Motors, blowers, and refrigeration equipment

Abstract

The present invention provides a motor, a blower, and a refrigeration device that enable an improvement in the magnetic flux of permanent magnets. [Solution] The motor 14 comprises a rotor 23 having a permanent magnet 42 and rotatable about a rotation axis Z, and a stator 21 having a stator core 31 radially opposite to the permanent magnet 42, and coils 32 attached to the stator core 31. The permanent magnet 42 has a first portion 51 and a second portion 52 that occupies an area other than the area occupied by the first portion 51 in the axial direction of the permanent magnet 42. The radial length L1 of the first portion 51 is longer than the radial length L2 of the second portion 52.

Description

Technical Field

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[0001] The present disclosure relates to a motor, a blower, and a refrigeration device.

Background Art

[0002] For example, in the motor described in Patent Document 1, the permanent magnet of the rotor has a uniform radial length in the axial direction. The magnetization direction of the permanent magnet is set to face the stator facing in the radial direction. The rotor provided with the permanent magnet rotates by the action of the magnetic field generated in the stator by energization.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a motor as described above, from the viewpoint of improving the output, it is desired to increase the magnetic flux amount of the permanent magnet with respect to the stator. The object of the present disclosure is to provide a motor, a blower, and a refrigeration device capable of improving the magnetic flux amount of the permanent magnet.

Means for Solving the Problems

[0005] A motor according to a first aspect for solving this problem includes a rotor having a permanent magnet and rotatable about a rotation axis, a stator core facing the permanent magnet in the radial direction, and a stator having a coil attached to the stator core, wherein the permanent magnet has a first portion and a second portion occupying a range other than the range occupied by the first portion in the axial direction of the permanent magnet, and the radial length of the first portion is longer than the radial length of the second portion.

[0006] This configuration allows the permanent magnet to become radially thicker in the first section, thereby increasing the magnetic flux of the permanent magnet. As a result, it can contribute to improving the motor's output. The motor of the second perspective is the motor of the first perspective, wherein the second portion has an opposing surface that faces radially with respect to the stator core, and the first portion is provided at a position that does not face radially with respect to the stator core and has a first projection that protrudes radially toward the stator side than the opposing surface.

[0007] With this configuration, the first portion of the permanent magnet has a first protrusion that extends toward the stator side, which makes it possible to increase the radial length of the first portion. In the motor of the third viewpoint, the first protrusion is axially opposed to the stator core in the motor of the second viewpoint.

[0008] With this configuration, the first protrusion of the permanent magnet faces the stator core in the axial direction, which allows for an increase in the area of ​​contact between the permanent magnet and the stator core, contributing to a further improvement in magnetic flux.

[0009] In the motor of the fourth view, the direction of the remanent magnetization of the first protrusion includes a component along the axial direction. This configuration makes it possible to improve the amount of magnetic flux directed from the first protrusion towards the stator core.

[0010] In the fifth aspect of the motor, the direction of the remanent magnetization in the range including at least the radial tip of the first projection, as in the motor of the fourth aspect, includes a component along the axial direction. This configuration allows for a more effective improvement in the amount of magnetic flux directed from the first protrusion towards the stator core.

[0011] The motor of the sixth perspective is the motor of the first perspective, wherein the permanent magnet is arranged radially outward of the stator, and the first portion has a second protrusion that protrudes radially outward more than the second portion in the radial direction.

[0012] According to this configuration, in an outer rotor where the permanent magnets are arranged radially outward from the stator, by providing a second protrusion on the first portion of the permanent magnet, it becomes possible to increase the radial thickness of the first portion by utilizing the space radially outward from the permanent magnet.

[0013] In the motor of the seventh perspective, the first part is radially opposed to the stator core in the motor of the sixth perspective. This configuration allows the magnetic flux from the first section to be effectively directed towards the stator, contributing to improved output.

[0014] The motor of the eighth aspect is the motor of the sixth or seventh aspect, wherein the rotor comprises a top plate fixed to the rotating shaft and holding the permanent magnet, and an outer peripheral wall fixed to the top plate and located radially outward from the permanent magnet, the stator comprises a cover member disposed between the permanent magnet and the outer peripheral wall, and the second projection faces the cover member in the axial direction.

