Fixed fixture for motor stall test

Abstract

The present invention relates to the technical field of motor detection, and provides a fixed fixture for motor stall test, including a positioning base and a clamping mechanism, wherein the positioning base has a housing cavity for accommodating the clamping mechanism, and the clamping mechanism includes a screw rod hinged to the inner wall of the housing cavity and capable of rotating around its own central axis, and two clamping arm assemblies sleeved on the screw rod and arranged opposite to each other. When the screw rod rotates clockwise around the axis, the two clamping arm assemblies move toward each other in the housing cavity to apply a bidirectional force to the rotor part of the motor to achieve the purpose of locking; when the screw rod rotates counterclockwise around the axis, the two clamping arm assemblies move away from each other in the housing cavity to unlock the rotor part. In summary, the fixed fixture of the present application can apply a force to the rotor part of the motor from two opposite directions, thereby improving the centering efficiency of the rotor part of the motor. At the same time, the bidirectional force has a higher limiting stability on the rotor part of the motor.

Description

Technical Field

[0001] The invention relates to the technical field of motor detection, and in particular provides a fixed tool for motor stall test. Background Art

[0002] Motor stall performance is an important part of motor performance testing. Motor stall refers to a state in which the motor still outputs torque at zero speed. It simulates the phenomenon that the motor cannot start or stops rotating due to excessive motor overload. The motor stall test is to measure the stall current I at rated voltage. k and the stall torque value T k And the stall loss P k At the same time, the stall characteristic curve is measured to reflect some quality problems of the motor.

[0003] The working principle of the fixed fixture for motor stall test is to fix the stator and rotor of the motor separately, overcome the torque of the motor at rated voltage, ensure that the rotor does not rotate, simulate the stall state, and facilitate the measurement of corresponding data.

[0004] However, the existing fixed fixture alignment accuracy of the motor stall test is poor, which leads to the problem of reduced stability of the motor rotor clamping during the test. Summary of the invention

[0005] The purpose of the present invention is to provide a fixing fixture for a motor stall test, aiming to solve the problem of poor stability of the motor rotor clamping caused by the existing fixing fixture.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a fixed tool for motor stall test, comprising a positioning base for limiting the stator part of the motor and a clamping mechanism arranged on the positioning base and used for limiting the rotor part of the motor, the positioning base has an accommodating cavity for accommodating the clamping mechanism, the clamping mechanism comprises a screw rod hinged to the inner wall of the accommodating cavity and capable of rotating around its own central axis, and two clamping arm assemblies sleeved on the screw rod and arranged oppositely; when the screw rod rotates around the axis, the two clamping arm assemblies move toward each other to lock the rotor part of the motor; or, the two clamping arm assemblies move away from each other to unlock the rotor part of the motor.

[0007] Beneficial effects of the present invention: The fixed fixture for the motor stall test provided by the present invention has the following working process: the stator part of the motor is limited on the positioning base to ensure that the stator part does not move. The rotor part of the motor is limited by a clamping mechanism. Specifically, a accommodating cavity is opened on the positioning base, and the clamping mechanism is installed in the accommodating cavity. Among them, the clamping mechanism includes a screw rod hinged to the inner wall of the accommodating cavity and two clamping arm assemblies sleeved on the screw rod. It is defined here that when the screw rod rotates clockwise around the axis, the two clamping arm assemblies move toward each other in the accommodating cavity to apply a bidirectional force to the rotor part of the motor to achieve the purpose of locking; when the screw rod rotates counterclockwise around the axis, the two clamping arm assemblies move away from each other in the accommodating cavity, thereby unlocking the rotor part. In summary, the fixed fixture of the present application can apply a force to the rotor part of the motor from two opposite directions, thereby improving the centering efficiency of the rotor part of the motor. At the same time, the bidirectional force has a higher limiting stability on the rotor part of the motor.

[0008] In one embodiment, the screw rod has a forward tooth segment and a reverse tooth segment, wherein one of the clamping arm assemblies cooperates with the forward tooth segment, and the other of the clamping arm assemblies cooperates with the reverse tooth segment.

[0009] In one embodiment, the screw rod includes a first sub-rod and a second sub-rod arranged at intervals along the locking direction, the thread rotation direction of the first sub-rod is opposite to the thread rotation direction of the second sub-rod, and the first sub-rod and the second sub-rod can rotate around the axis independently; one of the clamping arm assemblies cooperates with the first sub-rod, and the other clamping arm assembly cooperates with the second sub-rod.

[0010] In one embodiment, the screw rod comprises a coupling, and the first sub-rod is connected to the second sub-rod via the coupling.

[0011] In one embodiment, the clamping arm assembly includes a connecting block sleeved on the screw rod, a clamping claw provided on the connecting block, and a guiding structure provided in the accommodating cavity and adapted to the connecting block, wherein the guiding direction of the guiding structure is parallel to the locking direction.

[0012] In one embodiment, the connecting block includes a block body and a nut disposed on the block body, and the nut is sleeved on the screw rod.

