Motor unit, blower, and air conditioner

Abstract

This motor unit includes: a motor including a shaft, a rotor attached to the shaft, a stator surrounding the rotor, and an outer shell member covering the stator; and a motor support supporting the motor, the motor support including a wall part in contact with an outer peripheral surface of the outer shell member. A first engagement part that is a recess or a protrusion is provided on the outer peripheral surface of the outer shell member. The wall part is provided with a second engagement part that is a protrusion or a recess engaging with the first engagement part of the outer shell member.

Description

Motor unit, blower and air conditioner

[0001] The present disclosure relates to a motor unit, a blower, and an air conditioning apparatus.

[0002] As motors become smaller, efficient dissipation of heat generated by the motor has become an issue. For example, Patent Document 1 proposes a motor that is fixed to a mounting base with screws, thereby improving heat dissipation from the motor through direct contact between the motor and the mounting base.

[0003] JP-A No. 62-037033 (see page 1, lines 3 to 8)

[0004] However, there is a limit to how much heat can be dissipated simply by placing the motor in direct contact with the mounting base, so there is a need for technology that can more efficiently dissipate the heat generated by the motor.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to efficiently dissipate heat generated by a motor.

[0006] The motor unit of the present disclosure includes a motor having a shaft, a rotor attached to the shaft, a stator surrounding the rotor, and an outer casing member covering the stator, and a motor support supporting the motor, the motor support having a wall portion in contact with the outer circumferential surface of the outer casing member. The outer circumferential surface of the outer casing member is provided with a first engagement portion which is a recess or a protrusion. The wall portion is provided with a second engagement portion which is a protrusion or a recess and engages with the first engagement portion of the outer casing member.

[0007] According to the present disclosure, contact between the wall portion of the motor support and the outer casing member of the motor, and engagement between the first engaging portion and the second engaging portion, allows heat generated by the motor to be efficiently dissipated via the motor support.

[0008] FIG. 1 is a cross-sectional view showing a motor according to a first embodiment. FIG. 2 is a perspective view showing a motor unit according to a first embodiment. FIG. 3 is an exploded perspective view showing a motor unit according to a first embodiment. FIG. 4 is a front view showing a motor unit according to a first embodiment. FIG. 5 is a diagram showing an engaging portion between a wall portion of a motor support according to a first embodiment and a molded stator, and FIG. 6 is a diagram showing another example of the engaging portion. FIG. 6 is a schematic diagram showing a state in which a motor according to a first embodiment is attached to a motor support. FIG. 7 is a perspective view showing a motor unit according to a second embodiment. FIG. 8 is a front view showing a motor unit according to a second embodiment. FIG. 9 is a perspective view showing a motor unit according to a third embodiment. FIG. 10 is a front view showing a motor unit according to a third embodiment. FIG. 11 is a diagram showing an air conditioning device to which the motors of the respective embodiments can be applied, and FIG. 12 is a diagram showing its outdoor unit.

[0009] Each embodiment will be described in detail below with reference to the drawings, but the present disclosure is not limited to these embodiments.

[0010] Embodiment 1. <Configuration of Motor 1> Fig. 1 is a diagram showing a motor 1 according to embodiment 1. As shown in Fig. 1, the motor 1 has a shaft 10, a rotor 2 fixed to the shaft 10, a stator 3 surrounding the rotor 2, and a molded resin part 40 as an outer member covering the stator 3. The central axis Ax of the shaft 10 defines the center of rotation of the rotor 2. The stator 3 and the molded resin part 40 are collectively referred to as a molded stator 4.

[0011] In the following description, the direction of the central axis Ax of the shaft 10, i.e., the direction of the rotation axis of the rotor 2, will be referred to as the "axial direction." The circumferential direction about the central axis Ax will be referred to as the "circumferential direction." The radial direction about the central axis Ax will be referred to as the "radial direction."

[0012] The shaft 10 protrudes from the molded stator 4 to one side in the axial direction, and a mounting portion 10a is formed at the tip of the protruding side to which, for example, an impeller 70 of a blower (FIG. 6) is attached. Therefore, the protruding side of the shaft 10 is referred to as the "load side," and the opposite side is referred to as the "anti-load side."

