JP2020022249A - Stator and brushless motor - Google Patents

Abstract

To properly route a crossover wire using no bus bar.SOLUTION: A stator 3 includes: first insulator components 11 having a first mounting unit 13 that extends radially outward from a first annular unit 12 and is mounted on every other 3n of 6n teeth units 3A; second insulator components 21 having a second mounting unit 23 that extends radially outward from an annular second annular unit 22 having an outer diameter smaller than an inner diameter of the first annular unit 12 and is mounted on remaining 3n teeth units 3A; core units 17, 27 that are fixed to the mounting units 13, 23 and function as teeth units 3A; coil units 15, 25 that are wound about each teeth unit 3A; and crossover wires 16, 26 connecting the coil units 15, 25 with a same phase. With the stator, the second circular annular unit 22 is combined so as to be positioned inside the first annular unit 12. The crossover wires 16, 26 are routed along a peripheral surface of the first circular annular unit 12 or an end face of the second circular annular unit 22.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a stator having a split core structure, and a brushless motor including the stator.

  Conventionally, an inner rotor type brushless motor in which a stator core has a divided structure is known. For example, Patent Literature 1 discloses a stator including a ring-shaped stator core in which divided cores are arranged in an annular shape, and a cylindrical housing that tightens the stator core from the outer periphery. The stator is provided with a ring-shaped bus bar unit, and the ends of the coils wound around the teeth are connected to the connection pieces of the bus bar unit by welding.

JP 2008-278704 A

  However, in the case of the configuration in which the coils of the same phase are connected to each other using the bus bar as in Patent Document 1 described above, the bus bar is an expensive component, and thus the cost of the stator and the motor is increased. In addition, since the bus bar is thicker than the winding, if a unit including the bus bar is arranged on the axial end face of the stator as in Patent Document 1, the axial dimension of the motor increases, and the motor becomes larger. There is also the problem of being connected.

  The stator and the brushless motor of the present invention have been devised in view of such a problem, and an object thereof is to appropriately route a crossover without using a bus bar. It is to be noted that the present invention is not limited to this object, and it is another advantage of the present invention that the present invention is not limited to the conventional technology, and is an operation effect derived from each configuration shown in the embodiments for carrying out the invention described later. is there.

  (1) In the stator disclosed herein, a winding is wound in a Y-connection system around 6n (where n is an integer of 2 or more) teeth portions arranged in a motor housing and arranged in a circumferential direction. A first annular portion having an annular shape, and 3n of the teeth extending radially outward from the first annular portion and alternately provided with the 3n teeth of the 6n teeth portions. An insulating first insulator part having a first mounting part mounted on the part, an annular second annular part having an outer diameter smaller than an inner diameter of the first annular part, and the second circle An insulating second insulator component extending radially outward from the ring portion and having a second attachment portion attached to the remaining 3n teeth portions of the 6n teeth portions, The tee fixed to each of the first mounting portion and the second mounting portion A core part functioning as a part, a coil part wound around the teeth part via the first mounting part or the second mounting part, and a coil part having the same phase among the 6n coil parts. A connecting line for connection. In the stator, the second annular portion is located radially inward of the first annular portion, and the first annular portion and the second annular portion are combined so as to overlap when viewed from the radial direction. The connecting wire is routed along a peripheral surface of the first annular portion or an axial end surface of the second annular portion.

(2) It is preferable that the first annular portion has a notch formed by radially notching a part of the axial end surface within a circumferential range where the first mounting portion exists.
(3) In this case, two notches are formed at intervals in the circumferential direction at positions where the crossover wires connecting the coil portions of the same phase that are not adjacent in the circumferential direction extend in the first annular portion. Preferably, the crossover is passed through one of the two notches and then through the other.

(4) Of the crossovers routed along the first annular portion, the crossovers connecting between the coil portions that are adjacent in the circumferential direction are formed on the inner peripheral surface side of the first annular portion. Preferably along.
(5) The second annular portion has a groove portion that guides the crossover routed along the second annular portion, and an eave portion that prevents the crossover line from rising along the groove portion. Is preferred.

(6) It is preferable that the first annular portion and the second annular portion are arranged on the bottom side of the bottomed cylindrical housing.
In addition, it is preferable that the first annular portion has an arch portion that is recessed so as to straddle the base end portion at a position overlapping the base end portion of the second mounting portion in the axial direction. Further, it is preferable that the second annular portion has a concave portion provided on the end surface in the axial direction to avoid the crossover located on the inner peripheral surface side of the first annular portion. Further, it is preferable that a step is formed at a base end of the second mounting portion to avoid the first annular portion.

  (7) A brushless motor disclosed herein includes the stator described in any one of (1) to (6) above, and a rotor disposed at the center of the stator.

  According to the disclosed stator and brushless motor, a crossover can be appropriately routed without using a bus bar, so that cost reduction and size reduction can be achieved.

