Testing device for fatigue performance of permanent magnet synchronous roller motor

Abstract

The invention relates to the technical field of motor testing, in particular to a permanent magnet synchronous roller motor fatigue performance testing device which comprises a base and a roller motor, a belt roller and a water tank which are located on one side of the roller motor are further installed on the base, and a rotating shaft at one end of the belt roller is rotatably inserted into the side wall of the water tank. The rotating shaft extends into the water tank and is fixedly connected with a load assembly; the load assembly comprises a rotary drum, a plurality of movable poking pieces are inserted into the outer wall of the rotary drum, and an adjusting assembly is installed at the end, away from the belt roller, of the water tank. The roller motor is connected with the belt roller, the belt roller is connected with the load assembly, the load assembly is arranged in the sealed water tank, a load is generated in the mode that the movable stirring piece rotates to stir water, the situation that the load assembly falls off is avoided, generated vibration is weakened by water, the safety coefficient is greatly reduced, and the service life of the water tank is prolonged. And the test environment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motor testing, and in particular to a testing device for fatigue performance of a permanent magnet synchronous drum motor. Background Art

[0002] Drum motor fatigue testing subjects drum motors (typically used in transmission, conveying, and transportation systems) to long-term operating conditions that simulate operational conditions. The goal is to evaluate their performance, durability, and reliability under repeated loads, vibration, and temperature fluctuations. Fatigue testing can identify potential failure modes over long periods of operation and predict their service life, providing a basis for product design, optimization, and quality control.

[0003] After searching, the Chinese invention patent with announcement number CN118362887B provides a drum motor testing device based on different load simulations, including a support platform, a plurality of groups of support frames distributed in pairs are fixedly installed on the top of the support platform, and a fixing device is provided between each group of support frames. A movable device is installed on the top of the movable device, and a plurality of test devices cooperating with the fixing device are installed on the top of the movable device. A plurality of load components are installed on the test device, and a speed sensor is also installed on the top of the support platform.

[0004] At present, as described in the above patent, when performing load testing on a drum motor, the load size is generally adjusted by adding a load module to the drum surface. Since the drum rotates continuously during the test, if the load module is not firmly fixed to the drum surface, it is easy for the load module to fall off and be thrown out. The test process is generally time-consuming, resulting in a significant increase in the risk factor of this process. In addition, when the drum motor starts to rotate, the motor needs to directly drive the load to work together. Before it rotates to a stable speed, the motor will produce large vibrations, loud noises, and poor stability. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a testing device for the fatigue performance of a permanent magnet synchronous drum motor, which can effectively solve the problem that the prior art method of installing a load module on the drum surface for testing has many drawbacks.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A device for testing the fatigue performance of a permanent magnet synchronous drum motor comprises a base and a drum motor. A belt roller and a water tank are mounted on the base. A rotating shaft at one end of the belt roller is rotatably inserted into a side wall of the water tank. The rotating shaft extends into the water tank and is fixedly connected to a load assembly. Among them, the load component includes a rotating drum, and a plurality of movable paddles are inserted on the outer wall of the rotating drum. An adjustment component is installed on the end of the water tank away from the belt roller. The extension length of each movable paddle is controlled by the adjustment component to adjust the load on the drum motor.

[0007] In the above-mentioned testing device for fatigue performance of permanent magnet synchronous drum motor, the movable paddle is elastically inserted into the rotating drum, and a socket is formed at one end of the rotating drum away from the rotating shaft. The bottom end of the movable paddle extends into the socket and is formed with an oblique opening. The adjustment assembly includes a connecting cylinder fixedly mounted on the outer wall of the water tank, wherein a push rod is inserted into the connecting cylinder in the form of a piston pair. After the push rod enters the insertion hole, the movable paddle is pushed outward through the oblique opening at the bottom end of the movable paddle.

