Load testing device and load testing equipment for motor

Abstract

The utility model discloses a load testing device and load testing equipment of a motor, the load testing device comprises a supporting device, a clamping device, a load assembly and a driving device, the top end of the supporting device is fixedly connected with the bottom end of the clamping device, and the load assembly is rotatably connected with the supporting device. The driving device is arranged at a preset power supply position of the supporting device. The load assembly is fixedly connected with a rotating shaft of the motor. The supporting device comprises a bottom plate, a supporting structure, a height adjusting device and a fixing plate, a fixing table is arranged on the bottom plate, the bottom of the clamping device is fixedly connected with the top of the fixing table, the bottom of the supporting structure is fixedly connected with the surface, close to the fixing table, of the bottom plate, and the bottom of the fixing plate is fixedly connected with the surface, away from the fixing table, of the bottom plate. The height adjusting device is arranged on the fixing plate and rotationally connected with the load assembly. Rapid installation of the motor is achieved through the supporting device and the clamping device, and the efficiency and safety of motor load testing are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric motors, in particular to a load testing device and load testing equipment for electric motors. Background Art

[0002] Electric motors are crucial industrial devices. To ensure proper operation and stable performance, they require load testing. Motor load testing is crucial for developing the most efficient motor control strategies, understanding the motor's actual load capacity, and verifying that the motor meets required technical specifications.

[0003] Motor load testing primarily involves evaluating the motor's operating performance and stability under varying load conditions. The measurement circuitry for motor load testing requires high accuracy, stability, and precision. This circuitry must ensure accurate data on all motor parameters and ensure the measurement system's accuracy, stability, and high-frequency response. Comprehensive motor load testing assesses the motor's performance and stability, providing a reference and basis for improvement in practical applications.

[0004] In the prior art, when testing the load of an electric motor, the motor is typically fixed to the volute with screws, and then the impeller is fixed to the motor shaft for load testing. Alternatively, the motor is fixed to a fixture with screws, and then the impeller is fixed to the motor shaft for load testing. The complex installation results in a long test cycle, and different motors require the preparation of impeller and volute models that match the motor, which makes it difficult to test different motors. Therefore, a motor load testing device that is easy to install, safe, and reliable is urgently needed to address the above problems. Utility Model Content

[0005] The utility model provides a load test device and load test equipment for an electric motor, which realizes rapid installation of the electric motor through a supporting device and a clamping device, and solves the problem of improving the efficiency and safety of the load test of the electric motor.

[0006] According to one aspect of the present invention, a load testing device for a motor is provided.

[0007] The load testing device includes a supporting device, a clamping device, a load assembly and a driving device.

[0008] The top end of the support device is fixedly connected to the bottom end of the clamping device, the load assembly is rotatably connected to the support device, the drive device is arranged at a preset power supply position of the support device, and the load assembly is fixedly connected to the rotating shaft of the motor;

[0009] The supporting device includes a base plate, a supporting structure, a height adjustment device and a fixed plate. A fixed platform is provided on the base plate. The bottom of the clamping device is fixedly connected to the top of the fixed platform. The bottom of the supporting structure is fixedly connected to the surface of the base plate close to the fixed platform. The bottom of the fixed plate is fixedly connected to the surface of the base plate away from the fixed platform. The height adjustment device is provided on the fixed plate and is rotatably connected to the load assembly.

[0010] Furthermore, the support structure is a V-shaped structure fixedly arranged at a preset support position of the base plate, the V-shaped structure matches the position of the clamping device, and the support structure is used to fix the motor to perform a load test on the motor.

[0011] Furthermore, the load component includes a through hole,

[0012] A groove is provided on the surface of the through hole, a bayonet is provided on the rotating shaft of the motor, and the groove matches the bayonet;

[0013] The load assembly is fixedly connected to the rotating shaft of the motor through the groove and the bayonet;

[0014] Wherein, the center of the through hole and the axis of the rotating shaft are in a straight line.

[0015] Furthermore, the height adjustment device includes a bearing and a fixing seat, and the fixing seat is movably connected to the fixing plate.