1 is an exploded view illustrating a brushless motor according to an embodiment, in which a stator and a housing are shown in a cross-sectional view, and a rotor is shown in a side view. It is a perspective view of a stator concerning an embodiment. FIG. 3 is a front view of the stator of FIG. 2 as viewed from a wiring portion side along an axial direction. FIG. 3 is a perspective view of a first stator constituting the stator of FIG. 2. FIG. 5 is a front view of the first stator of FIG. 4. It is a perspective view of the 1st insulator component which the 1st stator of FIG. 4 has. FIG. 7 is a front view of the first insulator part of FIG. 6. FIG. 3 is a perspective view of a second stator constituting the stator of FIG. 2. FIG. 9 is a front view of the second stator of FIG. 8. FIG. 9 is a perspective view of a second insulator component included in the second stator of FIG. 8. It is a front view of the 2nd insulator part of FIG. FIG. 4 is a connection diagram of a first stator. It is a wiring diagram of a 2nd stator.

  With reference to the drawings, a stator and a brushless motor (hereinafter, also simply referred to as “motor”) as embodiments will be described. The embodiment described below is merely an example, and there is no intention to exclude various modifications and application of technology not explicitly described in the following embodiment. Each configuration of the present embodiment can be variously modified and implemented without departing from the spirit thereof. Further, they can be selected as needed, or can be appropriately combined.

[1. Constitution]
[1-1. overall structure]
FIG. 1 is an exploded view in the axial direction of a brushless motor 1 (hereinafter, referred to as “motor 1”) according to the present embodiment. The motor 1 is an inner rotor type brushless DC motor, and includes a cylindrical rotor 2 having a magnet 2 </ b> B, a stator 3 around which a winding 5 is wound, and a housing 6 forming an outer shell of the motor 1. In addition, the stator 3 shown in FIG. 1 is a cross-sectional view taken along line XX of FIG.

  As shown in FIG. 1, the rotor 2 has a rotor core 2A that rotates integrally with the shaft 4, and a plurality of magnets 2B fixed to the rotor core 2A. The shaft 4 is a rotating shaft that supports the rotor 2, and also functions as an output shaft that extracts the output (mechanical energy) of the motor 1 to the outside. The shaft 4 is provided with bearings 7A and 7B at two places with the rotor core 2A interposed therebetween. In the present embodiment, the bearing 7A is provided at one end (lower end) of the shaft 4, and the bearing 7B is provided at an intermediate portion of the shaft 4.

  The rotor core 2A is a laminated core in which a plurality of steel plates having the same shape are laminated, and functions as a path for the generated magnetic force. The rotor core 2A has a plurality of sector-shaped magnetic pole pieces formed radially from an annular portion to which the shaft 4 is fixed. Further, the space between the magnetic pole pieces adjacent in the circumferential direction of the rotor core 2A functions as an accommodating portion in which the magnet 2B is fitted and fixed. In the present embodiment, a rotor 2 having a 16-pole magnet 2B is exemplified.

  The housing 6 has a bottomed cylindrical shape (substantially cylindrical shape) with one end opened and houses the rotor 2 and the stator 3. The housing 6 has a substantially cylindrical side wall 6A and a circular bottom 6B, and an end bell (lid) (not shown) is attached to an upper end surface of the side wall 6A (upper opening of the housing 6). The bottom portion 6B has a bearing recess 6C that is recessed at the center of the bulging portion that is formed to protrude at the center. The housing 6 supports a part of the shaft 4 via a bearing 7A fitted into the bearing recess 6C. The end bell is provided with a through hole into which the bearing 7B is fitted. The end bell supports the other part of the shaft 4 via the bearing 7B.

  As shown in FIGS. 1 to 3, the stator 3 is a substantially cylindrical component having a space 3 </ b> B in which the rotor 2 is disposed at the center, and is disposed and fixed in the housing 6. The stator 3 is configured such that a winding 5 is wound in a Y-connection system around 6n (where n is an integer of 2 or more) teeth portions 3A arranged in a circumferential direction. In the present embodiment, a stator 3 (a so-called 18-groove stator) having 18 (that is, n = 3) teeth portions 3A is exemplified. In addition, in the stator 3 of FIG. 3, the numbers of No. 1 to No. 18 are indicated by circles on the 18 teeth portions 3A.

  Each tooth portion 3A is provided with coil portions 15 and 25 formed by winding the winding 5. That is, the stator 3 of the present embodiment is provided with 18 coil portions 15 and 25. The 18 coil portions 15 and 25 constitute one of the U-phase, V-phase and W-phase, and the coil portions 15 and 25 having the same phase are connected by crossover wires 16 and 26. At one end of the stator 3 in the axial direction, a wiring portion 3C on which the connecting wires 16 and 26 are provided is provided. In the stator 3 of the present embodiment, the routing portion 3C is disposed on the bottom 6B side of the housing 6.

  2 and 3, alphabets "U", "V", "W" given to each tooth portion 3A indicate a phase, an alphabet "S" indicates a winding start line of each phase, and an alphabet " E "indicates a winding end line of each phase. The horizontal bar (-) indicates that the winding direction of the winding 5 around the tooth portion 3A is counterclockwise as viewed from the radial outside, and the tooth portion 3A without the horizontal bar indicates the winding direction of the winding 5. Indicates that the turning direction is clockwise as viewed from the radial outside. Hereinafter, winding the winding 5 clockwise is referred to as “right winding”, and winding the winding 5 counterclockwise is referred to as “left winding”.