[0013] The rotor 2 has a rotor core 20 fixed to the shaft 10 and a plurality of magnets 22 embedded in the rotor core 20. The shaft 10 is fixed to a central hole 23 of the rotor core 20 by press-fitting or the like. However, a resin or the like may be provided between the shaft 10 and the rotor core 20.

[0014] The rotor core 20 is an annular member centered on the central axis Ax. The rotor core 20 is formed by stacking a plurality of laminated elements in the axial direction and integrating them by caulking or the like. The laminated elements are, for example, electromagnetic steel sheets, and have a thickness of 0.1 mm to 0.7 mm.

[0015] The rotor core 20 has a plurality of magnet insertion holes 21 along its outer periphery. The magnet insertion holes 21 are arranged at equal intervals in the circumferential direction of the rotor core 20. A magnet 22, which is a permanent magnet, is inserted into each magnet insertion hole 21. The magnet 22 is made of a rare earth magnet containing, for example, neodymium (Nd), iron (Fe), and boron (B).

[0016] The stator 3 has an annular stator core 30 that surrounds the rotor 2 from the radial outside, a coil 32 wound around the stator core 30 , and an insulating portion 31 provided between the stator core 30 and the coil 32 .

[0017] The stator core 30 is made by stacking a plurality of electromagnetic steel plates in the axial direction and integrating them by caulking or the like. The insulating portion 31 is formed of a thermoplastic resin such as PBT (polybutylene terephthalate). The insulating portion 31 may be molded integrally with the stator core 30, or may be molded in advance and then assembled to the stator core 30.

[0018] The coil 32 is made of magnet wire and is wound around the stator core 30 via an insulating portion 31. The coil 32 may be wound by concentrated winding or distributed winding.

[0019] The molded resin portion 40 is made of a thermosetting resin such as unsaturated polyester, more specifically, bulk molding compound (BMC). The molded resin portion 40 is molded integrally with the stator 3. An outer peripheral surface 41 of the molded resin portion 40 is the outer peripheral surface of the molded stator 4 and also the outer peripheral surface of the motor 1.

[0020] The molded resin part 40 is cylindrical with a bottom, and has an opening 45 on the load side and a bottom 46 on the anti-load side. The rotor 2 is inserted into the hollow space inside the stator 3 through the opening 45. A metal bracket 15 is attached to a mounting part 47 surrounding the opening 45 of the molded resin part 40. The bracket 15 holds the load-side bearing 11. The bottom 46 of the molded resin part 40 holds the anti-load-side bearing 12.

[0021] Bearings 11 and 12 are disposed on both axial sides of rotor 2 and are positioned axially relative to shaft 10 by E-rings 13 and 14. Bearings 11 and 12 rotatably support shaft 10. A cap 16 is fixed to shaft 10 to prevent moisture from entering bracket 15.

[0022] 2 is a perspective view showing the motor unit 6 having the motor 1 and the motor support 5 that supports it. The motor unit 6 is also called a motor assembly. The motor support 5 has a support plate 50 that serves as a base, and a wall portion 51 attached to the support plate 50.

[0023] The support plate 50 is, for example, a flat plate-like member perpendicular to the central axis Ax. The support plate 50 is formed of a material having high thermal conductivity and strength, such as a metal, preferably stainless steel. Openings 54 for allowing airflow may be formed at the upper and lower ends of the support plate 50.

[0024] A circular hole 53 for inserting the motor 1 is formed in the center of the support plate 50. The motor 1 is attached to the hole 53 of the support plate 50 so as to protrude from the support plate 50 on both sides in the axial direction.

[0025] N (N is an integer equal to or greater than 1) wall portions 51 are arranged around the hole 53 of the support plate 50 so as to surround the motor 1. In this example, the number (N) of wall portions 51 is four. However, the number of wall portions 51 may be one or more, and is preferably two or more.

[0026] The wall portions 51 are formed of, for example, metal, preferably stainless steel, and are fixed to the support plate 50 by, for example, welding. The wall portions 51 are formed at equal intervals in the circumferential direction around the central axis Ax.

[0027] 3 is an exploded perspective view showing the motor 1 and motor support 5 of the motor unit 6 separately. Recesses 42 serving as first engagement portions are formed on the outer peripheral surface 41 of the molded resin portion 40 of the motor 1. The number of recesses 42 is four here, but it may be the same as the number of wall portions 51 of the motor support 5. The recesses 42 are grooves extending in the axial direction. The recesses 42 are formed at equal intervals in the circumferential direction.

