JP2024081941A - motor - Google Patents

Abstract

To provide a motor which can ensure a distance between two busbars adjacent to each other in the circumferential direction, while suppressing an increase in size.SOLUTION: A motor includes: a stator having a plurality of coils; a plurality of busbars; and a holder which holds the plurality of busbars. The holder is provided with protrusions extending in the axial direction. In the circumferential direction, ends of the busbars engage with the protrusions.SELECTED DRAWING: Figure 8

Description

The present invention relates to a motor.

Conventionally, a molded terminal block having a lead frame that connects the motor windings and external lead wires is known (see, for example, Patent Document 1).

The lead frame is a so-called bus bar, made of a conductive material and formed to extend in the circumferential direction. The molded terminal block also includes an insulating holder that holds the lead frame.

Furthermore, in a motor having multiple bus bars, when two adjacent bus bars are arranged in the circumferential direction, a necessary gap is required between the two bus bars in the circumferential direction to insulate the two bus bars from each other.

In conventional motors, circular holes are provided at the circumferential ends of the busbar, and the holder has pins that are inserted into the holes, and the busbar is held in the holder by inserting the pins into the holes.

JP 2003-103558 A

However, there is room for improvement in the above-mentioned motor in terms of ensuring the distance between two adjacent bus bars in the circumferential direction while preventing the motor from becoming too large.

In view of the above problems, the present invention aims to provide a motor that can ensure a sufficient distance between two adjacent bus bars in the circumferential direction while preventing the motor from becoming too large.

In order to solve the above problems and achieve the object, the motor according to the present invention comprises a stator having multiple coils, multiple bus bars, and a holder that holds the multiple bus bars, the holder being provided with a protrusion that extends in the axial direction, and the ends of the bus bars and the protrusion engage in the circumferential direction.

According to one aspect, the motor of the present invention can ensure the distance between two adjacent bus bars in the circumferential direction while preventing the motor from becoming too large.

FIG. 1 is a perspective view of a motor according to a first embodiment. FIG. 2 is a plan view of the motor shown in FIG. FIG. 3 is a perspective view of a stator included in the motor shown in FIG. FIG. 4 is a perspective view showing a bus bar provided in the motor shown in FIG. FIG. 5 is a perspective view showing a holder included in the motor shown in FIG. FIG. 6 is a perspective view showing a stator, a second bus bar, and a second holder of the motor shown in FIG. FIG. 7 is a perspective view showing a portion of the second holder and a portion of the second bus bar. 8 is a perspective view showing a protrusion and an engagement portion provided on the motor shown in FIG. 1. FIG. FIG. 9 is a perspective view of a motor according to the second embodiment. FIG. 10 is a perspective view showing a bus bar included in the motor shown in FIG. FIG. 11 is a plan view of the motor shown in FIG. 12 is a perspective view showing a holder included in the motor shown in FIG. 9. FIG. 13 is a perspective view showing a stator, a second bus bar, and a second holder of the motor shown in FIG. 9. FIG.

The motor according to the embodiment will be described in detail below with reference to the drawings. Note that the dimensional relationships and ratios of each element in the drawings may differ from the reality. The dimensional relationships and ratios of each element may differ between the drawings.

[First embodiment]
FIG. 1 is a perspective view of a motor 1 according to a first embodiment. FIG. 2 is a plan view of the motor 1 shown in FIG. 1. FIG. 3 is a perspective view of a stator 4 included in the motor 1 shown in FIG. 1. FIG. 4 is a perspective view of a bus bar 5 included in the motor 1 shown in FIG. 1. FIG. 5 is a perspective view of a holder 6 included in the motor 1 shown in FIG. 1. FIG. 6 is a perspective view of a stator 4, a second bus bar 52, and a second holder 62 included in the motor 1 shown in FIG. 1. FIG. 7 is a perspective view of a part of the second holder 62 and a part of the second bus bar 52. FIG. 8 is a perspective view of a protrusion 62d and an engagement portion 522c included in the motor 1 shown in FIG. 1. In the stator 4 shown in FIG. 3, for convenience of explanation, a part of the core 40 is omitted, some of the teeth 41 are omitted, some of the insulators 42 are omitted, and some of the coils 43 are omitted. For ease of explanation, the shaft 2 and the rotor 3 are omitted in Fig. 6 and Fig. 7. For ease of explanation, the first holder 61 and the first bus bar 51 are omitted in Fig. 6 and Fig. 7. For ease of explanation, the first bus bar 51 is omitted in Fig. 8, and the first holder 61 is shown by a virtual line.

