Electric motor, compressor, blower and refrigeration unit

Abstract

Provided is a technique for further increasing the magnetic flux of a magnetic pole of a magnet opposite a stator in a rotor. A motor (1) according to an embodiment of the present invention includes: a stator (10); a rotor (20) opposite the stator (10) in an axial direction (first direction) and configured to be rotatable in a circumferential direction (second direction) orthogonal to the axial direction; and a short-circuit suppression member (25, 26) provided to a portion of the rotor (20) around which an imaginary line connecting a second magnetic pole and a third magnetic pole of an auxiliary magnet (23, 24) passes, for suppressing short-circuiting of the magnetic flux between the second magnetic pole and the third magnetic pole.

Description

Technical Field

[0001] This invention relates to electric motors, etc. Background Technology

[0002] For example, for a main magnet having magnetic poles on the surface opposite to the stator, a technique is known of using a Hellbeck array to configure auxiliary magnets in order to increase the magnetic flux of the main magnet's magnetic poles opposite to the stator, thereby increasing the output of the motor (see Patent Document 1).

[0003] <Prior art documents>

[0004] <Patent Documents>

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-161760 Summary of the Invention

[0006] <Problem to be solved by this invention>

[0007] However, in Patent Document 1, an auxiliary magnet is provided in the rotor core. Therefore, the magnetic flux generated by the rotor core short-circuits the poles of the auxiliary magnet, resulting in the possibility that the magnetic flux of the main magnet opposite the stator poles cannot be sufficiently increased.

[0008] The purpose of this invention is to provide a technique in a rotor that can further increase the magnetic flux of the magnetic poles of the magnet opposite to the stator.

[0009] <Methods for solving problems>

[0010] In one embodiment of the present invention, an electric motor is provided, comprising:

[0011] stator;

[0012] The rotor is configured to be opposite the stator in a first direction and to rotate freely in a second direction orthogonal to the first direction; and

[0013] Short circuit suppression section, The rotor mentioned above includes: The first magnet has a first magnetic pole on the surface opposite to the stator. The second magnet, arranged adjacent to the first magnet, has a second magnetic pole and a third magnetic pole with a polarity different from the second magnetic pole, and increases the magnetic flux of the first magnetic pole. The second magnet is arranged adjacent to the first magnet in a third direction orthogonal to the first direction. The aforementioned short-circuit suppression section is provided in the portion surrounding the second magnet that is parallel to and faces the imaginary line connecting the second and third magnetic poles, thereby suppressing the short circuit of the magnetic flux between the second and third magnetic poles.

[0014] According to this embodiment, by means of the portion surrounding the magnetic poles connected to the interior of the second magnet that are parallel to each other with imaginary lines, it is difficult to generate magnetic flux that would short-circuit the magnetic poles of the second magnet. Therefore, it is possible to further increase the magnetic flux of the magnetic poles opposite to the stator of the first magnet.

[0015] Furthermore, in the above embodiments, The aforementioned third direction can be orthogonal to the aforementioned second direction.

[0016] Furthermore, in the above embodiments, The rotor and stator described above are arranged axially opposite each other. The aforementioned first magnet is arranged circumferentially with multiple first magnetic poles centered on the axis of rotation. The second magnet can be arranged such that the second magnetic pole or the third magnetic pole is radially adjacent to each of the plurality of first magnetic poles.

[0017] Furthermore, in the above embodiments, The rotor and stator described above are arranged radially opposite each other. The aforementioned first magnet is arranged circumferentially with multiple first magnetic poles centered on the axis of rotation. The second magnet can be arranged such that the second magnetic pole or the third magnetic pole is axially adjacent to each of the plurality of first magnetic poles.

[0018] Furthermore, in the above embodiments, The aforementioned third direction can be the same as the aforementioned second direction.

[0019] Furthermore, in the above embodiments, The rotor and stator described above are arranged axially opposite each other. The aforementioned first magnet is arranged circumferentially with multiple first magnetic poles centered on the axis of rotation. The second magnet can be arranged such that the second magnetic pole or the third magnetic pole is circumferentially adjacent to each of the plurality of first magnetic poles.

[0020] Furthermore, in the above embodiments, The rotor and stator described above are arranged radially opposite each other. The aforementioned first magnet is arranged circumferentially with multiple first magnetic poles centered on the axis of rotation. The second magnet can be arranged such that, when viewed from the axial direction, the second or third magnetic pole is adjacent to the ends of the plurality of first magnetic poles in the respective directions orthogonal to the main magnetic flux.

[0021] Furthermore, in the above embodiments, The first magnet described above has a fourth magnetic pole on a surface different from the surface having the first magnetic pole. The rotor mentioned above includes: Multiple of the aforementioned first magnets; and The first component constitutes the magnetic circuit between the multiple fourth magnetic poles mentioned above. The magnetic reluctance of the short-circuit suppression section can be higher than that of the first component.

[0022] Furthermore, in the above embodiments, A non-magnetic material can be provided in the aforementioned short-circuit suppression section.

[0023] Furthermore, in the above embodiments, Space may be provided in the aforementioned short-circuit suppression section where no components exist.

[0024] Furthermore, in the above embodiments, The second magnet can be magnetized in a direction perpendicular to the magnetization direction of the first magnet.

[0025] Furthermore, in the above embodiments, The second magnet can be magnetized in a direction that intersects the magnetization direction of the first magnet at an angle greater than 0 degrees and less than 90 degrees.

[0026] Furthermore, in the above embodiments, At least one of the first magnet and the second magnet can be magnetized in an anisotropic magnetization orientation.

[0027] Furthermore, in the above embodiments, The first magnet and the second magnet mentioned above can be integrally formed.

[0028] In another embodiment of the present invention, a compressor is provided which is equipped with the aforementioned electric motor.

[0029] In another further embodiment of the present invention, a blower is provided, which is equipped with the aforementioned electric motor.

[0030] Furthermore, in another embodiment of the present invention, a refrigeration apparatus is provided, including a compressor and a blower. The electric motor is installed in at least one of the compressor and the blower.

[0031] <Invention Effects>

[0032] According to the above embodiment, in the rotor, the magnetic flux of the magnetic poles opposite to the stator of the magnet can be further increased. Attached Figure Description

[0033] Figure 1 This is an exploded perspective view showing an example of an electric motor according to the first embodiment.

[0034] Figure 2 This is an axial view showing an example of a rotor according to the first embodiment.

[0035] Figure 3 This is a cross-sectional view showing an example of an electric motor according to the first embodiment.

[0036] Figure 4 This is a cross-sectional view showing a comparative example of an electric motor.

[0037] Figure 5 This is a cross-sectional view showing an example of an electric motor according to the second embodiment.

[0038] Figure 6 This is a cross-sectional view showing another example of an electric motor according to the second embodiment.

[0039] Figure 7 This is an axial view showing an example of a rotor according to the third embodiment.

[0040] Figure 8 This is a cross-sectional view showing an example of an electric motor according to a third embodiment.

[0041] Figure 9 This is an axial view showing an example of a rotor according to the fourth embodiment.

[0042] Figure 10 This is a cross-sectional view showing an example of an electric motor according to the fourth embodiment.

[0043] Figure 11 This is a cross-sectional view showing an example of an electric motor according to the fifth embodiment.

[0044] Figure 12 This is a cross-sectional view showing an example of an electric motor according to the fifth embodiment.

[0045] Figure 13 This is a perspective view showing an example of the rotor according to the fifth embodiment.

[0046] Figure 14 This is an exploded perspective view showing an example of the rotor of the fifth embodiment.

[0047] Figure 15 This is a longitudinal sectional view showing an example of an electric motor according to the fifth embodiment.

[0048] Figure 16 This is a longitudinal sectional view showing an example of an electric motor according to the fifth embodiment.

[0049] Figure 17 This is a cross-sectional view showing another example of the electric motor according to the fifth embodiment.

[0050] Figure 18 This is a perspective view showing another example of the rotor according to the fifth embodiment.

[0051] Figure 19 This is an exploded perspective view showing another example of the rotor according to the fifth embodiment.

[0052] Figure 20 This is a longitudinal sectional view showing another example of the electric motor according to the fifth embodiment.

[0053] Figure 21 This is a longitudinal sectional view showing another example of the electric motor according to the fifth embodiment.

[0054] Figure 22 This is a cross-sectional view showing an example of an electric motor according to the sixth embodiment.

[0055] Figure 23 This is a longitudinal sectional view showing an example of an electric motor according to the sixth embodiment.

[0056] Figure 24 This is a cross-sectional view showing an example of the electric motor according to the seventh embodiment.

[0057] Figure 25 This is a cross-sectional view showing an example of the electric motor according to the seventh embodiment.

[0058] Figure 26 This is a perspective view showing an example of the rotor according to the seventh embodiment.

[0059] Figure 27 This is an exploded perspective view showing an example of the rotor according to the seventh embodiment.

[0060] Figure 28 This is a diagram showing an example of the main magnet in the seventh embodiment.

[0061] Figure 29 This is a diagram showing another example of the main magnet in the seventh embodiment.

[0062] Figure 30 This is a diagram showing an example of an auxiliary magnet according to the seventh embodiment.

[0063] Figure 31 This is a longitudinal sectional view showing an example of the electric motor according to the seventh embodiment.

[0064] Figure 32 This is a longitudinal sectional view showing another example of the electric motor according to the seventh embodiment.

[0065] Figure 33 This is a longitudinal sectional view showing another further example of the electric motor according to the seventh embodiment.

[0066] Figure 34 This is a cross-sectional view showing an example of an electric motor according to the eighth embodiment.

[0067] Figure 35 This is a cross-sectional view showing an example of an electric motor according to the eighth embodiment.

[0068] Figure 36 This is a perspective view showing an example of the rotor of the eighth embodiment.

[0069] Figure 37 This is an exploded perspective view showing an example of the rotor of the eighth embodiment.

[0070] Figure 38 This is a diagram showing an example of the main magnet of the eighth embodiment.

[0071] Figure 39 This is a diagram showing an example of an auxiliary magnet according to the eighth embodiment.

[0072] Figure 40 This is a longitudinal sectional view showing an example of the electric motor according to the eighth embodiment.

[0073] Figure 41 This is a cross-sectional view showing an example of the electric motor according to the ninth embodiment.

[0074] Figure 42 This is a cross-sectional view showing an example of the electric motor according to the ninth embodiment.

[0075] Figure 43 This is a longitudinal sectional view showing an example of the electric motor according to the ninth embodiment.

[0076] Figure 44 This is a diagram showing an example of an air conditioner equipped with an electric motor. Detailed Implementation

[0077] The embodiments will now be described with reference to the accompanying drawings.

[0078] [First Implementation Method]

[0079] The first embodiment will be described.

[0080] <Basic Components of an Electric Motor>

[0081] First, refer to Figures 1-3 The basic structure of the electric motor 1 in the first embodiment will be described.

[0082] Figure 1 This is an exploded perspective view showing an example of the electric motor 1 according to the first embodiment. Specifically, Figure 1 This is a perspective view of the electric motor 1 showing the rotor 20 moving axially in a direction away from the stator 10. Figure 1 The rotating shaft assembly mounted on rotor 20 and rotating about the rotation axis AX is omitted. Figure 3 The diagram shows the back magnetic yoke 211 and short-circuit suppression components 25 and 26. Figure 2 This is an axial view showing an example of the rotor 20 of the first embodiment. Specifically, Figure 2 It shows Figure 1 The rotor 20 is viewed from the stator 10 from its axial lower side. The thick solid arrows in the figure indicate the flow of magnetic flux between the auxiliary magnets 23 and between the auxiliary magnets 24. Figure 2 The dashed arrows in the diagram indicate the magnetization direction (magnetization orientation) of auxiliary magnets 23 and 24. Figure 3 This is a cross-sectional view showing an example of the electric motor 1 according to the first embodiment. Specifically, Figure 3 Is with Figure 2 The sectional view (longitudinal view) of motor 1 corresponding to line AA. Figure 3 The thick solid arrows in the figure indicate the flow of magnetic flux between the auxiliary magnets 23 and 24 and the main magnet 22, as well as the flow of magnetic flux between the main magnet 22 and the stator 10. The dashed arrows in the figure indicate the magnetization direction (magnetization orientation) of the main magnet 22 and the auxiliary magnets 23 and 24.

[0083] The electric motor (also referred to as "motor") 1 in the first embodiment is, for example, a compressor or blower mounted in an air conditioner (an example of a refrigeration unit). Hereinafter, the electric motor 1 in the second to fourth embodiments described later may also be the same.

[0084] like Figure 1 As shown, the electric motor 1 includes a stator 10 and a rotor 20. The electric motor 1 of the first embodiment is a so-called axial gap type in which the stator 10 and the rotor 20 are opposite each other in an axial direction (an example of a first direction) with a predetermined gap (also called an "air gap").

[0085] The stator 10 is the armature, which is fixed to a housing (not shown). For example... Figure 1 , Figure 3 As shown, the stator 10 includes a stator core 11 and a winding 12.

[0086] The stator core 11 is formed of a strongly magnetic material, such as an electromagnetic steel sheet, cast iron, or a powder-pressed magnetic core. The stator core 11 includes a back magnetic yoke 11A and multiple teeth 11B.

[0087] The back magnetic yoke 11A, in axial view, has a generally annular shape centered on the rotation axis AX of the motor 1, and has a through hole centered on the rotation axis AX. "Generally" is intended to allow for manufacturing tolerances, and will be used in the same sense in the following description. Thus, a rotating shaft component mounted on the rotor 20 can pass through the through hole, supporting the rotating shaft component at both ends of the motor 1 in the axial direction so that it can rotate around the rotation axis AX. The back magnetic yoke 11A magnetically short-circuits the plurality of teeth 11B wound by the winding 12, thereby forming a magnetic circuit based on the magnetic field of the current flowing through each winding 12.

[0088] Multiple (15 in this example) teeth 11B are arranged circumferentially at equal intervals in the face of the back magnetic yoke 11A opposite to the rotor 20 in an axially projecting manner.

[0089] The winding 12 is wound around each of the plurality of teeth 11B. An insulating component, such as an insulating film made of PET (Polyethylene Terephthalate), is provided between the winding 12 and the teeth 11B.

[0090] It should be noted that the number of teeth 11B can be less than 14 or more than 16.

