High-voltage motor coaxial twin-trawling test system

Abstract

The utility model discloses a high-voltage motor coaxial twin-trawling test system, and relates to the technical field of motor control, the high-voltage motor coaxial twin-trawling test system comprises a to-be-tested motor driver, a test motor, a load motor driver, a load motor and a torque rotating speed sensor, the high-voltage motor coaxial twin-trawling test system comprises a low-voltage power supply and a high-voltage adjustable test power supply; the high-voltage adjustable test power supply is obtained by boosting a low-voltage power supply; the high-voltage input ends of the to-be-tested motor driver and the load motor driver are connected to the high-voltage adjustable test power supply. The to-be-tested motor driver is a to-be-tested variable frequency driver, and the load motor driver is a feedback driver; and part of electric energy of the high-voltage adjustable test power supply is fed back by the load motor driver. The coaxial twin-trawling test system for the high-voltage motor solves the problem that motor output characteristic detection cannot be normally carried out when the motor to be detected is a high-voltage motor.

Description

Technical Field

[0001] The present application relates to the technical field of motor control, and in particular to a high-voltage motor coaxial towing test system. Background Art

[0002] At present, various performance indicators of variable frequency speed regulation products need to be evaluated in the early stage of product development, such as the rated torque of the motor output in each output frequency range, the torque control accuracy of the driver, and the vector control of the driver. Among them, various performance indicators of the product need to be evaluated in the early stage of motor development.

[0003] In related technologies, to evaluate the performance indicators of the motor under test, it is necessary to provide the motor under test with loads of various sizes to detect the output characteristics of the motor. Traditional technical solutions often use turbines, DC motors, etc. as adjustable loads.

[0004] However, the load power that traditional technical solutions can provide is relatively small and cannot meet the actual test requirements of high power or ultra-high power. When the motor to be tested is a high-voltage motor, it is basically impossible to perform normal motor output characteristic detection. Summary of the invention

[0005] In view of the defects existing in the prior art, the purpose of the present application is to provide a high-voltage motor coaxial drag test system to solve the problem that the motor output characteristics cannot be properly detected when the motor to be tested is a high-voltage motor.

[0006] In order to achieve the above purpose, the technical scheme adopted is: a high-voltage motor coaxial towing test system, including a motor driver to be tested, a test motor, a load motor driver, a load motor and a torque and speed sensor, the high-voltage motor coaxial towing test system includes a low-voltage power supply and a high-voltage adjustable test power supply; the high-voltage adjustable test power supply is obtained by boosting the low-voltage power supply; the high-voltage input ends of the motor driver to be tested and the load motor driver are both connected to the high-voltage adjustable test power supply;

[0007] The motor driver to be tested is a variable frequency driver to be tested, and the load motor driver is a feedback driver; part of the electric energy of the high-voltage adjustable test power supply comes from the feedback of the load motor driver.

[0008] On the basis of the above technical solution, the high-voltage motor coaxial towing test system includes a three-phase isolation transformer, and the low-voltage power supply is connected to the high-voltage adjustable test power supply through the three-phase isolation transformer.

[0009] On the basis of the above technical solution, the high-voltage motor coaxial towing test system includes a three-phase voltage regulator, and the low-voltage power supply is connected to the high-voltage adjustable test power supply through a three-phase isolation transformer and a three-phase voltage regulator.

[0010] Based on the above technical solution, the low-voltage power supply comes from the external 380V power distribution network.

[0011] On the basis of the above technical solution, during the motor output characteristic detection process, the test motor and the load motor have the same rotation direction, the output torque of the load motor driver is used as the input quantity, and the output characteristics of the motor driver to be tested are used as the detection quantity.

[0012] On the basis of the above technical solution, the high-voltage motor coaxial towing test system includes a plurality of high-voltage three-phase distribution switches, and high-voltage three-phase distribution switches are provided for the lines between the motor driver to be tested and the high-voltage adjustable test power supply, the lines between the load motor driver and the high-voltage adjustable test power supply, and the connection lines between the low-voltage power supply and the high-voltage adjustable test power supply.

[0013] On the basis of the above technical solution, the load motor driver is a four-quadrant feedback drive device.

[0014] On the basis of the above technical solution, the motor driver to be tested is connected to the test motor, and the load motor driver is connected to the load motor.

