Stator, motor, and blower

Abstract

To provide a technique enabling a conductor constituting a coil to be wound in a well-balanced manner.SOLUTION: A stator 11 used for a motor, includes: a stator core 111; an insulator 112; a coil; and a terminal pin 114. The stator core 111 includes an annular core back and a plurality of teeth. The insulator 112 covers at least one part of the stator core 111. The insulator 112 includes: an annular part 1121; a plurality of first projection parts 1122; and a plurality of second projection parts 1123. The annular part 1121 covers at least one part of the core back, and is positioned with a center axis as a center. The plurality of first projection parts 1122 covers at least one part of the teeth, and projects radially outward from the annular part. The plurality of second projection parts 1123 are provided between the peripherally adjacent first projection parts 1122, respectively, and project radially outward from the annular part 1121 in an amount smaller than the projected amounts of the first projection parts 1122.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a stator, a motor, and a blower. [Background technology]

[0002] Japanese Utility Model Application Publication No. 6-74053 discloses a structure for drawing out the coil ends of a brushless motor. In this drawing out structure, cylindrical coil guides are formed on bosses of insulating plates provided on both axial ends of the stator, and the tips of the cylindrical coil guides abut in a state where they fit exactly inside coil insertion holes formed in a wiring board. The coil ends are passed through and supported by the coil guides and drawn out to the outer surface of the wiring board. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 6-74053 Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration of Japanese Utility Model Application Laid-Open Publication No. 6-74053, the coil guide is provided only at the position where the coil end portion is pulled out. For example, when the number of teeth constituting the coil in the stator is greater than the number of coil end portions pulled out, some teeth have coil guides on both sides in the circumferential direction, and some teeth have coil guides on only one side in the circumferential direction. In the teeth where the coil guide is provided only on one side in the circumferential direction, the left and right shapes in the circumferential direction of the teeth become asymmetric. For this reason, when the conductor is wound around the teeth via the insulating plate to form the coil, there is a risk that the conductor will be wound unbalanced on the left and right sides in the circumferential direction of the tooth. If the conductor constituting the coil is wound unbalanced, the characteristics such as resistance and inductance may become unstable.

[0005] An object of the present invention is to provide a technique that enables well-balanced winding of the conducting wire that constitutes a coil. [Means for solving the problem]

[0006] An exemplary stator of the present invention is a stator used in a motor, and includes a stator core, an insulator, a coil, and a terminal pin. The stator core includes an annular core back surrounding a central axis extending vertically, and a plurality of teeth extending radially outward from the core back. The insulator covers at least a portion of the stator core. The coil is formed by winding a conductor around the teeth via the insulator. The terminal pin extends axially upward from the upper surface of the insulator, and an end of the conductor is connected to the terminal pin. The insulator has an annular portion, a plurality of first protrusions, and a plurality of second protrusions. The annular portion covers at least a portion of the core back and is centered on the central axis. The plurality of first protrusions cover at least a portion of each tooth, and protrude radially outward from the annular portion. The plurality of second protrusions are provided between adjacent first protrusions in the circumferential direction, and protrude radially outward from the annular portion smaller than the first protrusions. A terminal pin is provided on some of the plurality of second protrusions. At least a portion of the radially inner end of the coil is positioned radially inward from an imaginary line connecting the radially outer vertices of two adjacent second protrusions with the first protrusion interposed therebetween, when viewed in a plan view from the axial direction.

[0007] An exemplary motor of the present invention includes the stator described above and a rotor having a magnet radially opposed to the stator.

[0008] An exemplary blower device of the present invention includes the motor described above and an impeller that rotates with the rotor. Effect of the Invention

