CN217849073U - Motor and electronic device - Google Patents

Abstract

The utility model provides a motor and electronic equipment. The motor has: a rotor including a shaft disposed along a central axis extending vertically and a magnet fixed to the shaft; a stator having a coil disposed diametrically opposite the magnet; a substrate electrically connected to the coil; and a first metal housing that houses at least a part of the rotor and the stator. The substrate and the radially outer surface of the first housing are electrically connected by a deformable conductive member.

Description

Motor and electronic device

Technical Field

The utility model relates to a motor and electronic equipment.

Background

A conventional motor includes a motor case, an electronic board, and an end cap. The motor housing is open in one axial direction, has a cutout portion at a portion of an edge of the open side, and holds the rotor rotatably inside. The electronic substrate is embedded in the cutout portion. The end cap presses the electronic substrate and is fixed to the motor case, covering the open portion of the motor case.

The electronic substrate includes a plurality of pad portions formed of a metal foil.

Each of a plurality of claws protruding in the axial direction from the end cap is pressed by each of a plurality of pads. This enables the claw portion to be reliably brought into contact with the pad portion without being displaced (patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2013-99094

SUMMERY OF THE UTILITY MODEL

However, the conventional motor has a problem that a large load is applied to the substrate.

An object of the utility model is to connect the base plate with motor housing electricity under the condition of not exerting big load to the base plate.

The motor of the exemplary embodiment of the present invention has: a rotor having a shaft disposed along a central axis extending vertically and a magnet fixed to the shaft; a stator having a coil disposed opposite to the magnet; a substrate electrically connected to the coil; and a first metal housing that houses at least a part of the rotor and the stator. The substrate is electrically connected to a radially outer surface of the first housing via a deformable conductive member.

In the above embodiment, at least a part of the substrate is disposed radially outward of the first case, and the substrate and the conductive member are electrically connected radially outward of the first case.

In the above embodiment, the first case is disposed above the substrate, the conductive member is electrically connected to the upper surface of the substrate, and the upper end of the conductive member is disposed below the upper end of the first case.

In the above embodiment, the stator includes: a stator core having an annular core back surrounding the central axis and pole teeth extending from the core back in a direction approaching the central axis; an insulator covering at least a portion of the teeth; and the coil formed by winding a lead wire around the insulator, at least a part of the insulator being in contact with an upper surface of the substrate in an axial direction.

In the above embodiment, the conductive member is in contact with the radially outer surface of the insulator in the radial direction.

In the above embodiment, the first case further includes a lead wire electrically connected to the lower surface of the substrate, and the lead wire is drawn out to the outside of the first case.

In the above embodiment, the rotor and the stator are disposed in the lower part of the substrate, and the lower surface of the substrate is in contact with the second housing.

The electronic device of the exemplary embodiment of the present invention includes the above motor.

According to the present invention, the substrate can be electrically connected to the motor case without applying a large load to the substrate.

The above and other features, elements, steps, features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the invention when taken in conjunction with the accompanying drawings.

Drawings

Fig. 1 is a perspective view of a motor according to an exemplary embodiment of the present invention.

Fig. 2 is a longitudinal sectional view of a motor according to an exemplary embodiment of the present invention.

Fig. 3 is an enlarged view of the longitudinal sectional view shown in fig. 2.

Fig. 4 is a perspective view of an electronic device according to an exemplary embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the present specification, in describing the motor 1, a direction parallel to the central axis J is referred to as an "axial direction", a direction perpendicular to the central axis J is referred to as a "radial direction", and a direction along an arc centered on the central axis J is referred to as a "circumferential direction". In the radial direction, a direction approaching the central axis J is referred to as "radially inner side", and a direction away from the central axis J is referred to as "radially outer side". In the present specification, the shapes and positional relationships of the respective parts will be described with the axial direction as the vertical direction and the stator 20 side as the upper side with respect to the substrate 40. The vertical direction is a name used for explanation only, and does not limit an actual posture, positional relationship, and direction.

