Motor having bus ring structure

Abstract

To provide a motor having bus ring structure with the reduced number and types of components.SOLUTION: A motor has bus ring structure formed of a plurality of conducting wires to be joined to excitation windings and a conductor plate. In the motor, the bus ring structure is formed by arranging bus rings for every phase for connecting a plurality of excitation windings constituting each phase of the motor in line in a direction in which an output shaft of the motor extends. The conductor plate is provided with a connection part to which a terminal with which an external power source is connected is fixed. One ends of the conducting wires are joined to the conductor plate, and the other ends of the conducting wires are joined to the excitation windings arranged at first predetermined intervals around the output shaft.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This specification discloses a technique related to a motor having a bus ring structure. [Background technology]

[0002] Patent Document 1 discloses a motor with a bus ring structure. In the bus ring structure of Patent Document 1, bus rings for each phase (U phase, V phase, W phase) are arranged side by side in the direction of the rotation axis, and the bus rings for each phase are fixed with 12 fixing members. A connection terminal that is connected to the corresponding excitation winding is connected to each fixing member. Furthermore, power supply terminals for supplying power to the excitation windings of each phase are connected to three of the 12 fixing members. In Patent Document 1, the bus rings for each phase are covered with an insulator to prevent short-circuiting between the bus rings. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-223023 Summary of the Invention [Problem to be solved by the invention]

[0004] The bus ring structure of Patent Document 1 uses the same number of fixing members and connection terminals as the number of excitation windings. Furthermore, in the bus ring structure of Patent Document 1, the fixing members to which only the excitation windings are connected and the fixing members to which the excitation windings and power supply terminals are connected have different shapes. In other words, the bus ring structure of Patent Document 1 requires two types of fixing members. As such, the bus ring structure of Patent Document 1 requires a large number and variety of parts to fabricate. An object of this specification is to provide a motor having a bus ring structure with a reduced number and variety of parts. [Means for solving the problem]

[0005] A first technology disclosed in this specification may be a motor having a bus ring structure formed by a plurality of conductors joined to excitation windings and a conductor plate. In this motor, the bus ring structure is formed by arranging bus rings for each phase, for connecting the plurality of excitation windings that constitute each phase of the motor, in a line in a direction in which an output shaft of the motor extends, the conductor plate being provided with a connection portion to which a terminal to which an external power supply is connected is fixed, and one end of the conductors may be joined to the conductor plate, and the other end of the conductors may be joined to the excitation windings arranged at a first predetermined interval around the output shaft.

[0006] The second technology disclosed in this specification is a motor according to the first technology, wherein the bus rings of each phase may be arranged so that the distance between the terminal fixed to the conductor plate of a specific phase and the terminal fixed to the conductor plate of another phase is an integer multiple of the first predetermined distance.

[0007] The third technology disclosed in this specification is a motor according to the first or second technology, wherein the bus ring has a gap at a position opposite the conductor plate across the output shaft, and the conductor wire arranged in a first circumferential direction from the conductor plate of the bus ring toward the gap may be the same as the conductor wire arranged in a second direction opposite to the first circumferential direction from the conductor plate of the bus ring toward the gap.

[0008] A fourth technology disclosed in this specification is a motor according to any one of the first to third technologies, wherein the conductor plate may have a protrusion for joining one end of the conductor wire and a first through hole for guiding the conductor wire to the protrusion.

[0009] A fifth technique disclosed in this specification is a motor according to any one of the first to fourth techniques, in which the bus rings of each phase may have the same shape.

[0010] The sixth technology disclosed in this specification is a motor according to any one of the first to fifth technologies, further comprising an insulating protector for surrounding and protecting the terminal, and the conductor plate may be provided with a second through hole for attaching the terminal and a notch for attaching the protector.

[0011] The seventh technology disclosed in this specification is the motor of the sixth technology, wherein the protector may have a fitting portion that regulates misalignment of the terminal by keeping the gap with the terminal below a predetermined value. [Effects of the Invention]

[0012] According to the first technology, the bus ring structure can be formed using only conductor plates and conductor wires, which reduces the number and variety of parts required to manufacture a motor, thereby reducing the manufacturing cost of the motor.

[0013] According to the second technique, terminals (terminals to which an external power supply is connected) can be arranged in appropriate positions depending on the number of excitation windings (coils) that make up the motor.

[0014] According to the third technology, it is possible to reduce the number of types of conductors that make up the bus ring, which further reduces the number of types of parts required to manufacture a motor and further reduces the manufacturing costs of the motor.

