Alternating magnetic field generating device using halbach array magnet

Abstract

The present invention relates to an alternating magnetic field generating device using a Halbach array magnet, and the alternating magnetic field generating device using a Halbach array magnet, according to one aspect of the present invention, comprises: a ring gear which has a plurality of teeth formed on the outer circumferential surface thereof and rotates by receiving rotational power from an external motor; and a rotating body which has a hollow portion formed at the center and is composed of a plurality of permanent magnets that are fixedly installed on the inner circumferential surface of the ring gear and are arranged in a Halbach array, so as to generate an alternating magnetic field at the center of the hollow portion while rotating together with the ring gear.

Description

Alternating current magnetic field generator using Halbach array magnets

[0001] The present invention relates to alternating magnetic field generation technology.

[0002] A Halbach array magnet refers to a magnet array structure that strengthens the magnetic field in some directions and weakens it in others, thereby concentrating the magnetic field in a specific direction. Because Halbach array magnets can increase magnetic flux density, they are used in situations requiring strong magnetic fields, such as in electric motors or magnetic levitation systems.

[0003] Conventional alternating current (AC) magnetic field generation technology is primarily achieved by applying alternating current to a coil. Due to the nature of this technology, which generates an AC magnetic field based on the AC current while other conditions such as the coil shape remain fixed, there are limitations in finely controlling the magnitude and frequency of the magnetic field, and it is difficult to change the waveform of the AC magnetic field into various forms. In other words, conventional AC magnetic field generation technology suffers from a lack of flexibility in changing magnetic field characteristics to meet user requirements.

[0004] Furthermore, strong magnetic fields are required for various applications in science and industry, but existing alternating magnetic field generation technologies face the problem of high costs in implementing such fields.

[0005] The objective of the present invention is to solve the above problem by providing an alternating magnetic field generating device using a Halbach array magnet that generates an alternating magnetic field by rotating the Halbach array magnet and enables frequency control through adjustment of the rotation speed.

[0006] The present invention aims to enable the change in the strength and waveform of an alternating magnetic field generated by changing the shape of the iron core installed inside a Halbach array magnet.

[0007] The objectives of the present invention are not limited to those mentioned above, and other unmentioned objectives will be clearly understood from the description below.

[0008] An alternating magnetic field generating device using a Halbach array magnet according to one aspect of the present invention for achieving the aforementioned purpose comprises a ring gear having a plurality of teeth formed on its outer surface and rotating by receiving rotational power from an external motor, and a rotating body composed of a plurality of permanent magnets having a Halbach array fixedly installed on the inner surface of the ring gear and having a hollow formed in the center, which rotates together with the ring gear and generates an alternating magnetic field at the center of the hollow.

[0009] According to the alternating magnetic field generating device using a Halbach array magnet according to the present invention, the following effects can be expected.

[0010] The frequency of the alternating magnetic field can be finely controlled by adjusting the rotational speed of the motor that rotates the Halbach array magnet.

[0011] In addition, flexibility in controlling magnetic field characteristics can be improved by allowing the magnitude and waveform of the alternating magnetic field to be easily changed by changing the shape of the iron core.

[0012] Accordingly, the difficulty of having to separately manufacture or equip an AC magnetic field generator to meet specific requirements can be reduced, and the cost required to implement high-intensity magnetic fields can be lowered.

[0013] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims.

[0014] FIG. 1 is a conceptual diagram of an alternating magnetic field generating device using a Halbach array magnet according to a first embodiment of the present invention.

[0015] FIG. 2 is a graph showing the waveform of an alternating magnetic field generated by an alternating magnetic field generating device using a Halbach array magnet according to the first embodiment of the present invention.

[0016] FIG. 3 is a conceptual diagram of an alternating magnetic field generating device using a Halbach array magnet according to a second embodiment of the present invention.

[0017] FIG. 4 is a graph showing the alternating magnetic field waveform generated by an alternating magnetic field generating device using a Halbach array magnet according to a second embodiment of the present invention.

[0018] FIG. 5 is a conceptual diagram of an alternating magnetic field generating device using a Halbach array magnet according to a third embodiment of the present invention.

[0019] FIG. 6 is a graph showing the alternating magnetic field waveform generated by an alternating magnetic field generating device using a Halbach array magnet according to the third embodiment of the present invention.

[0020] FIG. 5 is a conceptual diagram of an alternating magnetic field generating device using a Halbach array magnet according to the fourth embodiment of the present invention.

