Printed circuit board for stator of axial flux motor

Abstract

The present invention relates to a printed circuit board for a stator of an axial flux motor, and more specifically, to a printed circuit board for a stator of an axial flux motor including a printed circuit board pattern capable of improving the efficiency of an axial flux motor. The objective of the present invention is to increase the efficiency of an axial flux motor by designing a coil pattern in the shape of a distributed winding, including radial conductors and via holes.

Description

Technology Field

[0001] The present invention relates to a printed circuit board for a stator of an axial flux motor, and more specifically, to a printed circuit board for a stator of an axial flux motor comprising a printed circuit board pattern capable of improving the efficiency of the axial flux motor. Background Technology

[0002] An axial flux motor is a motor in which the magnetic poles of the stator and the permanent magnets of the rotor are arranged opposite each other in a direction parallel to the axis of rotation. Such axial flux motors have the advantage of enabling both miniaturization and high output, so they are used for various applications in many fields.

[0003] Generally, an axial flux motor is configured to include a toroidal (toridal) rotor and a stator positioned opposite each other with respect to the rotation axis. The rotor is mainly a toroidal rotor having a permanent magnet composed of a permanent magnet and a magnetic material, and the stator is configured in a shape in which multiple teeth are formed spaced apart along the circumferential direction on a toroidal magnetic plate, and a coil that induces electromagnetic force is wound in the space between the teeth.

[0004] Recently, advancements in printed circuit board (PCB) technology have made it possible to manufacture coreless stators. Since coreless stators are produced by printing coils onto a PCB rather than winding them onto teeth, the thickness of the stator can be reduced.

[0005] Generally, these axial flux motors utilize a concentrated winding pattern on the printed circuit board (PCB) in which the coil pattern is wound in a spiral structure. However, this concentrated winding pattern results in inefficient utilization of flux linkage for each turn due to the smaller flux linkage area on the inner side compared to the outer side. Additionally, there is a disadvantage in terms of the number of turns because the available winding methods are limited. Therefore, there is a need for a printed circuit board pattern that can increase the efficiency of axial flux motors and utilize various winding methods. The problem to be solved

[0006] The present invention is intended to solve the problems described above, and the objective of the present invention is to increase the efficiency of an axial magnetic flux motor by designing a coil pattern with a distributed winding shape including a radial conductor and via holes. means of solving the problem

[0008] According to one aspect of the present invention, a printed circuit board for a stator of an axial flux motor is disclosed, comprising at least one annular substrate body, a first conductor module including a plurality of conductor patterns formed at predetermined intervals and extending radially from the substrate body, a second conductor module including a plurality of conductor patterns formed tangentially on the outer side of the substrate body, and a third conductor module including a plurality of conductor patterns formed tangentially on the inner side of the substrate body, wherein the first conductor module is connected between the second conductor module and the third conductor module, and each conductor pattern included in the first conductor module includes a first via hole on the inner side close to the third conductor module and a second via hole on the outer side close to the second conductor module.

[0009] According to an embodiment, a printed circuit board for a stator of an axial flux motor is disclosed, characterized in that the substrate body has a stacked structure and is electrically connected to the first via hole and the second via hole included in the conductor pattern of the first conductor module through a conductor penetrating in a vertical direction.

[0010] According to an embodiment, a printed circuit board for a stator of an axial flux motor is disclosed, characterized in that the first via hole is located in a conductor pattern included in the first conductor module and is formed at the position closest to the third conductor module.

[0011] According to an embodiment, a printed circuit board for a stator of an axial flux motor is disclosed, characterized in that the first via hole is located in a conductor pattern included in the first conductor module, and the distance between the center of the substrate body and the center of the first via hole is determined by the following [Equation 1].

[0012] [Mathematical Formula 1]

[0013]

[0014] (G BC is the spacing between conductor patterns included in the first conductor module, D PI is the inner diameter of the above substrate body, W IE is the width of the conductor pattern included in the third conductor module, D IP is the diameter of the first via hole included in each conductor pattern of the first conductor module.

