A device for automatic positioning test of frameless motor

Abstract

The application relates to the technical field of testing devices, and discloses a device for automatic positioning test of frameless motors, which comprises an automatic clamping mechanism, a rotor expansion main shaft, a rotor expansion sleeve axially movably sleeved on the rotor expansion main shaft, a fixed base axially fixed with the rotor expansion main shaft, a plurality of elastic petals circumferentially distributed on the rotor expansion sleeve, a rotor to be tested sleeved on the rotor expansion sleeve, a slope matching structure arranged between the rotor expansion main shaft and the rotor expansion sleeve, and an assembly driving mechanism for driving the rotor expansion sleeve to move axially along the rotor expansion main shaft, so that the elastic petals are driven to expand radially by the slope matching structure to lock the rotor to be tested, and the rotor to be tested is driven to enter the central inner cavity of a stator to be tested to complete assembly. The device utilizes the axial movement of the rotor expansion sleeve to trigger the radial expansion of the elastic petals, simultaneously completes rotor centering, radial clamping and axial assembly of the rotor to be tested, and ensures that the rotor has high coaxiality.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, and in particular to an apparatus for automatic positioning testing of frameless motors. Background Technology

[0002] As a type of high-performance torque motor, frameless motors lack the housing and bearing support structure of traditional motors, meaning the stator and rotor are typically separate. During factory performance testing or R&D experiments, the rotor and stator must be fixed and precisely assembled to ensure a uniform air gap between them that meets design requirements.

[0003] Most existing frameless motor testing fixtures employ manual clamping. Because frameless motor rotors typically contain strongly magnetic magnets, and the air gap between the rotor and stator is extremely small, manual operation not only makes it difficult to ensure the coaxiality of the rotor and stator, but also, under the influence of strong magnetic attraction, the rotor is highly susceptible to collision or friction with the inner wall of the stator, leading to magnet breakage or damage to the stator coils. Furthermore, manual clamping is cumbersome and has a long testing cycle, failing to meet the demands of high-efficiency, automated mass production testing. Therefore, achieving automatic positioning, reliable clamping, and precise assembly of the frameless motor rotor with the stator is a pressing technical problem that needs to be solved in the field of motor testing. Summary of the Invention

[0004] Addressing the technical challenges of automatic clamping and positioning, and low assembly accuracy, in existing frameless motor testing technologies, this application provides a device for automatic positioning testing of frameless motors. This device utilizes a fixed rotor tensioning spindle with a tapered inclined surface, coupled with an axially movable rotor tensioning sleeve. Vertical stroke triggers the radial expansion of elastic flaps, achieving automatic tensioning and positioning of the rotor under test. Simultaneously, an assembly drive mechanism propels the rotor into the stator cavity, facilitating dynamic performance testing of the motor in conjunction with a performance testing mechanism. This solution significantly improves the consistency of frameless motor clamping, effectively preventing collisions during stator and rotor assembly, and providing a reliable hardware foundation for automated testing.

[0005] This invention provides an apparatus for automatic positioning testing of frameless motors, comprising:

[0006] A fixed base, on which a stator positioning seat for fixing the sample to be measured is provided;

[0007] An automatic clamping mechanism includes a rotor expansion spindle and a rotor expansion sleeve that is axially movable and sleeved on the rotor expansion spindle; the rotor expansion spindle is axially fixed to a fixed base; the rotor expansion sleeve has multiple elastic flaps distributed circumferentially, and the rotor to be tested is sleeved on the rotor expansion sleeve; the rotor expansion spindle and the rotor expansion sleeve have a mutually contacting inclined surface fit structure.

[0008] The assembly drive mechanism is used to drive the rotor expansion sleeve to move axially along the rotor expansion main shaft, and use the radial force generated by the inclined surface mating structure to drive the elastic flap to expand radially to lock the rotor under test, and drive the rotor under test into the central cavity of the rotor under test to complete the assembly.