[0015] On the basis of the above technical solution, the test motor and the load motor are coaxially connected via a torque and speed sensor.

[0016] On the basis of the above technical solution, the test motor and the load motor have the same power and the same number of poles.

[0017] The beneficial effects of the technical solution provided by this application include:

[0018] 1. The high-voltage motor coaxial towing test system of the present application uses a high-voltage adjustable test power supply to simultaneously power the motor driver to be tested and the load motor driver. The high-voltage adjustable test power supply is adjustable and can supply different voltage segments. In the process of detecting the output characteristics of the motor, the output torque of the load motor driver can be adjusted to meet the load test requirements of the motor driver to be tested and the test motor. The output characteristics detection can be specifically performed on the high-voltage motor, solving the problem that the motor output characteristics detection cannot be performed normally when the motor to be tested is a high-voltage motor. The motor driver to be tested and the load motor driver share the same high-voltage power supply, namely the high-voltage adjustable test power supply. When the load motor is in the power generation state, the generated electric energy is directly fed back to the high-voltage adjustable test power supply through the load motor driver. The input end of the motor driver to be tested can directly use this part of the generated energy, effectively reducing the power consumption, saving energy and reducing costs.

[0019] 2. In the high-voltage motor coaxial towing test system of the present application, the low-voltage power supply is connected to the high-voltage adjustable test power supply through a three-phase isolation transformer. While the high-voltage adjustable test power supply is regulating the voltage, it is isolated from the low-voltage power supply by the three-phase isolation transformer, which can effectively reduce grid harmonics. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic diagram of a high-voltage motor coaxial towing test system provided in an embodiment of the present application.

[0022] Figure numerals: 1. Motor driver to be tested; 2. Test motor; 3. Load motor driver; 4. Load motor; 5. Torque and speed sensor; 6. Low-voltage power supply; 7. High-voltage adjustable test power supply; 8. Three-phase voltage regulator; 9. Three-phase isolation transformer. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present application clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] The present application discloses a high-voltage motor coaxial drag test system to solve the problem that the motor output characteristic detection cannot be performed normally when the motor to be tested is a high-voltage motor.

[0025] like Figure 1 As shown, the present application discloses an embodiment of a high-voltage motor coaxial towing test system, which includes a motor driver 1 to be tested, a test motor 2, a load motor driver 3, a load motor 4 and a torque speed sensor 5. The motor driver 1 to be tested is connected to the test motor 2, and the test motor 2 is driven by the motor driver 1 to be tested; the load motor driver 3 is connected to the load motor 4, and the load motor 4 is driven by the load motor driver 3. The test motor 2 and the load motor 4 are coaxially connected through the torque speed sensor 5.

[0026] In the high-voltage motor coaxial towing test system, after the test motor 2 and the load motor 4 are started in the same direction, the output torque of the load motor driver 3 is adjusted to meet the load test requirements of the motor driver 1 to be tested and the test motor 2.

[0027] The high-voltage motor coaxial towing test system comprises a low-voltage power supply 6 and a high-voltage adjustable test power supply 7 ; the high-voltage adjustable test power supply 7 is obtained by boosting the low-voltage power supply 6 .

[0028] The high voltage input terminals of the motor driver 1 to be tested and the load motor driver 3 are both connected to the high voltage adjustable test power supply 7. The high voltage adjustable test power supply 7 is a three-phase power supply, and the motor driver 1 to be tested and the load motor driver 3 share the same three-phase adjustable high voltage power supply.

[0029] The test motor 2 and the load motor 4 have the same power and the same number of poles, which makes it easier to match the motor's measurement characteristics, reducing the difficulty of the test. The motor driver 1 to be tested is a variable frequency driver to be tested, and the load motor driver 3 is a feedback driver; part of the power of the high-voltage adjustable test power supply 7 also comes from the feedback of the load motor driver 3.

[0030] The high-voltage motor coaxial towing test system of the present application uses a high-voltage adjustable test power supply 7 to simultaneously power the motor driver 1 to be tested and the load motor driver 3. The high-voltage adjustable test power supply 7 is adjustable and can supply different voltage segments. During the motor output characteristic detection process, the load test requirements of the motor driver 1 to be tested and the test motor 2 can be met by adjusting the output torque of the load motor driver 3, thereby solving the problem that the motor output characteristic detection cannot be performed normally when the motor to be tested is a high-voltage motor.

