Stator assembly, axial direction magnetic flux motor including the same, and mobility device equipped with the same

Abstract

To provide an axial direction magnetic flux motor capable of generating large torque by making a simple structural change.SOLUTION: A stator assembly 10 of an axial direction magnetic flux motor includes a plurality of cores 11 disposed repeatedly in the circumferential direction, and coils 15 disposed on the cores. Both ends of the core include pole shoes each having an expanded outer diameter. One of the pole shoes is a fixed pole shoe that is integrally disposed with the core, and the other one can be fastened and connected.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a stator assembly, an axial flux motor including the same, and a mobility device including the same. [Background technology]

[0002] Generally, electric motors can be classified into DC motors and AC motors depending on the power source used, and can be classified into AFPM (Axial Flux Permanent Magnet) motors and RFPM (Radial Flux Permanent Magnet) motors depending on the direction of magnetic flux.

[0003] AFPM motors are being researched extensively because they have higher torque and efficiency than RFPM motors, as they can utilize more concentrated magnetic flux.

[0004] Such motors are mainly composed of a stator that is fixed to a housing or casing and has coils wound around it so that a rotating magnetic field is formed when power is applied, and a rotor that is rotatably mounted inside the stator by a shaft, and is configured so that the magnetic flux generated by the stator interacts with the rotor, generating rotational torque.

[0005] Meanwhile, recently, research and development into various mobility devices has accelerated, and the demand for electric motors has also increased significantly. Electric motors used as drive sources for electric vehicles are typically high-speed and high-power electric motors.

[0006] Mobility devices, including hybrid electric vehicles and air mobility, are partially or completely driven by motors rather than conventional internal combustion engines. Interior Permanent Magnet Synchronous Motors (IPMSMs), which use permanent magnets, are widely used as motors for such mobility devices. IPMSMs are characterized by high efficiency and output. However, AFPM motors have higher torque and efficiency because they can utilize a concentrated magnetic flux compared to RFPM motors, and have recently been the subject of much research.

[0007] However, conventional motors have limitations on how much output they can increase, making it difficult to meet the requirements of increasingly high-performance mobility devices. In order to concentrate the magnetic flux, the core must be three-dimensional rather than two-dimensional, but this is not possible with the automated core manufacturing methods used in existing RFPM motors.

[0008] AFPM motors are capable of utilizing three-dimensional magnetic flux, but applying a lamination core made by stacking existing electrical steel sheets makes the manufacturing process extremely difficult. Therefore, much research is being conducted into applying soft magnetic powder cores (SMC) to ensure freedom of shape, even if the electrical conversion efficiency is low. Summary of the Invention [Problem to be solved by the invention]

[0009] In order to solve at least some of the above problems, the present invention aims to provide a motor structure that can generate large torque by simply modifying the core structure of an axial flux motor.

[0010] The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description. [Means for solving the problem]

[0011] To achieve the above object, a stator assembly of an axial flux motor according to one embodiment of the present invention includes a plurality of cores arranged repeatedly in a circumferential direction and coils arranged on the cores, the cores having pole shoes with expanded outer diameters at both ends, one of the pole shoes being a fixed pole shoe that is integral with the core, and the other pole shoe being capable of being fastened to the core.

[0012] In addition, the core and the fastening pole shoe can be slidably coupled.

[0013] Also, one of the core and the fastening pole shoe may be provided with a fastening groove, and the other may be provided with a fastening protrusion.

[0014] In addition, the fastening groove and the fastening protrusion may have a length in a radial direction, and the fastening protrusion may be slidably fitted into the fastening groove in a radial direction.

[0015] In addition, the fastening groove and the fastening protrusion may have the same shape, and the coupling tolerance between the fastening groove and the fastening protrusion may be 0.1 mm or less.

[0016] Also, a bond may be applied between the fastening groove and the fastening protrusion.

[0017] In addition, the fastening protrusion may include a main body protrusion extending axially from the core or the fastening pole shoe, and the axial middle portion of the main body protrusion may be provided with a fastening groove that is thinner than other portions.