[0015] This configuration allows for the formation of a labyrinth structure between the outer circumferential wall of the rotor, the cover member, and the second protrusion of the permanent magnet, thereby suppressing the entry of dust into the interior.

[0016] The motor of the ninth aspect is a motor of any one of the first to eighth aspects, wherein the permanent magnet is arranged radially outward of the stator, the rotor has a top plate fixed to the rotating shaft and holding the permanent magnet, and the first part is provided axially on the top plate side of the second part.

[0017] This configuration allows the rotor and stator to be assembled in an outer rotor type motor where the permanent magnets are positioned radially outward from the stator, so that the first portion of the permanent magnets does not interfere with the stator.

[0018] The motor according to the 10th aspect is the motor according to any one of the 1st to 5th aspects, wherein the motor is housed in a housing, the housing having a housing body integrally formed with a cylindrical side wall portion and a bottom wall portion provided at one axial end of the side wall portion, and an end frame closing an end of the side wall portion opposite to the bottom wall portion, the stator being held inside the side wall portion, the permanent magnet being disposed radially inside the stator, and the first portion being provided closer to the end frame side than the second portion in the axial direction.

[0019] According to this configuration, in an inner rotor type motor in which a permanent magnet is disposed radially inside a stator, it is possible to assemble the rotor and the stator so that the first portion of the permanent magnet does not interfere with the stator.

[0020] The motor according to the 11th aspect is the motor according to any one of the 1st to 10th aspects, wherein the permanent magnet is a bonded magnet. According to this configuration, since the permanent magnet can be manufactured by injection molding, it is possible to easily mold a complex shape of the permanent magnet.

[0021] The blower according to the 12th aspect includes the motor according to any one of the 1st to 11th aspects and a fan driven by the motor. According to this configuration, in the motor of the blower, it is possible to improve the magnetic flux amount of the permanent magnet.

[0022] The refrigeration device according to the 13th aspect includes the motor according to any one of the 1st to 11th aspects. According to this configuration, in the motor of the refrigeration device, it is possible to improve the magnetic flux amount of the permanent magnet.

Brief Description of the Drawings

[0023] [Figure 1] It is a schematic diagram of a refrigeration device in one embodiment. [Figure 2] It is a cross-sectional view of the motor in the same embodiment. [Figure 3] This is a partial cross-sectional view of the motor in the same embodiment. [Figure 4] This is a cross-sectional view showing the motor assembly configuration in the same embodiment. [Figure 5] This is a partial cross-sectional view of the motor in a modified example. [Figure 6] This is a partial cross-sectional view of the motor in a modified example. [Figure 7] This is a cross-sectional view of the motor in a modified example. [Modes for carrying out the invention]

[0024] <Motors, blowers, and refrigeration equipment> The motor 14, blower 13, and refrigeration device 10 will be described with reference to Figures 1 to 4. In this specification, "facing" refers to the position where surfaces or members are facing each other, and includes not only the case where they are completely facing each other, but also the case where they are partially facing each other. Furthermore, in this specification, "facing" includes both the case where a member other than the two parts is interposed between the two parts, and the case where nothing is interposed between the two parts.

[0025] <Refrigeration unit 10> As shown in Figure 1, the refrigeration system 10 is an air conditioner comprising an indoor unit 11 installed inside a room and an outdoor unit 12 installed outside a room. The indoor unit 11 is equipped with a blower 13 inside.

[0026] <Blower 13> The blower 13 comprises a motor 14 and a fan 15 driven by the motor 14. The fan 15 is, for example, a cross-flow fan.

[0027] <Motor 14> As shown in Figure 2, the motor 14 comprises a stator 21, a rotating shaft 22, and a rotor 23. The rotor 23 is configured to rotate around the rotation axis Z. In the following description, the direction along the rotation axis Z will be referred to as the "axial direction," the radial direction relative to the rotation axis Z will simply be referred to as the "radial direction," and the circumferential direction relative to the rotation axis Z will simply be referred to as the "circumferential direction."

