Motor back electromotive force and inductance difference coefficient test platform and system

Abstract

The utility model provides a motor back electromotive force and inductance difference coefficient test platform and system, which comprises a base, a support frame is arranged on the base, a driving assembly used for driving a loading arm to rotate is arranged on the support frame, and the driving assembly is connected with a horizontal part of the loading arm; the two ends of the vertical part of the loading arm are symmetrically provided with a group of clamping assemblies, and the clamping assemblies are used for clamping a hub of a tested motor, so that the loading arm drives the tested motor to rotate around a main shaft of the tested motor. One end of the main shaft is arranged at the horizontal part of the loading arm, and the other end is arranged at the top of the limiting frame of which the bottom is slidably connected with the base. According to the motor back electromotive force and inductance difference coefficient test platform, the tested motor can be rapidly installed through cooperation of the clamping assembly and the limiting frame, back electromotive force and inductance tests can be completed on the test platform through one-time installation, inductance test equipment and back electromotive force test equipment are integrated in the test cabinet, and the test efficiency is greatly improved. An integrated multi-parameter collaborative test platform is formed, and high automation is realized.

Description

Technical Field

[0001] This utility model belongs to the field of wheel hub motor performance testing technology, and in particular relates to a testing platform and system for motor back electromotive force and inductance difference coefficient. Background Technology

[0002] With the rapid development of motor technology, the requirements for the accuracy, efficiency, and automation of motor testing equipment are increasing. The "Safety Technical Specification for Electric Bicycles" GB17761-2024 stipulates that when measuring back electromotive force (EMF), an AC peak voltage measuring device with an accuracy of not less than 0.5% should be used. The peak voltage between any two of the three leads of the tested motor should be measured and recorded, and the average of these three measurements should be taken as the no-load back EMF value. When measuring inductance, an inductance measuring device with an accuracy of not less than ±1% should be used. Connect the device to any two of the three leads of the motor, and slowly but continuously rotate the motor rotor in the same direction. Pause once every 30° electrical angle (corresponding to a mechanical angle of 30° divided by the number of pole pairs), and record the inductance measurement device readings three times at each rotor position. The average value should be recorded as the inductance value at that angle. Repeat this operation 12 times, and then calculate the average, standard deviation, and coefficient of variation of all inductance values.

[0003] Currently, motor testing platforms require multiple manual calibrations to align the motor shaft with the rotation center of the testing station. These platforms often use stepper motors to drive the motor to the required speed. When measuring back electromotive force (EMF), an asynchronous acquisition system is used to collect voltage data, which is then calculated. Measuring inductance requires repeating this process 12 times, calculating the average and standard deviation. Therefore, traditional equipment operation and recording, along with manual calculations, are time-consuming, resulting in significant acquisition errors and low voltage accuracy. Furthermore, traditional equipment cannot perform multi-parameter collaborative testing; the measurement of the back EMF and inductance difference coefficient of the motor must be performed at separate testing stations, leading to a lack of data coupling analysis and a large overall evaluation error. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model aims to propose a test platform and system for motor back electromotive force and inductance difference coefficient. The rotating shaft of the motor under test is easily aligned with the rotation center of the testing station, and the back electromotive force and inductance difference coefficient are tested in a coordinated manner to reduce the overall evaluation error.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A testing platform for back electromotive force and inductance difference coefficient of a motor includes a base, a support frame mounted on the base, and a drive assembly for driving a loading arm to rotate mounted on the support frame. The drive assembly is connected to the horizontal part of the loading arm. A set of clamping assemblies is symmetrically arranged at both ends of the vertical part of the loading arm. The clamping assemblies are used to clamp the hub of the motor under test, so that the loading arm drives the motor under test to rotate around its main shaft. One end of the main shaft is placed on the horizontal part of the loading arm, and the other end is mounted on the top of a limiting frame. The bottom of the limiting frame is slidably connected to the base.

