Motors, blowers, and refrigeration equipment

Abstract

This invention provides a motor that can reduce noise caused by rotor resonance using only the motor itself. [Solution] The motor comprises a stator and a rotor having a permanent magnet 92 that rotates around a rotation axis. The permanent magnet 92 has an annular portion 94 having multiple magnetic poles in the circumferential direction, and the annular portion 94 has a first rigid portion 100 and a second rigid portion 110 in the circumferential direction. The first rigid portion 100 is made of a magnetic material and has a constant rigidity per unit length in the circumferential direction, while the second rigid portion 110 has different rigidity from the first rigid portion 100 due to differences in the material it is made of, its radial length, or its axial length. The annular portion 94 is provided with a number of second rigid portions 110 that is different from the number of magnetic poles, or with two or more second rigid portions 110 that are spaced unevenly apart in the circumferential direction, or with two or more second rigid portions 110 that have different rigidities.

Description

Technical Field

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

Background Art

[0002] Conventionally, as a rotor in a motor, there is a structure including a bottomed cylindrical yoke and a permanent magnet fixed to the inner peripheral surface of the yoke, and a driven member is fixed to the yoke (see, for example, Patent Document 1). In this example, the legs of the driven member are formed at unequal intervals in the circumferential direction and are joined to the yoke at the positions of the unequal intervals. In this configuration, the rigidity of the outer peripheral portion of the yoke becomes non-uniform, and noise based on the resonance of the rotor can be reduced.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, since the driven member is not originally a component of the motor, for example, in order to enhance the versatility of the motor, a configuration that can reduce noise with the motor alone is desired. An object of the present disclosure is to provide a motor, a blower, and a refrigeration device capable of reducing noise based on the resonance of a rotor with the motor alone.

Means for Solving the Problems

[0005] A motor in the first aspect of solving this problem comprises a stator and a rotor having a permanent magnet and rotating about a rotation axis, wherein the permanent magnet has an annular portion having a plurality of magnetic poles in the circumferential direction, the annular portion has a first rigid portion and a second rigid portion in the circumferential direction, the first rigid portion is made of a magnetic material and has a radial length of a first length and an axial length of a second length so that the rigidity per unit length in the circumferential direction is constant, the second rigid portion has a different rigidity from the first rigid portion because the material it is made of, or the radial length or the axial length is different from the first rigid portion, the annular portion has a number of second rigid portions different from the number of magnetic poles, or two or more second rigid portions are provided at unequal intervals in the circumferential direction, or two or more second rigid portions with different rigidities are provided.

[0006] With this configuration, the resonant frequency of the annular section can be shifted relative to the frequency of the electromagnetic excitation force by the configuration of the permanent magnets. Therefore, noise based on rotor resonance can be reduced with the motor alone.

[0007] In the motor from the second perspective, the annular portion is provided with the second rigid portion at equal intervals in the circumferential direction, compared to the motor from the first perspective. This configuration makes it possible to reduce the weight imbalance of the annular section compared to, for example, the case where the second rigid section is provided at unequal intervals in the circumferential direction.

[0008] The motor according to the third perspective is the motor according to the second perspective, wherein the annular portion is provided with the same number of second rigid parts as the number of magnetic poles, and two or more of the second rigid parts have different rigidities due to differences in the material they are made of, their radial length, or their axial length.

[0009] With this configuration, the second rigid parts are provided at equal intervals in the circumferential direction and in the same number as the number of magnetic poles. For example, the second rigid parts can be placed at each boundary between magnetic poles. This makes it possible to uniformly increase the magnetic force of each magnetic pole.

[0010] The motor of the fourth aspect is that, in the motor of the second aspect, the annular portion is provided with a number of second rigid parts different from the number of magnetic poles, and all of the plurality of second rigid parts have equal rigidity because the constituent material, radial length, and axial length are equal.

[0011] With this configuration, the second rigid parts are provided at equal intervals in the circumferential direction, in a number different from the number of magnetic poles, and all of the multiple second rigid parts have equal rigidity, thus allowing for a simple design and manufacturing process.

[0012] The motor according to the fifth aspect is the motor according to the first aspect, wherein the annular portion is provided with two or more of the second rigid portions at unequal intervals in the circumferential direction. With this configuration, for example, compared to the case where the second rigid section is provided at equal intervals in the circumferential direction, it becomes less likely for an elliptical resonance mode to occur.

[0013] The motor of the sixth aspect is the motor of the fifth aspect, wherein the annular portion is provided with a number of second rigid parts different from the number of magnetic poles, and all of the plurality of second rigid parts have equal rigidity by having the same constituent material, radial length, and axial length.

[0014] This configuration allows for a simpler structure compared to, for example, a case where some of the second rigid parts among multiple second rigid parts have different rigidities. The motor according to the seventh aspect is the motor according to the fifth aspect, wherein the annular portion is provided with a number of second rigid parts different from the number of magnetic poles, and the rigidity of two or more of the second rigid parts differs due to differences in the material they are made of, their radial length, or their axial length.