In the positional relationship between any one of the orientation, line and plane and any other one of the orientation, line and plane, "parallel" includes not only a state in which both extend to such an extent that they do not intersect each other at all, but also a state in which they are substantially parallel. The terms "perpendicular" and "orthogonal" include not only a state where they intersect each other at 90 degrees, but also a substantially perpendicular state and a substantially orthogonal state. That is, "parallel", "perpendicular", and "orthogonal" include a state in which the positional relationship therebetween is not deviated by an angle to the extent that the gist of the present invention is not departed. In addition, the dimensions of the components or portions in the drawings are sometimes different from those in actual products.

Fig. 1 is a perspective view of a motor 1 according to an exemplary embodiment of the present invention. Fig. 2 is a longitudinal sectional view of the motor 1 of the exemplary embodiment of the present invention. More specifically, fig. 2 isbase:Sub>A vertical cross-sectional view of the motor 1 shown in fig. 1, taken along the cross-sectionbase:Sub>A-base:Sub>A, and viewed in the direction of the arrows in the figure. Fig. 3 is an enlarged view of the longitudinal sectional view shown in fig. 2. That is, fig. 3 is an enlarged view of the region R indicated by the broken line in fig. 2.

Referring to fig. 1 to 3, the motor 1 has a rotor 10, a stator 20, a base plate 40, and a first housing 50. In the present embodiment, the motor 1 further has a second housing 60.

The rotor 10 has a shaft 11 and a magnet 12. The shaft 11 is disposed along a central axis J extending vertically. The magnet 12 is fixed to the shaft 11.

More specifically, the rotor 10 also has a rotor holder 13. The rotor holder 13 includes: a cylindrical inner cylinder 131 extending in the axial direction; a bottom portion 132 extending radially outward from a lower end portion of the inner tube portion 131; and a cylindrical outer cylindrical portion 133 extending upward from the radially outer edge of the bottom portion 132.

The inner cylinder 131 is fixed to the shaft 11 on the radially inner side. The magnet 12 is fixed to the radially outer surface of the outer cylinder 133. The magnet 12 has a cylindrical shape extending in the axial direction. That is, the magnet 12 is fixed to the shaft 11 by the rotor holder 13.

The stator 20 has a stator core 21, an insulator 22, and a coil 23. The stator core 21 includes an annular core back 211 surrounding the central axis J, and pole teeth 212 extending from the core back 211 in a direction approaching the central axis J. A plurality of pole teeth 212 are arranged at substantially equal intervals in the circumferential direction.

The insulator 22 covers at least a portion of the tooth 212. The insulator 22 is made of an insulating material such as resin. The coil 23 is formed by winding a lead wire (not shown) around the insulator 22. That is, the coil 23 is formed by winding a lead wire around the tooth 212 with the insulator 22 interposed therebetween. The magnet 12 is disposed radially inward of the coil 23. That is, the stator 20 has a coil 23 disposed to be opposed to the magnet 12 in the radial direction.

The substrate 40 is disposed below the rotor 10 and the stator 20. The base plate 40 is a member of a plate-like portion extending in a direction substantially orthogonal to the central axis J. A plurality of electronic components (not shown) are arranged on the substrate 40. A hole penetrating in the axial direction is formed in the center of the base plate 40, and the shaft 11 penetrates through the hole.

The substrate 40 is electrically connected to the coil 23. That is, the lead wires forming the coil 23 are electrically connected to the substrate 40. In the present embodiment, the lead is electrically connected to the substrate 40 by being soldered to the substrate 40. The lower end of the insulator 22 is in axial contact with the upper surface of the substrate 40. That is, at least a portion of the insulator 22 is in contact with the upper surface of the base plate 40 in the axial direction. This can fix the substrate 40 to the stator 20 and position the substrate 40 in the axial direction.