[0015] According to an embodiment, a printed circuit board for a stator of an axial flux motor is disclosed, characterized in that the second via hole is located in a conductor pattern included in the first conductor module, and is formed at the position closest to the second conductor module.

[0016] According to an embodiment, a printed circuit board for a stator of an axial flux motor is disclosed, characterized in that the second via hole is located in a conductor pattern included in the first conductor module, and the distance between the center of the substrate body and the center of the second via hole is determined by the following [Equation 2].

[0017] [Mathematical Formula 2]

[0018]

[0019] (G BC is the spacing between conductor patterns included in the first conductor module, D PO is the outer diameter of the above substrate body, W OE is the width of the conductor pattern included in the second conductor module, D OP is the diameter of the second via hole included in each conductor pattern of the first conductor module.

[0020] According to an embodiment, a printed circuit board for a stator of an axial flux motor is disclosed, characterized in that the substrate body is a structure that is stacked together, and is stacked in multiples of the following [Equation 3].

[0021] [Mathematical Formula 3]

[0022]

[0023] (m is a constant)

[0024] According to an embodiment, a printed circuit board for a stator of an axial flux motor is disclosed, characterized in that each conductor included in the first conductor module has a widest width closest to the second conductor module determined by the following [Equation 4].

[0025] [Mathematical Formula 4]

[0026]

[0027] (G BC is the spacing between conductor patterns included in the first conductor module, D PO is the outer diameter of the above substrate body, W OEis the width of the conductor pattern included in the second conductor module, N slot is the number of motor slots, N CPS is the number of conductors of the first conductor module per slot per layer) Effects of the invention

[0028] According to the present invention, the substrate can be configured in a stacked structure by including via holes in the conductors included in the printed circuit board.

[0029] In addition, according to the present invention, torque density can be improved by selecting the optimal via hole location within the conductor.

[0030] In addition, according to the present invention, it is possible to select the coil pattern width based on the number of conductors per slot and the pattern spacing.

[0031] In addition, according to the present invention, it is possible to select the equivalent end turns and the number of printed circuit board layers considering the connection between conductors.

[0032] In addition, according to the present invention, the length of the conductor can be utilized to its maximum extent by selecting the optimal via hole location within the conductor.

[0033] In addition, according to the present invention, by selecting the optimal via hole location within the conductor, the amount of heat generated due to copper loss can be distributed to each layer.

[0034] In addition, according to the present invention, the substrate can be formed into a stacked structure to reduce heat loss caused by the current flowing through the conductor. Brief explanation of the drawing

[0035] FIG. 1 is a front view showing a printed circuit board for a stator of an axial flux motor according to an embodiment of the present invention. FIG. 2 is a front view showing a first via hole of a printed circuit board for a stator of an axial flux motor according to an embodiment of the present invention. FIG. 3 is a front view showing a second via hole of a printed circuit board for a stator of an axial flux motor according to an embodiment of the present invention. FIG. 4 is an exploded perspective view showing the stacked structure of a printed circuit board for a stator of an axial flux motor according to an embodiment of the present invention. Specific details for implementing the invention

[0036] The objects, features, and advantages of the present invention described above will become more apparent through the following embodiments in connection with the accompanying drawings. The specific structural or functional descriptions below are merely illustrative for the purpose of explaining other embodiments of the concept of the present invention, and embodiments according to the concept of the present invention may be implemented in various forms and should not be interpreted as being limited to the embodiments described in this specification or application. Since embodiments according to the concept of the present invention may be subject to 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 concept of the present invention to specific disclosed forms, and should be understood to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. Terms such as "first" and / or "second" may be used to describe various components, but said components are not limited to said terms. The above terms may be used solely for the purpose of distinguishing one component from other components, for example, without departing from the scope of rights according to the concept of the present invention, such that the first component may be named the second component, and similarly, the second component may be named the first component. When it is stated that a component is connected to or coupled with another component, it should be understood that it may be directly connected to or coupled with that other component, or that there may be other components in between. On the other hand, when it is stated that a component is directly connected to or directly coupled with 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, immediately between, adjacent to, and directly adjacent to, should be interpreted in the same way.The terms used in this specification are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as "include" or "have" in this specification are intended to indicate the existence of the described features, numbers, steps, actions, components, parts, or combinations thereof, and should not be understood as precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this specification. The invention will be described in detail below by describing preferred embodiments of the invention with reference to the accompanying drawings. Identical reference numerals in each drawing indicate identical components.

