also aimed at reducing carbon dioxide emissions, has significantly increased the demand for miniaturization and high output of electric motors to replace internal combustion engines.

[0003] Among existing electric motors, those employing a structure in which the stator core is divided in the circumferential direction are known (see, for example, Patent Document 1). In such motors, a single 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, the output of the motor will change if the number of parallel circuits in the circuit including the coil (motor circuit) is changed. That is, by changing the number of parallel circuits, motors with different outputs can be obtained.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2008-259259 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] Generally, when the number of coils connected in series is M, and the number of M coils connected in parallel (hereinafter referred to as the "parallel connection number") is N, the electric motor circuit has a structure of M series and N parallel. For such an electric motor circuit, there is a need to change the parallel connection number (the values ​​of N and M). To give a specific example, for the traction machine of an elevator driven by an electric motor, there is a need to change the parallel connection number of the circuit in order to switch the output performance of the electric motor in accordance with the capacity of the traction machine.

[0009] The number of parallel circuits can be changed by the operator manually peeling off the coating from the ends of each coil and crimping the coated cable to the coil ends using connecting terminals, and then connecting the two ends of the cable to where they are connected. However, this method requires tedious wiring work, such as changing the connection positions of the coil ends and the cables or changing the cable configuration, according to the number of parallel circuits. Alternatively, a wiring board with connecting conductors assembled on a resin component can be considered, but this method requires a dedicated wiring board corresponding to the number of parallel circuits.

[0010] The present invention was developed to solve the above-mentioned problems, and its purpose is to provide an electric motor that can cope with changes in the number of parallel circuits without the need for cumbersome manual wiring operations or special wiring boards.

[0011] Technical solutions for solving the problem

[0012] To address the aforementioned issues, for example, one could adopt the structure described in the claimed scope of rights.

[0013] This application includes various technical solutions to address the aforementioned problems. One example is an electric motor comprising: a plurality of segmented cores arranged in a circumferential direction; a plurality of coils wound around the plurality of segmented cores; an annular component having a plurality of wiring slots and a plurality of terminal connection holes; a plurality of connecting conductors and a plurality of input conductors disposed in the wiring slots; and a circuit electrically connecting the plurality of coils, the plurality of connecting conductors, and the plurality of input conductors. Each of the plurality of connecting conductors and the plurality of input conductors has a terminal, and the terminals are fixed to the terminal connection holes by common fastening.

[0014] Invention Effects

[0015] According to the present invention, changes in the number of parallel circuits can be handled without the need for tedious manual wiring operations and dedicated wiring boards.

[0016] Other issues, structures, and effects not described above will be explained through the following description of the implementation methods. Attached Figure Description

[0017] Figure 1 This is a schematic cross-sectional view showing the structure of the electric motor according to the first embodiment.

[0018] Figure 2 It is a three-dimensional diagram showing the structure of the segmented core.

[0019] Figure 3 It is a three-dimensional diagram showing the state of a coil wound on a segmented core.

[0020] Figure 4This is a three-dimensional diagram illustrating an example of how a coil is wound.

[0021] Figure 5 This is a perspective view showing the structure of the stator in the first embodiment.

[0022] Figure 6 This is a perspective view showing the state in the electric motor of the first embodiment where a junction plate is assembled on the stator.

[0023] Figure 7 This is a perspective view showing the structure of the annular component in the first embodiment.

[0024] Figure 8 yes Figure 7 The plan view of the ring-shaped component shown.

[0025] Figure 9 This is a perspective view showing the structure of the conductor for connecting the coil terminals in the first embodiment.

[0026] Figure 10 This is a perspective view showing the structure of the conductor for neutral point connection in the first embodiment.

[0027] Figure 11 This is a perspective view showing the structure of the conductor used for connecting coils in the first embodiment.

[0028] Figure 12 This is a perspective view showing the structure of the input conductor in the first embodiment.

[0029] Figure 13 This is a plan view showing the state in the first embodiment where only the conductor for connecting the coil terminal is installed on the annular component.

[0030] Figure 14 This is a plan view showing the state in the first embodiment where only a conductor for neutral point connection is installed on the annular component.

[0031] Figure 15 This is a plan view showing the state in the first embodiment where only the conductor for connecting the coils is installed on the annular component.

[0032] Figure 16 This is a plan view showing the state in the first embodiment where only the input conductor is installed on the annular component.

[0033] Figure 17 This is a plan view showing the structure of the junction plate with 6 series and 2 parallel connections.

[0034] Figure 18 It is a three-dimensional diagram showing the state in which coil terminals are connected to each other by a conductor through thermal riveting.

[0035] Figure 19 This is a circuit diagram showing a motor with 6 motors connected in series and 2 motors connected in parallel.

[0036] Figure 20 It is a three-dimensional diagram showing the structure of the conductor used for neutral point connection when the circuit of the electric motor is in the case of 3 series and 4 parallel connections.

[0037] Figure 21 This is a plan view showing the state in the first embodiment where only a conductor for neutral point connection is installed on the annular component.

[0038] Figure 22 This is a plan view showing the state in the first embodiment where only the input conductor is installed on the annular component.

[0039] Figure 23 This is a plan view showing the structure of the junction plate in the case of 3 series and 4 parallel connections.

[0040] Figure 24 This is a circuit diagram showing a motor with 3 motors connected in series and 4 motors connected in parallel.

[0041] Figure 25 This is a perspective view showing an enlarged view of the main part of the electric motor in the second embodiment.

[0042] Figure 26 This is a plan view showing the structure of the annular component in the third embodiment.

[0043] Figure 27 This is a plan view showing the state in the third embodiment where only the coil terminal connection conductor is installed on the annular component.

[0044] Figure 28 This is a perspective view showing the structure of the conductor used for connecting coils in the third embodiment.

[0045] Figure 29 This is a plan view showing the state in the third embodiment where only the conductor for connecting the coils is installed on the annular component.

[0046] Figure 30 This is a plan view showing the state in the third embodiment where only a conductor for neutral point connection is installed on the annular component.

[0047] Figure 31 This is a plan view showing the state in the third embodiment where only the input conductor is installed on the annular component.

[0048] Figure 32 This is a plan view showing the structure of the wiring board in the case of 6 series and 2 parallel connections in the third embodiment.

[0049] Figure 33This is an enlarged cross-sectional view of the main part of the electric motor in the fourth embodiment.

[0050] Figure 34 This is an enlarged cross-sectional view of the main part of the electric motor in the fifth embodiment. Detailed Implementation

[0051] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and drawings, elements that have substantially the same function or structure are given the same reference numerals, and repeated descriptions are omitted.

[0052] <First Implementation>

[0053] Figure 1 This is a schematic cross-sectional view showing the structure of the electric motor according to the first embodiment.

[0054] like Figure 1 As shown, the electric motor 100 includes a stator 1, a rotor 3, a stator housing 10, and a wiring plate 26. The stator 1 has a segmented core 4 (see reference). Figure 2 The rotor 3 has a permanent magnet 2 and a coil 6. The motor 100 is a so-called external rotor type motor with a portion of the rotor 3 arranged radially outside the stator 1 when viewed from the rotation center axis J of the motor 100. In addition, the motor 100 is a so-called concentrated winding motor in which the coil 6 is wound around each segmented core 4.

