Flat type moving primary linear induction motor

Abstract

This invention discloses a flat-type moving primary linear induction motor, comprising a motor base, a motor stator assembly, a mover assembly, a power supply device, and a guiding device. The motor stator assembly is vertically fixed within the hollow frame of the motor base. Multiple vertically arranged guide rails are fixedly arranged on the left and right sides of the motor stator assembly. Multiple sliding contact line structures are arranged on the vertical inner wall of the motor stator assembly frame. The mover assembly includes a mover frame sleeved around the outer periphery of the motor stator assembly and a mover winding fixedly mounted in the middle of the mover frame. A sliding groove is provided on the mover frame. The guide rails are inserted into the sliding grooves, allowing the mover frame to move axially along the guide rail direction due to the constraint of the sliding grooves. Collectors are installed on the left and right sides of the mover frame, and the mover winding is powered by sliding contact through the collectors and the sliding contact line structures. This invention features high thrust density, compact structure, low cost, reliable operation, and convenient maintenance, and can be applied to high-thrust acceleration fields.

Description

Technical Field

[0001] This invention belongs to the field of linear motors, specifically relating to a flat-type moving primary linear induction motor, which is particularly suitable for applications requiring high thrust density and with strict constraints on size and weight. Background Technology

[0002] Electromagnetic launch technology represents a revolution in launch methods following mechanical and chemical energy launches. It is a launch technology that uses electromagnetic force to propel objects to high or ultra-high speeds. Electromagnetic launch requires rapidly accelerating a load to a specified speed over a limited distance; therefore, the launch actuator must possess characteristics such as large load capacity and high thrust density.

[0003] Currently, linear motors suitable for electromagnetic launch systems mainly include two types: linear induction motors and linear synchronous motors. Linear synchronous motors are further divided into permanent magnet and superconducting excitation types. Although permanent magnet synchronous linear motors and superconducting linear synchronous motors have higher power factors and efficiencies than linear induction motors, they each have their own drawbacks, particularly in reliability and environmental adaptability, which limits their application in electromagnetic launch scenarios. For example, permanent magnet synchronous linear motors are susceptible to demagnetization, have insufficient reliability, and the permanent magnets pose a risk of magnetic field interference to other combat equipment. Superconducting linear synchronous motors, on the other hand, have very stringent temperature requirements and require complex and bulky cooling equipment, resulting in limited prospects for practical engineering applications. In contrast, linear induction motors offer simple and easy-to-use control technology, reliable operation, convenient maintenance, and simple assembly, making them more suitable for high-acceleration applications. Summary of the Invention

[0004] To address the above problems, the present invention provides a flat-type moving primary linear induction motor, comprising a motor base with a hollow frame structure, a motor stator assembly, a moving part assembly, a power supply device, and a guiding device, wherein: The motor stator assembly is vertically fixedly installed inside the hollow frame of the motor base. Multiple vertically arranged guide rails are fixedly installed on the left and right sides of the motor stator assembly. Multiple sliding contact line structures are installed on the vertical inner wall of the motor stator assembly frame. The sliding contact line structures are connected to the external power supply. The mover assembly includes a mover frame fitted around the outer periphery of the motor stator assembly and a mover winding fixedly mounted in the middle of the mover frame. The mover frame is provided with a sliding groove; the guide rail is inserted into the sliding groove, and the mover winding and the mover frame are integrally cast from epoxy resin material. The moving frame can move axially along the guide rail direction by the constraint of the sliding groove; the current collector is installed on the left and right sides of the moving frame, and the moving winding completes the sliding contact power supply through the current collector and the sliding contact line structure; When in operation, the mover winding is energized, generating a traveling wave magnetic field in the air gap. At this time, eddy currents are induced on the two sets of motor stators. The interaction between the eddy currents and the air gap magnetic field generates electromagnetic thrust, and the mover winding, mover frame, and collector move in a straight line along the guide rail.