  The stator 3 is configured by combining a first stator 10 shown in FIGS. 4 and 5 and a second stator 20 shown in FIGS. 8 and 9. That is, the stator 3 of the present embodiment has a split core structure in which the core on the first stator 10 side and the core on the second stator 20 side are combined. The first stator 10 is provided with an odd-numbered teeth portion 3A of the stator 3 of FIG. 3, and the second stator 20 is provided with an even-numbered teeth portion 3A of the stator 3 of FIG.

  Further, both the first stator 10 and the second stator 20 include components having the same function. Hereinafter, the parts of the first stator 10 are denoted by reference numerals in the tenth generation, and the parts of the second stator 20 are denoted by reference numerals in the twentieth generation. In addition, the same first digit is used for the sign of the component having the same function. When the U-phase, V-phase, and W-phase coil portions 15, 25 and the crossovers 16, 26 are distinguished, u, v, w are appended to the end of the reference numerals.

[1-2. Main Configuration]
As shown in FIGS. 4 and 5, the first stator 10 includes an insulating first insulator component 11 and a first assembly component 14, a magnetic first core component 17, and the winding 5. A first coil portion 15 and a first crossover 16. The first insulator component 11 is mounted on the first core component 17 from one side in the axial direction, and the first assembly component 14 is mounted from the other side. Further, by winding the winding 5 from above, three three-phase first coil portions 15u, 15v, and 15w are provided. The first crossovers 16u, 16v, and 16w are the windings 5 that connect the three in-phase first coil portions 15u, 15v, and 15w, respectively. The teeth 3A of the first stator 10 shown in FIG. 5 are given the same numbers (odd numbers) as those in FIG.

  Similarly, as shown in FIG. 8 and FIG. 9, the second stator 20 includes an insulating second insulator component 21 and a second assembly component 24, a magnetic second core component 27, and a winding. 5 and a second crossover 26. The second insulator component 21 is mounted on the second core component 27 from one side in the axial direction, and the second assembly component 24 is mounted from the other side. Further, by winding the winding 5 from above, three three-phase second coil portions 25u, 25v, and 25w are provided. The second crossovers 26u, 26v, 26w are the windings 5 connected to the three second coils 25u, 25v, 25w of the same phase. The teeth 3A of the second stator 20 shown in FIG. 9 are also given the same numbers (even numbers) as in FIG.

  As shown in FIGS. 6 and 7, the first insulator component 11 includes an annular first annular portion 12 and nine first annular portions 12 radially extending radially outward from the first annular portion 12. And a mounting portion 13. The first annular portion 12 is formed larger in the axial direction than in the radial direction, and can be said to be cylindrical. The peripheral surface of the first annular portion 12 functions as a guide surface for guiding the first crossover 16. That is, the first annular portion 12 is one of the elements constituting the above-described routing portion 3C. In addition, a recess is partially formed on both axial end surfaces of the first annular portion 12. This dent will be described later.

  The first mounting part 13 is a part mounted on every other 3n (that is, nine) teeth parts 3A among the 6n (18 in this embodiment) teeth parts 3A. That is, the nine first mounting portions 13 are arranged at equal intervals in the circumferential direction. A second mounting portion 23 described below is located between the first mounting portions 13 adjacent in the circumferential direction. The first mounting portion 13 includes a wound portion 13a continuously formed radially outward from the outer peripheral surface of the first annular portion 12, and a peripheral wall portion 13b formed radially outside the wound portion 13a. And

  The wound portion 13a is a portion around which the winding 5 is wound, and has a U-shaped cross section along the axial direction and the circumferential direction (a shape including two opposing surfaces and a surface connecting one edge thereof at a right angle). ). As shown in FIG. 1, the flat portion extending in the circumferential direction and the radial direction at the axial end of the wound portion 13 a is the core-side end of the first annular portion 12 (the upper end in FIG. 1). And the axial position are the same. Further, the two flat portions facing each other in the circumferential direction in the wound portion 13a are located closer to the core (the lower left side in FIG. 6) than the first annular portion 12. As shown in FIGS. 6 and 7, the peripheral wall portion 13 b is formed so that both the axial dimension and the peripheral dimension are larger than the wound portion 13 a, and as shown in FIG. Together with the peripheral wall portion 23b of the portion 23, the outer peripheral portion of the stator 3 is configured.

  As shown in FIGS. 1, 4 and 5, the first core component 17 is fixed to the first mounting portion 13, and a portion protruding inward from the side of the peripheral wall portion 13b functions as the teeth portion 3A. Further, the first assembled parts 14 are formed in substantially the same shape as the first mounting part 13, and are provided in the same number (here, nine) as the first core parts 17. The first assembly part 14 is fixed to the first mounting part 13 and sandwiches the first core part 17 between the first mounting part 13 and the first mounting part 13. Since the winding 5 is wound around the teeth portion 3A from the radial outside via the first mounting portion 13 and the first assembly component 14, a winding machine other than the nozzle can be used. Also, since there is a space for one tooth portion 3A between the adjacent tooth portions 3A in the circumferential direction, the amount of winding 5 (winding) that can be wound around each tooth portion 3A is larger than that of a stator having no split core structure. (Number, length) increases, and the space factor of the winding 5 increases. The winding 5 of the present embodiment is wound until the circumferential length of the first coil portion 15 is substantially equal to the circumferential length of the peripheral wall portion 13b.