[0007] Furthermore, the drive assembly includes a drive motor, a transmission shaft, and a bearing housing. The drive motor is mounted on a support frame, and the output shaft of the drive motor is connected to one end of the transmission shaft. The other end of the transmission shaft passes through the bearing housing and is connected to the loading arm. The transmission shaft and the bearing housing are connected by a bearing, and the bearing housing is mounted on the support frame.

[0008] Furthermore, the clamping assembly includes a first clamping plate and a second clamping plate arranged in parallel. The first clamping plate and the second clamping plate are used to clamp the wheel hub and are connected by clamping bolts. The upper end of the second clamping plate is inclined and slides with the lower end of the third clamping plate. The third clamping plate is connected to the side of the first clamping plate near the second clamping plate. The other side of the first clamping plate is connected to one end of a connecting rod. The other end of the connecting rod passes through the vertical part of the loading arm. The connecting rod is mounted on a connecting plate, and the connecting plate is connected to the vertical part of the loading arm.

[0009] Furthermore, the upper end of the clamping plate two is provided with a sliding groove, and the lower end of the clamping plate three is provided with a protrusion for sliding cooperation with the sliding groove.

[0010] Furthermore, one end of the connecting plate is provided with a groove for the connecting rod to pass through, and the groove is connected by bolts at the top; the connecting plate is provided with a waist-shaped hole one for connecting with the loading arm, and the two ends of the vertical part of the loading arm are respectively provided with waist-shaped holes two that cooperate with the waist-shaped hole one.

[0011] Furthermore, the limiting frame includes a limiting frame body, a sliding groove is opened at the bottom of the limiting frame body, a sliding rail is provided on the base to cooperate with the sliding groove, and the base is bolted to the limiting frame body; the upper part of the limiting frame body is provided with a plurality of grooves for accommodating the spindle, a cover plate is installed on the top of the groove, and a tightening bolt for tightening the spindle is provided on the cover plate.

[0012] A testing system for testing the back electromotive force (EMF) and inductance difference coefficient of a motor includes a drive module, a back EMF testing module, an inductance testing module, and a host computer. The drive module, back EMF testing module, and inductance testing module are electrically connected to the host computer. The drive module is used to control the rotation of the drive assembly. When measuring the no-load back EMF, the back EMF testing module is connected to the three leads of the motor under test. When measuring the inductance, the inductance testing module is electrically connected to any two of the three leads of the motor under test.

[0013] Furthermore, the back EMF testing module includes a terminal block, voltage sensor one, voltage sensor two, voltage sensor three, a data acquisition unit, and a power supply unit. The first, second, and third pins of the terminal block's input end are respectively connected to the three leads of the motor under test. The first pin of the terminal block's output end is respectively connected to the first pin of voltage sensor one and the first pin of voltage sensor three. The second pin of the terminal block's output end is respectively connected to the second pin of voltage sensor one and the first pin of voltage sensor two. The third pin of the terminal block's output end is respectively connected to the second pin of voltage sensor two and the second pin of voltage sensor three. The output pins of voltage sensor one, voltage sensor two, and voltage sensor three are respectively connected to the first, second, and third pins of the data acquisition unit. The fourteenth, fifteenth, and sixteenth pins of the data acquisition unit are all grounded. Voltage sensor one, voltage sensor two, and voltage sensor three are each powered by the power supply unit.

[0014] Furthermore, the testing system also includes a motor rated continuous output power module, which includes a temperature sensor mounted on the motor under test for measuring the temperature of the motor under test.

[0015] Furthermore, the testing system also includes a testing cabinet, which has at least one horizontal partition inside. The testing platform is mounted on the horizontal partition, and a vertical partition is provided between the drive assembly and the loading arm. The testing cabinet houses a drive module, a back EMF testing module, an inductance testing module, and a motor rated continuous output power module.

