Clamping and positioning device for motor rotor test

Abstract

The invention discloses a clamping and positioning device for a motor rotor test, and belongs to the technical field of motor test equipment. The clamping and positioning device for the motor rotor test comprises an upper clamping head driving assembly, an upper clamping head assembly, a lower clamping head assembly and a lower clamping head driving assembly, the upper chuck driving assembly is connected with the upper chuck assembly and used for driving the upper chuck assembly to move in the vertical direction. The lower chuck driving assembly is connected with the lower chuck assembly and used for driving the lower chuck assembly to move in the vertical direction. The upper clamping head assembly and the lower clamping head assembly are movably matched to clamp, center and control the rotating precision of the motor rotor; the upper chuck assembly driven by the servo motor and the lower chuck assembly driven by the air cylinder are cooperatively matched, a double-ball-bearing supporting structure and a plug-in type centering mechanism are combined, high-precision centering clamping and stable rotation control over a rotor are achieved, and the clamping device has the advantages of being stable in clamping force, high in positioning precision, reliable in rotation control and convenient and fast to debug.

Description

Technical Field

[0001] This invention relates to the field of motor testing equipment technology, and in particular to a motor rotor testing clamping and positioning device. Background Technology

[0002] Brushless DC motors, with their significant advantages of simple structure and high efficiency, are widely used in many fields such as new energy vehicles, aerospace, and home appliances. As the core component of the motor, the rotor's performance directly determines the motor's efficiency, reliability, and service life. During high-speed rotation, the rotor must withstand multiple loads, including electromagnetic force, centrifugal force, and thermal stress. Material defects, processing errors, or assembly deviations during manufacturing can lead to problems such as insulation failure and mechanical deformation. Therefore, quality testing of the motor rotor is a crucial step in motor research and development and production.

[0003] The core components of rotor testing include inductance testing, resistance testing, and back electromotive force testing. These tests all require placing the rotor under test in a standard test stator, energizing the standard stator to simulate rotor rotation, and performing braking and other actions according to the test program. Because the fit between the rotor under test and the standard test stator is extremely small, and a strong magnetic field exists between them, extremely high requirements are placed on the rotor's positioning and rotation accuracy. On the one hand, the rotor must have extremely high circular runout accuracy during the test rotation; if the circular runout is too large, it can easily cause the rotor and stator to scrape against each other, resulting in irreversible damage and even causing test system failure. On the other hand, the rotor's placement in the test stator must be precise; positional deviations will directly lead to distorted test results. Therefore, developing a reliable, stable, and high-precision clamping and positioning device is crucial to ensuring the stable operation of the test system.

[0004] Existing rotor clamping mechanisms primarily employ cylinder-driven upper and lower pressure heads for clamping: the upper clamping cylinder is fixed to the frame via a connecting plate, the upper pressure head is connected to the upper pressure plate, and the upper pressure plate is connected to the slider and the output rod of the upper clamping cylinder; similarly, the lower lifting cylinder is fixed to the frame via a connecting plate, the lower pressure head is connected to the lower connecting plate, and the lower connecting plate is connected to the slider and the lower lifting cylinder. However, this structure has significant drawbacks: First, the clamping force relies entirely on the cylinder, making it susceptible to air pressure fluctuations, resulting in unstable clamping force. This can easily cause rotor axial movement during rotor rotation testing, not only distorting test results but also potentially leading to rotor collisions with surrounding mechanisms and damaging the testing system. Second, the clamping cylinder has a large diameter and slow response speed, extending testing time and potentially affecting production efficiency. Third, since both upper and lower pressure heads are driven by cylinders, the position adjustment flexibility during debugging is poor, requiring extremely high precision in installation and debugging, which may not meet the needs of high-precision testing. Summary of the Invention

[0005] The purpose of this invention is to solve the problems mentioned in the background art and to provide a motor rotor testing clamping and positioning device.

