Rotors, motors, blowers, and refrigeration systems

Abstract

The present invention provides a rotor that can suppress magnetic field reduction in a motor having a vibration suppression mechanism. [Solution] The rotor 40 of the motor 20 comprises a cylindrical bonded magnet 50 containing magnetic powder and a support member 21 that supports the bonded magnet 50. The bonded magnet 50 has a first magnet portion 51 made of a first bonded magnet material and a second magnet portion 52 made of a second bonded magnet material. The second bonded magnet material has a lower elastic modulus than the first bonded magnet material. The second magnet portion 52 is positioned between the first magnet portion 51 and the support member 21.

Description

Technical Field

[0006] , ,

[0005] , , ,

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

Background Art

[0002] Patent Document 1 discloses a motor in which an elastic body is provided between the rotating shaft of the motor and the rotor. The elastic body in Patent Document 1 suppresses the transmission of vibration from the rotor to the rotating shaft of the motor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When there are restrictions on the size of the motor, in order to provide an elastic body to the motor, it is necessary to reduce the size of the rotor. However, when the size of the rotor becomes small, the performance of the motor may deteriorate. Therefore, in a motor having a mechanism for suppressing vibration, a rotor capable of suppressing a decrease in magnetic force is required.

Means for Solving the Problems

[0005] The rotor according to the first aspect for solving the above problems is a rotor of a motor, and includes a cylindrical bonded magnet containing magnetic powder and a support member for supporting the bonded magnet. The bonded magnet has a first magnet portion made of a first bonded magnet material and a second magnet portion made of a second bonded magnet material. The second bonded magnet material has a smaller elastic modulus than the first bonded magnet material, and the second magnet portion is disposed between the first magnet portion and the support member.

[0006] With the above configuration, the rotor can suppress the decrease in magnetic force of the rotor by having a second magnet section with a lower elastic modulus than the first magnet section.

[0007] In the rotor of the second view, the second bonded magnetic material includes an elastomer, as in the rotor of the first view.

[0008] With the above configuration, since the second magnet section is made of a second bonded magnet material containing an elastomer, the rotor can effectively suppress vibrations.

[0009] The rotor in the third aspect is the rotor in the first or second aspect, wherein the first bonded magnet material includes magnetic powder having magnetic anisotropy, and the second bonded magnet material includes magnetic powder having magnetic anisotropy.

[0010] According to the above configuration, since the first bonded magnet material and the second bonded magnet material contain magnetic powder having magnetic anisotropy, the overall magnetic force of the bonded magnet can be increased.

[0011] The rotor in the fourth view is such that, in any one of the rotors in the first to third views, the support member is a rotating shaft that rotates around the central axis of the rotor, and the second magnet portion is positioned in the radial direction of the rotating shaft between the inner surface of the first magnet portion and the outer surface of the rotating shaft.

[0012] According to the above configuration, the second magnet section is positioned between the first magnet section and the rotating shaft, thereby effectively suppressing motor vibrations.

[0013] The rotor of the fifth viewpoint, in any one of the rotors of the first to third viewpoints, has a top plate positioned at one end of the bonded magnet in a direction along the central axis of the rotor, and the second magnet portion is positioned between the first magnet portion and the top plate.

[0014] According to the above configuration, the second magnet section is positioned between the first magnet section and the top plate, thereby effectively suppressing vibrations.

[0015] The rotor of the sixth aspect, in any one of the rotors of the first to fifth aspects, the first magnet portion has two or more magnetic poles adjacent to each other in the circumferential direction of the bonded magnet.

[0016] According to the above configuration, the first magnet portion can generate a suitable magnetic force by two or more magnetic poles adjacent to each other in the circumferential direction of the bonded magnet.

[0017] The motor of the seventh aspect includes any one rotor of the first to sixth aspects and a stator.

[0018] According to the above configuration, the motor can suppress a decrease in performance and suppress vibration by the rotor.

[0019] The blower of the eighth aspect includes the motor of the seventh aspect and a fan portion driven by the motor.

[0020] According to the above configuration, the blower can blow air suitably by the motor.

[0021] The refrigeration device of the ninth aspect includes the motor of the seventh aspect.