[0013] In one embodiment, a waist-shaped mounting hole is provided on the connection block, the clamping jaw is fixed in the waist-shaped mounting hole by means of screws, and the length direction of the waist-shaped mounting hole is perpendicular to the locking direction.

[0014] In one embodiment, the clamping mechanism further includes a rotating handle mounted on the screw rod.

[0015] In one embodiment, the positioning base includes a base body and a pressure plate covering the base body, and the base body is provided with the accommodating cavity; the base body is also provided with a first limiting groove structure for accommodating the stator part of the motor, and the pressure plate is provided with a second limiting groove structure for accommodating the stator part of the motor.

[0016] In one embodiment, the positioning base further includes a positioning structure, and the pressure plate is covered on the base body through the positioning structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a fixed tooling for a motor stall test provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the structure of a clamping mechanism of a fixed tooling for a motor stall test provided by an embodiment of the present invention;

[0020] Figure 3 Another structural schematic diagram of the clamping mechanism of the fixed tooling for the motor stall test provided by an embodiment of the present invention;

[0021] Figure 4 An exploded view of a fixed fixture for a motor stall test provided in an embodiment of the present invention.

[0022] Among them, the reference numerals in the figure are:

[0023] 10. Positioning base; 20. Clamping mechanism; 10a. Accommodating chamber; 21. Screw rod; 22. Clamping arm assembly; 211. First sub-rod; 212. Second sub-rod; 213. Coupling; 221. Connecting block; 222. Clamping claw; 223. Guide structure; 2211. Block; 2212. Nut; 22a. Waist-shaped mounting hole; 23. Rotating handle; 11. Base; 12. Pressing plate; 11a. First limiting groove structure; 12a. Second limiting groove structure; 13. Positioning structure. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Please refer to Figure 1 , Figure 2 and Figure 4The fixed fixture for the motor stall test of the present application includes a positioning base 10 for limiting the stator part of the motor and a clamping mechanism 20 arranged on the positioning base 10 and used to limit the rotor part of the motor. The positioning base 10 has a housing chamber 10a for accommodating the clamping mechanism 20, and the clamping mechanism 20 includes a screw 21 hinged to the inner wall of the housing chamber 10a and capable of rotating around its own central axis, and two clamping arm assemblies 22 sleeved on the screw 21 and arranged oppositely; when the screw 21 rotates around the axis, the two clamping arm assemblies 22 move toward each other to lock the rotor part of the motor; or, the two clamping arm assemblies 22 move back to back to unlock the rotor part of the motor. It can be understood that the screw 21 and the clamping arm assembly 22 are combined to form a screw mechanism, that is, when the screw 21 rotates around the axis, the clamping arm assembly 22 moves horizontally on the screw 21 along the axial direction of the screw 21, that is, the rotation of the screw 21 around the axis is converted into the linear motion of the clamping arm assembly 22. In this way, when the rotor part of the motor is limited, the rotor part is subjected to two forces in opposite directions, so that rapid alignment can be achieved. At the same time, opposite forces are applied to the rotor part, and the clamping force is also increased, which greatly improves the stability of the limited rotor part.

[0029] At the same time, driven by the screw rod 21 , the two clamping arm assemblies 22 can move toward each other at the same time, or move away from each other at the same time; or, the two clamping arm assemblies 22 can move independently of each other.

[0030] The fixed fixture for the motor stall test provided by the present invention has the following working process: the stator part of the motor is limited on the positioning base 10 to ensure that the stator part does not move. The rotor part of the motor is limited by the clamping mechanism 20. Specifically, a accommodating cavity 10a is opened on the positioning base 10, and the clamping mechanism 20 is installed in the accommodating cavity 10a. Among them, the clamping mechanism 20 includes a screw rod 21 hinged to the inner wall of the accommodating cavity 10a and two clamping arm assemblies 22 sleeved on the screw rod 21. It is defined here that when the screw rod 21 rotates clockwise around the axis, the two clamping arm assemblies 22 move toward each other in the accommodating cavity 10a, so as to apply a bidirectional force to the rotor part of the motor to achieve the purpose of locking; when the screw rod 21 rotates counterclockwise around the axis, the two clamping arm assemblies 22 move away from each other in the accommodating cavity 10a, thereby unlocking the rotor part. In summary, the fixing fixture of the present application can exert forces on the rotor part of the motor from two opposite directions, thereby improving the centering efficiency of the rotor part of the motor. At the same time, the bidirectional force has a higher limiting stability on the rotor part of the motor.

[0031] In one embodiment, when the screw rod 21 is an integral structure, at this time, the two clamping arm assemblies 22 mounted on the screw rod 21 can move toward or away from each other at the same time. Specifically, the screw rod 21 has a forward tooth segment and a reverse tooth segment, wherein one clamping arm assembly 22 cooperates with the forward tooth segment, and the other clamping arm assembly 22 cooperates with the reverse tooth segment. It can be understood that the two clamping arm assemblies 22 cooperate with the forward tooth segment and the reverse tooth segment, respectively, to obtain motion trajectories in opposite directions. That is, when the screw rod 21 rotates clockwise or counterclockwise, the two clamping arm assemblies 22 can achieve simultaneous movement toward and away from each other. In this way, applying two forces in opposite directions to the two relative directions of the rotor part at the same time can reduce the moving distance of the rotor part during the centering process, thereby improving the centering clamping efficiency, and applying forces to the rotor part at the same time can prevent it from jumping, and the clamping stability is higher.

