An electromagnetic limit mechanism based on permanent magnet electric repulsion guidance

Abstract

The present invention provides an electromagnetic limiting mechanism based on permanent magnet electric repulsion guidance, which relates to the field of high-speed magnetic levitation and electromagnetic propulsion technology. The electromagnetic limiting mechanism based on permanent magnet electric repulsion guidance is applied to a suspended high-speed electromagnetic propulsion system, comprising a permanent magnet array that moves synchronously with a linear motor mover, and a metal induction plate that cooperates with the permanent magnet array and is arranged corresponding to the double-sided stator of the linear motor; when the suspended high-speed electromagnetic propulsion system is running, the permanent magnet array interacts with the metal induction plate to generate a differential electric repulsion and maintain a predetermined guiding stiffness, completing the offset of the normal torque and normal deformation of the linear motor mover, thereby achieving contactless limiting between the linear motor mover and the double-sided stator of the linear motor in the suspended high-speed electromagnetic propulsion system in the guiding direction.

Description

Technical Field

[0001] The present invention relates to the technical field of high-speed magnetic levitation and electromagnetic propulsion, and in particular to an electromagnetic limiting mechanism based on permanent magnet electric repulsion guidance and a suspended high-speed electromagnetic propulsion system. Background Art

[0002] At present, various high-speed electromagnetic propulsion systems mostly use double-sided long primary linear motors to achieve the goal of accelerating to high or even ultra-high speeds within a short distance. This is used to generate high acceleration in the propulsion direction while offsetting the normal force and normal acceleration of the motor. The mover of this motor structure is sandwiched between the double-sided long primary stator and is interconnected with the vehicle body, skid and other carriers in a hanging manner. In the contact-type high-speed electromagnetic propulsion system, in order to protect the motor mover from normal deviation and collision with the motor stator, mechanical limit devices are generally installed at the upper and lower ends of the motor mover to prevent its normal deviation from exceeding the limit value.

[0003] However, in a suspended high-speed electromagnetic propulsion system, the entire system must be completely contactless, so the traditional mechanical limit device is no longer applicable due to contact wear. In addition, for the contactless electromagnetic guidance unit used in the suspension system, whether it is an electromagnetic attraction type active guidance or an electric repulsion type passive guidance, a certain amount of activity space must be reserved to ensure that the electromagnetic guidance unit works normally in a contactless manner. However, after the activity space of the mover limit mechanism is enlarged, this suspended mover is difficult to eliminate the force deformation of the link mechanism between the upper part of the mover and the carrier due to the asymmetric normal force of the bilateral stators or the flexibility of the material itself. This deformation will cause the lower part of the motor mover to easily collide or rub with the motor stator.

[0004] For permanent magnet motor rotors, although they are thicker and stiffer, they have negative stiffness characteristics in the normal direction, that is, the normal force of the motor increases linearly with the increase of the normal displacement of the permanent magnet rotor, and the normal torque generated will further aggravate the displacement of the lower part of the permanent magnet rotor. For induction motor rotors, although there is no normal negative stiffness characteristic, the induction rotor can be automatically centered in the steady state, but in order to improve the efficiency and effective load of the motor, the induction rotor is generally designed to be thinner and lighter, and it is difficult to eliminate the normal displacement or vibration of the rotor in a large activity space at high speed.

[0005] In short, the traditional mechanical limit device cannot play the role of protecting the motor mover in the suspended high-speed electromagnetic propulsion system, resulting in great safety hazards when the system is running at high speed. In view of this, it is necessary to study an electromagnetic limit mechanism based on permanent magnet electric repulsion guidance and a suspended high-speed electromagnetic propulsion system to solve the above technical problems. Summary of the invention

[0006] In view of the technical problem that in a suspended high-speed electromagnetic propulsion system, traditional mechanical limiting devices cannot effectively protect the bilateral linear motor movers, resulting in great safety hazards in the operation of the system, the present invention provides an electromagnetic limiting mechanism based on permanent magnet electric repulsion guidance and a suspended high-speed electromagnetic propulsion system. The electromagnetic limiting mechanism cancels out the normal torque and normal deformation of the bilateral long primary linear motor movers, thereby achieving stable, safe and reliable contactless operation of the bilateral motor movers and their carriers at high speed.

