CN106300876B - A kind of Electromagnetic Control screw rod accelerator - Google Patents

Abstract

The invention discloses an electromagnetically controlled screw acceleration device, comprising: a magnetic field generating device for generating an alternating magnetic field, including a silicon steel sheet iron core and a winding wound inside the silicon steel sheet iron core; a screw arranged along the axis at The magnetic field generating device is used to convert the rotational speed of the accelerated body into an axial linear motion speed; the accelerated body cooperates with the screw through an internal thread, and its outer peripheral wall is symmetrically provided with two opposite magnetic stages. The NdFeB permanent magnet; the input power supply device, including a high-power inverter and a power consumption meter connected in turn between the unidirectional AC power supply and the magnetic field generator through the circuit, are used to adjust the input AC frequency to realize the rotation speed of the magnetic field adjust. The invention has a simple structure, realizes the acceleration of the accelerated body by utilizing the alternation of the magnetic field and the application of the screw rod, and is expected to become a novel electromagnetic orbital acceleration device.

Description

An electromagnetic control screw acceleration device

technical field

The invention relates to a screw acceleration device based on electromagnetic control, and is especially suitable for the electromagnetic acceleration device.

Background technique

The phenomenon that a current-carrying conductor is stressed in a magnetic field is one of the important phenomena in electromagnetism. Through the interaction between electricity and magnetism, the phenomenon of mechanical force is generated, and electromagnetic energy is converted into kinetic energy. In the field of accelerated launch, most of the launch devices that belong to chemical launch can no longer meet the requirements of ultra-high kinetic energy for launch capability. In this case, a new generation of ultra-high-speed electromagnetic launch acceleration technology has been produced, and electromagnetic energy has been used as the power source of the propulsion system. The so-called electromagnetic accelerated emission is to place a magnetic object on a specific screw, and use an external magnetic field to act on its force and torque, quickly change the direction of the magnetic field through the change of the high-frequency magnetic field, and use the magnetic field rotation form to attract And drive the object to rotate, the slope nature of the mounted screw converts the axial high-speed rotation into the axial linear acceleration motion.

Contents of the invention

The new acceleration method used in this paper mainly relies on Faraday's law of electromagnetic induction. The overall principle of the drive is to use the force and torque of the external magnetic field on the magnetic object to act on the accelerated object in the form of magnetic torque. body. Relying on the cooperation of the helical device of the accelerated body and the screw, the kinetic energy of the rotation is converted into the axial linear kinetic energy to complete the acceleration.

The technical scheme adopted in the present invention is:

An electromagnetic control screw acceleration device, comprising:

The magnetic field generating device is used to generate an alternating magnetic field, which includes a silicon steel sheet iron core and a winding wound inside the silicon steel sheet iron core;

a screw, arranged in the magnetic field generating device along the axis, for converting the rotational speed of the accelerated body into an axial linear motion speed;

The accelerated body cooperates with the screw through internal threads, and its outer peripheral wall is symmetrically provided with two NdFeB permanent magnets with opposite magnetic poles;

The input power supply device includes a high-power inverter and a power consumption meter that are sequentially connected between the single-phase AC power supply and the magnetic field generator through a circuit, and is used to adjust the rotation speed of the magnetic field by adjusting the frequency of the input AC power.

Further, the silicon steel sheet iron core is arranged in a cylindrical shape in the magnetic field generating device, and is formed by stacking and pressing silicon steel sheets with a thickness of 0.5 mm and insulating varnish between the sheets. The inner surface of the silicon steel sheet iron core is along the Straight slots are evenly distributed in the axial direction, and the same windings are arranged one by one at the same center to form a zigzag form and wind in the straight slots.

Further, the silicon steel sheet iron core is provided with gaps between adjacent windings to form ventilation grooves for heat dissipation.

Further, the winding includes a main winding and a starting winding connected in parallel, and a phase-splitting capacitor is connected in series to the starting winding, so that the phase difference between the current of the starting winding and the main winding is approximately 90 degrees, and the main winding and The starting windings differ by 90 degrees in the spatial position of the assembly, and generate a rotating magnetic field in space to drive the rotation of the accelerated body.

Further, the power consumption meter adopts WL258 power consumption meter.

Further, the material of the screw is 7075 aluminum alloy.

Further, the material of the accelerated body is PTFE wear-resistant plastic.

Further, the internal thread of the accelerated body is equal to the pitch of the external thread of the screw, the lead angle of the thread is equal, and the direction of rotation is the same.

Compared with the prior art, the present invention mainly relies on Faraday's law of electromagnetic induction, uses the force and torque of the external magnetic field on the magnetic object, acts on the accelerated body in the form of magnetic torque, and relies on the accelerated body The combination of the advanced screw device and the screw converts the kinetic energy of the rotation into the axial linear kinetic energy to complete the acceleration, and has many advantages such as flexible and convenient control, simple structure and easy implementation, stability and durability.