[0021] FIG. 6 is a graph showing the alternating magnetic field waveform generated by an alternating magnetic field generating device using a Halbach array magnet according to the fourth embodiment of the present invention.

[0022] An alternating magnetic field generating device using a Halbach array magnet according to one aspect of the present invention for achieving the aforementioned purpose comprises a ring gear having a plurality of teeth formed on its outer surface and rotating by receiving rotational power from an external motor, and a rotating body composed of a plurality of permanent magnets having a Halbach array fixedly installed on the inner surface of the ring gear and having a hollow formed in the center, which rotates together with the ring gear and generates an alternating magnetic field at the center of the hollow.

[0023] The advantages and features of the present invention, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the claims. Meanwhile, the terms used in this specification are for describing the embodiments and are not intended to limit the present invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text.

[0024] The present invention relates to a technology for generating an alternating magnetic field through the rotation of a Halbach array magnet.

[0025] In particular, the present invention is characterized by the technical feature that the frequency, intensity, and waveform of the alternating magnetic phase can be flexibly adjusted according to the rotational speed of the Halbach array magnet and the shape of the iron core installed on the inner surface of the Halbach array magnet.

[0026] Hereinafter, an alternating current magnetic field generating device using a Halbach array magnet according to embodiments of the present invention will be described in detail with reference to the attached drawings.

[0027] Referring to FIG. 1, an alternating magnetic field generating device (10) using a Halbach array magnet according to the first embodiment of the present invention may be configured to include a ring gear (100) and a rotating body (200).

[0028] The ring gear (100) may have a plurality of teeth formed on its outer surface and rotate by receiving rotational power from an external motor.

[0029] The ring gear (100) can receive rotational power from an external motor through conventionally disclosed power transmission means such as a gearbox or belt, and since this is not a core aspect of the present invention, a detailed description will be omitted.

[0030] The rotating body (200) may be fixedly installed on the inner circumference of the ring gear (100) and composed of a plurality of permanent magnets (201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212) having a Halbach arrangement, and may have a hollow formed in the center to rotate together with the ring gear (100) and generate an alternating magnetic field in the center of the hollow.

[0031] Multiple permanent magnets (201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212) may have different magnetization directions, but opposite ones may have the same magnetization direction.

[0032] According to the above configuration, an alternating magnetic field can be generated at the center of the hollow formed inside the rotating body (200) as the rotating body (200) rotates.

[0033] To verify the generation of an alternating magnetic field according to the first embodiment, a situation was implemented in which a rotating body (200) of a Halbach array, made of permanent magnets having a radius of 15 mm and a magnetization direction as shown in FIG. 1, rotates, thereby simulating the magnetic field measured at the center of the Halbach array magnets, and obtaining a simulation result as shown in FIG. 2.

[0034] Referring to FIG. 2, the alternating magnetic field generated by the alternating magnetic field generating device (10) using a Halbach array magnet according to the first embodiment may have a constant amplitude.

[0035] At this time, the number of poles generated by the Halbach array magnet , rotational speed of the magnet , magnetic field frequency in the specimen space The relationship can be expressed by the following formula.

[0036]

[0037] According to the present invention, an alternating magnetic field is generated through the rotation of a Halbach array magnet, and the frequency of the alternating magnetic field can be easily and precisely changed by adjusting the rotation speed.

[0038] In addition, the frequency of the alternating magnetic field can be changed by changing the number of permanent magnets forming the Halbach array.

[0039] Referring to FIGS. 3, 5, and 7, the alternating magnetic field generating devices (11, 12, 13) using Halbach array magnets according to the second, third, and fourth embodiments of the present invention may further include a pair of iron cores (310, 320, 330) installed facing each other on the inner circumference of the rotating body (200) having a predetermined shape according to a preset waveform so that the alternating magnetic field generated in the hollow according to the rotation of the rotating body (200) in the alternating magnetic field generating device (10) using Halbach array magnets according to the first embodiment has a preset waveform.

[0040] Referring to FIG. 3, the first iron core (310) included in the alternating magnetic field generating device (11) using a Halbach array magnet according to the second embodiment of the present invention may be formed in a horn shape with a vertex at the end extending from the inner circumference of the rotating body (200) toward the center of the hollow, so that the waveform of the alternating magnetic field generated at the center of the hollow becomes a triangular wave.

[0041] The first iron core (310) has an arc length of 1.8 to 2.2 times the length of the inner arc of any one of the permanent magnets forming the rotating body (200), and a height from the arc to the vertex leading to the center of the hollow ( ) is the radius of the rotating body (200) It may have a ratio of 25 to 35% compared to ).