[0007] In the first aspect, an embodiment of the present invention provides an electromagnetic limit mechanism based on permanent magnet electric repulsion guidance, which is applied to a suspended high-speed electromagnetic propulsion system, comprising a permanent magnet array that moves synchronously with a linear motor mover, and a metal induction plate that cooperates with the permanent magnet array and is arranged corresponding to the double-sided stators of the linear motor;

[0008] When the suspended high-speed electromagnetic propulsion system is in operation, the permanent magnet array interacts with the metal induction plate to generate a differential electric repulsion force and maintain a predetermined guiding stiffness, thereby offsetting the normal torque and normal deformation of the linear motor mover, thereby achieving contactless limiting between the linear motor mover and the bilateral stator of the linear motor in the suspended high-speed electromagnetic propulsion system in the guiding direction.

[0009] As a further improvement of the present invention, the permanent magnet array is arranged at the bottom of the linear motor mover, including a left permanent magnet array and a right permanent magnet array that are symmetrically arranged.

[0010] As a further improvement of the present invention, the permanent magnet array also includes a permanent magnet array magnetic isolation plate arranged between the left permanent magnet array and the right permanent magnet array; the permanent magnet array magnetic isolation plate is arranged in the form of a whole piece of magnetic conductive material close to the back of the left permanent magnet array and the right permanent magnet array.

[0011] As a further improvement of the present invention, the metal induction plate is made of conductive material, and includes a left metal induction plate and a right metal induction plate which are bilaterally symmetrically arranged and cooperate with the left permanent magnetic array and the right permanent magnetic array respectively.

[0012] As a further improvement of the present invention, the permanent magnet array adopts a symmetrically arranged Halbach structure.

[0013] As a further improvement of the present invention, the permanent magnet array adopts a nine-pole Halbach structure arrangement, and the magnetization direction is 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°, and 360° (0°) from left to right in a counterclockwise positive order.

[0014] As a further improvement of the present invention, in the nine-pole Halbach structure, the magnets in the 90° and 270° directions are respectively used as the N pole and the S pole to form a periodic sine-wave magnetic field.

[0015] As a further improvement of the present invention, the electromagnetic limit mechanism based on permanent-magnet electric-repulsion guidance further includes a permanent-magnet array mounting base connected to the bottom of the linear motor mover and used for symmetrically mounting the permanent-magnet array; the permanent-magnet array mounting base includes left and right permanent-magnet array mounting bases.

[0016] The permanent-magnet array mounting base is made of non-magnetic material.

[0017] As a further improvement of the present invention, the electromagnetic limit mechanism based on permanent-magnet electric-repulsion guidance further includes an induction plate support base for mounting the metal induction plate; the induction plate support base is of a "U" shape and includes left and right support bases symmetrically arranged on both sides.

[0018] The induction plate support base is made of non-magnetic material.

[0019] In a second aspect, an embodiment of the present invention provides an application of an electromagnetic limit mechanism based on permanent-magnet electric-repulsion guidance in a suspended high-speed electromagnetic propulsion system.

[0020] As a further improvement of the present invention, the suspended high-speed electromagnetic propulsion system is a high-speed or ultra-high-speed suspended linear electromagnetic propulsion system such as a maglev test sled, a maglev space launch, or a vacuum pipeline maglev train.

[0021] In a third aspect, an embodiment of the present invention provides a suspended high-speed electromagnetic propulsion system, which adopts a bilateral linear motor structure and includes a linear motor mover and a bilateral linear motor stator that are arranged in cooperation with each other.

[0022] The suspended high-speed electromagnetic propulsion system further includes the above-mentioned electromagnetic limit mechanism based on permanent-magnet electric-repulsion guidance.

