Slotless iron-core flat linear motor with magnetic levitation guidance

Abstract

The present invention discloses a slotless iron-core flat linear motor with magnetic levitation guidance. The traveling wave magnetic field generated by the primary is cut by the secondary, and the electromotive force and current generated by the interaction with the air gap magnetic field generate a linear driving force. The primary includes a primary coil, and the secondary includes a superconducting coil. The multiple primary coils are arranged in a linear column in a parallel order of the magnetic field. Superconducting coils of corresponding magnetic poles are suspended at both ends of the primary iron core. The superconducting coils generate linear displacement with the driving force, so that the primary ferromagnetism corresponding to the two adjacent primary coils and their respective ends forms a complete magnetic line closed loop according to the direction of magnetic field generation. The superconducting coils on the two end sides are fixed on the mover, and the mover and the stator are guided by a magnetic levitation structure arranged in a column direction parallel to the primary coil. The magnetic levitation structure includes: a track unit spliced ​​in the magnetization direction of the Hellbach array according to the topological magnetic focusing topology, and a superconducting coil suspended by electromagnetic repulsion with the track unit.

Description

Technical Field

[0001] The invention relates to a linear ejection motor subsystem, in particular to a magnetic suspension guided slotless iron core flat linear motor. Background Art

[0002] A magnetically levitated, slotless, ironcore, flat linear motor is a transmission device that converts electrical energy directly into linear motion without any intermediate conversion mechanism. It can be considered a structural variation of a rotary motor: a rotary motor cut radially apart and then flattened.

[0003] Compared with rotary motors, magnetic levitation-guided slotless iron-core flat linear motors have the following main features: First, the structure is simple. Since magnetic levitation-guided slotless iron-core flat linear motors do not require additional devices to convert rotary motion into linear motion, the structure of the system itself is greatly simplified, and the weight and volume are greatly reduced; second, the positioning accuracy is high. Where linear motion is required, magnetic levitation-guided slotless iron-core flat linear motors can achieve direct transmission, thereby eliminating various positioning errors caused by intermediate links, so the positioning accuracy is high. If microcomputer control is used, the positioning accuracy of the entire system can be greatly improved; third, the response speed is fast, the sensitivity is high, and the follow-up performance is good; fourth, the operation is safe and reliable, and the service life is long.

[0004] Generally, magnetically driven and guided slotless ironcore flat linear motors can be categorized based on the shape of the mover into cylindrical magnetically driven and guided slotless ironcore flat linear motors, U-shaped magnetically driven slotless ironcore flat linear motors, and flat-plate magnetically driven slotless ironcore flat linear motors. Flat-plate magnetically driven slotless ironcore flat linear motors can be further categorized into slotless ironcore flat motors, slotless ironcore flat motors, and slotted ironcore flat motors.

[0005] In slotless ironcore flat motors, in addition to mounting the iron core on a steel lamination structure, which is then mounted on an aluminum backplane or other non-magnetic structural materials such as austenitic stainless steel, the iron laminations also serve to direct the magnetic field and increase thrust. The high relative magnetic permeability of the iron core material effectively increases the magnetic field within the core and in the air gap, increasing the attraction between the magnetic track and the rotor. This increases the thrust generated by the motor, and the lamination structure generates joint force. Therefore, slotless ironcore motors have greater thrust than slotless ironcore motors.

[0006] For example, the Chinese invention patent "Dual-stator, no-motor yoke, permanent-magnet magnetic levitation-guided slotless iron-core flat linear motor with oriented silicon steel sheets," application number 2017113908761, discloses a U-shaped dual-stator structure with a magnetic levitation-guided slotless iron-core flat linear motor. Its rotor coil generates linear displacement along a guide rail under a thrust. While this solution can improve the thrust density per unit volume of a magnetic levitation-guided slotless iron-core flat linear motor, the rotor in this patent is constructed from oriented silicon steel sheets laminated into an iron core block and then wound with copper wire, resulting in a relatively large rotor mass. This mass directly affects the effect of thrust on the rotor. Furthermore, the rotor coil in this patent requires connection to a power supply to ensure current flow. While this patent works well in specific reciprocating motion applications, the long-stator linear motor described in this patent for electromagnetic catapults would require unnecessary manufacturing complexity due to wiring issues between the rotor and the power supply. The thrust displacement performed by the rotor coil will increase the structural load and control difficulty, especially for high-precision control application scenarios. The displacement inertia of the rotor coil is large, which will have a great impact not only on motor control but also on operation accuracy. Summary of the Invention

[0007] The purpose of the present invention is to provide a magnetically levitated, slotless, iron-core flat linear motor, which solves many problems of stator coil displacement and solves the problems of complex overall structure and low operating efficiency.

