Mobile devices, rotating electric machines, and electric aircraft

Abstract

To provide a mobile component that enhances durability while suppressing the increase in weight of the electric motor. [Solution] According to one aspect of the present invention, a moving element for an electric motor that moves in a specific direction of movement is provided, comprising a first magnet and a second magnet arranged adjacent to the first magnet in the direction of movement, wherein the first magnet and the second magnet are in contact with each other, thereby suppressing the movement of the first magnet and the second magnet in a direction intersecting the direction of movement.

Description

Technical Field

[0001] The present invention relates to a mover, a rotating electric machine, and an electric aircraft.

Background Art

[0002] As disclosed in the following documents, a plurality of magnets are arranged adjacent to each other in a mover (rotor) of an electric motor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the prior art, in order to prevent the magnets from moving and scattering as the mover moves, a structure for holding the magnets is required. As a result, the weight of the electric motor increases.

[0005] In view of the above circumstances, the present invention aims to provide a mover with increased durability while suppressing an increase in the weight of the electric motor.

Means for Solving the Problems

[0006] According to one aspect of the present invention, there is provided a mover for an electric motor that moves in a specific moving direction, the mover including a first magnet and a second magnet arranged adjacent to the first magnet in the moving direction, wherein the first magnet and the second magnet are arranged so as to suppress the movement of the first magnet and the second magnet in a direction intersecting the moving direction by contacting each other.

[0007] In this embodiment, since the movement of adjacent first and second magnets is suppressed by their mutual contact, the magnet holding structure in the moving element can be omitted or simplified. As a result, a moving element can be obtained that has increased durability while suppressing an increase in the weight of the electric motor. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic perspective view showing electric aircraft 100. [Figure 2] This is a schematic plan view (viewed from the axial direction) of the rotating electric machine 103. [Figure 3] This is a schematic cross-sectional view along line III-III in Figure 2. [Figure 4] This is a schematic plan view of the permanent magnet section 22 of the first embodiment. [Figure 5] This is a schematic plan view of a modified example of the permanent magnet section 22 shown in Figure 4. [Figure 6] This is a schematic plan view of the permanent magnet section 22 of the second embodiment. [Figure 7] This is a schematic plan view of the permanent magnet section 22 of the third embodiment. [Figure 8] This is a schematic plan view of the permanent magnet section 22 of the fourth embodiment. [Figure 9] This is a schematic plan view of the permanent magnet section 22 of the fifth embodiment. [Figure 10] Figure 9 shows a schematic cross-sectional view along line XX. [Figure 11] This is a schematic plan view of the permanent magnet section 22 of the sixth embodiment. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the drawings. The various features shown in the embodiments below can be combined with each other.

[0010] <Electric aircraft 100> FIG. 1 is a schematic perspective view showing an electric aircraft 100. The electric aircraft 100 includes an aircraft body 101, a plurality of propellers 102, and a plurality of rotary electric machines 103. The electric aircraft 100 may be a manned aircraft or an unmanned aircraft.

[0011] <Aircraft body 101> The aircraft body 101 has a cabin, a frame, etc. The aircraft body 101 houses or holds various devices such as the rotary electric machine 103 and the control box.

[0012] <Propeller 102> The propeller 102 is disposed, for example, at the end of the arm of the aircraft body 101. The number of propellers 102 is not particularly limited.

[0013] <Rotary electric machine 103> The rotary electric machine 103 is a power source for rotating the propeller 102. The rotary electric machine 103 is connected to one propeller 102 one by one.

[0014] FIG. 2 is a schematic plan view (viewed from the axial direction) of the rotary electric machine 103. The rotary electric machine 103 includes a stator 10, a rotor 20, and a shaft 30. The rotor 20 is an example of a mover for an electric motor that moves (i.e., rotates) in a specific moving direction (the rotational direction as a rotor). The rotor 20 rotates with the shaft 30 relative to the stator 10 about the rotation axis P of the shaft 30. The shaft 30 is fixed to the rotor 20 and is connected to the propeller 102. FIG. 3 is a schematic cross-sectional view taken along line III-III of FIG. 2.

