Motor and air supply device

Abstract

A motor has a rotor, a stator opposed to the rotor in a radial direction, a circuit board, and a resin portion covering at least a portion of the stator and the circuit board. The stator has an electrically conductive pin projecting downward in an axial direction compared to a lower portion of a stator core and electrically connected to a wire to electrically connect a coil to the circuit board. The resin portion has a first resin portion covering the stator core and the coil, a second resin portion covering the circuit board, and a third resin portion disposed between the first resin portion and the second resin portion and covering the electrically conductive pin. At least a portion of an outer circumferential surface of the third resin portion intersecting an extension line extending from a center axis toward the electrically conductive pin is disposed radially outward of a radially outermost portion of the first resin portion.

Description

TECHNICAL FIELD

[0001] The present application relates to a motor and an air-blowing device including the motor. BACKGROUND

[0002] A molded motor of the related art has a stator, a stator portion in which the stator in which a winding is wound and a control printed board having an inner diameter larger than that of the stator and incorporating a lead wire are connected, and a rotor portion including a magnet at a position opposite to an outer circumferential side of the stator portion.

[0003] Further, the stator is molded by resin, and the winding coil and the lead wire for motor power supply are sealed by the resin, and are cut off from outside air.

[0004] Thus, water-proof, drip-proof, and rust-proof capabilities can be improved (see, for example, Japanese Laid-Open Patent Publication No. 2000-324745).

[0005] However, in the molded motor described above, resin molding is performed along with the radial size of the stator in the axial direction, and thus the resin is thin at the lead wire portion. Therefore, the resin can peel off at the lead wire portion, and the lead wire can be exposed. SUMMARY

[0006] Therefore, an object of the present application is to provide a motor in which exposure of a pin connecting a board and a coil is suppressed and stable driving is performed for a long period of time.

[0007] Further, an object is to provide an air-blowing device in which a stable air volume is discharged for a long period of time.

[0008] An exemplary motor of the present application has a rotor configured to be rotatable about a central axis extending in a vertical direction, a stator disposed radially inward of the rotor and opposite the rotor in the radial direction, a circuit board disposed axially below the stator, and a resin portion covering at least a portion of the stator and the circuit board. The stator has a stator core portion having a plurality of teeth extending radially outward, a coil formed by winding a wire around the teeth, and a conductive pin projecting axially downward from a lower portion of the stator core portion, electrically connected to the wire and electrically connecting the coil to the circuit board. The resin portion has a first resin portion covering at least both ends of the stator core portion in the axial direction and the coil, a second resin portion covering the circuit board, and a third resin portion disposed axially between the first resin portion and the second resin portion and covering the conductive pin. At least a portion of an outer circumferential surface of the third resin portion intersecting an extension line extending from the central axis toward the conductive pin is disposed radially outward of a radially outermost portion of the first resin portion.

[0009] An exemplary air supply device of the present invention includes: the motor described above; and an impeller mounted on the rotor and generating airflow by rotation.

[0010] The exemplary motor according to the present invention can suppress the exposure of the pins connecting the substrate and the coil, and can be driven stably for a long period of time. Furthermore, the exemplary air supply device according to the present invention can discharge a stable air volume for a long period of time.

[0011] The above and other features, elements, steps, characteristics and advantages of the present invention will be more clearly understood with reference to the accompanying drawings, provided that the preferred embodiments of the present invention are described in detail below. Attached Figure Description

[0012] Figure 1 This is a three-dimensional view of the battery cell from below.

[0013] Figure 2 This is a three-dimensional view of the air supply device from above.

[0014] Figure 3 This is an exploded 3D view of the air supply device.

[0015] Figure 4 This is a longitudinal section view of the air supply device.

[0016] Figure 5 This is an enlarged cross-sectional view of the motor.

[0017] Figure 6 This is a top view showing the stator mounted on the lower cover of the housing.

[0018] Figure 7 This is a top view showing the state of the stator with the first modified example.

[0019] Figure 8 This is an enlarged cross-sectional view of the third resin section of the resin division.

[0020] Figure 9 This is an enlarged sectional view of the air supply device in the second variation.

