Test system

Abstract

The application provides a test system, which comprises a test device and a control device. The test device comprises a plurality of test circuits, one test circuit corresponding to one to-be-tested device, and one test circuit comprising a first test terminal and a second test terminal. The control device is used for controlling the electrical connection between the first target to-be-tested terminal and the first target test terminal and the electrical connection between the second target to-be-tested terminal and the second target test terminal when testing a target to-be-tested device. The target to-be-tested device is any one of the to-be-tested devices, the first target to-be-tested terminal is the first to-be-tested terminal of the target to-be-tested device, the second target to-be-tested terminal is the second to-be-tested terminal of the target to-be-tested device, the first target test terminal is the first test terminal of the target test circuit, the second target test terminal is the second test terminal of the target test circuit, and the target test circuit is the test circuit corresponding to the target to-be-tested device. The system solves the problem that the conventional electric wheel test bench in the prior art cannot test different types of to-be-tested devices.

Description

Technical Field

[0001] This application relates to the field of electric drive technology for mining applications, and more specifically, to a testing system. Background Technology

[0002] Large mining dump trucks occupy a dominant position among transport vehicles in large open-pit mines worldwide. In mines both domestically and internationally, the most prevalent type of dump truck is the large electric wheel dump truck with AC-DC or AC-DC-AC drive. Currently, in domestic open-pit mines, both imported and domestically produced equipment operate in parallel. Examples include imported electric shovels such as the 395BI, 2800XP, and 495HR, and imported dump trucks such as the 630E, 730E, 830E, MT4400AC, and MT5500B; domestically produced electric shovels such as the WK-10B, WK-20, WK-35, and WK-55; and domestically produced dump trucks such as the SF3102, SF32601, and SF33900. Whether domestically produced or imported, malfunctions are inevitable during operation, especially in the core transmission components—generators, electric motors, and wheel motor assemblies. Therefore, it is essential for mining and industrial enterprises that manufacture or repair electric wheels to have a qualified electric wheel test bench.

[0003] The electric wheel simulated industrial and mining load test bench utilizes a drive unit, loading unit, instruments, meters, and related equipment to inspect and test the electrical, mechanical, safety, and reliability technical indicators of semi-finished and finished electric wheels produced during manufacturing and repair, according to relevant standards. These inspections and tests can fully or partially reflect the relevant performance data of the tested product. By rationally utilizing this data, it is possible to determine whether the tested product meets the expected requirements, its quality, and the goals and directions for improvement. Electric wheel testing is a crucial step in the comprehensive evaluation of electric wheel assembly quality and technical performance, and is an indispensable part of the research, manufacturing, and repair process of electric wheels.

[0004] In the manufacturing and repair of electric wheels, testing is mainly divided into two stages: semi-finished product testing and finished product testing. Semi-finished product testing primarily focuses on the electrical components and assemblies of the electric wheel. Examples include measuring the DC resistance of the windings, conducting inter-turn withstand voltage tests on the windings, determining the insulation resistance between the windings and the casing, and testing the dielectric strength (i.e., withstand voltage tests) between windings and each other. Finished product testing involves testing the motor after it has been assembled into a complete machine to obtain some or all of the performance data. Therefore, designing a comprehensive testing platform is essential for the manufacturing and repair of electric wheels for dump trucks.

[0005] Domestically, some industrial and mining enterprises have conducted research and development on test benches for certain key components of electric wheels, and have achieved some results. For example, in 2006, Jiangxi Dexing Copper Mine developed a test bench for the GE776 / GE788 wheel motor. Based on the specific electrical and mechanical performance requirements of the wheel motor, it can conduct no-load, speed (low speed and rated speed), and load (20% and 30% of rated load) tests, ensuring that the wheel motor meets the requirements before being installed and put into operation. In addition, in 2013, CRRC Qishuyan Institute designed a back-to-back loading test platform for the 220-ton wheel-side reducer used in mining, capable of conducting tests on the 220-ton wheel-side reducer, including starting torque testing, running-in testing, real-condition simulation testing, efficiency testing, vibration testing, noise testing, and housing sealing performance.

[0006] Judging from the existing testing platforms and patent applications of domestic industrial and mining enterprises, comprehensive testing platforms encompassing numerous testing objects have not yet been researched and developed. This objectively restricts the commissioning rate of mining equipment and indirectly affects the efficiency of industrial and mining enterprises. Therefore, comprehensive testing platforms are extremely important for industrial and mining enterprises. Summary of the Invention

[0007] The main objective of this application is to provide a testing system to solve the problem that traditional electric wheel test benches in the prior art cannot test different types of devices under test.