[0006] To achieve the above objectives, the present invention employs the following technical application:

[0007] A motor rotor testing clamping and positioning device includes an upper chuck drive assembly, an upper chuck assembly, a lower chuck assembly, and a lower chuck drive assembly.

[0008] The upper chuck drive assembly is connected to the upper chuck assembly and is used to drive the upper chuck assembly to move vertically; the lower chuck drive assembly is connected to the lower chuck assembly and is used to drive the lower chuck assembly to move vertically; the upper chuck assembly and the lower chuck assembly move in coordination to clamp, center, and control the rotational accuracy of the motor rotor.

[0009] Preferably, the upper chuck drive assembly includes a servo motor, a motor connecting plate, a frame, a ball screw, a coupling, an upper chuck mounting plate, a first guide rail slider, a screw bearing seat, and a guide rail; the servo motor is fixedly connected to the frame via the motor connecting plate; the screw bearing seat is fixedly connected to the frame, and the ball screw is rotatably connected to the screw bearing seat; the output shaft of the servo motor is connected to the ball screw via the coupling; the upper chuck mounting plate is connected to both the ball screw and the first guide rail slider; the first guide rail slider is slidably connected to the guide rail, and the guide rail is fixedly connected to the frame.

[0010] Furthermore, the lower chuck drive assembly includes a cylinder with a clamping device, a cylinder mounting plate, a lower chuck mounting plate, and a second guide rail slider; the cylinder with the clamping device is fixedly connected to the frame through the cylinder mounting plate; the lower chuck mounting plate is connected to the drive end of the cylinder and the second guide rail slider respectively; the second guide rail slider is slidably connected to the guide rail.

[0011] Preferably, the upper chuck assembly includes an upper clamping shaft, a first ball bearing, an upper chuck sleeve, a pneumatic chuck, and an upper chuck mounting plate; the first ball bearing is fixedly connected in the upper chuck sleeve, and the upper clamping shaft is rotatably connected to the first ball bearing; the pneumatic chuck is fixedly connected to the upper chuck sleeve through the upper chuck mounting plate, and the pneumatic chuck is used to clamp the upper clamping shaft to achieve braking of the motor rotor.

[0012] Preferably, the lower chuck assembly includes a lower clamping shaft, a second ball bearing, a lower chuck sleeve, a lower chuck adjusting plate, a lower chuck fixing plate, and a lower chuck mounting rib; the second ball bearing is fixedly connected in the lower chuck sleeve, and the lower clamping shaft is rotatably connected to the second ball bearing; the lower chuck sleeve is fixedly connected to the lower chuck adjusting plate; the lower chuck adjusting plate is fixedly connected to the lower chuck mounting rib through the lower chuck fixing plate.

[0013] Furthermore, both the upper clamping shaft and the lower clamping shaft are provided with clamping conical surfaces.

[0014] Furthermore, the bottom of the upper clamping shaft is connected to a plug, and the top of the lower clamping shaft has a socket that matches the plug, and the socket is located directly below the plug.

[0015] Compared with the prior art, the present invention provides a motor rotor testing clamping and positioning device, which has the following beneficial effects:

[0016] The parts not mentioned in this device are the same as or can be implemented using existing technologies. This invention achieves high-precision centering and stable rotation control of the rotor by coordinating the upper chuck assembly driven by a servo motor and the lower chuck assembly driven by a cylinder, combined with a double ball bearing support structure and a plug-in centering mechanism. It has the advantages of stable clamping force, high positioning accuracy, reliable rotation control and convenient debugging. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a motor rotor testing clamping and positioning device proposed in this invention. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the structure of a motor rotor testing clamping and positioning device proposed in this invention. Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the upper clamp assembly in a motor rotor testing clamping and positioning device proposed in this invention;

[0020] Figure 4 This is a schematic diagram of the lower clamp assembly in a motor rotor testing clamping and positioning device proposed in this invention.

