Coil array for electromagnetic machinery and moving electromagnetic machinery using the same

Abstract

The present application relates to a coil array and a mobile electromagnetic machine utilizing the same, characterized in that it includes: a first coil array and a second coil array, wherein the first coil array and the second coil array are separated by a preset interval and have a mirror image in the separation direction, the first coil array includes at least one first half-cycle and at least one second half-cycle formed adjacent to each other, the first half-cycle includes at least two coils with different current flow directions, and the first half-cycle and the second half-cycle have a mirror image in the adjacent direction; this can minimize leakage magnetic flux and core loss, maximize efficiency, and improve power.

Description

Technical Field

[0001] The present application relates to a coil array for an electromagnetic machine and a mobile electromagnetic machine using the same, and more particularly to a structure in which the coil array has a magnetic flux that is enhanced in one direction and canceled in other directions. Background Art

[0002] Across various industrial fields, there is a significant demand for reversible electromagnetic machines that include rotating components within systems. Generators convert the mechanical energy generated by the rotational motion of these rotating components into electrical energy, depending on the operating conditions of the system in which they are installed. The electricity generated by these generators can be supplied to or stored in other system components. Furthermore, electric motors supply electrical energy to machinery, converting it into mechanical energy to rotate the rotating components and generate rotational power.

[0003] This type of electromagnetic machine consists of a stator and a rotor. Generally speaking, it operates based on the principle that the rotor generates torque due to the rotating magnetic field generated by current flowing through the stator coil. The force generated by the torque is used as rotational power.

[0004] Generally speaking, in electric motors using an iron core, the stator is typically manufactured by winding coils around an iron core formed at predetermined intervals along its inner circumference. However, this poses a problem of low motor efficiency due to core loss. Furthermore, in electric motors using a magnetic core, performance can be limited due to magnetic flux saturation within the core, or increased magnetic leakage can lead to performance limits. Summary of the Invention

[0005] The present application has been developed precisely to solve the above-mentioned previous problems. The purpose of the present application is to provide a coil array and a mobile electromagnetic machine, so that the coil array has a structure in which the magnetic flux is enhanced in one direction and offset in other directions, thereby maximizing the efficiency of the electromagnetic machine by utilizing the enhanced magnetic force, increasing the power or minimizing the size and weight of the machine.

[0006] As an embodiment for achieving the above-mentioned objectives, a coil array according to one embodiment of the present application is characterized by including: a first coil array and a second coil array, wherein the first coil array and the second coil array are separated by a preset interval and have a mirror image in the separation direction, the first coil array includes at least one first half-cycle and at least one second half-cycle formed adjacent to each other, the first half-cycle includes at least two coils with different current flow directions, and the first half-cycle and the second half-cycle have a mirror image in the adjacent direction.

[0007] In addition, a direction of a magnetic field formed between two coils forming the first half cycle and a direction of a magnetic field formed between two coils forming the second half cycle may be opposite to each other.

[0008] In addition, the first half cycle may include: a first layer, the first layer including at least two coils with different current flow directions, adjacent to the second coil array; a second layer, the second layer including a second layer coil structure having the same current direction as the coil structure of the first layer but located outside the first layer coil structure, located above the first layer; and a third layer, the third layer including a third layer coil structure having a current direction opposite to that of the second layer coil structure but located inside the second layer coil structure, located above the second layer.

[0009] In addition, the system may further include: a fourth layer including a fourth layer coil structure having the same current direction as the coil structure of the third layer but located outside the third layer coil structure, and located above the third layer.

[0010] In addition, the first half cycle may include: a lower layer, the lower layer including at least two coils with different current flow directions, adjacent to the second coil array; an upper layer, the upper layer including an upper coil structure with a current direction opposite to that of the lower coil structure, located above the lower layer.

[0011] In addition, the first coil array may include a plurality of first half periods and a plurality of second half periods, and the first half periods and the second half periods may be periodically formed in adjacent directions.

[0012] In addition, with respect to the first coil array or the second coil array, the length may be extended along the current flow direction, including a segmented toroidal (Toroid) or segmented solenoid (Solenoid) current distribution.

[0013] In addition, the coil array may be formed in at least two groups, and currents flowing in the coils constituting the respective groups may have the same phase as each other or different phases from each other.

[0014] Furthermore, the currents flowing through the coils constituting the respective groups have phase differences, thereby forming a moving magnetic field.

[0015] As an embodiment for achieving the above-mentioned purpose, a mobile electromagnetic machine according to an embodiment of the present application is characterized in that it includes a stator and a mover, and the stator includes a first coil array, the first coil array includes at least one first half-cycle and at least one second half-cycle formed adjacent to each other, the first half-cycle includes at least two coils with different current flow directions, and the first half-cycle and the second half-cycle have mirror images in adjacent directions.

[0016] In addition, the stator may further include: a second coil array, the second coil array being formed at a predetermined interval from the first coil array and having a mirror image in a direction of the interval.

[0017] In addition, the mover may be formed between the first coil array and the second coil array.

[0018] In addition, the first coil array and the second coil array may be formed in at least two groups, and currents flowing through the coils constituting the respective groups may have different phases from each other, thereby forming a moving magnetic field.