[0016] The bearing is rotatably connected to the fixing seat;

[0017] The height adjustment device is rotatably connected to the load assembly through the bearing.

[0018] Furthermore, the inner ring of the bearing is fixedly connected to the output end of the load assembly and is configured to rotate along with the load assembly;

[0019] The outer ring of the bearing is fixedly connected to the fixing seat.

[0020] Furthermore, the height adjustment device further comprises a groove, the groove comprising a first U-shaped groove and a second U-shaped groove, and the fixing seat is penetrated by a first fixing hole and a second fixing hole.

[0021] The first U-shaped groove and the second U-shaped groove are respectively provided through the fixing plate;

[0022] The first fixing hole matches the first U-shaped groove, and the second fixing hole matches the second U-shaped groove, so as to adjust the center of the circular hole of the load assembly and the axis of the rotating shaft to be in a straight line.

[0023] Furthermore, the height adjustment device further includes a fixing structure, and the fixing structure includes a first fixing structure and a second fixing structure.

[0024] The first fixing structure is respectively provided through the first fixing hole and the first U-shaped groove, and the second fixing structure is respectively provided through the second fixing hole and the second U-shaped groove;

[0025] The fixing structure is used to fix the fixing seat and the fixing plate after adjusting the center of the circular hole of the load component and the axis of the rotating shaft to be in a straight line.

[0026] Furthermore, the driving device is arranged at a preset power supply position on the bottom plate of the supporting device, and the driving device is used to supply power to the electric motor.

[0027] Furthermore, the power supply output terminal of the driving device is electrically connected to the power supply input terminal of the motor, so that the driving device supplies power to the motor.

[0028] On the other hand, the present invention further provides a load testing device for an electric motor, wherein the load testing device comprises at least one load testing device for an electric motor as described in any one of the above items, so as to perform load testing on multiple electric motors simultaneously.

[0029] The beneficial effects of the utility model are:

[0030] The utility model provides a load testing device for an electric motor, the load testing device comprising a supporting device, a clamping device, a load assembly, and a driving device, wherein the top end of the supporting device is fixedly connected to the bottom end of the clamping device, the load assembly is rotatably connected to the supporting device, the driving device is arranged at a preset power supply position of the supporting device, and the load assembly is fixedly connected to the rotating shaft of the electric motor; the supporting device comprises a base plate, a supporting structure, a height adjustment device, and a fixed plate, a fixed platform is arranged on the base plate, the bottom of the clamping device is fixedly connected to the top of the fixed platform, the bottom of the supporting structure is fixedly connected to the surface of the base plate close to the fixed platform, the bottom of the fixed plate is fixedly connected to the surface of the base plate away from the fixed platform, the height adjustment device is arranged on the fixed plate, and the height adjustment device is rotatably connected to the load assembly. The supporting device and the clamping device enable quick installation of the electric motor, shorten the time of the electric motor load test, and solve the problem of improving the efficiency and safety of the electric motor load test. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a first side view of a schematic structural diagram of a load testing device for an electric motor provided by an embodiment of the present utility model;

[0033] Figure 2 This is a second side view of a schematic structural diagram of a load testing device for a motor provided by an embodiment of the present utility model;

[0034] Figure 3 This is a third side view of a schematic structural diagram of a load testing device for a motor provided by an embodiment of the present utility model;

[0035] Figure 4 This is a top view of a schematic structural diagram of a load testing device for an electric motor provided by an embodiment of the present utility model;

[0036] Figure 5 This is a fourth side view of a schematic structural diagram of a load testing device for a motor provided by an embodiment of the present utility model;

[0037] Figure 6 This is a side view of a schematic structural diagram of a load testing device for an electric motor provided by an embodiment of the present utility model;

[0038] Figure 7 It is a top view of a structural schematic diagram of a load testing device for an electric motor provided in an embodiment of the present utility model.

[0039] Among them, the figure marks correspond to: 1-support device, 2-clamping device, 3-load assembly, 4-driving device, 5-motor, 6-base plate, 7-support structure, 8-height adjustment device, 9-fixed plate, 10-fixed platform, 11-bearing, 12-fixed seat, 13-first U-shaped groove, 14-second U-shaped groove, 15-first fixing hole and 16-second fixing hole. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 creative efforts are within the scope of protection of the present invention.

