Three-axis constant magnetic field generating device for high-speed magnetic levitation operation and control equipment

Abstract

The invention discloses a three-axis constant magnetic field generating device for high-speed magnetic levitation operation and control equipment. The three-axis constant magnetic field generating device comprises a magnetic induction part and a mobile platform, the magnetic induction part comprises three magnetic induction coil groups which are sleeved with one another and generate magnetic fields in the X direction, the Y direction and the Z direction; the three magnetic induction coil groups comprise a coil group A, a coil group B and a coil group C, each coil group is composed of two identical circular conductor coils, the two conductor coils are oppositely arranged, and a complete Z-axis magnetic field, a complete Y-axis magnetic field and a complete X-axis magnetic field are formed between the two conductor coils of the coil group A, the two conductor coils of the coil group B and the two conductor coils of the coil group C respectively. Constant magnetic fields are formed in the X-axis direction, the Y-axis direction and the Z-axis direction The moving platform is connected with one side of the magnetic induction part, the other end of the moving platform is connected with the starting end, a test object is placed at the starting end, and the test object is conveyed into the magnetic induction part through the moving platform. The device has the beneficial effects that the magnetic field environment is accurately controlled, the device is compact, the orthogonality of the magnetic field is ensured, and the device performance and precision are high.

Description

Technical Field

[0001] The present disclosure belongs to the field of magnetic levitation applications, and in particular relates to a three-axis constant magnetic field generating device for high-speed magnetic levitation transportation and control equipment. Background Art

[0002] A maglev train is a means of transportation that uses the principle of magnetism to suspend the vehicle body above the track and is guided by an electromagnetic guidance system. It has a series of advantages such as zero emissions and environmental protection, ultra-low noise, and high operating speed. At present, my country has achieved many results in the application of maglev.

[0003] The electromagnetic emission sources of a high-speed maglev train include long-stator linear synchronous motors, onboard equipment, and high-voltage cables. The DC magnetic field source of the maglev system primarily consists of the levitation electromagnets and contact rails. When DC current is passed through the electromagnet's excitation winding, it generates a static magnetic field and the air gap magnetic field required for magnetic levitation. The air gap magnetic field generated by the linear motor can reach up to approximately 1T. Furthermore, leakage magnetic fields are generated on the sides, above, and below the electromagnets. The DC power supply system of the maglev system generates a constant magnetic field around them.

[0004] The current rail transit electromagnetic compatibility standards do not have specific provisions and requirements for the electromagnetic immunity of equipment under external constant magnetic fields. However, in order to meet the requirements of future development standards, and whether some operation and control equipment such as transponders can work normally in a constant magnetic field environment directly affects the driving safety of maglev trains; therefore, it is necessary to carry out electromagnetic interference test experiments based on a constant magnetic field environment to verify and improve the reliability of high-speed maglev trains.

[0005] Therefore, the "three-axis constant magnetic field generating device for high-speed maglev transportation and control equipment" proposed in the present invention can generate a three-axis constant magnetic field within a certain range, thereby supporting performance testing of high-speed maglev transportation and control equipment in a constant magnetic field environment. Summary of the Invention

[0006] In view of the above problems, the present disclosure proposes a three-axis constant magnetic field generating device for high-speed magnetic levitation transportation and control equipment, which can simply and effectively perform electromagnetic interference test experiments on some transportation and control equipment based on a constant magnetic field environment, and can accurately control the magnetic field environment. The structure of this device is very stable, the device is compact and ensures the orthogonality of the three-dimensional magnetic field. The overall device performance and accuracy are relatively high.