[0008] The slotless long-stator linear motor covered by this patent is used in electromagnetic catapult systems, which need to accelerate 0.2-20 ton drones or carrier-based aircraft to a terminal velocity of ≥28.2 m / s. Therefore, the moving parts should be as light as possible. The advantages of this patent lie in the use of a constant DC current through a DC superconducting coil to generate a stable magnetic field far higher than that of a permanent magnet, and the increase in the air gap width to reduce the end effect caused by the short secondary. At the same time, a U-shaped double-secondary structure is used to offset the normal suction force of the motor to ensure system robustness. In addition, the use of a bilateral permanent magnet synchronous linear motor can also provide approximately twice the thrust of a single-sided linear motor, resulting in a greater thrust density.

[0009] Therefore, the technical points adopted include:

[0010] 1. Reduce the mass of the mover and increase acceleration;

[0011] 2. Large magnetic field and large air gap, increasing the air gap reduces the end effect, increases the air gap magnetic density and improves the thrust density;

[0012] 3. U-shaped double mover without magnetic yoke to offset the unilateral electromagnetic pull;

[0013] 4. The stator has no magnetic yoke and the magnetic circuit does not rotate. Anisotropic magnetic materials with better magnetic properties, such as oriented silicon steel, can be used to improve system density.

[0014] 5. Using superconducting suspension (electrodynamic suspension) system for stable suspension and frictionless contact;

[0015] 6. Magnetic guide rail array.

[0016] Specifically, the present invention provides a slotless, iron-core, flat-plate linear motor with magnetic levitation guidance. The motor comprises a primary and a secondary. The primary primarily comprises stator coils, while the secondary primarily comprises ferromagnetic movers. Compared to existing technologies, the most notable structural difference lies in the use of coils, which are relatively heavy and difficult to arrange and wire, as the stator, while the relatively lightweight and easily disassembled ferromagnetic movers serve as the displacement element.

[0017] In this solution, the primary includes the primary coil on the stator, and the secondary includes the superconducting coil on the mover.

[0018] The primary coil comprises a silicon steel sheet and a winding coil; the winding coil is wound on the oriented silicon steel sheet.

[0019] When multiple primary coils are arranged in a straight line in a parallel magnetic field order, a magnetic field is generated according to Ampere's law (right-hand screw rule) when the coils are energized.

[0020] Superconducting coil, the superconducting coil is arranged on the back iron.

[0021] Restrictions on superconducting coil materials include:

[0022] 1. Superconducting tape is made of alloy superconducting materials such as yttrium, lanthanum, barium, or niobium. The criterion for selecting alloy superconductors is whether they can provide a high superconducting transition critical temperature, and the preferred type is high-temperature superconductor;

[0023] 2. The racetrack superconducting coil needs to be treated with interlayer insulation during winding. An insulating layer can be made on the surface of the high-temperature tape, or the superconducting tape can be impregnated with insulating resin materials such as epoxy resin when winding.

[0024] 3. The superconducting layer in the superconducting tape is a brittle material and is easily damaged. Therefore, during the winding process of the superconducting racetrack tape winding, the winding curvature must be strictly controlled to ensure that the superconducting material does not suffer brittle damage due to the large curvature winding. The judgment standard is that the elongation of the material caused by the curvature is ≤0.2%

[0025] When superconducting coils with magnetic lines of force in the same direction are arranged at the two magnetic ends of the stator coil, an enhanced magnetic field is formed, and the path of the magnetic lines of force is from the current N pole to the corresponding S pole.

[0026] If two adjacent primary coils are grouped together, and the magnetic field directions of the two coils are different, and there are corresponding magnets at both ends of each primary coil, these two adjacent groups of units will form a complete closed loop of magnetic field lines based on the direction of the magnetic field.

