Motor

Abstract

A motor according to one aspect of the present disclosure comprises: a rotor having a plurality of magnets arranged along a circumferential direction; a stator in which a plurality of coils having respective end parts of a winding start and a winding end are arranged along the circumferential direction, and which faces the rotor in an axial direction; a circuit board having a drive circuit; and a guide member which guides at least a part of the end parts of the plurality of coils to the circuit board. The guide member has: an introduction part into which the end parts of the coils are introduced; a groove part through which the end parts are inserted, and which guides the end parts from the introduction part to the circuit board; and an introduction part which is formed by removing a part of a wall part on one side among wall parts constituting the groove part, and which introduces the end parts of the coils into the groove part.

Description

Motor

[0001] This disclosure relates to a motor. This application claims priority based on Japanese Patent Application No. 2024-187485 filed in Japan on October 24, 2024, and Japanese Patent Application No. 2025-004073 filed in Japan on January 10, 2025, and incorporates the content herein by reference.

[0002] Conventionally, in an axial flux motor in which a stator having a plurality of coils and a rotor having a plurality of magnets face each other axially inside a housing, a motor in which a plurality of coils are supplied with power via busbars has been used. For example, a motor having a total of four busbars for each of the U-phase, V-phase, and W-phase wirings and for neutral wire connection has been proposed (see, for example, Patent Document 1).

[0003] Japanese Unexamined Patent Application Publication No. 2023-078449

[0004] In the above prior art, since the connection area between the ends of the coils and the busbars increases, the size of the busbar unit for housing the busbars increases. For this reason, there is little room to arrange other structures in the space inside the busbar unit, etc., and there is a problem that it becomes difficult to miniaturize the motor.

[0005] Therefore, this disclosure provides a technique for miniaturizing a motor. <了

[0006] A motor according to one aspect of this disclosure includes a rotor having a plurality of magnets arranged along the circumferential direction, a stator in which a plurality of coils each having a start end and an end end are arranged along the circumferential direction and face the rotor axially, a circuit board having a drive circuit, and a guide member for guiding at least a part of the ends of the plurality of coils to the circuit board. The guide member has an introduction portion for introducing the ends of the coils, a groove portion through which the ends are inserted and guided from the introduction portion to the circuit board, and an introduction portion formed by removing a part of one side wall portion of the wall portions constituting the groove portion for introducing the ends of the coils into the groove portion.

[0007] According to this disclosure, the motor can be miniaturized.

[0008] Figure 1 shows an example of the configuration of a motor according to the first embodiment. Figure 2 shows an example of the configuration of a motor according to the first embodiment. Figure 3 shows an example of the configuration of a guide member according to the first embodiment. Figure 4 shows an example of the configuration of a guide member according to the first embodiment. Figure 5 shows an example of the configuration of an introduction section according to the first embodiment. Figure 6 shows an example of the configuration of a guide member according to the first embodiment. Figure 7 shows an example of the configuration of a housing according to the first embodiment. Figure 8 shows an example of the configuration of a guide member according to the second embodiment of this disclosure. Figure 9 shows another example of the configuration of a guide member according to the second embodiment of this disclosure. Figure 10 shows another example of the configuration of a motor according to the third embodiment of this disclosure. Figure 11 shows another example of the configuration of a motor according to the third embodiment of this disclosure. Figure 12 shows another example of the configuration of a motor according to the fourth embodiment of this disclosure. Figure 13 shows an example of a method for manufacturing a motor according to the fourth embodiment of this disclosure.

[0009] Embodiments of the present disclosure will be described in detail below with reference to the drawings. The description will be in the following order. In each of the following embodiments, the same parts will be denoted by the same reference numerals, and redundant descriptions will be omitted. 1. First Embodiment 2. Second Embodiment 3. Third Embodiment 4. Fourth Embodiment

[0010] (1. First Embodiment) (Motor) Figure 1 is a diagram showing an example of the configuration of a motor according to the first embodiment. The same figure is a cross-sectional view showing an example of the configuration of the motor 1 according to the present disclosure. The motor 1 comprises an upper housing 22, a lower housing 21, a stator 30 (stators 30a and 30b), a rotor 40, a shaft 50, a guide member 60, a circuit board 80, and an under cover 23. The motor 1 according to the embodiment is an axial flux motor in which the rotor 40 and the stator 30 face each other in the axial direction inside the upper housing 22 and the lower housing 21. For convenience, the motor 1 is shown upside down in Figure 1.