[0022] According to the above configuration, the refrigeration device can improve energy utilization efficiency by the motor.

Brief Description of the Drawings

[0023] [Figure 1] It is a schematic diagram of an indoor unit for a refrigeration device according to the first embodiment. [Figure 2] It is a cross-sectional view showing the motor and the fan of the indoor unit for the refrigeration device of FIG. 1. [Figure 3] It is a cross-sectional view of the rotor of the motor of FIG. 2. [Figure 4] It is a cross-sectional view of a mold body for manufacturing the bonded magnet of FIG. 3. [Figure 5] It is a cross-sectional view showing a first movable part moving step of moving the first movable part toward the mold body of FIG. 4. [Figure 6]This is a cross-sectional view showing the second movable part movement process, in which the second movable part is moved toward the mold body shown in Figure 4. [Figure 7] This is a cross-sectional view showing the motor and fan of the second embodiment. [Figure 8] Figure 7 is an enlarged cross-sectional view of a portion of the rotor. [Modes for carrying out the invention]

[0024] <First Embodiment> Referring to Figures 1 to 6, the rotor 40 of the motor 20, the motor 20, the blower 10, and the refrigeration system of the first embodiment will be described.

[0025] The refrigeration system includes a motor 20. Examples of refrigeration systems include an air conditioner, a water heater, a chiller unit, and a cooling device for cooling the air inside the storage area. The air conditioner is either a dedicated refrigeration unit, a dedicated heating unit, or a heating and cooling unit that can switch between cooling and heating. The air inside the storage area is the air inside refrigerators, freezers, display cases, and containers. In this embodiment, the refrigeration system will be described as an air conditioner.

[0026] Figure 1 shows the indoor unit 1 of an air conditioner. In this embodiment, the motor 20 is provided in the indoor unit 1. The indoor unit 1 is, for example, a wall-mounted type that is attached to the wall of a room. The indoor unit 1 is connected to the outdoor unit of the air conditioner by refrigerant piping.

[0027] The indoor unit 1 includes a heat exchanger that exchanges heat with the air drawn in from the intake port, a blower 10, and a casing 2 that supports the heat exchanger and the blower 10. The heat exchanger and the blower 10 are arranged in the internal space of the casing 2.

[0028] The blower 10 comprises a motor 20 and a fan unit 11 driven by the motor 20. The fan unit 11 is located downstream of the heat exchanger in the airflow path from the intake port to the outlet port of the indoor unit 1. The fan unit 11 is a propeller fan, a centrifugal fan, or a cross-flow fan. Examples of centrifugal fans include turbo fans and sirocco fans. In this embodiment, the fan unit 11 is a cross-flow fan.

[0029] <motor> As shown in Figure 2, the motor 20 is, for example, an inner rotor type motor. The motor 20 comprises a rotor 40 and a stator 30.

[0030] The stator 30 has a stator core 31 and a coil 32. These components constituting the stator 30 are integrally molded by resin molding.

[0031] The stator core 31 is formed by laminating conductive steel plates. The steel plates are soft magnetic materials. The stator core 31 has multiple teeth. The coil 32 is formed by winding wire around the teeth of the stator core 31. The winding wire is copper wire or aluminum wire. The winding wire is covered with an insulating material such as enamel resin.

[0032] An insulator is provided between the stator core 31 and the coil 32. The insulator is made of an insulating resin material. The insulator insulates the stator core 31 and the coil 32 so that the current flowing through the coil 32 is not transmitted to the stator core 31.

[0033] The rotor 40 of the motor 20 comprises a cylindrical bonded magnet 50 containing magnetic powder and a support member 21 that supports the bonded magnet 50. In this embodiment, the support member 21 is a rotating shaft 22 that rotates around the central axis C1 of the rotor 40. The bonded magnet 50 has a through hole 50X in which the rotating shaft 22 is positioned. The rotating shaft 22 is positioned in the through hole 50X so as to rotate integrally with the bonded magnet 50. Details of the bonded magnet 50 will be described later.