[0028] <Stata 21> The stator 21 comprises a stator core 31, a coil 32 attached to the stator core 31, a mold 33, a base member 34, and a cover member 35. The stator 21 is formed in a cylindrical shape overall.

[0029] The stator core 31 is made of, for example, laminated electrical steel sheets. The stator core 31 has teeth 36 that extend radially and are arranged in parallel in the circumferential direction. The coil 32 is wound around the teeth 36. The teeth 36 are radially opposite to the permanent magnets 42 of the rotor 23, which will be described later. The coil 32 will be electrically connected to a power supply (not shown).

[0030] The mold 33 is made of resin and is formed to cover the stator core 31 and the coil 32. The base member 34 is, for example, a flat plate perpendicular to the rotation axis Z. The mold 33 is fixed to the base member 34. The cover member 35 is also fixed to the base member 34. When a drive current is supplied to the coil 32, the stator 21 generates a rotating magnetic field on its outer circumference. The mold 33 transfers the heat generated in the stator 21 to the base member 34.

[0031] A bearing 37 is fixed to the inner circumference of the stator 21. In this embodiment, the bearing 37 is a sliding bearing, but it may also be a ball bearing. The rotating shaft 22 is rotatably supported by the bearing 37. More specifically, the outer surface of the rotating shaft 22 is arranged so as to be in sliding contact with the inner surface of the bearing 37. As a result, the rotating shaft 22 is rotatably supported by the bearing 37 with its own axis center as the rotation axis Z. The rotating shaft 22 is made of, for example, metal.

[0032] <Rotor 23> The rotor 23 has a top plate 41 fixed to the rotating shaft 22, a permanent magnet 42 held by the top plate 41, and an outer peripheral wall 43 located radially outside the permanent magnet 42. The top plate 41 is made of, for example, resin. The top plate 41 is formed in a disc shape perpendicular to the rotation axis Z. The top plate 41 has fixing holes 41a that are fixed to the outer peripheral surface of the rotating shaft 22. The top plate 41 is fixed to a portion of the rotating shaft 22 that protrudes outward from the stator 21 in the axial direction. The aforementioned fan 15 is fixed to the top plate 41. As a result, the fan 15 rotates together with the top plate 41. The fan 15 is positioned on the opposite side of the top plate 41 from the side where the stator 21 is located (the left side in Figure 2).

[0033] The outer peripheral wall 43 of the rotor 23 is fixed, for example, to the outer edge of the top plate 41. The outer peripheral wall 43 is, for example, a part that is integral with the top plate 41 and is made of the same material as the top plate 41 (in this embodiment, resin). The outer peripheral wall 43 is, for example, cylindrical with the rotation axis Z as its center. The outer peripheral wall 43 extends, for example, from the outer edge of the top plate 41 along the axial direction.

[0034] <Permanent Magnet 42> The permanent magnet 42 is formed, for example, in a cylindrical shape and has multiple magnetic poles in the circumferential direction. The permanent magnet 42 is a bonded magnet made by molding and solidifying a magnetic material obtained by mixing magnetic powder with resin. The axial end of the permanent magnet 42 is fixed to the top plate 41. The permanent magnet 42 is provided on the inner circumference side of the outer peripheral wall 43, at a radial distance from the outer peripheral wall 43. The permanent magnet 42 is positioned so that its inner circumferential surface faces the outer peripheral surface of the stator core 31. That is, the motor 14 is an outer rotor type motor in which the permanent magnet 42 is positioned radially outside the stator 21. In the stator 21, the cover member 35 fixed to the base member 34 includes an intervening portion 35a positioned between the permanent magnet 42 and the outer peripheral wall 43. The intervening portion 35a is, for example, cylindrical with the rotation axis Z as its center. The cover member 35 with the intervening portion 35a suppresses the entry of dust into the inside of the motor 14.