[0011] In this disclosure, "axial direction" refers to the direction along the rotation axis of the motor 1. In this disclosure, "circumferential direction" refers to the circumferential direction of a circle centered on the rotation axis of the motor 1, and "radial direction" refers to the radial direction of a circle centered on the rotation axis of the motor 1.

[0012] The rotor 40 is rotatably supported inside the motor 1. The rotor 40 comprises a roughly disc-shaped main body 41 and a plurality of magnets 42. The main body 41 is made of a non-magnetic material such as aluminum or resin, but is not limited to these, and may be made of a soft magnetic material such as electromagnetic steel sheet or silicon steel sheet.

[0013] Multiple magnets 42 are arranged in a line along the circumferential direction on the outer circumference of the main body 41. The multiple magnets 42 can be arranged, for example, so that they are equally spaced from each other in the circumferential direction. The multiple magnets 42 are arranged so that, for example, the north pole and south pole are exposed from both axial surfaces of the main body 41. In addition, adjacent magnets 42 have different exposed magnetic poles.

[0014] The shaft 50 is fixed to the radially inner side of the main body 41 of the rotor 40.

[0015] The stator 30 is positioned opposite the rotor 40 in the axial direction. The stator 30 comprises a substantially annular body portion 31, a plurality of teeth 34, and a plurality of coils 32.

[0016] The teeth 34 protrude from one axial side surface of the main body 31 to the axial side. Multiple teeth 34 are arranged in a line along the circumferential direction on the main body 31. For example, the multiple teeth 34 are arranged so that they are equally spaced from one another in the circumferential direction.

[0017] The multiple teeth 34 are arranged such that, for example, when viewed from the axial direction, at least a portion of them overlap with the multiple magnets 42 located on the rotor 40. The main body 31 and the multiple teeth 34 are made of a soft magnetic material such as electromagnetic steel sheet or silicon steel sheet.

[0018] The coil 32 is formed, for example, by winding a conductive wire, which has a conductive core, around the teeth 34. The coil 32 has a starting end and an ending end. The coil 32 may also be configured such that a pre-wound bobbin coil is fitted onto the teeth 34.

[0019] Thus, in the stator 30 according to this embodiment, since the coil 32 is wound around teeth 34 that protrude along the axial direction, the magnetic flux generated by the stator 30 according to this embodiment is oriented in the axial direction.

[0020] In the motor 1 according to this embodiment, the two stators 30a and 30b are arranged to sandwich the rotor 40 along the axial direction, and the magnetic flux generated by each stator 30a and 30b is directed toward the rotor 40. Thus, the motor 1 is an axial flux motor. The motor 1 also has a double stator structure in which the two stators 30a and 30b sandwich the rotor 40.

[0021] The circuit board 80 is a board on which a drive circuit that supplies drive current to the coil 32 of the stator 30 is arranged.

[0022] The guide member 60 guides the ends of the multiple coils 32 to the circuit board 80. Details of the configuration of the guide member 60 will be described later.

[0023] The upper housing 22 and the lower housing 21 are also referred to as the motor housing. The upper housing 22 houses the rotor 40 and the stators 30a and 30b. The lower housing 21 is cylindrical with a bottom and houses the guide member 60 and the circuit board 80. The under cover 23 closes the opening of the lower housing 21. In this way, the motor 1 is constructed by connecting the upper housing 22 and the lower housing 21. By integrating the motor section, including the rotor 40 and the stators 30a and 30b, with the drive circuit board 80, the motor 1 can be made smaller. This makes it possible to increase the torque density of the motor 1.

[0024] Furthermore, despite having a double stator structure, the motor 1 has a guide member 60 positioned only on the side of one stator (stator 30a). This allows for further miniaturization of the motor 1. Thus, the motor 1 can be miniaturized while achieving overall high torque density. Also, because the motor 1 is small and has a flat shape, it is suitable for application in drones, for example.

[0025] Figure 2 is a diagram showing an example of the configuration of a motor according to the first embodiment. This figure shows an example of the configuration of motor 1. This figure is a configuration diagram of motor 1 as seen from the side of the circuit board 80, excluding the under cover 23.

