A dynamometer for an electric motor

Abstract

The utility model relates to motor detection field discloses a motor dynamometer device. Its including frame and setting dynamometer subassembly on frame, still fixedly installed with support frame on the frame, be provided with bearing sleeve on the support frame, rotate and connect with bearing in bearing sleeve, drive shaft is arranged in bearing, drive shaft is connected with dynamometer subassembly on the frame, be provided with support ring on bearing sleeve, be provided with four jaw chuck on the support ring, set up bolt hole and connecting hole on four jaw chuck, the bolt that sets up in bolt hole fixes four jaw chuck on support ring, the bolt sets up in the mounting hole on the shell of measured motor and connecting hole, fix motor on four jaw chuck. The utility model has reduced the damage to bearing, realized the effect that saves time, improves efficiency avoids damaging equipment, improves test precision.

Description

Technical Field

[0001] This utility model relates to the technical field of motor testing, and more specifically, to a motor dynamometer device. Background Technology

[0002] With the increasingly widespread application of electric motors, their performance requirements are indeed becoming more stringent. After the motor is manufactured, comprehensive testing of its parameters and performance is crucial, with the rotation test of the motor spindle being particularly critical. This test not only helps verify the motor's design performance but also allows for the determination of its ultimate load capacity by adding a load, thereby ensuring the motor's reliability and stability in practical applications. For example, the motor in a refrigerator needs to be tested by simulating its assembly with the refrigerator compressor.

[0003] In existing technologies, refrigerator motor testing typically involves using a fixture to hold the motor housing. Since the fixture is coaxial with the drive shaft, after the rotor of the motor under test is connected to the drive shaft of the testing device, the fixture clamps and secures the motor housing. The testing device then drives the drive shaft to rotate and perform relevant tests on the motor. However, existing motors are not uniformly circumferentially distributed, which can easily cause the motor housing to tilt during clamping, making it difficult for the rotor and drive shaft to remain concentric. This necessitates using shims in different locations to align the motor center with the fixture center, a time-consuming and difficult operation. Furthermore, refrigerator motor rotor shaft holes come in various types, requiring the replacement of the rotating shaft when testing different motor rotors. This operation is also time-consuming and can easily damage bearings, affecting the accuracy of the measurement data. Summary of the Invention

[0004] To address at least one of the aforementioned problems, this utility model provides a motor dynamometer.

[0005] Optionally, the device includes a frame and a dynamometer assembly mounted on the frame. A support frame is also fixedly mounted on the frame, and a bearing sleeve is provided on the support frame. A bearing is rotatably connected inside the bearing sleeve, and a drive shaft passes through the bearing. The drive shaft is connected to the dynamometer assembly on the frame. A support ring is provided on the bearing sleeve, and a four-jaw chuck is provided on the support ring. The four-jaw chuck has bolt holes and connection holes. Bolts passing through the bolt holes fix the four-jaw chuck to the support ring. The bolts pass through the mounting holes and connection holes on the housing of the motor being tested, thus fixing the motor to the four-jaw chuck.

[0006] Optionally, the four-jaw chuck includes a mounting part and a connecting part, the bolt hole is formed on the mounting part, the connecting hole is formed on the connecting part, both the bolt hole and the connecting hole are threaded holes, and the mounting part is a ring structure.

[0007] Optionally, the drive shaft includes a first shoulder and a second shoulder, the diameter of the first shoulder being smaller than the diameter of the second shoulder, the first shoulder passing through the rotor of the motor under test, and the second shoulder being disposed in the bearing sleeve and connected to the bearing.

[0008] Optionally, a variable diameter sleeve is fitted on the first shoulder of the drive shaft, and a fixing component is provided on the first shoulder, the fixing component being used to abut one end of the variable diameter sleeve against the end face of the second shoulder.

[0009] Optionally, the fixing assembly includes a threaded rod threadedly connected to the end face of the first shaft shoulder and a push rod fixed to the threaded rod. The push rod is provided with a push surface, which is set as an inclined surface and abuts against the inner wall of the reducing sleeve.