[0007] The purpose of this disclosure is achieved through the following technical solutions: The disclosed embodiment provides a three-axis constant magnetic field generating device for high-speed magnetic levitation transportation and control equipment, comprising: a magnetic induction unit and a moving platform; The magnetic induction unit includes three magnetic induction coil groups that are nested within each other and can generate magnetic fields in the X, Y, and Z directions. These three magnetic induction coil groups are coil group A, coil group B, and coil group C. Each coil group is composed of two identical circular conductor coils, which are arranged opposite each other and separated by a certain distance. A complete Z-axis magnetic field is formed between the two conductor coils in coil group A, a complete X-axis magnetic field is formed between the two conductor coils in coil group B, and a complete Y-axis magnetic field is formed between the two conductor coils in coil group C. Therefore, when controlling the output current of the power supply, a constant magnetic field space is formed in the X, Y, and Z directions in the magnetic induction unit.

[0008] The mobile platform is connected to one side of the magnetic induction part and the other end is connected to the starting end. The test object is placed at the starting end and is transported to the magnetic induction part through the mobile platform.

[0009] Preferably, the magnetic induction portion further includes a plurality of connectors; the coil group A, the coil group B and the coil group C are each sleeved with a plurality of connectors at equal intervals, thereby fixing the three magnetic induction coil groups.

[0010] Preferably, the lower end surfaces of the plurality of connectors are fixedly connected to the rectangular base, so that the three magnetic induction coil groups are vertically arranged on the base.

[0011] Furthermore, the connecting member is a long rectangular frame, in which a plurality of connecting bars are provided. The connecting bars divide the long rectangle into a plurality of panes, and the conductor coils of the three coil groups are inserted into the panes.

[0012] Furthermore, a cylinder is provided inside the three mutually nested magnetic induction coil groups, and the test object is transported into the cylinder via a moving platform.

[0013] Furthermore, the cylinder is an aluminum cylinder wound with rectangular copper wire.

[0014] Most preferably, the annular end surface of coil assembly A is arranged parallel to the upper surface of the base, coil assembly B is arranged in coil assembly A and perpendicular to coil assembly A, and coil assembly C is arranged in coil assembly B and perpendicular to coil assembly B.

[0015] In addition, the mobile platform includes a guide rail, which is a screw mechanism driven by a motor. The screw is equipped with a loading plate. When the screw rotates, the loading plate moves along the direction of the screw between the magnetic induction part and the starting end, transporting the test object from the starting end into or out of the magnetic induction part.

[0016] Furthermore, one end of the guide rail is connected to the test object entrance of the magnetic induction part, and the other end of the guide rail is provided with a loading plate, and a mounting seat is provided on the lower surface of the loading plate. The mounting seat and the lead screw of the guide rail are inserted through the threaded hole.

[0017] In addition, the three-axis constant magnetic field generating device of the present application also includes a temperature transmitter, a DC power supply, a frequency converter, a terminal host, an I / O controller, and an air-cooled radiator.

[0018] The DC power supply is connected to the magnetic induction coil group and controls the generation and dimensional transformation of the constant magnetic field together with the I / O controller. At the same time, a temperature transmitter and an air-cooled radiator are provided in the magnetic induction part to dissipate heat and monitor the coil temperature and transmit the temperature information to the terminal host. The mobile platform is controlled by a frequency converter.

[0019] The present invention has the following advantages: (1) Currently, there are no requirements for the electromagnetic immunity of equipment under an external constant magnetic field. However, for future development needs, whether some equipment such as transponders can operate normally in a constant magnetic field environment affects the driving safety and use of the maglev train. Therefore, this scheme designs a three-axis constant magnetic field generator that can perform electromagnetic interference test experiments based on a constant magnetic field environment. The experimental device designed in this scheme uses an aluminum cylinder in a constant magnetic field environment. The design of the aluminum cylinder can effectively reduce magnetic field leakage, improve the uniformity of the magnetic field, and protect the test object from the influence of the external environment. In combination with multiple sets of orthogonal Helmholtz coils, it can ensure the precise control and stable output of the magnetic field. (2) This scheme also designs multiple connectors to stably connect and fix the three magnetic induction coil groups that generate a constant magnetic field. This structure is conducive to improving the installation accuracy and stability of the conductor coil, thereby improving the uniformity and stability of the magnetic field. It not only facilitates the installation and maintenance of the coil, but also improves the compactness and aesthetics of the device. The layout of the coil group in this scheme ensures the orthogonality of the magnetic fields in three directions, improves the performance and accuracy of the overall device, and configures a mobile platform to move the test object to the constant magnetic field environment, thereby improving the transportation efficiency and accuracy of the test object and making transportation more convenient and efficient, and improving the automation level of the device. Temperature transmitters and air-cooled radiators are also set up to achieve precise control of the magnetic field strength and temperature, thereby improving the reliability and accuracy of the test.

