Motor magnet, field element, and motor

Abstract

A motor magnet (710) is provided in either a stator or a rotor which are arranged in the radial direction. The motor magnet has an orientation (OR). The motor magnet has: a first region (610) provided with a radial orientation component along the radial direction and a circumferential orientation component along the circumferential direction; and a fourth region (640) provided with a radial orientation component oriented in the opposite direction to that in the first region and a circumferential orientation component. The motor magnet has a second region (620) and a third region (630) that connect the first region and the fourth region to each other and are provided with a circumferential orientation component oriented in the same direction as that in the first region. In the first region and the fourth region, the absolute value of a value obtained by dividing the radial orientation component by the circumferential orientation component increases as the distance from the second region and the third region increases. The magnitudes of the radial orientation components of the second region and the third region are zero.

Description

Motor magnet, field magnet, and motor Cross-reference to related applications

[0001] This application is based on Japanese Patent Application No. 2024-195462 filed in Japan on November 7, 2024, and the contents of the basic application are hereby incorporated by reference in their entirety.

[0002] The disclosure in this specification relates to a motor magnet, a field magnet, and a motor.

[0003] Patent Document 1 describes a permanent magnet motor. This permanent magnet motor includes a rotor in which the orientation of the magnetization easy axis is aligned in a polar anisotropic manner.

[0004] Japanese Unexamined Patent Application Publication No. 2011-217517

[0005] As described above, when the orientation is polar anisotropic, if the thickness of the rotor is small, there is a risk that the magnetic flux emitted from the rotor affects the periphery.

[0006] One object of the present disclosure is to provide a motor magnet, a field magnet, and a motor in which the influence of the magnetic flux emitted from the motor magnet is suppressed.

[0007] A motor magnet in a disclosed embodiment is provided on a field magnet that is aligned with an exciter in a first direction, and is oriented, wherein the orientation includes a first orientation component along the first direction and a second orientation component that intersects the first direction and is oriented along a second direction in which either the exciter or the field magnet moves, and comprises a first magnet portion having the first orientation component and the second orientation component, a second magnet portion having a first orientation component opposite to that of the first magnet portion in the first direction and a second orientation component having the same orientation as that of the first magnet portion in the second direction, and a connecting portion interposed between the first magnet portion and the second magnet portion in the second direction, connecting the first magnet portion and the second magnet portion, and having a second orientation component having the same orientation as that of the first magnet portion in the second direction, wherein in the first magnet portion, the absolute value of the first orientation component divided by the second orientation component increases as it moves away from the connecting portion in the second direction, In the second magnet section, as the distance from the connecting section increases in the second direction, the absolute value of the first orientation component divided by the second orientation component increases, and the magnitude of the first orientation component of the connecting section becomes zero.

[0008] A field in a disclosed embodiment is a field aligned with an exciter in a first direction, and comprises an oriented extension magnet that intersects the first direction and extends in a second direction in which one of the exciter and the field moves, wherein the orientation includes a first orientation component along the first direction and a second orientation component along the second direction, and the extension magnet comprises a first magnet portion having the first orientation component and the second orientation component, a second magnet portion having a first orientation component opposite to that of the first magnet portion in the first direction and a second orientation component having the same orientation as that of the first magnet portion in the second direction, and a connecting portion interposed between the first magnet portion and the second magnet portion in the second direction, connecting the first magnet portion and the second magnet portion, and having a second orientation component having the same orientation as that of the first magnet portion in the second direction, wherein in the first magnet portion, the absolute value of the first orientation component divided by the second orientation component increases as it moves away from the connecting portion in the second direction, In the second magnet section, as the distance from the connecting section increases in the second direction, the absolute value of the first orientation component divided by the second orientation component increases, and the magnitude of the first orientation component of the connecting section becomes zero.

[0009] A motor in a disclosed embodiment comprises an exciter and a field element aligned in a first direction, the field element having an oriented extension magnet that intersects the first direction and extends in a second direction in which one of the exciter and the field element moves, the oriented component comprising a first oriented component along the first direction and a second oriented component along the second direction, the extension magnet comprising a first magnet portion having the first and second oriented components, a second magnet portion having a first oriented component opposite to that of the first magnet portion in the first direction and a second oriented component having the same orientation as that of the first magnet portion in the second direction, and a connecting portion interposed between the first and second magnet portions in the second direction, connecting the first and second magnet portions, and having a second oriented component having the same orientation as that of the first magnet portion in the second direction, wherein in the first magnet portion, the absolute value of the first oriented component divided by the second oriented component increases as it moves away from the connecting portion in the second direction, In the second magnet section, as the distance from the connecting section increases in the second direction, the absolute value of the first orientation component divided by the second orientation component increases, and the magnitude of the first orientation component of the connecting section becomes zero.

[0010] According to this, a magnetic path is more easily formed within the motor magnet. This suppresses the influence of the magnetic flux emitted from the motor magnet on the surrounding area.

[0011] The reference numbers in parentheses above merely indicate the correspondence with the configurations described in the embodiments below, and do not limit the technical scope in any way.

[0012] This is a top view of the motor. This is a perspective view of the rotor. This is a schematic diagram showing three-dimensional polar coordinates. This is a top view to explain the orientation of the magnets. This is a top view of the magnets shown in Figure 4 converted to a linear shape. This is a top view to explain the orientation of the magnets. This is a top view to explain the orientation of the magnets. This is a top view to explain the orientation of the magnets. This is a top view of the motor. This is a top view of the motor. This is a cross-sectional view along the line XIII-XIII in Figure 12. This is a top view of the motor. This is a perspective view of the rotor and stator. This is a top view of the motor. This is a cross-sectional view of the motor. This is a perspective view to explain the orientation of the magnets. This is a cross-sectional view of the motor.

[0013] The following describes several embodiments for implementing this disclosure with reference to the drawings. In later embodiments, parts corresponding to matters described in earlier embodiments may be given the same reference numerals, and redundant explanations may be omitted. If only a part of the configuration is described in each embodiment, the description of the earlier embodiment may be applied to the other parts of the configuration.

[0014] It is possible to combine parts that are explicitly shown to be combinable in each form. Furthermore, if there are no particular problems with the combination, it is also possible to partially combine multiple forms with each other, a form with a modified form, and multiple modified forms with each other, even if it is not explicitly shown that they can be combined.

[0015] <First Embodiment> <Motor> The motor 100 shown in Figure 1 has a magnet 600. This motor 100 can be applied to consumer, commercial, industrial, and medical products. The motor 100 can be applied to mobility products that move people or objects, robotic products involved in the production and control of goods, and equipment that generates energy such as electricity. In addition, the motor 100 can be applied to a wide range of general products without being specifically exemplified. The motor 100 functions as a power source for the applied product.

[0016] The motor 100 in this embodiment is a multi-phase AC motor. The motor 100 can perform both power generation and regeneration. The motor 100 can be used as a motor generator. However, the motor 100 does not necessarily have to be able to perform regeneration. The motor 100 may also be a DC motor or a stepping motor.

[0017] In the following, the three mutually orthogonal directions are denoted as axial AD, radial RD, and circumferential CD. Axial AD and radial RD are linear directions, while circumferential CD is the circumferential direction. AD stands for Axial Direction, RD for Radial Direction, and CD for Circumferential Direction. The circumferential direction can also be called the rotational direction. In this embodiment, radial RD corresponds to the first direction, and circumferential CD corresponds to the second direction.

[0018] Furthermore, the line that runs along the axial direction AD and passes through the center of the motor 100 is defined as the motor axis MA. MA is an abbreviation for Motor Axis. Unless otherwise specified, in the following, the direction that intersects and is perpendicular to this motor axis MA will be simply referred to as the radial direction RD. The direction around the motor axis MA will be simply referred to as the circumferential direction CD.

[0019] The motor 100 comprises a housing 200, a shaft 300, a rotor 400, and a stator 500. The housing 200 is made of a metal material. The housing 200 is cylindrical in shape. At least a portion of the shaft 300, the rotor 400, and the stator 500 are housed in the space enclosed by the inner wall surface of the housing 200.

[0020] The shaft 300 extends axially AD along the motor shaft MA. The shaft 300 is supported by bearing members such as bearings in the housing 200. The shaft 300 is rotatable relative to the housing 200. The shaft 300 is the rotation axis of the motor 100.

[0021] The rotor 400 is fixed to the shaft 300. The motor shaft MA passes through the center of the shaft 300 and the center of the rotor 400. The shaft 300 and rotor 400 rotate around the motor shaft MA as their center of rotation. The shaft 300 and rotor 400 rotate relative to the housing 200.

[0022] The stator 500 is fixed to the housing 200. The overall shape of the stator 500 is annular. The motor shaft MA passes through the space enclosed by the stator 500. The rotor 400 and shaft 300 are located in this space. The stator 500 is aligned with the rotor 400 in the radial direction RD, separated by a radial gap.

[0023] As shown above, the rotor 400 is located closer to the center of the motor 100 than the stator 500. The motor 100 in this embodiment is an inner rotor type radial motor. The motor 100 is also a brushless motor.

[0024] <Stator> The stator 500 is an exciter that is energized by the flow of current. The stator 500 can also be called an armature. The stator 500 has a stator core 510 and a stator coil 520. The stator coil 520 is provided on the stator core 510. The stator 500 is energized by the flow of current to this stator coil 520.

[0025] The stator core 510 is made of iron. The stator core 510 contains a soft magnetic material. Magnetic flux generated by the stator coil 520 and the magnet 600 passes through the stator core 510. A magnetic path (magnetic circuit), which is the path for the magnetic flux, is formed in the stator core 510.

[0026] The stator core 510 has a core support portion 530 and core teeth 540. The overall shape of the core support portion 530 is annular. The core support portion 530 is fixed to the housing 200 directly or indirectly. The outer circumferential surface of the core support portion 530 is located radially RD closer to the housing 200 than its inner circumferential surface. The core teeth 540 are connected to the inner circumferential surface of the core support portion 530.

[0027] The core teeth 540 extend radially RD from the inner circumferential surface of the core support portion 530 toward the motor shaft MA. Multiple core teeth 540 are arranged in the circumferential direction CD. The stator coil 520 is wound around these core teeth 540. The stator coil 520 is an electric wire.

[0028] <Rotor> The rotor 400 is a field element. The rotor 400 has a rotor core 410 and magnets 600. The magnets 600 are provided on the rotor core 410. Multiple magnets 600 are arranged in the circumferential direction CD. The magnetic field of the rotor 400 is formed by these multiple magnets 600.

[0029] The rotor core 410 is formed of a metallic material. At least a portion of the rotor core 410 contains a soft magnetic material. However, as will be described later, in this embodiment, magnetic flux does not easily pass through the rotor core 410. Therefore, the rotor core 410 does not necessarily need to contain a soft magnetic material.

[0030] The rotor core 410 has a shaft connecting portion 420, a connecting arm 430, and a magnet support portion 440. The shaft connecting portion 420 is fixed to the shaft 300. The connecting arm 430 connects the shaft connecting portion 420 and the magnet support portion 440. The magnet support portion 440 supports a plurality of magnets 600.

[0031] As shown in Figure 2, the shaft connecting portion 420 is cylindrical. The shaft 300 is inserted through a hole partitioned by the inner wall surface of this shaft connecting portion 420. In this inserted state, the shaft connecting portion 420 is fixed to the shaft 300. The rotor 400 is fixed to the shaft 300.

[0032] The connecting arm 430 extends from the shaft connecting portion 420 toward the magnet support portion 440. Multiple connecting arms 430 are arranged in the circumferential direction CD. The motor shaft MA is located on the extension of the radial direction RD of the multiple connecting arms 430. One end of the connecting arm 430 is connected to the outer circumferential surface of the shaft connecting portion 420. The other end of the connecting arm 430 is connected to the magnet support portion 440.

[0033] The overall shape of the magnet support section 440 is annular. The other ends of multiple connecting arms 430 are connected to the inner circumferential surface of this magnet support section 440. Multiple magnets 600 are provided on the outer circumferential surface of the magnet support section 440. The multiple magnets 600 are fixed to the magnet support section 440 by adhesive or the like.

[0034] The magnet support portion 440 is made of a soft magnetic material. Therefore, magnetic flux passes through the magnet support portion 440. A magnetic path is formed in the magnet support portion 440. The magnet support portion 440 is a back core. The magnet support portion 440 can also be called a yoke or yoke. Note that a magnetic path does not necessarily have to be formed in the magnet support portion 440.

[0035] The magnet 600 is a permanent magnet. Multiple magnets 600 arranged in the circumferential direction CD are connected by an adhesive or the like. These multiple magnets 600 constitute an extension magnet 700 that extends in the circumferential direction CD. The extension magnet 700 is ring-shaped in the circumferential direction CD. The extension magnet 700 is provided on the outer circumferential surface of the magnet support part 440. The extension magnet 700 and the magnet support part 440 are concentric.