[0042] Preferably, the first iron core (310) has an arc length twice the length of the inner arc of any one of the permanent magnets forming the rotating body (200) and a height from the arc to the vertex leading to the center of the hollow ( ) is the radius of the rotating body (200) It may have a ratio of 30% compared to ).

[0043] According to the above configuration, the waveform of the alternating magnetic field generated at the center of the hollow during rotation of the rotating body (200) can be made to be a triangular wave.

[0044] To verify the generation of a triangular wave according to the second embodiment, a situation was implemented in which a rotating body (200) of a Halbach array, having a radius of 15 mm and a magnetization direction as shown in FIG. 1 and a first iron core (310) as shown in FIG. 3 attached to the inner surface, was rotated to simulate the magnetic field measured at the center, and a simulation result as shown in FIG. 4 was obtained.

[0045] Referring to Fig. 4, it can be seen that the waveform of the alternating magnetic field generated at the center of the Halbach array magnet according to the path length of the circle (Distance, 2π*15mm ≈ 94mm) is a triangular wave, and the maximum strength of the magnetic field is approximately 1.2.

[0046] Referring to FIG. 5 and FIG. 7, it can be seen that the second core (320) for generating square waves and the third core (320) for generating square waves are similar in shape, except for the difference in height from the inner surface of the rotating body (200) toward the center of the hollow, in that the end extending from the inner surface of the rotating body (200) toward the center of the hollow is formed with a curved surface corresponding to the inner surface of the rotating body (200).

[0047] In other words, the waveform of the alternating magnetic field can be made to be a square wave or a square wave depending on the height of the iron core extending from the inner circumference of the rotating body toward the center of the hollow.

[0048] Specifically, referring to FIG. 5, the outer surface of the second iron core (320) included in the alternating magnetic field generating device (12) using a Halbach array magnet according to the third embodiment of the present invention for generating a square wave is formed in a curved shape having an arc length of 1.8 to 2.2 times the inner arc length of any one permanent magnet forming the rotating body (200), and the height to the end ( ) is the radius of the rotating body (200) It may have a ratio of 45 to 55% compared to ).

[0049] Preferably, the outer surface of the second iron core (320) is formed in a curved shape having an arc length twice the length of the inner arc of any one of the permanent magnets forming the rotating body (200), and has a height to the end ( ) is the radius of the rotating body (200) It may have a ratio of 50% compared to ).

[0050] The end of the second iron core (320) is at the center of the hollow, the radius of the rotating body (200) It may have a surface of curvature according to a virtual circle having a radius of 45 to 55% of the ratio.

[0051] Preferably, the end of the second iron core (320) is at the center of the hollow, the radius of the rotating body (200) In a virtual circle having a radius that is 50% of the ratio of ) the width is the radius of the rotational body (200) It can be formed into a curved shape corresponding to an arc having a ratio of 40% compared to ).

[0052] According to the above configuration, the waveform of the alternating magnetic field generated at the center of the hollow formed in the rotating body (200) can be made to be a square wave.

[0053] To verify the generation of a square wave according to the third embodiment, a situation was implemented in which a rotating body (200) of a Halbach array, having a radius of 15 mm and a magnetization direction as shown in FIG. 1 and a second iron core (320) as shown in FIG. 5 attached to the inner surface, was rotated to simulate the magnetic field measured at the center, and a simulation result as shown in FIG. 6 was obtained.

[0054] Referring to Fig. 6, it can be seen that the waveform of the alternating magnetic field generated at the center of the Halbach array magnet according to the distance of the circle is a square wave, and the maximum strength of the magnetic field is about 0.7.

[0055] Referring to FIG. 7, the outer surface of the third iron core (330) included in the alternating magnetic field generating device (13) using a Halbach array magnet according to the fourth embodiment of the present invention for generating a sinusoidal wave is formed in a curved shape having an arc length of 1.8 to 2.2 times the inner arc length of any one permanent magnet forming the rotating body (200), and the height to the end ( ) is the radius of the rotating body (200) It may have a ratio of 15 to 25% compared to ).

[0056] Preferably, the outer surface of the third iron core (330) is formed in a curved shape having an arc length twice the length of the inner arc of any one of the permanent magnets forming the rotating body (200), and has a height to the end ( ) is the radius of the rotating body (200) It may have a ratio of 80% compared to ).