[0035] The rotating shaft 22, the top plate 41, the permanent magnet 42, and the outer periphery wall 43 are integrally molded parts. More specifically, the rotating shaft 22, the top plate 41, the permanent magnet 42, and the outer periphery wall 43 are integrally molded by insert molding, with the rotating shaft 22 and the permanent magnet 42 acting as insert parts. As a result, the top plate 41 is fixed to the rotating shaft 22, the permanent magnet 42 is held in place by the top plate 41, and the outer periphery wall 43 is formed integrally with the top plate 41. The outer periphery surface of the rotating shaft 22 has knurling (not shown) applied to the part where the top plate 41 is fixed.

[0036] <Part 1 51 and Part 2 52> As shown in Figure 3, the permanent magnet 42 has a first portion 51 and a second portion 52 that occupies an area in the axial direction of the permanent magnet 42 other than the area occupied by the first portion 51. The second portion 52 has an opposing surface 53 that is radially opposite to the outer circumferential surface of the stator core 31. On the other hand, the first portion 51 is provided at a position that is not radially opposite to the stator core 31. In this embodiment, the first portion 51 is provided on the top plate 41 side in the axial direction compared to the second portion 52. The first portion 51 is provided, for example, at the end of the permanent magnet 42 on the top plate 41 side in the axial direction. Furthermore, the first portion 51 is molded integrally with the second portion 52.

[0037] The first portion 51 of the permanent magnet 42 has a first projection 54 that protrudes radially toward the stator 21 side (radially inward in this embodiment) than the opposing surface 53 of the second portion 52. The first projection 54 is provided continuously, for example, along the entire circumferential direction of the permanent magnet 42. Because the first portion 51 has the first projection 54, the radial length L1 of the first portion 51 is longer than the radial length L2 of the second portion 52. That is, the permanent magnet 42 is radially thicker in the first portion 51. Therefore, compared to a permanent magnet whose radial length is uniform in the axial direction, the magnetic flux of the permanent magnet 42 is increased in the first portion 51. Note that the radial length L1 of the first portion 51 and the radial length L2 of the second portion 52 are uniform in the axial direction.

[0038] The first projection 54 faces the axial end face 31a of the stator core 31 in the axial direction. The direction of remanent magnetization in the range including at least the radial tip 54a of the first projection 54 (see arrow in Figure 3) includes a component along the axial direction. In this embodiment, the direction of remanent magnetization over the entire radial direction of the first projection 54 includes a component along the axial direction. Furthermore, the direction of remanent magnetization in the range including the radial tip 54a of the first projection 54 is along the axial direction.

[0039] The axial end face 31a of the stator core 31 that faces the first protrusion 54 in the axial direction may be exposed from the mold 33 or covered by the mold 33. If the axial end face 31a is covered by the mold 33, the first portion 51 of the permanent magnet 42 faces the axial end face 31a in the axial direction via the mold 33.

[0040] The operation of this embodiment will now be explained. When a drive current is supplied to the coil 32, a rotating magnetic field is generated on the outer circumference of the stator 21. As a result, the rotor 23 is driven to rotate around the rotation axis Z, and the fan 15 rotates. This causes the fan 15 to perform a blowing operation. In the motor 14 of this embodiment, the magnetic flux of the permanent magnet 42 is increased in the first portion 51 which is thickened in the radial direction. Therefore, it is possible to improve the output of the motor 14.

[0041] As shown in Figure 4, when assembling the motor 14, the rotor 23 is mounted to the stator 21 in the assembly direction D1 along the rotation axis Z. In the permanent magnet 42, the end on the front side in the assembly direction D1 is referred to as the front end 42a of the permanent magnet 42, and the end on the rear side in the assembly direction D1 is referred to as the rear end 42b. When assembling the rotor 23, in the permanent magnet 42, the front end 42a is first inserted between the stator core 31 and the cover member 35 in the radial direction. Here, the first portion 51 of the permanent magnet 42, which is thickened in the radial direction, is located on the top plate 41 side (rear side in the assembly direction D1) than the second portion 52. This makes it possible to mount the rotor 23 to the stator 21 without the first portion 51 interfering with the stator core 31 or the mold 33.

