Back EMF Measurement Device for Synchronous Motors

Abstract

This utility model discloses a back EMF measuring device for a synchronous motor, belonging to the technical field of motor measuring devices. It includes: a positioning module for mounting a drive motor and adapted to adjust the position of the drive motor in the horizontal and vertical directions; a moving module for mounting the motor under test and adapted to adjust the angle and horizontal position of the motor under test; a connecting and fixing structure adapted to connect the drive motor and the motor under test after vertical alignment, so that the drive motor and the motor under test are dynamically connected; and a back EMF measuring structure electrically connected to the motor under test and used to measure the back EMF of the motor under test. The back EMF measuring device for a synchronous motor according to this utility model embodiment can ensure the accuracy of the dynamic connection between the drive motor and the motor under test, thus ensuring the accuracy of the test data. It can also reduce the time spent on moving, turning around, clamping, and disassembling the motor under test, improving testing efficiency, providing better performance, and having a wider range of applications.

Description

Technical Field

[0001] This utility model relates to the field of motor measuring device technology, and in particular to a back electromotive force measuring device for a synchronous motor. Background Technology

[0002] With the development of the national economy and the continuous improvement of people's living standards, vehicles are becoming increasingly important in daily life and travel. Permanent magnet synchronous motors (PMSMs) can serve as the main power source for vehicles, converting electrical energy into mechanical energy to drive the wheels. During deceleration or braking, the PMSM can switch to generator mode, converting kinetic energy into electrical energy and feeding it back to the battery. At this time, the PMSM generates a back electromotive force (EMF). The back EMF is a key indicator for evaluating motor performance, and its accurate measurement can effectively reflect the electromagnetic design and manufacturing process level of the PMSM, helping to determine its operating characteristics under different working conditions. Existing measuring devices are complex in structure, requiring a dedicated testing workbench, which increases the time spent on movement, multiple clamping and disassembly operations, and affects testing efficiency, indicating room for improvement. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a back electromotive force measuring device for a synchronous motor. It has a simple structure, allows for multi-directional adjustment of the relative positions of the drive motor and the motor under test, ensuring the accuracy of test data, and reduces the time spent on movement, clamping, and disassembly, thereby improving testing efficiency.

[0004] A back EMF measuring device for a synchronous motor according to an embodiment of the present invention includes: a positioning module for mounting a drive motor and adapted to adjust the position of the drive motor in the horizontal and vertical directions; a moving module for mounting a motor under test and adapted to adjust the angle and horizontal position of the motor under test; a connecting and fixing structure adapted to connect the drive motor and the motor under test after the drive motor and the motor under test are aligned in the vertical direction, so that the drive motor and the motor under test are dynamically connected; and a back EMF measuring structure electrically connected to the motor under test and used to measure the back EMF of the motor under test.

[0005] According to the embodiment of the present invention, the back electromotive force measuring device for a synchronous motor can adjust the positions of the drive motor and the motor under test in multiple directions through the positioning module and the moving module, thereby ensuring the accuracy of the power connection between the drive motor and the motor under test, and thus ensuring the accuracy of the test data. Furthermore, by setting the moving module and the positioning module independently, the moving module can be used in the production line of the motor under test, thereby reducing the time required for the movement, turnover, clamping, and disassembly of the motor under test, improving testing efficiency, achieving better results, and having a wider range of applications.

[0006] According to some embodiments of the present invention, a back electromotive force measuring device for a synchronous motor includes a positioning module comprising a rotating bracket and a lifting component. The lifting component is mounted on the rotating bracket, and the drive motor is connected below the lifting component. The rotating bracket is adapted to rotate around the horizontal direction to adjust the position of the drive motor in the horizontal direction, and the lifting component is used to adjust the position of the drive motor in the vertical direction.

[0007] According to some embodiments of the present invention, a back electromotive force measuring device for a synchronous motor includes a rotating support column and a rotating column. The supporting column extends vertically, and the rotating column is rotatably mounted on the upper part of the supporting column. The rotating column extends horizontally, and the lifting component is mounted on the end of the rotating column away from the supporting column.

[0008] And / or, the lower end of the lifting component is provided with a mounting frame, the drive motor is installed in the mounting frame, and the connecting and fixing structure is installed at the lower end of the mounting frame.