In the description of the motor 1 according to the first embodiment, in order to make it easier to understand the directions, the direction in which the shaft 2 described later extends is called the axial direction A, the direction in which the rotor 3 described later rotates is called the circumferential direction C, and the direction that is included in a plane perpendicular to the axial direction A, passes through the axis 2o of the shaft 2, and is perpendicular to the circumferential direction C is called the radial direction R.

The motor 1 shown in FIG. 1 according to the first embodiment is an inner rotor type in which, when viewed from the axial direction A, the stator 4 is located outside the rotor 3 in the radial direction R, and the shaft 2 is located inside the rotor 3 in the radial direction R, with the rotor 3 as the reference.

The motor 1 according to the first embodiment is, for example, an electric motor that converts electrical energy from a power source into a driving force that rotates the shaft 2 in the circumferential direction C. The motor 1 is housed, for example, in a frame (not shown).

The motor 1 includes, for example, a shaft 2, a rotor 3, a stator 4, a bus bar 5, a holder 6, terminals 7, and a cover (not shown). The shaft 2 is a so-called rotating shaft, and is formed, for example, from a metal member in a substantially cylindrical shape extending along the axial direction A. The shaft 2 has an axis 2o (see FIG. 2), and is provided so as to be rotatable about the axis 2o. The shaft 2 transmits power to the outside by rotating in the circumferential direction C.

The rotor 3 is rotatable about the axis 2o of the shaft 2. In the motor 1 according to this embodiment, the shaft 2 and the rotor 3 are formed as a single unit.

As shown in FIG. 2, the rotor 3 is disposed inside the stator 4 (on the shaft 2 side) in the radial direction R. In other words, the motor 1 is an inner rotor type brushless motor in which the rotor 3 is located inside the stator 4 in the radial direction R.

The rotor 3 has a yoke 31 and multiple magnets 32. The yoke 31 is made of a magnetic material such as iron.

The magnets 32 are, for example, permanent magnets. The multiple magnets 32 are, for example, arranged at equal intervals along the circumferential direction C. The rotor 3 according to this embodiment has, for example, 14 magnets 32.

The stator 4 is a part that generates a force for rotating the rotor 3 in the circumferential direction C. As shown in FIG. 3, the stator 4 includes, for example, one core 40, multiple teeth 41, multiple insulators 42, and multiple coils 43.

The core 40 is formed by stacking plate-shaped magnetic bodies (metallic members) such as silicon steel plates, electromagnetic steel plates, soft magnetic steel plates, etc., in the axial direction A, and has magnetic properties. When viewed from the axial direction A, the core 40 is formed in an annular shape.

Each of the teeth 41 is formed to protrude from the inner peripheral surface of the core 40 toward the rotor 3 in the radial direction R. The stator 4 according to this embodiment has, for example, 18 teeth 41.

The insulators 42 are formed, for example, from an insulating resin and are attached to the surfaces of the teeth 41 to ensure insulation between the teeth 41 and the coils 43. The stator 4 according to this embodiment includes, for example, 18 insulators 42.

The coil 43 is formed, for example, by winding a wire around the teeth 41 via an insulator 42. The wire has a conductive core (not shown) and an insulating coating (not shown) that covers the periphery of the core.

The coils 43 according to this embodiment are formed by winding wire around the teeth 41. The winding has a portion 43a wound around the teeth 41 and lead wires 43b located at both ends and drawn out from the teeth 41. The lead wires 43b are electrically connected to, for example, a power source (not shown) via the bus bar 5. In other words, the coils 43 are electrically connected to a power source (not shown). The stator 4 according to this embodiment has, for example, 18 coils 43.

The busbar 5 is formed, for example, from a conductive metal. As shown in FIG. 4, the motor 1 according to this embodiment has a plurality of first busbars 51 (see FIG. 1 and FIG. 2) and a plurality of second busbars 52 (see FIG. 6).