  Here, a method of winding the winding 5 of the first stator 10 will be described with reference to the connection diagram of FIG. The circled numbers and alphabets described in the first core component 17 in FIG. 12 correspond to those shown in the stator 3 in FIG. In FIG. 12, the first annular portion 12 is shown by a two-dot chain line and a dot pattern. The first stator 10 is provided with only the odd-numbered teeth portions 3A (first core components 17), and three U-phase, V-phase, and W-phase first coil portions 15u, 15v, and 15w are formed.

  The winding 5 forming the U-phase first coil portion 15u is first wound right around the No. 5 teeth portion 3A, then left wound around the No. 15 teeth portion 3A located substantially diagonally, and finally wound. Then, it is left-wound to the adjacent tooth part 3A of No. 13. The first crossover 16u connecting between the teeth 3A of No.5 and No.15 and the first crossover 16u connecting between the teeth 3A of No.15 and No.13 are on one side in the axial direction (FIG. 12). It is routed along the first annular portion 12 provided on the upper side (middle upper side).

  Similarly, the winding 5 forming the V-phase first coil portion 15v is first wound left-hand around the No. 1 tooth portion 3A, then left-hand wound around the adjacent No. 3 tooth portion 3A, and finally, It is wound clockwise around the tooth part 3A of No. 11 located substantially diagonally. The first crossover 16v connecting the teeth 3A of No.1 and No.3 and the first crossover 16v connecting the teeth 3A of No.3 and No.11 are also connected to the first annular portion 12. It is routed along.

  Similarly, the winding 5 forming the W-phase first coil portion 15w is firstly wound right around the No. 17 tooth portion 3A, and then left-wound around the No. 9 tooth portion 3A located substantially diagonally. Finally, it is wound leftward around the adjacent tooth part 3A of No. 7. The first connecting wire 16w connecting between the tooth portions 3A of No. 17 and No. 9 and the first connecting wire 16 w connecting between the tooth portions 3A of No. 9 and No. 7 are also connected to the first annular portion 12. It is routed along. The winding start wire of each phase is connected to a power supply (not shown), and the winding end wire of each phase is combined to form a first neutral point 18. The winding start and the winding end may be reversed. In that case, the winding start lines are joined together to form the first neutral point 18.

  As shown in FIG. 5, each of the three-phase first connecting wires 16u, 16v, and 16w includes a first connecting wire 16 that connects between the first coil portions 15 that are adjacent in the circumferential direction, and a first annular portion 12. And the first crossover 16 that makes a substantially half circle along the line. In the present embodiment, the former first crossover 16 is arranged along the inner peripheral surface side of the first annular portion 12, and the latter first crossover 16 is arranged along the outer peripheral surface side of the first annular portion 12. Will be searched. Thereby, the possibility of contact between the first crossovers 16 is reduced.

  As shown in FIGS. 4 to 7, the first annular portion 12 of the first insulator component 11 has a cutout portion 12 a for appropriately routing the first crossover 16 and two types of protrusions 12 b and 12 c. Is provided. The notch 12a is formed by radially notching a part of the axial end surface (the surface facing the bottom 6B side) of the first annular portion 12 within the circumferential range where the first mounting portion 13 exists. You. In other words, the center of the first annular portion 12 (see FIG. 7) and the inside of nine virtual fan-shaped regions formed by connecting both ends in the circumferential direction of the first mounting portion 13, A notch 12a is formed by cutting the end face in the radial direction. In FIG. 7, two fan-shaped regions are illustrated by two-dot chain lines. The end face where the notch 12a is provided is the end face of the first annular portion 12 opposite to the core side.

  Two notches 12a are formed in the first annular portion 12 at positions where the first crossover wires 16 connecting the first coil portions 15 of the same phase that are not adjacent in the circumferential direction extend at intervals in the circumferential direction. ing. Specifically, the tooth portions 3A of No. 5 and No. 15 (U phase), No. 3 and No. 11 (V phase), No. 17 and No. 9 (W phase) in FIG. The fan-shaped region includes two notches 12a. As a result, a portion between the two cutouts 12a remains as a protrusion protruding in the axial direction in each fan-shaped region including the teeth portion 3A. Hereinafter, this protrusion is referred to as “guide protrusion 12b”. The positions where the first crossovers 16 connecting the circumferentially adjacent first coil portions 15 are drawn out, that is, No. 13 (U phase), No. 1 (V phase), No. 7 (FIG. 5) in FIG. One notch 12a is provided in the fan-shaped region including the teeth portion 3A (W phase).