[0009] According to some embodiments of the present invention, a back electromotive force measuring device for a synchronous motor includes a moving module comprising a moving bracket, a clamping bracket, and a rotary drive structure. The motor under test is mounted on the clamping bracket, the clamping bracket is rotatably mounted on the moving bracket, the rotary drive structure is connected to the clamping bracket and is used to drive the clamping bracket to rotate, and the bottom of the moving bracket is provided with casters.

[0010] According to some embodiments of the present invention, a back electromotive force measuring device for a synchronous motor includes a movable support comprising two mounting columns, which extend vertically and are spaced apart horizontally. A clamping support is located between the two mounting columns and is rotatably connected to the two mounting columns on both sides. The rotary drive structure is mounted on one of the two mounting columns.

[0011] According to some embodiments of the present invention, the back electromotive force measuring device for a synchronous motor includes a clamping bracket comprising two connectors and two clamping members. The two connectors are rotatably connected to the two mounting columns in a one-to-one correspondence. The two clamping members are connected to the side of the two connectors away from the mounting columns in a one-to-one correspondence. A clamping space is defined between the two clamping members, and the motor under test is clamped in the clamping space.

[0012] The position of at least one of the clamping members relative to the corresponding connecting member is adjustable along the distribution direction of the two mounting posts.

[0013] According to some embodiments of the present invention, a back electromotive force measuring device for a synchronous motor includes a connecting and fixing structure comprising a connecting plate and a transmission component. The connecting plate is connected to the positioning module and fixed relative to the drive motor. The transmission component is detachably mounted on the motor shaft of the drive motor. The drive motor is adapted to be poweredly connected to the motor under test through the transmission component. The connecting plate is adapted to be connected to the motor under test when the motor under test and the drive motor are aligned.

[0014] According to some embodiments of the present invention, the back electromotive force measuring device for a synchronous motor is provided, wherein the transmission component is constructed as a spline, the motor shaft of the drive motor is provided with a first insertion hole extending axially, the motor shaft of the motor under test is provided with a second insertion hole extending axially, and the two ends of the spline are respectively inserted into the first insertion hole and the second insertion hole, thereby enabling circumferential transmission cooperation between the motor shaft of the drive motor and the motor shaft of the motor under test.

[0015] The axis of the motor shaft of the drive motor, the axis of the spline, and the axis of the motor shaft of the drive motor are all coaxially arranged.

[0016] According to some embodiments of the present invention, a back electromotive force measuring device for a synchronous motor includes a drive motor comprising a motor body and a reducer. The reducer is used to adjust the speed and torque of the motor body, and the motor shaft of the motor body is adapted to be coaxially and dynamically connected to the motor shaft of the motor under test.

[0017] The back electromotive force measuring device for a synchronous motor according to some embodiments of the present invention further includes: a speed regulator, which is electrically connected to the drive motor and is used to adjust the speed of the drive motor;

[0018] And / or, the drive motor is configured as a servo motor.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic diagram of the back electromotive force measuring device for a synchronous motor according to an embodiment of the present invention. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the back electromotive force measuring device for a synchronous motor according to an embodiment of the present invention. Figure 2 .

[0023] Figure label:

[0024] Back electromotive force measuring device 100,

[0025] Positioning module 1, rotating bracket 11, support column 111, rotating column 112, lifting component 12, mounting frame 13, drive motor 14, motor body 141, reducer 142.

[0026] The components include: a movable module 2, a movable bracket 21, a mounting column 211, casters 212, a movable handle 213, a clamping bracket 22, a connector 221, a clamping component 222, a clamping space 223, a rotary drive structure 23, a rotating wheel 231, and the motor under test 24.

[0027] Connecting fixed structure 3, connecting plate 31, speed controller 4. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, 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, features defined with "first" or "second" 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.

[0030] 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.

[0031] The following is for reference. Figures 1-2 The back electromotive force measuring device 100 for a synchronous motor according to an embodiment of the present invention has a simple structure and can adjust the relative position of the drive motor 14 and the motor under test 24 in multiple directions to ensure the accuracy of the test data. It can also reduce the time spent on movement, clamping and disassembly, and improve the testing efficiency.

[0032] like Figures 1-2 As shown, a back EMF measuring device 100 for a synchronous motor according to an embodiment of the present invention includes: a positioning module 1, a moving module 2, a connecting and fixing structure 3, and a back EMF measuring structure.