[0041] The current test method for testing the motor load immediately after the environmental test is generally as follows: 1. Fix the motor to the volute with screws, and then fix the impeller to the motor shaft for load testing; 2. Place the motor in the upper and lower V-blocks, and then use metal blocks to adjust the screws on both sides up and down with butterfly nuts to fix the motor (or the motor is fixed to the tooling with screws), and then fix the impeller to the motor shaft for load testing.

[0042] The problems with the first method are: 1. It is time-consuming and labor-intensive. It takes at least 3-5 minutes to install and remove a motor. 2. Since there is only one person during the test, the test cycle will be too long, which has a greater impact on the test that needs to be conducted immediately after the environmental test. 3. For different motors, the impeller and volute models that need to be prepared must match the motor itself, which will result in a large number of items that need to be prepared. It is unrealistic to test the performance of more than ten motors at one time. 4. Although the motor and impeller are installed in the volute, the volute will move with the impeller at the moment of power-on, and the impeller can be easily touched by the tester, which poses a greater safety hazard. The problem with the second method is that although it is more convenient to install, the impeller is exposed to the outside, which is prone to safety hazards during startup.

[0043] like Figure 1 and Figure 2 As shown, the embodiment of the present utility model discloses a load test device for an electric motor, the load test device comprising a support device 1, a clamping device 2, a load assembly 3 and a driving device 4.

[0044] The top end of the support device 1 is fixedly connected to the bottom end of the clamping device 2, the load assembly 3 is rotatably connected to the support device 1, the driving device 4 is arranged at a preset power supply position of the support device 1, and the load assembly 3 is fixedly connected to the rotating shaft of the motor 5;

[0045] The support device 1 includes a base plate 6, a support structure 7, a height adjustment device 8 and a fixed plate 9. A fixed platform 10 is provided on the base plate. The bottom of the clamping device is fixedly connected to the top of the fixed platform. The bottom of the support structure 7 is fixedly connected to the surface of the base plate 6 close to the fixed platform 10. The bottom of the fixed plate 9 is fixedly connected to the surface of the base plate 6 away from the fixed platform 10. The height adjustment device 8 is provided on the fixed plate and is rotatably connected to the load assembly 3.

[0046] Alternatively, as Figure 2As shown, the support structure 7 is a V-shaped structure fixedly arranged at a preset support position of the base plate 6 , and the V-shaped structure matches the position of the clamping device 2 . The support structure 7 is used to fix the motor 5 to perform a load test on the motor 5 .

[0047] Alternatively, as Figure 2 As shown, the support structure 7 is a V-shaped structure fixedly arranged at a preset support position of the base plate, and the motor 5 to be tested is installed between the V-shaped structure and the clamping device 2.

[0048] Alternatively, as Figure 2 As shown, the V-shaped structure is adapted to motors of different sizes.

[0049] Alternatively, as Figure 2 As shown, the clamping device 2 is a quick clamp, and the quick clamp and the V-shaped structure are used to fix the motor 5 to be tested, and the quick clamp and the V-shaped structure are adapted to motors of different sizes.

[0050] Optionally, a V-shaped structure provides a stable support platform, enabling the motor to be quickly positioned and held securely during installation. Its opening angle and size accommodate motors of varying sizes, and a quick-release fixture allows for quick tightening and loosening. The V-shaped structure and quick-release fixture enable rapid motor installation, significantly improving load testing efficiency in industrial automation testing scenarios where test objects require frequent changes.

[0051] Optionally, the load component 3 includes a through hole,

[0052] The surface of the through hole is provided with a groove, and the rotating shaft of the motor 5 is provided with a bayonet, and the groove matches the bayonet;

[0053] The load assembly is fixedly connected to the rotating shaft of the motor 5 through the groove and the bayonet pin;

[0054] Wherein, the center of the through hole and the axis of the rotating shaft are in a straight line.

[0055] Optionally, the load component is a counterweight block, a through hole is provided through the counterweight block, and a groove is provided on the surface of the through hole.