A connector 41 is disposed on the lower surface of the substrate 40. The lead 42 is connected to the connector 41. Thereby, the substrate 40 is electrically connected to an external power supply via the connector 41 and the lead 42. The method of electrically connecting the substrate 40 to an external power supply may be another method.

The first housing 50 is disposed above the substrate 40. The first housing 50 houses at least a part of the rotor 10 and the stator 20. The first housing 50 is made of metal.

In the present embodiment, the first housing 50 includes: a cylindrical inner cylinder 51 extending in the axial direction; a top portion 52 extending radially outward from an upper end of the inner cylindrical portion 51; and a cylindrical outer cylinder 53 extending downward from the radially outer edge of the top portion 52. The inner cylinder portion 51 is disposed radially inward of the outer cylinder portion 133 of the rotor holder 13. The bearing 30 is disposed radially inward of the inner cylindrical portion 51. In the present embodiment, the bearing 30 is a ball bearing. The bearing 30 is in contact with a radially inner surface of the inner cylindrical portion 51 and a radially outer surface of the shaft 11. Thereby, the bearing 30 supports the rotor 10 rotatably about the center axis J with respect to the stator 20.

The top portion 52 is disposed above the magnet 12 and the stator 20. The outer cylindrical portion 53 is disposed radially outward of the stator 20. In the present embodiment, at least a part of the radially inner surface of the outer cylinder 53 radially contacts the radially outer surface of the insulator 22 and the radially outer surface of the core back 211. This can firmly fix the first housing 50 and the stator 20.

The lower end of the outer tube 53 is disposed above the upper surface of the substrate 40. That is, the lower end of the outer cylinder 53 is disposed above the lower end of the insulator 22. This can shorten the axial length of the outer tube 53, and thus can reduce the weight of the first housing 50.

At least a part of the substrate 40 is disposed radially outward of the first housing 50. That is, the radially inner side of the substrate 40 is disposed radially inward of the outer cylinder 53, and the radially outer side of the substrate 40 is disposed radially outward of the outer cylinder 53.

The second housing 60 is disposed below the first housing 50. In the present embodiment, the second housing 60 is made of resin. The second housing 60 has a cylindrical tube portion 61 extending in the axial direction and a bottom portion 62 extending radially inward from the lower end of the tube portion 61.

The second housing 60 houses at least a part of the rotor 10 and the stator 20. The second housing 60 is disposed below the substrate 40. The lower surface of the substrate 40 is in contact with the second housing 60. More specifically, the upper end of the cylindrical portion 61 is in axial contact with the lower surface of the substrate 40. This enables positioning of the substrate 40 and the second housing 60. In addition, when the second housing 60 is made of resin, the second housing 60 and the substrate 40 can be electrically insulated while being positioned. Further, as compared with the case where the second case 60 is made of metal, stress applied to the substrate 40 when the second case 60 is brought into contact with the substrate 40 can be reduced. In the present embodiment, the substrate 40 is fixed in the axial direction by the insulator 22 and the cylindrical portion 61.

The cylindrical portion 61 has a locking portion 611. The locking portion 611 is formed at the upper end of the tube 61. The locking portion 611 is disposed above the substrate 40. The locking portion 611 engages with the protrusion 222 of the insulator 22. Thereby, the stator 20 and the second housing 60 are fixed.

A notch 612 is formed at the upper end of the cylindrical portion 61. The notch 612 is a portion where the upper surface of the tube portion 61 is depressed downward. That is, in the region constituting the notch 612, the axial distance between the lower surface of the substrate 40 and the upper surface of the cylinder 61 is wider than that in other regions. The connector 41 protrudes radially outward from the tube portion 61 through the notch 612. That is, the radially inner side of the connector 41 is disposed radially inward of the cylindrical portion 61, and the radially outer side of the connector 41 is disposed radially outward of the cylindrical portion 61.