[0016] Compared with existing technologies, the testing platform and system for motor back electromotive force and inductance difference coefficient described in this utility model have the following advantages:

[0017] (1) The motor back electromotive force and inductance difference coefficient test platform of the present invention can quickly and accurately install the motor under test through the cooperation of clamping components and limit frame. The back electromotive force and inductance test can be completed on the test platform after the motor under test is installed once. There is no need for manual multiple calibrations to align the rotation center of the motor under test shaft with the test station, which ensures good coaxiality and stability of the motor under test during rotation test. It can greatly reduce the measurement error caused by motor shaking or offset. Moreover, the clamping components can prevent the equipment from losing rotation when measuring data, which further improves the accuracy of test data. At the same time, it reduces the difficulty of motor alignment and improves test efficiency.

[0018] (2) The motor back EMF and inductance difference coefficient testing system described in this utility model integrates the inductance testing and back EMF testing equipment in a test cabinet, forming an integrated multi-parameter collaborative testing platform, achieving a high degree of automation. In the back EMF test, the drive motor automatically runs the motor under test to the set speed and maintains it, while the back EMF testing module automatically measures and records the data. In the inductance test, the host computer can set the electrical angle of the drive motor, and the drive motor slowly but continuously rotates the motor under test, pausing each time the set electrical angle is reached, automatically recording the data and calculating the average value, reducing manual operation errors and labor intensity, and improving the stability and consistency of the testing process. The multi-parameter collaborative testing method not only improves the utilization rate of the equipment, but also facilitates the comprehensive analysis of the test data, avoiding comprehensive evaluation errors caused by the lack of data coupling analysis, and providing a more accurate and objective basis for the comprehensive evaluation of motor performance. Attached Figure Description

[0019] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0020] Figure 1 Side view of the overall structure of the test platform provided in this embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the overall structure of the testing platform provided in an embodiment of the present utility model;

[0022] Figure 3 A side view of the clamping assembly structure provided in an embodiment of this utility model;

[0023] Figure 4 This is a schematic diagram of the clamping assembly structure provided in an embodiment of the present utility model;

[0024] Figure 5 This is a schematic diagram of the control system for the test system provided in an embodiment of the present utility model;

[0025] Figure 6 A schematic diagram of the back electromotive force testing module provided in this embodiment of the utility model;

[0026] Figure 7 A schematic diagram of the test cabinet structure provided in this embodiment of the utility model;

[0027] Figure 8 This is a schematic cross-sectional view of the test cabinet provided in an embodiment of the present utility model;

[0028] Figure 9 The rear view of the test cabinet provided for an embodiment of this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Base; 11. Slide rail; 2. Support frame; 3. Drive assembly; 31. Drive motor; 32. Transmission shaft; 33. Bearing seat; 4. Loading arm; 41. Waist-shaped hole two; 5. Clamping assembly; 51. Clamping plate one; 52. Clamping plate two; 53. Clamping plate three; 54. Clamping bolt; 55. Connecting rod; 56. Connecting plate; 561. Groove; 562. Waist-shaped hole one; 6. Motor under test; 61. Hub; 62. Main shaft; 7. Limiting frame; 71. Limiting frame body; 72. Cover plate; 73. Groove; 74. Tightening bolt;

[0031] 81. Terminal block; 82. Voltage sensor one; 83. Voltage sensor two; 84. Voltage sensor three; 85. Data acquisition unit; 86. Power supply unit; 9. Test cabinet; 91. Horizontal partition; 92. Vertical partition; 93. Cabinet door one; 94. Cabinet door two; 95. Heat dissipation holes. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0033] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] like Figures 1 to 9 As shown, a test platform for back electromotive force and inductance difference coefficient of a motor includes a base 1, a support frame 2 mounted on the base 1, a drive assembly 3 mounted on the support frame 2, the output end of the drive assembly 3 being connected to the horizontal part of a loading arm 4, and the drive assembly 3 being used to drive the loading arm 4 to rotate; a set of clamping assemblies 5 are symmetrically arranged at both ends of the vertical part of the loading arm 4, the clamping assemblies 5 being used to clamp the hub 61 of the motor under test 6, so that the loading arm 4 drives the motor under test 6 to rotate around its main shaft 62; one end of the main shaft 62 is located in the middle of the loading arm 4, and the other end is mounted on the top of a limiting frame 7, the bottom of the limiting frame 7 being slidably connected to the base 1.