[0056] Alternatively, as Figure 3 As shown, a bayonet is provided on the rotating shaft of the motor 5, and the groove matches the bayonet. By matching the bayonet on the rotating shaft of the motor 5 with the groove on the counterweight, the counterweight is driven to rotate, thereby realizing the load test of the motor 5.

[0057] Alternatively, as Figure 3As shown, different types of motors have different heights of the rotating shaft after being installed in the load testing device. The height of the counterweight block is adjusted according to the type of motor to ensure that the center of the through hole and the axis of the rotating shaft are on the same horizontal line.

[0058] Optionally, a groove and a bayonet are used to securely connect the load assembly to the motor shaft. This not only ensures a secure and reliable connection between the load assembly and the motor shaft, but also facilitates removal and reinstallation, making it particularly advantageous in testing or production environments where frequent load assembly replacement is required. Furthermore, the alignment of the through-hole with the shaft axis reduces vibration and noise during operation, extending the life of the device.

[0059] Alternatively, as Figure 4 As shown, the height adjustment device 8 includes a bearing 11 and a fixing seat 12, and the fixing seat 12 is movably connected to the fixing plate 9.

[0060] The bearing 11 is rotatably connected to the fixing seat 12;

[0061] The height adjustment device 8 is rotatably connected to the load assembly 3 via the bearing 11 .

[0062] Optionally, the inner ring of the bearing 11 is fixedly connected to the output end of the load assembly 3 and is configured to rotate along with the load assembly 3;

[0063] The outer ring of the bearing 11 is fixedly connected to the fixing seat 12 .

[0064] Alternatively, as Figure 4 As shown, the inner ring of the bearing 11 is rotatably connected to the outer ring of the bearing 11, the inner ring of the bearing 11 is fixedly connected to the output end of the counterweight block, and the outer ring of the bearing 11 is fixedly connected to the fixed seat 12. The counterweight block is installed on the fixed seat 12 through the bearing 11, so that the counterweight block follows the rotation of the motor 5 and rotates between the bearing 11 and the motor 5.

[0065] Alternatively, as Figure 4 As shown, the height of the counterweight is adjusted according to the model of the motor, and after the height is matched, the fixing seat 12 is fixed on the fixing plate 9.

[0066] Optionally, the height of the counterweight block is adjusted according to the model of the motor through a height adjustment device to adapt to the height of the motor shaft, so that the counterweight block can rotate with the motor shaft, while achieving low friction and free rotation between the bearing and the motor, facilitating the testing of the motor and improving the accuracy of the test.

[0067] Alternatively, as Figure 4 As shown, the height adjustment device 8 further includes a groove, which includes a first U-shaped groove 13 and a second U-shaped groove 14. The fixing seat 12 is provided with a first fixing hole 15 and a second fixing hole 16.

[0068] The first U-shaped groove 13 and the second U-shaped groove 14 are respectively provided through the fixing plate 9;

[0069] The first fixing hole 15 matches the first U-shaped groove 13 , and the second fixing hole 16 matches the second U-shaped groove 14 , so as to adjust the center of the circular hole of the load assembly 3 and the axis of the rotating shaft to be in a straight line.

[0070] Optionally, the height adjustment device 8 further includes a fixing structure, and the fixing structure includes a first fixing structure and a second fixing structure.

[0071] The first fixing structure is respectively provided through the first fixing hole 15 and the first U-shaped groove 13, and the second fixing structure is respectively provided through the second fixing hole 16 and the second U-shaped groove 14;

[0072] The fixing structure is used to fix the fixing seat 12 and the fixing plate 9 after adjusting the center of the circular hole of the load component 3 and the axis of the rotating shaft to be in a straight line.

[0073] Alternatively, as Figure 4 As shown, two U-shaped grooves are provided on the fixing plate 9 , namely the first U-shaped groove 13 and the second U-shaped groove 14 .

[0074] Optionally, the first fixing structure and the second fixing structure are each a set of matching bolts and threads.

