Motor module of electromagnetic Hopkinson torsion bar tester

Abstract

The utility model discloses a motor module of an electromagnetic Hopkinson torsion bar test device, comprising a shell, a right outer yoke is fixedly arranged on the inner side of the shell, a rotor with two ends rotatably supported on the shell, and an inner yoke fixed to the shell and arranged inside the rotor, and a rotating shaft is arranged on the end face of the rotor; a first permanent magnet, which is fixedly arranged on the outer side of the inner yoke; a second permanent magnet, which is fixedly arranged on the inner side of the outer yoke, and the second permanent magnet corresponds to the first permanent magnet in position and has opposite magnetic pole faces; and a coil structure, which is embedded in the rotor. The utility model improves the electromagnetic induction motor from a single magnet structure to a double-layer magnet structure, thereby improving the strength of the overall magnetic field and being able to generate a torque with higher strength.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a motor module of an electromagnetic Hopkinson torsion bar test device. Background Art

[0002] With the development of science and technology, the Hopkinson torsion bar technology at home and abroad is constantly improving. Most of the improvements to the Hopkinson torsion bar technology are concentrated on the loading method and fixture. Different design methods have different rising edge time and strain rate ranges. The rising edge time of the explosive loading method is 5 to 10 μs, which is an ideal rising time, but it also has obvious disadvantages. Explosives are flammable and explosive items. They are relatively dangerous during storage and use, and the torsion wave is difficult to control. When a hydraulic system is used as a loading device, a larger torsional force can be obtained. However, a large hydraulic supply system needs to be provided. The hydraulic system reacts slowly, is difficult to accurately control, occupies a large space, has a high cost, and is difficult to maintain. Nie and Clause designed a direct impact loading method, which improved the controllability of the torsion wave and saved experimental time. However, this loading method would inevitably produce bending waves. The larger the required torsion wave, the greater the bending wave interference. Therefore, it would be more difficult to eliminate the bending wave. It was difficult to ensure pure shear of the specimen. At the same time, the bending wave would seriously interfere with the recording of the waveform, resulting in signal analysis errors. Therefore, with the improvement of the technicians, electromagnetic force loading was adopted. By controlling the transient discharge of the large-capacity capacitor, the ultra-high-speed DC motor installed on the torsion bar reinforcement part could be rotated instantly.

[0003] However, there are still some problems with the above structure. The electromagnetic induction motors currently used are mostly designed with a single-layer magnet structure. The overall magnetic field strength is relatively low, and the torque applied to the test piece is small, which affects the operation of the overall finished product. At the same time, the existing coil design cannot achieve the actual required magnetic field effect, which will result in a large circuit inductance, which is not conducive to shortening the power supply discharge time, and will cause the rising edge time of the torque wave to slow down, thereby failing to meet the requirements of the loading strain rate of the test piece.

[0004] Based on the above reasons, it is necessary to improve the existing technology. Utility Model Content

[0005] 1. Technical issues to be solved

[0006] The utility model aims at the above defects existing in the prior art, and specially proposes a motor module of an electromagnetic Hopkinson torsion bar test device to solve the problems raised in the above background technology.

[0007] 2. Technical Solution

[0008] In order to solve the above technical problems, the utility model provides a motor module of an electromagnetic Hopkinson torsion bar test device, comprising a housing, a right outer yoke is fixedly arranged inside the housing, a rotor rotatably supported at both ends on the housing, and an inner yoke fixed to the housing and arranged inside the rotor, and a rotating shaft is arranged on the end surface of the rotor;

[0009] A first permanent magnet, which is fixedly disposed outside the inner magnetic yoke;

[0010] A second permanent magnet, which is fixedly disposed on the inner side of the outer magnetic yoke, and has a corresponding position to the first permanent magnet and opposite magnetic pole faces;

[0011] A coil structure is embedded in the rotor.

[0012] In the above technical solution, the rotor surface is provided with a first harness groove, a second harness groove, and a semicircular harness groove connecting the first harness groove and the second harness groove at the upper and lower ends, and the semicircular harness grooves at the upper and lower ends are in opposite directions;

[0013] A wire passes through the first harness groove, the semicircular harness groove at one end, the second harness groove, and the semicircular harness groove at the other end in sequence, and then circulates through the above path until all the single harness grooves in the harness groove are filled to form a coil structure, and the coil structure also includes two protruding positive and negative pins.

[0014] In the above technical solution, the gap between the first permanent magnet and the second permanent magnet corresponding to its position is greater than or equal to 8 mm.

[0015] In the above technical solution, a through hole for the pin to pass through is provided on one side of the shell.

[0016] In the above technical solution, the shell includes an upper shell and a lower shell fixedly connected to the upper shell, the four corners of the bottom end of the upper shell are concave with limiting grooves, and the lower shell is convexly provided with a first limiting protrusion used in conjunction with the limiting grooves.

