Moving magnet electromagnetic catapult short circuit braking system

Abstract

The utility model relates to electromechanical control technical field, concretely relates to a dynamic magnetic type electromagnetic catapult short circuit braking system, is equipped with catapult track, and the catapult track is equipped with acceleration section and deceleration section, and includes mover, multiple stator coils and multiple power supply driving devices, multiple stator coils are arranged in sequence along the catapult track, the mover moves along the catapult track, multiple power supply driving devices are connected to corresponding stator coils at intervals, and the three-phase short circuit of each stator coil of deceleration section. The utility model discloses short circuit braking directly utilizes short circuit motor three-phase winding to realize braking, need not to install magnetic brake or other braking device extra, and the system integration degree is high, is suitable for the electromagnetic catapult system of limited space, solves the technical problem that the mechanical braking and magnetic brake braking mode in prior art exist response lag and friction loss under high speed, high energy working condition.

Description

Technical Field

[0001] This utility model relates to the field of electromechanical control technology, specifically to a moving-magnetic electromagnetic catapult short-circuit braking system. Background Technology

[0002] Traditional magnetic braking systems for electromagnetic catapults add magnetic braking devices to both sides of the catapult track, generating braking force through hysteresis loss and magnetic reluctance. This traditional magnetic braking method requires an additional braking structure, increasing system complexity; the braking force is strongly correlated with speed, resulting in poor performance at low speeds; and it suffers from hysteresis and response delay. Improvements to traditional mechanical and magnetic braking methods include: dividing the braking magnets into multiple independently controlled segments, activating all magnets at high speeds and gradually deactivating some at low speeds, but this still suffers from response lag under high-speed, high-energy conditions; using a magnetic braking structure in conjunction with braking, but this results in significant frictional losses; embedding a microchannel liquid cooling system inside the permanent magnet, or using phase change materials (such as heat pipes) for passive heat dissipation, but these methods suffer from high maintenance costs and are insufficient to meet the braking requirements of next-generation electromagnetic catapult systems.

[0003] In summary, there is an urgent need for a braking system that requires no additional braking device, has a faster response speed, is more suitable for high-speed and high-power scenarios, and has no contact wear, in order to solve the problems existing in the current technology. Utility Model Content

[0004] The purpose of this utility model is to provide a moving-magnetic electromagnetic catapult short-circuit braking system to solve the technical problems of response lag and severe friction loss in existing mechanical braking and magnetic braking methods under high-speed and high-energy conditions. The specific technical solution is as follows:

[0005] This utility model provides a moving magnet type electromagnetic catapult short-circuit braking system, which is provided with a catapult track. The catapult track has an acceleration section and a deceleration section. The moving magnet type electromagnetic catapult short-circuit braking system includes a mover, multiple stator coils and multiple power supply drive devices. The multiple stator coils are arranged sequentially along the catapult track. The mover moves along the catapult track. The multiple power supply drive devices are connected at intervals to the corresponding stator coils. The three phases of each stator coil in the deceleration section are short-circuited.

[0006] A further improvement of this utility model's moving-magnetic electromagnetic catapult short-circuit braking system is that it also includes a contactor for short-circuiting the three phases of the stator coil.

[0007] A further improvement of this invention's moving-magnetic catapult short-circuit braking system is that it also includes an insulated gate bipolar transistor for short-circuiting the three phases of the stator coil.

[0008] A further improvement of this utility model's moving-magnetic electromagnetic catapult short-circuit braking system is that the mover is a permanent magnet.

[0009] The application of the technical solution of this utility model has the following beneficial effects:

[0010] This utility model relates to a moving-magnetic electromagnetic catapult short-circuit braking system. By short-circuiting the three phases of the coil of the linear motor in the deceleration section, when the mover moves at high speed to the deceleration section, the mover's magnetic field cuts the stator winding. Since the mover is still moving at high speed, its magnetic field will induce a current in the short-circuited winding. The induced current will generate a magnetic field that opposes the secondary motion, forming a reverse braking force, which decelerates the mover / catapult carrier, thereby achieving the purpose of moving-magnetic braking.

