Motor air cooling heat dissipation evaluation device and motor air cooling heat dissipation evaluation method

Abstract

A device and method for evaluating the air-cooling and heat dissipation of a motor, the device comprising: a mounting stand, a fixed support arranged on the mounting stand, a rotating shaft rotatably arranged on the fixed support, a first transmission assembly arranged at one end of the rotating shaft, a transmission shaft dynamically connected to the rotating shaft via the first transmission assembly, a mounting stand for a motor to be tested and an adjustable load device arranged on the mounting stand, the adjustable load device dynamically connected to the transmission shaft via a second transmission assembly. In the device for evaluating the air-cooling and heat dissipation of a motor provided by the present invention, two sets of transmission assemblies are arranged, and the rotating motion and torque of the motor to be tested are outputted by using the rotating shaft and the transmission shaft. By designing the layout of the rotating shaft and the transmission shaft, the adjustable load device can be reasonably installed on the mounting stand, thereby avoiding the influence of the adjustable load device on the air-cooling airflow of the motor to be tested, and achieving the purpose of improving the reliability of the test data of the motor to be tested.

Description

Technical Field

[0001] The present invention relates to the technical field of motor evaluation equipment, and more specifically, to a motor air-cooling heat dissipation evaluation device and a motor air-cooling heat dissipation evaluation method. Background Art

[0002] Electric aircraft, high-altitude drones, stratospheric airships, etc. are all flying devices that use high-efficiency motors to drive propellers to provide flight power for the aircraft. High-efficiency motors used in electric aircraft, high-altitude drones, and stratospheric airships need to be loaded during the research and development and manufacturing process. In the loading test, it is mainly to assess the speed, torque, temperature rise and other items of the motor under the specified working conditions.

[0003] There are usually two testing methods for high efficiency motors:

[0004] One is to conduct the test in a test environment that simulates actual working conditions. Figure 1 , Figure 1 The following is a schematic diagram of the structure of a motor loading test device in the prior art. In this test method, the motor is set in a simulated wind tunnel, and then the temperature, air pressure and test wind speed of the simulated wind tunnel are adjusted. The motor drives the actual propeller to rotate, and then the test equipment detects the tension and the corresponding temperature and temperature rise of the motor at the set speed. In the above test method, since an actual propeller is used for testing, and the propeller is large in size, a larger test environment is required, which will cause the problem of high test costs. In addition, the test results are also test data with the propeller, and the test data of the motor itself cannot be separated, resulting in a large deviation in the experimental data.

[0005] Another test method is to replace the above propeller with a torque load generator, please refer to Figure 2 , Figure 2 This is a structural diagram of another motor loading test device in the prior art. In this method, a speed and torque sensor is installed between the motor and the load generator to test the speed, torque and corresponding temperature and temperature rise of the motor at different speeds. This simulation test method can be carried out in a smaller space, which overcomes the problems brought about by the first method mentioned above. However, there are still certain defects in this method. For example, if the tail direction of the motor under test is facing the direction of the cooling air flow, it is inconsistent with the state during actual use; if the front of the motor under test is facing the direction of the cooling air flow, the load device will block the front of the motor under test, which will affect the heat dissipation of the motor. Therefore, the motor temperature and temperature rise test results obtained by testing with this device are often inconsistent with the actual working conditions, affecting the accuracy of the test results under the air-cooled environment of the motor. Summary of the invention

[0006] The object of the present invention is to provide a motor loading evaluation device capable of performing high-precision evaluation on the air-cooling and heat dissipation condition of the motor.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] The invention provides a motor air-cooling heat dissipation evaluation device, which is used for performing performance testing on a motor under test.

[0009] In the present invention, the motor air cooling heat dissipation evaluation device comprises:

[0010] A mounting frame, wherein the upper side of the mounting frame is a test surface, and the lower side of the mounting frame is a transmission surface;

[0011] A fixed bracket disposed on the test surface and used for mounting a rotating shaft, a rotating shaft being rotatably disposed on the fixed bracket, one end of the rotating shaft being a connecting end for connecting with a motor shaft of a motor under test, a first transmission assembly being disposed at the other end of the rotating shaft, a transmission shaft being connected to the rotating shaft through the first transmission assembly, the transmission shaft being rotatably disposed on the transmission surface, and an axis of the transmission shaft being parallel to an axis of the rotating shaft;

[0012] A motor mounting frame for testing, which is arranged on the test surface and is used for mounting the motor for testing, and the motor mounting frame for testing can slide along the axis direction of the rotating shaft;

[0013] An adjustable load device is arranged on the mounting platform, and the adjustable load device is dynamically connected to the transmission shaft through a second transmission assembly.