[0015] According to the fourth technique, the conductive plate and the conductive wire can be easily joined together and can be joined together more reliably.

[0016] According to the fifth technique, the number of parts required to fabricate a bus ring structure can be further reduced. In other words, a bus ring structure consisting of multiple bus rings can be fabricated using the same number of parts required to fabricate a single bus ring. As a result, the manufacturing costs of the motor can be further reduced.

[0017] According to the sixth technique, it is possible to easily position the terminal (terminal to which the external power supply is connected) relative to the bus ring and to easily position (prevent rotation of) the protector relative to the terminal.

[0018] According to the seventh technique, the protector is positioned relative to the terminal, and the seal member to be placed between the terminal and the protector can be easily positioned. That is, the seal groove for placing the seal member is prevented from shifting position, and the gap between the terminal and the protector can be reliably sealed. [Brief explanation of the drawings]

[0019] [Figure 1] A perspective view of the motor is shown. [Figure 2] An exploded perspective view of the motor is shown. [Figure 3] FIG. 2 shows a perspective view of a bus ring. [Figure 4] FIG. 2 shows a plan view of the conductors that make up the bus ring. [Figure 5] 1 shows a plan view of a conductor plate. [Figure 6] FIG. 10 is a perspective view illustrating the state in which the conductive plate and the conductive wire are joined together. [Figure 7] 1A and 1B are diagrams illustrating the arrangement of coils for each phase. [Figure 8] FIG. 10 is a perspective view illustrating a connection state between a bus ring and a coil. [Figure 9] FIG. 10 is a perspective view illustrating the joining state of the coil and the conductor wire. [Figure 10] 1 shows a cross-sectional view of a conductor plate with a bolt terminal connected thereto. [Figure 11] The external view of the bolt terminal is shown. [Figure 12] 10 is a cross-sectional view of the fixing portion of the bus ring and the cover. [Figure 13] The external appearance of the insulator is shown. [Figure 14] The insulator is shown as viewed in the direction of arrow XIV in FIG. [Figure 15] FIG. 2 is a perspective view showing a state in which a bus ring is attached to an insulator. [Figure 16] An external view of the fixing part of the insulator and cover is shown. [Figure 17] 1A and 1B are cross-sectional views illustrating the characteristics of the insulator. [Figure 18] FIG. 10 is a plan view of the conductors constituting the bus ring of the modified example. [Figure 19] 10 shows the individual conductors that make up a modified bus ring. [Figure 20] 10 shows the individual conductors that make up a modified bus ring. [Figure 21] 10 shows the individual conductors that make up a modified bus ring. [Figure 22] 10 shows the individual conductors that make up a modified bus ring. DETAILED DESCRIPTION OF THE INVENTION

[0020] (motor) A motor 100 will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the motor 100 includes a case 91 that houses a stator, a rotor, and the like, a cover 93 that closes the opening of the case 91, and bolt terminals 76 that supply power to coils (excitation windings) 61-68 that make up the stator. The coils 61-68 will be described later with reference to FIG. 7. The bolt terminals 76 are insulated and protected by insulators 30 and are fixed to the cover 93 with conductor nuts 97. The insulators 30 are an example of protective equipment. The insulators 30 are also fixed to the cover 93 with bolts 95. The motor 100 includes bolt terminals 76 (76U, 76V, 76W), and each bolt terminal 76 supplies power to the coils 61-68 of each phase. The motor 100 is a three-phase motor.

[0021] As shown in FIG. 2, bolt terminals 76 are connected to bus rings 10. As will be described in detail later, bolt terminals 76 for each phase (U phase, V phase, W phase) are connected to the bus rings 10 for the corresponding phase (U phase, V phase, W phase). That is, motor 100 uses three bus rings 10. The three bus rings 10 are arranged side by side (overlapping) in the direction in which output shaft 94 of motor 100 extends, without contacting each other. Bus rings 10 are ring-shaped and are arranged to surround output shaft 94. Cover 93 is fixed to case 91 with bolts 99.

[0022] (Bath Ring) The bus ring 10 will be described with reference to FIGS. 3 to 6. The bus ring 10 is used to connect the coils 61 to 68 of each phase (described later) and to connect the coils 61 to 68 of each phase to the bolt terminals 76 of the corresponding phase. As shown in FIG. 3, the bus ring 10 is formed by a conductor plate 20 and eight conductor wires 2, 4, 6, 8, 12, 14, 16, and 18. The conductor plate 20 is made of copper, and the conductor wires 2 to 18 are enameled copper wires. The conductor plate 20 and the conductor wires 2 to 18 are joined by welding. In other words, the conductor wires 2 to 18 are fixed to the conductor plate 20. A bolt terminal 76 is also fixed to the conductor plate 20 (see also FIG. 2). The bus ring 10 is ring-shaped, but has a gap 9 in a portion of its circumference (a position facing the conductor plate 20 across the central axis 50) (see also FIG. 4). Each of the conductors 2 to 18 has bent portions 2a to 18a at both ends.

