Motor

Abstract

To provide a motor which enables reduction of a possibility that a lead wire is damaged.SOLUTION: A motor 1 includes: a rotor 10 having a shaft 11; a stationary part 30 which has a stator 32 located at a radial outer side of a bearing 20; and a lead wire 40 which is electrically connected to the stator 32. The stationary part 30 has: a housing 31 which is located at the radial outer side of the bearing 20 and at the radial inner side of the stator 32, supports the bearing 20, and supports the stator 32; a base part 34 which is located below the stator 32 in an axial direction and to which the housing 31 is fixed; and a fixture member 35 which is fixed to the base part 34. The fixture member 35 has a cover part 351 which is located covering a shaft lower end part located at an axial lower end of the shaft 11 when viewed from below in the axial direction. The cover part 351 has an opening 351a which is open in the axial direction. When viewed from below in the axial direction, the opening 351a is located at the radial inner side relative to an inner peripheral surface of the shaft 11.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a motor. [Background technology]

[0002] A conventional motor is disclosed, for example, in Patent Document 1. In this motor, lead wires are drawn out from a fixed element, which is a stator. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Publication No. 6-6693 Summary of the Invention [Problem to be solved by the invention]

[0004] If the lead wires electrically connected to the stator come into contact with the rotating shaft, there is a risk that the lead wires will be damaged.

[0005] In view of the above, an object of the present invention is to provide a motor that can reduce the risk of damaging the lead wires. [Means for solving the problem]

[0006] An exemplary motor of the present invention comprises a rotor having a cylindrical shaft rotating around a central axis extending in an up-down direction, a bearing located radially outward of the shaft and rotatably supporting the shaft, a stationary part having a stator located radially outward of the bearing, and lead wires electrically connected to the stator, the stationary part having a housing located radially outward of the bearing and radially inward of the stator, supporting the bearing and supporting the stator, a base part located axially below the stator and to which the housing is fixed, and a fixing member fixed to the base part, the fixing member having a cover part located to cover a lower end of the shaft located at the axial lower end of the shaft when viewed from below in the axial direction, the cover part having an opening that opens in the axial direction, the opening being located radially inward of the inner circumferential surface of the shaft when viewed from below in the axial direction. Effect of the Invention

[0007] According to the above configuration, the risk of the lead wire being damaged can be reduced. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view showing a schematic configuration of a motor according to an exemplary embodiment of the present invention. [Diagram 2] FIG. 2 is a bottom view of the motor. [Diagram 3] FIG. 3 is a perspective view showing the appearance of a fixing member of the motor. [Figure 4] FIG. 4 is a cross-sectional view showing a schematic configuration of an electric device having a motor. [Diagram 5] FIG. 5 is a bottom view of the fixing member. [Figure 6] FIG. 6 is a cross-sectional view showing another configuration of the motor. [Figure 7] FIG. 7 is a cross-sectional view showing still another configuration of the motor. [Figure 8] FIG. 8 is a cross-sectional view showing still another configuration of the motor. [Figure 9]FIG. 9 is a cross-sectional view showing still another configuration of the motor. [Figure 10] FIG. 10 is a perspective view of a fixing member of the motor of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. For ease of explanation, the axis around which the motor shaft rotates will be referred to as the "central axis". The direction in which the central axis extends will be referred to as the "axial direction". In this specification, the shape and positional relationship of each part will be described with the axial direction being the up-down direction. However, this definition of the up-down direction does not limit the orientation and positional relationship of the motor when in use.

[0010] In this specification, one side in the axial direction is referred to as "upper" and the other side in the axial direction is referred to as "lower". Therefore, "upper" means upper in the axial direction, and "lower" means lower in the axial direction. In the drawings, the upper axial direction is indicated by the symbol +Z, and the lower axial direction is indicated by the symbol -Z, as appropriate. In addition, in the axial direction, the upper end of a member is called the "upper axial end" or simply the "upper end", and the lower end of a member is called the "lower axial end" or simply the "lower end". Furthermore, in a member, the surface facing upward is called the "upper surface", and the surface facing downward is called the "lower surface".