[0015] With this configuration, for example, the resonant frequency of the annular section can be shifted more significantly with respect to the frequency of the electromagnetic excitation force compared to the case where the stiffness of all the second rigid sections is equal. In the motor of the eighth aspect, the second rigid part has a radial length shorter than the first length, compared to the motor of the first aspect.

[0016] This configuration allows for a simpler structure compared to, for example, a case where the second rigid part is constructed using a material different from the magnetic material. In the motor according to the ninth aspect, the second rigid part has an axial length shorter than the second length, in the motor according to the first aspect.

[0017] This configuration allows for a simpler structure compared to, for example, a case where the second rigid part is constructed using a material different from the magnetic material. The motor according to the tenth aspect is the motor according to the first aspect, wherein the second rigid part includes a material having a Young's modulus different from that of the magnetic material.

[0018] In this configuration, the second rigid part contains a material with a Young's modulus different from that of the magnetic material, resulting in a different rigidity from the first rigid part. Furthermore, for example, the radial length of the second rigid part can be made equal to the length of the first rigid part, and the axial length of the second rigid part can be made equal to the length of the second rigid part, thereby suppressing chipping of the first rigid part.

[0019] The motor of the eleventh aspect is a motor of any one of the first or tenth aspects, wherein the magnetic material is a bonded magnet containing magnetic powder. This configuration allows for the use of injection molding, making it easier to mold the magnetic material portion of a permanent magnet.

[0020] The motor of the twelfth aspect is the motor of the eleventh aspect, wherein the annular portion has one or more gate marks between adjacent second rigid portions in the circumferential direction. With this configuration, during injection molding, the magnetic material flows well between adjacent second rigid parts in the circumferential direction.

[0021] The motor according to the 13th aspect is the motor according to the 12th aspect, wherein the annular portion has a gate mark for each of the magnetic poles. According to this configuration, during injection molding, the magnet material will flow in well for each magnetic pole.

[0022] The blower according to the 14th aspect includes any one of the motors from the 1st aspect to the 13th aspect. According to this configuration, in the blower, noise based on the resonance of the rotor can be reduced.

[0023] The refrigeration device according to the 15th aspect includes any one of the motors from the 1st aspect to the 13th aspect. According to this configuration, in the refrigeration device, noise based on the resonance of the rotor can be reduced.

Brief Description of the Drawings

[0024] [Figure 1] It is a schematic diagram of a refrigeration device in an embodiment. [Figure 2] It is a partial cross-sectional view of a blower in an embodiment. [Figure 3] It is a plan view seen from the axial direction of a permanent magnet in an embodiment. [Figure 4] It is a plan view seen from the axial direction of a permanent magnet in another example. [Figure 5] It is a plan view seen from the axial direction of a permanent magnet in another example. [Figure 6] It is a plan view seen from the axial direction of a permanent magnet in another example. [Figure 7] It is a plan view seen from the axial direction of a permanent magnet in another example. [Figure 8] It is a plan view seen from the axial direction of a permanent magnet in another example. [Figure 9] It is a plan view seen from the axial direction of a permanent magnet in another example. [Figure 10] It is a cross-sectional view of a permanent magnet in another example. [Figure 11] It is a partial plan view seen from the axial direction of a permanent magnet in another example. [Figure 12] It is a partial plan view seen from the axial direction of a permanent magnet in another example. [Figure 13] This is a partial plan view of a permanent magnet as seen from the axial direction in another example. [Figure 14] This is a partial plan view of a permanent magnet as seen from the axial direction in another example. [Figure 15] This is a partial cross-sectional view of a blower in another example. [Figure 16] This is a partial cross-sectional view of a motor in another example. [Figure 17] This is a plan view of the rotor as seen from the axial direction in another example. [Modes for carrying out the invention]

[0025] The refrigeration system and blower will be explained with reference to Figures 1 to 3. <Refrigeration unit 10> As shown in Figure 1, the refrigeration system 10 is an air conditioner comprising an indoor unit 20 installed inside a room and an outdoor unit 30 installed outside a room. The indoor unit 20 is equipped with a blower 40 inside.

[0026] <Blower 40> As shown in Figures 1 and 2, the blower 40 comprises a motor 50 and a cross-flow fan 60.

[0027] <Motor 50> As shown in Figure 2, the motor 50 comprises a stator 70, a rotating shaft 80, and a rotor 90.

[0028] The stator 70 comprises a stator core 71, windings 72, and a mold 73. The stator 70 is formed in a cylindrical shape overall. The stator core 71 is made of laminated electrical steel sheets, for example. The stator core 71 has teeth 74 that extend radially and are arranged in parallel in the circumferential direction. The windings 72 are wound around the teeth 74. The windings 72 are electrically connected to a power supply (not shown). The mold 73 is made of resin and is formed to cover the stator core 71 and the windings 72. When a drive current is supplied to the windings 72, the stator 70 generates a rotating magnetic field on its outer circumference.

[0029] A bearing 75 is fixed to the inner circumference of the stator 70. The bearing 75 is fixed to the inner circumference of the stator 70 by a fixing member 76. The fixing member 76 is fitted to the inner circumference of the stator 70 while holding the bearing 75 on its inner circumference. In this embodiment, the bearing 75 is a sliding bearing, but it may also be a ball bearing.