[0008] In the above-mentioned testing device for fatigue performance of permanent magnet synchronous drum motor, the movable paddles are provided in multiple groups, each group of movable paddles is provided with at least three, and the movable paddles in each group are distributed at equal distances along the length direction of the rotating drum.

[0009] In the above-mentioned testing device for the fatigue performance of the permanent magnet synchronous drum motor, the adjustment assembly also includes a knob, a threaded rod screwed onto the top rod is rotatably installed in the connecting tube, and the knob is installed at the end of the threaded rod. By turning the knob, the threaded rod is driven to rotate so that the top rod moves back and forth.

[0010] In the above-mentioned testing device for fatigue performance of permanent magnet synchronous drum motor, the end of the push rod away from the knob is sleeved with a rotating sleeve.

[0011] In the above-mentioned testing device for fatigue performance of permanent magnet synchronous drum motor, a ball is installed at the bottom end of each movable paddle.

[0012] In the above-mentioned testing device for fatigue performance of permanent magnet synchronous drum motor, a buffer assembly located below the load assembly is also installed in the water tank, and the buffer assembly includes a rotating rod, and a plurality of small paddles are installed on the outer wall of the rotating rod. One end of the rotating rod is installed on the movable block through a bearing, and a mounting frame for the movable block to move up and down is provided on the inner wall of the water tank. A first gear is installed on the rotating shaft, and a second gear is installed on the rotating rod. An electromagnet is installed on the top of the mounting frame, and a galvanized iron block is installed on the top of the movable block. When the electromagnet is energized, it attracts the movable block to move upward to engage the first gear and the second gear.

[0013] In the above-mentioned testing device for fatigue performance of permanent magnet synchronous drum motor, a groove is provided on the inner wall of the connecting tube, a first conductive ring piece is installed at the opening of the groove, a second conductive ring piece is attached to the inner wall of the groove, a mounting seat is provided on the threaded rod, and a top block is elastically inserted on the outer wall of the mounting seat. When the rotation speed of the threaded rod exceeds a threshold, the top block extends and squeezes the first conductive ring piece and the second conductive ring piece to fit together, so that the electromagnet is energized.

[0014] In the above-mentioned testing device for fatigue performance of permanent magnet synchronous drum motor, a sealing cover is installed on the top of the water tank.

[0015] In the above-mentioned testing device for fatigue performance of permanent magnet synchronous drum motor, both ends of the drum motor are provided with mounting brackets, and one of the mounting brackets is movably arranged.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention connects a drum motor to a belt roller, which is connected to a load assembly. The load assembly is placed in a sealed water tank, and a movable paddle rotates to pry water to generate a load. This prevents the load assembly from falling off, and the vibration generated is greatly reduced by the weakening of the water body, thereby increasing the safety factor and improving the test environment. An adjustment component and multiple groups of movable paddles are set. By adjusting the length of the extended push rod, the number of extended movable paddles can be changed, thereby adjusting the load size. It has a wide range of uses and improves the flexibility of the equipment. A buffer component is provided. When the knob is rotated too fast, the push rod advances faster and the load increases faster. At this time, the movable paddle also extends quickly, causing the water balance in the water tank to be broken and the water vibration to intensify. At this time, the push block on the threaded rod will extend outward under the action of centrifugal force, squeezing the first conductive ring piece to contact the second conductive ring piece, energizing the electromagnet, driving the movable block to move upward, and the first gear and the second gear to engage. The rotating drum will drive the rotating rod to rotate, and the small paddle on it and the movable paddle rotate in opposite directions, generating a recoil force on the water body, weakening the vibration, thereby avoiding large vibration of the equipment when the adjustment range is too large, and further improving the stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is the left schematic diagram of the present invention; Figure 3 A top view of the present invention; Figure 4 Schematic diagram of the cooperation between the load assembly and the ejector rod of the present invention; Figure 5 Schematic diagram of the bottom structure of the load assembly of the present invention; Figure 6 for Figure 2 Partial cross-sectional view of AA in FIG; Figure 7 It is a front view schematic diagram of the internal structure of the water tank of the present invention; Figure 8 A schematic diagram of the coordination of the load assembly and the buffer assembly of the present invention; Figure 9 for Figure 6 A magnified view of the structure at position B in FIG; Figure 10 for Figure 8 Magnified view of the structure at position C in .