[0011] In this specification, the direction perpendicular to the central axis and starting from the central axis is called the "radial direction." In addition, the direction approaching the central axis in the radial direction is called the "radial inward direction," and the direction away from the central axis is called the "radial outward direction." In addition, the direction along the arc drawn around the central axis is called the "circumferential direction."

[0012] [1. Motor Overview] Fig. 1 is a cross-sectional view showing a schematic configuration of a motor 1 according to an exemplary embodiment of the present invention. Fig. 2 is a bottom view of the motor 1. The motor 1 is an outer rotor type motor. The motor 1 has a rotor 10, a bearing 20, a stationary part 30, and lead wires 40.

[0013] (1-1. Rotor) The rotor 10 includes a shaft 11, a magnet 12, a rotor yoke 13, a cover portion 14, and a flange portion 15.

[0014] The shaft 11 rotates about a central axis CA extending in the vertical direction. The shaft 11 is made of a cylindrical member made of a metal such as stainless steel. That is, the motor 1 includes a rotor 10 having a cylindrical shaft 11 that rotates about a central axis CA extending in the vertical direction.

[0015] The cylindrical shaft 11 is also called a hollow shaft. The shaft 11 has an inner circumferential surface 11a. The inner circumferential surface 11a is the surface of the shaft 11 that is located radially inward and circumferentially surrounds the central axis CA.

[0016] The shaft 11 has a shaft upper end portion 111 and a shaft lower end portion 112. The shaft upper end portion 111 is located at the upper end of the shaft 11. That is, the shaft 11 has the shaft upper end portion 111 at an upper end in the axial direction. The shaft lower end portion 112 is located at a lower end of the shaft 11. That is, the shaft 11 has the shaft lower end portion 112 at a lower end in the axial direction.

[0017] The magnet 12 is located radially outward of a stator 32 described later and circumferentially surrounds the central axis CA. The magnet 12 may be configured in the shape of a single ring. Alternatively, a plurality of magnets 12 may be arranged in the circumferential direction.

[0018] The rotor yoke 13 is positioned radially outward of the magnet 12 and supports the magnet 12. The rotor yoke 13 is formed in a shape that circumferentially surrounds the central axis CA. The magnet 12 and the rotor yoke 13 are supported by a lid portion .

[0019] The lid portion 14 is made of, for example, metal. The lid portion 14 may be made of resin. The lid portion 14 covers a housing 31 and a stator 32 of the stationary portion 30 from above, which will be described later.

[0020] The flange 15 is located radially outward of the lid 14 and is fixed to the lid 14. The flange 15 is made of, for example, metal. The flange 15 may be made of resin. A rotating object OB, for example, as shown in FIG. 4, is attached to the flange 15. Details of the rotating object OB will be described later.

[0021] The cover portion 14 has a through hole 14P that penetrates in the axial direction. The shaft 11 is press-fitted into the through hole 14P of the cover portion 14. This allows the shaft 11, the magnet 12, the rotor yoke 13, the cover portion 14, and the flange portion 15 to rotate integrally about the central axis CA.

[0022] (1-2. Rotating Part) The bearing 20 is located radially outward of the shaft 11. The bearing 20 supports the shaft 11 rotatably about a central axis CA. That is, the motor 1 includes the bearing 20, which is located radially outward of the shaft 11 and supports the shaft 11 rotatably.

[0023] The bearing 20 is, for example, a ball bearing. The bearing 20 may be a sleeve bearing. In this embodiment, two bearings 20 are arranged spaced apart in the axial direction, but the number of bearings 20 is not particularly limited.

[0024] (1-3.Stationary part) The stationary portion 30 includes a housing 31 , a stator 32 , a circuit board 33 , a base portion 34 , and a fixing member 35 .

[0025] The housing 31 is formed in a cylindrical shape surrounding the central axis CA in the circumferential direction. The housing 31 is made of, for example, metal, but may be made of resin. The housing 31 is located radially outward of the bearing 20 and radially inward of the stator 32. The housing 31 supports the bearing 20 on the radially inner side and supports the stator 32 on the radially outer side. In other words, the stationary part 30 has the housing 31 located radially outward of the bearing 20 and radially inward of the stator 32, supporting the bearing 20 and supporting the stator 32.