[0042] The effects of this embodiment will now be explained. (1) The permanent magnet 42 has a first portion 51 and a second portion 52 that occupies the area other than the area occupied by the first portion 51 in the axial direction of the permanent magnet 42. The radial length L1 of the first portion 51 is longer than the radial length L2 of the second portion 52. With this configuration, the permanent magnet 42 is radially thicker in the first portion 51, which makes it possible to increase the magnetic flux of the permanent magnet 42. As a result, it can contribute to increasing the output of the motor 14.

[0043] (2) The second portion 52 has a facing surface 53 that is radially opposite to the stator core 31. The first portion 51 is provided at a position that is not radially opposite to the stator core 31. The first portion 51 has a first projection 54 that protrudes radially toward the stator 21 side than the facing surface 53. With this configuration, the first portion 51 of the permanent magnet 42 has a first projection 54 that protrudes toward the stator 21 side, which makes it possible to make the radial length L1 of the first portion 51 larger.

[0044] (3) The first protrusion 54 faces the stator core 31 in the axial direction. With this configuration, since the first protrusion 54 of the permanent magnet 42 faces the stator core 31 in the axial direction, the portion facing the permanent magnet 42 and the stator core 31 can be enlarged, which can contribute to an even greater improvement in magnetic flux. The first protrusion 54 may face the stator core 31 with a gap in between. Alternatively, the first protrusion 54 may face the stator core 31 with a gap and the mold 33 in between. Furthermore, it is desirable that the coil 32 is not interposed between the first protrusion 54 and the stator core 31 in the axial direction. That is, it is desirable that the first protrusion 54 faces the stator core 31 without the coil 32 in between.

[0045] (4) The direction of the remanent magnetization of the first protrusion 54 (see arrow in Figure 3) includes a component along the axial direction. With this configuration, the amount of magnetic flux from the first protrusion 54 toward the stator core 31 can be improved.

[0046] (5) The direction of the remanent magnetization in the range including at least the radial tip 54a of the first projection 54 includes a component along the axial direction. With this configuration, the amount of magnetic flux directed from the first projection 54 toward the stator core 31 can be improved more effectively.

[0047] (6) The permanent magnet 42 is positioned radially outward of the stator 21. The rotor 23 has a top plate 41 that is fixed to the rotating shaft 22 and holds the permanent magnet 42. The first portion 51 is provided axially closer to the top plate 41 than the second portion 52. With this configuration, in an outer rotor type motor 14 in which the permanent magnet 42 is positioned radially outward of the stator 21, the rotor 23 and the stator 21 can be assembled so that the first portion 51 of the permanent magnet 42 does not interfere with the stator 21.

[0048] (7) Since the permanent magnet 42 is a bonded magnet, the permanent magnet 42 can be manufactured by injection molding. Therefore, complex shapes of the permanent magnet 42 can be easily molded. <Variation> The motor 14, blower 13, and refrigeration device 10 of this disclosure may also be modified in ways other than those described above, such as those shown below, or in combination of at least two mutually non-inconsistent modifications.

[0049] As shown in Figure 5, the configuration of the permanent magnet 42 may be changed. In the example of the permanent magnet 42 shown in Figure 5, the first portion 51 has a second projection 55 that protrudes radially outward from the second portion 52. The second projection 55 protrudes radially on the side opposite to the side facing the stator 21. In the example shown in Figure 5, the first portion 51 having the second projection 55 is provided at a position that does not face the stator core 31 radially. The second projection 55 is provided, for example, continuously along the entire circumferential direction of the permanent magnet 42. In addition, the direction of remanent magnetization (see arrow in Figure 5) in at least the radially inner portion of the first portion 51 includes a component along the axial direction. This makes it possible to improve the amount of magnetic flux from the first portion 51 toward the stator core 31.

[0050] With the configuration shown in Figure 5, the permanent magnet 42 becomes radially thicker at the first portion 51, making it possible to improve the magnetic flux of the permanent magnet 42. As a result, it can contribute to improving the output of the motor 14. Furthermore, with the configuration shown in Figure 5, in an outer rotor type motor 14 where the permanent magnet 42 is arranged radially outward of the stator 21, by providing a second protrusion 55 on the first portion 51 of the permanent magnet 42, it is possible to make the first portion 51 radially thicker by utilizing the space radially outward of the permanent magnet 42.

