A load device for motor type detection

Abstract

The application relates to the technical field of motor testing, and discloses a load device for motor type detection, which comprises a double-shaft motor, a torque and rotating speed sensor and a magnetic powder dynamometer, the torque and rotating speed sensor is connected with one output end of the double-shaft motor through a shaft coupling, the input end of the magnetic powder dynamometer is connected with the other output end of the double-shaft motor through a shaft coupling, and the outer wall of the magnetic powder dynamometer is communicated with a powder feeding mechanism, the powder feeding mechanism is arranged, the magnetic powder accumulated at the bottom of the annular air gap due to gravity is extracted through the conveying pipeline before motor type detection, and the magnetic powder is refilled into the annular air gap through the conveying pipeline at the top, so that the starting jamming problem caused by the magnetic powder accumulation is effectively solved, and the smooth testing is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of motor testing technology, and specifically relates to a load device for motor type testing. Background Technology

[0002] In modern industrial automation, servo motors are widely used in key areas such as CNC machine tools, robots, aerospace, and automated production lines. As a core power component, the performance and reliability of the servo motor directly determine the operational safety and efficiency of the entire machine. During the research and development and type testing phases of motors, rigorous load tests must be conducted to verify whether the motor meets IEC standards. These tests cover conventional electrical performance (such as voltage, current, and power factor) and mechanical characteristics. Currently, the main sources of motor loads rely on equipment such as electric dynamometers, brakes, or eddy current brakes. These devices simulate load torque and, in conjunction with high-precision power analyzers and torque sensors, obtain the motor's efficiency spectrum, temperature rise curve, and stall characteristics. Magnetic particle dynamometers are a commonly used load simulation device in motor testing, particularly suitable for testing scenarios involving high torque and low speed motors. By continuously or in stages loading, the operating characteristic curves of the motor under these load conditions are plotted, thereby verifying whether its rated efficiency, maximum torque, and temperature rise meet the type test standards.

[0003] The magnetic particle dynamometer consists of a stator, a solid rotor, an excitation coil, magnetic powder medium, a support, and a base plate. A very narrow annular air gap exists between the rotor and the stator, filled with magnetic powder. When the excitation coil is energized, a magnetic field is generated in the air gap. Under the influence of this magnetic field, the fine magnetic powder filling the gap aligns along the magnetic field lines, forming magnetic powder chains. The tension generated by these chains becomes the resistance preventing the rotor from rotating; this resistance is the load torque. By adjusting the magnitude of the excitation current, the load torque can be continuously and precisely changed. During high-speed rotor rotation, the magnetic powder is evenly thrown onto the inner wall of the rotor under centrifugal force. The magnetic powder chains in the annular air gap are very thin and evenly distributed, allowing the rotor to rotate freely.

[0004] When the rotor is not rotating and the excitation coil is not energized, both centrifugal force and magnetic force disappear. Under the influence of gravity, the magnetic powder settles to the bottom of the annular air gap, completely filling the bottom annular air gap space with a large amount of accumulated magnetic powder. When the magnetic powder dynamometer is running under high load for a long time, the temperature inside the annular air gap will continue to rise, causing the magnetic powder to oxidize. The oxidized magnetic powder has extremely poor fluidity. After the machine stops, it will not only settle but also stick together to form a dense state. In this case, when the motor is energized, it drives the rotor of the magnetic powder dynamometer to rotate. The accumulated magnetic powder at the bottom will jam the rotor, preventing it from rotating. At this time, a stall test can be performed. However, if a speed and torque test is required, the rotor needs to rotate, but at this time the rotor is already jammed. If the power is increased at this time, the motor current will rise sharply, which may eventually burn out the coil, making type testing impossible. Summary of the Invention

[0005] This invention provides a load device for motor type testing, which solves the technical problem in related technologies where, after a magnetic particle dynamometer stops, high-temperature magnetic powder accumulates and adheres to each other at the bottom of the annular air gap, forming a dense state, which causes the rotor to easily get stuck when restarted.