[0034] The motor 20 further comprises a Boscore 23. The Boscore 23 is provided to increase the contact area between the bonded magnet 50 and the rotating shaft 22. The Boscore 23 is provided between the bonded magnet 50 and the rotating shaft 22 in the radial direction of the rotor 40. The Boscore 23 is cylindrical. The Boscore 23 has a through hole 23A into which the rotating shaft 22 is inserted. The rotating shaft 22 is, for example, press-fitted into the through hole 23A of the Boscore 23. The Boscore 23 is formed of a metallic material.

[0035] <Bonded Magnets> The bonded magnet 50 will be described with reference to Figures 2 and 3. The bonded magnet 50 has two or more adjacent magnetic poles in the circumferential direction of the bonded magnet 50. The bonded magnet 50 is an anisotropic magnet. The bonded magnet 50 includes an outer circumferential surface 50A and an inner circumferential surface 50B in the radial direction of the bonded magnet 50. The magnetic poles of the bonded magnet 50 are provided on either the outer circumferential surface 50A or the inner circumferential surface 50B in the radial direction of the bonded magnet 50. In this embodiment, the magnetic poles of the bonded magnet 50 are provided on the outer circumferential surface 50A of the bonded magnet 50.

[0036] The bonded magnet 50 has a first magnetic portion 51 and a second magnetic portion 52. The first magnetic portion 51 has two or more adjacent magnetic poles in the circumferential direction of the bonded magnet 50. The first magnetic portion 51 includes the central part of the magnetic poles of the bonded magnet 50. The first magnetic portion 51 is arranged on the outer circumferential surface 50A or the inner circumferential surface 50B of the bonded magnet 50. In this embodiment, the first magnetic portion 51 is arranged on the outer circumferential surface 50A of the bonded magnet 50. The second magnetic portion 52 is arranged on the outer circumferential surface 50A or the inner circumferential surface 50B of the bonded magnet 50. In this embodiment, the second magnetic portion 52 is arranged on the inner circumferential surface 50B of the bonded magnet 50.

[0037] The second magnet portion 52 is adjacent to the first magnet portion 51. The second magnet portion 52 is positioned between the first magnet portion 51 and the support member 21. In this embodiment, the second magnet portion 52 is positioned between the first magnet portion 51 and the rotating shaft 22. The second magnet portion 52 is positioned in the radial direction of the rotating shaft 22 between the inner surface 51A of the first magnet portion 51 and the outer surface 22A of the rotating shaft 22. In this embodiment, the second magnet portion 52 is positioned in the radial direction of the rotating shaft 22 between the inner surface 51A of the first magnet portion 51 and the outer surface 23B of the Boscore 23.

[0038] The first magnet section 51 is made of a first bonded magnet material. The second magnet section 52 is made of a second bonded magnet material. Each of the first bonded magnet material and the second bonded magnet material contains magnetic powder having magnetic anisotropy. The magnetic powder has an easy magnetization axis. The length of the magnetic powder in a second direction perpendicular to the easy magnetization axis is longer than the length in a first direction along the easy magnetization axis. The magnetic powder has a flattened shape. The magnetic powder is in the form of fine powder or granules. The magnetic powder is ferrite magnetic powder or rare earth magnetic powder. The rare earth magnetic powder includes NdFeB-based magnetic powder or SmCo-based magnetic powder.

[0039] The first bonded magnet material includes a first binder. The first binder includes nylon resin and PPS (Polyphenylene Sulfide) resin, etc. Examples of nylon resins include nylon 12, nylon 6, nylon 6,6, nylon 11, nylon 6,12, nylon 6,10, nylon 6,66, nylon MXD6, etc. Various nylon resins may be used individually as the first binder, or multiple types may be used in mixtures.

[0040] The second bonded magnetic material includes a second binder. The second binder includes a material with a low modulus of elasticity. The second binder includes an elastomer. The elastomer includes rubber, thermosetting elastomers, and thermoplastic elastomers.

[0041] The second bonded magnet material has a lower elastic modulus than the first bonded magnet material. In other words, the second bonded magnet material is more easily deformed than the first bonded magnet material.

[0042] The magnetic particle density of the first bonded magnet material is higher than that of the second bonded magnet material, or the fluidity of the first binder is higher than that of the second binder. Therefore, the first magnet section 51 has a greater magnetic force than the second magnet section 52. The magnetic particle density can be confirmed, for example, by observing the surface of the bonded magnet 50 using a scanning electron microscope (SEM).