[0010] Optionally, the variable diameter sleeve is provided with a plurality of first relief grooves and a plurality of second relief grooves, the plurality of first relief grooves and second relief grooves being arranged along the circumference of the variable diameter sleeve, and the first relief grooves and second relief grooves being staggered.

[0011] Optionally, the bolt holes on the mounting part are countersunk holes, and the bolts that fix the four-jaw chuck to the mounting ring are also countersunk bolts.

[0012] Optionally, the bearing sleeve is provided with a front end cover and a rear end cover, both of which are mounted on the drive shaft and are fixed to the bearing sleeve by bolts.

[0013] Compared with the prior art, the beneficial technical effects of this utility model are as follows: 1. When installing motors with different mounting hole spacings, only the outermost four-jaw toothed plate of the fixture needs to be replaced, thus simplifying the overall tooling structure and making operation convenient; 2. When connecting rotors with different inner diameters, there is no need to replace them; a reducing sleeve can solve the problem directly. This reduces the number of crankshaft replacements, minimizes damage to bearings, saves time, improves efficiency, avoids equipment damage, and enhances testing accuracy. Attached Figure Description

[0014] Figure 1 This is an overall structural diagram of an embodiment of the present utility model; Figure 2 This is a structural diagram of the drive shaft in an embodiment of the present utility model; Figure 3 This is a cross-sectional view of the bearing sleeve in an embodiment of this utility model; Figure 4 This is a schematic diagram of the installation of the four-claw toothed plate and the support ring in an embodiment of this utility model; Figure 5 This is a schematic diagram of the support ring and mounting ring structure in an embodiment of the present utility model; Figure 6 This is a structural diagram of the front cover in an embodiment of the present utility model; Figure 7 This is a structural diagram of the rear cover in an embodiment of the present utility model; Figure 8 This is a structural diagram of a four-jaw toothed chuck in one embodiment of the present utility model; Figure 9 This is another model of four-claw toothed disc structure in this utility model embodiment. Figure 3 ; Figure 10 This is a schematic diagram of the fixing component structure in an embodiment of the present utility model; Figure 11 This is a schematic diagram of the drive shaft structure in an embodiment of the present utility model; Figure 12 This is a schematic diagram of the variable diameter sleeve structure in an embodiment of this utility model.

[0015] Explanation of reference numerals in the attached drawings: 01, Motor under test; 1, Frame; 11, Dynamometer assembly; 12, Support frame; 13, Bearing sleeve; 14, Front end cover; 15, Rear end cover; 16, Mounting ring; 17, Support ring; 2, Drive shaft; 21, First shoulder; 22, Second shoulder; 3, Variable diameter sleeve; 31, First clearance groove; 32, Second clearance groove; 4, Four-jaw chuck; 41, Mounting part; 42, Connecting part; 5, Bolt hole; 51, Connecting hole; 6, Fixing assembly; 61, Threaded rod; 62, Push rod; 63, Pushing surface; 64, Rectangular block. Detailed Implementation

[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the following description is provided in conjunction with the appendix. Figure 1-12 This application will be described in further detail.

[0017] This utility model embodiment provides a motor dynamometer, referring to... Figure 1 A motor dynamometer includes a frame 1 and dynamometer components 11 mounted on the frame 1. Multiple dynamometer components 11 can be mounted on the frame 1, and each dynamometer component 11 can test one motor 01 under test. In this embodiment, two dynamometer components 11 are mounted on the frame 1.

[0018] A support frame 12 is also fixedly installed on the frame 1. A bearing sleeve 13 is provided on the support frame 12. A bearing is rotatably connected inside the bearing sleeve 13. A drive shaft 2 passes through the bearing. The drive shaft 2 is connected to the dynamometer assembly 11 on the frame 1. The drive shaft 2 is driven to rotate through the dynamometer assembly 11.