[0006] This invention provides a load device for motor type testing, comprising a dual-axis motor, a torque-speed sensor, and a magnetic particle dynamometer. The torque-speed sensor is connected to one output end of the dual-axis motor via a coupling, and the input end of the magnetic particle dynamometer is connected to the other output end of the dual-axis motor via a coupling. A powder feeding mechanism is connected to the outer wall of the magnetic particle dynamometer. The powder feeding mechanism includes a conveying component, a hollow positioning block, and an arc-shaped plate. Both the input and output ends of the conveying component are fixedly connected to conveying pipes. The hollow positioning block is fixedly installed at the upper and lower arc apexes of the magnetic particle dynamometer. The end of the conveying pipe at the output end of the conveying component is connected to the hollow positioning block at the top of the magnetic particle dynamometer, and the end of the conveying pipe at the input end of the conveying component is connected to the hollow positioning block at the bottom of the magnetic particle dynamometer. An arc-shaped plate is fixedly installed at the end of the hollow positioning block facing the magnetic particle dynamometer, and the arc-shaped plate is integrally formed on the inner wall of the annular air gap of the magnetic particle dynamometer.

[0007] In a preferred embodiment, a positioning frame is fixedly connected to the outer wall of the conveying component. The positioning frame is used to support the conveying component. The conveying component is set at the same height as the magnetic particle dynamometer, and the positioning frame is located on the side of the magnetic particle dynamometer.

[0008] In a preferred embodiment, a circular groove is formed at the center of the arc-shaped plate facing the annular air gap. A sealing plate is fitted inside the circular groove, and the shape of the sealing plate is adapted to the circular groove. A connecting block is integrally formed at the bottom of the sealing plate.

[0009] In a preferred embodiment, a first linear telescopic component is provided diagonally opposite to the inner cavity of the hollow positioning block. The first linear telescopic component is located below the arc plate. The output end of the first linear telescopic component is rotatably connected to a push rod. The other end of the push rod is rotatably connected to a connecting block. The connecting block is slidably connected inside the arc plate. A through hole is provided at the junction of the arc plate and the connecting block. The length of the connecting block is longer than the depth of the through hole.

[0010] In a preferred embodiment, the bottom of the circular groove is connected to a vertical pipe, which is inserted into the interior of the conveying pipe, and multiple vertical pipes surround the edge of the connecting block.

[0011] In a preferred embodiment, driving components are fixedly installed on both sides of the hollow positioning block. A turntable is fixedly connected to the output end of the driving component. A striking rod is rotatably installed on the edge of the turntable. The striking rod is connected to the turntable by a torsion spring, and the striking rod is evenly distributed along the circumference of the turntable.

[0012] In a preferred embodiment, a thickened strip is integrally formed at the edge of the lower surface of the arc plate. One side of the thickened strip is in contact with the inner wall of the hollow positioning block. The thickened strip is located directly above the turntable, and the turntable drives the striking rod to strike the thickened strip.

[0013] In a preferred embodiment, the bottom of the magnetic particle dynamometer is provided with a reversing mechanism, which includes a first base and a second base. The second base is located at the bottom of the magnetic particle dynamometer, the first base is fixedly installed at the bottom of the dual-axis motor base, the second base is located at one end of the first base, and a guide rod is integrally formed on the end of the second base facing the first base. The guide rod is slidably connected to the first base.

[0014] In a preferred embodiment, a second linear telescopic component is fixedly installed on the upper surface of the first base, a bending plate is fixedly installed on the bottom of the magnetic particle dynamometer, the bending plate is rotatably connected to the second base, a limit plate is fixedly installed at the output end of the second linear telescopic component, the vertical plate of the bending plate is inserted into the limit plate, a rectangular opening is provided inside the vertical plate of the bending plate, and the second linear telescopic component passes through the rectangular opening.

[0015] In a preferred embodiment, a threaded drive assembly is fixedly installed inside the second base. The end of the threaded drive assembly is threadedly connected to a connecting plate. Both ends of the connecting plate are integrally formed with toothed plates. The toothed plates are slidably disposed at the edge of the upper surface of the second base. A strip groove is provided at the junction of the second base and the toothed plates. Driven gears are fixedly installed on both sides of the bent plate. The toothed plates mesh with the driven gears, and the toothed plates are located at the bottom of the driven gears.

[0016] The beneficial effects of this invention are as follows: 1. This invention can perform stall torque testing on a dual-shaft motor and load testing on the motor with only one installation. By setting up a powder feeding mechanism, before the motor type test, the magnetic powder accumulated at the bottom of the annular air gap due to gravity settlement is extracted through the conveying pipe, and then refilled into the annular air gap through the top conveying pipe. This effectively solves the problem of starting jamming caused by magnetic powder accumulation and ensures the smooth progress of the test.