  Each of the first crossover wires 16 drawn from each of the first coil portions 15 is routed radially inward of the first annular portion 12 through the notch portion 12a. At the position where the two cutouts 12a are provided side by side, the first crossover 16 passed radially inward is passed through the other cutout 12a and drawn out radially outward. In other words, the first crossover 16 connecting the first coil portions 15 of the same phase that are not adjacent in the circumferential direction (for example, the first crossover 16u connecting the teeth 3A of No. 5 and No. 15) is the guide protrusion 12b. It is hooked and routed. Accordingly, the first crossover 16 is not obliquely pulled out of the first coil portion 15, and interference between the first crossover 16 and a second coil portion 25 described below is avoided.

  Further, between the teeth portions 3A on the outer peripheral surface of the first annular portion 12, a pressing projection portion 12c protruding radially outward is provided. The pressing protrusion 12c has a function of suppressing the axial displacement and lifting of the first crossover 16 routed along the outer peripheral surface of the first annular portion 12. In addition, in the first insulator part 11 of the present embodiment, in order to change the axial position (height) of the first crossover 16, two holding protrusions are provided between the teeth 3A of No.5 and No.7. 12c are arranged offset from each other in the axial direction. Further, between the other teeth portions 3A, one holding protrusion 12c is provided. Note that the number of the holding protrusions 12c is not limited to this.

  Further, the first insulator component 11 is provided with an arch portion 12d for avoiding interference with the second insulator component 21 when the first stator 10 and the second stator 20 are combined. As shown in FIGS. 4 and 6, the arch portion 12 d is a recess formed by cutting out a predetermined position on an end surface of the first annular portion 12 opposite to the end surface on which the cutout portion 12 a is formed. . This predetermined position is between the teeth portions 3A adjacent in the circumferential direction. That is, when the first stator 10 and the second stator 20 are combined with each other, the arch portion 12d straddles the base end at a position axially overlapping with a base end of the second mounting portion 23 described later. It is recessed.

  As shown in FIGS. 10 and 11, the second insulator component 21 includes an annular second annular portion 22 and nine second annular portions 22 radially extending radially outward from the second annular portion 22. And a mounting part 23. The second annular portion 22 is formed in a hollow disk shape having an outer diameter D2 (see FIG. 11) smaller than the inner diameter D1 (see FIG. 7) of the first annular portion 12. The inner diameter of the second annular portion 22 is larger than the outer diameter of the bearing 7 </ b> A and smaller than the outer diameter of the rotor 2. That is, at least a part of the second annular portion 22 overlaps the rotor 2 when viewed in the axial direction.

  One of the two end surfaces in the axial direction of the second annular portion 22 functions as a guide surface for guiding the second crossover 26. Hereinafter, this end surface is also referred to as a guide surface 22j. The second annular portion 22 is one of the components constituting the above-described routing portion 3C. In the present embodiment, the guide surface 22j faces the bottom 6B side of the housing 6. The guide surface 22j of the second annular portion 22 is provided with a dent, a hole, and the like, and these configurations will be described later.

  The second mounting part 23 is a part that is mounted on the remaining 3n (that is, nine) teeth parts 3A of the 6n (18 in this embodiment) teeth parts 3A. That is, the nine second mounting portions 23 of the second insulator component 21 are also arranged at equal intervals in the circumferential direction. The second mounting portion 23 includes a wound portion 23a formed continuously radially outward from the outer peripheral surface of the second annular portion 22, and a peripheral wall portion 23b formed radially outside the wound portion 23a. And

  The wound portion 23a is a portion around which the winding 5 is wound, and has a U-shaped cross section along the axial direction and the circumferential direction (a shape including two opposing surfaces and a surface connecting one edge thereof at a right angle). ). As shown in FIG. 1, the wound portion 23 a is located closer to the core (upper side in FIG. 1 and lower left side in FIG. 10) than the second annular portion 22 in the axial direction. As shown in FIGS. 10 and 11, the peripheral wall portion 23b is formed to have a larger axial dimension and a larger peripheral dimension than the wound portion 23a, and as shown in FIG. Of the stator 3 together with the peripheral wall portion 13b.

  As shown in FIGS. 1, 8, and 9, the second core component 27 is fixed to the second mounting portion 23, and a portion protruding inward from the side of the peripheral wall portion 23b functions as the teeth portion 3A. Further, the second assembly components 24 are formed in substantially the same shape as the second mounting portion 23, and are provided in the same number (here, nine) as the second core components 27. The second mounting component 24 is fixed to the second mounting portion 23 and sandwiches the second core component 27 between the second mounting component 23 and the second mounting portion 23. Like the first stator 10, the winding 5 is wound around the teeth portion 3A from the radial outside via the second mounting portion 23 and the second assembly component 24, so that the winding machine other than the nozzle is used. Can be used. Also, since there is a space for one tooth portion 3A between the adjacent tooth portions 3A in the circumferential direction, the amount of winding 5 (winding) that can be wound around each tooth portion 3A is larger than that of a stator having no split core structure. (Number, length) increases, and the space factor of the winding 5 increases. Also in the second stator 20, the winding 5 is wound until the circumferential length of the second coil portion 25 is substantially the same as the circumferential length of the peripheral wall portion 23b.