[0030] The rotating shaft 80 is rotatably supported by the bearing 75. More specifically, the outer surface of the rotating shaft 80 is positioned to slide against the inner surface of the bearing 75. As a result, the rotating shaft 80 is rotatably supported by the bearing 75 with its own axis center as the axis of rotation Z. The rotating shaft 80 is made of metal.

[0031] The rotor 90 has a flange 91 fixed to the rotating shaft 80 and a permanent magnet 92 fixed to the flange 91. The flange 91 is made of resin. The flange 91 is formed in a disc shape. The flange 91 has a central hole 93 that is fixed to the outer circumferential surface of the rotating shaft 80. The flange 91 is fixed to a portion of the rotating shaft 80 that protrudes outward from the stator 70 in the axial direction.

[0032] The permanent magnet 92 is formed in a cylindrical shape. In this embodiment, the permanent magnet 92 constitutes an annular portion 94 having multiple magnetic poles in the circumferential direction. The axial end of the permanent magnet 92 is fixed to the outer edge side of the flange 91. The permanent magnet 92 is positioned so that its inner circumferential surface faces the outer circumferential surface of the stator 70.

[0033] The rotating shaft 80, flange 91, and permanent magnet 92 are integrally molded. More specifically, the rotating shaft 80, flange 91, and permanent magnet 92 are integrally molded by insert molding, with the rotating shaft 80 and permanent magnet 92 acting as insert parts. A labyrinth structure may be provided on the radially outer side of the permanent magnet 92 to prevent foreign matter from entering the interior.

[0034] <Cross-flow fan 60> The cross-flow fan 60 is fixed to the flange 91. The cross-flow fan 60 is positioned on the opposite side of the flange 91 from where the stator 70 is located (the left side in Figure 2). The cross-flow fan 60 is formed in an elongated shape along the rotation axis Z.

[0035] <Permanent Magnet 92> As shown in Figure 3, the permanent magnet 92 of this embodiment has 10 magnetic poles in the annular portion 94. In Figure 3, the north pole (N) and south pole (S) are schematically shown on the radially inner side of the annular portion 94. The north and south poles are arranged alternately at equal angular intervals in the circumferential direction of the annular portion 94. The annular portion 94 is formed with a radial length of a first length A1 and an axial length of a second length A2 (see Figure 2).

[0036] The annular portion 94 has a first rigid portion 100 and a second rigid portion 110 in the circumferential direction. The first rigid portion 100 is made of a magnetic material, and its radial length is formed to a first length A1, and its axial length is formed to a second length A2 (see Figure 2), so that the rigidity per unit length in the circumferential direction is constant. The rigidity described below refers to the rigidity per unit length in the circumferential direction. The magnetic material is a bonded magnet containing magnetic powder.

[0037] The second rigid section 110 has a different rigidity from the first rigid section 100 because it differs from the first rigid section 100 in either its constituent material, radial length, or axial length. Specifically, the second rigid section 110 has a different rigidity from the first rigid section 100 because it differs from the first rigid section 100 in at least one of its constituent material, radial length, and axial length. The annular section 94 is provided with two or more second rigid sections 110 with different rigidities.

[0038] More specifically, in this embodiment, the annular portion 94 has second rigid portions 110 provided at equal intervals in the circumferential direction. Furthermore, the annular portion 94 has the same number of second rigid portions 110 as the number of magnetic poles. Since the number of magnetic poles in this embodiment is 10, the number of second rigid portions 110 is also 10. The second rigid portions 110 are arranged at each boundary between magnetic poles. That is, the second rigid portions 110 are arranged at the boundary between the north pole and the south pole.

[0039] Furthermore, the two or more second rigid parts 110 have different rigidity due to differences in the constituent material, radial length, or axial length. Specifically, the second rigid part 110 in this embodiment includes a second rigid part 110A and a second rigid part 110B, which have different rigidity.

[0040] The second rigid part 110A has different rigidity from the first rigid part 100 because its radial length and axial length are different from those of the first rigid part 100. Specifically, the second rigid part 110A has a recess 111, so its radial length is shorter than the first length A1 of the first rigid part 100, and its axial length is shorter than the second length A2 of the first rigid part 100. More specifically, the radial length of the second rigid part 110A at the location where the recess 111 is formed is shorter than the first length A1 of the first rigid part 100, and the axial length at the location where the recess 111 is formed is shorter than the second length A2 of the first rigid part 100. As a result, the second rigid part 110A has different rigidity from the first rigid part 100. The recess 111 in this embodiment is a slit formed with a constant width from the radially inner end of the annular part 94 toward the radially outer end.

[0041] Furthermore, the recess 111 is formed in the axial direction of the annular portion 94, from the end opposite to the side fixed to the flange 91 (see Figure 2) toward the side fixed to the flange 91. The second rigid portion 110A has a void inside the recess 111, so that its radial length is shorter than the first length A1 of the first rigid portion 100, and its axial length is shorter than the second length A2 of the first rigid portion 100.

