Motor, fan, and moving body

Abstract

The invention provides a low-height motor, a fan provided with the motor, and a moving body. An electric motor (12) is provided with: a rotor (2) including a rotating shaft (21); a stator (3) disposed outside the rotor (2) when viewed from the rotating shaft (21); a bearing (41) that rotatably supports the rotating shaft (21); and a circuit board (7) on which at least one electronic component (6) is mounted. The rotor (2) further includes a yoke (23) connected to the rotating shaft (21). When viewed from a direction orthogonal to the central axis (A1) of the rotating shaft (21), the yoke (23) overlaps the bearing (41) and overlaps the at least one electronic component (6).

Description

Technical Field

[0001] The present disclosure relates to a motor, a fan, and a moving object, and more particularly to an inner rotor type motor, a fan including the motor, and a moving object including the fan. Background Art

[0002] An inner rotor type electric motor that can be used as a driving source for a fan or the like is conventionally known (see Patent Document 1).

[0003] This motor includes a rotor, a stator, and a bearing. The rotor includes a rotating shaft and a yoke connected to the rotating shaft. The stator is arranged outside the rotor. The bearing supports the rotating shaft so that it can rotate. The motor also includes a circuit board on which electronic components are mounted.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2005-168264 Summary of the invention

[0007] In the above-mentioned electric motor used as a driving source for a fan or the like, it is desired to reduce the height of the entire electric motor.

[0008] An object of the present disclosure is to provide a low-profile electric motor, a fan including the electric motor, and a moving object.

[0009] The electric motor of one embodiment of the present disclosure comprises: a rotor including a rotating shaft; a stator arranged outside the rotor when viewed from the rotating shaft; a bearing supporting the rotating shaft so as to be rotatable; and a circuit board on which at least one electronic component is mounted. The rotor further comprises a yoke connected to the rotating shaft. When viewed in a direction orthogonal to the central axis of the rotating shaft, the yoke is arranged to overlap with the bearing and overlap with the at least one electronic component.

[0010] A fan according to another aspect of the present disclosure includes: the electric motor; and a blade coupled to the rotating shaft of the electric motor.

[0011] A moving object according to another aspect of the present disclosure includes: the above-mentioned blower; and a vehicle body that houses the blower.

[0012] The electric motor, the fan, and the moving object disclosed herein have the effect of enabling the height of the electric motor to be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a top view of a fan according to one embodiment.

[0014] Figure 2 yes Figure 1 Sectional view along line II-II.

[0015] Figure 3 yes Figure 2 An enlarged view of the main part.

[0016] Figure 4 It is a perspective view showing the motor and blades included in the fan separately.

[0017] Figure 5 This is a perspective view of a yoke included in the motor.

[0018] Figure 6 It is a perspective view showing the main parts of the motor in a cutaway manner.

[0019] Figure 7 This is a schematic diagram showing a moving object including the fan. DETAILED DESCRIPTION

[0020] The embodiments and variations described below are merely examples of the present disclosure, and the present disclosure is not limited to the following embodiments and variations. Even in addition to these embodiments and variations, various changes can be made according to design, etc. as long as they do not deviate from the scope of the technical ideas of the present disclosure. In addition, the structures of the variations can also be appropriately combined for application.

[0021] (1) Implementation Method

[0022] The blower fan of one embodiment will be described in detail with reference to the drawings. As described later, the blower fan of one embodiment is suitable for installation in a mobile object such as an automobile, but can also be installed in other equipment such as home appliances.

[0023] (1-1) Overall structure of the fan

[0024] Figure 1 It is a top view of the fan 1 according to one embodiment of the present disclosure. Figure 2 yes Figure 1 The blower 1 is shown in a cross-sectional view taken along line II-II. Figure 3 yes Figure 2 The main part of the fan 1 is enlarged. Figure 2 and Figure 3 In the XZ orthogonal coordinate system, the direction parallel to the central axis A1 is set as the Z direction and the direction perpendicular to the central axis A1 is set as the X direction. The axis of X=0, that is, the Z axis, coincides with the central axis A1. In addition, the positive direction of the Z axis is set as "upward or upward direction", and the negative direction of the Z axis is set as "downward or downward direction". In addition, "upward or upward direction" and "downward or downward direction" are relative, and do not necessarily refer to "upward or upward direction" and "downward or downward direction" in the vertical direction.