[0037] In a preferred embodiment of the present invention, the drive assembly 3 includes a drive motor 31, a transmission shaft 32, and a bearing housing 33. The drive motor 31 is mounted on the support frame 2. The output shaft of the drive motor 31 is connected to one end of the transmission shaft 32. The other end of the transmission shaft 32 passes through the bearing housing 33 and is connected to the loading arm 4. The transmission shaft 32 and the bearing housing 33 are connected by a bearing. The bearing housing 33 is mounted on the support frame 2.

[0038] Specifically, the drive motor 31 is a servo motor, and the transmission shaft 32 is connected to the bearing housing 33 through a bearing, so that the transmission shaft 32 can rotate smoothly under the support of the bearing.

[0039] In a preferred embodiment of this invention, the horizontal portion of the loading arm 4 is perpendicular to the vertical portion. One end of the horizontal portion is connected to the transmission shaft 32, and the other end is hollow to facilitate the placement of the main shaft 62. This ensures that the tested motor 6 maintains good coaxiality and stability during rotation testing, reducing measurement errors caused by motor shaking or offset. By setting the loading arm 4, the device does not lose rotation during data measurement, making the test data more accurate. At the same time, the loading arm 4 reduces the difficulty of centering the motor.

[0040] In a preferred embodiment of this utility model, the clamping assembly 5 includes a first clamping plate 51 and a second clamping plate 52 arranged in parallel. The first clamping plate 51 and the second clamping plate 52 are used to clamp the wheel hub 61, and the first clamping plate 51 and the second clamping plate 52 are connected by clamping bolts 54. The upper end of the second clamping plate 52 is inclined and slides with the lower end of the third clamping plate 53. The third clamping plate 53 is connected to the side of the first clamping plate 51 near the second clamping plate 52. The other side of the first clamping plate 51 is connected to one end of the connecting rod 55, and the other end of the connecting rod 55 passes through the vertical part of the loading arm 4. The connecting rod 55 is mounted on the connecting plate 56, and the connecting plate 56 is bolted to the vertical part of the loading arm 4.

[0041] Specifically, clamping plate 51 and clamping plate 52 are arranged in parallel and connected by clamping bolts 54 to form an adjustable-gap clamping structure for clamping the hub 61 of the motor under test. When the motor under test 6 needs to be installed, first loosen the clamping bolts 54 to increase the distance between clamping plate 51 and clamping plate 52, and place the hub 61 between them. Tighten the clamping bolts 54, and clamping plate 52 moves closer to the hub 61, generating clamping force, thereby firmly clamping the hub 61.

[0042] In a preferred embodiment of the present invention, the upper end of the second clamping plate 52 is provided with a sliding groove, and the lower end of the third clamping plate 53 is provided with a protrusion for sliding cooperation with the sliding groove.

[0043] Specifically, the upper end of clamping plate two 52 is inclined and slides in engagement with the lower end of clamping plate three 53. When the clamping bolt 54 is tightened, clamping plate two 52 is forced to move towards clamping plate one 51, and its upper end slides along the inclined surface of the lower end of clamping plate three 53, causing clamping plate three 53 to displace relative to clamping plate one 51, further enhancing the stability of clamping and ensuring that the motor 6 under test will not loosen or displace during the test. The sliding engagement design of the groove and the protrusion allows the clamping assembly 5 to flexibly adapt to hubs 61 of different diameters and shapes, increasing the versatility of the clamping assembly and improving the flexibility and practicality of the test platform.