[0033] The positioning module 1 is used to install the drive motor 14 and is adapted to adjust the position of the drive motor 14 in the horizontal and vertical directions. The moving module 2 is used to install the motor under test 24 and is adapted to adjust the angle and horizontal position of the motor under test 24. The connecting and fixing structure 3 is adapted to connect between the drive motor 14 and the motor under test 24 after they are aligned in the vertical direction, so that the drive motor 14 and the motor under test 24 are powered together. The back electromotive force measuring structure is electrically connected to the motor under test 24 and is used to measure the back electromotive force of the motor under test 24.

[0034] In this embodiment, the synchronous motor is constructed as a permanent magnet synchronous motor (PMSM), which serves as the vehicle's primary power source, converting electrical energy into mechanical energy to drive the wheels. During deceleration or braking, the PMSM can switch to generator mode, converting kinetic energy into electrical energy and feeding it back to the battery. In this state, the PMSM generates a back electromotive force (EMF). To test the back EMF of the PMSM, it can be driven to rotate by an external power source. The magnetic field of the rotor permanent magnets within the PMSM cuts the stator windings, inducing a back EMF at the winding terminals. Since the PMSM is in an unloaded state, the measured terminal voltage is the back EMF.

[0035] Specifically, the back EMF measuring device 100 is used to test the back EMF of a synchronous motor and is equipped with a positioning module 1. The positioning module 1 is used to install a drive motor 14. The drive motor 14 can provide kinetic energy to the motor under test 24, causing the motor under test 24 to rotate and generate a back EMF. The positioning module 1 can adjust the position of the drive motor 14 in the horizontal direction and also adjust the position of the drive motor 14 in the vertical direction. The drive motor 14 is fixedly installed on the positioning module 1. The position of the drive motor 14 can be adjusted through the positioning module 1 to suit different motors under test 24, thereby improving the versatility of the back EMF measuring device 100.

[0036] The back EMF measuring device 100 is also equipped with a moving module 2. The motor under test 24 can be installed on the moving module 2, and the motor under test 24 is detachable from the moving module 2, thereby allowing for the replacement of different motors under test 24, improving the versatility of the back EMF measuring device 100. When the motor under test 24 is installed on the moving module 2, the moving module 2 can adjust the installation angle of the motor under test 24, and can also adjust the horizontal position of the motor under test 24 to ensure the accuracy of the connection between the motor under test 24 and the drive motor 14, thereby improving the accuracy of the test of the motor under test 24. Furthermore, by installing the motor under test 24 on the independent moving module 2, the moving module 2 can move the motor under test 24 to other workstations without the need for a dedicated test platform. This allows the moving module 2 to be used in the production line of the motor under test 24, thereby reducing the time spent on moving, turning over, clamping, and disassembling the motor under test 24, and improving the testing efficiency.

[0037] Furthermore, the back EMF measuring device 100 is also equipped with a connecting and fixing structure 3 and a back EMF measuring structure. When the positioning module 1 adjusts the position of the drive motor 14 and the moving module 2 adjusts the position of the motor under test 24, so that the drive motor 14 and the motor under test 24 are aligned in the vertical direction, the connecting and fixing structure 3 can be connected between the drive motor 14 and the motor under test 24, thereby enabling the drive motor 14 to be poweredly connected to the motor under test 24. That is, when the drive motor 14 is running, it can drive the motor under test 24 to rotate, so that the motor under test 24 generates a back EMF. At this time, the motor under test 24 is in a non-powered state, which can ensure the accuracy of the measured back EMF. The back EMF measuring structure can be electrically connected to the motor under test 24 to directly obtain the back EMF data of the motor under test 24. The operation is simple, the data can be read directly, and no calculation is required, avoiding calculation errors and ensuring the accuracy of the test results.

[0038] According to the embodiment of the present invention, the back electromotive force measuring device 100 for synchronous motors can adjust the positions of the drive motor 14 and the motor under test in multiple directions through the positioning module 1 and the moving module 2, thereby ensuring the accuracy of the power connection between the drive motor 14 and the motor under test 24 and ensuring the accuracy of the test data. Furthermore, by setting the moving module 2 and the positioning module 1 independently, the moving module 2 can be used in the production line of the motor under test 24, thereby reducing the time required for the movement, turnover, clamping, and disassembly of the motor under test 24, improving testing efficiency, achieving better results, and having a wider range of applications.

[0039] In some embodiments, the positioning module 1 includes a rotating bracket 11 and a lifting member 12. The lifting member 12 is mounted on the rotating bracket 11, and the drive motor 14 is connected below the lifting member 12. The rotating bracket 11 is adapted to rotate around the horizontal direction to adjust the position of the drive motor 14 in the horizontal direction, and the lifting member 12 is used to adjust the position of the drive motor 14 in the vertical direction.