[0017] In the above technical solution, both ends of the rotor are fixedly connected to the housing and the inner magnetic yoke via a first bearing and a second bearing respectively, and one end of the rotating shaft is fixedly connected to the inner magnetic yoke via a third bearing.

[0018] In the above technical solution, a plurality of limiting ribs are convexly provided in the inner cavity of the shell, and a limiting recess for use with the limiting ribs is concavely provided on the outer magnetic yoke.

[0019] 3. Beneficial Effects

[0020] Compared with the prior art, the utility model has the following beneficial effects: the utility model improves the electromagnetic induction motor from a single magnet structure to a double-layer magnet structure, thereby increasing the strength of the overall magnetic field, thereby being able to generate a higher torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0022] Figure 2 It is a front view structural schematic diagram of the utility model.

[0023] Figure 3 It is a reverse structural schematic diagram of the utility model.

[0024] Figure 4 It is a schematic diagram of the explosion structure of the utility model.

[0025] Figure 5 It is a partial structural schematic diagram of the utility model.

[0026] Figure 6 It is a schematic diagram of the rotor of the utility model from the left.

[0027] Figure 7 It is a schematic diagram of the rotor from the right side of the utility model.

[0028] Figure 8 This is a schematic diagram of the shell structure of the utility model.

[0029] Fig. 9 It is a schematic diagram of the cross-sectional structure of the utility model.

[0030] In the figure: 1 is a shell, 10 is an outer yoke, 11 is an inner yoke, 12 is a through hole, 13 is an upper shell, 14 is a lower shell, 15 is a limiting rib, 16 is a limiting recess, 100 is a rotor, 101 is a rotating shaft, 102 is a first bearing, 103 is a second bearing, 104 is a third bearing, 130 is a limiting groove, 140 is a first limiting protrusion, 1000 is a first wiring harness groove, 1001 is a second wiring harness groove, 1002 is a semicircular wiring harness groove, 2 is a first permanent magnet, 3 is a second permanent magnet, 4 is a coil structure, and 40 is a pin. DETAILED DESCRIPTION

[0031] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0032] See also Figure 1-9The utility model provides a motor module of an electromagnetic Hopkinson torsion bar test device, comprising a housing 1, a right outer yoke 10 fixedly arranged inside the housing 1, a rotor 100 rotatably supported at both ends on the housing 1, and an inner yoke 11 fixed to the housing 1 and arranged inside the rotor 100, and a rotating shaft 101 is arranged on the end surface of the rotor 100;

[0033] A first permanent magnet 2, wherein the first permanent magnet 2 is fixedly disposed outside the inner magnetic yoke 11;

[0034] A second permanent magnet 3, which is fixedly disposed on the inner side of the outer yoke 10, and has a corresponding position to the first permanent magnet 2 and opposite magnetic pole faces;

[0035] The coil structure 4 is embedded in the rotor 100 .

[0036] In the above structure, an inner yoke and an outer yoke for transmitting magnetic lines of force are arranged inside the shell, a plurality of first permanent magnets symmetrically arranged in the upper and lower parts are attached to the inner yoke, and a second permanent magnet having the same number as the first permanent magnet and a length greater than the first permanent magnet is attached to the outer yoke. The N pole face of the first permanent magnet on one side corresponds to the S pole face of the corresponding second permanent magnet, and the S pole face of the first permanent magnet on the other side corresponds to the N pole face of the corresponding second permanent magnet. A stronger magnetic field is generated by the layout of the double-layer permanent magnets. The rotating shaft is connected to the rotor. The rotor is rotated to rotate the coil embedded in the rotor. The coil cuts the magnetic lines of force to generate an induced current. The electromagnetic torque is generated by the action of the induced current and the magnetic field to accelerate the rotation of the rotor. A stronger magnetic field is generated by the structural layout of the double-layer permanent magnets, thereby increasing the strength of the overall electromagnetic torque.

[0037] Specifically, the surface of the rotor 100 is provided with a first harness groove 1000, a second harness groove 1001, and a semicircular harness groove 1002 connecting the first harness groove 1000 and the second harness groove 1001 at upper and lower ends, and the semicircular harness grooves 1002 at the upper and lower ends are in opposite directions;

[0038] A wire passes through the first harness groove 1000, the semicircular harness groove 1002 at one end, the second harness groove 1001, and the semicircular harness groove 1002 at the other end in sequence, and then circulates through the above path until all the harness slots in the harness groove are filled to form a coil structure 4. The coil structure 4 also includes two protruding positive and negative pins 40. The gaps between the harness slots in the first harness groove and the second harness groove are the same size. The positive and negative pins on the coil structure are respectively connected to the positive and negative interfaces on the power supply device. The use of the above coil structure can reduce the inductance of the current, shorten the power supply discharge time, and thus accelerate the rising edge of the torque wave.

