Hybrid damping torsion magnet

Abstract

This invention provides a hybrid damped torsion pendulum magnet, applicable to the technical field of accelerator insert devices, comprising pole heads, permanent magnets, and excitation coils. Multiple pole heads extend along a first direction in two parallel rows. Each row of pole heads has a magnetic gap with the other row in a second direction. The root cross-sectional area of ​​each pole head near the magnetic gap is smaller than the root cross-sectional area at the other end. Each pole head has opposite polarity to the other pole head with the magnetic gap. The polarization direction of each row of pole heads alternates along the first direction. Each pair of permanent magnets is disposed within a recessed space at the end of each pole head near the magnetic gap. Each pair of permanent magnets includes a first permanent magnet and a second permanent magnet, which have opposite polarization directions. An excitation coil is wound around each pole head and encloses the permanent magnets.

Description

Technical Field

[0001] This invention relates to the technical field of nuclear science and accelerator insert devices, and more particularly to a hybrid damped torsion pendulum magnet. Background Technology

[0002] Damping wigglers (DWs), as insertion devices in colliders or synchrotron radiation sources, are used to enhance the synchrotron radiation effect of synchrotron radiation devices, thereby shortening the damping time. Peak magnetic field strength is one of the core factors evaluating the performance of damping wigglers. However, there is often a trade-off between increasing peak magnetic field strength and ensuring stable device operation. Summary of the Invention

[0003] In view of the above problems, the present invention provides a hybrid damping torsion magnet.

[0004] According to a first aspect of the invention, a hybrid damping torsion magnet is provided, comprising a plurality of poles, a plurality of pairs of permanent magnets, and an excitation coil. Multiple pole heads are arranged in a periodic pattern along a first direction and distributed in two parallel rows. Each row of pole heads has a magnetic gap with the other row of pole heads in a second direction intersecting the first direction. The root cross-sectional area of ​​each pole head near the magnetic gap is smaller than the root cross-sectional area of ​​the pole head away from the magnetic gap. Each pole head has opposite polarity to the other pole head with a magnetic gap in the second direction, and the polarization direction of each row of pole heads alternates along the first direction. Each pair of permanent magnets is symmetrically arranged in the recessed space at the end of each pole head near the magnetic gap. Each pair of permanent magnets includes a first permanent magnet and a second permanent magnet. The first permanent magnet and the second permanent magnet have opposite polarization directions. The first permanent magnet on the first pole head and the second permanent magnet on the adjacent second pole head, as well as the second permanent magnet on the opposite third pole head, all have opposite polarization directions in the first direction. An excitation coil is wound around each pole head and wraps around each pair of permanent magnets.

[0005] According to an embodiment of the present invention, the first permanent magnet and the second permanent magnet are respectively located on opposite sides of each pole head along a third direction, the third direction being perpendicular to the plane containing the first direction and the second direction.

[0006] According to an embodiment of the present invention, the polarization directions of the first permanent magnet and the second permanent magnet extend along the second direction or the third direction.

[0007] According to an embodiment of the present invention, the end of each pole near the magnetic gap has a desired structure, the desired structure including: a structure having a recessed space that accommodates each pair of permanent magnets.

[0008] According to an embodiment of the present invention, the first permanent magnet and the second permanent magnet include any of the following structures: a stepped structure and a triangular structure.

[0009] According to an embodiment of the present invention, the peak magnetic field strength of the hybrid damping torsion magnet is positively correlated with the volume of the first permanent magnet and the second permanent magnet.

[0010] According to an embodiment of the present invention, the peak magnetic field strength of the hybrid damping torsion pendulum magnet ranges from 1.9T to 2.1T.

[0011] According to an embodiment of the present invention, the magnetic gap between the multiple pole heads includes 30mm to 50mm.

[0012] According to an embodiment of the present invention, the length of the arrangement period of the plurality of pole heads in the first direction is the distance between the sidewalls of the two closest pole heads in the same direction when the polarization directions of the first permanent magnets on the plurality of pole heads are the same, and the length of the arrangement period is greater than or equal to 400 mm.

[0013] According to an embodiment of the present invention, the total length of the hybrid damping torsion magnet is an integer multiple of the arrangement period length.