[0009] According to the exemplary embodiment of the present invention, the conductive wire constituting the coil can be wound in a well-balanced manner. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a blower according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a vertical cross-sectional view of the blower according to the embodiment of the present invention. [Diagram 3] FIG. 3 is a plan view of the stator according to the embodiment of the present invention. [Figure 4] FIG. 4 is an exploded perspective view of the stator shown in FIG. [Diagram 5] FIG. 5 is a schematic diagram showing an enlarged portion of the stator according to the embodiment of the present invention. [Figure 6] FIG. 6 is an enlarged perspective view of the second protrusion and its periphery. [Figure 7] FIG. 7 is a schematic diagram showing an enlarged portion of the stator according to the embodiment of the present invention. [Figure 8] FIG. 8 is an enlarged cross-sectional view of the terminal pin and its surroundings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an exemplary embodiment of the present invention will be described in detail with reference to the drawings. In this specification, the direction parallel to the central axis C of the motor 1 of the blower 100 shown in FIG. 2 is referred to as the "axial direction", the direction perpendicular to the central axis C is referred to as the "radial direction", and the direction along the arc centered on the central axis C is referred to as the "circumferential direction". In this specification, the axial direction is referred to as the up-down direction, and the side on which the circuit board 3 is provided with respect to the impeller 2 is referred to as the up-down direction, and the shapes and positional relationships of the various parts will be described. However, this definition of the up-down direction is not intended to limit the orientation of the stator 11, motor 1, and blower 100 according to the present invention when in use.

[0012] <1. Blower> FIG. 1 is a perspective view of a blower device 100 according to an embodiment of the present invention. FIG. 1 is a view of the blower device 100 as viewed obliquely from below. FIG. 2 is a vertical cross-sectional view of the blower device 100 according to an embodiment of the present invention. The blower device 100 is a centrifugal fan. As shown in FIGS. 1 and 2, the blower device 100 has a motor 1 and an impeller 2. The blower device 100 further has a circuit board 3 and a casing 4.

[0013] (1-1. Motor) The motor 1 is an outer rotor type motor. As shown in Fig. 2, the motor 1 has a stator 11 and a rotor 12. The motor 1 further has a bearing 13 and a bearing holder 14. The stator 11 is an armature that has a plurality of coils 113 and generates magnetic flux in response to a driving current flowing through the coils 113. The stator 11 is annular about a central axis C that extends vertically. Details of the stator 11 will be described later.

[0014] The rotor 12 rotates about a central axis C. The rotor 12 has a magnet 121 that faces the stator 11 in the radial direction. More specifically, the magnet 121 is disposed radially outward of the stator 11. In this embodiment, the magnet 121 has an annular shape centered on the central axis C. However, the magnet 121 may be composed of a plurality of magnet pieces arranged in the circumferential direction.

[0015] The rotor 12 further includes a shaft 122, a rotor holder 123, and a bush 124. The shaft 122 is a columnar member extending in the axial direction centered on a central axis C. The rotor holder 123 is a bottomed, cylindrical member having an opening on the upper surface and extending in the axial direction. A magnet 121 is fixed to the inner peripheral surface of the rotor holder 123. The magnet 121 is fixed to the rotor holder 123 using, for example, an adhesive. The rotor holder 123 has a holder opening 123a penetrating in the axial direction on the bottom wall. The holder opening 123a is centered on the central axis C. The bush 124 is fixed to the lower end of the shaft 122. The bush 124 is fitted into the holder opening 123a and fixed to the rotor holder 123. That is, when the shaft 122 rotates, the rotor holder 123 also rotates.

[0016] The bearings 13 are disposed radially outward of the shaft 122 and rotatably support the shaft 122. In this embodiment, the bearings 13 are ball bearings. There are two bearings 13, and the two bearings 13 are disposed with a gap between them in the axial direction. The type and number of the bearings 13 may be changed. The bearings 13 may be, for example, a sleeve bearing or the like.

[0017] The bearing holder 14 has a cylindrical shape extending in the axial direction. The bearing holder 14 is disposed radially outward of the bearings 13 and holds the bearings 13. In this embodiment, the bearing holder 14 holds two bearings 13. The bearing holder 14 is disposed radially inward of the stator 11 and fixed to the stator 11. The bearing holder 14 is fixed to the stator 11 by, for example, an adhesive or by press fitting.

[0018] In the motor 1, a driving current is supplied to the stator 11, whereby a rotational torque is generated between the magnet 121 and the stator 11. This causes the rotor 12 to rotate relative to the stator 11. In this embodiment, the quality stability of the stator 11 can be improved, and therefore the quality stability of the motor 1 can be improved.