  Here, a method of winding the winding 5 of the second stator 20 will be described with reference to the connection diagram of FIG. The circled numbers and alphabets written in the second core component 27 in FIG. 13 correspond to those shown in the stator 3 in FIG. FIG. 13 shows the second annular portion 22 in a two-dot chain line and a dot pattern. The second stator 20 is provided with only the even-numbered teeth portion 3A (second core component 27), and three U-phase, V-phase, and W-phase second coil portions 25u, 25v, and 25w are formed.

  The winding 5 forming the U-phase second coil portion 25u is firstly left-wound around the No. 4 tooth portion 3A, then left-wound around the adjacent No. 6 tooth portion 3A, and finally substantially diagonally. Is wound right around No. 14 teeth section 3A. The second connecting wire 26u connecting between the tooth portions 3A of No. 4 and No. 6 and the second connecting wire 26u connecting between the tooth portions 3A of No. 6 and No. 14 are one side in the axial direction (FIG. 13). It is routed along the second annular portion 22 provided on the upper side (middle upper side).

  Similarly, the winding 5 forming the V-phase second coil portion 25v is first wound right-hand around the No. 2 tooth portion 3A, and then left-hand wound around the No. 10 tooth portion 3A located substantially diagonally. Finally, it is left-wound to the adjacent No. 12 tooth part 3A. The second connecting wire 26v connecting between the tooth portions 3A of No. 2 and No. 10 and the second connecting wire 26v connecting between the tooth portions 3A of No. 10 and No. 12 are also connected to the second annular portion 22. It is routed along.

  Similarly, the winding 5 forming the W-phase second coil portion 25w is firstly left-wound around the No. 18 tooth portion 3A, then left-wound around the adjacent No. 16 tooth portion 3A, and finally, It is wound clockwise around the tooth portion 3A of No. 8 located substantially diagonally. The second connecting wire 26w connecting between the tooth portions 3A of No. 18 and No. 16 and the second connecting wire 26w connecting between the tooth portions 3A of No. 16 and No. 8 are also connected to the second annular portion 22. It is routed along. The winding start wire of each phase is connected to a power supply (not shown), and the winding end wire of each phase is combined to form a second neutral point 28. The winding start and the winding end may be reversed. In that case, the winding start lines are joined together to form the second neutral point 28.

  As shown in FIGS. 8 to 11, the second annular part 22 of the second insulator component 21 is provided with a groove 22 e and an eave 22 f for appropriately routing the second crossover 26. The groove 22 e is a recess (groove) formed in the guide surface 22 j of the second annular portion 22, and has a function of guiding the second crossover 26 routed along the second annular portion 22. A plurality of grooves 22e are provided, and the depth of each groove 22e is the same, but the shape is not the same.

  On the other hand, the eave portion 22f has a function of preventing the second crossover 26 that is routed along the groove portion 22e from rising. The eaves 22f project from a corner of a wall forming the groove 22e in a direction orthogonal to the axial direction at a position overlapping with the through hole 22h indicated by a dot pattern in FIG. 11 when viewed in the axial direction. It is. The corner where the eaves 22f are provided is a position at which the direction in which the second crossover line 26 is routed along the groove 22e changes. The through-hole 22h is provided for forming the eaves 22f when the second insulator component 21 is molded with resin.

  As shown in FIGS. 10 and 11, the second insulator component 21 has a first stator 10 and a second stator 20 for preventing interference with the first crossover 16 when the first stator 10 and the second stator 20 are combined. A recess 22g and a step 23c for avoiding interference with the first insulator component 11 are provided. The recess 22g is a recess formed at a predetermined position on the outer peripheral end of the guide surface 22j of the second annular portion 22. The predetermined position is, as shown in FIG. 3, a position where the first crossover 16 exists on the inner peripheral surface side of the first annular portion 12 when the first stator 10 and the second stator 20 are combined. It is. In other words, the concave portion 22g is formed so as to avoid the first crossover wire 16 located on the inner peripheral surface side of the first annular portion 12 when the first stator 10 and the second stator 20 are combined. Is done. The step 23 c is located at the base end of the second mounting portion 23 and is formed one step lower than the guide surface 22 j of the second annular portion 22. The step 23c overlaps the arch 12d in the axial direction.

  As shown in FIGS. 1 to 3, in the stator 3, the second annular portion 22 is located radially inside the first annular portion 12, and the first annular portion 12 and the second circular portion are viewed from the radial direction. The first stator 10 and the second stator 20 are combined so that the ring portions 22 overlap. Then, the first neutral point 18 and the second neutral point 28 are combined to complete the parallel Y-connection type stator 3. The stator 3 has the first annular portion 12 and the second annular portion 22 arranged and fixed on the bottom 6B side in the housing 6.