[0014] According to an embodiment of the present invention, a hybrid damped torsion magnet is provided. This damped torsion magnet avoids the method of increasing the excitation current to enhance the peak magnetic field strength by forming a recessed space at the end of the pole head and arranging a permanent magnet within the recessed space. The permanent magnet is positioned inside the excitation coil, and each pair of permanent magnets is located in the recessed space at the end of each pole head near the magnetic gap. Each pair of permanent magnets includes a first permanent magnet and a second permanent magnet, which have opposite polarization directions. Furthermore, the first and second permanent magnets, as well as their adjacent permanent magnets, have opposite polarization directions in both the first and second directions. This structure enhances the peak magnetic field strength while avoiding excessive processing of the overall device structure, improving magnetic field quality. Additionally, the permanent magnets avoid the core area irradiated by synchrotron radiation sources, reducing the risk of demagnetization. Attached Figure Description

[0015] The above-mentioned contents, as well as other objects, features and advantages of the present invention, will become clearer from the following description of embodiments of the present invention with reference to the accompanying drawings.

[0016] Figure 1 The magnetic field strength diagram of the damped torsion magnet in the super taucour device is shown.

[0017] Figure 2 A schematic diagram of a damped torsion magnet with its poles beveled is shown.

[0018] Figure 3The magnetic field strength diagram is shown for the poles of the damped torsion magnet in the super taucour device with beveled ends.

[0019] Figure 4 A side view of the hybrid damping torsion magnet according to an embodiment of the present invention is shown.

[0020] Figure 5 A front view structural schematic diagram of a hybrid damping torsion magnet according to an embodiment of the present invention is shown.

[0021] Figure 6 A front view schematic diagram of a hybrid damping torsion magnet (excitation coil not shown) according to an embodiment of the present invention is shown.

[0022] Figure 7 The diagram shows a side view of a hybrid damping torsion magnet with a triangular permanent magnet structure in an embodiment of the present invention.

[0023] Figure 8 A comparison diagram of the magnetic field strength of a permanent magnet with polarization direction along the second direction and a damped torsion magnet without a permanent magnet is shown in the embodiment of the present invention.

[0024] Figure 9 The diagram shows a comparison of the magnetic field strength of a permanent magnet with polarization direction along a third direction and a damped torsion magnet without a permanent magnet in an embodiment of the present invention.

[0025] Figure 10 A comparison diagram of the magnetic field strength of a hybrid damped torsion magnet and a damped torsion magnet without permanent magnets, according to an embodiment of the present invention, is shown.

[0026] Figure 11 A comparison diagram of the magnetic field strength of the permanent magnet of the hybrid damping torsion pendulum magnet according to an embodiment of the present invention at different volumes is shown. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0028] The endpoints and any values ​​of the ranges disclosed in this invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this invention.

[0029] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0030] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0031] In the description of this invention, it should be understood that the terms "longitudinal", "length", "circumferential", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the subsystem or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] Similarly, to simplify the invention and aid in understanding one or more of the various disclosed aspects, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together into a single embodiment, figure, or description thereof. The use of terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicates that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0033] Damping wigglers (DWs) enhance the synchrotron radiation effect by increasing the peak magnetic field strength, thereby shortening the damping time of the device. Based on room-temperature magnet technology, achieving a high peak magnetic field strength within a limited space using damping wigglers is one of the key challenges in improving the performance of storage ring insertion devices.

[0034] Currently, increasing the excitation current can be used to improve the peak magnetic field strength, such as by increasing the number of turns in the excitation coil. In the DAFNE collider, with a magnetic gap of 37 mm and a pole arrangement period length of 640 mm, the excitation ampere-turns need to be increased to 55,000 AT to achieve the design parameter of a peak magnetic field strength of 1.73 T. However, increasing the excitation current can cause magnetic saturation of the poles, resulting in a decrease in magnetic field quality and affecting the beam lifetime of the device. In the first third-generation collider, SuperKEKB, the peak magnetic field strength was improved by increasing the total length of the damped torsion magnets. With a magnetic gap of 110 mm, the peak magnetic field strength was only 0.98 T. To meet the design requirement of the predetermined damping time, the total length needed to be increased to 280 meters. This not only increased the space for placing the devices but also increased the number of magnet power supplies, thus increasing costs. The VEPP-4M collider improved the peak magnetic field strength of the damped torsion magnets by adding permanent magnets on the longitudinal outer side. With a magnetic gap of 30mm and a pole arrangement period of 280mm, the peak magnetic field strength of VEPP-4M reaches 1.9T. However, this addition method will cause invasive damage to the longitudinal structure and magnetic field shape of the original magnetic poles, reduce the placement space of the original excitation coil, and the position of the permanent magnet is easily exposed to synchrotron radiation, thus causing demagnetization.