[0055] The rotor 3 is cylindrical. The rotor 3 is rotatably supported on the outer periphery of the stator 1 by bearings (not shown). Multiple permanent magnets 2 are attached to the inner circumferential surface of the rotor 3. In this embodiment, as an example, the case where the number of magnetic poles of the motor 100 is 36 will be described.

[0056] Figure 2 It is a three-dimensional diagram showing the structure of the segmented core.

[0057] like Figure 2 As shown, the segmented core 4 integrally comprises a toothed portion 4a and a connecting portion 4b. The segmented core 4 is, for example, constructed by punching, riveting, welding, or bonding a predetermined number of layers of electromagnetic steel sheet with a thickness of 0.1 mm to 0.5 mm. An insulating coating is applied to the surface of the electromagnetic steel sheet to prevent it from conducting electricity. The toothed portion 4a is the part used to wind the coil 6. The connecting portion 4b is the part used to connect the segmented cores 4 together.

[0058] In the connecting portion 4b, a protrusion 4c, a groove 4d, and a through hole 4e are formed. The protrusion 4c and the groove 4d are formed along the thickness direction of the segmented core 4. The through hole 4e is formed so as to penetrate the segmented core 4 in the thickness direction. The core of the stator 1 is constructed by arranging multiple segmented cores 4 in the circumferential direction. At this time, two adjacent segmented cores 4 in the circumferential direction are connected to each other by fitting the protrusion 4c of one segmented core 4 with the groove 4d of the other segmented core 4.

[0059] Additionally, on the segmented core 4, such as Figure 3 As shown, a winding frame 5 made of insulating material is assembled. In the toothed portion 4a of the segmented core 4 ( Figure 2 A coil 6 is wound around a winding frame 5, thereby forming a magnetic pole 7. As the insulating material constituting the winding frame 5, resins such as PBT (polybutylene terephthalate), PPS (polyphenylene sulfide), and LCP (liquid crystal polymer) can be used.

[0060] The coil 6 is made of flat enameled wire or enameled wire with a circular cross-section. When the coil 6 is made of flat enameled wire, the conductor density (area ratio) in the slots formed between adjacent segmented cores 4 in the circumferential direction can be increased. In addition, when the coil 6 is made of enameled wire with a circular cross-section, the terminal 9 of the coil 6 can be easily positioned by bending because the circular cross-section enameled wire is easy to bend in any direction.

[0061] The terminal 9 of coil 6 is formed by removing the insulation coating of the enameled wire. When coil 6 is constructed with flat enameled wire, a grinder or mold (not shown) can be used to remove the insulation coating. Alternatively, when coil 6 is constructed with round-section enameled wire, a rotary cutter (not shown) can be used to remove the insulation coating. Then, in either case, the terminal 9 of coil 6 can be connected to its corresponding connecting conductor (described later) using a prescribed joining method.

[0062] Figure 4 This is a three-dimensional diagram of an example of a coil winding method.

[0063] like Figure 4 As shown, coil 6 is continuously wound on three adjacent segmented cores 4. In other words, a predetermined number of turns of enameled wire constituting coil 6 is wound on each of the three segmented cores 4. That is, the three coils 6, corresponding one-to-one with the three segmented cores 4, are composed of one enameled wire. Then, one end 9 of coil 6 is... Figure 4 The split core 4 on the left side is arranged to protrude upwards, and the other end 9 of the coil 6 is... Figure 4The coil 6 is arranged protruding upwards on the right-side segmented core 4. By winding the coil 6 in this way, the three coils 6 are connected in series in the circuit of the motor 100.

[0064] Figure 5 This is a perspective view showing the structure of the stator in the first embodiment.

[0065] Figure 5 In this embodiment, the stator 1 is constructed by assembling multiple (36 in this example) magnetic poles 7 into a ring shape. Each magnetic pole 7 is composed of a combination of a segmented core 4 and a coil 6. Therefore, 36 segmented cores 4 are arranged in the circumferential direction of the stator 1. The 36 segmented cores 4 are assembled into a ring shape by fitting the aforementioned protrusions 4c and grooves 4d. Furthermore, each segmented core 4 is fixed by tightening multiple bolts 11 while being clamped by a pair of upper and lower ring members 8a and 8b. The external thread of the bolts 11 is inserted into the through holes 4e provided in the segmented core 4. Figure 2 Additionally, the external thread of bolt 11 engages with the internal thread (not shown) provided in ring component 8b.

[0066] Figure 6 This is a perspective view showing the state in the electric motor of the first embodiment where a junction plate is assembled on the stator.

[0067] The junction plate 26 consists of a ring-shaped component 12 made of insulating material. Figure 7 It consists of a plurality of connecting conductors and a plurality of input conductors installed on the annular component 12. The connecting conductors and input conductors will be described in detail below.

[0068] The annular component 12 is made of resins such as PBT (polybutylene terephthalate), PPS (polyphenylene sulfide), and LCP (liquid crystal polymer). However, in addition to using an insulating material to form the entire annular component 12, the shape of the annular component 12 can also be formed using a conductor, and insulation from the connecting conductor and the input conductor can be ensured by applying an insulating coating to the surface of the conductor. The constituent elements of the junction plate 26 will be described in detail below.

[0069] Figure 7 This is a perspective view showing the structure of the annular component in the first embodiment. Figure 8 yes Figure 7 The plan view of the ring-shaped component shown.

[0070] like Figure 7As shown, on one side of the top surface of the annular component 12, 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 other hand, a plurality of recesses 40 are formed on one side of the bottom surface of the annular component 12. The recesses 40 are to prevent bolts 11 ( Figure 5 It is formed by interference with the annular component 12.

[0071] The first wiring slot 14 is formed in an L-shape in the plan view. A plurality of first wiring slots 14 are formed on the outermost periphery of the annular member 12. In addition, the plurality of first wiring slots 14 are formed in such a way that two adjacent first wiring slots 14 in the circumferential direction of the annular member 12 form a pair.

[0072] The terminal connection hole 16 is circular in plan view. The terminal connection hole 16 is formed at the outermost periphery of the annular member 12. Additionally, the terminal connection hole 16 is formed in a recess 41 that is coplanar with the bottom surface of the first wiring groove 14. The recess 41 is triangular (mountain-shaped) in plan view. In this embodiment, the terminal connection hole 16 is a screw hole.

[0073] The second wiring slot 18, the third wiring slot 20, and the fourth wiring slot 22 are formed in a concentric circle shape. The second wiring slot 18 is formed radially adjacent to the recess 41 of the annular member 12. The third wiring slot 20 is formed between the second wiring slot 18 and the fourth wiring slot 22. The fourth wiring slot 22 is formed at the innermost circumference of the annular member 12. Furthermore, a partition 42 is provided between the third wiring slot 20 and the fourth wiring slot 22. Multiple conductor leads 42a are formed on the partition 42. Figure 7 The conductor lead-out section 42a is for receiving the input conductor 21 arranged in the fourth wiring slot 22. Figure 12 It extends to the radial outer side of the annular component 12 and is formed into a concave shape.