  In addition, the above-mentioned “the first annular portion 12 and the second annular portion 22 overlap” refers to the axial direction of the two annular portions 12, 22 when viewed from the radial direction, as shown in FIG. The positions are substantially the same, and it means that at least a part of both overlaps. That is, both the first annular portion 12 and the second annular portion 22 are located on the same axial side with respect to the core components 17 and 27. For example, the second stator 20 shown in FIG. 8 is inserted from the lower left direction to the upper left direction with respect to the first stator 10 shown in FIG. If the two are positioned so that they overlap when viewed from the radial direction, the stator 3 shown in FIG. 2 is obtained. Note that, naturally, the teeth portions 3A of the first stator 10 and the teeth portions 3A of the second stator 20 are combined so as to be alternately arranged in the circumferential direction.

[2. effect]
(1) In the above-described stator 3, the first crossover 16 is routed along the peripheral surface of the first annular portion 12, and the second crossover 26 extends along the guide surface 22 j of the second annular portion 22. They are routed, and the routing methods of the crossovers 16 and 26 are different from each other. As a result, when the first stator 10 and the second stator 20 are combined, the crossover wires 16 and 26 do not interfere with each other, so that the crossover wires 16 and 26 can be appropriately arranged without using a conventionally used bus bar. Can search. For this reason, cost reduction and size reduction can be achieved as compared with the case where a bus bar is used.

  In the stator 3 described above, two annular portions 12 and 22 that do not interfere with each other are provided radially inside the teeth portion 3 </ b> A, and the connecting wires 16 and 26 are routed along the annular portions 12 and 22. Therefore, the space efficiency of the motor 1 can be improved while preventing the crossovers 16 and 26 from interfering with each other. Thereby, it is possible to reduce the size of the motor 1. Further, since the connecting wires 16 and 26 are arranged radially inside the stator 3, the winding 5 can be wound around the teeth portion 3A from the radial outside. Thereby, a winding machine other than a nozzle can be used, and versatility can be improved. Further, the space factor of the windings 5 can be increased by using the stator 3 having the split core structure.

  (2) In the stator 3 described above, the notch portion 12 a is provided in the fan-shaped region of the first annular portion 12. For this reason, the first crossover 16 is drawn out from the first coil portion 15, passes through the notch 12 a, passes through the first annular portion 12 in the radial direction, and is then routed. As a result, since the first crossover 16 can be routed along the peripheral surface of the first annular portion 12 without sagging, the crossovers 16, 26 when the first stator 10 and the second stator 20 are combined. Interference between them can be avoided.

  (3) Further, in the above-described first insulator component 11, the notch portion 12a is provided at the position where the first connecting wire 16 connecting the first coil portions 15 of the same phase that are not adjacent in the circumferential direction extends in the first annular portion 12. One is provided. For this reason, the first crossover 16 connecting the first coil portions 15 that are not adjacent in the circumferential direction is passed through the two notches 12a. In other words, the first crossover 16 is hooked on the guide protrusion 12b existing between the two notches 12a. For this reason, the first crossover 16 is not pulled out obliquely from the first coil section 15, and interference between the first crossover 16 and the second coil section 25 can be avoided. In the embodiment described above, since the lifting of the first crossover 16 can be prevented by the pressing protrusion 12c provided on the first insulator component 11, the first crossover 16 can be more appropriately routed.

  (4) In the above-described stator 3, one of the first crossover wires 16 that connects between the first coil portions 15 that are adjacent in the circumferential direction is located on the inner circumferential surface side of the first annular portion 12 (the inner circumferential surface). Routed along the surface). Since the length of the first crossover wire 16 connecting the adjacent first coil portions 15 is short, even if the first crossover wire 16 is routed on the inner peripheral surface side of the first annular portion 12, the first crossover line 16 may be along the first annular portion 12. it can. On the other hand, since the length of the first connecting wire 16 connecting the first coil portions 15 that are not adjacent in the circumferential direction is long, the first connecting wire 16 is routed along the outer circumferential surface of the first annular portion 12 to thereby provide the first connecting wire. Interference between the lines 16 can be further avoided.

  (5) In the above-described stator 3, since the groove portion 22 e and the eave portion 22 f are provided in the second annular portion 22, it is possible to appropriately route the second crossover 26 along the second annular portion 22. The interference between the crossovers 16 and 26 can be reliably prevented.

  (6) In the above-described stator 3, the two annular portions 12, 22 are arranged and fixed on the bottom 6B side in the housing 6. Although a sensor or the like is provided on the end bell side of the housing 6, the space is small, but there is a space on the bottom 6B side of the housing 6 (around the bearing recess 6C). By arranging the crossovers 16, 26 in the space on the bottom 6B side (consolidating the crossovers 16, 26 on the bottom 6B side), the dead space can be effectively utilized. As a result, space efficiency is increased, and the motor 1 can be downsized.

  In the above-described embodiment, since the concave portion 22g is provided in the second annular portion 22, interference between the first crossover 16 and the second annular portion 22 can also be avoided. Further, since the first annular portion 12 is provided with the arch portion 12d and the base end portion of the second mounting portion 23 is provided with the step 23c, the first stator 10 and the second stator 20 are combined. Sometimes, interference between the first insulator component 11 and the second insulator component 21 can also be avoided.