[0021] In the diagram: 1. Upper chuck drive assembly; 101. Servo motor; 102. Motor connecting plate; 103. Coupling; 104. Upper chuck mounting plate; 105. Frame; 106. First guide rail slider; 107. Ball screw; 108. Screw bearing housing; 109. Guide rail; 2. Upper chuck assembly; 201. Pneumatic chuck; 202. Upper chuck mounting plate; 203. Upper chuck sleeve; 204. 1. First ball bearing; 205. Upper clamping shaft; 3. Lower chuck assembly; 301. Lower clamping shaft; 302. Second ball bearing; 303. Lower chuck sleeve; 304. Lower chuck adjusting plate; 305. Lower chuck fixing plate; 306. Lower chuck mounting rib; 4. Lower chuck drive assembly; 401. Second guide rail slider; 402. Lower chuck mounting plate; 403. Cylinder mounting plate; 404. Cylinder. Detailed Implementation

[0022] The technical applications of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] Example:

[0024] Reference Figures 1-4 A motor rotor testing clamping and positioning device includes an upper chuck drive assembly 1, an upper chuck assembly 2, a lower chuck assembly 3, and a lower chuck drive assembly 4. The upper chuck drive assembly 1 is connected to the upper chuck assembly 2 and drives it to move vertically. The lower chuck drive assembly 4 is connected to the lower chuck assembly 3 and drives it to move vertically. The upper and lower chuck assemblies work together to clamp, center, and control the rotational accuracy of the rotor.

[0025] The upper chuck drive assembly 1 includes a servo motor 101, a motor connecting plate 102, a frame 105, a ball screw 107, a coupling 103, an upper chuck mounting plate 104, a first guide rail slider 106, a screw bearing seat 108, and a guide rail 109. The servo motor 101 is fixedly connected to the frame 105 via the motor connecting plate 102. The screw bearing seat 108 is fixedly connected to the frame 105, and the ball screw 107 is rotatably connected to the screw bearing seat 108. The output shaft of the servo motor 101 is connected to the ball screw 107 via the coupling 103. The upper chuck mounting plate 104 is connected to both the ball screw 107 and the first guide rail slider 106. The first guide rail slider 106 is slidably connected to the guide rail 109, and the guide rail 109 is fixedly connected to the frame 105.

[0026] Specifically, the servo motor 101 can be implemented using a permanent magnet synchronous motor with an encoder, used to output programmable rotary motion.

[0027] Specifically, the servo motor 101 is fixed to the frame 105 via a rigidly connected motor connecting plate 102, forming a stable power output reference. The coupling 103 transmits the rotational output of the servo motor 101 to the ball screw 107, which rotates under the support of the screw bearing seat 108. The nut of the ball screw 107 drives the upper chuck mounting plate 104 to move axially, while the first guide rail slider 106 slides on the guide rail 109 fixed to the frame 105, forming a double guiding constraint. The closed-loop control system of the servo motor 101 adjusts the output torque and speed in real time based on encoder feedback, enabling the linear displacement accuracy of the ball screw 107 to reach the micrometer level. The rigid connection between the guide rail 109 and the frame 105 suppresses vibration and off-center loading during movement, ensuring that the upper chuck assembly 2 moves along a preset trajectory.

[0028] Compared to existing technologies, traditional cylinder drives rely on air pressure fluctuations for power, resulting in inherent instability in clamping force. The servo motor 101, however, directly controls the output force via electrical signals, eliminating the impact of air pressure fluctuations. In existing technologies, the response speed of cylinders is limited by gas compressibility, leading to lag in dynamic adjustment. The ball screw 107 transmission system, on the other hand, achieves millisecond-level response through rapid adjustment of motor speed. Traditional cylinder position adjustment relies on mechanical limit devices, lacking flexibility. The programmable nature of the servo motor 101 allows for flexible adjustment of the clamping position via software parameters.