[0091] The rotor 20 is an excitation element, and as described above, it is arranged opposite the stator 10 with a predetermined gap in the axial direction, and is capable of rotating in a circumferential direction (an example of a second direction) orthogonal to the direction (axial direction) opposite to the stator 10. The rotor 20 is mounted on a rotating shaft component (not shown), which is supported, for example, by bearings provided at both ends, in a manner that allows it to rotate relative to a fixed part such as a housing. Thus, the rotor 20 is configured by the rotating shaft component to rotate relative to a fixed part such as the housing of the motor 1. Figures 1-3 As shown, the rotor 20 includes a rotor core 21, multiple main magnets 22, multiple auxiliary magnets 23, multiple auxiliary magnets 24, a short-circuit suppression component 25, and a short-circuit suppression component 26.

[0092] The rotor core 21 is a component of the magnetic circuit that forms the magnetic fields of the main magnet 22 and the auxiliary magnets 23 and 24. The rotor core 21 is formed from a strongly magnetic material, such as electromagnetic steel sheet, cast iron, or pressed powder core. Figures 1-3As shown, the rotor core 21 includes a back magnetic yoke 211, an inner ring 212, and an outer ring 213.

[0093] The back yoke 211 (an example of the first component) is disposed adjacent to the side of the main magnet 22 opposite to the side opposite to the stator 10 in the axial direction. In axial view, the back yoke 211 has an annular shape that covers approximately the same radial range as the main magnet 22. That is, the back yoke 211 is radially positioned such that its inner and outer circumferential surfaces, centered on the rotation axis AX, are approximately aligned with the inner and outer circumferential surfaces of the main magnet 22, respectively. The back yoke 211 serves as the magnetic path for the magnetic flux between the multiple main magnets 22.

[0094] The inner ring portion 212 is arranged radially adjacent to the auxiliary magnet 23 on its inner side. The inner ring portion 212 has a generally annular shape in axial view. Furthermore, the inner ring portion 212 has a thickness approximately the same in the axial direction as the auxiliary magnet 23, and is arranged to occupy a range approximately the same in the axial direction as the auxiliary magnet 23. That is, the surface of the auxiliary magnet 23 facing the stator 10 in the axial direction and the surface of the inner ring portion 212 facing the stator 10 in the axial direction are approximately aligned (approximately flush). Figure 1 , Figure 2 As shown, the inner ring portion 212 is configured as a single component in the circumferential direction, for example. Alternatively, the inner ring portion 212 may be composed of multiple components in the circumferential direction. For example... Figure 2 As shown, the inner ring 212 is used as a magnetic circuit between the magnetic poles of the auxiliary magnet 23 that are adjacent in the radial direction.

[0095] The outer ring portion 213 is disposed adjacent to the auxiliary magnet 24 on its radially outer side. The outer ring portion 213 has a generally annular shape in axial view. Furthermore, the outer ring portion 213 has a thickness approximately the same along the axial direction as the auxiliary magnet 24, and is arranged to occupy the same axial range as the auxiliary magnet 24. That is, the surface of the auxiliary magnet 24 facing the stator 10 in the axial direction and the surface of the outer ring portion 213 facing the stator 10 in the axial direction are approximately aligned (approximately flush). Figure 2 As shown, the outer ring 213 is used as a magnetic circuit between the magnetic poles of the auxiliary magnet 24 that are adjacent in the radial direction.

[0096] Multiple (ten in this example) main magnets 22 (an example of the first magnet) are arranged circumferentially around the rotation axis AX, covering the entire circumference. Additionally, as... Figure 3 As shown, the main magnet 22 is arranged axially opposite to the teeth 11B of the stator 10. Figure 1 , Figure 2As shown, for example, multiple main magnets 22 are arranged such that adjacent main magnets 22 are connected to each other. Each of the multiple main magnets 22 has a generally fan-shaped shape in axial view, and is arranged such that they occupy approximately the same radial range centered on the rotation axis AX and occupy approximately the same angular width (i.e., circumferential width). That is, the multiple main magnets 22 can have approximately the same shape. Figure 3 As shown, the multiple main magnets 22 are axially magnetized permanent magnets, each having magnetic poles (N pole and S pole) of different polarities on the surface opposite to the stator 10 and on the opposite surface (an example of the first and fourth magnetic poles). Furthermore, as... Figure 2 As shown, the multiple main magnets 22 are arranged such that the magnetic poles on the faces opposite to the stator 10 are arranged differently in the circumferential direction between two adjacent main magnets 22, that is, the S pole and N pole are alternately arranged on the circumferential faces opposite to the stator 10. The main magnets 22 are, for example, neodymium sintered magnets, ferrite magnets, etc.

[0097] It should be noted that the number of main magnets 22 can be 9 or less, or 11 or more. The same applies to the second to fourth embodiments described below.

[0098] Multiple (ten in this example) auxiliary magnets 23 (an example of a second magnet) are arranged circumferentially adjacent to each other on the inner side of the main magnet 22 in the radial direction (an example of a third direction). Additionally, as... Figure 3 As shown, the auxiliary magnet 23 is arranged so that it is not axially opposite to the teeth 11B of the stator 10. The auxiliary magnet 23, together with the main magnet 22, forms a Heilbeck array, which relatively increases the magnetic flux of the poles of the main magnet 22 on the axial side opposite to the stator 10. As a result, the output of the motor 1 can be improved.

[0099] Multiple auxiliary magnets 23, when viewed from the axial direction, each have a roughly fan-shaped angular range comparable to that occupied by the main magnet 22 in the circumferential direction. Each auxiliary magnet 23 is a permanent magnet radially magnetized orthogonal to the magnetization direction (axial direction) of the main magnet 22, and has magnetic poles (N pole and S pole) of different polarities on its radially outer and inner sides (an example of a second and third magnetic pole). One auxiliary magnet 23, radially magnetized as an N pole on its outer side, is arranged radially adjacent to the main magnet 22, whose axial surface is magnetized as an N pole on the surface opposite to the stator 10, on its inner side. Conversely, another auxiliary magnet 23, radially magnetized as an S pole on its outer side, is arranged radially adjacent to the main magnet 22, whose axial surface is magnetized as an S pole on the surface opposite to the stator 10, on its inner side. This increases (strengthens) the magnetic flux of the poles on the surface of the main magnet 22 opposite to the stator 10. The auxiliary magnets 23 are, for example, neodymium sintered magnets, ferrite magnets, etc.

[0100] Multiple (ten in this example) auxiliary magnets 24 are arranged circumferentially adjacent to each other radially outward from the main magnet 22. Additionally, as... Figure 3 As shown, the auxiliary magnet 24 is arranged so that it is not axially opposite to the teeth 11B of the stator 10. Like the auxiliary magnet 23, the auxiliary magnet 24, together with the main magnet 22, forms a Heilbeck array, thereby relatively increasing the magnetic flux of the poles of the main magnet 22 on the axial side opposite to the stator 10. This improves the output of the motor 1.

[0101] Multiple auxiliary magnets 24, when viewed from the axial direction, each have a roughly fan-shaped angular range comparable to that occupied by the main magnet 22 in the circumferential direction. The auxiliary magnets 24 are radially magnetized, each having magnetic poles (N pole and S pole) with different polarities on their inner and outer sides (an example of a second and third magnetic pole). One auxiliary magnet 24, radially magnetized to the inner side as an N pole, is arranged adjacent to the main magnet 22, whose axial surface is magnetized to the N pole, on the outer side. Conversely, another auxiliary magnet 24, radially magnetized to the inner side as an S pole, is arranged adjacent to the main magnet 22, whose axial surface is magnetized to the S pole, on the outer side. This increases (strengthens) the magnetic flux of the poles on the axial surface of the main magnet 22 opposite to the stator 10. The auxiliary magnets 24 are, for example, neodymium sintered magnets or ferrite magnets.

[0102] The short-circuit suppression member 25 (an example of a short-circuit suppression section) is, for example, a non-magnetic body, formed of a material having a relatively high magnetic reluctance compared to the components constituting the magnetic circuit in the rotor 20, such as the back yoke 211. The short-circuit suppression member 25 is disposed adjacent to the side of the auxiliary magnet 23 opposite to the surface facing the stator 10 in the axial direction. In axial view, the short-circuit suppression member 25 has an annular shape that covers approximately the same radial range as the inner ring 212 and the auxiliary magnet 23. That is, the short-circuit suppression member 25 is radially positioned such that its inner and outer circumferential surfaces, centered on the rotation axis AX, are approximately aligned with the inner circumferential surface of the inner ring 212 and the outer circumferential surface of the auxiliary magnet 23, respectively, and is disposed radially adjacent to the back yoke 211 on its inner side. Furthermore, the short-circuit suppression member 25 and the back yoke 211 have approximately the same thickness in the axial direction.

[0103] The short-circuit suppression member 26 (an example of a short-circuit suppression section) is, for example, a non-magnetic body, formed of a material having a relatively high magnetic reluctance compared to the components constituting the magnetic circuit in the rotor 20, such as the back yoke 211. The short-circuit suppression member 26 is disposed adjacent to the side of the auxiliary magnet 24 opposite to the surface facing the stator 10 in the axial direction. In axial view, the short-circuit suppression member 26 has an annular shape that covers approximately the same radial range as the auxiliary magnet 24 and the outer ring portion 213. That is, the short-circuit suppression member 26 is radially positioned such that its inner and outer circumferential surfaces, centered on the rotation axis AX, are approximately aligned with the inner circumferential surface of the auxiliary magnet 24 and the outer circumferential surface of the outer ring portion 213, respectively, and is disposed radially adjacent to the back yoke 211 on the outer side. Furthermore, the short-circuit suppression member 26 and the back yoke 211 have approximately the same thickness in the axial direction.

[0104] <Methods for suppressing short-circuit magnetic flux of auxiliary magnets>

[0105] Next, besides Figures 1-3 In addition, refer to Figure 4 The method for suppressing the short-circuit magnetic flux of the auxiliary magnets 23 and 24 of the electric motor 1 in the first embodiment will be described.

[0106] Figure 4 This is a cross-sectional view showing the electric motor 1c, a comparative example. Specifically, Figure 4 and Figure 3 The same view is a longitudinal sectional view of motor 1c. Figure 4 The thick solid arrows without reference numerals in the figures indicate the flow of magnetic flux between the auxiliary magnets 23, 24 and the main magnet 22, and between the main magnet 22 and the stator 10. The comparative example motor 1c differs from the motor 1 of the first embodiment in that the short-circuit suppression components 25, 26 are omitted, and the back magnetic yoke 211 is replaced by a back magnetic yoke 211c.

[0107] like Figure 4 As shown, the back yoke 211c of the comparative example motor 1c is arranged adjacent to the inner ring 212, auxiliary magnet 23, main magnet 22, auxiliary magnet 24, and the outer ring 213 on the side opposite to the surface opposite to the stator 10, and covers the entire radial range of these components. Furthermore, the back yoke 211c is the same as the back yoke 211 of the motor 1, and is formed, for example, of a strongly magnetic material, with relatively low magnetic reluctance. Therefore, the back yoke 211c can generate a short-circuit magnetic flux (hereinafter referred to as "short-circuit flux") between a pair of poles of the auxiliary magnet 23 and between a pair of poles of the auxiliary magnet 24. Therefore, there is a possibility that the effect of the auxiliary magnets 23 and 24 on increasing the magnetic flux of the main magnet 22 on the axial side opposite to the stator 10 is relatively reduced.

[0108] In contrast, such as Figure 3 As shown, in the motor 1 of the first embodiment, in the axial direction, short-circuit suppression components 25 and 26 with relatively high magnetic resistance compared to the components constituting the magnetic circuit of the rotor 20, such as the back magnetic yoke 211, are provided on the side opposite to the surface of the auxiliary magnets 23 and 24 that are opposite to the surface of the stator 10.

[0109] Therefore, in the portion surrounding the auxiliary magnets 23 and 24 that faces the imaginary line (in radially extending lines) connecting the pair of magnetic poles inside the auxiliary magnets 23 and 24, a state with relatively high magnetic reluctance compared to components constituting the magnetic circuit of the rotor 20, such as the back yoke 211, can be achieved. Thus, short-circuit flux between the pair of magnetic poles of the auxiliary magnets 23 and 24 can be suppressed, further increasing the magnetic flux of the main magnet 22's poles on the axial side opposite the stator 10. Therefore, the output of the motor 1 can be further increased.

[0110] [Second Implementation]

[0111] Next, the second embodiment will be described.

[0112] The following description focuses on the parts that differ from the first embodiment, and sometimes omits descriptions of parts that are the same as or correspond to those in the first embodiment. Furthermore, since the basic structure of the motor 1 in the second embodiment is substantially the same as that in the first embodiment, its description is omitted, and will be referenced in the following description of the motor 1 in the second embodiment. Figure 1 , Figure 2 .

[0113] <Methods for suppressing short-circuit magnetic flux of auxiliary magnets>

[0114] Reference Figure 5 , Figure 6 The method for suppressing the short-circuit magnetic flux of the auxiliary magnets 23 and 24 of the electric motor 1 in the second embodiment will be described.

[0115] Figure 5 , Figure 6 These are cross-sectional views illustrating one example and another example of the electric motor 1 according to the second embodiment. Specifically, Figure 5 , Figure 6 This relates to one example and another example of the electric motor 1 in the second embodiment. Figure 2 AA section view (longitudinal section view). Figure 5 , Figure 6 The thick solid arrows in the figure indicate the flow of magnetic flux between the auxiliary magnets 23 and 24 and the main magnet 22, as well as the flow of magnetic flux between the main magnet 22 and the stator 10. The dashed arrows in the figure indicate the magnetization direction (magnetization orientation) of the main magnet 22 and the auxiliary magnets 23 and 24.

[0116] like Figure 5 , Figure 6 As shown, in the motor 1 of the second embodiment, a space without components is provided on the side opposite to the surface of the auxiliary magnets 23 and 24 that is axially opposite to the surface of the stator 10, instead of the short-circuit suppression components 25 and 26.

[0117] For example, such as Figure 5 As shown, in this example, the back yoke 211 of the motor 1 is arranged adjacent to the inner ring 212, auxiliary magnet 23, main magnet 22, auxiliary magnet 24, and outer ring 213 on the side opposite to the surface opposite to the stator 10, and covers the entire radial range of these components. In the back yoke 211, recesses are provided in the portions facing the auxiliary magnet 23 and the auxiliary magnet 24 in the entire radial range. Therefore, gaps 25A and 26A (short-circuit suppression portions, an example of spaces without components) with higher magnetic reluctance than the components constituting the magnetic circuit of the rotor 20, such as the back yoke 211, are provided in the portions facing the imaginary lines connecting the inner poles of the auxiliary magnets 23 and 24. Thus, short-circuit flux between the pair of poles of the auxiliary magnets 23 and 24 can be suppressed.