[0036] <Magnetic Flux and Magnetic Path> When three-phase AC power is supplied to the stator coil 520, magnetic flux is generated from the stator 500. The magnetic path is determined by the magnetic flux emitted from the stator 500, the magnetic flux emitted from the extension magnets 700 of the rotor 400, and the housing 200 and other components surrounding them.

[0037] The magnetic flux flows from the stator 500 towards the rotor 400, then reverses direction and flows from the rotor 400 towards the stator 500. To explain it by reversing the subject, the magnetic flux flows from the rotor 400 towards the stator 500, then reverses direction and flows from the stator 500 towards the rotor 400. On the stator 500 side, the magnetic flux passes through the core teeth 540 and the core support section 530. On the rotor 400 side, the magnetic flux passes through the extension magnet 700 and the magnet support section 440. Note that the magnetic flux does not necessarily have to pass through the magnet support section 440.

[0038] <Magnets> The following provides a detailed explanation of magnet 600. Magnet 600 includes magnetic material and other materials. Magnet 600 includes sintered magnets, bonded magnets, etc.

[0039] As shown in FIGS. 2 and 4, the magnet 600 has six faces. The magnet 600 has an arc shape extending in the circumferential direction CD. The magnet 600 has an inner surface 600a and an outer surface 600b arranged apart in the radial direction RD, an upper surface 600c and a lower surface 600d arranged apart in the axial direction AD, and a first side surface 600e and a second side surface 600f arranged apart in the circumferential direction CD.

[0040] The inner surface 600a and the outer surface 600b extend in the circumferential direction CD. These are arc-shaped curved surfaces. These are in a concentric relationship. The inner surface 600a is shorter in length in the circumferential direction CD than the outer surface 600b. The separation distance in the radial direction RD between the inner surface 600a and the outer surface 600b is the same even if the measurement position is different in the circumferential direction CD and the axial direction AD. However, the separation distance in the radial direction RD between the inner surface 600a and the outer surface 600b can adopt a configuration in which it gradually becomes longer, for example, toward the axial center side between the upper surface 600c and the lower surface 600d or from the upper surface 600c or the lower surface 600d in the axial direction AD. In a state where the magnet 600 is assembled to the motor 100, the inner surface 600a is located on the rotor core 410 side, and the outer surface 600b is located on the stator 500 side.

[0041] The upper surface 600c and the lower surface 600d extend in a direction perpendicular to the axial direction AD. The upper surface 600c and the lower surface 600d extend parallel to each other. The separation distance in the axial direction AD between the upper surface 600c and the lower surface 600d is the same even if the measurement position is different in the direction perpendicular to the axial direction AD. However, the separation distance in the axial direction AD between the upper surface 600c and the lower surface 600d may become longer or shorter, for example, as it goes from the inner surface 600a side to the outer surface 600b side in the radial direction RD.

[0042] The first side surface 600e and the second side surface 600f extend in the radial direction RD. The extension line of the first side surface 600e and the extension line of the second side surface 600f intersect at the motor axis MA. The separation distance in the circumferential direction CD between the first side surface 600e and the second side surface 600f becomes longer as it moves away from the motor axis MA in the radial direction RD. These first side surface 600e and second side surface 600f are connected via the inner surface 600a, the outer surface 600b, the upper surface 600c, and the lower surface 600d.

[0043] <Orientation> Magnet 600 has an orientation OR. The orientation OR is the easy magnetization direction of the magnetic material contained in the magnet 600. The magnetic material contains magnetic powder. The distribution of the orientation OR is determined by the magnetic material. The orientation OR can also be referred to as magnet orientation. The magnet 600 can also be referred to as an anisotropic magnet.

[0044] In the drawings, the orientation OR is indicated by a solid arrow. The orientation OR is discrete, but for the sake of convenience, in the drawings, these discrete orientations OR are connected and shown as a continuous line. This continuous line also represents the magnetic path within the magnet 600. There can be an infinite number of orientations OR contained in the magnet 600, but a predetermined number is shown in the drawings. In an actual magnet 600, there may be some deviation in the distribution of the orientation OR, but in the drawings, it is shown that a predetermined number of orientations OR are distributed as evenly as possible.

[0045] In this embodiment, the magnitudes of the plurality of discrete orientations OR in one magnet 600 are all the same. Even for a plurality of magnets 600, the magnitude of the orientation OR is constant. However, the magnitudes of the orientations OR contained in one magnet 600 may be different. The magnitudes of the orientations OR of a plurality of magnets 600 may be different.

[0046] FIG. 3 shows three-dimensional polar coordinates for explaining the orientation OR. The circumferential direction CD is the circular direction. However, in FIG. 3, the circumferential direction CD is shown as a straight line as the tangent direction at the intersection of the radial direction RD and the axial direction AD passing through the measurement location of one orientation OR. In other drawings, when the representative radial direction RD is shown, the tangent direction in the circumferential direction orthogonal thereto is shown as the circumferential direction CD.

[0047] The orientation OR can be decomposed into three orientation components: the radial direction RD, the circumferential direction CD, and the axial direction AD. There is a radial orientation component ORr as the orientation component in the radial direction RD. There is a circumferential orientation component ORc as the orientation component in the circumferential direction CD. There is an axial orientation component ORa as the orientation component in the axial direction AD. When these three types of orientation components are combined, they form the orientation OR. The magnitude and direction (angle) of the orientation OR are determined by these three orientation components. In this embodiment, the radial orientation component ORr corresponds to the first orientation component, and the circumferential orientation component ORc corresponds to the second orientation component.

[0048] The orientation OR angle is expressed by the azimuth angle φ and the elevation angle θ. The azimuth angle φ is the angle between the radial direction RD and the orientation OR. The elevation angle θ is the angle between the axial direction AD and the orientation OR.

[0049] When the radial direction RD and the orientation direction OR intersect, two types of angles are formed. The azimuth angle φ is the smaller of these two angles. The magnitude of the azimuth angle φ is 90° or less.

[0050] Similarly, when the axial direction AD and the orientation OR intersect, two types of angles are formed. The elevation angle θ is the smaller of these two angles. The magnitude of the elevation angle θ is 90° or less.

[0051] If the orientation OR has an elevation angle θ, the orientation OR is inclined from the radial direction RD towards the axial direction AD. In other words, the orientation OR is inclined from the axial direction AD towards the radial direction RD. If the orientation OR has an azimuth angle φ, the orientation OR is inclined from the radial direction RD towards the circumferential direction CD. In other words, the orientation OR is inclined from the circumferential direction CD towards the radial direction RD.

[0052] If the magnitude of the orientation OR is A, then the following relationship holds: ORr = Asinθcosφ, ORc = Asinθsinφ, ORa = Acosθ. As described above, in this embodiment, the magnitude of all orientation ORs is constant. Therefore, for example, if the magnitude of the axial orientation component ORa is constant, then if the radial orientation component ORr increases, the circumferential orientation component ORc decreases. Reversing the increase / decrease expression, if the radial orientation component ORr decreases, the circumferential orientation component ORc increases.

[0053] In Figure 2, the first reference line LR1 is shown as a dashed line representing one of the countless radial directions RD. The second reference line LR2 is shown as a dashed line representing one of the countless circumferential directions CD. The third reference line LR3 is shown as a dashed line representing one of the countless axial directions AD.

[0054] The first reference line LR1 passes through the motor shaft MA. The first reference line LR1 is normal to the inner surface 600a and outer surface 600b of the magnet 600. The second reference line LR2 is perpendicular to the first reference line LR1. The second reference line LR2 is tangent to the first reference line LR1 at the intersection in the circumferential direction CD. The second reference line LR2 is spaced radially RD away from the motor shaft MA and passes through the magnet 600. The third reference line LR3 is perpendicular to the first reference line LR1. The third reference line LR3 is spaced radially RD away from the motor shaft MA and passes through the magnet 600. The third reference line LR3 passes through the intersection of the first reference line LR1 and the second reference line LR2.

[0055] The azimuth angle φ of the orientation OR located at the intersection of the first reference line LR1 and the second reference line LR2 is the smaller of the two angles made between the first reference line LR1 and the orientation OR. The elevation angle θ of the orientation OR located at the intersection of the first reference line LR1 and the third reference line LR3 is the smaller of the two angles made between the third reference line LR3 and the orientation OR.

[0056] As shown in Figures 4 and 5, the orientation components of the multiple orientation ORs included in the magnet 600 of this embodiment are of two types: a radial orientation component ORr and a circumferential orientation component ORc. None of the multiple orientation ORs included in the magnet 600 have a radial orientation component ORr. However, at least some of the multiple orientation ORs included in the magnet 600 may have a radial orientation component ORr. Orientation ORs will be explained in detail later.

[0057] <N Magnets and S Magnets> As described above, the rotor 400 equipped with magnets 600 faces the stator 500. As shown in Figures 1 and 2, the magnets 600 include N magnets 600N and S magnets 600S, whose orientation OR in the direction of opposition between the rotor 400 and the stator 500 is in opposite directions. The orientation OR of the N magnet 600N is toward the stator 500 and away from the motor shaft MA. The orientation OR of the S magnet 600S is away from the stator 500 and toward the motor shaft MA.

[0058] To explain orientation OR, in the following, the midpoint between the first side surface 600e and the second side surface 600f in the circumferential direction CD of the magnet 600 is defined as the side center portion 600ef. In the drawing, this side center portion 600ef is shown with a dashed line. The side center portion 600ef is aligned with the radial direction RD.

[0059] The orientation OR of the N magnet 600N is symmetrical in the circumferential direction CD, with respect to the side center portion 600ef as the axis of symmetry. The direction of the orientation OR of the N magnet 600N in the circumferential direction CD is toward the side center portion 600ef of the N magnet 600N.

[0060] The orientation OR of the S magnet 600S is symmetrical in the circumferential direction CD, with respect to the side center portion 600ef as the axis of symmetry. The direction of the orientation OR of the S magnet 600S in the circumferential direction CD is away from the side center portion 600ef of the S magnet 600S.

[0061] <Magnetic Ring Section> As described above, the extension magnet 700 has a plurality of magnets 600 arranged in the circumferential direction CD. The extension magnet 700 of this embodiment has 10 magnets 600. The extension magnet 700 has 5 N magnets 600N and 5 S magnets 600S. Two adjacent magnets 600 in the circumferential direction CD are an N magnet 600N and an S magnet 600S. These N magnets 600N and S magnets 600S are arranged alternately one by one in the circumferential direction CD. The first side surface 600e of one of the adjacent N magnets 600N and S magnets 600S in the circumferential direction CD is adjacent to the second side surface 600f of the other.

[0062] The extension magnet 700 has an extension inner surface 700a and an extension outer surface 700b that are spaced apart in the radial direction RD, and an extension upper surface 700c and an extension lower surface 700d that are spaced apart in the axial direction AD. The extension inner surface 700a, extension outer surface 700b, extension upper surface 700c, and extension lower surface 700d are annular in shape.

[0063] The extended inner surface 700a is formed by the inner surfaces 600a of multiple magnets 600 connected in a circumferential direction CD. The extended outer surface 700b is formed by the outer surfaces 600b of multiple magnets 600 connected in a circumferential direction CD. The extended upper surface 700c is formed flush with the upper surfaces 600c of multiple magnets 600. The extended lower surface 700d is formed flush with the lower surfaces 600d of multiple magnets 600. More precisely, the surface of the extended magnet 700 described above is formed not only by the surfaces of the multiple magnets 600, but also by adhesives and the like that connect the multiple magnets 600.

[0064] Both the extended inner surface 700a and the extended outer surface 700b are curved surfaces with an arc shape. They are concentric circles. The length of the circumferential CD is shorter for the extended inner surface 700a than for the extended outer surface 700b. The radial separation distance RD between the extended inner surface 700a and the extended outer surface 700b is the same even if the measurement position differs in the circumferential CD and axial AD. However, the radial separation distance RD between the extended inner surface 700a and the extended outer surface 700b can also be configured such that, for example, in the axial AD, the distance gradually increases towards the center between the extended upper surface 700c and the extended lower surface 700d, starting from the extended upper surface 700c or the extended lower surface 700d.

[0065] When the extension magnet 700 is assembled to the motor 100, the extension inner surface 700a is located on the rotor core 410 side, and the extension outer surface 700b is located on the stator 500 side. In this embodiment, the entire surface of the extension outer surface 700b faces the stator 500 in the radial direction RD. The magnetic center of the extension outer surface 700b in the axial direction AD and the magnetic center of the stator 500 in the axial direction AD are aligned in the radial direction RD.

[0066] The extended upper surface 700c and the extended lower surface 700d extend in a direction perpendicular to the axial direction AD. The extended upper surface 700c and the extended lower surface 700d extend parallel to each other. The separation distance in the axial direction AD between the extended upper surface 700c and the extended lower surface 700d is the same even if the measurement position differs in a direction perpendicular to the axial direction AD. However, the separation distance in the axial direction AD between the extended upper surface 700c and the extended lower surface 700d may increase or decrease as you move from the extended inner surface 700a side to the extended outer surface 700b side in the radial direction RD.