[0019] In addition, the mover may include: a second coil array, which is formed at a predetermined interval from the first coil array and has a mirror image in a direction of the interval.

[0020] In addition, a direction of a magnetic field formed between two coils forming the first half cycle and a direction of a magnetic field formed between two coils forming the second half cycle may be opposite to each other.

[0021] In addition, the first half cycle may include: a first layer, the first layer including at least two coils with different current flow directions, adjacent to the second coil array; a second layer, the second layer including a second layer coil structure having the same current direction as the coil structure of the first layer but located outside the first layer coil structure, located above the first layer; and a third layer, the third layer including a third layer coil structure having a current direction opposite to that of the second layer coil structure but located inside the second layer coil structure, located above the second layer.

[0022] In addition, the first half cycle may include: a lower layer, the lower layer including at least two coils with different current flow directions, adjacent to the second coil array; and an upper layer, the upper layer including an upper coil structure with a current direction opposite to that of the lower coil structure, located above the lower layer.

[0023] In addition, the first coil array may include a plurality of first half periods and a plurality of second half periods, and the first half periods and the second half periods may be periodically formed in adjacent directions.

[0024] In addition, with respect to the first coil array, the length may be extended along the current flow direction, including a segmented toroidal (Toroid) or segmented solenoid (Solenoid) current distribution.

[0025] In addition, the mover may be a rotor.

[0026] Therefore, through the above-mentioned problem solving, the following effects are expected.

[0027] The coil array according to the present application has a structure in which magnetic flux is strengthened in one direction and canceled in other directions, thereby having the effect of almost eliminating leakage magnetic fields outside the region of interest.

[0028] In addition, the electromagnetic machine according to the present application has the advantage of being able to maximize mechanical efficiency and improve power by utilizing the enhanced magnetic force.

[0029] The electromagnetic machine according to the present invention does not use or uses a minimal iron core, thereby minimizing core loss, size, and weight. The electromagnetic machine according to the present invention does not use or uses a minimal iron core, thereby having the advantage of a large margin in terms of performance limits or restrictions. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic cross-sectional view schematically illustrating the current flow and magnetic flux size of a coil array according to one embodiment of the present application.

[0031] Figure 2 1 is a schematic cross-sectional view of a coil array according to an embodiment of the present application, illustrating two phase-difference coil array groups.

[0032] Figure 3 is a schematic cross-sectional view schematically illustrating the current flow and magnetic flux size of a coil array according to an embodiment of the present application.

[0033] Figure 4 3D is a schematic diagram of a coil array structure according to an embodiment of the present application.

[0034] Figure 5 FIG. 4 is a conceptual diagram schematically illustrating the interaction between a magnetic field and an electric current generated by a coil array structure according to an embodiment of the present application.

[0035] Figure 6 FIG. 1 is a schematic cross-sectional view schematically illustrating a coil array having stacked coils and applying the coil array according to an embodiment of the present application in a horizontal direction.

[0036] Figure 7 FIG. 1 is a schematic cross-sectional view schematically illustrating a coil array having a stacked coil and applying the coil array according to an embodiment of the present application in a three-dimensional structure.

[0037] Figure 8 FIG. 1 is a diagram showing simulation results of a structure in which a coil array according to an embodiment of the present application is applied in a three-dimensional structure.

[0038] Figure 9 FIG. 1 is a diagram showing simulation results of a structure in which a coil array according to an embodiment of the present application is applied in a three-dimensional structure.

[0039] Figure 10 FIG. 1 is a schematic cross-sectional view schematically illustrating a coil array having a planar coil structure and applying an embodiment of the present application.

[0040] Figure 11 FIG. 1 is a schematic cross-sectional view schematically illustrating a coil array having a planar coil structure and applying the coil array according to an embodiment of the present application in a three-dimensional structure.

[0041] Figure 12 FIG. 1 is a diagram showing simulation results of a structure having a planar coil structure and three-dimensionally applying a coil array according to an embodiment of the present application. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings. Figure 1 The advantages and features of the present application and the methods for achieving them will become clear with the detailed description of the embodiments. However, the present application is not limited to the embodiments described herein and may be embodied in different forms. On the contrary, the embodiments introduced here are provided to make the disclosure thorough and complete and to enable the ideas of the present application to be fully conveyed to those skilled in the art. The present application is defined only by the scope of the claims. On the other hand, throughout the specification, the same figure numerals refer to the same components.

[0043] The terms used in this specification are used to illustrate the embodiments and are not intended to limit this application. In this specification, as long as it is not specifically mentioned in the sentence, the singular also includes the plural. The "comprises" and / or "comprising" used in the specification do not exclude the existence or addition of one or more other constituent elements, steps, actions and / or elements of the mentioned constituent elements, steps, actions and / or components. In addition, since it is based on the preferred embodiment, the figure numerals prompted according to the order of description are not necessarily limited to that order. Moreover, in this specification, it is meant that the mention of a certain component or part or components other than it is not excluded, and other components or parts may be added if necessary.