[0019] A front cover 14 and a rear cover 15 are provided on the bearing sleeve 13. Both the front cover 14 and the rear cover 15 are mounted on the drive shaft 2 and are fixed to the bearing sleeve 13 by bolts. A support ring 17 is provided on the bearing sleeve 13, and a mounting ring 16 is provided on the support ring 17. The mounting ring 16 has bolt holes 5 and is fixed to the bearing sleeve 13 by bolts. In this embodiment, the outer diameter of the bearing sleeve 13 is 116 mm, the outer diameter of the front cover 14 is 94 mm, the outer diameter of the rear cover 15 is 94 mm, the outer diameter of the support ring 17 is 140 mm, and the inner diameter is 120 mm. A four-jaw chuck 4 is provided on the support ring 17. The four-jaw chuck 4 is used to fix the housing of the motor 01 under test. Bolt holes 5 are provided on the four-jaw chuck 4. The four-jaw chuck 4 is fixed to the support ring 17 by bolts. Since the four-jaw chuck 4 is fixed to the support ring 17 by bolts, it is convenient to install and remove the four-jaw chuck 4.

[0020] The four-jaw toothed chuck 4 includes a mounting part 41 and a connecting part 42. The mounting part 41 has bolt holes 5, and the connecting part 42 has connecting holes 51. Both the bolt holes 5 and the connecting holes 51 are threaded holes. The mounting part 41 has an annular structure. When fixing different tested motors 01, the four-jaw toothed chuck 4 on the mounting ring 16 needs to be replaced so that the connecting holes 51 on the mounting part 41 correspond to the mounting holes on the housings of different tested motors 01. In this embodiment, four bolt holes 5 and four connecting holes 51 are provided, and these four bolt holes 5 and four connecting holes 51 are spaced apart circumferentially along the four-jaw toothed chuck 4. The diameter of the circle containing the center of the four bolt holes 5 is 130mm, and the diameter of the connecting holes 51 is M5.

[0021] When testing different motors, different four-jaw chucks 4 need to be replaced. At this time, different four-jaw chucks 4 need to be fixed to the mounting ring 16 with bolts. Then, the outer diameter of the mounting part 41 on different four-jaw chucks 4 is the same. In this embodiment, the outer diameter of the mounting part 41 on all four-jaw chucks 4 is 140mm. The position of the connecting part 42 on different four-jaw chucks 4 is different. For example, the distance between adjacent connecting holes 51 on the connecting part 42 is 82mm or 78mm. The larger the distance between two adjacent connecting holes 51, the larger the inner diameter of the four-jaw chuck 4. When the distance between adjacent connecting holes 51 is 82mm, the inner diameter of the four-jaw chuck 4 is 120mm. When the distance between adjacent connecting holes 51 is 78mm, the inner diameter of the four-jaw chuck 4 is 105mm.

[0022] The bolt holes 5 on the mounting part 41 are countersunk holes, and the bolts that fix the four-jaw chuck 4 to the mounting ring 16 are also countersunk bolts. By setting the countersunk holes, the obstruction of the bolts to the motor housing is reduced, thereby facilitating the installation of the motor 01 under test.

[0023] During the actual installation process, the staff selects the appropriate size four-jaw toothed plate 4 according to the model of the motor 01 under test, so that the mounting holes on the housing of the motor 01 under test correspond to the connecting holes 51 on the connecting part 42. Then, the motor 01 under test is fixed to the connecting part 42 with bolts. Since the mounting part 41 is fixed to the connecting part 42, the motor can be fixed at this time.

[0024] The drive shaft 2 includes a first shoulder 21 and a second shoulder 22. The diameter of the first shoulder 21 is smaller than the diameter of the second shoulder 22. The first shoulder 21 passes through the rotor of the motor 01 under test, and the second shoulder 22 is located inside the bearing sleeve 13 and connected to the bearing. A variable diameter sleeve 3 is fitted on the first shoulder 21 of the drive shaft 2. At the same time, a fixing component 6 is provided on the first shoulder 21. The fixing component 6 is used to abut one end of the variable diameter sleeve 3 against the end face of the second shoulder 22. Since the variable diameter sleeve 3 needs to pass through the rotor, when the drive shaft 2 is connected to rotors with different inner diameters, different variable diameter sleeves 3 can be selected and installed on the first shoulder 21, and then fixed by the fixing component 6. Finally, it can be connected to rotors with different inner diameters.