[0009] The performance testing mechanism includes a loading motor and sensors. The performance testing mechanism is connected to the rotor expansion sleeve and is used to drive the rotor under test to rotate in the assembled state.

[0010] In some embodiments, the system further includes a positioning spindle, which is rotatably connected to the fixed base via a first bearing and is axially fixed; the rotor expansion spindle is fixedly connected to the positioning spindle.

[0011] The lower end of the rotor expansion sleeve is fixedly connected to an expansion connecting shaft, which is connected to the assembly drive mechanism and the performance testing mechanism respectively.

[0012] In some embodiments, the positioning spindle and the rotor tightening spindle are fixedly connected by a positioning pin; the middle sidewall of the tightening connecting shaft is provided with a sliding groove for extending axially, and the positioning pin passes through the sliding groove so that the tightening connecting shaft can slide axially relative to the positioning spindle and rotate synchronously in the circumferential direction.

[0013] In some embodiments, the fixed base is further provided with a guide sleeve, which is coaxially arranged with the expansion connecting shaft; during the axial movement of the expansion connecting shaft, the expansion connecting shaft enters the guide sleeve for limiting and guiding.

[0014] In some embodiments, the guide sleeve is a graphite copper sleeve or a rolling bearing.

[0015] In some embodiments, the rotor expansion sleeve includes:

[0016] The expansion section is provided with multiple elastic flaps separated by expansion gaps. The inner side of each elastic flap is provided with a tapered inclined surface. When the elastic flap is squeezed by the rotor expansion shaft, it expands radially to lock the rotor to be tested.

[0017] A limiting step is provided on the outer periphery of the elastic lobe for contacting the bottom end face of the rotor to be tested;

[0018] A connecting flange is located at the bottom end of the rotor expansion sleeve and is used for fixed connection with the expansion connecting shaft.

[0019] In some embodiments, the inclined surface mating structure includes a tapered inclined surface disposed on the inner side of the elastic flap, and the top end of the rotor tensioning main shaft is used to abut against the tapered inclined surface; or, the inclined surface mating structure includes a tapered inclined surface disposed on the outer periphery of the rotor tensioning main shaft, and the inner side of the elastic flap is used to abut against the tapered inclined surface.

[0020] In some embodiments, the assembly drive mechanism includes a lifting motor, a ball screw assembly, and a moving platform driven by the ball screw assembly, wherein the tensioning connecting shaft is rotatably connected to the moving platform and axially fixed via a second bearing.

[0021] In some embodiments, a support base plate is also included, and the lifting motor is fixed to the support base plate;

[0022] The assembly drive mechanism also includes a guide shaft, the bottom end of which is fixed to the support base plate; the moving platform is slidably sleeved on the guide shaft.

[0023] In some embodiments, the stator positioning seat is equipped with a stator clamping cylinder assembly for fixing the stator to be measured radially.

[0024] Compared with the prior art, the advantages and positive effects of the present invention are:

[0025] The aforementioned device for automatic positioning testing of frameless motors utilizes a fixed rotor tensioning spindle in conjunction with an axially movable rotor tensioning sleeve. The axial displacement triggers the radial expansion of the elastic flaps, achieving automatic rotor positioning and clamping. This device simultaneously completes rotor centering, radial clamping, and axial assembly of the stator and rotor through a single axial displacement stroke, achieving linkage between clamping and assembly actions and effectively ensuring consistent clamping force. Furthermore, the inclined surface constraint of the rotor tensioning spindle ensures high coaxiality of the rotor during rotation testing. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a perspective view of the device for automatic positioning testing of frameless motors according to the present invention;

[0028] Figure 2 This is a cross-section of the device for automatic positioning testing of frameless motors according to the present invention. Figure 1 The diagram shows the initial state;

[0029] Figure 3 This is a cross-section of the device for automatic positioning testing of frameless motors according to the present invention. Figure 2 The diagram shows the state of the stator and rotor after assembly.