[0018] In addition, the fastening groove may have a main body groove in the axial direction in the core or the fastening pole shoe on the surface where the core and the fastening pole shoe face each other, and the main body groove may have a fastening protrusion that protrudes inward in the middle part in the axial direction.

[0019] Also, the fastening protrusion may be provided in a linear shape with a constant width.

[0020] In addition, the fastening protrusions may have a shape in which the width increases as they extend radially outward.

[0021] The pole shoe may have a structure in which its outer diameter is larger than that of the core in all directions.

[0022] To achieve the above object, an axial magnetic flux motor according to one embodiment of the present invention includes a stator including a plurality of cores arranged repeatedly in a circumferential direction and coils arranged in the cores, and a rotor including a magnetic body facing the stator in the axial direction and fixed to a rotating shaft, wherein the core has pole shoes with expanded outer diameters at both ends, and one of the pole shoes may be a fixed pole shoe arranged integrally with the core, and the other may be a pole shoe fastened and connected to the core.

[0023] In addition, one of the core and the fastening pole shoe may have a fastening groove and the other may have a fastening protrusion, so that the core and the fastening pole shoe can be slidably coupled to each other.

[0024] In addition, the coupling tolerance between the fastening groove and the fastening protrusion may be 0.1 mm or less.

[0025] Also, a bond may be applied between the fastening groove and the fastening protrusion.

[0026] To achieve the above object, a mobility device according to one embodiment of the present invention may include a main body, at least one driving means provided in the main body, a battery provided in the main body, and an axial flux motor according to one embodiment connected to the battery and providing driving force to the at least one driving means. [Effects of the Invention]

[0027] A motor according to one embodiment of the present invention can generate even greater torque through simple structural modifications to an axial flux motor.

[0028] The motor of one embodiment of the present invention can be realized by simple structural changes, so there is no significant modification compared to the prior art, and performance is improved, which has the effect of substantially reducing costs.

[0029] The effects of the present invention are not limited to those described above, and other effects not mentioned here will be clearly recognized by those skilled in the art from the following description. [Brief explanation of the drawings]

[0030] [Figure 1] 1 is a cross-sectional view of an axial flux motor according to an embodiment of the present invention. [Figure 2] 1 is a perspective view showing a stator and a rotor of an axial flux motor according to an embodiment of the present invention; [Figure 3] 1 is a cutaway perspective view showing a stator and a rotor of an axial flux motor according to an embodiment of the present invention; [Figure 4] FIG. 4 is a cutaway perspective view showing only the core of the stator, excluding the coils of the stator, in FIG. [Figure 5] 1 is an exploded perspective view of a stator core and coils of an axial flux motor according to an embodiment of the present invention. [Figure 6] 1 is a perspective view of a stator core of an axial flux motor according to an embodiment of the present invention; [Figure 7a] 1 is an exploded perspective view of a stator core of an axial flux motor according to an embodiment of the present invention. [Figure 7b] 1 is an exploded perspective view of a stator core of an axial flux motor according to an embodiment of the present invention. [Figure 8a] FIG. 10 is an exploded perspective view of a stator core of an axial flux motor according to another embodiment of the present invention. [Figure 8b] FIG. 10 is an exploded perspective view of a stator core of an axial flux motor according to another embodiment of the present invention. [Figure 9]10 is a table showing test results comparing the torque and other performance of an axial flux motor equipped with a stator core c according to one embodiment of the present invention with that of an axial flux motor having stator cores a and b of other structures (comparative embodiments). [Figure 10] 1 is a perspective view showing an example of a mobility device to which a motor according to an embodiment of the present invention is applied; [Figure 11a] 1 is a perspective view showing an example of a mobility device to which a motor according to an embodiment of the present invention is applied; [Figure 11b] 1 is a perspective view showing an example of a mobility device to which a motor according to an embodiment of the present invention is applied; DETAILED DESCRIPTION OF THE INVENTION

[0031] Since the present invention can be modified in various ways and can have various embodiments, specific embodiments are shown in the drawings and will be described in detail. However, this is not intended to limit the present invention to the specific embodiments, and it should be understood that the present invention includes all modifications, equivalents, and alternatives that fall within the spirit and technical scope of the present invention.