[0043] The first magnet portion 51 has a first width W1 in the radial direction of the rotation axis 22. The second magnet portion 52 has a second width W2 in the radial direction of the rotation axis 22. The first width W1 is larger than the second width W2. Because the first width W1 is larger than the second width W2, the volume of the first magnet portion 51 per unit volume of the bonded magnet 50 is larger than the volume of the second magnet portion 52 per unit volume of the bonded magnet 50. Therefore, the proportion of the bonded magnet 50 occupied by the first magnet portion 51 is larger, and thus the overall magnetic force of the bonded magnet 50 can be improved.

[0044] <Method for manufacturing bonded magnets> The manufacturing method of the bonded magnet 50 will be described with reference to Figures 4 to 6.

[0045] The bonded magnet 50 is formed by a mold 60. The mold 60 comprises a mold body 61. The mold body 61 is made of a non-magnetic material. The non-magnetic material is, for example, non-magnetic stainless steel. The mold body 61 has a cylindrical cavity 62. In plan view, the cavity 62 is annular. Bonded magnet material is injected into the cavity 62 from an injection port. The injection port is provided on the end face of the cavity 62 in the direction CD in the cylindrical axis direction. The end face of the cavity 62 in the direction CD in the cylindrical axis direction is annular. The injection port is provided on the mold body 61 so as to correspond to the center of the magnetic pole of the magnetic field generating unit 65, which will be described later.

[0046] As shown in Figure 4, the cavity 62 has a first region 63 and a second region 64 in a cross section perpendicular to the cylindrical axis CD of the cavity 62. The dashed line in Figure 4 is a virtual line to distinguish the first region 63 and the second region 64. The second region 64 is a region different from the first region 63 in the radial direction of the cavity 62. In the radial direction of the cavity 62, the length of the first region 63 is longer than the length of the second region 64. The first region 63 is adjacent to the second region 64 in the radial direction.

[0047] The mold 60 includes a magnetic field generating unit 65 that generates a magnetic field within the cavity 62. The magnetic field generating unit 65 has magnetic poles arranged in a circumferential direction. On the outer circumference of the magnetic field generating unit 65, the south poles and north poles are arranged alternately in the circumferential direction. The number of magnetic poles of the bonded magnet 50 corresponds to the number of magnetic poles of the magnetic field generating unit 65. In this embodiment, the number of magnetic poles of the magnetic field generating unit 65 is 10. The number of magnetic poles of the magnetic field generating unit 65 is not limited to 10. The magnetic field generating unit 65 may have as many as 2 or more even natural number magnetic poles.

[0048] The cavity 62 has an outward surface 62A and an inward surface 62B in the radial direction of the cavity 62. The magnetic field generating unit 65 is positioned on either the outward surface 62A side or the inward surface 62B side of the cavity 62 in the radial direction. In this embodiment, the magnetic field generating unit 65 is positioned on the outward surface 62A side of the cavity 62.

[0049] The first region 63 faces the center of the magnetic pole of the magnetic field generating unit 65 in the radial direction of the cavity 62. The distance from the magnetic field generating unit 65 to the second region 64 is longer than the distance from the magnetic field generating unit 65 to the first region 63. The distance from the center of the magnetic pole of the magnetic field generating unit 65 to the second region 64 is longer than the distance from the center of the magnetic pole of the magnetic field generating unit 65 to the first region 63. In this embodiment, the distance from the center of the magnetic pole of the magnetic field generating unit 65 to the inner surface of the second region 64 is longer than or equal to the distance from the center of the magnetic pole of the magnetic field generating unit 65 to the outer surface of the first region 63. The magnetic field generating unit 65 is adjacent to the first region 63 in the radial direction of the cavity 62.

[0050] The magnetic particles contained in the first bonded magnet material and the second bonded magnet material are oriented by the orientation magnetic field of the magnetic field generating unit 65. In this embodiment, orientation means that the easy magnetization axis of the magnetic particles contained in the bonded magnet material is aligned in a predetermined direction.

