A testing device for fatigue performance of permanent magnet synchronous drum motor

Abstract

The present invention relates to the field of motor testing technology, and specifically to a testing device for fatigue performance of a permanent magnet synchronous drum motor, comprising a base and a drum motor, wherein a belt roller and a water tank located on one side of the drum motor are also installed on the base, wherein a rotating shaft at one end of the belt roller is rotatably inserted on the side wall of the water tank, and the rotating shaft extends into the water tank and is fixedly connected with a load component; the load component comprises a rotating drum, wherein a plurality of movable paddles are inserted on the outer wall of the rotating drum, and an adjusting component is installed at one end of the water tank away from the belt roller. The present invention connects the drum motor with the belt roller, and the belt roller with the load component, and places the load component in a sealed water tank, and generates a load by rotating the movable paddle to pry water, so that not only will the load component not fall off, but the vibration generated is also greatly reduced by the weakening of the water body, thereby increasing the safety factor and improving the testing environment.

Description

Technical Field

[0001] The 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] The drum motor fatigue test is a test of the drum motor (usually used in transmission, conveying, and transportation systems, etc.) under simulated use conditions for long-term working conditions. The purpose is to evaluate its performance, durability, and reliability under repeated loads, vibrations, temperature changes, etc. Through fatigue testing, the possible failure modes of the motor in long-term operation can be discovered, and its service life can be predicted, thus 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 table, a plurality of groups of support frames distributed in pairs are fixedly installed on the top of the support table, a fixing device is arranged between each group of the support frames, a movable device is installed on the top of the support table, 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 table.

[0004] At present, as described in the above patent, when the drum motor is load tested, 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, which significantly increases the risk factor in this process. And when the drum motor just 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 greater vibrations, generate greater noise, and have 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:

[0007] A testing device for fatigue performance of a permanent magnet synchronous drum motor comprises a base and a drum motor, wherein a belt roller and a water tank located on one side of the drum motor are mounted on the base, a rotating shaft at one end of the belt roller is rotatably inserted on the side wall of the water tank, and the rotating shaft extends into the water tank and is fixedly connected to a load component;

[0008] The load component includes a rotating drum, a plurality of movable paddles are inserted on the outer wall of the rotating drum, and an adjustment component is installed at 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.

[0009] In the above-mentioned testing device for fatigue performance of permanent magnet synchronous drum motor, the movable paddle is elastically inserted on the rotating drum, an insertion hole is provided at one end of the rotating drum away from the rotating shaft, and the bottom end of the movable paddle extends into the insertion hole and is provided with an oblique opening;

[0010] The regulating assembly comprises 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, and 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.

[0011] 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 movable paddles, and each group of movable paddles is distributed at equal distances along the length direction of the drum.

[0012] In the above-mentioned testing device for fatigue performance of permanent magnet synchronous drum motor, the adjustment assembly also includes a knob, a threaded rod screwed on the top rod is rotatably installed in the connecting tube, and the knob is installed at the end of the threaded rod. The threaded rod is rotated by turning the knob to make the top rod move forward and backward.

[0013] In the above-mentioned testing device for fatigue performance of permanent magnet synchronous drum motor, one end of the push rod away from the knob is sleeved with a rotating sleeve.

[0014] 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.

[0015] 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 an installation 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 installation 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.

[0016] In the above-mentioned testing device for fatigue performance of permanent magnet synchronous drum motor, a groove is opened 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, a top block is elastically inserted on the outer wall of the mounting seat, and when the rotation speed of the threaded rod exceeds a threshold value, the top block extends out and squeezes the first conductive ring piece and the second conductive ring piece to fit together so that the electromagnet is energized.

[0017] 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.

[0018] 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.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention connects the drum motor with the belt roller, which is connected with the load component, and places the load component in a sealed water tank. The load is generated by rotating the movable paddle to pry water. Not only does the load component not fall off, but the vibration generated is also greatly reduced by the weakening of the water body, thereby increasing the safety factor and improving the test environment.

[0021] An adjustment component and multiple groups of movable paddles are provided. The number of movable paddles extended can be changed by adjusting the length of the extended top rod, thereby adjusting the load size. The application range is wide and the flexibility of the equipment is improved.

[0022] 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 out 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, so that the electromagnet is energized, driving the movable block to move upward, the first gear and the second gear are meshed, and the rotating drum will drive the rotating rod to rotate. The small paddle on it rotates in the opposite direction to the movable paddle, 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

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is the left schematic diagram of the present invention;

[0026] Figure 3 A top view of the present invention;

[0027] Figure 4 It is a schematic diagram of the cooperation between the load assembly and the ejector rod of the present invention;

[0028] Figure 5 It is a schematic diagram of the bottom structure of the load assembly of the present invention;

[0029] Figure 6 for Figure 2 A partial cross-sectional view of AA in FIG.