[0026] A guide member 60 is positioned above the lower housing 21. The guide member 60 in the figure is shown as an example of a substantially annular shape. The circuit board 80 is housed inside the guide member 60. A heat dissipation member 83 is positioned adjacent to the circuit board 80. This heat dissipation member 83 cools the components mounted on the circuit board 80. The heat dissipation member 83 is positioned between the circuit board 80 and the under cover 23 (not shown), and cools the components mounted on the circuit board 80 by releasing the heat to the under cover 23. The heat dissipation member 83 can be made of, for example, a sponge-like graphite.

[0027] The coils 32 of the stator 30 receive three-phase drive currents, U-phase, V-phase, and W-phase, supplied from the circuit board 80. Therefore, the multiple coils 32 of the stator 30 are divided into U-phase, V-phase, and W-phase, and each is connected to the circuit board 80 by different wiring. The circuit board 80 and the coils 32 are connected by wirings 71, 72, and 73. Wirings 71, 72, and 73 can correspond to the W-phase, V-phase, and U-phase, respectively. For example, a coil 32 corresponding to the U-phase has one end (start and end) forming wiring 73, and the other end connected to the neutral wire. A coil 32 corresponding to the V-phase has one end (start and end) forming wiring 72, and the other end connected to the neutral wire. A coil 32 corresponding to the W-phase has one end (start and end) forming wiring 71, and the other end connected to the neutral wire. Note that a busbar (not shown) corresponds to the neutral wire. For simplicity, the ends that constitute wiring 71 to 73 and are connected to the U-phase, V-phase, and W-phase terminals of the circuit board will be referred to as one end. The end connected to the neutral wire will be referred to as the other end. Motor 1 has two stators 30a and 30b. One end and the other end are drawn out from the coils 32 of each of these stators 30a and 30b. The two one ends of each coil 32 are bundled together to constitute wiring 71 to 73. The two other ends of each coil 32 are bundled together and connected to the neutral wire.

[0028] The guide member 60 guides the wiring 71 to 73 from the vicinity of the coil 32 to the vicinity of the terminals on the circuit board 80. That is, the guide member 60 guides one end of the coil 32 to the vicinity of the terminals on the circuit board 80. In this way, the guide member 60 guides at least a portion of the ends of the multiple coils 32 to the circuit board 80. As shown in the figure, crimp terminals 76 are connected to the ends of the wiring 71 to 73 on the circuit board 80 side. At this time, the respective ends of the multiple coils 32 are bundled together and crimped to the sleeve of the crimp terminal 76. This crimp terminal 76 is connected to the terminal on the circuit board 80 side, for example, by screw fastening. This provides high connection reliability. Note that methods other than screw fastening may be applied to connect the crimp terminal 76.

[0029] A busbar is further arranged on the guide member 60. The detailed configuration of the guide member 60 will be explained using Figures 3 and 4.

[0030] Figure 3 shows an example of the configuration of a guide member according to the first embodiment. This figure shows an example of the configuration of the guide member 60 and depicts the part of the guide member 60 shown in Figure 3. The guide member 60 has grooves 61 to 63 for guiding the wiring 71 to 73. The guide member 60 also has a groove 64 for arranging a busbar. The grooves 61 to 64 in the figure are arranged in the radial direction. The guide member 60 can also be configured in a shape that allows for the arrangement of grooves 61, etc. Specifically, the guide member 60 is configured to include at least an arc-shaped region along the circumferential direction. The guide member 60 can also be made of, for example, resin. Note that groove 64 is an example of the "second groove" of this disclosure.

[0031] Figure 4 shows an example of the configuration of a guide member according to the first embodiment. This figure is a schematic diagram representing an example of the configuration of the guide member 60, and is a simplified representation of the guide member 60. The figure shows grooves 61 to 63 for guiding the wiring 71 to 73, and a groove 64 where a bus bar is arranged. A bus bar 77 is shown in the groove 64. The bus bar 77 can be made of a metal plate. Plate-shaped tabs 78 for connecting the wiring from the coil 32 are arranged on the bus bar 77. The bus bar 77 in the figure shows an example where eight tabs 78 are arranged.