[0011] This invention's short-circuit braking directly utilizes the three-phase windings of a short-circuit motor to achieve braking, eliminating the need for additional magnetic brakes or other braking devices. It boasts high system integration, making it suitable for space-constrained electromagnetic catapult systems. This avoids the problems of traditional magnetic brakes, which require independent permanent magnets and conductor plates, increasing weight and complexity. Furthermore, this invention's short-circuit braking, achieved through power electronic devices (such as contactors or insulated-gate bipolar transistors), can switch in an extremely short time, making it suitable for high-speed dynamic braking. This avoids the potential reduction in braking force caused by eddy current saturation at extremely high speeds with magnetic brakes. Since this invention's short-circuit braking involves only electrical components, its reliability is higher. It also avoids the long-term wear and tear that can occur with permanent magnets or conductor plates in magnetic brakes due to vibration / friction. Thus, it solves the technical problems of response lag and severe frictional loss in existing mechanical and magnetic braking methods under high-speed, high-energy conditions.

[0012] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0013] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0014] Figure 1 This is a schematic diagram of the moving magnet type electromagnetic catapult short-circuit braking system of this utility model;

[0015] Figure 2 This is a schematic diagram of the short circuit between the three phases of the stator coil of the moving magnet type electromagnetic catapult short-circuit braking system of this utility model.

[0016] Among them, 1. stator coil; 2. position detection device; 3. mover; 4. power supply and drive device. Detailed Implementation

[0017] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0018] Electromagnetic catapults are a technology that converts electrical energy into kinetic energy using the Lorentz force, and generally fall into two categories:

[0019] Coil-based acceleration: This method involves sequentially energizing multiple coils, utilizing the alternating magnetic field generated by the pulsed electromagnetic coils to interact with the projectile (such as a permanent magnet). By controlling the timing of the energizing and de-energizing of multiple coils, a moving magnetic field is created, gradually accelerating the projectile.

[0020] Orbital acceleration type: A super-strong current is passed through parallel guide rails, and the projectile is part of a closed loop. The current creates a vertical magnetic field between the guide rails, and the projectile is accelerated by the Lorentz force.

[0021] The electromagnetic catapult of this invention is a coil-acceleration type. Its principle is as follows: multiple coils are energized sequentially, and the alternating magnetic field generated by the pulsed electromagnetic coils interacts with the catapult (such as a permanent magnet). By controlling the energization and de-energization of multiple coils in a timing sequence, a moving magnetic field is formed, which gradually accelerates the catapult.

[0022] See Figures 1-2 As shown, a moving-magnetic electromagnetic catapult short-circuit braking system includes a catapult track with an acceleration section and a deceleration section. The system comprises a mover 3, multiple stator coils 1, and multiple power supply drive devices 4. The stator coils 1 are arranged sequentially along the catapult track, and the mover 3 moves along the track. The power supply drive devices 4 are spaced apart and connected to corresponding stator coils 1. In the deceleration section, the three phases of each stator coil 1 are short-circuited. A position detection device 2 for detecting the position of the mover 3 is provided on the catapult track.

[0023] This utility model can calculate the track lengths of the acceleration and deceleration sections according to project requirements, such as... Figure 1 As shown, along the launch direction, the first half is the acceleration section and the second half is the deceleration section. The specific acceleration / deceleration ratio is calculated according to project requirements, generally the acceleration section ratio is greater than 70% to 80%. The power supply drive device 4 includes a power supply device and a drive device. The power supply device is an energy storage power supply; the drive device is a frequency converter drive (e.g., a frequency converter). The stator winding short-circuit braking of the moving magnet linear motor of this utility model utilizes the electromagnetic induction effect of the linear motor (stator coil) itself. During the braking stage, the three phases of each stator coil are short-circuited, causing the high-speed moving permanent magnet 3 to cut the magnetic field, inducing a reverse current in the stator coil, thereby generating an electromagnetic braking torque to achieve non-contact, high-efficiency braking.

[0024] In Example 1, the moving magnet type electromagnetic catapult short-circuit braking system also includes a contactor for short-circuiting the three phases of the stator coil 1.

[0025] Example 2: The moving magnet type electromagnetic catapult short-circuit braking system also includes an insulated-gate bipolar transistor (IGBT) for short-circuiting the three phases of the stator coil 1.