The first bus bar 51 is held by a first holder 61, which will be described later, and is disposed on one side of the first holder 61 in the axial direction A (see FIG. 1). The motor 1 according to this embodiment has multiple (e.g., three) first bus bars 51.

The end of the lead wire 43b of the coil 43 is electrically connected to the back surface of the first bus bar 51 on the other side in the axial direction A. The first bus bar 51 also has a main body 51a, a connection portion 51b, and a hole portion 51c. The main body 51a contacts the surface of the main body 61a of the first holder 61 in the axial direction A.

The connection portion 51b protrudes from the main body 51a toward one side in the radial direction R (the side away from the shaft 2), and then protrudes toward one side in the axial direction A (the side away from the stator 4). For example, the lead wire 43b of the coil 43 is connected to the connection portion 51b. The connection portion 51b has a connection surface 51bf on the outside in the radial direction R. Incidentally, the first bus bar 51 is disposed on one side in the axial direction A with respect to the stator 4, as shown in FIG. 1. Therefore, the connection surface 51bf is disposed adjacent to the outer periphery 4o of the stator 4 in the axial direction A.

As shown in FIG. 4, the holes 51c penetrate the main body 51a in the axial direction A. The first bus bar 51 according to this embodiment has a plurality of holes 51c. Some of the holes 51c engage with the first protrusion 61d formed on the first holder 61 (see FIG. 1), and the remaining holes 51c are inserted with the terminals 7 (described later) (see FIG. 1).

The second busbar 52 is held by a second holder 62, which will be described later, and is disposed on a surface located on one side of the body 62a of the second holder 62 in the axial direction A (see FIG. 6). The motor 1 according to this embodiment has multiple (e.g., 15) second busbars 52.

The other back surface of the second busbar 52 in the axial direction A is electrically connected to the end of the lead wire 43b of the coil 43. The second busbar 52 in this embodiment is a predetermined distance away from the terminal 7 attached to the second holder 62 and is not in contact with the terminal 7.

The multiple second bus bars 52 include a second bus bar 521 having a body 521a with a portion 521a1 extending in the circumferential direction C and a portion 521a2 extending in the radial direction R, and a second bus bar 522 having a body 522a composed of a portion extending in the circumferential direction C.

The second bus bar 521 has a body 521a, a connection portion 521b, and a hole portion 521c. The body 521a is inserted into a groove portion 62b formed in the body 62a of the second holder 62 and comes into contact with the body 62a of the second holder 62.

The connection portion 521b protrudes from the main body 521a toward one side in the radial direction R (the side away from the shaft 2), and then protrudes toward one side in the axial direction A (the side away from the stator 4). For example, the lead wire 43b of the coil 43 is connected to the connection portion 521b. The connection portion 521b has a connection surface 521bf facing outward in the radial direction R. Incidentally, one of the second bus bars 521 is disposed on one side in the axial direction A with respect to the stator 4, as shown in FIG. 1. Therefore, the connection surface 521bf is disposed adjacent to the outer periphery 4o of the stator 4 in the axial direction A.

As shown in FIG. 4, the holes 521c penetrate the main body 521a in the axial direction A. The second bus bar 52 according to this embodiment has a plurality of holes 521c. The protrusions 62d formed on the second holder 62 are inserted into the plurality of holes 521c.

The other second bus bar 522 has a body 522a, a connection portion 522b, and an engagement portion 522c. The body 522a is inserted into a groove portion 62b formed in the body 62a of the second holder 62 and comes into contact with the body 62a of the second holder 62.

The connection portion 522b protrudes from the main body 522a toward one side in the radial direction R (the side away from the shaft 2), and then protrudes toward one side in the axial direction A (the side away from the stator 4). For example, a terminal of another device is connected to the connection portion 522b. The connection portion 522b has a connection surface 522bf facing outward in the radial direction R. Meanwhile, the other second busbar 522 is disposed on one side in the axial direction A with respect to the stator 4, as shown in FIG. 1. Therefore, the connection surface 522bf is disposed adjacent to the outer periphery 4o of the stator 4 in the axial direction A.