[0021] Figure 10 This is an enlarged sectional view of the motor in the third variation.

[0022] Figure 11 This is an enlarged sectional view of the motor, which is another example of the third variation. Detailed Implementation

[0023] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Furthermore, in this embodiment, the central axis Cx of the air supply device A and the motor 100 is shared. In this specification, the direction parallel to the central axis Cx is referred to as the "axial direction," the direction orthogonal to the central axis Cx is referred to as the "radial direction," and the direction along an arc centered on the central axis Cx is referred to as the "circumferential direction."

[0024] Furthermore, in this specification, the shape and positional relationship of each part in the air supply device A are described with the axial direction as the vertical direction and the air inlet 305 side of the housing 300 as the top. The vertical direction is merely a name used for illustrative purposes and does not limit the positional relationship and direction of the air supply device A and the motor 100 in actual use. Moreover, the upstream and downstream directions of the airflow direction generated when the impeller 200 rotates are simply referred to as "upstream" and "downstream".

[0025] An exemplary air supply device A of the present invention is used, for example, to cool a battery cell BU. Here, the battery cell BU will be described with reference to the accompanying drawings. Figure 1 This is a 3D view of the battery unit (BU) from below.

[0026] like Figure 1 As shown, the battery unit BU has a cuboid housing CA, inside which are disposed battery packs (not shown), a charging control unit, etc. The housing CA is formed of a material with high thermal conductivity, such as aluminum alloy. The housing CA has a flow path (not shown) for airflow within it, and has an inlet (not shown) for airflow into the flow path and an outlet (not shown) for airflow out. Furthermore, the flow path is separated from the portion housing the internal equipment, preventing direct contact between the airflow flowing in the flow path and the items housed in the housing CA. As a result, the housing CA is waterproof and dustproof.

[0027] In the housing CA, an outlet is formed on the lower surface CA1, and the air supply device A is configured such that the air inlet 305 (described later) is continuous with the outlet. The air supply device A draws in air from the air inlet 305 and discharges the air from the exhaust 306 (described later). Furthermore, by drawing in air from the air inlet 305, an airflow from the inlet to the outlet is generated in the flow path of the housing CA.

[0028] In the battery cell BU, as airflow moves within the flow path, heat generated from the devices disposed inside the battery cell BU is dissipated by the airflow. As a result, the battery cell BU is cooled. Furthermore, the cooling method for the battery cell BU is not limited to the method of having airflow move within the internal flow path. For example, a heat sink that contacts the housing CA and transfers heat from inside the housing CA can be provided, and the airflow from the air supply device A can be used to cool the heat sink, thereby cooling the battery cell BU.

[0029] Figure 2 This is a three-dimensional view of the air supply device A from above. Figure 3 This is an exploded perspective view of the air supply device A. Figure 4 This is a longitudinal section view of the air supply device A. Figure 5 This is an enlarged cross-sectional view of the third resin section 63. (See image.) Figure 2 , Figure 3 As shown, the air supply device A includes a motor 100, an impeller 200, and a housing 300. The motor 100 and impeller 200 are disposed within the housing 300. The motor 100 is fixed to the housing 300, and the impeller 200 is rotated inside the housing 300. By rotating the impeller 200, air is conveyed radially outward. The airflow conveyed radially outward moves along the outer periphery of the housing 300 and is discharged from the exhaust section 306. Air flows in from the intake section 305 by utilizing the airflow generated by the rotation of the impeller 200.

[0030] like Figure 3 As shown, the motor 100 includes a rotor 10, a stator 20, a circuit board 30, a shaft 40, a bearing section 50, and a resin section 60. The motor 100 is a so-called external rotor type brushless DC motor, in which the rotor 10, which is radially opposite to the stator 20, rotates about a central axis.

[0031] The rotor 10 is configured to rotate about a central axis Cx extending in the vertical direction. Further, the rotor 10 has a rotor housing 11, a rotor magnet 12, and a shaft fixing portion 13. The rotor housing 11 is a covered cylindrical shape formed of magnetic material, having a cover portion 111, a cylindrical portion 112, and a flange portion 113. The cover portion 111 is annular with a through hole 114 extending axially through the center. The cylindrical portion 112 is cylindrical and extends axially from the radial outer edge of the cover portion 111. The rotor magnet 12 is fixed to the inner circumferential surface of the cylindrical portion 112.