[0008] According to one aspect of the embodiments of this application, a testing system is provided for testing the performance parameters of multiple different types of devices under test (DUTs). One DUT includes a first test terminal and a second test terminal. The testing system includes: a testing device comprising multiple test circuits, one DUT corresponding to one test circuit, and one test circuit including a first test terminal and a second test terminal; and a control device for controlling the first target DUT to be electrically connected to the first target test terminal and controlling the second target DUT to be electrically connected to the second target test terminal when testing the target DUT. The target DUT is any one of the DUTs, the first target DUT is the first test terminal of the target DUT, the second target DUT is the second test terminal of the target DUT, the first target test terminal is the first test terminal of the target test circuit, the second target test terminal is the second test terminal of the target test circuit, and the target test circuit is the test circuit corresponding to the target DUT.

[0009] Optionally, the testing system further includes a power supply device, which also includes a first frequency converter, a second frequency converter, and a first auxiliary test device. The first auxiliary test device includes a first auxiliary test terminal and a second auxiliary test terminal. The first frequency converter includes a first rectifier module and a first inverter module, and the second frequency converter includes a second inverter module. The AC terminal of the first rectifier module is electrically connected to the power supply device, and the DC terminals of the first rectifier module, the first inverter module, and the second inverter module are all electrically connected to a DC high-voltage bus. The target device under test is a first electric shovel motor under test. The target test circuit includes the first frequency converter, the second frequency converter, and the first auxiliary test device. The control device is used to control the first auxiliary test terminal to be electrically connected to the AC terminal of the first inverter module, control the second auxiliary test terminal to be electrically connected to the first target test terminal, and control the AC terminal of the second inverter module to be electrically connected to the second target test terminal. The first auxiliary test device is used to load the first electric shovel motor under test.

[0010] Optionally, the testing device further includes a first transformer and a filter. The target device under test is a second electric shovel motor under test, the rated voltage of the second electric shovel motor under test is higher than the rated voltage of the first electric shovel motor under test. The target testing circuit includes a first frequency converter, a second frequency converter, a first auxiliary testing device, a first transformer, and the filter. The control device is used to control the first auxiliary testing terminal to be electrically connected to the AC terminal of the first inverter module, control the second auxiliary testing terminal to be electrically connected to the first target testing terminal, control one end of the filter to be electrically connected to the AC terminal of the second inverter module, control the other end of the filter to be electrically connected to the low-voltage terminal of the first transformer, and control the high-voltage terminal of the first transformer to be electrically connected to the second target testing terminal. The first auxiliary testing device is used to load the second electric shovel motor under test.

[0011] Optionally, the testing device further includes a second auxiliary testing device, which includes a third auxiliary testing terminal and a fourth auxiliary testing terminal. The target device under test is a motor under test. The target test circuit includes the first frequency converter, the second frequency converter, the filter, the first transformer, and the second auxiliary testing device. The control device is used to control the third auxiliary testing terminal to be electrically connected to the AC terminal of the first inverter module, control the fourth auxiliary testing terminal to be electrically connected to the first target test terminal, control one end of the filter to be electrically connected to the AC terminal of the second inverter module, control the other end of the filter to be electrically connected to the low-voltage terminal of the first transformer, and control the high-voltage terminal of the first transformer to be electrically connected to the second target test terminal. The second auxiliary testing device is used to load or brake the motor under test.

[0012] Optionally, the second frequency converter further includes a second rectifier module, the first auxiliary test device includes a fifth auxiliary test terminal, the DC terminal of the second rectifier module is electrically connected to the DC high-voltage bus, the target device under test is a generator under test, the target test circuit includes the first frequency converter, the second frequency converter, the first transformer and the first auxiliary test device, the control device is used to control the first auxiliary test terminal to be electrically connected to the AC terminal of the first inverter module, control the fifth auxiliary test terminal to be electrically connected to the first target test terminal, control the AC terminal of the second rectifier module to be electrically connected to the low-voltage terminal of the first transformer, control the high-voltage terminal of the first transformer to be electrically connected to the second target test terminal, control the second auxiliary test terminal to be in a floating state, and the first auxiliary test device is used to load the generator under test.

[0013] Optionally, the first auxiliary testing device further includes a first motor and a first capacitor. The first motor includes a first end and a second end. The first end is electrically connected to the first auxiliary testing end, the second end is electrically connected to one end of the first capacitor, and the other end of the first capacitor is electrically connected to the second auxiliary testing end.

[0014] Optionally, the first test device further includes a second capacitor, and the first motor further includes a third terminal, the third terminal being electrically connected to one end of the second capacitor, and the other end of the second capacitor being electrically connected to the fifth test terminal.

[0015] Optionally, the second auxiliary testing device further includes a second motor, a gearbox, a third capacitor, and a fourth capacitor. One end of the second motor is electrically connected to the third auxiliary testing terminal, the other end of the second motor is electrically connected to one end of the third capacitor, the other end of the third capacitor is electrically connected to one end of the gearbox, the other end of the gearbox is electrically connected to one end of the fourth capacitor, and the other end of the fourth capacitor is electrically connected to the fourth auxiliary testing terminal.