The engaging portion 522c is formed at the end of the main body 522a in the circumferential direction C. In addition, as shown in Figs. 7 and 8, the engaging portion 522c according to this embodiment is disposed at the center of the main body 522a in the radial direction R when viewed from the axial direction A. In other words, as shown in Fig. 7, the engaging portion 522c is formed line-symmetrically with respect to the center line 522CL of the main body 522a. The engaging portion 522c is formed, for example, in a semicircular arc shape. As shown in Figs. 7 and 8, the engaging portion 522c is disposed at a position in the circumferential direction C away from the location where the connecting portion 522b is disposed. The engaging portion 522c engages with a protrusion 62d formed on the second holder 62, which will be described later.

The holder 6 is made of insulating resin. As shown in FIG. 5, the motor 1 according to this embodiment has a first holder 61 (see FIG. 1) and a second holder 62 (see FIG. 6).

When viewed from the axial direction A, the first holder 61 is formed in an annular shape and has an inner peripheral edge 61i located at the innermost position in the radial direction R and an outer peripheral edge 61o located at the outermost position in the radial direction R.

The first holder 61 has a main body 61a, a wall portion 61b formed on the surface of one side of the main body 61a in the axial direction A and extending in the circumferential direction C, a plurality of holes 61c formed in the main body 61a, a first protrusion 61d protruding from the surface of one side of the main body 61a in the axial direction A to one side in the axial direction A, and a second protrusion 61f protruding from the back surface of the main body 61a on the other side in the axial direction A toward the second holder 62 on the other side in the axial direction A. In addition, the first holder 61 has a recess (not shown) formed on the back surface of the other side of the main body 61a in the axial direction A and recessed from the back surface to the front surface in the axial direction A. Although not shown, a plurality of recesses are formed in the main body 61a.

The wall portions 61b are disposed between the multiple first bus bars 51. That is, the first holder 61 has multiple wall portions 61b extending in the circumferential direction C. The wall portions 61b are formed on the surface of one side of the axial direction A of the main body 61a of the first holder 61 so as to protrude to one side in the axial direction A. Therefore, the wall portions 61b can lengthen the creepage distance between one first bus bar 51 and the other first bus bar 51 among the multiple first bus bars 51 while preventing the size of the first holder 61 in the radial direction R from increasing.

The hole 61c is formed, for example, so as to penetrate the main body 61a in the axial direction A. The hole 61c is formed, for example, in a circular shape, and the terminal 7 is inserted through the hole 61c in the axial direction A.

The first protrusion 61d is formed, for example, in a cylindrical shape and is inserted into the hole 51c of the first busbar 51. After the first protrusion 61d is inserted into the hole 51c, the tip of the first protrusion 61d is crushed. The crushed tip of the first protrusion 61d is larger than the size of the hole 51c. Therefore, the first protrusion 61d can prevent the first busbar 51 from falling off the first holder 61.

When viewed from the axial direction A, the second holder 62 is formed in an annular shape and has an inner peripheral edge 62i that is located on the innermost side in the radial direction R, and an outer peripheral edge 62o that is located on the outermost side in the radial direction R.

The second holder 62 has a main body 62a, a groove portion (recess) 62b formed on the surface of one side of the main body 62a in the axial direction A, a plurality of holes 62c formed in the main body 62a, a protrusion 62d protruding from the surface of one side of the main body 61a in the axial direction A to one side in the axial direction A, and a recess 62f formed on the surface of one side of the main body 62a in the axial direction A and recessed toward the other side in the axial direction A.

The groove 62b is formed to be recessed from the surface on one side of the main body 62a in the axial direction A to the back surface on the other side, and is formed to be able to accommodate the main bodies 521a, 522a of the second busbar 52. A plurality of such grooves 62b are formed in the holder 6. The groove 62b also has a portion that extends in the circumferential direction C and a portion that extends in the radial direction R.

The hole 62c is formed, for example, so as to penetrate the main body 62a in the axial direction A. The hole 62c is formed, for example, in a circular shape.