[0017] 2. By setting up a driving component, a turntable and a striking rod, the present invention can break up the clumps of magnetic powder with high-frequency vibration, ensuring that the magnetic powder can be smoothly extracted and evenly distributed.

[0018] 3. By setting a reversing mechanism, the present invention can adjust the magnetic powder dynamometer to a horizontal state during powder feeding, so that the magnetic powder is more evenly distributed in the annular air gap, thereby ensuring the accuracy and stability of subsequent load testing. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0020] Figure 2 This is a front view of the present invention.

[0021] Figure 3 This is a three-dimensional structural diagram of the powder feeding mechanism, the reversing mechanism, and the magnetic powder dynamometer of the present invention.

[0022] Figure 4 This is a schematic diagram showing the disassembled structure of the first base and the second base of the present invention.

[0023] Figure 5 This is a schematic diagram of the planar structure of the powder feeding mechanism and the reversing mechanism of the present invention.

[0024] Figure 6 This is a three-dimensional structural diagram of the second base and hollow positioning block of the present invention.

[0025] Figure 7 This is a schematic diagram of the three-dimensional structure of the hollow positioning block and the arc-shaped plate of the present invention.

[0026] Figure 8 This is a schematic diagram of the internal structure of the hollow positioning block of the present invention.

[0027] Figure 9 This is a bottom view of the arc-shaped plate of the present invention.

[0028] Figure 10 This is a schematic diagram of the planar structure of the turntable and striking rod of the present invention.

[0029] Figure 11 This is a schematic diagram showing the disassembled structure of the sealing plate and the arc-shaped plate of the present invention.

[0030] In the diagram: 1. Dual-axis motor; 2. Torque and speed sensor; 3. Magnetic powder dynamometer; 4. Powder feeding mechanism; 41. Positioning frame; 42. Conveying component; 43. Conveying pipe; 44. Hollow positioning block; 45. Arc plate; 46. Sealing plate; 47. Drive component; 48. First linear telescopic component; 49. Push rod; 410. Vertical tube; 411. Connecting block; 412. Turntable; 413. Striking rod; 414. Thickened strip; 415. Circular groove; 416. Through hole; 5. Directional change mechanism; 51. First base; 52. Second base; 53. Bending plate; 54. Second linear telescopic component; 55. Limiting plate; 56. Guide rod; 57. Threaded drive assembly; 58. Rectangular opening; 59. Driven gear; 510. Toothed plate; 511. Strip groove; 512. Connecting plate. Detailed Implementation

[0031] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0032] Example 1 like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, a load device for motor type testing includes a dual-axis motor 1, a torque-speed sensor 2, and a magnetic particle dynamometer 3. The torque-speed sensor 2 is connected to one output end of the dual-axis motor 1 via a coupling. The input end of the magnetic particle dynamometer 3 is connected to the other output end of the dual-axis motor 1 via a coupling. A powder feeding mechanism 4 is connected to the outer wall of the magnetic particle dynamometer 3. The powder feeding mechanism 4 includes a conveying component 42, a hollow positioning block 44, and an arc-shaped plate 45. The input and output ends of the conveying component 42 are both fixed. A conveying pipe 43 is connected to the magnetic particle dynamometer 3. A hollow positioning block 44 is fixedly installed at the upper and lower arc tops of the magnetic particle dynamometer 3. The end of the conveying pipe 43 at the output end of the conveying component 42 is connected to the hollow positioning block 44 at the top of the magnetic particle dynamometer 3. The end of the conveying pipe 43 at the input end of the conveying component 42 is connected to the hollow positioning block 44 at the bottom of the magnetic particle dynamometer 3. An arc plate 45 is fixedly installed at the end of the hollow positioning block 44 facing the magnetic particle dynamometer 3. The arc plate 45 is integrally formed on the inner wall of the annular air gap of the magnetic particle dynamometer 3.