[0023] When the suspended high-speed electromagnetic propulsion system operates, the permanent-magnet array in the electromagnetic limit mechanism based on permanent-magnet electric-repulsion guidance interacts with the metal induction plate to generate a differential electric repulsion force and maintain a predetermined guiding stiffness, thereby canceling the normal torque and normal deformation of the linear motor mover. Thus, non-contact limitation between the linear motor mover and the bilateral linear motor stator is achieved in the guiding direction.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. The electromagnetic limit mechanism based on permanent magnetic electric repulsion guidance provided by the present invention adopts a permanent magnetic electric repulsion guidance scheme, which can keep the system contactless while realizing the limiting function. Compared with the currently commonly used mechanical support methods such as bearings, sliders, and wheelsets, it has significant technical and application advantages, and can completely overcome the fatal defects of traditional mechanical limit devices under high-speed conditions, such as severe wear, excessive noise, and severe vibration. This is the greatest feature and advantage of the present invention. It can be applied to high-speed or ultra-high-speed suspended linear electromagnetic propulsion systems such as maglev test skids, maglev space launches, vacuum pipeline maglev trains, etc., and has huge commercial prospects and application value.

[0026] 2. The electromagnetic limiting mechanism based on permanent magnet electric repulsion guidance provided by the present invention has a smaller limiting air gap, a greater electric repulsion force, and the electromagnetic limiting stiffness increases with the increase of the normal offset of the system. This feature makes it suitable for certain applications with special needs, thereby overcoming the technical defect of traditional mechanical limiting devices that the stiffness in the limiting direction, i.e., the normal direction, is fixed and cannot be adjusted due to the existence of hard contact.

[0027] 3. The electromagnetic limiting mechanism based on permanent magnet electric repulsion guidance provided by the present invention has a higher operating speed, a greater electric repulsion, that is, its limiting capacity can gradually become stronger with the increase of the system operating speed, which is extremely beneficial to the safety and stability of the system under high-speed operation, that is, it significantly improves the operating safety and stability performance of the suspended high-speed electromagnetic propulsion system, and also effectively overcomes the technical defect that once the traditional mechanical limiting device is designed and manufactured, its limiting capacity is fixed, and in order to adapt to the entire speed range, a large design margin is generally left, resulting in a large, heavy and uneconomical system.

[0028] 4. The suspended high-speed electromagnetic propulsion system provided by the present invention adopts an electromagnetic limiting mechanism based on permanent magnet electric repulsion guidance to complete the offset of the normal torque and normal deformation of the double-sided long primary linear motor mover, thereby realizing stable, safe and reliable contactless operation of the double-sided linear motor mover and its carrier at high speed, effectively overcoming the technical defect that the traditional mechanical limiting device cannot effectively protect the double-sided linear motor mover, resulting in great safety hazards in the operation of the system.

[0029] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings used in the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a schematic diagram of a two-dimensional structure of a typical embodiment of the present invention;

[0032] Figure 2 It is a partially enlarged schematic diagram of a three-dimensional structure of a typical embodiment of the present invention;

[0033] Figure 3 The diagram is a schematic diagram of the arrangement and magnetization of the permanent magnet array used in a typical embodiment of the present invention;

[0034] Figure 4 A schematic diagram of the relationship between the electric repulsive force generated by the electromagnetic limiting mechanism provided by the present invention in an electric suspension state, the limiting air gap and the operating speed.

[0035] Description of reference numerals:

[0036] 1. Maglev vehicle frame; 2. Suspension guide module; 3. Linear motor mover; 4. Linear motor bilateral stator; 5. Track infrastructure structure;

[0037] 6. Permanent magnetic array on the left and its mounting base; 7. Permanent magnetic array on the right and its mounting base; 8. Magnetic isolation plate of permanent magnetic array; 9. Metal induction plate on the left; 10. Metal induction plate on the right; 11. Support base of metal induction plate;

[0038] 61. Left permanent magnetic array; 62. Left permanent magnetic array mounting base;

[0039] 71. Right permanent magnet array; 72. Right permanent magnet array mounting base. DETAILED DESCRIPTION

[0040] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" in the specification and claims of the present invention and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0042] In the description of the embodiments of the present invention, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0043] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0044] In the description of the embodiments of the present invention, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0045] In the description of the embodiments of the present invention, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0046] In the description of the embodiments of the present invention, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention.

