Axial flux motor

Abstract

The present invention relates to an axial flux motor, and more specifically to an axial flux motor enabling the reduction of the thickness of the motor. A purpose of the present invention is to reduce the thickness of a back yoke by increasing the radial length of the back yoke by applying a permanent magnet and a coil in a skew form, and another purpose of the present invention is to reduce the thickness of the axial flux motor by removing a one-side permanent magnet.

Description

Axial flux motor

[0001] The present invention relates to an axial flux motor, and more particularly, to an axial flux motor capable of reducing the thickness of the motor.

[0002]

[0003] An axial flux motor is a motor in which the magnetic poles of the stator and the permanent magnets of the rotor are arranged in a direction parallel to the rotation axis. Such an axial flux motor has the advantage of being both miniaturized and capable of high output, and is used for various purposes in various fields.

[0004] Typically, an axial flux motor comprises a toroidal rotor and a stator that are arranged opposite each other about the rotation axis. The rotor is mainly a toroidal rotor having permanent magnets and a magnetic material, and the stator is composed of a plurality of teeth formed on a toroidal magnetic plate spaced along the circumference, and a coil that induces an electromagnetic force is wound in the space between the teeth.

[0005] Recent advancements in printed circuit board (PCB) technology have made it possible to manufacture coreless stators. Coreless stators are manufactured by printing coils on a printed circuit board (PCB) rather than winding them on teeth, allowing for a reduction in stator thickness.

[0006]

[0007] An object of the present invention is to reduce the thickness of a back yoke by increasing the radial length of the back yoke by applying permanent magnets and coils in a skew shape, and another object of the present invention is to reduce the thickness of an axial flux motor by removing a one-sided permanent magnet.

[0008]

[0009] According to one aspect of the present invention, an axial flux motor is disclosed, comprising a rotor having a circular shape and including a plurality of permanent magnets arranged in parallel along a circumferential direction, and a stator having a circular shape having the same central axis as the rotor and including a plurality of printed coils arranged in parallel along a circumferential direction, wherein at least one printed circuit board is connected by being laminated in at least one of series and parallel manner, wherein each of the plurality of permanent magnets and the coils is formed to extend from an outer diameter of the rotor and the stator to an inner diameter, and is characterized in that it extends in a skew shape by a predetermined angle in the circumferential direction from a radius connecting the outer diameter and the central axis.

[0010] According to an embodiment, an axial flux motor characterized in that the plurality of permanent magnets and coils extend in the same direction and at the same angle, but the angle between the plurality of permanent magnets and coils extending in the radius and skew shape is less than 45°.

[0011] According to an embodiment, an axial flux motor is disclosed, characterized in that the coil is formed by at least one working conductor extending radially from an outer diameter of the stator to an inner diameter and an end turn extending between the working conductors.

[0012] According to an embodiment, an axial flux motor is disclosed, characterized in that the working conductor is formed to extend from the outer diameter of the stator to the inner diameter, and is in a skew shape inclined at a predetermined angle from a radius connecting the outer diameter and the shaft.

[0013] According to an embodiment, an axial flux motor is disclosed, characterized in that the working conductor has a length of 0.3 mm or more, and the spacing between each working conductor is a value between 0.2 mm and 0.3 mm.

[0014] According to an embodiment, an axial flux motor is disclosed, characterized in that the printed circuit board has a thickness of 0.07 mm or more and a gap between each printed circuit board is 0.2 mm or more.

[0015] According to an embodiment, an axial flux motor is disclosed, characterized in that the rotor is formed to be spaced apart from the stator by 0.6 mm or more.

[0016] According to another aspect of the present invention, an axial flux motor is disclosed, comprising a rotor back yoke, a rotor including a plurality of permanent magnets, a stator including at least one substrate, and the stator back yoke, wherein the rotor back yoke, the rotor, the stator, and the stator back yoke are coaxially laminated along an axial direction, the substrate of the stator has a plurality of work conductor patterns, and the stator back yoke is provided facing the rotor back yoke with the rotor and the stator as the center so as to be a single rotor type in which permanent magnets are provided on only one side of the rotor.