The protrusion 62d is formed, for example, in a cylindrical shape. That is, the protrusion 62d is formed in a circular shape when viewed from the axial direction A. The second holder 62 according to this embodiment has a plurality of protrusions 62d. Some of the plurality of protrusions 62d are inserted into the hole portion 521c of one of the second bus bars 521, and the remaining of the plurality of protrusions 62d are engaged with the engagement portion 522c of the other second bus bar 522. The worker then engages the protrusion 62d with a recess formed on the back surface of the first holder 61 on the other side in the axial direction A. Therefore, after the second holder 62 holds the second bus bars 52, the protrusion 62d of the second holder 62 is engaged with the recess of the first holder 61, and the first holder 61 can be assembled to the second holder 62 in a state in which the second bus bars 52 are sandwiched between the first holder 61 and the second holder 62 in the axial direction A. The protrusion 62d may be inserted into the hole 521c, engaged with the engagement portion 522c, and then the tip of the first protrusion 61d may be crushed to prevent the second bus bars 52 from falling off the second holder 62. The second protrusion 61f is fitted into the recess 62f, and the first holder 61 is assembled to the second holder 62 by the recess 62f and the second protrusion 61f.

The terminals 7 are formed, for example, from a conductive metal. The motor 1 according to this embodiment has multiple terminals 7 (for example, three terminals) as shown in Figures 1, 2, 4, and 5.

The terminal 7 is formed, for example, in a cylindrical shape so as to extend in the axial direction A. The terminal 7 is inserted into the hole 61c of the first holder 61 and into the hole 62c of the second holder 62, and, for example, the other end of the terminal 7 in the axial direction A is fixed to the second holder 62. Each of the terminals 7 electrically connects the bus bar 5 to an external device (not shown). In the motor 1 according to this embodiment, the multiple terminals 7 are arranged along the radial direction R. The multiple terminals 7 are also arranged between the inner peripheral edge 62i and the outer peripheral edge 62o of the second holder 62. Furthermore, the multiple terminals 7 are arranged in a position that is off the multiple connection surfaces 521bf, 522bf in the circumferential direction C. In other words, the multiple terminals 7 are arranged in a position that does not overlap the multiple connection surfaces 521bf, 522bf when viewed from the radial direction R.

The cover may be formed, for example, from an insulating resin in an annular shape so as to cover the first holder 61 and the first bus bar 51 from one side in the axial direction A.

As described above, in the motor 1 according to this embodiment, the second holder 62 is provided with a protrusion 62d extending in the axial direction A, and the engagement portion 522c located at the end of the second bus bar 52 and the protrusion 62d are engaged in the circumferential direction C. The engagement portion 522c is formed in a semicircular arc shape when viewed from the axial direction A. If the engagement portion is configured as a hole that penetrates the main body 522a in the axial direction A, the engagement portion will be positioned so as to surround the entire circumference of the protrusion 62d. In order to ensure insulation, it is necessary to ensure a distance between the end of the second bus bar 52 having the engagement portion and the end of another bus bar 5 adjacent to the second bus bar 52 in the circumferential direction C, so there is a risk that the motor 1 will become larger in the circumferential direction C. On the other hand, in the motor 1 according to this embodiment, the engaging portion 522c is formed in a semicircular arc shape when viewed from the axial direction A, so that the distance between the second bus bar 52 having the engaging portion 522c and another bus bar 5 adjacent to the second bus bar 52 in the circumferential direction C can be secured while preventing the bus bar 52 from becoming too large in the circumferential direction C.

The motor 1 according to this embodiment is provided with a plurality of terminals 7 that are electrically connected to an external device, and the second holder 62 has an inner peripheral edge 62i and an outer peripheral edge 62o in the radial direction R of the second holder 62, and the plurality of terminals 7 are disposed between the inner peripheral edge 62i and the outer peripheral edge 62o.

The second busbar 52 according to this embodiment has multiple connection surfaces 521bf, 522bf arranged on the outer periphery 4o of the stator 4, and the multiple coils 43 are connected to the multiple connection surfaces 521bf, 522bf. Therefore, when connecting the terminals of other devices to the connection surfaces 521bf, 522bf, the worker's fingers can easily reach the connection surfaces 521bf, 522bf, improving workability.

In the motor 1 according to this embodiment, the terminal 7 is disposed at a position that is offset from the multiple connection surfaces 521bf, 522bf in the circumferential direction C. Therefore, when connecting an external device to the terminal 7, it is possible to prevent the connection surfaces 521bf, 522bf from coming into contact with the fingers of an operator, thereby improving workability.

