Double-dragging test device of brushless direct-current motor

Abstract

The utility model relates to the technical field of motor test devices, in particular to a twin-dragging test device of a brushless direct-current motor, which comprises a test box and a twin-dragging test assembly arranged in the test box. The device further comprises a nitrogen tank, and liquid nitrogen is stored in the nitrogen tank. A gas inlet is formed in one side plate of the test box, and the nitrogen tank is connected with the gas inlet through a pipeline and used for introducing liquid nitrogen into the test box; a heat dissipation plate is mounted on the bottom wall of an inner cavity of the test box, and a heater and a heat dissipation bracket are arranged on the heat dissipation plate; the heat dissipation bracket is covered on the heater; the twin-dragging test assembly is fixedly installed on the heat dissipation support. As the nitrogen tank is connected with the gas inlet through the pipeline, liquid nitrogen can be introduced into the test box, the temperature in the test box can be further adjusted, a low-temperature environment can be provided, and reliable conditions are provided for motor performance testing.

Description

Technical Field

[0001] This utility model relates to the technical field of motor testing devices, and in particular to a drag testing device for a brushless DC motor. Background Technology

[0002] With the continuous development of technology, ultra-low temperature brushless DC motors are increasingly widely used in aerospace, deep space exploration, and other fields. However, equipment capable of conducting tests in environments ranging from -183℃ to +127℃ is still relatively scarce and expensive.

[0003] The motor-drive test is an experimental method used to measure motor performance. It typically involves two motors: the motor under test (DUT) and the driving motor. The DUT acts as the power source, driving the driving motor, which in turn generates electricity. This method simulates the load conditions of the DUT under actual operation, allowing for the measurement of its performance parameters under different loads.

[0004] In the prior art, patent application CN220340356U discloses a motor drag durability test device, including a temperature chamber, drag test components, wiring harness, and cooling pipes, with the drag test components placed inside the temperature chamber.

[0005] Although the aforementioned prior art discloses placing the motor and its coupling shaft involved in the drag test within a temperature chamber, and using a cooling unit to supply a cooling medium with a specific flow rate and temperature to the motor stator through cooling pipes to complete the drag-rotation durability test of the entire motor, it does not disclose how the temperature chamber provides a low-temperature environment to meet the requirements of ultra-low temperature (-183℃) testing. Utility Model Content

[0006] The main purpose of this invention is to provide a drag test device for a brushless DC motor, which aims to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, this utility model proposes a drag test device for a brushless DC motor, comprising a test chamber and a drag test assembly disposed inside the test chamber; it also includes a nitrogen tank containing liquid nitrogen; an air inlet is provided on one side plate of the test chamber, and the nitrogen tank is connected to the air inlet via a pipe for introducing liquid nitrogen into the test chamber; a heat dissipation plate is installed on the bottom wall of the inner cavity of the test chamber, and a heater and a heat dissipation bracket are provided on the heat dissipation plate; the heat dissipation bracket covers the heater; and the drag test assembly is fixedly mounted on the heat dissipation bracket.

[0008] Preferably, the bottom plate, top plate, and four side plates of the test chamber are all double-layered structures, with the outer layer being an aluminum plate and the inner layer being an insulation board.

[0009] Preferably, the insulation board is a polyimide glass cloth board.

[0010] Preferably, the bottom plate of the test chamber is connected to the surrounding side plates by screws, and the joint between the bottom plate and the surrounding side plates is coated with silicone rubber.

[0011] Preferably, the top plate of the test chamber is connected to the surrounding side plates by latches, and the joints between the top plate and the surrounding side plates are coated with silicone rubber.

[0012] Preferably, the drag test assembly includes a test motor, a load motor, and a base plate; a drag frame is vertically mounted on the top surface of the base plate; the test motor is mounted on the left side plate of the drag frame; the load motor is mounted on the right side plate of the drag frame; and the shaft of the test motor and the shaft of the load motor are connected by a coupling.