[0029] Reference Figure 2 The lower chuck drive assembly 4 includes a cylinder 404 with a clamping device, a cylinder mounting plate 403, a lower chuck mounting plate 402, and a second guide rail slider 401. The cylinder 404 with the clamping device is fixedly connected to the frame 105 through the cylinder mounting plate 403. The lower chuck mounting plate 402 is connected to the drive end of the cylinder 404 and the second guide rail slider 401 respectively. The second guide rail slider 401 is slidably connected to the guide rail 109.

[0030] After completing the lifting and lowering drive of the lower chuck assembly 3, the cylinder 404 with clamping device rigidly fixes the piston rod through a built-in mechanical locking mechanism, eliminating the interference of air pressure fluctuations on the clamping state. The rigid connection between the cylinder mounting plate 403 and the frame 105 ensures the stability of the driving force transmission path and avoids deviation of the movement trajectory of the lower chuck assembly 3 due to installation errors. The lower chuck mounting plate 402 is simultaneously connected to the drive end of the cylinder 404 and the second guide rail slider 401, converting the linear driving force of the cylinder 404 into precise guiding motion along the guide rail 109. The fit clearance between the second guide rail slider 401 and the guide rail 109 can be controlled at the micrometer level through the preload adjustment mechanism, effectively eliminating the influence of lateral clearance on positioning accuracy. During the debugging process, the linear guiding characteristics of the guide rail 109 allow the position of the lower chuck assembly 3 to be quickly changed by adjusting the stroke of the cylinder 404, achieving stepless adjustment and rapid positioning in conjunction with the mechanical locking device.

[0031] Compared to existing technologies, traditional applications only use ordinary cylinders to drive the lower chuck, and its clamping force relies entirely on air pressure. During testing, clamping failure is easily caused by air pressure fluctuations. This application combines the mechanical locking device of cylinder 404 with the guiding structure of guide rail 109, retaining the rapid response advantage of cylinder 404 while eliminating the impact of air pressure fluctuations on clamping stability. Existing technologies lack a precision guiding mechanism for the lower chuck, requiring repeated position calibration during debugging. This application achieves unidirectional precision adjustment of the lower chuck assembly 3 position through the coordinated control of the stroke of the second guide rail slider 401 and cylinder 404.

[0032] Through the aforementioned technical application, this application achieves force stability and position repeatability of the lower chuck assembly 3 during the clamping process. The mechanical locking device of the cylinder 404 ensures that the clamping force is unaffected by changes in external air pressure, and the guiding structure of the guide rail 109 ensures that the lower chuck assembly 3 moves precisely along a preset trajectory. During the debugging process, the stroke of the cylinder 404 can be adjusted to quickly adapt to rotors of different specifications. The low friction characteristics of the guide rail 109 make the position fine-tuning operation more convenient, solving the problems of low debugging efficiency and unstable clamping state of traditional cylinder-driven applications.

[0033] Reference Figure 3 The upper chuck assembly 2 includes an upper clamping shaft 205, a first ball bearing 204, an upper chuck sleeve 203, a pneumatic chuck 201, and an upper chuck mounting plate 202. The first ball bearing 204 is fixedly connected in the upper chuck sleeve 203, and the upper clamping shaft 205 is rotatably connected to the first ball bearing 204. The pneumatic chuck 201 is fixedly connected to the upper chuck sleeve 203 through the upper chuck mounting plate 202, and the pneumatic chuck 201 is used to clamp the upper clamping shaft 205 to achieve braking of the motor rotor.

[0034] Specifically, the upper clamping shaft 205 is rotatably connected to the upper chuck sleeve 203 via the first ball bearing 204. When the motor rotor rotates during testing, the upper clamping shaft 205 can rotate freely and synchronously with the rotor, avoiding interference with rotational accuracy caused by frictional resistance generated by traditional cylinder drive. The pneumatic chuck 201 is rigidly connected to the upper chuck sleeve 203 via the upper chuck mounting plate 202. When braking is required, the pneumatic chuck 201 directly grips the outer surface of the upper clamping shaft 205 through the radial contraction of its internal wedge block structure, forming a mechanical lock. The upper chuck sleeve 203, as the basic component supporting the first ball bearing 204, forms a stable support structure with its fixed connection to the upper chuck mounting plate 202, ensuring that the radial clamping force applied by the pneumatic chuck 201 is evenly distributed, thereby maintaining the rotor axis position without deviation during braking.