[0118] Additionally, for example, such as Figure 6 As shown, in the electric motor 1 of this example, spaces 25B and 26B without any components are provided in the portion where the short-circuit suppression components 25 and 26 of the first embodiment are installed (an example of a short-circuit suppression section without any components). Therefore, the magnetic reluctance of spaces 25B and 26B facing each other parallel to the imaginary lines connecting the pair of magnetic poles inside the auxiliary magnets 23 and 24 can be set higher than that of components constituting the magnetic circuit of the rotor 20, such as the back yoke 211. Therefore, short-circuit magnetic flux between the pair of magnetic poles of the auxiliary magnets 23 and 24 can be suppressed.

[0119] Thus, in the electric motor 1 of the second embodiment, a space without components is provided around the auxiliary magnets 23 and 24, in the portion where the imaginary line (a radially extending line) connecting the inner poles of the auxiliary magnets 23 and 24 is parallel to each other. This suppresses short-circuit flux between the pair of poles of the auxiliary magnets 23 and 24, further increasing the flux of the poles of the main magnet 22 on the side opposite the stator 10 in the axial direction. Therefore, the output of the electric motor 1 can be further increased.

[0120] [Third Implementation Method]

[0121] Next, the third implementation method will be described.

[0122] The following description focuses on the parts that differ from the first embodiment, sometimes simplifying or omitting descriptions of content that is the same as or corresponds to the first embodiment. Furthermore, the electric motor 1 of the third embodiment differs only in the configuration of the stator 10 and the rotor 20 within the rotor 20. Therefore, descriptions equivalent to... Figure 1 An exploded perspective view of the electric motor 1, including the stator 10 and the rotor 20, citing... Figure 1 The electric motor 1 of the third embodiment will be described.

[0123] <Basic Components of an Electric Motor>

[0124] Reference Figure 7 , Figure 8 The basic structure of the electric motor 1 in the third embodiment will be explained.

[0125] Figure 7 This is an axial view showing an example of the rotor 20 according to the third embodiment. Specifically, Figure 7 It shows the equivalent of Figure 1 The rotor 20 as viewed from the stator 10 from the lower axial side of the exploded three-dimensional view. Figure 7 The thick solid arrows in the text indicate the magnetization orientation (magnetization direction) of auxiliary magnets 23 and 24. Figure 8 This is a cross-sectional view showing an example of the electric motor 1 according to the third embodiment. Specifically, Figure 8 Is with Figure 7 The sectional view (longitudinal view) of motor 1 corresponding to the BB line. Figure 8 The thick solid arrows in the image represent the flow of magnetic flux between the auxiliary magnets 23 and 24 and the main magnet 22, as well as the flow of magnetic flux between the main magnet 22 and the stator 10. Figure 8 The dashed arrow in the figure indicates the magnetization direction (magnetization orientation) of the main magnet 22.

[0126] like Figure 7 , Figure 8 As shown, the rotor 20 of the third embodiment is the same as that of the first embodiment, including rotor core 21, multiple main magnets 22, auxiliary magnets 23, auxiliary magnets 24, short circuit suppression component 25, and short circuit suppression component 26.

[0127] The rotor core 21 includes a back magnetic yoke 211, which, unlike the first embodiment, omits the inner ring 212 and the outer ring 213.

[0128] The auxiliary magnet 23 is a ring magnet consisting of a single component. Unlike the first embodiment, the auxiliary magnet 23 is magnetized with an anisotropic magnetization orientation, orthogonal to the magnetization direction (axial direction) of the main magnet 22. Specifically, the auxiliary magnet 23 has a pair of magnetic poles (N pole and S pole) with opposite polarities on its radially outer side (an example of a second and third magnetic pole), and has a magnetic circuit structure of a Helbeck array with no leakage flux toward the radially inner side. Thus, the component forming the magnetic circuit on the radially inner side of the auxiliary magnet 23 (i.e., the inner ring portion 212 in the first embodiment) can be omitted.

[0129] The auxiliary magnet 23 has multiple sets (five sets in this example) of circumferentially separated pairs of magnetic poles (N pole and S pole) on its radially outer side. Specifically, the auxiliary magnet 23 has the same number of magnetic poles (10 in this example) as the main magnet 22, arranged circumferentially with adjacent poles having different polarities. The auxiliary magnet 23 is arranged such that each N pole and S pole is radially adjacent to the main magnet 22, which is magnetized as N pole and S pole on the axial side opposite to the stator 10. Thus, the auxiliary magnet 23 can increase (strengthen) the magnetic flux of the magnetic poles of the two main magnets 22 on the axial side opposite to the stator 10. In addition, as Figure 8 As shown, the auxiliary magnet 23 is arranged in such a way that it is not axially opposite to the tooth 11B of the stator 10.

[0130] The auxiliary magnet 24 is a ring magnet consisting of a single component. Unlike the first embodiment, the auxiliary magnet 24 is magnetized with an anisotropic magnetization orientation. Specifically, the auxiliary magnet 24 has a pair of magnetic poles on its radially inner side and a magnetic circuit structure of a Helbeck array that does not have leakage flux to the radially outer side. As a result, the component forming the magnetic circuit on the radially outer side of the auxiliary magnet 24 (i.e., the outer ring portion 213 of the first embodiment) can be omitted.

[0131] The auxiliary magnet 24 has a pair of circumferentially separated magnetic poles (N pole and S pole) on its radially inner side. The auxiliary magnet 24 is arranged such that the respective N pole and S pole are radially adjacent to the main magnet 22, which is magnetized as N pole and S pole on the axial side opposite to the stator 10. Therefore, the auxiliary magnet 24 can increase (strengthen) the magnetic flux of the magnetic poles of the two main magnets 22 on the axial side opposite to the stator 10. Furthermore, as... Figure 8 As shown, the auxiliary magnet 24 is arranged in such a way that it is not axially opposite to the teeth 11B of the stator 10.

[0132] Unlike the first embodiment, the short-circuit suppression member 25 has an annular shape that covers approximately the same radial range as the area where the auxiliary magnet 23 is located, in axial view. Specifically, the short-circuit suppression member 25 has an inner and outer circumferential surface that are approximately aligned with the inner and outer circumferential surfaces of the auxiliary magnet 23 in the radial direction, and is arranged adjacent to the back yoke 211 radially. This is because the inner ring portion 212 is omitted compared to the first embodiment.

[0133] Unlike the first embodiment, the short-circuit suppression member 26 has an annular shape that covers approximately the same radial range as the area where the auxiliary magnet 24 is located, in axial view. Specifically, the short-circuit suppression member 26 has an inner and outer circumferential surface that are approximately aligned with the inner and outer circumferential surfaces of the auxiliary magnet 24 in the radial direction, and is arranged adjacent to the back yoke 211 in the radial direction. This is because the outer ring portion 213 is omitted compared to the first embodiment.

[0134] Thus, in the electric motor 1 of the third embodiment, auxiliary magnets 23 and 24, which are magnetized with anisotropic magnetization orientation, are utilized. As a result, the components constituting the inner and outer radial magnetic circuits of the auxiliary magnets 23 and 24 (the inner ring portion 212 and outer ring portion 213 of the first embodiment) can be omitted. Therefore, the radial dimension of the electric motor 1 can be miniaturized.

[0135] [Fourth Implementation Method]

[0136] Next, the fourth embodiment will be described.

[0137] The following description focuses on the parts that differ from the first embodiment, sometimes simplifying or omitting descriptions of content that is the same as or corresponds to the first embodiment. Furthermore, the electric motor 1 of the fourth embodiment differs from the first embodiment only in the configuration of the stator 10 and the rotor 20 within the rotor 20. Therefore, descriptions equivalent to... Figure 1 An exploded perspective view of the electric motor 1, including the stator 10 and the rotor 20, citing... Figure 1 The electric motor 1 of the fourth embodiment will be described.

[0138] <Basic Components of an Electric Motor>

[0139] First, refer to Figure 9 , Figure 10 The basic structure of the electric motor 1 in the fourth embodiment will be explained.

[0140] Figure 9 This is an axial view showing an example of the configuration of the rotor 20 according to the fourth embodiment. Specifically, Figure 9 It shows the equivalent of Figure 1 The rotor 20 of the fourth embodiment, viewed from the lower axial side of the exploded perspective view, i.e., from the stator 10. Figure 9 The dashed arrow in the figure indicates the magnetization direction (magnetization orientation) of the auxiliary magnet 27. Figure 10 This is a cross-sectional view showing an example of the electric motor 1 according to the fourth embodiment. Specifically, Figure 10 Is with Figure 9 The circumferential sectional view of motor 1 corresponding to the CC line. Figure 10 The thick solid arrows in the image indicate the flow of magnetic flux between the auxiliary magnet 27 and the main magnet 22, as well as the flow of magnetic flux between the main magnet 22 and the stator 10. Figure 10 The dashed arrows in the diagram indicate the magnetization direction (magnetization orientation) of the main magnet 22 and the auxiliary magnet 27.

[0141] like Figure 9 , Figure 10 As shown, the rotor 20 of the fourth embodiment includes a rotor core 21, a plurality of main magnets 22, a plurality of auxiliary magnets 27, and a short-circuit suppression component 28.

[0142] The rotor core 21 includes a back magnetic yoke 211.

[0143] The back yoke 211 is disposed adjacent to the side of the main magnet 22 opposite to the side opposite to the stator 10 in the axial direction. The back yoke 211 has an annular shape in axial view, covering approximately the same radial range as the main magnet 22. The back yoke 211 serves as a magnetic path for the magnetic flux between the multiple main magnets 22. Additionally, a recess is provided in the back yoke 211 to accommodate a short-circuit suppression member 28.

[0144] Multiple (ten in this example) main magnets 22 are arranged circumferentially at relatively large equal intervals. Additionally, as... Figure 10 As shown, the main magnets 22 are arranged axially opposite to the teeth 11B of the stator 10. Each of the multiple main magnets 22 has a generally fan-shaped shape in axial view, arranged to occupy the same angular width (the same circumferential width) centered on the rotation axis AX. The multiple main magnets 22 are axially magnetized permanent magnets, arranged such that the magnetic poles on the faces opposite to the stator 10 are arranged differently between circumferentially adjacent main magnets, i.e., the S pole and N pole are alternately arranged circumferentially on the faces opposite to the stator 10. The main magnets 22 are, for example, neodymium sintered magnets, ferrite magnets, etc.

[0145] Multiple (ten in this example) auxiliary magnets 27 (an example of a second magnet) are arranged adjacent to each other at the circumferential (a third-direction example) ends of the main magnet 22. Additionally, as... Figure 10As shown, the auxiliary magnet 27 is arranged axially opposite to the teeth 11B of the stator 10. The auxiliary magnet 27, together with the main magnet 22, forms a Heilbeck array, thereby relatively increasing the magnetic flux of the poles of the main magnet 22 on the axial side opposite to the stator 10. This allows for an increase in the output of the motor 1.

[0146] Multiple auxiliary magnets 27 are respectively disposed between two circumferentially adjacent main magnets 22. Each auxiliary magnet 27 has a fan shape in axial view and is arranged at circumferential intervals (angular widths) to accommodate the two adjacent main magnets 22. Each auxiliary magnet 27 is a permanent magnet circumferentially magnetized orthogonal to the magnetization direction (axial direction) of the main magnets 22, and has magnetic poles (N pole and S pole) of different polarities (an example of a second magnetic pole and an example of a third magnetic pole) on one and the other end faces of the circumferential direction. The auxiliary magnets 27 are configured such that their N poles are adjacent to the circumferential ends of the main magnets 22 magnetized as N poles on the surface opposite the stator 10 in the axial direction, and their S poles are adjacent to the circumferential ends of the main magnets 22 magnetized as S poles on the surface opposite the stator 10 in the axial direction. Thus, the auxiliary magnets 27 can increase the magnetic flux of the magnetic poles of the main magnets 22 on the surface opposite the stator 10. The auxiliary magnets 27 are, for example, neodymium sintered magnets, ferrite magnets, etc.

[0147] The short-circuit suppression component 28 (an example of a short-circuit suppression section) is, for example, a non-magnetic body formed of a material with relatively high magnetic reluctance compared to components constituting the magnetic circuit in the rotor 20, such as the back yoke 211. The short-circuit suppression component 28 is arranged adjacent to the side of the auxiliary magnet 27 opposite to the side facing the stator 10, such that it covers approximately the same area as the auxiliary magnet 27 in axial view. That is, the short-circuit suppression component 28 has the same number as the auxiliary magnet 27 (10 in this example) and has a roughly fan-shaped area occupying the same area as the auxiliary magnet 27 in axial view. The short-circuit suppression component 28 is provided in axial view to be accommodated in a recess of the back yoke 211 having the same shape.

[0148] <Methods for suppressing short-circuit magnetic flux of auxiliary magnets>

[0149] Next, continue to refer to Figure 10 The method for suppressing the short-circuit magnetic flux of the auxiliary magnet 27 of the electric motor 1 in the fourth embodiment will be described.

[0150] like Figure 10As shown, short-circuit suppression members 28, which have a higher magnetic reluctance than components constituting the magnetic circuit of the rotor 20 such as the back yoke 211, are arranged adjacent to the auxiliary magnet 27 on the side opposite to the surface opposite to the stator 10 in the axial direction. Therefore, in the portion surrounding the auxiliary magnet 27, facing the imaginary line (an arc line centered on the rotation axis AX) connecting the pair of magnetic poles inside the auxiliary magnet 27, a state with relatively higher magnetic reluctance compared to components constituting the magnetic circuit of the rotor 20 such as the back yoke 211 can be achieved. Thus, short-circuit flux between the pair of magnetic poles of the auxiliary magnet 27 can be suppressed. Therefore, the magnetic flux of the poles of the main magnet 22 on the surface opposite to the stator 10 can be further increased using the auxiliary magnet 27.

[0151] [Fifth Implementation]

[0152] Next, the fifth embodiment will be described.

[0153] <Basic Components of an Electric Motor>

[0154] First, refer to Figures 11-21 The basic configuration of the electric motor 1 in the fifth embodiment will be explained.