[0032] A shaft fixing part 13 is fixed in the through hole 114 of the cover 111, and a shaft 40 is fixed in the shaft fixing part 13. In other words, the shaft fixing part 13 fixes the shaft 40 and the rotor housing 11. That is, the rotor 10 and the shaft 40 are fixed by the shaft fixing part 13. The flange 113 extends radially outward from the end of the cylindrical part 112 on the side opposite to the cover 111 in the axial direction. The flange 113 is annular.

[0033] The rotor magnet 12 is cylindrical. At least the inner circumferential surface of the rotor magnet 12 is configured such that the N pole and the S pole are alternately arranged in the circumferential direction. In this embodiment, the rotor magnet 12 is cylindrical, but it is not limited to this. For example, multiple flat magnets may be fixed to the cylindrical rotor core in a circumferential arrangement.

[0034] The stator 20 is disposed radially inside the rotor 10 and is radially opposite to the rotor 10. Further, the stator 20 includes a stator core 21, an insulator 22, a coil 23, and conductive pins 24. The stator core 21 is a laminate of electromagnetic steel sheets stacked axially. However, the stator core 21 is not limited to a laminate of electromagnetic steel sheets; it can also be a component produced by powder firing, casting, etc.

[0035] The stator core 21 has an annular core back 211 and a plurality of pole teeth 212. That is, the stator 20 includes a stator core 21 having a plurality of pole teeth 212 extending radially outward. The inner surface of the annular core back 211 is fixed to the outer surface of the bushing 51 of the bearing portion 50 (described later). Thus, the center of the stator core 21 overlaps with the central axis Cx of the motor 100. Furthermore, the core back 211 and the bushing 51 only need to be fixed relative to each other. For example, a fixing member can be placed between the core back 211 and the bushing 51.

[0036] Multiple pole teeth 212 extend radially outward from the outer peripheral surface of the core back 211. The multiple pole teeth 212 are arranged at equal intervals in the circumferential direction. An insulator 22, for example made of an insulating material such as resin, at least covers the pole teeth 212. A coil 23 is formed by winding a wire over the insulator 22 covering the pole teeth 212. That is, the coil 23 is formed by winding a wire around the pole teeth 212. In the coil 23, currents from three systems with different phases (hereinafter referred to as three-phase) are supplied to the motor 100. The currents of the three phases are respectively designated as U-phase current, V-phase current, and W-phase current. Furthermore, any one of the three-phase currents is supplied to the coil 23.

[0037] The insulator 22 electrically insulates the stator core 21, including the pole teeth 212, from the coil 23. That is, the stator 20 has an insulator 22 disposed between the pole teeth 212 and the coil 23 and possessing insulating properties. Furthermore, the insulator 22 is not limited to resin; a wide range of materials capable of insulating the stator core 21 from the coil 23 can be used. Additionally, if the conductor is insulated from the pole teeth 212, the insulator 22 may be omitted.

[0038] A conductive pin 24 is mounted on the lower end of the insulator 22 and protrudes axially downward. The end of the wire forming the coil 23 is wound around the conductive pin 24. Furthermore, the conductive pin 24 extends straight axially downward, that is, the conductive pin 24 is not bent. As a result, the wire can be easily wound around the conductive pin 24.

[0039] Furthermore, the conductive pin 24 is electrically connected to the coil 23 by soldering it to the wire. Alternatively, if the wire is electrically connected to the conductive pin 24 by winding it around the conductive pin 24, the soldering can be omitted. Moreover, the conductive pin 24 is electrically connected to the patterned wiring formed on the circuit board 30. That is, the conductive pin 24 protrudes axially downwards from the lower part of the stator core 21 and is electrically connected to the wire, thereby electrically connecting the coil 23 to the circuit board 30.

[0040] To further explain, the conductive pin 24 is inserted into the conductive pin holding portion 221 formed in the insulator 22. Thus, the conductive pin 24 is fixed to the insulator 22. That is, the insulator 22 has a conductive pin holding portion 221 with an opening at its lower end that accommodates the conductive pin 24.