[0040] Specifically, the positioning module 1 can adjust the position of the drive motor 14, and as follows: Figures 1-2 As shown, the positioning module 1 is equipped with a rotating bracket 11 and a lifting component 12. The rotating bracket 11 can rotate horizontally, and the lifting component 12 is installed on the rotating bracket 11, meaning that the lifting component 12 can rotate horizontally with the rotating bracket 11. The drive motor 14 is installed below the lifting component 12. The vertical length of the lifting component 12 is adjustable, thereby adjusting the vertical height of the drive motor 14. In this way, the rotating bracket 11 can drive the lifting component 12 to rotate horizontally, and the lifting component 12 can drive the drive motor 14 to rotate horizontally, thereby adjusting the horizontal position of the drive motor 14. The lifting component 12 can also adjust the vertical position of the drive motor 14, thus allowing for multi-directional adjustment of the position of the drive motor 14 and ensuring the reliability of the alignment between the drive motor 14 and the motor 24 under test.

[0041] Alternatively, the lifting component 12 can be configured as a lifting motor and a lead screw. The lifting motor is mounted on the rotating bracket 11 and can be threadedly connected to a lead screw extending in the vertical direction. The drive motor 14 is connected to the lower end of the lead screw. When the lifting motor is running, the lead screw rotates to adjust the height of the drive motor 14 in the vertical direction. The lifting component 12 can also be configured as a lifting motor and a connecting chain. The drive motor 14 is mounted on the lower end of the connecting chain. When the lifting motor is running, the connecting chain can be wound up or released. The drive motor 14 can also hang down to the bottom of the connecting chain under the action of gravity, thereby adjusting the position of the drive motor 14 in the vertical direction. The configuration is flexible and can meet different configuration requirements, improving versatility.

[0042] In some embodiments, the rotating bracket 11 includes a support column 111 and a rotating column 112. The support column 111 extends vertically, and the rotating column 112 is rotatably mounted on the upper part of the support column 111. The rotating column 112 extends horizontally, and the lifting member 12 is mounted on the end of the rotating column 112 away from the support column 111.

[0043] Specifically, the rotating bracket 11 can adjust the position of the drive motor 14 in the horizontal direction, and as... Figure 2As shown, the rotating bracket 11 is provided with a support column 111 and a rotating column 112. The support column 111 extends vertically, and the rotating column 112 extends horizontally. One end of the rotating column 112 is rotatably connected to the upper part of the support column 111. A lifting component 12 is installed at the end of the rotating column 112 away from the support column 111, and a drive motor 14 is connected below the lifting component 12. Thus, when the rotating column 112 rotates around the support column 111, it can drive the drive motor 14 to rotate horizontally. This creates a distance between the rotating column 112 and the ground, allowing the lifting component 12 to lift the drive motor 14 into the air. The moving module 2 can then move the motor under test 24 below the drive motor 14, facilitating the alignment of the drive motor 14 and the motor under test 24.

[0044] In actual setup, the support column 111 can be rotatable, and the rotating column 112 can be fixedly connected to the support column 111. The rotating column 112 can also be telescopic, thereby adjusting the rotation range of the drive motor 14 to meet different usage requirements.

[0045] In other embodiments, the lower end of the lifting member 12 is provided with a mounting frame 13, the drive motor 14 is installed in the mounting frame 13, and the connecting and fixing structure 3 is installed at the lower end of the mounting frame 13.

[0046] Specifically, such as Figures 1-2 As shown, the lower end of the lifting component 12 is provided with a mounting frame 13, and an installation space is formed inside the mounting frame 13. The drive motor 14 can be installed in the installation space and can be fixedly connected to the mounting frame 13 to ensure the installation reliability of the drive motor 14. The connecting and fixing structure 3 can be connected to the lower end of the mounting frame 13, thereby increasing the installation reliability of the connecting and fixing structure 3.

[0047] In some embodiments, the moving module 2 includes a moving bracket 21, a clamping bracket 22, and a rotary drive structure 23. The motor under test 24 is mounted on the clamping bracket 22, the clamping bracket 22 is rotatably mounted on the moving bracket 21, the rotary drive structure 23 is connected to the clamping bracket 22 and is used to drive the clamping bracket 22 to rotate, and the bottom of the moving bracket 21 is provided with casters 212.