[0074] Next, for the connecting conductors... Figures 9-11 Please provide an explanation.

[0075] The connecting conductors include coil termination connecting conductors 13a and 13b. Figure 9 ), conductor 17 for neutral point connection Figure 10 Conductor 19 (for connection between coil and ) Figure 11 Conductors 13a and 13b for connecting coil terminals are conductors used to connect terminals 9 of coil 6. Conductor 17 for connecting neutral point is used to connect coil 6 to the neutral point. Conductor 19 for connecting coils is used to connect coils 6 to each other. The following describes each connecting conductor in detail.

[0076] like Figure 9As shown, the coil termination conductor 13a and the coil termination conductor 13b are both L-shaped. However, the length of the coil termination conductor 13a is longer than the length of the coil termination conductor 13b. The coil termination conductors 13a and 13b are made of metal. They are integrally formed metal products obtained by pressure processing (punching and bending) of a conductor plate such as copper. A circular terminal 15a is formed at one end of the coil termination conductor 13a, and a heat-fitting terminal 23a is formed at the other end. Similarly, a circular terminal 15b is formed at one end of the coil termination conductor 13b, and a heat-fitting terminal 23b is formed at the other end. A circular terminal refers to a terminal with a circular hole.

[0077] Conductor 17 for neutral point connection Figure 10 The conductor shown is formed in an arc shape (C-shape). The neutral point connection conductor 17 is made of a single piece of metal. Six circular terminals 28a, 28b, 28c, 28d, 28e, and 28f are formed on the neutral point connection conductor 17. The neutral point connection conductor 17 is formed by pressure processing (punching and bending) of a conductor plate such as copper. The surface of the neutral point connection conductor 17, except for the circular terminals 28a to 28f, is covered with an insulating coating such as resin. The neutral point connection conductor 17 is used in a circuit where the motor circuit is configured with 6 series and 2 parallel connections.

[0078] Conductor 19 for connecting coils Figure 11 The diagram shows an insulated cable 24 made of a multi-core cable with a sheath, and circular terminals 30a and 30b connected to both ends of the insulated cable 24. The circular terminals 30a and 30b are electrically and mechanically connected to the ends of the insulated cable 24, for example, by mechanical riveting or welding.

[0079] Next, for the input conductor, use Figure 12 Please provide an explanation.

[0080] like Figure 12 As shown, the input conductor 21 consists of a multi-core cable 37 with a sheath and a circular terminal 31 connected to the end of the multi-core cable 37. The circular terminal 31 is electrically and mechanically connected to the end of the multi-core cable 37, for example, by mechanical riveting or welding.

[0081] Figure 13 This is a plan view showing the state in the first embodiment where only the coil terminal connection conductors 13a and 13b are installed on the annular component 12.

[0082] like Figure 13As shown, a total of 24 coil termination conductors 13a and 13b are mounted on the annular component 12. The coil termination conductors 13a and 13b are arranged in their respective first wiring slots 14. The circular terminal 15a of the coil termination conductor 13a and the terminal connection hole 16 are arranged concentrically, and the heat-fitting terminal 23a of the coil termination conductor 13a is arranged to protrude radially outward from the outer periphery of the annular component 12. Similarly, the circular terminal 15b of the coil termination conductor 13b and the terminal connection hole 16 are arranged concentrically, and the heat-fitting terminal 23b of the coil termination conductor 13b is arranged to protrude radially outward from the outer periphery of the annular component 12. Furthermore, arranging the circular terminal and the terminal connection hole in a concentric circle configuration is not limited to strict concentricity, but includes a state where the hole of the circular terminal and the terminal connection hole coincide.

[0083] Figure 14 This is a plan view showing the state in the first embodiment where only the neutral point connection conductor 17 is installed on the annular component 12.

[0084] like Figure 14 As shown, the neutral point connection conductor 17 is disposed in the second wiring slot 18. The six circular terminals 28a, 28b, 28c, 28d, 28e, and 28f of the neutral point connection conductor 17 are arranged concentrically with their corresponding terminal connection holes 16.

[0085] Figure 15 This is a plan view showing the state in the first embodiment where only the inter-coil connecting conductors 19 are installed on the annular component 12. When the motor circuit has a 6-series-2-parallel configuration, six inter-coil connecting conductors 19 are used. In the following description, the six inter-coil connecting conductors 19 will be distinguished by different reference numerals 19a, 19b, 19c, 19d, 19e, and 19f. However, when it is not necessary to distinguish between the six inter-coil connecting conductors 19a to 19f, they are collectively referred to as inter-coil connecting conductors 19.

[0086] like Figure 15As shown, six inter-coil connecting conductors 19a, 19b, 19c, 19d, 19e, and 19f are arranged in the third wiring slot 20. Furthermore, the inter-coil connecting conductors 19a, 19b, and 19c are arranged at different positions along the circumference of the annular member 12 compared to the inter-coil connecting conductors 19d, 19e, and 19f. Specifically, inter-coil connecting conductors 19a and 19d are arranged 180° off-center along the circumference of the annular member 12. Similarly, inter-coil connecting conductors 19b and 19e are arranged 180° off-center along the circumference of the annular member 12, and inter-coil connecting conductors 19c and 19f are also arranged 180° off-center along the circumference of the annular member 12.

[0087] Furthermore, the coil connecting conductors 19a, 19b, and 19c are arranged to partially overlap each other in the circumferential direction of the annular member 12, and the coil connecting conductors 19d, 19e, and 19f are also arranged to partially overlap each other in the circumferential direction of the annular member 12. The circular terminals 30a of each coil connecting conductor 19a, 19b, 19c, 19d, 19e, and 19f are arranged concentrically with their respective terminal connecting holes 16, and the circular terminals 30b of each coil connecting conductor 19a, 19b, 19c, 19d, 19e, and 19f are also arranged concentrically with their respective terminal connecting holes 16.

[0088] In the circumferential direction of the annular member 12, the circular terminals 30a and 30b of the coil-to-coil connecting conductor 19a and coil-to-coil connecting conductor 19c are arranged adjacent to each other, and the circular terminals 30a and 30b of the coil-to-coil connecting conductor 19d and coil-to-coil connecting conductor 19f are arranged adjacent to each other. Furthermore, in the circumferential direction of the annular member 12, the circular terminals 30b and 30b of the coil-to-coil connecting conductor 19a and coil-to-coil connecting conductor 19b are arranged adjacent to each other, and the circular terminals 30a and 30a of the coil-to-coil connecting conductor 19b and coil-to-coil connecting conductor 19c are arranged adjacent to each other. Additionally, in the circumferential direction of the annular member 12, the circular terminals 30b and 30b of the coil-to-coil connecting conductor 19d and coil-to-coil connecting conductor 19e are arranged adjacent to each other, and the circular terminals 30a and 30a of the coil-to-coil connecting conductor 19e and coil-to-coil connecting conductor 19f are arranged adjacent to each other. In addition, in the circumferential direction of the annular component 12, the circular terminal 30b of the coil connecting conductor 19a and the circular terminal 30a of the coil connecting conductor 19f are arranged adjacent to each other, and the circular terminal 30a of the coil connecting conductor 19c and the circular terminal 30b of the coil connecting conductor 19d are arranged adjacent to each other.