[0023] FIG. 4 shows a plan view of the bus ring 10. Note that the conductor plate 20 is not shown in FIG. 4. As shown in FIG. 4, the shapes of the conductor wires 2 to 18 are symmetrical with respect to a straight line 51 passing through a central axis 50 (coaxial with the output shaft 94). Specifically, the shapes of the conductor wires 2, 4, 6, and 8 arranged in a first circumferential direction 42 from the conductor plate 20 toward the gap 9 are symmetrical with the shapes of the conductor wires 12, 14, 16, and 18 arranged in a second circumferential direction 44 opposite to the first circumferential direction 42, with respect to the straight line 51. Note that the conductor wires 2 and 12 have the same shape. That is, seven types of conductor wires are used in the bus ring 10. The straight line 51 is an imaginary line passing through the central axis 50 and connecting the conductor plate 20 (see FIG. 3) and the gap 9. The bent portions 2a, 4a, 6a, 8a, 12a, 14a, 16a, and 18a of the conductor wires 2 to 18 are connected to the conductor plate 20. Moreover, the bent portions 2b, 4b, 6b, 8b, 12b, 14b, 16b, and 18b are connected to the coils 61-68.

[0024] As shown in FIG. 5, the conductor plate 20 includes a flat portion 26 and protruding portions 22 that protrude from the flat portion 26 and are used to join the conductor wires 2 to 18 (bent portions 2a to 18a). The flat portion 26 is also provided with first through holes 27 that guide the conductor wires 2 to 18 to the protruding portions 22 and second through holes 24 for attaching bolt terminals 76. The second through holes 24 are provided at the center of the flat portion 26 in the circumferential direction of the bus ring 10 (see FIG. 3). The second through holes 24 are an example of a connecting portion. Four first through holes 27 are provided in a first circumferential direction 42 relative to the second through holes 24, and four first through holes 27 are provided in a second circumferential direction 44 relative to the second through holes 24. The flat portion 26 is also provided with cutouts 23 and 25 for attaching an insulator 30, which will be described later.

[0025] As shown in Fig. 6, the bent portions 2a to 18a of the conducting wires 2 to 18 pass through the first through-hole 27 and are joined to the protruding portion 22. In the motor 100, the heights of the bent portions 2a to 18a (the protruding height from the surface of the flat plate portion 26) are adjusted to be equal to the protruding height of the protruding portion 22. Specifically, after the bent portions 2a to 18a are passed through the first through-hole 27, the ends of the bent portions 2a to 18a are cut to match the protruding height of the protruding portion 22, thereby adjusting the heights of the bent portions 2a to 18a. After the height adjustment, the bent portions 2a to 18a are joined to the protruding portion 22 by welding.

[0026] The arrangement of coils 61-68 will be described with reference to FIG. 7. Coils 61-68 are housed in case 91 and arranged around central axis 50. As described above, motor 100 is a three-phase motor and includes eight U-phase coils 61U-68U, eight V-phase coils 61V-68V, and eight W-phase coils 61W-68W. Each of coils 61-68 is made of copper. That is, conductor plate 20 and coils 61-68 are made of the same material. Adjacent coils 61-68 are arranged at 15° intervals around central axis 50. Furthermore, one V-phase coil 61V-68V and one W-phase coil 61W-68W are arranged between adjacent U-phase coils 61U-68U. That is, adjacent U-phase coils 61U-68U are arranged at 45° intervals around central axis 50. One U-phase coil 61U-68U and one W-phase coil 61W-68W are arranged between adjacent V-phase coils 61V-68V, and adjacent V-phase coils 61V-68V are arranged at 45° intervals around central axis 50. Similarly, one U-phase coil 61U-68U and one V-phase coil 61V-68V are arranged between adjacent W-phase coils 61W-68W, and adjacent W-phase coils 61W-68W are arranged at 45° intervals around central axis 50. Note that "15°" is an example of a first predetermined interval.