[0019] The numbers in the figure represent: 1. base; 2. drum motor; 3. belt roller; 301. rotating shaft; 4. water tank; 5. load assembly; 501. rotating drum; 502. first gear; 503. jack; 504. movable paddle; 505. ball; 6. adjustment assembly; 601. connecting tube; 602. push rod; 603. threaded rod; 604. mounting seat; 605. groove; 606. first conductive ring; 607. second conductive ring; 608. push block; 609. rotating sleeve; 7. knob; 8. buffer assembly; 801. rotating rod; 802. second gear; 803. small paddle; 804. mounting frame; 805. movable block; 806. electromagnet. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] The present invention will be further described below with reference to the embodiments.

[0022] Example: Refer to Figures 1-10A device for testing the fatigue performance of a permanent magnet synchronous drum motor comprises a base 1 and a drum motor 2. A belt roller 3 and a water tank 4 are mounted on the base 1, positioned to one side of the drum motor 2. A rotating shaft 301 at one end of the belt roller 3 is rotatably mounted on the side wall of the water tank 4. The rotating shaft 301 extends into the water tank 4 and is fixedly connected to a load assembly 5. During testing, the drum motor 2 and belt roller 3 are connected by a belt. The belt roller 3 rotates with the drum motor 2, and the load assembly 5 also rotates with the belt roller 3. The load on the drum motor 2 can be adjusted by adjusting the load assembly 5.

[0023] Among them, the load component 5 includes a rotating drum 501, and a plurality of movable paddles 504 are inserted on the outer wall of the rotating drum 501. An adjustment component 6 is installed at the end of the water tank 4 away from the belt roller 3. The extension length of each movable paddle 504 is controlled by the adjustment component 6 to adjust the load on the drum motor 2.

[0024] When the movable paddle 504 extends from the rotating drum 501, the water in the water tank 4 creates a certain degree of resistance to the rotating movable paddle 504. Therefore, the load assembly 5, by pushing water through the water, creates a load force on the belt roller 3, which in turn acts as a load on the drum motor 2. This design not only changes the traditional method of attaching a load to the drum surface, preventing the load module from falling off and being thrown out, thus improving safety, but also, because the load assembly 5 is located in the water, the vibration generated is softer, which helps improve the testing environment.

[0025] Reference Figure 4-Figure 5 The movable paddle 504 is elastically inserted into the rotating drum 501. The end of the rotating drum 501 away from the rotating shaft 301 is provided with an insertion hole 503. The bottom end of the movable paddle 504 extends into the insertion hole 503 and is provided with an oblique opening. The adjusting assembly 6 includes a connecting tube 601 fixedly mounted on the outer wall of the water tank 4. A push rod 602 is inserted into the connecting tube 601 in the form of a piston pair. After the push rod 602 enters the socket 503, it pushes the movable paddle 504 outward through the oblique opening at the bottom end of the movable paddle 504.

[0026] Reference Figure 6 The adjustment assembly 6 also includes a knob 7. A threaded rod 603, which is screwed onto a push rod 602, is rotatably mounted within a connecting tube 601. The knob 7 is mounted at the end of the threaded rod 603. Turning the knob 7 rotates the threaded rod 603, causing the push rod 602 to move forward and backward. It should be noted that a protrusion is provided on the end of the push rod 602 near the knob 7, and a chute that mates with the protrusion is provided on the inner wall of the connecting tube 601. This prevents the push rod 602 from rotating. When the threaded rod 603 rotates, the push rod 602 moves forward or backward stably. This protrusion and chute also cooperate in the form of a piston pair to prevent water leakage from the water tank 4.