[0044] The descriptions and examples provided in this specification are provided for illustrative purposes only and are not intended to limit the scope of the appended claims. This specification should be considered to illustrate the principles of this application and is not intended to limit the claims and / or the spirit and scope of this application. Persons skilled in the art may modify this application for specific applications.

[0045] In addition, the embodiments described in this specification will be described with reference to the cross-sectional views and / or top views that serve as ideal example figures of the present application. In the accompanying drawings, the thickness of the membrane and the region is exaggerated in order to effectively illustrate the technical content. Therefore, the form of the example figure may be deformed due to manufacturing technology and / or tolerances, etc. Therefore, the embodiments of the present application are not limited to the specific forms shown in the drawings, but also include changes in the form generated according to the manufacturing process. For example, the etching area shown as a right angle can be a form with a circular shape or a preset curvature. Therefore, the area shown in the drawings has a schematic attribute, and the appearance of the area shown in the drawings is used to illustrate the specific form of the component area, and is not used to limit the scope of the invention.

[0046] Figure 1 1 is a schematic cross-sectional view schematically illustrating the current flow and magnetic flux size of a coil array according to an embodiment of the present application. Figure 1 As shown, the coil array 100 according to one embodiment of the present application includes a first coil array 110 and a second coil array 120 .

[0047] The first coil array 110 and the second coil array 120 are spaced apart by a predetermined distance, forming a mirror image in the direction of separation. That is, with the x-axis as the axis of symmetry, the first coil array 110 and the second coil array 120 are mirror images. The term "mirror image" refers to structures that correspond to each other with the axis of symmetry as the center, meaning that the structures are like looking in a mirror.

[0048] At this time, the first coil array 110 includes at least one first half cycle and at least one second half cycle formed adjacent to each other. The first half cycle 150 and the second half cycle 160 are formed into a cycle, and each spatial cycle λ S A periodic pattern of repeating identical structures is formed. First half-cycle 150 includes at least two coils with different current flow directions, and the first and second half-cycles are mirror images in adjacent directions. That is, first half-cycle 150 is a mirror image of second half-cycle 160, with the z-axis as its axis of symmetry.

[0049] If reference Figure 1The first coil array 110 and the second coil array 120 are separated by a predetermined distance along the z-axis, i.e., by an air gap d. The distance between the first coil array 110 and the second coil array 120 can be set by magnetic flux or other components to be realized by the coil arrays, and can be set by the user.

[0050] The first half cycle 150 includes at least two coils whose current flows in directions different from each other. Figure 1 The first half cycle 150 is shown as an embodiment formed of multiple layers, but this is only an example. The first half cycle 150 may include at least two coils with different current flow directions. The current flow directions of the two coils may be opposite to each other. The current of one coil may flow in the opposite direction. Figure 1 The current in the other coil can flow in the direction of the plane (+y direction). Figure 1 When the current flows in one direction in the coil, a magnetic field is formed in the coil. Figure 1 When the current flows in the plane of the coil, a magnetic field is formed in the clockwise direction of the coil. Figure 1 When the out-of-plane flow is generated, a magnetic field is formed in the counterclockwise direction of the winding coil. The two coils included in the first half cycle 150 can be Figure 1 The coils included in the first upper layer of the first half cycle 150 are formed toward the second coil array 120 by the counterclockwise magnetic field generated by the coil on the right side with current flowing out of the plane and the clockwise magnetic field generated by the coil on the left side with current flowing in the plane. This strengthens the magnetic flux.

[0051] Second half-cycle 160, a mirror image of first half-cycle 150, differs from the first half-cycle in that it forms coils with in-plane current flow on the right side and out-of-plane current flow on the left side. Because the current flows in opposite directions between the coils in second half-cycle 160 and first half-cycle 150, the magnetic field between the two coils is formed in the opposite direction of second coil array 120, intensifying the magnetic flux.

[0052] The first coil array 110 and the second coil array 120 may be formed in multiple layers. They may be formed in multiple layers of two or more. Figure 1 The figure shows four layers as an example, but is not limited to this. The number of layers can be less or include additional layers as needed.

[0053] The first coil array 110 and the second coil array 120 may be formed in three layers.

[0054] The first layer of first half-cycle 150 can include at least two coils with current flowing in different directions. For example, the left coil of the first layer exhibits current flowing in-plane, while the right coil exhibits current flowing out-of-plane. The second layer of first half-cycle 150 has coils with current flowing in the same direction as the first layer, but is located relatively further outboard of the first layer's coils.

[0055] Furthermore, the current flows in the third and second layers of the first half-cycle 150 in opposite directions. Specifically, the left coil of the third layer shows current flowing out of the plane, while the right coil shows current flowing in the plane. Furthermore, the coils of the third layer are positioned relatively inward of the coils of the second layer. The current flows in the fourth layer of the first half-cycle 150 in the same direction as the coils of the third layer, but are positioned relatively outward of the coils of the third layer.

[0056] Alternatively, the first coil array 110 and the second coil array 120 may be formed in a lower layer and an upper layer. Figure 1 The first layer, the upper layer can correspond to Figure 1 The third layer can be composed of only the first and third layers without including the second and fourth layers.