[0026] The stator 32 is located radially outward of the bearing 20 and radially inward of the magnets 12 of the rotor 10. That is, the stationary portion 30 has the stator 32 located radially outward of the bearing 20. The stator 32 has a stator core 321, an insulator 322, and a coil 323.

[0027] Stator core 321 is formed by stacking electromagnetic steel plates, such as silicon steel plates, one above the other. Insulator 322 is formed of an insulating resin. Insulator 322 is provided to surround the outer surface of stator core 321. Coil 323 is formed of a conductor wound around stator core 321 via insulator 322. Coil 323 is electrically connected to circuit board 33. Thus, a drive current is supplied to coil 323 from circuit board 33.

[0028] The circuit board 33 is attached to the insulator 322. A DC jack (not shown) is provided on the circuit board 33. A cable (not shown) is connected to the DC jack. Thus, DC power is supplied to the circuit board 33 via the cable.

[0029] As shown in Fig. 2, a connector 33a and electronic components 33b are provided on the lower surface of the circuit board 33. The lead wire 40 shown in Fig. 1 is electrically connected to the circuit board 33 via the connector 33a. As described above, the circuit board 33 is electrically connected to the coil 323 of the stator 32. Therefore, the lead wire 40 is electrically connected to the stator 32 via the circuit board 33. That is, the motor 1 includes the lead wire 40 electrically connected to the stator 32. The lead wire 40 is formed by bundling a plurality of cables.

[0030] The electronic component 33b is, for example, a temperature sensor such as a thermistor. Although not shown, the circuit board 33 also has other electronic components such as a Hall element and a photosensor.

[0031] The base portion 34 is located below the stator 32. The base portion 34 is formed in an annular shape in the circumferential direction. The housing 31 is fixed to an upper surface of the base portion 34. That is, the stationary portion 30 is located axially below the stator 32 and has the base portion 34 to which the housing 31 is fixed.

[0032] In this embodiment, the base portion 34 is made of, for example, a metal, and is formed integrally with the housing 31. Note that, for example, the housing 31 may be formed of a resin, and the base portion 34 may be formed of a metal. In this case, the housing 31 and the base portion 34 are connected by a method such as bonding with an adhesive or press-fitting.

[0033] As shown in FIG. 2, the base portion 34 has a lead wire insertion portion 34a and an electronic component exposed portion 34b. The lead wire insertion portion 34a and the electronic component exposed portion 34b are positioned in a circumferentially offset manner in the base portion 34. The lead wire insertion portion 34a is configured as a notch recessed from the radially outer side of the base portion 34 toward the radially inner side. The lead wire insertion portion 34a may be a hole penetrating the base portion 34 in the axial direction. The lead wire 40 connected to the connector 33a of the circuit board 33 is drawn downward through the lead wire insertion portion 34a. This prevents interference between the lead wire 40 and the base portion 34.

[0034] A lead wire 40 is drawn downward from the circuit board 33 through the lead wire insertion portion 34a, and is electrically connected to a rotating object OB that swings and moves, as shown in FIG.

[0035] Like the lead wire insertion portion 34a, the electronic component exposed portion 34b is also configured as a notch recessed from the radially outer side toward the radially inner side of the base portion 34. The electronic component exposed portion 34b may be a hole penetrating the base portion 34 in the axial direction. The electronic component 33b provided on the lower surface of the circuit board 33 is exposed downward through the electronic component exposed portion 34b. This makes it possible to hold the electronic component 33b on the circuit board 33 while preventing interference with the base portion 34, even if the electronic component 33b is high in the axial direction.

[0036] In the above configuration, when a driving current is supplied to coil 323, a radial magnetic flux is generated in stator core 321. A magnetic field generated by the magnetic flux of stator core 321 and a magnetic field generated by magnet 12 interact with each other, generating a torque in the circumferential direction of rotor 10. This torque causes rotor 10, including shaft 11, to rotate about central axis CA.

[0037] [2. About fixing parts] Next, the fixing member 35 of the stationary part 30 will be described with reference to Figs. 1 to 3. Fig. 3 is a perspective view showing the appearance of the fixing member 35. The fixing member 35 is fixed to the base part 34 of the stationary part 30 from below. That is, the stationary part 30 has the fixing member 35 fixed to the base part 34. The fixing member 35 is fixed to the base part 34 by, for example, press-fitting, but may be fixed by other methods such as adhesion or screwing. The fixing member 35 is made of, for example, resin, but may also be made of metal.