[0019] (1-2. Impeller) The impeller 2 rotates together with the rotor 12. As shown in Fig. 1 and Fig. 2, the impeller 2 has a boss portion 21, a plurality of blade portions 22, a lower shroud 23, and an upper shroud 24. In this embodiment, the boss portion 21, the plurality of blade portions 22, the lower shroud 23, and the upper shroud 24 are a single member. However, at least one of these members 21 to 24 may be a separate member.

[0020] The boss portion 21 has a cylindrical shape extending in the axial direction. The boss portion 21 is disposed radially outward of the rotor holder 123 and fixed to the outer peripheral surface of the rotor holder 123. The boss portion 21 is fixed to the rotor holder 123 by, for example, press fitting or bonding. More specifically, the boss portion 21 has an annular protruding portion that protrudes radially inward at a lower end in the axial direction. This protruding portion does not necessarily have to be provided. The protruding portion makes it possible to place a weight member for balancing, for example.

[0021] The blade portion 22 is disposed radially outward of the boss portion 21 and extends in a direction away from the central axis C. The blade portions 22 are disposed at intervals in the circumferential direction. In detail, the blade portion 22 faces the boss portion 21 in the radial direction with a gap therebetween. However, the blade portion 22 may be connected to the boss portion 21.

[0022] The lower shroud 23 is annular about the central axis C. The lower shroud 23 is disposed radially outward from the boss portion 21 relative to the radial inner ends of the blade portions 22. The upper surface of the lower shroud 23 is connected to the radially outer lower surfaces of each of the blade portions 22. In other words, the lower shroud 23 is connected to radially outer portions of the multiple blade portions 22.

[0023] The upper shroud 24 is annular about the central axis C. A radially inner end of the upper shroud 24 is connected to the outer peripheral surface of the boss portion 21. A radially inner upper surface of each of the blade portions 22 is connected to a lower surface of the upper shroud 24. That is, the upper shroud 24 is connected to radially inner parts of the multiple blade portions 22. The multiple blade portions 22 are connected to the lower shroud 23 and the upper shroud 24.

[0024] (1-3. Circuit board) The circuit board 3 is disposed axially above the stator 11 and is supported by the stator 11. The circuit board 3 is electrically connected to the stator 11. In detail, an electric circuit for supplying a drive current to the coil 113 is formed on the circuit board 3. The circuit board 3 has a board hole 3a penetrating in the axial direction at the center. A bearing holder 14 is disposed radially inward of the board hole 3a. The bearing holder 14 passes through the board hole 3a.

[0025] (1-4. Casing) The casing 4 houses the motor 1, the impeller 2, and the circuit board 3. As shown in Figures 1 and 2, the casing 4 has a lower casing 41 and an upper casing .

[0026] The lower casing 41 is disposed axially below the impeller 2. The lower casing 41 has an intake port 41a penetrating the center in the axial direction. In a plan view from axially below, the intake port 41a exposes a part of the motor 1 and the impeller 2 to the outside. In detail, the lower casing 41 is a cylindrical shape with a rectangular outer shape in which four corners are combined with the outer periphery of a cylindrical part extending in the axial direction. The intake port 41a is circular. However, the lower casing 41 may have other shapes such as a cylindrical shape. The shape of the intake port 41a may also be other than circular. By providing the lower casing 41, it is possible to suppress the generation of turbulence around the lower shroud 23, and the blower device 100 can efficiently blow out air in the centrifugal direction.

[0027] The upper casing 42 is disposed axially above the impeller 2. The upper casing 42 is rectangular in plan view from the axial direction, and is approximately the same size as the lower casing 41. In plan view from the axial direction, the four corners of the lower casing 41 overlap with the four corners of the upper casing 42. In this embodiment, the lower casing 41 and the upper casing 42 are fixed by screws disposed at the four corners. An upper casing hole 42a penetrating in the axial direction is provided in the center of the upper casing 42. The axial upper part of the bearing holder 14 is inserted into the upper casing hole 42a. The bearing holder 14 is fixed to the upper casing 42.