[0013] Preferably, a first electrical connector is provided on the left side panel of the test chamber; a second electrical connector is provided on the right side panel of the test chamber; the lead wire of the tested motor is connected to the first electrical connector; and the lead wires of the load motor and the heater are connected to the second electrical connector.

[0014] Preferably, the load motor is connected to the electronic load via an inverter.

[0015] Preferably, the lead wires of the tested motor are connected to the first electrical connector by welding; the lead wires of the load motor and the heater are connected to the second electrical connector by welding.

[0016] Preferably, a temperature control valve is installed on the pipeline between the nitrogen tank and the air inlet, and a temperature sensor is inserted into the left side plate of the test chamber to monitor the temperature inside the chamber in real time and feed it back to the temperature control valve.

[0017] Due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows:

[0018] (1) In this utility model, since the nitrogen tank is connected to the air inlet through a pipe, it can be used to introduce liquid nitrogen into the test chamber, thereby adjusting the temperature inside the test chamber and providing a low-temperature environment, which provides reliable conditions for motor performance testing.

[0019] (2) The low-temperature properties of liquid nitrogen enable it to rapidly absorb heat, thereby achieving a rapid decrease in temperature within the test chamber. Compared to other cooling methods, such as mechanical refrigeration systems, liquid nitrogen cools faster and can reach the required low-temperature environment in a short time. It is suitable for motor-to-motor drag tests that require rapid cooling.

[0020] (3) Liquid nitrogen is relatively simple to use and does not require complex refrigeration equipment and control systems. Simply fill the test chamber with liquid nitrogen to achieve rapid cooling. This method is very convenient in laboratory environments, especially suitable for occasions where a temporary or rapid cryogenic environment needs to be established. In addition, the storage and transportation of liquid nitrogen is also relatively easy, and it can usually be stored and transported using dedicated liquid nitrogen tanks.

[0021] (4) The drag test device provided by this utility model has a simple structure, is easy to implement, easy to operate, and has low cost. It can effectively and quickly solve the problems of difficult ultra-low temperature testing and temperature cycling testing. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the test chamber and its internal drag test components in this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the drag test assembly in this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the test chamber in this utility model;

[0026] Figure 4 This is a schematic diagram of the circuit connection principle of this utility model.

[0027] Reference numerals: 1. Test chamber; 1a. Aluminum plate; 1b. Insulation board; 2. Test assembly; 201. Test motor; 202. Load motor; 203. Base plate; 204. Test frame; 205. Coupling; 206. Connecting plate; 3. Air inlet; 4. Nitrogen tank; 5. Heat sink; 6. Heater; 7. Heat sink bracket; 8. Locking buckle; 9. First electrical connector; 10. Second electrical connector; 11. Temperature sensor; 12. Temperature control valve. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0030] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0031] Combination Figures 1 to 4 As shown, a drag test device for a brushless DC motor includes a test chamber 1 and a drag test assembly 2 disposed inside the test chamber 1; it also includes a nitrogen tank 4 containing liquid nitrogen; an air inlet 3 is provided on one side plate of the test chamber 1, and the nitrogen tank 4 is connected to the air inlet 3 via a pipe for introducing liquid nitrogen into the test chamber 1; a heat dissipation plate 5 is installed on the bottom wall of the inner cavity of the test chamber 1, and a heater 6 and a heat dissipation bracket 7 are provided on the heat dissipation plate 5; the heat dissipation bracket 5 covers the heater 4; the drag test assembly 2 is fixedly installed on the heat dissipation bracket 5, which serves both as a heat dissipation device and as a mounting device for the drag test assembly 2.