[0075] Optionally, the height of the counterweight is adjusted according to the model of the motor, and when the center of the circular hole of the load assembly 3 is on the same horizontal line as the axis of the rotating shaft, the fixing seat 12 and the fixing plate 9 are fixed using bolts and screw threads.

[0076] Optionally, by moving the height adjustment device on the fixed plate, after the center of the circular hole of the load assembly is in a straight line with the axis of the rotating shaft, the fixed seat and the fixed plate are fixed to ensure precise alignment between the load assembly and the motor shaft, avoid unbalanced load and vibration caused by poor alignment, thereby improving the accuracy of the test and the stability of the motor operation.

[0077] Optionally, the driving device 4 is disposed at a preset power supply position on the bottom plate 6 of the supporting device 1 , and the driving device 4 is used to supply power to the motor 5 .

[0078] Optionally, the power supply output terminal of the driving device 4 is electrically connected to the power supply input terminal of the motor 5 , so that the driving device 4 supplies power to the motor 5 .

[0079] Optionally, the driving device 4 may be a driving board (DC motor), a capacitor, or a through line (AC motor).

[0080] Optionally, the motor to be tested is mounted on the load testing device, the motor is clamped with a quick clamp, the power cord of the motor is connected to the power supply output end of the drive device, and the power supply is connected to perform a load test on the motor.

[0081] Optionally, the motor is powered by a driving device to implement a load test of the motor, thereby improving the safety and convenience of the test.

[0082] The working principle of the motor load test device described in the embodiment of the utility model is as follows:

[0083] When the motor is required to be loaded and tested immediately after the environmental test, the motor is placed on the motor load test device and combined with the counterweight, the motor is clamped with a quick clamp, the power cord of the motor is connected to the drive device, and the power is turned on to quickly test the motor.

[0084] like Figure 6 and Figure 7 It is shown that an embodiment of the present invention further discloses a load testing device for an electric motor, wherein the load testing device includes at least one load testing device for an electric motor as described in any one of the above items, so as to perform load testing on multiple electric motors at the same time.

[0085] The working principle of the load test device for the motor described in the embodiment of the utility model is as follows:

[0086] When it is required to immediately perform load testing on multiple motors after the environmental test, each motor is placed on the motor load testing device in turn and combined with the counterweight block, the motor is clamped with a quick clamp, the power cord of the motor is connected to the drive device, and the power is turned on, and multiple motors can be quickly tested.

[0087] The beneficial effects of the embodiments of the present utility model are:

[0088] The utility model provides a load testing device for an electric motor, the load testing device comprising a supporting device, a clamping device, a load assembly, and a driving device, wherein the top end of the supporting device is fixedly connected to the bottom end of the clamping device, the load assembly is rotatably connected to the supporting device, the driving device is arranged at a preset power supply position of the supporting device, and the load assembly is fixedly connected to the rotating shaft of the electric motor; the supporting device comprises a base plate, a supporting structure, a height adjustment device, and a fixed plate, a fixed platform is arranged on the base plate, the bottom of the clamping device is fixedly connected to the top of the fixed platform, the bottom of the supporting structure is fixedly connected to the surface of the base plate close to the fixed platform, the bottom of the fixed plate is fixedly connected to the surface of the base plate away from the fixed platform, the height adjustment device is arranged on the fixed plate, and the height adjustment device is rotatably connected to the load assembly. The supporting device and the clamping device enable quick installation of the electric motor, shorten the time of the electric motor load test, and solve the problem of improving the efficiency and safety of the electric motor load test.

[0089] In this utility model, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal connection between two components, or interaction between two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0090] It should be noted that the order of the above embodiments of the present invention is for descriptive purposes only and does not represent the superiority or inferiority of the embodiments. Moreover, the above description describes specific embodiments, and other embodiments are also within the scope of the appended claims. In some cases, the actions or steps described in the claims can be performed in the order of different embodiments and can achieve the expected results. In addition, the processes depicted in the drawings do not necessarily require a specific order or a connection order to achieve the desired results. In some embodiments, multi-tasking parallel processing is also possible or may be advantageous.

[0091] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. The key points of each embodiment are the differences from other embodiments.