[0155] Figure 11 , Figure 12 This is a cross-sectional view showing an example of the electric motor 1 according to the fifth embodiment. Specifically, Figure 11 This is a cross-sectional view of the central part of the motor 1 along its axis. Figure 12 This is a cross-sectional view of the axial end of motor 1. Figure 13 This is a perspective view showing an example of the rotor 40 of the fifth embodiment. Figure 14 This is an exploded perspective view showing an example of the rotor 40 according to the fifth embodiment. Figure 13 , Figure 14 The diagram depicts the axial extent of the rotor 40 from its central portion to one end, but omits the depiction of the extent from the central portion to the other end. Additionally, in... Figure 14 The depiction of the rotating shaft component 50 is omitted in the text. Figure 15 , Figure 16 This is a longitudinal sectional view showing an example of the electric motor 1 according to the fifth embodiment. Specifically, Figure 15 , Figure 16 These are examples of the electric motor 1 according to the fifth embodiment. Figure 11 , Figure 12 The sectional views corresponding to the DD line and EE line. Figure 15 , Figure 16 The thick solid arrows in the diagram indicate the flow of magnetic flux between the auxiliary magnet 43 and the main magnet 42, as well as the flow of magnetic flux between the main magnet 42 and the stator 30. Additionally, Figure 15The dashed arrow in the image indicates the magnetization direction (magnetization orientation) of the main magnet 42. Figure 16 The dashed arrows in the diagram indicate the magnetization direction (magnetization orientation) of the main magnet 42 and the auxiliary magnet 43. Figure 17 This is a cross-sectional view showing another example of the electric motor 1 according to the fifth embodiment. Specifically, Figure 17 This is a cross-sectional view of the axial end of motor 1. Figure 18 This is a perspective view showing another example of the rotor 40 of the fifth embodiment. Figure 19 This is an exploded perspective view showing another example of the rotor 40 according to the fifth embodiment. Figure 18 , Figure 19 The diagram depicts the axial extent of the rotor 40 from its central portion to one end, but omits the depiction of the extent from the central portion to the other end. Additionally, in... Figure 19 The depiction of the rotating shaft component 50 is omitted in the text. Figure 20 , Figure 21 This is a longitudinal sectional view showing another example of the electric motor 1 according to the fifth embodiment. Specifically, Figure 20 , Figure 21 These are another example of the electric motor 1 according to the fifth embodiment. Figure 17 The cross-sectional views corresponding to the GG line and HH line. Figure 20 , Figure 21 The thick solid arrows in the diagram indicate the flow of magnetic flux between the auxiliary magnet 43 and the main magnet 42, as well as the flow of magnetic flux between the main magnet 42 and the stator 30. Additionally, Figure 20 The dashed arrow in the image indicates the magnetization direction (magnetization orientation) of the main magnet 42. Figure 21 The dashed arrows in the diagram indicate the magnetization direction (magnetization orientation) of the main magnet 42 and the auxiliary magnet 43.

[0156] It should be noted that, due to the difference between the cross-sectional view of the central portion of the motor 1 in the fifth embodiment and the cross-sectional view of the central portion in the axial direction, the cross-sectional view of the motor 1 in the fifth embodiment is different. Figure 11 The same applies, therefore the illustration is omitted. Additionally, in Figure 12 , Figure 17 The diagram shows only a cross-sectional view of the motor 1 at the axial position where the rotor 40 is located in the stator 30 and rotor 40, depicting the state of the stator 30 as viewed from the axial direction and the cross-section of the rotor 40.

[0157] The electric motor 1 in the fifth embodiment is, for example, mounted on the blower or compressor of an air conditioner. Hereinafter, the electric motor 1 in the sixth to ninth embodiments described later may also be the same.

[0158] like Figures 11-21As shown, the motor 1 includes a stator 30, a rotor 40, and a rotating shaft assembly 50. The motor 1 of the fifth embodiment is a so-called radial gap type, in which the stator 30 and rotor 40 are positioned opposite each other with a predetermined gap (air gap) in the radial direction (an example in the first direction). Furthermore, the motor 1 of the fifth embodiment is a so-called interior permanent magnet type (IPM) in which the main magnet 42 is embedded in the main yoke 411 of the rotor 40.

[0159] The stator 30 is disposed on the outer periphery of the motor 1 and is fixed to a housing (not shown). The stator 30 includes a stator core 31 and windings 32.

[0160] The stator core 31 is formed of a strongly magnetic material, such as an electromagnet steel plate or a powder core. The stator core 31 includes a back yoke portion 31A having a generally cylindrical shape, and a plurality of teeth 31B that protrude radially from the inner circumference of the back yoke portion 31A.

[0161] Multiple teeth 31B are arranged at approximately equal intervals in the circumferential direction on the inner circumferential surface of the back magnetic yoke 31A. Between two circumferentially adjacent teeth 31B, slots (hereinafter referred to as "coil slots") are formed for accommodating the windings 32. In this example, six coil slots are formed.

[0162] The winding 32 is wound around each of the plurality of teeth 31B in a concentrated winding manner. An insulating component, such as an insulating film made of PET, is provided between the winding 32 and the teeth 31B.

[0163] It should be noted that the winding 32 can be wound across multiple teeth 31B by means of distributed winding. In addition, the number of teeth 31B, that is, the number of coil slots formed between two adjacent teeth 31B, can be less than five or more.

[0164] The rotor 40 is radially inner to the stator 30 and is configured to rotate in a circumferential direction (an example of a second direction) orthogonal to the radial direction. The rotor 40 includes a rotor core 41, a plurality of main magnets 42, a plurality of auxiliary magnets 43, and a short-circuit suppression component 44.

[0165] The rotor core 41 is a component of the rotor 40, forming the magnetic circuit of the magnetic field based on the current flowing through the winding 32 of the stator 30, and the magnetic field of the main magnet 42 and the auxiliary magnet 43. The rotor core 41 is formed of a strongly magnetic material, such as an electromagnet steel plate or a powder core. The rotor core 41 includes a main yoke 411 and an auxiliary yoke 412.

[0166] The main yoke 411 (an example of the first component) serves as a magnetic circuit based on the magnetic field of the current flowing through the winding 32 of the stator 30, and also as a magnetic circuit for the magnetic field of the main magnet 42. It has a generally cylindrical shape and is fixed to the rotating shaft component 50. (Example) Figure 14 As shown, a space (hereinafter referred to as a "main magnet slot") is provided in the rotor core 41 for embedding each of a plurality of main magnets 42. A void portion can be provided at the end of the main magnet slot in a direction orthogonal to the direction of the main magnetic flux of the main magnet 42, where the main magnet 42 is embedded. This void portion functions as a magnetic flux barrier to suppress short circuits of the magnetic flux at the end of the main magnet 42. Furthermore, the function of the magnetic flux barrier can be ensured by filling the void portion with a material whose permeability is lower than that of the rotor core 41.

[0167] The auxiliary yoke 412 forms a magnetic circuit for the magnetic field of the plurality of auxiliary magnets 43. As will be described later, the auxiliary yoke 412 is disposed adjacent to the outer side of each auxiliary magnet 43 located at both ends of the main magnet 42 along its axial direction.

[0168] For example, such as Figures 12-16 As shown, the auxiliary yoke 412 has an annular shape in an axial view, in a manner that covers a portion of each of the plurality of auxiliary magnets 43.

[0169] Additionally, for example, such as Figures 17-21 As shown, the auxiliary yoke 412 can be a disk-shaped component occupying the entire rotor 40 in axial view, and a through hole for the rotating shaft component 50 to pass through is provided in the center portion. In this example, the auxiliary yoke 412 is arranged at the end of the rotor 40 adjacent to a plurality of auxiliary magnets 43 and a short-circuit suppression component 44 in which the plurality of auxiliary magnets 43 are embedded.

[0170] Multiple (four in this example) main magnets 42 (an example of the first magnet) are embedded in the rotor core 41 (main yoke 411).

[0171] It should be noted that the number of main magnets 42 can be three or fewer, or five or more. The same applies to the sixth embodiment described below.

[0172] Multiple main magnets 42 are arranged at equal intervals in the circumferential direction at predetermined radial positions on the main yoke 411. Additionally, as... Figure 16 , Figure 21 As shown, the main magnet 42 is arranged radially opposite to the teeth 31B of the stator 30. The main magnet 42 is, for example, a neodymium sintered magnet, a ferrite magnet, etc.

[0173] The plurality of main magnets 42 are each arranged in a generally rectangular shape having one side sufficiently long relative to the other in axial view, with the long side being approximately centrally orthogonal to the radial direction. The plurality of main magnets 42 are magnetized such that they have magnetic poles (N pole and S pole) with different polarities at their two ends in the direction of the short side (an example of the first magnetic pole and the fourth magnetic pole).

[0174] The multiple main magnets 42 are arranged in a manner that the magnetic poles magnetized on the surface opposite to the stator 30 are different from those of the other main magnet 42 arranged circumferentially adjacent to it. For example, when the surface of one main magnet 42 opposite to the stator 30 is magnetized as the S pole, the surface of another main magnet 42 circumferentially adjacent to one main magnet 42 opposite to the stator 30 is magnetized as the N pole.

[0175] It should be noted that the main magnet 42 can have a shape other than an elongated rectangular shape when viewed from the axial direction. For example, the main magnet 42 can have a V-shaped or U-shaped shape that convexes radially inward when viewed from the axial direction. Furthermore, if the main magnet 42 has a V-shaped shape when viewed from the axial direction, the V-shape can be achieved by combining two magnet components with elongated rectangular shapes. In this case, the two magnet components are magnetically connected in parallel. If the main magnet 42 has a U-shaped shape when viewed from the axial direction, a U-shaped shape configured as a curve (i.e., an arc shape) can be achieved by using a single magnet component. Alternatively, a U-shaped shape can be achieved by combining multiple (e.g., three) magnet components with elongated rectangular shapes. In this case, the three magnet components are magnetically connected in parallel. Additionally, the main magnet 42 can be arranged in a radially connected series configuration.

[0176] Multiple (eight in this example) auxiliary magnets 43 (an example of a second magnet) are arranged adjacent to each other at both ends of the main magnet 42 along its axial direction. Additionally, as... Figure 16 , Figure 21 As shown, the auxiliary magnet 43 is arranged in a manner that does not radially oppose the teeth 31B of the stator 30. The auxiliary magnet 43 is, for example, a neodymium sintered magnet or a ferrite magnet. The auxiliary magnet 43 and the main magnet 42 together form a Heilbeck array, thereby relatively increasing the magnetic flux of the poles of the main magnet 42 on the side facing the stator 30. As a result, the output of the motor 1 can be increased.

[0177] The auxiliary magnet 43, in axial view, has a roughly elongated rectangular shape similar to the main magnet 42. Multiple auxiliary magnets 43 are magnetized axially in directions orthogonal to the magnetization direction of the main magnet 42, and have magnetic poles of different polarities (N pole and S pole) on their inner and outer sides (an example of a second and third magnetic pole). Specifically, the auxiliary magnet 43 is axially magnetized such that its pole is the same as the magnetic pole of the adjacent main magnet 42 on the radially opposite side of the stator 30, forming the inner side of the axial direction, i.e., the side adjacent to the main magnet 42. For example, as... Figure 16 As shown, when the magnetic pole of the radially opposite surface of the stator 30 is the N pole, the auxiliary magnets 43 at both ends of the axial direction are magnetized in the axial direction such that the inner end of the auxiliary magnet 43 is the N pole and the outer end is the S pole. Thus, the two auxiliary magnets 43 at both ends can increase (strengthen) the magnetic flux of the magnetic pole of the adjacent main magnet 42 on the surface opposite the stator 30.

[0178] The short-circuit suppression component 44 (an example of a short-circuit suppression part) is, for example, a non-magnetic body, which is formed of a material having relatively high magnetic resistance compared to the components constituting the magnetic circuit in the rotor 40, such as the main yoke 411.

[0179] For example, such as Figure 13 , Figure 14 As shown, the short-circuit suppression member 44 has a generally cylindrical shape arranged along the rotation axis AX, and is disposed at both ends of the main yoke 411 in the axial direction. In this example, in the short-circuit suppression member 44, a plurality of holes (four in this example) for embedding auxiliary magnets 43 are provided adjacent to the main yoke 411, which are elongated rectangular in shape in axial view, and holes for embedding auxiliary yoke 412, which are annular in axial view, are provided on the opposite side.

[0180] Additionally, for example, such as Figure 18 , Figure 19 As shown, the short-circuit suppression member 44 may have a generally cylindrical shape arranged along the rotation axis AX, and is arranged adjacent to the main yoke 411 and the auxiliary yoke 412 in the axial direction. In this example, a through hole for embedding the auxiliary magnet 43 is provided in the short-circuit suppression member 44, having a thickness in the same axial direction as the auxiliary magnet 43.

[0181] The rotating shaft assembly 50 is supported so that it can rotate relative to the housing of the motor 1. Thus, the rotor 40 (rotor core 41) fixed to the rotating shaft assembly 50 can rotate relative to the housing and the stator 30.

[0182] <Methods for suppressing short-circuit magnetic flux of auxiliary magnets>

[0183] Next, continue to refer to Figure 16 , Figure 21The method for suppressing the short-circuit magnetic flux of the auxiliary magnet 43 of the electric motor 1 in the fifth embodiment will be described.

[0184] like Figure 16 , Figure 21 As shown, on the auxiliary magnet 43, on the side opposite to the stator 30 and on the side opposite to it, short-circuit suppression components 44 with relatively high magnetic resistance compared to the components constituting the magnetic circuit of the rotor 40, such as the main yoke 411, are respectively arranged adjacent to each other.

[0185] Therefore, in the portion surrounding the auxiliary magnet 43, which faces the imaginary line (along the axial line) connecting the pair of magnetic poles inside the auxiliary magnet 43, a state with relatively high magnetic reluctance compared to components constituting the magnetic circuit of the rotor 40, such as the main yoke 411, can be achieved. Thus, short-circuit flux between the pair of magnetic poles of the auxiliary magnet 43 can be suppressed, further increasing the magnetic flux of the poles on the surface opposite the stator 30 of the main magnet 42. Therefore, the output of the motor 1 can be further improved.

[0186] [Sixth Implementation Method]

[0187] Next, the sixth embodiment will be described.

[0188] The following description focuses on the parts that differ from the fifth embodiment, and sometimes simplifies or omits the description of content that is the same as or corresponds to the fifth embodiment.

[0189] <Basic Components of an Electric Motor>

[0190] First, refer to Figure 22 , Figure 23 The basic structure of the electric motor 1 in the sixth embodiment will be explained.

[0191] Figure 22 This is a cross-sectional view of the electric motor 1 according to the sixth embodiment. Figure 22 The solid arrows in the diagram indicate the magnetization direction (magnetization orientation) of the main magnet 42 and the auxiliary magnet 43. Figure 23 This is a longitudinal sectional view of the electric motor 1 according to the sixth embodiment. Specifically, Figure 23 Is with Figure 22 The cross-sectional view of motor 1 corresponding to the FF line.