The radial position of the radially outer surface of the cylindrical portion 61 is substantially the same as the radial position of the radially outer surface of the outer cylindrical portion 53. That is, the radially outer side of the connector 41 is disposed radially outward of the first housing 50. In the present embodiment, the motor 1 has a lead wire 42. The lead 42 is electrically connected to the lower surface of the substrate 40. The lead 42 is led out from the first housing 50 to the outside. This enables the lead 42 to be electrically connected to the substrate 40 at a position radially outward of the first case 50, thereby improving mass productivity in manufacturing the motor 1.

A recess 621 recessed downward is formed substantially in the center of the bottom 62. The lower end of the shaft 11 is axially disposed opposite the upper surface of the recess 621. This can lengthen the shaft 11 while suppressing the axial length of the motor 1 from becoming longer. Therefore, for example, a cup-shaped disk (not shown) for reading the encoder signal can be fixed to the lower end portion of the shaft 11. Other members may be fixed to the shaft 11, or may not be fixed.

The conductive member 70 is disposed radially outward of the first casing 50. The conductive member 70 is preferably a plastically deformable member. In the present embodiment, the conductive member 70 is a conductive tape.

The conductive member 70 has a first region 71, a second region 72, and a third region 73. The first region 71 is a region extending in the axial direction. The second region 72 is a portion extending in the axial direction and is disposed below the first region 71. The lower end of the first region 71 and the upper end of the second region 72 are connected by a portion extending from the lower end of the first region 71 in a direction approaching the center axis J. The third region 73 is a portion extending from the lower end of the second region 72 in a direction away from the central axis J. The radially outer end of the third region 73 is disposed radially outward of the radially outer end of the first region 71.

The first region 71 is in contact with the first housing 50. That is, the radially inner surface of the first region 71 is radially in contact with the radially outer surface of the outer cylindrical portion 53. Thereby, the conductive member 70 is electrically connected to the first housing 50. The upper end of the first region 71 is disposed below the ceiling portion 52. That is, the upper end 711 of the conductive member 70 is disposed below the upper end 521 of the first housing 50. This can prevent the conductive member 70 from interfering with other members. That is, the upper end 711 of the conductive member 70 can be prevented from interfering with other members above the top portion 52. This can prevent the conductive member 70 from peeling off from the first casing 50.

The radially inner side of the second region 72 is in radial contact with the radially outer side 221 of the insulator 22. That is, the conductive member 70 radially contacts the radially outer surface 221 of the insulator 22. Thereby, the second region 72 and the insulator 22 can be fixed. Therefore, the conductive member 70 can be prevented from interfering with other members.

The lower surface of the third region 73 is in contact with the upper surface of the base plate 40 in the axial direction. That is, the conductive member 70 is electrically connected to the upper surface of the substrate 40. Thereby, the conductive member 70 is electrically connected to the substrate 40.

According to the above configuration, the substrate 40 and the radially outer surface of the first housing 50 are electrically connected by the deformable conductive member 70. This allows the substrate 40 and the first housing 50 to be electrically connected without applying a large load to the substrate 40. That is, compared to the case where the substrate 40 and the first housing 50 are connected by a rigid body or a member having elasticity, in the case where the substrate 40 and the first housing 50 are electrically connected, stress acting on the substrate 40 and the first housing 50 can be suppressed. In addition, in the present embodiment, since the conductive member 70 is plastically deformable, the work of bringing the conductive member 70 into contact with and fixing the substrate 40 and the first housing 50 is easy.

The radially outer lower surface of the third region 73 axially contacts the upper surface of the substrate 40 radially outward of the outer cylindrical portion 53. That is, the substrate 40 and the conductive member 70 are electrically connected at a position radially outward of the first casing 50. This allows the conductive member 70 to be electrically connected to the substrate 40 in a region where the substrate 40 protrudes radially outward from the first case 50. Therefore, the assembly property in the step of bringing the conductive member 70 into contact with and fixing the substrate 40 is improved.

