Motor

Abstract

A motor according to the present invention comprises: a rotor having a rotary shaft; a stator that generates a magnetic force that acts on the rotor; a bracket in which is formed an insertion hole into which the rotary shaft is inserted; a connection member connected to the bracket; and an ingress prevention member that is disposed so as to be spaced apart from the connection member in the longitudinal direction of the rotary shaft and is fixed to the rotary shaft. The connection member has a first cylindrical part that surrounds the rotary shaft and protrudes toward the ingress prevention member from a facing surface facing the ingress prevention member, and the ingress prevention member has a second cylindrical part that surrounds the first cylindrical part.

Description

Motor

[0001] The present disclosure relates to a motor.

[0002] Motors are used in various products such as household electrical appliances and industrial electrical equipment. For example, motors are used in air conditioners. Motors used in air conditioners are mounted on the outdoor units and indoor units of air conditioners. In this case, the motor is mounted in an orientation where the rotating shaft is parallel to the horizontal direction.

[0003] The outdoor unit of an air conditioner is installed outdoors. For this reason, rainwater may enter the interior of the outdoor unit. The indoor unit of an air conditioner is provided with a heat exchanger. Therefore, water may be generated inside the indoor unit due to condensation formed by the heat exchanger. As described above, water may enter or be generated inside both the outdoor unit and the indoor unit of an air conditioner. For this reason, motors used in air conditioners adopt a waterproof structure (see, for example, Patent Document 1).

[0004] FIG. 15 is a cross-sectional view of a motor 1X disclosed in Patent Document 1. As shown in FIG. 15, the motor 1X disclosed in Patent Document 1 includes a casing 90X, a stator 10X and a rotor 20X housed inside the casing 90X. The casing 90X is divided into two left and right parts: a first casing part 91X and a second casing part 92X. An O-ring 93X is inserted into the uneven portion that is the mating surface between the first casing part 91X and the second casing part 92X.

[0005] In recent years, motors have been required to meet higher waterproof standards. For example, it is required that water does not penetrate into the interior of the motor even when the motor is installed with the rotating shaft inclined relative to the horizontal direction. Specifically, as for the waterproof performance of the motor, according to the Ingress Protection (IP) standard that indicates the dust-proof and waterproof performance of electronic equipment, the IPX2 waterproof grade, which specifies protection against dripping water when the rotating shaft is inclined 15° relative to the horizontal direction, is required.

[0006] Figure 16 shows the motor 1X disclosed in Patent Document 1 when it is installed in an inclined position. In the motor 1X disclosed in Patent Document 1, as shown in Figure 16, if the rotating shaft 21X is installed in an inclined position relative to the horizontal direction, water adhering to the rotating shaft 21X may seep into the inside of the motor 1X via the rotating shaft 21X. If water enters the inside of the motor 1X, the internal components of the motor 1X will deteriorate. For example, if water enters the inside of the motor 1X, the bearings will deteriorate.

[0007] Japanese Patent Application Publication No. 10-304640

[0008] This disclosure was made to solve such problems. The purpose of this disclosure is to provide a motor that can prevent water from entering the interior even when installed in an inclined position.

[0009] To achieve the above objective, one embodiment of the motor according to the present disclosure comprises a rotor having a rotating shaft, a stator that generates a magnetic force acting on the rotor, a bracket having a through hole through which the rotating shaft is inserted, a connecting member connected to the bracket, and an intrusion prevention member that is positioned with a gap between itself and the connecting member in the longitudinal direction of the rotating shaft and fixed to the rotating shaft, wherein the connecting member has a cylindrical first cylindrical portion that protrudes toward the intrusion prevention member from a surface facing the intrusion prevention member and surrounds the rotating shaft, and the intrusion prevention member has a cylindrical second cylindrical portion that surrounds the first cylindrical portion.

[0010] The connecting member may be a vibration-damping ring attached to the bracket.

[0011] The vibration-damping ring comprises an annular elastic body surrounding the rotating shaft and a metal ring provided along the outer circumferential surface of the elastic body, and the first cylindrical portion may be part of the elastic body.

[0012] The vibration-damping ring comprises an annular elastic body surrounding the rotating shaft, a metal ring provided along the outer circumferential surface of the elastic body, and an end plate provided along the inner circumferential surface of the elastic body, wherein the first cylindrical portion may be part of the end plate.

[0013] Preferably, the bracket has a projection that protrudes outward in the longitudinal direction of the rotating shaft, a bearing that supports the rotating shaft is housed inside the projection, and the vibration-damping ring is attached to the projection.

[0014] Preferably, the stator is covered by a molded resin, and the bracket is fixed to the molded resin.

[0015] The aforementioned connecting member may be a member to which a vibration-damping ring is attached.

[0016] The stator is covered by a molded resin, the bracket is fixed to the molded resin, and the connecting member may be part of the molded resin.

[0017] The connecting member may also be a mounting member to which a vibration-damping ring is attached.

[0018] The bracket is made of a metal material and has a projection that protrudes outward in the longitudinal direction of the rotating shaft, and a bearing that supports the rotating shaft is housed inside the projection, and the mounting member is fixed to the bracket at a location other than the projection, and the mounting member has a cover that covers the projection, and there may be a gap between the inner surface of the cover and the outer surface of the projection.

[0019] A buffer member may be provided in the gap.

[0020] Preferably, each of the bracket, the vibration-damping ring, and the anti-vibration member is provided in a pair so as to sandwich the stator in the longitudinal direction of the rotation shaft.

[0021] The outer diameter of the first cylindrical portion may gradually increase toward the intrusion prevention member.

[0022] The inner diameter of the first cylindrical portion may gradually increase toward the anti-vibration member.

[0023] In a cross-sectional view, if the angle between the outer surface of the first cylindrical portion and the axis of the rotation shaft is θ1, and the angle between the inner surface of the first cylindrical portion and the axis of the rotation shaft is θ2, then it is even preferable that 15° ≤ θ1 and 15° ≤ θ2.

[0024] It is preferable that 30° ≤ θ1 and 30° ≤ θ2.

[0025] It is preferable that θ1 ≤ 45° and θ2 ≤ 45°.

[0026] If R is the radius of curvature at the bottom of the groove formed by the opposing surface and the outer circumferential surface of the first cylindrical portion, then 0.05 mm ≤ R ≤ 2 mm may be used.

[0027] The aforementioned intrusion prevention member is preferably made of rubber.

[0028] Preferably, the motor is configured to be installed in a position where the rotating shaft extends substantially horizontally. According to this disclosure, even if the rotating shaft is installed in a position inclined with respect to the horizontal, it is possible to prevent water from entering the inside of the motor.

[0029] Figure 1 is a half-cross-sectional view of a motor according to Embodiment 1. Figure 2 is a half-cross-sectional view of a vibration-damping ring in a motor according to Embodiment 1. Figure 3 is an enlarged cross-sectional view showing a part of a motor according to Embodiment 1. Figure 4 is a side view of a motor mounted on a support base. Figure 5 is a perspective view of a motor mounted on a support base. Figure 6 is an enlarged cross-sectional view of a motor according to Embodiment 1 installed in a position where the rotation axis extends substantially horizontally. Figure 7 is an enlarged cross-sectional view of a motor according to Embodiment 1 installed in a position where the rotation axis is tilted 15° from the horizontal direction. Figure 8 is an enlarged cross-sectional view showing a part of a modified version of a motor according to Embodiment 1. Figure 9 is a half-cross-sectional view of a motor according to Embodiment 2. Figure 10 is a half-cross-sectional view of a vibration-damping ring in a motor according to Embodiment 2. Figure 11 is a cross-sectional view of a motor according to Embodiment 3. Figure 12 is an exploded perspective view of the molded resin, vibration-damping ring, and water-sealing rubber in a motor according to Embodiment 3. Figure 13 is an exploded perspective view of the second bracket, mounting member, vibration-damping ring, and water-sealing rubber in a motor according to Embodiment 3. Figure 14 is an enlarged cross-sectional view showing a part of a modified version of a motor according to Embodiment 3. Figure 15 is a cross-sectional view of the motor disclosed in Patent Document 1. Figure 16 is a diagram showing the state when the motor disclosed in Patent Document 1 is installed in an inclined position.

[0030] The embodiments of this disclosure will be described below with reference to the drawings. The embodiments described below are all specific examples of this disclosure. Therefore, the numerical values, shapes, materials, components, arrangement positions of components, and connection configurations shown in the following embodiments are examples and are not intended to limit this disclosure. Accordingly, among the components in the following embodiments, those components that are not described in the independent claims representing the highest-level concepts of this disclosure will be described as optional components.

[0031] Each figure is a schematic diagram and not necessarily a strictly accurate representation. Therefore, the scale and other aspects may not necessarily be consistent across all figures. Throughout all figures, substantially identical components are given the same reference numerals, and redundant explanations are omitted or simplified.

[0032] In this specification, the terms "up" and "down" do not necessarily refer to the upward (vertically upward) and downward (vertically downward) directions in absolute spatial perception. In this embodiment, for convenience, the direction in which the axis C of the rotation shaft 21 extends is defined as the left-right direction. However, this left-right direction may differ from the actual left-right direction depending on the operating conditions of the motor 1. In this embodiment, the radial direction of the stator 10 and rotor 20 is defined as the "radial direction," and the rotation direction of the rotor 20 is defined as the "circumferential direction." That is, the direction perpendicular to the axis C of the rotation shaft 21 that the rotor 20 has as its center is the "radial direction," and the direction that circles around the axis C of the rotation shaft 21 as its center is the "circumferential direction." The direction in which the axis C of the rotation shaft 21 extends (the longitudinal direction of the rotation shaft 21) is the "axial direction."

[0033] (Embodiment 1) The configuration of the motor 1 according to Embodiment 1 will be described with reference to Figure 1. Figure 1 is a half cross-sectional view of the motor 1 according to Embodiment 1. In Figure 1, only the parts that are visible in the cross-section are shown.

[0034] As shown in Figure 1, the motor 1 comprises a stator 10, a rotor 20 positioned opposite the stator 10, a first bearing 31 and a second bearing 32, a first bracket 41 and a second bracket 42, a vibration-damping ring 50 which is a connecting member, and a water-sealing rubber 60 which is an anti-corrosion member.

[0035] Motor 1 is a molded motor in which the stator 10 is covered with molded resin 70. Furthermore, Motor 1 is a brushless motor that does not use brushes.

[0036] The stator 10 is positioned opposite the rotor 20 with a small air gap between them. The stator 10 is positioned to surround the rotor core 22 of the rotor 20. In other words, the motor 1 is an inner rotor type motor in which the rotor 20 is positioned inside the stator 10.

[0037] The stator 10 generates a magnetic force that acts on the rotor 20. Specifically, the stator 10 is configured to generate alternating north and south poles in the circumferential direction on the air gap surface between the rotor 20 and the rotor core 22. The stator 10, together with the rotor 20, constitutes a magnetic circuit. In this embodiment, the stator 10 has a stator core 11, windings 12, and an insulator 13.

[0038] The stator core 11 of the stator 10 generates a magnetic force to rotate the rotor 20. The stator core 11 is, for example, a laminate in which multiple steel plates are stacked along the direction in which the axis C of the rotating shaft 21 extends. Each of the multiple steel plates is a magnetic material. Each of the multiple steel plates is, for example, a punched electrical steel plate formed into a predetermined shape. The multiple steel plates are fixed to each other by, for example, crimping or welding. The stator core 11 is not limited to a laminate of multiple steel plates, but may also be a bulk body made of magnetic material.

[0039] The stator core 11 has a plurality of teeth that protrude toward the rotor 20. The plurality of teeth are arranged to protrude toward the axis C of the rotation axis 21 of the rotor 20. The plurality of teeth are arranged at equal intervals in the circumferential direction, with slots forming between any two adjacent teeth. The plurality of teeth extend radially in a direction perpendicular to the axis C of the rotation axis 21 (radial direction).

[0040] The winding 12 is the armature winding of the stator 10. The winding 12 is a winding coil wound around the stator core 11 as a stator coil. The winding 12 is wound around each of the multiple teeth via the insulator 13. In other words, multiple windings 12 are wound around the stator 10. In this embodiment, each winding 12 is a concentrated winding coil wound around the corresponding tooth. Each winding 12 is housed in a slot in the stator core 11.