[0037] FIG. 1 is a front view showing a printed circuit board for a stator of an axial flux motor according to an embodiment of the present invention.

[0038] Referring to FIG. 1, a printed circuit board (1000) for a stator of an axial flux motor according to an embodiment of the present invention may include an annular board body (100), a first conductor module (110), a second conductor module (120), and a third conductor module (130). The second conductor module (120) may include a plurality of conductor patterns formed tangentially on the outer side of the board body (100). The third conductor module (130) may include a plurality of conductor patterns formed tangentially on the inner side of the board body (100). The conductor patterns included in the second and third conductor modules (120, 130) may include end turns. That is, the second and third conductor modules (120, 130) may be formed at both ends of a coil winding.

[0039] The first conductor module (110) may include a plurality of conductor patterns formed at predetermined intervals and extending radially in the substrate body (100). The first conductor module (110) may include effective conductors that face the permanent magnet of the rotor included in the motor. Each conductor pattern included in the first conductor module (100) may include a first via hole and a second via hole on the inner side and the outer side, respectively. That is, the first via hole may be located on the inner side close to the third conductor module (130), and the second via hole may be located on the outer side close to the second conductor module (120).

[0040] At least one substrate body (100) can be electrically connected to each other through a conductor that penetrates the first via hole and the second via hole included in the conductor pattern of the first conductor module (110) in a vertical direction.

[0041] Referring to FIGS. 2 and 3, a printed circuit board for a stator of an axial flux motor according to an embodiment of the present invention may include a first via hole (111) and a second via hole (112) within a plurality of conductor patterns included in a first conductor module (110). The first via hole (111) may be located in a conductor pattern included in the first conductor module, and may be formed at the position closest to the third conductor module (130).

[0042] The first via hole (111) is located in a conductor pattern included in the first conductor module (110), and the distance between the center of the substrate body (100) and the center of the first via hole (111) can be determined by the following [Equation 1].

[0043] [Mathematical Formula 1]

[0044]

[0045] Here, G BC is the spacing between conductor patterns included in the first conductor module, D PI is the inner diameter of the above substrate body, W IE is the width of the conductor pattern included in the third conductor module, D IP represents the diameter of the first via hole included in each conductor pattern of the first conductor module.

[0046] That is, the printed circuit board for the stator of the axial flux motor according to the present invention can determine the optimal position of the first via hole (111) according to the size of the conductor and the board body.

[0047] The second via hole (112) is located in the conductor pattern included in the first conductor module, and can be formed at the location closest to the second conductor module (120).

[0048] The second via hole (112) is located in a conductor pattern included in the first conductor module (110), and the distance between the center of the substrate body (100) and the center of the second via hole (112) can be determined by the following [Equation 2].

[0049] [Mathematical Formula 2]

[0050]

[0051] Here, G BC is the spacing between conductor patterns included in the first conductor module, D PO is the outer diameter of the above substrate body, W OE is the width of the conductor pattern included in the second conductor module, D OP represents the diameter of the second via hole included in each conductor pattern of the first conductor module.

[0052] That is, the printed circuit board for the stator of the axial flux motor according to the present invention can determine the optimal position of the second via hole (112) according to the size of the conductor and the board body.

[0053] At this time, the widest width of each conductor included in the first conductor module (110) that is closest to the second conductor module (120) can be determined by the following [Equation 3].

[0054] [Mathematical Formula 3]

[0055]

[0056] Here, G BC is the spacing between conductor patterns included in the first conductor module, D PO is the outer diameter of the above substrate body, W OE is the width of the conductor pattern included in the second conductor module, N slot is the number of motor slots, N CPS represents the number of conductors of the first conductor module per slot per layer.

[0057] FIG. 4 is an exploded perspective view showing the stacked structure of a printed circuit board for a stator of an axial flux motor according to an embodiment of the present invention.