[0032] Since the nitrogen tank 4 is connected to the air inlet 3 via a pipe, it can be used to introduce liquid nitrogen into the test chamber 1, thereby regulating the temperature inside the test chamber 1 and providing a low-temperature environment, thus providing reliable conditions for motor performance testing. Liquid nitrogen has a boiling point of approximately -196°C at standard atmospheric pressure, which can quickly lower the temperature inside the test chamber 1 to an extremely low level, meeting the ultra-low temperature requirement of -183°C. The heater 6 can be used to heat the test chamber 1. In this embodiment, the operating temperature range of the test chamber 1 is -183°C to +127°C.

[0033] In this embodiment, nitrogen tank 4 and heater 6 are used to cool and heat the test chamber, which can accurately simulate the ultra-low temperature environment and provide reliable conditions for motor performance testing.

[0034] Combination Figure 1As shown, the bottom plate, top plate, and four side plates of the test chamber 1 are all double-layered structures. The outer layer is an aluminum plate 1a, and the inner layer is an insulation board 1b. The insulation board 1b improves the thermal insulation performance of the test chamber 1. Furthermore, the insulation board 1b is a polyimide glass cloth board. Polyimide glass cloth boards can maintain structural and performance stability under extreme high-temperature environments, with a long-term operating temperature exceeding 200℃ and a short-term operating temperature reaching 500℃ or even higher. Under high-temperature conditions, the polyimide glass cloth board has a low coefficient of thermal expansion, effectively reducing thermal stress caused by temperature changes, thereby improving the reliability of its thermal insulation performance. Polyimide glass cloth boards can maintain good performance at extremely low temperatures, with a low-temperature resistance range down to -269℃.

[0035] In this embodiment, the bottom plate of the test chamber 1 is connected to the surrounding side plates by screws, and the seam between the bottom plate and the surrounding side plates is coated with silicone rubber. Furthermore, the top plate of the test chamber 1 is connected to the surrounding side plates by latches 8, and the seam between the top plate and the surrounding side plates is coated with silicone rubber. The purpose of applying silicone rubber is to provide a sealing effect. The latches 8 connecting the top plate to the surrounding side plates facilitate the opening and closing of the top plate.

[0036] Combination Figure 1 and Figure 2 As shown, the drag test assembly 2 includes a test motor 201, a load motor 202, and a base plate 203. A drag frame 204 is vertically mounted on the top surface of the base plate 203. The base plate 203 is bolted to the heat dissipation bracket 7 (not shown in the figure). The test motor 201 is mounted on the left side plate of the drag frame 204. The load motor 202 is fastened to the right side plate of the drag frame 204 with screws. The shaft of the test motor 201 and the shaft of the load motor 202 are connected by a coupling 205. Specifically, the test motor 201 is mounted on the left side plate of the drag frame 204 via a connecting plate 206. The connecting plate 206 is connected to the test motor 201 with screws, and the connecting plate 206 is also connected to the left side plate of the drag frame 204 with screws. The base plate 203 is fastened to the drag frame 204 with screws.

[0037] Combination Figure 1 As shown, a first electrical connector 9 is provided on the left side plate of the test chamber 1; a second electrical connector 10 is provided on the right side plate of the test chamber 1; the lead wire of the test motor 201 is connected to the first electrical connector 9 by welding; the lead wires of the load motor 202 and the heater 6 are connected to the second electrical connector 10 by welding.

[0038] Combination Figure 4As shown, the load motor 202 is connected to the electronic load via an inverter to simulate different load conditions.

[0039] In this embodiment, a temperature control valve 12 is installed on the pipeline between the nitrogen tank 4 and the air inlet 3; a temperature sensor 11 is inserted into the left side plate of the test chamber 1 to monitor the temperature inside the chamber in real time and feed it back to the temperature control valve 12. The temperature control valve 12 controls the amount of nitrogen injected, thereby controlling the temperature inside the test chamber 1. Furthermore, the drag test device also includes a temperature controller. The temperature sensor 11 is connected to the heater 6, and the temperature sensor 11 monitors the temperature inside the chamber in real time and feeds it back to the temperature controller. The heater 6 can be a resistance heater. The temperature control valve 12 and the temperature controller are conventional control devices and will not be described in detail here.