[0033] It should be noted that during type testing, the torque-speed sensor 2 is connected to one output terminal of the dual-axis motor 1 via a coupling, and the other output terminal of the dual-axis motor 1 is connected to the input terminal of the magnetic particle dynamometer 3 via a coupling. The magnetic particle dynamometer 3 simulates the motor load. During use, the load torque is changed by gradually adjusting the magnitude of the excitation current. The torque-speed sensor 2 can detect the data of the dual-axis motor 1 at this time. Only one installation is needed to realize the stall torque test of the dual-axis motor 1, and also to realize the motor loading test. Before the test, since the magnetic particle dynamometer 3 is in a stopped state, the magnetic powder will accumulate at the bottom of the annular air gap. Therefore, before the type test, the conveying component 42 of the powder feeding mechanism 4 needs to be started first. The conveying component 42 extracts the magnetic powder from the bottom of the annular air gap and then sends the magnetic powder back to the top of the annular air gap through the conveying pipe 43, allowing the magnetic powder to refill the annular air gap, thereby avoiding the situation where a large amount of magnetic powder accumulates at the bottom of the annular air gap. The conveying pipe 43 is connected to the hollow positioning block 44. The hollow positioning block 44 determines the position for powder extraction and delivery. Magnetic powder is extracted from the hollow positioning block 44 at the bottom of the annular air gap and then sent back into the annular air gap from the hollow positioning block 44 at the top. An arc-shaped plate 45 is provided on the side of the hollow positioning block 44 facing the annular air gap. The shape of the arc-shaped plate 45 is adapted to the shape of the annular air gap and will not change the shape of the annular air gap, thus not affecting the normal arrangement of the magnetic powder. The conveying component 42 is specifically a pneumatic conveying pump and its supporting components, which is an existing and mature technology and will not be described in detail here. The conveying pipe 43 located at the bottom of the annular air gap is also provided with a branch. The end of the branch is provided with a solenoid valve. When the magnetic powder is extracted, the solenoid valve remains closed. After the magnetic powder at the bottom of the annular air gap is extracted, the outlet of the magnetic powder is blocked to prevent magnetic powder leakage. At this time, the solenoid valve opens, allowing the conveying component 42 to extract external air. The magnetic powder is temporarily placed in the conveying pipe 43. After the air and magnetic powder are injected into the annular air gap together, the air can be discharged from the original seal of the annular air gap of the magnetic powder dynamometer 3. The seal will block the magnetic powder.

[0034] Furthermore, such as Figure 2 , Figure 3 , Figure 4 , Figure 9 , Figure 10 and Figure 11As shown, a positioning frame 41 is fixedly connected to the outer wall of the conveying component 42. The positioning frame 41 is used to support the conveying component 42. The conveying component 42 is set at the same height as the magnetic particle dynamometer 3, and the positioning frame 41 is located on the side of the magnetic particle dynamometer 3. A circular groove 415 is opened at the center of the arc plate 45 facing the annular air gap. A sealing plate 46 is fitted inside the circular groove 415, and the shape of the sealing plate 46 is adapted to the circular groove 415. A connecting block 411 is integrally formed at the bottom of the sealing plate 46. A first linear telescopic component 48 is arranged diagonally opposite to the inner cavity of the hollow positioning block 44. A linear telescopic component 48 is located below the arc plate 45. The output end of the first linear telescopic component 48 is rotatably connected to a push rod 49. The other end of the push rod 49 is rotatably connected to a connecting block 411. The connecting block 411 is slidably connected inside the arc plate 45. A through hole 416 is provided at the junction of the arc plate 45 and the connecting block 411. The length of the connecting block 411 is longer than the depth of the through hole 416. The bottom of the circular groove 415 is connected to a vertical pipe 410. The vertical pipe 410 is inserted into the inside of the conveying pipe 43. Multiple vertical pipes 410 surround the edge of the connecting block 411.

