CN210578010U

CN210578010U - Motor with a stator having a stator core

Info

Publication number: CN210578010U
Application number: CN201890000552.4U
Authority: CN
Inventors: 小川幸祐; 瀬口敬史; 村上俊辅; 新子刚央
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2017-02-28
Filing date: 2018-01-30
Publication date: 2020-05-19
Anticipated expiration: 2028-01-30
Also published as: WO2018159188A1; JPWO2018159188A1; JP7024776B2

Abstract

The motor has: a rotor that rotates around a central axis extending in the vertical direction; a stator having coil wires, and located radially outside the rotor; a bus bar connecting the coil lines; a bus bar holder which is positioned above the stator and supports the bus bar; and a cylindrical housing that surrounds the stator and the bus bar holder from a radial outside, the bus bar holder including: a main body portion made of a resin material; and a metal sheet fixed to the main body and provided with a contact surface facing downward, and a support surface facing upward and contacting the contact surface is provided on an inner peripheral portion of the housing.

Description

Motor with a stator having a stator core

Technical Field

The utility model relates to a motor.

Background

A structure in which a bus bar holder that supports a bus bar is fixed to a housing of a motor is known (for example, patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2009-219334

SUMMERY OF THE UTILITY MODEL

Problem to be solved by utility model

In general, in order to ensure insulation between the bus bars, the bus bar holder is made of an insulating material such as resin. On the other hand, in recent years, for the purpose of reducing the number of parts and simplifying the manufacturing process, a structure for securing electrical connection by an insertion process is increasingly employed. For example, when a connection terminal is provided on a bus bar and the connection terminal is inserted into a socket of an external device to secure connection, a reaction force at the time of insertion is applied to a bus bar holder. Therefore, it is desired to improve the load resistance of the bus bar holder.

In view of the above problems, an object of the present invention is to improve the load-resisting performance of a bus bar holder.

Means for solving the problems

The utility model discloses a motor of mode has: a rotor that rotates around a central axis extending in the vertical direction; a stator having coil wires and located radially outside the rotor; a bus bar connecting the coil lines; a bus bar holder which is positioned above the stator and supports the bus bar; and a cylindrical housing that surrounds the stator and the bus bar holder from a radially outer side, the bus bar holder having: a main body portion made of a resin material; and a metal sheet fixed to the main body and provided with a contact surface facing downward, and a support surface facing upward and contacting the contact surface is provided on an inner peripheral portion of the housing.

Effect of the utility model

According to an aspect of the present invention, there is provided a motor having improved load resistance of a bus bar holder.

Drawings

Fig. 1 is a perspective view of a motor according to an embodiment.

Fig. 2 is a cross-sectional view along a central axis of a motor of one embodiment.

Fig. 3 is an enlarged view of a region III of fig. 2.

Fig. 4 is a sectional view showing a support structure of the main body portion to the bus bar.

Fig. 5 is a schematic diagram showing an electric power steering apparatus according to an embodiment.

Detailed Description

Hereinafter, a motor according to an embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention. In the drawings below, in order to facilitate understanding of each structure, the actual structure may be different from the scale, the number, and the like of each structure. In the following description, each configuration will be described with the direction in which the central axis J extends being the vertical direction. The posture of the motor 1 is not limited to the posture in the following description.

Fig. 1 is a perspective view of a motor 1 according to an embodiment. Fig. 2 is a sectional view along the central axis J of the motor 1. Fig. 3 is an enlarged view of a region III of fig. 2.

As shown in fig. 2, the motor 1 includes a rotor 30 that rotates about a central axis J extending in the vertical direction, a stator 40 having a plurality of coils 43, an upper bearing 54, a lower bearing 55, a bearing holder 50, a housing 20, a plurality of bus bars 70, and a bus bar holder 60 that supports the bus bars.

[ Shell ] for a refrigerator

The housing 20 has a bottomed cylindrical shape surrounding the stator 40, the bearing holder 50, and the bus bar holder 60 from the radially outer side. The housing 20 is open at the upper side. The opening on the upper side of the housing 20 is covered with a bearing holder 50.