[0067] The multiple magnets 600 constituting the extension magnet 700 extend in the axial direction A. In this embodiment, the multiple magnets 600 are not aligned in the axial direction A. However, a configuration in which the multiple magnets 600 are aligned in the axial direction A can also be adopted.

[0068] In this embodiment, the magnet 600 is the smallest component of the extension magnet 700. The extension magnet 700 is composed of multiple separate magnets 600. One magnet 600 constitutes one of the multiple magnetic poles included in the extension magnet 700. However, the configuration is not limited to this. The smallest component of the extension magnet 700 may be smaller or larger than the magnet 600 shown in this embodiment. For example, the smallest component may be half the size of the magnet 600, or twice the size. One magnetic pole of the extension magnet 700 may be composed of multiple magnets 600, or multiple magnetic poles may be composed of one magnet 600.

[0069] The extension magnet 700 may be manufactured from a single ring-shaped magnetic material, rather than being manufactured by connecting multiple magnets 600. In this configuration, the extension inner surface 700a is made up of the inner surface 600a of one magnet 600. The extension outer surface 700b is made up of the outer surface 600b of one magnet 600. The extension upper surface 700c is made up of the upper surface 600c of one magnet 600. The extension lower surface 700d is made up of the lower surface 600d of one magnet 600. The orientation OR of the multiple magnetic poles included in the extension magnet 700 is equivalent to the orientation OR of one magnet 600 described in this embodiment.

[0070] <Motor Magnets> As described above, in the extension magnet 700, the first side surface 600e of one of the N magnets 600N and S magnets 600S that are adjacent to each other in the circumferential direction CD is adjacent to the second side surface 600f of the other. Two N magnets 600N are aligned in the circumferential direction CD via one S magnet 600S. Two S magnets 600S are aligned in the circumferential direction CD via one N magnet 600N. Two of either the N magnet 600N or the S magnet 600S are aligned in the circumferential direction CD via one of the other.

[0071] Figures 4 and 5 show one N magnet 600N and one S magnet 600S arranged adjacent to each other in the circumferential direction. The second side surface 600f of the N magnet 600N and the first side surface 600e of the S magnet 600S are adjacent to each other. Of course, the state in which the first side surface 600e of the N magnet 600N and the second side surface 600f of the S magnet 600S are adjacent could also be shown, but for the sake of simplicity in the explanation, such a state has been omitted from the illustration.

[0072] As shown in Figure 4, the N magnet 600N and S magnet 600S are arc-shaped. However, for the sake of simplicity, they are shown as rectangular prisms in Figure 5. Similarly, in Figures 6 to 10, which will be described later, the N magnet 600N and S magnet 600S, which are originally arc-shaped, are shown as rectangular prisms.

[0073] The minimum components necessary to explain the magnetic path of the extension magnet 700 are the S magnet 600S side of the N magnet 600N and the N magnet 600N side of the S magnet 600S, where one N magnet 600N and one S magnet 600S are adjacent to each other in the circumferential direction CD. In the following, a portion of this adjacent N magnet 600N and a portion of the S magnet 600S in the circumferential direction CD will be collectively referred to as the motor magnet 710. The motor magnet 710 includes half of the N magnet 600N and half of the S magnet 600S.

[0074] The motor magnet 710 includes the side center portion 600ef to the second side surface 600f side of the N magnet 600N, and the side center portion 600ef to the first side surface 600e side of the S magnet 600S. In other words, the motor magnet 710 includes the side center portion 600ef to the first side surface 600e side of the N magnet 600N, and the side center portion 600ef to the second side surface 600f side of the S magnet 600S. As described above, in this embodiment, the magnet 600 is the smallest component of the extension magnet 700, but the motor magnet 710 may also be the smallest component of the extension magnet 700.

[0075] Figures 4 to 10 show a motor magnet 710 that includes the side center portion 600ef to the second side surface 600f side of the N magnet 600N, and the side center portion 600ef to the first side surface 600e side of the S magnet 600S. The following explanation will focus on a motor magnet 710 with this configuration. The following explanation is also applicable to a motor magnet 710 that includes the side center portion 600ef to the first side surface 600e side of the N magnet 600N, and the side center portion 600ef to the second side surface 600f side of the S magnet 600S.

[0076] The orientation OR of the N magnet 600N contained in the motor magnet 710 differs between the region on the side center 600ef and the region on the second side surface 600f. In the following, the plane that divides the side center 600ef and the second side surface 600f of the N magnet 600N by the circumferential direction CD is referred to as the first boundary FB. The region between the side center 600ef and the first boundary FB of the N magnet 600N is referred to as the first region 610. The region between the first boundary FB and the second side surface 600f of the N magnet 600N is referred to as the second region 620. The behavior of the orientation OR in these first region 610 and second region 620 is different. In this embodiment, the first boundary FB is aligned with the radial direction RD. In the drawing, the first boundary FB is shown as a dashed line.

[0077] Furthermore, if the plane that divides the central side portion 600ef and the first side surface 600e of the N magnet 600N by the circumferential direction CD is also defined as the first boundary FB, then the region between the central side portion 600ef and the first boundary FB of the N magnet 600N also becomes the first region 610. The region between the first boundary FB and the first side surface 600e of the N magnet 600N also becomes the second region 620.

[0078] The orientation OR of the S magnet 600S contained in the motor magnet 710 differs between the region on the first side surface 600e and the region on the side center 600ef. In the following, the plane that divides the first side surface 600e and the side center 600ef of the S magnet 600S by the circumferential direction CD is referred to as the second boundary SB. The region between the first side surface 600e and the second boundary SB of the S magnet 600S is referred to as the third region 630. The region between the second boundary SB and the side center 600ef of the S magnet 600S is referred to as the fourth region 640. The behavior of the orientation OR in these third region 630 and fourth region 640 is different. In this embodiment, the second boundary SB is along the radial direction RD. In the drawing, the second boundary SB is shown as a dashed line.

[0079] Furthermore, if the plane that divides the second side surface 600f and the side center portion 600ef of the S magnet 600S by the circumferential direction CD is also considered the second boundary SB, then the region between the second side surface 600f and the second boundary SB of the S magnet 600S also becomes the third region 630. The region between the second boundary SB and the side center portion 600ef of the S magnet 600S also becomes the fourth region 640.

[0080] The orientation OR of the N magnet 600N is symmetrical across a plane of symmetry that passes through the side center portion 600ef of the N magnet 600N and divides the N magnet 600N into two parts along the circumferential direction CD. Therefore, the behavior of the orientation OR between the side center portion 600ef and the second side surface 600f in the N magnet 600N is equivalent to the behavior of the orientation OR between the first side surface 600e and the side center portion 600ef in the N magnet 600N.

[0081] The orientation OR of the S magnet 600S is symmetrical across a plane of symmetry that passes through the side center portion 600ef of the S magnet 600S and divides the S magnet 600S into two parts along the circumferential direction CD. Therefore, the behavior of the orientation OR between the first side surface 600e and the side center portion 600ef of the S magnet 600S is equivalent to the behavior of the orientation OR between the side center portion 600ef and the second side surface 600f of the S magnet 600S.

[0082] Furthermore, the rate of change of orientation OR between the first side surface 600e and the side center portion 600ef in the N magnet 600N is equivalent to the rate of change of orientation OR between the first side surface 600e and the side center portion 600ef in the S magnet 600S. The difference in the behavior of the orientation OR between the two is that the radial direction RD and the circumferential direction CD are in opposite directions.

[0083] Similarly, the rate of change of orientation OR between the side center portion 600ef and the second side surface 600f in the N magnet 600N is equivalent to the rate of change of orientation OR between the side center portion 600ef and the second side surface 600f in the S magnet 600S. The difference in the behavior of the orientation OR between the two is that the radial direction RD and the circumferential direction CD are in opposite directions.

[0084] <Length of Motor Magnet> The motor magnet 710 has the first region 610, second region 620, third region 630, and fourth region 640 described above, which are arranged in order in the circumferential direction CD. The second region 620 and the third region 630 are interposed between the first region 610 and the fourth region 640. The lengths of these four regions in the circumferential direction CD can be expressed based on the length (thickness) T of the radial direction RD of the magnet 600.

[0085] The length of the circumferential CD of the motor magnet 710 having the four regions described above is L0. This pole length L0 is longer than the thickness T. In this embodiment, the pole length L0 is longer than twice the thickness T. The pole length L0 is longer than four times the thickness T.

[0086] The pole length L0 is the distance in the circumferential direction CD between the side center 600ef of the N magnet 600N and the side center 600ef of the S magnet 600S. The pole length L0 is the distance in the circumferential direction CD between the center of the circumferential direction CD of the N magnet 600N and the center of the circumferential direction CD of the S magnet 600S. The pole length L0 is the distance in the circumferential direction CD between the poles contained in the extension magnet 700. The pole length L0 is equal to the length of the circumferential direction CD of the N magnet 600N. The pole length L0 is equal to the length of the circumferential direction CD of the S magnet 600S.

[0087] The length of the circumferential CD in the first region 610 is L1. The length of the circumferential CD in the fourth region 640 is L2. These first length L1 and second length L2 are equal to the thickness T. Therefore, the sum of the first length L1 and the second length L2, L1 + L2, is twice the thickness T.

[0088] Note that in Figures 4 and 5, the first length L1 and the second length L2 are shown to be shorter than the thickness T. This is to avoid the magnetic path becoming unclear if the thickness T is shortened. This is to make the magnetic path clear in Figures 4 and 5. As described above, in this embodiment, the first length L1 and the second length L2 are equal to the thickness T.

[0089] The first length L1 and the second length L2 are equal. Therefore, the combined length L1 + L2 is equal to twice the first length L1. The combined length L1 + L2 is equal to twice the second length L2.

[0090] The combined length of the circumferential CD of the second region 620 and the third region 630 is L3. The third length L3 is longer than the length obtained by subtracting twice the thickness T from the magnetic pole length L0. In this embodiment, the third length L3 is longer than the thickness T. More specifically, the third length L3 is longer than twice the thickness T. The third length L3 is longer than the sum of the lengths L1 and L2.

[0091] In Figures 4 and 5, the third length L3 is shown as being approximately the same as the thickness T. This is to clearly indicate the magnetic path. As described above, in this embodiment, the third length L3 is longer than twice the thickness T. However, the third length L3 may be equal to the thickness T. The third length L3 may also be shorter than the thickness T.

[0092] <Orientation of Motor Magnets> The first region 610 and the fourth region 640 have a radial orientation component ORr and a circumferential orientation component ORc. In contrast, the second region 620 and the third region 630 have only the circumferential orientation component ORc out of the radial orientation component ORr and the circumferential orientation component ORc.

[0093] The radial orientation component ORr of the first region 610 and the radial orientation component ORr of the fourth region 640 have opposite radial directions RD. The radial orientation component ORr of the first region 610 is directed from the inner surface 600a to the outer surface 600b. The radial orientation component ORr of the fourth region 640 is directed from the outer surface 600b to the inner surface 600a. In contrast, the circumferential orientation component ORc of the first region 610 and the circumferential orientation component ORc of the fourth region 640 have the same circumferential direction CD. This circumferential orientation component ORc is directed from the fourth region 640 to the first region 610.

[0094] The magnitudes of the radial orientation component ORr and the circumferential orientation component ORc in the first region 610 change. The absolute value of the value obtained by dividing the radial orientation component ORr by the circumferential orientation component ORc in the first region 610 gradually increases as the distance from the second region 620 in the circumferential direction CD increases. The absolute value of the elevation angle θ of orientation OR gradually decreases as the distance from the second region 620 increases.

[0095] In other words, the radial orientation component ORr of the first region 610 gradually increases as it moves away from the second region 620 in the circumferential direction CD. At the same time, the circumferential orientation component ORc of the first region 610 gradually decreases as it moves away from the second region 620 in the circumferential direction CD. To put it another way, the radial orientation component ORr of the first region 610 gradually decreases as it approaches the second region 620 in the circumferential direction CD. At the same time, the circumferential orientation component ORc of the first region 610 gradually increases as it approaches the second region 620 in the circumferential direction CD. The first region 610 corresponds to the first magnet section.

[0096] The magnitudes of the radial orientation component ORr and the circumferential orientation component ORc in the fourth region 640 change. The absolute value of the ratio of the radial orientation component ORr to the circumferential orientation component ORc in the fourth region 640 gradually increases as it moves away from the third region 630 in the circumferential direction CD. The absolute value of the elevation angle θ of orientation OR gradually decreases as it moves away from the fourth region 640.