[0025] In addition, there are cases where the direction perpendicular to the central axis A1 is referred to as the "radial direction". In addition, when viewed from a certain point, in an area in a direction perpendicular to the central axis A1, an area closer to the central axis A1 than the point is referred to as the "inner", "inner" or "inner peripheral" area. Similarly, when viewed from a certain point, in an area in a direction perpendicular to the central axis A1, an area farther from the central axis A1 than the point is referred to as the "outer", "outer" or "outer peripheral" area.

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, a fan 1 according to one embodiment includes a motor 12 , a housing 14 for blowing air mounted on the motor 12 , and blades 16 rotatably mounted in the housing 14 .

[0027] The fan 1 of one embodiment is a centrifugal fan. The fan 1 is configured to suck air along the central axis A2 of the blades 16 and to move air in a direction intersecting the central axis A2 (in one embodiment, a direction orthogonal to the central axis A2, Figure 2 The center is the X-axis direction) exhaust.

[0028] In one embodiment, the central axis A2 of the blade 16 coincides with the central axis A1 of the rotating shaft 21 of the motor 12 . The direction in which the fan 1 sucks air coincides with the direction in which the motor 12 is located relative to the blade 16 .

[0029] The blade 16 is coupled to a first end portion 211 of the rotating shaft 21 in a direction along the central axis A1. The blade 16 is driven and rotated integrally with the rotating shaft 21 of the motor 12.

[0030] (1-2) Shell

[0031] The housing 14 has an air intake port 144 for taking in external air, an air discharge port 145 for discharging air to the outside space, and a flow path 146 connecting the air intake port 144 and the air discharge port 145 .

[0032] When blades 16 rotate inside casing 14 , air sucked in through air inlet 144 is guided toward discharge port 145 along flow path 146 .

[0033] In one embodiment, the air inlet 144 is circular in shape, and the air outlet 145 is, for example, rectangular in shape.

[0034] The housing 14 includes a first member 141 forming a half of the housing 14 and a second member 142 forming the other half of the housing 14. The housing 14 is formed by fitting the first member 141 and the second member 142 together.

[0035] The air inlet 144 is included in the first member 141. When the first member 141 and the second member 142 are fitted together, the air outlet 145 is formed.

[0036] The flow path 146 forms a vortex body surrounding the periphery of the blade 16. The flow path 146 is formed when the first member 141 and the second member 142 are fitted together.

[0037] The housing 14 further includes an opening 140 for connecting the motor 12 . The opening 140 is included in the second member 142 .

[0038] When the first member 141 and the second member 142 are fitted together, the opening 140 included in the second member 142 is located at a position facing the air intake port 144 included in the first member 141. The opening 140 is a circular opening.

[0039] The central axis A2 of the blade 16 is set to pass through the center of the opening 140. The opening 140 is an opening for inserting the part 121 of the motor 12 into the air-blowing housing 14. The part 121 of the motor 12 is arranged above the lower surface 147 of the air-blowing housing 14, that is, in the positive direction of the Z direction than the lower surface 147.

[0040] (1-3) Leaves

[0041] Figure 4 The diagram is a perspective view showing the motor 12 and the blade 16 of the fan 1 according to the embodiment separated from each other. The blade 16 includes a flat-plate-shaped hub 161 coupled to the rotating shaft 21 and a plurality of blade plates 165 connected to the hub 161 .

[0042] The hub 161 is in the shape of a flat plate and has a pair of flat surfaces 1612 and 1613 facing opposite sides.

[0043] The hub 161 includes a connecting portion 1615 constituting the center portion of the hub 161. The connecting portion 1615 is a cylindrical portion into which the first end portion 211 of the rotating shaft 21 is inserted. By inserting the first end portion 211 of the rotating shaft 21 into the connecting portion 1615 of the blade 16, the rotating shaft 21 and the blade 16 are connected in a manner that allows them to rotate as one.