The housing 20 has a cylindrical portion 20a and a bottom portion 20 b. The cylindrical portion 20a is a cylinder extending along the central axis J. The cylindrical portion 20a surrounds the stator 40 from the radially outer side. The bottom portion 20b covers the opening on the lower side of the tube portion 20 a. The bottom portion 20b is provided with a first holding hole 20c through which the shaft 31 of the rotor 30 passes. The housing 20 holds the outer ring of the lower bearing 55 on the inner peripheral surface of the first holding hole 20 c. Further, a first brim 20d protruding radially inward is provided at the lower end of the inner peripheral surface of the first holding hole 20 c. The outer race of the lower bearing 55 is in contact with the upper surface of the first flange 20 d.

The tube portion 20a has an inner peripheral portion 21 that surrounds the stator 40, the bearing holder 50, and the bus bar holder 60 from the outside in the radial direction. The housing 20 holds the stator 40, the bearing holder 50, and the bus bar holder 60 in the inner peripheral portion 21.

As shown in fig. 3, the inner circumferential portion 21 has a stepped portion 21a, a large diameter portion 21b located above the stepped portion 21a, and a small diameter portion 21c located below the stepped portion 21 a.

The step portion 21a has a support surface 22 facing upward. The bearing surfaces 22 extend uniformly in the circumferential direction. The radially outer end of the bearing surface 22 is connected to the large diameter portion 21 b. Further, the radially inner end of the bearing surface 22 is connected to the small diameter portion 21 c.

The large diameter portion 21b has an inner diameter larger than that of the small diameter portion 21 c. The inner peripheral surface of the large diameter portion 21b contacts the outer peripheral surface 50b of the bearing holder 50. The inner peripheral surface of the small diameter portion 21c contacts the outer peripheral surface 41a of the stator 40.

[ ROTOR ]

As shown in fig. 2, rotor 30 includes shaft 31, rotor core 32, and rotor magnet 33. The shaft 31 is centered on a central axis J extending in the vertical direction.

The shaft 31 is supported by a lower bearing 55 and an upper bearing 54 so as to be rotatable about the center axis J. The lower end of the shaft 31 protrudes to the lower side of the bottom 20 b. The lower end of the shaft 31 is connected to a transmission member such as a gear or a coupling, and outputs torque.

The rotor core 32 is fixed to the outer peripheral surface of the shaft 31. The rotor core 32 circumferentially surrounds the shaft 31. The rotor core 32 is located between the lower bearing 55 and the upper bearing 54 in the vertical direction. The rotor magnet 33 is a permanent magnet.

Rotor magnet 33 is fixed to an outer surface of rotor core 32 along the circumferential direction.

[ Upper and lower side Bearings ]

The upper bearing 54 rotatably supports the upper portion of the shaft 31. The upper bearing 54 is located on the upper side of the stator 40. The lower bearing 55 rotatably supports a lower portion of the shaft 31. The lower bearing 55 is located at the lower side of the stator 40.

In the present embodiment, the upper bearing 54 and the lower bearing 55 are ball bearings. However, the types of the upper bearing 54 and the lower bearing 55 are not particularly limited, and other types of bearings may be used.

[ Bearings-holder ]

The bearing holder 50 is located at an upper side of the stator 40. The bearing holder 50 has a circular plate shape centered on the central axis J. The outer peripheral surface 50b of the bearing holder 50 is fixed to the inner peripheral portion 21 of the housing 20.

The bearing holder 50 is provided with a second holding hole 50c penetrating in the vertical direction and two terminal insertion holes 51. The terminal insertion holes 51 are inserted with 3 connection terminals 77 (see fig. 1).

The second holding hole 50c is located at the center of the bearing holder 50 in a plan view. The shaft 31 passes through the second holding hole 50 c. The bearing holder 50 holds the outer ring of the upper bearing 54 on the inner peripheral surface of the second holding hole 50 c. Further, a second brim 50d protruding radially inward is provided at the upper end of the inner peripheral surface of the second holding hole 50 c. The outer race of the upper bearing 54 contacts the lower surface of the second flange 50 d.

[ STATOR ]

The stator 40 is located radially outward of the rotor 30. The stator 40 includes a stator core 41, an insulator 42, and a coil 43. The coil 43 is constituted by a coil wire 43 a. That is, the stator 40 has coil wires 43 a. The stator 40 is fixed to the inner peripheral portion 21 of the housing 20 on the outer peripheral surface 41a of the stator core 41.