[0035] Compared to existing technologies, conventional clamping mechanisms rely on continuous pressure from cylinders for clamping, and their clamping force is easily affected by air pressure fluctuations, causing axial movement of the rotor during high-speed rotation. This application replaces continuous air pressure with a mechanical clamping method using a pneumatic chuck 201, eliminating the interference of air pressure fluctuations on the clamping force. Simultaneously, it utilizes a first ball bearing 204 to enable free rotation of the upper clamping shaft 205, avoiding the impact of frictional resistance between the slider and guide rail on the rotor's rotational accuracy in traditional cylinder-driven systems.

[0036] Reference Figure 4 The lower chuck assembly 3 includes a lower clamping shaft 301, a second ball bearing 302, a lower chuck sleeve 303, a lower chuck adjusting plate 304, a lower chuck fixing plate 305, and a lower chuck mounting rib 306. The second ball bearing 302 is fixedly connected in the lower chuck sleeve 303, and the lower clamping shaft 301 is rotatably connected to the second ball bearing 302. The lower chuck sleeve 303 is fixedly connected to the lower chuck adjusting plate 304. The lower chuck adjusting plate 304 is fixedly connected to the lower chuck mounting rib 306 through the lower chuck fixing plate 305.

[0037] Specifically, the second ball bearing 302 is press-fitted into the inner hole of the lower chuck sleeve 303 to form an interference fit, ensuring no relative displacement between the outer ring of the bearing and the inner wall of the sleeve. The lower clamping shaft 301 is fixed to the inner ring of the bearing by an interference fit or a lock nut, forming a support structure that can rotate freely but has no radial clearance. The bottom end face of the lower chuck sleeve 303 is rigidly connected to the lower chuck adjusting plate 304 by a locating pin and bolts, and the reference plane formed by grinding the surface of the adjusting plate ensures the perpendicularity of the sleeve axis. The lower chuck fixing plate 305 is connected to the bottom of the adjusting plate and the side of the mounting rib by double rows of bolts, forming a triangular support structure to resist bending moment. The lower chuck mounting rib 306 is connected to the second guide rail slider 401 of the lower chuck drive assembly 4 by high-strength bolts, so that the clamping force is directly transmitted to the frame 105 through the rib reinforcing ribs, avoiding elastic deformation of the connection interface.

[0038] Compared with existing technologies, traditional chuck assemblies directly achieve clamping by driving the pressure plate with a cylinder, lacking a rigid support structure. Under clamping force, they are prone to elastic deformation, leading to positioning deviations. This application establishes a stable reference surface through the rigid connection between the lower chuck sleeve 303 and the lower chuck adjusting plate 304, uses the reinforcing structure of the lower chuck mounting rib 306 to suppress deformation, and achieves micron-level flatness compensation through two-stage adjusting plates, effectively solving the clamping eccentricity problem.

[0039] It should be noted that the driving force of the upper chuck drive assembly 1 is greater than that of the lower chuck drive assembly 4, so as to drive the motor rotor to adjust to the preset test position.

[0040] Compared with existing technologies, traditional applications using dual-cylinder synchronous drive suffer from clamping force drift due to air pressure fluctuations. This application, through a differentiated drive combination of servo motor 101 and cylinder 404, ensures both the high-precision positioning capability of the upper chuck assembly 2 and retains the rapid response characteristics of the lower chuck assembly 3. Existing technologies cannot achieve dynamic stability of the rotating shaft system with a single pneumatic clamping method. This application, through the synergistic effect of the pneumatic chuck 201 braking and the mechanical self-locking of cylinder 404, can maintain a constant clamping force even when the rotor is rotating at high speed. Traditional structures rely on manual adjustment to achieve centering and alignment. This application utilizes the mechanical self-aligning characteristics of the clamping cone surfaces of the upper clamping shaft 205 and the lower clamping shaft 301 and the plug-in structure to effectively reduce the debugging complexity.