[0041] The bearing portion 50 includes a bushing 51 and a bearing member 52. The bushing 51 is cylindrical and is fixed to a bushing retaining portion 307 that protrudes axially upward from the upper surface of the lower cover 303 of the housing 300. Furthermore, as a means of fixing the bushing 51 to the bushing retaining portion 307, pressing is possible, but it is not limited to this method; any method that can securely fix the bushing 51 to the bushing retaining portion 307 of the lower cover 303 can be widely used. Thus, the center of the bushing 51 overlaps with the central axis Cx of the motor 100.

[0042] The bearing section 50 is equipped with two bearing members 52. The two bearing members 52 are arranged inside the bushing 51 with an axial gap. The bearing members 52 are ball bearings, with the outer ring fixed to the inner surface of the bushing 51 and the inner ring fixed to the shaft 40. Thus, the shaft 40 is supported by the bushing 51 fixed to the housing 300 and is rotatable. Moreover, by axially separating the two bearing members 52, tilting of the shaft 40 relative to the central axis Cx can be suppressed.

[0043] The circuit board 30 is disposed axially below the stator 20. Patterned wiring is formed on the circuit board 30. Electronic components are disposed on the circuit board 30, and a circuit is formed that uses the electronic components through the patterned wiring. For example, a power supply circuit for supplying power to the coil 23 can be provided as the circuit board 30. Other circuits may also be formed therein. Through-holes are formed on the circuit board 30, and conductive pins 24 pass through the through-holes. The conductive pins 24 are fixed to the patterned wiring of the circuit board 30 by soldering. Thus, the conductive pins 24 are electrically connected to the patterned wiring of the circuit board 30.

[0044] Current is supplied to the coil 23 from the power supply circuit formed on the circuit board 30 via the conductive pins 24. U-phase current, V-phase current, and W-phase current are supplied to the coil 23 respectively. Therefore, the motor 100 has three conductive pins 24.

[0045] The resin section 60 will be described with reference to the new accompanying drawings.Figure 6 This is a top view showing the stator 20 mounted on the lower cover 303 of the housing 300. (See attached image.) Figure 4 , Figure 6 As shown, the resin portion 60 covers the upper and lower axial ends of the stator 20 and the circuit board 30. That is, the resin portion 60 covers at least a portion of the stator 20 and the circuit board 30. The resin portion 60 has a first resin portion 61, a second resin portion 62, and a third resin portion 63.

[0046] like Figures 3 to 6 As shown, the first resin portion 61 covers both ends of the stator core portion 21 in the axial direction. That is, the first resin portion 61 is cylindrical in shape, covering the insulator 22 of the pole teeth 212 disposed on the stator core portion 21 and the coil 23. In other words, the first resin portion 61 covers at least both ends of the stator core portion 21 in the axial direction and the coil 23. As a result, the first resin portion 61 suppresses the adhesion of water, dust, dirt, etc. to the coil 23.

[0047] Furthermore, even if water, dust, or dirt adheres to the radial outer edge of the pole teeth 212 of the stator core 21, the impact on the operation of the motor 100 is minimal. Therefore, in the motor 100 of this embodiment, the radial outer edge of the pole teeth 212 is not covered by the first resin portion 61. That is, the first resin portion 61 is not disposed on the radial outer side of the pole teeth 212. Therefore, the radial gap between the pole teeth 212 and the rotor magnet 12 can be reduced. As a result, the magnetic force generated between the pole teeth 212 and the rotor magnet 12 when current flows through the coil 23 can be increased, and the torque of the motor 100 can be increased.

[0048] The second resin portion 62 covers the circuit board 30. For example... Figure 4 , Figure 6 As shown, the circuit board 30 is plate-shaped and orthogonal to the central axis Cx. The second resin portion 62 is also plate-shaped and orthogonal to the central axis Cx because it covers the circuit board 30. The second resin portion 62 is fixed to the lower cover 303 of the housing 300. The second resin portion 62 covers the pattern wiring of the circuit board 30 and the electronic components disposed on the circuit board 30 and connected to the pattern wiring formed on the surface of the circuit board 30. As a result, foreign matter such as water, dust, and dirt can be suppressed from adhering to the pattern wiring and electronic components.