[0032] The guidance of wiring by the guide member 60 will be explained using the groove 61 as an example. The groove 61 guides the wiring 71 from the inlet 101, which is the entrance near the coil 32, to the outlet 102, which is the exit near the circuit board 80. This can be done by inserting the wiring 71 into the groove 61. The dotted arrows in the figure show how the wiring is guided.

[0033] The bus bar 77 can be positioned in the groove 64 formed on the radially inner side of the guide member 60.

[0034] Furthermore, the grooves 61 to 63 for the wiring 71 to 73 can be arranged in the order of the U-phase, V-phase, and W-phase terminals on the circuit board 80. More specifically, the inlet 101 and outlet 102 of each groove 61 to 63 can be arranged circumferentially offset in the order of the U-phase, V-phase, and W-phase terminals. This allows the wiring 71 to 73 to be guided without crossing each other.

[0035] Although not shown in the diagram, the wiring from the coil 32 can also be introduced into the groove 61 or the like from the middle of the groove 61 or the like.

[0036] Figure 5 is a diagram showing an example of the configuration of the introduction section according to the first embodiment. This figure is a schematic diagram showing an example of the configuration of the introduction section 101 of the guide member 60. The introduction sections 101a and 101b are shown in the figure. The black lines in the figure represent the wiring 71 and wiring 74 from the coil 32. Here, wiring 74 is the wiring corresponding to the other end connected to the neutral wire.

[0037] The introduction section 101a is an introduction section positioned at the entrance of the grooves 61 to 63. The introduction section 101b is an introduction section positioned in the middle of the grooves 61 to 63. The introduction sections 101a and 101b for introducing the wiring 71 into the groove 61 are formed by removing a portion of the wall portion that constitutes the groove 61. The introduction sections 101a and 101b for introducing the wiring 72 into the groove 62 are formed by removing a portion of the wall portion that constitutes the grooves 61 and 62. The introduction sections 101a and 101b for introducing the wiring 73 into the groove 63 are formed by removing a portion of the wall portion that constitutes the grooves 61, 62, and 63. The introduction sections 101a and 101b shown in the figure represent the configurations when they are positioned at the entrance of the groove 61 and in the middle of the groove 62, respectively. In this embodiment, introduction portions 101a and 101b are formed by removing a wall portion to open the radially outer side in order to introduce the wiring 71 to 73 from the radially outer side. Thus, the introduction portion 101 can be formed by removing a part of one side of the wall portion that constitutes the groove portion 61, etc. By providing introduction portions 101a and 101b in the groove portions 61 to 63 and inserting the wiring 71 to 73 through them, confusion of U phase, V phase and W phase can be avoided in the manufacturing process, and wiring errors can be suppressed.

[0038] Furthermore, a notch 66 is provided in the introduction section 101a. This notch 66 is formed by cutting out a portion of the side surface in the direction in which the wiring 71 is introduced from one of the walls constituting the groove section 61. In other words, the notch 66 is formed by cutting out a portion of the side surface in the direction in which the end of the coil 32 is introduced from the wall constituting the groove section 61, etc. This notch 66 guides the wiring 71 in the circumferential direction. By using this configuration in which the wiring 71 is inserted through the notch 66, the detachment of the wiring 71 during the manufacturing process is suppressed. In addition, other introduction sections 101a and 101b, which are not shown, can also have notches 66 provided in the same way.

[0039] Furthermore, the wiring 74 is connected to the tab 78 of the busbar 77. This connection can be made, for example, by soldering. In addition, the guide member 60 in the figure is further provided with a guide section 68 for guiding the wiring 74. As shown in the figure, the guide section 68 is formed by a groove formed on the upper surface of the guide member 60.

[0040] Furthermore, the area on the busbar 77 to which the wiring 74 is connected can be positioned so as not to overlap with the circuit board 80. Specifically, the tab 78 can be positioned so as not to overlap with the circuit board 80. This prevents interference between the tab 78 and the circuit board 80.

[0041] Furthermore, an insulating coating 75 can be placed on the wiring 74. Copper wires with an insulating coating can be used for the wiring 71 to 74. However, the routing portion from the coil 32 to the busbar 77, etc., may be in close proximity to the lower housing 21, etc. For this reason, the coating 75 can be placed to ensure insulation more favorably. The other ends of the two stators 30a and 30b may also be covered with the same coating 75. This coating 75 can be made of an insulating material, for example, a tubular resin. The coating 75 can also be placed on the wiring 71.