[0014] Preferably, in the electric motor air-cooling heat dissipation evaluation device provided by the present invention, the present invention also includes an axial force applying component, the axial force applying component includes a fixing device, a tension sensor, and an axial force applying cable, the fixing device is fixedly arranged on the test surface, the tension sensor is connected to the fixing device, one end of the axial force applying cable is connected to the mounting frame of the motor under test, and the other end of the axial force applying cable is connected to the tension sensor.

[0015] Preferably, in the electric motor air-cooling heat dissipation evaluation device provided by the present invention, a control device capable of performing speed and torque tests on the adjustable load device is signal-connected to the adjustable load device.

[0016] Preferably, in the electric motor air-cooling heat dissipation evaluation device provided by the present invention, a shaft end bracket is provided at each end of the transmission shaft, the shaft end bracket is fixedly provided on the transmission surface, and the transmission shaft is rotatably provided on the transmission surface through the shaft end bracket.

[0017] Preferably, in the electric motor air-cooling heat dissipation evaluation device provided by the present invention, a shaft sleeve is provided at the top end of the fixed bracket, the rotating shaft is rotatably provided in the shaft sleeve, and the rotating shaft is rotatably provided on the fixed bracket through the shaft sleeve.

[0018] The present invention also provides a method for evaluating the air-cooling and heat dissipation of a motor. The method for evaluating the air-cooling and heat dissipation of a motor uses the above-mentioned air-cooling and heat dissipation evaluation device for a motor to test the air-cooling and heat dissipation of the motor.

[0019] Specifically, the present invention transmits the load of the tested motor to an adjustable load device installed at the rear end through a transmission shaft, so that the tested motor can obtain the required load while its windward area is not blocked, which is used to simulate the real load under air cooling conditions.

[0020] Specifically, in the air-cooling heat dissipation evaluation method for an electric motor provided by the present invention, the adjustable load device includes a motor torque and speed test instrument, and the motor torque and speed test instrument is connected to the transmission shaft.

[0021] Specifically, in the air-cooling heat dissipation evaluation method for an electric motor provided by the present invention, the adjustable load device includes a load motor calibrated with a motor-load relationship, and the load motor is connected to the transmission shaft.

[0022] Through the above-mentioned structural design, in the electric motor air-cooling and heat dissipation evaluation device provided by the present invention, two sets of transmission components are provided, and the rotational motion and torque of the motor under test are output by using the rotating shaft and the transmission shaft. Through the layout design of the rotating shaft and the transmission shaft, the adjustable load device can be reasonably installed on the mounting stand, thereby avoiding the influence of the adjustable load device on the air-cooling airflow of the motor under test, thereby achieving the purpose of improving the reliability of the test data of the motor under test. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0024] Figure 1 A schematic diagram of the structure of a motor loading test device in the prior art;

[0025] Figure 2 A schematic diagram of another motor loading test device in the prior art;

[0026] Figure 3 It is a structural schematic diagram of a motor air-cooling heat dissipation evaluation device in one embodiment of the present invention;

[0027] exist Figure 3 In the figure, the corresponding relationship between the component names and the reference numerals is as follows:

[0028] Mounting stand 1, fixed bracket 2, rotating shaft 3, first transmission assembly 4, transmission shaft 5,

[0029] The motor mounting frame 6, the adjustable load device 7, the second transmission assembly 8, the fixing device 9,

[0030] Tension sensor 10, axial force application cable 11, measured motor 12, coupling 13,

[0031] Shaft end bracket 14 and shaft sleeve 15. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention encompasses such modifications and variations within the scope of the appended claims and their equivalents.

[0033] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] Please refer to Figure 3 , Figure 3 It is a schematic structural diagram of a motor air-cooling heat dissipation evaluation device in one embodiment of the present invention.

[0035] The invention provides a motor air-cooling heat dissipation evaluation device, which is used for performing a simulation test on a motor under test.