[0039] Specifically, the gap between the first permanent magnet 2 and the second permanent magnet 3 corresponding to its position is greater than or equal to 8 mm. Reducing the gap between the first permanent magnet and the second permanent magnet can increase the range of action of the magnetic field, thereby improving the output power and overall efficiency of the motor.

[0040] Specifically, a through hole 12 for the pin 40 to pass through is provided on one side of the housing 1. The pins can be passed through the through hole to collect the pin positions and increase the aesthetics.

[0041] Specifically, the shell 1 includes an upper shell 13 and a lower shell 14 fixedly connected to the upper shell 13. The four corners of the bottom end of the upper shell 13 are recessed with limiting grooves 130, and the lower shell 14 is convexly provided with a first limiting protrusion 140 used in conjunction with the limiting groove 130. The use of the limiting groove and the limiting protrusion can ensure the position alignment between the upper shell and the lower shell, and at the same time, the use of some fixings can be omitted to save costs.

[0042] Specifically, the two ends of the rotor 100 are fixedly connected to the housing 1 and the inner magnetic yoke 11 through a first bearing 102 and a second bearing 103 respectively, and one end of the rotating shaft 101 is fixedly connected to the inner magnetic yoke 11 through a third bearing 104. The use of bearings has the advantages of low friction loss, long service life and strong load-bearing capacity.

[0043] Specifically, a plurality of limiting ribs 15 are convexly provided in the internal cavity of the shell 1, and a limiting recess 16 used in conjunction with the limiting ribs 15 is concavely provided on the outer yoke 10. The cooperation between the limiting ribs and the limiting recess can ensure that the outer yoke is fixed on the shell, thereby preventing the outer yoke from being displaced by force and causing damage to the motor.

[0044] The above are only preferred implementations of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. The motor module of the electromagnetic Hopkinson torsion bar test device is characterized in that: include: A housing (1), a right outer magnetic yoke (10) fixedly arranged inside the housing (1), a rotor (100) rotatably supported at both ends on the housing (1), and an inner magnetic yoke (11) fixed to the housing (1) and arranged inside the rotor (100), and a rotating shaft (101) arranged on the end surface of the rotor (100); A first permanent magnet (2), the first permanent magnet (2) being fixedly arranged on the outside of the inner magnetic yoke (11); a second permanent magnet (3), the second permanent magnet (3) being fixedly arranged on the inner side of the outer magnetic yoke (10), the second permanent magnet (3) corresponding to the first permanent magnet (2) in position and having opposite magnetic pole faces; A coil structure (4), wherein the coil structure (4) is embedded in the rotor (100).

2. The motor module of the electromagnetic Hopkinson torsion bar tester according to claim 1, characterized in that: The surface of the rotor (100) is provided with a first harness groove (1000), a second harness groove (1001), and a semicircular harness groove (1002) connecting the first harness groove (1000) and the second harness groove (1001) at upper and lower ends, and the semicircular harness grooves (1002) at the upper and lower ends are in opposite directions; A wire passes through the first harness groove (1000), the semicircular harness groove (1002) at one end, the second harness groove (1001), and the semicircular harness groove (1002) at the other end in sequence, and then circulates through the above path until all harness single grooves in the harness groove are filled to form a coil structure (4), wherein the coil structure (4) further comprises two protruding positive and negative pins (40).

3. The motor module of the electromagnetic Hopkinson torsion bar tester according to claim 1, characterized in that: The gap between the first permanent magnet (2) and the second permanent magnet (3) corresponding to the first permanent magnet (2) is greater than or equal to 8 mm.

4. The motor module of the electromagnetic Hopkinson torsion bar tester according to claim 2, characterized in that: A through hole (12) for the pin (40) to pass through is provided on one side of the housing (1).

5. The motor module of the electromagnetic Hopkinson torsion bar tester according to claim 1, characterized in that: The shell (1) comprises an upper shell (13) and a lower shell (14) fixedly connected to the upper shell (13); the upper shell (13) has four recessed limiting grooves (130) at the bottom corners; and the lower shell (14) has a first limiting protrusion (140) convexly provided on the lower shell (14) for use in conjunction with the limiting grooves (130).

6. The motor module of the electromagnetic Hopkinson torsion bar tester according to claim 1, characterized in that: Two ends of the rotor (100) are fixedly connected to the housing (1) and the inner magnetic yoke (11) via a first bearing (102) and a second bearing (103), respectively, and one end of the rotating shaft (101) is fixedly connected to the inner magnetic yoke (11) via a third bearing (104).

7. The motor module of the electromagnetic Hopkinson torsion bar tester according to claim 1, characterized in that: A plurality of limiting ribs (15) are convexly provided in the internal cavity of the shell (1), and a limiting recess (16) for use in conjunction with the limiting ribs (15) is concavely provided on the outer magnetic yoke (10).

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