[0049] The third resin portion 63 is axially disposed between the first resin portion 61 and the second resin portion 62. For example... Figure 4 , Figure 5 As shown, the third resin portion 63 covers the conductive pin 24. That is, the third resin portion 63 is axially disposed between the first resin portion 61 and the second resin portion 62 and covers the conductive pin 24.

[0050] Moreover, such as Figure 3As shown, the outer peripheral surface of the third resin portion 63 is circular in shape with the same outer diameter as the outer peripheral surface of the first resin portion 61. Furthermore, the outer peripheral surface of the third resin portion 63 has a plurality of radially protruding portions 631. Figure 3 , Figure 6 As shown, the protrusion 631 is a column with a fan-shaped bottom surface. However, the protrusion 631 is not limited to a column with a fan-shaped bottom surface. For example, the bottom surface of the protrusion 631 can also be a polygonal shape such as a triangle or rectangle. Furthermore, it is not limited to a column shape; it can also be a cone, or a frustum shape with the upper end of a cone cut off. Additionally, it can also be a shape that forms part of a sphere.

[0051] like Figure 4 As shown, the third resin portion 63 covers the conductive pin 24. That is, in the axial direction, the third resin portion 63 is disposed between the first resin portion 61 and the second resin portion 62 and covers the conductive pin 24.

[0052] The protrusion 631 and the third resin portion 63 are formed by a single component, with the protrusion 631 positioned radially outward from the outer peripheral surface of the third resin portion 63. The third resin portion 63 has a plurality of protrusions 631 positioned radially outward from the conductive pin 24 and overlapping the conductive pin 24 radially. Thus, the plurality of protrusions 631 are arranged circumferentially, and at least the portion of the outer peripheral surface intersecting the extension line extending from the central axis Cx toward the conductive pin 24 is positioned radially outward from the outer edge of the first resin portion 61.

[0053] That is, at least the portion of the outer peripheral surface of the third resin portion 63 that intersects with the extension line extending from the central axis Cx toward the conductive pin 24 is configured to be radially outerer than the radial outermost part of the first resin portion 61.

[0054] Thus, by covering the conductive pin 24 with the third resin portion 63, the thickness of the resin covering the conductive pin 24 increases. The conductive pin 24 becomes less likely to be exposed to the outside, suppressing contact between the conductive pin 24 and the wires by foreign objects such as water, dust, and dirt. Furthermore, by increasing the thickness of the resin covering the conductive pin 24 with the third resin portion 63, peeling between the conductive pin 24 and the resin covering it is suppressed. As a result, the waterproof and dustproof performance of the motor 100 is improved, enabling the motor 100 to operate stably for a longer period. (Effects of the first invention) Moreover, compared to the case where the third resin portion 63 protrudes throughout its circumference, the amount of resin used in the resin portion 60 is reduced, making the motor 100 lighter.

[0055] Moreover, such as Figure 4As shown, the upper part of the insulator 22 is covered by the first resin portion 61, and the lower end of the conductive pin holding portion 221 of the insulator 22 is covered by the third resin portion 63. That is, a portion of the insulator 22 is covered by the first resin portion 61, and at least the lower end of the conductive pin holding portion 221 is covered by the third resin portion 63. With the above configuration, the entire conductive pin can be covered by resin and insulator. As a result, the conductive pin is less likely to be exposed, which improves the waterproof performance of the motor.

[0056] And, as Figure 4 As shown, the upper surface 632 of the protrusion 631 is axially opposed to the rotor magnet 12 of the rotor 10. Furthermore, even when the protrusion is a cone, a part of a sphere, or otherwise lacks an upper surface, the protrusion still overlaps axially with the rotor magnet 12 of the rotor 10. That is, at least a portion of the third resin portion 63 overlaps axially with at least a portion of the rotor 10.

[0057] The rotor 10 and the resin section 60 are positioned opposite each other in the axial direction, thus preventing air from easily flowing into the gap between the rotor 10 and the resin section 60. Therefore, rotational turbulence of the rotor 10 caused by air inflow is suppressed. This allows the motor 100 to rotate stably. Furthermore, it prevents foreign matter such as water, dust, and dirt from flowing into the interior of the motor 100 along with airflow.