[0025] The fixing assembly 6 includes a threaded rod 61 threadedly connected to the end face of the first shoulder 21 and a push rod 62 fixed to the threaded rod 61. A push surface 63 is provided on the push rod 62, which abuts against the inner wall of the reducing sleeve 3. In this embodiment, the push surface 63 is an inclined surface. Under the action of the push surface 63, the push rod 62 forms an inverted frustum structure, and its vertical cross-section gradually increases in the direction away from the reducing sleeve 3. When fixing the reducing sleeve 3, one end of the reducing sleeve 3 abuts against the end face of the second shoulder 22, and the other end abuts against the push surface 63. By setting the inclined push surface 63, reducing sleeves 3 with different inner diameters can be fixed, thereby connecting rotors with different inner diameters. The outer diameter of the reducing sleeve 3 can be 17.97mm or 19.02mm, 15.94mm, or 17.94mm, and the inner diameter is 15.9mm, allowing the reducing sleeve 3 to be fitted onto the first shoulder 21.

[0026] Multiple first clearance grooves 31 and multiple second clearance grooves 32 are provided on the reducing sleeve 3. The multiple first clearance grooves 31 and second clearance grooves 32 are arranged circumferentially along the reducing sleeve 3. The first clearance grooves 31 and second clearance grooves 32 are staggered. When the rotor of the motor 01 under test is sleeved on the reducing sleeve 3, the operator rotates the push rod 62. The threaded rod 61 on the push rod 62 moves inward, and then the push surface 63 will open the reducing sleeve 3, so that the outer diameter of the opened reducing sleeve 3 abuts against the inner diameter of the rotor, thereby fixing the rotor. In order to facilitate the rotation of the push rod 62, a rectangular block 64 is fixedly installed on the end face of the push rod 62. The rectangular block 64 makes it easy for the operator to rotate the push rod 62 and the threaded rod 61.

[0027] The implementation principle (usage process, installation process) of a motor dynamometer device according to this application embodiment is as follows: When testing different motors 01, the operator selects the corresponding variable diameter sleeve 3 and four-jaw chuck 4 according to the motor model. The four-jaw chuck 4 is fixed on the mounting ring 16 with countersunk bolts. Then, the rotor is fitted onto the drive shaft 2. Since the variable diameter sleeve 3 is fitted on the drive shaft 2, the variable diameter sleeve 3 will be inside the rotor. By moving the threaded rod 61 and the push rod 62 on the drive shaft 2, the variable diameter sleeve 3 is opened. The opened variable diameter sleeve 3 abuts against the inner diameter surface of the rotor, thereby fixing the rotor position. Since the center of the mounting hole on the housing of the motor 01 is coaxial with the rotor, the mounting hole on the housing of the motor 01 can be aligned with the connecting hole 51. Finally, the bolts fix the housing of the motor 01 to the four-jaw chuck 4, thereby fixing the motor 01.

[0028] Compared with existing technologies, when installing motors 01 with different mounting hole spacings, only the outermost four-jaw toothed plate 4 of the fixture needs to be replaced; when connecting rotors with different inner diameters, there is no need to replace them, as the diameter-changing sleeve 3 can be used directly, thereby reducing the number of crankshaft replacements, reducing damage to bearings, saving time, improving efficiency, avoiding damage to equipment, and improving testing accuracy; and simplifying the overall tooling structure.

[0029] Similarly, the components included in the "components," "mechanisms," and "devices" of this disclosure can also be flexibly combined. They can be modularly produced according to actual needs and assembled as an independent module; or they can be assembled separately to form a module in this device. The division of the above-mentioned components in this disclosure is only one embodiment for ease of reading and is not intended to limit the scope of protection of this disclosure. Any technical solution that includes the above-mentioned components and has the same function should be understood as an equivalent technical solution of this disclosure.