[0028] The inner peripheral surface 51a of the wall portion 51 of the motor support 5 is a concave curved surface that conforms to the outer peripheral surface 41 of the molded resin portion 40 of the motor 1. More specifically, the inner peripheral surface 51a of the wall portion 51 is formed in an arc shape centered on the central axis Ax. The inner peripheral surface 51a of the wall portion 51 comes into contact with the outer peripheral surface 41 of the molded resin portion 40.

[0029] Like the inner peripheral surface 51a, the outer peripheral surface 51b of the wall portion 51 is preferably formed in an arc shape centered on the central axis Ax. In this case, the radial thickness of the wall portion 51 is constant in the circumferential direction.

[0030] A protrusion 52 serving as a second engagement portion is formed on the inner circumferential surface 51 a of the wall portion 51. The protrusion 52 protrudes radially inward from the inner circumferential surface 51 a of the wall portion 51 and is formed in the shape of a rail that is long in the axial direction.

[0031] 4 is a front view of the motor unit 6. The inner peripheral surface 51a of the wall portion 51 contacts the outer peripheral surface 41 of the molded resin portion 40 (i.e., the outer peripheral surface of the molded stator 4), thereby increasing the contact area between the molded stator 4 and the motor support 5. In addition, the protrusions 52 of the wall portion 51 engage with the recesses 42 of the outer peripheral surface 41 of the molded resin portion 40.

[0032] 5A is an enlarged view showing the engagement portion between the wall portion 51 of the motor support 5 and the molded stator 4. The inner circumferential surface 51a of the wall portion 51 is arc-shaped about the central axis Ax in a plane perpendicular to the axial direction. The outer circumferential surface 41 of the molded stator 4 is a cylindrical surface about the central axis Ax. Therefore, the inner circumferential surface 51a of the wall portion 51 and the outer circumferential surface 41 of the molded stator 4 are in close contact with each other.

[0033] In addition, in a plane perpendicular to the central axis Ax, the recess 42 of the molded stator 4 has a bottom surface 42 a and side surfaces 42 b on both circumferential sides thereof, and the protrusion 52 of the motor support 5 has a tip surface 52 a and side surfaces 52 b on both circumferential sides thereof. The bottom surface 42 a of the recess 42 and the tip surface 52 a of the protrusion 52 are in contact with each other, and the side surfaces 42 b of the recess 42 and the side surfaces 52 b of the protrusion 52 are in contact with each other.

[0034] In this way, the recess 42 on the outer surface 41 of the molded stator 4 and the protrusion 52 on the wall portion 51 engage with each other, so that the motor 1 is fixed to the motor support 5 and the contact area between the motor 1 and the motor support 5 is further increased.

[0035] The recessed portion 42 and the protruding portion 52 can be fixed by adhesive. In this case, adhesive is applied to the inner surface of the recessed portion 42 (i.e., the bottom surface 42 a and the side surface 42 b), or the surface of the protruding portion 52 (i.e., the tip surface 52 a and the side surface 52 b), or both.

[0036] The recess 42 and the protrusion 52 may also be fixed by press-fitting. In this case, the protrusion 52 is fitted into the recess 42 so that the side surfaces 52b of the protrusion 52 press and spread the space between the side surfaces 42b of the recess 42. Fixation using screws will be described in embodiment 2 (FIGS. 7 and 8).

[0037] Fig. 5(B) is a schematic diagram showing another example of the engagement portion between the wall portion 51 of the motor support 5 and the molded stator 4. In Fig. 5(A) described above, the molded stator 4 is provided with the recessed portion 42, and the wall portion 51 of the motor support 5 is provided with the protruding portion 52. However, as shown in Fig. 5(B), the molded stator 4 may be provided with the protruding portion 49, and the wall portion 51 of the motor support 5 may be provided with the recessed portion 59 that engages with the protruding portion 49.

[0038] 6 is a schematic diagram showing the motor 1 attached to the motor support 5. As shown in Fig. 6, the motor 1 is attached to the hole 53 so as to protrude on both the load side and the anti-load side (i.e., both axial sides) of the support plate 50 of the motor support 5. The wall portions 51 are provided on both the load side and the anti-load side of the support plate 50.