[0057] on the other hand, Figure 1 The current directions of the first half cycle 150 and the second half cycle 160 are shown for illustration purposes only and are not limited thereto. The current directions may have the above relationship as they change over time, and the current direction in the coil may change over time. Figure 1 The relative positions of the coils or the number of coils in each layer are shown for illustration purposes only and are not limited thereto. The positions of the coils or the number of coils may be changed without departing from the spirit of the present application.

[0058] The first coil array 110 can be formed with a coil structure having the above-mentioned current distribution. The first coil array 110 and the second coil array 120 are exemplarily shown as a stacked coil structure 130, or a horizontally stacked coil structure 140 and a vertically stacked coil structure 145, but are not limited thereto. As required, a three-dimensional stacked structure can be replaced with a coil structure having a current distribution. Figure 1 The current distribution is shown as a planar structure alternative.

[0059] The coil array 100 according to one embodiment of the present application has a structure in which the magnetic flux is strengthened in one direction and canceled in other directions. Figure 1In the z-axis direction, the magnetic flux of the first coil array 110 and the second coil array 120 is enhanced toward the side facing each other, while in other directions, the magnetic flux is relatively canceled or becomes almost negligible. Therefore, the coil array 100 according to the present application can minimize the leakage magnetic field outside the region of interest.

[0060] Figure 2 1 is a schematic cross-sectional view of a coil array according to an embodiment of the present application, illustrating two phase-difference coil array groups.

[0061] If reference Figure 2 According to an embodiment of the present application, coil array 200 includes a coil array group 201 for phase A and a coil array group 202 for phase B, which are 90 degrees out of phase with each other. The two coil array groups can have different phases or the same phase. Coil array 200 is arranged in an alternating manner, with coil array group 202 for phase B positioned between coil array group 201 for phase A.

[0062] Therefore, the coil array group 201 for phase A and the coil array group 202 for phase B are sequentially supplied with currents that change with time according to the phase difference, thereby forming a moving magnetic field (not shown in the figure). If this moving electromagnetic field is utilized, the same effect as the stator of an electromagnetic machine can be obtained. On the other hand, in Figure 2 In the figure, the phases of the coil array 200 are shown as two phases, but it is not limited to this. Groups can be added as needed and alternately overlapped in sequence to realize a coil array with three or more phases.

[0063] Figure 3 is a schematic cross-sectional view schematically illustrating the current flow and magnetic flux size of a coil array according to an embodiment of the present application.

[0064] like Figure 3 As shown, in the coil array 300 according to the embodiment of the present application, it includes a first coil array 310 and a second coil array 320. At this time, the second coil array 320 and Figure 1 The coil arrays shown and described in detail in FIG. 3 are the same, but the first coil array 310 may be Figure 3 The Halbach Array configuration as a special coil array structure is shown and described in detail in FIG. In addition, for this coil array 300, the magnetic flux between the first coil array 310 and the second coil array 320 can be strengthened, and the external magnetic flux can be reduced to a relatively negligible level or canceled out. On the other hand, Figure 3In the figure, the first coil array 310 is illustrated as a Halbach array, but the invention is not limited thereto. The second coil array 320 can be used as a Halbach array as needed, or both the first coil array 310 and the second coil array 320 can be used as Halbach arrays.

[0065] Figure 4 3D is a schematic diagram of a coil array structure according to an embodiment of the present application.

[0066] like Figure 4 As shown, in coil array 400 according to an embodiment of the present application, first coil array 410 and second coil array 420 repeat the same structure at each spatial period along the x-axis. Furthermore, within the periodic structure, first coil array 410 and second coil array 420 extend in the direction of current flow (i.e., the y-axis), resulting in a segmented toroidal or solenoid current distribution.

[0067] Furthermore, a mobile electromagnetic machine (not shown) including a coil array 400 according to an embodiment of the present application can be implemented as an ironless structure or with a minimal iron core. Therefore, using a minimal iron core in the electromagnetic machine can maximize efficiency, minimize weight and size, and potentially reduce core losses caused by the use of an iron core.

[0068] In addition, the magnetic field generated by the coil array according to the embodiment of the present application changes periodically in one direction. Even without using an iron core, all these properties can be achieved by using only the coil array according to the embodiment of the present application. In particular, the magnetic field generated by the coil array according to the embodiment of the present application It can be approximated as a sine wave as follows.

[0069]

Mathematical formula 1

[0070]

[0071] Among them, λ S is the spatial period of the magnetic field. For mobile electromagnetic machinery, λ S is the spatial period of the fixed coil (unit: m), the spatial period of the mover coil can be expressed as λ m This is one of the design elements of the stator coils of an electromagnetic machine. The stator coils can comprise multiple periods of the electromagnetic machine. That is, the superscript (A) indicates coil (phase) A. The magnetic flux density is mostly intensified in the z-axis direction.

[0072] On the other hand, the other directional components of the magnetic flux density are assumed to be negligible. For example, in the coil array of one embodiment of the present application, the other directional components are particularly negligible in the space between the complementary coil arrays. The stator magnetic field can be expressed as the following mathematical formula, which is proportional to the stator current.

[0073]

Mathematical formula 2

[0074] B0=k S I S In addition, for coil (phase) B, the coil array according to the embodiment of the present application can generate different magnetic flux. Coil (phase) B is physically moved by λ compared to coil (phase) A. S / 4, magnetic field of coil (phase) B It can be expressed as the following formula.