[0016] Optionally, the first rectifier module includes a first filter unit and a first rectifier unit. The input terminal of the first filter unit is electrically connected to the power supply device, the output terminal of the first filter unit is electrically connected to the AC terminal of the first rectifier unit, and the DC terminal of the first rectifier unit is electrically connected to the DC high-voltage bus.

[0017] Optionally, the second rectifier module includes a second filter unit and a second rectifier unit. The input terminal of the second filter unit is electrically connected to the DC terminal of the second rectifier module, the output terminal of the second filter unit is electrically connected to the AC terminal of the second rectifier unit, and the DC terminal of the second rectifier unit is electrically connected to the DC high-voltage bus.

[0018] Optionally, the testing device further includes a third rectifier module and an AC power supply. The generator under test also includes an excitation terminal, which is electrically connected to the DC terminal of the third rectifier module. The control device is used to control the AC power supply to be electrically connected to the AC terminal of the third rectifier module when testing the generator under test.

[0019] Optionally, the test system further includes a high-voltage power grid, the power supply device further includes a second transformer, and the control device is used to control the high-voltage end of the second transformer to be electrically connected to the high-voltage power grid when testing the target device under test, and to control the low-voltage end of the second transformer to be electrically connected to the AC end of the first rectifier module.

[0020] In the aforementioned testing system, the testing device includes multiple test circuits, with one test circuit corresponding to each device under test (DUT). Each test circuit includes a first test terminal and a second test terminal. A control device is also included, which controls the first target DUT to be electrically connected to the first target test terminal and the second target DUT to be electrically connected to the second target test terminal when testing the target DUT. The target DUT can be any one of the DUTs, the first target DUT is the first test terminal of the target DUT, the second target DUT is the second test terminal of the target DUT, the first target test terminal is the first test terminal of the target test circuit, and the second target test terminal is the second test terminal of the target test circuit. The target test circuit is the test circuit corresponding to the target DUT. One test circuit of the testing device in this system is used to test one type of DUT. The multiple test circuits of the testing device enable the testing of multiple types of DUTs using the same testing device. This system solves the problem that traditional electric wheel test benches in the prior art cannot test different types of DUTs. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 A schematic diagram of a test system according to an embodiment of this application is shown;

[0023] Figure 2 A schematic diagram of a test system according to a specific embodiment of this application is shown;

[0024] Figure 3 A schematic diagram of a test system according to another specific embodiment of this application is shown;

[0025] Figure 4A schematic diagram of a test system according to another specific embodiment of this application is shown;

[0026] Figure 5 A schematic diagram of a test system according to yet another specific embodiment of this application is shown.

[0027] The above figures include the following reference numerals:

[0028] 10. Device under test; 11. First electric shovel motor under test; 12. Second electric shovel motor under test; 13. Motor under test; 14. Generator under test; 20. Testing device; 21. First frequency converter; 22. Second frequency converter; 23. First auxiliary device under test; 24. First rectifier module; 25. First inverter module; 26. Second inverter module; 27. First transformer; 28. Filter; 29. ​​Second auxiliary device under test; 30. Power supply device; 31. Second transformer; 40. DC high-voltage bus; 50. Second rectifier module; 60. High-voltage power grid; 70. AC power supply; 80. Third rectifier module. Detailed Implementation

[0029] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0030] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be an intermediate element present. Furthermore, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element via a third element.

[0032] As mentioned in the background section, traditional electric wheel test benches in the prior art cannot test different types of devices under test. In order to solve the above problems, a typical embodiment of this application provides a test system.

[0033] According to an embodiment of this application, a testing system is provided.

[0034] Figure 1 This is a schematic diagram of a test system according to an embodiment of this application. For example... Figure 1 As shown, the above-mentioned test system is used to test the performance parameters of multiple different types of devices under test 10. One of the devices under test 10 includes a first test terminal and a second test terminal. The test system includes:

[0035] Test device 20, which includes multiple test circuits, one device under test 10 corresponds to one test circuit, and one test circuit includes a first test terminal and a second test terminal.

[0036] The control device is used to control the first target test terminal to be electrically connected to the first target test terminal and to the second target test terminal when testing the target device under test. The target device under test is any one of the devices under test. The first target test terminal is the first test terminal of the target device under test. The second target test terminal is the second test terminal of the target device under test. The first target test terminal is the first test terminal of the target test circuit. The second target test terminal is the second test terminal of the target test circuit. The target test circuit is the test circuit corresponding to the target device under test.

[0037] In the aforementioned testing system, the testing device includes multiple test circuits, with one test circuit corresponding to each device under test (DUT). Each test circuit includes a first test terminal and a second test terminal. A control device is also included, which controls the first target DUT to be electrically connected to the first target test terminal and the second target DUT to be electrically connected to the second target test terminal when testing the target DUT. The target DUT can be any one of the DUTs, the first target DUT is the first test terminal of the target DUT, the second target DUT is the second test terminal of the target DUT, the first target test terminal is the first test terminal of the target test circuit, and the second target test terminal is the second test terminal of the target test circuit. The target test circuit is the test circuit corresponding to the target DUT. One test circuit of the testing device in this system is used to test one type of DUT. The multiple test circuits of the testing device enable the testing of multiple types of DUTs using the same testing device. This system solves the problem that traditional electric wheel test benches in the prior art cannot test different types of DUTs.