[0041] When the windings 12 are energized, a magnetic field is generated from each of the multiple teeth of the stator core 11. The multiple windings 12 are provided as three-phase windings to drive a three-phase synchronous motor. In other words, the motor 1 in this embodiment is an embedded magnet synchronous motor (IPMSM; Interior Permanent Magnet Synchronous Motor). In this case, the multiple windings 12 are composed of unit coils for the U-phase, V-phase, and W-phase, each of which is electrically 120 degrees out of phase with respect to the others. That is, the windings 12 attached to each tooth are energized and driven by three-phase alternating current, which is energized for each of the U-phase, V-phase, and W-phase. As a result, the main magnetic flux of the stator 10 is generated in each tooth.

[0042] The stator 10 is a molded stator covered with molded resin 70. For example, the stator 10 covered with molded resin 70 can be formed by injection molding. The molded resin 70 is a stator mold that covers at least a part of the stator 10. In this embodiment, the molded resin 70 covers the outer portion of the stator 10 over its entire circumference in the circumferential direction. Specifically, the molded resin 70 covers the outer portions of the stator core 11 and the windings 12. The molded resin 70 constitutes a housing that encloses the rotor 20. The molded resin 70 is molded into a cylindrical shape with openings at both ends in the direction in which the rotating shaft 21 extends. The molded resin 70 constitutes the outer shell of the motor 1.

[0043] The molding resin 70 is made of an insulating resin material with excellent thermal conductivity, such as polyester resin or epoxy resin. The molding resin 70 is made of a thermosetting resin. In this embodiment, the molding resin 70 is made of unsaturated polyester (Bulk Molding Compound (BMC)), which is a thermosetting resin.

[0044] The molding resin 70 houses a circuit board 80 to which the windings 12 of the stator 10 are connected. The circuit board 80 is disposed opposite to the second bracket 42. The circuit board 80 is a mounting board on which a plurality of circuit elements for driving the motor 1 are mounted. The ends of the windings 12 of each phase are connected at the winding connection portion of the circuit board 80. For example, patterned wiring for electrically connecting a plurality of windings 12 for each of the U-phase, V-phase, and W-phase is formed on the circuit board 80. The ends of the windings 12 of each phase are electrically connected to the patterned wiring of the circuit board 80 by soldering or the like.

[0045] The rotor 20 rotates by magnetic force generated in the stator 10. Specifically, the rotor 20 has a rotating shaft 21. The rotor 20 rotates about the axis C of the rotating shaft 21 as its rotation center.

[0046] The rotor 20 generates magnetic force that acts on the stator 10. The rotor 20 has a configuration in which a plurality of N poles and S poles serving as main magnetic flux are repeatedly arranged along the circumferential direction. In the present embodiment, the direction of the main magnetic flux generated by the rotor 20 is a direction (radial direction) perpendicular to the direction in which the axis C of the rotating shaft 21 extends.

[0047] The rotor 20 is disposed with the stator 10 via an air gap. The rotor 20 includes a rotor core 22 through which the rotating shaft 21 is inserted, and a plurality of permanent magnets 23 held by the rotor core 22. The rotor 20 in the present embodiment is an IPM (Interior Permanent Magnet) rotor in which the permanent magnets 23 are embedded in the rotor core 22. Therefore, the motor 1 in the present embodiment is an embedded permanent magnet IPM motor.

[0048] The rotating shaft 21 has a central axis C that serves as the center when the rotor 20 rotates. The rotating shaft 21 extends in the direction in which the central axis C extends, which is the longitudinal direction of the rotating shaft 21. The rotating shaft 21 is an elongated shaft. In the present embodiment, the rotating shaft 21 is a metal bar made of a metal material such as SUS (Steel Use Stainless). The rotating shaft 21 is fixed to the center of the rotor core 22. Specifically, the rotating shaft 21 penetrates through the rotor core 22. The rotating shaft 21 is fixed to the rotor core 22 so as to extend to both sides of the rotor core 22 in the direction in which the central axis C extends. The rotating shaft 21 is fixed to the rotor core 22, for example, by press-fitting or shrink-fitting into the center hole of the rotor core 22.

[0049] The rotating shaft 21 includes a first end 21a which is one end in the direction in which the rotating shaft 21 extends, and a second end 21b which is the other end in the direction in which the rotating shaft 21 extends. The second end 21b is an end on the opposite side from the first end 21a. Both ends of the rotating shaft 21, namely the first end 21a and the second end 21b, protrude to the outside of the motor 1. Specifically, the first end 21a of the rotating shaft 21 protrudes outward from the through hole of the first bracket 41. The second end 21b of the rotating shaft 21 protrudes outward from the through hole of the second bracket 42. Each of the portions of the rotating shaft 21 protruding from the first bracket 41 and the second bracket 42 can be used as an output shaft of the rotating shaft 21. A load such as a rotating fan is attached to the output shaft of the rotating shaft 21.

[0050] The rotating shaft 21 is supported by a first bearing 31 and a second bearing 32. The first bearing 31 and the second bearing 32, as a pair of bearings, rotatably support the rotating shaft 21. The first bearing 31 supports the portion of the rotating shaft 21 on the first end 21a side. The second bearing 32 supports the portion of the rotating shaft 21 on the second end 21b side. In this way, the rotating shaft 21 is held by the first bearing 31 and the second bearing 32 in a rotatable state. The first bearing 31 and the second bearing 32 are bearings having an inner ring and an outer ring. As an example, the first bearing 31 and the second bearing 32 are ball bearings. The first bearing 31 and the second bearing 32 are not limited to ball bearings. The first bearing 31 and the second bearing 32 may be other bearings such as roller bearings.

[0051] The first end 21a of the rotating shaft 21 passes through the first bearing 31. The first end 21a of the rotating shaft 21 protrudes outward from the first bearing 31. The second end 21b of the rotating shaft 21 passes through the second bearing 32. The second end 21b of the rotating shaft 21 protrudes outward from the second bearing 32.

[0052] The rotor core 22 is positioned with respect to the stator core 11 of the stator 10 via an air gap. The rotor core 22 is a substantially cylindrical laminate in which multiple steel plates are stacked in the direction in which the axis C of the rotation shaft 21 extends. Each of the multiple steel plates is a magnetic material. Each of the multiple steel plates is, for example, a punched electrical steel sheet formed into a predetermined shape. The multiple steel plates are fixed to each other, for example, by riveting or welding.

[0053] The rotor core 22 has a plurality of magnet insertion holes 22a that penetrate along the direction in which the axis C of the rotating shaft 21 extends. When viewed from the direction in which the axis C of the rotating shaft 21 extends, the plurality of magnet insertion holes 22a are formed at equal intervals in the circumferential direction. One permanent magnet 23 is inserted into each magnet insertion hole 22a. The permanent magnet 23 is, for example, a substantially rectangular parallelepiped.

[0054] The permanent magnet 23 is, for example, a ferrite magnet made of a sintered ferrite magnet. However, the permanent magnet 23 is not limited to a ferrite magnet. For example, the permanent magnet 23 may be a rare earth magnet.

[0055] The first bracket 41 holds the first bearing 31. The first bearing 31 is fixed to the first bracket 41 inside the first bracket 41.

[0056] The second bracket 42 holds the second bearing 32. The second bearing 32 is fixed to the second bracket 42 inside the second bracket 42.

[0057] The rotating shaft 21 is inserted through the first bracket 41 and the second bracket 42. Specifically, the first bracket 41 has a through hole 41a through which the rotating shaft 21 is inserted. The second bracket 42 has a through hole 42a through which the rotating shaft 21 is inserted. The rotating shaft 21 is not in contact with the through holes 41a and 42a. In other words, the rotating shaft 21 is loosely inserted through the through holes 41a and 42a.

[0058] The first bracket 41 has a projection 41b that protrudes outward in the longitudinal direction (direction of the axis C) of the rotating shaft 21. The insertion hole 41a is formed in the projection 41b. Specifically, the projection 41b is formed in a bottomed cylindrical shape so as to protrude toward the tip of the first end 21a of the rotating shaft 21. The projection 41b has a cylindrical portion and a bottom plate portion. The insertion hole 41a is formed in the bottom plate portion of the projection 41b. The main surface of the bottom plate portion of the projection 41b is perpendicular to the direction of the axis C of the rotating shaft 21. The first bearing 31 is housed inside the projection 41b. Specifically, the first bearing 31 is fitted and fixed in a recess formed by the projection 41b.

[0059] The second bracket 42 has a projection 42b that protrudes outward in the longitudinal direction of the rotating shaft 21. The insertion hole 42a is formed in the projection 42b. Specifically, the projection 42b is formed in a bottomed cylindrical shape so as to protrude toward the tip of the second end 21b of the rotating shaft 21. The projection 42b has a cylindrical portion and a bottom plate portion. The insertion hole 42a is formed in the bottom plate portion of the projection 42b. The main surface of the bottom plate portion of the projection 42b is perpendicular to the direction of the axis C of the rotating shaft 21. The second bearing 32 is housed inside the projection 42b. Specifically, the second bearing 32 is fitted and fixed in a recess formed by the projection 42b.

[0060] The first bracket 41 and the second bracket 42 are fixed to the molded resin 70. The first bracket 41 and the second bracket 42 are provided as a pair of brackets to sandwich the stator 10 in the longitudinal direction of the rotation shaft 21. Specifically, the first bracket 41 is provided to close one opening of the molded resin 70. The second bracket 42 is provided to close the other opening of the molded resin 70. The first bracket 41, the second bracket 42 and the molded resin 70 are outer shell components that constitute the outer shell of the motor 1.

[0061] The first bracket 41 and the second bracket 42 are metal parts made of a metal material such as an iron-based material. The first bracket 41 and the second bracket 42 are made of sheet metal formed from a metal material. The first bracket 41 and the second bracket 42 are made of a metal plate of a constant thickness. Specifically, the first bracket 41 and the second bracket 42 are formed into a predetermined shape by press working on a metal plate. In this embodiment, both the first bracket 41 and the second bracket 42 are made of steel plate. Note that the first bracket 41 and the second bracket 42 do not have to be made of the same metal material.

[0062] A vibration-damping ring 50, which is a connecting member, is connected to each of the first bracket 41 and the second bracket 42. In other words, the motor 1 is equipped with a pair of vibration-damping rings 50. One of the pair of vibration-damping rings 50 is the first vibration-damping ring 50a. The other of the pair of vibration-damping rings 50 is the second vibration-damping ring 50b. The pair of vibration-damping rings 50 (first vibration-damping ring 50a, second vibration-damping ring 50b) are provided so as to sandwich the stator 10 in the longitudinal direction of the rotating shaft 21.

[0063] The first vibration-damping ring 50a is an example of a connecting member connected to the first bracket 41. The first vibration-damping ring 50a is fixed to the first bracket 41. Specifically, the first vibration-damping ring 50a is attached to the first bracket 41 and is in contact with the first bracket 41. More specifically, the first vibration-damping ring 50a is attached to the protruding portion 41b of the first bracket 41. In this embodiment, the first vibration-damping ring 50a is fitted into and fixed to the cylindrical portion of the protruding portion 41b. For example, the first vibration-damping ring 50a can be fixed to the first bracket 41 by press-fitting it into the cylindrical portion of the protruding portion 41b. The first vibration-damping ring 50a may also be fixed to the first bracket 41 without being in contact with the first bracket 41.

[0064] The second vibration-damping ring 50b is an example of a connecting member connected to the second bracket 42. The second vibration-damping ring 50b is fixed to the second bracket 42. Specifically, the second vibration-damping ring 50b is attached to the second bracket 42 and is in contact with the second bracket 42. More specifically, the second vibration-damping ring 50b is attached to the protruding portion 42b of the second bracket 42. In this embodiment, the second vibration-damping ring 50b is fitted into the cylindrical portion of the protruding portion 42b and fixed. For example, the second vibration-damping ring 50b can be fixed to the second bracket 42 by press-fitting it into the cylindrical portion of the protruding portion 42b. The second vibration-damping ring 50b may also be fixed to the second bracket 42 without being in contact with the second bracket 42.