[0036] In one embodiment of the present invention, the motor air cooling heat dissipation evaluation device includes the following components:

[0037] 1. Mounting stand with mounting function

[0038] The present invention is composed of a plurality of components with different functions, and the mounting stand 1 is used to realize the installation and fixation between the components. In order to ensure that the mounting stand 1 has a high structural strength, the mounting stand 1 is preferably made of metal materials in the present invention, for example, a frame is made of cast iron or aluminum profiles, and a metal panel is arranged on the frame as a mounting table, and other components are arranged on the mounting table.

[0039] In order to facilitate the structural description, it is defined here that the upper side of the mounting stand 1 (mounting table) is the test surface, and the lower side of the mounting stand 1 (mounting table) is the transmission surface.

[0040] 2. Fixed bracket for installing the rotating shaft

[0041] The function of the fixed bracket 2 is to provide support for the installation of the rotating shaft 3. The fixed bracket 2 is fixed to the installation stand 1, and its connection method is preferably bolt connection, and of course welding connection can also be used.

[0042] In order to improve the structural strength of the fixed bracket 2, the fixed bracket 2 is made of metal material. A rotating shaft 3 is rotatably arranged on the fixed bracket 2, and its specific structure is as follows: a shaft sleeve 15 is arranged at the top of the fixed bracket 2, a plurality of bearings are arranged inside the shaft sleeve 15, and the rotating shaft 3 is inserted into the bearings inside the shaft sleeve 15, so as to realize rotatable installation on the shaft sleeve 15. The shaft sleeve 15 is arranged at the top of the fixed bracket 2 in a fixed manner, and the rotating shaft 3 is rotatably arranged on the fixed bracket 2 through the shaft sleeve 15.

[0043] The rotating shaft 3 is used to realize the rotational motion of the motor under test and the transmission and output of the torque. One end of the rotating shaft 3 is a connecting end for connecting to the motor shaft of the motor under test. A coupling 13 is provided at the connecting end, and the coaxial connection between the rotating shaft 3 and the motor shaft of the motor under test is realized through the coupling 13.

[0044] A first transmission assembly 4 is provided at the other end of the rotating shaft 3, and a transmission shaft 5 is connected to the rotating shaft 3 through the first transmission assembly 4. The transmission shaft 5 is rotatably provided on the transmission surface, and the axis of the transmission shaft 5 is parallel to the axis of the rotating shaft 3. In the present invention, the first transmission assembly 4 is a pulley transmission assembly.

[0045] Specifically, the first transmission assembly 4 includes a first large pulley and a first small pulley, and the first large pulley and the first small pulley are connected to each other by a transmission belt. The first large pulley is installed on the shaft end of the rotating shaft 3 by a key connection, and the first small pulley is installed on one end of the transmission shaft 5 by a key connection (another pulley is provided at the other end of the transmission shaft 5). In this way, the rotating shaft 3 and the transmission shaft 5 are connected by the pulley transmission assembly.

[0046] In another embodiment of the present invention, the first transmission assembly 4 may also be a gear transmission system.

[0047] 3. Motor mounting frame for mounting the motor under test

[0048] The motor mounting frame 6 is arranged on the test surface for mounting the motor under test. In one embodiment of the present invention, the motor mounting frame 6 can be flange mounted or foot mounted according to the mounting method of the motor under test. The mounting method can be selected and determined according to the actual use of the motor.

[0049] The motor mounting frame 6 under test preferably adopts a metal motor mounting frame structure design, and a slide rail is provided at the bottom of the motor mounting frame 6 under test, and the slide rail is fixedly provided on the test surface, so that the motor mounting frame 6 under test can be slidably provided on the mounting stand 1 through the slide rail. Specifically, the motor mounting frame 6 under test can slide along the axis extension direction of the rotating shaft 3.

[0050] 4. Adjustable load device for obtaining test data and providing rotational load

[0051] The adjustable load device 7 is disposed on the mounting stand 1 , and the adjustable load device 7 is dynamically connected to the transmission shaft 5 via the second transmission assembly 8 .

[0052] In the present invention, the adjustable load device 7 includes a test shaft. By driving the test shaft to rotate, parameters such as torque and rotation speed can be obtained.

[0053] Specifically, the second transmission assembly 8 is a pulley transmission assembly. The second transmission assembly 8 includes a second large pulley and a second small pulley, and the second large pulley and the second small pulley are connected to each other by a transmission belt. The second small pulley is installed on the shaft end of the transmission shaft 5 by a key connection, and the second large pulley is installed on the test shaft of the adjustable load device 7 by a key connection.