[0040] Combination Figure 4 As shown, connect the motor controller to the motor under test 201, connect the motor controller to the power supply, and connect it to the computer. Connect the nitrogen tank 4 to the air inlet 2 of the test chamber 1 through a pipeline. Connect the temperature sensor 11 to the temperature control valve 12 and the temperature controller of the heater 6. Connect the heater 6 to the heating power supply. Connect the load motor 202 to the inverter and connect it to the electronic load. Power on the motor for joint testing. After the motor test is normal, fasten the top plate of the test chamber 1 with the latch 8, and the test can be carried out.

[0041] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A drag test device for a brushless DC motor, comprising a test chamber (1) and a drag test assembly (2) disposed inside the test chamber (1); characterized in that, It also includes a nitrogen tank (4) containing liquid nitrogen; An air inlet (3) is provided on one side panel of the test chamber (1), and the nitrogen tank (4) is connected to the air inlet (3) through a pipe for introducing liquid nitrogen into the test chamber (1); A heat dissipation plate (5) is installed on the bottom wall of the inner cavity of the test chamber (1), and a heater (6) and a heat dissipation bracket (7) are provided on the heat dissipation plate (5); the heat dissipation bracket (5) covers the heater (4); The drag test assembly (2) is fixedly installed on the heat dissipation bracket (5).

2. The drag test device for a brushless DC motor as described in claim 1, characterized in that, The bottom plate, top plate and four side plates of the test chamber (1) are all double-layered structures, with the outer layer being an aluminum plate (1a) and the inner layer being an insulation board (1b).

3. The drag test device for a brushless DC motor as described in claim 2, characterized in that, The insulation board (1b) is a polyimide glass cloth board.

4. The drag test device for a brushless DC motor as described in claim 1, characterized in that, The bottom plate of the test chamber (1) is connected to the side plates around the perimeter by screws, and the joint between the bottom plate and the side plates around the perimeter is coated with silicone rubber.

5. The drag test device for a brushless DC motor as described in claim 1, characterized in that, The top plate of the test chamber (1) is connected to the side plates of the surrounding area by latches (8), and the joint between the top plate of the test chamber (1) and the side plates of the surrounding area is coated with silicone rubber.

6. The drag test device for a brushless DC motor as described in claim 1, characterized in that, The drag test assembly (2) includes a test motor (201), a load motor (202), and a base plate (203); A pair of brackets (204) are vertically installed on the top surface of the base plate (203); The test motor (201) is mounted on the left side plate of the pair of carriages (204); The load motor (202) is mounted on the right side plate of the pair of carriages (204); The shaft of the test motor (201) is connected to the shaft of the load motor (202) via a coupling (205).

7. The drag test device for a brushless DC motor as described in claim 6, characterized in that, A first electrical connector (9) is provided on the left side panel of the test chamber (1); A second electrical connector (10) is provided on the right side panel of the test chamber (1); The lead wire of the test motor (201) is connected to the first electrical connector (9); The leads of the load motor (202) and heater (6) are connected to the second electrical connector (10).

8. The drag test device for a brushless DC motor as described in claim 6, characterized in that, The load motor (202) is connected to the electronic load via an inverter.

9. The drag test device for a brushless DC motor as described in claim 7, characterized in that, The lead wires of the tested motor (201) are connected to the first electrical connector (9) by welding; The lead wires of the load motor (202) and heater (6) are connected to the second electrical connector (10) by welding.

10. The drag test device for a brushless DC motor as described in claim 1, characterized in that, A temperature control valve (12) is installed on the pipeline between the nitrogen tank (4) and the air inlet (3); A temperature sensor (11) is installed on the left side plate of the test chamber (1) to monitor the temperature inside the chamber in real time and feed it back to the temperature control valve (12).

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