[0051] Furthermore, in the configuration shown in Figure 5, the second protrusion 55 is positioned on the top plate 41 side relative to the intervening portion 35a of the cover member 35. That is, the second protrusion 55 faces axially with respect to the axial end surface 35b of the intervening portion 35a. With this configuration, a labyrinth structure can be formed by the outer peripheral wall 43 of the rotor 23, the cover member 35, and the second protrusion 55 of the permanent magnet 42, and as a result, the entry of dust into the inside of the motor 14 can be further suppressed.

[0052] In the configuration shown in Figure 5, the first portion 51 having the second protrusion 55 is positioned so as not to be radially opposed to the stator core 31, but the configuration is not limited to this. For example, as shown in Figure 6, the first portion 51 having the second protrusion 55 may be configured to be radially opposed to the stator core 31. With such a configuration, the first portion 51, which is radially thicker and has a large amount of magnetic flux, is radially opposed to the stator core 31, so the magnetic flux of the first portion 51 can be effectively directed towards the stator 21, which can contribute to improving the output of the motor 14. In the example shown in Figure 6, only a part of the axial direction of the first portion 51 is radially opposed to the stator core 31, but the configuration is not limited to this, and the entire axial direction of the first portion 51 may be radially opposed to the stator core 31.

[0053] In the above embodiment, the motor 14 is an outer rotor type, but it is not limited to this and may be an inner rotor type. For example, the motor may be changed to an inner rotor type motor 60 as shown in Figure 7. The motor 60 comprises a stator 61, a rotating shaft 62, and a rotor 63.

[0054] The stator 61 comprises a stator core 64 and a coil 65. The stator 61 is formed in a cylindrical shape overall. The stator core 64 has teeth 66 that extend radially and are arranged in parallel in the circumferential direction. The coil 65 is wound around the teeth 66. The coil 65 will be electrically connected to a power supply (not shown). When a drive current is supplied to the coil 65, the stator 61 generates a rotating magnetic field on its inner circumference.

[0055] The motor 60 is housed in a housing 70. The housing 70 is, for example, a component that forms part of the blower 13. The housing 70 that houses the motor 60 comprises a housing body 71 and an end frame 72. The housing body 71 integrally has a cylindrical side wall portion 73 and a bottom wall portion 74 provided at one axial end of the side wall portion 73. The stator 61 is held inside the side wall portion 73. The end frame 72 is assembled to the housing body 71 so as to close the end of the side wall portion 73 opposite to the bottom wall portion 74. A first bearing 75 is fixed to the end frame 72 and a second bearing 76 is fixed to the bottom wall portion 74. The rotating shaft 62 is rotatably supported by the first bearing 75 and the second bearing 76 with its own axis center as the rotation axis Z.

[0056] The rotor 63 includes, for example, a rotor core 81 fixed to the outer circumferential surface of the rotating shaft 62, and permanent magnets 82 fixed to the rotor core 81. The rotor core 81 is made of, for example, laminated electromagnetic steel sheets. The rotor core 81 is, for example, cylindrical.

[0057] The permanent magnet 82 is formed, for example, in a cylindrical shape and has multiple magnetic poles in the circumferential direction. The permanent magnet 82 is a bonded magnet made by molding and solidifying a magnetic material obtained by mixing magnetic powder with resin. The inner circumferential surface of the permanent magnet 82 is fixed to the outer circumferential surface of the rotor core 81. The permanent magnet 82 is positioned so that its outer circumferential surface faces the inner circumferential surface of the stator 61. In other words, the motor 60 is an inner rotor type motor in which the permanent magnets 82 of the rotor 63 are positioned radially inward of the stator 61.

[0058] The permanent magnet 82 has a first portion 91 and a second portion 92 that occupies an area in the axial direction of the permanent magnet 82 other than the area occupied by the first portion 91. The second portion 92 has an opposing surface 93 that is radially opposed to the inner circumferential surface of the stator core 64. On the other hand, the first portion 91 is provided at a position that is not radially opposed to the stator core 64. In this embodiment, the first portion 91 is provided on the end frame 72 side in the axial direction than the second portion 92. For example, the first portion 91 is provided at the end of the permanent magnet 82 on the end frame 72 side in the axial direction.