[0038] To test the performance parameters of a 690V electric shovel motor, in one optional implementation, such as... Figure 2As shown, the aforementioned test system also includes a power supply device 30. The aforementioned test device 20 further includes a first frequency converter 21, a second frequency converter 22, and a first auxiliary test device 23. The first auxiliary test device 23 includes a first auxiliary test terminal and a second auxiliary test terminal. The first frequency converter 21 includes a first rectifier module 24 and a first inverter module 25. The second frequency converter 22 includes a second inverter module 26. The AC terminal of the first rectifier module 24 is electrically connected to the aforementioned power supply device 30. The DC terminal of the first rectifier module 24, the DC terminal of the first inverter module 25, and the DC terminal of the second inverter module 26 are also connected to the power supply device 30. The DC terminals of module 26 are all electrically connected to the DC high-voltage bus 40. The target device under test is the first electric shovel motor 11 under test. The target test circuit includes a first frequency converter 21, a second frequency converter 22, and a first auxiliary test device 23. The control device is used to control the first auxiliary test terminal to be electrically connected to the AC terminal of the first inverter module 25, control the second auxiliary test terminal to be electrically connected to the first target test terminal, and control the AC terminal of the second inverter module 26 to be electrically connected to the second target test terminal. The first auxiliary test device 23 is used to load the first electric shovel motor 11 under test.

[0039] In the above embodiments, such as Figure 2 As shown, when testing the 690V electric shovel motor, i.e., the first electric shovel motor 11 under test, the control device control switch S1 is closed, so that the AC terminal of the first rectifier module 24 is electrically connected to the power supply device 30. Furthermore, the first rectifier module 24 operates in rectification mode, supplying power to the DC high-voltage bus 40 to ensure the normal operation of the test system. The control device control switch S2 is closed, so that the first auxiliary test device 23 is electrically connected to the AC terminal of the first inverter module 25. The control device controls the first auxiliary test device 23 to be electrically connected to the first electric shovel motor 11 under test. Furthermore, the first inverter module 25 operates in feedback mode, so that the first auxiliary test device... The first test device 23 operates in torque closed-loop mode. The control device adjusts the torque of the first test device 23 in real time according to the test conditions to load the first electric shovel motor 11 under test. The energy of the first test device 23 is fed back to the DC high-voltage bus 40 through the first inverter module 25. The control device controls the switch S3 to close, so that the AC terminal of the second inverter module 26 is electrically connected to the first electric shovel motor 11 under test. The second inverter module 26 operates in electric mode, driving the first electric shovel motor 11 under test, so that the first electric shovel motor 11 under test operates in speed closed-loop mode, thereby realizing the test of the electric characteristics of the first electric shovel motor 11 under test.

[0040] It should be noted that, in order to ensure the security of the test, such as Figure 2 As shown, the first test device 23 is electrically connected to the switch S2 via the adapter K1 of the adapter box K, and the first electric shovel motor 11 under test is electrically connected to the switch S3 via the adapter K2 of the adapter box K.

[0041] To achieve loading of the first electric shovel motor under test, in one optional implementation, such as... Figure 2 As shown, the first auxiliary testing device 23 further includes a first motor M1 and a first capacitor C1. The first motor M1 includes a first end and a second end. The first end is electrically connected to the first auxiliary testing end, the second end is electrically connected to one end of the first capacitor C1, and the other end of the first capacitor is electrically connected to the second auxiliary testing end.

[0042] In the above embodiments, such as Figure 2 As shown, the first electric shovel motor 11 under test is electrically connected to the first motor M1 via the first capacitor C1. The first motor M1 is electrically connected to the AC terminal of the first inverter module 25. The first inverter module 25 operates in feedback mode, which makes the first motor M1 operate in torque closed-loop mode. The control device adjusts the torque of the first motor M1 in real time according to the test conditions to load the first electric shovel motor 11 under test and feeds the energy of the first motor M1 back to the DC high-voltage bus 40 through the first inverter module 25.

[0043] To ensure the normal operation of the first frequency converter, in one optional implementation, such as Figure 2 As shown, the first rectifier module 24 includes a first filter unit A1 and a first rectifier unit B1. The input terminal of the first filter unit A1 is electrically connected to the power supply device 30, the output terminal of the first filter unit A1 is electrically connected to the AC terminal of the first rectifier unit B1, and the DC terminal of the first rectifier unit B1 is electrically connected to the DC high-voltage bus 40.