[0065] The vibration-damping ring 50 is a vibration-damping member that suppresses the transmission of vibrations generated in the motor 1 during its operation to the outside of the motor 1. The vibration-damping ring 50 is annular in shape. The vibration-damping ring 50 is configured to surround the rotating shaft 21. In this embodiment, the vibration-damping ring 50 is annular overall. The center of the vibration-damping ring 50 coincides with the axis C of the rotating shaft 21.

[0066] Here, the detailed configuration of the vibration isolation ring 50 will be explained with reference to Figure 1, and using Figures 2 and 3. Figure 2 is a half cross-sectional view of the vibration isolation ring 50 in the motor 1 according to Embodiment 1. Figure 3 is an enlarged cross-sectional view showing a part of the motor 1 according to Embodiment 1. Figure 3 shows the peripheral portions of the vibration isolation ring 50 and the water drain rubber 60.

[0067] As shown in Figures 2 and 3, the vibration isolation ring 50 has an elastic body 51, a metal ring 52, and an end plate 53.

[0068] The elastic body 51 is a rubber material having rubber elasticity. As the material for the elastic body 51, elastomer resin or silicone resin can be used. The elastic body 51 may also be composed of a material other than rubber. As an elastic body other than rubber, resin materials such as polybutylene terephthalate (PBT), foamed materials such as polystyrene foam, and compressed materials such as wood or paper can be used.

[0069] The elastic body 51 is an annular member surrounding the rotation axis 21. As shown in Figures 2 and 3, the elastic body 51 has a main body portion 51a, a flat plate portion 51b, and a cylindrical portion 51c. The main body portion 51a, the flat plate portion 51b, and the cylindrical portion 51c are integrally constructed. Therefore, each of the main body portion 51a, the flat plate portion 51b, and the cylindrical portion 51c is a part of the elastic body 51.

[0070] The main body portion 51a is an annular member having an opening 51a1. Specifically, the main body portion 51a is an annular shape (like a Baumkuchen) that is thin in thickness and wide in the radial direction. The opening 51a1 is provided in the center of the main body portion 51a. The vibration-damping ring 50, which is the first vibration-damping ring 50a, can be attached to the first bracket 41 by fitting the opening 51a1 of the elastic body 51 into the protrusion 41b of the first bracket 41. Specifically, the elastic body 51 is fitted into the first bracket 41 via the end plate 53. Similarly, the vibration-damping ring 50, which is the second vibration-damping ring 50b, can be attached to the second bracket 42 by fitting the opening 51a1 of the elastic body 51 into the protrusion 42b of the second bracket 42. Specifically, the elastic body 51 is fitted into the second bracket 42 via the end plate 53.

[0071] The flat plate portion 51b is an annular member having an opening 51b1. Therefore, the outer shape of the flat plate portion 51b is circular. The plan view shape of the opening 51b1 is circular. The flat plate portion 51b is an annular shape with width in the radial direction. Also, the flat plate portion 51b is flat, and its thickness is thinner than the thickness of the main body portion 51a.

[0072] The rotating shaft 21 is inserted through the opening 51b1 of the flat plate portion 51b. The flat plate portion 51b and the rotating shaft 21 are not in contact. There is a gap between the inner circumference end of the opening 51b1 of the flat plate portion 51b and the rotating shaft 21. In other words, the rotating shaft 21 is loosely passing through the opening 51b1 of the flat plate portion 51b.

[0073] The flat plate portion 51b is connected to the opposing surface 51a2 of the main body portion 51a that faces the drain rubber 60. Specifically, the flat plate portion 51b is formed to protrude in an overhang shape from the inner circumference end of the opening 51a1 of the main body portion 51a toward the rotation axis 21. In this embodiment, the opposing surface 51a2 of the main body portion 51a and the flat plate portion 51b are connected with a step. However, it is not limited to this. For example, the opposing surface 51a2 of the main body portion 51a and the opposing surface 51b2 of the flat plate portion 51b that faces the drain rubber 60 may be flush. Note that the opposing surface 51a2 of the main body portion 51a and the opposing surface 51b2 of the flat plate portion 51b are perpendicular to the direction of the axis C of the rotation axis 21.

[0074] The cylindrical portion 51c is a cylindrical member that surrounds the rotating shaft 21. The cylindrical portion 51c protrudes from the opposing surface 51b2 of the flat plate portion 51b toward the drain rubber 60. In this embodiment, the cylindrical portion 51c protrudes from the opening end of the opening 51b1 of the flat plate portion 51b. The rotating shaft 21 is inserted through the opening of the cylindrical portion 51c. The cylindrical portion 51c and the rotating shaft 21 are not in contact. There is a gap between the inner circumferential surface of the cylindrical portion 51c and the rotating shaft 21. In other words, the rotating shaft 21 is loosely inserted through the cylindrical portion 51c.

[0075] In cross-sectional view, the cylindrical portion 51c is inclined with respect to the longitudinal direction of the rotation axis 21. Specifically, the cylindrical portion 51c is inclined toward the water-sealing rubber 60, away from the rotation axis 21. In other words, in cross-sectional view, the cylindrical portion 51c is formed so as to fold outward from the flat plate portion 51b. For this reason, the groove 51d is formed by the flat plate portion 51b and the cylindrical portion 51c. Specifically, the groove 51d is formed by the opposing surface 51b2 of the flat plate portion 51b and the outer circumferential surface of the cylindrical portion 51c. Since the cylindrical portion 51c is inclined in cross-sectional view, the cross-sectional shape of the groove 51d is V-shaped. The groove 51d is formed around the entire circumference of the vibration-damping ring 50. The bottom of the groove 51d should preferably be arc-shaped. In this case, if the radius of curvature (angle radius) of the bottom of the groove 51d is R, it is preferable that 0.05 mm ≤ R ≤ 2 mm.

[0076] The inclination angle of the cylindrical portion 51c is not particularly limited. However, if θ1 is the angle between the outer surface of the cylindrical portion 51c and the axis C of the rotation axis 21 in a cross-sectional view, then it is preferable that θ1 be 15° ≤ θ1. It is even preferable that θ1 be 30° ≤ θ1. If θ2 is the angle between the inner surface of the cylindrical portion 51c and the axis C of the rotation axis 21, then it is preferable that θ2 be 15° ≤ θ2. It is even preferable that θ2 be 30° ≤ θ2. There are no particular upper limits on the angles θ1 and θ2. However, θ1 ≤ 45° and θ2 ≤ 45°.

[0077] In this embodiment, the cylindrical portion 51c is a cylindrical member composed of side walls of constant thickness. Therefore, angles θ1 and θ2 are the same (θ1 = θ2). The inner and outer diameters of the cylindrical portion 51c gradually increase toward the drain rubber 60. In other words, the opening diameter of the opening of the cylindrical portion 51c gradually increases toward the drain rubber 60. Specifically, the cylindrical portion 51c is a cylindrical member with an outer shape of a frustoconical shape. In other words, the cylindrical portion 51c is a skirt portion formed in a skirt shape. In this embodiment, θ1 = θ2 = 34°.

[0078] The metal ring 52 is provided along the outer circumferential surface of the elastic body 51. In other words, the metal ring 52 covers the outer circumferential surface of the elastic body 51. In this embodiment, the metal ring 52 is in contact with the outer circumferential surface of the elastic body 51. The metal ring 52 is the outer circumferential ring that forms the outer shell of the vibration-damping ring 50. The metal ring 52 and the elastic body 51 are joined in close contact. For example, the metal ring 52 and the elastic body 51 can be joined by vulcanization bonding.

[0079] The metal ring 52 is an annular ring. In this embodiment, the metal ring 52 is circular. For example, the metal ring 52 is made circular by curving a long, thin metal plate. The metal ring 52 is made of a metal material such as iron or aluminum.

[0080] The metal ring 52 has a divided portion 52a in which a part of the circumferential direction of the metal ring 52 is separated. In other words, the metal ring 52 is an annular shape in which a part of the circumferential direction is discontinuous. Due to the divided portion 52a, a gap exists in the circumferential direction of the metal ring 52. In other words, the divided portion 52a is a slit that forms an opening.

[0081] The metal ring 52 has grooves 52b formed around its entire circumference. The grooves 52b are formed by pressing the metal plate constituting the metal ring 52 to create a grooved surface.

[0082] The end plate 53 is a metal plate. The end plate 53 is made of a metal material such as iron or aluminum. In this embodiment, the end plate 53 is an iron plate. The end plate 53 is provided along the inner circumferential surface of the elastic body 51. Specifically, the end plate 53 is in contact with the inner circumferential surface of the elastic body 51. More specifically, the end plate 53 is formed along the inner circumferential surface of the opening 51a1 of the main body portion 51a of the elastic body 51 and the inner surface of the flat plate portion 51b. Therefore, the end plate 53 is formed to be substantially L-shaped in cross-sectional view. The end plate 53 has the same cross-sectional shape in the circumferential direction of the rotation axis 21. In this case, the end plate 53 is a cylindrical member with a step. Note that the end plate 53 does not have to have the same cross-sectional shape in the circumferential direction of the rotation axis 21.

[0083] As shown in Figure 1, a water-draining rubber 60 is provided adjacent to the vibration-damping ring 50. The water-draining rubber 60 is provided opposite to the vibration-damping ring 50. The water-draining rubber 60 is provided opposite to the first vibration-damping ring 50a and the second vibration-damping ring 50b, which are attached to the first bracket 41 and the second bracket 42, respectively. In other words, the motor 1 is equipped with a pair of water-draining rubbers 60. One of the pair of water-draining rubbers 60 is the first water-draining rubber 60a. The other of the pair of water-draining rubbers 60 is the second water-draining rubber 60b. The pair of water-draining rubbers 60 (first water-draining rubber 60a, second water-draining rubber 60b) is provided so as to sandwich the stator 10 in the longitudinal direction of the rotating shaft 21. Specifically, the pair of water-draining rubbers 60 is provided so as to sandwich the pair of vibration-damping rings 50.

[0084] The water-sealing rubber 60 is an example of an intrusion-proofing member. When the water-sealing rubber 60 functions as a waterproofing member, it prevents liquids such as water from entering the inside of the motor 1. As an intrusion-proofing member, the water-sealing rubber 60 also functions as a dustproofing member, and can also prevent foreign matter such as dust or powder from entering the inside of the motor 1.

[0085] The drain rubber 60 is an outer cover provided on the outside of the vibration-damping ring 50 in the longitudinal direction of the rotating shaft 21 (towards the tip of the rotating shaft 21). The drain rubber 60 does not come into contact with the vibration-damping ring 50. The drain rubber 60 is positioned with a gap between it and the vibration-damping ring 50 in the longitudinal direction of the rotating shaft 21.

[0086] As shown in Figure 3, the drain rubber 60 is fixed to the rotating shaft 21. Therefore, when the rotating shaft 21 rotates, the drain rubber 60 rotates together with the rotating shaft 21. In this embodiment, the drain rubber 60 has a through hole 61a through which the rotating shaft 21 passes. The drain rubber 60 is fixed to the rotating shaft 21 with the rotating shaft 21 passing through the through hole 61a. In this case, the drain rubber 60 and the rotating shaft 21 are in contact. For example, the rotating shaft 21 and the drain rubber 60 can be fixed by press-fitting the rotating shaft 21 into the through hole 61a. In this embodiment, a groove 21c is formed along the circumferential direction of the outer surface of the rotating shaft 21, and a part of the drain rubber 60 is inserted into this groove 21c. This allows the rotating shaft 21 and the drain rubber 60 to be firmly fixed together.

[0087] The water-squeegee rubber 60 may be fixed to the rotating shaft 21 without directly contacting it. For example, a bushing or the like may be inserted between the through hole 61a and the rotating shaft 21, and the water-squeegee rubber 60 and the rotating shaft 21 may be fixed together with a screw or the like. In this case as well, the water-squeegee rubber 60 will rotate together with the rotating shaft 21.

[0088] The drain rubber 60 is a rubber component made of rubber material. Therefore, the drain rubber 60 has rubber elasticity. As the rubber material that makes up the drain rubber 60, chloroprene rubber (CR), which has excellent rebound elasticity and aging resistance, or ethylene propylene rubber (EPDM), which has a low specific gravity and excellent heat resistance, cold resistance, and aging resistance, can be used.

[0089] As shown in Figure 3, the drain rubber 60 has a main body portion 61 and a cylindrical portion 62. The main body portion 61 and the cylindrical portion 62 are integrally constructed. Therefore, each of the main body portion 61 and the cylindrical portion 62 is a part of the drain rubber 60.