[0047] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0048] In view of the fact that in a suspended high-speed electromagnetic propulsion system, traditional mechanical limiting devices cannot effectively protect the bilateral linear motor movers, resulting in great safety hazards in the operation of the system, the present invention provides an electromagnetic limiting mechanism based on permanent magnet electric repulsion guidance and a suspended high-speed electromagnetic propulsion system. The electromagnetic limiting mechanism cancels out the normal torque and normal deformation of the bilateral long primary linear motor movers, thereby realizing stable, safe and reliable contactless operation of the bilateral linear motor movers and their carriers at high speed.

[0049] Please refer to Figure 1 As shown, it is a two-dimensional structural schematic diagram of a typical embodiment of the present invention, which mainly includes a suspended high-speed electromagnetic propulsion system and an electromagnetic limiting mechanism based on permanent magnet electric repulsion guidance.

[0050] The suspended high-speed electromagnetic propulsion system includes a magnetic levitation vehicle frame 1, a suspension guide module 2, a linear motor mover 3, a linear motor bilateral stator 4, a track infrastructure structure 5, and an electromagnetic limit mechanism based on permanent magnet electric repulsion guidance.

[0051] Specifically, there are two C-shaped bracket structures on the left and right sides of the lower part of the magnetic levitation vehicle frame 1, and two sets of suspension guide modules 2 are installed on the two C-shaped bracket structures. Each set of suspension guide modules 2 includes an upper suspension electromagnet, a lower suspension electromagnet, a guide electromagnet, and three magnetic track plates that produce electromagnetic force with them. The three magnetic track plates are installed and fixed on the three corresponding direction functional surfaces of the upper inverted L-shaped side arm of the track infrastructure structure 5. The two sets of suspension guide modules 2 rely on differential vertical suspension force ( z axis) and differential lateral guidance ( y The magnetic levitation vehicle frame 1 and the linear motor mover 3 are suspended together, so that they are in a non-mechanical contact state with the linear motor double-sided stator 4 and the track infrastructure structure 5. The linear motor mover 3 interacts with the linear motor double-sided stator 4 installed and fixed on the track infrastructure structure 5 to generate electromagnetic propulsion or braking force ( x axle), driving the entire maglev vehicle to achieve maneuvers such as starting, accelerating, decelerating, and stopping.

[0052] In order to offset the normal electromagnetic force and other normal interference forces of the linear motor mover 3, an electromagnetic limiting mechanism adopting a permanent magnet electric repulsion guidance scheme (based on permanent magnet electric repulsion guidance) is installed at the lower part of the linear motor mover 3, including a permanent magnet array that moves synchronously with the linear motor mover 3, and a metal induction plate that cooperates with the permanent magnet array and is arranged corresponding to the double-sided stator 4 of the linear motor.

[0053] The permanent magnet array specifically includes: a left permanent magnet array and its mounting base 6 , a right permanent magnet array and its mounting base 7 , and a permanent magnet array magnetic isolation plate 8 .

[0054] The metal induction plate includes a left metal induction plate 9, a right metal induction plate 10, and a metal induction plate support base 11.

[0055] During the movement of the maglev vehicle body of the suspended high-speed electromagnetic propulsion system, the left permanent magnet array and its mounting base 6 disposed at the lower part (bottom) of the linear motor mover 3 and the right permanent magnet array and its mounting base 7 respectively interact electromagnetically with the left metal induction plate 9 and the right metal induction plate 10 mounted and fixed on the metal induction plate support base 11, generating a pair of differential normal ( y axial) electric repulsive forces, so that the linear motor mover 3 maintains a certain gap from the linear motor double-sided stator 4 during the movement, so as to achieve non-contact limit of the entire maglev vehicle in the guiding direction.