[0075]

Mathematical formula 3

[0076]

[0077] Where, kS is the propagation vector of the first coil array (stator), k S =2π / λ S The propagation vector of the second coil array (motor) can be expressed as k m =2π / λ m express.

[0078] The analysis of the coil array according to the embodiment of the present application is performed exemplarily using a two-phase coil structure. Even if this two-phase coil structure is assumed, the concept is the same and the generality is not impaired. This analysis can also be extended to a multi-phase coil structure, such as a three-phase coil structure, and the analysis results and conclusions can also be applied to the multi-phase system in the same way. If necessary, the difference between the two-phase system and the three-phase system can be mentioned. On the other hand, in the case of a three-phase system, three groups of coils called U, V and W coils are generally required. Compared with the U coil, the spatial phase shift of the V and W coils is λ S / 3, 2λ S / 3.

[0079] In the coil array according to the embodiment of the present application, the magnetic field generated by the complementary first coil array and the second coil array has the following characteristics:

[0080] The magnetic field between the first coil array and the second coil array is strengthened toward one side in the z-axis direction (ie, between the coil arrays), and is almost canceled toward the other side (ie, outside the coil arrays) except for the strengthened magnetic field.

[0081] On the other hand, the magnetic fields generated in coil (phase) A and coil (phase) B of the coil array according to the embodiment of the present application are generated independently and overlap. In addition, coil A and coil B are electrically driven with a 90-degree phase difference, generating a moving magnetic field. The magnetic field B modulated by the overlap of coil A and coil B is Z (x) can be expressed as the following formula.

[0082]

Mathematical formula 4

[0083]

[0084] On the other hand, referring to Math. 1 and Math. 3, Math. 4 can be expressed as follows.

[0085]

Mathematical formula 5

[0086] B Z (x)=B0(k S x)cos(ω S t)+B0(k S x)sin(ω S t)=B0cos(k S x-ω S t)

[0087] Among them, ω S is the period of the first coil array current, and its relationship with the first coil array current frequency fs is ω S =2πf S .

[0088] The waveform pattern of the magnetic flux density as described above is related to the speed v as follows S The form of a moving magnetic field that moves in both directions along the x-axis.

[0089]

Mathematical formula 6

[0090]

[0091] In the coil pair, the direction of the ripple pattern moving in the negative x-axis direction can be changed by changing the sign of the current or by time modulation.

[0092] An electromagnetic machine can be manufactured by supplying current through a stator coil including a coil array according to an embodiment of the present application to generate a magnetic field, and providing a mover along the coil through which current can flow perpendicularly to the magnetic field.

[0093] A mobile electromagnetic machine can be constructed using the coil array described above. According to one embodiment of the present application, the mobile electromagnetic machine may include a stator and a mover, and the stator may include a first coil array. The first coil array may include at least one first half-cycle and at least one second half-cycle formed adjacent to each other. The first half-cycle may include at least two coils with different current flow directions, and the first half-cycle and the second half-cycle may have mirror images in adjacent directions. A detailed description of the coil array included in the mobile electromagnetic machine according to one embodiment of the present application corresponds to the detailed description of the coil array according to the embodiment of the present application described above, and repeated descriptions are omitted below.

[0094] Alternatively, the stator may further include a second coil array, which is formed at a preset interval from the first coil array and has a mirror image in the direction of the interval, and the mover may be formed between the first coil array and the second coil array.

[0095] Alternatively, the mover may include a second coil array, which is formed at a predetermined distance from the first coil array and has a mirror image in the direction of separation. That is, the first coil array and the second coil array of the coil array according to the embodiment of the application can be the stator or the mover, respectively.

[0096] In addition, the mover may be a rotor.

[0097] Assume that the current can flow in both directions along the y-axis through a wire, and that the mover is allowed to move along the x-axis. If the amount of current flowing through the wire is called i, then the Lorentz force δF x (x) can be expressed as follows relative to the wire length l (or l is the length of the area where the magnetic flux is preset).

[0098]

Mathematical formula 7

[0099] δF x (x) = lI y (x)B Z (x)

[0100] Among them, I y (x) is the current flowing from position x to direction y. Through the function of x, an array of wires can be formed for current flow, and in particular, the current distributed on the mover has the same (spatial) period as the stator.

[0101]

Mathematical formula 8

[0102]

[0103] Here, xm may be the x-direction coordinate of the second coil array (mover), and the x-direction coordinate of the first array (stator) may be represented by xS.

[0104] Therefore, this means that current is generated on the mover, which can move relatively within the mover (or rotor). In principle, a sinusoidal current distribution can be achieved by stacking extremely small circuit loops. The number of wires per unit length can be expressed as follows.

[0105]

Mathematical formula 9

[0106]

[0107] When a small current i flows through a wire, it can be expressed as the following formula.

[0108]

Mathematical formula 10

[0109] I0=n0I

[0110] It is not easy to achieve a sinusoidal current density distribution.

[0111]

Mathematical formula 11

[0112]

[0113] When h(x m )=1, When h(x m )=0.