[0090] The main body portion 61 is the part of the drain rubber 60 that is fixed to the rotating shaft 21. The main body portion 61 has a through hole 61a through which the rotating shaft 21 passes. As described above, the main body portion 61 is in contact with the rotating shaft 21. The main body portion 61 is also press-fitted onto the rotating shaft 21. The main body portion 61 is formed to spread radially outward from the rotating shaft 21. The outer shape of the main body portion 61 is circular. However, it is not limited to this.

[0091] The cylindrical portion 62 is a cylindrical member that surrounds the rotating shaft 21. The cylindrical portion 62 protrudes from the main body portion 61 toward the vibration-damping ring 50. In this embodiment, the cylindrical portion 62 protrudes from the outer peripheral end of the main body portion 61. The rotating shaft 21 is inserted through the opening of the cylindrical portion 62. The cylindrical portion 62 and the rotating shaft 21 are not in contact, and a gap exists between the inner circumferential surface of the cylindrical portion 62 and the rotating shaft 21.

[0092] As shown in Figure 3, the cylindrical portion 62 surrounds the cylindrical portion 51c of the vibration-damping ring 50. Specifically, the cylindrical portion 62 covers the cylindrical portion 51c of the vibration-damping ring 50 from the outside. Therefore, in a direction perpendicular to the longitudinal direction of the rotation axis 21, the cylindrical portion 62 of the drain rubber 60 and the cylindrical portion 51c of the vibration-damping ring 50 overlap. In other words, in a direction perpendicular to the longitudinal direction of the rotation axis 21, the cylindrical portion 62 of the drain rubber 60 is located outside the cylindrical portion 51c of the vibration-damping ring 50.

[0093] In cross-sectional view, the cylindrical portion 62 is inclined with respect to the longitudinal direction of the rotation axis 21. Specifically, the cylindrical portion 62 is inclined toward the vibration damping ring 50, away from the rotation axis 21. The cylindrical portion 62 is a cylindrical member composed of side walls of constant thickness. Therefore, the inner and outer diameters of the cylindrical portion 62 gradually increase toward the vibration damping ring 50. In other words, the opening diameter of the opening of the cylindrical portion 62 gradually increases toward the vibration damping ring 50. Specifically, the cylindrical portion 62 is a cylindrical member with an outer shape of a frustoconical shape. In other words, the cylindrical portion 62 is a skirt-shaped portion.

[0094] The inclination angle of the cylindrical portion 62 of the drain rubber 60 is less steep than the inclination angle of the cylindrical portion 51c of the elastic body 51 in the vibration damping ring 50. The cylindrical portion 62 of the drain rubber 60 does not have to be inclined with respect to the rotation axis 21. Specifically, the cylindrical portion 62 may be parallel to the longitudinal direction of the rotation axis 21, and the inner and outer diameters of the cylindrical portion 62 may be constant.

[0095] Motor 1 configured in this way can be used, for example, as a fan motor mounted on the indoor or outdoor unit of an air conditioner. When motor 1 is used as a fan motor, a rotating fan (load fan) is attached to the rotating shaft 21 of motor 1 as a load.

[0096] When the motor 1 is installed in equipment such as the indoor unit of an air conditioner, the motor 1 is mounted on a support base 100, for example, as shown in Figures 4 and 5. Figure 4 is a side view of the motor 1 mounted on the support base 100. Figure 5 is a perspective view of the motor 1 mounted on the support base 100.

[0097] As shown in Figures 4 and 5, the motor 1 is installed in a position where the rotating shaft 21 extends substantially horizontally. In other words, the motor 1 is configured to be installed in a position where the rotating shaft 21 extends substantially horizontally. Specifically, both ends of the rotating shaft 21 of the motor 1 protrude outward. By supporting the parts of the motor 1 on both sides in the direction in which the rotating shaft 21 extends, the motor 1 can be installed in a position where the rotating shaft 21 extends substantially horizontally. Note that "substantially horizontal" means, for example, that the angle between the longitudinal direction of the rotating shaft 21 and the horizontal direction is within ±2°.

[0098] The motor 1 is supported on the support base 100 via vibration-damping rings 50. In this embodiment, two vibration-damping rings 50 are attached to the motor 1. Therefore, the motor 1 is fixed to the support base 100 via the two vibration-damping rings 50.

[0099] The support base 100 is a base for supporting the motor 1. The support base 100 is formed into a predetermined shape by, for example, press-forming a metal plate. In this embodiment, the support base 100 is bent so that its cross-sectional shape is U-shaped. The support base 100 has a bottom plate and a pair of side plates (support plates) erected from the ends of the bottom plate. The support base 100 is made of, for example, a steel plate. However, it is not limited to this.

[0100] As shown in Figures 4 and 5, the support base 100 has a motor receiving portion 110 as the part to which the motor 1 is attached. In this embodiment, the motor receiving portion 110 is a pair of side plates (support plates) of the support base 100. The vibration-damping ring 50 of the motor 1 is placed on the motor receiving portion 110. In this case, the motor receiving portion 110 is the edge of the metal plate that constitutes the support base 100. Specifically, the motor receiving portion 110 is an arc-shaped edge in which a part of the side plate of the support base 100 is cut out in an arc shape. When the motor 1 is set on the support base 100, the groove 52b of the metal ring 52 of the vibration-damping ring 50 of the motor 1 is fitted into the motor receiving portion 110.

[0101] The motor 1, on which the vibration-damping ring 50 is placed on the motor receiving portion 110 of the support base 100, is fixed to the support base 100 by tightening the vibration-damping ring 50 with the tightening member 200. Specifically, the metal ring 52 of the vibration-damping ring 50 is tightened by the tightening member 200, causing the elastic body 51 of the vibration-damping ring 50 to compress and deform. This allows the motor 1 to be fixed to the support base 100.

[0102] In this embodiment, the fastening member 200 is composed of a metal band 210 made of steel plate and a screw 220. In this case, the motor 1 can be fixed to the support base 100 as follows.

[0103] First, the motor 1 is set on the support base 100 so that the vibration damping ring 50 rests on the motor receiving portion 110. Specifically, the groove 52b of the metal ring 52 of the vibration damping ring 50 is fitted into the motor receiving portion 110 of the support base 100 to set the motor 1 on the support base 100. Next, the locking hole 211 of the metal band 210 is locked into the locking piece 120 of the support base 100, and the metal band 210 is placed over the vibration damping ring 50. After that, the metal band 210 is tightened with the screw 220. This tightens the metal ring 52 of the vibration damping ring 50 with the metal band 210. As a result, the metal ring 52 tightens the elastic body 51. In this way, the vibration damping ring 50 is compressed and fixed to the motor receiving portion 110. In this manner, the motor 1 can be fixed to the support base 100 via the vibration damping ring 50. Note that the screw 220 is a bolt or screw. If the screw 220 is a bolt, the metal band 210 can be tightened using the bolt and nut.

[0104] In this way, by fixing the motor 1 to the support base 100 via the vibration isolation ring 50, vibrations generated during the operation of the motor 1 can be suppressed by the vibration isolation ring 50. This prevents vibrations generated during the operation of the motor 1 from being transmitted to the outside of the motor 1.

[0105] Furthermore, in the motor 1 of this embodiment, a water-sealing rubber 60 is provided adjacent to the vibration-damping ring 50. The vibration-damping ring 50 and the water-sealing rubber 60 constitute a water-sealing structure (waterproof structure). In the motor 1 of this embodiment, this water-sealing structure prevents water from entering the inside of the motor 1. The waterproof effect of this motor 1 will be explained using Figures 6 and 7. Figures 6 and 7 are diagrams for explaining the waterproof effect of the motor 1 according to Embodiment 1. Figure 6 is an enlarged cross-sectional view of the motor 1 according to Embodiment 1, in which the rotating shaft 21 is installed in a position where it extends substantially horizontally. Figure 7 is an enlarged cross-sectional view of the motor 1 according to Embodiment 1, in which the rotating shaft 21 is installed in a position where it is tilted 15° with respect to the horizontal direction.

[0106] As shown in Figure 6, when water drips onto the vibration-damping ring 50, the water 2a that falls onto the vibration-damping ring 50 and falls towards the drain rubber 60 moves along the opposing surfaces 51a2 and 51b2 of the elastic body 51 towards the rotating shaft 21. This water 2a is temporarily caught in the groove 51d. In other words, the water is temporarily collected in the groove 51d. Therefore, the water 2a that falls onto the vibration-damping ring 50 does not fall onto the rotating shaft 21. The water 2a caught in the groove 51d moves along the circumferential direction of the vibration-damping ring 50 (the depth side or the front side in Figure 6) and falls downwards onto the vibration-damping ring 50 due to its own weight. This prevents the water 2a that falls onto the vibration-damping ring 50 from entering the inside of the motor 1.

[0107] When water drips onto the drain rubber 60, the water 2b falls onto the outer surface of the cylindrical portion 62 of the drain rubber 60. In this case, the water 2b that falls onto the drain rubber 60 moves along the outer surface of the cylindrical portion 62 in the circumferential direction of the vibration-damping ring 50 and falls downwards onto the drain rubber 60 due to its own weight.

[0108] At this time, even if the water 2b that falls onto the drain rubber 60 moves along the outer surface of the cylindrical portion 62 in the longitudinal direction of the rotating shaft 21, since the cylindrical portion 62 is inclined to widen toward the vibration-damping ring 50, the water 2b that falls onto the cylindrical portion 62 of the drain rubber 60 moves along the outer surface of the cylindrical portion 62 toward the opposite side from the vibration-damping ring 50 (right side in Figure 6), and falls onto the rotating shaft 21 via the outer surface of the main body portion 61 of the drain rubber 60. At this time, since there is no gap between the drain rubber 60 and the rotating shaft 21, the water 2c that falls onto the rotating shaft 21 does not move from the drain rubber 60 toward the vibration-damping ring 50 via the rotating shaft 21, but moves along the surface of the rotating shaft 21 in the circumferential direction of the rotating shaft 21 and falls downwards toward the rotating shaft 21 due to its own weight.

[0109] In particular, in this embodiment, the drain rubber 60 is press-fitted onto the rotating shaft 21. As a result, the drain rubber 60 and the rotating shaft 21 are in close contact without any gaps, which prevents water 2c that falls onto the rotating shaft 21 on the opposite side of the drain rubber 60 from the vibration damping ring 50 side (right side in Figure 6) from moving along the interface between the rotating shaft 21 and the drain rubber 60 towards the vibration damping ring 50 side.

[0110] In this way, it is possible to prevent water 2b that falls onto the drain rubber 60 and water 2c that falls onto the rotating shaft 21 from entering the inside of the motor 1.

[0111] Even if the water 2b that falls onto the outer surface of the cylindrical portion 62 of the drain rubber 60 moves towards the vibration-damping ring 50 side (left side in Figure 6) instead of the opposite side of the vibration-damping ring 50 side and enters the gap between the elastic body 51 of the vibration-damping ring 50 and the cylindrical portion 62 of the drain rubber 60, since the cylindrical portion 62 of the drain rubber 60 covers the cylindrical portion 51c of the vibration-damping ring 50 from the outside, the water 2b that enters the gap between the elastic body 51 of the vibration-damping ring 50 and the cylindrical portion 62 of the drain rubber 60 will be caught by the groove 51d of the vibration-damping ring 50 and will not fall onto the rotating shaft 21. The water 2b caught in the groove 51d will move along the circumferential direction of the vibration-damping ring 50 as described above and will fall downwards to the vibration-damping ring 50 due to its own weight.

[0112] When the rotating shaft 21 is rotating due to the drive of the motor 1, the water-squeegee rubber 60 is fixed to the rotating shaft 21, so the water-squeegee rubber 60 rotates together with the rotating shaft 21. Therefore, water 2b that falls onto the water-squeegee rubber 60 is repelled and blown away by the rotating water-squeegee rubber 60. At this time, since the cylindrical portion 62 is inclined to widen toward the vibration-damping ring 50, water 2b that falls onto the outer surface of the cylindrical portion 62 of the water-squeegee rubber 60 is repelled toward the opposite side from the vibration-damping ring 50 (right side in Figure 6), thus preventing water 2b from entering the gap between the water-squeegee rubber 60 and the vibration-damping ring 50.