[0027] When the push rod 602 has not entered the socket 503, the movable paddle 504 is completely retracted into the rotating drum 501. During testing, the knob 7 can be turned to drive the threaded rod 603 to rotate, so that the push rod 602 enters the socket 503. As the push rod 602 gradually goes deeper, the bevel at the bottom end of the movable paddle 504 causes it to be pushed outward. The extended movable paddle 504 will be subjected to the resistance of the water body to form a load on the drum motor 2.

[0028] Multiple groups of movable paddles 504 are provided, each group having at least three movable paddles 504, and each group of movable paddles 504 is evenly spaced along the length of the rotating drum 501. Providing multiple groups of movable paddles 504 allows for a wider range of load adjustment. The greater the distance the ejector rod 602 extends, the more movable paddles 504 are ejected, resulting in a greater load value, thus expanding the scope of application and providing greater flexibility.

[0029] Reference Figure 4 The end of the push rod 602 away from the knob 7 is sleeved with a rotating sleeve 609.

[0030] Since the end of the push rod 602 first contacts the beveled opening at the bottom of the movable paddle 504 when it moves forward, and the rotating drum 501 is constantly rotating, the movable paddle 504 will form high-speed friction with the end of the push rod 602. Therefore, a rotating sleeve 609 is provided at the end of the push rod 602. If the movable paddle 504 generates significant friction with the rotating sleeve 609 during rotation, the rotating sleeve 609 will also rotate accordingly, without affecting the rotation of the movable paddle 504, that is, without affecting the normal rotation of the rotating drum 501, thereby minimizing interference with the load value. As can be seen from the above, in the present invention, the push rod 602 should be a smooth cylindrical body so that when inserted into the rotating drum 501, it will not affect the stable rotation of the rotating drum 501.

[0031] Further, refer to Figure 5 A ball 505 is mounted on the bottom end of each movable paddle 504. When the push rod 602 fully pushes the movable paddle 504 out, the outer surface of the push rod 602 contacts the ball 505. To further reduce the friction generated between the bottom end of the movable paddle 504 and the surface of the push rod 602, the ball 505 converts the sliding friction into roller friction, thereby reducing the obstruction to the rotation of the drum 501.

[0032] Reference Figure 7-10A buffer assembly 8 is also installed in the water tank 4, located below the load assembly 5. The buffer assembly 8 includes a rotating rod 801, with multiple small paddles 803 installed on the outer wall of the rotating rod 801. One end of the rotating rod 801 is mounted on a movable block 805 via a bearing. A mounting frame 804 is provided on the inner wall of the water tank 4 for the movable block 805 to move up and down. The rotating rod 801 can rotate, and when the movable block 805 moves up and down, it drives the rotating rod 801 to move simultaneously. The first gear 502 is installed on the rotating shaft 301, and the second gear 802 is installed on the rotating rod 801. The top of the mounting frame 804 is mounted with an electromagnet 806, and the top of the movable block 805 is mounted with a galvanized iron block. When the electromagnet 806 is energized, it attracts the movable block 805 to move upward, causing the first gear 502 and the second gear 802 to mesh.

[0033] Reference Figure 9 A groove 605 is provided on the inner wall of the connecting tube 601, and a first conductive ring piece 606 is installed at the opening of the groove 605. A second conductive ring piece 607 is attached to the inner wall of the groove 605. A mounting seat 604 is provided on the threaded rod 603, and a top block 608 is elastically inserted on the outer wall of the mounting seat 604. When the rotation speed of the threaded rod 603 exceeds a threshold, the top block 608 extends and squeezes the first conductive ring piece 606 and the second conductive ring piece 607 to fit together, so that the electromagnet 806 is energized.