[0042] Figure 6 is a diagram showing an example of the configuration of a guide member according to the first embodiment. The same figure is a cross-sectional view showing an example of the configuration of the guide member 60. As described above, grooves 61 to 64 are arranged in the guide member 60. Wiring 71 is arranged in groove 61, wiring 72 is arranged in groove 62, and wiring 73 is arranged in groove 63. A bus bar 77 is also arranged in groove 64. In addition, protrusions 67 that project into the interior of the grooves 61 to 63 can be arranged. These protrusions 67 can be arranged, for example, on the entire groove 61, etc. By arranging the protrusions 67, it is possible to suppress the falling out of the wiring 71, etc. Also, since the wiring 71 can be separated from the upper surface of the guide member 60, it is possible to suppress the occurrence of insulation failure with the wiring 74 connected to the bus bar 77. Furthermore, it is possible to improve the assembly of the wiring 71.

[0043] Further, as shown in the figure, the thickness of the wall portion between the groove portion 63 and the groove portion 64 can be configured to be different from the thickness of the wall portion between the groove portions 61 to 63. Specifically, the thickness w1 of the wall portion between the groove portion 62 and the groove portion 63 can be made smaller than the thickness w2 of the wall portion between the groove portion 63 and the groove portion 64. This is because an insulating coating is disposed on the wiring 71 and the like.

[0044] Further, a protrusion 69 can be disposed on the bottom surface of the guide member 60. The protrusion 69 is fitted into a hole 92 of the lower housing 21 described later.

[0045] FIG. 7 is a diagram showing a configuration example of the housing according to the first embodiment. This figure is a cross-sectional view showing a configuration example of the lower housing 21. This figure shows a portion of the lower housing 21 in FIG. 3. A plurality of holes 91 penetrating in the axial direction are provided on the bottom surface of the lower housing 21 in this figure. One end portion and the other end portion drawn from two adjacent coils 32 inside the coil 32 are inserted into the holes 91. More specifically, for one hole 91, one of the wirings 71 to 73 for inserting into the groove portions 61 to 63 and the wiring 74 for connecting to the bus bar 77 are inserted. Thereby, two types of wirings are inserted into one hole 91. One can be regarded as a wiring connected to the U phase, V phase, and W phase, and the other can be regarded as a wiring connected to the neutral line. Further, in the present embodiment, in all the holes 91, the wiring located on one side in the circumferential direction is defined as the wiring connected to the U phase, V phase, and W phase, and the wiring located on the other side is defined as the wiring connected to the neutral line and inserted. By these means, wiring mistakes in the manufacturing process can be suppressed.

[0046] Further, a hole 92 is further disposed in the lower housing 21. The hole 92 is a hole into which the protrusion 69 of the guide member 60 described above is fitted. Thereby, the positioning of the guide member 60 can be easily performed.

[0047] Further, a guide portion 93 for guiding the wiring 74 described in FIG. 5 can be disposed on the wall portion of the lower housing 21. The guide portion 93 can be constituted by two protrusions formed on the wall portion.

[0048] Note that the configuration of the motor 1 is not limited to this example. For example, either the stator 30a or 30b can be omitted.

[0049] As described above, in the motor 1 of the present disclosure, the connection between the coil 32 and the circuit board 80 is made by the wirings 71 to 73 without using a bus bar. That is, one of the end portions of the coil 32 at the start and end of winding is directly guided to the circuit board 80. Further, by guiding the wirings 71 to 73 to the circuit board 80 by the guide member 60, the wirings 71 to 73 can be arranged in proximity to each other, and the wiring area can be reduced. For this reason, the circuit board 80 can be housed inside the guide member 60, and the motor 1 can be miniaturized (thinned). Also, since the bus bar can be reduced, a connection portion for connecting the bus bar and the end portion of the coil becomes unnecessary, and a space for providing the connection portion becomes unnecessary. Thereby, the motor 1 can be further miniaturized. Furthermore, weight reduction is also possible compared to the configuration in which a bus bar is provided.

[0050] (2. Second Embodiment) A variation of the motor 1 of the first embodiment described above will be described.