[0089] Figure 16 This is a plan view showing the state in the first embodiment where only the input conductors 21 are installed on the annular component 12. When the motor circuit is configured with a 6-series and 2-parallel connection, six input conductors 21 are used. In the following description, the six input conductors 21 will be distinguished by different reference numerals 21a, 21b, 21c, 21d, 21e, and 21f, and the circular terminals 31 of each input conductor 21 will be 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 circular terminals 31a to 31f, they will be collectively referred to as circular terminals 31.

[0090] like Figure 16 As shown, six input conductors 21a, 21b, 21c, 21d, 21e, and 21f are arranged in the fourth wiring slot 22. Input conductors 21a, 21b, and 21c are positioned at different locations along the circumference of the annular member 12 compared to input conductors 21d, 21e, and 21f. Furthermore, input conductors 21a, 21b, and 21c are arranged with partial overlap in the circumferential direction of the annular member 12, as are input conductors 21d, 21e, and 21f. The circular terminals 31a, 31b, 31c, 31d, 31e, and 31f of each input conductor 21a, 21b, 21c, 21d, 21e, and 21f are arranged concentrically with their corresponding terminal connection holes 16.

[0091] In the circumferential direction of the annular member 12, the circular terminal 31a of the input conductor 21a is arranged adjacent to the circular terminal 31b of the input conductor 21b, and the circular terminal 31b of the input conductor 21b is arranged adjacent to the circular terminal 31c of the input conductor 21c. Furthermore, in the circumferential direction of the annular member 12, the circular terminal 31d of the input conductor 21d is arranged adjacent to the circular terminal 31e of the input conductor 21e, and the circular terminal 31e of the input conductor 21e is arranged adjacent to the circular terminal 31f of the input conductor 21f.

[0092] Figure 17 This is a plan view showing the structure of the junction plate 26 in the case of 6 series and 2 parallel connections.

[0093] like Figure 17 As shown, the junction plate 26 is constructed by mounting connecting conductors (coil terminal connecting conductors 13a, 13b, neutral point connecting conductor 17, and coil inter-connecting conductor 19) and input conductor 21 on the annular member 12 as described above. Multiple terminal connection holes 16 are provided in the annular member 12. Figure 7 , Figure 8 Bolts 27 are installed in the respective parts. Bolts 27 are tightened in such a state that the external thread of bolt 27 is engaged with the screw hole, i.e., the terminal connection hole 16.

[0094] Bolt 27 at position P1 secures the terminals of coil terminal connection conductor 13a and neutral point connection conductor 17 together to the terminal connection hole 16. Additionally, bolt 27 at position P2 secures the terminals of coil terminal connection conductors 13a and 13b and the terminal of inter-coil connection conductor 19 together to the terminal connection hole 16, and at position P3 secures the terminal of coil terminal connection conductor 13b and the terminal of input conductor 21 together to the terminal connection hole 16. "Jointly securing" refers to tightening multiple terminals together; more specifically, it refers to tightening multiple terminals overlapping each other.

[0095] More specifically, at position P1, the circular terminals 28a, 28b, 28c, 28d, 28e, and 28f of the neutral point connection conductor 17 and the circular terminal 15a of the corresponding coil termination connection conductor 13a are fastened together by bolts 27. Furthermore, at position P2, the circular terminal 15a of the coil termination connection conductor 13a and the circular terminal 30b of the inter-coil connection conductor 19 are fastened together by bolts 27, and the circular terminal 15b of the coil termination connection conductor 13b and the circular terminal 30a of the inter-coil connection conductor 19 are also fastened together by bolts 27. Additionally, at position P3, the circular terminals 31 (31a, 31b, 31c, 21d, 21e, 21f) of the input conductors 21 (21a, 21b, 21c, 21d, 21e, 21f) and the circular terminal 15b of the corresponding coil termination connection conductor 13b are fastened together by bolts 27.

[0096] The wiring plate 26, constructed using the above structure, is installed in Figure 1 The stator housing 10 is shown. At this time, the annular member 12, which serves as the base component of the wiring plate 26, is fixed to the stator housing 10 by adhesive or the like. Additionally, multiple bolts 11 are installed on the annular member 8a. Figure 5 A plurality of recesses 40 are disposed on one side of the bottom surface of the annular member 12. Figure 7 Inside. Additionally, such as... Figure 6 and Figure 18 As shown, the hot-fusing terminals 23a and 23b of the conductors 13a and 13b for connecting each coil terminal are joined to the terminals 9 of the corresponding coil 6 by hot fusing. In this case, when the coil 6 is constructed with enameled wire of a circular cross-section, when the terminals 23a and 23b are pressed against the terminals 9 of the coil 6, the contact state between the hot-fusing terminals 23a and 23b and the terminals 9 is point contact, which enables good hot fusing.

[0097] By using the wiring board 26 to electrically connect multiple coils 6, the circuit of the motor 100 is as follows: Figure 19 The structure shown is a 6-series and 2-parallel configuration.

[0098] Depend on Figure 19 As can be seen, the motor 100 is a three-phase motor with U-phase coils, V-phase coils, and W-phase coils. Each phase coil consists of 12 coils 6. Therefore, the motor 100, which is a three-phase motor, has a total of 36 coils 6. An AC voltage is applied to the coils of each phase via their respective input conductors 21. In addition, the coils of each phase are connected by a neutral point connection conductor 17. Of the 12 coils 6 belonging to the U-phase coil, 6 coils 6 are connected in series via an inter-coil connection conductor 19, and the other 6 coils 6 are also connected in series via an inter-coil connection conductor 19. Then, the 6 coils 6 connected in series are connected in parallel. That is, the U-phase coil has a structure of 6 series and 2 parallel. This is also the case for the V-phase and W-phase coils.

[0099] Next, the method for changing the number of coils connected in parallel in the circuit of the electric motor will be explained.

[0100] First, the above Figure 19 The circuit shown is a 6-series-2-parallel configuration, so the number of coils connected in parallel is 2. In contrast, when the circuit of motor 100 is switched from a 6-series-2-parallel configuration to a 3-series-4-parallel configuration, the number of coils connected in parallel becomes twice that of the 6-series-2-parallel configuration, i.e., 4.

[0101] When the same voltage is applied to the input conductor 21 of each phase of the circuit, even if the number of magnetic poles 7 in the motor 100 is the same, the current flowing in each coil 6 varies depending on the number of coils connected in parallel. For example, even if the resistance values ​​(conductor area and number of turns) of the coils 6 of each magnetic pole 7 are the same, the current flowing in each coil 6 in a circuit with 3 series and 4 parallel connections is 4 times that in a circuit with 6 series and 2 parallel connections. That is, even for motors with the same number of magnetic poles, different outputs can be obtained by changing the number of coils connected in parallel.