[0058] In the motor 100 of this embodiment, the first resin portion 61, the second resin portion 62, and the third resin portion 63 are formed from a single component. With this configuration, gaps are less likely to form between the resin portions, preventing foreign matter such as water, dust, and dirt from entering the motor 100. However, the resin portion 60 is not limited to this. Where gaps can be suppressed during connection, the first resin portion 61, the second resin portion 62, and the third resin portion 63 can also be different components, and any one resin portion can be formed independently of the others.

[0059] like Figure 3 , Figure 4 As shown, the housing 300 has a lower cover 303 and an upper cover 304. The upper cover 304 is mounted axially above the lower cover 303 within the housing 300. The motor 100 and impeller 200 are disposed within the internal space 301 of the housing 300.

[0060] The housing 300 has an air inlet 305 and an exhaust 306. The air inlet 305 is disposed on the upper surface of the upper cover 304 and extends through it axially.

[0061] The housing 300 has a cylindrical portion 302 extending tangentially along its radial outer edge. An exhaust portion 306 is an opening formed at the end of the cylindrical portion 302. Inside the housing 300, airflow drawn in from the intake portion 305 flows circumferentially within the internal space 301 due to the rotation of the impeller 200, and is discharged to the outside through the exhaust portion 306.

[0062] The lower cover 303 has a bushing retaining portion 307. The bushing retaining portion 307 is a cylinder centered on the central axis Cx, extending axially upward from the bottom surface of the lower cover 303. A bushing 51 is disposed inside the bushing retaining portion 307. The outer peripheral surface of the bushing 51 contacts the inner peripheral surface of the bushing retaining portion 307, and the bushing 51 is fixed to the bushing retaining portion 307.

[0063] In the motor 100, the bushing 51 is fixed to the bushing retaining portion 307 of the lower cover 303 of the housing 300. Furthermore, the circuit board 30 is disposed at the bottom of the lower cover 303. The stator core 21, on which the insulator 22 and coil 23 are disposed, is fixed to the bushing 51. At this time, the end of the wire of the coil 23 is wound around the conductive pin 24 and electrically connected by soldering. The conductive pin 24 is electrically connected to the patterned wiring of the circuit board 30 by soldering.

[0064] In this state, after installing the mold surrounding the stator 20 and the circuit board 30 and allowing molten resin to flow into the mold, the resin portion 60 is formed by cooling. Furthermore, with the above configuration, the resin portion 60 covers the stator 20 and the circuit board 30. This prevents foreign matter such as water, dust, and dirt from entering the circuitry of the motor 100.

[0065] The impeller 200 is disposed inside the housing 300. The impeller 200 has a base plate 201, multiple blades 202, a mounting part 203, and a connecting part 204. That is, the impeller 200 has multiple blades 202.

[0066] The base plate 201 is annular in shape with a through hole 205 extending radially through the center. The base plate 201 is orthogonal to the central axis Cx. Multiple blades 202 are mounted on the base plate 201. The multiple blades 202 are arranged at equal intervals in the circumferential direction. The mounting part 203 is cylindrical in shape, protruding axially from the edge of the through hole 205 in the base plate 201.

[0067] The inner circumferential surface of the mounting portion 203 contacts the outer circumferential surface of the cylindrical portion 112 of the rotor housing 11. At this time, the axially lower surface of the mounting portion 203 contacts the flange portion 113 of the rotor housing 11. Thus, the impeller 200 is axially positioned and mounted on the rotor 10. That is, the mounting portion 203 fixes the blade 202 and the rotor 10.

[0068] Furthermore, the mounting portion 203 and the cylindrical portion 112 can be fixed, for example, by pressing. Regarding the fixing method, pressing is not limited to; various fixing methods that can firmly fix the mounting portion 203 and the cylindrical portion 112, such as bonding, welding, and fusion, can be widely used.