[0015] <First Embodiment> Hereinafter, a first embodiment of the rotary electric machine 103 will be described.

[0016] <Stator 10> As shown in FIG. 3, the stator 10 has a stator frame 11 and a winding 12. The stator frame 11 is an iron core that forms a cylinder arranged concentrically with the rotor 20. The winding 12 is wound around the stator frame 11 so as to generate torque in the stator 10 when a polyphase alternating current flows through it, forming a plurality of coils.

[0017] <rotor 20> The rotor 20 has a rotor frame 21 and a permanent magnet portion 22.

[0018] <rotor frame 21> The rotor frame 21 is a non-magnetic body that fixes the permanent magnet portion 22 (holds the first magnet 221 and the second magnet 222 described later). The rotor frame 21 has a magnet holding portion 21A and two end plates 21B. The magnet holding portion 21A is a cylindrical body in which the permanent magnet portion 22 (the first magnet 221 and the second magnet 222) is arranged on the radially outer side, and is fixed to the shaft 30.

[0019] The two end plates 21B are arranged so as to sandwich the permanent magnet portion 22 in the axial direction of the rotor 20. That is, the end plates 21B are arranged so as to cover the first magnet 221 and the second magnet 222 in a direction parallel to the rotation axis of the rotor 20. Further, the end plates 21B are fixed to the magnet holding portion 21A and the shaft 30. The end plates 21B are made of, for example, aluminum, an iron-based material, or the like.

[0020] <permanent magnet portion 22> The permanent magnet portion 22 is arranged on the radially outer side of the magnet holding portion 21A so as to face the stator 10 and the rotor 20 in the radial direction.

[0021] Figure 4 is a schematic plan view of the permanent magnet section 22 of the first embodiment. The thick arrows in Figure 4 indicate the magnetization direction (direction of the magnetic field) of each magnet. As shown in Figure 4, the permanent magnet section 22 has a plurality of first magnets 221 and a plurality of second magnets 222 which are arranged adjacent to the plurality of first magnets 221 in the direction of movement MD (rotation direction) of the rotor 20. Both the first magnets 221 and the second magnets 222 are prismatic permanent magnets that extend in the axial direction of the rotor 20. The first magnets 221 and the second magnets 222 are attached to the magnet holder section 21A by, for example, an adhesive.

[0022] The first magnet 221 and the second magnet 222 have different magnetization directions. Specifically, the permanent magnet section 22 has a Halbach array structure in which a plurality of first magnets 221, which are main pole magnets magnetized in the radial direction, and a plurality of second magnets 222, which are auxiliary pole magnets magnetized in the circumferential direction, are alternately arranged in the direction MD of movement of the rotor 20. More specifically, in the permanent magnet section 22, first magnets 221 with a magnetic field direction from the radially inner to the radially outer direction, second magnets 222 with a magnetic field direction counterclockwise, first magnets 221 with a magnetic field direction from the radially outer to the radially inner direction, and second magnets 222 with a magnetic field direction clockwise are repeatedly arranged in this order in the circumferential direction of the rotor 20. The first magnets 221, which are main pole magnets, have a greater circumferential width than the second magnets 222, which are auxiliary pole magnets. Furthermore, the first magnet 221 and the second magnet 222 are arranged to face each other in the radial direction of the stator 10 and the rotor 20 (see Figure 3).

[0023] The first magnet 221 and the second magnet 222 are arranged to contact each other when the rotor 20 rotates (when the permanent magnet portion 22 moves), thereby suppressing the movement of the first magnet 221 and the second magnet 222 in a direction intersecting the direction of movement of the rotor 20 (typically, the radial direction perpendicular to the direction of movement MD). In this embodiment, at least one of the first magnet 221 and the second magnet 222 is locked to an adjacent magnet (either the first magnet 221 or the second magnet 222) in such a way that its radial movement is restricted, thereby suppressing the radial movement of the first magnet 221 and the second magnet 222. This reduces the manufacturing man-hours required for processing and assembly of the first magnet 221 and the second magnet 222, while suppressing the movement (scattering) of the first magnet 221 and the second magnet 222.