[0044] In a preferred embodiment of the present invention, one end of the connecting plate 56 is provided with a groove 561 for the connecting rod 55 to pass through, and the groove 561 is connected to the top by bolts; the connecting plate 56 is provided with a waist-shaped hole 562 for connecting with the loading arm 4, and the two ends of the vertical part of the loading arm 4 are respectively provided with waist-shaped holes 41 that cooperate with the waist-shaped hole 562, and the connecting rod 55 can move in the waist-shaped hole 41.

[0045] Specifically, when the position of the clamping assembly 5 needs to be adjusted, loosen the bolts between the connecting plate 56 and the loading arm 4. The connecting rod 55 can move within the oblong hole 41, and the connecting plate 56 can also be displaced relative to the loading arm 4, thereby adjusting the position of the clamping assembly 5 on the loading arm 4. After adjusting to the appropriate position, tighten the bolts to fix the connecting plate 56 on the loading arm 4, completing the position adjustment of the clamping assembly 5.

[0046] This connection method fixes the clamping assembly 5 to the loading arm 4, ensuring that the clamping assembly 5 has good stability during clamping and rotation, while facilitating the disassembly and adjustment of the position of the clamping assembly 5 to accommodate motor hubs 61 of different sizes.

[0047] In a preferred embodiment of this utility model, the limiting frame 7 includes a limiting frame body 71, a cover plate 72, and a tightening bolt 74. The bottom of the limiting frame body 71 has a sliding groove, and the base 1 is provided with a slide rail 11 that cooperates with the sliding groove. The base 1 is provided with threaded holes on both sides of the slide rail 11. The threaded holes are used for bolt connection with the limiting frame body 71. The limiting frame body 71 is provided with a strip hole for the bolt to pass through. The upper part of the limiting frame body 71 is provided with a plurality of grooves 73 for accommodating the main shaft 62. The top of the grooves 73 is installed with a cover plate 72, and the cover plate 72 is provided with a tightening bolt 74 for tightening the main shaft 62.

[0048] Specifically, the sliding groove at the bottom of the limit frame body 71 mates with the slide rail 11 on the base 1, and the threaded holes on both sides of the slide rail 11 on the base 1 and the strip-shaped holes on the limit frame body 71 allow the position of the limit frame 7 to be flexibly adjusted. This can accommodate the test motor spindle 62 of different lengths or installation positions, improving the versatility and adaptability of the test platform, and enabling the limit frame 7 to be quickly and accurately adjusted to the appropriate position to meet the installation requirements of motors of different specifications.

[0049] Multiple grooves 73 on the upper part of the limit bracket body 71 are used to accommodate the spindle 62. The cover plate 72 on the top of the groove 73 and the tightening bolt 74 can firmly press the spindle 62 into the groove 73, ensuring that the spindle 62 will not wobble or shift during the test. Stable support for the spindle 62 helps to improve the accuracy and stability of the motor installation, thereby ensuring the accuracy and reliability of the test data.

[0050] A testing system for testing the back electromotive force (EMF) and inductance difference coefficient of a motor includes a drive module, a back EMF testing module, an inductance testing module, and a host computer. The drive module, back EMF testing module, and inductance testing module are electrically connected to the host computer. The drive module controls the rotation of the drive assembly 3. When measuring the no-load back EMF, the back EMF testing module is connected to the three leads of the motor 6 under test. When measuring the inductance, the inductance testing module is electrically connected to any two of the three leads of the motor 6 under test.

[0051] In a preferred embodiment of this utility model, the back EMF testing module includes a terminal block 81, a voltage sensor 82, a voltage sensor 83, a voltage sensor 84, a data acquisition unit 85, and a power supply unit 86. Voltage sensors 82, 83, and 84 are high-precision voltage sensors with a voltage sampling accuracy of 0.5%, a sampling rate of 10 ks / s, a voltage acquisition range of 1–100V, and high accuracy. The testing rotation speed is 10–1000 R / min, and the parameters are adjustable. The data acquisition unit 85 uses a WH6300 high-speed signal acquisition unit, and its interface is a 25-pin parallel port.