Description of drawings

Fig. 1 is a schematic cross-sectional top view of the main body of the acceleration device.

Figure 2 is a partial schematic diagram of the front section of the magnetic field generator

Figure 3 is a phase-splitting circuit diagram of the magnetic field generator.

Fig. 4 is a sectional view of the emitting accelerated body.

Figure 5 is a diagram of the input power supply device.

In the figure: 1-magnetic field generator, 2-NdFeB permanent magnet, 3-accelerated body, 4-screw, 5-silicon steel sheet core, 51-ventilation ditch, 6-winding, 7-main winding, 8- Start winding, 9-phase split capacitor, 10-high power inverter, 11-internal thread, 12-power consumption meter.

Detailed ways

The purpose of the present invention will be further described in detail through specific examples below, and the examples cannot be repeated here one by one, but the implementation of the present invention is not therefore limited to the following examples.

Example

As shown in Figures 1 to 5, an electromagnetic control screw acceleration device includes:

The magnetic field generating device 1 is used to generate an alternating magnetic field, and includes a silicon steel sheet iron core 5 and a winding 6 wound inside the silicon steel sheet iron core 5;

The screw 4 is arranged in the magnetic field generator 1 along the axis, and is used to convert the rotational speed of the accelerated body 3 into an axial linear motion speed;

The accelerated body 3 cooperates with the screw 4 through an internal thread, and its outer peripheral wall is symmetrically provided with two NdFeB permanent magnets 2 with opposite magnetic poles;

The input power supply device includes a high-power inverter 10 and a power consumption meter 12 sequentially connected between the single-phase AC power supply and the magnetic field generator 1 through a circuit, and is used to adjust the rotation speed of the magnetic field by adjusting the frequency of the input AC power.

Specifically, as shown in FIG. 2 , the silicon steel sheet iron core 5 of the magnetic field generating device 1 is in the shape of a cylinder and is loaded into the magnetic field generating device 1 , which is a part of the main flux magnetic circuit of the motor. In order to reduce the loss of the silicon steel sheet iron core 5, it is formed by stacking and pressing silicon steel sheets with a thickness of 0.5mm and insulating varnish between the sheets. The inner surface of the circumference of the silicon steel sheet iron core 5 has straight grooves evenly distributed along the axial direction.

Specifically, as shown in Figure 3, the winding 6 is divided into a main winding 7 and a starting winding 8. Since the input single-phase alternating current cannot generate a rotating magnetic field, a starting winding 8 is added in parallel to the device, and the starting winding 8 needs to be A suitable phase-splitting capacitor 9 is connected in series so that the phase difference with the current of the main winding 7 is approximately 90 degrees. In this way, two currents with a difference of 90 degrees in time are passed into two windings 6 with a difference of 90 degrees in space, and a (two-phase) rotating magnetic field will be generated in space. Under the action of this rotating magnetic field, the accelerated body 3 will be driven rotation. It should be noted that several rectangular coils of the same coil group are embedded one by one according to the same central position and arranged in a zigzag pattern. In order to increase the heat dissipation area, the silicon steel sheet iron core 5 is provided with gaps between adjacent windings 6 to form ventilation grooves 51 for heat dissipation.

As shown in FIG. 4 , two NdFeB permanent magnets 2 with opposite magnetic poles are placed symmetrically on both sides of the accelerated body 3 to complete its force bearing function. As a rare earth permanent magnet material, NdFeB has the advantages of extremely high magnetic energy product, coercive force and high energy density. In the magnetic field generating device 1 , the induced magnetic field is stressed, and the accelerated body 3 is driven to rotate by embedding the two poles of the accelerated body 3 . It should be noted that when the two NdFeB permanent magnets 2 are placed, the two magnets must ensure that the opposite magnetic poles ensure that the magnetism is opposite, so as to ensure that the overall magnetic flux lines pass through completely. The internal thread 11 cooperates with the screw rod 4 and plays an important role in converting the axial rotation into the axial linear motion. The internal thread 11 needs to keep the pitch equal to the thread pitch of the external screw, the lead angle Ψ of the thread is equal, and the direction of rotation is the same. The accelerated body 3 is mostly made of PTFE wear-resistant plastic, the wear-resistant plastic plate has high impact strength, and the friction coefficient is between 0.07-0.11, which is close to zero friction. It is resistant to chemical corrosion and can be resistant to corrosion by acids, alkalis, salts and other media.

The screw 4 is mainly responsible for converting axial rotation into axial linear motion. The screw 4 is made of 7075 aluminum alloy, which has low density but relatively high strength, and is suitable for the working environment of high-speed operation, high strength and anti-magnetic properties in this operating environment. Its wear resistance and corrosion resistance are enhanced by certain hard anodizing or the incorporation of surface sprayed titanium alloy materials.