[0038] The fixing member 35 has a cover portion 351. When viewed from below, the cover portion 351 is located so as to cover the shaft lower end portion 112 of the shaft 11. That is, when viewed from below in the axial direction, the fixing member 35 has the cover portion 351 located so as to cover the shaft lower end portion 112 located at the axial lower end of the shaft 11.

[0039] The cover portion 351 has an opening 351a. The opening 351a is provided by opening the cover portion 351 in the direction of the central axis CA. That is, the cover portion 351 has the opening 351a that opens in the axial direction. When the cover portion 351 is viewed from below, as shown in FIG. 2, the shape of the opening 351a of the cover portion 351 is circular. In other words, the shape of the edge 351E that defines the outer shape of the opening 351a is circular. Note that the shape of the opening 351a is not limited to a circle, and may be a polygonal shape such as a rectangle.

[0040] The opening 351a of the cover portion 351 is located radially inward from the inner circumferential surface 11a of the shaft 11 when viewed from below. In other words, the opening 351a is located radially inward from the inner circumferential surface 11a of the shaft 11 when viewed from below in the axial direction.

[0041] As shown in Figs. 1 and 3, the fixing member 35 further has a cylindrical portion 352. The cylindrical portion 352 has a cylindrical upper end portion 352a and a cylindrical lower end portion 352b. The cylindrical upper end portion 352a is located at the upper end of the cylindrical portion 352. That is, the cylindrical portion 352 has the cylindrical upper end portion 352a at the upper end in the axial direction. The cylindrical lower end portion 352b is located at the lower end of the cylindrical portion 352. That is, the cylindrical portion 352 has the cylindrical lower end portion 352b at the lower end in the axial direction.

[0042] The cylindrical portion 352 is located above the cover portion 351. A lower end portion 352b of the cylindrical portion is fixed to the cover portion 351. The inside of the cylindrical portion 352 is connected to an opening portion 351a of the cover portion 351. That is, the fixing member 35 has the cylindrical portion 352 that is fixed to the cover portion 351 and whose inside is connected to the opening portion 351a. Note that the cover portion 351 and the cylindrical portion 352 may be formed integrally.

[0043] The cylindrical portion 352 is located so as to extend upward inside the shaft 11 from the radially inner end of the cover portion 351. That is, the cylindrical portion 352 is located so as to extend axially upward inside the shaft 11 from the cover portion 351. In the motor 1 shown in FIG. 1, the cylindrical portion upper end portion 352a is located higher than the shaft upper end portion 111. That is, the upper end of the cylindrical portion 352 is located higher in the axial direction than the upper end of the shaft 11.

[0044] 1 and 2, inside the shaft 11, the tubular portion 352 is located radially inward from the inner circumferential surface 11a of the shaft 11 by a gap T. That is, the tubular portion 352 is located inside the shaft 11 with the gap T interposed between it and the inner circumferential surface 11a of the shaft 11.

[0045] 4 is a cross-sectional view showing a schematic configuration of an electric device 500 having the motor 1 configured as above. The electric device 500 includes a rotating object OB in addition to the motor 1. The rotating object OB is an object that is rotated by the motor 1. Examples of the rotating object OB include a speaker, a circulator, a tablet, a television, and a mirror. Note that the rotating object OB is not limited to these examples.

[0046] The rotating object OB is attached to a flange portion 15 of a rotor 10 of the motor 1. The rotating object OB can be attached to the flange portion 15 by various methods such as adhesion or screw fastening.

[0047] The lead wire 40 described above is electrically connected to the rotating object OB attached to the rotor 10. That is, one end of the lead wire 40 is electrically connected to the circuit board 33, and the other end is electrically connected to the rotating object OB. This allows various information to be output from the circuit board 33 to the rotating object OB via the lead wire 40. Examples of the information include rotational position information of the rotor 10 detected by a hall element and a photosensor of the circuit board 33, and temperature information detected by a thermistor. In addition, power can be supplied from the circuit board 33 to the rotating object OB via the lead wire 40.