[0051] FIG. 8 is a diagram showing a configuration example of the guide member 60 according to the second embodiment of the present disclosure. The upper side of the figure shows the guide member 60 (guide members 60a and 60b) divided into two. Groove portions 61a and 61b are arranged in the guide members 60a and 60b, respectively. The lower side of the figure shows an example of dividing the groove portion in the guide member 60. Divided groove portions 61a and 61b are arranged in the guide member 60 of the figure. The wiring inserted through the groove portion 61a is guided in one direction in the circumferential direction, and the wiring inserted through the groove portion 61b is guided in the other direction in the circumferential direction.

[0052] In this way, by dividing the guide member or groove in the circumferential direction, the total length of the portion of the wiring inserted into the groove is shortened, making the process of inserting the wiring into the groove easier. Furthermore, by dividing the groove, the number of ends inserted into each groove can be divided, separating the ends that are guided in one circumferential direction from the ends that are guided in the other circumferential direction. In this embodiment, there are eight ends each connected to the U-phase, V-phase, and W-phase, but four of them can be guided in one circumferential direction and the remaining four can be guided in the other circumferential direction. This makes it possible to make the guide member even thinner and miniaturize the motor. For convenience, only grooves 61a and 61b corresponding to groove 61 are shown in the figure, but other grooves can be divided and arranged in the same way.

[0053] Figure 9 is a diagram showing another example of the configuration of the guide member 60 according to the second embodiment of the present disclosure. The figure is a cross-sectional view showing an example of the configuration of the guide member 60. The figure shows an example in which the grooves 61 to 63 are formed in the lateral direction (radial direction). The grooves 61 to 63 in the figure are arranged in the axial direction. The upper part of the figure shows an example in which the groove 64 is formed in the lateral direction. The lower part of the figure shows an example in which only the groove 64 is formed in the vertical direction (axial direction).

[0054] The configuration of motor 1, aside from what is described above, is the same as that of motor 1 in the first embodiment, so its explanation will be omitted.

[0055] (3. Third Embodiment) Other variations of the motor 1 of the first embodiment described above will be explained.

[0056] Figure 10 is a diagram illustrating another configuration example of a motor according to the third embodiment of the present disclosure. This diagram illustrates the external appearance of the motor 1. As described above, the motor 1 is configured such that the lower housing 21 is coupled to the upper housing 22, and the under cover 23 is attached to the lower housing 21.

[0057] An opening is formed in the under cover 23 to expose the terminals of the circuit board 80. The opening on the right side of the under cover 23 is used when screwing the crimp terminal 76, as described in Figure 2, to the terminals of the circuit board 80. The opening on the left side of the under cover 23 is used when connecting the power lines 110 and 112 to the two power terminals of the circuit board 80, respectively. A crimp terminal 111 is connected to the end of the power line 110. This crimp terminal 111 is screwed to the power terminal of the circuit board 80. The same applies to the power line 112.

[0058] The power lines 110 and 112 are bundled together to form a harness 120. This harness 120 further includes signal lines for transmitting control signals. The harness 120 is fixed to the under cover 23. In Figure 10, the harness 120 is attached and fixed to the under cover 23 by a mounting member 121. For example, a binding member can be used as the mounting member 121. Alternatively, the harness 120 can be fixed with sheet metal.

[0059] In Figure 10, multiple holes 24 are formed on the side surface of the upper housing 22. Additionally, multiple holes 25 are formed on the side surface of the lower housing 21. These holes 24 and 25 are ventilation holes.

[0060] Figure 11 is a diagram showing another example of the configuration of a motor according to the third embodiment of the present disclosure. The figure is a schematic cross-sectional view of the motor 1. As described above, the rotor 40 and stators 30a and 30b are arranged in the upper housing 22. The guide member 60 and the circuit board 80 are arranged in the lower housing 21. The circuit board 80 in the figure shows an example in which chip components are mounted on both sides. As shown in the figure, the circuit board 80 is screwed to a boss 130 located in the lower housing 21. A heat dissipation member 83 is also arranged between the circuit board 80 and the under cover 23.

[0061] Heat dissipation is achieved by positioning the heat dissipation member 83 to release the heat from the elements of the circuit board 80 to the under cover 23. Furthermore, by forming the holes 24 and 25 described in Figure 10 in the upper housing 22 and lower housing 21, an airflow can be generated inside the motor 1. The inside of the motor 1 can be cooled by utilizing the heat dissipation caused by this airflow. These heat dissipation mechanisms improve the heat dissipation performance of the motor 1 and contribute to miniaturization of the motor 1.