[0056] Please refer to Figure 2 As shown, it is a partial enlarged three-dimensional structure schematic diagram of the above typical embodiment of the present invention. Among them, the left permanent magnet array and its mounting base 6 disposed at the lower part (bottom) of the linear motor mover 3 are composed of two parts, namely a left permanent magnet array 61 and a left permanent magnet array mounting base 62. The right permanent magnet array and its mounting base 7 disposed at the lower part (bottom) of the linear motor mover 3 are composed of two parts, namely a right permanent magnet array 71 and a right permanent magnet array mounting base 72. Both the left permanent magnet array 61 and the right permanent magnet array 71 adopt the Halbach structure arrangement form that can improve the magnetic field utilization rate, and are respectively encapsulated in the left permanent magnet array mounting base 62 and the right permanent magnet array mounting base 72.

[0057] In some specific embodiments, the permanent magnet array magnetic isolation plate 8 is made of excellent magnetic conductors such as silicon steel or pure iron, and is arranged closely against the back surfaces of the left permanent magnet array and its mounting base 6 and the right permanent magnet array and its mounting base 7 in the form of a whole magnetic conductor, so as to further improve the magnetic field distribution of the left permanent magnet array 61 and the right permanent magnet array 71, enhance the magnetic field on the acting surface side while weakening the magnetic field on the non-acting surface side of the other side, and can play a certain magnetic isolation role for the left permanent magnet array 61 and the right permanent magnet array 71, reducing the magnetic force coupling between them.

[0058] Specifically, the metal induction plate support base 11 is of a "U" shape structure, including left and right support bases symmetrically arranged on both sides; the left metal induction plate 9 and the right metal induction plate 10 are made of excellent conductors such as solid copper or aluminum materials, and are respectively fixed on the inner surfaces of the left and right support bases of the metal induction plate support base 11, so as to respectively cooperate with the left permanent magnet array 61 and the right permanent magnet array 71 in a facing manner to generate differential electric repulsive forces during the operation of the suspended high-speed electromagnetic propulsion system.

[0059] The left permanent magnet array mounting base 62, the right permanent magnet array mounting base 72 and the metal induction plate support base 11 are all made of non-magnetic materials such as stainless steel or aluminum alloy, and provide installation support foundations for the left permanent magnet array 61, the right permanent magnet array 71 and the left metal induction plate 9, and the right metal induction plate 10, respectively, and ensure a certain structural rigidity to reduce stress deformation.

[0060] See also Figure 3 As shown, it is a schematic diagram of the arrangement and magnetization of the permanent magnet array used in the above typical embodiment of the present invention. Among them, the permanent magnet array adopts a Halbach structure arrangement that can improve the utilization rate of the magnetic field, and is respectively fixed to the left and right sides of the permanent magnet array mounting base.

[0061] In some specific embodiments, the permanent magnet array adopts the commonly used nine-pole Halbach arrangement, and the magnetization directions of each magnet are 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°, and 360° (0°) from left to right in a counterclockwise order. After the nine magnets are assembled, the magnets at 90° and 270° are used as the N pole and S pole, respectively, to form a periodic sinusoidal magnetic field, so that the magnetic field at the top of the array (active surface) is enhanced and the magnetic field at the bottom of the array (non-active surface) is weakened, so as to improve the overall utilization rate of the magnetic field. The left permanent magnet array 61 and the right permanent magnet array 71 both adopt this arrangement. Figure 3 The structural arrangement shown in the figure is installed at the lower part (bottom) of the linear motor mover 3 so that their respective action surfaces are respectively facing the front of the left metal induction plate 9 and the right metal induction plate 10 ( y The axes are aligned to generate a differential electromotive repulsion force that keeps the motor rotor stably aligned during movement.

[0062] In some other embodiments, the permanent magnet array may also adopt a five-pole Halbach arrangement, and the magnetization directions of each magnet are 0°, 90°, 180°, 270°, and 360° (0°) from left to right in a counterclockwise positive order. In addition, those skilled in the art know that the five-pole and nine-pole mentioned in the embodiments are one cycle. If the cycles are increased in specific application implementations, the number of magnets may be increased accordingly, and is not limited to the number in the above embodiments.