In the busbar 5 according to the present embodiment, the connection portion 51b of the first busbar 51 and the connection portions 521b and 522b of the second busbar 52 are arranged side by side along the circumferential direction C. Therefore, in the radial direction R, it is possible to prevent a part of the connection portion 51b of the first busbar 51 from overlapping with a part of the connection portions 521b and 522b of the second busbar 52. Therefore, in the busbar 5 according to the present embodiment, when connecting terminals of other devices to the connection portions 51b, 521b, and 522b, the other connection portions 51b, 521b, and 522b that are not to be connected do not get in the way. As a result, in the busbar 5 according to the present embodiment, it is possible to suppress a decrease in workability when connecting terminals of other devices to the connection portions 51b, 521b, and 522b.

The engaging portion 522c according to the embodiment described above is formed in a semicircular arc shape when viewed from the axial direction A. However, the shape of the engaging portion 522c according to the present embodiment is not limited to this. When viewed from the axial direction A, the engaging portion 522c may be formed in a curved shape that is concave in the circumferential direction C toward the main body 522a of the other second bus bar 522, such as a curved shape that is half an ellipse or half an oval.

The protrusion 62d according to the embodiment described above is formed in a cylindrical shape and is formed in a circular shape when viewed from the axial direction A. However, the shape of the protrusion 62d according to the present embodiment is not limited to this as long as it can engage with the engagement portion 522c. In other words, the protrusion 62d may be formed in a cylindrical shape that protrudes from the main body 62a toward one side in the axial direction A and can engage with the engagement portion 522c. When viewed from the axial direction A, the protrusion 62d may be, for example, in the shape of a half ellipse, a half oval, a rectangle, etc.

Furthermore, in the motor 1 according to the embodiment described above, the other second bus bar 522 is described as having an engagement portion 522c that engages with the protrusion 62d of the second holder 62. However, the motor 1 according to the present embodiment is not limited to this. For example, one second bus bar 521 may have an engagement portion that engages with the protrusion 62d of the second holder 62, or the first bus bar 51 may have an engagement portion that engages with the first protrusion 61d of the first holder 61. Furthermore, a protrusion may be provided on the other side of the axial direction A in the first holder 61, and the engagement portion 522c of the second bus bar 522 may engage with the protrusion.

[Second embodiment]
Next, the motor 1A according to the second embodiment will be described with reference to FIGS. 9 to 13. FIG. 9 is a perspective view of the motor 1A according to the second embodiment. FIG. 10 is a perspective view of the bus bar 5A included in the motor 1A shown in FIG. 9. FIG. 11 is a plan view of the motor 1A shown in FIG. 9. FIG. 12 is a perspective view of the holder 6A included in the motor 1A shown in FIG. 9. FIG. 13 is a perspective view of the stator 4, the second bus bar 52A, and the second holder 62A included in the motor 1A shown in FIG. 9. Note that in the configuration of the motor 1A according to the second embodiment, the same components as those in the motor 1 according to the first embodiment are denoted by the same reference numerals and will not be described. Furthermore, in FIG. 11, for convenience of explanation, the cover 8 covering one side of the first holder 61A in the axial direction A is omitted. Note that the bus bar 5A, the holder 6A, and the terminal 7A of the motor 1A according to the second embodiment are different from the bus bar 5, the holder 6, and the terminal 7 of the motor 1 according to the first embodiment.

As shown in FIG. 9, the motor 1A according to this embodiment includes a shaft 2, a rotor 3, a stator 4, a bus bar 5A, a holder 6A, a terminal 7A, and a cover 8.

The busbar 5A according to the second embodiment has a first busbar 51A and a second busbar 52A, as shown in FIG. 10, similar to the busbar 5 according to the first embodiment.

Motor 1A is provided with multiple first bus bars 51A. The first bus bar 51A has a main body 51a, a connection portion 51b, a hole portion 51c, and a hole portion 51d.

The hole 51c penetrates the main body 51a in the axial direction A. The first bus bar 51A according to this embodiment has multiple holes 51c. When viewed from the axial direction A, the hole 51c is positioned farther away from the connection portion 51b than the hole 51d. Some of the multiple holes 51c are inserted into the first protrusion 61d formed on the first holder 61A, and the terminal 7A is inserted into the remaining portion of the multiple holes 51c.