[0030] Figure 7 It is a front schematic diagram of the internal structure of the water tank of the present invention;

[0031] Figure 8 It is a schematic diagram of the cooperation between the load component and the buffer component of the present invention;

[0032] Fig. 9 for Figure 6 A magnified view of the structure at B in FIG.

[0033] Fig.10 for Figure 8 A magnified view of the structure at position C in FIG.

[0034] The numbers in the figure represent: 1. base; 2. drum motor; 3. belt roller; 301. shaft; 4. water tank; 5. load assembly; 501. 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 piece; 607. second conductive ring piece; 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

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0036] The present invention will be further described below in conjunction with the embodiments.

[0037] Example: Refer to Figure 1-Figure 10 A testing device for 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 and are 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 the side wall of the water tank 4. The rotating shaft 301 extends into the water tank 4 and is fixedly connected with a load component 5. During the test, the drum motor 2 and the belt roller 3 are connected by a belt, the belt roller 3 rotates with the drum motor 2, and the load component 5 rotates with the belt roller 3. The load on the drum motor 2 can be achieved by adjusting the load component 5.

[0038] 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 one 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.

[0039] When the movable paddle 504 extends out from the drum 501, the water in the water tank 4 will generate a certain degree of resistance to the rotating movable paddle 504, so the load assembly 5 forms a load force on the belt roller 3 by pushing water in the water, that is, the load on the drum motor 2. This design not only changes the original traditional way of adding a load on the drum surface, avoiding the load module from falling off and being thrown out, and improving safety, but also because the load assembly 5 is located in the water, the vibration generated is also softer, which helps to improve the test environment.

[0040] Reference Figure 4-Figure 5 The movable paddle 504 is elastically inserted on the rotating drum 501. The end of the rotating drum 501 away from the rotating shaft 301 is provided with a plug hole 503. The bottom end of the movable paddle 504 extends into the plug hole 503 and is provided with an oblique opening.

[0041] The adjustment component 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 insertion hole 503, it pushes the movable paddle 504 outward through the oblique opening at the bottom end of the movable paddle 504.

[0042] Reference Figure 6 The adjustment assembly 6 also includes a knob 7. A threaded rod 603 screwed on the top rod 602 is rotatably installed in the connecting tube 601. The knob 7 is installed at the end of the threaded rod 603. The threaded rod 603 is rotated by rotating the knob 7 to make the top rod 602 move forward and backward. It should be noted that a protrusion should be provided at one end of the top rod 602 close to the knob 7, and a slide groove adapted to the protrusion is provided on the inner wall of the connecting tube 601, so that the top rod 602 cannot rotate. When the threaded rod 603 rotates, the top rod 602 will move forward or backward stably. The protrusion and the slide groove are also matched in the form of a piston pair to prevent water leakage inside the water tank 4.

[0043] When the push rod 602 has not entered the insertion hole 503, the movable paddle 504 is completely retracted into the rotating drum 501. When 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.

[0044] There are multiple groups of movable paddles 504, each group of movable paddles 504 is provided with at least three, and each group of movable paddles 504 is equidistantly distributed along the length direction of the rotating drum 501. Providing multiple groups of movable paddles 504 can make the load value adjustment range larger, the greater the distance the push rod 602 extends, the more movable paddles 504 are pushed out, and the greater the load value formed, which increases the scope of application and is more flexible.

[0045] Reference Figure 4 The end of the push rod 602 away from the knob 7 is sleeved with a rotating sleeve 609.

[0046] Since the end of the top rod 602 first contacts the oblique opening at the bottom of the movable paddle 504 when it moves forward, and the drum 501 is always rotating, the movable paddle 504 will form high-speed friction with the end of the top rod 602. Therefore, a rotating sleeve 609 is set at the end of the top rod 602. If the movable paddle 504 generates greater friction with the rotating sleeve 609 when rotating, the rotating sleeve 609 will also rotate with it, which will not affect the rotation of the movable paddle 504, that is, it will not affect the normal rotation of the drum 501, and the interference with the load value is minimized. It can also be clear from the above that in the present invention, the top rod 602 should be a cylinder with a smooth surface, so that it will not affect the stable rotation of the drum 501 when inserted into the drum 501.

[0047] Further, refer to Figure 5A ball 505 is installed at the bottom end of each movable paddle 504. When the push rod 602 completely pushes the movable paddle 504 out, the outer surface of the push rod 602 contacts the ball 505. In order 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.