[0069] The connecting part 204 is annular. The connecting part 204 contacts the lower surface of the base plate 201 and the flange 113, connecting the rotor 10 and the impeller 200. If the rotor 10 and the impeller 200 are securely fixed, the connecting part 204 can be omitted. In the air supply device A, the impeller 200 is mounted on the rotor 10 and generates airflow through rotation.

[0070] like Figure 4 As shown, the protrusion 631 of the third resin section 63 is located radially inward from the mounting section 203. That is, the third resin section 63 is configured radially inward from the mounting section 203. With the above configuration, the gap between the impeller 200 and the third resin section 63 can be narrowed to suppress air inflow into the gap and improve the air delivery efficiency of the air supply device A. (Effects of the tenth invention) In particular, when using the third resin section 63a, the gap between the impeller 200 and the third resin section 63a is narrowed throughout the entire circumferential range, thereby increasing the effect of improving the air delivery efficiency of the air supply device A.

[0071] Moreover, such as Figure 4 As shown, the upper end of the third resin section 63 is positioned axially downwards from the lower end of the impeller 200. With this configuration, even if the impeller 200 vibrates during rotation, contact between the impeller 200 and the protrusion 631 can be suppressed.

[0072] Figure 7 This is a top view showing the stator 20a in the state of maintaining the first modified example. Figure 8 This is an enlarged cross-sectional view of the third resin portion 63a of resin portion 60a. In the first modified example of resin portion 60a, the third resin portion 63a has an annular portion 633 instead of the protrusion 631 of the third resin portion 63. The other parts of resin portion 60a have the same structure as resin portion 60. Therefore, the parts of resin portion 60a that are substantially the same as those of resin portion 60 are labeled with the same reference numerals, and detailed descriptions of the same parts are omitted.

[0073] like Figure 7 As shown, the third resin portion 63a has an annular portion 633. The annular portion 633 extends radially outward from the third resin portion 63a. The annular portion 633 is annular and is arranged radially outward than the first resin portion 61 over its entire circumference.

[0074] That is, the third resin portion 63a has an annular portion 633. The annular portion 633 is arranged radially outward from the first resin portion 61 throughout its circumference. With the above configuration, the rigidity of the resin portion 60a can be improved. Moreover, since it is arranged radially outward from the first resin portion 61 throughout its circumference, the gap between the rotor 10 and the third resin portion 63a can be reduced, and air and foreign matter such as water, dust, and dirt flowing with the air can be prevented from entering through the gap between the rotor 10 and the resin portion 60a. As a result, the motor 100 can rotate stably for a longer period of time. In addition, in this modified example, the annular portion 633 is circular in plan view, but it is not limited to this. For example, it may also be elliptical, rectangular, or polygonal in shape.

[0075] Figure 9 This is an enlarged cross-sectional view of the air supply device B in the second variation. Figure 9 In the air supply device B shown, the lower end of the impeller 200 is positioned differently from that in air supply device A. All other aspects of air supply device B have the same structure as air supply device A. Therefore, the parts of air supply device B that are substantially the same as those in air supply device A are labeled with the same symbols, and detailed descriptions of these identical parts are omitted.

[0076] Moreover, such as Figure 9 As shown, in the air supply device B, the upper end of the third resin section 63 is positioned axially above the lower end of the impeller 200. With this configuration, a labyrinth structure is formed by the lower end of the impeller 200 and the third resin section 63. By forming a labyrinth structure, the airflow path becomes narrower and more complex, thus making airflow difficult. Furthermore, by forming a labyrinth structure, the airflow path becomes longer. As a result, airflow is less likely to flow between the impeller 200 and the third resin section 63, suppressing the entry of foreign matter such as water, dust, and dirt. Consequently, the motor 100 can rotate stably for a longer period.

[0077] Figure 10 This is an enlarged cross-sectional view of the motor 100c of the third variation. Figure 10 In the motor 100c shown, the protrusion 631c of the third resin portion 63c of the resin portion 60 covers the electronic component 31 disposed on the circuit board 30. Apart from this, the motor 100c has the same structure as the motor 100. Therefore, the parts of the motor 100c that are substantially the same as those of the motor 100 are labeled with the same reference numerals, and detailed descriptions of the same parts are omitted.