[0035] The Super Tau-Charm Facility (STCF), as a next-generation electron-positron collider, with its ultra-high brightness target and emittance levels approaching those of third-generation light sources, places even more stringent demands on synchrotron radiation damping. Limited by the ring's circumference, the curved iron in the arc region can only provide a small portion of the synchrotron radiation yield. Therefore, a damping torsion magnet capable of achieving a high peak magnetic field strength within a compact space is needed to meet the corresponding damping time requirements.

[0036] Figure 1 The magnetic field strength diagram of the damped torsion magnet in the super taucour device is shown. Figure 2 A schematic diagram of a damped torsion magnet with its poles beveled is shown. Figure 3 The diagram shows the magnetic field strength of the damped torsional pendulum magnet in the super-Taochan device with its pole ends beveled. It should be noted that... Figure 1 This is a magnetic field strength diagram without any trimming of the pole head, and Figure 1 and Figure 3 The horizontal distance of the middle x-axis is the distance along the direction of the pole arrangement.

[0037] like Figure 1As shown, when the damping torsion magnet in the super taurine device adopts the same structural design as that in the DAFNE, its peak magnetic field strength can only reach 1.5T because the magnetic gap of the damping torsion magnet in the STCF is slightly larger than that in the DAFNE. Figure 2 As shown, to enhance the converging effect of the pole head on the magnetic flux generated by the excitation coil, the end of the pole head near the magnetic gap can be beveled. Here, S1 can represent... Figure 2 The dimension of the example pole in the horizontal direction within the plane of the paper, D1, can be represented as... Figure 2 The vertical dimension of the example pole within the plane of the paper, D2, can be represented by... Figure 2 The example shows the vertical dimension of the un-sharpened tip within the paper. S1, D1, and D2 can be 400mm, 180mm, and 105mm, respectively. Figure 3 As shown, after the pole head is slanted, the peak magnetic field strength of the damped torsion magnet of the super taurine device is close to 1.7T.

[0038] In view of this, embodiments of the present invention provide a hybrid damped torsion pendulum magnet. This damped torsion pendulum magnet avoids the method of increasing the peak magnetic field strength by increasing the excitation current by forming a concave space at the end of the pole head and placing a permanent magnet within the concave space. The placement of the permanent magnet on both sides of the pole head and the arrangement of the permanent magnet's polarization direction avoids excessive processing of the overall device structure, improves the magnetic field quality, and the permanent magnet avoids the core area irradiated by the synchrotron radiation source, reducing the risk of demagnetization.

[0039] Figure 4 A side view of the hybrid damping torsion magnet according to an embodiment of the present invention is shown.

[0040] like Figure 4As shown, the hybrid damping torsion magnet of this embodiment may include multiple pole heads 1, multiple pairs of permanent magnets 2, and excitation coils 3. The permanent magnets 2 may include a first permanent magnet 21 and a second permanent magnet 22. A magnetic gap d exists between the pole heads. The magnetic gap d is the air gap between two magnetic materials in a magnetic field (such as between pole heads). The root cross-sectional area of ​​each pole head near the magnetic gap can be smaller than the root cross-sectional area of ​​the pole head away from the magnetic gap, thus forming a concave space at the end of the pole head near the magnetic gap. In this embodiment, the pole head 1 may be an iron core made of electrical soft iron, such as electromagnetic pure iron (DT4) of grade 4. The excitation coil 3 may be a coil wound from metal wire, such as copper wire. The permanent magnets 2 may include any material that can maintain magnetism without the action of an external magnetic field, such as neodymium iron boron. The permanent magnet 2 refers to a material that can maintain magnetism after the external magnetic field is removed, possessing high remanence and coercivity. The permanent magnet 2 can generate a stable intrinsic magnetic field. When permanent magnet 2 is added to the damping torsion magnet, the inherent magnetic field of permanent magnet 2 can interact with the magnetic field of the magnet, thereby increasing the overall magnetic field strength of the device.

[0041] Figure 5 A front view structural schematic diagram of a hybrid damping torsion magnet according to an embodiment of the present invention is shown. Figure 6 A front view schematic diagram of a hybrid damping torsion magnet (excitation coil not shown) according to an embodiment of the present invention is shown.