[0051] As shown in Figures 5 and 6, the mold 60 includes a movable part 66 configured to move relative to the mold body 61. The movable part 66 has an injection port 66A and a runner 66B. Bonded magnet material is injected into the injection port 66A. The runner 66B is arranged in the movable part 66, for example, so as to spread radially. The movable part 66 is configured to move relative to the mold body 61 so that the runner 66B is positioned to correspond to the injection port of the cavity 62. The bonded magnet material injected from the injection port 66A is injected into the cavity 62 through the runner 66B and the injection port.

[0052] The movable part 66 includes a first movable part 67 for injecting the first bond magnet material into the first region 63 of the cavity 62, and a second movable part 68 for injecting the second bond magnet material into the second region 64 of the cavity 62. A bond magnet 50 is formed by swapping the first movable part 67 and the second movable part 68 and injecting each bond magnet material into the cavity 62.

[0053] The first movable part 67 has a first movable part body 67A and a region partition 67B. The region partition 67B is provided on the lower end surface 67C of the first movable part body 67A. The region partition 67B may be detachably attached to the first movable part body 67A. In plan view, the region partition 67B is annular. The region partition 67B is formed of, for example, a soft magnetic material.

[0054] The region partition 67B is provided on the first movable part body 67A so as to correspond to the first region 63 or the second region 64 of the cavity 62. In this embodiment, the region partition 67B is provided on the first movable part body 67A so as to correspond to the second region 64 of the cavity 62. The runner 66B of the first movable part 67 is provided on the first movable part 67 so as to correspond to the first region 63. The runner 66B of the second movable part 68 is provided on the second movable part 68 so as to correspond to the second region 64.

[0055] The steps of the manufacturing method for the bonded magnet 50 will now be described. The manufacturing method for the bonded magnet 50 includes a first movable part movement step. In the first movable part movement step, the first movable part 67 is moved toward the mold body 61, thereby closing the molding die 60.

[0056] The manufacturing method for the bonded magnet 50 includes a first injection step of injecting a first bonded magnet material into a first region 63 of the cavity 62. The first injection step is a step for injection molding the first magnet portion 51 of the bonded magnet 50. In the first injection step, when the first bonded magnet material is injected from the injection port 66A of the first movable portion 67, it is injected from the injection port through the runner 66B into the first region 63 of the cavity 62. In the first injection step, the first bonded magnet material flows in a direction toward downward from the injection port and in a direction spreading in the circumferential direction, thereby filling the first region 63 of the cavity 62 with the first bonded magnet material.

[0057] The manufacturing method for the bonded magnet 50 includes a first separation step in which the first movable part 67 is moved away from the mold body 61. The first separation step is performed after the completion of the first injection step and after the first bonded magnet material has hardened. The first separation step separates the first bonded magnet material injected into the first region 63 of the cavity 62 from the first bonded magnet material in the runner 66B.

[0058] The manufacturing method for the bonded magnet 50 includes a second movable part movement step. In the second movable part movement step, the second movable part 68 is moved toward the mold body 61, thereby closing the molding die 60.

[0059] The manufacturing method for the bonded magnet 50 includes a second injection step of injecting a second bonded magnet material into a second region 64 of the cavity 62. The second injection step is a step for injection molding the second magnet portion 52 of the bonded magnet 50. In the second injection step, when the second bonded magnet material is injected from the injection port 66A of the second movable portion 68, it is injected from the injection port through the runner 66B into the second region 64 of the cavity 62. In the second injection step, the second bonded magnet material flows in a direction toward downward from the injection port and in a direction spreading in the circumferential direction, thereby filling the second region 64 of the cavity 62 with the second bonded magnet material.

[0060] The manufacturing method for the bonded magnet 50 includes a second separation step in which the second movable part 68 is moved away from the mold body 61. The second separation step is performed after the completion of the second injection step and after the second bonded magnet material has hardened. The second separation step separates the second bonded magnet material injected into the second region 64 of the cavity 62 from the second bonded magnet material in the runner 66B.