[0114] Among them, h(x m ) is a period λ S For example, φ is an arbitrary initial phase value of the mover.

[0115] Figure 5 FIG. 1 is a conceptual diagram schematically illustrating the interaction between a magnetic field and an electric current generated by a coil array structure according to an embodiment of the present application.

[0116] If reference Figure 5 The Lorentz force generated in the current-carrying wire due to the interaction between the magnetic field generated by the coil array according to one embodiment of the present application and the current can be expressed along the x-axis as follows. Meanwhile, the force generated in the stator along the x-axis is the same in magnitude but occurs in opposite directions in each half-cycle.

[0117]

Mathematical formula 12

[0118] δF x (x) = lB S I m cos{k Sx S -ω S t}cos{k S (x S -v m t)-ω m t-φ}

[0119] Assume x m Relative to x S Speed v m Move. The relationship is as follows.

[0120]

Mathematical formula 13

[0121] x m =x S -v m t

[0122] The force per cycle can be calculated as follows.

[0123]

Mathematical formula 14

[0124] δF x (x S )=lB S H m cos{k S x S -ω S t}cos{k S (x S -v m t)-ω m t-φ}

[0125] δF x (x S )=lB S I m cos{k S x S -ω S t}cos{k S x S -(ω m +k S v m )t-φ}

[0126] Mathematical formula 14 can be organized as follows.

[0127]

Mathematical formula 15

[0128]

[0129] The first term of Equation 15 varies rapidly in both space and time. It is independent of time, and if the force is accumulated over many spatial periods, the average value vanishes. Each spatial period λ SThe force (M is large enough and combined over M cycles) can be expressed as the following formula.

[0130]

Mathematical formula 16

[0131]

[0132] The period-averaged force can be calculated for any periodic current distribution. The harmonic components of the same Fourier series expansion are generated with a current average value of zero, thus showing the same results.

[0133] The periodic relationship of the current driven in the mover is shown in the following formula.

[0134]

Mathematical formula 17

[0135] (ω m +k S ν m )=ω S

[0136] In other words, the moving magnetic field generated in the mover—the resulting magnetic field—is synchronized with the moving magnetic field generated by the stator. Because the spatial periods of the mover and stator are identical, their magnetic poles attract each other, resulting in synchronized magnetic flux paths and a field lock.

[0137] If the rotor and stator are magnetically connected, the rotor (rotor) is in equilibrium, and the average magnetic force between the rotor and stator is 0. φ represents the electric field phase difference, which is proportional to the deviation from the equilibrium position between the rotor and stator.

[0138]

Mathematical formula 18

[0139]

[0140] When φ = 0, the external force or torque remains constant, and the magnetic flux connection keeps the mover in its equilibrium position. If the mover moves from its equilibrium state, a magnetic force is generated, causing the mover to move to its equilibrium position. Conversely, if an external force or torque is applied to the mover, the magnetic force generated by the pull of the opposite magnetic pole corresponds to the external force. In this case, the mover's position changes in response to the external force. The magnitude of the reaction force is proportional to the product of the stator current and the mover current, and the total magnetic force or torque is proportional to the number of spatial periods.

[0141] If cosφ is positive and predetermined, the interaction between the stator and the mover (or rotor) generates a steady-state force in the mover, which counteracts friction and propels the mover. At this point, the stator and mover power supply mechanism maintains slow acceleration or a steady state relative to friction, supplying power to move the mover. Maximum force occurs when φ = 0.

[0142] When the mobile electromagnetic machine according to one embodiment of the present application is used as a motor, the conditions shown in the following formula are maintained during current supply.

[0143]

Mathematical formula 19

[0144] cos{(ω S -ω m +k S v m )t-φ}≥0

[0145] The condition of cosφ < 0 is a steady-state condition when the mover (rotor) is pushed by an external force. A negative force means that the external force is performing work. This is the case when the mobile electromagnetic machine according to one embodiment of the present application operates as a generator. Current flows through the mover coils, generating electricity.

[0146] In the case of steady-state force, the mover moves at a speed v m moving, the current moves at the same speed v as the magnetic field generated by the stator S When the mover and stator are driven at the same frequency and there is no external force, the mover remains in a fixed position. However, if the mover and stator are driven at different frequencies and the magnetic fields move in the same direction, the mover (rotor) axis moves at v S -v m When the field rotation (FieldRotation) is in the opposite direction, the rotor (rotor) shaft rotation speed is the sum of the stator field rotation speed and the rotor field rotation speed. This allows for rapid rotation.

[0147] The magnetic field in the stator moves at a speed v S When moving, it can be expressed as the following formula.

[0148]

Mathematical formula 20

[0149] v S =ω S / k S

[0150] When a steady-state force is generated in the mover, the mover (rotor) moves at an extremely slow acceleration or the force is balanced with an external force, in which case it moves at a constant speed.

[0151] Figure 6 FIG. 1 is a schematic cross-sectional view schematically illustrating a coil array having stacked coils and applying the coil array according to an embodiment of the present application in a horizontal direction.