[0030] Figure 4 This is a schematic diagram of the structure of the rotor under test, rotor expansion sleeve, and expansion connecting shaft in the device for automatic positioning testing of frameless motors according to the present invention;

[0031] Figure 5 This is a schematic diagram of the rotor expansion sleeve in the device for automatic positioning testing of frameless motors according to the present invention;

[0032] Figure 6 for Figure 5 Cross-sectional view;

[0033] Explanation of reference numerals in the attached figures:

[0034] 100 - Test piece; 200 - Test rotor;

[0035] 1-Fixed base; 11-Stator positioning base; 12-Stator clamping cylinder assembly;

[0036] 2-Rotor tensioning spindle; 21-Positioning pin;

[0037] 3-Rotor expansion sleeve; 31-Expansion part; 311-Elastic flap; 312-Limiting step; 313-Conical transition structure; 314-Slotted hollow seat; 32-Connecting flange part;

[0038] 4-Positioning spindle;

[0039] 5-Expansion connecting shaft; 51-Slide groove;

[0040] 6-Guide sleeve;

[0041] 71-Lifting motor; 72-Ball screw assembly; 73-Mobile platform;

[0042] 81-Support base plate; 82-Shock-absorbing pad; 83-Guide shaft; 84-Guide sleeve;

[0043] 91-Loading motor; 92-Reducer; 93-Torque sensor; 94-Rotating spindle; 95-First coupling; 96-Second coupling; 97-Third coupling;

[0044] 101 - First bearing; 102 - Second bearing; 103 - Third bearing. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0047] In the description of this invention, 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0048] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0049] Reference Figures 1-6 These are some embodiments of the device for automatic positioning and testing of frameless motors according to the present invention, which realizes automatic rotor positioning, assembly and dynamic testing of frameless motors.

[0050] join Figure 1 The device includes a fixed base 1, an automatic clamping mechanism, an assembly drive mechanism, and a performance testing mechanism.

[0051] The fixed base 1 serves as the supporting reference for the entire machine and is a fixed platform. The stator positioning base 11 is located above the fixed base 1 and is used to support the stator 100 to be measured.

[0052] An automatic clamping mechanism is used for positioning the rotor 200 to be tested, including a rotor tensioning spindle 2 and a rotor tensioning sleeve 3.

[0053] The rotor tensioning spindle 2 is axially fixed relative to the fixed seat 1.

[0054] The rotor expansion sleeve 3 is provided with multiple elastic petals 311 distributed along the circumference. The rotor expansion sleeve 3 changes its radial dimension through the elastic deformation of the elastic petals 311. The rotor expansion sleeve 3 is sleeved on the outer periphery of the rotor expansion main shaft 2.

[0055] The rotor tensioning spindle 2 and the rotor tensioning sleeve 3 are provided with a beveled surface mating structure that contacts each other.

[0056] The combined drive mechanism is connected to the rotor expansion sleeve 3 and is used to drive the rotor expansion sleeve 3 to move axially along the rotor expansion main shaft 2.

[0057] The performance testing mechanism includes a loading motor 91 and sensors. The performance testing mechanism is connected to the rotor tensioning sleeve 3 and is used to drive the rotor 200 under test to rotate in the assembled state.

[0058] In terms of working principle, the rotor to be tested 200 is first fitted onto the rotor expansion sleeve 3. For example... Figure 2 As shown, the assembly drive mechanism starts and drives the rotor expansion sleeve 3 to move downward. As the displacement increases, the elastic petals 311 inside the rotor expansion sleeve 3 gradually contact and press against the rotor expansion shaft 2. The radial force generated by the inclined surface fit structure between the two drives the elastic petals 311 to expand radially, thereby applying an expansion force from the inner circumference of the rotor 200 under test to the outside, firmly locking the rotor 200 under test onto the rotor expansion sleeve 3. At the same time, the locked rotor 200 under test then enters the center of the rotor 100 under test on the stator positioning seat 11, completing the assembly. After the assembly is completed, the performance testing mechanism drives the rotor to rotate for testing.