[0039] The motor support 5 may be provided with a bottom 55 that contacts the bottom 46 of the molded resin portion 40 of the motor 1. The bottom 55 is a flat plate-shaped portion that is perpendicular to the axial direction and is provided to connect the ends of the four wall portions 51 on the anti-load side. This further increases the contact area between the motor 1 and the motor support 5. The bottom 55 also serves to position the four wall portions 51 relative to one another.

[0040] An impeller 70 is fixed to a mounting portion 10a at the tip of the shaft 10. Note that the impeller 70 is shown in a simplified form in Figure 6. When the motor unit 6 is attached to the outdoor unit 101 (Figure 11(B)), a heat exchanger 71 is disposed on the anti-load side of the motor unit 6. As the impeller 70 rotates, air that has passed through the heat exchanger 71 passes through the motor unit 6 in the axial direction as shown by the arrows.

[0041] <Heat Dissipation Effect> Next, a description will be given of the heat dissipation effect of the motor unit 6 of embodiment 1. In the motor 1, heat is generated when a current flows through the coil 32 of the stator 3. The heat generated in the motor 1 is dissipated through three paths.

[0042] The first heat dissipation path is a heat dissipation path by natural convection from the outer peripheral surface 41 of the molded stator 4 (i.e., the outer peripheral surface of the molded resin portion 40). The second heat dissipation path is a heat dissipation path by forced convection caused by the airflow caused by the rotation of the impeller 70 flowing along the outer peripheral surface 41 of the molded stator 4. The third heat dissipation path is a heat dissipation path by thermal conduction from the molded stator 4 to the motor support 5. Of these first to third heat dissipation paths, the third heat dissipation path is dominant.

[0043] In embodiment 1, the outer surface 41 of the molded stator 4 is in contact with the inner surface 51a of the wall portion 51 of the motor support 5, so that the contact area between the molded stator 4 and the motor support 5 can be increased, and the amount of heat dissipation by thermal conduction from the molded stator 4 to the motor support 5 can be increased.

[0044] A portion of the heat transferred from the motor 1 to the motor support 5 is dissipated as the airflow passes through the motor support 5, and another portion is dissipated from the housing 106 (Figure 11 (B)) of the outdoor unit 101 to which the motor support 5 is attached, etc.

[0045] Furthermore, the motor 1 can be fixed to the motor support 5 by the engagement between the recessed portion 42 of the molded resin portion 40 and the protruding portion 52 of the motor support 5. Furthermore, the contact between the recessed portion 42 and the protruding portion 52 can further increase the contact area.

[0046] In particular, because the recess 42 of the molded resin portion 40 and the protrusion 52 of the wall portion 51 both extend in the axial direction, the recess 42 and the wall portion 51 can be engaged by pressing the motor 1 axially against the wall portion 51 of the motor support 5. This simplifies assembly of the motor unit 6.

[0047] Furthermore, since the bottom 46 of the molded stator 4 comes into contact with the bottom 55 of the motor support 5, the contact area between the molded stator 4 and the motor support 5 can be further increased.

[0048] Although the motor support 5 has been described here as having four wall portions 51, the number of wall portions 51 (assumed to be N) is not limited to four and may be one or more. Furthermore, it is sufficient that at least one of the N wall portions 51 has a protrusion 52. Furthermore, the wall portion 51 may be formed in a cylindrical shape so as to surround the molded stator 4.

[0049] Further, although the motor support 5 has the bottom 55 here, it does not necessarily have to have the bottom 55. In this case, the airflow that has passed through the heat exchanger 71 can be directed to the bottom 46 of the mold stator 4.

[0050] In addition, here, the motor 1 is inserted into the hole 53 of the motor support 5 and is positioned so that it protrudes on both axial sides of the motor support 5 (see Figure 6), but the motor 1 may also be attached to one axial side of the motor support 5 (for example, the load side).

[0051] <Effects of the embodiment> As described above, the motor unit 6 of the first embodiment has the motor 1 and the motor support 5, and the outer peripheral surface 41 of the molded resin portion 40 of the motor 1 is provided with a recess 42 as a first engagement portion. The motor support 5 also has a wall portion 51 that contacts the outer peripheral surface 41 of the molded resin portion 40, and the wall portion 51 is provided with a protrusion 52 that serves as a second engagement portion that is formed in the recess 42 of the molded resin portion 40. This makes it possible to increase the contact area between the motor 1 and the motor support 5, and to efficiently dissipate heat generated by the motor 1 via the motor support 5.