[0097] In other words, the radial orientation component ORr of the fourth region 640 gradually increases as it moves away from the third region 630 in the circumferential direction CD. At the same time, the circumferential orientation component ORc of the fourth region 640 gradually decreases as it moves away from the third region 630 in the circumferential direction CD. To put it another way, the radial orientation component ORr of the fourth region 640 gradually decreases as it approaches the third region 630 in the circumferential direction CD. At the same time, the circumferential orientation component ORc of the fourth region 640 gradually increases as it approaches the third region 630 in the circumferential direction CD. The fourth region 640 corresponds to the second magnet section.

[0098] As described above, the magnitude of the radially oriented component ORr in the second region 620 and the third region 630 is zero. Therefore, the absolute value of the value obtained by dividing the radially oriented component ORr in the second region 620 and the third region 630 by the circumferentially oriented component ORc is also zero.

[0099] Due to manufacturing variations, the magnitude of the radial orientation component ORr may not be exactly zero. Furthermore, due to measurement errors, it is not possible to determine whether the magnitude of the radial orientation component ORr is exactly zero.

[0100] Therefore, the absolute value of the value obtained by dividing the radial orientation component ORr in the second region 620 and the third region 630 by the circumferential orientation component ORc is, for example, 10, where n is an integer of 1 or more. －ｎ It can also be expressed as follows. The upper limit of n is determined by the measurement error of the orientation OR. n is determined by the measurement method, measuring device, measurement conditions, and measurement environment of the orientation OR. The case of "size zero" will be explained later.

[0101] The direction of the circumferential orientation component ORc in the second region 620 and the third region 630 is toward the direction from the fourth region 640 toward the first region 610. Therefore, the magnetic flux flowing from the third region 630 toward the second region 620 is more likely to pass only through the inside of the motor magnet 710. The second region 620 and the third region 630 correspond to the connecting portion.

[0102] As described above, the radially oriented component ORr of the first region 610 gradually decreases in the circumferential direction CD as it approaches the second region 620, while the circumferentially oriented component ORc gradually increases in the circumferential direction CD as it approaches the second region 620. The second region 620 adjacent to the first region 610 has only the circumferentially oriented component ORc out of the radially oriented component ORr and the circumferentially oriented component ORc.

[0103] Therefore, the difference between the azimuth angle φ of the orientation OR on the second region 620 side in the first region 610 and the azimuth angle φ of the orientation OR in the second region 620 is small. The magnetic path passing through the boundary between the first region 610 and the second region 620 tends to follow the circumferential direction CD. The magnetic flux passing through this boundary tends to flow only inside the first region 610. In addition, the absolute value of the value obtained by dividing the radial orientation component ORr in the first region 610 by the circumferential orientation component ORc gradually increases as it moves away from the second region 620 in the circumferential direction CD. Therefore, the magnetic flux flowing inside the first region 610 tends to flow toward the extended outer surface 700b of the first region 610 and then outward from there.

[0104] Similarly, the radial orientation component ORr of the fourth region 640 gradually decreases as it approaches the third region 630 in the circumferential direction CD, while the circumferential orientation component ORc gradually increases as it approaches the third region 630 in the circumferential direction CD. The third region 630 adjacent to this fourth region 640 has only the circumferential orientation component ORc out of the radial orientation component ORr and the circumferential orientation component ORc.

[0105] Therefore, the difference between the azimuth angle φ of the orientation OR on the third region 630 side in the fourth region 640 and the azimuth angle φ of the orientation OR of the third region 630 is small. The magnetic path passing through the boundary between the third region 630 and the fourth region 640 tends to follow the circumferential direction CD. The magnetic flux passing through this boundary tends to flow only inside the third region 630.

[0106] Due to the orientation OR described above, the magnetic flux that enters the interior of the fourth region 640 from its outer surface 600b flows into the interior of the third region 630 through the boundary between the fourth region 640 and the third region 630. This magnetic flux enters the interior of the second region 620 and flows into the interior of the first region 610 through the boundary between the second region 620 and the first region 610. This magnetic flux then flows into the interior of the first region 610 and flows outwards from its outer surface 600b.

[0107] In other words, the magnetic flux that enters the interior of the S magnet 600S from its outer surface 600b flows only within the S magnet 600S. This magnetic flux flows into the interior of the N magnet 600N through the boundary between the S magnet 600S and the N magnet 600N. This magnetic flux flows only within the N magnet 600N and then flows outwards from its outer surface 600b.

[0108] As described above, the N magnet 600N and S magnet 600S, which are adjacent to each other in the circumferential direction CD, form magnetic paths inside each other and on their outer surfaces 600b. They are less likely to form magnetic paths on their inner surface 600a.

[0109] Due to this configuration, when the magnet 600 is incorporated into the motor 100 as an extension magnet 700, the magnetic flux passing through both the extension magnet 700 and the magnet support portion 440 decreases, while the magnetic flux passing through only the extension magnet 700 increases. In the motor 100 of this embodiment, the magnetic flux passing through the magnet support portion 440 is configured to be zero.

[0110] <Measurement of Orientation> The orientation OR, which is determined by the combination of multiple types of orientation components, can be measured by the following method. For example, the measurer takes out the motor magnet 710 contained in the motor 100 as the object to be measured. The measurer then measures the magnetic flux of the object to be measured and identifies the magnetic path by magnetic circuit analysis. Through such identification, the orientation OR can be estimated.

[0111] Furthermore, the operator may measure the orientation OR using electron backscatter diffraction. Electron backscatter diffraction can also be called EBSD. Electron backscatter diffraction is a method for measuring the crystal orientation of the motor magnet 710. By electron backscatter diffraction, the direction of the easy magnetization axis (easy magnetization direction) can be quantitatively evaluated. That is, the direction of the orientation OR can be quantitatively evaluated. As described above, the orientation OR can be measured by identifying the magnetic path by magnetic circuit analysis and quantitatively evaluating the direction of the easy magnetization axis by electron backscatter diffraction.

[0112] <Size is zero> A single magnet 600 has countless orientations OR. It is impossible to precisely design all of these orientations OR and to precisely design the radial orientation component ORr, the circumferential orientation component ORc, and the axial orientation component ORa. It is impossible to precisely measure all of these orientations OR and to precisely evaluate the radial orientation component ORr, the circumferential orientation component ORc, and the axial orientation component ORa.

[0113] It is not possible to design some of the multiple orientation components to be non-zero while strictly designing the rest to be zero due to manufacturing variations. It is not possible to evaluate some of the multiple orientation components to be non-zero while strictly evaluating the rest to be zero due to measurement errors. Despite these circumstances, in order to clarify the design concept, this disclosure states that the magnitude of the radial orientation component ORr in the second region 620 and the third region 630 is zero.

[0114] The magnitude of zero described in this disclosure includes a finite value that is less than or equal to the absolute value of the manufacturing variation or less than or equal to the measurement error. Therefore, the magnitude of the radial orientation component ORr of the second region 620 and the third region 630 can also be expressed as being less than or equal to the absolute value of the manufacturing variation. The magnitude of the radial orientation component ORr of the second region 620 and the third region 630 can also be expressed as being less than or equal to the absolute value of the measurement error.

[0115] The magnitude of the orientation OR of the motor magnet 710 can be evaluated by, for example, employing the following method: Divide the motor magnet 710 into 10 sections in the radial direction RD. Then, divide each section into 10 sections in the circumferential direction CD. In this way, the motor magnet 710 is divided into 100 sections. Then, calculate the arithmetic mean of the radial orientation component ORr and the circumferential orientation component ORc that appear on the divided surfaces. Evaluate whether this value falls within the range of measurement error. In this way, it may be possible to evaluate whether some of the multiple orientation components are substantially not zero, and whether the rest are substantially zero.

[0116] The number of divisions mentioned above is merely an example. The number of divisions may be increased or decreased. Similarly, the division intervals may be equal or unequal. The division direction is also not particularly limited. Any division interval, number of divisions, and division direction that are suitable for evaluating the orientation OR tendency of the motor magnet 710 are not particularly limited. The motor magnet 710 may be divided into multiple parts, and the magnitude of the orientation component may be evaluated based on whether the average value of the orientation component appearing on the division surface is less than or equal to the measurement error when this measurement method is used.

[0117] <Effects> The motor magnet 710 has a first region 610, a second region 620, a third region 630, and a fourth region 640, which are arranged in order along the circumferential direction CD. The absolute value of the ratio of the radial orientation component ORr in the first region 610 and the fourth region 640 to the circumferential orientation component ORc gradually increases as the distance from the second region 620 and the third region 630 in the circumferential direction CD increases. The second region 620 and the third region 630 do not have a radial orientation component ORr, but they do have a circumferential orientation component ORc.

[0118] Therefore, the motor magnet 710 forms a magnetic path both inside and on its outer surface 600b. The motor magnet 710 is less likely to form a magnetic path on its inner surface 600a. This suppresses the influence of the magnetic flux emitted from the motor magnet 710 on the inner surface 600a of the motor magnet 710.

[0119] A magnet support portion 440 is provided on the inner surface 600a side of the motor magnet 710. The magnetic flux passing through this magnet support portion 440 is reduced. The magnet support portion 440 becomes less susceptible to magnetic saturation. As a result, the design freedom of the magnet support portion 440 is increased. For example, the length (thickness) of the radial RD of the magnet support portion 440 can be shortened. The amount of soft magnetic material contained in the magnet support portion 440 can be reduced. If no magnetic path is formed on the inner surface 600a side, or if it is so small that it can be ignored, a material lighter than soft magnetic material can be used as the constituent material of the magnet support portion 440. This makes it possible to lighten the rotor 400. This makes it possible to lighten the motor 100.

[0120] Furthermore, as mentioned above, the design flexibility of the magnet support section 440 is increased, making it easier to adjust the spacing between the rotor 400 and the stator 500 within the housing 200. This makes it easier to adjust the magnetic path formed between them, and thus easier to adjust the torque generated in the rotor 400.

[0121] The length of the circumferential CD (magnetic pole length L0) of the motor magnet 710 is longer than twice the length of the radial RD (thickness T) of the motor magnet 710. The magnetic pole length L0 is longer than four times the thickness T. In other words, the thickness T is one-quarter of the magnetic pole length L0. The reason such a thin thickness T is possible is that, due to the orientation OR described above, the influence of the magnetic flux emitted from the motor magnet 710 on the inner surface 600a side of the motor magnet 710 is suppressed.

[0122] The third length L3 of the circumferential CD, which is the sum of the second region 620 and the third region 630, is longer than the thickness T, twice the thickness T, and the sum of the lengths L1 and L2. In this way, the region in the motor magnet 710 that contains only the circumferential orientation component ORc is longer. In other words, the region in the motor magnet 710 that contains the radial orientation component ORr is shorter. Therefore, the formation of a magnetic path on the inner surface 600a side of the motor magnet 710 is suppressed.

[0123] The first length L1 and the second length L2 are equal to the thickness T. In this configuration, the curvature of the orientation OR of the first region 610 and the fourth region 640 in a plane perpendicular to the axial direction AD can be made uniform. The orientation OR can be semicircular in shape.

[0124] Furthermore, the first boundary FB, which is the boundary between the first region 610 and the second region 620, is aligned with the radial direction RD. The second boundary SB, which is the boundary between the third region 630 and the fourth region 640, is aligned with the radial direction RD. Due to the configuration of these boundaries and the curvature of the orientation OR described above, the difference between the azimuth angle φ of the orientation OR on the second region 620 side in the first region 610 and the azimuth angle φ of the orientation OR in the second region 620 is kept to a minimum. The difference between the azimuth angle φ of the orientation OR in the third region 630 and the azimuth angle φ of the orientation OR on the third region 630 side in the fourth region 640 is kept to a minimum.

[0125] This makes it easier for the angular change of orientation OR in the circumferential direction CD to be continuous at the first boundary FB and the second boundary SB. Near these boundaries, a magnetic path is more likely to form only inside the motor magnet 710.

[0126] Furthermore, the first length L1 and the second length L2 may be longer than the thickness T. In this configuration, the curvature of the orientation OR of the first region 610 and the fourth region 640 in a plane perpendicular to the axial direction AD can be made gentler than a uniform circular arc shape. The rate of change between the radial orientation component ORr and the circumferential orientation component ORc in the circumferential direction CD of the first region 610 and the fourth region 640 is suppressed to be abrupt. The formation of a magnetic path on the inner surface 600a side of the motor magnet 710 is suppressed.

[0127] Furthermore, the first length L1 and the second length L2 may be shorter than the thickness T. In this configuration, the curvature of the orientation OR of the first region 610 and the fourth region 640 in the plane perpendicular to the axial direction AD becomes steep. The rate of change of the radial orientation component ORr and the circumferential orientation component ORc in the circumferential direction CD of the first region 610 and the fourth region 640 becomes steep. As a result, the angular change of the orientation OR in the circumferential direction CD at the first boundary FB and the second boundary SB tends to be discontinuous. Although this configuration is achieved, the formation of a magnetic path on the inner surface 600a side of the motor magnet 710 is suppressed due to the second region 620 and the third region 630 described above. For this reason, the first length L1 and the second length L2 may be shorter than the thickness T.