[0027] Therefore, when the traveling wave magnetic field generated by the primary coil is energized, the electromotive force and induced current generated by the superconducting coil when the traveling wave magnetic field is cut interact with the air gap magnetic field to generate thrust. Since the stator coil is fixed, the corresponding mover ferromagnetic force will generate a linear driving force.

[0028] Specifically, the ejection power of the mover is based on the principle of electromagnetic ejection. In the closed loop of magnetic lines of force generated by the primary coil and the superconducting coil, the closed loop of magnetic lines of force passing through the winding center of the superconducting coil is coupled with the magnetic field of the primary coil at the corresponding position and generates an induced current flowing in the same direction of the driving force. This magnetic field generates thrust on the charges flowing in it as a ejection force.

[0029] In this solution, the primary coil is mounted on a stator base with two upwardly protruding vertical ends formed on its top surface. The primary coil is installed in a straight slot formed by these two vertical ends, with the top of the slot sealed. Correspondingly, through-holes are provided in the vertical ends for embedded installation. The primary coil is constructed from oriented silicon steel sheets laminated with the rolling direction parallel to the magnetic field lines, and the ends of the silicon steel sheets are embedded in the through-holes.

[0030] The superconducting coil corresponds to the extreme end of the primary coil, and the superconducting coil is fixed on an inverted U-shaped rotor plate to ensure that the superconducting coil and the primary coil are at the same height and meet the appropriate air gap requirements.

[0031] A guide structure is arranged between the mover plate and the stator seat. Traditional guide structures mostly use linear guides with tolerance matching. In this solution, a magnetic suspension structure is used to achieve motion guidance.

[0032] The magnetic levitation structure includes: track units spliced ​​together according to the magnetization direction of the Hellbach array based on the magnetic topology structure, and superconducting coils suspended by electromagnetic repulsion formed with the track units.

[0033] The permanent magnet track units are spliced ​​into a straight track according to the principle of enhancing the unilateral magnetic field based on the different magnetizing directions. At the same time, corresponding superconducting racetrack coils are arranged on the mover plate to generate a suspension force with the stable magnetic field generated by the constant surrounding current.

[0034] Preferably, the permanent magnet track unit in this solution is a prism with an equilateral triangular cross-section, and the prism is inserted into a frame with a 60° reciprocating angle to form a linear arrangement.

[0035] Based on the principles of the Heilbach array, each permanent magnet track unit has its own magnetization direction. In this solution, two directions are preferred: magnetization parallel to the base and magnetization perpendicular to the base. By combining these two units, a basic magnetic levitation track can be assembled.

[0036] Preferably, the electromagnet track unit in this solution is an electromagnet also having a regular triangular prism arrangement, and the regular triangular prism is inserted into a frame with a 60° reciprocating angle to form a linear arrangement.

[0037] To satisfy the unidirectional magnetic field enhancement of the electromagnet, the direction of movement is determined. According to the right-hand screw rule, the direction of the outer side of the prism that needs to be enhanced is determined, and the magnetic forces on other surfaces are offset against each other inward into the prism according to the right-hand screw rule.

[0038] According to the above-mentioned magnetic levitation structure, the magnetic levitation height is controlled between 5-20 mm, which can be stably controlled and quickly responded.

[0039] Building on the above, this solution also incorporates auxiliary wheels for pre-launch assistance. Specifically, the mover plate is equipped with auxiliary wheels that extend and retract via a cylinder. Inward depressions are formed on both sides of the stator base, creating an I-shaped main body. Guide grooves for the auxiliary wheels are located within these depressions, aligning with the direction of movement of the mover.

[0040] Based on the above basic structure, this solution preferably arranges the superconducting coils at both ends in pairs, with the magnetic poles of the two opposing superconducting coils facing each other, and the magnetic poles of the two adjacent superconducting coils at the same end facing each other. This way, closed magnetic lines of force are formed between the two coils each time they move.

[0041] Preferably, the spacing between adjacent primary coils is 20% to 30% of the corresponding width of the silicon steel sheet. The farther apart the primary coils are, the weaker the air gap magnetic field generated. Furthermore, the pole piece must be thinner to ensure a uniform air gap magnetic field. If the primary coils are spaced closely together, assembly and manufacturing become more difficult, the arrangement of cooling water channels becomes more challenging, water flow is reduced, and cooling efficiency is poor.