[0020] Other features and advantages of the present disclosure will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present disclosure. The purpose and other advantages of the present disclosure can be achieved and obtained through the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 This is a schematic diagram of the first perspective structure of the present disclosure; Figure 2 This is a schematic diagram of the structure of the present disclosure from a top view perspective; Figure 3 This is a schematic diagram of the structure of the present disclosure from a half-face cross-sectional perspective; Figure 4 This is a connection diagram of the three-dimensional constant magnetic field device; Figure 5 The trajectory diagram of the magnetic field lines of the Helmholtz coil bisecting the surface; In the figure: 1-coil assembly A, 2-coil assembly B, 3-coil assembly C, 4-connector, 5-base, 6-cylinder, 7-guide rail, 8-starting end, 9-loading plate. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present disclosure without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0024] It should be noted that the terms "first", "second" etc. in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the application described herein. In this application, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "center", "vertical", "horizontal", "lateral", "longitudinal" etc. are based on the directions or positional relationships shown in the accompanying drawings.

[0025] It's important to note that magnetization occurs when a component's magnetic moments align in a single direction and exhibit a certain degree of magnetism under the influence of a magnetic field. There are several common methods for magnetizing an object: rubbing the south or north pole of a magnet against the object in one direction; winding an insulated wire around the object, passing a direct current through it, and then removing it after a period of time; and attracting the object to a magnet, which, over time, will impart magnetism. Magnetic fields can alter the magnetization state of a material, thus affecting the performance of electronic devices. Long-term exposure to the strong magnetic field of vacuum maglev can cause some components to become magnetized. When materials in electronic devices are exposed to a magnetic field, their spin and orbital motion become coupled, ultimately causing a shift in the component's resistance and inductance.

[0026] It should be noted that the constant magnetic field experimental device of this scheme uses a Helmholtz coil as a core component. The Helmholtz coil is a device that creates a uniform magnetic field in a small area. It is open and can be used to place or remove other instrument components. It can also be directly observed visually. It is a device commonly used in physical experiments. The Helmholtz coil can also be used to offset the earth's magnetic field and create an area with a near-zero magnetic field.

[0027] Furthermore, if Figure 5 As shown, the Helmholtz coils are composed of a pair of identical circular conductor coils. Based on the XYZ rectangular coordinate system, the two conductor coils are coaxially arranged, and the z-coordinates of the two coils are h / 2 and -h / 2 respectively. Each conductor coil carries a current I in the same direction, and the magnetic field between the two coils is approximately uniform.

[0028] And at the center point of the Helmholtz coil, the magnetic field value is:

[0029] Where B is the magnetic field value; I is the current in the same direction; R is the resistance value; is the magnetic field coefficient.

[0030] It should be noted that the magnetic field value generated by the Helmholtz coil is usually small, but under the conditions of appropriate size design and sufficiently large current input into the coil, it can generate a magnetic field value sufficient to affect the electrical characteristics of some operation and control equipment.

[0031] Now combine with Figure 1-Figure 5 The present invention is described in further detail.