[0017] According to an embodiment, an axial flux motor is disclosed, characterized in that the stator back yoke includes an insulating material on an attachment surface facing the stator.

[0018] According to an embodiment, an axial flux motor is disclosed, characterized in that the stator back yoke includes a material of a soft magnetic material.

[0019] According to an embodiment, an axial flux motor is disclosed, characterized in that the soft magnetic material includes at least one of a silicon steel sheet, a laminated iron core, a ferrite, an amorphous metal, and a soft magnetic powder core (SMC, Soft Magnetic Composite).

[0020] According to an embodiment, an axial flux motor is disclosed, characterized in that the stator back yoke includes a coil-shaped core formed by rolling an electrical steel plate of a soft magnetic material.

[0021] According to an embodiment, an axial flux motor is disclosed, characterized in that the stator has at least one fixing hole formed on one side where the plurality of work conductor patterns are not located.

[0022] According to an embodiment, an axial magnetic flux motor is disclosed, characterized in that the stator back yoke is bolt-fastened to the stator by forming a bolt insertion hole at a position corresponding to a fixing hole of the stator.

[0023] According to an embodiment, an axial magnetic flux motor is disclosed, characterized in that the rotor back yoke has a slot structure into which a plurality of permanent magnets can be inserted, and a plurality of permanent magnets are fixed within the slot.

[0024] According to an embodiment, an axial flux motor is disclosed, characterized in that the plurality of permanent magnets are fixed within the slot, arranged in parallel in the circumferential direction, and permanent magnets of different polarities are arranged alternately.

[0025] According to an embodiment, an axial flux motor is disclosed, characterized in that the substrate of the stator is composed of a printed circuit board including a heat dissipation pattern to improve cooling performance.

[0026] According to an embodiment, an axial flux motor is disclosed, wherein the stator is characterized in that at least one substrate is connected to each other by being stacked in at least one of series and parallel manner.

[0027] According to an embodiment, an axial flux motor is disclosed, characterized in that the rotor back yoke is thicker than the stator back yoke.

[0028]

[0029] According to the present invention, the radial length of the back yoke of an axial flux motor can be increased, the cross-sectional area of ​​the back yoke magnetic path can be fixed, and the thickness of the back yoke can be reduced.

[0030] In addition, according to the present invention, the thickness of the back yoke of the axial flux motor can be reduced.

[0031] In addition, according to the present invention, the thickness of the permanent magnet can be increased by reducing the thickness of the back yoke, thereby improving performance.

[0032] In addition, according to the present invention, the number of layers of the stator can be increased by reducing the thickness of the back yoke, thereby improving performance.

[0033] In addition, according to the present invention, it is easy to manufacture a winding structure applying a skew shape using a stator including a printed circuit board.

[0034] In addition, according to the present invention, it is possible to eliminate the influence of magnetic saturation due to application of coil skew shape regardless of the structure of the core type including teeth by using a stator including a printed circuit board.

[0035] In addition, according to the present invention, the thickness of the permanent magnet can be increased by reducing the thickness of the motor, thereby improving performance.

[0036] In addition, according to the present invention, the number of layers of the stator can be increased by reducing the thickness of the motor, thereby improving performance.

[0037] In addition, according to the present invention, the cost consumed for the permanent magnet can be reduced by eliminating the unilateral permanent magnet.

[0038] In addition, according to the present invention, magnetic saturation of the stator back yoke and the rotor back yoke can be reduced.

[0039] In addition, according to the present invention, the stator back yoke is formed with a horse-shaped core, thereby reducing eddy current loss.

[0040]

[0041] FIG. 1 is a perspective view showing an axial flux motor according to an embodiment of the present invention.

[0042] FIG. 2 is a plan view showing a permanent magnet and coil of an axial flux motor according to an embodiment of the present invention.

[0043] FIG. 3 is a plan view showing a part of a coil of an axial flux motor according to an embodiment of the present invention.

