Magnet with adjustable magnetic field center line, method and application

Abstract

The invention belongs to the technical field of magnet magnetic fields, and particularly relates to a magnet with an adjustable magnetic field center line, a method and application. Comprising a pneumatic push rod and a magnet body; the pneumatic push rod is connected with a structural member of the magnet body, and the pneumatic push rod is a three-position push rod; by adjusting the stroke of the pneumatic push rod, the six-degree-of-freedom position adjustment of the center line of the three-coordinate magnetic field is realized. The pneumatic push rod is matched with the ball head mechanism, three-coordinate six-degree-of-freedom adjustability of the magnetic field center line is achieved, the adopted pneumatic push rod is not affected by the magnetic field of the magnet or a background magnetic field, adjustability of the magnetic field center line is achieved in the magnet use preparation stage, the excitation operation stage or the demagnetization safety stage, and meanwhile the magnetic field center line can be adjusted in the magnet use preparation stage or the excitation operation stage or the demagnetization safety stage. The method is not limited by magnet types, and can be applied to permanent magnets, normal magnetizers and superconducting magnets. At least three pneumatic push rods are needed to cooperate in a magnet center magnetic field adjusting mode.

Description

Technical Field

[0001] This invention relates to the field of magnet magnetic field technology, specifically to magnets with adjustable magnetic field centerlines, methods, and applications. Background Technology

[0002] The description of the background art in this invention pertains to related technologies and is used merely for illustration and to facilitate understanding of the invention. It should not be construed as the applicant explicitly believing or presuming that the invention was prior art on the filing date of the first application.

[0003] Magnets mainly include permanent magnets, conventionally conducting magnets, and superconducting magnets. Permanent magnets are gradually being replaced due to field strength limitations, while conventionally conducting and superconducting magnets are widely used in scientific research, industry, medicine, and large scientific facilities. The core working principle of a magnet is to utilize the magnetism of natural magnets or a current-carrying conductor to generate a specific target magnetic field. Parameters such as magnetic field strength, field shape, field uniformity, magnetic field centerline, and magnetic induction lines are the main design indicators. These parameters are optimized according to the specific application requirements to achieve the desired application scenarios.

[0004] The magnetic field centerline is the theoretical centerline that is not visible along the axis of the magnet. It is one of the key design parameters of the magnet. For a single magnet, it affects the accurate positioning of the target and the distribution of magnetic field lines. For a magnet with a background field, it affects the field uniformity of the matching magnet, the accuracy of the center field of the magnetic field centerline, and the magnetic field distribution.

[0005] Due to differences in winding, skipped turns, and errors in processing and installation, the magnetic field centerline of the magnet deviates to a certain extent from the theoretically designed magnetic field centerline. Summary of the Invention

[0006] The purpose of this invention is to provide a magnet with an adjustable magnetic field centerline, a method thereof, and its application. The magnet with an adjustable magnetic field centerline of this invention can improve the uniformity of the magnetic field gap, optimize the magnetic field distribution, and is adjustable online, enabling precise positioning of the magnetic field centerline.

[0007] A magnet with an adjustable magnetic field centerline includes: a pneumatic actuator and a magnet body; the pneumatic actuator is connected to a structural component of the magnet body, and the pneumatic actuator is a three-position actuator; by adjusting the stroke of the pneumatic actuator, the position adjustment of the magnetic field centerline in a three-axis coordinate system with six degrees of freedom can be achieved.

[0008] Furthermore, the magnet body includes a magnet and a circular frame, and the pneumatic push rod is connected to the circular frame.

[0009] Furthermore, the number of pneumatic push rods is at least 3.

[0010] Furthermore, the magnet body includes a superconducting magnet and a magnet Dewar, the pneumatic push rod is connected to the magnet Dewar, the magnet Dewar is disposed outside the superconducting magnet, and the magnet Dewar is connected to the superconducting magnet through a hanging rod.

[0011] Furthermore, the number of gas push rods is at least four.

[0012] Furthermore, the magnetic Dewar is square; the gas Dewar has a low-temperature vacuum environment inside; and the pneumatic push rod is placed outside the Dewar.

[0013] Furthermore, the pneumatic push rod includes a ball joint mechanism, a push rod body, and an air pump. The ball joint mechanism is located at the free end of the push rod body and is used to connect with the target magnet structure. The push rod body is provided with an air hole. The air hole is connected to the air pump through an air pipe. An air valve is provided on the air pipe.

[0014] A method for using a magnet with an adjustable magnetic field centerline includes the following steps: installing the magnet and a pneumatic push rod, establishing a coordinate system and determining the reference coordinates; measuring the magnetic field on the magnetic field centerline, comparing it with the theoretical magnetic field centerline, fine-tuning, and adjusting until the error is less than 0.1%, at which point the adjustment of the magnetic field centerline can be considered complete.

[0015] An application of a magnet with an adjustable magnetic field centerline, wherein the aforementioned magnet with an adjustable magnetic field centerline is applied to the adjustment of the magnetic field centerline during the magnet preparation stage, the excitation operation stage, or the demagnetization safety stage.