[0048] Specifically, the moving module 2 can adjust the position of the motor 24 under test, and as... Figures 1-2As shown, the moving module 2 is equipped with a moving bracket 21, a clamping bracket 22, and a rotary drive structure 23. Both the clamping bracket 22 and the rotary drive structure 23 are mounted on the moving module 2. The motor under test 24 is mounted on the clamping bracket 22. The bottom of the moving bracket 21 is equipped with casters 212, allowing the moving bracket 21 to move the clamping bracket 22, the rotary drive structure 23, and the motor under test 24 on a horizontal plane. This enables the motor under test 24 to move between multiple workstations, improving versatility and avoiding multiple disassembly and reassembly of the motor under test 24, saving time. In actual setup, a locking structure can be installed on the casters 212 to lock them when the motor under test 24 moves to the desired position, ensuring the stability of the measurement process.

[0049] Furthermore, the clamping bracket 22 is rotatably mounted on the movable bracket 21, and the motor under test 24 is mounted on the clamping bracket 22, thereby making the angle of the motor under test 24 adjustable and ensuring the reliability of alignment. The rotary drive structure 23 is connected to the clamping bracket 22, and the rotary drive structure 23 can drive the clamping bracket 22 to rotate relative to the movable bracket 21, thereby driving the motor under test 24 to rotate, making it convenient to use. In actual setup, the rotary drive structure 23 can be set as a worm gear reducer 142, allowing the motor under test 24 to be suspended at any angle, ensuring reliable operation.

[0050] In addition, such as Figure 1 As shown, the mobile module 2 is equipped with a mobile handle 213, which the user can grip when moving the mobile module 2. The rotary drive structure 23 is equipped with a rotating wheel 231, which the user can drive to adjust the angle of the motor 24 under test by rotating the wheel 231, thereby improving the ease of use.

[0051] In some embodiments, the movable support 21 includes two mounting posts 211, which extend vertically and are spaced apart horizontally. The clamping support 22 is located between the two mounting posts 211 and is rotatably connected to the two mounting posts 211 on both sides. The rotation drive structure 23 is mounted on one of the two mounting posts 211.

[0052] Specifically, the clamping bracket 22 is rotatably mounted on the movable bracket 21, and as... Figure 1As shown, the movable bracket 21 is provided with mounting posts 211. There are two mounting posts 211, which extend vertically and are spaced apart. The two sides of the clamping bracket 22 are rotatably connected to the two mounting posts 211 respectively. The movable handle 213 can be installed on the top of the mounting posts 211 for easy gripping by the user. The rotary drive structure 23 is installed on one of the two mounting posts 211 and is poweredly connected to the clamping bracket 22, so that the clamping bracket 22 can rotate relative to the mounting posts 211 to drive the tested motor 24 to rotate. The clamping bracket 22 is installed on the upper part of the mounting posts 211, so that the tested motor 24 is suspended in the air, thereby ensuring the reliability of the rotation of the tested motor 24.

[0053] In some embodiments, the clamping bracket 22 includes two connectors 221 and two clamping members 222. The two connectors 221 are rotatably connected to the two mounting posts 211 respectively. The two clamping members 222 are respectively connected to the side of the two connectors 221 away from the mounting posts 211. A clamping space 223 is defined between the two clamping members 222. The motor under test 24 is clamped in the clamping space 223. The position of at least one clamping member 222 relative to the corresponding connector 221 is adjustable along the distribution direction of the two mounting posts 211.

[0054] Specifically, the motor under test 24 can be mounted on the clamping bracket 22, and as follows: Figure 1 As shown, the clamping bracket 22 is provided with a connector 221 and a clamping member 222. There are two connectors 221, which are rotatably connected to two mounting posts 211 respectively. There are also two clamping members 222, which are connected to the ends of the two connectors 221 that are away from the mounting posts 211 respectively.

[0055] At least one clamping member 222 is adjustable in position relative to the corresponding connector 221 along the distribution direction of the two mounting posts 211. That is, one of the two clamping members 222 can be set to be adjustable in position relative to the corresponding connector 221 along the distribution direction of the two mounting posts 211, or both clamping members 222 can be set to be adjustable in position relative to the corresponding connector 221 along the distribution direction of the two mounting posts 211.