[0026] Preferably, the mover 3 is a permanent magnet (launch carrier). The permanent magnet moves along the guide rail under the action of electromagnetic force. The stator coil 1 is provided by the stator, which is a linear motor. The linear motor includes a stator coil and an iron core. The iron core has iron core slots, and the stator coil is embedded in the iron core slots. When energized, it generates a traveling wave magnetic field.

[0027] Furthermore, the permanent magnet is made of neodymium iron boron. Other high-coercivity rare-earth permanent magnets can also be used to enhance the magnetic field strength and reduce the risk of demagnetization. Its smaller size makes it suitable for space-constrained applications.

[0028] The use case data for this embodiment is as follows:

[0029] ① When a system uses resistive energy consumption braking, all the energy is converted into heat during braking, leading to excessive temperature rise and affecting continuous launch efficiency. When using the short-circuit braking method of this invention, braking is achieved by inducing a reverse current in the stator coil during the movement of the launch carrier (moving element). This increases braking speed by four times, meeting the requirements of high-frequency launch; and the energy is fed back to the flywheel energy storage system, reducing overall energy consumption by 15%~20%.

[0030] ② The original electromagnetic railgun test platform used a combination of mechanical and resistive braking, which resulted in severe wear on the friction plates during braking and made it impossible to recover energy. After improvement with this invention, short-circuit braking is employed, utilizing the induced current in the coil to achieve rapid braking. The braking distance is reduced by 80%, improving the safety of the test site; furthermore, the recovered energy is used to charge the capacitor bank, reducing the need for external power supply.

[0031] This utility model relates to a moving-magnetic electromagnetic catapult short-circuit braking system. By short-circuiting the three phases of the linear motor coil in the deceleration section, when the mover 3 moves at high speed to the deceleration section, the magnetic field of the mover 3 cuts the stator winding. Since the mover 3 is still moving at high speed, its magnetic field will induce a current in the short-circuited winding. According to Lenz's law, the induced current will generate a magnetic field that opposes the secondary motion, forming a reverse braking force, which decelerates the mover 3 / catapult carrier, thereby achieving the braking purpose of the mover 3.

[0032] This invention's short-circuit braking directly utilizes the three-phase windings of a short-circuit motor to achieve braking, eliminating the need for additional magnetic brakes or other braking devices. It boasts high system integration, making it suitable for space-constrained electromagnetic catapult systems. This avoids the problems of traditional magnetic brakes, which require independent permanent magnets and conductor plates, increasing weight and complexity. Furthermore, this invention's short-circuit braking, achieved through power electronic devices (such as contactors or insulated-gate bipolar transistors), can switch in an extremely short time, making it suitable for high-speed dynamic braking. This avoids the potential reduction in braking force caused by eddy current saturation at extremely high speeds with magnetic brakes. Since this invention's short-circuit braking involves only electrical components, its reliability is higher. It also avoids the long-term wear and tear that can occur with permanent magnets or conductor plates in magnetic brakes due to vibration / friction. Thus, it solves the technical problems of response lag and severe frictional loss in existing mechanical and magnetic braking methods under high-speed, high-energy conditions.

[0033] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A moving-magnetic electromagnetic catapult short-circuit braking system, comprising a catapult track, wherein the catapult track has an acceleration section and a deceleration section, characterized in that, The moving magnet type electromagnetic catapult short-circuit braking system includes a mover (3), multiple stator coils (1) and multiple power supply drive devices (4); the multiple stator coils (1) are arranged sequentially along the catapult track, the mover (3) moves along the catapult track, the multiple power supply drive devices (4) are connected at intervals to the corresponding stator coils (1), and the three phases of each stator coil (1) in the deceleration section are short-circuited.

2. The moving-magnetic electromagnetic catapult short-circuit braking system according to claim 1, characterized in that, It also includes a contactor for short-circuiting the three phases of the stator coil (1).

3. The moving-magnetic electromagnetic catapult short-circuit braking system according to claim 1, characterized in that, It also includes an insulated gate bipolar transistor for shorting between the three phases of the stator coil (1).

4. The moving-magnetic electromagnetic catapult short-circuit braking system according to claim 1, characterized in that, The mover (3) is a permanent magnet.

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