[0027] The connection state between the bus ring 10 and each of the coils 61-68 will be described with reference to Fig. 8. In the motor 100, the bus rings 10 for each phase have the same shape, and three bus rings 10 are joined to the corresponding coils 61-68 for each phase. Note that Fig. 8 shows the U-phase, V-phase, and W-phase coils 61-68 together for clarity.

[0028] Regarding U-phase coils 61U-68U, U-phase coil 61U is joined to bent portion 6b of conductor 6 (see also FIG. 4). U-phase coil 62U is joined to bent portion 8b of conductor 8. U-phase coil 63U is joined to bent portion 18b of conductor 18. U-phase coil 64U is joined to bent portion 16b of conductor 16. U-phase coil 65U is joined to bent portion 14b of conductor 14. U-phase coil 66U is joined to bent portion 12b of conductor 12. U-phase coil 67U is joined to bent portion 2b of conductor 2. U-phase coil 68U is joined to bent portion 3b of conductor 4. When joined in this manner, conductor plate 20 is located between U-phase coils 66U, 67U (see FIG. 7).

[0029] Regarding V-phase coils 61V to 68V, V-phase coil 61V is joined to bent portion 2b of conductor 2. V-phase coil 62V is joined to bent portion 4b of conductor 4. V-phase coil 63V is joined to bent portion 6b of conductor 6. V-phase coil 64V is joined to bent portion 8b of conductor 8. V-phase coil 65V is joined to bent portion 18b of conductor 18. V-phase coil 66V is joined to bent portion 16b of conductor 16. V-phase coil 67V is joined to bent portion 14b of conductor 14. V-phase coil 68V is joined to bent portion 12b of conductor 12. When joined in this manner, conductor plate 20 is located between V-phase coils 61V and 68V (see FIG. 7).

[0030] Regarding W-phase coils 61W to 68W, W-phase coil 61W is joined to bent portion 14b of conductor 14. W-phase coil 62W is joined to bent portion 12b of conductor 12. W-phase coil 63W is joined to bent portion 2b of conductor 2. W-phase coil 64W is joined to bent portion 4b of conductor 4. W-phase coil 65W is joined to bent portion 6b of conductor 6. W-phase coil 66W is joined to bent portion 8b of conductor 8. W-phase coil 67W is joined to bent portion 18b of conductor 18. W-phase coil 68W is joined to bent portion 16b of conductor 16. When joined in this manner, conductor plate 20 is located between W-phase coils 62W and 63W (see FIG. 7).

[0031] As described above, in the U-phase, conductor plate 20 is located between U-phase coils 66U and 67U, in the V-phase, conductor plate 20 is located between V-phase coils 61V and 68V, and in the W-phase, conductor plate 20 is located between W-phase coils 62W and 63W. Therefore, bolt terminals 76 (76U, 76V, 76W) fixed to conductor plate 20 are arranged at 75° intervals around central axis 50 (see also FIG. 2 ). “75°” is an example of an integer multiple (5 times) of the first predetermined interval (15°). Note that, as described above, bus rings 10 for each phase have the same shape, and bus rings 10 are formed using seven types of conductor wire. Therefore, motor 100 can form 24 electric circuits by using seven types of conductor wire.

[0032] The joining state of coils 61-68 and conductors 2-18 will be described with reference to FIG. 9. FIG. 9 shows the joining state of U-phase coil 61U and conductor 6. A connection portion 69 for joining to bus ring 10 (conductor 6) is provided at the end of U-phase coil 61U. In motor 100, the length of connection portion 69 and the height of bent portion 6b of conductor 6 are adjusted to be equal. Specifically, U-phase bus ring 10 is placed in a predetermined position, and the end of connection portion 69 or bent portion 6b is cut so that the end face of connection portion 69 and the end face of bent portion 6b are positioned on the same plane, and the length of connection portion 69 and the height of bent portion 6b are adjusted. After adjusting the length of connection portion 69 and the height of bent portion 6b, connection portion 69 and bent portion 6b are joined by welding. Although not described, U-phase coils 61U-68U, V-phase coils 61V-68V and W-phase coils 61W-68W are all provided with connecting portions 69 which are joined to the corresponding bent portions 2b-18b described above.

[0033] (Fixing the bus ring and bolt terminal) The state in which bus ring 10 and bolt terminal 76 are fixed will be described with reference to Figures 10 and 11. Note that Figure 10 shows only a portion of conductor plate 20 of bus ring 10. Also, Figure 10 shows a simplified shape of bolt terminal 76.