[0056] Furthermore, a clamping space 223 is defined between the two clamping members 222. The position of the clamping members 222 is adjustable, so the size of the clamping space 223 is adjustable, thereby adapting to different models of the motor under test 24, improving the versatility of the moving module 2. The motor under test 24 can be clamped in the clamping space 223. When the motor under test 24 is clamped in the clamping space 223, the position of the motor under test 24 can also be finely adjusted by adjusting the position of the clamping members 222, thereby improving the connection accuracy.

[0057] In actual setup, elongated oval holes extending along the distribution direction of the two mounting posts 211 can be provided on the connector 221 and the clamping member 222, respectively. This allows the clamping member 222 to have a moving capacity in the distribution direction of the two mounting posts 211, and it can be locked with bolts or other structures after moving to the desired position, ensuring the stability of the measurement process. The structure is simple and easy to use. Alternatively, the clamping member 222 can be a single unit, with its two sides connected to the two connectors 221 respectively. A mounting bracket is formed in the middle of the clamping member 222, on which the motor 24 under test can be mounted. The position of the clamping member 222 relative to the connector 221 is adjustable along the distribution direction of the two mounting posts 211, providing a flexible setup.

[0058] In some embodiments, the connection fixing structure 3 includes a connecting plate 31 and a transmission component. The connecting plate 31 is connected to the positioning module 1 and fixed relative to the drive motor 14. The transmission component is detachably mounted on the motor shaft of the drive motor 14. The drive motor 14 is adapted to be poweredly connected to the motor under test 24 through the transmission component. The connecting plate 31 is adapted to be connected to the motor under test 24 when the motor under test 24 and the drive motor 14 are aligned.

[0059] Specifically, the connecting and fixing structure 3 is installed at the bottom of the mounting frame 13, and the connecting and fixing structure 3 includes a connecting plate 31 and a transmission component. The connecting plate 31 is connected to the mounting frame 13, so that the connecting plate 31 is relatively fixed to the drive motor 14. A clearance space is formed in the middle of the connecting plate 31, which can be used to avoid the motor shafts of the drive motor 14 and the motor under test 24, ensuring the reliability of power transmission. When the drive motor 14 and the motor under test 24 transmit power, the connecting plate 31 can be connected to the motor under test 24 through bolts or quick-release clips, etc., to ensure that the relative positions of the two are fixed during operation, and to avoid the measurement accuracy being affected by vibration and displacement.

[0060] Furthermore, the drive motor 14 can be connected to the motor under test 24 via a transmission component, so that the motor shaft of the drive motor 14 and the motor shaft of the motor under test 24 rotate synchronously, ensuring the reliability of power transmission. The transmission component can be connected to the motor shaft of the drive motor 14 via bolts or other structures, making the transmission component replaceable and thus adaptable to different models of the motor under test 24, improving versatility.

[0061] In some embodiments, the transmission component is constructed as a spline. The motor shaft of the drive motor 14 is provided with a first insertion hole extending axially, and the motor shaft of the motor under test 24 is provided with a second insertion hole extending axially. The two ends of the spline are respectively inserted into the first insertion hole and the second insertion hole, so that the motor shaft of the drive motor 14 and the motor shaft of the motor under test 24 are circumferentially driven.

[0062] Specifically, the drive motor 14 can be poweredly connected to the motor under test 24 through a transmission component, which can be constructed as a spline. The motor shaft of the drive motor 14 is provided with a first insertion hole, which extends axially along the motor shaft of the drive motor 14. The motor shaft of the motor under test 24 is provided with a second insertion hole, which also extends axially along the motor shaft of the motor under test 24. Both ends of the spline can be inserted into the first insertion hole and the second insertion hole respectively, which facilitates the alignment of the motor shafts of the drive motor 14 and the motor shafts of the motor under test 24. The spline has a circumferential protrusion, which enables circumferential transmission between the motor shafts of the drive motor 14 and the motor shafts of the motor under test 24, thereby transmitting the power of the drive motor 14 to the motor under test 24. The structure is simple and can ensure the reliability of power transmission.

[0063] The axis of the motor shaft of the drive motor 14, the axis of the spline, and the axis of the motor shaft of the drive motor 14 are all coaxially arranged, which can ensure the coaxiality of the drive motor 14 and the motor under test 24, thereby ensuring the accuracy of the measurement.

[0064] In some embodiments, the drive motor 14 includes a motor body 141 and a reducer 142. The reducer 142 is used to adjust the speed and torque of the motor body 141. The motor shaft of the motor body 141 is adapted to be coaxially connected to the motor shaft of the motor under test 24.