[0035] It should be noted that the positioning frame 41 is used to support and protect the conveying component 42, ensuring the stability of the conveying component 42. The conveying component 42 is set at the same height as the magnetic particle dynamometer 3 and is located on its side, so it will not affect the normal operation of the magnetic particle dynamometer 3. A circular groove 415 is opened on the arc plate 45 to accommodate the sealing plate 46. The sealing plate 46 is used to seal the vertical pipe 410. In the initial state, the sealing plate 46 and the arc plate 45 are fitted into the inner wall of the annular air gap. When it is necessary to remove the magnetic powder from the bottom of the annular air gap, the first linear telescopic component 48 is activated. The first linear telescopic component 48 is a miniature electric cylinder. When its piston rod extends, it pushes the push rod 49. The other end of the push rod 49 is rotatably connected to the connecting block 411 at the bottom of the sealing plate 46. The first linear telescopic component 48 is horizontally fixed inside the hollow positioning block 44. Therefore, the push rod 49 will gradually rotate from the inclined state to the vertical state. This process In the middle, the sealing plate 46 can be lifted upward, pushing the sealing plate 46 out of the circular groove 415, exposing the entrance of the vertical tube 410 at the bottom of the circular groove 415. At this time, the conveying component 42 can extract the magnetic powder on the arc plate 45. After the magnetic powder is extracted, the piston rod of the first linear telescopic component 48 retracts, pulling the sealing plate 46 back into the circular groove 415 to ensure the integrity of the annular air gap. At this time, the sealing plate 46 blocks the entrance of the vertical tube 410 and also prevents the magnetic powder from leaking. In the arc plate 45, a through hole 416 is provided to accommodate the connecting block 411, and the shape of the through hole 416 is adapted to the connecting block 411. The sliding fit can ensure that the sealing plate 46 can move up and down, and prevent the magnetic powder from falling into the hollow positioning block 44 from the through hole 416. After the magnetic powder is sent back to the annular air gap, the sealing plate 46 at the top of the annular gap is pulled back into the circular groove 416.

[0036] Example 2 like Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown, since the working principle of the magnetic particle dynamometer 3 is essentially to convert the output energy of the motor into heat for consumption, during long-term high-load operation, the temperature of the annular air gap continues to rise, and the magnetic powder will clump at high temperature. The clumped magnetic powder cannot be extracted by the conveying component 42 and thus remains in the annular air gap. This results in some magnetic powder not being transferred out, and some magnetic powder still remaining at the bottom of the annular air gap, affecting the normal rotation of the rotor. In order to solve the problem that the clumped magnetic powder cannot be extracted by the conveying component 42, this application further provides the following technical solution.

[0037] Both sides of the hollow positioning block 44 are fixedly installed with driving components 47. The output end of the driving component 47 is fixedly connected to a turntable 412. A striking rod 413 is rotatably installed on the edge of the turntable 412. The striking rod 413 is connected to the turntable 412 by a torsion spring. The striking rod 413 is evenly distributed along the circumference of the turntable 412. A thickened strip 414 is integrally formed on the edge of the lower surface of the arc plate 45. One side of the thickened strip 414 is in contact with the inner sidewall of the hollow positioning block 44. The thickened strip 414 is located directly above the turntable 412. The turntable 412 drives the striking rod 413 to strike the thickened strip 414.

[0038] It should be noted that the driving component 47 is a miniature servo motor. During its operation, it rapidly drives the turntable 412 to rotate. During the rotation of the turntable 412, the striking rod 413 strikes the thickened strip 414 at high frequency. The striking of the thickened strip 414 causes the arc plate 45 to vibrate, breaking up the clumps of magnetic powder. The broken-up magnetic powder is more easily loosened when pushed upward by the sealing plate 46, allowing the clumps of magnetic powder to be extracted by the conveying component 42. The striking rod 413 operates by twisting... The force spring is connected to the turntable 412. When it comes into contact with the thickened strip 414, it will immediately rotate around the connection point with the turntable 412 to ensure that the striking rod 413 will not affect the rotation of the turntable 412. Similarly, when the striking rod 413 rotates to contact the hollow positioning block 44, it will also rotate around the connection point with the turntable 412. After the striking rod 413 separates from the thickened strip 414 and the hollow positioning block 44, the rebound of the torsion spring can bounce the striking rod 413 back to the initial angle.

[0039] Example 3 like Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, when the magnetic powder is delivered to the top of the annular air gap by the conveying component 42, since the magnetic powder dynamometer 3 is still in a vertical state, the returned magnetic powder is still easy to slide down to the bottom along the annular air gap under the action of gravity. If the magnetic powder is attracted by energizing the excitation coil during the powder delivery process, it is easy for the magnetic powder to accumulate in the top area of ​​the annular air gap, resulting in uneven distribution of the magnetic powder in the annular air gap, which in turn affects the subsequent braking effect. In order to ensure that the magnetic powder can be evenly distributed in the annular air gap, this application further provides the following technical solution.