[0024] Specifically, the first magnet 221 and the second magnet 222 each have protrusions 221A and 222A that engage with the adjacent magnet (either the first magnet 221 or the second magnet 222). This allows for a good balance between reducing manufacturing man-hours and suppressing magnet movement.

[0025] In this embodiment, the first magnet 221 has a convex portion 221A and a concave portion 221B. The convex portion 221A of the first magnet 221 protrudes circumferentially toward the adjacent second magnet 222 at the radially outer end of the first magnet 221. The concave portion 221B of the first magnet 221 is a stepped portion (notch) provided at the radially outer end of the first magnet 221 on the opposite side of the convex portion 221A in the circumferential direction. The convex portion 222A of the adjacent second magnet 222 is locked into the concave portion 221B of the first magnet 221. The first magnet 221 has a convex portion in only one direction (i.e., only one convex portion 221A).

[0026] The second magnet 222 has a convex portion 222A and a concave portion 222B. The convex portion 222A of the second magnet 222 protrudes circumferentially toward the adjacent first magnet 221 at the radially outer end of the second magnet 222. The concave portion 222B of the second magnet 222 is a stepped portion (notch) provided at the radially outer end of the second magnet 222 on the opposite side of the convex portion 222A in the circumferential direction. The convex portion 221A of the adjacent first magnet 221 is locked into the concave portion 222B of the second magnet 222. The second magnet 222 has a convex portion in only one direction (i.e., only one convex portion 222A). Note that the protruding direction of the convex portion 221A of the first magnet 221 and the protruding direction of the convex portion 222A of the second magnet 222 are the same (counterclockwise in Figure 4).

[0027] When the rotor 20 rotates, the first magnet 221 suppresses the radial movement of one of the two adjacent second magnets 222 by contacting it (i.e., the engagement of the convex portion 221A with the concave portion 222B), and suppresses its own radial movement by contacting the other second magnet 222 (i.e., the engagement of the convex portion 222A with the concave portion 221B).

[0028] The dimensional tolerance of the magnets used in the rotor 20 is, for example, ±0.1 mm. Therefore, the gap between adjacent first magnets 221 and second magnets 222 is designed to be, for example, in the range of 0.2 mm to 0.4 mm. Accordingly, the protrusions 221A of the first magnet 221 and 222A of the second magnet 222 should each have a protrusion amount (circumferential length) of about 1 mm. In addition, the protrusions 221A of the first magnet 221 and 222A of the second magnet 222 should each have a thickness (radial length) of about 1 mm.

[0029] Figure 5 is a schematic plan view of a modified example of the permanent magnet section 22 of Figure 4. In the permanent magnet section 22 of Figure 5, the convex portion 221A of the first magnet 221 protrudes in an arc shape in plan view toward the adjacent second magnet 222 at the radial central portion of the first magnet 221. The concave portion 221B of the first magnet 221 is a recessed portion (notch) in an arc shape in plan view, located at the radial central portion of the first magnet 221 on the opposite side of the convex portion 221A in the circumferential direction. The convex portion 222A of the adjacent second magnet 222 is locked into the concave portion 221B of the first magnet 221. The convex portion 222A and concave portion 222B of the second magnet 222 have the same shape as the convex portion 221A and concave portion 221B of the first magnet 221, respectively. The protrusion 221A of the adjacent first magnet 221 is locked into the recess 222B of the second magnet 222.

[0030] <Second Embodiment> The following describes a second embodiment of the rotating electric machine 103. The rotating electric machine 103 of the second embodiment is the same as the rotating electric machine 103 of the first embodiment, except for the shapes of the first magnet 221 and the second magnet 222.