[0052] The terminal block 81 serves as a connection interface with the model number TB2503-L. Its first, second, and third pins are respectively connected to the three lead-out wires of the motor under test 6 for introducing the voltage signal of the motor under test. The first pin at the output end of the terminal block 81 transmits the signal in two paths. One path is transmitted to the first pin of the voltage sensor 82, and the other path is transmitted to the first pin of the voltage sensor 84. Similarly, the signal of the second pin at the output end of the terminal block 81 is also transmitted in two paths to the second pin of the voltage sensor 82 and the first pin of the voltage sensor 83; the signal of the third pin at the output end of the terminal block 81 is transmitted in two paths to the second pin of the voltage sensor 83 and the second pin of the voltage sensor 84.

[0053] The voltage sensor 82, the voltage sensor 83, and the voltage sensor 84 respectively measure and convert the input voltage signals, converting the high-voltage signals into low-voltage signals in proportion for the acquisition instrument 85 to collect.

[0054] The first, second, and third pins of the acquisition instrument 85 respectively receive the signals output by the three voltage sensors. At the same time, the fourteenth, fifteenth, and sixteenth pins of the acquisition instrument 85 are grounded to ensure the stability and accuracy of signal acquisition. The acquisition instrument 85 performs digital processing on the collected signals and transmits the processed data to the host computer.

[0055] The power supply unit 86 provides a stable power supply for the voltage sensor 82, the voltage sensor 83, and the voltage sensor 84 to ensure the normal operation of the sensors.

[0056] In a preferred embodiment of the present utility model, the inductance test module includes an LCR digital bridge, and the LCR digital bridge is electrically connected to any two of the three lead-out wires of the motor under test 6. The inductance accuracy of the LCR digital bridge is 0.5% FS, and the test signal frequency is adjustable from 20 Hz to 200 kHz (step 10 mHz).

[0057] In a preferred embodiment of the present utility model, the test system further includes a motor rated continuous output power module. The motor rated continuous output power module includes a power supply module, a motor performance analyzer, a current sensor, and a temperature sensor. The power supply module supplies power to the motor under test 6 through a controller matching the motor under test 6. The motor performance analyzer collects the current of the controller through the current sensor to obtain the rated current I of the motor under test 6, and collects the three interfaces of the controller pairwise to obtain three voltage values, and takes the average value to obtain the rated voltage U of the motor. The rated output power P of the motor is calculated, P = U * I. Among them, the motor performance analyzer can select the JH6503 motor performance analyzer.

[0058] In a preferred embodiment of this utility model, the testing system further includes a testing cabinet 9. The testing cabinet 9 is divided into upper and lower parts by an internal horizontal partition 91. A base 1 is installed on the horizontal partition 91, and a support frame 2, a drive assembly 3, a loading arm 4, a clamping assembly 5, a motor under test 6, and a limiting frame 7 of the testing platform are installed on the base 1. A vertical partition 92 is installed between the drive assembly 3 and the loading arm 4 to separate and fix these two key components, reduce their mutual interference during operation, and ensure the stable operation of the testing platform.

[0059] The test cabinet 9 can be equipped with multiple horizontal partitions 91 to house an integrated test platform, inductance testing equipment, back EMF testing equipment, and motor rated continuous output power module, reducing component redundancy and creating an integrated multi-parameter collaborative test platform. The test cabinet 9 adopts a reinforced sheet metal shell, and the internal horizontal partitions 91 and vertical partitions 92 are made of thick iron plates to improve equipment safety and reduce the impact of the environment on experimental data.

[0060] The test cabinet 9 has a second door 94 near the loading arm 4, which facilitates the operation, adjustment, and maintenance of the loading arm 4 and its surrounding components. It also facilitates the testing of the back electromotive force and inductance of the leads of the motor under test 6. The test cabinet 9 has a first door 93 on both the front and rear sides, which facilitates the installation, debugging, and maintenance of other components inside the test cabinet.