[0113] The water 2b that is deflected to the opposite side of the vibration-damping ring 50 (right side in Figure 6) falls downwards on the rotating shaft 21. At this time, even if the water 2b deflected to the opposite side of the vibration-damping ring 50 (right side in Figure 6) falls onto the rotating shaft 21, as described above, there is no gap between the drain rubber 60 and the rotating shaft 21. Therefore, the water 2c that falls onto the rotating shaft 21 does not travel along the rotating shaft 21 from the drain rubber 60 to the vibration-damping ring 50 side, but moves along the surface of the rotating shaft 21 in the circumferential direction of the rotating shaft 21 and falls downwards on the rotating shaft 21 due to its own weight.

[0114] Even if water 2b that falls onto the outer surface of the cylindrical portion 62 of the drain rubber 60 is deflected by the rotating drain rubber 60 towards the vibration-damping ring 50 (left side in Figure 6) and enters the gap between the drain rubber 60 and the vibration-damping ring 50, as described above, the cylindrical portion 62 of the drain rubber 60 covers the cylindrical portion 51c of the vibration-damping ring 50 from the outside, so the water 2b that enters the gap between the drain rubber 60 and the vibration-damping ring 50 is caught by the groove 51d of the vibration-damping ring 50. As described above, the water 2b caught in the groove 51d moves along the circumferential direction of the vibration-damping ring 50 within the groove 51d and falls downwards to the vibration-damping ring 50 due to its own weight.

[0115] As described above, in the motor 1 according to this embodiment, the cylindrical portion 51c of the vibration damping ring 50 and the cylindrical portion 62 of the water-draining rubber 60 prevent water 2a that falls onto the vibration damping ring 50, water 2b that falls onto the water-draining rubber 60, and water 2c that falls onto the rotating shaft 21 from entering the inside of the motor 1. In other words, the cylindrical portion 51c of the vibration damping ring 50 and the cylindrical portion 62 of the water-draining rubber 60 have a water-draining structure. This provides a waterproof function that prevents water from entering the inside of the motor 1.

[0116] As shown in Figure 7, even when the motor 1 is installed in a position where the rotation axis 21 is inclined with respect to the horizontal direction, it is possible to prevent water from entering the inside of the motor 1.

[0117] Specifically, water 2a that falls onto the vibration-damping ring 50 is caught in the groove 51d as described above, and then falls downwards onto the vibration-damping ring 50 due to its own weight. Water 2b that falls onto the drain rubber 60 travels along the outer surface of the cylindrical portion 62 of the drain rubber 60 to either the vibration-damping ring 50 side (left side in Figure 6) or the opposite side (right side in Figure 6). Meanwhile, water 2b that moves towards the vibration-damping ring 50 enters the gap between the elastic body 51 of the vibration-damping ring 50 and the cylindrical portion 62 of the drain rubber 60, is caught in the groove 51d of the vibration-damping ring 50, and falls downwards onto the vibration-damping ring 50 due to its own weight. Water 2b that moves to the opposite side of the vibration-damping ring 50 falls onto the rotating shaft 21. Since there is no gap between the drain rubber 60 and the rotating shaft 21, water 2c that falls onto the rotating shaft 21 does not move towards the vibration-damping ring 50, but falls downwards onto the rotating shaft 21 due to its own weight.

[0118] When the water-squeegee rubber 60 rotates in conjunction with the rotation of the rotating shaft 21, the water 2b that falls onto the water-squeegee rubber 60 is repelled and blown away by the rotating water-squeegee rubber 60. In this case as well, as described above, the water 2b repelled by the water-squeegee rubber 60 falls below the rotating shaft 21, enters the gap between the elastic body 51 of the vibration-damping ring 50 and the cylindrical portion 62 of the water-squeegee rubber 60 and is caught by the groove 51d of the vibration-damping ring 50 and falls below the vibration-damping ring 50 by its own weight, or falls onto the rotating shaft 21 and then falls below the rotating shaft 21.

[0119] Thus, even when the motor 1 is installed with the rotation axis 21 tilted relative to the horizontal, the cylindrical portion 51c of the vibration damping ring 50 and the cylindrical portion 62 of the water-sealing rubber 60 perform their waterproofing functions. Therefore, it is possible to prevent water 2a that falls onto the vibration damping ring 50, water 2b that falls onto the water-sealing rubber 60, and water 2c that falls onto the rotation axis 21 from entering the inside of the motor 1.

[0120] As described above, the motor 1 is equipped with a vibration-damping ring 50 and a water-draining rubber 60, which are arranged with a gap between them, as shown in Figures 6 and 7. The vibration-damping ring 50 has a cylindrical portion 51c (first cylindrical portion). The water-draining rubber 60 has a cylindrical portion 62 (second cylindrical portion) that surrounds the cylindrical portion 51c of the vibration-damping ring 50. In other words, the cylindrical portion 51c of the vibration-damping ring 50 and the cylindrical portion 62 of the water-draining rubber 60 interlock with a gap between them, forming a labyrinth structure.

[0121] This configuration allows the cylindrical portion 51c of the vibration damping ring 50 and the cylindrical portion 62 of the water-sealing rubber 60 to perform a waterproofing function. This prevents water from entering the inside of the motor 1. In particular, even if the motor 1 is installed with the rotating shaft 21 tilted relative to the horizontal direction, water can be prevented from entering the inside of the motor 1. This prevents water from entering the inside of the motor 1 and causing deterioration of the internal components of the motor 1. For example, it prevents the deterioration of the first bearing 31 and the second bearing 32 due to water entering the inside of the motor 1. Moreover, since the vibration damping ring 50 and the water-sealing rubber 60 are positioned with a gap between them, it is also possible to prevent the rotating water-sealing rubber 60 from contacting the vibration damping ring 50 and generating abnormal noise.

[0122] Furthermore, according to the motor 1 of this embodiment, the water-sealing rubber 60 and the vibration-damping ring 50 not only prevent liquids such as water from entering the inside of the motor 1, but also prevent foreign matter such as dust or fine particles from entering the inside of the motor 1. In this regard, with the diversification of the uses of air conditioners, even indoor units are increasingly being used in environments where water droplets or dust are present. As a result, the risk of water droplets or dust entering the inside of the motor and causing it to malfunction is increasing. However, with the motor 1 of this embodiment, it is possible to prevent liquids such as water, or foreign matter such as dust or fine particles from entering the inside of the motor 1. As a result, it is possible to prevent liquids such as water, or foreign matter such as dust or fine particles from entering the inside of the motor 1 and causing it to malfunction.

[0123] Furthermore, in the motor 1 according to this embodiment, the vibration-damping ring 50 has an annular elastic body 51 surrounding the rotating shaft 21 and a metal ring 52 provided along the outer circumferential surface of the elastic body 51. The cylindrical portion 51c is a part of the elastic body 51.

[0124] This configuration allows the cylindrical portion 51c, which provides waterproofing or dustproofing, to be formed integrally with the elastic body 51. This helps to suppress the increase in cost that would result from adding the cylindrical portion 51c to the elastic body 51.

[0125] Furthermore, as shown in Figure 6, in the motor 1, the outer diameter of the cylindrical portion 51c of the vibration damping ring 50 gradually increases toward the drain rubber 60.

[0126] This configuration creates a V-shaped groove 51d in the flat plate portion 51b and cylindrical portion 51c of the elastic body 51. This allows water that seeps in through the gap between the vibration-damping ring 50 and the drain rubber 60 to be temporarily contained in the groove 51d before falling downwards to the motor 1. Therefore, water entering the inside of the motor 1 can be further suppressed.

[0127] In this embodiment, the radius of curvature R at the bottom of the groove 51d is 0.05 mm ≤ R ≤ 2 mm.

[0128] With this configuration, water caught in the groove 51d easily moves within the groove 51d along the circumferential direction of the vibration-damping ring 50 and easily falls downwards to the vibration-damping ring 50 due to its own weight. This prevents water from remaining in the groove 51d and overflowing from the groove 51d. Therefore, it is possible to prevent water that overflows from the groove 51d from falling onto the rotating shaft 21 and entering the inside of the motor 1 via the rotating shaft 21.

[0129] Furthermore, in the motor 1, the inner diameter of the cylindrical portion 51c of the vibration damping ring 50 gradually increases towards the water drain rubber 60.

[0130] With this configuration, the inner circumferential surface of the cylindrical portion 51c is inclined such that its inner diameter gradually increases towards the drain rubber 60. As a result, as shown in Figures 6 and 7, even if water 2d reaches the inner circumferential surface of the cylindrical portion 51c located below the rotating shaft 21, the water 2d will fall downward along the inner circumferential surface of the cylindrical portion 51c. In other words, it is possible to prevent water 2d that has reached the inner circumferential surface of the cylindrical portion 51c located below the rotating shaft 21 from entering the inside of the motor 1 by traveling along the inner circumferential surface of the cylindrical portion 51c.

[0131] In particular, in this embodiment, the angle θ2 between the inner circumferential surface of the cylindrical portion 51c and the axis of the rotating shaft 21 is 15° ≤ θ2.

[0132] As a result, even when the motor 1 is installed with the rotating shaft 21 tilted at 15° to the horizontal, as shown in Figure 7, the inclined state of the inner circumferential surface of the cylindrical portion 51c can be maintained. Therefore, even if water 2d gets into the inner circumferential surface of the cylindrical portion 51c located below the rotating shaft 21, the water 2d can be easily allowed to fall downward along the inner circumferential surface of the cylindrical portion 51c. This further suppresses water from entering the inside of the motor 1. Therefore, the motor 1 can meet the IPX2 waterproof rating in terms of its waterproof performance.

[0133] In this embodiment, the cylindrical portion 51c of the elastic body 51 of the vibration-damping ring 50 is configured to be inclined in cross-sectional view. However, it is not limited to this. Figure 8 is an enlarged cross-sectional view showing a part of a motor 1A according to a modified example of Embodiment 1. For example, as shown in Figure 8 of the motor 1A, the cylindrical portion 51cA of the elastic body 51A of the vibration-damping ring 50A does not have to be inclined with respect to the longitudinal direction (direction of the axis C) of the rotation axis 21 in cross-sectional view. In this modified example, the vibration-damping ring 50A does not have a flat plate portion 51b. The cylindrical portion 51cA protrudes from the main body portion 51a. In this modified example, as shown in Figure 8, it is preferable that a flange portion 51e is provided at the open end of the cylindrical portion 51cA. The flange portion 51e is formed in a flange shape so as to extend radially outward from the open end of the cylindrical portion 51cA. In other words, the flange portion 51e extends in a direction perpendicular to the longitudinal direction of the rotation axis 21. The flange portion 51e is formed around the entire circumference of the open end of the cylindrical portion 51cA. By providing the flange portion 51e at the open end of the cylindrical portion 51cA in this way, water can be easily received by the groove 51d even if the cylindrical portion 51cA is not inclined with respect to the longitudinal direction of the rotation axis 21.

[0134] (Embodiment 2) Next, the motor 1B according to Embodiment 2 will be described with reference to Figures 9 and 10. Figure 9 is a half cross-sectional view of the motor 1B according to Embodiment 2. Figure 10 is a half cross-sectional view of the vibration isolation ring 50B in the motor 1B according to Embodiment 2.

[0135] The motor 1B according to this embodiment differs from the motor 1 according to the first embodiment in the structure of the vibration-damping ring 50B. Specifically, in the first embodiment, the cylindrical portion 51c that performs the waterproofing function is part of the elastic body 51 of the vibration-damping ring 50. On the other hand, as shown in Figure 10, in this embodiment, the cylindrical portion 53c that performs the waterproofing function is part of the end plate 53B of the vibration-damping ring 50B. Therefore, the end plate 53B in this embodiment and the end plate 53 in the first embodiment have different structures.

[0136] Specifically, as shown in Figure 10, the end plate 53B has a main body portion 53a, a flat plate portion 53b, and a cylindrical portion 53c. The main body portion 53a, the flat plate portion 53b, and the cylindrical portion 53c are integrally formed and made of metal plate. The end plate 53B is made of iron plate.

[0137] The main body portion 53a of the end plate 53B has the same shape as the end plate 53 in the first embodiment described above. In other words, the end plate 53 in the first embodiment described above is composed only of the main body portion 53a of the end plate 53B in this embodiment.