[0031] Figure 6 is a schematic plan view of the permanent magnet section 22 of the second embodiment. The dashed line in Figure 6 indicates the radial direction of the rotor 20. In this embodiment as well, the first magnet 221 and the second magnet 222 are arranged to contact each other when the rotor 20 rotates, thereby suppressing the movement of the first magnet 221 and the second magnet 222 in a direction intersecting the direction of movement of the rotor 20. In this embodiment, the first magnet 221 and the second magnet 222 each have tapered surfaces 221C, 221D, 222C, and 222D that intersect both the direction of movement of the rotor 20 (circumferential direction) and the direction perpendicular to that direction of movement (radial direction), and that contact adjacent magnets. As a result, a permanent magnet section 22 can be formed with the first magnet 221 and the second magnet 222 having a simple cross-sectional shape, while suppressing the scattering of magnets.

[0032] Specifically, the first magnet 221 has a first tapered surface 221C facing one of the two adjacent second magnets 222 (the second magnet 222 on the left in Figure 6), and a second tapered surface 221D facing the other of the two adjacent second magnets 222 (the second magnet 222 on the right in Figure 6). The first tapered surface 221C and the second tapered surface 221D are both flat surfaces parallel to the axial direction of the rotor 20 and are non-parallel to each other.

[0033] The second magnet 222 has a first tapered surface 222C facing one of the two adjacent first magnets 221 (the first magnet 221 on the left in Figure 6), and a second tapered surface 222D facing the other of the two adjacent first magnets 221 (the first magnet 221 on the right in Figure 6). The first tapered surface 222C and the second tapered surface 222D are both flat surfaces parallel to the axial direction of the rotor 20 and are parallel to each other.

[0034] In other words, the second magnet 222 has a parallelogram-shaped cross-section (hereinafter referred to as the parallelogram cross-section). The first tapered surface 222C and the second tapered surface 222D of the second magnet 222 constitute two opposing sides of the parallelogram cross-section. This improves the moldability of the second magnet 222 while suppressing the scattering of magnets in the permanent magnet section 22. The parallelogram cross-section of the second magnet 222 is perpendicular to the axial direction of the rotor 20 (i.e., parallel to the radial and circumferential directions of the rotor 20).

[0035] The movement of the first magnet 221 and the second magnet 222 is suppressed by the contact between the first tapered surface 221C of the first magnet 221 and the second tapered surface 222D of the second magnet 222, which is opposite to the first tapered surface 221C, and by the contact between the second tapered surface 221D of the first magnet 221 and the first tapered surface 222C of the second magnet 222, which is opposite to the second tapered surface 221D. Note that the tapered surfaces of the first magnet 221 and the second magnet 222, which are opposite (in contact), are not parallel to each other.

[0036] In the second embodiment, when the rotor 20 rotates, the radial movement of the first magnet 221 and the second magnet 222 is suppressed by the contact between tapered surfaces that intersect the radial direction and are not parallel to each other.

[0037] In this embodiment, the first magnet 221 may have a parallelogram cross-section instead of the second magnet 222. In this case, the two tapered surfaces 222C and 222D of the second magnet 222 are designed to be non-parallel to each other.

[0038] <Third Embodiment> The following describes a third embodiment of the rotating electric machine 103. The rotating electric machine 103 of the third embodiment is the same as the rotating electric machine 103 of the first embodiment, except for the shapes of the first magnet 221 and the second magnet 222.

[0039] Figure 7 is a schematic plan view of the permanent magnet section 22 of the third embodiment. The permanent magnet section 22 in Figure 7 is provided with tapered surfaces on the convex portion 221A and concave portion 221B of the first magnet 221 and the convex portion 222A and concave portion 222B of the second magnet 222 (i.e., a combination of the first and second embodiments).

[0040] Specifically, the convex portion 221A of the first magnet 221 and the convex portion 222A of the second magnet 222 each have a tapered surface on their radially inward side (i.e., a surface that intersects both the circumferential and radial directions). In addition, the concave portion 221B of the first magnet 221 and the concave portion 222B of the second magnet 222 each have a tapered surface on their radially outward side (the surface facing the convex portions 221A and 222A).