[0042] The second rigid part 110B has a different rigidity from the first rigid part 100 because the material it is composed of is different from that of the first rigid part 100. In other words, the second rigid part 110B contains a different material from the magnetic material that constitutes the first rigid part 100. Specifically, the second rigid part 110B has a recess 111, and a resin material 112, which has a Young's modulus different from that of the magnetic material, is placed in the recess 111, resulting in a different rigidity from the first rigid part 100.

[0043] Furthermore, the second rigid part 110B has different rigidity from the second rigid part 110A because it is composed of different materials. In Figure 3, the resin material 112 of the second rigid part 110B is shown using shading to distinguish it from the recess 111 of the second rigid part 110A.

[0044] Furthermore, the number of second rigid parts 110A and second rigid parts 110B differs. In this embodiment, there are 6 second rigid parts 110A and 4 second rigid parts 110B. Each of the second rigid parts 110A and second rigid parts 110B is provided at unequal intervals in the circumferential direction of the annular part 94. In this embodiment, for example, the second rigid parts 110A and second rigid parts 110B are arranged such that the number of second rigid parts 110A positioned between adjacent second rigid parts 110B in the circumferential direction ranges from 0 to 3. Specifically, in this embodiment, in a clockwise direction from the top of Figure 3, the second rigid part 110B, three second rigid parts 110A, second rigid part 110B, second rigid part 110A, second rigid part 110B, two second rigid parts 110A, and second rigid part 110B are arranged in this order.

[0045] The annular portion 94 has one or more gate marks 113 between adjacent second rigid portions 110 in the circumferential direction. In this embodiment, the annular portion 94 has one gate mark 113 for each magnetic pole. The gate marks 113 are marks that occur during injection molding and are marks that occur as the molten magnetic material passes through the gate.

[0046] The operation of this embodiment will now be explained. When drive current is supplied to winding 72, a rotating magnetic field is generated on the outer circumference of stator 70. As a result, rotor 90 is driven to rotate around the rotation axis Z, and cross-flow fan 60 rotates. This causes the cross-flow fan 60 to perform a blowing operation.

[0047] The effects of this embodiment will now be explained. (1) The annular portion 94 has a first rigid portion 100 and a second rigid portion 110 having different rigidity from the first rigid portion 100 in the circumferential direction. In this embodiment, the annular portion 94 is provided with two or more second rigid portions 110A, 110B having different rigidity. Therefore, the configuration of the permanent magnet 92 makes it possible to shift the resonance frequency of the annular portion 94 with respect to the frequency of the electromagnetic excitation force. As a result, the motor 50 alone can reduce noise based on the resonance of the rotor 90. This makes it possible to reduce noise based on the resonance of the rotor 90 in the blower 40 and the refrigeration device 10.

[0048] (2) Since the second rigid parts 110 of the annular part 94 are provided at equal intervals in the circumferential direction, the weight imbalance of the annular part 94 can be reduced compared to, for example, the case in which the second rigid parts 110 are provided at unequal intervals in the circumferential direction.

[0049] (3) The second rigid parts 110 are provided at equal intervals in the circumferential direction and in the same number as the number of magnetic poles. For example, as in this embodiment, the second rigid parts 110 can be arranged at each boundary between magnetic poles. This makes it possible to increase the magnetic force of each magnetic pole uniformly.

[0050] (4) The second rigid part 110A has a radial length shorter than the first length A1 of the first rigid part 100. Also, the second rigid part 110A has an axial length shorter than the second length A2 of the first rigid part 100. As a result, the second rigid part 110A has a different rigidity from the first rigid part 100. This configuration allows for a simpler structure compared to, for example, a case where the second rigid part 110A is made of a material different from the magnetic material.

[0051] (5) The second rigid part 110B contains a resin material 112 which has a Young's modulus different from that of the magnet material, and therefore its rigidity is different from that of the first rigid part 100. For example, as in this embodiment, the radial length of the second rigid part 110B can be made equal to the first length A1, and the axial length of the second rigid part 110B can be made equal to the second length A2, so that chipping of the first rigid part 100 can be suppressed. In other words, because the resin material 112 is arranged in the recess 111 of the second rigid part 110B, chipping of the corners of the first rigid part 100 can be suppressed.

[0052] (6) The second rigid part 110 includes a second rigid part 110A and a second rigid part 110B. Both the second rigid part 110A and the second rigid part 110B have a recess 111, and their rigidity differs depending on whether the inside of the recess 111 is a void or whether a material with a Young's modulus different from that of the magnetic material is placed inside the recess 111. In this way, the second rigid part 110A and the second rigid part 110B, which have different rigidities, can be made into a simple structure.

[0053] (7) Since the magnetic material is a bonded magnet containing magnetic powder, injection molding can be used, making it easy to mold the part of the permanent magnet 92 that is made of magnetic material. (8) The annular portion 94 has one or more gate marks 113 between adjacent second rigid portions 110 in the circumferential direction. Therefore, during injection molding, the magnetic material flows well between adjacent second rigid portions 110 in the circumferential direction.