[0128] <Second Embodiment> This embodiment will be described primarily in terms of its differences from the first embodiment. In subsequent embodiments, the differences from the previously described embodiment will also be described primarily in terms of their differences. Configurations, operations, and effects that are not specifically described in other embodiments are the same as those in the previously described embodiment.

[0129] In the first embodiment, an example was shown in which the first boundary FB, which indicates the boundary between the first region 610 and the second region 620, is aligned with the radial direction RD, and the second boundary SB, which indicates the boundary between the third region 630 and the fourth region 640, is aligned with the radial direction RD.

[0130] In contrast, in this embodiment, as shown in Figure 6, the first boundary FB and the second boundary SB are inclined with respect to the radial direction RD. Due to this configuration, the length of the circumferential CD on the inner surface 600a side and the length of the circumferential CD on the outer surface 600b side are different in the first region 610 to the fourth region 640.

[0131] The length of the circumferential CD on the inner surface 600a side of the first region 610 is L11, and the length of the circumferential CD on the outer surface 600b side is L12. The 11th length L11 is shorter than the 12th length L12. The length of the circumferential CD of the first region 610 decreases in the radial direction RD from the outer surface 600b toward the inner surface 600a.

[0132] As explained using Figure 6, the first region 610 has a trapezoidal shape, where the lower base on the inner surface 600a is shorter than the upper base on the outer surface 600b. Strictly speaking, the upper and lower bases are arc-shaped, so the shape of the first region 610 is not exactly a trapezoid.

[0133] The length of the circumferential CD on the inner surface 600a side of the fourth region 640 is L21, and the length of the circumferential CD on the outer surface 600b side is L22. The 21st length L21 is shorter than the 22nd length L22. The length of the circumferential CD of the fourth region 640 decreases in the radial direction RD from the outer surface 600b toward the inner surface 600a.

[0134] Due to this configuration, the fourth region 640 has a trapezoidal shape, with the lower base on the inner surface 600a side being shorter than the upper base on the outer surface 600b side. Strictly speaking, however, since the upper and lower bases are arc-shaped, the shape of the fourth region 640 is not exactly a trapezoid.

[0135] The 11th length L11 and the 21st length L21 on the inner surface 600a are equal. These are shorter than the thickness T. The 12th length L12 and the 22nd length L22 on the outer surface 600b are equal. These are shorter than the thickness T. Note that these two lengths on the outer surface 600b may be longer than the thickness T. The two lengths on the inner surface 600a may also be longer than the thickness T.

[0136] The combined length L11 + L21 of the 11th length L11 and the 21st length L21 is shorter than the thickness T. The combined length L12 + L22 of the 12th length L12 and the 22nd length L22 is longer than the thickness T. Note that the combined length L11 + L21 may be longer than the thickness T. The combined length L12 + L22 may be shorter than the thickness T.

[0137] The length of the circumferential CD on the inner surface 600a side, which combines the second region 620 and the third region 630, is L31, and the length of the circumferential CD on the outer surface 600b side is L32. The 31st length L31 is longer than the 32nd length L32. The length of the circumferential CD of the second region 620 and the third region 630 increases in the radial direction RD from the outer surface 600b toward the inner surface 600a.

[0138] Due to this configuration, the second region 620 and the third region 630 have a trapezoidal shape, with the lower base on the inner surface 600a side being longer than the upper base on the outer surface 600b side. Strictly speaking, however, since the upper and lower bases are arc-shaped, the shapes of the second region 620 and the third region 630 are not exactly trapezoidal.

[0139] The 31st length L31 and the 32nd length L32 are longer than the thickness T. The 31st length L31 and the 32nd length L32 are longer than the combined length L11 + L12 + L21 + L22. However, the 31st length L31 and the 32nd length L32 may be shorter than the thickness T. The 31st length L31 may be longer than the thickness T, and the 32nd length L32 may be shorter than the thickness T.

[0140] With this configuration, the second region 620 and the third region 630 included on the inner surface 600a side of the motor magnet 710 become larger. That is, the proportion of the circumferential orientation component ORc included on the inner surface 600a side of the motor magnet 710 becomes higher. As a result, the formation of a magnetic path on the inner surface 600a side by the magnetic flux emitted by the motor magnet 710 is suppressed.

[0141] Furthermore, as shown by the orientation OR and the number and distribution of solid arrows indicating the magnetic path, in this embodiment, as shown in Figure 6, the area that contributes to the formation of the magnetic path on the outer surface 600b side in the first region 610 and the fourth region 640 increases. The area that contributes to the formation of torque increases. This is because the increase in the area R that does not contribute to the formation of the magnetic path on the outer surface 600b side is suppressed on the inner surface 600a side of the first region 610 and the fourth region 640.

[0142] In the drawing, the region R that does not contribute to the formation of the magnetic path on the outer surface 600b is enclosed by a dashed line. To emphasize this region R, the orientation OR and solid arrows indicating the magnetic path are not shown in region R. Region R is located on the central side of the circumferential direction CD of the N magnet 600N and the S magnet 600S, and on the inner surface 600a side of the radial direction RD compared to the outer surface 600b. Region R is located on the inner surface 600a side of the first region 610 and the fourth region 640, away from the second region 620 and the third region 630 in the circumferential direction CD.

[0143] As described above, the increase in the region R that does not contribute to the formation of the magnetic path on the outer surface 600b is suppressed. Therefore, if the orientation OR is included in this region R, the formation of the magnetic path on the inner surface 600a is suppressed by that orientation OR.

[0144] <Third Embodiment> In this embodiment, the relationship between the length of the inner surface 600a and the outer surface 600b of the first region 610 to the fourth region 640 is different from that of the second embodiment.

[0145] As shown in Figure 7, the 11th length L11 is longer than the 12th length L12. The length of the circumferential CD of the first region 610 increases from the outer surface 600b toward the inner surface 600a. Therefore, the first region 610 has a shape similar to a trapezoid, where the lower base on the inner surface 600a side is longer than the upper base on the outer surface 600b side.

[0146] The 21st length L21 is longer than the 22nd length L22. The length of the circumferential CD of the 4th region 640 increases from the outer surface 600b toward the inner surface 600a. Therefore, the 4th region 640 has a shape similar to a trapezoid, where the lower base on the inner surface 600a side is longer than the upper base on the outer surface 600b side.

[0147] The 31st length L31 is shorter than the 32nd length L32. The length of the circumferential CD in the second region 620 and the third region 630 decreases as you move from the outer surface 600b towards the inner surface 600a. As a result, the second region 620 and the third region 630 have a shape similar to a trapezoid, where the lower base on the inner surface 600a side is shorter than the upper base on the outer surface 600b side.

[0148] Due to the configuration described above, the rate of change between the radial orientation component ORr and the circumferential orientation component ORc in the circumferential CD on the inner surface 600a side of the first region 610 and the fourth region 640 is suppressed. As a result, the formation of a magnetic path on the inner surface 600a side of the motor magnet 710 is suppressed.

[0149] The length-to-length relationship between the inner surface 600a and the outer surface 600b of the first to fourth regions 610 to 640, as described above, that is, the shape of the first to fourth regions 610 to 640, can be appropriately determined according to the shape of the core teeth 540 of the stator 500, etc.

[0150] <Fourth Embodiment> In the first embodiment, an example was shown in which the minimum components of the extension magnet 700 were an N magnet 600N and an S magnet 600S. In contrast, in this embodiment, as shown in Figure 8, the minimum components of the extension magnet 700 are the first magnet piece 720, the second magnet piece 730, the third magnet piece 740, and the fourth magnet piece 750.

[0151] The first magnet piece 720 constitutes the central side of the circumferential CD in the N magnet 600N. The second magnet piece 730 constitutes the central side of the circumferential CD in the S magnet 600S. The third magnet piece 740 constitutes the second side surface 600f side of the circumferential CD of the N magnet 600N and the first side surface 600e side of the circumferential CD of the S magnet 600S. The fourth magnet piece 750 constitutes the second side surface 600f side of the circumferential CD of the S magnet 600S and the first side surface 600e side of the circumferential CD of the N magnet 600N.

[0152] In this embodiment, the boundary between the N magnet 600N and the S magnet 600S is included in the third magnet piece 740. The boundary between the S magnet 600S and the N magnet 600N is included in the fourth magnet piece 750. Therefore, the boundary between the N magnet 600N and the S magnet 600S is substantially nonexistent. The first side surface 600e and the second side surface 600f are substantially nonexistent. However, in order to clarify the boundary between the N magnet 600N and the S magnet 600S and to simplify the explanation, the reference numerals indicating these two side surfaces are shown in Figure 8.

[0153] In other words, the first magnet piece 720 constitutes the first region 610 contained within the N magnet 600N. The second magnet piece 730 constitutes the fourth region 640 contained within the S magnet 600S. The third magnet piece 740 constitutes the second region 620 and the third region 630, which are arranged sequentially in the circumferential direction CD. The fourth magnet piece 750 constitutes the third region 630 and the second region 620, which are arranged in the circumferential direction CD in the opposite direction to the third magnet piece 740.

[0154] One motor magnet 710 is composed of the entirety of one of the third magnet piece 740 and the fourth magnet piece 750, and half of both the first magnet piece 720 and the second magnet piece 730.

[0155] The motor magnet 710, which includes a third magnet piece 740, has a first magnet piece 720 and half of a second magnet piece 730 that are aligned circumferentially with respect to the third magnet piece 740. This motor magnet 710 has the first magnet piece 720 on the side of the third magnet piece 740 and the second magnet piece 730 on the side of the third magnet piece 740.

[0156] The motor magnet 710, which includes a fourth magnet piece 750, has a second magnet piece 730 and half of a first magnet piece 720 that are aligned circumferentially with respect to the fourth magnet piece 750. This motor magnet 710 has the second magnet piece 730 on the side of the fourth magnet piece 750 and the first magnet piece 720 on the side of the fourth magnet piece 750.

[0157] The first magnet piece 720 and the second magnet piece 730 have a radial orientation component ORr and a circumferential orientation component ORc. In the first magnet piece 720 and the second magnet piece 730, the radial orientation component ORr is in opposite directions, and the circumferential orientation component ORc is in opposite directions.

[0158] The third magnet piece 740 and the fourth magnet piece 750 have a circumferential orientation component ORc. The circumferential orientation component ORc of the third magnet piece 740 and the fourth magnet piece 750 are in opposite directions.

[0159] The first magnet piece 720 and the second magnet piece 730 are aligned in the circumferential direction CD via the third magnet piece 740. The first magnet piece 720 and the second magnet piece 730 are joined via the third magnet piece 740. The second magnet piece 730 and the first magnet piece 720 are aligned in the circumferential direction CD via the fourth magnet piece 750. The second magnet piece 730 and the first magnet piece 720 are joined via the fourth magnet piece 750. The first magnet piece 720, the third magnet piece 740, the second magnet piece 730, and the fourth magnet piece 750 are aligned in the circumferential direction CD in order, and adjacent magnet pieces are joined to each other.

[0160] In this way, regions with different orientation components are manufactured individually. This simplifies the equipment required for magnetic orientation. It also facilitates the manufacture of these individual magnet pieces. This makes it easier to connect them to form motor magnets 710 and extension magnets 700.

[0161] Unlike this embodiment, regions with different orientation components may be manufactured integrally. That is, the first region 610 to the fourth region 640 may be manufactured integrally. A portion of these four types of regions may be manufactured integrally. Alternatively, the first magnet piece 720 to the fourth magnet piece 750 may be manufactured integrally. A portion of these four types of magnet pieces may be manufactured integrally.

[0162] The minimum number of components of the extension magnet 700 may be determined according to the ease of magnetic orientation. Which components are integrated and which are separate can be determined according to the desired orientation OR, the desired shape of the magnet 600, and the desired shape of the extension magnet 700.

[0163] <Fifth Embodiment> As described above, the motor magnet 710 includes a region R that does not contribute to the formation of the magnetic path on the outer surface 600b side. As shown in Figure 9, in this embodiment, a part of this region R is cut out. The side of the circumferential direction CD on the inner surface 600a side of the first region 610 and the fourth region 640 that is separated from the second region 620 and the third region 630 is cut out.

[0164] A portion of the inner surface 600a side in region R of the N magnet 600N is cut out. A first cut-out region COR1 is formed in the N magnet 600N. Similarly, a portion of the inner surface 600a side in region R of the S magnet 600S is cut out. A second cut-out region COR2 is formed in the S magnet 600S.

[0165] According to this, the formation of a magnetic path on the inner surface 600a side is suppressed by the orientation OR included in the region R which does not contribute to torque formation.

[0166] Furthermore, the first notch region COR1 is filled by the first projection 441. The second notch region COR2 is filled by the second projection 442. The first projection 441 and the second projection 442 are integrally connected to the magnet support portion 440.