[0028] In the blower device 100, air is sucked in through the intake port 41a of the lower casing 41 by the rotation of the impeller 2. The air sucked in through the intake port 41a swirls in the circumferential direction inside the casing 4 by the rotation of the impeller 2, and is then discharged through the exhaust port 4a provided between the lower casing 41 and the upper casing 42 in the axial direction. The lower shroud 23 and the upper shroud 24 improve the blowing efficiency of the blower device 100 by efficiently guiding the air sucked into the casing 4 from the intake port 41a to the exhaust port 4a. In this embodiment, the exhaust port 4a is provided over the entire circumferential area of ​​the casing 4. However, the exhaust port 4a may be provided only in a part of the circumferential area of ​​the casing 4. In this embodiment, the quality stability of the motor 1 can be improved, and therefore the quality stability of the blower device 100 can be improved.

[0029] <2. Stator> (2-1. Overview of the stator) FIG. 3 is a plan view of the stator 11 according to the embodiment of the present invention. FIG. 3 is a plan view of the stator 11 as viewed from above in the axial direction. In FIG. 3, the conductor 1131 constituting the coil 113 is omitted. The conductor 1131 is shown in FIG. 5 or FIG. 7 described later. FIG. 4 is an exploded perspective view of the stator 11 shown in FIG. 3. In FIG. 4, the terminal pin 114 shown in FIG. 3 is omitted. The stator 11 is used in the motor 1. As shown in FIG. 2 to FIG. 4, the stator 11 has a stator core 111, an insulator 112, a coil 113, and a terminal pin 114.

[0030] The stator core 111 is a magnetic body. The stator core 111 is formed, for example, by laminating electromagnetic steel sheets. However, the stator core 111 may be formed, for example, by joining a plurality of core pieces. The stator core 111 has an annular core back 1111 and a plurality of teeth 1112. The annular core back 1111 surrounds a central axis C extending vertically. In other words, the core back 1111 is annular about the central axis C. The teeth 1112 extend radially outward from the core back 1111. The plurality of teeth 1112 are arranged at intervals in the circumferential direction. In particular, the plurality of teeth 1112 are arranged at equal intervals in the circumferential direction.

[0031] In this embodiment, the number of slots 1113 provided between adjacent teeth 1112 is five or more. Specifically, the number of slots 1113 is twelve. The number of slots 1113 may be less than five. As the number of teeth 1112 increases, the number of coils 113 also increases. In this embodiment, the conductive wires 1131 constituting each coil 113 can be wound around the teeth 1112 in a well-balanced manner.

[0032] The insulator 112 covers at least a portion of the stator core 111. The insulator 112 is an insulating material and is made of, for example, resin. In this embodiment, as shown in FIG. 4, the insulator 112 has an upper insulator 112U and a lower insulator 112L. The upper insulator 112U is disposed axially above the stator core 111. The lower insulator 112L is disposed axially below the stator core 111. The upper insulator 112U covers the stator core 111 from above. The lower insulator 112L covers the stator core 111 from below.

[0033] The coils 113 are formed by winding a conductor 1131 around the teeth 1112 with the insulators 112 interposed therebetween. The coils 113 are formed on each tooth 1112. The number of coils 113 is the same as the number of teeth 1112. In this embodiment, the number of teeth 1112 and coils 113 is 12. In this embodiment, the coils 113 include a U-phase coil, a V-phase coil, and a W-phase coil. That is, the motor 1 having the stator 11 is a three-phase motor.

[0034] The terminal pin 114 extends axially upward from the upper surface of the insulator 112. An end of the conductor 1131 is connected to the terminal pin 114. The end of the conductor 1131 is wound around the terminal pin 114, for example. The end of the conductor 1131 and the terminal pin 114 are electrically connected by, for example, solder. The terminal pin 114 is also electrically connected to the circuit board 3 by, for example, solder. The stator 11 has a plurality of terminal pins 114. In this embodiment, the number of terminal pins 114 is six. In detail, for each of the coils 113 of the U phase, V phase, and W phase, there is a terminal pin 114 around which the winding start end is wound and a terminal pin 114 around which the winding end end is wound. The coils 113 of each phase are electrically connected to the circuit board 3.

[0035] (2-2. Stator Details) As shown in FIG. 3, the insulator 112 has an annular portion 1121, a plurality of first protruding portions 1122, and a plurality of second protruding portions 1123.