[0044] The central axis A2 of the blade 16 passes through the central portion (in other words, the connection portion 1615) of the hub 161. The plurality of blade plates 165 protrude toward the outside of the peripheral edge portion 1612a of the flat surface 1612 of the hub 161 when viewed from the central axis A2.

[0045] The plurality of blade plates 165 are arranged at equal intervals in the circumferential direction surrounding the central axis A2 of the blade 16. The plurality of blade plates 165 are provided integrally with the hub 161.

[0046] Each blade plate 165 has an arc-shaped outer shape in a plan view. Each blade plate 165 includes an inner peripheral end 165 a close to the central axis A2 of the blade 16 and an outer peripheral end 165 b away from the central axis A2 of the blade 16 .

[0047] (1-4) Electric motor

[0048] The electric motor 12 is a so-called inner rotor type brushless motor.

[0049] like Figure 1 to Figure 4 As shown, the electric motor 12 includes a rotor 2, a stator 3, two bearings, namely, a first bearing 41 and a second bearing 42, a circuit board 7, and a motor case 8 that accommodates these components.

[0050] (1-4-1) Rotor

[0051] The rotor 2 includes a yoke 23 on which at least one magnet 25 is arranged, in addition to a rotating shaft 21 .

[0052] Figure 5 2 is a perspective view of a yoke 23 provided in the motor 12. Figure 2 , Figure 5 As shown, the yoke 23 has a through hole 237 through which the rotating shaft 21 passes. The through hole 237 is provided at the center of the yoke 23 .

[0053] By passing the rotating shaft 21 through the through hole 237 , the yoke 23 and the rotating shaft 21 are coupled to each other so as to be rotatable as one.

[0054] The yoke 23 has two surfaces, namely, a first surface 231 and a second surface 232 , which face opposite to each other in the Z direction, which is the direction in which the through hole 237 penetrates.

[0055] The first surface 231 faces the circuit board 7 . The second surface 232 faces the first bearing 41 .

[0056] The first surface 231 is an annular surface as a whole. The first surface 231 includes a portion close to the through hole 237 and a portion away from the through hole 237. The portion away from the through hole 237 is provided with a first recess 235. Figure 3 In the embodiment of the present invention, the first recessed portion 235 is recessed downward.

[0057] The second surface 232 is an annular surface as a whole, similarly to the first surface 231. The second surface 232 includes a portion close to the through hole 237 and a portion away from the through hole 237. The portion close to the through hole 237 is provided with a second recess 236. Figure 3 In the embodiment, the second recess 236 is recessed upward.

[0058] The first recess 235 is an annular recess provided so as to surround the through hole 237 (in other words, so as to surround the rotating shaft 21 coupled to the yoke 23). In one embodiment, the first recess 235 is annular. As described later, a part of the electronic component 6 is inserted into the annular first recess 235.

[0059] The second recessed portion 236 is an annular recessed portion provided so as to surround the through hole 237 (in other words, so as to surround the rotating shaft 21 coupled to the yoke 23). In one embodiment, the second recessed portion 236 is annular.

[0060] The volume of the second recessed portion 236 is smaller than the volume of the first recessed portion 235. The area of ​​the annular bottom surface of the second recessed portion 236 is smaller than the area of ​​the annular bottom surface of the first recessed portion 235.

[0061] When viewed along the through direction of the through hole 237 (in other words, when viewed along the direction along the central axis A1 of the rotating shaft 21 coupled to the yoke 23), the second recess 236 is located inside the first recess 235. As described later, a portion of the first bearing 41 is inserted into the annular second recess 236.

[0062] The yoke 23 is a disk-shaped member formed by bending a metal plate, and has a high rigidity due to the bent portion. The yoke 23 includes an inner half portion 238 which is a portion close to the through hole 237 and an outer half portion 239 which is a portion far from the through hole 237 .

[0063] In other words, the inner half portion 238 is a portion close to the rotating shaft 21 coupled to the yoke 23 , and the outer half portion 239 is a portion far from the rotating shaft 21 coupled to the yoke 23 .