The insulating member 42 is made of an insulating material. The insulator 42 covers at least a portion of the stator core 41.

The coil 43 is formed by winding a coil wire 43a around the stator 40 with an insulator 42 interposed therebetween. When the motor 1 is driven, the coil 43 excites the stator core 41. The coil wire 43a constituting the coil 43 is drawn out to the coil wire connecting portion 71 of the bus bar 70.

The bus bar 70 has a coil wire connection portion 71, a connection terminal 77, and a connection portion 72 connecting the coil wire connection portion 71 and the connection terminal 77. That is, the motor 1 has a connection terminal 77 electrically connected to the external device 9. In the present embodiment, the connection terminal 77 and the bus bar 70 are connected to each other, but the connection terminal 77 and the bus bar 70 may be separate members.

The bus bar 70 is formed by pressing a conductive metal plate. The thickness direction of the coupling portion 72 coincides with the axial direction. On the other hand, the thickness direction of the coil wire connecting portion 71 and the connection terminal 77 is perpendicular to the axial direction. The coil wire connecting portion 71 and the connection terminal 77 are formed by bending in the axial direction with respect to the connection portion 72.

The coil wire connecting portion 71 is electrically connected to the coil wire 43 a. The coil wire connecting portion 71 has, for example, a U-shape in which the coil wire 43a is sandwiched. The coil wire connecting portion 71 and the coil wire 43a are fixed to each other by welding and electrically connected. Specifically, the coil wire connecting portion 71 is sandwiched in the circumferential direction by two electrodes in a state where the coil wire 43a is sandwiched in the circumferential direction and resistance-welded, thereby connecting the coil wire connecting portion 71 and the coil wire 43 a. The coil wire connection portion 71 and the coil wire 43a may be fixed by welding other than resistance welding such as arc welding, plastic deformation such as caulking, soldering, adhesion of a conductive adhesive, or the like.

The connection terminal 77 extends in the up-down direction. The connection terminal 77 protrudes above the bearing holder 50 through the terminal insertion hole 51 provided in the bearing holder 50. The connection terminal 77 is inserted into a socket of the external device 9 on the upper side of the bearing holder 50 to be electrically connected to the external device 9.

The bus bar holder 60 is located above the stator 40 with a gap therebetween. The busbar holder 60 is located below the bearing holder 50 with a gap therebetween. That is, the bus bar holder 60 is not in contact with the stator 40 and the bearing holder 50, and is positioned between the stator 40 and the bearing holder 50.

The bus bar holder 60 has a circular plate shape. As shown in fig. 2, a center hole 60c through which the shaft 31 passes is provided in the center of the bus bar holder 60. As shown in fig. 3, the bus bar holder 60 is provided with a plurality of coil wire insertion holes 60d through which the coil wires 43a are inserted. The coil wire 43a is connected to the coil wire connecting portion 71 of the bus bar 70 on the upper side of the bus bar holder 60 through the coil wire insertion hole 60 d.

As shown in fig. 2, the bus bar holder 60 includes a main body portion 61 made of a resin material and a plate-shaped metal plate (metal piece) 65 made of a metal material. The body portion 61 is formed by insert molding with a part of the metal plate 65 embedded therein. That is, the bus bar holder 60 is an insert molded product. The metal plate 65 has a circular plate shape. The body 61 covers the surface of the metal plate 65 so that a part of the surface of the metal plate 65 is exposed.

The metal plate 65 is partially embedded in the body 61 and fixed. In the present embodiment, the body portion 61 and the metal plate 65 are fixed by insert molding. However, the body portion 61 and the metal plate 65 may be fixed to each other by other methods such as fitting, as long as they are fixed to each other. The metal plate 65 has an outer diameter equal to or slightly smaller than the inner diameter of the large diameter portion 21b of the housing 20 and larger than the inner diameter of the small diameter portion 21c of the housing 20.

As shown in fig. 3, the metal plate 65 has an upper surface 65b and a lower surface 65 c. The metal plate 65 has an exposed portion 66 exposed from the main body portion 61. The exposed portion 66 includes an outer end face 65e of the metal plate 65 facing the radial direction outside and portions of the upper surface 65b and the lower surface 65c near the outer end face 65 e. According to the present embodiment, the metal plate 65 is covered with the main body portion 61 except for the exposed portion 66. This can provide the motor 1 that can ensure insulation between the coil wire 43a and the metal plate 65 of the bus bar holder 60 and can operate stably.