[0031] The motor driver 1 to be tested and the load motor driver 3 share the same high-voltage power supply, namely, the high-voltage adjustable test power supply 7. When the load motor 4 is in the power generation state, the generated electric energy is directly fed back to the high-voltage adjustable test power supply 7 through the load motor driver 3. The input end of the motor driver 1 to be tested can directly use this part of the generated energy, effectively reducing the power consumption, saving energy and reducing costs.

[0032] Specifically, the purpose of the towing test is to comprehensively evaluate the output characteristics of the motor under load conditions, including torque-speed characteristics, power characteristics, etc. Through data analysis of the towing test, the performance curve of the test motor 2 under different loads can be determined, and the rated operating conditions of the motor can be found, which is of great significance for the selection and application of the motor.

[0033] In one embodiment, the high-voltage motor coaxial towing test system includes a three-phase isolation transformer 9 , and the low-voltage power supply 6 is connected to the high-voltage adjustable test power supply 7 through the three-phase isolation transformer 9 .

[0034] In the high-voltage motor coaxial towing test system of the present application, the low-voltage power supply 6 is connected to the high-voltage adjustable test power supply 7 through the three-phase isolation transformer 9. While the high-voltage adjustable test power supply 7 is regulating the voltage, it is isolated from the low-voltage power supply 6 by the three-phase isolation transformer 9, which can effectively reduce grid harmonics.

[0035] Furthermore, the high-voltage motor coaxial towing test system includes a three-phase voltage regulator 8, and the low-voltage power supply 6 is connected to the high-voltage adjustable test power supply 7 through a three-phase isolation transformer 9 and the three-phase voltage regulator 8.

[0036] Specifically, the three-phase isolation transformer 9 and the three-phase voltage regulator 8 are simultaneously arranged between the low-voltage power supply 6 and the high-voltage adjustable test power supply 7. The three-phase isolation transformer 9 can isolate the low-voltage power supply 6 and the high-voltage adjustable test power supply 7 on the basis of voltage regulation, and the three-phase voltage regulator 8 can perform specified voltage regulation to achieve different output characteristics. The combination of the three-phase isolation transformer 9 and the three-phase voltage regulator 8 can achieve a good voltage regulation effect.

[0037] Preferably, the low voltage power supply 6 is derived from the external 380V power distribution network. The three-phase isolation transformer 9 can isolate the high voltage adjustable test power supply 7 from the external network, effectively reducing the grid harmonics.

[0038] In one embodiment, during the motor output characteristic detection process, the test motor 2 and the load motor 4 rotate in the same direction. The output torque of the load motor driver 3 is used as the input quantity, and the output characteristics of the motor driver to be tested are used as the detection quantity.

[0039] Specifically, the high-voltage motor coaxial towing test system detects the output characteristics of the test motor 2 by adjusting the output torque of the load motor driver 3 .

[0040] In one embodiment, a high-voltage motor coaxial towing test system includes a plurality of high-voltage three-phase distribution switches, and high-voltage three-phase distribution switches are provided for the lines between the motor driver 1 to be tested and the high-voltage adjustable test power supply 7, the lines between the load motor driver 3 and the high-voltage adjustable test power supply 7, and the connection lines between the low-voltage power supply 6 and the high-voltage adjustable test power supply 7.

[0041] Furthermore, the load motor driver 3 is a four-quadrant feedback driving device.

[0042] Specifically, in the high-voltage motor coaxial towing test system, the motor driver 1 to be tested is connected to the test motor 2 , and the load motor driver 3 is connected to the load motor 4 .

[0043] Specifically, in the high-voltage motor coaxial drag test system, the test motor 2 and the load motor 4 are coaxially connected via a torque and speed sensor 5 .

[0044] Preferably, the test motor 2 and the load motor 4 have the same power and the same number of poles, which can make it easier to match the measurement characteristics of the motors, thereby reducing the difficulty of the motor output characteristic detection test.