[0042] Preferably, the intervals between the superconducting coils need to ensure that, when moved to any position, two adjacent superconducting coils can generate a closed loop of magnetic field lines with the two primary coils at the current position.

[0043] Preferably, the air gap formed between the superconducting coil and the end surface of the silicon steel sheet is 1 to 5 mm.

[0044] Based on the above structure, this solution can be used as a linear ejection motor subsystem for shipborne electromagnetic catapult systems. Generally, shipborne electromagnetic catapult systems are composed of energy storage / generation subsystems, power regulation subsystems, energy distribution subsystems, linear ejection motor subsystems, and ejection control subsystems. The linear ejection motor subsystem is a megawatt-class system, and each ejection requires about 15 minutes of preparation time. During the preparation process, the linear motor rotor and the superconducting coil used for suspension in this solution are not energized, and slide in the slide groove arranged on the I-shaped base through auxiliary wheels, and reach the designated position through the auxiliary drive device.

[0045] During launch preparation, the cold head of a cryogenic refrigerator at a designated location cools the inner chamber of the Dewar cavity housing the superconducting coils. Simultaneously, a high current is pumped or passed through the superconducting coils via a connection port, such as a magnetic flux pump. The refrigerator must be positioned vertically, with the bottom copper terminal acting as the so-called "coldhead." After cooling is complete, the coldhead can be removed from the interface of the cooling cavity, sealing the cavity and maintaining the desired temperature. This process aims to field-cool the superconducting coils and bring them into a superconducting state. The target temperature is between 4K and 77K, with a preferred range of 20-40K. The superconducting coils of the rotors used in electromagnetic catapults need to be field-cooled to a state above the critical state. The cooling method can adopt the above-mentioned low-temperature refrigerator cold head heat transfer cooling, or adopt the distributed cooling cooling form, first using a small amount of gaseous nitrogen for cooling; then a large amount of gaseous nitrogen for cooling; then liquid nitrogen for cooling; finally, gaseous helium for cooling. If the cooling target temperature is low, liquid helium can be used for cooling in the last step.

[0046] The evaluation and selection criteria for the target cooling temperature are as follows: 1) A lower target cooling temperature results in a higher current flowing through the superconducting coil, generating a stronger magnetic field and contributing to increased thrust density; 2) A lower target cooling temperature requires greater cooling system power and significantly increases costs. Therefore, both 1) and 2) need to be considered comprehensively.

[0047] During the launch preparation phase, the cooling device's cold head or cooling interface is disconnected, the rotor cooling cavity is sealed, and the superconducting coil enters a superconducting state. Simultaneously, the superconducting coil is fully charged. Due to its extremely low resistance, the current can continuously circulate through the racetrack-like superconducting windings, forming a stable magnetic field. At this point, the charging interface is disconnected. With the superconducting coil fully charged, the magnetic field beneath the linear motor's rotor interacts with the levitation magnetic field on the base, and the entire rotor enters a stable magnetic levitation state.

[0048] The horizontal cylinder connected to the center of the auxiliary wheel is pushed out, and the tilted cylinder connected to the center of the auxiliary wheel is sucked in. At this time, the auxiliary wheel is lifted and the auxiliary guide rail is no longer effective. At this point, the ejection preparation phase is completed;

[0049] The auxiliary starting component drives the mover, and a large pulse traveling wave current is passed through the stator copper wire. The Ampere force works on the mover as a whole, causing the mover to obtain a large acceleration, thereby ejecting the carrier-based aircraft carried on the mover out of the guide rail.

[0050] The linear synchronous motor with superconducting excitation has the advantages of high power factor, minimum power electronic conversion transpose size, and low cost; assisted by a stable magnetic levitation system that works together with electromagnetic repulsion and attraction, it will greatly increase energy utilization efficiency.

[0051] The advantages of the present invention are: the structure is reasonably arranged,

[0052] 1. The use of ferromagnetic stator coils and movers significantly optimizes the structure, resolving many challenges with stator coil placement. Simultaneously, the mover mass is significantly reduced, alleviating stress on the system and structure. Furthermore, the control load is low and the response speed is fast.