[0041] In the third embodiment, when the rotor 20 rotates, the convex portion 221A of the first magnet 221 engages with the recess 222B of the second magnet 222, and the tapered surface of the convex portion 221A and the tapered surface of the recess 222B come into contact. Additionally, the convex portion 222A of the second magnet 222 engages with the recess 221B of the first magnet 221, and the tapered surface of the convex portion 222A and the tapered surface of the recess 221B come into contact, thereby suppressing radial movement of the first magnet 221 and the second magnet 222.

[0042] <Fourth Embodiment> The following describes a fourth embodiment of the rotating electric machine 103. The rotating electric machine 103 of the fourth embodiment is the same as the rotating electric machine 103 of the first embodiment, except for the shapes of the first magnet 221 and the second magnet 222.

[0043] Figure 8 is a schematic plan view of the permanent magnet section 22 of the fourth embodiment. In this embodiment as well, the first magnet 221 and the second magnet 222 are arranged to contact each other when the rotor 20 rotates, thereby suppressing the movement of the first magnet 221 and the second magnet 222 in a direction intersecting the direction of movement of the rotor 20. In this embodiment, only the second magnet 222 is engaged with the adjacent first magnet 221.

[0044] In this embodiment, the second magnet 222 has two protrusions 222A, and the first magnet 221 has two recesses 221B. The first magnet 221 does not have any protrusions that engage with the second magnet 222. The two protrusions 222A of the second magnet 222 each project toward the adjacent first magnet 221 at the radially outer end of the second magnet 222. The projection directions of the two protrusions 222A are both in the circumferential direction of the rotor 20 and are opposite to each other. The two recesses 221B of the first magnet 221 are stepped portions (notches) provided at the two circumferential corners at the radially outer end of the first magnet 221. The two protrusions 222A of the second magnet 222 each engage with the recesses 221B of the adjacent first magnet 221.

[0045] Furthermore, in this embodiment, the rotor 20 has a locking portion 222E provided on the second magnet 222, which serves as a fixing portion for securing the first magnet 221 or the second magnet 222 to the rotor frame 21. Such a fixing portion enhances the suppression effect against radial movement of the first magnet 221 and the second magnet 222 due to centrifugal force.

[0046] The locking portion 222E is provided on the radially inner end of the second magnet 222 and has at least one projection that protrudes in the circumferential direction. In the example of Figure 8, the locking portion 222E has two projections that protrude on both sides in the circumferential direction, but the locking portion 222E may have only one projection. The locking portion 222E locks to the magnet holder 21A in such a way that the radial movement of the second magnet 222 relative to the magnet holder 21A is restricted. This allows the magnet to be mechanically fixed to the magnet holder 21A without the need for additional members. In this embodiment, the locking portion 222E is provided only on the second magnet 222 and not on the first magnet 221.

[0047] In this embodiment, the first magnet 221 may have a locking portion 222E instead of the second magnet 222. However, since it is preferable that the shape of the first magnet 221, which is the main pole magnet, not change due to its characteristics, it is preferable that the locking portion 222E be provided on the second magnet 222. Furthermore, it is preferable that the locking portion 222E be provided on the second magnet 222 from the viewpoint of suppressing the movement of the first magnet 221 in the assembly process in which the first magnet 221 is fixed to the rotor frame 21 first and then the second magnet 222 is fixed.

[0048] Furthermore, in the permanent magnet section 22 of the first embodiment (Figures 4 and 5), the second embodiment (Figure 6), or the third embodiment (Figure 7), a locking portion 222E may be provided on the first magnet 221 or the second magnet 222. In other words, the fixing portion (locking portion 222E) of this embodiment can be combined with any embodiment.

[0049] <Fifth Embodiment> The following describes a fifth embodiment of the rotating electric machine 103. The rotating electric machine 103 of the fifth embodiment is the same as the rotating electric machine 103 of the first embodiment, except for the shapes of the first magnet 221 and the second magnet 222.