The power consumption meter 12 is a WL258 power consumption meter.

As shown in Figure 5, in order to adjust the rotation speed of the magnetic field, the most direct way is to directly change the input AC frequency for speed regulation. The frequency conversion device for alternating current can be completed by using a high-power alternating current inverter. The high-power inverter 10 first converts the alternating current into direct current, and then switches the direct current with electronic components. The frequency can be adjusted within a certain range and become alternating current. The periodic change of the magnetic field generated by the magnetic field generating device 1 directly affects the rotational speed of the magnetic field, so that the rotational speed of the object 3 to be accelerated can be adjusted within a certain range. The main setting parameters are related to the ascending angle of the screw 4 and the effective acceleration distance. Through the direct monitoring of the power consumption meter 12, the power consumption parameters of the overall device can be intuitively obtained, and effective and safe adjustments can be made within a corresponding range.

This embodiment provides a non-magnetic accelerated body 3 of a two-pole device NdFeB permanent magnet 2 and a screw 4 that rotates and rises at a certain helix angle as basic accessories, and at the same time, the AC input processed by a high-power inverter 10 is applied externally. The alternating rotating magnetic field generator 1 generates a rotating magnetic field. When the external driving magnetic field rotates and begins to generate a phase difference, the relative rotation angle a between the accelerated body 3 and the external driving magnetic field changes. The rotation speed of the magnetic field generated by the magnetic field generator 1 gradually increases, and the magnetic driving force is generated under the mutual attraction of the same-sex magnetic poles of the NdFeB permanent magnet 2. When the driving torque is greater than the static friction generated by the accelerated body 3 in the working environment When the resistance torque is reached, the accelerated body 3 starts to rotate. The accelerated body 3 has an internal thread 11 inside, and the internal thread 11 of the accelerated body 3 cooperates with the screw 4, so that the accelerated body 3 rotates in a mirror image along the orbit and at the same time converts a part of the axial rotation into a straight line along the axial direction Speed, to achieve the purpose of accelerating launch. By adjusting the rotation speed and direction of the magnetic field, the speed control and positioning of the accelerated body 3 are adjusted.

The above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (7)

1. An electromagnetic control screw acceleration device is characterized in that, comprising: A magnetic field generating device (1), used to generate an alternating magnetic field, which includes a silicon steel sheet core (5) and a winding (6) wound inside the silicon steel sheet iron core (5); a screw (4), arranged in the magnetic field generator (1) along the axis, for converting the rotational speed of the accelerated body (3) into an axial linear motion speed; The accelerated body (3) cooperates with the screw (4) through the internal thread (11), and its outer peripheral wall is symmetrically provided with two NdFeB permanent magnets (2) with opposite magnetic poles; The input power supply device includes a high-power inverter (10) and a power consumption meter (12) sequentially connected between the single-phase AC power supply and the magnetic field generator (1) through a circuit, and is used to realize the magnetic field by adjusting the frequency of the input AC power Rotation speed adjustment; The winding (6) includes the main winding (7) and the starting winding (8) connected in parallel, and the starting winding (8) is connected in series with a split-phase capacitor (9), so that it is connected with the main winding (7) The phases of the currents are approximately 90 degrees different, and the main winding (7) and the starting winding (8) are assembled with a 90-degree difference in spatial position, generating a rotating magnetic field in space to drive the rotation of the accelerated body (3). 2. The electromagnetic control screw acceleration device according to claim 1, characterized in that: the silicon steel sheet iron core (5) is arranged in the magnetic field generating device (1) in a cylindrical shape, with a thickness of 0.5 mm and a gap between the sheets. It is formed by stacking and pressing silicon steel sheets insulated with insulating varnish. The inner surface of the silicon steel sheet iron core (5) is evenly distributed with straight grooves along the axial direction. The form is wound in a straight groove. 3. The electromagnetic control screw acceleration device according to claim 2, characterized in that: the silicon steel sheet iron core (5) is provided with a gap between adjacent windings (6) to form a ventilation ditch (51 for heat dissipation) ). 4. The electromagnetically controlled screw acceleration device according to claim 1, characterized in that: the power consumption meter (12) is a WL258 power consumption meter. 5. The electromagnetic control screw acceleration device according to claim 1, characterized in that: the material of the screw (4) is 7075 aluminum alloy. 6. The electromagnetic control screw acceleration device according to claim 1, characterized in that: the material of the accelerated body (3) is PTFE wear-resistant plastic. 7. The electromagnetically controlled screw acceleration device according to claim 1, characterized in that: the internal thread (11) of the accelerated body (3) is equal to the pitch of the external thread of the screw (4), the lead angle of the thread is equal, and the screw To the same.