[0064] The inner half 238 and the outer half 239 are continuously connected. The inner half 238 and the outer half 239 have shapes that are recessed in opposite directions along the central axis A1, that is, the Z direction. The inner half 238 is provided with a relatively small diameter annular second recess 236, and the outer half 239 is provided with a relatively large diameter annular first recess 235.

[0065] In the yoke 23 , the direction in which the first recessed portion 235 is recessed and the direction in which the second recessed portion 236 is recessed are opposite to each other.

[0066] At least one magnet 25 is disposed on the outer peripheral surface of the yoke 23. Each magnet 25 is a permanent magnet.

[0067] The yoke 23 also has an outer peripheral edge portion 233 (see Figure 3 , Figure 5At least one magnet 25 is disposed on the outer peripheral surface of the outer peripheral edge portion 233. In one embodiment, the outer peripheral edge portion 233 forms a wall on the outer periphery of the first recess 235. The outer peripheral edge portion 233 has a shape protruding from the bottom of the first recess 235 toward the circuit board 7.

[0068] (1-4-2) Stator

[0069] The stator 3 is arranged outside the rotor 2 when viewed from the central axis A1.

[0070] The stator 3 includes a stator core 31 and a winding portion 33 composed of a plurality of windings wound around the stator core 31 .

[0071] The stator 3 is configured to supply a magnetic force for rotating the rotor 2. The rotational force of the rotor 2 located at a position surrounded by the stator 3 is output to the outside of the motor 12 through the rotating shaft 21.

[0072] The outer peripheral surface of the stator core 31 can be in thermal contact with the inner peripheral surface of the motor case 8. The stator 3 is thermally coupled to the motor case 8. The motor case 8 and the stator 3 can be thermally coupled by direct contact or through a thermally conductive member.

[0073] (1-4-3) Two bearings

[0074] Figure 6 This is a perspective view showing a main part of the motor 12 according to one embodiment in a cutaway manner. A first bearing 41 and a second bearing 42 are assembled to the inner surface of the motor case 8 so as to rotatably support the rotating shaft 21 .

[0075] The first bearing 41 supports a part of the rotating shaft 21 so as to be rotatable around the central axis A1. The second bearing 42 supports another part of the rotating shaft 21 so as to be rotatable around the central axis A1.

[0076] The part of the rotating shaft 21 supported by the first bearing 41 is the second end 212 in the direction along the central axis A1 of the rotating shaft 21. In the direction along the central axis A1, the first end 211 and the second end 212 are located at positions opposite to each other.

[0077] Another part of the rotating shaft 21 supported by the second bearing 42 is a portion 215 between the first end portion 211 and the second end portion 212 of the rotating shaft 21 .

[0078] A part of the first bearing 41 is inserted into the second recessed portion 236. A part of the first bearing 41 is inserted into the second recessed portion 236 via a gap for maintaining non-contact.

[0079] The portion of the first bearing 41 inserted into the second recess 236 is a portion of the first bearing 41 that is close to the circuit board 7 .

[0080] (1-4-4) Circuit Board

[0081] The circuit board 7 is configured to control the supply of electricity to the stator 3 .

[0082] In the motor 12 of the embodiment, the orientation of the circuit board 7 relative to the rotor 2 and the stator 3 coincides with the orientation of the rotating shaft 21 protruding from the motor case 8 .

[0083] In the fan 1 including the electric motor 12 according to one embodiment, the orientation of the circuit board 7 relative to the rotor 2 and the stator 3 coincides with the orientation of the blades 16 relative to the electric motor 12 .

[0084] At least one tall electronic component 6 is mounted on the circuit board 7. The at least one electronic component 6 includes, for example, one or both of an electrolytic capacitor and a choke coil.

[0085] In one embodiment, at least one electronic component 6 is an electronic component 6. The electronic component 6 is, for example, an electrolytic capacitor or a choke coil. A portion of the electronic component 6 is inserted into the first recess 235 (for example, see Figure 3 , Figure 6 ). A portion of the electronic component 6 is inserted into the first recess 235 via a gap for maintaining non-contact.