[0036] The annular portion 1121 covers at least a portion of the core back 1111. The annular portion 1121 is centered on the central axis C. In detail, as shown in FIG. 4, the annular portion 1121 has an upper annular portion 1121U and a lower annular portion 1121L. The upper annular portion 1121U is provided on the upper insulator 112U. The lower annular portion 1121L is provided on the lower insulator 112L. The upper annular portion 1121U is disposed axially above the core back 1111. The lower annular portion 1121L is disposed axially below the core back 1111.

[0037] The multiple first protrusions 1122 cover at least a portion of each tooth 1112. The multiple first protrusions 1122 protrude radially outward from the annular portion 1121. The first protrusions 1122 protrude radially outward from the outer circumferential edge of the annular portion 1121. The first protrusions 1122 are provided for each tooth 1112. That is, the number of the first protrusions 1122 is the same as the number of the teeth 1112. In this embodiment, the number of the first protrusions 1122 is 12. The multiple first protrusions 1122 are arranged at equal intervals in the circumferential direction.

[0038] In detail, as shown in FIG. 4, the first protrusion 1122 has an upper first protrusion 1122U and a lower first protrusion 1122L. The upper first protrusion 1122U is provided on the upper insulator 112U. The upper first protrusion 1122U protrudes radially outward from the outer circumferential edge of the upper annular portion 1121U. The lower first protrusion 1122L is provided on the lower insulator 112L. The lower first protrusion 1122L protrudes radially outward from the outer circumferential edge of the lower annular portion 1121L. The upper first protrusion 1122U is disposed axially upward on the tooth 1112. The lower first protrusion 1122L is disposed axially downward on the tooth 1112.

[0039] The second protrusions 1123 are provided between the first protrusions 1122 adjacent to each other in the circumferential direction. That is, the number of the second protrusions 1123 is the same as the number of the first protrusions 1122. In this embodiment, the number of the second protrusions 1123 is 12. The second protrusions 1123 protrude radially outward from the annular portion 1121 to a smaller extent than the first protrusions 1122. The second protrusions 1123 protrude radially outward from the outer circumferential edge of the annular portion 1121. The radially outward protrusion lengths of the second protrusions 1123 are the same. In a plan view from above in the axial direction, the radially outward end faces of the second protrusions 1123 have the same shape.

[0040] In detail, as shown in Fig. 4, the second protrusion 1123 has an upper second protrusion 1123U and a lower second protrusion 1123L. The upper second protrusion 1123U is provided on the upper insulator 112U. The upper second protrusion 1123U protrudes radially outward from the outer circumferential edge of the upper annular portion 1121U. The lower second protrusion 1123L is provided on the lower insulator 112L. The lower second protrusion 1123L protrudes radially outward from the outer circumferential edge of the lower annular portion 1121L.

[0041] In the stator 11, the terminal pins 114 are provided on some of the second protrusions 1123. In other words, the second protrusions 1123 are present even in positions where the terminal pins 114 are not provided. In this embodiment, the terminal pins 114 are provided on every other second protrusion 1123 arranged in the circumferential direction. That is, the terminal pins 114 are provided on half of the second protrusions 1123. This arrangement of the terminal pins 114 is an example. For example, the arrangement of the terminal pins 114 may be changed depending on the number of the terminal pins 114. Also, for example, the arrangement of the terminal pins 114 may be changed depending on the number of the teeth 1112.

[0042] According to this embodiment, the second protrusions 1123 are provided between the first protrusions 1122 adjacent to each other in the circumferential direction, regardless of whether the terminal pins 114 are provided at the positions or not. This makes it possible to prevent the coils 113 formed on the first protrusions 1122 from having a difference in shape between the left and right in the circumferential direction. That is, in each coil 113, it is possible to prevent the winding of the conductor 1131 wound around the teeth 1112 via the first protrusions 1122 from becoming unbalanced between the left and right in the circumferential direction. As a result, it is possible to prevent the variation in characteristics between the coils 113, and to improve the quality stability of the stator 11.