[0138] The flat plate portion 53b of the end plate 53B is a flat, annular member with an opening. Therefore, the outer shape of the flat plate portion 53b is circular. The opening shape of the flat plate portion 53b is circular. The rotating shaft 21 is inserted through the opening of the flat plate portion 53b. The flat plate portion 53b and the rotating shaft 21 are not in contact. The flat plate portion 53b is connected to the main body portion 53a. Specifically, the flat plate portion 53b is formed to protrude from the main body portion 53a toward the rotating shaft 21 in an overhang shape. Therefore, the flat plate portion 53b and the main body portion 53a are connected in an L-shape in cross-section.

[0139] The cylindrical portion 53c is a cylindrical member that surrounds the rotating shaft 21. The cylindrical portion 53c protrudes toward the drain rubber 60 from the opposing surface 53b2 of the flat plate portion 53b that faces the drain rubber 60. In this embodiment, the cylindrical portion 53c protrudes from the opening end of the opening of the flat plate portion 53b. The rotating shaft 21 is inserted through the opening of the cylindrical portion 53c. The cylindrical portion 53c and the rotating shaft 21 are not in contact, and a gap exists between the inner circumferential surface of the cylindrical portion 53c and the rotating shaft 21. In other words, the rotating shaft 21 is loosely inserted through the cylindrical portion 53c.

[0140] In cross-sectional view, the cylindrical portion 53c is inclined with respect to the longitudinal direction of the rotation axis 21. Specifically, the cylindrical portion 53c is inclined toward the water-sealing rubber 60, away from the rotation axis 21. In other words, in cross-sectional view, the cylindrical portion 53c is formed so as to fold outward from the flat plate portion 53b. Therefore, the groove 53d is formed by the flat plate portion 53b and the cylindrical portion 53c. Specifically, the groove 53d is formed by the opposing surface 53b2 of the flat plate portion 53b and the outer circumferential surface of the cylindrical portion 53c. In cross-sectional view, since the cylindrical portion 53c is inclined with respect to the horizontal direction, the cross-sectional shape of the groove 53d is V-shaped. The groove 53d is formed around the entire circumference of the vibration-damping ring 50B. It is preferable that the bottom of the groove 53d be arc-shaped. In this case, if the radius of curvature (angle radius) of the bottom of the groove 53d is R, it is preferable that 0.05 mm ≤ R ≤ 2 mm.

[0141] The inclination angle of the cylindrical portion 53c is not particularly limited. However, if θ1 is the angle between the outer surface of the cylindrical portion 53c and the axis C of the rotation axis 21 in a cross-sectional view, then it is good that θ1 is 15° ≤ θ1, and even better that θ1 is 30° ≤ θ1. Also, if θ2 is the angle between the inner surface of the cylindrical portion 53c and the axis C of the rotation axis 21, then it is good that θ2 is 15° ≤ θ2, and even better that θ2 is 30° ≤ θ2. There are no particular upper limits on the angles θ1 and θ2. However, θ1 ≤ 45° and θ2 ≤ 45°.

[0142] In this embodiment, the cylindrical portion 53c is a cylindrical member composed of side walls of constant thickness. Therefore, angles θ1 and θ2 are the same (θ1 = θ2). The inner and outer diameters of the cylindrical portion 51c gradually increase toward the drain rubber 60. That is, the opening diameter of the opening of the cylindrical portion 53c gradually increases toward the drain rubber 60. Specifically, the cylindrical portion 53c is a cylindrical member with an outer shape of a frustoconical shape. That is, the cylindrical portion 53c is a skirt portion formed in a skirt shape. In this embodiment, θ1 = θ2 = 34°.

[0143] The vibration-damping ring 50B in this embodiment differs from the vibration-damping ring 50 in the first embodiment in terms of the structure of the elastic body 51B. Specifically, the elastic body 51B in this embodiment does not have a flat plate portion 51b and a cylindrical portion 51c compared to the elastic body 51 in the first embodiment. The elastic body 51B consists only of a main body portion 51a.

[0144] As described above, the motor 1B according to this embodiment, like the first embodiment described above, is equipped with a vibration-damping ring 50B and a water-draining rubber 60 arranged with a gap between them. The vibration-damping ring 50B has a cylindrical portion 53c (first cylindrical portion). The water-draining rubber 60 has a cylindrical portion 62 (second cylindrical portion) that surrounds the cylindrical portion 53c of the vibration-damping ring 50B. In other words, the cylindrical portion 53c of the vibration-damping ring 50B and the cylindrical portion 62 of the water-draining rubber 60 interlock with a gap between them, forming a labyrinth structure.

[0145] With this configuration, the cylindrical portion 53c of the vibration damping ring 50B and the cylindrical portion 62 of the water-draining rubber 60 have a water-draining structure, similar to the cylindrical portion 51c of the vibration damping ring 50 and the cylindrical portion 62 of the water-draining rubber 60 in the above embodiment 1. The cylindrical portion 53c of the vibration damping ring 50B and the cylindrical portion 62 of the water-draining rubber 60 perform the waterproofing function shown in Figures 6 and 7. This prevents water from entering the inside of the motor 1B. In particular, even if the motor 1B is installed in a position where the rotating shaft 21 is tilted with respect to the horizontal direction, water can be prevented from entering the inside of the motor 1B. This prevents water from entering the inside of the motor 1B and deteriorating the internal components of the motor 1B. For example, it prevents the deterioration of the first bearing 31 and the second bearing 32 due to water entering the inside of the motor 1B. Moreover, in this embodiment as well, the vibration damping ring 50B and the water-draining rubber 60 are arranged with a gap between them. This also helps to suppress the generation of abnormal noise caused by the rotating drain rubber 60 coming into contact with the vibration-damping ring 50B.

[0146] Furthermore, in the motor 1B according to this embodiment, similar to the first embodiment, the water-draining rubber 60 and the vibration-damping ring 50B not only prevent liquids such as water from entering the inside of the motor 1B, but also prevent foreign matter such as dust or powder from entering the inside of the motor 1B. Therefore, the motor 1B is also suitable for air conditioners and the like that are used in environments where water droplets or dust are present.

[0147] Furthermore, in the motor 1B according to this embodiment, the cylindrical portion 53c of the vibration damping ring 50B is part of the end plate 53B.

[0148] This configuration makes the cylindrical portion 53c, which performs the waterproofing function, less prone to deformation. As a result, the cylindrical portion 53c of the end plate 53B can provide a stable waterproofing function. Furthermore, by forming the cylindrical portion 53c, which performs the waterproofing function, integrally with the end plate 53B, it is possible to suppress the increase in cost that would otherwise be incurred by adding the cylindrical portion 53c to the end plate 53B.

[0149] Furthermore, in the motor 1B according to this embodiment, the outer diameter of the cylindrical portion 53c of the vibration-damping ring 50B gradually increases toward the drain rubber 60.

[0150] This configuration creates a V-shaped groove 53d in the flat portion 53b and cylindrical portion 53c of the end plate 53. This allows water that seeps in through the gap between the vibration damping ring 50B and the drain rubber 60 to be temporarily contained in the groove 53d before falling downwards to the motor 1B. Therefore, water entering the inside of the motor 1B can be further suppressed.

[0151] In this embodiment, the radius of curvature R at the bottom of the groove 53d is 0.05 mm ≤ R ≤ 2 mm.

[0152] With this configuration, the water received in the groove 53d easily moves within the groove 53d along the circumferential direction of the vibration-damping ring 50B and easily falls below the vibration-damping ring 50B due to its own weight. This prevents water from overflowing from the groove 53d. Therefore, it is possible to prevent water that overflows from the groove 53d from falling onto the rotating shaft 21 and entering the inside of the motor 1B.

[0153] Furthermore, in the motor 1B according to this embodiment, the inner diameter of the cylindrical portion 53c of the vibration-damping ring 50B gradually increases toward the drain rubber 60.

[0154] With this configuration, the inner circumferential surface of the cylindrical portion 53c is inclined such that its inner diameter gradually increases towards the drain rubber 60. As a result, even if water gets around to the inner circumferential surface of the cylindrical portion 53c located below the rotating shaft 21, the water will fall downward along the inner circumferential surface of the cylindrical portion 53c. In other words, it is possible to prevent water that gets around to the inner circumferential surface of the cylindrical portion 53c located below the rotating shaft 21 from entering the inside of the motor 1B by traveling along the inner circumferential surface of the cylindrical portion 53c.

[0155] In particular, in this embodiment, the angle θ2 between the inner circumferential surface of the cylindrical portion 53c and the axis of the rotating shaft 21 is 15° ≤ θ2.

[0156] As a result, even when the motor 1B is installed with the rotating shaft 21 tilted at 15° to the horizontal, the inclined state of the inner circumferential surface of the cylindrical portion 53c can be maintained. Therefore, even if water gets into the inner circumferential surface of the cylindrical portion 53c located below the rotating shaft 21, the water can be allowed to fall downward along the inner circumferential surface of the cylindrical portion 53c. This further suppresses water from entering the inside of the motor 1B. Therefore, in this embodiment as well, an IPX2 waterproof rating can be achieved for the motor 1B.

[0157] (Embodiment 3) Next, the motor 1C according to Embodiment 3 will be described with reference to Figures 11 to 13. Figure 11 is a cross-sectional view of the motor 1C according to Embodiment 3. Figure 12 is an exploded perspective view of the molded resin 70, the vibration damping ring 50C (first vibration damping ring 50a), and the water-sealing rubber 60 (first water-sealing rubber 60a) in the motor 1C according to Embodiment 3. Figure 13 is an exploded perspective view of the second bracket 42, the mounting member 90, the vibration damping ring 50C (second vibration damping ring 50b), and the water-sealing rubber 60 in the motor 1C according to Embodiment 3.

[0158] In the motor 1 according to the above embodiment 1, the connecting members connected to the first bracket 41 and the second bracket 42 are vibration-damping rings 50. As shown in Figure 11, in motor 1C, the connecting members connected to the first bracket 41 and the second bracket 42 are members to which vibration-damping rings 50C are attached.

[0159] The vibration isolation ring 50C, like the vibration isolation ring 50 in Embodiment 1, has an elastic body 51C and a metal ring 52. The elastic body 51C does not have a cylindrical portion 51c as in Embodiment 1. The motor 1C is equipped with a pair of vibration isolation rings 50C, namely a first vibration isolation ring 50a and a second vibration isolation ring 50b.

[0160] The connecting member connected to the first bracket 41 is the member to which the first vibration-damping ring 50a is attached. As shown in Figure 11, the connecting member connected to the first bracket 41 is part of the molded resin 70. As shown in Figures 11 and 12, the molded resin 70 has a projection 71 that protrudes outward from the end face of the molded resin 70 in the longitudinal direction of the rotation shaft 21. As shown in Figure 11, the first vibration-damping ring 50a is attached to the projection 71. The projection 71 is cylindrical and surrounds the rotation shaft 21.

[0161] The protruding portion 71 protrudes toward the first water-sealing rubber 60a from the opposing surface facing the first water-sealing rubber 60a and has a cylindrical portion 71a that surrounds the rotating shaft 21. The cylindrical portion 71a (first cylindrical portion) of the protruding portion 71 of the molded resin 70, which is a connecting member connected to the first bracket 41, is surrounded by the cylindrical portion 62 (second cylindrical portion) of the first water-sealing rubber 60a. In other words, the cylindrical portion 62 (second cylindrical portion) of the first water-sealing rubber 60a surrounds the cylindrical portion 71a (first cylindrical portion) of the molded resin 70.

[0162] As shown in Figure 11, the cylindrical portion 71a of the molded resin 70 is a cylindrical member that surrounds the rotating shaft 21. The rotating shaft 21 is inserted through the opening of the cylindrical portion 71a. The cylindrical portion 71a and the rotating shaft 21 are not in contact, and a gap exists between the inner circumferential surface of the cylindrical portion 71a and the rotating shaft 21. In other words, the rotating shaft 21 is loosely inserted into the cylindrical portion 71a.

[0163] In a cross-sectional view, the inner circumferential surface of the cylindrical portion 71a of the molded resin 70 is an inclined surface that is inclined with respect to the longitudinal direction of the rotation axis 21. Specifically, the inner circumferential surface of the cylindrical portion 71a is inclined toward the first drain rubber 60a in a direction away from the rotation axis 21.