[0059] The aforementioned device for automatic positioning testing of frameless motors utilizes a fixed rotor tensioning spindle 2 in conjunction with an axially movable rotor tensioning sleeve 3. The axial displacement stroke triggers the radial expansion of the elastic flap 311, achieving automatic rotor positioning and clamping. This device simultaneously completes rotor centering, radial clamping, and axial assembly of the stator and rotor through a single axial displacement stroke, realizing the linkage between clamping and assembly actions and effectively ensuring the consistency of clamping force. Furthermore, the inclined surface constraint of the rotor tensioning spindle 2 ensures high coaxiality of the rotor during rotation testing.

[0060] In some embodiments, the device further includes a positioning spindle 4. The positioning spindle 4 is rotatably connected to the fixed base 1 via a first bearing 101, and the positioning spindle 4 is axially fixed on the fixed base 1. The positioning spindle 4 is fixed to the lower side of the fixed base 1, and the rotor tensioning spindle 2 is coaxially arranged with the positioning spindle 4. The rotor tensioning spindle 2 is located in the internal space of the positioning spindle 4, and the lower end of the rotor tensioning spindle 2 is fixed to the positioning spindle 4, thereby enabling the positioning spindle 4 to rotate synchronously with the rotor tensioning spindle 2.

[0061] The lower end of the rotor expansion sleeve 3 is fixedly connected to an expansion connecting shaft 5. The upper part of the expansion connecting shaft 5 is a hollow tubular structure and is sleeved inside the positioning main shaft 4, while the upper end of the expansion connecting shaft 5 is nested around the outer circumference of the rotor expansion main shaft 2. The expansion connecting shaft 5 is connected to both the assembly drive mechanism and the performance testing mechanism. The performance testing mechanism is used to drive the expansion connecting shaft 5 to generate circumferential rotational power, and the assembly drive mechanism is used to drive the expansion connecting shaft 5 to move up and down reciprocally within the gap between the positioning main shaft 4 and the rotor expansion main shaft 2. Through the axial movement of the expansion connecting shaft 5, the rotor expansion sleeve 3 is displaced relative to the rotor expansion main shaft 2, thereby triggering the expansion or contraction of the elastic flap 311.

[0062] Furthermore, to resolve the coupling relationship between rotational power transmission and axial sliding displacement, the positioning spindle 4 and the rotor tightening spindle 2 are fixed together by a positioning pin 21. Figure 4 As shown, the middle sidewall of the clamping connecting shaft 5 has an axially extending groove 51. The positioning pin 21 passes through the groove 51 and is connected to the positioning main shaft 4 and the rotor clamping main shaft 2, respectively. When the assembly drive mechanism drives the clamping connecting shaft 5 to move downward to clamp the rotor, the groove 51 slides axially relative to the positioning pin 21. When the performance testing mechanism drives the clamping connecting shaft 5 to rotate, the sidewall of the groove 51 abuts against the positioning pin 21 and drives the positioning pin 21 to rotate around the axis, thereby driving the positioning main shaft 4 and the rotor clamping main shaft 2 to rotate synchronously in the circumferential direction with the clamping connecting shaft 5. Through the cooperation between the positioning pin 21 and the groove 51, the device has axial freedom while locking the circumferential freedom, maintaining reliable transmission of rotational power, and ensuring that the rotor can receive torque from the performance testing mechanism in the clamped state.

[0063] In some other embodiments, the fit between the locating pin 21 and the slide groove 51 can also be replaced by a spline joint connection. By providing an external spline on the outer wall of the locating spindle 4 and an internal spline on the inner wall of the expansion connecting shaft 5, the functions of axial sliding and circumferential torque transmission can also be achieved.