[0053] 2. It adopts a magnetic levitation guide design, which completes the magnetic field construction through unit combination and achieves the magnetic levitation effect, reducing structural friction and improving operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0055] Figure 1 It is a structural schematic diagram of the present invention;

[0056] Figure 2 It is a side view of the structure of the present invention;

[0057] Figure 3 Schematic diagram of the coordination relationship between the stator coil and the mover ferromagnetic;

[0058] Figure 4 Schematic diagram of magnetic lines of force between the stator coil and the superconducting coil;

[0059] Figure 5 This is the principle diagram of electromagnetic thrust generation;

[0060] Figure 6 This is a schematic diagram of the internal components of the maglev track;

[0061] Figure 7 The schematic diagram of the magnetic levitation track for permanent magnets;

[0062] Figure 8 This is the schematic diagram of the internal cooling scheme for the mover;

[0063] Figure 9 This is a diagram of the magnetic field rotation inside the motor core;

[0064] Figure 10The BH curve comparison diagram of oriented steel and non-oriented steel;

[0065] Figure 11 This is a schematic diagram of the principle of the magnetic levitation track;

[0066] Figure 12 This is a schematic diagram of the principle of the magnetic levitation track in this scheme;

[0067] Figure 13 The schematic diagram of the principle of the magnetic levitation track of the optimal solution;

[0068] Among them: 1. Stator; 2. Mover; 3. Auxiliary wheel; 4. Stator coil; 5. Superconducting coil; 6. Track unit. DETAILED DESCRIPTION

[0069] Preferred embodiment 1 of the present invention:

[0070] The linear motor comprises a stator 1 and a mover 2, wherein the stator 1 is provided with a coil and the mover 2 is provided with a superconducting coil 5. Therefore, during operation, the mover is light and flexible, and it is relatively easy to arrange sensors or connect coils on the stator coils.

[0071] The displacement guidance between the stator 1 and the mover 2 is achieved through a magnetic levitation structure. The arrangement direction of the magnetic levitation track is the same as that of the stator coil. The mover 2 is also provided with a superconducting coil 5 that cooperates with the magnetic levitation track. Therefore, the mover 2 can achieve guided displacement with low friction and noise.

[0072] Specifically,

[0073] The stator 1 includes a stator base. In this embodiment, the upper end of the stator base is flat, with through-holes formed on either side of the vertical end. The stator coils 4 are embedded in the through-holes through the ends of their center-oriented silicon steel sheets. The stator coils 4 are arranged in a straight line, ensuring that the magnetic fields of adjacent stator coils 4 are parallel.

[0074] The stator has no magnetic yoke and the magnetic circuit does not rotate. It can use anisotropic magnetic materials with better magnetic properties, such as oriented silicon steel, to improve the system density. Figure 9 As shown in the figure, the magnetic field rotation condition inside the motor core is shown. It can be seen that the magnetic field deviates from the rolling direction of the oriented silicon steel within 10 degrees. Figure 10 As shown in the figure, within 10° deviation from the rolling direction, the magnetic properties of oriented silicon steel are significantly better than those of traditional non-oriented silicon steel.

[0075] Therefore, in this solution, the use of oriented silicon steel laminations can better improve the system thrust density.

[0076] The spacing between adjacent stator coils 4 is 20% to 30% of the width of the oriented silicon steel sheet, preferably 25% in this embodiment.

[0077] The stator coil 4 is covered with a cover plate that isolates the magnetic field, and the two extreme ends of the stator coil 4 are exposed outside the stator base and can cooperate magnetically with the moving mover.

[0078] Both sides of the bottom of the stator seat are in the shape of a cone with inclined surfaces, and a magnetic suspension track is arranged on the inclined surface. The arrangement direction of the magnetic suspension track is the same as that of the stator coil 4.

[0079] The rotor plate is fitted on the stator seat in a "gantry" style. Superconducting coils 5 that match the stator coils in four directions are arranged on both sides of the rotor plate. The air gap formed between the superconducting coils 5 and the end faces of the silicon steel sheets is 1 to 5 mm.

[0080] A superconducting coil 5 is arranged at the bottom of the mover plate to match the magnetic levitation track. The height between the superconducting coil 5 and the magnetic levitation track is between 5-20 mm, which can be stably controlled and quickly responded.

[0081] Preferred embodiment 2 of the present invention:

[0082] The primary side includes the stator coil 4 and the secondary side includes the mover ferromagnetic.

[0083] The stator coil 4 comprises an oriented silicon steel sheet and a winding coil; the winding coil is wound on the oriented silicon steel sheet.