[0032] Terms such as "first," "second," etc. may be used to describe various components, but the components should not be limited by these terms. These terms are used only to distinguish one component from another. For example, a first component may be termed a "second component," and similarly, a second component may be termed a "first component," without departing from the scope of the present invention. The term "and / or" includes a combination of multiple associated listed items or any of multiple associated listed items.

[0033] The terms "section, part, portion, etc." may be used to describe various components, but the components should not be limited by these terms. These terms may refer not only to components that are physically / visibly separated, but also to terms that describe the function or configuration of the part even if the division / division is not clear.

[0034] The terms used in this application are merely used to describe specific embodiments and are not intended to limit the present invention. The singular expressions include the plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described herein, and should be understood as not precluding the possibility of the presence or addition of one or more features, numbers, steps, operations, components, parts, or combinations thereof.

[0035] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which this invention pertains. Terms as defined in commonly used dictionaries should be interpreted as having a meaning consistent with the contextual meaning of the relevant art, and should not be interpreted as having an ideal or overly formal meaning unless expressly defined in this application.

[0036] In this specification, a mobility device can move in a space related to land, underground, air, space, sea, and / or underwater, depending on the space it moves in. A land or underground mobility device can be provided in the form of, for example, a vehicle, a robot, etc., and an air or space mobility device can be air mobility, such as a conventional fixed-wing or rotary-wing aircraft, advanced air mobility (AAM), which has been actively developed recently, an unmanned aerial vehicle or drone, a rocket, or a satellite-mounted mobility device. A sea or underwater mobility device can be, for example, a ship, a submarine, etc. A mobility device is not limited to a specific space and can be a mobile body capable of moving in all of the above spaces, i.e., a mobile body capable of moving between multiple spaces, such as an amphibious vehicle or a flying vehicle.

[0037] In the following description, terms used in relation to directions, such as "forward," "rearward," "side," "front," "rear," "upper," "upper part," "lower," "lower part," "left and right," etc., are defined relative to the vehicle or vehicle body. Furthermore, terms such as "first" and "second" may be used to describe various components, but these components are not limited in order, size, position, or importance by terms such as "first" and "second," and are named only to distinguish one component from another.

[0038] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings.

[0039] A motor includes a stator and a rotor, and the rotor rotates due to electromagnetic interaction between the stator and rotor. As mentioned above, motors can be classified into AFPM (Axial Flux Permanent Magnet) motors and RFPM (Radial Flux Permanent Magnet) motors depending on the direction of the magnetic flux.

[0040] AFPM motors are being researched extensively because they have higher torque and efficiency than RFPM motors, as they can utilize more concentrated magnetic flux.

[0041] 1 to 4, an axial flux motor 100 according to an embodiment of the present invention may include a stator assembly 10 that generates a magnetic flux to form a rotating field, and a rotor assembly 20 that includes magnetic materials that interact with each other in the rotating field and is driven to rotate. The axial flux motor 100 may also include housings 30-31, 32 that accommodate the stator assembly 10 and the rotor assembly 20.

[0042] The axial flux motor 100 of this embodiment may include a stator 10 including a plurality of cores 11 repeatedly provided in the circumferential direction and coils 15 provided on the cores 11, and a rotor 20 including a magnetic body 15 axially facing the stator 10 and fixed to a rotating shaft 21. The core 11 has pole shoes 12, 14 with expanded outer diameters at both ends, and one of the pole shoes 12, 14 may be a fixed pole shoe 12 provided integrally with the core 11, and the other may be a fastening pole shoe 14 fastened and coupled thereto.

[0043] The stator assembly 10 may include a plurality of cores 11 repeatedly provided in the circumferential direction and coils 15 provided on the cores 11. The core 11 has a pair of pole shoes 12, 14 with expanded outer diameters at both ends, and one of the pair of pole shoes may be a fixed pole shoe 12 provided integrally with the core 11, and the other may be a fastening pole shoe 14 fastened and coupled to the core 11.