[0016] The embodiments of the present invention have the following beneficial effects:

[0017] The purpose of this invention is to propose a fully autonomous and adjustable magnetic field centerline adjustment method with three coordinates and six degrees of freedom. This method adjusts the magnetic field centerline to address deviations in the number of turns during conductor winding, deviations caused by the influence of winding tension on the duty cycle, deviations during the overall assembly of the magnet, deviations during mechanical docking with the target object in the application scenario, and magnetic field deviations after superposition with the background field. This method can be used for both offline and online adjustment under energized conditions.

[0018] The present invention provides a three-coordinate adjustment for the magnetic field centerline of the magnet, which theoretically can adjust the magnetic field centerline to coincide with the design axis, so that the magnetic field distribution of the magnetic field centerline is highly consistent with the theoretical design value, thereby improving the accuracy of the magnetic field in the application scenario.

[0019] This invention uses a pneumatic actuator for adjustment, which is not affected by its own magnetic field or the external background field. It can be adjusted in both field and field-free environments. During the actual application of the target, it is adjustable throughout the process and is not affected by the external background field, making the adjustment process more flexible.

[0020] The pneumatic push rod of this invention adopts a ball joint mechanism connection, which takes into account both stiffness and degree of freedom during the adjustment process. Neither the magnet system nor the push rod will undergo elastoplastic deformation, making the adjustment effective, accurate, and reliable. Attached Figure Description

[0021] Figure 1 Schematic diagram of a magnet with an adjustable magnetic field centerline;

[0022] Figure 2 Schematic diagram of a superconducting magnet with an adjustable magnetic field centerline;

[0023] Figure 3 A schematic diagram of the pneumatic push rod of the end ball joint mechanism. Detailed Implementation

[0024] The present application will be further described below with reference to the embodiments.

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, in the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Different embodiments can be substituted or combined, and for those skilled in the art, other implementation methods can be obtained based on these embodiments without creative effort.

[0026] The following is in conjunction with the appendix Figure 1 ~Attached Figure 3 Further explanation is given regarding a magnet with an adjustable magnetic field centerline.

[0027] A magnet with an adjustable magnetic field centerline includes: a pneumatic actuator and a magnet body; the pneumatic actuator is connected to a structural component of the magnet body, and the pneumatic actuator is a three-position actuator; by adjusting the stroke of the pneumatic actuator, the position adjustment of the magnetic field centerline in a three-axis coordinate system with six degrees of freedom can be achieved.

[0028] Furthermore, the magnet body includes a magnet and a circular frame, and the pneumatic push rod is connected to the circular frame.

[0029] Furthermore, the number of pneumatic push rods is at least 3.

[0030] Furthermore, the magnet body includes a superconducting magnet and a magnet Dewar, the pneumatic push rod is connected to the magnet Dewar, the magnet Dewar is disposed outside the superconducting magnet, and the magnet Dewar is connected to the superconducting magnet through a hanging rod.

[0031] Furthermore, the number of gas push rods is at least four.

[0032] Furthermore, the magnetic Dewar is square; the gas Dewar has a low-temperature vacuum environment inside; and the pneumatic push rod is placed outside the Dewar.

[0033] Furthermore, the pneumatic push rod includes a ball joint mechanism, a push rod body, and an air pump. The ball joint mechanism is located at the free end of the push rod body and is used to connect with the target magnet structure. The push rod body is provided with an air hole. The air hole is connected to the air pump through an air pipe. An air valve is provided on the air pipe.

[0034] A method for using a magnet with an adjustable magnetic field centerline includes the following steps: installing the magnet and a pneumatic push rod, establishing a coordinate system and determining the reference coordinates; measuring the magnetic field on the magnetic field centerline, comparing it with the theoretical magnetic field centerline, fine-tuning, and adjusting until the error is less than 0.1%, at which point the adjustment of the magnetic field centerline can be considered complete.

[0035] An application of a magnet with an adjustable magnetic field centerline, wherein the aforementioned magnet with an adjustable magnetic field centerline is applied to the adjustment of the magnetic field centerline during the magnet preparation stage, the excitation operation stage, or the demagnetization safety stage.

[0036] refer to Figure 1 The coil 1 is wound on the frame 2 (which needs to be insulated from the coil), corresponding to the magnetic field centerline 3. Three pneumatic push rods 4 are connected to the frame 2. All three pneumatic push rods are three-dimensional push rods. By adjusting the stroke of the pneumatic push rods, the position of the magnetic field centerline in three coordinates can be adjusted in six degrees of freedom. In this reference figure, the pneumatic push rods 4 are installed on the coil frame 2. In actual situations, the pneumatic push rods can be arranged on suitable structural components according to the magnet structure layout. The number of pneumatic push rods should be at least 3. This reference figure is applicable to conventionally conductive magnets.