[0167] According to this, alignment between the magnet support part 440 and the motor magnet 710 becomes easier. Alignment between the magnet support part 440 and the extension magnet 700 becomes easier.

[0168] In this embodiment, the magnet support portion 440, the first projection 441, and the second projection 442 do not necessarily have to be made of soft magnetic material. They may be made of non-magnetic resin material. The magnet support portion 440 corresponds to the fixing member. The first projection 441 and the second projection 442 correspond to the projections.

[0169] <Sixth Embodiment> The magnetic flux enters the interior of the S magnet 600S from the center of the circumferential CD on the outer surface 600b. This magnetic flux flows inside the S magnet 600S and the N magnet 600N. Subsequently, this magnetic flux flows outwards from the center of the circumferential CD on the outer surface 600b of the N magnet 600N.

[0170] Thus, the central side of the circumferential CD on the outer surface 600b of the magnet 600 is where the magnetic flux flows in and out. In this embodiment, at least a portion of the central side of the circumferential CD on the outer surface 600b of the magnet 600, which facilitates the inflow and outflow of this magnetic flux, is cut out.

[0171] The notched region of the N magnet 600N is filled with the first soft magnetic material 650. The notched region of the S magnet 600S is filled with the second soft magnetic material 660. As their names suggest, the constituent materials of these first soft magnetic material 650 and second soft magnetic material 660 are soft magnetic materials.

[0172] The first soft magnetic material 650 is located on the outer surface 600b side of the first region 610, on the side of the circumferential direction CD away from the second region 620 and the third region 630. The second soft magnetic material 660 is located on the outer surface 600b side of the fourth region 640, on the side of the circumferential direction CD away from the second region 620 and the third region 630.

[0173] This configuration makes it easier to pass magnetic flux through the first soft magnetic material 650 and the second soft magnetic material 660. It also makes it easier to concentrate magnetic paths in these materials. As a result, magnetic paths are more likely to form on the outer surface 600b side than on the inner surface 600a side. The formation of magnetic paths on the inner surface 600a side is suppressed.

[0174] Furthermore, it is not necessary to form a notch on the outer surface 600b. A configuration in which the first soft magnetic material 650 and the second soft magnetic material 660 are simply provided on the outer surface 600b can also be adopted.

[0175] <Seventh Embodiment> In this embodiment, as shown in Figure 11, the rotor 400 has a support portion 450 instead of a rotor core 410. The support portion 450 contains a non-magnetic material such as resin. The support portion 450 supports the extension magnet 700 and also serves to connect the extension magnet 700 to the shaft 300. The support portion 450 corresponds to a fixing member.

[0176] <Eighth Embodiment> In the first embodiment, an example was shown in which the motor 100 is an inner rotor type radial motor. In contrast, in this embodiment, as shown in Figure 12, the motor 100 is an outer rotor type radial motor. Note that the housing 200 and shaft 300 are not shown in Figure 12.

[0177] As shown in Figure 12, the stator 500 is located closer to the center of the motor 100 than the rotor 400. The rotor 400 is further away from the motor shaft MA in the radial direction RD than the stator 500.

[0178] The rotor 400 has an annular shape. Multiple magnets 600 are provided on the inner circumferential surface of the magnet support portion 440. An annular extension magnet 700 is formed. The motor shaft MA passes through the space enclosed by the extension magnet 700. The stator 500 is provided in this space. The rotor 400 is aligned with the stator 500 in the radial direction RD across a radial gap.

[0179] The core support portion 530 is annular in shape. Core teeth 540 are connected to the outer circumferential surface of the core support portion 530. The core teeth 540 extend radially RD from the outer circumferential surface of the core support portion 530 toward the rotor 400. Multiple core teeth 540 are arranged in the circumferential direction CD.

[0180] In this configuration, the inner surface 600a of the magnet 600 included in the rotor 400 is located closer to the stator 500 than its outer surface 600b. This magnet 600 is designed to form a magnetic path on the inner surface 600a side, while making it difficult for a magnetic path to form on the outer surface 600b side. In this embodiment, the relationship between the inner surface 600a and the outer surface 600b described above is reversed. The first surface corresponds to the outer surface 600b. The second surface corresponds to the inner surface 600a.

[0181] Furthermore, as shown in Figure 13, the magnet 600 and the magnet support portion 440 are aligned in the axial direction AD. They are positioned opposite each other in the axial direction AD. The position of the magnet 600 in the axial direction AD is different from the position of the magnet support portion 440 in the axial direction AD. In this way, the magnet support portion 440 does not have a region aligned in the radial direction RD in order to support the magnet 600. Therefore, the magnet support portion 440 is made lighter. The arrangement of the magnet 600 in the radial direction RD is not restricted by the magnet support portion 440. The magnet support portion 440 can be made of a non-magnetic material.

[0182] <Ninth Embodiment> In the first embodiment, an example was shown in which the stator 500 is the exciter and the rotor 400 is the field element. In contrast, in this embodiment, the rotor 400 is the exciter and the stator 500 is the field element. As shown in Figure 14, the stator 500, not the rotor 400, has the magnet 600. The rotor 400 has a rotor coil 470 instead of the magnet 600. Note that the housing 200 is not shown in Figure 14.

[0183] The stator core 510 has a core support portion 530. The core support portion 530 contains a soft magnetic material. The overall shape of the core support portion 530 is annular. Multiple magnets 600 are provided on the inner circumferential surface of the core support portion 530. The core support portion 530 performs the same function as the magnet support portion 440 described in the first embodiment. The core support portion 530 does not necessarily contain a soft magnetic material.

[0184] A ring-shaped extension magnet 700 is formed by multiple magnets 600. A rotor 400 is provided in the space enclosed by this extension magnet 700.

[0185] The rotor core 410 has a shaft connecting portion 420 and rotor teeth 460. The shaft connecting portion 420 is annular in shape. The rotor teeth 460 are connected to the outer circumferential surface of the shaft connecting portion 420. The rotor teeth 460 extend from the shaft connecting portion 420 toward the stator 500. The motor shaft MA is located on the extension of the radial direction RD of the rotor teeth 460. Multiple rotor teeth 460 are arranged in the circumferential direction CD. A rotor coil 470 is wound around these multiple rotor teeth 460. When current is supplied to this rotor coil 470, the rotor 400 is energized.

[0186] As described above, the motor 100 of this embodiment is an inner rotor type radial motor. However, the motor 100 of this embodiment can also be used as an outer rotor type radial motor as described in the eighth embodiment.

[0187] In this configuration, the inner surface 600a of the magnet 600 included in the stator 500 is located closer to the rotor 400 than its outer surface 600b. In this embodiment, similar to the eighth embodiment, the magnet 600 is designed to form a magnetic path on the inner surface 600a side and to make it difficult for a magnetic path to form on the outer surface 600b side. The first surface corresponds to the outer surface 600b, and the second surface corresponds to the inner surface 600a. The core support portion 530 does not necessarily have to contain a soft magnetic material.

[0188] <Tenth Embodiment> In the previous embodiments, an example was shown where the motor 100 is a radial motor. In contrast, in this embodiment, the motor 100 is an axial motor. The circumferential direction CD corresponds to the second direction, and the axial direction AD corresponds to the first direction. The circumferential orientation component ORc corresponds to the second orientation component, and the axial orientation component ORa corresponds to the first orientation component.

[0189] The main difference between a radial motor and an axial motor lies in the direction in which the rotor 400 and stator 500 face each other. In a radial motor, the rotor 400 and stator 500 face each other in the radial direction RD. In contrast, in an axial motor, as shown in Figures 15 to 17, the rotor 400 and stator 500 face each other in the axial direction AD. Figures 15 to 17 are diagrams illustrating the arrangement of the rotor 400 and stator 500 in an axial motor. For this reason, some components of the axial motor are omitted from the illustration in Figures 15 to 17.

[0190] Because of these significant differences, when applying the configuration of the radial motor described above to the configuration of the axial motor of this embodiment, the radial RD characteristics of the radial motor are applied to the axial AD characteristics of the axial motor.

[0191] To explain in detail regarding orientation OR, the characteristics of the radial orientation component ORr of a radial motor are applicable to the characteristics of the axial orientation component ORa of an axial motor. The characteristics of the axial orientation component ORa of a radial motor are applicable to the characteristics of the radial orientation component ORr of an axial motor. However, the characteristics of the circumferential orientation component ORc are the same for both radial and axial motors. The configuration of the motor 100 of this embodiment will be outlined below.

[0192] As shown in Figure 17, the housing 200 has a bottom plate 210 and side walls 220. The bottom plate 210 is a thin plate shape with a thickness in the axial direction AD. The bottom plate 210 has an inner bottom surface and an outer bottom surface aligned in the axial direction AD. The side walls 220 stand upright from this inner bottom surface. The side walls 220 form an annular shape so as to surround the entire inner bottom surface of the bottom plate 210. A part of the shaft 300, the rotor 400, and the stator 500 are housed in the space enclosed by the bottom plate 210 and the side walls 220. Inside the housing 200, the rotor 400 and the stator 500 are aligned in the axial direction AD with an axial gap between them. The bottom plate 210 has a hole that penetrates the inner bottom surface and the outer bottom surface in the axial direction AD. The shaft 300 passes through this hole in the bottom plate 210.

[0193] The core support portion 530 of the stator core 510 has an overall disc shape. The core support portion 530 closes the opening of the housing 200, which is partitioned by the tip of the annular side wall 220.

[0194] The core support portion 530 has two main surfaces, a first main surface and a second main surface, aligned in the axial direction AD. A hole is formed in the core support portion 530 that penetrates these first and second main surfaces in the axial direction AD. The shaft 300 passes through this hole in the core support portion 530. The first main surface is located closer to the bottom plate 210 of the housing 200 in the axial direction AD than the second main surface. The core teeth 540 are connected to this first main surface.

[0195] The core teeth 540 extend axially AD from the core support portion 530 toward the bottom plate 210. Multiple core teeth 540 are arranged circumferentially CD around a hole formed in the core support portion 530. The stator coil 520 is wound around these core teeth 540.

[0196] The overall shape of the shaft connecting portion 420 of the rotor core 410 is disc-shaped. The shaft connecting portion 420 has a support surface and a back surface aligned in the axial direction AD. A hole is formed in the shaft connecting portion 420 that penetrates these support surface and back surface in the axial direction AD. The shaft connecting portion 420 is fixed to the shaft 300 with the shaft 300 inserted through this hole.

[0197] With the rotor 400 housed in the housing 200, the back surface of the shaft connecting portion 420 is located closer to the bottom plate 210 of the housing 200 than the support surface. The support surface of the shaft connecting portion 420 is located closer to the stator 500 than the back surface. Multiple magnets 600 are provided on this support surface. In this embodiment, the shaft connecting portion 420 also serves the function of supporting the magnets 600.

[0198] Multiple magnets 600 are arranged in a ring shape in the circumferential direction CD so as to surround a hole formed in the shaft connecting portion 420. This constitutes an annular extension magnet 700. The extended upper surface 700c of this extension magnet 700 is located closer to the support surface of the shaft connecting portion 420 than the extended lower surface 700d. The extended lower surface 700d is located closer to the stator 500 than the extended upper surface 700c. The extension magnet 700 and the multiple core teeth 540 around which the stator coil 520 is wound are aligned in the axial direction AD.

[0199] As shown in Figure 18, the multiple orientation ORs contained in one magnet 600 have a circumferential orientation component ORc. This orientation OR has an axial orientation component ORa instead of a radial orientation component ORr.

[0200] As shown in Figures 15 and 16, in this embodiment, the rotor 400 has four magnets 600 of equal size. N magnets 600N and S magnets 600S are arranged alternately in the circumferential direction CD. Therefore, magnets 600 with the same polarity are arranged in the radial direction RD. Two N magnets 600N are arranged in the radial direction RD. Two S magnets 600S are arranged in the radial direction RD. Depending on the number of magnets 600 that the rotor 400 has, magnets 600 with opposite polarity may be arranged in the radial direction RD. For example, if the rotor 400 has 10 magnets 600, N magnets 600N and S magnets 600S will be arranged in the radial direction RD.

[0201] The elevation angles θ of the orientation OR of the multiple magnets 600 arranged in the circumferential direction CD are twofold symmetric with respect to the shaft 300. That is, the elevation angles θ of the orientation OR of the extension magnet 700 are twofold symmetric with respect to the shaft 300.

[0202] All of the multiple orientations OR contained in a single magnet 600 have a circumferential orientation component ORc and an axial orientation component ORa, but do not have a radial orientation component ORr.

[0203] As detailed in the first embodiment, the orientation OR can be varied in various ways in the axial motor of this embodiment as well. For example, the orientation OR may have a radial orientation component ORr.