[0041] Reference Figure 3 , Figure 4 Both the upper clamping shaft 205 and the lower clamping shaft 301 are provided with clamping conical surfaces.

[0042] The clamping conical surface forms line or surface contact with the rotor end. Under the action of axial clamping force, the conical surface generates a radial component force, which forces the rotor axis to automatically align with the axes of the upper clamping shaft 205 and the lower clamping shaft 301.

[0043] Specifically, when the upper clamping shaft 205 and the lower clamping shaft 301 move towards each other in the vertical direction, the clamping conical surface contacts the rotor end. The conical structure ensures that the contact points are evenly distributed along the circumference. During the application of axial clamping force, the radial component of the force generated by the conical surface pushes the rotor to make fine adjustments to its position until the rotor axis coincides with the axes of the upper clamping shaft 205 and the lower clamping shaft 301. The frictional force generated by the conical surface contact is evenly distributed along the circumference, which prevents circumferential slippage during rotor rotation and avoids damage to the rotor surface due to excessive local stress. The self-centering characteristic of the conical surface allows the rotor to automatically eliminate initial position deviations during clamping, achieving precise centering without the need for additional adjustment mechanisms.

[0044] The bottom of the upper clamping shaft 205 is connected to a plug, and the top of the lower clamping shaft 301 has a socket that matches the plug, and the socket is located directly below the plug.

[0045] Through the above-mentioned technical application, this application effectively eliminates the influence of pneumatic clamping force fluctuation on test accuracy, realizes controllable adjustment of rotor axial position, shortens clamping and positioning time with the high response speed of servo drive system, enhances position adjustment flexibility with independent control mode of upper and lower chucks, and ensures the coincidence of rotor rotation center with test reference axis through the synergistic effect of clamping cone surface and plug-in structure, providing a reliable clamping basis for high-precision dynamic testing.

[0046] This application further proposes that the lower chuck assembly 3 includes a lower clamping shaft 301, a second ball bearing 302, a lower chuck sleeve 303, a lower chuck adjusting plate 304, a lower chuck fixing plate 305, and a lower chuck mounting rib 306; the second ball bearing 302 is fixedly connected in the lower chuck sleeve 303, and the lower clamping shaft 301 is rotatably connected to the second ball bearing 302; the lower chuck sleeve 303 is fixedly connected to the lower chuck adjusting plate 304; the lower chuck adjusting plate 304 is fixedly connected to the lower chuck mounting rib 306 through the lower chuck fixing plate 305.

[0047] This application further proposes that the bottom of the upper clamping shaft 205 is connected to a plug, and the top of the lower clamping shaft 301 is provided with a socket that matches the plug, and the socket is located directly below the plug.

[0048] The plug refers to a protruding structure located at the end of the upper clamping shaft 205, which can be implemented using a cylindrical or conical geometry, and is used to form a mating relationship with the insertion hole of the lower clamping shaft 301. The insertion hole refers to a groove structure formed on the top of the lower clamping shaft 301, which can be implemented using a hole with a shape complementary to the plug, and is used to guide the plug into place during clamping. The matching relationship between the plug and the insertion hole is configured to prioritize contact during vertical movement, and axial deviation is corrected through the constraint effect of the geometric shape.

[0049] Specifically, when the upper clamping shaft 205 and the lower clamping shaft 301 move towards each other in the vertical direction, the plug first contacts the edge of the socket. Since the socket is located directly below the plug, the plug is guided into the socket by the conical or inclined surface at the moment of contact. The geometric fit between the plug and the socket generates a radial constraint force, forcing the upper clamping shaft 205 and the lower clamping shaft 301 to automatically adjust to a coaxial state. During this process, the conical surface of the plug and the conical inner wall of the socket generate sliding friction, gradually eliminating the radial offset during rotor clamping. After the plug is fully inserted into the socket, the two form a rigid connection, restricting the radial displacement of the rotor during rotation testing.