The hole 51d penetrates the main body 51a in the axial direction A. The radial size of the hole 51d is different from the radial size of the hole 51c. More specifically, the radial size of the hole 51d is smaller than the radial size of the hole 51c. The first bus bar 51A according to this embodiment has a plurality of holes 51d. The hole 51d is disposed adjacent to the connection portion 51b in the radial direction R. The lead wire 43b is inserted into the hole 51d, and the lead wire 43b and the first bus bar 51A are electrically connected.

The motor 1A is provided with a plurality of second bus bars 52A. The plurality of second bus bars 52 include a second bus bar 521 having a body 521a with a portion 521a1 extending in the circumferential direction C and a portion 521a2 extending in the radial direction R, and a second bus bar 522 having a body 522a composed of a portion extending in the circumferential direction C.

The second bus bar 521 has a body 521a, a connection portion 521b, a hole portion 521c, and a hole portion 521d. The body 521a is disposed on one surface of the body 62a of the second holder 62A in the axial direction A, and is in contact with the body 62a of the second holder 62A.

The hole 521c penetrates the main body 521a in the axial direction A. One of the second busbars 521 according to this embodiment has multiple holes 521c. When viewed from the axial direction A, the hole 521c is positioned farther away from the connection portion 521b than the hole 521d. The hole 521c engages with the second protrusion 61f formed on the first holder 61A in the axial direction A.

The hole 521d penetrates the main body 521a in the axial direction A. The radial size of the hole 521d is smaller than the radial size of the hole 521c. One of the second bus bars 521 according to this embodiment has a plurality of holes 521d. The hole 521d is disposed adjacent to the connection portion 521b. The lead wire 43b is inserted into the hole 521d, and the lead wire 43b and one of the second bus bars 521 are electrically connected.

The other second bus bar 522 has a body 522a, a connection portion 522b, a hole portion 522d, and a hole portion 522e. The body 522a is disposed in the body 62a of the second holder 62A and contacts the body 62a of the second holder 62A.

The hole 522d has a shape that penetrates the main body 522a in the axial direction A. The second bus bar 52A according to this embodiment has multiple holes 522d. Furthermore, the hole 522d engages with the second protrusion 61f formed on the first holder 61A in the axial direction A.

The hole 522e penetrates the main body 521a in the axial direction A. The radial size of the hole 522e is smaller than the radial size of the hole 522d. The other second bus bar 522 according to this embodiment has a plurality of holes 522e. The hole 522e is disposed adjacent to the connection portion 522b. The lead wire 43b is inserted into the hole 522e, and the lead wire 43b and the other second bus bar 522 are electrically connected.

The holder 6A according to the second embodiment, like the holder 6 according to the first embodiment, has a first holder 61A and a second holder 62A as shown in FIG. 12. The second holder 62A serves as a cover that covers the first holder 61A.

The first holder 61A has a main body 61a, a groove portion (recess) 61e, a hole portion 61c, a first protrusion 61d, and a second protrusion 61f.

The groove 61e is formed on one surface of the main body 61a in the axial direction A, and is recessed from the one surface of the main body 61a to the other back surface in the axial direction A. The groove 61e has a portion that extends in the circumferential direction C and a portion that extends in the radial direction R.

The hole 61c is formed to penetrate the main body 61a in the axial direction A. The first protrusion 61d protrudes from one surface of the main body 61a on one side in the axial direction A to one side in the axial direction A. The second protrusion 61f protrudes from the back surface of the main body 61a on the other side in the axial direction A to the other side in the axial direction A.

The second holder 62A has a main body 62a, a hole 62c, and a hole 62e. The hole 62c is formed to penetrate the main body 62a in the axial direction A, and the terminal 7A is inserted through it. The second protrusion 61f of the first holder 61A is inserted through the hole 62e. The part of the second protrusion 61f protruding from the hole 62e is crushed by heat or the like, and the second holder 62A is fixed to the first holder 61A by crimping with the second protrusion 61f.

The terminals 7 are formed, for example, from a conductive metal. As shown in Figures 10, 11, and 12, the motor 1A according to this embodiment has a plurality of terminals 7A (for example, three). In the motor 1A according to this embodiment, two of the three terminals 7A are arranged along the circumferential direction C, and the remaining terminal 7A is arranged at a position offset from the circumferential direction C relative to the two terminals 7A. It is noted that all of the terminals 7A may be arranged along the circumferential direction C.