[0204] Furthermore, an axial motor may have multiple rotors 400 and multiple stators 500. For example, motor 100 may have two rotors 400. A stator 500 may be provided between the two rotors 400. This configuration can also be called a double-rotor motor. Alternatively, motor 100 may have two stators 500. A rotor 400 may be provided between the two stators 500. This configuration can also be called a double-stator motor. In such configurations where an axial motor has multiple rotors 400 and multiple stators 500, the rotational torque can be compensated for when the coercivity of the magnet 600 is low.

[0205] In this embodiment, an example was shown in which the stator 500 is the exciter and the rotor 400 is the field element in an axial motor. However, although not specifically shown, an axial motor can also be configured in which the rotor 400 is the exciter and the stator 500 is the field element.

[0206] <Eleventh Embodiment> In the previous embodiments, an example was shown in which the motor 100 rotates. In contrast, the motor 100 in this embodiment is a linear motor that moves in a straight line.

[0207] In the following, in order to explain this embodiment, a new lateral direction LD is defined in addition to the radial direction RD, circumferential direction CD, and axial direction AD. LD is an abbreviation for Lateral Direction. The lateral direction LD is a linear direction perpendicular to the radial direction RD and the axial direction AD.

[0208] The orientation component of orientation OR can be decomposed into three parts by using the newly defined transverse LD instead of the circumferential CD. As shown in Figure 3, orientation OR can be decomposed into three parts: the radial orientation component ORr, the axial orientation component ORa, and the transverse orientation component ORl along the transverse LD.

[0209] The radial direction RD corresponds to the first direction, and the axial direction AD corresponds to the second direction. The radial orientation component ORr corresponds to the first orientation component, and the axial orientation component ORa corresponds to the second orientation component.

[0210] The main difference between a radial motor and a linear motor lies in the motion of the rotor 400. In a radial motor, the rotor 400 rotates in the circumferential direction CD. In contrast, in a linear motor, the rotor 400 moves linearly in the axial direction AD.

[0211] Because of these significant differences, when applying the configuration of a radial motor to the configuration of a linear motor in this embodiment, the circumferential CD characteristics of the radial motor are adapted to the axial AD characteristics of the linear motor.

[0212] To explain in detail regarding orientation OR, the characteristics of the circumferential orientation component ORc of a radial motor are applicable to the characteristics of the axial orientation component ORa of a linear motor. The characteristics of the axial orientation component ORa of a radial motor are applicable to the characteristics of the lateral orientation component ORl of a linear motor. However, the characteristics of the radial orientation component ORr are equivalent for both radial motors and linear motors. The configuration of the motor 100 of this embodiment will be outlined below.

[0213] As shown in Figure 19, the rotor 400 and stator 500 are aligned radially RD across a radial gap. The motor 100 has a linear motion axis 800 instead of a shaft 300. The rotor 400 is connected to this linear motion axis 800. The linear motion axis 800 is movable axially AD relative to the stator 500. In this embodiment, the radial direction RD is perpendicular to the axial direction AD and is the direction in which the rotor 400 and stator 500 are aligned. Therefore, the radial direction RD can also be described as the alignment direction.

[0214] The linear motion axis 800 is flat in a direction perpendicular to the radial direction RD. The extension direction of the linear motion axis 800 is the axial direction AD. The axial width direction of the linear motion axis 800 is the lateral direction LD. The linear motion axis 800 is longer in the lateral direction LD than in the radial direction RD.

[0215] The core support portion 530 of the stator core 510 extends in the axial direction AD. Core teeth 540 are connected to one surface of this core support portion 530 that extends in the axial direction AD. The core teeth 540 extend in the radial direction RD. Multiple core teeth 540 are arranged in the axial direction AD. Stator coils 520 are wound around these multiple core teeth 540.

[0216] The shaft connection portion 420 of the rotor core 410 extends in the axial direction AD. Multiple magnets 600 are provided on one surface of this shaft connection portion 420 that extends in the axial direction AD. The back side is connected to the linear motion shaft 800. The shaft connection portion 420 also functions as a support portion 450. The multiple magnets 600 and the core teeth 540 are aligned radially RD with a radial gap in between.

[0217] Alternatively, a configuration can be adopted in which the rotor core 410 is omitted and multiple magnets 600 are mounted on the linear motion axis 800.

[0218] The multiple magnets 600 are not arc-shaped, but rectangular parallelepipeds. These multiple magnets 600 are arranged in a straight line along the axial direction AD. The upper surface 600c of one of two magnets 600 aligned along the axial direction AD is adjacent to the lower surface 600d of the other magnet 600 along the axial direction AD.

[0219] In this embodiment, an extension magnet 700 is formed by connecting multiple magnets 600 in a straight line. The extension magnet 700 is linear in shape.

[0220] As shown in Figure 19, the multiple orientation ORs contained in one magnet 600 have an axial orientation component ORa. This orientation OR has a radial orientation component ORr instead of a transverse orientation component ORl.

[0221] As explained in detail in the previous embodiments for radial and axial motors, the orientation OR can be varied in various ways in the linear motor of this embodiment as well. For example, multiple orientation ORs may have a lateral orientation component ORl.

[0222] Furthermore, an example is shown in which the rotor 400 and stator 500 extend in the axial direction AD. In this configuration, the motor 100 may take on a cylindrical shape by further extending the rotor 400 and stator 500 in the circumferential direction CD around the axial direction AD. In this configuration, the rotor 400 is provided within the space enclosed by the stator 500. The rotor 400 moves in the axial direction AD within the space enclosed by the stator 500.

[0223] In this embodiment, an example was shown in which the stator 500 is the exciter and the rotor 400 is the field element in a linear motor. However, although not specifically shown, a linear motor can also be configured in which the rotor 400 is the exciter and the stator 500 is the field element.

[0224] <Other Embodiments> The disclosures of this specification are not limited to the exemplary embodiments. The disclosures encompass the exemplary embodiments and variations thereof by those skilled in the art. For example, the disclosures are not limited to the combinations of parts and elements shown in the embodiments, but can be implemented in various variations. The disclosures can be implemented in a variety of combinations. The disclosures may have additional parts that can be added to the embodiments. The disclosures encompass embodiments in which parts and elements have been omitted. The disclosures encompass substitutions or combinations of parts and elements between one embodiment and another. The scope of the disclosed technical field is not limited to the descriptions of the embodiments. The scope of the disclosed technical field is indicated by the claims and should be understood to include all modifications within the meaning and scope equivalent to the claims.

[0225] <Magnet Materials> In the first embodiment, an example was shown in which the magnet 600 includes magnetic powder and other materials. These magnetic powder and other materials can be appropriately selected as long as they satisfy the performance requirements of the motor 100 to which they are applied. The magnet 600 will possess characteristics resulting from the combination of magnetic powder and other materials selected. A magnet 600 with such characteristics will be used in the motor 100. Note that the other materials other than magnetic powder do not necessarily have to be included in the magnet 600. If the motor 100 is a bonded magnet, the other materials other than magnetic powder may be resin materials, etc.

[0226] As the magnetic powder, rare earth magnetic powder containing rare earth elements and rare earth-free magnetic powder not containing rare earth elements can be used. The magnetic powder may contain at least one type of rare earth magnetic powder. The magnetic powder may contain at least one type of rare earth magnetic powder. The magnetic powder may contain at least one type of rare earth magnetic powder and at least one type of rare earth-free magnetic powder.

[0227] When the performance requirements for magnet 600 include miniaturization, weight reduction, and ease of modification, a finer particle size of magnetic powder is preferable. Microscale and nanoscale particle sizes can be used for the magnetic powder. Using such fine magnetic powder increases the design freedom of the orientation OR. When ease of material procurement and high recycling efficiency are required, it is desirable that the composition of the magnetic powder be simple and abundant, and that it does not contain rare earth elements. When it is required to withstand use under harsh conditions, it is desirable that the magnetic powder has high heat resistance and radiation resistance.

[0228] Motor magnets containing magnetic powders exhibiting the characteristics described above—nanoscale, simple and abundant composition, rare-earth-free, high heat resistance, and radiation resistance—are generally expected to possess the properties of such magnetic powders. Therefore, motor magnets containing such magnetic powders are expected to exhibit characteristics such as small size, light weight, ease of modification, easy material procurement, high recycling efficiency, high heat resistance, and radiation resistance. Such motor magnets can be widely used in motors in general. Furthermore, such motor magnets can also be used in motors in specific small-scale technological fields where their characteristics are required.

[0229] Of course, the magnet 600 used in the motor is required to have an output appropriate to its application. The magnetic powder contained in the magnet 600 can be a magnetic powder that is expected to produce an output appropriate to its application.

[0230] Common types of magnets that can be used in Magnet 600 include ceramic magnets such as ferrite magnets, metallic magnets such as rare earth magnets and ordered alloy magnets, and bonded magnets such as rubber magnets and plastic magnets.

[0231] Ferrites include hexagonal ferrites such as barium ferrite and strontium ferrite, and spinel ferrites such as cobalt ferrite. Rare earth elements include R-T systems such as Sm-Co, R-T-B systems such as Nd-Fe-B, and R-T-N systems such as Sm-Fe-N. As for ordered alloys, L1 ０ -FePt, L1 ０- Examples include FeNi, τ-MnAl, etc. Other metallic materials for metal magnets include Alnico and spinodal decomposition systems such as Fe-Cr-Co, Fe １６ N ２ There are. Note that R stands for Rare Earth, and includes Nd, Sm, Dy, etc. T stands for Transition Metal, and includes Fe, Co, Ni, etc.

[0232] <Applications of the motor> At the beginning of the first embodiment, it was shown that the applications of the motor 100 are not particularly limited and that it can be applied to, for example, mobility products, robot products, and equipment that generates energy such as electricity.

[0233] These mobility products include cars as a means of land travel, aircraft as a means of air travel, ships as a means of water travel, submersibles and other vessels as a means of underwater travel, and spacecraft used for travel in outer space.

[0234] These means of transportation on land, air, water, and space include manned and unmanned aircraft. Vehicles include manned and unmanned vehicles. Specifically for the transport of goods, vehicles include manned and unmanned transport vehicles. Unmanned transport vehicles can also be called AGVs. AGV is an abbreviation for Automated Guided Vehicle. Aircraft include manned and unmanned aircraft. Unmanned aircraft can also be called UAVs. UAV is an abbreviation for Unmanned Aerial Vehicle. Specifically for the operation of goods, ships include manned and unmanned ships. Submarines and underwater vehicles include manned and unmanned underwater vehicles. Spacecraft include manned and unmanned spacecraft. Manned spacecraft can also be called spaceships.

[0235] The power sources for these means of transportation, including manned and unmanned aircraft, can include various energy sources such as thermal energy, electrical energy, light energy, renewable energy, chemical energy, and nuclear energy. The power sources for these means of transportation can utilize one or a combination of these various energy sources.

[0236] Robot products, categorized by application, include industrial robots, household robots, service robots, medical robots, educational robots, agricultural robots, exploration robots, and leisure robots.

[0237] One example of an energy-generating facility is a power plant. A power plant is a facility that generates electrical energy using energy sources such as oil, coal, natural gas, biomass, nuclear power, wind power, hydropower, geothermal energy, solar power, and chemical reactions.

[0238] <Disclosure of Technical Ideas> This specification discloses several technical ideas as described in the following paragraphs. Some paragraphs may be written in a multiple dependent form, where subsequent paragraphs optionally refer to preceding paragraphs. Furthermore, some paragraphs may be written in a multiple dependent form, where they refer to other multiple dependent forms. These paragraphs written in multiple dependent forms define several technical ideas.

[0239] <Technical Concept 1> A motor magnet provided on field elements (400, 500) aligned with exciters (500, 400) in a first direction (RD, AD), and having an orientation (OR), wherein the orientation includes a first orientation component (ORr, ORA) along the first direction and a second orientation component (ORc, ORA) intersecting the first direction and along a second direction (CD, AD) in which either the exciters or the field elements move, and comprising: a first magnet section (610) having the first orientation component and the second orientation component; and a second magnet section (640) having the first orientation component opposite to that of the first magnet section in the first direction, and the second orientation component having the same orientation as that of the first magnet section in the second direction. A motor magnet having a connecting portion (620, 630) interposed between the first magnet portion and the second magnet portion in the second direction to connect the first magnet portion and having the same orientation as the first magnet portion in the second direction, wherein in the first magnet portion, the absolute value of the value obtained by dividing the first orientation component by the second orientation component increases as it moves away from the connecting portion in the second direction, and in the second magnet portion, the absolute value of the value obtained by dividing the first orientation component by the second orientation component increases as it moves away from the connecting portion in the second direction, and the magnitude of the first orientation component of the connecting portion is zero.

[0240] <Technical Concept 2> The motor magnet according to Technical Concept 1, wherein the separation distance between the first magnet portion and the second magnet portion via the connecting portion in the second direction is longer than twice the length of the first magnet portion, the second magnet portion, and the connecting portion in the first direction.