[0044] Fig. 4 is an exploded view showing the configuration of an axial flux motor according to an embodiment of the present invention.

[0045] Fig. 5 is a cross-sectional view showing the configuration of an axial flux motor according to an embodiment of the present invention.

[0046] FIG. 6 is a plan view showing a stator of an axial flux motor according to an embodiment of the present invention.

[0047] Fig. 7 is a plan view showing a rotor back yoke of an axial flux motor according to an embodiment of the present invention.

[0048] Fig. 8 is a plan view showing a rotor of an axial flux motor according to an embodiment of the present invention.

[0049] FIGS. 9 and 10 are cross-sectional views showing a stator back yoke of an axial flux motor according to an embodiment of the present invention.

[0050]

[0051] The above-described objects, features, and advantages of the present invention will become more apparent through the following examples taken in conjunction with the accompanying drawings. The specific structural and functional descriptions below are merely illustrative for the purpose of explaining other embodiments of the present invention, and embodiments according to the present invention may be implemented in various forms and should not be construed as limited to the embodiments described in this specification or application. Since embodiments according to the present invention may have various modifications and may take various forms, specific embodiments are illustrated in the drawings and described in detail in this specification or application. However, this is not intended to limit the embodiments according to the present invention to a specific disclosed form, but should be understood to include all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention. Terms such as first and / or second may be used to describe various components, but the components are not limited to the terms. The above terms are used solely for the purpose of distinguishing one component from another, for example, without departing from the scope of the rights according to the concept of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. When a component is referred to as being connected or coupled to another component, it should be understood that it may be directly connected or coupled to the other component, but there may also be other components in between. Conversely, when a component is referred to as being directly connected or coupled to another component, it should be understood that there are no other components in between. Other expressions used to describe the relationship between components, such as between, directly between, adjacent to, and directly adjacent to, should be interpreted similarly.The terminology used herein is used solely to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. It should be understood that the terms "comprise" and "have" used herein indicate the presence of a described feature, number, step, operation, component, part, or combination thereof, and do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined herein. Hereinafter, the present invention will be described in detail by describing a preferred embodiment of the present invention with reference to the accompanying drawings. The same reference numerals in each drawing represent the same parts.

[0052] FIG. 1 is a perspective view showing an axial flux motor according to an embodiment of the present invention.

[0053] Referring to FIG. 1, an axial flux motor (1000) according to an embodiment of the present invention may have a toroidal shape and include a rotor (100) and a stator (200).

[0054] The rotor (100) has a toroidal shape and may include a plurality of permanent magnets (110) arranged side by side along the circumference. The permanent magnets (110) may have different magnetic properties and may be arranged side by side in an alternating manner. At this time, the plurality of permanent magnets (110) included in the rotor (100) may be formed to extend from the outer diameter to the inner diameter of the rotor (100), and may have a skew shape that extends at a predetermined angle in the circumferential direction from a radius connecting the outer diameter and the central axis. Meanwhile, the rotor (100) may further include a back yoke, and the back yoke needs to secure a magnetic path having a cross-sectional area greater than a certain area to prevent magnetic saturation. Here, the cross-sectional area of ​​the magnetic path of the back yoke is determined by the product of the thickness of the back yoke and the radial length (the length extending from the outer diameter to the inner diameter). Conventionally, the cross-sectional area of ​​the magnetic path is increased by increasing the thickness of the back yoke. The axial magnetic flux motor (1000) according to the present invention can increase the radial length of the back yoke by arranging the permanent magnet (110) in a skew shape, and can reduce the thickness of the back yoke by the increased radial length.

[0055] The stator (200) is arranged between the rotors (100), and may include a core type including teeth (210) and a coreless type that does not include teeth (210) and uses a printed circuit board. The core type stator (200) may include a coil in the teeth (210). However, the axial flux motor (1000) according to the present invention will be described as an example of a coreless type stator (200) using a printed circuit board. The stator (200) has a toroidal shape having the same central axis as the rotor (100), and at least one printed circuit board including a plurality of printed coils arranged side by side along the circumferential direction may be laminated and connected to each other in at least one of series and parallel manner. At this time, the plurality of coils may be formed to extend from the outer diameter to the inner diameter of the stator (200), but may be in a skew shape that extends at an angle inclined by a predetermined angle in the circumferential direction from a radius connecting the outer diameter and the central axis.