[0063] When the suspended high-speed electromagnetic propulsion system is in operation, the left permanent magnet array 61 and the right permanent magnet array 71 respectively react with the left metal induction plate 9 and the right metal induction plate 10 installed on the metal induction plate support base 11 to generate a differential electric repulsion force and maintain a certain guiding stiffness, which offsets the normal electromagnetic force and other normal interference forces of the linear motor mover 3, so that the linear motor mover 3 maintains a certain gap with the bilateral stators 4 of the linear motor during movement, so as to realize contactless limiting of the system in the guiding direction.

[0064] The electromagnetic limiting mechanism provided by the present invention is based on the permanent magnet electric repulsion guidance. The smaller the limiting air gap, the greater the electric repulsion. As the normal offset of the system increases, the electromagnetic limiting stiffness also increases. The higher the system operating speed, the greater the electric repulsion, that is, its limiting ability can gradually become stronger with the increase of the system operating speed. This is mainly based on the basic characteristics of the electromagnetic limiting mechanism's own electric suspension, that is, a permanent magnet moves above a metal plate. Due to the principle of electromagnetic induction, eddy currents will be generated inside the metal plate, and the eddy currents will then form a magnetic field, namely, an eddy current magnetic field. The induced eddy current magnetic field is approximately mirror-symmetrical with the original permanent magnet magnetic field. The two magnetic fields interact with each other, and are manifested as two forces at a macroscopic level: one is the electric repulsion. F , which is opposite to the direction of the permanent magnet’s own gravity, that is, perpendicular to the moving permanent magnet upward; the second is the electric resistance Fx , which is opposite to the direction of motion of the permanent magnet, such as Figure 4 The analytical calculation of the above two forces is related to many parameters such as the structure and electromagnetic parameters of the permanent magnet and the metal plate, the speed of the magnet movement, the distance between the magnet and the metal plate, etc. Qualitatively speaking, for a given set of permanent magnets and metal plates, that is, their structure and electromagnetic parameters are determined, then the electromotive force repulsion is F The speed of the magnet v Basically positively correlated (i.e. v The bigger, F The larger the distance between the magnet and the metal plate, the d Negatively correlated (i.e. d The smaller, F the larger the size).

[0065] The electromagnetic limiting mechanism based on permanent magnet electric repulsion guidance provided by the present invention has the following effects on the suspension function or guidance function of the suspended high-speed electromagnetic propulsion system itself: it has no effect on the suspension function of the system itself, because the directions of the two forces are orthogonal; it has a promoting effect on the guidance function of the system itself, and can enhance the contactless guidance capability of the system.

[0066] In summary, the present invention provides an electromagnetic limiting mechanism based on permanent magnet electric repulsion guidance and a suspended high-speed electromagnetic propulsion system, which relates to the field of high-speed magnetic levitation and electromagnetic propulsion technology. The electromagnetic limiting mechanism based on permanent magnet electric repulsion guidance is applied to a suspended high-speed electromagnetic propulsion system, including a permanent magnet array that moves synchronously with a linear motor mover, and a metal induction plate that cooperates with the permanent magnet array and is arranged corresponding to the double-sided stator of the linear motor; when the suspended high-speed electromagnetic propulsion system is running, the permanent magnet array interacts with the metal induction plate to generate a differential electric repulsion and maintain a predetermined guiding stiffness, thereby completing the offset of the normal torque and normal deformation of the linear motor mover, thereby achieving contactless limiting between the linear motor mover and the double-sided stator of the linear motor in the suspended high-speed electromagnetic propulsion system in the guiding direction. The electromagnetic limiting mechanism completes the offset of the normal torque and normal deformation of the double-sided long primary linear motor mover, and realizes the stable, safe and reliable contactless operation of the double-sided linear motor mover and its carrier at high speed, and can be applied to high-speed or ultra-high-speed suspended linear electromagnetic propulsion systems such as magnetic levitation test sleds, magnetic levitation space launches, and vacuum pipeline magnetic levitation trains.

[0067] It should be noted that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present invention are all included in the technical scope of the present invention. In addition, without departing from the scope of the main purpose of the present invention, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present invention.