[0044] In the above embodiments, such as Figure 2 As shown, a first filter unit A1 is connected to the AC terminal of the first rectifier unit B1 to filter the AC power entering the first frequency converter 21, remove harmonics, and ensure the normal operation of the first frequency converter 21.

[0045] To ensure the normal operation of the testing system, in one optional implementation, such as Figure 2 As shown, the above-mentioned test system also includes a high-voltage power grid 60, the above-mentioned power supply device 30 also includes a second transformer 31, and the above-mentioned control device is used to control the high-voltage end of the second transformer 31 to be electrically connected to the high-voltage power grid 60 when testing the above-mentioned target device under test, and to control the low-voltage end of the second transformer 31 to be electrically connected to the AC end of the first rectifier module 24.

[0046] In the above embodiment, when the control device tests the target device under test, it closes switches G1, G2 and S1, so that the voltage of the high-voltage power grid 60 is stepped down by the second transformer 31 and then enters the test device 20 through the AC terminal of the first rectifier module 24 to supply power to the test device 20, thereby ensuring the normal operation of the test system. The voltage level of the high-voltage power grid 60 is 6.3kV and the turns ratio of the second transformer 31 is 6.3kV / 690V.

[0047] To test the performance parameters of a 1400V electric shovel motor, in one optional implementation, such as... Figure 3 As shown, the test device 20 further includes a first transformer 27 and a filter 28. The target device under test is a second electric shovel motor 12 under test. The rated voltage of the second electric shovel motor 12 under test is higher than the rated voltage of the first electric shovel motor 11 under test. The target test circuit includes the first frequency converter 21, the second frequency converter 22, the first auxiliary test device 23, the first transformer 27, and the filter 28. The control device is used to control the first auxiliary test terminal to be electrically connected to the AC terminal of the first inverter module 25, control the second auxiliary test terminal to be electrically connected to the first target test terminal, control one end of the filter 28 to be electrically connected to the AC terminal of the second inverter module, control the other end of the filter 28 to be electrically connected to the low-voltage terminal of the first transformer 27, and control the high-voltage terminal of the first transformer 27 to be electrically connected to the second target test terminal. The first auxiliary test device 23 is used to load the second electric shovel motor 12 under test.

[0048] In the above embodiments, such as Figure 3As shown, when testing the 1400V electric shovel motor, i.e., the first electric shovel motor 11 under test, the control device control switch S1 is closed, so that the AC terminal of the first rectifier module 24 is electrically connected to the power supply device 30. Furthermore, the first rectifier module 24 operates in rectification mode, supplying power to the DC high-voltage bus 40 to ensure the normal operation of the test system. The control device control switch S2 is closed, so that the first auxiliary test device 23 is electrically connected to the AC terminal of the first inverter module 25. The control device controls the first auxiliary test device 23 to be electrically connected to the second electric shovel motor 12 under test. The first inverter module 25 operates in feedback mode, so that the first auxiliary test device 23 operates in torque closed mode. In loop mode, the control device adjusts the torque of the first test device 23 in real time according to the test conditions to load the second electric shovel motor 12 under test, and feeds the energy of the first test device 23 back to the DC high-voltage bus 40 through the first inverter module 25. The control device controls the switches S4 and S5 to close, so that the AC terminal of the second inverter module 26 is electrically connected to the second electric shovel motor 12 under test through the filter 28 and the first transformer 27. The second inverter module 26 operates in electric mode, driving the second electric shovel motor 12 under test, so that the second electric shovel motor 12 under test operates in VF mode, thereby realizing the test of the electric characteristics of the second electric shovel motor 12 under test.

[0049] It should be noted that, in order to ensure the security of the test, such as Figure 3 As shown, the first test device 23 is electrically connected to the switch S2 via the adapter K1 of the adapter box K, and the second electric shovel motor 12 under test is electrically connected to the high-voltage end of the first transformer 27 via the adapter K3 of the adapter box K.

[0050] It should also be noted that, in order to achieve loading on the motor of the second electric shovel under test, such as... Figure 3 As shown, the second electric shovel motor 12 under test is electrically connected to the first motor M1 via the first capacitor C2. The first motor M1 is electrically connected to the AC terminal of the first inverter module 25. The first inverter module 25 operates in feedback mode, which makes the first motor M1 operate in torque closed-loop mode. The control device adjusts the torque of the first motor M1 in real time according to the test conditions to load the second electric shovel motor 12 under test and feeds the energy of the first motor M1 back to the DC high-voltage bus 40 through the first inverter module 25.

[0051] To test the performance parameters of the motor under test, in one optional implementation, such as... Figure 4As shown, the testing device 20 further includes a second auxiliary testing device 29, which includes a third auxiliary testing terminal and a fourth auxiliary testing terminal. The target device under test is the motor under test 13. The target test circuit includes the first frequency converter 21, the second frequency converter 22, the filter 28, the first transformer 27, and the second auxiliary testing device 29. The control device is used to control the third auxiliary testing terminal to be electrically connected to the AC terminal of the first inverter module 25, control the fourth auxiliary testing terminal to be electrically connected to the first target test terminal, control one end of the filter 28 to be electrically connected to the AC terminal of the second inverter module 26, control the other end of the filter 28 to be electrically connected to the low-voltage terminal of the first transformer 27, and control the high-voltage terminal of the first transformer 27 to be electrically connected to the second target test terminal. The second auxiliary testing device 29 is used to load or brake the motor under test 13.