[0062] The configuration of motor 1, aside from what is described above, is the same as that of motor 1 in the first embodiment, so its explanation will be omitted.

[0063] (4. Fourth Embodiment) In the motor 1 of the third embodiment described above, the circuit board 80 was attached to the lower housing 21. In contrast, the motor 1 of the fourth embodiment of this disclosure differs from the motor 1 of the third embodiment in that the circuit board 80 is attached to the under cover 23.

[0064] Figure 12 shows another configuration example of a motor according to the fourth embodiment of the present disclosure. This figure is a schematic cross-sectional view of the motor 1, similar to Figure 11. In the motor 1 shown in this figure, the circuit board 80 is attached to the under cover 23. As shown in the figure, the circuit board 80 is screwed to bosses 131 located on the under cover 23. Also, similar to Figure 11, a heat dissipation member 83 is placed between the circuit board 80 and the under cover 23.

[0065] Figure 13 is a diagram showing an example of a motor manufacturing method according to the fourth embodiment of the present disclosure. The same diagram illustrates the assembly procedure for the motor 1. The motor 1 can be assembled by the following procedure. First, the motor section, consisting of the upper housing 22 and the lower housing 21, is manufactured. Next, the circuit board 80 is attached to the under cover 23 with the heat dissipation member 83 sandwiched in between to form the under cover section. The circuit board 80 can be attached by screwing it to the boss 131 located on the under cover 23. Next, the under cover section is placed on the motor section and wired to the circuit board 80. After that, the under cover section is attached to the motor section. The motor 1 can be assembled by following the above procedure.

[0066] The configuration of motor 1, aside from what is described above, is the same as that of motor 1 in the third embodiment, so its explanation will be omitted.

[0067] The effects described herein are merely illustrative and not limiting, and other effects may also occur. Furthermore, the elements introduced in the above embodiments may be combined as appropriate, provided that they do not contradict each other.

[0068] Furthermore, the present disclosure can take the following configurations: (1) A motor comprising: a rotor having a plurality of magnets arranged in the circumferential direction; a stator having a plurality of coils arranged in the circumferential direction, each having a winding start end and winding end, and facing the rotor in the axial direction; a circuit board having a drive circuit; and a guide member that guides at least a portion of the ends of the plurality of coils to the circuit board, wherein the guide member has: a groove through which the ends are inserted and which guides them to the circuit board; and an introduction portion formed by removing a portion of one side wall of the wall constituting the groove, for introducing the ends of the coils into the groove. (2) The motor according to (1), wherein the introduction portion further has a notch formed by cutting out a portion of the side surface of the wall in the direction in which the ends are introduced. (3) The motor according to (1) or (2), wherein the wall has a projection that protrudes into the interior of the groove on the opening side of the groove. (4) The motor according to any one of (1) to (3), wherein the guide member has a plurality of grooves divided in the circumferential direction. (5) The motor according to any one of (1) to (4), wherein the guide member is divided into a plurality of parts and arranged in the circumferential direction. (6) The motor according to (4) or (5), wherein the ends of the plurality of coils have an end that is guided in one circumferential direction and an end that is guided in the other circumferential direction. (7) The motor according to any one of (1) to (6), wherein the guide member is configured to include at least an arc-shaped region along the circumferential direction. (8) The motor according to (6), wherein the circuit board is arranged radially inward of the guide member. (9) The motor according to any one of (1) to (8), wherein the plurality of coils are arranged for U-phase, V-phase and W-phase, and the guide member has a plurality of grooves corresponding to any one of the U-phase, V-phase and W-phase. (10) The motor according to (9), wherein the plurality of grooves are arranged in a radial or axial direction, and the plurality of ends guided by the plurality of grooves are led to the circuit board in the order of the plurality of grooves.(11) The motor according to (9), wherein one end of the plurality of coils is inserted through the groove, and the guide member further has a busbar to which the other end of the plurality of coils is connected. (12) The motor according to (11), wherein the busbar is positioned in a second groove which is a groove formed radially inward from the groove in the guide member. (13) The motor according to (12), wherein the thickness of the wall between the groove and the second groove is different from the thickness of the wall between the grooves. (14) The motor according to (11), wherein the region in the busbar to which the other end of the plurality of coils is connected is positioned so as not to overlap with the circuit board. (15) The motor according to (11), further comprising a housing having a bottom surface that partitions the space between the stator and the guide member, wherein the bottom surface of the housing is provided with a plurality of holes that penetrate in the axial direction, and one end and the other end drawn from two adjacent coils among the plurality of coils pass through the same hole among the plurality of holes. (16) The motor according to any one of (1) to (15), further comprising an insulating member disposed in the region from the coil to the introduction portion at the end. (17) The motor according to any one of (1) to (16), further comprising a second stator disposed opposite to the side of the rotor opposite to the side facing the stator, wherein a plurality of coils are arranged circumferentially, and the groove further guides the ends of the coils of the second stator.