[0054] (9) The annular portion 94 has one gate mark 113 for each magnetic pole. Therefore, during injection molding, the magnetic material flows well into each magnetic pole. <Variation> In addition to the embodiments described above, the motor 50, refrigeration device 10, and blower 40 of this disclosure may also be modified in the following ways, or in combination of at least two mutually non-inconsistent modifications.

[0055] As shown in Figure 4, the annular portion 94 may be modified. In this example, the annular portion 94 is provided with a number of second rigid portions 110 that differ from the number of magnetic poles. In this example, the number of magnetic poles is 10, and the number of second rigid portions 110 is 5. The second rigid portions 110 are provided at equal intervals in the circumferential direction of the annular portion 94.

[0056] In this example, all of the second rigid parts 110 have equal rigidity because the constituent material, radial length, and axial length are equal. All of the second rigid parts 110 in this example are the second rigid parts 110B of the above embodiment, which includes the resin material 112. Note that the gate marks 113 are not shown in Figure 4.

[0057] Even in this configuration, since the annular portion 94 is provided with a number of second rigid parts 110 that differ from the number of magnetic poles, the resonant frequency of the annular portion 94 can be shifted with respect to the frequency of the electromagnetic excitation force by the configuration of the permanent magnet 92. Furthermore, since the second rigid parts 110 are provided at equal intervals in the circumferential direction, in a number different from the number of magnetic poles, and all of the multiple second rigid parts 110 have equal rigidity, the design and manufacturing can be simplified.

[0058] As shown in Figure 5, the annular portion 94 may be modified. In this example, the annular portion 94 is provided with two or more second rigid portions 110 at unequal intervals in the circumferential direction. In this example, the second rigid portions 110 are positioned at the boundaries between magnetic poles. In this example, for example, the second rigid portions 110 are arranged such that the number of magnetic poles positioned between adjacent second rigid portions 110 in the circumferential direction ranges from one to three. Specifically, in this example, the second rigid portions 110 are arranged in a clockwise direction from the top of Figure 5, sandwiching two magnetic poles, two magnetic poles, two magnetic poles, three magnetic poles, and one magnetic pole.

[0059] Furthermore, the annular portion 94 in this example is provided with a number of second rigid portions 110 that differ from the number of magnetic poles. In this example, the number of magnetic poles is 10, and the number of second rigid portions 110 is 5. All of the multiple second rigid portions 110 in this example have equal rigidity because they are made of the same material and have the same radial length and axial length. All of the second rigid portions 110 in this example are the second rigid portions 110A of the above embodiment.

[0060] In this example, the annular portion 94 has one or more gate marks 113 between adjacent second rigid portions 110 in the circumferential direction. The annular portion 94 also has one gate mark 113 for each magnetic pole. That is, in the region where two magnetic poles are arranged between adjacent second rigid portions 110 in the circumferential direction, two gate marks 113 are formed between the adjacent second rigid portions 110 in the circumferential direction. In the region where three magnetic poles are arranged between adjacent second rigid portions 110 in the circumferential direction, three gate marks 113 are formed between the adjacent second rigid portions 110 in the circumferential direction.

[0061] Even in this configuration, since the annular portion 94 is provided with two or more second rigid portions 110 at unequal intervals in the circumferential direction, the resonant frequency of the annular portion 94 can be shifted with respect to the frequency of the electromagnetic excitation force by the configuration of the permanent magnet 92. Furthermore, compared to, for example, the case where the second rigid portions 110 are provided at equal intervals in the circumferential direction, it becomes less likely for an elliptical resonant mode to occur. In addition, since all of the multiple second rigid portions 110 have the same rigidity, the configuration can be simpler compared to, for example, the case where some of the second rigid portions 110 have different rigidity.

[0062] As shown in Figure 6, the annular portion 94 may be modified. In this example, the annular portion 94 is provided with two or more second rigid portions 110 at unequal intervals in the circumferential direction. In this example, the number of magnetic poles is 10, and the number of second rigid portions 110 is 10. In this example, some of the multiple second rigid portions 110 are located at the boundaries between magnetic poles, and some of the multiple second rigid portions 110 are located in areas other than the boundaries between magnetic poles.

[0063] Furthermore, in this example, the two or more second rigid parts 110 have different rigidity due to differences in the constituent material, radial length, or axial length. The second rigid part 110 in this example includes a second rigid part 110A and a second rigid part 110B, which have different rigidity, similar to the embodiment described above. Note that the gate marks 113 are not shown in Figure 6.

[0064] Even in this configuration, since the annular portion 94 is provided with two or more second rigid portions 110 at unequal intervals in the circumferential direction, the resonant frequency of the annular portion 94 can be shifted with respect to the frequency of the electromagnetic excitation force by the configuration of the permanent magnet 92. Furthermore, compared to the case where the second rigid portions 110 are provided at equal intervals in the circumferential direction, for example, a more elliptical resonant mode is less likely to occur. In addition, since the two or more second rigid portions 110 have different rigidities, compared to the case where the rigidity of all of the second rigid portions 110 is equal, for example, the resonant frequency of the annular portion 94 can be shifted more significantly with respect to the frequency of the electromagnetic excitation force.