[0241] <Technical Idea 3> The motor magnet according to Technical Idea 2, wherein the length of the connecting portion in the second direction is longer than the distance between the first magnet portion and the second magnet portion via the connecting portion in the second direction, minus twice the length of the first magnet portion, the second magnet portion, and the connecting portion in the first direction.

[0242] <Technical Idea 4> The motor magnet according to Technical Idea 3, wherein the length of the connecting portion in the second direction is longer than the length of the first magnet portion, the second magnet portion, and the connecting portion in the first direction.

[0243] <Technical Idea 5> The motor magnet according to any one of Technical Ideas 1 to 4, wherein the first magnet portion, the second magnet portion, and the connecting portion have a first surface (600a, 600c) and a second surface (600b, 600d) aligned in the first direction, the second surface is located closer to the exciter in the first direction than the first surface, the first orientation component of the first magnet portion is directed from the first surface to the second surface in the first direction, the first orientation component of the second magnet portion is directed from the second surface to the first surface in the first direction, and the second orientation component of the first magnet portion, the second magnet portion, and the connecting portion is directed from the second magnet portion to the first magnet portion in the second direction.

[0244] <Technical Idea 6> The motor magnet according to Technical Idea 5, wherein the length of the first magnet portion in the second direction is shorter from the second surface toward the first surface in the first direction, the length of the second magnet portion in the second direction is shorter from the second surface toward the first surface in the first direction, and the length of the connecting portion in the second direction is longer from the second surface toward the first surface in the first direction.

[0245] <Technical Idea 7> A motor magnet according to technical idea 5 or technical idea 6, wherein the side of the first surface of the first magnet portion that is separated from the connecting portion is notched, and the side of the second magnet portion that is separated from the connecting portion that is notched on the first surface portion is notched.

[0246] <Technical Idea 8> A motor magnet according to any one of Technical Ideas 5 to 7, comprising: a first soft magnetic material (650) provided on the second surface side of the first magnet portion, away from the connecting portion; and a second soft magnetic material (660) provided on the second surface side of the second magnet portion, away from the connecting portion.

[0247] <Technical Concept 9> A motor magnet according to any one of Technical Concepts 1 to 8, wherein the first magnet part, the second magnet part, and the connecting part are integrated.

[0248] <Technical Concept 10> A motor magnet according to any one of Technical Concepts 1 to 8, wherein the first magnet part, the second magnet part, and the connecting part are separate components.

[0249] <Technical Concept 11> A field magnet aligned with an exciter (500, 400) in a first direction (RD, AD), comprising an extension magnet (700) that intersects the first direction and extends in a second direction (CD, AD) in which one of the exciter and the field magnet moves, and having orientation, wherein the orientation includes a first orientation component (ORr, ORA) along the first direction and a second orientation component (ORc, ORA) along the second direction, and the extension magnet comprises a first magnet portion (610) having the first orientation component and the second orientation component, and a second magnet portion (640) having the first orientation component opposite to that of the first magnet portion in the first direction, and the second orientation component having the same orientation as that of the first magnet portion in the second direction, A field magnet having a connecting portion (620, 630) interposed between the first magnet portion and the second magnet portion in the second direction, connecting the first magnet portion and the second magnet portion, and having the same orientation as the first magnet portion in the second direction, wherein in the first magnet portion, the absolute value of the value obtained by dividing the first orientation component by the second orientation component increases as it moves away from the connecting portion in the second direction, and in the second magnet portion, the absolute value of the value obtained by dividing the first orientation component by the second orientation component increases as it moves away from the connecting portion in the second direction, and the magnitude of the first orientation component of the connecting portion is zero.

[0250] <Technical Concept 12> A field magnet according to technical concept 11, having a fixing member (440, 450) on which the extension magnet is provided, a part of the extension magnet on the fixing member side is notched, and the fixing member has protrusions (441, 442) provided in the notch of the extension magnet.

[0251] <Technical Concept 13> The device comprises exciters (500, 400) and field elements (400, 500) aligned in a first direction (RD, AD), the field elements include an extension magnet (700) that intersects the first direction and extends in a second direction (CD, AD) in which one of the exciters and the field elements moves, and has orientation, the orientation includes a first orientation component (ORr, ORA) along the first direction and a second orientation component (ORc, ORA) along the second direction, the extension magnet includes a first magnet part (610) having the first orientation component and the second orientation component, and a second magnet part (640) having the first orientation component opposite to that of the first magnet part in the first direction and the second orientation component having the same orientation as that of the first magnet part in the second direction, A motor having a connecting portion (620, 630) interposed between the first magnet portion and the second magnet portion in the second direction to connect the first magnet portion and having the second orientation component which is oriented the same as the first magnet portion in the second direction, wherein in the first magnet portion, the absolute value of the value obtained by dividing the first orientation component by the second orientation component increases as it moves away from the connecting portion in the second direction, and in the second magnet portion, the absolute value of the value obtained by dividing the first orientation component by the second orientation component increases as it moves away from the connecting portion in the second direction, and the magnitude of the first orientation component of the connecting portion is zero.

[0252] <Technical Concept 14> The motor according to technical concept 13, wherein the first direction is the radial direction (RD) perpendicular to the rotation axis (300) on which either the exciter or the field element is provided, and the second direction is the circumferential direction (CD) around the rotation axis.

[0253] <Technical Idea 15> The motor according to technical idea 14, having fixed members (440, 450) positioned opposite the extension magnet in the axial direction (AD) along the rotation axis.

[0254] <Technical Concept 16> The motor according to technical concept 15, wherein the fixing member is made of a non-magnetic material.

[0255] <Technical Idea 17> The motor according to technical idea 15 or technical idea 16, wherein the axial position of the entire area of ​​the fixing member and the axial position of the entire area of ​​the extension magnet are different.

[0256] <Technical Concept 18> The motor according to technical concept 13, wherein the first direction is the axial direction (AD) along the rotation axis (300) on which either the exciter or the field element is provided, and the second direction is the circumferential direction (CD) around the rotation axis.

[0257] <Technical Concept 19> The motor according to technical concept 13, wherein the first direction is the radial direction (RD) perpendicular to the linear motion axis (800) on which either the exciter or the field element is provided, and the second direction is the axial direction (AD) along the linear motion axis.

Claims

A motor magnet provided on field elements (400, 500) aligned with the exciters (500, 400) in a first direction (RD, AD), and having orientation (OR), The orientation includes a first orientation component (ORr, ORA) along the first direction, and a second orientation component (ORc, ORA) along a second direction (CD, AD) that intersects the first direction and in which either the exciter or the field moves. A first magnet portion (610) comprising the first orientation component and the second orientation component, The second magnet portion (640) has a first orientation component that is opposite in the first direction to the first magnet portion, and a second orientation component that is the same orientation as the first magnet portion in the second direction, The device has a connecting portion (620, 630) interposed between the first magnet portion and the second magnet portion in the second direction, connecting the first magnet portion and the second magnet portion, and having the second orientation component which is oriented in the second direction and is the same as the first magnet portion. In the first magnet portion, as it moves away from the connecting portion in the second direction, the absolute value of the first orientation component divided by the second orientation component increases. In the second magnet portion, as it moves away from the connecting portion in the second direction, the absolute value of the first orientation component divided by the second orientation component increases. A motor magnet in which the magnitude of the first orientation component of the connecting portion is zero. 　 The motor magnet according to claim 1, wherein the separation distance between the first magnet portion and the second magnet portion via the connecting portion in the second direction is longer than twice the length of the first magnet portion, the second magnet portion, and the connecting portion in the first direction. 　 The motor magnet according to claim 2, wherein the length of the connecting portion in the second direction is longer than the distance between the first magnet portion and the second magnet portion via the connecting portion in the second direction, minus twice the length of the first magnet portion, the second magnet portion, and the connecting portion in the first direction. 　 The motor magnet according to claim 3, wherein the length of the connecting portion in the second direction is longer than the length of the first magnet portion, the second magnet portion, and the connecting portion in the first direction. 　 The first magnet portion, the second magnet portion, and the connecting portion each have a first surface (600a, 600c) and a second surface (600b, 600d) aligned in the first direction. The second surface is located closer to the exciter in the first direction than the first surface. The first orientation component of the first magnet portion is directed from the first surface to the second surface in the first direction. The first orientation component of the second magnet portion is directed from the second surface to the first surface in the first direction. The motor magnet according to claim 1, wherein the second orientation component of the first magnet portion, the second magnet portion, and the connecting portion is directed from the second magnet portion to the first magnet portion in the second direction. 　 The length of the first magnet portion in the second direction is shorter in the first direction from the second surface toward the first surface. The length of the second magnet portion in the second direction is shorter in the first direction from the second surface toward the first surface. The motor magnet according to claim 5, wherein the length of the connecting portion in the second direction is longer in the first direction from the second surface toward the first surface. 　 The side of the first magnet portion that is separated from the connecting portion on the first surface side is notched. The motor magnet according to claim 5, wherein the side of the second magnet portion that is separated from the connecting portion on the first surface side is notched. 　 A first soft magnetic material (650) is provided on the second surface side of the first magnet portion, away from the connecting portion, The motor magnet according to claim 5, further comprising a second soft magnetic material (660) provided on the second surface side of the second magnet portion, away from the connecting portion. 　 The motor magnet according to any one of claims 1 to 8, wherein the first magnet portion, the second magnet portion, and the connecting portion are integrally formed. 　 The motor magnet according to any one of claims 1 to 8, wherein the first magnet portion, the second magnet portion, and the connecting portion are separate components. 　 A field element aligned with the exciters (500, 400) in the first direction (RD, AD), The system includes an extension magnet (700) that intersects the first direction and extends in a second direction (CD, AD) in which one of the exciter and the field element moves, and which has an orientation. The orientation includes a first orientation component (ORr, ORA) along the first direction and a second orientation component (ORc, ORA) along the second direction. The aforementioned extension magnet is A first magnet portion (610) comprising the first orientation component and the second orientation component, The second magnet portion (640) has a first orientation component that is opposite in the first direction to the first magnet portion, and a second orientation component that is the same orientation as the first magnet portion in the second direction, The device has a connecting portion (620, 630) interposed between the first magnet portion and the second magnet portion in the second direction, connecting the first magnet portion and the second magnet portion, and having the second orientation component which is oriented in the second direction and is the same as the first magnet portion. In the first magnet portion, as it moves away from the connecting portion in the second direction, the absolute value of the first orientation component divided by the second orientation component increases. In the second magnet portion, as it moves away from the connecting portion in the second direction, the absolute value of the first orientation component divided by the second orientation component increases. A field in which the magnitude of the first orientation component of the connecting portion is zero. The fixed members (440, 450) on which the extension magnet is provided are A portion of the extension magnet on the fixing member side is notched, The field magnet according to claim 11, wherein the fixing member has projections (441, 442) provided in the notches of the extension magnet. It comprises exciters (500, 400) and field elements (400, 500) aligned in a first direction (RD, AD), The field element includes an extension magnet (700) that intersects the first direction and extends in a second direction (CD, AD) in which either the exciter or the field element moves, and which has an orientation. The orientation includes a first orientation component (ORr, ORA) along the first direction and a second orientation component (ORc, ORA) along the second direction. The aforementioned extension magnet is A first magnet portion (610) comprising the first orientation component and the second orientation component, The second magnet portion (640) has a first orientation component that is opposite in the first direction to the first magnet portion, and a second orientation component that is the same orientation as the first magnet portion in the second direction, The device has a connecting portion (620, 630) interposed between the first magnet portion and the second magnet portion in the second direction, connecting the first magnet portion and the second magnet portion, and having the second orientation component which is oriented in the second direction and is the same as the first magnet portion. In the first magnet portion, as it moves away from the connecting portion in the second direction, the absolute value of the first orientation component divided by the second orientation component increases. In the second magnet portion, as it moves away from the connecting portion in the second direction, the absolute value of the first orientation component divided by the second orientation component increases. A motor in which the magnitude of the first orientation component of the connecting portion is zero. 　 The first direction is the radial direction (RD) perpendicular to the rotation axis (300) on which either the exciter or the field element is provided. The motor according to claim 13, wherein the second direction is the circumferential direction (CD) around the rotation axis. 　 The motor according to claim 14, further comprising fixing members (440, 450) positioned opposite the extension magnet in the axial direction (AD) along the rotation axis. 　 The motor according to claim 15, wherein the fixing member is made of a non-magnetic material. 　 The motor according to claim 15 or claim 16, wherein the axial position of the entire area of ​​the fixing member and the axial position of the entire area of ​​the extension magnet are different. 　 The first direction is the axial direction (AD) along the rotation axis (300) on which either the exciter or the field element is provided. The motor according to claim 13, wherein the second direction is the circumferential direction (CD) around the rotation axis. 　 The first direction is the radial direction (RD) perpendicular to the linear motion axis (800) on which either the exciter or the field element is provided. The motor according to claim 13, wherein the second direction is the axial direction (AD) along the linear motion axis.

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