[0030] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0031] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0033] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that when a component is referred to as "fixed to," "set on," "fixed to," or "mounted on" another component, it can be directly on the other component or there may be an intervening component. When a component is considered to be "connected to another component," it can be directly connected to the other component or there may be an intervening component. Furthermore, when a component is considered to be "fixedly connected" to another component, the connection can be detachable or non-detachable, such as through socketing, snap-fitting, integral molding, welding, etc., which are achievable in conventional technologies and will not be elaborated upon here.

[0035] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The above embodiments are merely illustrative of several implementation methods of this disclosure, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of this disclosure, and these modifications and improvements all fall within the protection scope of this disclosure.

Claims

1. A motor dynamometer, characterized in that: The device includes a frame (1) and a dynamometer assembly (11) mounted on the frame (1). A support frame (12) is also fixedly mounted on the frame (1). A bearing sleeve (13) is mounted on the support frame (12). A bearing is rotatably connected inside the bearing sleeve (13). A drive shaft (2) passes through the bearing. The drive shaft (2) is connected to the dynamometer assembly (11) on the frame (1). A support ring (17) is mounted on the bearing sleeve (13). A four-jaw chuck (4) is mounted on the support ring (17). A bolt hole (5) and a connection hole (51) are provided on the four-jaw chuck (4). A bolt passes through the bolt hole (5) to fix the four-jaw chuck (4) to the support ring (17). The bolt passes through the mounting hole and the connection hole (51) on the housing of the motor (01) being tested to fix the motor on the four-jaw chuck (4).

2. The motor dynamometer according to claim 1, characterized in that: The four-jaw toothed sprocket (4) includes a mounting part (41) and a connecting part (42). The bolt hole (5) is opened on the mounting part (41), and the connecting hole (51) is opened on the connecting part (42). Both the bolt hole (5) and the connecting hole (51) are threaded holes. The mounting part (41) is a ring structure.

3. A motor dynamometer according to claim 1 or 2, characterized in that: The drive shaft (2) includes a first shoulder (21) and a second shoulder (22). The diameter of the first shoulder (21) is smaller than the diameter of the second shoulder (22). The first shoulder (21) passes through the rotor of the motor (01) under test, and the second shoulder (22) is located in the bearing sleeve (13) and connected to the bearing.

4. The motor dynamometer according to claim 3, characterized in that: A variable diameter sleeve (3) is fitted on the first shoulder (21) of the drive shaft (2). A fixing component (6) is provided on the first shoulder (21). The fixing component (6) is used to abut one end of the variable diameter sleeve (3) against the end face of the second shoulder (22).

5. The motor dynamometer according to claim 4, characterized in that: The fixing component (6) includes a threaded rod (61) threaded to the end face of the first shoulder (21) and a push rod (62) fixed on the threaded rod (61). The push rod (62) is provided with a push surface (63), which is set as an inclined surface and abuts against the inner wall of the variable diameter sleeve (3).

6. The motor dynamometer according to claim 5, characterized in that: The variable diameter sleeve (3) is provided with a plurality of first relief grooves (31) and a plurality of second relief grooves (32). The plurality of first relief grooves (31) and second relief grooves (32) are arranged circumferentially along the variable diameter sleeve (3), and the first relief grooves (31) and second relief grooves (32) are staggered.

7. The motor dynamometer according to claim 2, characterized in that: The bolt holes (5) on the mounting part (41) are countersunk holes, and the bolts that fix the four-jaw toothed plate (4) on the mounting ring (16) are also countersunk bolts.

8. The motor dynamometer according to claim 1, characterized in that: The bearing sleeve (13) is provided with a front cover (14) and a rear cover (15). The front cover (14) and the rear cover (15) are both mounted on the drive shaft (2), and the front cover (14) and the rear cover (15) are both fixed to the bearing sleeve (13) by bolts.

Images