In the present embodiment, the third region 73 and the connector 41 are vertically overlapped with each other via the substrate 40. That is, the position in the circumferential direction of at least a part of the third region 73 is the same as the position in the circumferential direction of the connector 41. This enables the motor 1 to be reduced in size in the radial direction. That is, by the above configuration, the region disposed radially outward of the radially outer surface of the first housing 50 can be made narrower than in the case where the circumferential position of the third region 73 and the circumferential position of the connector 41 are different.

Fig. 4 is a perspective view of the electronic device 2 according to the exemplary embodiment of the present invention. In the present embodiment, the electronic device 2 is a printer. The electronic device may be a device other than a printer such as a robot or a fan.

The electronic apparatus 2 has a motor 1. An upper tray T1 for placing the printing paper P is disposed on the upper portion of the housing of the electronic device 2. The printing paper P is placed on the upper tray T1, and the printing paper P is introduced into the electronic device 2 by the rotation of the motor 1, and is printed by the electronic device 2. The printed printing paper P is guided to the lower tray T2.

Since the electronic device 2 includes the motor 1, the substrate 40 and the first housing 50 can be electrically connected to each other without applying a large load to the substrate 40 in the motor 1 mounted on the electronic device 2. Therefore, for example, by electrically connecting the first housing 50 to the ground of the electronic device 2, static electricity generated on the substrate 40 can be grounded via the ground of the electronic device 2.

Various technical features disclosed in the present specification can be variously modified without departing from the gist of technical innovation thereof. The embodiments and modifications described in the present specification can be combined and implemented within a possible range.

The utility model discloses can be used for example electronic equipment such as compounding machine.

(symbol description)

J center axis

P printing paper

R region

1. Motor with a stator having a stator core

2. Electronic device

10. Rotor

11. Shaft

12. Magnet body

13. Rotor holder

131. Inner tube part

132. Bottom part

133. Outer tube part

20. Stator

21. Stator core

211. Iron core back

212. Pole tooth

22. Insulator body

221. Radial outer side surface

222. Protrusion

23. Coil

30. Bearing assembly

40. Substrate

41. Connector with a locking member

42. Lead wire

50. First shell

51. Inner tube part

52. Top part

521. Upper end of

53. Outer cylinder part

60. Second housing

61. Cylinder part

611. Locking part

612. Incision

62. Bottom part

621. Concave part

70. Conductive member

71. First region

711. Upper end of

72. Second region

73. And a third region.

Claims (8)

1. A motor, comprising:

a rotor including a shaft disposed along a central axis extending vertically and a magnet fixed to the shaft;

a stator having a coil disposed diametrically opposite the magnet;

a substrate electrically connected to the coil; and

a first metal housing that houses at least a part of the rotor and the stator,

the substrate and the radially outer surface of the first housing are electrically connected by a deformable conductive member.

2. The motor of claim 1,

at least a part of the substrate is arranged at a position radially outward of the first housing,

the substrate and the conductive member are electrically connected to each other at a position radially outward of the first housing.

3. The motor of claim 1,

the first case is disposed above the substrate, and the conductive member is electrically connected to an upper surface of the substrate,

the upper end of the conductive member is disposed below the upper end of the first housing.

4. The motor of any one of claims 1 to 3,

the stator has:

the stator core is provided with a core back and pole teeth, the core back surrounds the central axis and is annular, and the pole teeth extend from the core back to the direction close to the central axis;

an insulator covering at least a portion of the teeth; and

the coil formed by winding a lead wire around the insulator,

at least a portion of the insulator is in contact with an upper surface of the substrate in an axial direction.

5. The motor of claim 4,

the conductive member is in contact with a radially outer surface of the insulator in a radial direction.

6. The motor of any one of claims 1 to 3,

the lead wire is drawn out to a position outside the first case.

7. The motor of any one of claims 1 to 3,

a second housing made of resin, disposed below the substrate, and accommodating at least a part of the rotor and the stator,

the lower surface of the substrate is in contact with the second housing.

8. An electronic device, characterized in that it comprises a display,

having a motor as claimed in any one of claims 1 to 7.

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