[0044] The stator assembly 10 may include a stator core 11 and a stator coil 15. The stator core 11 fixes or supports the wound coil 15 and provides a path for magnetic flux generated by interaction between the stator assembly 10 and the rotor assembly 20. The stator core 11 is disposed inside the housing 30 and may be in the form of a ring or an annulus.

[0045] The stator coil 15 is wound around the stator core 11. The stator coil 15 is connected to a power supply and can receive current, thereby generating a magnetic flux that interacts with the rotor assembly 20.

[0046] On the other hand, the rotor assembly 20 can include a rotating shaft 21, a rotating plate 22, a rotor core 23, and a magnetic body 24.

[0047] The rotating shaft 21 is rotatably mounted within the housing 30. The rotating shaft 21 can rotate around a rotation axis in the longitudinal direction, and the front and rear sides in the longitudinal direction can be rotationally supported by bearings (not shown).

[0048] The rotating plate 22 is fastened to the rotating shaft 21 and transmits the rotational force generated by the rotor core 23 and the magnetic body 24 to the rotating shaft 21. The rotating plate 22 may be formed in the form of a circular plate or a disk with the rotating shaft 21 fastened to its center.

[0049] The rotating plates 22 may be arranged such that a pair of rotating plates 22-22a, 22b face each other with the stator assembly 10 sandwiched therebetween.

[0050] The rotor core 23 is attached to the rotating plate 22. The rotor core 23 corresponds to the stator core 11 described above, and fixes or supports the magnetic material 24 that generates a rotational force, and provides a path for the magnetic flux generated by the interaction between the stator assembly 10 and the rotor assembly 20.

[0051] The rotor core 23 may be formed in the shape of a disk or a disc, which corresponds to the stator core 11 arranged in the shape of an annulus or a ring. The rotor core 23 may also be arranged such that a pair of rotor cores 23-23a, 23b face each other with the stator assembly 10 sandwiched therebetween.

[0052] Magnetic bodies 24-24a, 24b are attached to rotor core 23. Magnetic body 24 may be formed of a permanent magnet, and generates a rotational force by interacting with the rotating magnetic field formed via stator coil 15. The rotational force is transmitted to rotating shaft 21 via rotating plate 22, causing rotating shaft 21 to rotate.

[0053] The housing 30 has a predetermined mounting space therein and can accommodate the stator assembly 10 and the rotor assembly 20 .

[0054] The housing 30 may include a stator housing 31 that fixedly supports the stator assembly 10 within the housing 30, and a rotor housing 32 that rotatably supports the rotary shaft 21 of the rotor assembly 20. The housing 30 may be formed in a plurality of divided parts that are assembled together, or may be formed as a single unit. The axial flux motor 100 may further include a sensing unit (not shown) that senses the rotation and degree (speed) of the rotor assembly 20.

[0055] 5 to 7, a stator assembly 10 provided in an axial flux motor 100 according to an embodiment may include a plurality of cores 11 repeatedly provided in the circumferential direction and coils 15 provided on the cores 11. The core 11 has a pair of pole shoes 12, 14 with expanded outer diameters at both ends, and one of the pair of pole shoes may be a fixed pole shoe 12 provided integrally with the core 11, and the other may be a fastening pole shoe 14 fastened and coupled to the core 11.

[0056] The core 11 provided in one embodiment of the axial magnetic flux motor 100 has a pair of pole shoes 12, 14 whose outer diameters are expanded at both ends, one of which can be a fixed pole shoe 12 that is provided integrally with the core 11, and the other can be a fastening pole shoe 14 that is manufactured separately and fastened together.

[0057] The pole shoes 12, 14 may have a structure in which the outer diameter thereof is larger than that of the core 11 in all directions.

[0058] Hereinafter, for convenience of explanation of the invention, the axial direction is defined as the direction in which the rotating shaft 21 extends, the radial direction is defined as the direction perpendicular to the axial direction, and the circumferential direction is defined as the direction in which the rotor assembly 20 rotates. Note that the inner radial direction can refer to the direction toward the rotating shaft, and the outer radial direction can refer to the opposite direction, that is, the direction from the rotating shaft toward the outside.