[0192] like Figure 22 , Figure 23 As shown, the rotor 40 includes a rotor core 41, multiple main magnets 42, multiple auxiliary magnets 46, a short-circuit suppression component 47, and a short-circuit suppression component 48.

[0193] The rotor core 41 has a generally cylindrical shape and is fixed to the rotating shaft component 50. A main magnet slot is provided in the rotor core 41 for embedding each of a plurality of main magnets 42. Additionally, at both ends of the main magnet slot in a direction orthogonal to the direction of the main magnetic flux of the main magnets 42, spaces (hereinafter referred to as "auxiliary magnet slots") are provided for embedding auxiliary magnets 46, short-circuit suppression components 47, and short-circuit suppression components 48. The main magnet slots and the auxiliary magnet slots are connected.

[0194] Multiple (eight in this example) auxiliary magnets 46 (an example of a second magnet) are embedded adjacently at the ends of the main magnet 42 in a direction orthogonal to the direction of the main magnetic flux (in this example, the direction of the long side of the elongated rectangular main magnet 42). Additionally, as... Figure 23 As shown, the auxiliary magnet 46 is arranged radially opposite to the teeth 31B of the stator 30. The auxiliary magnet 46 is, for example, a neodymium sintered magnet or a ferrite magnet. Together with the main magnet 42, the auxiliary magnet 46 forms a Helbeck array, which relatively increases the magnetic flux of the poles of the main magnet 42 facing the stator 30. Therefore, the electrical energy output of the motor 1 is increased. The auxiliary magnet 46 is, for example, a neodymium sintered magnet or a ferrite magnet.

[0195] The auxiliary magnet 46 is magnetized in a direction orthogonal to the direction of the main magnetic flux of the adjacent main magnet 42, and has magnetic poles (N pole and S pole) with different polarities on its adjacent and opposite sides (an example of a second and third magnetic pole). Specifically, the auxiliary magnet 46 is magnetized in the same way that the magnetic pole of the side adjacent to the main magnet 42 is the same as the magnetic pole of the side of the main magnet 42 opposite to the stator 30. For example, if the magnetic pole of the side of the main magnet 42 opposite to the stator 30 is N pole, the auxiliary magnets 46 at both ends in a direction orthogonal to the direction of the main magnetic flux of the main magnet 42 are magnetized in a direction orthogonal to the direction of the main magnetic flux of the main magnet 42, such that the magnetic pole of the side adjacent to the main magnet 42 is N pole. Similarly, when the magnetic pole of the surface of the main magnet 42 opposite to the stator 30 is the S pole, the auxiliary magnets 46 at both ends, in a direction orthogonal to the direction of the main magnetic flux of the main magnet 42, are magnetized in a direction orthogonal to the direction of the main magnetic flux of the main magnet 42, such that the magnetic pole of the surface adjacent to the main magnet 42 becomes the S pole. Thus, the two auxiliary magnets 46 at both ends can increase (strengthen) the magnetic flux of the magnetic pole of the surface of the adjacent main magnet 42 opposite to the stator 30.

[0196] The short-circuit suppression component 47 (an example of a short-circuit suppression part) is, for example, a non-magnetic material formed of a material having relatively high magnetic reluctance compared to components constituting the magnetic circuit in the rotor 40, such as the main yoke 411. The short-circuit suppression component 47 is embedded in the rotor core 41 in such a way that it covers the entire range of the auxiliary magnet 46 along the magnetization direction on the side opposite to the side of the auxiliary magnet 46 that is opposite to the side of the stator 30.

[0197] The short-circuit suppression component 48 (an example of a short-circuit suppression part) is the same as the short-circuit suppression component 47, for example, it is a non-magnetic body, and it is formed of a material with relatively high magnetic reluctance compared to the components constituting the magnetic circuit in the rotor 40, such as the main yoke 411. The short-circuit suppression component 48 is embedded in the rotor core 41 in such a way that it covers the entire range of the auxiliary magnet 46 along the magnetization direction relative to the surface of the auxiliary magnet 46 opposite to the stator 30.

[0198] <Methods for suppressing short-circuit magnetic flux of auxiliary magnets>

[0199] Next, continue to refer to Figure 22 , Figure 23 The method for suppressing the short-circuit magnetic flux of the auxiliary magnet 46 of the electric motor 1 in the sixth embodiment will be described.

[0200] like Figure 22 , Figure 23 As shown, short-circuit suppression components 48 and 47, which have relatively high magnetic resistance compared to the components constituting the magnetic circuit of the rotor 40, such as the main yoke 411, are respectively arranged adjacent to each other on the side of the auxiliary magnet 46 opposite to the stator 30.

[0201] Therefore, in the portion surrounding the auxiliary magnet 46 that faces the imaginary line (a line extending in a direction orthogonal to the main magnetic flux of the main magnet 42) connecting the pair of magnetic poles inside the auxiliary magnet 46, a state with relatively high magnetic reluctance compared to components constituting the magnetic circuit of the rotor 20, such as the main yoke 411, can be achieved. Thus, short-circuit magnetic flux between the pair of magnetic poles of the auxiliary magnet 46 can be suppressed, further increasing the magnetic flux of the magnetic poles of the main magnet 42 on the surface opposite the stator 10. Therefore, the output of the motor 1 can be further increased.

[0202] [Seventh Implementation Method]

[0203] Next, the seventh embodiment will be described.

[0204] The following description focuses on the parts that differ from the fifth and sixth embodiments, and sometimes simplifies or omits the description of the same or corresponding content as the fifth and sixth embodiments.

[0205] <Basic Components of an Electric Motor>

[0206] First, refer to Figures 24-33 The basic structure of the electric motor 1 in the seventh embodiment will be explained.

[0207] Figure 24 , Figure 25 This is a cross-sectional view showing an example of the electric motor 1 according to the seventh embodiment. Specifically, Figure 24 This is a cross-sectional view of the central part of the motor 1 along its axis. Figure 25 This is a cross-sectional view of the axial end of motor 1. Figure 26 This is a perspective view showing an example of the rotor 20 of the seventh embodiment. Figure 27 This is an exploded perspective view showing an example of the rotor 20 according to the seventh embodiment. Figure 26 , Figure 27 The diagram depicts the axial portion of the rotor 60 from the central portion to one end, while the portion from the central portion to the other end is omitted. Figure 28 , Figure 29 The figure shows an example of the main magnet 62 of the seventh embodiment and another example. Figure 28 , Figure 29 The dashed arrow indicates the magnetization direction (magnetization orientation) of the main magnet 62. Figure 30 This is a diagram showing an example of the auxiliary magnet 63 of the seventh embodiment. Figure 30 The dashed arrow indicates the magnetization direction (magnetization orientation) of the auxiliary magnet 63. Figures 31-33 This is a longitudinal sectional view showing one example, another example, and yet another example of the electric motor 1 according to the seventh embodiment. Specifically, Figures 31-33 Is with Figure 24 , 25 The sectional view corresponding to line II. Figures 31-33 The thick solid arrows in the text indicate the flow of magnetic flux between the auxiliary magnet 63 and the main magnet 62, as well as the flow of magnetic flux between the main magnet 62 and the stator 30. Figures 31-33 The dashed arrows in the diagram indicate the magnetization direction (magnetization orientation) of the main magnet 62 and the auxiliary magnet 63.

[0208] It should be noted that, in Figure 25 The image shows a cross-sectional view of the motor 1 at the axial position of the rotor 60, which consists only of the stator 30 and the rotor 60. The image depicts the state of the stator 30 as viewed from the axial direction and the cross-section of the rotor 60.

[0209] like Figures 24-32As shown, the electric motor 1 includes a stator 30, a rotor 60, and a rotating shaft component 50. The electric motor of the seventh embodiment is a so-called radial gap type, in which the stator 30 and rotor 60 are positioned opposite each other with a predetermined gap (air gap) in the radial direction (an example in the first direction). Furthermore, the electric motor 1 of the seventh embodiment is a so-called surface magnet type (SPM) in which a main magnet 62 is provided on the surface of the main yoke 611 of the rotor 60.

[0210] The stator 30 is disposed on the outer periphery of the motor 1 and is fixed to a housing (not shown). The stator 30 includes a stator core 31 and windings 32.

[0211] The rotor 60 is radially inner to the stator 30 and is configured to rotate in a circumferential direction (an example of a second direction) orthogonal to the direction (radial) opposite to the stator 30. The rotor 60 includes a rotor core 61, a plurality of main magnets 62, a plurality of auxiliary magnets 63, a short-circuit suppression component 64, and a protective tube 65.

[0212] The rotor core 61 is a component of the rotor 60, constituting the magnetic circuit of the magnetic field based on the current flowing through the winding 32 of the stator 30, and the magnetic field of the main magnet 62 and the auxiliary magnet 63. The rotor core 61 includes a main yoke 611 and an auxiliary yoke 612.

[0213] The main yoke 611 serves as a magnetic circuit for the magnetic field of the winding 32 of the stator 30 and the magnetic field of the main magnet 62. The main yoke 611 has a generally cylindrical shape with the rotation axis AX as its center. Specifically, the main yoke 611 is disposed at the axial center of the rotor 60 and has a generally cylindrical shape with a hole in the radial center through which the rotating shaft member 50 passes.

[0214] The auxiliary yoke 612 serves as the magnetic circuit for the magnetic field of the auxiliary magnet 63. The auxiliary yoke 612 is located at both axial ends of the rotor 60, and is arranged adjacent to the auxiliary magnet 63 and the short-circuit suppression member 64 on the outer side (end side) of the axial direction, such that it covers the area of ​​the auxiliary magnet 63 and the short-circuit suppression member 64 in axial view. The auxiliary yoke 612 has a generally cylindrical shape with the rotation axis AX as its center. Specifically, the auxiliary yoke 612 has a hole at its radial center for the rotation shaft member 50 to pass through, and has a generally cylindrical shape with a relatively small axial dimension.

[0215] The main magnet 62 is disposed adjacent to the surface of the main yoke 611, specifically on the radially outer side of the main yoke 611. Additionally, as... Figures 31-33As shown, the main magnet 62 is arranged radially opposite to the teeth 31B of the stator 30. The main magnet 62 has a generally cylindrical shape with the rotation axis AX as its center. Specifically, the main magnet 62 has the same axial dimension as the main yoke 611, and has a generally cylindrical shape with an inner diameter dimension equal to the outer diameter dimension of the main yoke 611, within the range where it can be fastened to the main yoke 611.

[0216] like Figure 28 , Figure 29 As shown, the main magnet 62 is a radially magnetized permanent magnet having magnetic poles (N pole and S pole) of different polarities on its inner and outer circumferential surfaces (an example of the first and fourth magnetic poles). Furthermore, the main magnet 62 is configured such that the combination of magnetic poles on its inner and outer circumferential surfaces differs circumferentially for each predetermined angle (e.g., each half-circumference). For example, as... Figure 28 As shown, the main magnet 62 is a single, magnetized permanent magnet. Additionally, for example, as... Figure 29 As shown, the main magnet 62 can be manufactured as follows: multiple (e.g., two) components arranged at each predetermined angle in the circumferential direction are magnetized for different combinations of polarities for each inner and outer circumferential surface, and multiple components as magnetized permanent magnets are connected in the circumferential direction.

[0217] The auxiliary magnet 63 is adjacent to the surface of the short-circuit suppression component 64, specifically to its radially outer side, and is disposed adjacent to both ends of the main magnet 62 in the axial direction. Additionally, as... Figures 31-33 As shown, the auxiliary magnet 63 is arranged in a manner that does not radially oppose the teeth 31B of the stator 30. The auxiliary magnet 63, together with the main magnet 62, forms a Heilbeck array, which relatively increases the magnetic flux of the poles of the main magnet 62 on the radially opposite side of the stator 30. This allows for an increase in the output of the motor 1.

[0218] The auxiliary magnet 63 has a generally cylindrical shape with the rotation axis AX as its center. Specifically, the auxiliary magnet 63 has a roughly the same annular shape as the main magnet 62 in axial view, but has a generally cylindrical shape with a relatively small axial dimension.

[0219] The auxiliary magnet 63 is a permanent magnet having magnetic poles (N pole and S pole) with different polarities at its two end faces along the axial direction (an example of a second magnetic pole and a third magnetic pole). For example, as... Figure 31 , Figure 32 As shown, the auxiliary magnet 63 is magnetized in an axial direction orthogonal to the magnetization direction (radial) of the main magnet 62. Additionally, for example, as... Figure 33As shown, the auxiliary magnet 63 can be magnetized within a range where the vector of its magnetization direction has an axial component, specifically in a direction intersecting the magnetization direction (radial) of the main magnet 62 within a range greater than 0 degrees and greater than 90 degrees. Specifically, the auxiliary magnet 63 is axially magnetized in the same way that the magnetic poles of the surface adjacent to the main magnet 62 become the magnetic poles of the surface of the main magnet 62 opposite to the stator 30 (i.e., the radially outer surface). For example, as... Figure 31 , Figure 32 As shown, within the circumferential angular range of the N pole on the surface of the main magnet 62 opposite to the stator 30, the auxiliary magnet 63 is axially magnetized such that its inner side (central side) becomes the N pole and its outer side (end side) becomes the S pole. Figure 30 As shown, the auxiliary magnet 63 is manufactured in such a way that multiple (e.g., two) components with different combinations of polarities of the inner and outer magnetic poles along the axial direction are magnetized at each specified angle, and the multiple components as magnetized permanent magnets are circumferentially combined.

[0220] The short-circuit suppression member 64 (an example of a short-circuit suppression section) is made of a non-magnetic material and is formed of a material with relatively high magnetic reluctance compared to components constituting the magnetic circuit of the rotor 60, such as the main yoke 611. The short-circuit suppression member 64 has a generally cylindrical shape centered on the rotation axis AX, and is arranged adjacent to the main yoke 611 on its axially outer side (end side) and adjacent to the auxiliary magnet 63 on its circumferentially inner side. Specifically, the short-circuit suppression member 64 has a generally annular shape in axial view that is approximately the same as that of the main yoke 611, and a generally cylindrical shape with approximately the same axial dimension as that of the auxiliary magnet 63.

[0221] The protective tube 65 (an example of a short-circuit suppression section) is made of a non-magnetic material and is arranged circumferentially outside the main magnet 62 and the auxiliary magnet 63. As a result, the motor 1 can suppress the detachment of the main magnet 62 and the auxiliary magnet 63 from the rotor 60 caused by the centrifugal force acting with the rotation of the rotor 60.