[0052] In the above embodiments, such as Figure 4 As shown, when testing the motor under test 13, the control device closes the control switch S1, which connects the AC terminal of the first rectifier module 24 to the power supply device 30. The first rectifier module 24 operates in rectification mode, supplying power to the DC high-voltage bus 40 to ensure the normal operation of the test system. The control device closes the control switch S2, which connects the second auxiliary test device 29 to the AC terminal of the first inverter module 25. The control device controls the second auxiliary test device 29 to connect to the motor under test 13. The first inverter module 25 operates in feedback mode, causing the second auxiliary test device 29 to operate in torque closed-loop mode. The control device adjusts the torque direction of the second test device 29 in real time according to the test conditions to load or brake the motor 13 under test, and feeds the energy of the second test device 29 back to the DC high-voltage bus 40 through the first inverter module 25. The control device controls the switches S4 and S5 to close, so that the AC terminal of the second inverter module 26 is electrically connected to the motor 13 under test through the filter 28 and the first transformer 27. The second inverter module 26 operates in electric mode, driving the motor 13 under test, so that the motor 13 under test operates in VF mode, thereby realizing the test of the electric characteristics of the motor 13 under test.

[0053] It should be noted that, in order to ensure the security of the test, such as Figure 4 As shown, the second test device 29 is electrically connected to the switch S2 via the adapter K1 of the adapter box K, and the motor under test 13 is electrically connected to the high-voltage end of the first transformer 27 via the adapter K3 of the adapter box K.

[0054] To achieve loading of the motor under test, in one optional implementation, such as... Figure 4As shown, the second test device 29 further includes a second motor M2, a gearbox D, a third capacitor C3, and a fourth capacitor C4. One end of the second motor M2 is electrically connected to the third test terminal, the other end of the second motor M2 is electrically connected to one end of the third capacitor C3, the other end of the third capacitor C3 is electrically connected to one end of the gearbox D, the other end of the gearbox D is electrically connected to one end of the fourth capacitor C4, and the other end of the fourth capacitor C4 is electrically connected to the fourth test terminal.

[0055] In the above embodiments, such as Figure 4 As shown, the motor under test 13 is electrically connected to the second motor M2 via the fourth capacitor C4, gearbox D and the third capacitor C3. The first motor M2 is electrically connected to the AC terminal of the first inverter module 25. The first inverter module 25 operates in feedback mode, so that the second test device 29 operates in torque closed-loop mode. The control device adjusts the torque direction of the second motor M2 in real time according to the test conditions to realize the loading and braking of the motor under test 13, and feeds the energy of the second motor M2 back to the DC high-voltage bus 40 through the first inverter module 25.

[0056] To test the performance parameters of the generator under test, in one optional implementation, such as... Figure 5 As shown, the second frequency converter 22 further includes a second rectifier module 50, the first auxiliary test device 23 includes a fifth auxiliary test terminal, the DC terminal of the second rectifier module 50 is electrically connected to the DC high-voltage bus 40, the target device under test is the generator under test 14, the target test circuit includes the first frequency converter 21, the second frequency converter 22, the first transformer 27 and the first auxiliary test device 23, the control device is used to control the first auxiliary test terminal to be electrically connected to the AC terminal of the first inverter module 25, control the fifth auxiliary test terminal to be electrically connected to the first target test terminal, control the AC terminal of the second rectifier module 50 to be electrically connected to the low-voltage terminal of the first transformer 27, control the high-voltage terminal of the first transformer 27 to be electrically connected to the second target test terminal, control the second auxiliary test terminal to be in a floating state, and the first auxiliary test device 23 is used to load or brake the generator under test 14.

[0057] In the above embodiments, such as Figure 5As shown, when testing the generator under test 14, the control device controls the switch S1 to close, so that the AC terminal of the first rectifier module 24 is electrically connected to the power supply device 30. The first rectifier module 24 operates in rectification mode to supply power to the DC high-voltage bus 40 to ensure the normal operation of the test system. The control device controls the switch S2 to close, so that the first auxiliary test device 23 is electrically connected to the AC terminal of the first inverter module 25. The control device controls the first auxiliary test device 23 to be electrically connected to the generator under test 14. The first inverter module 25 operates in motor mode, so that the first auxiliary test device 23 operates in speed closed-loop mode, thereby realizing the test of the power generation characteristics of the generator under test 14. The first auxiliary test device 23 acts as the prime mover of the generator under test 14 to realize the closed-loop regulation of the generator terminal voltage of the generator under test 14. The control device controls the switch S6 to close, so that the energy of the generator under test 14 is fed back to the DC high-voltage bus 40 through the second rectifier module 50.