[0050] Figure 9 is a schematic plan view of the permanent magnet section 22 of the fifth embodiment. In this embodiment, the rotor 20 of the first embodiment (Figure 4) is provided with a pin 23 that connects the second magnet 222 and the rotor frame 21 in a direction parallel to the rotation axis of the rotor 20 (axial direction), serving as a fixing part for fixing the first magnet 221 or the second magnet 222 to the rotor frame 21. This makes it possible to add a fixing part to the rotor 20 while maintaining the shape of the first magnet 221 and the second magnet 222 to suppress the scattering of magnets.

[0051] Figure 10 is a schematic cross-sectional view along line XX in Figure 9. The pin 23 is a rod-shaped member extending in the axial direction of the rotor 20 and is inserted through a through hole provided in the central part of the second magnet 222 in a plan view (i.e., the radial and circumferential center). One pin 23 is inserted into each of the multiple second magnets 222.

[0052] One end of the pin 23 is connected to one of the two end plates 21B, and the other end of the pin 23 is connected to the other of the two end plates 21B. In other words, the pin 23 (fixing part) connects the second magnet 222 to the end plate 21B. This allows the second magnet 222 to be coupled to the shaft 30 via the pin 23 and the end plate 21B, thereby enhancing the effect of suppressing the movement of the first magnet 221 and the second magnet 222. The pin 23 is fixed to the end plate 21B by, for example, press-fitting, crimping, welding, etc.

[0053] The material of the pin 23 is preferably a lightweight material that does not affect the magnetic field of the permanent magnet part 22 and has a predetermined strength. For example, aluminum, high heat-resistant engineering plastics, etc., can be used. The shape of the pin 23 may be cylindrical or rectangular (for example, a square prism). The diameter of the pin 23 is, for example, about 1 mm.

[0054] In this embodiment, the pin 23 may be inserted through the first magnet 221 instead of the second magnet 222. However, as mentioned above, since it is preferable not to change the shape of the first magnet 221, which is the main pole magnet, it is preferable to insert the pin 23 through the second magnet 222. Furthermore, inserting the pin 23 through the second magnet 222 is preferable from the viewpoint of suppressing the movement of the first magnet 221 during the assembly process in which the first magnet 221 is fixed to the rotor frame 21 before the second magnet 222.

[0055] Furthermore, although the pin 23 is combined with the permanent magnet part 22 of the first embodiment (Figure 4) in Figure 9, the pin 23 may also be combined with the permanent magnet part 22 of the second embodiment (Figure 6) or the third embodiment (Figure 7). In other words, the fixing part (pin 23) of this embodiment can be combined with any embodiment.

[0056] <Sixth Embodiment> The following describes a sixth embodiment of the rotating electric machine 103. The rotating electric machine 103 of the sixth embodiment is the same as the rotating electric machine 103 of the first embodiment, except for the shapes of the first magnet 221 and the second magnet 222.

[0057] Figure 11 is a schematic plan view of the permanent magnet section 22 of the sixth embodiment. In this embodiment, a wire 223 is added to the rotor 20 of the first embodiment (Figure 4), which is stretched between the adjacent first magnet 221 and second magnet 222. This enhances the effect of suppressing the scattering of magnets.

[0058] The wire 223 is stretched between a groove 221F provided in the first magnet 221 and a groove 222F provided in the second magnet 222. The groove 221F of the first magnet 221 is a recess provided one at a time near the radially inner end of the face of the first magnet 221 facing the second magnet 222, and one at a time near the radially outer end of the face of the first magnet 221 facing another second magnet 222. The groove 222F of the second magnet 222 is a recess provided one at a time near the radially inner end of the face of the second magnet 222 facing the first magnet 221 (the face on which the groove 221F is provided on the radially outer side), and one at a time near the radially outer end of the face of the second magnet 222 facing another first magnet 221 (the face on which the groove 221F is provided on the radially inner side). The grooves 221F of the first magnet 221 and 222F of the second magnet 222 extend in the axial direction of the rotor 20.