[0043] FIG. 5 is a schematic diagram showing an enlarged portion of the stator 11 according to the embodiment of the present invention. FIG. 5 is a plan view of the stator 11 viewed from above in the axial direction. FIG. 5 shows a virtual line 200 connecting the radially outer vertices P of two adjacent second protrusions 1123 via the first protrusions 1122. The vertices P are the points of the second protrusions 1123 that protrude most radially outward from the annular portion 1121 in a plan view from the axial direction. At least a part of the radially inner end of the coil 113 is disposed radially inward from the virtual line 200 in a plan view from the axial direction. In this embodiment, all of the radially inner ends of the coil 113 are disposed radially inward from the virtual line 200 in a plan view from the axial direction.

[0044] According to this embodiment, it is possible to prevent the radial length of the coil 113 from becoming shorter, despite the provision of the second protruding portion 1123. That is, according to this embodiment, it is possible to prevent the performance of the stator 11 from deteriorating due to a decrease in the number of turns of the coil 113, despite the provision of the second protruding portion 1123.

[0045] FIG. 6 is an enlarged perspective view of the second protruding portion 1123 and its periphery. As shown in FIG. 5 and FIG. 6, a recess 1124 recessed radially inward from the imaginary line 200 is provided between the first protruding portion 1122 and the second protruding portion 1123 in the circumferential direction. In other words, two recesses 1124 are present radially inward from the imaginary line 200 connecting the two vertices P. The two recesses 1124 have the same shape in a plan view from the axial direction. At least a part of the radial inner end of the coil 113 is accommodated inside the recess 1124. In this embodiment, the radial inner end of the coil 113 is accommodated inside the recess 1124 on the left and right sides in the circumferential direction. In detail, the recess 1124 has a curved surface 1124a that is convex radially inward.

[0046] According to this embodiment, recesses 1124 are provided between the second protruding portion 1123 and the first protruding portion 1122 on both sides in the circumferential direction of the first protruding portion 1122. Therefore, even though the second protruding portion 1123 is provided, it is possible to prevent the radial range in which the conductive wire 1131 can be wound on the first protruding portion 1122 from becoming narrow. In addition, since the recesses 1124 are curved, the conductive wire 1131 can be wound around the first protruding portion 1122 without being damaged.

[0047] In this embodiment, at least one annular conductor 1131 of the coil 113 is in circumferential contact with the second protruding portion 1123 on the radially inner side. The coil 113 is configured by winding the conductor 1131 multiple times around the teeth 1112 via the insulator 112. For this reason, the coil 113 is configured by multiple annular conductors 1131. In the example shown in FIG. 5, multiple annular conductors 1131 are in circumferential contact with the second protruding portion 1123 on the radially inner side of the coil 113. It is preferable that the multiple annular conductors 1131 are in circumferential contact with the second protruding portion 1123 on the left and right sides in the circumferential direction. According to this embodiment, the annular conductor 1131 constituting the coil 113 can be held down by the second protruding portion 1123, and winding irregularities of the conductor 1131 can be suppressed.

[0048] 6, the second protrusion 1123 has a curved outer surface 1123a that is convex outward in the radial direction. The point of the curved outer surface 1123a that is the furthest outward in the radial direction from the central axis C constitutes the above-mentioned apex P. In this embodiment, the curved outer surface 1123a is arc-shaped. According to this embodiment, it is possible to prevent localized force from being applied to the conductor that contacts the radial outer surface of the second protrusion 1123.

[0049] Fig. 7 is a schematic diagram showing an enlarged portion of the stator 11 according to the embodiment of the present invention. Fig. 7 is a plan view of the stator 11 as viewed from below in the axial direction. As shown in Fig. 7, the stator 11 has a crossover wire 1131a which is a part of the conductor 1131 and is disposed between the coils 113. The crossover wire 1131a has a first crossover wire portion 1131aa which faces the curved outer surface 1123a in the radial direction. The first crossover wire portion 1131aa does not have to contact the curved outer surface 1123a, but it is preferable that it does.

[0050] In this embodiment, since the radial outer surface of the second protruding portion 1123 is the curved outer surface 1123a, it is possible to suppress application of localized force to the first connecting wire portion 1131aa even if the first connecting wire portion 1131aa comes into contact with the radial outer surface of the second protruding portion 1123. Furthermore, since the first connecting wire portion 1131aa is disposed on the radial outer surface of the second protruding portion 1123, it is possible to suppress irregular winding of the conductor wire 1131 wound around the first protruding portion 1122.