[0078] exist Figure 10In the illustrated motor 100c, electronic components 31 disposed on the circuit board 30 are covered by protrusions 631c. That is, at least one electronic component 31 disposed on the circuit board 30 is covered by protrusions 631c. By covering the relatively tall electronic components 31 with protrusions 631c, the second resin portion 62 can be made thinner, the amount of resin used in the resin portion 60 can be reduced, and miniaturization and weight reduction of the motor 100c can be achieved.

[0079] like Figure 11 As shown, the electronic component 31 can also be covered by the annular portion 633d of the third resin portion 63d of the motor 100d. That is, at least one of the electronic components 31 disposed on the circuit board 30 is covered by the annular portion 633d. By covering the relatively tall electronic component 31 with the annular portion 633d, the second resin portion 62 can be made thinner, the amount of resin used in the resin portion 60 can be reduced, and miniaturization and weight reduction of the motor 100d can be achieved.

[0080] The embodiments of the present invention have been described above, but various modifications can be made to the embodiments as long as they are within the scope of the spirit of the present invention.

[0081] According to the present invention, for example, it can be used in motors and air supply devices including motors.

Claims

1. A motor having: A rotor configured to rotate about a central axis extending in the vertical direction; A stator, which is disposed radially inside the rotor and is radially opposite the rotor; A circuit board, the circuit board being disposed axially below the stator; and A resin portion, which at least covers a portion of the stator and the circuit board, The stator has: The stator core has a plurality of pole teeth extending radially outward; A coil, which is formed by winding a wire around the pole teeth; as well as A conductive pin, which protrudes axially downwards from the lower part of the stator core, is electrically connected to the wire and to the coil and the circuit board. Its characteristics are, The resin portion has: A first resin portion, which covers at least both ends of the stator core in the axial direction and the coil; A second resin portion covers the circuit board; as well as A third resin portion is axially disposed between the first resin portion and the second resin portion and covers the conductive pin. At least the portion of the outer peripheral surface of the third resin portion that intersects with the extension line extending from the central axis toward the conductive pin is configured to be radially outerer than the radial outermost part of the first resin portion. The rotor has a rotor magnet. The third resin portion has a plurality of protrusions configured to be radially outer of the conductive pin and radially overlapping the conductive pin. The plurality of protrusions are arranged circumferentially, and at least the portion of the outer circumferential surface intersecting the extension line extending from the central axis toward the conductive pin is configured to be further outward than the radial outer edge of the first resin portion. The radial outer peripheral surface of the third resin section overlaps with the rotor magnet in the axial direction.

2. The motor according to claim 1, characterized in that, At least a portion of the third resin portion overlaps axially with at least a portion of the lower surface of the rotor.

3. The motor according to claim 1, characterized in that, At least one of the electronic components disposed on the circuit board is covered by the protrusion.

4. The motor according to claim 1 or 2, characterized in that, The third resin portion has an annular portion. The annular portion is arranged radially outward from the first resin portion throughout the entire circumference.

5. The motor according to claim 4, characterized in that, At least one of the electronic components disposed on the circuit board is covered by the annular portion.

6. The motor according to any one of claims 1 to 3, characterized in that, The first resin portion, the second resin portion, and the third resin portion are formed from a single component.

7. The motor according to any one of claims 1 to 3, characterized in that, The stator has an insulator disposed between the pole teeth and the coil and has insulating properties. The insulator has a conductive pin holding portion with an opening at its lower end that accommodates the conductive pin. A portion of the insulator is covered by a first resin portion, and at least the lower end of the conductive pin retaining portion is covered by the third resin portion.

8. An air supply device, characterized in that, have: The motor according to any one of claims 1 to 7; and An impeller, which is mounted on the rotor.

9. The air supply device according to claim 8, characterized in that, The impeller has: Multiple blades; and A cylindrical mounting portion that fixes the blades to the rotor. The third resin portion is configured to be radially inward than the mounting portion.

10. The air supply device according to claim 8 or 9, characterized in that, The upper end of the third resin section is positioned axially downwards from the lower end of the impeller.

11. The air supply device according to claim 8 or 9, characterized in that, The upper end of the third resin section is positioned axially above the lower end of the impeller.

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