[0061] The test cabinet 9 has heat dissipation holes 95 on both sides. During the operation of the test platform, the motor and other components will generate heat. The heat dissipation holes 95 can promote air circulation, dissipate the internal heat, and ensure that the equipment operates within the normal temperature range.

[0062] Test cabinet 9 is equipped with casters at the bottom for easy movement and positioning of the entire test platform. Lifting rings are located at the top for easy hoisting using lifting equipment.

[0063] The working principle of a test system that uses a test platform for testing the back electromotive force and inductance difference coefficient of a motor:

[0064] During the back EMF test, one end of the main shaft 62 of the motor under test 6 is placed on the horizontal part of the loading arm 4, and the other end is placed on the limit frame 7 and tightened by the clamping bolt 74 to prevent the main shaft 62 from rotating. The hub 61 is clamped by the clamping assembly 5. After the motor under test 6 is installed, the drive motor 31 drives the loading arm 4 to rotate through the transmission shaft 32, thereby driving the motor under test 6 to rotate around the main shaft 62, so that the motor under test 6 rotates to the rated speed and maintains this speed. Through the back EMF test module, the voltage peak value between every two of the three leads of the motor under test 6 is measured and recorded simultaneously, and the average value of these three peak values ​​is taken as the value of the no-load back EMF.

[0065] In the inductance test, any two of the three leads of the motor under test 6 are selected and clamped by the LCR digital bridge. The rotation angle of the drive motor 31 is set by the software of the host computer. After the drive motor 31 is started, it can slowly but continuously rotate the motor under test 6 in the same direction. It pauses once every time it rotates to the set angle (the corresponding mechanical angle is the set angle divided by the number of pole pairs). The host computer software automatically records the reading of the LCR digital bridge three times when the motor under test 6 is in that position and takes the average value to obtain the inductance value at that angle. The test platform can automatically run this program 12 times. The host computer software automatically calculates the inductance value obtained from the 12 times and takes the average value to obtain the final result.

[0066] In the measurement of the rated continuous output power of the motor, the power supply module supplies power to the motor 6 under test through the controller matched with the motor under test, gradually increasing the load until the speed of the motor 6 under test reaches the rated speed, and the temperature of the motor 6 under test is monitored in real time by the infrared temperature sensor to make the motor 6 under test reach the thermal stability state.

[0067] The motor performance analyzer collects current from the controller through a current sensor to obtain the rated current I of the motor under test 6; and obtains three voltage values ​​by collecting data from the three interfaces of the controller in pairs, taking the average value to obtain the rated voltage U of the motor, and then calculating the rated output power P of the motor, P=U*I.

[0068] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A test platform for back electromotive force and inductance difference coefficient of an electric motor, characterized in that: The device includes a base, on which a support frame is mounted. A drive assembly for rotating a loading arm is mounted on the support frame, and the drive assembly is connected to the horizontal portion of the loading arm. A set of clamping assemblies is symmetrically arranged at both ends of the vertical portion of the loading arm. The clamping assemblies are used to clamp the hub of the motor under test, so that the loading arm drives the motor under test to rotate around its main shaft. One end of the main shaft is placed on the horizontal portion of the loading arm, and the other end is mounted on the top of a limiting frame. The bottom of the limiting frame is slidably connected to the base.

2. The test platform for motor back electromotive force and inductance difference coefficient according to claim 1, characterized in that: The drive assembly includes a drive motor, a transmission shaft, and a bearing housing. The drive motor is mounted on a support frame. The output shaft of the drive motor is connected to one end of the transmission shaft. The other end of the transmission shaft passes through the bearing housing and is connected to the loading arm. The transmission shaft and the bearing housing are connected by a bearing. The bearing housing is mounted on the support frame.