[0032] These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0033] like Figure 1-Figure 3As shown, the present invention is a three-axis constant magnetic field generating device for high-speed maglev transportation and control equipment, comprising: a magnetic induction unit and a mobile platform; the magnetic induction unit includes three magnetic induction coil groups wound with current, each nested and capable of generating magnetic fields in the X, Y, and Z directions; the three magnetic induction coil groups include coil group A1, coil group B2, and coil group C3, each consisting of two identical circular conductor coils, the two conductor coils being arranged opposite each other and spaced a certain distance apart. A complete Z-axis magnetic field is formed between the two conductor coils in coil group A1, a complete X-axis magnetic field is formed between the two conductor coils in coil group B2, and a complete Y-axis magnetic field is formed between the two conductor coils in coil group C3. As a result, when the power supply output current is controlled, a constant magnetic field space is formed in the magnetic induction unit in the X, Y, and Z directions; the mobile platform is connected to one end of the magnetic induction unit, and the other end of the mobile platform is connected to a starting end 8. A test object is placed at the starting end 8 and is transported to the magnetic induction unit via the mobile platform.

[0034] As an improvement, in order to fix the three magnetic induction coil groups and prevent them from rolling or shifting, four connectors 4 are evenly spaced apart on each of the coil groups A1, B2, and C3. The connector 4 is a long rectangular frame with a plurality of connecting strips therein. The connecting strips divide the long rectangle into a plurality of window panes. The conductor coils of the three coil groups are inserted into the window panes to ensure that the relative positions of the three remain unchanged. Moreover, the lower end surface of the connector 4 is connected to the base 5, thereby fixing the three magnetic induction coil groups on the base 5.

[0035] Specifically, if Figure 1 As shown, the X-axis magnetic field is generated by a pair of conductor coils in the coil group B2 (i.e., the middle coil group), the Y-axis magnetic field is generated by a pair of conductor coils in the coil group C3 (i.e., the innermost coil group), and the Z-axis magnetic field is generated by a pair of conductor coils in the coil group A1 (i.e., the outermost coil group).

[0036] With this design, the magnetic fields generated will not interfere with each other.

[0037] It should be noted that the above design can, on the one hand, ensure the realization of the minimum group spacing requirement of the current design; on the other hand, it can effectively ensure the firmness of the coil assembly.

[0038] In addition, the coil group A1, coil group B2, and coil group C3 can be divided into a ratio of 3:2:1 according to the proportional size relationship, but are not limited to this ratio; and the magnetic field strength in the three directions is kept consistent during the experiment. The current on each wire can be changed by discrete adjustment, thereby quickly changing the magnetic field strength in the three directions of XYZ to perform two-dimensional tensor field measurement.

[0039] Furthermore, the connecting member 4 may be a rectangular parallelepiped structure or other structures as long as it can fix the magnetic induction coil assembly.

[0040] In order to reduce costs and ensure stable performance, the connecting piece 4 is made of a metal material that is not easy to rust.

[0041] Furthermore, an aluminum cylinder 6 wound with a flat copper wire is provided inside the three mutually nested magnetic induction coil groups. The aluminum cylinder 6 is hollow inside, and the test object is transported into the aluminum cylinder 6 via the mobile platform.

[0042] Preferably, the mobile platform includes a guide rail 7, which is a linear track. A lead screw mechanism driven by a motor drives the loading plate 9 to move at a constant speed on the track. The lead screw is equipped with the loading plate 9. When the lead screw rotates, the loading plate 9 moves back and forth between the magnetic induction part and the starting end 8 along the direction of the lead screw, thereby transporting the test object from the starting end 8 into or out of the magnetic induction part.

[0043] In order to further improve the measurement accuracy and optimize the use effect, the guide rail 7 uses a linear rail with an accuracy grade of P.

[0044] In addition, the height of the starting end 8 is equal to the height of the moving platform, ie, the loading plate 9; and a platform for placing the test object is provided on the starting end 8.

[0045] It should be noted that the base 5 and the mobile platform adopt a rectangular structure, which meets the requirements of existing processing technology and is convenient for assembly, maintenance, repair and replacement.