[0064] In some embodiments, a guide sleeve 6 is further provided on the fixed base 1. The guide sleeve 6 is a self-lubricating guide sleeve. The guide sleeve 6 and the expansion connecting shaft 5 are coaxially arranged. During the axial movement of the expansion connecting shaft 5 with the assembly drive mechanism, the outer cylindrical surface of the expansion connecting shaft 5 slides within the guide sleeve 6. The guide sleeve 6 provides radial limiting and guidance for the expansion connecting shaft 5, thereby ensuring precise fit between the stator and rotor.

[0065] Furthermore, the guide sleeve 6 is preferably a graphite copper sleeve. The graphite copper sleeve utilizes the strength of the copper substrate and the self-lubricating properties of graphite to ensure smooth sliding of the expansion connecting shaft 5 without the need for additional lubricating oil. Since the testing environment for frameless motors requires high cleanliness, the graphite copper sleeve prevents lubricating oil from overflowing and contaminating the motor windings or magnets.

[0066] In some other embodiments, the guide sleeve 6 may also be a polytetrafluoroethylene composite bushing or a ceramic guide sleeve. In other embodiments, the guide sleeve 6 may also be a linear bearing with a guiding function, such as a rolling bearing.

[0067] In some embodiments, such as Figure 5 and Figure 6 As shown, the rotor expansion sleeve 3 sets are hollow cylindrical in shape, including expansion part 31 and connecting flange part 32.

[0068] The tightening part 31 is located at the upper part of the tightening sleeve and consists of six elastic petals 311 evenly distributed circumferentially. An axially extending tightening gap is provided between the elastic petals 311. An axial through hole is provided at the center of each elastic petal 311 for the tightening spindle to pass through, and the inner wall of the through hole has a tapered inclined surface a that is thinner at the top and thicker at the bottom. The top end of the rotor tightening spindle 2 abuts against the tapered inclined surface, forming a tapered fit structure, which allows the elastic petals 311 to expand radially, thus achieving centering and locking of the inner diameter of the rotor 200 to be tested. For easier insertion, the top end of the rotor tightening spindle 2 can also be provided with an inclined surface.

[0069] The upper part of the tensioning part 31 is a cylindrical structure, which is used to fit the rotor 200 to be tested.

[0070] A limiting step 312 is provided at the middle position of the tightening part 31. The outer side wall of the elastic flap 311 extends outward to form an annular limiting step 312. The top surface of the limiting step 312 is horizontal, serving as an axial support reference after the rotor 200 under test is fitted in, to ensure that the axial position of the rotor 200 under test remains constant during the tightening process.

[0071] The tightening part 31 forms a conical transition structure 313 on the lower side of the limiting step 312. The diameter of this structure gradually narrows from top to bottom, forming an inverted frustum structure. The tightening gap extends from the top down through the limiting step 312 and to the conical transition part, ensuring that the elastic flap 311 has sufficient radial displacement space when compressed.

[0072] The lower part of the tightening section 31 is a slotted hollow seat 314, which connects to the conical transition section. The sidewall of the slotted hollow seat 314 has multiple elongated unloading grooves that communicate with the tightening gap. The width of the unloading groove is greater than the width of the tightening gap. By increasing the effective deformation length of the elastic flap 311 at its root, the unloading groove reduces the driving force required for the radial expansion of the elastic flap 311 and avoids excessive stress concentration at the root, thereby improving the cycle life of the tightening sleeve. The tightening gap and the unloading groove together constitute a complete elastic deformation zone.

[0073] The connecting flange 32 is located at the bottom of the rotor expansion sleeve 3. The connecting flange 32 is disc-shaped, and its outer diameter is larger than that of the slotted hollow seat 314. Multiple connecting bolt holes are evenly distributed around the bottom connecting flange 32. Through the connecting bolt holes, the expansion sleeve can be rigidly fixed to the expansion connecting shaft 5 below, ensuring stable torque transmission during the test.