[0092] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A load test device for an electric motor, characterized in that: The load testing device comprises a supporting device (1), a clamping device (2), a load assembly (3) and a driving device (4). The top end of the support device (1) is fixedly connected to the bottom end of the clamping device (2), the load component (3) is rotatably connected to the support device (1), the drive device (4) is arranged at a preset power supply position of the support device (1), and the load component (3) is fixedly connected to the rotating shaft of the motor (5); The supporting device (1) comprises a base plate (6), a supporting structure (7), a height adjustment device (8) and a fixed plate (9); a fixed platform (10) is provided on the base plate (6); the bottom of the clamping device (2) is fixedly connected to the top of the fixed platform (10); the bottom of the supporting structure (7) is fixedly connected to the surface of the base plate (6) close to the fixed platform (10); the bottom of the fixed plate (9) is fixedly connected to the surface of the base plate (6) away from the fixed platform (10); the height adjustment device (8) is provided on the fixed plate (9); and the height adjustment device (8) is rotatably connected to the load assembly (3).

2. The load testing device for an electric motor according to claim 1, characterized in that: The support structure (7) is a V-shaped structure fixedly arranged at a preset support position of the base plate, the V-shaped structure matches the position of the clamping device (2), and the support structure (7) is used to fix the motor to perform a load test on the motor (5).

3. The load testing device for an electric motor according to claim 1, wherein: The load component (3) comprises a through hole, A groove is provided on the surface of the through hole, a bayonet is provided on the rotating shaft of the motor (5), and the groove matches the bayonet; The load assembly (3) is fixedly connected to the rotating shaft of the motor (5) via the groove and the bayonet; Wherein, the center of the through hole and the axis of the rotating shaft are in a straight line.

4. The load testing device for an electric motor according to claim 1, wherein: The height adjustment device (8) includes a bearing (11) and a fixing seat (12), wherein the fixing seat (12) is movably connected to the fixing plate (9). The bearing (11) is rotatably connected to the fixing seat (12); The height adjustment device (8) is rotationally connected to the load assembly (3) via the bearing (11).

5. The load testing device for an electric motor according to claim 4, characterized in that: The inner ring of the bearing (11) is fixedly connected to the output end of the load component (3) and is used to rotate along with the load component (3); The outer ring of the bearing (11) is fixedly connected to the fixing seat (12).

6. The load testing device for an electric motor according to claim 4, characterized in that: The height adjustment device (8) further comprises a groove, wherein the groove comprises a first U-shaped groove (13) and a second U-shaped groove (14); a first fixing hole (15) and a second fixing hole (16) are provided through the fixing seat (12); The first U-shaped groove (13) and the second U-shaped groove (14) are respectively provided through the fixing plate (9); The first fixing hole (15) matches the first U-shaped groove (13), and the second fixing hole (16) matches the second U-shaped groove (14), so as to adjust the center of the circular hole of the load component (3) and the axis of the rotating shaft to be in a straight line.

7. The load testing device for an electric motor according to claim 6, characterized in that: The height adjustment device (8) further comprises a fixing structure, wherein the fixing structure comprises a first fixing structure and a second fixing structure. The first fixing structure is respectively provided through the first fixing hole (15) and the first U-shaped groove (13), and the second fixing structure is respectively provided through the second fixing hole (16) and the second U-shaped groove (14); The fixing structure is used to fix the fixing seat (12) and the fixing plate (9) after adjusting the center of the circular hole of the load component (3) and the axis of the rotating shaft to be in a straight line.

8. The load testing device for an electric motor according to claim 1, wherein: The driving device (4) is arranged at a preset power supply position on the bottom plate (6) of the supporting device (1), and the driving device (4) is used to supply power to the electric motor (5).

9. The load testing device for an electric motor according to claim 8, characterized in that: The power supply output end of the driving device (4) is electrically connected to the power supply input end of the electric motor (5), so that the driving device (4) supplies power to the electric motor (5).

10. A load test device for an electric motor, characterized in that: The load testing equipment comprises at least one load testing device for an electric motor according to any one of claims 1 to 9, so as to perform load testing on a plurality of electric motors at the same time.

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