[0061] The method for manufacturing the bonded magnet 50 further comprises an extraction step in which the bonded magnet 50 is removed from the cavity 62. The extraction step is performed after the second bonded magnet material has hardened in the second injection step. The method for manufacturing the bonded magnet 50 further comprises a magnetization step in which the bonded magnet 50 is magnetized. The magnetization step is performed after the second injection step. Preferably, the magnetization step is performed after the extraction step.

[0062] In this embodiment, the first movable part movement step, the first injection step, and the first detachment step are performed before the second movable part movement step, the second injection step, and the second detachment step. Therefore, the magnetic powder of the first bonded magnet material injected into the first region 63 by the magnetic field generating unit 65 can be suitably oriented.

[0063] <Operation of the First Embodiment> The operation of the first embodiment will now be explained. In the first embodiment, a second magnet portion 52, which has a lower elastic modulus than the first magnet portion 51, is positioned radially between the first magnet portion 51 and the rotating shaft 22 of the bonded magnet 50. Therefore, it is possible to suppress the transmission of vibrations of the bonded magnet 50, caused by electromagnetic force acting on the bonded magnet 50, to the rotating shaft 22.

[0064] <Effects of the First Embodiment> The effects of the first embodiment will be explained. (1-1) The rotor 40 of the motor 20 comprises a cylindrical bonded magnet 50 containing magnetic powder and a support member 21 that supports the bonded magnet 50. The bonded magnet 50 has a first magnet portion 51 made of a first bonded magnet material and a second magnet portion 52 made of a second bonded magnet material. The second bonded magnet material has a lower elastic modulus than the first bonded magnet material. The second magnet portion 52 is positioned between the first magnet portion 51 and the support member 21.

[0065] With the above configuration, the rotor 40 can suppress the decrease in magnetic force of the rotor 40 by the second magnet portion 52, which has a lower elastic modulus than the first magnet portion 51. Furthermore, with the above configuration, the rotor 40 can suppress the decrease in magnetic force of the rotor 40 and also suitably suppress vibration of the motor 20.

[0066] (1-2) The second bonded magnetic material contains an elastomer.

[0067] With the above configuration, since the second magnet section 52 is made of a second bonded magnet material containing an elastomer, the rotor 40 can effectively suppress vibrations.

[0068] (1-3) The first bonded magnet material contains magnetic powder having magnetic anisotropy. The second bonded magnet material contains magnetic powder having magnetic anisotropy.

[0069] According to the above configuration, since the first bonded magnet material and the second bonded magnet material contain magnetic powder having magnetic anisotropy, the overall magnetic force of the bonded magnet 50 can be increased.

[0070] (1-4) The support member 21 is a rotating shaft 22 that rotates around the central axis C1 of the rotor 40. The second magnet portion 52 is positioned in the radial direction of the rotating shaft 22 between the inner surface 51A of the first magnet portion 51 and the outer surface 22A of the rotating shaft 22.

[0071] With the above configuration, the second magnet section 52 is positioned between the first magnet section 51 and the rotating shaft 22, thereby effectively suppressing vibrations of the motor 20.

[0072] (1-5) The first magnet section 51 has two or more magnetic poles adjacent to each other in the circumferential direction of the bonded magnet 50.

[0073] According to the above configuration, the first magnet section 51 can generate a suitable magnetic force using two or more magnetic poles adjacent to each other in the circumferential direction of the bonded magnet 50.

[0074] (1-6) The motor 20 comprises a rotor 40 and a stator 30.

[0075] With the above configuration, the motor 20 can suppress performance degradation and vibration thanks to the rotor 40.

[0076] (1-7) The blower 10 comprises a motor 20 and a fan section 11 driven by the motor 20.

[0077] With the above configuration, the blower 10 can effectively blow air using the motor 20.

[0078] (1-8) The refrigeration system is equipped with a motor 20.

[0079] According to the above configuration, the refrigeration system can improve its energy utilization efficiency with the motor 20.

[0080] <Second Embodiment> Referring to Figures 1, 7, and 8, the rotor 80 of the motor 70, the motor 70, the blower 10, and the refrigeration system of the second embodiment will be described. Components in this embodiment that are common to the first embodiment are denoted by the same reference numerals as in the first embodiment, and redundant explanations are omitted.

[0081] The refrigeration unit includes a motor 70. The blower 10 includes a motor 70 and a fan unit 11 driven by the motor 70.