[0034] As shown in FIG. 10 , a clinching stud bolt 70 is attached to the second through hole 24 of the conductor plate 20. The clinching stud bolt 70 has a head 72 and a shank 74. The size of the head 72 is larger than that of the second through hole 24, and the size of the shank 74 is smaller than that of the second through hole 24. A male thread is formed on the outer periphery of the shank 74. A hole 77 is formed in the bolt terminal 76. A female thread is formed on the wall surface (inner wall surface) of the hole 77. The bolt terminal 76 is fixed to the bus ring 10 (conductor plate 20) by fastening the shank 74 (male thread) of the clinching stud bolt 70 to the hole 77 (female thread) of the bolt terminal 76. The size of the bolt terminal 76 (outer diameter of the portion where the hole 77 is formed) is larger than that of the second through hole 24. Therefore, the conductor plate 20 is sandwiched between the head 72 of the clinching stud bolt 70 and the end of the bolt terminal 76.

[0035] As shown in Figure 11, the bolt terminal 76 includes a fixing portion 82 that fixes the bolt terminal 76 to the conductor plate 20, a seal arrangement portion 80 for arranging a seal member 87 (described later), and a male thread portion 78 for attaching a conductor nut 97 (see Figure 1). The fixing portion 82 is provided with the hole 77 described above. The fixing portion 82 also has a two-face width 84 formed by cutting out a portion of its outer periphery in the circumferential direction. The two-face width 84 is used to grip and rotate the bolt terminal 76 when fixing the bolt terminal 76 to the conductor plate 20. A step 86 for positioning the seal member 87 is provided between the fixing portion 82 and the seal arrangement portion 80.

[0036] (fixing the bus ring and cover) With reference to FIG. 12 , the state in which the bus ring 10 and the cover 93 are fixed will be described. In the motor 100, the bus ring 10 is not directly fixed to the cover 93; instead, the bus ring 10 and the cover 93 are fixed together by fixing the bolt terminals 76 to the cover 93. The bolt terminals 76 are fixed to the cover 93 using a resin insulator 30. As will be described in detail later, the insulator 30 is fixed to the bus ring 10 (conductor plate 20). The insulator 30 has a through hole 31 and surrounds a portion of the bolt terminal 76. Specifically, the fixing portion 82 and the seal placement portion 80 of the bolt terminal 76 are located within the through hole 31 (see also FIG. 11 ). A portion of the insulator 30 passes through an opening 93a provided in the cover 93. In the portion surrounded by the dashed line 3, a gap is provided between the opening 93a and the insulator 30. A gap is provided between opening 93a and insulator 30 to absorb any misalignment between the mounting position of bus ring 10 (ie, the position of bolt terminal 76) and opening 93a.

[0037] The bus ring 10 is fixed to the cover 93 by fastening a conductor nut 97 to a bolt terminal 76 (male thread portion 78). Specifically, the conductor nut 97 is fastened to the bolt terminal 76, and the insulator 30 is pressed against the outer surface of the cover 93, thereby fixing the bus ring 10 to the cover 93. A power line terminal 85 of an external power supply (not shown) is fixed to the bolt terminal 76. The power line terminal 85 is fixed to the bolt terminal 76 by fastening a terminal fixing nut 83 to the bolt terminal 76 (male thread portion 78) and sandwiching the power line terminal 85 between the conductor nut 97 and the terminal fixing nut 83. A washer 81 is disposed between the conductor nut 97 and the insulator 30. The washer 81 distributes the force applied from the conductor nut 97 to the insulator 30 (increasing the pressure-receiving area of ​​the insulator 30) and suppresses deformation of the insulator 30.

[0038] As will be described in detail later, the diameter of the through hole 31 is not constant, but is partially smaller. In the insulator 30, the diameter of the through hole 31 is small in the portion surrounded by the dashed line 5, and in this portion there is almost no gap between the through hole 31 and the bolt terminal 76 (the fixing portion 82 in FIG. 11 ) (the fixing portion 82 is fitted into the through hole 31). The portion surrounded by the dashed line 5 determines the position of the insulator 30. In addition, a seal member 87 is arranged between the fixing portion 82 and the washer 81 (seal arrangement portion 80). By fitting a portion of the fixing portion 82 into the through hole 31, it is possible to prevent the seal member 87 from shifting out of position. The size of the insulator 30 located on the outer side of the cover 93 is larger than the size of the opening 93a. A seal member 89 is arranged between the outer surface of the cover 93 and the insulator 30, sealing the interior and exterior of the motor 100.