[0048] The lead wire 40 is positioned through the inside of the cylindrical shaft 11. As a result, even if the circuit board 33 and the rotating object OB are positioned on opposite sides of the stator 32 in the axial direction as shown in Fig. 4, the lead wire 40 can electrically connect the circuit board 33 and the rotating object OB without exposing the lead wire 40 radially outward from the motor 1. This makes it possible to reduce the situation in which the appearance quality is impaired due to the lead wire 40 being exposed radially outward from the motor 1.

[0049] When the rotor 10 rotates about the central axis CA, the rotating object OB fixed to the rotor 10 also rotates about the central axis CA. Here, the reference position when the rotor 10 rotates in the circumferential direction is defined as a position with a rotation angle of 0 degrees. The maximum angle that the rotor 10 can rotate in one circumferential direction from the reference position is defined as +A°. The maximum angle that the rotor 10 can rotate in the opposite circumferential direction from the reference position is defined as -A°. The value of A is an angle less than 180° in absolute value, but can be set appropriately.

[0050] The rotor 10 is rotated from the reference position in one circumferential direction to a position of +A°, and then rotated in the opposite circumferential direction to a position of -A°. By repeatedly switching the rotation direction in this manner, the rotating object OB fixed to the rotor 10 can be swiveled through an angle of ±A° in the circumferential direction. The circumferential rotation speed of the rotor 10 can be appropriately set by adjusting the magnitude of the drive current flowing through the coil 323.

[0051] In this embodiment, the stationary portion 30 of the motor 1 has the above-mentioned fixed member 35. This makes it possible to adopt a layout in which the lead wires 40 pass through the inside of the cylindrical shaft 11 through an opening 351a of a cover portion 351 of the fixed member 35, as shown in FIG.

[0052] At this time, the cover portion 351 is fixed to the base portion 34 of the stationary portion 30. Therefore, the fixing member 35 is in a stationary state. Furthermore, the lead wire 40 is electrically connected to the stator 32 of the stationary portion 30, that is, the stator 32 in a stationary state. Therefore, even if the lead wire 40 comes into contact with an edge 351E of the opening 351a of the cover portion 351 when passing through the inside of the cylindrical shaft 11, the lead wire 40 can be prevented from rubbing against the edge 351E.

[0053] Also, the opening 351a of the cover portion 351 is located radially inward of the inner circumferential surface 11a of the shaft 11. Therefore, as shown in Fig. 4, when the lead wire 40 passes from bottom to top inside the shaft 11, an edge 351E of the opening 351a of the cover portion 351 is located between the shaft lower end portion 112 and the lead wire 40. Therefore, even when the shaft 11 rotates due to the rotation of the rotor 10, the lead wire 40 is prevented from directly contacting the shaft lower end portion 112.

[0054] In this way, even when a layout is adopted in which the lead wire 40 passes through the inside of the shaft 11 through the opening 351a of the cover portion 351, (1) it is possible to prevent the lead wire 40 from rubbing against the edge 351E of the opening 351a. In addition, (2) even when the shaft 11 rotates, the lead wire 40 is prevented from directly contacting the shaft lower end portion 112. For these two reasons, it is possible to reduce the risk of the lead wire 40 being damaged.

[0055] Moreover, the cylindrical portion 352 of the fixing member 35 is positioned so as to extend upward from the cover portion 351 inside the shaft 11. In this configuration, when the lead wire 40 passes through the inside of the shaft 11, the cylindrical portion 352 is positioned between the inner circumferential surface 11a of the shaft 11 and the lead wire 40. This prevents the lead wire 40 from coming into direct contact with the inner circumferential surface 11a of the shaft 11 even when the shaft 11 rotates. As a result, it is possible to reduce the risk of the lead wire 40 being damaged by contact with the inner circumferential surface 11a of the rotating shaft 11.

[0056] Furthermore, in the radial direction, a gap T exists between the tubular portion 352 and the inner circumferential surface 11a of the shaft 11. As a result, even when the shaft 11 rotates, the tubular portion 352 is not in contact with the shaft 11. This reduces the risk of the tubular portion 352 coming into contact with the rotating shaft 11 and being damaged.