[0056] The permanent magnet (110) of the rotor (100) and the coil of the stator (200) may be formed in a skew shape, but may be inclined in the same direction and at the same angle to have the same size. In addition, it is preferable that the angle between the radius connecting the outer diameter and the central axis of the rotor (100) and the stator (200) and the plurality of permanent magnets (110) and coils extending in a skew shape be less than 45° so as to be able to connect the outer diameter and the inner diameter.

[0057] FIG. 2 is a plan view showing a permanent magnet and coil of an axial flux motor according to an embodiment of the present invention.

[0058] First, referring to Fig. 2(a), a plurality of permanent magnets (110) having different magnetic properties can be arranged side by side along the circumferential direction in an alternating manner. As described with reference to Fig. 1, the plurality of permanent magnets (110) can be formed by extending from the outer diameter to the inner diameter, but can be in a skew shape that extends at a predetermined angle in the circumferential direction from the radius connecting the outer diameter and the central axis.

[0059] Referring to Fig. 2(b), a plurality of printed coils (220) may be arranged in parallel along the circumferential direction. At this time, a printed circuit board including a plurality of printed coils (220) may be formed by stacking a plurality of layers. For example, the printed circuit board may be formed by connecting two boards of six layers each in series. In addition, the plurality of printed coils (220) may be formed by at least one working conductor (20) extending radially from the outer diameter to the inner diameter of the stator (200) and an end turn (21) extending between the working conductors (20). The working conductor (20) may be formed by extending from the outer diameter to the inner diameter of the stator (200), but may have a skew shape that is inclined by a predetermined angle from a radius connecting the outer diameter and the central axis. That is, as the working conductor (20) is formed in a skew shape, the coil (220) may also be formed in a skew shape. The printed circuit board can have each layer connected in parallel through a via hole, and the working conductors (20) without end turns (21) can be connected in parallel through the via hole.

[0060] FIG. 3 is a plan view showing a part of a coil of an axial flux motor according to an embodiment of the present invention.

[0061] Referring to FIG. 3, a printed coil (220) can be formed by a working conductor (20) and an end turn (21).

[0062] The working conductor (20) and end turn (21) of the coil (220) may have a predetermined length (D1) and spacing (D2) to form a skew shape. For example, the working conductor (20) may have a length (D1) of 0.3 mm or more, and the spacing (D2) between the working conductor (20) and the end turn (21) may be a value between 0.2 mm and 0.3 mm.

[0063] Additionally, the thickness of the printed circuit board including the printed coil (220) may be 0.07 mm or more, and the spacing between layers of the printed circuit board may be 0.2 mm or more.

[0064] Additionally, the gap between the rotor (100) and the stator (200) may be 0.6 mm or more.

[0065] Fig. 4 is an exploded view showing the configuration of an axial flux motor according to an embodiment of the present invention.

[0066] Referring to FIG. 4, an axial flux motor according to an embodiment of the present invention may include a rotor back yoke (120), a rotor (100) including a plurality of permanent magnets (110), a stator (200), a stator back yoke (230), and an insulating material (240). At this time, the rotor back yoke (120), the rotor (100), the stator (200), the stator back yoke (230), and the insulating material (240) are all in a toroidal shape, and the stator back yoke (230) may be provided facing the rotor back yoke (120) with the rotor (100) and the stator (200) as the center so as to be a single rotor type in which the rotor (100) is coaxially stacked along the axial direction and the permanent magnets (110) are provided only on one side of the rotor (100). In addition, the axial flux motor according to an embodiment of the present invention may include a rotor back yoke (120), a rotor (100), a stator (200), and a shaft (50) that penetrates the central axis in the vertical direction of the stator back yoke (230).