[0034] Adjusting the load on the drum motor 2 requires turning knob 7. If the rotation speed of knob 7 exceeds a threshold (set by technicians based on actual testing requirements), the push rod 602 will extend too quickly, causing the movable paddle 504 to extend too quickly, disrupting the water balance in the water tank 4 and generating some vibration. Due to the excessive centrifugal force, the push block 608 will extend sufficiently, forcing the first conductive ring 606 and the second conductive ring 607 together and into contact with each other. This energizes the electromagnet 806, generating a magnetic force that pulls the movable block 805 upward, causing the second gear 802 to move upward and engage with the first gear 502. At this point, the rotating rod 801 will rotate with the rotating shaft 301, but in the opposite direction. The rotating rod 801 is also equipped with a small paddle 803, which rotates in the opposite direction to generate a driving force in the opposite direction of the water, thereby weakening the aforementioned vibration and further improving the stability of the device. Since the first conductive ring piece 606, the second conductive ring piece 607 and the electromagnet 806 are all fixedly arranged, their wiring and power supply methods are relatively simple and will not be described in detail here.

[0035] During the test, when the load assembly 5 starts to rotate, the movable paddle 504 extends, causing the water to move to a certain extent. To prevent water from splashing, a sealing cover is installed on the top of the water tank 4 to seal and block the water.

[0036] Reference Figure 1, both ends of the drum motor 2 are provided with mounting brackets, one of which is movable. When installing and removing the drum motor 2, one of the mounting brackets can be moved, which is fast and convenient.

[0037] Working Principle: When testing the fatigue performance of the drum motor 2, the drum motor 2 and the belt roller 3 are first connected via a belt. The belt roller 3 rotates with the drum motor 2, and the load assembly 5 also rotates with the belt roller 3. The load applied to the drum motor 2 can be adjusted by adjusting the load assembly 5. The extension length of each movable paddle 504 is controlled by the adjustment assembly 6 to adjust the load applied to the drum motor 2. When the movable paddle 504 extends above the rotating drum 501, the water in the water tank 4 creates a certain degree of resistance to the rotating movable paddle 504. Therefore, the load assembly 5, by pushing water through the water, creates a load force on the belt roller 3, i.e., the load applied to the drum motor 2. When the push rod 602 has not entered the insertion hole 503, the movable paddle 504 is completely retracted into the rotating drum 501. During testing, the knob 7 can be turned to drive the threaded rod 603 to rotate, so that the push rod 602 enters the insertion hole 503. As the push rod 602 gradually goes deeper, the bevel at the bottom end of the movable paddle 504 causes it to be pushed outward. The extended movable paddle 504 will be subjected to the resistance of the water body to form a load on the drum motor 2.

[0038] To adjust the load on the drum motor 2, knob 7 is rotated. If the knob 7 is rotated at a speed exceeding a threshold, the push rod 602 will extend too quickly, causing the movable paddle 504 to extend too quickly, disrupting the water balance in the water tank 4 and generating some vibration. Due to the excessive centrifugal force, the push block 608 will extend sufficiently, forcing the first conductive ring 606 and the second conductive ring 607 together and into contact with each other. This energizes the electromagnet 806, generating a magnetic force that attracts the movable block 805 upward, causing the second gear 802 to move upward and mesh with the first gear 502. At this point, the rotating rod 801 will rotate with the rotating shaft 301, but in the opposite direction. The rotating rod 801 is also provided with a small paddle 803, which rotates in the opposite direction to generate a driving force in the opposite direction of the water, thereby weakening the aforementioned vibration.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A testing device for fatigue performance of a permanent magnet synchronous drum motor, comprising a base (1) and a drum motor (2), characterized in that: The base (1) is also provided with a belt roller (3) and a water tank (4) located on one side of the drum motor (2); a rotating shaft (301) at one end of the belt roller (3) is rotatably inserted into a side wall of the water tank (4); and the rotating shaft (301) extends into the water tank (4) and is fixedly connected to a load component (5); The load assembly (5) comprises a rotating drum (501), a plurality of movable paddles (504) are inserted on the outer wall of the rotating drum (501), and an adjustment assembly (6) is installed at one end of the water tank (4) away from the belt roller (3), and the extension length of each movable paddle (504) is controlled by the adjustment assembly (6) to adjust the load on the drum motor (2).