[0057] Also, the upper end of the tubular portion 352 is located above the upper end of the shaft 11. In this configuration, as shown in FIG. 4, when a layout is adopted in which the lead wire 40 passes from bottom to top inside the shaft 11, exits the shaft upper end 111, and bends radially outward, the tubular portion upper end 352a is located between the shaft upper end 111 and the lead wire 40. This prevents the lead wire 40 from coming into direct contact with the shaft upper end 111 when the shaft 11 rotates. This reduces the risk of the lead wire 40 being damaged by contact with the rotating shaft upper end 111.

[0058] 5 is a bottom view of the fixing member 35. The area of ​​the opening 351a when the cover portion 351 is viewed from below is defined as S1 (mm 2 ) and the cross-sectional area of ​​the lead wire 40 is S2 (mm 2 In this embodiment, S1>S2. That is, the area of ​​the opening 351a of the cover portion 351 is larger than the cross-sectional area of ​​the lead wire 40.

[0059] Such a relationship between S1 and S2 enables the lead wire 40 to pass through the opening 351a. That is, it is possible to realize a layout of the motor 1 in which the lead wire 40 passes through the opening 351a of the cover portion 351 as shown in FIG.

[0060] In the configuration of FIG. 4, a portion of the lead wire 40 is located inside the opening 351 a of the cover portion 351 and the shaft 11 .

[0061] In a configuration in which the lead wire 40 is located inside the opening 351a of the cover part 351 and the shaft 11, the edge 351E of the opening 351a of the cover part 351 is located between at least the shaft lower end part 112 and the lead wire 40. This prevents the lead wire 40 from directly contacting at least the shaft lower end part 112. Therefore, even if the shaft 11 rotates, the risk of the lead wire 40 being damaged can be reduced.

[0062] In particular, in a configuration in which a portion of the lead wire 40 is located inside the opening 351a and the cylindrical portion 352, the cylindrical portion 352 exists between the inner circumferential surface 11a of the shaft 11 and the lead wire 40. The existence of the cylindrical portion 352 prevents the lead wire 40 from coming into direct contact with the inner circumferential surface 11a of the shaft 11. Therefore, even when the shaft 11 rotates, the risk of the lead wire 40 being damaged by contact with the inner circumferential surface 11a of the shaft 11 can be reduced.

[0063] As shown in FIG. 4, an electric device 500 of this embodiment includes the motor 1 described above and a rotating object OB fixed to the rotor 10 of the motor 1.

[0064] In this configuration, in the electric device 500, a layout can be realized in which the lead wire 40 passes through the opening 351a of the fixed member 35 and the inside of the shaft 11 and is electrically connected to the rotating object OB. In such a layout of the electric device 500, the edge 351E of the opening 351a of the cover part 351 is located between at least the shaft lower end part 112 and the lead wire 40. This prevents the lead wire 40 from directly contacting at least the shaft lower end part 112. Therefore, in the electric device 500, even if the shaft 11 of the motor 1 rotates and the rotating object OB rotates in the circumferential direction in response to the rotation of the shaft 11, the risk of the lead wire 40 being damaged can be reduced.

[0065] 4, in the electric device 500, the rotating object OB is electrically connected to the lead wire 40 disposed inside the shaft 11 of the motor 1. In this manner, in the configuration of the electric device 500 in which the rotating object OB is electrically connected to the lead wire 40, it is possible to reduce the risk of the lead wire 40 coming into contact with the rotating shaft 11 and being damaged.

[0066] [3. Other motor configurations] Fig. 6 is a cross-sectional view showing another configuration of the motor 1. The fixing member 35 applied to the motor 1 may have the configuration shown in Fig. 6. In the configuration shown in Fig. 6, the cylindrical portion upper end 352a of the fixing member 35 is at the same axial position as the shaft upper end 111. In other words, the upper end of the cylindrical portion 352 is at the same axial position as the upper end of the shaft 11.

[0067] 6, the cylindrical portion upper end 352a can be positioned between the shaft upper end 111 and the lead wire 40 passing through the inside of the shaft 11, thereby preventing the lead wire 40 from directly contacting the shaft upper end 111. This can reduce the risk of the lead wire 40 being damaged by contact with the rotating shaft upper end 111.