[0069] 1 Motor 21 Lower housing 22 Upper housing 23 Under cover 24, 25, 91, 92 Holes 30, 30a, 30b Stator 32 Coil 40 Rotor 60, 60a, 60b Guide members 61, 61a, 61b, 62-64 Groove 66 Notch 68, 93 Guide part 67, 69 Protrusion 71-74 Wiring 75 Insulation 77 Busbar 80 Circuit board 83 Heat dissipation member

Claims

1. A motor comprising: a rotor having a plurality of magnets arranged along the circumferential direction; a stator having a plurality of coils arranged along the circumferential direction, each having a winding start end and winding end; a circuit board having a drive circuit; and a guide member for guiding at least a portion of the ends of the plurality of coils to the circuit board, wherein the guide member has a groove through which the ends are inserted and which guides them to the circuit board; and an introduction portion formed by removing a portion of one of the walls constituting the groove, for introducing the ends of the coils into the groove.

2. The motor according to claim 1, wherein the introduction portion further has a notch formed by cutting out a part of the side surface of the wall portion in the direction in which the end portion is introduced.

3. The motor according to claim 1, wherein the wall portion has a projection that protrudes into the interior of the groove portion on the opening side of the groove portion.

4. The motor according to claim 1, wherein the guide member has a plurality of grooves divided in the circumferential direction.

5. The motor according to claim 1, wherein the guide member is divided into a plurality of parts and arranged in the circumferential direction.

6. The motor according to claim 4 or 5, wherein the ends of the plurality of coils have an end guided in one circumferential direction and an end guided in the other circumferential direction.

7. The motor according to claim 1, wherein the guide member is configured to include at least an arc-shaped region along the circumferential direction.

8. The motor according to claim 6, wherein the circuit board is arranged radially inward of the guide member.

9. The motor according to claim 1, wherein the plurality of coils are arranged for each U-phase, V-phase, and W-phase, and the guide member has a plurality of grooves corresponding to any of the U-phase, V-phase, and W-phase.

10. The motor according to claim 9, wherein the plurality of grooves are arranged in a radial or axial direction, and the plurality of ends guided by the plurality of grooves are led to the circuit board in the order of the plurality of grooves.

11. The motor according to claim 9, wherein one end of the plurality of coils is inserted through the groove, and the guide member further has a busbar to which the other end of the plurality of coils is connected.

12. The motor according to claim 11, wherein the busbar is arranged in a second groove which is a groove formed radially inward from the groove in the guide member.

13. The motor according to claim 12, wherein the thickness of the wall between the groove and the second groove is different from the thickness of the wall between the grooves.

14. The motor according to claim 11, wherein the region to which the other ends of the plurality of coils in the busbar are connected is located in a position that does not overlap with the circuit board.

15. The motor according to claim 11, further comprising a housing having a bottom surface that partitions the space between the stator and the guide member, wherein the bottom surface of the housing is provided with a plurality of holes that penetrate in the axial direction, and one end and the other end drawn from two adjacent coils among the plurality of coils pass through the same hole among the plurality of holes.

16. The motor according to claim 1, further comprising an insulating member disposed in the region from the coil to the introduction portion at the end.

17. The motor according to claim 1, further comprising a second stator positioned opposite to the side of the rotor opposite to the stator, wherein a plurality of coils are arranged circumferentially, and the groove further guides the ends of the coils of the second stator.

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