[0052] Furthermore, since the motor support 5 has two or more wall portions 51, the motor 1 and the motor support 5 can be fixed with uniform force in the circumferential direction, and the contact area between the motor 1 and the motor support 5 can be made larger.

[0053] Furthermore, by fixing the recessed portion 42 of the molded resin portion 40 and the protruding portion 52 of the motor support 5 by press-fitting, the motor 1 and the motor support 5 can be reliably fixed together without using screws.

[0054] Furthermore, by fixing the recessed portion 42 of the molded resin portion 40 and the protruding portion 52 of the motor support 5 with adhesive, the motor 1 and the motor support 5 can be fixed together more firmly.

[0055] Furthermore, since the recess 42 of the molded resin part 40 and the protrusion 52 of the motor support 5 both extend in the axial direction of the shaft 10, the recess 42 and the protrusion 52 can be engaged by pushing the motor 1 axially into the motor support 5, thereby simplifying the assembly of the motor unit 6.

[0056] Furthermore, since the inner surface 51a of the wall portion 51 of the motor support 5 is a curved surface that follows the outer surface 41 of the molded resin portion 40, the inner surface 51a of the wall portion 51 and the outer surface 41 of the molded resin portion 40 are brought into close contact with each other, thereby promoting heat transfer from the motor 1 to the motor support 5.

[0057] In addition, the motor support 5 has a support plate 50, the motor 1 is inserted into a hole 53 in the support plate 50, and walls 51 are provided on both axial sides of the support plate 50, so that the airflow that passes through the heat exchanger 71 is blown directly onto the wall 51 on the anti-load side, further improving heat dissipation.

[0058] Embodiment 2. Figure 7 is a perspective view showing a motor unit 6A of embodiment 2. Figure 8 is a front view showing the motor unit 6A of embodiment 2. As shown in Figures 7 and 8, the motor unit 6A of embodiment 2 differs from the motor unit 6 of embodiment 1 in that the molded resin part 40 of the motor 1A has mounting legs 43 and is fixed to the motor support 5A with screws 56.

[0059] The outer peripheral surface 41 of the molded resin portion 40 (i.e., the outer peripheral surface of the molded stator 4) is provided with mounting legs 43, the same number as the wall portions 51 of the motor support 5A. In this example, the number of mounting legs 43 is four. Each mounting leg 43 protrudes radially outward from a gap between adjacent wall portions 51. A through hole 44 is formed in each mounting leg 43, penetrating the mounting leg 43 in the axial direction.

[0060] Screws 56 are inserted into the through holes 44 and engage with threaded holes (not shown) formed in the support plate 50. The motor 1A is attached to the motor support 5A by the engagement of the screws 56 with the threaded holes. The support plate 50 of the motor support 5A is the same as the support plate 50 of the motor support 5 of the first embodiment, but with threaded holes added.

[0061] The number of mounting legs 43 of the molded resin part 40 may be less than the number of wall parts 51 of the motor support 5A. The number of mounting legs 43 of the molded resin part 40 may be one or more, and two or more is more preferable.

[0062] Except for the points mentioned above, the motor unit 6A of embodiment 2 is configured similarly to the motor unit 6 of embodiment 1. When attaching the motor 1A to the motor support 5A, fixing with the screws 56 may be combined with press-fitting or bonding the recessed portions 42 and the protruding portions 52 described in embodiment 1.

[0063] In the second embodiment, the mounting legs 43 and screws 56 are required, but the motor 1A can be attached to the motor support 5A more firmly. Furthermore, the mounting legs 43 of the molded resin part 40 are disposed in the gaps between the wall parts 51 adjacent in the circumferential direction, thereby ensuring contact between the wall parts 51 and the outer peripheral surface 41 of the molded resin part 40. Furthermore, the mounting legs 43 come into contact with the support plate 50 of the motor support 5A, further increasing the contact area between the motor 1A and the motor support 5A.

[0064] Embodiment 3. Figure 9 is a perspective view showing a motor unit 6B according to embodiment 3. Figure 10 is a front view showing the motor unit 6B according to embodiment 3. The motor unit 6B according to embodiment 3 differs from the motor unit 6 according to embodiment 1 in that fins 58 are formed on the outer peripheral surface 51b of the wall portion 51 of the motor support 5B.