[0059] The core 11 is provided with a fixed pole shoe 12 and a fastening pole shoe 14 at both axial ends. A plurality of cores 11 may be provided repeatedly in the circumferential direction, and each of these may be provided with a fixed pole shoe 12 and a fastening pole shoe 14 at both axial ends. However, the cores 11 provided repeatedly in the circumferential direction may be arranged so that the positions of the fixed pole shoe 12 and the fastening pole shoe 14 are consistent.

[0060] For example, the fixed pole shoes 12 provided on all cores 11 can be arranged on the lower side in the axial direction, and conversely, the fastening pole shoes 14 can all be arranged on the upper side in the axial direction. Of course, the opposite can also be true, with all fixed pole shoes 12 arranged on the upper side in the axial direction and all fastening pole shoes 14 arranged on the lower side in the axial direction.

[0061] In addition, the fixed pole shoes 12 and the fastening pole shoes 14 provided on the cores 11 repeatedly arranged in the circumferential direction can be arranged so that they alternately face each other above and below in the axial direction as they move in the circumferential direction.

[0062] The core 11 and the fastening pole shoe 14 can be manufactured separately and slidably coupled to each other. To this end, one of the core 11 and the fastening pole shoe 14 can be provided with a fastening groove S1, and the other can be provided with a fastening protrusion P1. The fastening groove S1 and the fastening protrusion P1 have a length in the radial direction, which is the length direction of the core 11, and the fastening protrusion P1 can be slidably fitted into the fastening groove S1 in the radial direction.

[0063] Meanwhile, as shown in Figure 7a, the core 11 and the fastening pole shoe 14 may have a circumferential thickness that increases radially outward due to the characteristics of the core 11, which is arranged repeatedly in the circumferential direction and has a generally round shape. Therefore, the fastening protrusion P1 may also have a circumferential thickness (width) that increases radially. As a result, the fastening groove S1 may also have a circumferential width that increases radially. In this structure, the fastening pole shoe 14 may be slidably fitted into the core 11 while moving from the inside to the outside radially.

[0064] 7b, even if the core 11 and the fastening pole shoe 14 have a shape in which the thickness (width) in the circumferential direction increases as they move in the radial direction, the fastening protrusions P1 and the fastening grooves S1 can be provided linearly in the radial direction so that the width is constant. In this case, the fastening direction does not need to be considered, which further improves the ease of assembly.

[0065] Meanwhile, the fastening groove S1 and the fastening protrusion P1 have the same shape, and the fitting tolerance between the fastening groove S1 and the fastening protrusion P1 may be 0.1 mm or less, so that the fastening protrusion P1 can be fitted, coupled, and fixed to the fastening groove S1 substantially without any additional media.

[0066] However, in order to improve the bonding strength, a bond may be applied between the fastening groove S1 and the fastening projection P1 for further fixing (bonding).

[0067] Meanwhile, the fastening protrusion P1 has a main body protrusion 11a extending in the axial direction from the core 11, and the axial middle portion of the main body protrusion 111a can have a fastening groove 11b that is thinner than other portions.The fastening groove S1 has a main body groove 14a in the fastening pole shoe 14 in the axial direction on the surface where the core 11 and the fastening pole shoe 14 face each other, and the main body groove 14a can have a fastening protrusion 14b that protrudes inward in the axial middle portion.

[0068] As a result, when the main body protrusion 11a is slidably fitted along the main body groove 14a, the fastening protrusion 14b is fitted into the fastening recessed groove 11b, and these can be firmly joined (fastened).

[0069] 8a and 8b, the core 11 may be provided with a fastening groove S2 and the fastening pole shoe 14 may be provided with a fastening protrusion P2, which is the opposite of the embodiment described above. In this case, the fastening pole shoe 14 may be provided with a main body protrusion 14c extending in the axial direction, and the axially intermediate portion of the main body protrusion 14c may be provided with a fastening recessed groove 14d that is thinner than the other portions. The core 11 may be provided with a main body groove 11c, and the main body groove 11c may be provided with a fastening protrusion 11d that protrudes inward in the axially intermediate portion.