[0065] As shown in Figure 7, the annular portion 94 may be modified. In this example, the annular portion 94 is provided with two or more second rigid portions 110 at equal intervals in the circumferential direction. The two or more second rigid portions 110 have different rigidity due to the different radial ranges in which the magnet material is arranged. Specifically, the second rigid portion 110 in this embodiment includes a second rigid portion 110A and a second rigid portion 110C with different rigidity.

[0066] The second rigid section 110C has a recess 114, so its radial length is shorter than the first length A1 of the first rigid section 100, and its axial length is shorter than the second length A2 of the first rigid section 100 (see Figure 2). In this example, the recess 114 in the second rigid section 110C is a slit formed with a constant width from the radially outer end of the annular section 94 toward the radially inner side. As a result, the second rigid section 110A and the second rigid section 110C have different rigidity due to the different radial ranges in which the magnetic material is arranged. That is, the second rigid section 110A and the second rigid section 110C have different rigidity due to the different radial ranges in which the recesses 111 and 114 are arranged. The second rigid section 110A and the second rigid section 110C are each provided at unequal intervals in the circumferential direction of the annular section 94. Note that the gate marks 113 are not shown in Figure 7.

[0067] Even in this configuration, since the annular portion 94 is provided with two or more second rigid portions 110A and 110C with different rigidities, the resonant frequency of the annular portion 94 can be shifted with respect to the frequency of the electromagnetic excitation force by the configuration of the permanent magnet 92. Furthermore, since the second rigid portions 110A and 110C are made of the same material as the magnet material, a simple configuration can be achieved.

[0068] As shown in Figure 8, the annular portion 94 may be modified. In this example, the annular portion 94 is provided with two or more second rigid portions 110 at equal intervals in the circumferential direction. The two or more second rigid portions 110 have different rigidity due to their different radial lengths. Specifically, the second rigid portion 110 in this embodiment includes a second rigid portion 110A and a second rigid portion 110D with different rigidity.

[0069] The second rigid section 110D has a recess 115, so its radial length is shorter than the first length A1 of the first rigid section 100, and its axial length is shorter than the second length A2 of the first rigid section 100 (see Figure 2). Furthermore, the recess 115 in the second rigid section 110D in this example has a radial length shorter than the recess 111 in the second rigid section 110A. As a result, the second rigid section 110A and the second rigid section 110D have different rigidity due to their different radial lengths. More specifically, the second rigid section 110D has a different rigidity from the second rigid section 110A because its radial length is longer than that of the second rigid section 110A. The second rigid section 110A and the second rigid section 110D are each provided at unequal intervals in the circumferential direction of the annular section 94. Note that the gate marks 113 are not shown in Figure 8.

[0070] Even in this configuration, since the annular portion 94 is provided with two or more second rigid portions 110A and 110D with different rigidities, the resonant frequency of the annular portion 94 can be shifted with respect to the frequency of the electromagnetic excitation force by the configuration of the permanent magnet 92. Furthermore, since the second rigid portions 110A and 110D are made of the same material as the magnet material, a simple configuration can be achieved.

[0071] As shown in Figures 9 and 10, the annular portion 94 may be modified. In this example, the annular portion 94 is provided with two or more second rigid portions 110 at equal intervals in the circumferential direction. The two or more second rigid portions 110 have different rigidity due to their different axial lengths. Specifically, the second rigid portion 110 in this embodiment includes a second rigid portion 110A and a second rigid portion 110E, which have different rigidity.

[0072] The second rigid section 110E has a recess 116, so its radial length is shorter than the first length A1 of the first rigid section 100, and its axial length is shorter than the second length A2 of the first rigid section 100. Furthermore, as shown in Figure 10, the recess 116 in the second rigid section 110E in this example has a shorter axial length than the recess 111 in the second rigid section 110A. As a result, the second rigid section 110A and the second rigid section 110E have different rigidity due to their different axial lengths. More specifically, the second rigid section 110E has a different rigidity from the second rigid section 110A because its axial length is longer than that of the second rigid section 110A. The second rigid section 110A and the second rigid section 110E are each provided at unequal intervals in the circumferential direction of the annular section 94. Note that the gate marks 113 are not shown in Figure 9.

[0073] Even in this configuration, since the annular portion 94 is provided with two or more second rigid portions 110A and 110E with different rigidities, the resonant frequency of the annular portion 94 can be shifted with respect to the frequency of the electromagnetic excitation force by the configuration of the permanent magnet 92. Furthermore, since the second rigid portions 110A and 110E are made of the same material as the magnet material, a simple configuration can be achieved.

[0074] In the above embodiment, the recess 111 of the second rigid portion 110 is a slit formed with a constant width from the radially inner end of the annular portion 94 toward the radially outer end, but it is not limited to this and may be changed to other shapes.

[0075] For example, as shown in Figure 11, the recess 117 of the second rigid part 110 may have the shape of a part of an ellipse when viewed in the axial direction. Also, two or more second rigid parts 110 may have different rigidity due to differences in the size of the recess 117.