[0059] The wire 223 is wound around the radially inner groove 221F of the first magnet 221 and the radially outer groove 222F of the second magnet 222, which is adjacent to the first magnet 221 on the opposite side of groove 221F. The wire 223 is also wound around the radially inner groove 222F of the second magnet 222 and the radially outer groove 221F of the first magnet 221, which is adjacent to the second magnet 222 on the opposite side of groove 222F.

[0060] Wire 223 is positioned one at a time for each pair of adjacent first magnets 221 and second magnets 222. In a plan view, wire 223 extends in a direction that intersects both the radial and circumferential directions of the rotor 20. Wire 223 also extends axially along the grooves 221F of the first magnet 221 and the grooves 222F of the second magnet 222. For example, carbon fiber, glass fiber, etc., can be used as the material for wire 223.

[0061] In Figure 11, the wire 223 is added to the permanent magnet section 22 of the first embodiment (Figure 4), but the wire 223 may also be added to the permanent magnet section 22 of the second embodiment (Figure 6) or the third embodiment (Figure 7). In other words, the wire 223 of this embodiment can be combined with any embodiment.

[0062] 4. Effect Since the movement of adjacent first magnets 221 and second magnets 222 is suppressed by their contact with each other, the magnet holding structure in the moving element (rotor 20) can be omitted or simplified. As a result, a moving element with increased durability can be obtained while suppressing an increase in the weight of the electric motor (rotating electric machine 103).

[0063] Although embodiments of the present invention have been described above, the present invention is not limited thereto and can be modified as appropriate without departing from the technical spirit of the invention.

[0064] 5. Other The moving element of the present invention is not limited to a rotor that rotates. The present invention also includes, for example, a moving element that moves linearly, and an electric motor equipped with such a moving element.

[0065] The product may be provided in any of the following embodiments.

[0066] (1) A moving element for an electric motor that moves in a specific direction of movement, comprising a first magnet and a second magnet positioned adjacent to the first magnet in the direction of movement, wherein the first magnet and the second magnet are in contact with each other to suppress the movement of the first magnet and the second magnet in a direction intersecting the direction of movement.

[0067] (2) A movable device as described in (1) above, wherein at least one of the first magnet and the second magnet is locked to an adjacent magnet.

[0068] (3) A movable element as described in (2) above, wherein the first magnet and the second magnet each have a protrusion that engages with an adjacent magnet.

[0069] (4) A movable element according to any one of (1) to (3) above, wherein the first magnet and the second magnet each have tapered surfaces that intersect both the direction of movement and the direction perpendicular to the direction of movement, and that contact adjacent magnets.

[0070] (5) A movable magnet as described in (4) above, wherein one of the first magnet and the second magnet has a parallelogram-shaped cross-section, and the tapered surface of the magnet having the cross-section among the first magnet and the second magnet constitutes two opposing sides of the cross-section.

[0071] (6) A movable device according to any one of (1) to (5) above, further comprising a frame for holding the first magnet and the second magnet, and a fixing part for fixing the first magnet or the second magnet to the frame.

[0072] (7) A movable element as described in (6) above, wherein the direction of movement is the direction of rotation as a rotor, the frame has a cylindrical magnet holding portion in which the first magnet and the second magnet are arranged radially outward, and the fixing portion is a locking portion provided on the first magnet or the second magnet and engaging with the magnet holding portion.

[0073] (8) A movable element according to (6) or (7) above, wherein the direction of movement is the direction of rotation as a rotor, and the fixing part is a pin that connects the first magnet or the second magnet and the frame in a direction parallel to the rotation axis of the rotor.

[0074] (9) A movable element according to any one of (6) to (8) above, wherein the direction of movement is the direction of rotation as a rotor, the frame has end plates arranged to cover the first magnet and the second magnet in a direction parallel to the rotation axis of the rotor, and the fixing part connects the first magnet or the second magnet to the end plate.

[0075] (10) A moving device according to any one of (1) to (9) above, wherein the first magnet and the second magnet have different magnetization directions.