[0152] If reference Figure 6According to an embodiment of the present application, coil array 600 comprises stacked coils, forming a periodic structure along the x-axis. Coil array 600 comprises a first coil array 610 and a second coil array 620 separated by a predetermined interval along the z-axis. Furthermore, the magnetic flux density is enhanced in the direction between first coil array 610 and second coil array 620. Except for the mutually facing directions within first coil array 610 and second coil array 620, the magnetic flux density is offset, minimizing external leakage magnetic fields.

[0153] Figure 7 FIG. 1 is a schematic cross-sectional view schematically illustrating a coil array having a stacked coil and applying the coil array according to an embodiment of the present application in a three-dimensional structure.

[0154] If reference Figure 7 According to an embodiment of the present application, the coil array 700 has a stacked coil, which is embodied in a circular shape. At this time, the coil array 700 according to an embodiment of the present application is separated by a preset interval in the radial direction, and the first coil array 710 and the second coil array 720 repeat the same structure in each spatial period along the tangential direction. In addition, the first coil array 710 and the second coil array 720 are embodied in a complementary manner. That is, the first coil array 710 can be regarded as having a mirror image of the current distribution of the second coil array 720 based on the tangential direction. In addition, the first coil array 710 and the second coil array 720 configured in a circular shape have a magnetic flux density that is enhanced toward the side between them in the radial direction, and the magnetic flux density is offset toward the other side outside them.

[0155] On the other hand, the first coil array 710 and the second coil array 720 are shown as being arranged on a circumference, being shorter and being of almost the same size, but are not limited thereto. The size of the coil array on the inner circumference may be reduced, or the size of the coil array on the outer circumference may be increased as needed without compromising the concept of the present application.

[0156] Figure 8 FIG. 1 is a diagram showing simulation results of a structure in which a coil array according to an embodiment of the present application is applied in a three-dimensional structure.

[0157] This simulation result graph was calculated using a python program based on the Biot-Savart law. Figure 8 , showing that Figure 7The results are obtained near the middle of the gap between the first coil array 710 and the second coil array 720 of the coil array 700. Therefore, at the center of the gap between the first coil array 710 and the second coil array 720, the magnetic flux is enhanced in the radial direction, while there is relatively little magnetic flux in the axial or tangential direction.

[0158] Figure 9 FIG. 1 is a diagram showing simulation results of a structure in which a coil array according to an embodiment of the present application is applied in a three-dimensional structure.

[0159] If reference Figure 9 , showing that from Figure 7 The results shown for coil array 700, starting with first coil array 710 and second coil array 720, were obtained near the outside of a region of interest (ROI) half the size of the gap. This confirms that there is virtually no leakage magnetic flux in all directions. The region of interest, however, refers to the interior of the region, including first coil array 710 and second coil array 720.

[0160] Figure 10 FIG. 1 is a schematic cross-sectional view schematically illustrating a coil array having a planar coil structure and applying an embodiment of the present application.

[0161] If reference Figure 10 The coil array 1000 of the embodiment of the present application periodically forms a planar coil structure in the x-axis and z-axis directions. At this time, the magnetic field in the + direction of the coil array 1000 in the z-axis is strengthened, while the magnetic field in the - direction is relatively weakened.

[0162] Figure 11 FIG. 1 is a schematic cross-sectional view schematically illustrating a coil array having a planar coil structure and applying the coil array according to an embodiment of the present application in a three-dimensional structure.

[0163] If reference Figure 11 The coil array 1100 of the embodiment of the present application has a planar coil structure, which is embodied in a circular shape. At this time, the coil array 1100 of the embodiment of the present application is separated by a preset interval in the radiation direction, and is embodied as a first coil array 1110 and a second coil array 1120 that complement each other.

[0164] Figure 12 This is a simulation result diagram of a structure having a planar coil structure and three-dimensionally applying the coil array according to an embodiment of the present application. Figure 12 , a strong magnetic field appears in the radiation direction near the center of the gap in the area of interest, and the magnetic field in the axial or tangential direction is offset to a negligible level. Although not shown in the figure, Figure 9 As shown in the results, it was confirmed that there was almost no leakage magnetic field outside the area of interest.

[0165] A mobile electromagnetic machine utilizing a coil array according to an embodiment of the present application strengthens the magnetic field on one side within the region of interest while virtually eliminating magnetic field leakage outside the region of interest. Furthermore, a mobile electromagnetic machine according to an embodiment of the present application uses no or minimal iron core, thereby minimizing its size and weight, reducing core losses, and overcoming performance limitations.

Claims

1. A coil array, characterized in that: include: A first coil array and a second coil array, wherein the first coil array and the second coil array are separated by a predetermined interval and have a mirror image in a separation direction, and the separation direction of the first coil array and the second coil array is a first direction; wherein, The first coil array includes at least one period, wherein a period is composed of a first half period and a second half period to form a coil array, wherein the first half period and the second half period are adjacent to each other to periodically form a coil array. The first half cycle includes at least two coils with currents flowing in different directions from each other, All of the first half cycles and all of the second half cycles have mirror images in adjacent directions, the adjacent direction of the first half cycle and the second half cycle is the second direction, and wherein the first direction is perpendicular to the second direction, The first coil array and the second coil array have a structure in which magnetic flux is enhanced in a gap region separating the first coil array and the second coil array.