[0065] Five fins 58 are provided on the outer peripheral surface 51b of each wall portion 51 of the motor support 5B. The number of fins 58 is not limited to five, but may be one or more, and is preferably two or more. These fins 58 are spaced apart in the circumferential direction. Each fin 58 extends in the axial direction.

[0066] The fins 58 are preferably formed integrally with the wall portion 51. However, the fins 58 may be formed as separate members from the wall portion 51 and fixed to the wall portion 51 by adhesive or the like.

[0067] Heat generated by motor 1B is transferred from outer peripheral surface 41 of molded stator 4 to wall portion 51, with some of the heat being dissipated from fins 58 on wall portion 51 and another portion being transferred to support plate 50 for dissipation. Because fins 58 are provided on wall portion 51, the heat dissipation area of ​​motor support 5B is larger than the heat dissipation area of ​​motor support 5 in embodiment 1. Therefore, heat generated by motor 1B can be efficiently dissipated via motor support 5B.

[0068] 9, the wall portion 51 of the motor support 5B is provided on both the load side and the anti-load side of the support plate 50, which further increases the heat dissipation area. In addition, air that has passed through the heat exchanger 71 (FIG. 6) is directly blown onto the fins 58 of the wall portion 51 on the anti-load side of the support plate 50, which further improves heat dissipation.

[0069] Here, the fins 58 extend in the axial direction, but are not limited to this shape, and may have any shape that can increase the heat dissipation area of ​​the outer peripheral surface 51b of the wall portion 51. For example, the fins 58 may be formed by dispersing minute protrusions on the outer peripheral surface 51b of the wall portion 51.

[0070] Furthermore, it is most desirable to form the fins 58 on all of the N wall portions 51 of the motor support 5B, but it is sufficient that the fins 58 are formed on at least one wall portion 51.

[0071] Except for the points mentioned above, the motor unit 6B of the third embodiment is configured similarly to the motor unit 6 of the first embodiment.

[0072] In the motor unit 6B of embodiment 3, fins 58 are provided on the outer surface 51b of the wall portion 51 of the motor support 5B, thereby increasing the heat dissipation area of ​​the motor support 5B and enabling the heat generated by the motor 1B to be efficiently dissipated via the motor support 5B.

[0073] <Air Conditioning Apparatus> Next, an air conditioner to which the motor units 6, 6A, and 6B of the above-described first, second, and third embodiments can be applied will be described. Fig. 11(A) is a diagram showing the configuration of an air conditioner 100 to which the motor unit 6 of the first embodiment is applied. The air conditioner 100 includes an outdoor unit 101 and an indoor unit 102. The outdoor unit 101 and the indoor unit 102 are connected by a refrigerant pipe 103.

[0074] The outdoor unit 101 includes a compressor 104, a condenser 105 (FIG. 11B), an outdoor blower 110, and a housing 106 that houses these components. The outdoor blower 110 is, for example, a propeller fan. The outdoor blower 110 includes an impeller 111 and a motor 1 that drives the impeller 111.

[0075] The indoor unit 102 includes an evaporator 122, an indoor blower 120, and a housing 123 that houses these components. The indoor blower 120 is, for example, a crossflow fan. The indoor blower 120 has an impeller 121 and a motor 1M that drives the impeller 121.

[0076] 11(B) is a cross-sectional view of the outdoor unit 101. The motor 1 is supported by a motor support 5 arranged inside the housing 106 of the outdoor unit 101. An impeller 70 is attached to the shaft 10 of the motor 1 via a hub 17. The configurations of the motor 1 and the motor support 5 are as described in the first embodiment. The motor 1 and the motor support 5 constitute a motor unit 6.

[0077] In the outdoor blower 110, the impeller 70 is rotated by the motor 1 to blow air to the outside. During cooling operation of the air conditioner 100, the heat released when the refrigerant compressed by the compressor 104 is condensed in the condenser 105 is released to the outside by the air blown by the outdoor blower 110.

[0078] In the indoor fan 120 (FIG. 11A), an impeller 121 is rotated by a motor 1M to blow air into the room. During cooling operation of the air conditioner 100, the air that has lost heat when the refrigerant evaporates in the evaporator 122 is blown into the room by the indoor fan 120.