[0076] (11) A rotating electric machine comprising: a stator having windings; a moving element according to any one of (1) to (10) above, arranged such that the stator faces the first magnet and the second magnet; and a shaft fixed to the moving element, wherein the moving element comprises: a non-magnetic frame for fixing the first magnet and the second magnet; and a magnet section in a Halbach arrangement in which a plurality of main pole magnets as the first magnet, which are radially magnetized, and a plurality of auxiliary pole magnets as the second magnet, which are circumferentially magnetized, are arranged alternately.

[0077] (12) An electric aircraft equipped with a mobile component as described in any one of (1) to (10) above, or a rotating electric machine as described in (11). Of course, this is not always the case.

[0078] Finally, while various embodiments relating to this disclosure have been described, these are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be implemented in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents. [Explanation of Symbols]

[0079] 10: Status 11: Stator frame 12: Winding 20: Rotor 21: Rotor frame 21A: Magnet holding part 21B: End plate 22: Permanent magnet section 23: Pin 30: Shaft 100:Electric aircraft 101: Aircraft body 102: Propeller 103: Rotating Electric Machine 221: First magnet 221A: Convex part 221B: Recess 221C: First tapered surface 221D: Second tapered surface 221F: Groove 222: Second magnet 222A: Convex part 222B: Recess 222C: First tapered surface 222D: Second tapered surface 222E: Locking part 222F: Groove 223: Wire MD:Moving direction P: Rotation axis

Claims

1. A moving element for an electric motor that moves in a specific direction, The first magnet and, A second magnet is positioned adjacent to the first magnet in the aforementioned direction of movement, Equipped with, A moving element in which the first magnet and the second magnet are in contact with each other, thereby suppressing the movement of the first magnet and the second magnet in a direction intersecting the direction of movement.

2. In the movable part according to claim 1, A movable element in which at least one of the first magnet and the second magnet engages with an adjacent magnet.

3. In the mobile device according to claim 2, The first magnet and the second magnet are movable elements, each having a protrusion that engages with an adjacent magnet.

4. In the movable part according to claim 1, The first magnet and the second magnet each have tapered surfaces that intersect both the direction of movement and the direction perpendicular to the direction of movement, and that contact adjacent magnets.

5. In the movable part according to claim 4, One of the first magnet and the second magnet has a parallelogram-shaped cross-section. The tapered surface of the magnet having the cross-section among the first and second magnets constitutes two opposing sides of the cross-section, forming a movable element.

6. In the movable part according to claim 1, A frame that holds the first magnet and the second magnet, A fixing part for fixing the first magnet or the second magnet to the frame, A mobile child that is equipped with even more features.

7. In the movable part according to claim 6, The aforementioned direction of movement is the direction of rotation as a rotor. The frame has a cylindrical magnet holder portion in which the first magnet and the second magnet are arranged radially outward. The fixing portion is a movable part that is provided on the first magnet or the second magnet and engages with the magnet holding portion.

8. In the movable part according to claim 6, The aforementioned direction of movement is the direction of rotation as a rotor. The fixed portion is a movable element, which is a pin that connects the first magnet or the second magnet to the frame in a direction parallel to the rotation axis of the rotor.

9. In the movable part according to claim 6, The aforementioned direction of movement is the direction of rotation as a rotor. The frame has end plates arranged to cover the first magnet and the second magnet in a direction parallel to the rotation axis of the rotor, The fixing part is a movable element that connects the first magnet or the second magnet to the end plate.

10. In the movable part according to claim 1, The first magnet and the second magnet are movable elements with different magnetization directions relative to each other.

11. It is a rotating electric machine, A stator having windings, The movable element according to claim 1, wherein the stator and the first magnet and the second magnet are arranged to face each other, A shaft fixed to the aforementioned movable element, Equipped with, The aforementioned mobile unit is A non-magnetic frame for fixing the first magnet and the second magnet, A magnet section in a Halbach arrangement in which a plurality of main pole magnets, which are magnetized radially, and a plurality of auxiliary pole magnets, which are magnetized circumferentially, are arranged alternately, A rotating electric machine.

12. An electric aircraft comprising a mobile element according to any one of claims 1 to 10, or a rotating electric machine according to claim 11.

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