[0067] The rotor back yoke (120) has a slot structure in which a plurality of permanent magnets (110) can be inserted on one side facing the rotor (100), so that a plurality of permanent magnets (110) can be fixed within the slot.

[0068] The rotor (100) may include a plurality of permanent magnets (110). The plurality of permanent magnets (110) may be arranged in parallel in the circumferential direction of the rotor (100). In addition, the plurality of permanent magnets (110) of the rotor (100) may be arranged in a manner in which permanent magnets of different polarities are alternately arranged. That is, the plurality of permanent magnets (110) of the rotor (100) may be arranged in parallel in the circumferential direction of the rotor (100) in a manner in which permanent magnets of N and S poles are alternately arranged.

[0069] The stator (200) may include at least one substrate, i.e., a printed circuit board. The stator (200) may be formed by stacking and connecting at least one substrate in at least one of series and parallel manners. The axial flux motor according to the present invention is a coreless type in which teeth are removed from the stator (200), and the stator (200) may be formed of a plurality of printed circuit boards.

[0070] The substrate of the stator (200) may be provided with a plurality of working conductors. At this time, the plurality of working conductors formed on the substrate of the stator (200) may be formed in a pattern in a straight line shape in a circumferential direction from the outer surface of the stator (200) toward the central axis of the stator (200). In addition, the substrate of the stator (200) may include a heat dissipation pattern to improve cooling performance.

[0071] The stator back yoke (230) may be provided facing the rotor back yoke (120) with the rotor (100) and stator (200) as the center so as to be a single rotor type. At this time, a stator (200) including a plurality of substrates may be attached to the stator back yoke (230). The stator back yoke (230) may include an insulating material (240) for insulation on the attachment surface to which the stator (200) is attached.

[0072] In addition, the stator back yoke (230) may include a soft magnetic material. For example, the stator back yoke (230) may include a soft magnetic material including at least one of a silicon steel plate, a laminated iron core, a ferrite, an amorphous metal, and a powder core. In this case, the soft magnetic material of the stator back yoke (230) may be applied to an area corresponding to the width of the work conductor formed on the stator (200).

[0073] The stator back yoke (230) can be attached to the stator (200) using an adhesive. In addition, the stator (200) has at least one fixing hole formed on one side where a plurality of work conductors are not located, and the stator back yoke (230) has a bolt insertion hole formed at a position corresponding to the fixing hole formed in the stator (200) so that it can be bolt-fastened to the stator (200).

[0074] That is, the axial flux motor according to the present invention with the above-described structure can be formed into a single rotor type by removing the permanent magnet on one side of the existing double rotor type and configuring a stator back yoke (230) instead of the rotor back yoke on the rotor side from which the permanent magnet has been removed.

[0075] At this time, the rotor back yoke (120) may be thicker than the stator back yoke (230). For example, when the thickness of the rotor back yoke (120) is a, the thickness of the rotor (100) is b, the thickness of the stator back yoke (230) is c, and the bh max (maximum magnetic energy product) value of a plurality of permanent magnets included in the rotor (100) is d, and when d has a value of 10 to 55 [MGOe], the axial flux motor is such that the thickness a of the rotor back yoke (120) is b <a<(d*0.1)*b 일때, 고정자 백요크(230)의 두께 c는 0.7*b<c<(d*0.08)*b일때 가장 높은 무부하 역기전력[Vms]을 갖을 수 있다.

[0076] Fig. 5 is a cross-sectional view showing the configuration of an axial flux motor according to an embodiment of the present invention.