[0058] To test the power generation characteristics of the generator under test, in one optional implementation, such as... Figure 5 As shown, the first test device 23 further includes a second capacitor C2, and the first motor M1 further includes a third terminal. The third terminal is electrically connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is electrically connected to the fifth test terminal.

[0059] In the above embodiments, such as Figure 5 As shown, the generator under test 14 is electrically connected to the first motor M1 via the first capacitor C2. The first motor M1 is electrically connected to the AC terminal of the first inverter module 25. The first inverter module 25 operates in motor mode, which makes the first motor M1 operate in speed closed-loop mode, and the first auxiliary test device 23 operates in speed closed-loop mode, thereby realizing the test of the power generation characteristics of the generator under test 14.

[0060] To ensure the normal operation of the generator under test, in one optional implementation, such as Figure 5 As shown, the test device 20 also includes a third rectifier module 80 and an AC power supply 70. The generator under test 14 also includes an excitation terminal, which is electrically connected to the DC terminal of the third rectifier module 80. The control device is used to control the AC power supply to be electrically connected to the AC terminal of the third rectifier module 80 when testing the generator under test 14.

[0061] In the above embodiments, such as Figure 5 As shown, when the control device tests the generator under test 14, the control switch S7 is closed, so that the AC power supply 70 provides excitation current to the generator under test 14 after being rectified by the third rectifier module, thereby realizing closed-loop regulation of the generator terminal voltage of the generator under test 14.

[0062] To ensure the normal operation of the second frequency converter, in one optional implementation, such as Figure 5 As shown, the second rectifier module 50 includes a second filter unit A2 and a second rectifier unit B2. The input terminal of the second filter unit A2 is electrically connected to the DC terminal of the second rectifier module 50, the output terminal of the second filter unit A2 is electrically connected to the AC terminal of the second rectifier unit B2, and the DC terminal of the second rectifier unit B2 is electrically connected to the DC high-voltage bus 40.

[0063] In the above embodiments, such as Figure 5 As shown, a second filter unit A2 is connected to the AC terminal of the second rectifier unit B2 to filter the AC power entering the second frequency converter 22, remove harmonics, and ensure the normal operation of the second frequency converter 22.

[0064] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0065] The testing system of this application includes a testing device comprising multiple test circuits, with one device under test (DUT) corresponding to one test circuit. Each test circuit includes a first test terminal and a second test terminal. A control device is also included, which controls the first target DUT to be electrically connected to the first target test terminal and the second target DUT to be electrically connected to the second target test terminal when testing the target DUT. The target DUT can be any one of the DUTs, the first target DUT is the first test terminal of the target DUT, the second target DUT is the second test terminal of the target DUT, the first target test terminal is the first test terminal of the target test circuit, and the second target test terminal is the second test terminal of the target test circuit. The target test circuit is the test circuit corresponding to the target DUT. One test circuit of the testing device in this system is used to test one type of DUT, and the multiple test circuits of the testing device enable the testing of multiple types of DUTs using the same testing device. This system solves the problem that traditional electric wheel test benches in the prior art cannot test different types of DUTs.

[0066] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A testing system, characterized in that, The testing system is used to test the performance parameters of multiple different types of devices under test (DUTs). Each DUT includes a first DUT and a second DUT. The testing system includes: The testing device includes multiple test circuits, one device under test corresponds to one test circuit, and one test circuit includes a first test terminal and a second test terminal. A control device is provided for controlling a first target device under test (DUT) to be electrically connected to a first target test terminal and a second target device under test (DUT) to be electrically connected to a second target test terminal when testing a target DUT. The target DUT is any one of the DUTs, the first target DUT is the first test terminal of the target DUT, the second target DUT is the second test terminal of the target DUT, the first target test terminal is the first test terminal of a target test circuit, the second target test terminal is the second test terminal of the target test circuit, and the target test circuit is the test circuit corresponding to the target DUT. The testing system also includes a power supply device, which further includes a first frequency converter, a second frequency converter, and a first auxiliary test device. The first auxiliary test device includes a first auxiliary test terminal and a second auxiliary test terminal. The first frequency converter includes a first rectifier module and a first inverter module, and the second frequency converter includes a second inverter module. The AC terminal of the first rectifier module is electrically connected to the power supply device, and the DC terminals of the first rectifier module, the first inverter module, and the second inverter module are all electrically connected to a DC high-voltage bus. The target device under test is a first electric shovel motor under test. The target test circuit includes the first frequency converter, the second frequency converter, and the first auxiliary test device. The control device is used to control the first auxiliary test terminal to be electrically connected to the AC terminal of the first inverter module, control the second auxiliary test terminal to be electrically connected to the first target test terminal, and control the AC terminal of the second inverter module to be electrically connected to the second target test terminal. The first auxiliary test device is used to load the first electric shovel motor under test.