[0039] (insulator) The insulator 30 will be described with reference to FIGS. 13 to 17. As shown in FIGS. 13 and 14, the insulator 30 includes a bolt terminal insertion portion 35, a fixing bolt insertion portion 32, and two anti-rotation portions 34. A through hole 31 is provided in the bolt terminal insertion portion 35, and a bolt terminal 76 passes through the through hole 31 (see also FIG. 12). A through hole 36 is provided in the fixing bolt insertion portion 32, and a bolt 95 passes through the through hole 36 (see also FIG. 1). The central axis of the fixing bolt insertion portion 32 (through hole 36) is offset from the central axis of the bolt terminal insertion portion 35 (through hole 31). The two anti-rotation portions 34 protrude from the end face of the bolt terminal insertion portion 35 and are provided outside the through hole 31. The anti-rotation portions 34 are provided symmetrically with respect to the center of the through hole 31.

[0040] 15 , insulator 30 is attached to conductor plate 20 (bus ring 10) by inserting anti-rotation portions 34 into notches 23 and 25 of conductor plate 20. Inserting anti-rotation portions 34 into notches 23 and 25 prevents insulator 30 and conductor plate 20 (bus ring 10) from rotating relative to each other.

[0041] As shown in FIG. 16 , the insulator 30 is fixed to the cover 93 with the bolt 95. As described above, the central axis of the fixing bolt insertion portion 32 is offset from the central axis of the bolt terminal insertion portion 35. Therefore, by fixing the insulator 30 to the cover 93 with the bolt 95, it is possible to prevent the insulator 30 from shifting in position (rotating around the bolt terminal 76). Furthermore, as described above, by inserting the anti-rotation portions 34 into the cutouts 23 and 25, the conductor plate 20 (bus ring 10) does not shift in position (rotate) relative to the insulator 30. Therefore, by fixing the insulator 30 to the cover 93 with the bolt 95, it is possible to prevent the conductor plate 20 (bus ring 10) from shifting in position (rotating).

[0042] The features of the insulator 30 will be described with reference to Figure 17. In Figure 17, the shapes (sizes, etc.) of the various characteristic parts are exaggerated (shown larger than they actually are) to clarify the features of the insulator 30. Also, in Figure 17, the fixing bolt insertion portion 32 (see Figure 13) is not shown.

[0043] As shown in FIG. 17 , an attachment portion 46 is provided at one end of the bolt terminal insertion portion 35, and a rotation prevention portion 34 is provided at the other end. The through-hole 31 communicates from the surface of the attachment portion 46 (the surface exposed to the outside of the motor 100) to the other end of the bolt terminal insertion portion 35. The size of the attachment portion 46 is larger than the size of the opening 93a of the cover 93 and is located outside the cover 93 (see also FIG. 12 ). A washer seat 41 for accommodating a washer 81 is formed on the surface of the attachment portion 46. The washer seat 41 is a circular recess formed on the surface of the attachment portion 46. In addition, a seal groove 43 for accommodating a seal member 87 is formed in the attachment portion 46, adjacent to the washer seat 41. The diameter of the seal groove 43 is smaller than the diameter of the washer seat 41. The seal groove 43 is a circular recess formed in part of the washer seat 41. A seal groove 45 for locating a seal member 89 is formed in the mounting portion 46 (the surface that comes into contact with the cover 93).

[0044] The seal groove 43 is followed by the fitting portion 40, where the diameter of the through hole 31 is smallest. At the fitting portion 40, the gap between the bolt terminal 76 and the insulator 30 is equal to or smaller than a predetermined value, restricting misalignment of the bolt terminal 76. Specifically, at the fitting portion 40, the bolt terminal 76 fits into the insulator 30 (through hole 31) (the area surrounded by dashed line 5 in FIG. 12 ). In addition, a sloped portion 47 is provided from the fitting portion 40 toward the other end of the bolt terminal insertion portion 35, where the diameter of the through hole 31 increases. Therefore, the diameter of the through hole 31 gradually increases from the fitting portion 40 toward the other end of the bolt terminal insertion portion 35. Therefore, the bolt terminal 76 fits into the insulator 30 (through hole 31) only at the fitting portion 40, and a small gap is provided between the bolt terminal 76 and the insulator 30 in other areas.

[0045] (Advantages of Motor 100) The advantages of the motor 100 will be described. As described above, the motor 100 has a bus ring structure formed using three bus rings 10. The bus ring 10 for each phase (U phase, V phase, and W phase) is formed by a conductor plate 20 and eight conductors 2, 4, 6, 8, 12, 14, 16, and 18. The bus rings 10 for each phase have the same shape, and are positioned by corresponding bolt terminals 76. Therefore, for example, no fixing members are required to maintain the gaps between the bus rings 10 for each phase. By using the bus rings 10, the number and types of parts required to form the bus ring design can be reduced.