3. The test platform for motor back electromotive force and inductance difference coefficient according to claim 1, characterized in that: The clamping assembly includes a first clamping plate and a second clamping plate arranged in parallel. The first clamping plate and the second clamping plate are used to clamp the wheel hub and are connected by clamping bolts. The upper end of the second clamping plate is inclined and slides with the lower end of the third clamping plate. The third clamping plate is connected to the side of the first clamping plate near the second clamping plate. The other side of the first clamping plate is connected to one end of a connecting rod. The other end of the connecting rod passes through the vertical part of the loading arm. The connecting rod is mounted on a connecting plate, and the connecting plate is connected to the vertical part of the loading arm.

4. The test platform for motor back electromotive force and inductance difference coefficient according to claim 3, characterized in that: The upper end of the second clamping plate is provided with a sliding groove, and the lower end of the third clamping plate is provided with a protrusion for sliding cooperation with the sliding groove.

5. The test platform for motor back electromotive force and inductance difference coefficient according to claim 3, characterized in that: One end of the connecting plate is provided with a groove for the connecting rod to pass through, and the groove is connected by bolts at the top; the connecting plate is provided with a waist-shaped hole 1 for connecting with the loading arm, and the two ends of the vertical part of the loading arm are respectively provided with waist-shaped holes 2 that cooperate with the waist-shaped hole 1.

6. The test platform for motor back electromotive force and inductance difference coefficient according to claim 1, characterized in that: The limiting frame includes a limiting frame body, a sliding groove is opened at the bottom of the limiting frame body, a sliding rail is provided on the base to cooperate with the sliding groove, and the base is bolted to the limiting frame body; the upper part of the limiting frame body is provided with multiple grooves for accommodating the spindle, a cover plate is installed on the top of the groove, and a tightening bolt for tightening the spindle is provided on the cover plate.

7. A test system for back electromotive force and inductance difference coefficient of a motor, characterized in that: The test platform according to any one of claims 1-6 includes a drive module, a back EMF test module, an inductance test module, and a host computer. The drive module, back EMF test module, and inductance test module are electrically connected to the host computer. The drive module is used to control the rotation of the drive assembly. When measuring the no-load back EMF, the back EMF test module is connected to the three leads of the motor under test. When measuring the inductance, the inductance test module is electrically connected to any two of the three leads of the motor under test.

8. The test system for back electromotive force and inductance difference coefficient of a motor according to claim 7, characterized in that: The back EMF testing module includes a terminal block, voltage sensor one, voltage sensor two, voltage sensor three, a data acquisition unit, and a power supply unit. The first, second, and third pins of the terminal block's input end are connected to the three leads of the motor under test, respectively. The first pin of the terminal block's output end is connected to the first pin of voltage sensor one and the first pin of voltage sensor three, respectively. The second pin of the terminal block's output end is connected to the second pin of voltage sensor one and the first pin of voltage sensor two, respectively. The third pin of the terminal block's output end is connected to the second pin of voltage sensor two and the second pin of voltage sensor three, respectively. The output pins of voltage sensor one, voltage sensor two, and voltage sensor three are connected to the first, second, and third pins of the data acquisition unit, respectively. The fourteenth, fifteenth, and sixteenth pins of the data acquisition unit are all grounded. Voltage sensor one, voltage sensor two, and voltage sensor three are each powered by the power supply unit.

9. The motor back electromotive force and inductance difference coefficient testing system according to claim 7, characterized in that: The testing system also includes a motor rated continuous output power module, which includes a temperature sensor mounted on the motor under test for measuring the temperature of the motor under test.

10. The motor back electromotive force and inductance difference coefficient testing system according to claim 7, characterized in that: The testing system also includes a testing cabinet, which has at least one horizontal partition inside. The testing platform is mounted on the horizontal partition, and a vertical partition is provided between the drive component and the loading arm. The testing cabinet is equipped with a drive module, a back EMF testing module, an inductance testing module, and a motor rated continuous output power module.

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