[0040] The magnetic particle dynamometer 3 has a reversing mechanism 5 at its bottom. The reversing mechanism 5 includes a first base 51 and a second base 52. The second base 52 is located at the bottom of the magnetic particle dynamometer 3. The first base 51 is fixedly installed at the bottom of the base of the dual-axis motor 1. The second base 52 is located at one end of the first base 51. A guide rod 56 is integrally formed on the end of the second base 52 facing the first base 51. The guide rod 56 is slidably connected to the first base 51. A second linear telescopic component 54 is fixedly installed on the upper surface of the first base 51. A bending plate 53 is fixedly installed at the bottom of the magnetic particle dynamometer 3. The bending plate 53 is rotatably connected to the second base 52. A limit plate 55 is fixedly installed at the output end of the second linear telescopic component 54. The vertical plate of the bending plate 53 is inserted into the limiting plate 55. A rectangular opening 58 is provided inside the vertical plate of the bending plate 53. The second linear telescopic component 54 passes through the rectangular opening 58. A threaded drive assembly 57 is fixedly installed inside the second base 52. A connecting plate 512 is threadedly connected to the end of the threaded drive assembly 57. Both ends of the connecting plate 512 are integrally formed with toothed plates 510. The toothed plates 510 are slidably disposed at the edge of the upper surface of the second base 52. A strip groove 511 is provided at the junction of the second base 52 and the toothed plates 510. Driven gears 59 are fixedly installed on both sides of the bending plate 53. The toothed plates 510 mesh with the driven gears 59, and the toothed plates 510 are located at the bottom of the driven gears 59.

[0041] It should be noted that when the conveying component 42 extracts magnetic powder, the angle of the magnetic powder dynamometer 3 can be adjusted to a horizontal state by the reversing mechanism 5. First, the second linear telescopic component 54 is activated. The second linear telescopic component 54 is an electric cylinder. The piston rod of the second linear telescopic component 54 extends and pushes the bending plate 53 away from the first base 51 through the limiting plate 55. The limiting plate 55 is specifically an H-shaped structure. The bending plate 53 passes through the rectangular opening 58. The device is inserted above the limiting plate 55. Then, the threaded drive assembly 57 is activated. The threaded drive assembly 57 drives the connecting plate 512, causing it to move towards the second base 52. The toothed plates 510 at both ends of the connecting plate 512 move along the strip groove 511 and mesh with the driven gear 59, causing the entire bent plate 53 to rotate. The driven gear 59 is specifically located on both sides of the connection between the bent plate 53 and the second base 52, determining the rotation center of the bent plate 53. The bent plate 53 drives the entire magnetic powder dynamometer 3. The magnetic powder dynamometer 3 eventually rotates until one end is in contact with the upper surface of the second base 52. At this point, the annular air gap is horizontal, allowing the returned magnetic powder to be horizontally distributed within the annular air gap. Furthermore, the air flows out slowly from the sealing strip, preventing the magnetic powder from being carried away in large quantities, thus ensuring that the magnetic powder can be more effectively distributed. The magnetic powder is evenly distributed in the annular air gap. Then, the excitation coil of the magnetic powder dynamometer 3 is energized. After the magnetic powder is arranged, the thread drive assembly 57 is activated to push the connecting plate 512 away from the second base 52, so that the bending plate 53 rotates back to the initial angle. Finally, one end of the bending plate 53 will be reinserted into the limiting plate 55. At this time, the piston rod of the second linear telescopic component 54 is controlled to retract, and the bending plate 53 is pulled through the limiting plate 55, so that the input end of the magnetic powder dynamometer 3 is connected to the coupling. During this process, the second base 52 will move together with the bending plate 53. The guide rod 56 can determine the movement path of the second base 52. This structure can both make the magnetic powder dynamometer 3 rotate to a horizontal state, so that the magnetic powder is more evenly distributed, and ensure that the magnetic powder dynamometer 3 can still maintain alignment with the coupling after rotating back.

[0042] Working principle of the invention: Before conducting motor type testing, the torque and speed sensor 2 is first connected to one of the output terminals of the dual-axis motor 1 via a coupling, and the input terminal of the magnetic particle dynamometer 3 is connected to the other output terminal of the dual-axis motor 1 via a coupling. During testing, the dual-axis motor 1 drives the system to operate, and the load torque is changed by gradually adjusting the excitation current of the magnetic particle dynamometer 3. The torque and speed sensor 2 detects and feeds back the operating data of the dual-axis motor 1 in real time, thereby completing the motor performance evaluation.