[0076] Furthermore, as shown in Figure 12, for example, the recess 118 of the second rigid part 110 may have the shape of a part of a triangle when viewed in the axial direction. Also, two or more second rigid parts 110 may have different rigidity due to differences in the size of the recess 118.

[0077] Furthermore, as shown in Figure 13, for example, the recess 119 of the second rigid part 110 may have a circular shape when viewed in the axial direction. Also, two or more second rigid parts 110 may have different rigidities due to differences in the size of the recess 119.

[0078] Furthermore, as shown in Figure 14, for example, the recess 120 of the second rigid portion 110 may have a circular shape when viewed in the axial direction. Also, two or more second rigid portions 110 may have different rigidity due to differences in the size of the recess 120. In addition, the recesses 111, 114, 115, 116, 117, 118, 119, and 120 in the above embodiment and other examples may penetrate the annular portion 94 in the axial direction.

[0079] In the above embodiment, the permanent magnet 92 is described as having an annular portion 94 as its entirety, but it is not limited to this, and may have a configuration in which the annular portion 94 and other parts are present. For example, as shown in Figure 15, the permanent magnet 92 may have a configuration that includes an annular portion 94 and a flange portion 95 having the same shape as the flange 91 in the above embodiment. In other words, in this example, the flange portion 95 of the permanent magnet 92 is directly fixed to the rotating shaft 80.

[0080] In the above embodiment, the motor 50 is an outer rotor type, but it is not limited to this and may be an inner rotor type. For example, the configuration may be modified as shown in Figures 16 and 17. As shown in Figure 16, the motor 130 in this example comprises a stator 140, a rotating shaft 150, and a rotor 160.

[0081] The stator 140 comprises a stator core 141 and windings 142. The stator 140 is formed in a cylindrical shape overall. The stator core 141 has teeth 143 that extend radially and are arranged in parallel in the circumferential direction. The windings 142 are wound around the teeth 143. The windings 142 are electrically connected to a power supply (not shown). When a drive current is supplied to the windings 142, the stator 140 generates a rotating magnetic field on the inner circumference side.

[0082] The rotating shaft 150 is rotatably supported by a bearing (not shown) with its own axis center as the rotation axis Z. The rotor 160 has a fixing member 161 fixed to the rotating shaft 150 and a permanent magnet 162 fixed to the fixing member 161. The fixing member 161 is made of resin. The fixing member 161 has a cylindrical boss portion 163 fitted onto the rotating shaft 150, a disc-shaped flange portion 164 connected to the outer circumference of the boss portion 163, and a cylindrical portion 165 connected to the outer edge of the flange portion 164.

[0083] The permanent magnet 162 is formed in a cylindrical shape. In this example, the permanent magnet 162 constitutes an annular portion 166 having multiple magnetic poles in the circumferential direction. The inner surface of the permanent magnet 162 is fixed to the outer surface of the cylindrical portion 165 of the fixing member 161. The permanent magnet 162 is positioned so that its outer surface faces the inner surface of the stator 140.

[0084] As shown in Figure 17, the permanent magnet 162 in this example has 10 magnetic poles in the annular portion 166. In Figure 17, the north pole (N) and south pole (S) are schematically shown on the radially outer side of the annular portion 166.

[0085] The annular portion 166 has a first rigid portion 170 and a second rigid portion 180 in the circumferential direction. The second rigid portions 180 of the annular portion 166 are provided at equal intervals in the circumferential direction. Furthermore, the annular portion 166 has the same number of second rigid portions 180 as there are magnetic poles. The second rigid portions 180 are arranged at each boundary between magnetic poles. The second rigid portions 180 include second rigid portions 180A and second rigid portions 180B, which have different rigidities.

[0086] The second rigid part 180A has a recess 181, and the inside of the recess 181 is a void. The second rigid part 180B also has a recess 181, and a resin material 182 is placed inside the recess 181.

[0087] In this configuration, the annular portion 166 has a first rigid portion 170 and a second rigid portion 180 having different rigidity from the first rigid portion 170, in the circumferential direction. In this example, the annular portion 166 is provided with two or more second rigid portions 180A, 180B having different rigidity. Therefore, the configuration of the permanent magnet 162 allows the resonance frequency of the annular portion 166 to be shifted with respect to the frequency of the electromagnetic excitation force. Thus, the motor 130 alone can reduce noise based on the resonance of the rotor 160.

[0088] In the above embodiment, the number of magnetic poles in the annular portion 94 is 10, but it is not limited to this. For example, the number of magnetic poles in the annular portion 94 may be 6 or 8. In the above embodiment, the number of second rigid parts 110A is 6 and the number of second rigid parts 110B is 4, but this is not limited to this. For example, the number of second rigid parts 110A may be 3 and the number of second rigid parts 110B may be 7. Also, for example, the number of second rigid parts 110A may be 5 and the number of second rigid parts 110B may be 5.