[0086] The portion of the electronic component 6 inserted into the first recess 235 is a portion of the electronic component 6 that is away from the circuit board 7 .

[0087] In one embodiment, another electronic component 6a having a lower height than the electronic component 6 is further mounted on the circuit board 7. The electronic component 6a is located at a distance from the first recess 235. That is, the electronic component 6a is not inserted into the first recess 235.

[0088] The circuit board 7 has a mounting surface 71 on which the electronic components 6 and 6a are mounted. The mounting surface 71 is oriented in the direction of the rotor 2 relative to the circuit board 7, or in other words, in the direction of the motor 12 relative to the blades 16.

[0089] The circuit board 7 further has a surface 72 facing opposite to the mounting surface 71. The surface 72 faces the direction of the circuit board 7 relative to the rotor 2, or in other words, the direction of the blades 16 relative to the motor 12.

[0090] The circuit board 7 and the motor housing 8 are connected by means of a heat-conducting member 51 (see Figure 3 The heat generated by the electronic components 6 and 6a is conducted to a part of the motor housing 8 (that is, a part 121 of the motor 12) through the circuit board 7 and the component 51.

[0091] (1-4-5) Motor housing

[0092] The motor case 8 is formed by fitting a first member 81 and a second member 82 together.

[0093] The first bearing 41 is disposed on the first member 81 , and the second bearing 42 is disposed on the second member 82 .

[0094] The part 121 of the motor 12 inserted through the opening 140 to a position above the lower surface 147 of the housing 14 is formed by a part of the second member 82 of the motor housing 8. The outer surface of the part 121 of the motor 12 (that is, the part of the second member 82) includes a flat surface 125.

[0095] In a state where the rotating shaft 21 of the rotor 2 and the hub 161 of the blade 16 are coupled, the flat surface 125 of the motor 12 and the flat surface 1613 of the hub 161 are located in parallel with each other with a small gap in between in the air supply housing 14 (see Figure 3 ).

[0096] In the fan 1 of the embodiment, heat generated by the electronic components 6 and 6 a is conducted to a portion of the motor housing 8 exposed in the housing 14 through the circuit board 7 and the member 51 , and is efficiently dissipated in the housing 14 .

[0097] (1-4-6) Positional Relationship of Motor Components

[0098] In one embodiment, the yoke 23 is provided to overlap the tall electronic component 6 mounted on the circuit board 7 when viewed in a direction orthogonal to the central axis A1 of the rotating shaft 21 (in other words, in a radial direction of the rotating shaft 21 ).

[0099] This is because a part of the electronic component 6 is inserted into the first recess 235 of the yoke 23 .

[0100] Since the first recess 235 is an annular recess surrounding the rotating shaft 21 , the electronic component 6 and the yoke 23 are arranged so as to be kept in non-contact with each other even if the rotor 2 including the yoke 23 rotates.

[0101] Furthermore, in one embodiment, the yoke 23 is provided so as to overlap with the first bearing 41 when viewed in a direction perpendicular to the central axis A1 of the rotating shaft 21 .

[0102] This is because a part of the first bearing 41 is inserted into the second recessed portion 236 of the yoke 23 .

[0103] Since the second recessed portion 236 is an annular recessed portion surrounding the rotating shaft 21 , even if the rotor 2 including the yoke 23 rotates, the first bearing 41 and the yoke 23 are provided so as to be kept in non-contact with each other.

[0104] As described above, the circuit board 7 is oriented relative to the rotor 2 in the same direction as the rotation shaft 21 protrudes from the motor housing 8. Therefore, in the fan 1 of one embodiment, the circuit board 7 is located between the rotor 2 and the blades 16 in the direction along the central axis A1 of the rotation shaft 21.

[0105] When the circuit board 7 is in this position, the heat of the circuit board 7 conducted from the electronic components 6 , 6 a and the like is efficiently dissipated by the flow of air formed by the rotation of the blades 16 in the housing 14 .