[0037] refer to Figure 2 The superconducting coil 21 is fixed in the magnet Dewar 22 by the suspension rod 23, forming a superconducting magnet vacuum interlayer, corresponding to the magnetic field centerline 24. Four pneumatic push rods 25 are connected to the magnet Dewar 3. By adjusting the stroke of the pneumatic push rods, the position of the magnetic field centerline in three coordinates can be adjusted. For superconducting magnets, the inside of the Dewar 22 is a low-temperature vacuum environment. Therefore, it is easy to place the pneumatic push rods outside the Dewar. This reference figure is applicable to superconducting magnets.

[0038] refer to Figure 3 For reference Figure 1 Reference Figure 2 The schematic diagram of the pneumatic push rod shows that the ball head mechanism 31 can achieve multiple degrees of freedom and is connected to the target magnet structure. The pneumatic push rod 32 can achieve high-precision adjustment of gas flow by adjusting the air valve 35. The air hole 33 is used to connect to the air pump 36 through the air pipe 34. The entire push rod mechanism is driven by gas and is not affected by the magnetic field of the magnet. The center line of the magnetic field can be adjusted without being affected by the online excitation and offline test preparation.

[0039] step:

[0040] 1) Installation of the magnet and pneumatic actuator, in order to Figure 1 For example, the three push rods form an equilateral triangle with a side length of L;

[0041] 2) Using the coordinates of the topmost pneumatic actuator as a reference, define the X1, Y1, and Z1 coordinates as (0, 0, 0). Adjust the other two pneumatic actuators until the X2, Y2, and Z2 coordinates of the lower left pneumatic actuator are (-Lsin(π / 6), -Lcos(π / 6), 0), and the X3, Y3, and Z3 coordinates of the lower right pneumatic actuator are (Lsin(π / 6), -Lcos(π / 6), 0). At this point, the theoretical adjustment is complete.

[0042] 3) Measure the magnetic field on the center line of the magnetic field, compare it with the theoretical center line magnetic field, make fine adjustments, and adjust it until the error is less than 0.1%. The adjustment of the center line of the magnetic field can be considered complete.

[0043] Figure 2 and Figure 1 The only difference is the number of pushers, but the principle is the same, so I won't go into details here. The coordinates of the four points at the top left, top right, bottom right, and bottom left are (0, 0, 0), (L, 0, 0), (L, -L, 0), and (0, -L, 0), respectively.

[0044] When operating offline, unless otherwise specified, the steps are the same as described above, that is, use one push rod as a reference and adjust the other push rods.

[0045] When operating online, the aforementioned steps are the same. It is important to note that after adjustment, the actual usage scenario needs to be considered. For example, if the dynamic magnet needs to move in a straight line, the push rod needs to be removed before testing.

[0046] It should be noted that the above embodiments can be freely combined as needed. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A magnet with an adjustable magnetic field centerline, characterized in that, include: The adjustable magnetic field centerline magnet includes a pneumatic push rod and a magnet body; the pneumatic push rod is connected to the structural components of the magnet body, and the pneumatic push rod is a three-position push rod; by adjusting the stroke of the pneumatic push rod, the position adjustment of the magnetic field centerline in three coordinates with six degrees of freedom can be achieved.

2. The magnet with an adjustable magnetic field centerline according to claim 1, characterized in that, The magnet body includes a magnet and a circular frame. The magnet includes a coil and a frame. The coil is wound around the frame one turn at a time to form the magnet. The inner ring is the frame, and the outer ring is the coil after winding. The pneumatic push rod is connected to the circular frame.

3. The magnet with an adjustable magnetic field centerline according to claim 2, characterized in that, The number of pneumatic push rods is at least 3.

4. The magnet with an adjustable magnetic field centerline according to claim 1, characterized in that, The magnet body includes a superconducting magnet and a magnet Dewar. The pneumatic push rod is connected to the magnet Dewar. The magnet Dewar is disposed outside the superconducting magnet and is connected to the superconducting magnet via a hanging rod.

5. The magnet with an adjustable magnetic field centerline according to claim 4, characterized in that, The number of gas push rods is at least 4.

6. The magnet with an adjustable magnetic field centerline according to claim 4, characterized in that, The magnetic Dewar is square; the gas Dewar has a low-temperature vacuum environment inside; and the pneumatic push rod is placed outside the Dewar.

7. The magnet with an adjustable magnetic field centerline according to claim 4, characterized in that, The pneumatic push rod includes a ball joint mechanism, a push rod body, and an air pump. The ball joint mechanism is located at the free end of the push rod body and is used to connect with the target magnet structure. The push rod body is provided with an air hole. The air hole is connected to the air pump through an air pipe. An air valve is provided on the air pipe.

8. A method of using a magnet with an adjustable magnetic field centerline, characterized in that, The process includes the following steps: installing the magnet and the pneumatic push rod, establishing a coordinate system and determining the reference coordinates; measuring the magnetic field on the center line of the magnetic field, comparing it with the theoretical center line magnetic field, fine-tuning it until the error is less than 0.1%, at which point the adjustment of the magnetic field center line can be considered complete.

9. An application of a magnet with an adjustable magnetic field centerline, characterized in that, The magnetic field centerline adjustable magnet according to any one of claims 1-7 is applied to the adjustment of the magnetic field centerline during the magnet preparation stage, excitation operation stage, or demagnetization safety stage.

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