[0068] Fig. 7 is a cross-sectional view showing still another configuration of the motor 1. The fixing member 35 applied to the motor 1 may have the configuration shown in Fig. 7. In the configuration shown in Fig. 7, the cylindrical portion upper end portion 352a of the fixing member 35 is located lower than the shaft upper end portion 111. In other words, the upper end of the cylindrical portion 352 is located axially lower than the upper end of the shaft 11.

[0069] When a layout is adopted in which the lead wire 40 passes through the inside of the shaft 11 from bottom to top, the cylindrical portion 352 is located between a part of the inner circumferential surface 11a of the shaft 11 and the lead wire 40. This prevents the lead wire 40 from directly contacting the inner circumferential surface 11a of the shaft 11 when the shaft 11 rotates. This reduces the risk of the lead wire 40 being damaged by contact with the inner circumferential surface 11a of the rotating shaft 11.

[0070] 8 is a cross-sectional view showing still another configuration of the motor 1. The fixing member 35 applied to the motor 1 may have the configuration shown in FIG. 8. In the configuration shown in FIG. 8, the fixing member 35 has an inclined portion 353. The inclined portion 353 is fixed to the upper end of the cylindrical portion 352. In other words, the fixing member 35 has an inclined portion 353 that is connected to the upper end of the cylindrical portion 352.

[0071] The inclined portion 353 has an inclined upper end 353a and an inclined lower end 353b. The inclined upper end 353a is located at the upper end of the inclined portion 353. That is, the inclined portion 353 has the inclined upper end 353a at the axial upper end. The inclined lower end 353b is located at the lower end of the inclined portion 353. That is, the inclined portion 353 has the inclined lower end 353b at the axial lower end. The inclined lower end 353b is fixed to the cylindrical portion upper end 352a. This connects the inclined portion 353 to the upper end of the cylindrical portion 352. The inclined portion 353 may be formed integrally with the cylindrical portion 352.

[0072] The inclined portion 353 is formed in a tapered shape in which the opening diameter becomes smaller from the bottom to the top. That is, the inclined portion 353 is inclined in a direction approaching the central axis CA from the axially lower side to the axially upper side. The inclined upper end portion 353a opens in the axial direction. That is, the upper end of the inclined portion 353 opens in the axial direction.

[0073] In the configuration of Fig. 8, when the lead wire 40 travels from the bottom to the top inside the cylindrical portion 352 and passes through the opening of the inclined upper end portion 353a, the lead wire 40 is guided by the inclined portion 353 in a direction approaching the central axis CA. This increases the distance between the lead wire 40 that has passed through the opening of the inclined upper end portion 353a and the inner circumferential surface 11a of the shaft 11. As a result, the lead wire 40 is less likely to come into contact with the shaft upper end portion 111. This reduces the risk of the lead wire 40 coming into contact with the shaft upper end portion 111 and being damaged.

[0074] Fig. 9 is a cross-sectional view showing still another configuration of the motor 1. Fig. 10 is a perspective view of the fixing member 35 of Fig. 9. The fixing member 35 applied to the motor 1 may be composed of only the above-mentioned cover part 351. In this case, the fixing member 35 is located outside the shaft 11. In other words, the fixing member 35 is not present inside the shaft 11.

[0075] Even if the fixing member 35 is configured to be located outside the shaft 11, that is, even if the fixing member 35 is configured only by the cover portion 351, when the lead wire 40 passes through the inside of the shaft 11, the edge 351E of the opening 351a of the cover portion 351 is located between the shaft lower end portion 112 and the lead wire 40. This prevents the lead wire 40 from directly contacting the shaft lower end portion 112 when the shaft 11 rotates. This reduces the risk of the lead wire 40 being damaged by contact with the rotating shaft 11.

[0076] [4. Other] In the present embodiment, the configuration has been described in which the fixed member 35, that is, the member for preventing contact between the lead wire 40 and the shaft 11, is provided in the motor 1. However, the member may be provided in the rotating object OB. For example, the member is configured to be cylindrical and fixed to the rotating object OB. The member is then extended downward from the rotating object OB and positioned inside the shaft 11. The lead wire 40 electrically connected to the stator 32 is passed from below to inside the member and electrically connected to the rotating object OB located above the member, thereby reducing the risk of the lead wire 40 coming into contact with the shaft 11 and reducing the risk of the lead wire 40 being damaged.