[0106] (1-5) Moving body

[0107] Figure 7 This is a diagram schematically showing a moving body 9 including a fan 1 according to an embodiment.

[0108] The movable body 9 further includes a battery 92 , a control device 94 , a cable 96 , and a vehicle body 98 .

[0109] The moving object 9 is a four-wheel hybrid vehicle in which an engine and a battery 92 for driving are mounted on a vehicle body 98. The moving object 9 is not limited to a hybrid vehicle, and may be, for example, an electric vehicle.

[0110] The battery 92 is composed of, for example, a lithium ion battery, a nickel-metal hydride battery, or the like, and supplies electric power to the motor 12 , a drive motor for driving the movable body 9 , and the like.

[0111] The control device 94 is electrically connected to the fan 1 via a cable 96 , and controls the motor 12 of the fan 1 .

[0112] In addition, the control device 94 controls the battery 92. More specifically, the control device 94 controls the supply of electric power from the battery 92 to the electric motor 12, the drive motor, and the like.

[0113] The blower 1 , a battery 92 , a control device 94 , and cables 96 are mounted on a vehicle body 98 .

[0114] The fan 1 mounted on the mobile body 9 functions as a cooling fan system for suppressing the temperature rise of the battery 92. By driving the motor 12 in the fan 1 to rotate, the blades 16 rotate, and air is sent to the battery 92. In this way, the battery 92 is air-cooled, and the temperature rise of the battery 92 can be suppressed.

[0115] (2) Modification

[0116] Modifications of the fan 1 are listed below. In the modification of the fan 1, the same reference numerals are given to the same components as those of the above-described embodiment, and detailed descriptions thereof are omitted.

[0117] In one embodiment, the yoke 23 of the rotor 2 has a shape that is curved so as to include the first recess 235 and the second recess 236, but the shape of the yoke 23 is not limited thereto. For example, the yoke 23 may have a shape that is inclined so as to be located further away from the circuit board 7 as viewed from the central axis A1 toward the outside.

[0118] In this case as well, the yoke 23 can be provided so as to overlap with the electronic component 6 when viewed in the radial direction of the rotating shaft 21. In addition, the yoke 23 can be provided so as to overlap with the first bearing 41 when viewed in the radial direction of the rotating shaft 21.

[0119] The yoke 23 may include only one of the first recess 235 and the second recess 236. In this case as well, the yoke 23 can be provided so as to overlap both the electronic component 6 and the first bearing 41 when viewed in the radial direction of the rotating shaft 21.

[0120] In the motor 12 of one embodiment, in order to support the rotating shaft 21, in addition to the first bearing 41 overlapping with the yoke 23, the second bearing 42 not overlapping with the yoke 23 is provided, but the yoke 23 can also be provided to overlap with both the first bearing 41 and the second bearing 42 when viewed in the radial direction of the rotating shaft 21. In addition, the motor 12 does not need to include the second bearing 42.

[0121] In one embodiment, the orientation of the circuit board 7 relative to the rotor 2 and the stator 3 is consistent with the orientation of the rotating shaft 21 protruding from the motor housing 8, but this positional relationship may be reversed. In other words, the orientation of the circuit board 7 relative to the rotor 2 and the stator 3 may be opposite to the orientation of the rotating shaft 21 protruding from the motor housing 8. In this case, the orientation of the mounting surface 71 of the circuit board 7 is consistent with the orientation of the blade 16 relative to the motor 12.

[0122] In one embodiment, one electronic component 6 is inserted into the first recess 235 , but a plurality of electronic components 6 may be inserted into the first recess 235 . In this case, the plurality of electronic components 6 overlap the yoke 23 when viewed in the radial direction of the rotation shaft 21 .

[0123] In the fan 1 of the embodiment, the hub 161 provided on the blades 16 is flat, but the shape of the hub 161 is not limited thereto. For example, the center portion of the hub 161 may have a bulging shape protruding from the motor housing 8 toward the rotating shaft 21 .