[0164] The inclination angle of the inner circumferential surface of the cylindrical portion 71a is not particularly limited. However, if θ is the angle between the inner circumferential surface of the cylindrical portion 71a and the axis C of the rotation axis 21 in a cross-sectional view, then it is preferable that θ be 15° ≤ θ, and even better that θ be 30° ≤ θ. There is no particular upper limit to the angle θ. However, θ ≤ 45°.

[0165] The connecting member connected to the second bracket 42 is the member to which the second vibration-damping ring 50b is attached. As shown in Figure 11, in this embodiment, the connecting member connected to the second bracket 42 is the mounting member 90 to which the second vibration-damping ring 50b is attached.

[0166] The mounting member 90 is a mounting base for attaching the second vibration isolation ring 50b (vibration isolation ring 50C) to the motor 1C. Therefore, the second vibration isolation ring 50b is attached to the motor 1C via the mounting member 90. Specifically, since the mounting member 90 is fixed to the second bracket 42, the second vibration isolation ring 50b is fixed to the second bracket 42 via the mounting member 90.

[0167] As shown in Figures 11 and 13, the mounting member 90 has a mounting portion 91 to which the second vibration-damping ring 50b is attached, and a covering portion 92 that covers the protruding portion 42b of the second bracket 42.

[0168] As shown in Figure 11, the mounting portion 91 is cylindrical and surrounds the rotating shaft 21. The mounting portion 91 is a protruding portion formed so as to protrude outward from the covering portion 92 in the longitudinal direction of the rotating shaft 21. The second vibration-damping ring 50b is fitted into and fixed to the mounting portion 91. For example, the second vibration-damping ring 50b can be fixed to the mounting member 90 by press-fitting it into the mounting portion 91.

[0169] The mounting portion 91 has a cylindrical portion 91a that protrudes toward the second water-sealing rubber 60b from the opposing surface facing the second water-sealing rubber 60b and surrounds the rotating shaft 21. The cylindrical portion 91a (first cylindrical portion) of the mounting portion 91 of the mounting member 90, which is a connecting member connected to the second bracket 42, is surrounded by the cylindrical portion 62 (second cylindrical portion) of the second water-sealing rubber 60b. In other words, the cylindrical portion 62 (second cylindrical portion) of the second water-sealing rubber 60b surrounds the cylindrical portion 91a (first cylindrical portion) of the mounting member 90.

[0170] The cylindrical portion 91a of the mounting member 90 is a cylindrical member that surrounds the rotating shaft 21. The rotating shaft 21 is inserted through the opening of the cylindrical portion 91a. The cylindrical portion 91a and the rotating shaft 21 are not in contact, and a gap exists between the inner circumferential surface of the cylindrical portion 91a and the rotating shaft 21. In other words, the rotating shaft 21 is loosely inserted into the cylindrical portion 91a.

[0171] In a cross-sectional view, the inner circumferential surface of the cylindrical portion 91a of the mounting member 90 is an inclined surface that is inclined with respect to the longitudinal direction of the rotation axis 21. Specifically, the inner circumferential surface of the cylindrical portion 91a is inclined toward the second water-sealing rubber 60b in a direction away from the rotation axis 21.

[0172] The inclination angle of the inner circumferential surface of the cylindrical portion 91a is not particularly limited. However, if θ is the angle between the inner circumferential surface of the cylindrical portion 91a and the axis C of the rotation axis 21 in a cross-sectional view, then it is preferable that θ be 15° ≤ θ, and even better that θ be 30° ≤ θ. There is no particular upper limit to the angle θ, however, θ ≤ 45°.

[0173] As shown in Figure 11, a recess 92a is formed in the cover portion 92 that covers the protruding portion 42b of the second bracket 42. The protruding portion 42b of the second bracket 42 is housed in the recess 92a of the cover portion 92. The cover portion 92, like the mounting portion 91, is cylindrical and surrounds the rotating shaft 21. The inner surface of the cover portion 92 and the inner surface of the mounting portion 91 are formed in a stepped manner. The outer diameter of the cover portion 92 is larger than the outer diameter of the mounting portion 91.

[0174] The mounting member 90 is fixed to the second bracket 42 at locations other than the protruding portion 42b of the second bracket 42. Specifically, the mounting member 90 has a fixing portion 93 at the location where it is fixed to the second bracket 42. The fixing portion 93 is fixed to the flat plate portion 42c of the second bracket 42. The fixing portion 93 and the flat plate portion 42c of the second bracket 42 are in contact. As shown in Figures 11 and 13, the fixing portion 93 and the flat plate portion 42c of the second bracket 42 are fixed by screws 95. By fixing the fixing portion 93 to the second bracket 42, the mounting member 90 is fixed to the second bracket 42. The fixing portion 93 is provided on the cover portion 92. Specifically, the fixing portion 93 is formed to protrude radially outward from the outer peripheral end of the cover portion 92 on the second bracket 42 side. As shown in Figure 13, there are three fixing portions 93 provided on the cover portion 92.

[0175] As shown in Figure 11, a gap G exists between the inner surface of the cover portion 92 of the mounting member 90 (the inner surface of the recess 92a) and the outer surface of the protruding portion 42b of the second bracket 42. In other words, the inner surface of the cover portion 92 and the outer surface of the protruding portion 42b of the second bracket 42 are not in contact. The mounting member 90 is in contact with the second bracket 42 only at the fixing portion 93.

[0176] The gap G exists in an L-shape in cross-section. The gap G exists between the inner circumferential surface of the cover portion 92 of the mounting member 90 (the inner surface of the recess 92a) and the outer circumferential surface (outer surface) of the protruding portion 42b of the second bracket 42, as well as between the top surface of the cover portion 92 of the mounting member 90 (the bottom surface of the recess 92a) and the top surface of the protruding portion 42b of the second bracket 42. The gap G is an air layer.

[0177] The mounting member 90 configured in this way is made of a resin material. For example, the mounting member 90 is made of polybutylene terephthalate (PBT) or polyacetal (POM).

[0178] In this embodiment, the arrangement of the multiple permanent magnets 23 in the rotor 20 differs from that of Embodiment 1. Specifically, in Embodiment 1, the multiple permanent magnets 23 in the rotor 20 are arranged such that the main surface of each permanent magnet 23 is perpendicular to the radial direction. On the other hand, in this embodiment, the multiple permanent magnets 23 in the rotor 20 are arranged such that the main surface of each permanent magnet is parallel to the radial direction. In other words, in this embodiment, the multiple permanent magnets 23 are arranged in a spoke-like (radial) pattern around the rotation axis 21. Note that in this embodiment, the multiple permanent magnets 23 may be arranged in the same way as in Embodiment 1, or in Embodiment 1, the multiple permanent magnets 23 may be arranged in the same way as in this embodiment.

[0179] As described above, the motor 1C according to this embodiment comprises a molded resin 70 and a water-sealing rubber 60 arranged with a gap between them. A protruding portion 71, which is part of the molded resin 70, has a cylindrical portion 71a (first cylindrical portion). The water-sealing rubber 60 has a cylindrical portion 62 (second cylindrical portion) that surrounds the cylindrical portion 71a of the molded resin 70. In other words, the cylindrical portion 71a of the molded resin 70 and the cylindrical portion 62 of the water-sealing rubber 60 interlock with a gap between them, forming a labyrinth structure.

[0180] With this configuration, the cylindrical portion 71a of the molded resin 70 and the cylindrical portion 62 of the first water-sealing rubber 60a perform a waterproof function, similar to the cylindrical portion 51c of the vibration-damping ring 50 and the cylindrical portion 62 of the first water-sealing rubber 60a in the above embodiment 1. This prevents water from entering the inside of the motor 1C.

[0181] Furthermore, the motor 1C according to this embodiment includes a mounting member 90 and a second water-sealing rubber 60b arranged with a gap between them. The mounting member 90 has a cylindrical portion 91a (first cylindrical portion). The second water-sealing rubber 60b has a cylindrical portion 62 (second cylindrical portion) that surrounds the cylindrical portion 91a of the mounting member 90. In other words, the cylindrical portion 91a of the mounting member 90 and the cylindrical portion 62 of the water-sealing rubber 60 interlock with a gap between them, forming a labyrinth structure.

[0182] With this configuration, the cylindrical portion 91a of the mounting member 90 and the cylindrical portion 62 of the water-sealing rubber 60 perform a waterproofing function, similar to the cylindrical portion 51c of the vibration-damping ring 50 and the cylindrical portion 62 of the water-sealing rubber 60 in the above embodiment 1. This prevents water from entering the inside of the motor 1C.

[0183] Thus, in the motor 1C according to this embodiment, it is possible to suppress the ingress of water into the motor 1C and the deterioration of its internal components. In particular, even if the motor 1C is installed with the rotating shaft 21 tilted relative to the horizontal, it is possible to suppress the ingress of water into the motor 1C. Moreover, the molded resin 70 and the first water-sealing rubber 60a are arranged with a gap between them, and the mounting member 90 and the second water-sealing rubber 60b are also arranged with a gap between them. As a result, it is possible to suppress the generation of abnormal noise due to the rotating first water-sealing rubber 60a contacting the molded resin 70, and it is possible to suppress the generation of abnormal noise due to the rotating second water-sealing rubber 60b contacting the mounting member 90.

[0184] Furthermore, in the motor 1C according to this embodiment, the first water-sealing rubber 60a and the molded resin 70 not only prevent liquids such as water from entering the inside of the motor 1C, but also prevent foreign matter such as dust or fine particles from entering the inside of the motor 1C. In addition, the second water-sealing rubber 60b and the mounting member 90 not only prevent liquids such as water from entering the inside of the motor 1C, but also prevent foreign matter such as dust or fine particles from entering the inside of the motor 1C. Therefore, the motor 1C is suitable for air conditioners and the like used in environments where water droplets or dust are present.

[0185] Furthermore, in the motor 1C according to this embodiment, a gap G exists between the inner surface of the cover portion 92 of the mounting member 90 and the outer surface of the protruding portion 42b of the second bracket 42.

[0186] The second bearing 32 is housed inside the protruding portion 42b of the second bracket 42. Therefore, if the mounting member 90 and the protruding portion 42b of the second bracket 42 are in contact, the bearing noise of the second bearing 32 may be transmitted through the mounting member 90 and resonate, potentially generating noise. However, a gap G exists between the inner surface of the cover portion 92 of the mounting member 90 and the outer surface of the protruding portion 42b of the second bracket 42, so the mounting member 90 and the protruding portion 42b of the second bracket 42 are not in contact. Therefore, the resonant bearing noise of the second bearing 32 can be blocked by the gap G. This makes it possible to realize a low-noise motor 1C. Thus, in the motor 1C according to this embodiment, even if the mounting member 90 is used to attach the vibration-damping ring 50C, waterproof and dustproof effects, as well as soundproofing effects, can be obtained.

[0187] In this embodiment, the gap G between the inner surface of the cover portion 92 of the mounting member 90 and the outer surface of the protruding portion 42b of the second bracket 42 is an air layer. However, it is not limited to this. Specifically, a cushioning material such as sponge or rubber may be provided in the gap G. This effectively blocks the reflection of bearing noise from the second bearing 32. Therefore, the soundproofing effect can be enhanced.

[0188] The cylindrical portion 71a of the molded resin 70 may have the same shape as the cylindrical portion 51c of the vibration damping ring 50 in Embodiment 1. That is, the outer diameter of the cylindrical portion 71a of the molded resin 70 may gradually increase toward the first drain rubber 60a, and the inner diameter of the cylindrical portion 71a of the molded resin 70 may gradually increase toward the first drain rubber 60a. In this case, although not shown in the figures, if in a cross-sectional view the angle between the outer circumferential surface of the cylindrical portion 71a of the molded resin 70 and the axis of the rotation shaft 21 is θ1, and the angle between the inner circumferential surface of the cylindrical portion 71a of the molded resin 70 and the axis of the rotation shaft 21 is θ2, then it is preferable that 15°≦θ1 and 15°≦θ2. Furthermore, it is preferable that 30°≦θ1 and 30°≦θ2, and θ1≦45° and θ2≦45°. Furthermore, in the protruding portion 71 of the molded resin 70, if R is the radius of curvature at the bottom of the groove formed by the opposing surface facing the first drainage rubber 60a and the outer circumferential surface of the cylindrical portion 71a, then it is preferable that 0.05 mm ≤ R ≤ 2 mm.