[0222] The protective tube 65 has a generally cylindrical shape that covers the radially outer sides of the main magnet 62 and the auxiliary magnet 63. For example, as Figure 31 , Figure 33As shown, the protective tube 65 has the same circumferential dimension as the main magnet 62 and the auxiliary magnet 63, and within the range where it can be fastened to the main magnet 62 and the auxiliary magnet 63, it has an inner diameter dimension that is the same as the outer diameter dimension of each of the main magnet 62 and the auxiliary magnet 63, and is generally cylindrical in shape. In this case, the auxiliary yoke 612 has an outer diameter dimension that is approximately the same as the outer diameter dimension of the protective tube 65, and is arranged adjacent to the auxiliary magnet 63, the short-circuit suppression member 64, and the protective tube 65 on the outer side (end side) in the axial direction. In addition, as Figure 32 As shown, the protective tube 65 can have the same axial dimension as the main magnet 62, auxiliary magnet 63, and auxiliary yoke 612 as a whole, and within the range where it can be fastened to the main magnet 62, auxiliary magnet 63, and auxiliary yoke 612, it has an inner diameter dimension that is the same as the outer diameter dimension of each of the main magnet 62, auxiliary magnet 63, and auxiliary yoke 612, and is generally cylindrical in shape. In this case, the protective tube 65 not only covers the main magnet 62 and auxiliary magnet 63, but also covers the radially outer side of the auxiliary yoke 612, and the auxiliary yoke 612 has an outer diameter dimension that is the same as the inner diameter dimension of the protective tube 65 within the range where it can be fastened to the protective tube 65.

[0223] <Methods for suppressing short-circuit magnetic flux of auxiliary magnets>

[0224] Next, refer to Figures 31-32 The method for suppressing the short-circuit magnetic flux of the auxiliary magnet 63 of the electric motor 1 in the seventh embodiment will be described.

[0225] like Figure 31 , Figure 32 As shown, a short-circuit suppression member 64, which has a relatively high magnetic reluctance compared to the main yoke 611 and other components constituting the magnetic circuit of the rotor 60, is disposed adjacent to the radially inner surface of the auxiliary magnet 63. Additionally, a protection tube 65, which also has a relatively high magnetic reluctance compared to the main yoke 611 and other components constituting the magnetic circuit of the rotor 60, is disposed adjacent to the radially outer surface of the auxiliary magnet 63.

[0226] Therefore, in the portion surrounding the auxiliary magnet 63, which faces the imaginary line (extending axially) connecting the pair of magnetic poles inside the auxiliary magnet 63, a state with relatively high magnetic reluctance compared to components constituting the magnetic circuit of the rotor 60, such as the main yoke 611, can be achieved. Thus, short-circuit flux between the pair of magnetic poles of the auxiliary magnet 63 can be suppressed, and the magnetic flux of the poles of the main magnet 62 facing the stator 30 can be further increased. Therefore, the output of the motor 1 can be further increased.

[0227] [Eighth Implementation Method]

[0228] Next, the eighth embodiment will be described.

[0229] The following description focuses on the parts that differ from the seventh embodiment, and sometimes omits the description of content that is the same as or corresponds to the seventh embodiment.

[0230] <Basic Components of an Electric Motor>

[0231] First, refer to Figures 34-40 The basic configuration of the electric motor 1 in the eighth embodiment will be explained.

[0232] Figure 34 , Figure 35 This is a cross-sectional view showing an example of the electric motor 1 according to the eighth embodiment. Specifically, Figure 34 This is a cross-sectional view of the central part of the motor 1 along its axis. Figure 35 This is a cross-sectional view of the axial end of motor 1. Figure 36 This is a perspective view showing an example of the rotor 60 of the eighth embodiment. Figure 37 This is an exploded perspective view showing an example of the rotor 60 according to the eighth embodiment. Figure 36 , Figure 37 The diagram depicts the axial portion of the rotor 60 from the central portion to one end, while the portion from the central portion to the other end is omitted. Figure 38 This is a diagram showing an example of the main magnet 62 of the eighth embodiment. Figure 39 This is a diagram showing an example of the auxiliary magnet 63 of the eighth embodiment. Figure 38 , Figure 39 The solid arrows in the text indicate the magnetization orientation (magnetization direction) of the main magnet 62 and the auxiliary magnet 63, respectively. Figure 40 This is a longitudinal sectional view showing an example of the electric motor 1 according to the eighth embodiment. Specifically, Figure 40 Is with Figure 34 , Figure 35 The sectional view corresponding to the JJ line. Figure 40 The thick solid arrows in the text indicate the flow of magnetic flux between the auxiliary magnet 63 and the main magnet 62, as well as the flow of magnetic flux between the main magnet 62 and the stator 30.

[0233] It should be noted that, in Figure 35 The image shows a cross-sectional view of the motor 1 at the axial position of the rotor 60, which consists only of the stator 30 and the rotor 60. The image depicts the state of the stator 30 as viewed from the axial direction and the cross-section of the rotor 60.

[0234] like Figures 34-40 As shown, the rotor 60 differs from the seventh embodiment in that the rotor core 21 is omitted, and in addition to the main magnet 62, auxiliary magnet 63, short-circuit suppression component 64, and protection tube 65, it also includes an end plate 66.

[0235] The main magnet 62 is disposed in the axial center of the rotor 60, adjacent to the surface of the short-circuit suppression member 64, specifically in the radial outer side of the short-circuit suppression member 64.

[0236] like Figure 38 As shown, the main magnet 62 is constructed as a single component, and unlike the seventh embodiment, it is magnetized with an anisotropic magnetization orientation. Specifically, the main magnet 62 has a pair of magnetic poles (N pole and S pole) with opposite polarities on its radially outer surface (outer peripheral surface) (an example of the first magnetic pole), and has a magnetic circuit structure of a Helbeck array with no leakage flux toward the radially inner side. Therefore, the component constituting the radially inner magnetic circuit of the main magnet 62 (i.e., the main yoke 611 of the seventh embodiment) can be omitted, and this part can be replaced with other components (in this example, the short-circuit suppression component 64).

[0237] The main magnet 62 has multiple sets (two sets in this example) of circumferentially separated pairs of magnetic poles (N pole and S pole) on its radially outer circumferential surface. Specifically, the main magnet 62 has multiple (four in this example) magnetic poles at approximately equal intervals in the circumferential direction, with adjacent magnetic poles having different polarities. Additionally, as... Figure 40 As shown, the main magnet 62 is arranged in a radial manner opposite to the teeth 31B of the stator 30.

[0238] It should be noted that the number of magnetic poles (pole number) arranged on the radial outer circumference of the main magnet 62 only needs to be an even number, and can be more than four.

[0239] The auxiliary magnet 63 is disposed adjacent to the surface of the short-circuit suppression member 64, specifically to the radially outer side of the short-circuit suppression member 64 and adjacent to the axially outer side (end side) of the main magnet 62. Additionally, as... Figure 40 As shown, the auxiliary magnet 63 is arranged in a manner that is not radially opposite to the teeth 31B of the stator 30.

[0240] like Figure 39 As shown, the auxiliary magnet 63 is configured as a single component, and unlike the seventh embodiment, it is magnetized with an anisotropic magnetization orientation. Specifically, the auxiliary magnet 63 has a pair of magnetic poles (N pole and S pole) with different polarities on its axially inner side (central side) adjacent to the main magnet 62 (an example of the second and third magnetic poles), and has a magnetic circuit structure of a Helbeck array that does not have leakage flux to the axially outer side (end side). Therefore, the component constituting the axially outer side (end side) magnetic circuit of the auxiliary magnet 63 (i.e., the auxiliary yoke 612 in the seventh embodiment) can be omitted.

[0241] The auxiliary magnet 63 has multiple sets (two sets in this example) of circumferentially separated pairs of magnetic poles (N pole and S pole) on its inner axial surface. Specifically, the auxiliary magnet 63 has multiple (four in this example) magnetic poles at approximately equal intervals in the circumferential direction, with each pole having a different polarity from its adjacent pole. Furthermore, the auxiliary magnet 63 is arranged adjacent to the main magnet 62 on its outer axial side, such that each N pole and S pole in the circumferential direction is in the same position as the N pole and S pole of the main magnet 62. Thus, the auxiliary magnet 63 can increase (enhance) the magnetic flux of the magnetic poles in the main magnet 62 on the radial surface opposite the stator 30.

[0242] It should be noted that the number of magnetic poles (pole number) on the inner side (central side) of the auxiliary magnet 63 along the axis should be the same as that of the main magnet 62, and can be more than four.

[0243] The short-circuit suppression component 64 has a generally cylindrical shape with the rotation axis AX as its center, and is arranged adjacent to the radially inner side of the main magnet 62 and the auxiliary magnet 63 at the central portion in the axial direction. Specifically, within the range that can be fastened to the main magnet 62 and the auxiliary magnet 63, it has an outer diameter dimension that is the same as the inner diameter dimension of the main magnet 62 and the auxiliary magnet 63, and has a generally cylindrical shape with the same axial dimension as the main magnet 62 and the auxiliary magnet 63 combined.

[0244] End plates 66 are provided at both axial ends of the rotor 60, covering the auxiliary magnet 63 and the short-circuit suppression member 64 from the outer side of the axial direction. Specifically, the end plates 66 have a generally cylindrical shape with a relatively small axial dimension, having an outer diameter shape approximately the same as that of the auxiliary magnet 63 and an insertion hole for the rotation shaft member 50 in the center. The end plates 66 can be made of any material as long as they can perform their function; for example, they can be magnetic or non-magnetic. This prevents the auxiliary magnet 63 and the like from detaching from the axial ends of the rotor 60.

[0245] It should be noted that end plate 66 can be omitted.

[0246] Thus, in the electric motor 1 of the eighth embodiment, a main magnet 62 and an auxiliary magnet 63, magnetized with an anisotropic magnetization orientation, are utilized. This eliminates the need for components forming the radially inner side of the main magnet 62 and the axially outer side of the auxiliary magnet 63's magnetic circuit. Therefore, the freedom of configuration of the electric motor 1 can be increased, enabling, for example, miniaturization and cost reduction of the electric motor 1.

[0247] [Ninth Implementation Method]

[0248] Next, the ninth embodiment will be described.

[0249] The following description focuses on the parts that differ from the seventh embodiment, and sometimes omits the description of content that is the same as or corresponds to the seventh embodiment.

[0250] <Basic Components of an Electric Motor>

[0251] Reference Figures 41-43 The basic structure of the electric motor 1 in the ninth embodiment will be explained.

[0252] Figure 41 , Figure 42 This is a cross-sectional view showing an example of the electric motor 1 according to the ninth embodiment. Specifically, Figure 41 This is a cross-sectional view of the central part of the motor 1 along its axis. Figure 42 This is a cross-sectional view of the axial end of motor 1. Figure 43 This is a longitudinal sectional view of an example of the electric motor 1 according to the ninth embodiment. Specifically, Figure 43 Is with Figure 41 , Figure 42 The cross-sectional view corresponding to the KK line. Figure 43 The thick solid arrow in the figure represents the flow of magnetic flux between magnet 62A and stator 30. Figure 43 The dashed arrow indicates the magnetization orientation (magnetization direction) of magnet 62A.

[0253] It should be noted that, in Figure 42 The image shows a cross-sectional view of the motor 1 at the axial position of the rotor 60, which consists only of the stator 30 and the rotor 60. The image depicts the state of the stator 30 as viewed from the axial direction and the cross-section of the rotor 60.

[0254] like Figures 41-43 As shown, the rotor 60 differs from the seventh embodiment in that it includes a magnet 62A instead of the main magnet 62 and the auxiliary magnet 63.

[0255] Magnet 62A is a single component disposed adjacent to the surfaces of the main yoke 611 and the short-circuit suppression member 64, specifically, on the radially outer sides of the main yoke 611 and the short-circuit suppression member 64. Magnet 62A has a generally cylindrical shape with the rotation axis AX as its center. Specifically, magnet 62A has the same axial dimension as the main yoke 611 and the short-circuit suppression member 64 combined, and has an inner diameter dimension equal to the outer dimensions of the main yoke 611 and the short-circuit suppression member 64 within the range where it can be fastened to the main yoke 611 and the short-circuit suppression member 64.

[0256] The part of magnet 62A that is radially opposite to the tooth 31B corresponds to the part of the main magnet 62 in the seventh and eighth embodiments, while the part that is not radially opposite to the tooth 31B corresponds to the part of the auxiliary magnet 63 in the seventh and eighth embodiments.

[0257] like Figure 43 As shown, magnet 62A has a pair of magnetic poles (N pole and S pole) with different polarities at any circumferential angular position of rotor 60, on its axial end face and radially outward end face (an example of a second magnetic pole and a first magnetic pole, or a third magnetic pole and a first magnetic pole). Furthermore, for magnet 62A, at any circumferential angular position of rotor 60, the magnetic poles on its axial end face and radial end face are magnetized in a radially inwardly convex curve-shaped magnetization orientation. Specifically, the magnetization orientation of the portion of magnet 62A corresponding to auxiliary magnet 63 is different from the magnetization orientation of the portion corresponding to main magnet 62. Magnet 62A has a pair of magnetic poles with different polarities at the boundary surface between the portion corresponding to main magnet 62 and the portion corresponding to auxiliary magnet 63. Specifically, the portion of magnet 62A at the boundary surface corresponding to auxiliary magnet 63 has a magnetic pole with a polarity different from the magnetic poles on the axial end face of magnet 62A (an example of a third magnetic pole or a second magnetic pole). Furthermore, the portion of magnet 62A at the boundary surface corresponding to the main magnet 62 has a magnetic pole with a polarity different from the magnetic poles of the radial end face of magnet 62A (an example of a fourth magnetic pole). Moreover, magnet 62A is integrally formed such that the magnetic pole at the axially inner end of the portion corresponding to the auxiliary magnet 63 is axially opposite to the magnetic pole at the axially outer end of the portion corresponding to the main magnet 62. Thus, magnet 62A has a magnetic circuit structure of a Helbeck array with no leakage flux on the radially inner side. Therefore, the magnetic flux of the magnetic poles of magnet 62A on the radially opposite surface to stator 30 can be increased (strengthened).

[0258] It should be noted that magnet 62A is magnetized by switching the polarity of a pair of magnetic poles on its axial end face and radially outer end face at each predetermined angle in the circumferential direction of rotor 60. Specifically, on the axial end face of magnet 62A, the N pole and S pole are alternately arranged at each predetermined angle in the circumferential direction; on the radially outer end face of magnet 62A, the N pole and S pole are alternately arranged with polarities different from those on the axial end face within the same angular range at each predetermined angle.