[0042] like Figure 5 and Figure 6 As shown, multiple pole heads 1 can be arranged in a periodic pattern along a first direction and distributed in two parallel rows. Excitation coils 3 can be wound around each pole head 1 and enclose each pair of permanent magnets 2. The first direction can be represented as... Figure 5 or Figure 6 The horizontal direction within. Each row of pole tips has a magnetic gap d with another row of pole tips in a second direction intersecting the first direction (e.g., ...). Figure 5 (As shown). The second direction can be represented as Figure 5 or Figure 6 The polarization directions of the permanent magnet 2 and the pole head 1 controlled by the excitation coil 3 are arranged according to a periodic pattern. Each pole head has the opposite polarity to another pole head with a magnetic gap d in the second direction, and the polarization direction of each row of pole heads alternates along the first direction. Figure 6(Excitation coil not shown) As shown, each pair of permanent magnets 2 can be symmetrically arranged in the recessed space at the end of each pole near the magnetic gap d. Each pair of permanent magnets 2 may include a first permanent magnet 21 and a second permanent magnet 22, and the first permanent magnet 21 and the second permanent magnet 22 may have opposite polarization directions. The first permanent magnet 21 on the first pole of the plurality of poles 1 and the second permanent magnet 22 on the adjacent second pole, as well as the second permanent magnet 22 on the opposite third pole in the second direction, may all have opposite polarization directions.

[0043] According to an embodiment of the present invention, a hybrid damped torsion magnet is provided. This damped torsion magnet avoids the method of increasing the excitation current to enhance the peak magnetic field strength by forming a recessed space at the end of the pole head and arranging a permanent magnet within the recessed space. The permanent magnet is positioned inside the excitation coil, and each pair of permanent magnets is located in the recessed space at the end of each pole head near the magnetic gap. Each pair of permanent magnets includes a first permanent magnet and a second permanent magnet, which have opposite polarization directions. Furthermore, the first and second permanent magnets, as well as their adjacent permanent magnets, have opposite polarization directions in both the first and second directions. This structure enhances the peak magnetic field strength while avoiding excessive processing of the overall device structure, improving magnetic field quality. Additionally, the permanent magnets avoid the core area irradiated by synchrotron radiation sources, reducing the risk of demagnetization.

[0044] like Figure 6 As shown, the first permanent magnet 21 and the second permanent magnet 22 can be located on opposite sides of each pole head 1 along a third direction, which can be perpendicular to the plane containing the first and second directions. The third direction can represent... Figure 6 The direction is perpendicular to the plane of the paper. Permanent magnets are placed on both sides of the pole head laterally. The inherent magnetic field of the permanent magnets themselves can affect the lateral distribution of the magnetic field generated by the pole head, thereby increasing the magnetic field strength of the damped torsion magnet, and its peak magnetic field strength also increases accordingly. In addition, the lateral distribution of the permanent magnets reduces synchrotron radiation, lowering the risk of demagnetization.

[0045] Continue to refer to Figure 4The end of each pole head 1 near the magnetic gap can have a desired structure, which may include a structure with a recessed space that can accommodate each pair of permanent magnets 2, such as a trapezoidal structure or a conical structure. In a trapezoidal structure, the pole head 1 can form a recessed space at the end near the magnetic gap, and the permanent magnets 2 can be disposed within this recessed space. The dimensions of the short side of the trapezoidal structure can be specifically set according to actual design requirements. When the short side is short enough, the structure at the end of each pole head 1 near the magnetic gap can be conical. The desired structure in this embodiment can be any structure with a recessed space to accommodate each pair of permanent magnets 2; this invention does not specifically limit this. The permanent magnets 2 disposed in the recessed space do not occupy the space for the excitation coil, avoiding excessive processing of the longitudinal structure of the device. The excitation coil 3 winds the permanent magnets 2 inside, reducing the irradiation by the synchrotron radiation source and lowering the risk of demagnetization.

[0046] Figure 7 This diagram shows a side view of a hybrid damping torsion magnet with a triangular permanent magnet, as illustrated in an embodiment of the present invention. Figure 4 and Figure 7 As shown, the permanent magnet 2 can include any of the following: a stepped structure, a triangular structure, etc. For example, a stepped permanent magnet 2 can increase the effective contact area between the permanent magnet 2 and the pole head 1. By adjusting the height of the steps, the distribution and intensity of the magnetic field generated by the permanent magnet 2 and the pole head 1 can be controlled, thereby optimizing the uniformity of the magnetic field distribution and improving the magnetic field strength. In addition, the stepped permanent magnet 2 is easy to calibrate in specific positions during actual processing and is easy to operate.