[0124] (3) Summary

[0125] As described above, the first embodiment of the electric motor (12) includes: a rotor (2) including a rotating shaft (21); a stator (3) arranged outside the rotor (2) when viewed from the rotating shaft (21); a bearing (41) supporting the rotating shaft (21) so as to be rotatable; and a circuit board (7) on which at least one electronic component (6) is mounted. The rotor (2) also includes a yoke (23) connected to the rotating shaft (21). When viewed from a direction orthogonal to the central axis (A1) of the rotating shaft (21), the yoke (23) is arranged to overlap with the bearing (41) and overlap with at least one electronic component (6).

[0126] According to this embodiment, the height of the electric motor (12) can be reduced in the direction along the central axis (A1) of the rotating shaft (21) of the electric motor (12).

[0127] In the second embodiment of the electric motor (12), based on the first embodiment, the yoke (23) has a surface (231) facing the circuit board (7), and the surface (231) includes a recess (235) for partially inserting at least one electronic component (6).

[0128] According to this embodiment, at least one electronic component (6) and the yoke (23) can be effectively overlapped by utilizing the recessed portion (235) of the yoke (23).

[0129] In the third aspect of the electric motor (12), in addition to the second aspect, the recess (235) is an annular recess provided so as to surround the rotating shaft (21).

[0130] According to this embodiment, at least one electronic component (6) and the yoke (23) can be effectively overlapped by utilizing the annular recess (235) provided on the yoke (23).

[0131] A fourth aspect of the electric motor (12) is a motor according to any one of the first to third aspects, wherein the yoke (23) has a surface (232) facing the bearing (41). The surface (232) includes a recess (236) into which a portion of the bearing (41) is inserted.

[0132] According to this embodiment, the bearing (41) and the yoke (23) can be effectively overlapped by utilizing the recessed portion (236) of the yoke (23).

[0133] The fifth aspect of the electric motor (12) is based on the fourth aspect, wherein the recess (236) is an annular recess provided so as to surround the rotating shaft (21).

[0134] According to this aspect, the bearing (41) and the yoke (23) can be effectively overlapped by utilizing the annular recess (236) provided on the yoke (23).

[0135] The sixth embodiment of the electric motor (12) is based on the first embodiment, wherein the yoke (23) has a first surface (231) facing the circuit board (7) and a second surface (232) facing the first surface (231). The first surface (231) includes a first recess (235) for partially inserting at least one electronic component (6). The second surface (232) includes a second recess (236) for partially inserting a bearing (41).

[0136] According to this method, at least one electronic component (6) and the yoke (23) can be effectively overlapped by utilizing the first recess (235) of the yoke (23), and the bearing (41) and the yoke (23) can be effectively overlapped by utilizing the second recess (236) of the yoke (23).

[0137] According to a seventh aspect of the electric motor (12), in addition to the sixth aspect, the yoke (23) includes an inner half portion (238) which is a portion of the yoke (23) close to the rotating shaft (21) and an outer half portion (239) which is a portion of the yoke (23) far from the rotating shaft (21). The first recess (235) is provided in the outer half portion (239). The second recess (236) is provided in the inner half portion (238).

[0138] According to this method, at least one electronic component (6) and the yoke (23) can be effectively overlapped by using the first recess (235) provided on the outer half (239) of the yoke (23), and the bearing (41) and the yoke (23) can be effectively overlapped by using the second recess (236) provided on the inner half (238) of the yoke (23).

[0139] A fan (1) according to an eighth aspect comprises: a motor (12) according to any one of the first to seventh aspects; and a blade (16) coupled to a rotating shaft (21) of the motor (12).

[0140] According to this embodiment, by reducing the height of the electric motor (12), the height of the fan (1) as a whole can be reduced.

[0141] A fan (1) according to a ninth aspect is configured according to the eighth aspect, wherein the blade (16) comprises: a flat-plate-shaped hub (161) coupled to the rotating shaft (21); and a plurality of blade plates (165) connected to the hub (161).

[0142] According to this mode, the hub (161) of the blade (16) is flat, so that noise reduction during operation can be achieved. In addition, the hub (161) of the blade (16) coupled to the motor (12) can be easily arranged flatly by lowering the height of the motor (12).