[0259] Thus, in this example, magnet 62A is magnetized such that the axial component of the magnetization direction (magnetization orientation) changes from a state where the axial component is relatively large to a state where the radial component is relatively large, moving from the axial end face to the radially outward end face. Therefore, magnet 62A can achieve the functions of both the main magnet 62 and the auxiliary magnet 63 of the seventh embodiment with a single component.

[0260] [Other Implementation Methods]

[0261] Next, other implementation methods will be described.

[0262] The first to ninth embodiments described above can be appropriately combined.

[0263] For example, in the third embodiment, short-circuit suppression components 25 and 26 can be omitted, and the same as in the case of spaces 25B and 26B in the second embodiment, can be replaced with spaces where no components exist (an example of short-circuit suppression components and spaces where no components exist).

[0264] Alternatively, for example, in the fourth embodiment, the short-circuit suppression component 28 can be omitted, and the gaps 25A and 26A in the second embodiment can be replaced by a gap achieved by the recess of the back magnetic yoke 211 (an example of a space where the short-circuit suppression component does not exist).

[0265] Additionally, for example, in the fifth embodiment, the short-circuit suppression component 44 can be omitted, and the space 25B and 26B in the second embodiment can be replaced with a space where no component exists (an example of a short-circuit suppression component or a space where no component exists).

[0266] Alternatively, for example, in the fifth embodiment, the short-circuit suppression component 44 can be omitted, and the main yoke 411 extends axially to the auxiliary magnet 43 and the auxiliary yoke 412. Furthermore, similar to the gaps 25A and 26A in the second embodiment, a gap can be provided around the auxiliary magnet 43, which faces the imaginary lines connecting a pair of magnetic poles inside the auxiliary magnet 43, by providing a recess on the surface of the main yoke 411 adjacent to the auxiliary magnet 43. (An example of a space without a short-circuit suppression component).

[0267] Alternatively, for example, in the sixth embodiment, the short-circuit suppression components 47 and 48 can be omitted, and the gaps 25A and 26A in the second embodiment can be replaced by a gap achieved by the cavity of the auxiliary magnet slot of the rotor core 41 (an example of a space without short-circuit suppression components).

[0268] Additionally, for example, in the first and second embodiments, the auxiliary magnets 23 and 24 are similar to the auxiliary magnet 63 in the seventh embodiment. Figure 33 The same applies to the case where the magnetization direction of the main magnet 22 is intersected at an angle greater than 0 degrees and less than 90 degrees.

[0269] Additionally, for example, in the fourth embodiment, the auxiliary magnet 27 can be used with the auxiliary magnet 63 of the seventh embodiment. Figure 33The same applies to the case where the magnetization direction of the main magnet 22 is intersected at an angle greater than 0 degrees and less than 90 degrees.

[0270] Additionally, for example, in the fifth embodiment, the auxiliary magnet 43 can be used with the auxiliary magnet 63 of the seventh embodiment. Figure 33 The same applies to the case where the magnetization direction of the main magnet 42 is intersected at an angle greater than 0 degrees and less than 90 degrees.

[0271] Additionally, for example, in the first to third embodiments, the main magnet 22 may be magnetized in an anisotropic magnetization orientation on the surface opposite to the stator 10 in the axial direction, with multiple sets of pairs of magnetic poles of different polarities arranged in the circumferential direction.

[0272] Alternatively, for example, in the first and second embodiments, the main magnet 22 and the auxiliary magnets 23 and 24 can be replaced with a single magnet component having a pair of magnetic poles on the radial end face and the axial end face opposite to the stator 10, similar to the case of magnet 62A in the ninth embodiment.

[0273] Alternatively, for example, in the fifth embodiment, the main magnet 42 and the auxiliary magnet 43 can be replaced with a single magnet component having a pair of magnetic poles on the axial end face and the radially outer end face opposite to the stator 30, similar to the case of magnet 62A in the ninth embodiment.

[0274] Alternatively, for example, in the sixth embodiment, the main magnet 42 and the auxiliary magnet 46 can be replaced with a magnet component having a pair of magnetic poles on the end face in the long side direction of the axial view and on the end face in the short side direction opposite to the stator 30, just like the magnet 62A in the ninth embodiment.

[0275] In addition, appropriate modifications and alterations can be made to the first to ninth embodiments described above.

[0276] For example, in the first to third embodiments, the auxiliary magnets 23 and the auxiliary magnets 24 arranged radially on the outer side of the auxiliary magnets 24 can be omitted. In this case, the outer ring portion 213 is also omitted. In addition, in this case, in the first embodiment, the short-circuit suppression member 26 is also omitted, while in the second embodiment, the radial dimension of the back magnetic yoke portion 211 is shortened along with the omission of the auxiliary magnets 24 and the outer ring portion 213. As a result, the increase in the radial dimension of the motor 1 can be suppressed. Therefore, the enlargement of the motor 1 can be suppressed, and the output of the motor 1 can be improved.

[0277] Furthermore, for example, in the first to third embodiments, the plurality of auxiliary magnets 23 and the plurality of auxiliary magnets 24 disposed radially inside the main magnet 23 can be omitted. In this case, the inner ring portion 212 is also omitted. In addition, in this case, in the first embodiment, the short-circuit suppression member 25 is also omitted, and in the second embodiment, the radial dimension of the back magnetic yoke portion 211 is shortened along with the omission of the plurality of auxiliary magnets 23 and the inner ring portion 212. As a result, sufficient space can be ensured for the bearing and the rotating shaft member (drive shaft) disposed radially inside the main magnet 22. Therefore, space can be ensured for the components disposed radially inside the main magnet 22, and the output of the motor 1 can be improved.

[0278] Furthermore, for example, in the fifth embodiment, the auxiliary magnet 43 at either end of the auxiliary magnet 43 disposed at both ends of the axial direction can be omitted. In this case, at the end where the auxiliary magnet 43 is omitted, the auxiliary yoke 412 and the short-circuit suppression member 44 are also omitted. As a result, the increase in the axial dimension of the motor 1 can be suppressed. Therefore, the enlargement of the axial dimension of the motor 1 can be suppressed, and the output of the motor 1 can be improved.

[0279] Alternatively, for example, in the sixth embodiment, the auxiliary magnet 46 at either end of the two auxiliary magnets 46 arranged adjacent to each other at both ends of the main magnet 42 in a direction orthogonal to the main magnetic flux can be omitted. In this case, the short-circuit suppression components 47 and 48 are also omitted at the end where the auxiliary magnet 46 is omitted.

[0280] Alternatively, for example, in the eighth embodiment, only the main magnet 42 and the auxiliary magnet 43 may be magnetized with an anisotropic magnetization orientation, and the auxiliary magnet 43 may be magnetized in the same manner as in the seventh embodiment. In this case, instead of the end plate 66, the auxiliary yoke 612 is provided, as in the seventh embodiment.

[0281] [Examples of electric motor applications]

[0282] Next, refer to Figure 44 A specific application example of the electric motor 1 in this embodiment will be described.

[0283] Figure 44 This is a diagram showing an example of an air conditioner 100 equipped with the electric motor 1 of this embodiment.

[0284] Air conditioner 100 (an example of a refrigeration unit) includes an outdoor unit 110, an indoor unit 120, and refrigerant paths 130 and 140. Air conditioner 100 activates the refrigerant circuit consisting of outdoor unit 110, indoor unit 120, and refrigerant paths 130 and 140, thereby adjusting the indoor temperature, humidity, etc. set in indoor unit 120.

[0285] The outdoor unit 110 is installed outdoors in a building where temperature and other conditions are to be regulated. The outdoor unit 110 is connected to one end of each of the refrigerant paths 130 and 140, and draws in refrigerant from either of the refrigerant paths 130 and 140 and discharges refrigerant to the other.

[0286] Indoor unit 120 is installed inside the building where temperature and other conditions are to be regulated. Indoor unit 120 is connected to the other end of each of refrigerant paths 130 and 140, and draws in refrigerant from either refrigerant path 130 or 140 and discharges refrigerant to the other.

[0287] The refrigerant paths 130 and 140 are, for example, formed by pipes that connect the outdoor unit 110 and the indoor unit 120 in a manner that allows the refrigerant to circulate between the outdoor unit 110 and the indoor unit 120.

[0288] The outdoor unit 110 includes refrigerant paths L1 to L6, a four-way switching valve 111, a compressor 112, an outdoor heat exchanger 113, an outdoor expansion valve 114, and a fan 115.

[0289] The refrigerant paths L1 to L6 are, for example, formed by piping.

[0290] The refrigerant path L1 connects one end of the external refrigerant path 130 of the outdoor unit 110 to the four-way switching valve 111.

[0291] The refrigerant path L2 connects the four-way switching valve 111 and the inlet of the compressor 112.

[0292] The refrigerant path L3 connects the four-way switching valve 111 and the outlet of the compressor 112.

[0293] The refrigerant path L4 connects the four-way switching valve 111 and the outdoor heat exchanger 113.

[0294] The refrigerant path L5 connects the outdoor heat exchanger 113 and the outdoor expansion valve 114.

[0295] The refrigerant path L6 connects one end of the external refrigerant path 140 of the outdoor unit 110 to the outdoor expansion valve 114.

[0296] The four-way switching valve 111 reverses the flow of refrigerant circulation when the air conditioner 100 is operating in cooling or heating mode.

[0297] When the air conditioner 100 is operating in cooling mode, the four-way switching valve 111 will... Figure 44 The solid lines in the diagram connect the paths. Specifically, when the air conditioner 100 is operating in cooling mode, the four-way switching valve 111 connects the refrigerant paths L1 and L2, and the refrigerant paths L3 and L4.

[0298] On the other hand, when the air conditioner 100 is operating in heating mode, the four-way switching valve 111 will... Figure 44 The path connection of the points and lines in the diagram. Specifically, when the air conditioner 100 is in heating operation, the four-way switching valve 111 connects the refrigerant path L4 and refrigerant path L2, as well as the refrigerant path L1 and refrigerant path L3.

[0299] The compressor 112 draws in refrigerant through the refrigerant path L2, compresses it to high pressure, and sprays it out into the refrigerant path L3. The compressor 112 is equipped with (built into) an electric motor 1 and is electrically driven by the electric motor 1.

[0300] When the air conditioner 100 is operating in cooling mode, the high-temperature and high-pressure refrigerant compressed by the compressor 112 flows into the outdoor heat exchanger 113 through the refrigerant path L3 and the refrigerant path L4.

[0301] On the other hand, when the air conditioner 100 is operating in heating mode, the high-temperature and high-pressure refrigerant compressed by the compressor 112 flows out through refrigerant path L3 and refrigerant path L1 to the refrigerant path 130 outside the outdoor unit 110. Furthermore, the high-temperature and high-pressure refrigerant flows into the indoor unit 120 through refrigerant path 130.

[0302] The outdoor heat exchanger 113 performs heat exchange between external gas and refrigerant flowing through it. Specifically, a fan 115 is provided in the outdoor heat exchanger 113, and the outdoor heat exchanger 113 performs heat exchange between external gas circulated by the fan 115 and refrigerant flowing inside it.

[0303] When the air conditioner 100 is operating in cooling mode, the outdoor heat exchanger 113 causes the high-temperature and high-pressure refrigerant that flows in from the refrigerant path L4 and is compressed by the compressor 112 to release heat to the outside gas, so that the condensed / liquefied refrigerant (liquid refrigerant) flows out to the refrigerant path L5.

[0304] In addition, when the air conditioner 100 is in heating mode, the outdoor heat exchanger 113 causes the low-temperature, low-pressure liquid refrigerant flowing in from the refrigerant path L5 to absorb heat from the external gas, and causes the evaporated refrigerant to flow out to the refrigerant path L4.

[0305] When the air conditioner 100 is in heating mode, the outdoor expansion valve 114 is closed to a predetermined opening, which reduces the pressure of the refrigerant (liquid refrigerant) flowing in from the refrigerant path L6 to a predetermined pressure. On the other hand, when the air conditioner 100 is in cooling mode, the outdoor expansion valve 114 is set to a fully open state, allowing the refrigerant (liquid refrigerant) to pass from the refrigerant path L5 to the refrigerant path L6.

[0306] As described above, fan 115 (an example of a blower) blows air onto outdoor heat exchanger 113, promoting heat exchange within outdoor heat exchanger 113. Fan 115 is equipped with motor 1 and is electrically driven by motor 1.

[0307] The indoor unit 120 includes an indoor expansion valve 121, an indoor heat exchanger 122, and a fan 123.

[0308] When the air conditioner 100 is in cooling mode, the indoor expansion valve 121 is closed to a predetermined opening, reducing the pressure of the subcooled liquid refrigerant flowing in from the refrigerant path 140 to a predetermined pressure. On the other hand, when the air conditioner 100 is in heating mode, the indoor expansion valve 121 is set to a fully open state, allowing the refrigerant (liquid refrigerant) flowing out from the indoor heat exchanger 122 to pass through the refrigerant path 140.

[0309] The indoor heat exchanger 122 performs heat exchange between indoor air and the refrigerant passing through it. Specifically, under the action of the fan 123 mounted on the indoor unit 120, indoor air is forced to pass around the indoor heat exchanger 122, and the indoor air that has exchanged heat with the refrigerant inside the indoor heat exchanger 122 is blown out to the outside of the indoor unit 120 to achieve indoor cooling or heating.

[0310] Specifically, when the air conditioner 100 is operating in cooling mode, the indoor heat exchanger 122 causes the low-temperature, low-pressure liquid refrigerant, which is depressurized by the indoor expansion valve 121, to absorb heat from the indoor air, thereby lowering the temperature of the indoor air.

[0311] On the other hand, when the air conditioner 100 is in heating mode, the indoor heat exchanger 122 causes the high-temperature and high-pressure refrigerant flowing from the outdoor unit 110 through the refrigerant path 130 to release heat to the indoor air, thereby raising the temperature of the indoor air.

[0312] As described above, fan 123 (an example of a blower) blows air into indoor heat exchanger 122, causing indoor air that has exchanged heat with the refrigerant inside indoor heat exchanger 122 to be blown out to the outside of indoor unit 120. Fan 123 is equipped with motor 1 and is electrically driven by motor 1.

[0313] It should be noted that the motor 1 can be mounted on one or both of the compressor 112, fan 115, and fan 123.