2. The testing system according to claim 1, characterized in that, The testing device further includes a first transformer and a filter. The target device under test is a second electric shovel motor under test, the rated voltage of which is higher than that of the first electric shovel motor under test. The target test circuit includes a first frequency converter, a second frequency converter, a first auxiliary test device, the first transformer, and the filter. The control device is used to electrically connect the first auxiliary test terminal to the AC terminal of the first inverter module, control the second auxiliary test terminal to be electrically connected to the first target test terminal, control one end of the filter to be electrically connected to the AC terminal of the second inverter module, control the other end of the filter to be electrically connected to the low-voltage terminal of the first transformer, and control the high-voltage terminal of the first transformer to be electrically connected to the second target test terminal. The first auxiliary test device is used to load the second electric shovel motor under test.

3. The testing system according to claim 2, characterized in that, The testing device further includes a second auxiliary testing device, which includes a third auxiliary testing terminal and a fourth auxiliary testing terminal. The target device under test is a motor under test. The target test circuit includes the first frequency converter, the second frequency converter, the filter, the first transformer, and the second auxiliary testing device. The control device is used to control the third auxiliary testing terminal to be electrically connected to the AC terminal of the first inverter module, control the fourth auxiliary testing terminal to be electrically connected to the first target test terminal, control one end of the filter to be electrically connected to the AC terminal of the second inverter module, control the other end of the filter to be electrically connected to the low-voltage terminal of the first transformer, and control the high-voltage terminal of the first transformer to be electrically connected to the second target test terminal. The second auxiliary testing device is used to load or brake the motor under test.

4. The testing system according to claim 2, characterized in that, The second frequency converter also includes a second rectifier module. The first auxiliary test device includes a fifth auxiliary test terminal. The DC terminal of the second rectifier module is electrically connected to the DC high-voltage bus. The target device under test is a generator under test. The target test circuit includes the first frequency converter, the second frequency converter, the first transformer, and the first auxiliary test device. The control device is used to control the first auxiliary test terminal to be electrically connected to the AC terminal of the first inverter module, control the fifth auxiliary test terminal to be electrically connected to the first target test terminal, control the AC terminal of the second rectifier module to be electrically connected to the low-voltage terminal of the first transformer, control the high-voltage terminal of the first transformer to be electrically connected to the second target test terminal, and control the second auxiliary test terminal to be in a floating state. The first auxiliary test device is used to load the generator under test.

5. The testing system according to claim 4, characterized in that, The first auxiliary testing device further includes a first motor and a first capacitor. The first motor includes a first end and a second end. The first end is electrically connected to the first auxiliary testing end, the second end is electrically connected to one end of the first capacitor, and the other end of the first capacitor is electrically connected to the second auxiliary testing end.

6. The testing system according to claim 5, characterized in that, The first test device also includes a second capacitor, and the first motor also includes a third terminal, which is electrically connected to one end of the second capacitor, and the other end of the second capacitor is electrically connected to the fifth test terminal.

7. The testing system according to claim 3, characterized in that, The second auxiliary testing device further includes a second motor, a gearbox, a third capacitor, and a fourth capacitor. One end of the second motor is electrically connected to the third auxiliary testing end, the other end of the second motor is electrically connected to one end of the third capacitor, the other end of the third capacitor is electrically connected to one end of the gearbox, the other end of the gearbox is electrically connected to one end of the fourth capacitor, and the other end of the fourth capacitor is electrically connected to the fourth auxiliary testing end.

8. The testing system according to claim 1, characterized in that, The first rectifier module includes a first filter unit and a first rectifier unit. The input terminal of the first filter unit is electrically connected to the power supply device, the output terminal of the first filter unit is electrically connected to the AC terminal of the first rectifier unit, and the DC terminal of the first rectifier unit is electrically connected to the DC high-voltage bus.

9. The testing system according to claim 4, characterized in that, The second rectifier module includes a second filter unit and a second rectifier unit. The input terminal of the second filter unit is electrically connected to the DC terminal of the second rectifier module, the output terminal of the second filter unit is electrically connected to the AC terminal of the second rectifier unit, and the DC terminal of the second rectifier unit is electrically connected to the DC high-voltage bus.

10. The testing system according to claim 4, characterized in that, The testing device further includes a third rectifier module and an AC power supply. The generator under test also includes an excitation terminal, which is electrically connected to the DC terminal of the third rectifier module. The control device is used to control the AC power supply to be electrically connected to the AC terminal of the third rectifier module when testing the generator under test.

11. The testing system according to any one of claims 1 to 9, characterized in that, The testing system also includes a high-voltage power grid, and the power supply device also includes a second transformer. The control device is used to control the high-voltage end of the second transformer to be electrically connected to the high-voltage power grid when testing the target device under test, and to control the low-voltage end of the second transformer to be electrically connected to the AC end of the first rectifier module.

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