[0102] When switching the circuit of the motor 100 from a 6-series-2-parallel configuration to a 3-series-4-parallel configuration, the annular component 12 and the coil terminal connecting conductors 13a and 13b are used in the same manner as in the 6-series-2-parallel configuration, but the inter-coil connecting conductor 19 is not used. Therefore, during circuit switching, it is not necessary to install or remove the annular component 12, but it is necessary to remove the inter-coil connecting conductors 19 (19a to 19f) from the annular component 12. That is, in the 3-series-4-parallel configuration, the connecting conductor is not placed in the third wiring slot 20 of the annular component 12.

[0103] Furthermore, when switching the circuit of motor 100 from 6 series and 2 parallel to 3 series and 4 parallel, the above-mentioned... Figure 10 The neutral point connection conductor 17 shown is used. Figure 20 The neutral point connection conductor 32 shown is formed in an arc shape (C-shape). The neutral point connection conductor 32 is a one-piece molded metal product. Twelve circular terminals 33a, 33b, 33c, 33d, 33e, 33f, 33g, 33h, 33i, 33j, 33k, and 33l are formed on the neutral point connection conductor 32. The neutral point connection conductor 32 is obtained by pressure processing (punching and bending) of a conductor plate such as copper. The surface of the neutral point connection conductor 32, except for the circular terminals 33a to 33l, is covered with an insulating coating such as resin.

[0104] Figure 21 This is a plan view showing the state in the first embodiment where only the neutral point connection conductor 32 is installed on the annular component 12.

[0105] like Figure 21 As shown, the neutral point connection conductor 32 is disposed in the second wiring slot 18. The 12 circular terminals 33a, 33b, 33c, 33d, 33e, 33f, 33g, 33h, 33i, 33j, 33k, and 33l of the neutral point connection conductor 32 are arranged concentrically with their respective terminal connection holes 16.

[0106] Furthermore, when switching the circuit of the motor 100 from 6 series and 2 parallel to 3 series and 4 parallel, 12 input conductors 21 are used. That is, in the case of 3 series and 4 parallel, the number of input conductors 21 used is doubled compared to the case of 2 series and 2 parallel.

[0107] Figure 22 This is a plan view showing the state in the first embodiment where only the input conductor 21 is installed on the annular component 12.

[0108] In the following description, the 12 input conductors 21 will be distinguished by different reference numerals 21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h, 21i, 21j, 21k, and 21l, and the circular terminals 31 of each input conductor 21 will be distinguished by different reference numerals 31a, 31b, 31c, 31d, 31e, 31f, 31g, 31h, 31i, 31j, 31k, and 31l. However, when it is not necessary to distinguish between the 12 input conductors 21a to 21l, they will be collectively referred to as input conductors 21, and when it is not necessary to distinguish between the 12 circular terminals 31a to 31l, they will be collectively referred to as circular terminals 31.

[0109] like Figure 22 As shown, 12 input conductors 21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h, 21i, 21j, 21k, and 21l are arranged in the fourth wiring slot 22. The circular terminals 31a, 31b, 31c, 31d, 31e, 31f, 21g, 21h, 21i, 21j, 21k, and 21l of each input conductor 21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h, 21i, 21j, 21k, and 31l are arranged concentrically with their corresponding terminal connection holes 16. The 12 circular terminals 31a to 31l are arranged in the circumferential direction of the annular member 12 from the circular terminal 31a to the circular terminal 31l. Figure 22 Arranged sequentially in a clockwise direction.

[0110] Furthermore, the state in which only coil terminal connection conductors 13a and 13b are installed on the annular component 12 is the same as the case where 6 is connected in series and 2 in parallel. Figure 13 Since they are the same, the explanation is omitted.

[0111] Figure 23 This is a plan view showing the structure of the junction plate 26 in the case of 3 series and 4 parallel connections.

[0112] like Figure 23 As shown, the junction plate 26 is constructed by mounting connecting conductors (coil terminal connecting conductors 13a, 13b, neutral point connecting conductor 32) and input conductor 21 on the annular member 12 as described above. Multiple terminal connection holes 16 are provided in the annular member 12. Figure 7 , Figure 8 Bolts 27 are installed in each of the components. The bolts 27 are tightened in such a state that the external thread of the bolt 27 is engaged with the screw hole, i.e., the terminal connection hole 16.

[0113] Bolt 27 at position P1 secures the terminals of coil terminal connection conductor 13a and neutral point connection conductor 32 together to terminal connection hole 16. Additionally, bolt 27 at position P3 secures the terminals of coil terminal connection conductor 13b and input conductor 21 together to terminal connection hole 16.

[0114] More specifically, at position P1, the circular terminals 33a, 33b, 33c, 33d, 33e, 33f, 33g, 33h, 33i, 33j, 33k, and 33l of the neutral point connection conductor 32 and the circular terminal 15a of the corresponding coil terminal connection conductor 13a are fastened together by bolt 27. Furthermore, at position P3, the circular terminals 31 (31a, 31b, 31c, 21d, 21e, 21f, 21g, 21h, 21i, 21j, 21k, and 21l) of the input conductors 21 (21a, 21b, 21c, 21d, 21e, 31f, 31g, 31h, 31i, 31j, 31k, and 31l) and the circular terminal 15b of the corresponding coil terminal connection conductor 13b are fastened together by bolt 27.

[0115] By using the wiring board 26 to electrically connect multiple coils 6, the circuit of the motor 100 is as follows: Figure 24 The diagram shows a structure of 3 series and 4 parallel connections.

[0116] Depend on Figure 24 As can be seen, the motor 100 is a three-phase motor with U-phase coils, V-phase coils, and W-phase coils, each phase consisting of 12 coils 6. An AC voltage is applied to each phase coil via its corresponding input conductor 21. Furthermore, each phase coil is connected by a neutral point connection conductor 32. The 12 coils 6 belonging to the U-phase coil are as described above. Figure 4 The diagram shows three coils (6) connected in series as a group, and these three coils (6) are connected in parallel among themselves. That is, the U-phase coil has a 3-in-series, 4-in-parallel structure. The same applies to the V-phase and W-phase coils.

[0117] Furthermore, when switching the circuit of motor 100 from 3 series and 4 parallel to 6 series and 2 parallel, instead of Figure 20 The neutral point connection conductor 32 shown is used. Figure 10 The neutral point connection conductor 17 is shown, and the coil connection conductor 19 is arranged in the third wiring slot 20 of the annular component 12, so that the number of input conductors 21 used can be reduced from 12 to 6.