[0074] The expansion sleeve is manufactured as a single piece. The gap at the top and the unloading groove at the bottom work together to give the expansion sleeve high rotational rigidity and good radial flexibility, allowing it to accurately fit the inner diameter tolerance of the rotor 200 under test.

[0075] In other embodiments, a tapered inclined surface can be provided on the outer periphery of the rotor tensioning spindle 2, and the inner side of the elastic flap 311 abuts against the tapered inclined surface to form an inclined surface mating structure.

[0076] In some embodiments, the assembly drive mechanism includes a lifting motor 71, a ball screw assembly 72, and a moving platform 73. The lifting motor 71 drives the ball screw assembly 72 to rotate, thereby causing the moving platform 73 to move up and down vertically. The tensioning connecting shaft 5 is mounted on the moving platform 73 via a second bearing 102. The tensioning connecting shaft 5 is fixed to the inner ring of the second bearing 102, and the outer ring of the second bearing 102 is fixed to the moving platform 73 via a bearing seat, thereby allowing the tensioning connecting shaft 5 to move axially with the moving platform 73 and to rotate freely on the moving platform 73.

[0077] In some embodiments, the device further includes a support base plate 81. A lifting motor 71 is mounted on the support base plate 81. The assembly drive mechanism is also equipped with a guide shaft 83. The bottom end of the guide shaft 83 is fixed to the support base plate 81, and the top end is fixedly connected to the fixed seat 1. The moving platform 73 is slidably fitted onto the guide shaft 83 via a guide sleeve 84. The guide sleeve 84 can also be made of graphite copper. In this embodiment, four guide shafts 83 are provided, symmetrically arranged around the automatic clamping mechanism. The symmetrical arrangement of the guide shafts 83 enhances the stability of the moving platform 73 during lifting, thereby ensuring that the rotor tension sleeve 3 does not shift during pressing down, maintaining the coaxiality of the rotor and stator.

[0078] In some embodiments, the stator positioning seat 11 is equipped with a stator clamping cylinder assembly 12. This assembly secures the stator 100 to be measured radially. The stator clamping cylinder assembly 12 drives the clamping blocks to converge towards the center using air pressure, thereby locking the outer wall of the stator 100 to be measured.

[0079] The cylinder-driven radial clamping mechanism can quickly adapt to stator housings of different diameters. The radial clamping force can be precisely controlled by a pneumatic regulating valve, ensuring that the stator does not shift during test rotation and preventing excessive clamping force from deforming the stator laminations.

[0080] In some embodiments, the sensor in the performance testing mechanism is a torque sensor 93. The loading motor 91 is coupled to the tensioning connecting shaft 5 via the reducer 92 and the torque sensor 93. During the testing phase after assembly, the loading motor 91 outputs torque, which is amplified by the reducer 92 and then transmitted to the tensioning connecting shaft 5 via the torque sensor 93.

[0081] The torque sensor 93 can monitor the output torque of the motor under test at different speeds in real time, or be used as a load motor to test the power generation performance of the motor under test. The addition of the reducer 92 enables the device to test the motor characteristics under low-speed, high-torque conditions, meeting the performance verification requirements of frameless torque motors under heavy load conditions.

[0082] Furthermore, a rotating spindle 94 is connected between the torque sensor 93 and the expansion connecting shaft 5. The upper end of the rotating spindle 94 is connected to the expansion connecting shaft 5 via a first coupling 95; the lower end of the rotating spindle 94 is connected to the torque sensor 93 via a second coupling 96. To ensure the stability of the rotating spindle 94, it can be connected to the moving platform 73 via a third bearing 103 and a connecting plate. The torque sensor 93 and the reducer 92 are connected via a third coupling 97.

[0083] In other embodiments, the sensor may also integrate an encoder or resolver sensor to provide feedback on the real-time position and speed information of the rotor, enabling closed-loop testing of all parameters of the motor.

[0084] In some other embodiments, the support base plate 81 may also be equipped with a shock-absorbing pad 82 to absorb minor vibrations generated when the motor rotates at high speed.