[0057] The end of the third iron core (330) is at the center of the hollow, the radius of the rotating body (200) It may have a surface of curvature according to a virtual circle having a radius of 75 to 85% of the ratio.

[0058] Preferably, the end of the third iron core (330) is at the center of the hollow, the radius of the rotating body (200) In a virtual circle having a radius that is 80% of the ratio of ) the width is the radius of the rotational body (200) It can be formed into a curved shape corresponding to an arc having a ratio of 40% compared to ).

[0059] According to the above configuration, the waveform of the alternating magnetic field generated at the center of the hollow formed in the rotating body (200) can be made to be a square wave.

[0060] To verify the generation of a square wave according to the fourth embodiment, a situation was implemented in which a rotating body (200) of a Halbach array, having a radius of 15 mm and a magnetization direction as shown in FIG. 1 and a third iron core (330) as shown in FIG. 7 attached to the inner surface, was rotated to simulate the magnetic field measured at the center, and a simulation result as shown in FIG. 8 was obtained.

[0061] Referring to Fig. 8, it can be seen that the waveform of the alternating magnetic field generated at the center of the Halbach array magnet according to the distance of the circle is a sinusoidal wave, and the maximum strength of the magnetic field is about 0.6.

[0062] According to the present invention, it is possible to implement an alternating magnetic field having a waveform of a triangular wave, a square wave, or a square wave depending on the shape of the iron core installed within the magnet of the Halbach array.

[0063] In addition, referring to Figures 4, 6, and 8, it was confirmed that the maximum strength of the alternating magnetic field increases from 0.6 to 0.7 and 1.2 as the waveform changes from a sinusoidal wave to a square wave and then to a triangular wave, and that by installing iron cores of different shapes for each waveform, not only the waveform of the alternating magnetic field but also the magnetic field strength can be changed.

[0064] To summarize, according to the present invention, an alternating magnetic field capable of finely changing the frequency according to the rotation speed can be generated through the rotation of a Halbach array magnet.

[0065] In addition, by installing an iron core having a preset shape for the waveform on the inner surface of the Halbach array magnet, it is possible to implement various waveforms and adjust the frequency intensity.

[0066] In other words, according to the present invention, the characteristics of the alternating magnetic field can be flexibly changed to suit the needs of the user.

[0067] Accordingly, the advantage of reducing the effort and cost required to provide separate alternating magnetic field generators for each characteristic or to implement high-intensity alternating magnetic fields can be expected.

[0068] A person skilled in the art to which the present invention pertains will understand that the present invention may be implemented in other specific forms without altering its technical concept or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the claims and their equivalents should be interpreted as being included within the scope of the present invention.

[0069] The present invention relates to alternating magnetic field generation technology.

Claims

1. A ring gear having a plurality of teeth formed on its outer surface that rotates by receiving rotational power from an external motor; and An alternating magnetic field generating device using a Halbach array magnet, comprising: a rotating body that is fixedly installed on the inner circumference of the ring gear and is composed of a plurality of permanent magnets having a Halbach array, has a hollow formed in the center, rotates together with the ring gear, and generates an alternating magnetic field at the center of the hollow.

2. In Paragraph 1, The above permanent magnet is Those that have different magnetization directions, but have the same magnetization direction when facing each other. Alternating current magnetic field generator using a Halbach array magnet.

3. In Paragraph 1, An alternating magnetic field generating device using a Halbach array magnet, further comprising: a pair of iron cores installed facing each other on the inner circumference of the rotating body, having a predetermined shape according to a preset waveform so that the alternating magnetic field generated in the hollow according to the rotation of the rotating body has a preset waveform.

4. In Paragraph 3, The above iron core is The end extending from the inner circumference of the above-mentioned rotating body toward the center of the above-mentioned hollow is formed in a horn shape having a vertex, thereby causing the waveform of the above-mentioned alternating magnetic field to become a triangular wave. Alternating current magnetic field generator using a Halbach array magnet.

5. In Paragraph 3, The above iron core is The end extending from the inner circumferential surface of the above-mentioned rotating body toward the center of the above-mentioned hollow is formed in a shape having a curved surface corresponding to the inner circumferential surface of the above-mentioned rotating body. Alternating current magnetic field generator using a Halbach array magnet.

6. In Paragraph 5, The above iron core is Making the waveform of the alternating magnetic field a square wave or a regular wave according to the height from the inner circumference of the rotating body toward the center of the hollow Alternating current magnetic field generator using a Halbach array magnet.

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