[0089] In the above embodiment, the magnetic material is a bonded magnet containing magnetic powder, but it is not limited to this and may be other magnetic materials. In the above embodiment, a resin material 112 is placed in the recess 111 of the second rigid part 110B. However, the resin material 112 may be changed to another material such as rubber or metal, as long as the material has a Young's modulus different from that of the magnetic material.

[0090] In the above embodiment, the annular portion 94 is assumed to have one or more gate marks 113 between adjacent second rigid portions 110 in the circumferential direction, but it is not limited to this, and it is not necessary for adjacent second rigid portions 110 in the circumferential direction to have gate marks 113. Also, in the above embodiment, the annular portion 94 is assumed to have one gate mark 113 for each magnetic pole, but it is not limited to this, and it is not necessary for each magnetic pole to have a gate mark 113.

[0091] In the above embodiment, the motor 50 is provided in the blower 40, but it is not limited to this, and a motor 50 used for other purposes may also be used. In the above embodiment, the motor 50 is provided in the refrigeration unit 10, but it is not limited to this, and may be a motor 50 used for other purposes. Also, in the above embodiment, the motor 50 is provided in the indoor unit 20, but it is not limited to this, and may be a motor 50 provided in the outdoor unit 30.

[0092] Although embodiments of the motors 50, 130, the refrigeration device 10, and the blower 40 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 refrigeration device 10 and the blower 40 as described in the claims. [Explanation of Symbols]

[0093] A1...First length, A2...Second length, Z...Rotation axis, 10...Refrigeration device, 40...Blower, 50...Motor, 70...Stator, 90...Rotor, 92...Permanent magnet, 94...Ring section, 100...First rigid section, 110...Second rigid section, 110A...Second rigid section, 110B...Second rigid section, 110C...Second rigid section, 110D...Second rigid section, 110E...Second rigid section, 112...Resin material, 113...Gate mark, 130...Motor, 140...Stator, 160...Rotor, 162...Permanent magnet, 166...Ring section, 170...First rigid section, 180...Second rigid section, 180A...Second rigid section, 180B...Second rigid section, 182...Resin material.

Claims

1. The stator (70, 140) and, A rotor (90, 160) having permanent magnets (92, 162) and rotating around a rotation axis (Z), A motor equipped with, The permanent magnet (92, 162) has an annular portion (94, 166) having multiple magnetic poles in the circumferential direction, The annular portion (94, 166) has a first rigid portion (100, 170) and a second rigid portion (110, 180) in the circumferential direction. The first rigid portion (100, 170) is made of a magnetic material, and its radial length is formed to be a first length (A1), and its axial length is formed to be a second length (A2), thereby making the rigidity per unit length in the circumferential direction constant. The second rigid part (110, 180) differs from the first rigid part (100, 170) in terms of the material it is made of, its radial length, or its axial length, and therefore its rigidity differs from that of the first rigid part (100, 170). The annular portion (94, 166) is provided with a number of second rigid portions (110, 180) different from the number of magnetic poles, or with two or more second rigid portions (110, 180) arranged at unequal intervals in the circumferential direction, or with two or more second rigid portions (110, 180) having different rigidities. Motor.

2. The annular portion (94, 166) has the second rigid portion (110, 180) provided at equal intervals in the circumferential direction. The motor according to claim 1.

3. The annular portion (94, 166) is provided with the same number of second rigid portions (110, 180) as the number of magnetic poles. The two or more of the second rigid parts (110, 180) have different rigidities due to differences in the constituent material, radial length, or axial length. The motor according to claim 2.

4. The annular portion (94) is provided with a number of second rigid portions (110) that is different from the number of magnetic poles. All of the multiple second rigid parts (110) have the same material, radial length, and axial length, thereby having the same rigidity. The motor according to claim 2.

5. The annular portion (94) is provided with two or more of the second rigid portions (110) at unequal intervals in the circumferential direction. The motor according to claim 1.

6. The annular portion (94) is provided with a number of second rigid portions (110) that is different from the number of magnetic poles. All of the multiple second rigid parts (110) have the same material, radial length, and axial length, thereby having the same rigidity. The motor according to claim 5.

7. The annular portion (94) is provided with a number of second rigid portions (110) that is different from the number of magnetic poles. The two or more of the second rigid parts (110) have different rigidities due to differences in the constituent material, radial length, or axial length. The motor according to claim 5.

8. The second rigid portion (110) has a radial length shorter than the first length (A1). The motor according to claim 1.

9. The second rigid portion (110) has an axial length shorter than the second length (A2). The motor according to claim 1.

10. The second rigid portion (110, 180) includes a material (112) having a Young's modulus different from that of the magnetic material. The motor according to claim 1.

11. The aforementioned magnetic material is a bonded magnet containing magnetic powder. The motor according to claim 1.

12. The annular portion (94) has one or more gate marks (113) between adjacent second rigid portions (110) in the circumferential direction. The motor according to claim 11.

13. The annular portion (94) has gate marks (113) for each of the magnetic poles. The motor according to claim 12.

14. A blower comprising a motor (50) according to any one of claims 1 to 13.

15. A refrigeration apparatus comprising a motor (50) according to any one of claims 1 to 13.

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