A contact surface 66a that contacts the support surface 22 of the housing 20 is provided in the radially outermost region of the lower surface 65c of the exposed portion 66. That is, the bus bar holder 60 is provided with a contact surface 66a facing downward.

According to the present embodiment, the bus bar holder 60 is supported by being in direct contact with the case 20 on the contact surface 66a of the metal plate 65. In addition, the bus bar holder 60 does not contact the stator 40 and the bearing holder 50. Therefore, the bus bar holder 60 can be positioned with respect to the housing 20 without depending on the dimensional accuracy of the stator 40 and the bearing holder 50. Therefore, the vertical position of the tip of the connection terminal 77 supported by the bus bar holder 60 can be accurately positioned, and electrical conduction with the external device 9 can be stabilized.

Further, according to the present embodiment, since the contact surface 66a of the bus bar holder 60 that contacts the housing 20 is made of a metal material, the dimensional accuracy and flatness of the contact surface 66a can be improved. This can easily improve the vertical positional accuracy of the bus bar holder 60 with respect to the housing 20, and as a result, can improve the vertical positional accuracy of the distal ends of the connection terminals 77.

According to the present embodiment, since the bus bar holder 60 has the metal plate 65, the bus bar holder 60 is reinforced, and the load resistance in the vertical direction of the bus bar holder 60 is improved. When the connection terminal 77 is connected to the external device 9, stress directed downward is applied to the bus bar holder 60 via the connection terminal 77. According to the present embodiment, the load resistance of the bus bar holder 60 can be sufficiently improved against the reaction force when the connection terminal 77 is inserted.

According to the present embodiment, the contact surface 66a of the bus bar holder 60 that contacts the case 20 is formed of the metal plate 65, so that the strength of the contact surface 66a on which stress is concentrated can be sufficiently increased. That is, even when the area of the contact surface 66a is reduced, sufficient strength can be imparted to the bus bar holder 60. This can reduce the area of the support surface 22 of the housing 20 that contacts the contact surface 66a, and as a result, the radial dimension of the housing can be reduced.

As shown in fig. 3, the area of the portion of the metal plate 65 facing the main body portion 61 in the vertical direction is larger than the area of the portion of the contact surface 66a facing the support surface 22 in the vertical direction. That is, according to the present embodiment, the contact area between the metal plate 65 and the resin body portion 61 can be sufficiently ensured. Therefore, stress is dispersed in the contact portion between the metal plate 65 and the main body portion 61, and excessive stress is suppressed from being applied to the main body portion 61, thereby improving the load-bearing performance of the bus bar holder 60.

The portion included in the upper surface 65b of the exposed portion 66 is located radially outward of the contact surface 66 a. That is, at least a part of the upper surface of the contact surface 66a of the metal plate 65 is covered with the body 61. When an external force is applied to the connection terminal 77, the contact surface 66a receives stress as a reaction force from the housing 20. According to the present embodiment, a part of the body portion 61 can support the contact surface 66a from the rear in the stress direction.

The metal plate 65 is located below the connection terminal 77 of the bus bar 70 with a part of the body portion 61 interposed therebetween. That is, the metal plate 65 overlaps the connection terminal 77 when viewed from the vertical direction. As described above, the external force in the downward direction is applied to the connection terminal 77 when inserted into the external device 9. According to the present embodiment, the metal plate 65 is disposed below the connection terminal 77, and the metal plate 65 directly receives the reaction force at the time of insertion. Therefore, the load resistance of the bus bar holder 60 against the reaction force at the time of insertion of the connection terminal 77 can be improved.

The metal plate 65 is provided with a through hole 65a penetrating in the vertical direction. The inner peripheral surface of the through hole 65a is covered with the covering portion 61c of the body portion 61. The inner peripheral surface of the covering portion 61c constitutes a coil wire insertion hole 60d through which the coil wire 43a passes. The covering portion 61c ensures insulation between the coil wire 43a and the metal plate 65. The covering portion 61c also functions as an anchor in insert molding. That is, by providing the covering portion 61c, the metal plate 65 and the main body portion 61 are firmly fixed.