[0054] In another embodiment of the present invention, the second transmission assembly 8 may also be a gear transmission system for achieving a reduced speed output of the transmission shaft 5 .

[0055] Through the above-mentioned structural design, in the electric motor air-cooling and heat dissipation evaluation device provided by the present invention, it is provided with two sets of transmission components, and the rotational motion and torque of the motor under test are output by using the rotating shaft and the transmission shaft. Through the layout design of the rotating shaft and the transmission shaft, the adjustable load device can be reasonably installed on the mounting stand, thereby avoiding the influence of the cross-sectional area of ​​the adjustable load device on the air-cooling airflow of the motor under test, and the influence of the adjustable load device on the ambient temperature of the motor under test, thereby achieving the purpose of improving the reliability of the test data of the motor under test.

[0056] The present invention can apply corresponding electromagnetic torque to the motor under test at a given speed and can adjust the magnitude of the axial force. At the same time, since the motor axis is facing the windward direction of the wind tunnel, it is close to the air-cooling heat exchange conditions when this type of motor is actually used. Therefore, the present invention can more accurately test the temperature and temperature rise of the motor under air-cooling load conditions.

[0057] In order to simulate the axial tension of the motor in actual work, the present invention also provides an axial force applying component, which includes a fixing device 9, a tension sensor 10, and an axial force applying cable 11. The fixing device 9 is fixedly arranged on the test surface, the tension sensor 10 is connected to the fixing device 9, one end of the axial force applying cable 11 is connected to the motor mounting frame 6 to be tested, and the other end of the axial force applying cable 11 is connected to the tension sensor 10.

[0058] Specifically, a control device capable of performing speed and torque tests on the adjustable load device 7 is signal-connected to the adjustable load device 7 .

[0059] The transmission shaft 5 is installed as follows: a shaft end bracket 14 is provided at each end of the transmission shaft 5 , and the shaft end bracket 14 is fixedly provided on the transmission surface. The transmission shaft 5 is rotatably provided on the transmission surface through the shaft end bracket 14 .

[0060] The present invention is installed in an experimental space, which is a wind tunnel capable of controlling air temperature and air pressure. The experimental space can be a space with a circular or square cross-section. In the present invention, the function of the motor air cooling and heat dissipation evaluation device is described as follows:

[0061] The motor under test is fixed on the motor mounting frame 6 that can slide in a straight line direction. The motor shaft of the motor under test is fixedly mounted on the coupling 13 coaxially arranged therewith, and the rotational motion of the motor shaft is transmitted to the first transmission assembly 4 through the transmission shaft 5. A sleeve 15 for mounting the rotating shaft 3 is provided on the fixed bracket 2, and the sleeve 15 provides support for the installation of the rotating shaft 3 on the fixed bracket 2. The rotating shaft 3 transmits power to the transmission shaft 5 through the first transmission assembly 4, and the transmission shaft 5 transmits power to the adjustable load device 7 through the second transmission assembly 8. The adjustable load device 7 can generate torque through an external control device and has the function of speed and torque testing. The shaft end bracket 14 is provided at the shaft end of the transmission shaft 5, and the shaft end bracket 14 provides rotational support for the transmission shaft 5. An axial force applying assembly is provided on the mounting stand 1, and the fixing device 9 of the axial force applying assembly can adjust the length of the axial force applying cable 11, thereby applying axial tension to the motor under test, and the magnitude of the tension can be obtained through the axial force test sensor of the motor mounting frame 6 under test.

[0062] After the motor controller controls the motor under test to rotate to a certain speed, the adjustable load device 7 is controlled by command to generate the load torque required by the motor under test, and the axial force applying component is adjusted to apply the required axial load force to the motor under test. The speed and torque sensors installed in the load device measure the relevant data of the motor under the corresponding conditions, and the temperature rise curve under the conditions is measured by the temperature sensor installed inside the motor or the casing.

[0063] The electromagnetic torque, speed and axial force applied to the motor under test can be set according to the prior data. At the same time, since the motor axis faces the windward direction of the wind tunnel, it is close to the air cooling and heat exchange conditions of such motors in actual use, so the device can more accurately test the temperature and temperature rise of the motor under load conditions.