[0051] The crossover wire 1131a has a second crossover wire portion 1131ab that faces the lower surface of the lower annular portion 1121L in the axial direction. The second crossover wire portion 1131ab may or may not contact the lower surface of the lower annular portion 1121L. In this embodiment, the crossover wire 1131a is not disposed on the upper surface of the upper annular portion 1121U from which the terminal pin 114 protrudes. The terminal pin 114 is provided on the side on which the circuit board 3 is provided. In this configuration, the blower device 100 can be made thinner than in a configuration in which the terminal pin 114 is provided on the side opposite the circuit board 3.

[0052] 8 is an enlarged cross-sectional view of the terminal pin 114 and its surroundings. As shown in FIG. 4 and FIG. 8, some of the multiple upper second protrusions 1123U are provided with pin holes 1125 that penetrate in the axial direction and into which the terminal pin 114 is inserted. In this embodiment, six of the twelve upper second protrusions 1123U are provided with pin holes 1125. The pin holes 1125 are circular in plan view from the axial direction. However, the shape of the pin holes 1125 may be a shape other than circular.

[0053] A through hole penetrating in the axial direction may also be provided in the upper second protruding portion 1123U into which the terminal pin 114 is not inserted. However, it is preferable that a through hole penetrating in the axial direction is not provided in the upper second protruding portion 1123U into which the terminal pin 114 is not inserted. This makes it possible to quickly recognize the position where the terminal pin 114 is attached.

[0054] In addition, in this embodiment, the second protrusion 1123 on which the terminal pin 114 is provided is provided with a greater axial thickness than the second protrusion 1123 on which the terminal pin 114 is not provided. In detail, the upper second protrusion 1123U on which the pin hole 1125 for inserting the terminal pin 114 is provided is provided with a greater axial thickness than the upper second protrusion 1123U on which the pin hole 1125 is not provided. By increasing the axial thickness of the second protrusion 1123 on which the terminal pin 114 is provided, the terminal pin 114 can be fixed firmly. By decreasing the axial thickness of the second protrusion 1123 on which the terminal pin 114 is not provided, the amount of resin used in manufacturing the insulator 112 can be reduced. However, the axial thickness of the second protrusion 1123 on which the terminal pin 114 is not provided may be the same as the axial thickness of the second protrusion 1123 on which the terminal pin 114 is provided. Regardless of whether or not the terminal pin 114 is inserted, all of the second protrusions 1123 may have the same shape.

[0055] As shown in FIG. 4 and FIG. 8, some of the lower second protrusions 1123L are provided with axial recesses 1126 that overlap the pin holes 1125 in the axial direction and are recessed in the axial direction. The axial recesses 1126 are provided opposite the pin holes 1125. For this reason, in this embodiment, the axial recesses 1126 are provided in six of the twelve lower second protrusions 1123L. The axial recesses 1126 are circular in a plan view from the axial direction. However, the shape of the axial recesses 1126 may be a shape other than a circle. The terminal pins 114 inserted into the pin holes 1125 may or may not be inserted into the axial recesses 1126. However, it is preferable that the terminal pins 114 are inserted into the axial recesses 1126. This makes it possible to firmly hold the terminal pins 114 and to prevent the axial thickness of the stator 11 from becoming thicker than necessary.

[0056] In this embodiment, a recess recessed in the axial direction is also provided in the lower second protruding portion 1123L that overlaps in the axial direction with the upper second protruding portion 1123U that does not have the pin hole 1125. The recess does not have to be provided. Also, instead of the axial recess 1126, a through hole penetrating in the axial direction may be provided.

[0057] In this embodiment, the lower second protruding portion 1123L is provided with an axial recess 1126 instead of a through hole penetrating in the axial direction. This makes it possible to prevent the terminal pin 114 inserted into the pin hole 1125 from protruding from the lower surface of the lower insulator 112L. In other words, it is possible to prevent the terminal pin 114 from contacting the second jumper portion 1131ab arranged on the lower surface side of the insulator 112. Furthermore, according to this embodiment, even if shavings are generated when inserting the terminal pin 114 into the insulator 112, the shavings can be retained within the axial recess 1126.