The main body portion 61 of the bus bar holder 60 has an upper surface 61a facing upward. The upper surface 61a is in contact with the lower surface of the bus bar 70. The bus bar holder 60 supports the bus bar 70 on the upper surface 61 a. That is, the bus bar holder 60 supports the bus bar 70 (particularly, the connection terminal 77) from below.

Fig. 4 is a sectional view showing a support structure of the main body 61 for the bus bar 70. A support protrusion 64 is provided on the upper surface 61a of the main body 61. The support projection 64 extends upward from the upper surface 61 a. Further, the connection portion 72 of the bus bar 70 is provided with a hole 72c penetrating in the vertical direction. The support projection 64 is inserted into the hole 72 c.

The support projection 64 has a shaft portion 64b and a head portion 64 a. The shaft portion 64b extends upward from the upper surface 61 a. The head portion 64a is located at the upper end of the shaft portion 64 b. In addition, the head 64a is located on the upper side of the bus bar 70. The diameter of the head portion 64a is larger than the diameter of the shaft portion 64 b. The head portion 64a is molded by heating the tip of the shaft portion 64 b. An assembly worker or the like inserts the shaft portion 64b into the hole 72c of the bus bar 70 in a state before the head portion 64a is molded, and heats the tip end of the shaft portion 64b to mold the head portion 64 a. In addition, according to the present embodiment, the bus bar 70 is pressed against the bus bar holder 60 during heating, thereby being fixed by thermal welding. Therefore, the positioning accuracy of the bus bar 70 with respect to the bus bar holder 60 in the vertical direction can be improved.

As shown by the two-dot chain line in fig. 3, the main body portion 61 of the bus bar holder 60 may be provided with an extending portion 162 extending in the vertical direction. That is, the bus bar holder 60 may also have the extension portion 162.

The extension portion 162 is located at the radially outer end of the main body portion 61 and extends in a circumferential direction in an annular shape. The extension 162 is located on the upper side of the metal plate 65. The extension 162 is radially opposed to the inner peripheral portion 21 of the housing 20. The extension 162 is in surface contact with the inner peripheral portion 21 of the housing 20. According to this configuration, the bus bar holder 60 can be positioned in the radial direction with respect to the housing 20 by bringing the extension portion 162 into contact with the inner peripheral portion 21 of the housing 20. Further, the extending portion 162 extends in the vertical direction, and the contact surface between the extending portion 162 and the inner peripheral portion 21 extends in the vertical direction, whereby the inclination of the center axis of the bus bar holder 60 with respect to the center axis of the housing 20 can be suppressed.

In the present embodiment, the case where the extending portion 162 is in surface contact with the inner circumferential portion 21 is exemplified, but the positioning in the radial direction can be performed as long as the extending portion 162 is in contact with the inner circumferential portion 21 at 3 points or more along the circumferential direction. In addition, as in the present embodiment, when the extension portion 162 is in surface contact with the inner peripheral portion 21, it can be understood that there are numerous contact points.

In the present embodiment, the case where the extending portions 162 extend in a circumferential annular shape is exemplified, but the extending portions may be ribs arranged in the circumferential direction. In the present embodiment, the case where the extending portion 162 is located above the metal plate 65 is exemplified, but may be located below the metal plate 65. In the present embodiment, the case where the extension portion 162 is a part of the body portion 61 is exemplified, but the extension portion 162 may be a part of the metal plate 65.

(modification example)

Next, a structure of a modification example that can be adopted in the motor 1 of the present embodiment will be described. The same reference numerals are given to the same constituent elements as those of the above-described embodiment, and the description thereof will be omitted.

As shown by the two-dot chain line in fig. 3, the motor of the present modification includes a pair of (two)

substrates

107 and 108 and a press-fit terminal 106 for connecting the

substrates

107 and 108 to each other. The pair of

substrates

107 and 108 are located above the bus bar holder 60. The pair of

substrates

107 and 108 face each other with a gap therebetween in the vertical direction. Further, the lower one 108 of the pair of

substrates

107 and 108 is supported by the bus bar holder 60.

Openings

107a and 108a are provided in the pair of

substrates

107 and 108, respectively. The press-fit terminal 106 is inserted into the

openings

107a and 108a of the pair of

substrates

107 and 108 by press-fitting. Thereby, the pair of

substrates

107 and 108 are electrically connected to each other.