[0064] In the above structural design, the present invention can also optimize the structure of the motor air-cooling heat dissipation evaluation device: for example, the fixed bracket 2, the rotating shaft 3, the coupling 13 and the bushing 15 can be omitted, and the motor output shaft can be directly connected to the first transmission assembly 4, and the load device 7 can also directly replace the rotating shaft 5, etc., to shorten the transmission distance.

[0065] The present invention also provides a method for evaluating the air-cooling heat dissipation of a motor, which uses the above-mentioned air-cooling heat dissipation evaluation device for the motor to test the air-cooling heat dissipation of the motor.

[0066] Specifically, the present invention transmits the load of the tested motor to an adjustable load device installed at the rear end through a transmission shaft, so that the tested motor can obtain the required load while its windward area is not blocked, simulating the real load under air cooling conditions.

[0067] In one embodiment of the present invention, the adjustable load device includes a motor torque and speed test instrument, and the motor torque and speed test instrument is connected to the transmission shaft.

[0068] In another embodiment of the present invention, the adjustable load device includes a load motor calibrated with a motor-load relationship, and the load motor is connected to the transmission shaft.

[0069] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement and simplification made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A motor air cooling and heat dissipation evaluation device, used for testing the performance of the motor under test, characterized in that: include: A mounting frame (1), wherein the upper side of the mounting frame is a test surface, and the lower side of the mounting frame is a transmission surface; A fixed bracket (2) is arranged on the test surface and used for mounting a rotating shaft, a rotating shaft (3) is rotatably arranged on the fixed bracket, one end of the rotating shaft is a connecting end for connecting to a motor shaft of a motor to be tested, a first transmission assembly (4) is arranged at the other end of the rotating shaft, a transmission shaft (5) is connected to the rotating shaft through the first transmission assembly, the transmission shaft is rotatably arranged on the transmission surface, and the axis of the transmission shaft is parallel to the axis of the rotating shaft; A motor mounting frame (6) to be tested, which is arranged on the test surface and is used to mount the motor (12) to be tested, and the motor mounting frame to be tested can slide along the axial direction of the rotating shaft; An adjustable load device (7) disposed on the mounting frame, the adjustable load device being dynamically connected to the transmission shaft via a second transmission assembly (8); The load of the tested motor is transmitted to the adjustable load device installed at the rear end through the transmission shaft, so that the tested motor can obtain the required load while its windward area is not blocked, which is used to simulate the real load under air cooling conditions.

2. The electric motor air cooling heat dissipation evaluation device according to claim 1, characterized in that: It also includes an axial force application component, which includes a fixing device (9), a tension sensor (10), and an axial force application cable (11). The fixing device is fixedly arranged on the test surface, the tension sensor is connected to the fixing device, one end of the axial force application cable is connected to the motor mounting frame under test, and the other end of the axial force application cable is connected to the tension sensor.

3. The electric motor air cooling heat dissipation evaluation device according to claim 1, characterized in that: A control device capable of performing speed and torque tests on the adjustable load device is signal-connected to the adjustable load device.

4. The electric motor air cooling heat dissipation evaluation device according to claim 1, characterized in that: An axis end bracket (14) is respectively arranged at both ends of the transmission shaft, the axis end bracket is fixedly arranged on the transmission surface, and the transmission shaft is rotatably arranged on the transmission surface through the axis end bracket.

5. The electric motor air cooling heat dissipation evaluation device according to any one of claims 1 to 4, characterized in that: A shaft sleeve (15) is arranged at the top end of the fixed bracket, the rotating shaft is rotatably arranged in the shaft sleeve, and the rotating shaft is rotatably arranged on the fixed bracket through the shaft sleeve.

6. A method for evaluating the heat dissipation of electric motors by air cooling, characterized in that: Using the motor air cooling and heat dissipation evaluation device as claimed in any one of claims 1 to 5 to test the motor air cooling and heat dissipation; The load of the tested motor is transferred to the adjustable load device installed at the rear end through the transmission shaft, so that the tested motor can obtain the required load while its windward area is not blocked, which is used to simulate the real load under air cooling conditions.

7. The method for evaluating the heat dissipation of an electric motor by air cooling according to claim 6, characterized in that: The adjustable load device includes a motor torque and speed testing instrument, and the motor torque and speed testing instrument is connected to the transmission shaft.

8. The method for evaluating the heat dissipation of an electric motor by air cooling according to claim 6, characterized in that: The adjustable load device includes a load motor calibrated with a motor-load relationship, and the load motor is connected to the transmission shaft.

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