[0189] Furthermore, the cylindrical portion 91a of the mounting member 90 may have the same shape as the cylindrical portion 51c of the vibration damping ring 50 in Embodiment 1. In other words, the outer diameter of the cylindrical portion 91a of the mounting member 90 may gradually increase toward the second water-sealing rubber 60b, and the inner diameter of the cylindrical portion 91a of the mounting member 90 may gradually increase toward the second water-sealing rubber 60b. In this case, although not shown in the figures, if in a cross-sectional view the angle between the outer circumferential surface of the cylindrical portion 91a of the mounting member 90 and the axis of the rotation shaft 21 is θ1, and the angle between the inner circumferential surface of the cylindrical portion 91a of the mounting member 90 and the axis of the rotation shaft 21 is θ2, then it is preferable that 15°≦θ1 and 15°≦θ2. Furthermore, it is preferable that 30°≦θ1 and 30°≦θ2, and θ1≦45° and θ2≦45°. Furthermore, in the mounting portion 91 of the mounting member 90, if R is the radius of curvature at the bottom of the groove formed by the opposing surface facing the second water-sealing rubber 60b and the outer circumferential surface of the cylindrical portion 91a, then it is preferable that 0.05 mm ≤ R ≤ 2 mm.

[0190] Figure 14 is an enlarged cross-sectional view showing a part of the motor 1C according to a modified example of Embodiment 3. As shown in Figure 14, a recess 91b may be formed on the inside of the mounting portion 91 of the mounting member 90, and a retaining ring 98 may be fixed to the portion of the rotating shaft 21 located at the recess 91b. The retaining ring 98 fixed to the rotating shaft 21 rotates together with the rotating shaft 21. The retaining ring 98 is fitted into a groove in the rotating shaft 21. The retaining ring 98 and the rotating shaft 21 are in close contact without any gaps. The retaining ring 98 is, for example, an annular ring or an E-ring. However, it is not limited to these. The retaining ring 98 may be made of metal or resin. By providing the retaining ring 98 in this way, even if water passes through the gap between the cylindrical portion 91a of the mounting member 90 and the second water-sealing rubber 60b, and that water falls onto the rotating shaft 21 and travels along the surface of the rotating shaft 21, the retaining ring 98 can stop the movement of the water. This effectively prevents the water from entering the inside of the motor 1C.

[0191] (Modification) The motors relating to this disclosure have been described above based on Embodiments 1 to 3. However, this disclosure is not limited to Embodiments 1 to 3.

[0192] For example, in Embodiment 1, the vibration isolation ring 50 has an end plate 53. However, it is not limited to this. Specifically, the vibration isolation ring 50 may not have an end plate 53 and may be composed only of an elastic body 51 and a metal ring 52. In this case, the elastic body 51 of the vibration isolation ring 50 is in contact with the first bracket 41 and the second bracket 42.

[0193] Furthermore, in the first embodiment described above, the cylindrical portion 51c that performs the waterproofing function is provided on the elastic body 51. In the second embodiment described above, the cylindrical portion 53c that performs the waterproofing function is provided on the end plate 53B. However, it is not limited to these. Such a cylindrical portion that performs the waterproofing function may be provided on a component other than the elastic body 51 and the end plate 53B of the vibration damping ring. In other words, it is sufficient that the vibration damping ring has a cylindrical portion (first cylindrical portion) that performs the waterproofing function, and that the cylindrical portion 62 (second cylindrical portion) of the drain rubber 60 is configured to surround the cylindrical portion of the vibration damping ring.

[0194] Furthermore, in the first embodiment described above, the two vibration isolation rings 50 are the same. In the modified example of the first embodiment described above, the two vibration isolation rings 50A are also the same. In the second embodiment described above, the two vibration isolation rings 50B are also the same. However, it is not limited to these. In other words, the two vibration isolation rings used in one motor may be of different shapes. Specifically, two vibration isolation rings of different shapes may be used from among vibration isolation ring 50, vibration isolation ring 50A, and vibration isolation ring 50B.

[0195] Furthermore, in embodiments 1 to 3 described above, each of the motors 1, 1A, 1B, and 1C is a double-shaft motor in which both ends of the rotating shaft 21 protrude from the first bracket 41 and the second bracket 42, respectively. However, it is not limited to this. Specifically, each of the motors 1, 1A, 1B, and 1C may be a single-shaft motor in which only one end of the rotating shaft 21 protrudes from only one of the first bracket 41 and the second bracket 42.

[0196] Furthermore, in embodiments 1 to 3 described above, the rotor 20 is an IPM rotor in which a plurality of permanent magnets 23 are inserted into magnet insertion holes 22a of the rotor core 22. However, it is not limited to this. Specifically, the rotor 20 may be a surface magnet type (SPM: Surface Permanent Magnet) rotor in which a plurality of permanent magnets are fixed to the outer circumferential surface of the core.

[0197] Furthermore, in embodiments 1 to 3 described above, the windings 12 of the stator 10 are wound around the stator core 11 in a concentrated winding manner. However, this is not the only option. For example, the windings 12 of the stator 10 may be wound around the stator core 11 in a distributed winding manner.

[0198] Furthermore, in embodiments 1 to 3 described above, each of the motors 1, 1A, 1B, and 1C is a molded motor. However, it is not limited to this. The technology of this disclosure can be applied to motors other than molded motors. In other words, the technology of this disclosure can also be applied to motors in which the stator 10 is not covered with molded resin 70. In this case, the motor has, for example, a metal case that houses the stator 10.

[0199] Furthermore, in embodiments 1 to 3 described above, motors 1, 1A, 1B, and 1C are brushless motors. However, the invention is not limited to this. The technology of this disclosure can also be applied to brushed motors that use brushes.

[0200] Furthermore, in the above embodiments 1 to 3, each of the motors 1, 1A, 1B, and 1C was described in terms of its application to a fan motor in an air conditioner, which is an air conditioning device. However, it is not limited to this. For example, the motor 1 in the above embodiments can be used in various products such as household electrical appliances and industrial electrical appliances.

[0201] Furthermore, forms obtained by applying various modifications to the above embodiments that a person skilled in the art could conceive of, or forms realized by arbitrarily combining the components and functions of the embodiments without departing from the spirit of this disclosure, are also included in this disclosure. Arbitrary combinations of two or more claims from the multiple claims described in the claims of this application, within the scope of which they do not contradict each other, are also included in this disclosure. For example, if the cited claims described in the claims of this application are made into a multi-claim or multi-multi-claim so as to refer to all of the higher-level claims within the scope of which they do not contradict each other, then all combinations of claims included in that multi-claim or multi-multi-claim are also included in this disclosure.

[0202] The motor described herein can be widely used in various products that include a motor.

[0203] 1, 1A, 1B, 1C, 1X Motor 2a, 2b, 2c, 2d Water 10, 10X Stator 11 Stator core 12 Winding 13 Insulator 20, 20X Rotor 21, 21X Rotating shaft 21a First end 21b Second end 21c Groove 22 Rotor core 22a Magnet insertion hole 23 Permanent magnet 31 First bearing 32 Second bearing 41 First bracket 41a, 42a Through hole 41b, 42b Protrusion 42 Second bracket 42c Flat plate 50, 50A, 50B, 50C Vibration isolation ring (connecting member) 50a First vibration isolation ring 50b Second vibration isolation ring 51, 51A, 51B, 51C Elastic body 51a Main body 51a1 Opening 51a2, 51b2 Opposing surfaces 51b Flat plate portion 51b1 Opening 51c, 51cA, 71a, 91a Cylinder portion (first cylinder portion) 51d Groove 51e Flange portion 52 Metal ring 52a Divided portion 52b Groove 53, 53B End plate 53a Main body portion 53b Flat plate portion 53b2 Opposing surfaces 53c Cylinder portion 53d Groove 60 Water drain rubber (insulation prevention member) 60a First water drain rubber 60b Second water drain rubber 61 Main body portion 61a Through hole 62 Cylinder portion (second cylinder portion) 70 Molded resin 71 Protruding portion 80 Circuit board 90 Mounting member 91 Mounting portion 91b Recess 92 Cover portion 92a Recess 93 Fixing portion 95 Screw 98 Retaining ring 100 Support base 110 Motor mounting part 120 Locking piece 200 Fastening member 210 Metal band 211 Locking hole 220 Screw

Claims

1. A motor comprising: a rotor having a rotating shaft; a stator that generates a magnetic force acting on the rotor; a bracket having a through hole through which the rotating shaft is inserted; a connecting member connected to the bracket; and an anti-vibration member fixed to the rotating shaft and positioned with a gap between it and the connecting member in the longitudinal direction of the rotating shaft, wherein the connecting member has a cylindrical first cylindrical portion that protrudes toward the anti-vibration member from a surface facing the anti-vibration member and surrounds the rotating shaft, and the anti-vibration member has a cylindrical second cylindrical portion that surrounds the first cylindrical portion.

2. The motor according to claim 1, wherein the connecting member is a vibration-damping ring attached to the bracket.

3. The vibration-damping ring comprises an annular elastic body surrounding the rotating shaft and a metal ring provided along the outer circumferential surface of the elastic body, wherein the first cylindrical portion is a part of the elastic body, as described in claim 2.

4. The vibration-damping ring comprises an annular elastic body surrounding the rotating shaft, a metal ring provided along the outer circumferential surface of the elastic body, and an end plate provided along the inner circumferential surface of the elastic body, wherein the first cylindrical portion is a part of the end plate, the motor according to claim 2.

5. The motor according to any one of claims 2 to 4, wherein the bracket has a projection that protrudes outward in the longitudinal direction of the rotating shaft, a bearing that supports the rotating shaft is housed inside the projection, and the vibration-damping ring is attached to the projection.

6. The motor according to claim 5, comprising a molded resin covering the stator, wherein the bracket is fixed to the molded resin.

7. The motor according to claim 1, wherein the connecting member is a member to which a vibration-damping ring is attached.

8. The motor according to claim 7, comprising a molded resin covering the stator, wherein the bracket is fixed to the molded resin, and the connecting member is a part of the molded resin.

9. The motor according to claim 7, wherein the connecting member is a mounting member to which a vibration-damping ring is attached.

10. The motor according to claim 9, wherein the bracket is made of a metal material and has a projection that protrudes outward in the longitudinal direction of the rotating shaft, a bearing that supports the rotating shaft is housed inside the projection, the mounting member is fixed to the bracket at a location other than the projection, the mounting member has a cover that covers the projection, and a gap exists between the inner surface of the cover and the outer surface of the projection.

11. The motor according to claim 10, wherein a buffer member is provided in the gap.

12. The motor according to any one of claims 2 to 4, 7 to 11, wherein each of the bracket, the vibration-damping ring, and the anti-vibration member is provided in a pair so as to sandwich the stator in the longitudinal direction of the rotating shaft.

13. The motor according to any one of claims 1 to 4, 7 to 11, wherein the outer diameter of the first cylindrical portion gradually increases toward the anti-vibration member.

14. The motor according to claim 13, wherein the inner diameter of the first cylindrical portion gradually increases toward the anti-vibration member.

15. In a cross-sectional view, if the angle between the outer circumferential surface of the first cylindrical portion and the axis of the rotation shaft is θ1, and the angle between the inner circumferential surface of the first cylindrical portion and the axis of the rotation shaft is θ2, then 15° ≤ θ1 and 15° ≤ θ2, the motor according to claim 14.

16. The motor according to claim 15, wherein 30° ≤ θ1 and 30° ≤ θ2.

17. The motor according to claim 15, wherein θ1 ≤ 45° and θ2 ≤ 45°.

18. The motor according to any one of claims 1 to 4, 7 to 11, wherein the radius of curvature of the bottom of the groove formed by the opposing surface and the outer circumferential surface of the first cylindrical portion is R, and 0.05 mm ≤ R ≤ 2 mm.

19. The motor according to any one of claims 1 to 4, 7 to 11, wherein the anti-corrosion member is a rubber member.

20. The motor according to any one of claims 1 to 4, 7 to 11, wherein the motor is configured to be installed in a position in which the rotating shaft extends substantially horizontally.

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