[0084] The mover is ferromagnetic and includes a back iron and a superconducting coil 5 ; the superconducting coil 5 is arranged on the back iron.

[0085] When the plurality of stator coils 4 are arranged in a straight line in a parallel magnetic field order, the coils will generate a magnetic field according to Ampere's law (right-hand screw rule) when energized.

[0086] When magnets with magnetic lines of force in the same direction are arranged at the two magnetic ends of the stator coil 4, an enhanced magnetic field is formed, and the path of the magnetic lines of force is from the current N pole to the corresponding S pole.

[0087] If two adjacent stator coils 4 are grouped together, the magnetic field directions of the two coils are different, and there are corresponding magnets at both ends of each stator coil 4, these two adjacent groups of units will form a complete magnetic field line closed loop according to the direction of the magnetic field.

[0088] Therefore, when the traveling wave magnetic field generated by the stator coil 4 is cut by the electromotive force and current generated by the passive ferromagnetism and acts on the air gap magnetic field, since the stator coil 4 is fixed, the corresponding active ferromagnetism will generate a linear driving force.

[0089] Preferred embodiment 3 of the present invention:

[0090] Auxiliary wheels 3 are arranged on the mover plate and are extended or retracted by a cylinder. Inward depressions are formed on both sides of the stator base, forming an I-shaped body. Guide grooves for the auxiliary wheels are arranged in the depressions. The extension direction of the guide grooves is consistent with the movement direction of the mover.

[0091] The superconducting coil of the mover cooperates with the stator coil 4, and the mover plate also maintains a guiding relationship with the stator base through a magnetic suspension structure.

[0092] The magnetic levitation structure includes: a track unit 6 spliced ​​in the magnetization direction of the Heilbach array according to the magnetic topology structure, and a superconducting coil 5 suspended by electromagnetic repulsion formed with the track unit 6.

[0093] like Figure 8 As shown, the three sets of superconducting coils are connected by a common cavity 7, which is used for cooling. The "cold head" of the refrigerator is the refrigerator's copper terminal connected to the inlet of this cavity. At the same time, a similar common cavity space can also be used to pass or pump direct current into the terminals of the superconducting coils.

[0094] According to the different magnetizing directions, the permanent magnet track units are spliced ​​into a straight track according to the principle of enhancing the unidirectional magnetic field and based on the right-hand screw rule. At the same time, corresponding permanent magnets are arranged on the mover plate to generate suspension force with it.

[0095] In this embodiment, the permanent magnet track unit is a prism with an equilateral triangular cross-section, and the prism is inserted into a frame with a 60° reciprocating angle to form a linear arrangement.

[0096] According to the principle of the Heilbach array, each permanent magnet track unit has its own magnetization direction. Figure 5 As shown, there are two directions: magnetization parallel to the bottom edge and magnetization perpendicular to the bottom edge. Based on the combination of these two units, the magnetic field can be enhanced in a single direction, thus assembling a basic magnetic levitation track.

[0097] like Figures 11-13 These three pictures are the principle diagrams of superconducting strips suspended on the guide rails. Figure 11 It can be seen that this self-stabilizing suspension system has the characteristics of automatically maintaining a stable suspension state, which is specifically reflected in: 1. When the mover moves to the right as a whole, the repulsive force of the left guide rail increases, pushing the mover back to its original position; 2. When the mover moves downward as a whole, the electromagnetic repulsive force of the same polarity repels each other due to the increase in the equivalent area, causing the mover to return to the equilibrium position as a whole; 3. When the mover moves upward as a whole, the gravity of the mover itself will be opposite to it.

[0098] Figures 11-13 This is a schematic diagram of the suspension state that the guide rail superconducting coil can present, in which the implementation case of the digital model of this patent is Figure 13The most preferred implementation case is Figure 12 suspended state.