[3. Others]
Each configuration of the stator 3 and the motor 1 described above is an example, and is not limited to the above. For example, the shape and arrangement of the notch 12a and the protrusions 12b and 12c of the first annular portion 12 may be different from those described above, or any of them may be omitted. For example, the notch 12a may be omitted and the first crossover 16 may be passed radially inward from the end face side of the first annular portion 12, or may not be passed radially inward. Further, instead of providing the guide protrusion 12b between the two notches 12a, the guide protrusion 12b may be provided so as to protrude from the end face. Alternatively, instead of these elements 12a to 12c, for example, the first crossover 16 may be routed by cutting a groove on the outer peripheral surface of the first annular portion 12. Note that the arch portion 12d can also be omitted.

  Further, the shapes and arrangements of the grooves 22e and the eaves 22f of the second annular portion 22 may be different from those described above or may be omitted. For example, the depth of the groove 22e may be changed according to the type of the second crossover 26. Further, the position of the concave portion 22g may be changed according to the method of arranging the first crossover 16, or the concave portion 22g may be omitted. The shapes of the mounting portions 13 and 23 and the shapes of the assembled components 14 and 24 may be set according to the shapes of the core components 17 and 27. Further, the step 23c at the base end of the second mounting portion 23 may be omitted.

  In the above-described embodiment, the motor 1 (16 poles and 18 grooves motor) having the magnet 2B having 16 poles and the stator 3 having 18 grooves has been illustrated. However, the number of poles of the magnet 2B and the number of grooves of the stator 3 (the number of the teeth portions 3A) Is not limited to this. It is sufficient that the number of teeth portions 3A is at least 6n (where n is an integer of 2 or more). For example, the above-described configuration is also applied to a stator of a 14-pole 12-groove motor or a stator of a 10-pole 12-groove motor. It is possible. Further, in the above-described embodiment, the parallel Y-connection type stator 3 is illustrated, but a series Y-connection may be used.

  Further, the stator 3 may be arranged in the housing 6 with the annular portions 12 and 22 facing the end bell side of the housing 6. The shape of the housing 6 and the configuration of the rotor 2 described above are merely examples, and are not limited to those described above.

1 motor (brushless motor)
2 Rotor 3 Stator 3A Teeth 4 Shaft 5 Winding 6 Housing 6B Bottom 10 First Stator 11 First Insulator Component 12 First Annular Part 12a Notch 13 First Mounting Part 15, 15u, 15v, 15w First Coil Part (Coil part)
16, 16u, 16v, 16w First crossover (crossover)
17 First core parts (core parts)
Reference Signs List 20 second stator 21 second insulator component 22 second annular portion 22e groove portion 22f eave portion 23 second mounting portion 25, 25u, 25v, 25w second coil portion (coil portion)
26, 26u, 26v, 26w Second crossover (crossover)
27 Second core parts (core parts)
D1 Outer diameter D2 Inner diameter

Claims (7)

A stator in which windings are wound in a Y-connection system around 6n (where n is an integer of 2 or more) teeth portions arranged in a motor housing and arranged in a circumferential direction,
An annular first annular portion, and a third annular portion radially extending outward from the first annular portion and attached to every other 3n teeth portions of the 6n teeth portions. An insulating first insulator component having one mounting portion,
An annular second annular portion having an outer diameter smaller than the inner diameter of the first annular portion, and a radially outer portion of the 6n teeth portions extending radially outward from the second annular portion; An insulating second insulator component having a second mounting portion mounted on the remaining 3n teeth portions;
A core component fixed to each of the first mounting portion and the second mounting portion and functioning as the teeth portion,
A coil portion wound via the first mounting portion or the second mounting portion for each of the teeth portions,
And a crossover connecting the in-phase coil portions of the 6n coil portions,
In the stator, the second annular portion is located radially inward of the first annular portion, and the first annular portion and the second annular portion are combined so as to overlap when viewed from the radial direction. Yes,
The stator according to claim 1, wherein the crossover is routed along a peripheral surface of the first annular portion or an axial end surface of the second annular portion. The first annular portion has a notch formed by radially notching a part of the axial end face within a circumferential range where the first mounting portion is present, wherein the notch is formed. Item 2. The stator according to Item 1. In the first annular portion, at the position where the crossover line connecting the coil portions of the same phase that are not adjacent in the circumferential direction extends, two notch portions are formed at intervals in the circumferential direction,
3. The stator according to claim 2, wherein the connecting wire is passed through one of the two notches and then through the other. Of the crossovers routed along the first annular portion, the crossovers connecting between the coil portions that are adjacent in the circumferential direction may be along the inner peripheral surface side of the first annular portion. The stator according to any one of claims 1 to 3, characterized in that: The second annular portion has a groove portion that guides the crossover routed along the second annular portion, and an eave portion that prevents the crossover line from rising along the groove portion. The stator according to any one of claims 1 to 4, wherein The stator according to any one of claims 1 to 5, wherein the first annular portion and the second annular portion are arranged on a bottom side of the bottomed cylindrical housing. . A stator according to any one of claims 1 to 6,
A rotor arranged at the center of the stator,
A brushless motor, comprising:

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