According to the present modification, the bus bar holder 60 receives stress associated with press-fitting of the press-fitting terminal 106 connecting the pair of

substrates

107, 108. Since the bus bar holder 60 includes the metal plate 65, the load resistance against the stress associated with the press-fitting can be sufficiently improved. Therefore, even when the press-fit terminal 106 is used, the bus bar holder 60 does not need to be thick, and as a result, the size of the motor 1 in the vertical direction can be reduced.

Electric power steering device

Next, an embodiment of a device in which the motor 1 of the present embodiment is mounted will be described. Here, an example in which the motor 1 is mounted on the electric power steering apparatus will be described. Fig. 5 is a schematic diagram showing an electric power steering apparatus 2 according to an embodiment.

The electric power steering apparatus 2 is mounted on a steering mechanism of a wheel of an automobile. The electric power steering apparatus 2 of the present embodiment is a rack-type power steering apparatus that directly reduces steering force by the power of the motor 1. The electric power steering apparatus 2 includes a motor 1, a steering shaft 914, and an axle 913.

The steering shaft 914 transmits an input from a steering 911 to an axle 913 having wheels 912. The power of the motor 1 is transmitted to the axle 913 through a ball screw, not shown. The motor 1 employed in the rack-type power steering apparatus 2 is attached to the axle 913 and exposed to the outside, and therefore a waterproof structure is required.

Since the electric power steering apparatus 2 of the present embodiment includes the motor 1 described above, the electric power steering apparatus 2 enjoying the effect of the motor 1 is obtained. Here, the power steering apparatus 2 is exemplified as an example of a method of using the motor 1 of the present embodiment, but the method of using the motor 1 is not limited.

While the embodiment and the modified examples of the present invention have been described above, the configurations and combinations thereof in the embodiment are only examples, and additions, omissions, substitutions, and other modifications of the configurations may be made without departing from the scope of the present invention. The present invention is not limited to the embodiments.

For example, in the above-described embodiment, the case where the plate-shaped metal plate 65 is used has been described, but a block-shaped metal sheet may be used instead of the metal plate 65 as long as the metal plate 65 has the same function.

Description of the reference symbols

1: a motor; 9: an external device; 20: a housing; 21: an inner peripheral portion; 22: a bearing surface; 30: a rotor; 40: a stator; 43: a coil; 43 a: a coil wire; 60: a bus bar holder; 61: a main body portion; 65: a metal plate (metal sheet); 66 a: a contact surface; 70: a bus bar; 77: a connection terminal; 106: pressing the terminal; 107. 108: a substrate; 107a, 108 a: an opening part; 162: an extension portion; j: a central axis.

Claims

1. A motor, comprising:

a rotor that rotates around a central axis extending in the vertical direction;

a stator having coil wires and located radially outside the rotor;

a bus bar connecting the coil lines;

a bus bar holder which is positioned above the stator and supports the bus bar; and

a cylindrical housing that surrounds the stator and the bus bar holder from a radially outer side,

the bus bar holder has:

a main body portion made of a resin material; and

a metal sheet fixed to the main body and provided with a contact surface facing downward,

a support surface that faces upward and contacts the contact surface is provided on an inner peripheral portion of the housing.

2. The motor of claim 1,

the bus bar holder is an insert-molded article.

3. The motor of claim 1,

the motor has a connection terminal extending in the up-down direction and electrically connected to an external device,

the bus bar holder supports the connection terminal from a lower side,

the metal piece overlaps with the connection terminal when viewed from the up-down direction.

4. The motor of claim 1,

at least a part of an upper surface of the contact surface of the metal sheet is covered with the main body.

5. The motor of claim 1,

the area of a portion of the metal piece facing the main body portion in the vertical direction is larger than the area of a portion of the contact surface facing the support surface in the vertical direction.

6. The motor of claim 1,

the bus bar holder has an extending portion that extends in the vertical direction, faces the inner peripheral portion of the housing in the radial direction, and contacts the inner peripheral portion at 3 points or more.

7. The motor of claim 1,

the bus bar holder and the stator are vertically opposed to each other with a gap therebetween.

8. The motor of claim 1,

the motor comprises two substrates which are positioned above the bus bar holder and stacked with a gap in the vertical direction,

the two substrates are connected to each other by press-fitting terminals that are press-fitted into openings provided in the two substrates, respectively.