[0099] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A slotless, iron-core, flat linear motor with magnetic levitation guidance, including: primary, secondary; The traveling wave magnetic field generated by the primary is cut by the secondary, and the electromotive force and current generated by the interaction with the air gap magnetic field generate a linear driving force. The characteristics are: the primary comprises a primary coil on the stator, and the secondary comprises a superconducting coil on the mover; the primary coil comprises an oriented silicon steel sheet, and the superconducting coil comprises a superconducting tape; Multiple primary coils are arranged in a linear array in a parallel magnetic field order; a superconducting coil of corresponding magnetic level is suspended at each end of the primary iron core; the superconducting coils are linearly displaced in response to the driving force, so that two adjacent primary coils and the superconducting coils corresponding to their respective ends form a complete closed loop of magnetic lines of force based on the directions of the magnetic fields generated by the two primary coils; the closed loop of magnetic lines of force passing through the winding center of the superconducting coils couples with the magnetic field of the primary coils at the corresponding positions and generates an induced current flowing in the direction of the driving force, and this magnetic field generates a thrust on the charges flowing therein as a catapult force; The superconducting coils at both ends are fixed on the mover, and the mover and the stator are guided by a magnetic suspension structure arranged parallel to the primary coils. The mover includes an auxiliary wheel that is pushed out or pulled back by the power source; the stator includes a guide groove that matches the auxiliary wheel; the extension direction of the guide groove is the same as the movement direction of the mover; The magnetic suspension structure includes a track unit and a superconducting coil that forms electromagnetic repulsive suspension with the track unit; The auxiliary wheels are used for assistance before ejection; during the ejection preparation process, the mover of the linear motor and the superconducting coil for suspension are not energized, and the auxiliary wheels slide in the guide grooves to reach the designated position; The magnetic levitation structure includes: a track assembled in the direction of the magnetization of the Hellbach array according to the magnetic topology structure, and a superconducting coil suspended by electromagnetic repulsion with the track; the track is assembled into a plate-like body by track units; each track unit has a single magnetic field direction; adjacent track units are assembled in the order of increasing clockwise or counterclockwise angles of the magnetic field direction; The track unit is a prism with an equilateral triangular cross-section, and includes: a first track unit with a magnetic field direction parallel to the bottom edge, and a second track unit with a magnetic field direction perpendicular to the bottom edge.

2. The magnetically levitated, slotless, iron-core flat linear motor according to claim 1, characterized in that: The superconducting coils at both ends are arranged in pairs facing each other, and the magnetic field directions of the two superconducting coils facing each other are opposite.

3. The magnetically levitated, slotless, iron-core flat linear motor according to claim 1, characterized in that: The magnetic fields of two adjacent superconducting coils on the same end are in opposite directions.

4. The magnetically levitated, slotless, iron-core flat linear motor according to claim 1, characterized in that: The stator includes protrusions for embedding the two ends of the oriented silicon steel sheet; the two ends of the primary coil are assembled with the protrusions to form a straight slot arrangement along the driving force direction.

5. The magnetically levitated, slotless, iron-core flat linear motor according to claim 4, characterized in that: The raised portion includes a through hole for embedding the end portion of the oriented silicon steel sheet.

6. The magnetically levitated, slotless, iron-core flat linear motor according to claim 1, characterized in that: The spacing between adjacent primary coils is 20% to 30% of the width of the corresponding silicon steel sheet.

7. The magnetically levitated, slotless, iron-core flat linear motor according to claim 1, characterized in that: The air gap formed between the permanent magnet pole and the end face of the silicon steel sheet is 1 to 5 mm.

8. The magnetically levitated, slotless, iron-core flat linear motor according to claim 1, characterized in that: In the magnetic levitation structure, the levitation height of the superconducting coil suspended by the electromagnetic repulsive force is 8 to 20 mm.

9. The magnetically levitated, slotless, iron-core flat linear motor according to claim 1, characterized in that: The track unit includes a permanent magnet track unit and an electromagnet track unit.

10. The magnetically levitated, slotless, iron-core flat linear motor according to claim 9, characterized in that: The permanent magnet track unit is formed after being magnetized in different magnetization directions; and the electromagnetic track unit is formed according to a ridgeline winding path that complies with the right-hand screw rule.

11. The magnetically levitated, slotless, iron-core flat linear motor according to claim 1, characterized in that: The superconducting coil is made of a superconducting tape of yttrium series, lanthanum series, barium series or niobium series alloy.

12. The magnetically levitated, slotless, iron-core flat linear motor according to claim 11, characterized in that: The surface of the superconducting tape includes an insulating layer.

13. The magnetically levitated, slotless, iron-core planar linear motor according to claim 11, characterized in that: The winding standard of the superconducting tape includes: the material elongation caused by the winding curvature is ≤0.2%.

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