[0005] Furthermore, the motor stator assembly includes a front stator mechanism and a rear stator structure, and the mover winding is located in the gap between the stator mechanism and the rear stator structure, and can slide up and down in the gap with the mover frame.

[0006] Furthermore, the motor base includes an upper mounting plate, a lower mounting plate, and vertical support beams fixedly disposed on the left and right sides of the upper and lower mounting plates. In order to reduce the size and weight of the motor, high-strength aluminum alloy material is used, which has a compact structure, light weight, and high strength.

[0007] Furthermore, the sliding contact line structure includes a second insulating plate disposed on the vertical inner wall of the motor stator assembly frame and a power supply copper busbar fixedly disposed on the second insulating plate.

[0008] Furthermore, to ensure the reliability of the motor power supply, the power supply method of the mover winding adopts a sliding contact power supply form; the current collector includes a first insulating plate fixedly installed on both sides of the mover winding and multiple carbon brush brackets installed on the first insulating plate; an elastic structure is set between the carbon brush brackets and the first insulating plate, the elastic structure provides support and pushes the carbon brush brackets, and carbon brushes are set on the outer side of each carbon brush bracket, and the cables led out from the mover winding and the cables led out from the carbon brushes are fixedly connected to the carbon brush brackets.

[0009] Furthermore, the elastic structure is a spring installed inside the carbon brush holder. The spring pushes the carbon brush to ensure that the carbon brush is in close contact with the sliding contact line structure, forming a sliding contact power supply.

[0010] Furthermore, the mover winding includes Litz wire and an insulation layer. Each phase coil of the mover winding is formed by Litz wire with an insulation layer through a winding mold and then fixed to the mover frame. After winding, the whole unit is glued. The casting material fills the gaps between individual coils and between the coils and the mover frame so that the mover winding and the mover frame form a whole. The casting material is epoxy resin.

[0011] Furthermore, in order to reduce the length of the winding ends, thereby reducing motor losses and weight, the mover winding adopts an H-shaped structure, and the ends are formed using a winding mold.

[0012] Furthermore, the surface of the motor stator assembly is fixedly provided with a reinforcing structure, such as a truss structure; the guide rail is arranged vertically on the reinforcing structure.

[0013] Furthermore, the moving frame includes a hollowed-out cuboid frame composed of multiple horizontal and vertical profiles. Multiple vertically connected sliding grooves are provided on the front and rear sides of the hollowed-out frame, and guide rails are inserted into the sliding grooves.

[0014] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects: (1) The flat moving primary linear induction motor provided by the present invention adopts a flat moving primary structure. Two sets of double-sided stators work together on the same primary winding, which has a high thrust density, and the motor structure is compact with small size and weight.

[0015] (2) The flat-type moving primary linear induction motor provided by the present invention adopts an H-shaped winding structure. By adopting the H-shaped winding form, the winding is shaped as a whole by a winding mold. The effective straight section of the winding is free from interference from other structures, reducing the air gap with the double-sided stator and improving the motor efficiency.

[0016] (3) The flat-type moving primary linear induction motor provided by the present invention adopts a sliding contact power supply structure, which does not require dragging wires for power supply. The stator structure is only a solid aluminum plate, which has high reliability.