[0082] <motor> Motor 70 is, for example, an outer rotor type motor. Motor 70 comprises a rotor 80 and a stator 90.

[0083] The stator 90 has a stator core 91 and a coil 92. These components constituting the stator 90 are integrally molded using resin molding.

[0084] The stator core 91 is formed by laminating conductive copper plates. The copper plates are soft magnetic materials. The stator core 91 has multiple teeth. The coil 92 is formed by winding copper wire around the teeth of the stator core 91. The copper wire is covered with an insulating material such as enamel resin.

[0085] An insulator is provided between the stator core 91 and the coil 92. The insulator is made of an insulating resin material. The insulator insulates the stator core 91 and the coil 92 so that the current flowing through the coil 92 is not transmitted to the stator core 91. Connection plates are connected to the lead wires at the beginning and end of the copper winding of the coil 92. The connection plates are connected to an external power supply, etc., via lead wires.

[0086] The motor 70 further comprises a shaft member 71. The shaft member 71 rotates integrally with the rotor 80. The stator 90 has a through hole 93 in which the shaft member 71 is positioned. At least one bearing 72 is positioned in the through hole 93. The bearing 72 supports the shaft member 71 so that it rotates relative to the stator 90. The rotor 80 is attached to one end of the shaft member 71. In this embodiment, the shaft member 71 is supported by two bearings 72 so as to be rotatable relative to the stator 90. A fan section 11 is attached to one end of the shaft member 71.

[0087] The rotor 80 comprises a cylindrical bonded magnet 50 containing magnetic powder and a support member 21 that supports the bonded magnet 50. In this embodiment, the support member 21 has a top plate 81.

[0088] The bonded magnet 50 includes a first magnetic portion 51 and a second magnetic portion 52. The magnetic poles of the bonded magnet 50 are provided on the inner circumferential surface 50B of the bonded magnet 50. The first magnetic portion 51 includes the central part of the magnetic pole of the bonded magnet 50.

[0089] The top plate 81 is positioned on one end 50C of the bonded magnet 50 in a direction along the central axis C2 of the rotor 80. The top plate 81 is annular when viewed from the axial direction of the motor 70. The top plate 81 extends in a direction perpendicular to the axial direction of the motor 70. The top plate 81 has a through hole 81A. A shaft member 71 is positioned in the through hole 81A. The shaft member 71 is attached to the through hole 81A so as to rotate integrally with the top plate 81.

[0090] The rotor 80 has bonded magnet support portions 82. The bonded magnet support portions 82 extend from each end of the top plate 81 in a direction perpendicular to the axial direction of the motor 70, toward the axial direction of the motor 70.

[0091] In the bonded magnet support section 82, a bonded magnet 50 is provided on the part opposite to the top plate 81. The inner circumferential surface 50B of the bonded magnet 50 is smoothly connected to the inner circumferential surface 82A of the bonded magnet support section 82.

[0092] The second magnet portion 52 of the bonded magnet 50 is positioned between the first magnet portion 51 and the top plate 81. In this embodiment, the second magnet portion 52 is positioned between the first magnet portion 51 and the top plate 81 so that the first magnet portion 51 and the top plate 81 do not come into contact. The constituent material and elastic properties of the first magnet portion 51 are the same as in the first embodiment. Similarly, the constituent material and elastic properties of the second magnet portion 52 are the same as in the first embodiment. Specifically, the second bonded magnet material of the second magnet portion 52 has a lower elastic modulus than the first bonded magnet material of the first magnet portion 51.

[0093] <Effects of the second embodiment> The effects of the second embodiment will be explained. (2-1) The support member 21 has a top plate 81 positioned on one end 50C of the bonded magnet 50 in a direction along the central axis C2 of the rotor 80. The second magnet portion 52 is positioned between the first magnet portion 51 and the top plate 81.

[0094] With the above configuration, the second magnet section 52 can effectively suppress vibrations by being positioned between the first magnet section 51 and the top plate 81.

[0095] <Example of changes> The motor rotor, motor, blower, and refrigeration system of the present disclosure may also be in forms other than those described above, for example, the modifications shown below and combinations of at least two non-inconsistent modifications.