[0046] In order to facilitate understanding of the above technical solutions of the present invention, the working principle or operation mode of the present invention in actual process is described in detail below.

[0047] When using a three-axis constant magnetic field generator for measurement, the test object is first placed on the mobile platform from the starting end 8. The mobile platform is controlled to transport the test object into the magnetic sensing part and stop it inside the aluminum cylinder 6. Then, current is passed through coil group A1, coil group B2, and coil group C3 to form a uniform magnetic field of a certain magnitude in the X, Y, and Z directions. Finally, the test is performed and the feedback signal is collected to obtain the required data.

[0048] According to the above description, the present invention can be used to conveniently perform two-dimensional magnetic field changes in the XY plane and magnetic field changes in the XYZ three-dimensional space to simulate test requirements under various working conditions; and the cost is very low, and the number of reusable times is large, which is conducive to large-scale promotion and use.

[0049] As a preference, Figure 4As shown, it also includes: a temperature transmitter, a DC power supply, a frequency converter, a terminal host, an I / O controller, a terminal host, and an air-cooled radiator; the DC power supply is connected to the magnetic induction coil group and controls the generation of a constant magnetic field and dimensional transformation together with the I / O controller. At the same time, a temperature transmitter and an air-cooled radiator are provided in the magnetic induction part to dissipate heat and monitor the coil temperature and transmit the temperature information to the terminal host, while the mobile platform controls the speed and displacement through the frequency converter.

[0050] It should be noted that the real-time position acquisition of the test sample in the magnetic field can be achieved through the physical position sensor; the real-time monitoring of the coil group temperature can be achieved through the temperature transmitter to prevent all equipment from burning due to excessive coil temperature; and the real-time working conditions of data acquisition, power supply, drive motor and other equipment can be controlled through the I / O controller.

[0051] Furthermore, a circular iron block with a diameter of X mm was placed at the starting end 8. The iron block was made of U magnetic material taken from the steel. A mobile platform pushed it from the starting end 8 into the aluminum cylinder 6 of the magnetic induction unit. Three-phase three-wire AC power was converted by a frequency converter (non-isolated type) and input into the three magnetic induction coils. The magnetic induction unit generated a complete XYZ three-axis magnetic field. The magnetic field data was measured using a gaussmeter.

[0052] This device is controlled by cooperating with a computer. By using the MODBUS communication protocol and RS485 data bus, the computer, power supply, relay and other equipment are connected to the device. After connection, the power supply is controlled by the computer and the magnetic field strength is controlled by modifying the current parameters of the power supply. The switching of the magnetic field dimensions (XYZ) is achieved by controlling the relay.

[0053] When using the three-axis constant magnetic field generator for high-speed maglev transportation and control equipment provided by an embodiment of the present invention, the three-axis constant magnetic field generator is first adjusted, and the current magnitude and direction in the three magnetic induction coils are adjusted to form magnetic fields of the required magnitude in the X, Y, and Z directions respectively; then, the test object is placed in the movable platform at the starting end 8, and the lead screw is driven to rotate, thereby causing the movable platform to move stably; finally, the three-axis constant magnetic field generator is turned on, and the movable platform is adjusted to send the test object into the three-axis constant magnetic field generator and position it in the center of the aluminum cylinder 6. After it stops, the magnetic field distribution inside the test object sample is measured and tested.

[0054] Furthermore, since a constant external magnetic field is generated inside the test object, it is very beneficial to perform electron accelerator debugging tests on the test object under precise controlled motion.

[0055] In summary, the three-axis constant magnetic field generating device for high-speed maglev transportation and control equipment provided in the embodiment of the present invention can easily allow the test object on the mobile platform to enter and provide a stable three-dimensional constant magnetic field environment, which is conducive to the suspension system testing in high-speed maglev transportation equipment.