[0017] (4) The flat-type moving primary linear induction motor provided by the present invention adopts a segmented control strategy. During the start-up and steady-state phases, it achieves a gradient thrust output with a large thrust for rapid acceleration and a small thrust for steady acceleration in the later stage, thereby improving the motion positioning accuracy. By adjusting the current of the mover winding through closed-loop control, it ensures that the current adjustment response is fast and the thrust output error is small, thus ensuring a smooth transition of thrust. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of the present invention; Figure 2 for Figure 1 Cross-sectional structural diagram Figure 3 This is a schematic diagram of the motor base structure according to a preferred embodiment of the present invention; Figure 4 This is a schematic diagram of a preferred embodiment of the moving element sliding contact power supply structure of the present invention; Figure 5 This is a schematic diagram of the mover and current collector structure of a preferred embodiment of the present invention. Figure 6 This is a schematic diagram of the stator and mover motion guiding structure according to a preferred embodiment of the present invention; Figure 7 This is a schematic diagram of the winding cross-sectional structure of a preferred embodiment of the present invention; Figure 8 This is a schematic diagram (top view) of the winding structure of a preferred embodiment of the present invention. Figure 9 This is a schematic diagram (side view) of the winding structure of a preferred embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0020] Please refer to Figures 1-2 This invention relates to a flat-type moving primary linear induction motor, comprising a motor base, a motor stator, a mover winding, a mover frame, a current collector, a sliding contact line, a guide rail, and a sliding groove. The motor stator is an aluminum plate structure, divided into front and rear groups, both vertically fixed on the motor base. The mover winding and the mover frame are integrally cast from epoxy resin to ensure the overall strength and rigidity of the mover winding. The mover frame, constrained by the sliding groove, only moves axially along the guide rail direction. The current collector is mounted on the mover frame, and the sliding contact line is mounted on the motor base. The mover winding is powered via the current collector and the sliding contact line. During operation, the mover winding is energized, generating a traveling wave magnetic field in the air gap. This induces eddy currents in both sets of motor stators. The interaction between the eddy currents and the air gap magnetic field generates electromagnetic thrust, causing the mover winding, mover frame, and current collector to move linearly along the guide rail direction.

[0021] In some preferred embodiments, the motor stator assembly has a serpentine distribution of miniature cooling channels inside. The two ends of the miniature cooling channels pass through the upper and lower end faces of the stator assembly and extend to the outside of the motor base, and the ends are equipped with sealing joints. The sealing joints can be connected to an external cooling medium supply device, and by introducing air or coolant into the miniature cooling channels, the heat generated by the eddy currents in the stator aluminum plate is removed.

[0022] Please refer to Figure 3 The motor base consists of upper and lower mounting plates and left and right support beams forming a U-shaped frame structure, which is fixed in place by fasteners; the upper and lower mounting plates and left and right support beams are made of high-strength aluminum alloy, which is lightweight and high-strength.

[0023] Please refer to Figures 4-5The current collector and sliding contact line constitute the motor's power supply device. Two sets of power supply devices are respectively arranged at the left and right ends of the mover. The current collector includes carbon brushes, springs, carbon brush supports, and insulating plates. The sliding contact line consists of an insulating plate and power supply copper busbars. The cables led out from the mover windings and the cables 31 led out from the carbon brushes are fixedly connected to the carbon brush supports. The carbon brush supports are fixed to the insulating plates. The springs press the carbon brushes, ensuring close contact between the carbon brushes and the copper busbars on the sliding contact line. The copper busbars of each phase are respectively installed in the insulating plate grooves of the sliding contact line. The mover frame adopts a frame structure welded or assembled, and high-strength titanium alloy material is selected to ensure that the motor mover has sufficient strength and rigidity.

[0024] The power supply method for the mover winding adopts a sliding contact power supply form; the current collector includes a first insulating plate fixedly installed on both sides of the mover winding and multiple carbon brush supports installed on the first insulating plate; the carbon brush supports 53 can be designed as multiple rectangular structures arranged in a matrix, one side of each carbon brush support 53 is connected to the first insulating plate 54, and this connection can be a hinge or a connection with a certain degree of deflection and elasticity. The other side of the carbon brush support 53 is inserted into a rod-shaped structure 56 with a sliding groove 55. The rod-shaped structure 56 is fixedly connected to the first insulating plate 54 or the mover frame 4. The carbon brush support 53 is inserted into the sliding groove 55 of the rod-shaped structure and can slide up and down within a certain range along the sliding groove 55 of the rod-shaped structure, so that the carbon brush support 53 as a whole forms an elastic structure, ensuring that the carbon brush 51 is in close contact with the sliding contact line structure 6, while also having a certain amount of elastic adjustment space.