[0096] • Boscore 23 may be omitted.

[0097] The Boscore 23 may be formed by a first bonded magnet member or a second bonded magnet member. In this modified example, three layers of bonded magnets are arranged around the axis of the rotating shaft 22.

[0098] The second magnet section 52 may have multiple protrusions between the rotating shaft 22 and the second magnet section 52. In this modified example, the multiple protrusions reduce the contact area between the Boscore 23 and the second magnet section 52, thereby further suppressing the transmission of vibrations of the bonded magnet 50, caused by electromagnetic force acting on the bonded magnet 50, to the rotating shaft 22.

[0099] The second binder may be made of nylon resin, PPS resin, or the like, similar to the first binder. When the second binder is made of the same material as the first binder, the magnetic particle density of the second bonded magnet material is smaller than that of the first bonded magnet material.

[0100] • The first width W1 may be smaller than the second width W2. In this modified example, the volume of the first magnet part 51 per unit volume of the bonded magnet 50 is smaller than the volume of the second magnet part 52 per unit volume of the bonded magnet 50. Therefore, the transmission of vibrations of the bonded magnet 50 caused by electromagnetic force acting on the bonded magnet 50 to the rotating shaft 22 can be further suppressed.

[0101] In the rotor 80 of the second embodiment, the shaft member 71 may be configured not to rotate.

[0102] The second movable part movement step, the second injection step, and the second detachment step may be performed before the first movable part movement step, the first injection step, and the first detachment step.

[0103] The magnetization process may be omitted. In this case, for example, the bonded magnet 50 is magnetized by the magnetic field generating unit 65.

[0104] The motor 20 may be used in an outdoor unit for a refrigeration system or in a compressor for a refrigeration system.

[0105] While embodiments of the motor rotor, motor, blower, and refrigeration system have been described above, it should be understood that various modifications to the form and details are possible without departing from the spirit and scope of the motor rotor, motor, blower, and refrigeration system described in the claims. [Explanation of Symbols]

[0106] 10... Blower, 11... Fan section, 20... Motor, 21... Support member, 22... Rotating shaft, 22A... Outer surface, 30... Stator, 40... Rotor, 50... Bonded magnet, 50C... End, 51... First magnet section, 51A... Inner surface, 52... Second magnet section, 70... Motor, 80... Rotor, 81... Top plate, 90... Stator.

Claims

1. The rotor (40) of the motor (20), A cylindrical bonded magnet (50) containing magnetic powder, The device comprises a support member (21) that supports the bonded magnet (50), The bonded magnet (50) is A first magnet part (51) made of a first bonded magnet material, It has a second magnetic part (52) made of a second bonded magnetic material, The second bonded magnet material has a lower elastic modulus than the first bonded magnet material. The second magnet portion (52) is positioned between the first magnet portion (51) and the support member (21). Rotor.

2. The second bonded magnetic material includes an elastomer. The rotor according to claim 1.

3. The first bonded magnet material includes the magnetic powder having magnetic anisotropy, The second bonded magnet material includes the magnetic powder having magnetic anisotropy, The rotor according to claim 1.

4. The support member (21) is a rotating shaft (22) that rotates around the central axis (C1) of the rotor (40), The second magnet portion (52) is positioned in the radial direction of the rotation shaft (22) between the inner surface (51A) of the first magnet portion (51) and the outer surface (22A) of the rotation shaft (22). The rotor according to claim 1.

5. The support member (21) has a top plate (81) positioned at one end (50C) of the bonded magnet (50) in a direction along the central axis (C2) of the rotor (80), The second magnet portion (52) is positioned between the first magnet portion (51) and the top plate (81). The rotor according to claim 1.

6. The first magnetic portion (51) has two or more magnetic poles adjacent to each other in the circumferential direction of the bonded magnet (50). The rotor according to claim 1.

7. A motor (20), A rotor (40) according to any one of claims 1 to 6, A stator (30) and a stator (30) are provided. Motor.

8. A blower (10), The motor (20) according to claim 7, The system comprises a fan section (11) driven by the motor (20), Blower.

9. A refrigeration device, The motor (20) according to claim 7 is provided, Refrigeration equipment.

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