[0047] In some specific embodiments, the peak magnetic field strength of the damped torsion magnet can be positively correlated with the volume of the first and second permanent magnets. The volume of the permanent magnets can increase as the dimensions of the permanent magnets in various directions increase. Increasing the volume of the permanent magnets can further improve the peak magnetic field strength of the damped torsion magnets, thereby enhancing the performance of the device.

[0048] In some specific embodiments, the polarization direction of the permanent magnet can extend along a second direction or a third direction, that is, it can extend along... Figure 5 and Figure 6 The vertical direction or the direction perpendicular to the paper (or Figure 4 and Figure 7 The permanent magnet extends in both the vertical and horizontal directions. The polarization direction of the permanent magnet is one of the key parameters affecting the magnetic field distribution. In this embodiment, the polarization direction of the permanent magnet can be adjusted according to the design of the device performance, and is not specifically limited in this invention.

[0049] Figure 8A comparison diagram of the magnetic field strength of a permanent magnet with polarization direction along the second direction and a damped torsion magnet without a permanent magnet is shown in the embodiment of the present invention. Figure 9 The diagram shows a comparison of the magnetic field strength of a permanent magnet with polarization along a third direction and a damped torsion magnet without a permanent magnet, according to an embodiment of the present invention. It should be noted that... Figure 8 and Figure 9 The horizontal distance of the middle horizontal axis is the distance in the direction of pole arrangement, that is, the distance along the first direction.

[0050] like Figure 8 and Figure 9 As shown, the peak magnetic field strength of the hybrid damped torsion magnet in this embodiment of the invention is higher than that of the damped torsion magnet without a permanent magnet. When the polarization direction of the permanent magnet is along a third direction, it is more conducive to increasing the peak magnetic field strength. When the polarization direction of the permanent magnet is along a second direction, it is equivalent to adding a small excitation coil, which is equivalent to increasing the excitation ampere-turns. When the polarization direction of the permanent magnet is along a third direction, it further regulates the original excitation current flux, concentrating it inwards and reducing the original magnetic leakage phenomenon in the concave space.

[0051] According to an embodiment of the present invention, the peak magnetic field strength of the hybrid damping torsion magnet may include 1.9T to 2.1T, for example, 1.9T, 2.0T, 2.1T, etc.

[0052] According to embodiments of the present invention, the magnetic gap d between multiple pole heads can be 30mm to 50mm, for example, 30mm, 35mm, 40mm, 45mm, 50mm, etc. The size of the magnetic gap can affect the performance and reliability of the device. An excessively large magnetic gap will lead to an increase in the device's magnetic reluctance, a decrease in magnetic flux, and a reduction in magnetic field strength. An excessively small magnetic gap will increase the difficulty of fabrication and increase the risk of contact during device operation.

[0053] According to an embodiment of the present invention, the length of the arrangement period H of the plurality of pole heads in the first direction can be the distance between the sidewalls of the two pole heads closest to each other in the same direction when the polarization directions of the first permanent magnets on the plurality of pole heads are the same (e.g., ...). Figure 3 As shown in the figure, the length of the arrangement cycle can be greater than or equal to 400mm, for example, it can be 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, 750mm, 800mm, etc.

[0054] According to an embodiment of the present invention, the total length of the hybrid damping torsion magnet can be an integer multiple of the arrangement period length. For example, when the length of the arrangement period is 400 mm, the total length of the damping torsion magnet can be 400 mm, 800 mm, 1200 mm, etc.

[0055] Figure 10 A comparison diagram of the magnetic field strength of a hybrid damped torsion pendulum magnet and a damped torsion pendulum magnet without a permanent magnet, according to an embodiment of the present invention, is shown. It should be noted that... Figure 10 The horizontal distance on the middle x-axis is the distance along the third x-axis.

[0056] like Figure 10 As shown, in this embodiment, the magnetic gap d of the hybrid damping torsion magnet is designed to be 40mm, the length of the pole arrangement period is designed to be 600mm, and the total length of the hybrid damping torsion magnet is designed to be 3.6m. The design parameters of the damping torsion magnet without permanent magnets are the same as those in this embodiment. Figure 10 It can be observed that, compared with the damped torsion magnetic field without the addition of permanent magnets, the peak magnetic field strength of the damped torsion magnet in this embodiment is higher, and the peak magnetic field strength of the damped torsion magnet in this embodiment can be increased by nearly 0.2T.

[0057] Figure 11 A comparison diagram of the magnetic field strength of the permanent magnet of the hybrid damped torsion pendulum magnet according to an embodiment of the present invention at different volumes is shown. It should be noted that... Figure 11 The horizontal distance on the middle x-axis is the distance along the third x-axis.