[0143] In the fan (1) of the tenth aspect, based on the eighth aspect or the ninth aspect, the circuit board (7) is located between the rotor (2) and the blades (16) in the direction along the central axis (A1) of the rotating shaft (21).

[0144] According to this method, the heat generated by the electronic components (6) mounted on the circuit board (7) can be conducted to the portion close to the blade (16), and the heat can be efficiently dissipated by air cooling at this portion.

[0145] A moving body (9) according to an eleventh aspect comprises: the fan (1) according to any one of the eighth to tenth aspects; and a body (98) which accommodates the fan (1).

[0146] According to this aspect, it is possible to provide a moving body (9) including a fan (1) with a reduced height.

[0147] Industrial Applicability

[0148] According to the motor, fan, and mobile object disclosed in the present invention, the motor can be made low-profile, and the fan can be made low-profile by using the low-profile motor, and the fan can be easily mounted on the mobile object. Thus, the motor, fan, and mobile object disclosed in the present invention are useful in industry.

[0149] Description of Reference Numerals

[0150] 1. fan; 12. motor; 121. part; 125. flat surface; 14. housing; 140. opening; 141. first member; 142. second member; 144. air inlet; 145. outlet; 146. flow path; 147. lower surface; 16. blade; 161. hub; 1612, 1613. flat surface; 1612a. peripheral portion; 1615. connecting portion; 165. blade plate; 165a. inner peripheral side end portion; 165b. outer peripheral side end portion; 2. rotor; 2 1. Rotating shaft; 23. Yoke; 231. First surface; 232. Second surface; 233. Outer peripheral edge; 235. First recess; 236. Second recess; 238. Inner half; 239. Outer half; 3. Stator; 41. First bearing; 42. Second bearing; 6, 6a. Electronic components; 7. Circuit board; 71. Mounting surface; 72. Surface; 8. Motor housing; 81. First member; 82. Second member; 9. Moving body; 98. Vehicle body; A1, A2, center axis.

Claims

1. An electric motor, wherein: The motor has: a rotor including a rotating shaft; a stator disposed outside the rotor when viewed from the rotating shaft; a bearing that rotatably supports the rotating shaft; and A circuit board having at least one electronic component mounted thereon, The rotor further includes a yoke connected to the rotating shaft. The yoke is provided so as to overlap the bearing and the at least one electronic component when viewed in a direction perpendicular to the central axis of the rotating shaft.

2. The electric motor according to claim 1, wherein: The yoke has a surface opposite to the circuit board, The surface includes a recessed portion into which a portion of the at least one electronic component is inserted.

3. The electric motor according to claim 2, wherein: The recessed portion is an annular recessed portion provided so as to surround the rotating shaft.

4. The electric motor according to claim 1, wherein: The yoke has a surface opposite to the bearing, The surface includes a recessed portion for partial insertion of the bearing.

5. The electric motor according to claim 4, wherein: The recessed portion is an annular recessed portion provided so as to surround the rotating shaft.

6. The electric motor according to claim 1, wherein: The magnetic yoke has: a first side, which is opposite to the circuit board; and a second side, which faces opposite to the first side, The first surface includes a first recessed portion for partially inserting the at least one electronic component. The second surface includes a second recessed portion into which a portion of the bearing is inserted.

7. The electric motor according to claim 6, wherein: The magnetic yoke comprises: an inner half portion, which is a portion of the yoke close to the rotation axis; and an outer half, which is a portion of the yoke away from the rotation axis, The first recess is provided in the outer half portion, The second recess is provided in the inner half portion.

8. A fan, wherein: The fan has: The electric motor according to any one of claims 1 to 7; and A blade is coupled to the rotating shaft of the motor.

9. The fan according to claim 8, wherein: The blade has: a flat-plate-shaped hub coupled to the rotating shaft; and A plurality of blade plates are connected to the hub.

10. The fan according to claim 8, wherein: The circuit board is located between the rotor and the blades in a direction along the central axis of the rotation shaft.

11. A mobile body, wherein: The mobile body has: The fan according to any one of claims 8 to 10; and The vehicle body accommodates the fan.

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