[0079] In the motor unit 6 of the first embodiment, a stable operating state is maintained because the heat generated by the motor 1 is efficiently dissipated from the motor support 5. This improves the reliability of the outdoor blower 110, and thereby improves the reliability of the air conditioning apparatus 100.

[0080] Moreover, the motor units 6A and 6B of the second and third embodiments may be used instead of the motor unit 6 of the first embodiment. Moreover, the motor units 6, 6A and 6B of the first, second and third embodiments are not limited to the outdoor blower 110, and may be provided in at least one of the outdoor blower 110 and the indoor blower 120.

[0081] Although the preferred embodiments have been specifically described above, the present disclosure is not limited to the above-described embodiments, and various improvements and modifications can be made.

[0082] DESCRIPTION OF SYMBOLS 1, 1A, 1B Motor, 2 Rotor, 3 Stator, 4 Molded stator, 5, 5A, 5B Motor support, 6, 6A, 6B Motor unit, 10 Shaft, 20 Rotor core, 22 Magnet, 30 Stator core, 32 Coil, 40 Molded resin portion (outer shell member), 41 Outer peripheral surface, 42 Recessed portion (first engagement portion), 43 Mounting leg, 44 Through hole, 45 Opening, 46 Bottom portion, 49 Convex portion (first engagement portion), 50 Support plate (base), 51 Wall portion, 51a Inner peripheral surface, 51b Outer peripheral surface, 52 Convex portion (second engagement portion), 52a Tip surface, 52b Side surface, 53 Hole portion, 55 Bottom body, 56 Screw, 58 Fin 59 Recess (second engagement portion), 70 Impeller, 71 Heat exchanger, 100 Air conditioner, 101 Outdoor unit, 102 Indoor unit, 110 Outdoor blower, 120 Indoor blower, 121 Impeller.

Claims

1. A motor having a shaft, a rotor attached to the shaft, a stator surrounding the rotor, and an outer casing member covering the stator, and a motor support for supporting the motor, the motor support having a wall portion that contacts an outer peripheral surface of the outer casing member, wherein a first engaging portion, which is a concave portion or a convex portion, is provided on the outer peripheral surface of the outer casing member, and a second engaging portion, which is a convex portion or a concave portion that engages with the first engaging portion of the outer casing member, is provided on the wall portion.

2. The motor unit according to claim 1, wherein the wall portion is one of two or more wall portions provided on the motor support so as to contact the outer peripheral surface of the outer casing member, and the two or more wall portions are arranged at intervals in a circumferential direction centered on the shaft.

3. The motor unit according to claim 1 or 2, wherein the first engaging portion and the second engaging portion are fixed by adhesion.

4. The motor unit according to claim 1 or 2, wherein the first engaging portion and the second engaging portion are fixed by press-fitting.

5. The motor unit according to any one of claims 1 to 4, wherein the motor and the motor support are fixed by screws.

6. The motor unit according to claim 5, wherein the motor has mounting legs protruding from the outer peripheral surface of the outer casing member, and through holes for inserting the screws are formed in the mounting legs.

7. The motor unit according to any one of claims 1 to 6, wherein the wall portion has fins on a surface opposite to the side facing the motor.

8. The motor unit according to any one of claims 1 to 7, wherein both the first engaging portion and the second engaging portion extend in an axial direction of the shaft.

9. The motor unit according to any one of claims 1 to 8, wherein the wall portion has a concave curved surface along the outer peripheral surface of the outer casing member on a side facing the motor.

10. The motor support has a support plate extending in a direction orthogonal to the axial direction of the shaft. The support plate has a hole into which the motor is inserted. The motor support has the wall portions on both sides in the axial direction of the shaft with respect to the support plate. The motor unit according to any one of claims 1 to 9.

11. The outer member has an opening that projects the shaft to one side in its axial direction and has a bottom portion on the opposite side in the axial direction. The motor support has a bottom body that contacts the bottom portion of the outer member. The motor unit according to any one of claims 1 to 10.

12. The outer member is a molded resin portion integrally formed with the stator. The motor unit according to any one of claims 1 to 11.

13. A blower including the motor unit according to any one of claims 1 to 12 and an impeller rotated by the motor of the motor unit.

14. An air conditioner including an outdoor unit and an indoor unit connected to the outdoor unit, wherein at least one of the outdoor unit and the indoor unit has the blower according to claim 13.

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