[0118] As explained above, in the motor 100 of the first embodiment, the circuit structure can be switched from 6 series-2 parallel to 3 series-4 parallel, or from 3 series-4 parallel to 6 series-2 parallel, by using the annular member 12, which is a main component of the wiring board 26, and the coil terminal connection conductors 13a and 13b. Then, by switching the circuit, the number of parallel coils can be changed. Furthermore, in the first embodiment, the terminals of the connecting conductors (coil terminal connection conductors 13a and 13b, neutral point connection conductors 17 and 32, and coil inter-connection conductor 19) and the terminals of the input conductor 21 are jointly fastened to the terminal connection hole 16. Therefore, the cumbersome manual wiring work or a dedicated wiring board is not required to handle changes in the number of parallel coils.

[0119] Furthermore, 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 jointly tightened with bolts 27. This allows for easy installation and removal 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.

[0120] In addition, in the first embodiment, the terminals 23a and 23b of the coil terminal connecting conductors 13a and 13b are joined to the terminal 9 of the coil 6 by heat riveting. Therefore, the terminal 9 of the coil 6 can be electrically connected to the coil terminal connecting conductors 13a and 13b without removing the insulation coating. Furthermore, by omitting the step of removing the insulation coating, the coating stripping device and process can be eliminated, enabling low-cost and short-time motor production.

[0121] In addition, in the first embodiment, the terminals of the connecting conductors (coil terminal connecting conductors 13a, 13b, neutral point connecting conductors 17, 32, and coil inter-connecting conductor 19) and the input conductor 21 are respectively made of circular terminals. Therefore, when the terminals are tightened together with bolts 27, the terminals can be tightened together by inserting bolts 27 into the holes of each terminal to suppress the positional deviation of the terminals.

[0122] In addition, in the first embodiment, the coil-to-coil connection conductor 19 is constructed using an insulated cable 24 and circular terminals 30a and 30b, so the terminal connection hole 16 of the annular member 12 can be easily aligned with the circular terminals 30a and 30b of the coil-to-coil connection conductor 19.

[0123] <Second Implementation>

[0124] Figure 25This is a perspective view showing an enlarged view of the main part of the electric motor in the second embodiment.

[0125] Compared to the first embodiment, the second embodiment of the motor differs in the connection structure between the terminal 9 of the coil 6 and the conductors 13a and 13b connecting the coil terminals. The coil 6 is preferably constructed of flat enameled wire that facilitates alignment and contact between the terminals 25a and 25b of the conductors 13a and 13b connecting the coil terminals and the terminal 9 of the coil 6. Furthermore, when the coil 6 is constructed of flat enameled wire, it is difficult to continuously wind multiple coils 6. Therefore, Figure 25 In this design, each coil 6 is individually wound, and the ends of three consecutive coils in the circumferential direction are welded together at two points. The ends 9 of the coil 6 are bent upwards. Correspondingly, the terminal 25a of the coil terminal connecting conductor 13a is also bent upwards, as is the terminal 26b of the coil terminal connecting conductor 13b. Then, the terminal 25a of the coil terminal connecting conductor 13a and its corresponding end 9 of the coil 6 are joined by welding. The terminal 25a and end 9 are joined, for example, by TIG welding or laser welding. Similarly, the terminal 25b of the coil terminal connecting conductor 13b and its corresponding end 9 of the coil 6 are also joined by welding.

[0126] Thus, in the second embodiment, the terminals 25a and 25b of the coil terminal connecting conductors 13a and 13b are soldered to the terminal 9 of the coil 6. Therefore, when the coil 6 is constructed using flat enameled wire, a reliable electrical connection can be made between the terminal 9 of the coil 6 and the coil terminal connecting conductors 13a and 13b.

[0127] In addition, as a joining method other than welding, ultrasonic joining can also be considered.

[0128] <Third Implementation Method>

[0129] Figure 26 This is a plan view showing the structure of the annular component in the third embodiment.

[0130] like Figure 26 As shown, the annular component 12 is essentially the same as the structure of the first embodiment ( Figure 8Specifically, on one side of the top surface of the annular member 12, a plurality of first wiring slots 14, a plurality of terminal connection holes 16, a second wiring slot 18, a third wiring slot 20, and a fourth wiring slot 22 are formed. The first wiring slots 14 are formed on the outermost periphery of the annular member 12 and are L-shaped in plan view. The terminal connection holes 16 are formed on the outermost periphery of the annular member 12 and are circular in plan view. The second wiring slots 18, the third wiring slots 20, and the fourth wiring slots 22 are formed in a concentric circle shape. In addition, a partition 42 is provided between the third wiring slot 20 and the fourth wiring slot 22.

[0131] Figure 27 This is a plan view showing the state in the third embodiment where only the coil terminal connection conductors 13a and 13b are installed on the annular component 12.

[0132] like Figure 27 As shown, a total of 24 coil termination conductors 13a and 13b are mounted on the annular component 12. The coil termination conductors 13a and 13b are disposed in corresponding first wiring slots 14. The circular terminal 15a of the coil termination conductor 13a and the terminal connection hole 16 are arranged concentrically, and the heat-fitting terminal 23a of the coil termination conductor 13a is arranged to protrude in the circumferential direction of the annular component 12. Similarly, the circular terminal 15b of the coil termination conductor 13b and the terminal connection hole 16 are arranged concentrically, and the heat-fitting terminal 23b of the coil termination conductor 13b is arranged to protrude in the circumferential direction of the annular component 12. Furthermore, the heat-fitting terminals 23a and 23b of adjacent coil termination conductors 13a and 13b in the circumferential direction of the annular component 12 are arranged opposite each other.

[0133] Figure 28 This is a perspective view showing the structure of the conductor 29 for connecting coils in the third embodiment.

[0134] like Figure 28 As shown, the coil-to-coil connecting conductor 29 is a substitute for the coil-to-coil connecting conductor 19 used in the first embodiment, and is formed in an arc shape. The coil-to-coil connecting conductor 29 is made of a single piece of metal. A circular terminal 34a is formed at one end of the coil-to-coil connecting conductor 29, and a circular terminal 34b is formed at the other end of the coil-to-coil connecting conductor 29. The coil-to-coil connecting conductor 29 is formed by pressure processing (punching and bending) of a conductor plate such as copper. The surface of the coil-to-coil connecting conductor 29, except for the portions of the circular terminals 34a and 34b, is covered with an insulating coating such as resin.

[0135] Figure 29This is a plan view showing the state in the third embodiment where only the inter-coil connecting conductors 29 are installed on the annular component 12. Six inter-coil connecting conductors 29 are used when the motor circuit has a 6-series-2-parallel configuration. In the following description, the six inter-coil connecting conductors 29 will be distinguished by different reference numerals 29a, 29b, 29c, 29d, 29e, and 29f. However, when it is not necessary to distinguish between the six inter-coil connecting conductors 29a to 29f, they are collectively referred to as inter-coil connecting conductors 29.