[0077] Although the embodiment of the present invention has been described above, the scope of the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. Furthermore, the above embodiment and its modifications can be combined in any suitable manner. [Industrial Applicability]

[0078] The motor of the present invention can be used, for example, in an electric device that causes a rotating object to oscillate. [Explanation of symbols]

[0079] 1 Motor 10 Rotor 11 Shaft 11a Inner surface 20 Bearings 30 Stationary part 31 Housing 32 Stator 34 Base 35 Fixing member 351 Cover part 351a opening 351E Edge 352 Cylinder part 353 Slope 40 Lead Wire 500 Electrical Equipment CA center axis OB Rotating object T gap

Claims

1. a rotor having a cylindrical shaft that rotates around a central axis extending in the vertical direction; a bearing located radially outward of the shaft and rotatably supporting the shaft; a stationary portion having a stator positioned radially outward of the bearing; a lead wire electrically connected to the stator via a circuit board; The stationary portion is a housing positioned radially outward of the bearing and radially inward of the stator, the housing supporting the bearing and the stator; a base portion located axially below the stator and to which the housing is fixed; a fixing member fixed to the base portion, the fixing member has a cover portion located to cover a lower end portion of the shaft located at a lower end of the shaft in the axial direction when viewed from below in the axial direction, The cover portion has an opening portion that opens in the axial direction, When viewed from below in the axial direction, the opening is located radially inward of an inner circumferential surface of the shaft, The base portion has a lead wire insertion portion through which the lead wires extending axially downward from the circuit board pass.

2. A motor as described in claim 1, wherein the lead wire insertion portion has a notch recessed from the radial outside to the radial inside of the base portion, or a hole that penetrates axially through the base portion.

3. A motor as described in claim 1 or 2, wherein the area of ​​the opening of the cover portion is larger than the cross-sectional area of ​​the lead wire.

4. The fixing member further has a tubular portion fixed to the cover portion and connecting the opening portion to an inside thereof, The motor according to claim 1 , wherein the cylindrical portion is positioned so as to extend axially upward from the cover portion inside the shaft.

5. A motor as described in claim 4, wherein the tubular portion is located inside the shaft with a gap between it and the inner surface of the shaft.

6. A motor as described in claim 4 or 5, wherein an upper end of the tubular portion is located axially above an upper end of the shaft.

7. A motor as described in claim 4 or 5, wherein an upper end of the tubular portion is at the same axial position as an upper end of the shaft.

8. A motor as described in claim 4 or 5, wherein an upper end of the tubular portion is located axially lower than an upper end of the shaft.

9. A rotor having a cylindrical shaft that rotates around a central axis extending in the vertical direction; a bearing located radially outward of the shaft and rotatably supporting the shaft; a stationary portion having a stator positioned radially outward of the bearing; a lead wire electrically connected to the stator; The stationary portion is a housing positioned radially outward of the bearing and radially inward of the stator, the housing supporting the bearing and the stator; a base portion located axially below the stator and to which the housing is fixed; a fixing member fixed to the base portion, the fixing member has a cover portion located to cover a lower end portion of the shaft located at a lower end of the shaft in the axial direction when viewed from below in the axial direction, The cover portion has an opening portion that opens in the axial direction, When viewed from below in the axial direction, the opening is located radially inward of an inner circumferential surface of the shaft, the fixing member further includes a tubular portion fixed to the cover portion and having an interior connected to the opening portion, The cylindrical portion is located so as to extend axially upward inside the shaft from the cover portion, an upper end of the cylindrical portion is located axially lower than an upper end of the shaft, the fixing member has an inclined portion connected to an upper end of the cylindrical portion, The inclined portion is inclined in a direction approaching the central axis from the axial lower portion toward the axial upper portion, The upper end of the inclined portion is open in the axial direction.

10. The motor according to claim 1 , wherein the fixed member is located outside the shaft.

11. A motor according to any one of claims 1 to 10; a rotating object fixed to the rotor of the motor.

12. The electric device according to claim 11 , wherein the rotating object is electrically connected to the lead wire disposed inside the shaft of the motor.

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