2. The coil array according to claim 1, wherein: A direction of a magnetic field formed between the two coils forming the first half cycle and a direction of a magnetic field formed between the two coils forming the second half cycle are opposite to each other.

3. The coil array according to claim 1, wherein: The first half cycle includes: a first layer, the first layer comprising a first coil structure, the first coil structure comprising at least two coils with different current flow directions, the first layer being adjacent to the second coil array; a second layer, the second layer including a second coil structure having the same current flow direction as the first coil structure of the first layer but being located further outward than the first coil structure, the second layer being provided on an upper portion of the first layer; and The third layer includes a third coil structure having a current flow direction opposite to that of the second coil structure but located further inside than the second coil structure, and the third layer is provided on the upper portion of the second layer.

4. The coil array according to claim 3, characterized in that The coil array further includes: a fourth layer, the fourth layer including a fourth layer coil structure, the fourth layer coil structure having the same current flow direction as the third layer coil structure but located further outward than the third layer coil structure, the fourth layer being arranged on an upper portion of the third layer.

5. The coil array according to claim 1, wherein: The first half cycle includes: a lower layer, the lower layer including a lower layer coil structure including at least two coils with different current flow directions, the lower layer being adjacent to the second coil array; and The upper layer includes an upper layer coil structure, wherein the upper layer coil structure has a current flow direction opposite to that of the lower layer coil structure, and the upper layer is provided on an upper portion of the lower layer.

6. The coil array according to claim 1, wherein: The first coil array includes a plurality of first half periods and a plurality of second half periods, and The first half period and the second half period are periodically formed in adjacent directions.

7. The coil array according to claim 1, wherein: With respect to the first coil array or the second coil array, The length extends along the current flow direction and includes a segmented circular current distribution or a segmented solenoid current distribution.

8. The coil array according to claim 1, wherein: The coil array is formed in at least two groups, and The currents flowing in the coils constituting each group have the same phase as each other or have different phases from each other.

9. The coil array according to claim 8, characterized in that The currents flowing through the coils constituting each group have a phase difference, thereby forming a moving magnetic field.

10. A mobile electromagnetic machine, characterized in that: including a stator and a mover, and The stator includes a first coil array and a second coil array, wherein the second coil array is formed to be separated from the first coil array by a preset interval and has a mirror image in a separation direction, and the separation direction of the first coil array and the second coil array is a first direction. The first coil array includes at least one period, wherein a period is composed of a first half period and a second half period to form a coil array, wherein the first half period and the second half period are adjacent to each other to periodically form a coil array. The first half cycle includes at least two coils with currents flowing in different directions from each other, All of the first half cycles and all of the second half cycles have mirror images in adjacent directions, the adjacent direction of the first half cycle and the second half cycle is the second direction, and wherein the first direction is perpendicular to the second direction, The first coil array and the second coil array have a structure in which magnetic flux is enhanced in a gap region separating the first coil array and the second coil array.

11. The mobile electromagnetic machine according to claim 10, characterized in that: The mover is formed between the first coil array and the second coil array.

12. The mobile electromagnetic machine according to claim 10, characterized in that The first coil array and the second coil array are formed in at least two groups, and The currents flowing in the coils constituting the respective groups have phases different from each other, thereby forming a moving magnetic field.

13. The mobile electromagnetic machine according to claim 10, characterized in that The mover comprises: The second coil array is formed to be spaced apart from the first coil array by a predetermined interval and to have a mirror image in a spaced-apart direction.

14. The mobile electromagnetic machine according to claim 10, characterized in that A direction of a magnetic field formed between the two coils forming the first half cycle and a direction of a magnetic field formed between the two coils forming the second half cycle are opposite to each other.

15. The mobile electromagnetic machine according to claim 10, characterized in that The first half cycle includes: a first layer, the first layer comprising a first coil structure, the first coil structure comprising at least two coils with different current flow directions, the first layer being adjacent to the second coil array; a second layer, the second layer including a second coil structure having the same current flow direction as the first coil structure of the first layer but being located further outward than the first coil structure, the second layer being provided on an upper portion of the first layer; and The third layer includes a third coil structure having a current flow direction opposite to that of the second coil structure but located further inside than the second coil structure, and the third layer is provided on the upper portion of the second layer.

16. The mobile electromagnetic machine according to claim 10, characterized in that The first half cycle includes: a lower layer, the lower layer including a lower layer coil structure including at least two coils with different current flow directions, the lower layer being adjacent to the second coil array; and The upper layer includes an upper layer coil structure, wherein the upper layer coil structure has a current flow direction opposite to that of the lower layer coil structure, and the upper layer is provided on an upper portion of the lower layer.

17. The mobile electromagnetic machine according to claim 10, characterized in that The first coil array includes a plurality of first half periods and a plurality of second half periods, and The first half period and the second half period are periodically formed in adjacent directions.

18. The mobile electromagnetic machine according to claim 10, characterized in that As for the first coil array, The length extends along the current flow direction and includes a segmented circular current distribution or a segmented solenoid current distribution.

19. The mobile electromagnetic machine according to claim 10, characterized in that The mover is a rotor.

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