[0065] Specifically, the drive motor 14 is installed below the lifting component 12, and as follows: Figure 1 As shown, the drive motor 14 is provided with a motor body 141 and a reducer 142. The reducer 142 is located below the motor body 141 and between the motor body 141 and the motor under test 24. It can adjust the speed and torque of the motor body 141. When the output speed of the motor body 141 is too high or the torque is insufficient to directly drive the motor under test 24, the reducer 142 can convert the high speed and low torque output of the motor body 141 into a low speed and high torque input suitable for the motor under test 24.

[0066] Thus, by reasonably selecting the reduction ratio of reducer 142, the motor 24 under test can run at a suitable speed, which facilitates the measurement of back electromotive force. At the same time, the high-precision transmission of reducer 142 can also ensure the stability of speed and the uniformity of transmitted torque, reduce the influence of speed fluctuation or torque unevenness on the measurement results, and thus ensure the accuracy of measurement.

[0067] In some embodiments, the back EMF measuring device 100 for the synchronous motor further includes a speed regulator 4, which is electrically connected to the drive motor 14 and is used to adjust the speed of the drive motor 14.

[0068] Specifically, such as Figure 2As shown, the back EMF measuring device 100 for the synchronous motor is also equipped with a speed controller 4. The speed controller 4 can be installed on the rotating bracket 11 and electrically connected to the drive motor 14. The speed controller 4 can precisely adjust the speed of the drive motor 14, thereby flexibly controlling the rotational speed of the motor 24 under test. The speed controller 4 can be set to various speed regulation modes, such as frequency conversion speed regulation and voltage regulation speed regulation. It can accurately set and adjust the speed of the drive motor 14 according to actual measurement needs, meet different usage requirements, and improve the versatility of the back EMF measuring device 100.

[0069] In other embodiments, the drive motor 14 is configured as a servo motor. When the servo motor is running, it can provide stable rotational power to the motor under test 24. High-precision speed control can ensure that the motor under test 24 rotates at a constant speed, thereby improving the accuracy of back electromotive force measurement. In actual settings, the output torque and speed range of different models of servo motors are different. The settings can be adjusted according to the specifications of the motor under test 24 to improve the flexibility of the settings.

[0070] In practical use, the complete measurement process of the back electromotive force of the tested motor 24 is as follows:

[0071] 1. Adjust relative position: Adjust the position of the drive motor 14 through the positioning module 1 and the position of the motor under test 24 through the moving module 2 so that the relative positions of the drive motor 14 and the motor under test 24 are aligned in the vertical direction.

[0072] 2. Installation and connection of drive motor 14 and motor under test 24: The drive motor 14 and the motor under test 24 are rigidly connected by the connecting plate 31, and the coaxiality of the motor shaft of the drive motor 14 and the motor shaft of the motor under test 24 is ensured by the transmission component. At the same time, the test probe of the high-precision voltmeter is connected between any two phases of the motor under test 24 to prepare for the measurement of open circuit voltage.

[0073] 3. Speed ​​Adjustment and Drive: After presetting the speed according to the measurement requirements, the motor body 141 of the drive motor 14 is started. After speed adjustment and torque amplification through the reducer 142, the power is transmitted to the motor under test 24 to drive the motor under test 24 to rotate at a constant speed. During this process, the motor under test 24 is always kept in an open circuit state, and the windings of the motor under test 24 are not connected to any load circuit to avoid interference from the load current to the measurement process.

[0074] 4. Voltage Measurement: When the motor under test 24 rotates, its internal windings cut magnetic field lines to generate induced electromotive force, i.e. back electromotive force. The open circuit voltage between two phases of the motor under test 24 can be measured in real time by a high-precision voltmeter. This voltage value is the back electromotive force at that speed.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0076] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A back electromotive force measuring device for a synchronous motor, characterized in that, include: Positioning module (1), the positioning module (1) is used to install drive motor (14) and is adapted to adjust the position of drive motor (14) in the horizontal and vertical directions; The moving module (2) is used to install the motor under test (24) and is adapted to adjust the angle and position of the motor under test (24) in the horizontal direction; A connecting and fixing structure (3) is adapted to be connected between the drive motor (14) and the motor under test (24) after the drive motor (14) and the motor under test (24) are aligned in the vertical direction, so that the drive motor (14) and the motor under test (24) are connected in power; A back electromotive force (EMF) measuring structure is electrically connected to the motor under test (24) and is used to measure the back EMF of the motor under test (24).