[0136] like Figure 29 As shown, six inter-coil connecting conductors 29a, 29b, 29c, 29d, 29e, and 29f are arranged in the third wiring slot 20. These six inter-coil connecting conductors 29a, 29b, 29c, 29d, 29e, and 29f are arranged in the same manner as the six inter-coil connecting conductors 19a, 19b, 19c, 19d, 19e, and 19f in the first embodiment, as described below. The inter-coil connecting conductors 29a, 29b, and 29c are arranged at different positions in the circumferential direction of the annular member 12 compared to the inter-coil connecting conductors 29d, 29e, and 29f. Specifically, the inter-coil connecting conductors 29a and 29d are arranged at a 180° offset position in the circumferential direction of the annular member 12. Similarly, the coil connecting conductor 29b and the coil connecting conductor 29e are arranged 180° apart in the circumferential direction of the annular member 12, and the coil connecting conductor 29c and the coil connecting conductor 29f are also arranged 180° apart in the circumferential direction of the annular member 12.

[0137] Furthermore, the conductors 29a, 29b, and 29c for connecting the coils are arranged to partially overlap each other in the circumferential direction of the annular member 12, and the conductors 29d, 29e, and 29f for connecting the coils are also arranged to partially overlap each other in the circumferential direction of the annular member 12. The circular terminals 34a of each conductor 29a, 29b, 29c, 29d, 29e, and 29f are arranged concentrically with their respective terminal connection holes 16, and the circular terminals 34b of each conductor 29a, 29b, 29c, 29d, 29e, and 29f are also arranged concentrically with their respective terminal connection holes 16.

[0138] In the circumferential direction of the annular member 12, the circular terminals 34a and 34b of the coil-to-coil connecting conductor 29a and coil-to-coil connecting conductor 29c are arranged adjacent to each other, and the circular terminals 34a and 34b of the coil-to-coil connecting conductor 29d and coil-to-coil connecting conductor 29f are arranged adjacent to each other. Furthermore, in the circumferential direction of the annular member 12, the circular terminals 34b and 34a of the coil-to-coil connecting conductor 29a and coil-to-coil connecting conductor 29b are arranged adjacent to each other, and the circular terminals 34a and 34a of the coil-to-coil connecting conductor 29b and coil-to-coil connecting conductor 29c are arranged adjacent to each other. Additionally, in the circumferential direction of the annular member 12, the circular terminals 34b and 34b of the coil-to-coil connecting conductor 29d and coil-to-coil connecting conductor 29e are arranged adjacent to each other, and the circular terminals 34a and 34a of the coil-to-coil connecting conductor 29e and coil-to-coil connecting conductor 29f are arranged adjacent to each other. In addition, in the circumferential direction of the annular component 12, the circular terminal 34b of the coil connecting conductor 29a and the circular terminal 34a of the coil connecting conductor 29f are arranged adjacent to each other, and the circular terminal 34a of the coil connecting conductor 29c and the circular terminal 34b of the coil connecting conductor 29d are arranged adjacent to each other.

[0139] Figure 30 This is a plan view showing the state in the third embodiment where only the neutral point connection conductor 17 is installed on the annular component 12. The structure of the neutral point connection conductor 17 is the same as in the first embodiment. Figure 10 )same.

[0140] like Figure 30 As shown, the neutral point connection conductor 17 is disposed in the second wiring slot 18. The six circular terminals 28a, 28b, 28c, 28d, 28e, and 28f of the neutral point connection conductor 17 are arranged concentrically with their corresponding terminal connection holes 16.

[0141] Figure 31 This is a plan view showing the state in the third embodiment where only the input conductor 21 is installed on the annular component 12. The structure of the input conductor 21 is the same as in the first embodiment. Figure 12 )same.

[0142] When the motor circuit is configured with a 6-series and 2-parallel connection, 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 circular 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 are collectively referred to as input conductors 21, and when it is not necessary to distinguish between the six circular terminals 31a to 31f, they are collectively referred to as circular terminals 31.

[0143] like Figure 31 As shown, six input conductors 21a, 21b, 21c, 21d, 21e, and 21f are arranged in the fourth wiring slot 22. Input conductors 21a, 21b, and 21c are positioned at different locations along the circumference of the annular member 12 compared to input conductors 21d, 21e, and 21f. Furthermore, input conductors 21a, 21b, and 21c are arranged with partial overlap in the circumferential direction of the annular member 12, as are input conductors 21d, 21e, and 21f. The circular terminals 31a, 31b, 31c, 31d, 31e, and 31f of each input conductor 21a, 21b, 21c, 21d, 21e, and 21f are arranged concentrically with their corresponding terminal connection holes 16.

[0144] In the circumferential direction of the annular member 12, the circular terminal 31a of the input conductor 21a is arranged adjacent to the circular terminal 31b of the input conductor 21b, and the circular terminal 31b of the input conductor 21b is arranged adjacent to the circular terminal 31c of the input conductor 21c. Furthermore, in the circumferential direction of the annular member 12, the circular terminal 31d of the input conductor 21d is arranged adjacent to the circular terminal 31e of the input conductor 21e, and the circular terminal 31e of the input conductor 21e is arranged adjacent to the circular terminal 31f of the input conductor 21f.

[0145] Figure 32 This is a plan view showing the structure of the wiring plate 26 in the case of 6 connected in series and 2 connected in parallel in the third embodiment.

[0146] like Figure 32 As shown, the junction plate 26 is constructed by mounting connecting conductors (coil terminal connecting conductors 13a, 13b, neutral point connecting conductor 17, and coil inter-connecting conductor 29) and input conductor 21 on the annular member 12 as described above. Multiple terminal connection holes 16 are provided in the annular member 12. Figure 7 , Figure 8Bolts 27 are installed in each of the components. The bolts 27 are tightened in such a state that the external thread of the bolt 27 is engaged with the screw hole, i.e., the terminal connection hole 16.

[0147] Bolt 27 at position P1 secures the terminals of coil terminal connection conductor 13a and neutral point connection conductor 17 together to terminal connection hole 16. Additionally, bolt 27 at position P2 secures the terminals of coil terminal connection conductors 13a and 13b and the terminal of inter-coil connection conductor 29 together to terminal connection hole 16, and at position P3 secures the terminals of coil terminal connection conductor 13b and input conductor 21 together to terminal connection hole 16.

[0148] More specifically, at position P1, the circular terminals 28a, 28b, 28c, 28d, 28e, and 28f of the neutral point connection conductor 17 and the circular terminal 15b of the corresponding coil termination connection conductor 13a are fastened together by bolts 27. Furthermore, at position P2, the circular terminal 15a of the coil termination connection conductor 13a and the circular terminal 34b of the inter-coil connection conductor 29 are fastened together by bolts 27, and the circular terminal 15b of the coil termination connection conductor 13b and the circular terminal 34a of the inter-coil connection conductor 29 are also fastened together by bolts 27. Additionally, at position P3, the circular terminals 31 (31a, 31b, 31c, 21d, 21e, 21f) of the input conductors 21 (21a, 21b, 21c, 21d, 21e, 21f) and the circular terminal 15b of the corresponding coil termination connection conductor 13b are fastened together by bolts 27.