[0056] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A three-axis constant magnetic field generating device for high-speed magnetic levitation transportation and control equipment, characterized in that: include: Magnetic sensing unit and mobile platform; The magnetic induction unit includes three magnetic induction coil groups nested with each other and capable of generating magnetic fields in three directions of X, Y, and Z. The magnetic induction coil group includes a coil group A (1), a coil group B (2) and a coil group C (3), each of the three coil groups being composed of two identical circular conductor coils, the two conductor coils being spaced apart and arranged opposite to each other; A complete Z-axis magnetic field is formed between the two conductor coils in coil group A (1), a complete X-axis magnetic field is formed between the two conductor coils in coil group B (2), and a complete Y-axis magnetic field is formed between the two conductor coils in coil group C (3); a constant magnetic field space is formed in the X, Y, and Z directions in the magnetic induction part; The mobile platform is connected to one side of the magnetic induction part, and the other end of the mobile platform is connected to the starting end (8). The starting end (8) is used to place the test object, and the test object is transported to the magnetic induction part via the mobile platform.

2. The three-axis constant magnetic field generating device according to claim 1, characterized in that: include: The magnetic induction part further comprises a plurality of connecting members (4); the coil group A (1), the coil group B (2) and the coil group C (3) are each sleeved with a plurality of connecting members (4) at equal intervals, thereby fixing the three magnetic induction coil groups.

3. The three-axis constant magnetic field generating device according to claim 2, characterized in that: include: The lower end surfaces of the multiple connecting members (4) are fixedly connected to a rectangular base (5), and three magnetic induction coil groups are vertically arranged on the base (5).

4. The three-axis constant magnetic field generating device according to claim 3, characterized in that: include: The connecting member (4) is a long rectangular frame, in which a plurality of connecting strips are provided, and the connecting strips divide the long rectangular frame into a plurality of panes, and the conductor coils of the three magnetic induction coil groups are inserted into the panes.

5. The three-axis constant magnetic field generating device according to claim 2, characterized in that: include: A cylinder (6) is provided inside the three mutually nested magnetic induction coil groups, and the test object is transported into the cylinder (6) via a mobile platform.

6. The three-axis constant magnetic field generating device according to claim 5, characterized in that: include: The cylinder (6) is an aluminum cylinder wound with flat copper wire.

7. The three-axis constant magnetic field generating device according to claim 2, characterized in that: include: The annular end surface of the coil group A (1) is arranged parallel to the upper surface of the base (5), the coil group B (2) is arranged in the coil group A (1) and the coil group B (2) is perpendicular to the coil group A (1), and the coil group C (3) is arranged in the coil group B (2) and the coil group C (3) is perpendicular to the coil group B (2).

8. The three-axis constant magnetic field generating device according to claim 1, characterized in that: include: The mobile platform includes a guide rail (7), which is a screw mechanism driven by a motor. The screw is equipped with a loading plate (9). When the screw rotates, the loading plate (9) moves along the screw direction between the magnetic induction part and the starting end (8), and the test object is transported from the starting end (8) into or out of the magnetic induction part.

9. The three-axis constant magnetic field generating device according to claim 8, characterized in that: include: One end of the guide rail (7) is connected to the test object entrance of the magnetic induction part, and the other end of the guide rail (7) is provided with a loading plate (9). The lower surface of the loading plate (9) is provided with a mounting seat, and the mounting seat and the lead screw of the guide rail (7) are inserted through a threaded hole.

10. The three-axis constant magnetic field generating device according to claim 1, characterized in that: Also includes: Temperature transmitter, DC power supply, frequency converter, I / O controller, terminal host, air-cooled radiator; The DC power supply is connected to the magnetic induction coil group and controls the generation and dimensional transformation of the constant magnetic field together with the I / O controller. At the same time, a temperature transmitter and an air-cooled radiator are provided in the magnetic induction part to dissipate heat and monitor the coil temperature and transmit the temperature information to the terminal host, while the mobile platform is controlled by a frequency converter.

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