2. A back electromotive force measuring device for a synchronous machine according to claim 1, characterized in that, The positioning module (1) includes a rotating bracket (11) and a lifting component (12). The lifting component (12) is mounted on the rotating bracket (11). The drive motor (14) is connected below the lifting component (12). The rotating bracket (11) is adapted to rotate around the horizontal direction to adjust the position of the drive motor (14) in the horizontal direction. The lifting component (12) is used to adjust the position of the drive motor (14) in the vertical direction.

3. A back electromotive force measuring device for a synchronous machine according to claim 2, characterized in that, The rotating bracket (11) includes a support column (111) and a rotating column (112). The support column (111) extends vertically, and the rotating column (112) is rotatably mounted on the upper part of the support column (111). The rotating column (112) extends horizontally, and the lifting member (12) is mounted on the end of the rotating column (112) away from the support column (111). And / or, the lower end of the lifting component (12) is provided with a mounting frame (13), the drive motor (14) is installed in the mounting frame (13), and the connecting and fixing structure (3) is installed at the lower end of the mounting frame (13).

4. The back EMF measurement apparatus of the synchronous machine according to claim 1, characterized by, The moving module (2) includes a moving bracket (21), a clamping bracket (22), and a rotary drive structure (23). The motor under test (24) is mounted on the clamping bracket (22). The clamping bracket (22) is rotatably mounted on the moving bracket (21). The rotary drive structure (23) is connected to the clamping bracket (22) and is used to drive the clamping bracket (22) to rotate. The bottom of the moving bracket (21) is provided with casters (212).

5. A back electromotive force measuring device for a synchronous machine according to claim 4, characterized in that, The movable support (21) includes two mounting posts (211), which extend vertically and are spaced apart horizontally. The clamping support (22) is located between the two mounting posts (211) and is rotatably connected to the two mounting posts (211) on both sides. The rotation drive structure (23) is mounted on one of the two mounting posts (211).

6. A back electromotive force measuring device for a synchronous machine according to claim 5, characterized in that, The clamping bracket (22) includes two connectors (221) and two clamping members (222). The two connectors (221) are rotatably connected to the two mounting posts (211) respectively. The two clamping members (222) are connected to the side of the two connectors (221) away from the mounting posts (211) respectively. A clamping space (223) is defined between the two clamping members (222). The motor under test (24) is clamped in the clamping space (223). The position of at least one of the clamping members (222) relative to the corresponding connecting member (221) is adjustable along the distribution direction of the two mounting posts (211).

7. The back EMF measurement apparatus of the synchronous machine according to claim 1, characterized by, The connection and fixing structure (3) includes a connecting plate (31) and a transmission component. The connecting plate (31) is connected to the positioning module (1) and fixed relative to the drive motor (14). The transmission component is detachably installed on the motor shaft of the drive motor (14). The drive motor (14) is adapted to be poweredly connected to the motor under test (24) through the transmission component. The connecting plate (31) is adapted to be connected to the motor under test (24) when the motor under test (24) and the drive motor (14) are aligned.

8. A back electromotive force measuring device for a synchronous machine according to claim 7, characterized in that, The transmission component is constructed as a spline. The motor shaft of the drive motor (14) is provided with a first insertion hole extending along the axial direction, and the motor shaft of the motor under test (24) is provided with a second insertion hole extending along the axial direction. The two ends of the spline are respectively inserted into the first insertion hole and the second insertion hole, and the motor shaft of the drive motor (14) and the motor shaft of the motor under test (24) are circumferentially driven. The axis of the motor shaft of the drive motor (14), the axis of the spline, and the axis of the motor shaft of the drive motor (14) are all coaxially arranged.

9. The back EMF measurement apparatus of a synchronous machine according to claim 1, characterized by, The drive motor (14) includes a motor body (141) and a reducer (142). The reducer (142) is used to adjust the speed and torque of the motor body (141). The motor shaft of the motor body (141) is adapted to be coaxially connected to the motor shaft of the motor under test (24).

10. The back EMF measurement apparatus of the synchronous machine according to claim 1, characterized by, Also includes: Speed ​​regulator (4), the speed regulator (4) is electrically connected to the drive motor (14), the speed regulator (4) is used to adjust the speed of the drive motor (14); And / or, the drive motor (14) is configured as a servo motor.

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