[0314] Thus, in this example, the motor 1 described in this embodiment is installed in the compressor 112, fan 115, and fan 123 of the air conditioner 100. Therefore, by using a motor 1 with a relatively large output, the power required to obtain the same output is relatively reduced, thereby improving the energy efficiency of the compressor 112, fan 115, and fan 123. As a result, the energy efficiency of the air conditioner 100 is improved.

[0315] [effect]

[0316] Next, the function of the electric motor 1 in this embodiment will be explained.

[0317] In this embodiment, the electric motor 1 includes: a stator; a rotor opposite to the stator in a first direction and configured to rotate freely in a second direction orthogonal to the first direction; and a short-circuit suppression section. The stator may be, for example, stator 10 or stator 30. The rotor may be, for example, rotor 20, rotor 40, or rotor 60. The short-circuit suppression section may be, for example, short-circuit suppression components 25 and 26, gaps 25A and 26A, spaces 25B and 26B, short-circuit suppression component 44, short-circuit suppression components 47 and 48, and short-circuit suppression component 64, etc. Specifically, the rotor has: a first magnet having a first magnetic pole on a surface opposite to the stator; and a second magnet disposed adjacent to the first magnet, having a second magnetic pole and a third magnetic pole with a polarity different from the second magnetic pole, and increasing the magnetic flux of the first magnetic pole. Furthermore, the second magnet is disposed adjacent to the first magnet in a third direction orthogonal to the first direction. The first magnet may be, for example, main magnet 22, main magnet 42, or main magnet 62, etc. The second magnet may be, for example, auxiliary magnets 23, 24, 27, 43, 46, and 63. Furthermore, a short-circuit suppression section is provided around the second magnet, which faces the imaginary line connecting the second and third magnetic poles, to suppress short circuits in the magnetic flux between the second and third magnetic poles.

[0318] Therefore, it is difficult to generate a magnetic flux that would short-circuit the poles of the second magnet by means of an imaginary line parallel to the poles of the second magnet. Thus, it is possible to further increase the magnetic flux of the poles of the first magnet opposite to the stator.

[0319] Furthermore, in this embodiment (first to third embodiments), the third direction can be orthogonal to the second direction. Specifically, the rotor 20 and the stator 10 can be arranged opposite each other in the axial direction. In addition, the main magnet 22 can be arranged with a plurality of first magnetic poles arranged circumferentially around the rotation axis AX. Furthermore, the auxiliary magnets 23 and 24 can be arranged with the second or third magnetic poles adjacent to each other in the radial direction (third direction) of the plurality of first magnetic poles.

[0320] Furthermore, in this embodiment (fourth embodiment), the third direction can be the same as the second direction. Specifically, the rotor 20 and the stator 10 can be arranged axially opposite each other. In addition, the main magnet 22 can be arranged with a plurality of first magnetic poles arranged circumferentially around the rotation axis AX. Furthermore, the auxiliary magnet 27 can be arranged with a second magnetic pole or a third magnetic pole adjacent to each of the plurality of first magnetic poles in their respective circumferential directions (third direction).

[0321] Therefore, in the axial gap type motor 1, specifically, auxiliary magnets 23, 24, and 27 can be used to further increase the magnetic flux of the poles of the main magnet 22 opposite to the stator 30. Thus, the output of the axial gap type motor 1 can be further improved.

[0322] Furthermore, in this embodiment (the fifth embodiment and the seventh embodiment), the third direction can be orthogonal to the second direction. Specifically, the rotor 40 and the stator 30 can be arranged radially opposite each other. Additionally, the main magnet 42 can be arranged with a plurality of first magnetic poles circumferentially arranged around the rotation axis AX. Furthermore, the auxiliary magnet 43 can be arranged with a second or third magnetic pole adjacent to each of the plurality of first magnetic poles along their respective axial directions (third direction). Similarly, the rotor 60 and the stator 30 can be arranged radially opposite each other. Additionally, the main magnet 62 can be arranged with a plurality of first magnetic poles circumferentially arranged around the rotation axis AX. Furthermore, the auxiliary magnet 63 can be arranged with a second or third magnetic pole adjacent to each of the plurality of first magnetic poles along their respective axial directions (third direction).

[0323] Furthermore, in this embodiment (sixth embodiment), the third direction can be the same as the second direction. Specifically, the rotor 40 and the stator 30 can be arranged radially opposite each other. Additionally, the main magnet 42 can be arranged with a plurality of first magnetic poles arranged circumferentially around the rotation axis AX. Furthermore, the auxiliary magnet 46 can be arranged such that, when viewed from the axial direction, the second or third magnetic pole is adjacent to the ends of the plurality of first magnetic poles in a direction orthogonal to their respective main magnetic flux (the third direction).

[0324] Therefore, in the radial gap type motor 1, specifically, auxiliary magnets 43 and 46 can be used to further increase the magnetic flux of the poles of the main magnet 42 opposite to the stator 30. Thus, the output of the radial gap type motor 1 can be further improved.

[0325] Furthermore, in this embodiment (first embodiment to seventh embodiment, ninth embodiment), the first magnet may have a fourth magnetic pole on a surface different from the surface having the first magnetic pole. Additionally, the rotor may include a first component that forms the magnetic circuit between the plurality of first magnets and the plurality of fourth magnetic poles. The first component may be, for example, a back yoke 211, a main yoke 411, or a main yoke 611. Furthermore, the magnetic reluctance of the short-circuit suppression section may be higher than that of the first component.

[0326] Therefore, the short-circuit suppression section can specifically suppress the short-circuit flux of the second magnet.

[0327] In addition, in this embodiment (first embodiment, third embodiment to ninth embodiment), a non-magnetic body may be provided in the short-circuit suppression section.

[0328] Therefore, by using a component made of a non-magnetic material with relatively high magnetic reluctance, specifically, it is possible to suppress the magnetic flux that would short-circuit the poles of the auxiliary magnet.

[0329] Furthermore, in this embodiment (second embodiment), a space where no component is present can be provided in the short-circuit suppression section.

[0330] Therefore, by utilizing the space of the non-existent component with relatively high magnetic reluctance, specifically, it is possible to suppress the magnetic flux that would short-circuit the magnetic poles of the auxiliary magnet.

[0331] Furthermore, in this embodiment (first embodiment to ninth embodiment), the second magnet can be magnetized in a direction perpendicular to the magnetization direction of the first magnet.

[0332] Thus, a Hellbeck array can be realized between the first magnet and the second magnet, specifically, the magnetic flux of the first magnet's pole opposite to the stator can be increased.

[0333] In addition, in this embodiment, the second magnet can be magnetized in a direction that intersects the magnetization direction of the first magnet at an angle greater than 0 degrees and less than 90 degrees.

[0334] Thus, a Hellbeck array can be realized between the first magnet and the second magnet, specifically, the magnetic flux of the first magnet's pole opposite to the stator can be increased.

[0335] In addition, in this embodiment, at least one of the first magnet and the second magnet can be magnetized in an anisotropic magnetization orientation.

[0336] Therefore, it is unnecessary to include components of magnetic bodies that form the magnetic circuits between the first magnets and between the second magnets. As a result, the freedom of configuration of the electric motor 1 can be increased, for example, the electric motor 1 can be miniaturized and its cost reduced.

[0337] In addition, in this embodiment (ninth embodiment), the first magnet and the second magnet may be composed of an integral magnet 62A.

[0338] Therefore, the functions of the first magnet and the second magnet can be achieved through a single component.

[0339] In addition, in this embodiment, the compressor 112 may be equipped with an electric motor 1.

[0340] As a result, compressor 112 can improve energy efficiency.

[0341] In addition, in this embodiment, the fan 115 and the fan 123 may be equipped with an electric motor 1.

[0342] Therefore, fans 115 and 123 can improve energy efficiency.

[0343] In addition, in this embodiment, the air conditioner 100 may include a compressor 112 and fans 115 and 123. Furthermore, at least one of the compressor 112 and fans 115 and 123 may be equipped with an electric motor 1.

[0344] Therefore, air conditioner 100 can improve energy efficiency.

[0345] [Transformation / Change]

[0346] While the embodiments have been described above, it is understood that various changes in manner and details are possible without departing from the spirit and scope of the claims.

[0347] For example, in the fifth to ninth embodiments described above, although a method for suppressing short-circuit flux between a pair of poles of a second magnet (auxiliary magnets 43, 46, 63) is disclosed for an internal rotor type motor 1, which increases the magnetic flux of the poles of the first magnet (main magnets 42, 62) on the surface opposite to the stator 30, the same method can also be used in the rotor of an external rotor type motor.

[0348] Finally, this application claims priority based on Japanese Patent Application No. 2020-100025, filed on June 9, 2020, the entire contents of which are incorporated herein by reference.

[0349] Explanation of reference numerals in the attached figures

[0350] 1. Electric motor

[0351] 10 stators

[0352] 11 Stator Core

[0353] 11A Back Magnetic Yoke

[0354] 11B Tooth

[0355] 12 windings

[0356] 20 rotors

[0357] 21 Rotor core

[0358] 22. Main magnet (first magnet)

[0359] 23, 24 Auxiliary magnets (second magnets)

[0360] 25, 26 Short-circuit suppression components (short-circuit suppression parts)

[0361] 25A, 26A Gaps (space where no component exists)

[0362] Spaces 25B and 26B (spaces where no components exist)

[0363] 27. Auxiliary magnet (second magnet)

[0364] 28. Short-circuit suppression component (short-circuit suppression section)

[0365] 30 stators

[0366] 31 Stator Core

[0367] 31A Back Magnetic Yoke

[0368] 31B Tooth

[0369] 32 windings

[0370] 40 rotors

[0371] 41 Rotor core

[0372] 42. Main magnet (first magnet)

[0373] 43. Auxiliary magnet (second magnet)

[0374] 44. Short-circuit suppression component (short-circuit suppression section)

[0375] 46. ​​Auxiliary magnet (second magnet)

[0376] 47, 48 Short-circuit suppression components (short-circuit suppression parts)

[0377] 50 Rotary shaft components

[0378] 60 rotor

[0379] 61 Rotor core

[0380] 62. Main magnet (first magnet)

[0381] 63. Auxiliary magnet (second magnet)

[0382] 64. Short-circuit suppression component (short-circuit suppression section)

[0383] 65 Protective tube

[0384] 66 end plate

[0385] 211 Back Magnetic Yoke (First Component)

[0386] 212 Inner Ring Road

[0387] 213 Outer Ring Road

[0388] 411 Main yoke (first component)

[0389] 412 Auxiliary yoke section

[0390] 611 Main yoke (first component)

[0391] 612 Auxiliary yoke section

[0392] AX Rotation Axis

Claims

1. An electric motor, comprising: stator; The rotor is configured to be opposite to the stator in a first direction and to rotate freely in a second direction orthogonal to the first direction; and Short circuit suppression section, The rotor mentioned above includes: A plurality of first magnets, each having a first magnetic pole on a surface opposite to the stator, and a fourth magnetic pole on a surface opposite to the surface having the first magnetic pole in the first direction; A first component, which is disposed adjacent to the surface of the first magnet having the fourth magnetic pole in the first direction, constitutes a magnetic circuit between the fourth magnetic poles of the plurality of first magnets; and The second magnet, arranged adjacent to the first magnet, has a second magnetic pole and a third magnetic pole with a polarity different from the second magnetic pole, and increases the magnetic flux of the first magnetic pole. The second magnet is arranged adjacent to the first magnet in a third direction orthogonal to the first direction. The aforementioned short-circuit suppression section is located around the second magnet, which faces the imaginary line connecting the second and third magnetic poles, thereby suppressing short circuits in the magnetic flux between the second and third magnetic poles. The magnetic reluctance of the short-circuit suppression section is higher than that of the first component. A portion of the first component is at least partially surrounded by the short-circuit suppression portion.

2. The electric motor according to claim 1, wherein, The aforementioned third direction is orthogonal to the aforementioned second direction.

3. The electric motor according to claim 1 or 2, wherein, The rotor and stator described above are arranged axially opposite each other. The plurality of the aforementioned first magnets are arranged circumferentially with the aforementioned first magnetic poles as the center of the rotation axis. The second magnet is arranged such that the second magnetic pole or the third magnetic pole is radially adjacent to each of the plurality of first magnetic poles.

4. The electric motor according to claim 1 or 2, wherein, The rotor and stator described above are arranged radially opposite each other. The plurality of the aforementioned first magnets are arranged circumferentially with the aforementioned first magnetic poles as the center of the rotation axis. The second magnet is arranged such that the second magnetic pole or the third magnetic pole is axially adjacent to each of the plurality of first magnetic poles.

5. The electric motor according to claim 1, wherein, The aforementioned third direction is the same as the aforementioned second direction.

6. The electric motor according to claim 1 or 5, wherein, The rotor and stator described above are arranged axially opposite each other. The plurality of the aforementioned first magnets are arranged circumferentially with the aforementioned first magnetic poles as the center of the rotation axis. The second magnet is arranged such that the second magnetic pole or the third magnetic pole is circumferentially adjacent to each of the plurality of first magnetic poles.

7. The electric motor according to claim 1 or 5, wherein, The rotor and stator described above are arranged radially opposite each other. The plurality of the aforementioned first magnets are arranged circumferentially with the aforementioned first magnetic poles as the center of the rotation axis. The second magnet is arranged such that, when viewed from the axial direction, the second magnetic pole or the third magnetic pole is adjacent to the ends of the plurality of first magnetic poles in the respective directions orthogonal to the main magnetic flux.

8. The electric motor according to any one of claims 1, 2, and 5, wherein, A non-magnetic material is provided in the aforementioned short-circuit suppression section.

9. The electric motor according to any one of claims 1, 2, and 5, wherein, The space where no components are provided is provided in the aforementioned short-circuit suppression section.

10. The electric motor according to any one of claims 1, 2, and 5, wherein, The second magnet is magnetized in a direction perpendicular to the magnetization direction of the first magnet.

11. The electric motor according to any one of claims 1, 2, and 5, wherein, The second magnet is magnetized in a direction that intersects the magnetization direction of the first magnet at an angle greater than 0 degrees and less than 90 degrees.

12. The electric motor according to any one of claims 1, 2, and 5, wherein, At least one of the first magnet and the second magnet is magnetized with an anisotropic magnetization orientation.

13. The electric motor according to any one of claims 1, 2, and 5, wherein, The first magnet and the second magnet mentioned above are integrally formed.

14. A compressor equipped with an electric motor according to any one of claims 1 to 13.

15. A blower equipped with an electric motor according to any one of claims 1 to 13.

16. A refrigeration apparatus comprising a compressor and a blower, At least one of the compressor and the blower is equipped with an electric motor as described in any one of claims 1 to 13.

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