[0077] Referring to FIG. 5, an axial flux motor according to an embodiment of the present invention may include a rotor back yoke (120), a rotor (100) including a plurality of permanent magnets (110), a stator (200), a stator back yoke (230), a shaft (50), and a cover (300). At this time, the rotor back yoke (120), the rotor (100), the stator (200), the stator back yoke (230), and the cover (300) are all in a toroidal shape, and the stator back yoke (230) may be provided to face the rotor back yoke (120) with the rotor (100) and the stator (200) as the center so as to become a single rotor type in which permanent magnets are provided on only one side of the rotor (100). In addition, the axial flux motor according to an embodiment of the present invention may include a rotor back yoke (120), a rotor (100), a stator (200), and a shaft (50) that penetrates the central axis in the vertical direction of the stator back yoke (230). In addition, the cover (300) may be formed in a form that surrounds the outer side of the structure in which the rotor back yoke (120), the rotor (100), the stator (200), and the stator back yoke (230) are laminated.

[0078] FIGS. 6 to 8 are plan views each showing a stator (200), a rotor back yoke (120), and a rotor (100) of an axial flux motor according to an embodiment of the present invention.

[0079] First, referring to FIG. 6, the stator (200) of the axial flux motor according to the embodiment of the present invention may be formed with a plurality of working conductors (20). At least one substrate included in the stator (200) is formed with a plurality of working conductors (20), and the substrates on which the working conductors (20) are formed may be laminated in at least one of a series and a parallel manner.

[0080] In addition, the stator (200) may have at least one fixing hole (H) formed on one side where the plurality of work conductors (20) are not positioned. Referring to FIG. 6, the fixing hole (H) is illustrated as being positioned on the inside of the stator (200), but may also be positioned on the outside depending on the embodiment, and the number of fixing holes (H) may also vary depending on the embodiment.

[0081] Referring to FIG. 7, the rotor back yoke (120) of the axial flux motor according to an embodiment of the present invention may have a slot (121) formed therein. The rotor back yoke (120) may have partition walls (122) formed along the circumference at predetermined intervals, and may have slots (121) formed in which a plurality of permanent magnets (110) may be inserted into the spaces between the partition walls (122).

[0082] Referring to FIG. 8, the rotor (100) of the axial flux motor according to the embodiment of the present invention includes a plurality of permanent magnets, and the plurality of permanent magnets may be arranged in parallel along the circumferential direction of the rotor (100). At this time, the plurality of permanent magnets may be arranged in a manner in which permanent magnets of different polarities are alternately arranged, as illustrated in FIG. 8. That is, the plurality of permanent magnets of the rotor (100) may be arranged in parallel in the circumferential direction of the rotor (100) with permanent magnets of N and S poles alternately arranged.

[0083] FIGS. 9 and 10 are cross-sectional views showing a stator back yoke of an axial flux motor according to an embodiment of the present invention.

[0084] Referring to Fig. 9, the stator back yoke (230) of the axial flux motor according to the present invention may include a coil-shaped core formed by rolling an electrical steel plate of a soft magnetic material. The stator back yoke (230) is formed as a coil-shaped core, thereby reducing eddy current loss.

[0085] Referring to FIG. 10, the stator back yoke (230) of the axial flux motor according to the present invention may include a structure in which at least one electrical steel plate of a soft magnetic material is laminated.

[0086] In addition, the stator back yoke (230) has a bolt insertion hole (H') formed at a position corresponding to the fixing hole (H) of the stator (200) so that it can be bolt-fastened to the stator (200). At this time, the bolt insertion hole (H') of the stator back yoke (230) can be formed to correspond to the position and number of the fixing holes (H) of the stator (200).

[0087] Although preferred embodiments of the present invention have been described above, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but rather to explain it. Therefore, the technical spirit of the present invention includes not only each disclosed embodiment but also a combination of disclosed embodiments, and further, the scope of the technical spirit of the present invention is not limited by these embodiments. In addition, those skilled in the art to which the present invention pertains can make numerous changes and modifications to the present invention without departing from the spirit and scope of the appended claims, and all such appropriate changes and modifications should be considered as equivalents and falling within the scope of the present invention.