Claims

1. An electromagnetic limit mechanism based on permanent magnet electric repulsion guidance, characterized in that: Applied to a suspended high-speed electromagnetic propulsion system, it includes a permanent magnet array that moves synchronously with the linear motor mover, and metal induction plates that are symmetrically arranged on both sides and cooperate with the permanent magnet array; When the suspended high-speed electromagnetic propulsion system operates, the permanent magnet array and the metal induction plates interact with each other to generate a differential electric repulsive force and maintain a predetermined guiding stiffness, completing the cancellation of the normal torque and normal deformation of the linear motor mover. Thus, non-contact limiting between the linear motor mover and the bilateral stators of the linear motor in the guiding direction is achieved; The permanent magnet array is arranged at the bottom of the linear motor mover, and includes a left permanent magnet array and a right permanent magnet array that are symmetrically arranged; The permanent magnet array further includes a permanent magnet array magnetic isolation plate arranged between the left permanent magnet array and the right permanent magnet array; The metal induction plates include a left metal induction plate and a right metal induction plate that are symmetrically arranged on both sides and cooperate with the left permanent magnet array and the right permanent magnet array respectively; The electromagnetic limiting mechanism based on permanent magnet electric repulsive force guiding further includes an induction plate support base for installing the metal induction plates.

2. The electromagnetic limiting mechanism based on permanent magnetic electric repulsion guidance according to claim 1 is characterized in that: The permanent magnet array magnetic isolation plate is arranged closely against the backs of the left permanent magnet array and the right permanent magnet array in the form of a whole piece of magnetic conductive material.

3. The electromagnetic limiting mechanism based on permanent magnetic electric repulsion guidance according to claim 1 is characterized in that: The metal induction plates are made of conductive material.

4. The electromagnetic limiting mechanism based on permanent magnetic electric repulsion guidance according to claim 1 is characterized in that: The permanent magnet array adopts a Halbach structure arrangement form with left-right symmetry.

5. The electromagnetic limiting mechanism based on permanent magnetic electric repulsion guidance according to claim 4 is characterized in that: The permanent magnet array adopts a nine-pole Halbach structure arrangement form, and the magnetization directions of the magnets are 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°, 360° in sequence from left to right in the order of counterclockwise being positive; In the nine-pole Halbach structure, the magnets in the 90° and 270° directions are used as the N pole and the S pole respectively to form a periodic sine wave magnetic field.

6. The electromagnetic limiting mechanism based on permanent magnetic electric repulsion guidance according to claim 1 is characterized in that: The electromagnetic limiting mechanism based on permanent magnet electric repulsive force guiding further includes a permanent magnet array mounting base that is connected to the bottom of the linear motor mover and used for symmetrically installing the permanent magnet array; the permanent magnet array mounting base includes left and right permanent magnet array mounting bases that are symmetrically arranged; The permanent magnet array mounting base is made of non-magnetic material.

7. The electromagnetic limiting mechanism based on permanent magnetic electric repulsion guidance according to claim 3 is characterized in that: The induction plate support base is of a "U" shape structure and includes left and right support bases that are symmetrically arranged on both sides; The induction plate support base is made of non-magnetic material.

8. Application of an electromagnetic limiting mechanism based on permanent magnetic electric repulsion guidance as claimed in any one of claims 1 to 7, characterized in that: Application in a high-speed or ultra-high-speed suspended linear electromagnetic propulsion system.

9. A suspended high-speed electromagnetic propulsion system, characterized in that: Adopting a bilateral linear motor structure, including a linear motor mover and bilateral stators of the linear motor that are cooperatively arranged; The suspended high-speed electromagnetic propulsion system further includes an electromagnetic limiting mechanism based on permanent magnet electric repulsive force guiding as described in any one of claims 1 to 7; When the suspended high-speed electromagnetic propulsion system operates, the permanent magnet array in the electromagnetic limiting mechanism based on permanent magnet electric repulsive force guiding interacts with the metal induction plates to generate a differential electric repulsive force and maintain a predetermined guiding stiffness, completing the cancellation of the normal torque and normal deformation of the linear motor mover. Thus, non-contact limiting between the linear motor mover and the bilateral stators of the linear motor is achieved in the guiding direction.

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