The terminal 7A is inserted into the hole 61c of the first holder 61A and into the hole 62c of the second holder 62A. Furthermore, the terminal 7A inserted into the hole 51c of the first bus bar 51A is electrically connected to the first bus bar 51A. Furthermore, the terminal 7A is inserted into the hole 51c of the first bus bar 51A. Therefore, the first bus bar 51A is electrically connected to the terminal 7A. Furthermore, the first bus bar 51A is electrically connected to the coil 43, and the second bus bar 52A is electrically connected to the coil 43. As a result, a current flows from the terminal 7A to the coil 43 electrically connected to the first bus bar 51A, and a current flows to the coil 43 electrically connected to the second bus bar 52A.

The cover 8 is formed, for example, from an insulating resin in an annular shape so as to cover the first bus bar 51 from one side in the axial direction A. The cover 8 has a main body 81a and a hole portion (not shown) formed in the main body 81a. The hole portion has a shape that penetrates the main body 81a in the axial direction A. The first protrusion portion 61d of the first holder 61A or the terminal 7A is inserted into the hole portion.

The multiple terminals 7A are arranged in positions that are offset from the connection parts 51b, 521b, and 522b of the busbar 5A in the radial direction R. Therefore, when electrically connecting the terminals 7A to the terminals of the external device, the operator's fingers can be prevented from coming into contact with the connection parts 51b, 521b, and 522b, improving workability. Furthermore, in the motor 1A according to this embodiment, the multiple terminals 7A are arranged along the circumferential direction C, so that when electrically connecting one of the multiple terminals 7A to an external device, the remaining terminals 7A can be prevented from coming into contact with the operator's fingers, improving workability.

In the motor 1A according to the embodiment described above, the second protrusion 61f of the first holder 61A is inserted into the hole 522d of the other second bus bar 522. However, the motor 1A according to this embodiment may be provided with an engagement portion on the other second bus bar 52A, and the second holder 62A may be provided with a protrusion that can engage with the engagement portion, similar to the motor 1 according to the first embodiment.

The motor 1 according to the first embodiment and the motor 1A according to the second embodiment are described as being of the inner rotor type. However, the motors 1 and 1A according to the present embodiment are not limited to this. For example, the motors 1 and 1A according to the present embodiment can be applied to an outer rotor side in which the stator 4 is located inside the rotor 3 in the radial direction R when viewed from the axial direction A.

The above has been an explanation based on the embodiments of the motors 1 and 1A according to the present invention, but it goes without saying that the present invention is not limited to the embodiments, and various modifications are possible within the scope of the gist of the present invention. The present invention also includes configurations that combine the components of the above-mentioned embodiments as appropriate. Such modifications that do not depart from the scope of the gist are also included in the technical scope of the present invention, and this will be clear to those skilled in the art from the description of the claims.

1, 1A motor, 2 shaft, 3 rotor, 4 stator, 4o outer periphery, 43 coil, 5, 5A busbar, 52, 52A second busbar (busbar), 521bf connection surface, 522bf connection surface, 522c engagement portion, 6, 6A holder, 62, 62A second holder (holder), 62d protrusion, 62i inner periphery, 62o outer periphery, 7, 7A terminal, A axial direction, C circumferential direction, R radial direction

Claims (4)

A stator having a plurality of coils;
A plurality of bus bars;
a holder for holding the bus bars;
Equipped with
The holder is provided with a protrusion extending in an axial direction,
an end of the bus bar and the protruding portion are engaged with each other in a circumferential direction;
motor. A plurality of terminals for electrically connecting to an external device are provided,
The holder has an inner peripheral edge and an outer peripheral edge in a radial direction,
The terminals are disposed between the inner periphery and the outer periphery.
2. The motor according to claim 1. the bus bars each include a plurality of connection surfaces disposed adjacent an outer periphery of the stator;
The coils are connected to the connection surfaces.
The motor according to claim 2. The terminal is disposed at a position offset from the plurality of connection surfaces in the circumferential direction.
The motor according to claim 3.

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