[0045] The high-voltage motor coaxial towing test system of the present application uses a high-voltage adjustable test power supply 7 to simultaneously power the motor driver 1 to be tested and the load motor driver 3. The high-voltage adjustable test power supply 7 is adjustable and can supply different voltage segments. During the motor output characteristic detection process, the load test requirements of the motor driver 1 to be tested and the test motor 2 can be met by adjusting the output torque of the load motor driver 3, thereby solving the problem that the motor output characteristic detection cannot be performed normally when the motor to be tested is a high-voltage motor.

[0046] The motor driver 1 to be tested and the load motor driver 3 share the same high-voltage power supply, namely, the high-voltage adjustable test power supply 7. When the load motor 4 is in the power generation state, the generated electric energy is directly fed back to the high-voltage adjustable test power supply 7 through the load motor driver 3. The input end of the motor driver 1 to be tested can directly use this part of the generated energy, effectively reducing the power consumption, saving energy and reducing costs.

[0047] In the high-voltage motor coaxial towing test system of the present application, the low-voltage power supply 6 is connected to the high-voltage adjustable test power supply 7 through the three-phase isolation transformer 9. While the high-voltage adjustable test power supply 7 is regulating the voltage, it is isolated from the low-voltage power supply 6 by the three-phase isolation transformer 9, which can effectively reduce grid harmonics.

[0048] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0049] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0050] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A high-voltage motor coaxial towing test system, comprising a motor driver to be tested (1), a test motor (2), a load motor driver (3), a load motor (4) and a torque and speed sensor (5), characterized in that: The high-voltage motor coaxial towing test system comprises a low-voltage power supply (6) and a high-voltage adjustable test power supply (7); the high-voltage adjustable test power supply (7) is obtained by boosting the low-voltage power supply (6); the high-voltage input ends of the motor driver to be tested (1) and the load motor driver (3) are both connected to the high-voltage adjustable test power supply (7); The motor driver to be tested (1) is a variable frequency driver to be tested, and the load motor driver (3) is a feedback driver; part of the electric energy of the high-voltage adjustable test power supply (7) comes from the feedback of the load motor driver (3).

2. A high-voltage motor coaxial towing test system as claimed in claim 1, characterized in that: The high-voltage motor coaxial towing test system comprises a three-phase isolation transformer (9), and the low-voltage power supply (6) is connected to the high-voltage adjustable test power supply (7) via the three-phase isolation transformer (9).

3. A high-voltage motor coaxial towing test system as claimed in claim 2, characterized in that: The high-voltage motor coaxial towing test system comprises a three-phase voltage regulator (8), and the low-voltage power supply (6) is connected to the high-voltage adjustable test power supply (7) via a three-phase isolation transformer (9) and the three-phase voltage regulator (8).

4. A high-voltage motor coaxial towing test system as claimed in claim 1, characterized in that: The low voltage power supply (6) is derived from the external 380V power distribution network.

5. A high-voltage motor coaxial towing test system as claimed in claim 1, characterized in that: During the motor output characteristic detection process, the test motor (2) and the load motor (4) rotate in the same direction, the output torque of the load motor driver (3) is used as an input quantity, and the output characteristics of the motor driver to be tested are used as detection quantities.

6. A high-voltage motor coaxial towing test system as claimed in claim 1, characterized in that: The high-voltage motor coaxial towing test system comprises a plurality of high-voltage three-phase distribution switches, wherein the line between the motor driver to be tested (1) and the high-voltage adjustable test power supply (7), the line between the load motor driver (3) and the high-voltage adjustable test power supply (7), and the connection line between the low-voltage power supply (6) and the high-voltage adjustable test power supply (7) are all provided with high-voltage three-phase distribution switches.

7. A high-voltage motor coaxial towing test system as claimed in claim 1, characterized in that: The load motor driver (3) is a four-quadrant feedback driving device.

8. A high-voltage motor coaxial towing test system as claimed in claim 1, characterized in that: The motor driver to be tested (1) is connected to the test motor (2), and the load motor driver (3) is connected to the load motor (4).

9. A high-voltage motor coaxial towing test system as claimed in claim 1, characterized in that: The test motor (2) and the load motor (4) are coaxially connected via a torque and speed sensor (5).

10. A high-voltage motor coaxial towing test system according to any one of claims 1 to 9, characterized in that: The test motor (2) and the load motor (4) have the same power and the same number of poles.

Images