[0046] (Modification of bus ring) 18 to 22, bus ring 210 will be described. Bus ring 210 is a modified version of bus ring 10, and the shapes of conductors 202, 204, 206, 208, 212, 214, 216, and 218 differ from those of conductors 2, 4, 6, 8, 12, 14, 16, and 18 of bus ring 10. More precisely, the shapes of conductors 202 and 212 are the same as those of conductors 2 and 12 (as described above, conductors 2 and 12 have the same shape). Components of bus ring 210 that have substantially the same functions as those of bus ring 10 are designated by reference numerals with the same last two digits as those designated for bus ring 10, and descriptions thereof may be omitted (also see FIGS. 3 and 4 for comparison). Note that FIG. 18 does not show conductor plate 20.

[0047] As shown in FIG. 18 , bus ring 210 is formed by conductors 202 to 218. In bus ring 210, conductors 202 and 212, conductors 204 and 214, conductors 206 and 216, and conductors 208 and 218, which are arranged symmetrically with respect to line 51, have the same shape. That is, in bus ring 210, conductors 202, 204, 206, and 208 arranged in first circumferential direction 42 have the same shape as conductors 212, 214, 216, and 218 arranged in second circumferential direction 44. Therefore, bus ring 210 can be formed by using four types of conductors. Bus ring 210 can reduce the number of component types compared to bus ring 10. By using four types of conductors, bus ring 210 can form 24 electrical paths. The shapes of conductors 202 to 218 will be described in detail below with reference to FIGS. 19 to 22 . In each drawing, (A) shows the conductors 202 to 218 observed from the direction of the central axis 50, and (B) shows the conductors 202 to 218 observed from a direction perpendicular to the central axis 50.

[0048] 19, the shapes of the conductors 202 and 212 are symmetrical with respect to the center 52 in the longitudinal direction. That is, the shape of the conductors 202 and 212 from the center 52 toward the bent portion 202a (212a) is the same as the shape of the conductors 202 and 212 from the center 52 toward the bent portion 202b (212b). Therefore, the same conductor as the conductor 202 can be used as the conductor 212.

[0049] 20, the shapes of the conductors 204, 214 are symmetrical with respect to the center 54 in the longitudinal direction. That is, the shape of the conductors 204, 214 from the center 54 toward the bent portion 204a (214a) is the same as the shape of the conductors 204, 214 from the center 54 toward the bent portion 204b (214b). Therefore, the same conductor as the conductor 204 can be used as the conductor 214.

[0050] As shown in FIG. 21 , the shapes of the conductors 206, 216 are symmetrical with respect to the center 56 in the longitudinal direction. That is, the shape of the conductors 206, 216 from the center 56 toward the bent portion 206a (216a) is the same as the shape of the conductors 206, 216 from the center 56 toward the bent portion 206b (216b). Therefore, the same conductor as the conductor 206 can be used as the conductor 216. However, the bent portion 206a that is joined to the conductor plate 20 in the conductor 206 is joined to the connection portion 69 of the coil in the conductor 216 (i.e., is used as the bent portion 216b). Furthermore, the bent portion 206b that is joined to the connection portion 69 of the coil in the conductor 206 is joined to the conductor plate 20 in the conductor 216 (i.e., is used as the bent portion 216a).

[0051] As shown in FIG. 22 , the shapes of the conductors 208 and 218 are symmetrical with respect to the center 58 in the longitudinal direction. That is, the shape of the conductors 208 and 218 from the center 58 toward the bent portion 208a (218a) is the same as the shape of the conductors 208 and 218 from the center 58 toward the bent portion 208b (218b). Therefore, the same conductor as the conductor 208 can be used as the conductor 218. However, the bent portion 208a that is joined to the conductor plate 20 in the conductor 208 is joined to the connection portion 69 of the coil in the conductor 218 (i.e., is used as the bent portion 218b). Furthermore, the portion 208b that is joined to the connection portion 69 of the coil in the conductor 208 is joined to the conductor plate 20 in the conductor 218 (i.e., is used as the bent portion 218a).

[0052] (Other embodiments) In the above embodiment, an example was described in which the conductor wire was an enameled conductor wire. However, the conductor wire may be a bare conductor wire, a processed metal strip, or the like. In the motor disclosed in this specification, the bus rings of each phase that make up the bus ring structure are positioned by bolt terminals and are non-contact with each other. Therefore, in the motor disclosed in this specification, the conductor wire surface does not need to be insulating.