[0058] like Figure 11 As shown, the dimensions of the permanent magnets are designed to increase by 10% in each direction, satisfying the volume increase of permanent magnets P5, P4, P3, P2, and P1. When permanent magnets of different volumes are added to the damping torsion magnet, the peak magnetic field strength of the damping torsion magnet increases with the increase of the permanent magnet volume. In this embodiment, the peak magnetic field strength of the damping torsion magnet can be increased to 2.1T. This characteristic can be applied to various storage rings that require reduced damping time or the generation of high-flux synchrotron radiation.

[0059] The embodiments of the present invention, by adding permanent magnets to a damped torsion magnet, change the method of increasing peak magnetic field strength by significantly increasing the excitation current, and achieve a higher peak magnetic field strength. The permanent magnets are positioned on both sides of the pole head laterally, improving the quality of the magnetic field without requiring excessive processing of the device's longitudinal structure, and avoiding the core area of ​​synchrotron radiation, further reducing the risk of demagnetization.

[0060] Those skilled in the art will understand that the features described in the various embodiments of the present invention can be combined and / or combined in various ways, even if such combinations or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments of the present invention can be combined and / or combined in various ways without departing from the spirit and teachings of the present invention. All such combinations and / or combinations fall within the scope of the present invention.

[0061] The embodiments of the present invention have been described above. However, these embodiments are merely illustrative and not intended to limit the scope of the invention. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of the invention, and all such substitutions and modifications should fall within the scope of the invention.

Claims

1. A hybrid-damped torsional magnet, characterized by, The hybrid damping torsional magnet comprises: a plurality of pole heads arranged in a periodic pattern along a first direction and in two rows of mutually parallel poles, wherein each row of poles has a magnetic gap with another row of poles in a second direction intersecting the first direction, each pole head has a root cross-sectional area at an end close to the magnetic gap smaller than a root cross-sectional area at an end away from the magnetic gap, each pole head has an opposite polarity with another pole head having a magnetic gap in the second direction, and a polarization direction of each row of poles alternates along the first direction; a plurality of pairs of permanent magnets, each pair of permanent magnets symmetrically arranged in a recessed space at an end of each pole head close to the magnetic gap, wherein each pair of permanent magnets comprises a first permanent magnet and a second permanent magnet, the first permanent magnet and the second permanent magnet have opposite polarization directions, the first permanent magnet on a first pole head in the first direction and the second permanent magnet on a second pole head adjacent to the first pole head and the second permanent magnet on a third pole head opposite to the first pole head in the second direction all have opposite polarization directions; and an excitation coil wound around each pole head and wrapping around each pair of permanent magnets.

2. The hybrid-damped torsional magnet of claim 1, wherein The first permanent magnet and the second permanent magnet are respectively located on opposite sides of each pole head in a third direction perpendicular to a plane in which the first direction and the second direction lie.

3. The hybrid-damped torsional magnet of claim 2, wherein The polarization directions of the first permanent magnet and the second permanent magnet extend along the second direction or the third direction.

4. The hybrid-damped torsional magnet of claim 1, wherein The end of each pole head close to the magnetic gap has a desired structure, and the desired structure comprises a structure having the recessed space accommodating each pair of permanent magnets.

5. The hybrid-damped torsional magnet of claim 1, wherein The first permanent magnet and the second permanent magnet comprise any one of the following structures: a stepped structure, a triangular structure.

6. The hybrid-damped torsional magnet according to any one of claims 1 to 5, wherein The peak magnetic field strength of the hybrid damping torsional magnet is positively correlated with the volume of the first permanent magnet and the second permanent magnet.

7. The hybrid-damped torsional magnet according to any one of claims 1 to 5, wherein The peak magnetic field strength of the hybrid damping torsional magnet comprises 1.9T-2.1T.

8. The hybrid-damped torsional magnet according to any one of claims 1 to 5, wherein The magnetic gap between the plurality of pole heads comprises 30mm-50mm.

9. The hybrid-damped torsional magnet according to any one of claims 1 to 5, wherein The arrangement period length of the plurality of pole heads in the first direction is the distance between the side walls of the closest two pole heads in the same direction when the polarization directions of the first permanent magnets on the plurality of pole heads are the same, and the arrangement period length is greater than or equal to 400mm.

10. The hybrid-damped torsional magnet of claim 9, wherein The total length of the hybrid damping torsional magnet is an integer multiple of the arrangement period length.

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