[0048] Reference Figure 7-10 , a buffer assembly 8 located below the load assembly 5 is also installed in the water tank 4. The buffer assembly 8 includes 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 the movable block 805 through 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. The rotating rod 801 can rotate, and the movable block 805 will drive the rotating rod 801 to move simultaneously when it moves up and down. 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, and 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 up so that the first gear 502 and the second gear 802 are engaged.

[0049] Reference Fig. 9 A groove 605 is provided on the inner wall of the connecting tube 601, 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, 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.

[0050] When adjusting the load on the drum motor 2, it is necessary to rotate the knob 7. If the rotation speed of the knob 7 exceeds a threshold value (the threshold value is set by the technician according to the actual test requirements), the top rod 602 will extend too fast, causing the movable paddle 504 to extend too fast, which will break the water balance in the water tank 4 and generate certain vibrations. The top block 608 will extend a sufficient length due to the excessive centrifugal force, and the first conductive ring piece 606 and the second conductive ring piece 607 will be squeezed together by the top block 608 to fit each other, so that the electromagnet 806 is energized, and the magnetic force generated will attract the movable block 805 upward, and the second gear 802 will move up and mesh with the first gear 502. At this time, the rotating rod 801 will rotate with the rotating shaft 301, but in the opposite direction. A small paddle 803 is also provided on the rotating rod 801. The small paddle 803 rotates in the opposite direction to generate a driving force in the opposite direction of the water body, thereby weakening the above-mentioned vibration force, which can further improve 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.

[0051] During the test, when the load assembly 5 starts to rotate, the movable paddle 504 extends out, 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.

[0052] Reference Figure 1 Both ends of the drum motor 2 are provided with mounting brackets, one of which is movably arranged. When installing and removing the drum motor 2, one of the mounting brackets can be moved, which is fast and convenient.

[0053] Working principle: When testing the fatigue performance of the drum motor 2, the drum motor 2 and the belt roller 3 are first connected by a belt, and the belt roller 3 rotates with the drum motor 2, and the load component 5 rotates with the belt roller 3. The load on the drum motor 2 can be achieved by adjusting the load component 5. The extension length of each movable paddle 504 is controlled by the adjustment component 6 to adjust the load on the drum motor 2. When the movable paddle 504 is extended on the rotating drum 501, the water in the water tank 4 will produce a certain degree of resistance to the rotating movable paddle 504, so the load component 5 forms a load force on the belt roller 3 by pushing water in the water, that is, the load on 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 subject to the resistance of the water body to form a load on the drum motor 2.

[0054] When adjusting the load on the drum motor 2, it is necessary to rotate the knob 7. If the rotation speed of the knob 7 exceeds the threshold, the top rod 602 will extend too fast, causing the movable paddle 504 to extend too fast, which will break the water balance in the water tank 4 and generate certain vibrations. The top block 608 will extend a sufficient length due to the excessive centrifugal force, and the first conductive ring piece 606 and the second conductive ring piece 607 will be squeezed together by the top block 608 to fit each other, so that the electromagnet 806 is energized, and the magnetic force generated will attract the movable block 805 upward, and the second gear 802 will move up and mesh with the first gear 502. At this time, 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, and the small paddle 803 rotates in the opposite direction to generate a driving force in the opposite direction of the water body, thereby weakening the above-mentioned vibration force.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. 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 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: A belt roller (3) and a water tank (4) are also mounted on the base (1), and are located on one side of the drum motor (2); the drum motor (2) and the belt roller (3) are connected via a belt; 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 component (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 component (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 component (6) to adjust the load on the drum motor (2); 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), a push rod (602) being inserted into the connecting tube (601) in the form of a piston pair, and the push rod (602) pushes the movable paddle (504) outward through the oblique opening at the bottom end of the movable paddle (504) after entering the insertion hole (503); 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); The adjusting assembly (6) further comprises a knob (7); a threaded rod (603) which is screwed onto the push rod (602) is rotatably mounted in the connecting tube (601); the knob (7) is mounted at the end of the threaded rod (603); and the threaded rod (603) is rotated by rotating the knob (7) so that the push rod (602) moves forward and backward. A buffer assembly (8) located below the load assembly (5) is also installed in the water tank (4), the buffer assembly (8) comprising a rotating rod (801), a plurality of small paddles (803) being installed on the outer wall of the rotating rod (801), one end of the rotating rod (801) being 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), and 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; 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.

2. A testing device for fatigue performance of a permanent magnet synchronous drum motor according to claim 1, characterized in that: One end of the push rod (602) away from the knob (7) is sleeved with a rotating sleeve (609).

3. A testing device for fatigue performance of a permanent magnet synchronous drum motor according to claim 2, characterized in that: A ball (505) is mounted on the bottom end of each movable paddle (504).

4. A testing device for fatigue performance of a 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).

5. 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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