[0149] The wiring plate 26, constructed using the above structure, is installed in Figure 1 The stator housing 10 is shown. Furthermore, the terminals 23a and 23b of the coil terminal connecting conductors 13a and 13b are joined to the terminals 9 of the corresponding coils 6 by fusing. By electrically connecting multiple coils 6 using the wiring board 26 in this way, the circuit of the motor 100 is as follows: Figure 19 The circuit shown is a 6-series-2-parallel configuration. Furthermore, when switching the circuit of the motor 100 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, similar to the first embodiment described above. The number of input conductors 21 is increased from 6 to 12, and the coil connection conductor 29 is not used.

[0150] In the third embodiment, since the conductor 29 for connecting coils is made of a single piece of metal, the conductor 29 for connecting coils can be mass-produced by pressure molding, and can be manufactured inexpensively.

[0151] <Fourth Implementation>

[0152] In the fourth embodiment, compared with the first embodiment described above, the structure of the terminal connection hole 16 of the annular component 12 and the common fastening structure of the terminals in the terminal connection hole 16 are different. Specific examples will be given below for explanation.

[0153] Figure 33 This is an enlarged cross-sectional view of the main part of the electric motor in the fourth embodiment.

[0154] Figure 33 In this design, the terminal connection hole 16 of the annular component 12 is a through hole. In the terminal connection hole 16, the circular terminal 15a of the coil terminal connection conductor 13a is positioned below, and the circular terminal 28a of the neutral point connection conductor 17 is positioned above, with the circular terminals 15a and 28a overlapping. The external thread of the bolt 27 is inserted into the circular terminals 15a and 28a. The external thread of the bolt 27 engages with the nut 35. The nut 35 can be integrally formed with the annular component 12 by means of insert forming or the like, or it can be separately formed from the annular component 12. The circular terminals 15a and 28a are jointly fastened by the bolt 27 and the nut 35. This allows for a more secure joint fastening of the circular terminals 15a and 28a. Furthermore, the joint fastening structure of the terminals formed by the bolt 27 and the nut 35 is applied to... Figure 17 Positions P1, P2, P3, and P4 are shown. Therefore, it is easier to perform loading and unloading operations for the connecting conductors (coil terminal connecting conductors 13a and 13b, neutral point connecting conductors 17 and 32, and coil connecting conductor 19) and the input conductor 21.

[0155] <Fifth Implementation>

[0156] In the fifth embodiment, compared with the first embodiment described above, the structure of the terminal connection hole 16 of the annular component 12 and the common fastening structure of the terminals in the terminal connection hole 16 are different. Specific examples will be given below for explanation.

[0157] Figure 34 This is an enlarged cross-sectional view of the main part of the electric motor in the fifth embodiment.

[0158] Figure 34In the annular component 12, the terminal connection hole 16 is a through hole. In the terminal connection hole 16, the circular terminal 15a of the coil terminal connection conductor 13a is positioned below, and the circular terminal 28a of the neutral point connection conductor 17 is positioned above, with the circular terminals 15a and 28a overlapping. The circular terminals 15a and 28a are inserted into the shaft portion of the rivet 36. The circular terminals 15a and 28a are jointly fastened by the rivet 36. This allows for a more secure joint fastening of the circular terminals 15a and 28a. Furthermore, the joint fastening structure of the terminals formed by the rivet 36 is applied to... Figure 17 The positions P1, P2, P3, and P4 are shown.

[0159] <Examples of variations, etc.>

[0160] This invention is not limited to the embodiments described above, and includes various modifications. For example, the invention has been described in detail in the above embodiments for ease of understanding, but it is not limited to having all the structures described in the above embodiments. Furthermore, a portion of the structure of one embodiment can be replaced with a structure of another embodiment. Additionally, structures of other embodiments can be added to the structure of one embodiment. Furthermore, a portion of the structure of each embodiment can be deleted, or other structures can be added, or other structures can be replaced.

[0161] Furthermore, the above embodiment is illustrated by the example where both the terminal for connection and the terminal for input are circular terminals. However, the terminal is not limited to circular terminals. For example, it can also be a U-shaped terminal or a shovel-shaped terminal, as long as it is a shape that can accommodate joint fastening.

[0162] Furthermore, while the above embodiments were described with respect to an external rotor type split core and concentrated winding motor, the same effect can also be obtained in an internal rotor type split core and concentrated winding motor.

[0163] In addition, the example of a motor circuit with 36 magnetic poles, 6 in series and 2 in parallel, and 3 in series and 4 in parallel was used for illustration, but the combination of magnetic poles and parallel connections is not limited to this.

[0164] Explanation of reference numerals in the attached figures

[0165] 4…Divided core, 6…Coil, 9…Terminal, 12…Annular component, 13a, 13b…Conductors for coil terminal connection, 14…First wiring slot, 15a, 15b…Circular terminal, 16…Terminal connection hole, 17…Conductor for neutral point connection, 18…Second wiring slot, 19…Conductor for coil connection, 20…Third wiring slot, 21…Input conductor, 22…Fourth wiring slot, 24…Insulated cable, 27…Bolt, 28…Circular terminal, 29…Conductor for coil connection, 30a, 30b…Circular terminal, 31…Circular terminal, 32…Conductor for neutral point connection, 33…Circular terminal, 34a, 34b…Circular terminal, 35…Nut, 36…Rivet, 100…Motor.

Claims

1. An electric motor, characterized in that, include: Multiple segmented cores arranged in a circular direction; Multiple coils respectively wound around the multiple segmented cores; A ring-shaped component having multiple wiring slots and multiple terminal connection holes; Multiple connecting conductors and multiple input conductors are disposed in the wiring slot; and A circuit formed by electrically connecting the plurality of coils, the plurality of connecting conductors, and the plurality of input conductors. The plurality of connecting conductors are used to connect the plurality of coils. The plurality of input conductors are used to apply an alternating voltage to the plurality of coils. Each of the plurality of connecting conductors and the plurality of input conductors has a terminal, and the terminals of both the plurality of connecting conductors and the plurality of input conductors are electrically and mechanically fixed to the terminal connecting hole by common fastening.

2. The electric motor as described in claim 1, characterized in that: The terminals are fastened together with bolts.

3. The electric motor as described in claim 1, characterized in that: The terminal is secured by both bolts and nuts.

4. The electric motor as described in claim 1, characterized in that: The terminals are fastened together by rivets.

5. The electric motor as described in claim 1, characterized in that: The terminal is a circular terminal.

6. The electric motor as described in claim 1, characterized in that: The connecting conductors include conductors for connecting coils. The conductor connecting the coils consists of an insulated cable and terminals connected to both ends of the insulated cable.

7. The electric motor as described in claim 1, characterized in that: The connecting conductors include conductors for connecting coils. The conductors connecting the coils are made of a single piece of metal.

8. The electric motor as described in claim 1, characterized in that: The coil is made of flat enameled wire.

9. The electric motor as described in claim 1, characterized in that: The coil is made of enameled wire with a circular cross-section.

10. The electric motor as claimed in claim 1, characterized in that: The connecting conductor includes a coil terminal connecting conductor that is joined to the terminal of the coil by heat riveting or welding.

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