2. A testing device for fatigue performance of a permanent magnet synchronous drum motor according to claim 1, characterized in that: The movable paddle (504) is elastically inserted on the rotating drum (501); an insertion hole (503) is provided at one end of the rotating drum (501) away from the rotating shaft (301); the bottom end of the movable paddle (504) extends into the insertion hole (503) and is provided with an oblique opening; The regulating assembly (6) comprises a connecting tube (601) fixedly mounted on the outer wall of the water tank (4), wherein a push rod (602) is inserted into the connecting tube (601) in the form of a piston pair, and after the push rod (602) enters the insertion hole (503), it pushes the movable paddle (504) outward through the oblique opening at the bottom end of the movable paddle (504).

3. A testing device for fatigue performance of a permanent magnet synchronous drum motor according to claim 2, characterized in that: The movable paddles (504) are provided in a plurality of groups, each group of movable paddles (504) is provided with at least three movable paddles, and each group of movable paddles (504) is distributed at equal distances along the length direction of the rotating drum (501).

4. A testing device for fatigue performance of a permanent magnet synchronous drum motor according to claim 2, characterized in that: The adjustment assembly (6) further comprises a knob (7). A threaded rod (603) which is screwed onto the push rod (602) is rotatably mounted in the connection tube (601). The knob (7) is mounted at the end of the threaded rod (603). The threaded rod (603) is rotated by rotating the knob (7) so that the push rod (602) moves forward and backward.

5. A testing device for fatigue performance of a permanent magnet synchronous drum motor according to claim 4, characterized in that: One end of the push rod (602) away from the knob (7) is sleeved with a rotating sleeve (609).

6. A testing device for fatigue performance of a permanent magnet synchronous drum motor according to claim 5, characterized in that: A ball (505) is mounted on the bottom end of each movable paddle (504).

7. A testing device for fatigue performance of a permanent magnet synchronous drum motor according to claim 4, characterized in that: A buffer assembly (8) located below the load assembly (5) is also installed in the water tank (4). The buffer assembly (8) comprises a rotating rod (801). A plurality of small paddles (803) are installed on the outer wall of the rotating rod (801). One end of the rotating rod (801) is installed on a movable block (805) via a bearing. A mounting frame (804) for the movable block (805) to move up and down is provided on the inner wall of the water tank (4). A first gear (502) is installed on the rotating shaft (301). A second gear (802) is installed on the rotating rod (801). An electromagnet (806) is installed on the top of the mounting frame (804). A galvanized iron block is installed on the top of the movable block (805). When the electromagnet (806) is energized, it attracts the movable block (805) to move upward so that the first gear (502) and the second gear (802) are meshed.

8. The testing device for fatigue performance of permanent magnet synchronous drum motor according to claim 7, characterized in that: The inner wall of the connecting tube (601) is provided with a groove (605), a first conductive ring piece (606) is installed at the opening of the groove (605), a second conductive ring piece (607) is attached to the inner wall of the groove (605), a mounting seat (604) is provided on the threaded rod (603), a top block (608) is elastically inserted on the outer wall of the mounting seat (604), and when the rotation speed of the threaded rod (603) exceeds a threshold value, the top block (608) extends out and squeezes the first conductive ring piece (606) and the second conductive ring piece (607) to fit together, so that the electromagnet (806) is energized.

9. The testing device for fatigue performance of permanent magnet synchronous drum motor according to claim 1, characterized in that: A sealing cover is installed on the top of the water tank (4).

10. The testing device for fatigue performance of permanent magnet synchronous drum motor according to claim 1, characterized in that: Both ends of the drum motor (2) are provided with mounting brackets, one of which is movably arranged.

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