[0070] On the other hand, as shown in Figures 8a and 8b, even when the core 11 has a fastening groove S2 and the fastening pole shoe 14 has a fastening protrusion P2, the fastening protrusion P2 and the fastening groove S2 can be formed in a widening shape or in a straight line.

[0071] As shown in Figure 8a, the core 11 and the fastening pole shoe 14 may have a circumferential thickness that is greater toward the radially outward direction. Therefore, the fastening protrusion P2 may also have a circumferential thickness (width) that is greater toward the radially outward direction. Accordingly, the fastening groove S2 may also have a circumferential width that is greater toward the radial direction. In this structure, the fastening pole shoe 14 may be slidably fitted into the core 11 while moving from the radially outward direction toward the radially inward direction.

[0072] 8b, even if the core 11 and the fastening pole shoe 14 have a shape in which the thickness (width) in the circumferential direction increases toward the radially outward direction, the fastening protrusion P2 and the fastening groove S2 may be provided linearly with a constant width. In this case, the fastening direction does not need to be considered, which further improves the ease of assembly.

[0073] FIG. 9 is a table showing test results comparing the torque and other performance of an axial flux motor equipped with a stator core c according to one embodiment of the present invention with that of an axial flux motor equipped with stator cores a and b of other structures (comparative embodiments).

[0074] As shown in FIG. 9, the axial flux motor c having the core 11 of this embodiment can be seen to produce higher average torque and efficiency than the motors having the cores a and b of other structures.

[0075] 10, 11a and 11b are perspective views showing an example of a mobility device to which an axial magnetic flux motor 100 according to an embodiment of the present invention is applied.

[0076] Mobility devices V1, V2 according to one embodiment of the present invention may include at least main bodies B1, B2, driving means W, P provided in the main bodies B1, B2, motors M1, M2 interlocking with the driving means W, P, and batteries E1, E2 for providing power to the motors. The motors M1, M2 installed on the mobility devices V1, V2 in this embodiment may be the motor 100 described with reference to Figures 1 to 9. As the motor 100 described with reference to Figures 1 to 9 can be installed, a detailed description of its structure will be omitted.

[0077] 10, a mobility device V1 in one embodiment may be a vehicle capable of moving on the ground. The vehicle V1, which is a mobility device, may include at least a main body B1, a wheel W serving as a driving means provided on the main body B1, a motor M1 interlocked with the driving means W, and a battery E1 for providing power to the motor.

[0078] 11a and 11b, the mobility device V2 in one embodiment may be an air mobility device that moves through the air. The air mobility device V2 in one embodiment may include at least a fuselage B2 as the main body, a propellant (e.g., a propeller) P as a driving means provided on the fuselage B2, a motor M2 that operates in conjunction with the propellant P, and a battery E2 that provides power to the motor.

[0079] Fig. 11a shows the position of the propeller P when the air mobility V2 takes off or lands, or hovers at a specific point for turning, and Fig. 11b shows the position of the propeller P when the air mobility V2 moves, i.e., moves. That is, the propeller P of the air mobility V2 may be provided with a structure that allows the direction of the propeller P, which is the propulsion body, to be tilted, and thus the motor 100 that drives the propeller P may also be tilted.

[0080] In the hover mode shown in Figure 11a, the tilt propulsors P of the main wing and / or tail can be rotated to be substantially perpendicular to the fuselage B2, and in the flight mode shown in Figure 11b, the non-tilting propulsors P of the main wing and / or tail can be rotated to be substantially parallel to the fuselage B2. The tilt of the tilt propulsors P of the main wing and / or tail can be synchronized depending on the flight mode, and the tilt of each propulsor can be adjusted differently depending on the attitude control and flight situation in the same flight mode.