[0085] In other embodiments, the assembly drive mechanism may also be hydraulically driven or pneumatically servo driven.

[0086] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by the present invention.

Claims

1. A device for automatic positioning testing of frameless motors, characterized in that, include: A fixed base, on which a stator positioning seat for fixing the sample to be measured is provided; An automatic clamping mechanism includes a rotor expansion spindle and a rotor expansion sleeve that is axially movable and sleeved on the rotor expansion spindle; the rotor expansion spindle is axially fixed to a fixed base; the rotor expansion sleeve has multiple elastic flaps distributed circumferentially, and the rotor to be tested is sleeved on the rotor expansion sleeve; the rotor expansion spindle and the rotor expansion sleeve have a mutually contacting inclined surface fit structure. The assembly drive mechanism is used to drive the rotor expansion sleeve to move axially along the rotor expansion main shaft, and use the radial force generated by the inclined surface mating structure to drive the elastic flap to expand radially to lock the rotor under test, and drive the rotor under test into the central cavity of the rotor under test to complete the assembly. A performance testing mechanism, including a loading motor and sensors, is connected to the rotor expansion sleeve and is used to drive the rotor under test to rotate in the assembled state. A positioning spindle is rotatably connected to the fixed seat via a first bearing and is axially fixed; a rotor expansion spindle is fixedly connected to the positioning spindle; an expansion connecting shaft is fixedly connected to the lower end of the rotor expansion sleeve, and the expansion connecting shaft is respectively connected to the assembly drive mechanism and the performance testing mechanism. The positioning spindle and the rotor expansion spindle are fixedly connected by a positioning pin; the middle side wall of the expansion connecting shaft is provided with a sliding groove for extending axially, and the positioning pin passes through the sliding groove so that the expansion connecting shaft can slide axially relative to the positioning spindle and rotate synchronously in the circumferential direction. The rotor expansion sleeve includes: The expansion section is provided with multiple elastic flaps separated by expansion gaps. When the elastic flaps are squeezed by the rotor expansion shaft, they expand radially to lock the rotor under test. A limiting step is provided on the outer periphery of the elastic lobe for contacting the bottom end face of the rotor to be tested; A connecting flange is located at the bottom end of the rotor expansion sleeve and is used for fixed connection with the expansion connecting shaft; The assembly drive mechanism includes a lifting motor, a ball screw assembly, and a moving platform driven by the ball screw assembly. The tensioning connecting shaft is rotatably connected to the moving platform and axially fixed through a second bearing.

2. The device for automatic positioning testing of frameless motors according to claim 1, characterized in that, The fixed base is also provided with a guide sleeve, which is coaxially arranged with the expansion connecting shaft; during the axial movement of the expansion connecting shaft, the expansion connecting shaft enters the guide sleeve for limiting and guiding.

3. The device for automatic positioning testing of frameless motors according to claim 2, characterized in that, The guide sleeve is a graphite copper sleeve or a rolling bearing.

4. The device for automatic positioning testing of frameless motors according to claim 1, characterized in that, The inclined surface mating structure includes a tapered inclined surface disposed on the inner side of the elastic flap, and the top end of the rotor tensioning main shaft is used to abut against the tapered inclined surface; or, the inclined surface mating structure includes a tapered inclined surface disposed on the outer periphery of the rotor tensioning main shaft, and the inner side of the elastic flap is used to abut against the tapered inclined surface.

5. The apparatus for automatic positioning testing of frameless motors according to claim 1, characterized in that, It also includes a support base plate, on which the lifting motor is fixed; The assembly drive mechanism also includes a guide shaft, the bottom end of which is fixed to the support base plate; the moving platform is slidably sleeved on the guide shaft.

6. The apparatus for automatic positioning testing of frameless motors according to claim 1, characterized in that, The stator positioning seat is equipped with a stator clamping cylinder assembly for fixing the stator to be measured radially.

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