[0059] The first portion 91 of the permanent magnet 82 has a first projection 94 that protrudes radially toward the stator 21 side (radially outward in the example shown in Figure 7) than the opposing surface 93 of the second portion 92. The first projection 94 is provided continuously, for example, along the entire circumference of the permanent magnet 82. Because the first portion 91 has the first projection 94, the radial length L1 of the first portion 91 is longer than the radial length L2 of the second portion 92. That is, the permanent magnet 82 is radially thicker in the first portion 91. Therefore, compared to a permanent magnet whose radial length is uniform in the axial direction, the magnetic flux of the permanent magnet 82 is increased in the first portion 91. Note that the radial length L1 of the first portion 91 and the radial length L2 of the second portion 92 are uniform in the axial direction.

[0060] The first protrusion 94 faces the axial end face 64a of the stator core 64 in the axial direction. The direction of remanent magnetization in the range including at least the radial tip 94a of the first protrusion 94 (see arrow in Figure 7) includes a component along the axial direction. In this embodiment, the direction of remanent magnetization over the entire radial direction of the first protrusion 94 includes a component along the axial direction. Furthermore, the direction of remanent magnetization in the range including the radial tip 94a of the first protrusion 94 is along the axial direction. The first protrusion 94 may face the stator core 64 with a gap in between. It is also desirable that the coil 65 is not interposed between the first protrusion 94 and the stator core 64 in the axial direction. That is, it is desirable that the first protrusion 94 faces the stator core 64 without the coil 65 in between.

[0061] The configuration shown in Figure 7 also makes it possible to obtain substantially the same effects as the above embodiment. Specifically, since the permanent magnet 82 is radially thicker at the first portion 91, it is possible to increase the magnetic flux of the permanent magnet 82. As a result, it is possible to increase the output of the motor 60. Furthermore, since the first protrusion 94 of the permanent magnet 82 faces the stator core 64 in the axial direction, the portion facing the permanent magnet 82 and the stator core 64 can be enlarged, which can contribute to an even greater increase in the magnetic flux. In addition, the direction of the remanent magnetization in the range including at least the radial tip portion 94a of the first protrusion 94 includes a component along the axial direction. With this configuration, the amount of magnetic flux directed from the first protrusion 94 to the stator core 64 can be increased more effectively.

[0062] Furthermore, the first portion 91 is located on the end frame 72 side in the axial direction compared to the second portion 92. With this configuration, in an inner rotor type motor 60 in which the permanent magnet 82 is positioned radially inward of the stator 61, the rotor 63 and the stator 61 can be assembled so that the first portion 91 of the permanent magnet 82 does not interfere with the stator 61. In addition, since the permanent magnet 82 is a bonded magnet, it can be manufactured by injection molding. Therefore, the complex shape of the permanent magnet 82 can be easily molded.

[0063] In the permanent magnet 42 of the above embodiment, the first portion 51 may be provided, for example, at the end of the permanent magnet 42 opposite to the top plate 41. Also, in the permanent magnet 82 with the configuration shown in Figure 7, the first portion 91 may be provided, for example, at the end of the permanent magnet 82 opposite to the end frame 72 (the end on the bottom wall portion 74 side).

[0064] The axial lengths of the permanent magnets 42 and 82 may be shorter than the axial lengths of the stator cores 31 and 64. In the permanent magnets 42 and 82, for example, the entire first portion 51 and 91, or only the first protrusions 54 and 94 in the first portion 51 and 91, may be configured separately from the second portion 52 and 92. Also, in the permanent magnet 42 configured as shown in Figures 5 and 6, only the second protrusion 55 may be configured separately from the second portion 52.

[0065] The first protrusions 54, 94 and the second protrusions 55 may be provided, for example, partially in the circumferential direction of the permanent magnets 42, 82. The permanent magnets 42 and 82 may be divided so as to be aligned along the circumferential direction.