[0025] An elastic structure is installed between the carbon brush holder and the first insulating plate. This elastic structure supports and pushes the carbon brush holder. A carbon brush is installed on the outer side of each carbon brush holder. The cable leading from the mover winding and the cable leading from the carbon brush are fixedly connected to the carbon brush holder. The elastic structure is a spring installed on the inner side of the carbon brush holder. The spring pushes the carbon brush, ensuring that the carbon brush and the sliding contact line structure are in close contact, forming a sliding contact power supply.

[0026] Please refer to Figure 6 The guide rail and the slide groove form the guiding device of the motor. The guide rail is fixed on the outer end face of the motor stator. The slide groove 8 is made of polytetrafluoroethylene and is installed in the mover frame. In order to prevent the mover from making circumferential movement, the mover with the slide groove installed only makes axial movement under the constraint of the guide rail.

[0027] Please refer to Figure 5 , Figure 7 , Figure 8 The mover winding includes Litz wire and an insulation layer. Each phase coil of the mover winding is formed by winding Litz wire with an insulation layer through a winding mold and then fixed to the mover frame. After winding, the whole unit is potted with epoxy resin. The potting material fills the gaps between individual coils and between the coils and the mover frame, so that the mover winding and the mover frame form a whole.

[0028] In some other embodiments, the motor further includes a thrust gradient control module, which is connected to the mover winding, an external power supply, and a position and speed sensor signal. The position and speed sensor is mounted on the upper or lower mounting plate of the motor base and is used to collect the movement position of the mover assembly in real time. and speed Data; the thrust gradient control module pre-stores multiple sets of thrust position / velocity mapping curves, and dynamically adjusts the current phase, amplitude, or frequency of the input mover winding through the following control methods: The thrust target value calculation adopts segmented control: Start-up phase ( , (Preset switching speed threshold): ; in, The target thrust value for the start-up phase. This is the thrust adjustment coefficient during the startup phase. Accelerate to the target speed For the real-time velocity of the mover, To initiate thrust based on the foundation; Stable phase ( ): ; in, The target thrust value during the steady-state phase, For the steady-state thrust adjustment coefficient and , To preset a smooth speed, To minimize sustained thrust, this method achieves gradient thrust output by rapidly accelerating with high thrust during the initial phase and steadily increasing with low thrust in the later phase, thereby improving motion positioning accuracy.

[0029] The thrust gradient control module supports custom thrust parameter configuration and can input the target load weight via an external control terminal. ), acceleration time ( ), steady segment speed ( Based on the positioning accuracy requirements, the following thrust gradient control strategy is adopted: First, through the acceleration model: ; The target acceleration is obtained, where Accelerate towards the target To preset a smooth speed, To accelerate the process; combined with the load weight via electromagnetic thrust: ; The target current values ​​for each stage are derived in reverse, where Electromagnetic thrust, This is the motor structure coefficient (determined by motor size and magnetic circuit design). For the current in the mover winding, The air gap magnetic field strength, The effective length of the winding; the current regulation of the mover winding 3 adopts PID closed-loop control: ; in, The output current of the mover winding. This is the proportionality coefficient. The integral coefficient is... These are the differential coefficients. For the target current value, This is the actual value of the current. This is the integral term of the current deviation (the sum of deviations accumulated over a period of time). It represents the differential term of the current deviation (reflecting the rate of change of the deviation); it is suitable for non-launch scenarios such as precision delivery and adaptive loading, and meets the requirements for smooth thrust transition and positioning accuracy in different scenarios.