[0043] Because magnetic powder accumulates in large quantities at the bottom of the annular air gap under gravity when the magnetic particle dynamometer 3 is stopped, it is prone to jamming during startup. Therefore, before testing, the first linear telescopic component 48 needs to be activated to push the push rod 49, lift the connecting block 411 upward, and drive the sealing plate 46 out of the circular groove 415, exposing the entrance of the vertical tube 410 for powder extraction. Then, the conveying component 42 is activated. The conveying component 42 extracts the magnetic powder accumulated at the bottom of the annular air gap through the vertical tube 410 via the conveying pipe 43 at the bottom and temporarily stores it in the conveying pipe 43. After the powder extraction is completed, the first linear telescopic component 48 retracts, pulls the sealing plate 46 back and fits it into the circular groove 415, sealing the entrance of the vertical tube 410.

[0044] Then, the solenoid valve on the branch pipe is opened to draw in external air. Using pneumatic power, the temporarily stored magnetic powder is sent back to the top of the annular air gap through the top conveying pipe 43 and the hollow positioning block 44, thus preventing a large amount of magnetic powder from accumulating at the bottom. After the air and magnetic powder are injected into the annular air gap together, the air can be smoothly discharged from the seal of the annular air gap, while the seal will block the magnetic powder, thus achieving gas-solid separation.

[0045] To address the problem of magnetic powder oxidizing and agglomerating in the annular air gap due to prolonged high-load operation, the drive components 47 on both sides of the hollow positioning block 44 are activated to drive the turntable 412 to rotate, causing the striking rod 413 to strike the thickened strip 414 on the edge of the arc plate 45 at high frequency. The vibration breaks up the agglomerated magnetic powder, making it easier for the conveying component 42 to extract it.

[0046] To ensure a more uniform distribution of the magnetic powder returned to the annular air gap, the reversing mechanism 5 is activated. The second linear telescopic component 54 pushes the bending plate 53 through the limiting plate 55, disengaging the magnetic powder dynamometer 3 from the coupling. Subsequently, the threaded drive assembly 57 drives the connecting plate 512, which, through the meshing of the toothed plates 510 at both ends of the connecting plate 512 with the driven gears 59, rotates the bending plate 53 and the entire magnetic powder dynamometer 3 to a horizontal position. In this horizontal position, the magnetic powder is fed, allowing it to naturally spread evenly in the annular air gap. After uniformity, the excitation coil of the magnetic particle dynamometer 3 is energized. After the magnetic powder is arranged, the sealing plate 46 at the top of the annular gap is pulled back and fitted into the circular groove 416. Then, the thread drive assembly 57 is started to push the connecting plate 512 away from the second base 52, so that the bending plate 53 rotates back to the initial angle. Finally, one end of the bending plate 53 will be reinserted into the limiting plate 55. At this time, the piston rod of the second linear telescopic component 54 is controlled to retract, and the bending plate 53 is pulled through the limiting plate 55, so that the input end of the magnetic particle dynamometer 3 is connected to the coupling.

[0047] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A load device for motor type testing, comprising a dual-shaft motor (1), a torque-speed sensor (2), and a magnetic particle dynamometer (3), wherein the torque-speed sensor (2) is connected to one output end of the dual-shaft motor (1) via a coupling, and the input end of the magnetic particle dynamometer (3) is connected to the other output end of the dual-shaft motor (1) via a coupling, characterized in that, The outer wall of the magnetic particle dynamometer (3) is connected to a powder feeding mechanism (4). The powder feeding mechanism (4) includes a conveying component (42), a hollow positioning block (44), and an arc plate (45). The input and output ends of the conveying component (42) are both fixedly connected to a conveying pipe (43). The hollow positioning block (44) is fixedly installed at the upper and lower arc tops of the magnetic powder dynamometer (3). The end of the conveying pipe (43) at the output end of the conveying component (42) is connected to the hollow positioning block (44) at the top of the magnetic powder dynamometer (3). The end of the conveying pipe (43) at the input end of the conveying component (42) is connected to the hollow positioning block (44) at the bottom of the magnetic powder dynamometer (3). An arc plate (45) is fixedly installed at the end of the hollow positioning block (44) facing the magnetic powder dynamometer (3). The arc plate (45) is integrally formed on the inner wall of the annular air gap of the magnetic powder dynamometer (3).