[0058] Referring to FIG. 4, a printed circuit board for a stator of an axial flux motor according to an embodiment of the present invention can be electrically connected by being stacked through a first via hole (111) and a second via hole (112) included in a first conductor module (110). FIG. 4 illustrates an embodiment in which a substrate body (100) is stacked in a total of 6 layers, but the number of layers of the stacked structure can be formed in various ways depending on the embodiment.

[0059] For example, the substrate body (100) has a structure that is stacked with each other, and can be stacked in multiples of the following [Equation 4].

[0060] [Mathematical Formula 4]

[0061]

[0062] (m is a constant)

[0063] Although preferred embodiments of the present invention have been described above, the embodiments disclosed in the present invention are intended only to illustrate, not to limit, the technical scope of the present invention. Accordingly, the technical scope of the present invention includes not only each disclosed embodiment but also combinations of the disclosed embodiments, and furthermore, the scope of the technical scope of the present invention is not limited by such embodiments. In addition, a person 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 deemed to fall within the scope of the present invention as equivalents. Explanation of the symbols

[0064] 100 : Substrate body 110: First conductor module 111 : 1st via hole 112 : 2nd via hole 120 : Second conductor module 130: Third conductor module

Claims

Claim 1 A printed circuit board for a stator of an axial flux motor comprising: at least one annular substrate body; a first conductor module including a plurality of conductor patterns formed at predetermined intervals and extending radially from the substrate body; a second conductor module including a plurality of conductor patterns formed tangentially on the outer side of the substrate body; and a third conductor module including a plurality of conductor patterns formed tangentially on the inner side of the substrate body; wherein the first conductor module is connected between the second conductor module and the third conductor module, and each conductor pattern included in the first conductor module includes a first via hole on the inner side close to the third conductor module and a second via hole on the outer side close to the second conductor module, and wherein each conductor included in the first conductor module has a widest width close to the second conductor module determined by the following [Equation 1]. [Equation 1] (G BC is the spacing between conductor patterns included in the first conductor module, D PO is the outer diameter of the above substrate body, W OE is the width of the conductor pattern included in the second conductor module, N slot is the number of motor slots, N CPS A printed circuit board for a stator of an axial flux motor characterized by the number of conductors of a first conductor module per slot per layer. Claim 2 A printed circuit board for a stator of an axial flux motor according to claim 1, wherein the substrate body has a stacked structure and is electrically connected to the other through a conductor penetrating the first via hole and the second via hole included in the conductor pattern of the first conductor module in a vertical direction. Claim 3 A printed circuit board for a stator of an axial flux motor according to claim 2, wherein the first via hole is located in a conductor pattern included in the first conductor module and is formed at the position closest to the third conductor module. Claim 4 A printed circuit board for a stator of an axial flux motor according to claim 3, wherein the first via hole is located in a conductor pattern included in the first conductor module, and the distance between the center of the substrate body and the center of the first via hole is determined by the following [Equation 2]. [Equation 2] (G BC is the spacing between conductor patterns included in the first conductor module, D PI is the inner diameter of the above substrate body, W IE is the width of the conductor pattern included in the third conductor module, D IP is the diameter of the first via hole included in each conductor pattern of the first conductor module. Claim 5 A printed circuit board for a stator of an axial flux motor according to claim 2, wherein the second via hole is located in a conductor pattern included in the first conductor module and is formed at the position closest to the second conductor module. Claim 6 A printed circuit board for a stator of an axial flux motor according to claim 5, wherein the second via hole is located in a conductor pattern included in the first conductor module, and the distance between the center of the substrate body and the center of the second via hole is determined by the following [Equation 3]. [Equation 3] (G BC is the spacing between conductor patterns included in the first conductor module, D PO is the outer diameter of the above substrate body, W OE is the width of the conductor pattern included in the second conductor module, D OP is the diameter of the second via hole included in each conductor pattern of the first conductor module. Claim 7 A printed circuit board for a stator of an axial flux motor according to claim 2, wherein the substrate body has a structure that is stacked with respect to one another, and is stacked by a multiple of the following [Equation 4]. [Equation 4] (m is a constant) Claim 8 delete

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