[0058] <3. Notes> Various technical features disclosed in this specification may be modified in various ways without departing from the spirit of the technical creation. Furthermore, multiple embodiments and modifications shown in this specification may be combined to the extent possible. [Industrial Applicability]

[0059] The present invention can be widely used in stators for outer rotor type motors, and can be used, for example, in centrifugal fans provided for blowing air onto car seats. [Explanation of symbols]

[0060] 1. Motor 2. Impeller 11. Stator 12 Rotor 100... Blower 111···Stator core 112...Insulator 112L...Lower insulator 112U···Upper insulator 113... Coil 114···Terminal pin 121...Magnet 200...Virtual line 1111 Coreback 1112...Teeth 1113...Slot 1121... Annular part 1121L...Lower annular part 1121U···Upper annular section 1122...1st protrusion 1123...Second protrusion 1123a... Curved outer surface 1123L...Lower second protrusion 1123U... Upper second protrusion 1124...Recess 1125 Pin hole 1126 Axial recess 1131...conductor 1131a... Crossover 1131aa···First crossover section 1131ab...Second crossover section C...Central axis P vertex

Claims

1. A stator for use in a motor, a stator core having an annular core back surrounding a central axis extending vertically and a plurality of teeth extending radially outward from the core back; an insulator covering at least a portion of the stator core; a coil formed by winding a conductor around the tooth via the insulator; a terminal pin extending axially upward from an upper surface of the insulator and to which an end of the conductor is connected; having The insulator comprises: an annular portion covering at least a portion of the core back and centered on the central axis; a plurality of first protrusions covering at least a portion of each of the teeth and protruding radially outward from an outer circumferential edge of the annular portion; a plurality of second protruding portions provided between adjacent first protruding portions in the circumferential direction and protruding radially outward from an outer circumferential edge of the annular portion to a smaller extent than the first protruding portions; having At an outer circumferential edge of the annular portion, a root portion in a protruding direction of the first protruding portion and a root portion in a protruding direction of the second protruding portion are aligned in a circumferential direction, The terminal pin is provided on some of the second protrusions, At least a part of a radially inner end of the coil is disposed radially inward from a virtual line connecting radially outer vertices of two adjacent second protruding portions via the first protruding portion in a plan view from the axial direction, A recess is provided between each of the first protruding portions and the second protruding portions in the circumferential direction, the recess being recessed radially inward from the imaginary line, At least a portion of a radially inner end of the coil is accommodated inside the recess.

2. The stator according to claim 1 , wherein the second protrusion has a curved outer surface that is convex radially outward.

3. a jumper wire that is a part of the conductor and is arranged between the coils, The stator according to claim 2 , wherein the crossover wire has a first crossover wire portion that faces the curved outer surface in a radial direction.

4. The stator according to claim 1 , wherein the at least one annular conductor of the coil is in circumferential contact with the second protruding portion at a radially inner portion.

5. The insulator comprises: an upper insulator arranged axially above the stator core; a lower insulator arranged axially below the stator core; having The second protrusion is an upper second protrusion provided on the upper insulator; a lower second protrusion provided on the lower insulator; having Some of the upper second protruding portions are provided with pin holes that penetrate in the axial direction and into which the terminal pins are inserted, The stator according to claim 1 , wherein some of the lower second protrusions are provided with an axial recess that overlaps with the pin hole in the axial direction and is recessed axially downward.

6. The annular portion is an upper annular portion provided on the upper insulator; a lower annular portion provided in the lower insulator; having a jumper wire that is a part of the conductor and is arranged between the coils, The stator according to claim 5 , wherein the crossover wire has a second crossover wire portion that faces a lower surface of the lower annular portion in the axial direction.

7. The stator according to claim 1 , wherein the number of slots provided between adjacent teeth is five or more.

8. A stator according to any one of claims 1 to 7; a rotor having a magnet radially opposed to the stator; A motor having

9. A motor according to claim 8; an impeller that rotates together with the rotor; A blower device having the above structure.

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