2. The load device for motor type testing according to claim 1, characterized in that, A positioning frame (41) is fixedly connected to the outer wall of the conveying component (42). The positioning frame (41) is used to support the conveying component (42). The conveying component (42) is set at the same height as the magnetic particle dynamometer (3), and the positioning frame (41) is located on the side of the magnetic particle dynamometer (3).

3. The load device for motor type testing according to claim 2, characterized in that, The arc plate (45) has a circular groove (415) at the center of the side facing the annular air gap. A sealing plate (46) is fitted inside the circular groove (415), and the shape of the sealing plate (46) is adapted to the circular groove (415). A connecting block (411) is integrally formed at the bottom of the sealing plate (46).

4. A load device for motor type testing according to claim 3, characterized in that, The hollow positioning block (44) has a first linear telescopic component (48) arranged diagonally opposite to each other. The first linear telescopic component (48) is located below the arc plate (45). The output end of the first linear telescopic component (48) is rotatably connected to a push rod (49). The other end of the push rod (49) is rotatably connected to a connecting block (411). The connecting block (411) is slidably connected inside the arc plate (45). A through hole (416) is provided at the junction of the arc plate (45) and the connecting block (411). The length of the connecting block (411) is longer than the depth of the through hole (416).

5. A load device for motor type testing according to claim 4, characterized in that, The bottom of the circular groove (415) is connected to a vertical pipe (410), which is inserted into the inside of the conveying pipe (43). Multiple vertical pipes (410) surround the edge of the connecting block (411).

6. A load device for motor type testing according to claim 5, characterized in that, Both sides of the hollow positioning block (44) are fixedly installed with driving components (47). The output end of the driving component (47) is fixedly connected to a turntable (412). A striking rod (413) is rotatably installed at the edge of the turntable (412). The striking rod (413) is connected to the turntable (412) by a torsion spring, and the striking rod (413) is evenly distributed along the circumference of the turntable (412).

7. A load device for motor type testing according to claim 6, characterized in that, A thickened strip (414) is integrally formed at the edge of the lower surface of the arc plate (45). One side of the thickened strip (414) is in contact with the inner wall of the hollow positioning block (44). The thickened strip (414) is located directly above the turntable (412). The turntable (412) drives the striking rod (413) to strike the thickened strip (414).

8. A load device for motor type testing according to claim 1, characterized in that, The magnetic particle dynamometer (3) is provided with a reversing mechanism (5) at its bottom. The reversing mechanism (5) includes a first base (51) and a second base (52). The second base (52) is located at the bottom of the magnetic particle dynamometer (3). The first base (51) is fixedly installed at the bottom of the base of the dual-axis motor (1). The second base (52) is located at one end of the first base (51). The second base (52) has a guide rod (56) integrally formed at the end facing the first base (51). The guide rod (56) is slidably connected to the first base (51).

9. A load device for motor type testing according to claim 8, characterized in that, A second linear telescopic component (54) is fixedly installed on the upper surface of the first base (51), and a bent plate (53) is fixedly installed at the bottom of the magnetic particle dynamometer (3). The bent plate (53) is rotatably connected to the second base (52). A limit plate (55) is fixedly installed at the output end of the second linear telescopic component (54). The vertical plate of the bent plate (53) is inserted into the limit plate (55). A rectangular opening (58) is opened inside the vertical plate of the bent plate (53), and the second linear telescopic component (54) passes through the rectangular opening (58).

10. A load device for motor type testing according to claim 9, characterized in that, The second base (52) is internally fixedly installed with a threaded drive assembly (57). The end of the threaded drive assembly (57) is threadedly connected to a connecting plate (512). Both ends of the connecting plate (512) are integrally formed with toothed plates (510). The toothed plates (510) are slidably disposed at the edge of the upper surface of the second base (52). A strip groove (511) is provided at the junction of the second base (52) and the toothed plates (510). Both sides of the bent plate (53) are fixedly installed with driven gears (59). The toothed plates (510) mesh with the driven gears (59), and the toothed plates (510) are located at the bottom of the driven gears (59).

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