[0066] In the above embodiment, the permanent magnets 42 and 82 are bonded magnets containing magnetic powder, but the invention is not limited to this, and may be magnets formed by other manufacturing methods such as sintered magnets. In the above embodiment, the motor 14 is provided in the blower 13 of the indoor unit 11, but it is not limited to this, and may be a motor 14 provided in the blower or compressor of the outdoor unit 12, etc. Also, in the above embodiment, the motor 14 is provided in the refrigeration system 10, but it is not limited to this, and may be a motor 14 used for other purposes.

[0067] Although embodiments of the motors 14 and 60, the blower 13, and the refrigeration device 10 have been described above, it will be understood that various modifications to the form and details are possible without departing from the spirit and scope of the motors 14 and 60, the blower 13, and the refrigeration device 10 as described in the claims. [Explanation of Symbols]

[0068] 10...Refrigeration unit, 13...Blower, 14,60...Motor, 15...Fan, 21,61...Stator, 22,62...Rotating shaft, 23,63...Rotor, 31,64...Stator core, 32,65...Coil, 35...Cover member, 41...Top plate, 42,82...Permanent magnet, 43...Outer peripheral wall, 51,91...First part, 52,92...Second part, 53,93...Opposite surfaces, 54,94...First projection, 54a,94a...Radial tip, 55...Second projection, 70...Housing, 71...Housing body, 72...End frame, 73...Side wall, 74...Bottom wall, L1...Radial length of the first part, L2...Radial length of the second part, Z...Rotation axis.

Claims

1. A rotor (23, 63) having permanent magnets (42, 82) and capable of rotating around a rotation axis (Z), A stator (21, 61) having stator cores (31, 64) radially opposite to the permanent magnet, and coils (32, 65) attached to the stator core, A motor (14, 60) equipped with, The permanent magnet has a first portion (51, 91) and a second portion (52, 92) that occupies an area other than the area occupied by the first portion in the axial direction of the permanent magnet. The radial length (L1) of the first portion is longer than the radial length (L2) of the second portion. Motor.

2. The second portion has opposing surfaces (53, 93) that are radially opposite to the stator core, The first part is, It is provided at a position that does not face the stator core in the radial direction, In the radial direction, it has first protrusions (54, 94) that protrude toward the stator side than the opposing surface, The motor according to claim 1.

3. The first protrusion is axially opposed to the stator core. The motor according to claim 2.

4. The direction of the remanent magnetization of the first protrusion includes a component along the axial direction. The motor according to claim 3.

5. The direction of the remanent magnetization in the range including at least the radial tip portions (54a, 94a) of the first projection includes a component along the axial direction. The motor according to claim 4.

6. The permanent magnet is positioned radially outward of the stator. The first portion has a second projection (55) that protrudes radially outward from the second portion in the radial direction. The motor according to claim 1.

7. The first portion is radially opposed to the stator core, The motor according to claim 6.

8. The rotor comprises a top plate (41) fixed to the rotating shaft (22) and holding the permanent magnet, and an outer peripheral wall (43) fixed to the top plate and located radially outward of the permanent magnet, The stator includes a cover member (35) positioned between the permanent magnet and the outer peripheral wall. The second projection is axially opposed to the cover member. The motor according to claim 6.

9. The permanent magnet is positioned radially outward of the stator. The rotor has a top plate (41) that is fixed to the rotating shaft (22) and holds the permanent magnet, The first portion is located on the top plate side in the axial direction compared to the second portion. The motor according to claim 1.

10. The motor is housed in the housing (70), The housing comprises a housing body (71) having a cylindrical side wall portion (73) and a bottom wall portion (74) provided at one axial end of the side wall portion, and an end frame (72) that closes the end of the side wall portion opposite to the bottom wall portion. The stator is held inside the side wall portion, The permanent magnet is positioned radially inward of the stator. The first portion is located on the end frame side of the second portion in the axial direction. The motor according to claim 1.

11. The aforementioned permanent magnet is a bonded magnet. The motor according to claim 1.

12. A motor according to any one of claims 1 to 11, The system includes a fan (15) driven by the aforementioned motor, Blower.

13. A motor comprising the motor described in any one of claims 1 to 11, Refrigeration equipment.

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