[0030] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flat type moving primary linear induction motor, characterized by: The components include a hollow frame structure motor base (1), a motor stator assembly (2), a mover assembly, a power supply device, and a guiding device, wherein: The motor stator assembly (2) is vertically fixed in the hollow frame of the motor base (1). Multiple vertically arranged guide rails (7) are fixed on the left and right sides of the motor stator assembly (2). Multiple sliding contact line structures (6) are set on the vertical inner wall of the frame of the motor stator assembly (2). The sliding contact line structure (6) is connected to the external power supply. The mover assembly includes a mover frame (4) sleeved on the outer periphery of the motor stator assembly and a mover winding (3) fixedly mounted in the middle of the mover frame (4). A groove (8) is provided on the mover frame (4); a guide rail (7) is inserted into the groove (8); the mover winding (3) and the mover frame (4) are integrally cast from epoxy resin material. The moving frame (4) can move axially along the direction of the guide rail (7) by the constraint of the slide groove (8); the collector (5) is installed on the left and right sides of the moving frame (4), and the moving winding (3) completes the sliding contact power supply through the collector (5) and the sliding contact line structure (6); When working, the mover winding (3) is energized, generating a traveling wave magnetic field in the air gap. At this time, eddy currents will be induced on the two sets of motor stators (2). The eddy currents and the air gap magnetic field interact to generate electromagnetic thrust. The mover winding (3), the mover frame (4), and the collector (5) move in a straight line along the guide rail direction.

2. The flat-type moving primary linear induction motor according to claim 1, characterized by: The motor stator assembly (2) includes a front stator mechanism (21) and a rear stator structure (22). Both the front stator mechanism (21) and the rear stator structure (22) are multi-layer solid aluminum plate structures. The mover winding (3) is located in the gap between the stator mechanism (21) and the rear stator structure (22) and can slide up and down in the gap with the mover frame (4).

3. The flat-type moving primary linear induction motor according to claim 1, characterized by: The motor base (1) includes an upper mounting plate (11), a lower mounting plate (12), and vertical support beams (13) that are fixedly installed on the left and right sides of the upper mounting plate (11) and the lower mounting plate (12).

4. The flat-type moving primary linear induction motor as described in claim 1, characterized in that: The sliding contact line structure (6) includes a second insulating plate (61) disposed on the vertical inner wall of the motor stator assembly (2) frame and a power supply copper busbar (62) fixedly disposed on the second insulating plate (61).

5. The flat-type moving primary linear induction motor as described in claim 1, characterized in that: The power supply method of the moving winding (3) is a sliding contact power supply form; the current collector (5) includes a first insulating plate (54) fixedly installed on both sides of the moving winding (3) and multiple carbon brush brackets (53) installed on the first insulating plate; an elastic structure is set between the carbon brush bracket (53) and the first insulating plate, the elastic structure supports and pushes the carbon brush bracket (53), and a carbon brush (51) is set on the outer side of each carbon brush bracket, and the cable (31) led out from the moving winding (3) and the cable led out from the carbon brush are fixedly connected to the carbon brush bracket (53).

6. The flat-type moving primary linear induction motor as described in claim 5, characterized in that: The elastic structure is a spring (52) installed inside the carbon brush holder (53). The spring (52) pushes the carbon brush (51) to ensure that the carbon brush (51) is in close contact with the sliding contact line structure (6) to form a sliding contact power supply.

7. The flat-type moving primary linear induction motor as described in claim 1, characterized in that: The mover winding (3) includes Litz wire and an insulation layer. Each phase coil of the mover winding (3) is formed by Litz wire with an insulation layer through a winding mold and then fixed on the mover frame (4). After the winding is completed, the whole is filled with glue. The casting material fills the gap between individual coils and between the coil and the mover frame (4) so ​​that the mover winding (3) and the mover frame (4) form a whole. The casting material is epoxy resin.

8. The flat-type moving primary linear induction motor as described in claim 1, characterized in that: The moving winding (3) adopts an H-shaped structure, and the ends are formed using a winding mold.

9. The flat-type moving primary linear induction motor as described in claim 1, characterized in that: The surface of the motor stator assembly (2) is fixedly provided with a reinforcing structure; the guide rail (7) is arranged vertically on the reinforcing structure (23).

10. The flat-type moving primary linear induction motor according to any one of claims 1 to 9, characterized by: The moving frame (4) includes a hollowed-out cuboid frame composed of multiple horizontal profiles (41) and vertical profiles (42). Multiple vertically connected sliding grooves (8) are provided on the front and rear sides of the hollowed-out frame, and guide rails (7) are inserted into the sliding grooves.

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