Claims

1. A rotor having a circular shape and including a plurality of permanent magnets arranged in parallel along the circumference; and A stator having a toroidal shape having the same central axis as the rotor and including at least one printed circuit board including a plurality of printed coils arranged side by side along the circumferential direction, and connected by being laminated in at least one of series and parallel manner; Each of the above plurality of permanent magnets and coils, A skew shape formed by extending from the outer diameter of the rotor and stator to the inner diameter, and extending at a predetermined angle in the circumferential direction from the radius connecting the outer diameter and the central axis. An axial flux motor characterized by:

2. In paragraph 1, The above plurality of permanent magnets and coils, The plurality of permanent magnets and coils extending in the same direction and at the same angle, but the angle between the plurality of permanent magnets and coils extending in the shape of the radius and skew is less than 45°. An axial flux motor characterized by:

3. In paragraph 1, The above coil, Formed by at least one working conductor extending radially from the outer diameter to the inner diameter of the stator and an end turn extending between the working conductors An axial flux motor characterized by:

4. In paragraph 3, The above working conductor is, A skew shape formed by extending from the outer diameter of the stator to the inner diameter, but tilted at a predetermined angle from the radius connecting the outer diameter and the shaft. An axial flux motor characterized by:

5. In paragraph 3, The above working conductor is, The length is 0.3 mm or more, and the spacing between each working conductor is between 0.2 mm and 0.3 mm. An axial flux motor characterized by:

6. In paragraph 1, The above printed circuit board, The thickness is 0.07 mm or more, and the gap between the layers of each printed circuit board is 0.2 mm or more. An axial flux motor characterized by:

7. In paragraph 1, The above rotor, Formed with a gap of 0.6 mm or more from the above stator An axial flux motor characterized by:

8. Rotor back yoke; A rotor comprising a plurality of permanent magnets; a stator comprising at least one substrate; and including the stator back yoke; The above rotor back yoke, rotor, stator and stator back yoke are coaxially stacked along the axial direction, The substrate of the above stator has a plurality of working conductor patterns, The stator back yoke is provided facing the rotor back yoke with the rotor and stator as the center, so that it becomes a single rotor type in which permanent magnets are provided only on one side of the rotor. An axial flux motor characterized by:

9. In paragraph 8, The above stator back yoke is, Including an insulating material on the attachment surface facing the stator An axial flux motor characterized by:

10. In paragraph 8, The above stator back yoke is, Containing materials of soft magnetic properties An axial flux motor characterized by:

11. In paragraph 10, The above soft magnetic material is, Containing at least one of a silicon steel sheet, a laminated iron core, a ferrite, an amorphous metal, and a soft magnetic composite (SMC) core An axial flux motor characterized by:

12. In paragraph 10, The above stator back yoke is, A core comprising a coil-shaped core formed by rolling an electrical steel sheet of a soft magnetic material An axial flux motor characterized by:

13. In paragraph 10, The above stator back yoke is, A structure comprising at least one electrical steel sheet of a soft magnetic material laminated thereon An axial flux motor characterized by:

14. In paragraph 8, The above stator is, At least one fixing hole is formed on one side where the plurality of work conductor patterns are not located. An axial flux motor characterized by:

15. In paragraph 14, The above stator back yoke is, A bolt insertion hole is formed at a position corresponding to the fixing hole of the stator and is bolt-connected to the stator. An axial flux motor characterized by:

16. In paragraph 8, The above rotor back yoke is, A slot structure capable of inserting the above-mentioned plurality of permanent magnets is provided, and the plurality of permanent magnets are fixed within the slot. An axial flux motor characterized by:

17. In paragraph 16, The above plurality of permanent magnets are, Fixed within the above slot, permanent magnets arranged in parallel in the circumferential direction and having different polarities are arranged alternately. An axial flux motor characterized by:

18. In paragraph 8, The substrate of the above stator is, Consisting of a printed circuit board containing a heat dissipation pattern to improve cooling performance An axial flux motor characterized by:

19. In paragraph 8, The above stator is, At least one of the above substrates is connected by being stacked in at least one of serial and parallel manners. An axial flux motor characterized by:

20. In paragraph 8, The above rotor back yoke is, An axial flux motor characterized by having a thickness greater than that of the stator back yoke.

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