[0050] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical application and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A motor rotor testing clamping and positioning device, characterized in that, It includes an upper chuck drive assembly (1), an upper chuck assembly (2), a lower chuck assembly (3), and a lower chuck drive assembly (4); The upper chuck drive assembly (1) is connected to the upper chuck assembly (2) and is used to drive the upper chuck assembly (2) to move in the vertical direction; the lower chuck drive assembly (4) is connected to the lower chuck assembly (3) and is used to drive the lower chuck assembly (3) to move in the vertical direction; the upper chuck assembly (2) and the lower chuck assembly (3) move in coordination to clamp, center and control the rotation accuracy of the motor rotor.

2. The motor rotor testing clamping and positioning device according to claim 1, characterized in that, The upper chuck drive assembly (1) includes a servo motor (101), a motor connecting plate (102), a frame (105), a ball screw (107), a coupling (103), an upper chuck mounting plate (104), a first guide rail slider (106), a screw bearing seat (108), and a guide rail (109); the servo motor (101) is fixedly connected to the frame (105) through the motor connecting plate (102); the screw bearing seat (108) is fixedly connected to the frame (105). The ball screw (107) is rotatably connected to the screw bearing seat (108); the output shaft of the servo motor (101) is connected to the ball screw (107) through the coupling (103); the upper chuck mounting plate (104) is connected to the ball screw (107) and the first guide rail slider (106) respectively; the first guide rail slider (106) is slidably connected to the guide rail (109), and the guide rail (109) is fixedly connected to the frame (105).

3. The motor rotor testing clamping and positioning device according to claim 2, characterized in that, The lower chuck drive assembly (4) includes a cylinder (404) with a clamping device, a cylinder mounting plate (403), a lower chuck mounting plate (402), and a second guide rail slider (401); the cylinder (404) with the clamping device is fixedly connected to the frame (105) through the cylinder mounting plate (403); the lower chuck mounting plate (402) is connected to the drive end of the cylinder (404) and the second guide rail slider (401) respectively; the second guide rail slider (401) is slidably connected to the guide rail (109).

4. The motor rotor testing clamping and positioning device according to claim 1, characterized in that, The upper chuck assembly (2) includes an upper clamping shaft (205), a first ball bearing (204), an upper chuck sleeve (203), a pneumatic chuck (201), and an upper chuck mounting plate (202). The first ball bearing (204) is fixedly connected in the upper chuck sleeve (203), and the upper clamping shaft (205) is rotatably connected to the first ball bearing (204). The pneumatic chuck (201) is fixedly connected to the upper chuck sleeve (203) through the upper chuck mounting plate (202), and the pneumatic chuck (201) is used to clamp the upper clamping shaft (205) to achieve braking of the motor rotor.

5. The motor rotor testing clamping and positioning device according to claim 1, characterized in that, The lower chuck assembly (3) includes a lower clamping shaft (301), a second ball bearing (302), a lower chuck sleeve (303), a lower chuck adjusting plate (304), a lower chuck fixing plate (305), and a lower chuck mounting rib (306); the second ball bearing (302) is fixedly connected in the lower chuck sleeve (303), and the lower clamping shaft (301) is rotatably connected to the second ball bearing (302); the lower chuck sleeve (303) is fixedly connected to the lower chuck adjusting plate (304); the lower chuck adjusting plate (304) is fixedly connected to the lower chuck mounting rib (306) through the lower chuck fixing plate (305).

6. The motor rotor testing clamping and positioning device according to claim 4, characterized in that, Both the upper clamping shaft (205) and the lower clamping shaft (301) are provided with clamping conical surfaces.

7. The motor rotor testing clamping and positioning device according to claim 6, characterized in that, The upper clamping shaft (205) is connected to a plug at its bottom, and the lower clamping shaft (301) has a socket at its top that matches the plug, and the socket is located directly below the plug.

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