[0081] Meanwhile, although specific illustrations are omitted, the mobility device may be a device that moves in a space related to land, underground, air, space, sea, and / or underwater, depending on the space it moves in. Land or underground mobility devices may be provided in the form of, for example, a vehicle, a robot, etc., and air or space mobility devices may be aerial mobility, such as a conventional fixed-wing or rotary-wing aircraft, the recently actively developed Advanced Air Mobility (AAM), an unmanned aerial vehicle or drone, a rocket, a satellite-mounted vehicle, etc. Sea or underwater mobility devices may be, for example, a ship, a submarine, etc. The mobility device is not limited to a specific space and may be a mobile body that can move in all of the above spaces, i.e., a mobile body that can move between multiple spaces, such as an amphibious vehicle or a flying vehicle.

[0082] Although the present invention has been described above with reference to the embodiments, it will be understood by those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit and scope of the present invention as defined in the claims. [Explanation of symbols]

[0083] 100: Motor 10: Stator 11: Core 15: Coil 20: Rotor 21: Rotation axis 22: Rotating plate 23: Core 24: Magnetic material 30: Housing

Claims

1. The coil includes a plurality of cores provided repeatedly in a circumferential direction, and a coil provided on the cores, The core is provided with pole shoes having expanded outer diameters at both ends, One of the pole shoes is a fixed pole shoe that is integral with the core, and the other is a fastening pole shoe that is fastened to the core.

2. The stator assembly for an axial flux motor according to claim 1 , wherein the core and the fastening pole shoe are slidably coupled.

3. 3. The stator assembly of claim 2, wherein one of the core and the fastening pole shoe is provided with a fastening groove, and the other is provided with a fastening protrusion.

4. 4. The stator assembly for an axial magnetic flux motor according to claim 3, wherein the fastening groove and the fastening protrusion have lengths in a radial direction, and the fastening protrusion is slidably fitted into the fastening groove in the radial direction.

5. 4. The stator assembly of claim 3, wherein the fastening grooves and the fastening projections have the same shape, and a fitting tolerance between the fastening grooves and the fastening projections is 0.1 mm or less.

6. The stator assembly for an axial flux motor according to claim 3 , wherein a bond is applied between the fastening groove and the fastening projection.

7. The fastening projection comprises a main body projection extending axially from the core or the fastening pole shoe, The stator assembly for an axial magnetic flux motor according to claim 3 , wherein an axially intermediate portion of the main body projection is provided with a fastening groove having a thickness thinner than that of other portions.

8. The fastening groove has a main groove in the core or the fastening pole shoe in the axial direction on the surface where the core and the fastening pole shoe face each other, The stator assembly for an axial flux motor of claim 3 , wherein the body groove includes a fastening projection projecting inwardly at an axially intermediate portion.

9. 4. The stator assembly for an axial magnetic flux motor according to claim 3, wherein the fastening projections are provided linearly with a constant width.

10. The stator assembly of claim 3 , wherein the fastening protrusions have a shape that increases in width as they extend radially outward.

11. 2. The stator assembly for an axial magnetic flux motor according to claim 1, wherein the pole shoe has an outer diameter expanded in all directions more than the core.

12. a stator including a plurality of cores arranged repeatedly in a circumferential direction and coils arranged on the cores; a rotor having a magnetic body facing the stator in the axial direction and fixed to a rotating shaft, The core is provided with pole shoes having expanded outer diameters at both ends, In the axial flux motor, one of the pole shoes is a fixed pole shoe that is integral with the core, and the other is a fastening pole shoe that is fastened and connected to the core.

13. A fastening groove is provided on one of the core and the fastening pole shoe, and a fastening protrusion is provided on the other. The axial flux motor of claim 12 , wherein the core and the fastening pole shoe are slidingly coupled.

14. The axial flux motor according to claim 13, wherein a coupling tolerance between the fastening groove and the fastening protrusion is 0.1 mm or less.

15. The axial flux motor according to claim 13 , wherein a bond is applied between the fastening groove and the fastening projection.

16. The main body and At least one driving means provided on the body; a battery provided in the main body; an axial flux motor according to any one of claims 12 to 15, coupled to the battery and providing driving power to the at least one driving means.

Images