[0053] In the above embodiment, the conductive plates and the coil are made of copper, but the conductive plates and the coil may be made of other metal materials such as aluminum as long as they are made of the same material.

[0054] In the above embodiment, a motor having eight coils for each phase (24 coils in total) has been described. However, the number of coils constituting each phase is arbitrary, and the coil pitch (first predetermined interval) between adjacent coils can be adjusted depending on the number of coils. Furthermore, the interval between the bolt terminals for each phase is not limited to 75° and can be changed as needed.

[0055] In the above embodiment, an example has been described in which a protrusion and a first through hole are provided on the conductor plate, a bent portion of the conductor wire passes through the first through hole, and the protrusion and the bent portion are joined together. However, the protrusion and / or the first through hole are not essential components, and the protrusion and / or the first through hole may be omitted as long as the conductor plate has a portion for joining the conductor wire.

[0056] In the above embodiment, the bus rings for each phase have the same shape. However, the bus rings (e.g., conductors) for each phase may have different shapes. Even in this case, the bus rings for each phase are formed of a conductor plate and a conductor, so that fixing parts for fixing the bus rings together can be reduced.

[0057] In the above embodiment, an example was described in which an insulator was used to protect the periphery of the bolt terminal, and a second through-hole for attaching the bolt terminal and a notch for attaching the insulator were provided in the conductor plate. However, the insulator is not necessarily required, and the insulator may be omitted as long as insulation between the bolt terminal and other components is ensured. Furthermore, even when an insulator is used, the notch provided in the conductor plate may be omitted as long as a structure for positioning the bolt terminal is provided. Furthermore, the bolt terminal may be directly joined to the conductor plate by welding or the like. In this case, the second through-hole for attaching the bolt terminal may be omitted.

[0058] In the above embodiment, the insulator is provided with a fitting portion, and the gap between the bolt terminal and the insulator at the fitting portion is set to a predetermined value or less to prevent misalignment of the bolt terminal. However, the fitting portion may be omitted as long as a structure for positioning the bolt terminal is provided. Eliminating the fitting portion simplifies the shape of the insulator.

[0059] Although the embodiments of the present invention have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and variations of the specific examples exemplified above. Furthermore, the technical elements described in this specification or drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the technology exemplified in this specification or drawings simultaneously achieves multiple objectives, and achieving one of these objectives itself has technical utility. [Explanation of symbols]

[0060] 2: Conductor 4: Conductor 6: Conductor 8: Conductor 10: Bus Ring 12: Conductor 14: Conductor 16: Conductor 18: Conductor 20: Conductor plate 24: Connection part (second through hole) 61 to 69: Excitation winding (coil) 75: Terminal (bolt terminal) 94: Motor output shaft 100:Motor

Claims

1. A motor having a bus ring structure formed by a plurality of conductors joined to an excitation winding and a conductor plate, the bus ring structure is formed by arranging bus rings for each phase, which connect the plurality of excitation windings constituting each phase of the motor, side by side in a direction in which an output shaft of the motor extends, the conductor plate is provided with a connection portion to which a terminal to which an external power supply is connected is fixed, One end of the conductor is joined to the conductor plate, The other end of the conductor is joined to the excitation windings arranged at first predetermined intervals around the output shaft.

2. 2. The motor of claim 1, a motor in which the bus rings of each phase are arranged so that the terminals fixed to the conductor plates of a specific phase and the terminals fixed to the conductor plates of other phases are spaced apart at an integer multiple of the first predetermined interval.

3. 3. The motor of claim 2, a gap is provided in the bus ring at a position facing the conductor plate across the output shaft, A motor in which the conductor wires arranged in a first circumferential direction from the conductor plate of the bus ring toward the gap portion and the conductor wires arranged in a second direction opposite to the first circumferential direction from the conductor plate of the bus ring toward the gap portion are the same.

4. 2. The motor of claim 1, The conductor plate has a protrusion for joining one end of the conductor wire, and a first through hole for guiding the conductor wire to the protrusion.

5. 5. A motor according to any one of claims 1 to 4, A motor in which the bus rings of each phase have the same shape.

6. 2. The motor of claim 1, Furthermore, an insulating protector is provided to surround and protect the terminal, The conductor plate has a second through hole for attaching the terminal and a notch for attaching the protector.

7. 7. The motor of claim 6, The protector has a fitting portion that regulates positional deviation of the terminal by keeping a gap between the protector and the terminal equal to or smaller than a predetermined value.

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