[0032] Please refer to Figure 1 and Figure 2 , which is different from the above-mentioned embodiment, is that the screw rod 21 is divided into two parts, and the two parts can move independently, that is, synchronous movement of moving toward or away from each other at the same time, or asynchronous movement of moving closer or farther away separately. Specifically, the screw rod 21 includes a first sub-rod 211 and a second sub-rod 212 spaced apart along the locking direction, where the axial direction of the first sub-rod 211 coincides with the axial direction of the second sub-rod 212, and also coincides with or is parallel to the locking direction of the rotor part. The thread rotation direction of the first sub-rod 211 is opposite to that of the second sub-rod 212, and the first sub-rod 211 and the second sub-rod 212 can rotate around the axis independently. It can be understood that, firstly, the first sub-rod 211 and the second sub-rod 212 do not interfere with each other in space and can rotate independently; secondly, in order to obtain the centering effect, the thread rotation direction of the first sub-rod 211 is opposite to the thread rotation direction of the second sub-rod 212, so that the clamping arm assembly 22 respectively mounted on the first sub-rod 211 and the clamping arm assembly 22 on the second sub-rod 212 can move toward or away from each other, and the centering process is more flexible, and the centering position can be fine-tuned, that is, the centering position of the rotor part can be adjusted by rotating the first sub-rod 211, or rotating the second sub-rod 212; or, rotating the first sub-rod 211 and the second sub-rod 212 at the same time.

[0033] Please refer to Figures 1 to 3In one embodiment, when the first sub-rod 211 and the second sub-rod 212 need to maintain synchronous rotation, they can be connected through the coupling 213, so that the two can rotate synchronously and form a whole. Specifically, the screw rod 21 includes a coupling 213, and the first sub-rod 211 is connected to the second sub-rod 212 through the coupling 213. It can be understood that the coupling 213 is used to connect the first sub-rod 211 and the second sub-rod 212, which can quickly adapt to the use scenario. Of course, when the first sub-rod 211 and the second sub-rod 212 need to be able to rotate around the axis independently, the coupling 213 can also be removed.

[0034] Please refer to Figure 2 and Figure 3 In one embodiment, the clamping arm assembly 22 includes a connecting block 221 sleeved on the screw rod 21, a clamping claw 222 provided on the connecting block 221, and a guide structure 223 provided in the accommodating cavity 10a and adapted to the connecting block 221, and the guiding direction of the guiding structure 223 is parallel to the locking direction. It can be understood that the connecting block 221 can rotate coaxially with the screw rod 21, however, under the limiting action of the guiding structure 223, the connecting block 221 slides along the guiding direction of the guiding structure 223, and the clamping claw 222 on the connecting block 221 limits the rotor part.

[0035] Optionally, the guide structure 223 includes a slide rail installed in the accommodating cavity 10a and a slider movably connected to the slide rail, and one end of the connecting block 221 is connected to the slider through a fastener so as to move with the slider.

[0036] For example, a clamping groove is provided on the clamping jaw 222, which is adapted to the shape of the rotor part. Specifically, the cross section of the clamping groove is triangular. It can be understood that the rotor part can be gathered under the action of the two oblique side walls of the clamping groove, so that the centering efficiency of the rotor part can be further improved.

[0037] Specifically, please refer to Figure 2 and Figure 3 The connecting block 221 includes a block body 2211 and a nut 2212 disposed on the block body 2211, and the nut 2212 is sleeved on the screw rod 21. Here, the nut 2212 cooperates with the screw rod 21, thereby driving the block body 2211 to move with the nut 2212.

[0038] Please refer to Figure 2 In one embodiment, a waist-shaped mounting hole 22a is provided on the connection block 221, and the clamping jaw 222 is fixed in the waist-shaped mounting hole 22a by screws, and the length direction of the waist-shaped mounting hole 22a is perpendicular to the locking direction. It can be understood that in the direction perpendicular to the locking direction, the position of the clamping jaw 222 on the connection block 221 can be adjusted according to the hole shape of the waist-shaped mounting hole 22a, so as to meet the height of different rotor parts, so as to improve the versatility of the fixing tool.

[0039] Please refer to Figure 2 and Figure 3 In one embodiment, the clamping mechanism 20 further includes a rotating handle 23 mounted on the screw rod 21. It can be understood that the screw rod 21 is driven to rotate around the axis by rotating the rotating handle 23 to provide rotational power to the screw rod 21. Of course, the screw rod 21 can also be directly connected to a power mechanism, such as an output shaft of a driving motor.

[0040] Please refer to Figure 1 and Figure 4 In one embodiment, the positioning base 10 includes a base body 11 and a pressure plate 12 covering the base body 11, and a receiving cavity 10a is provided on the base body 11; a first limiting groove structure 11a for accommodating the stator part of the motor is also provided on the base body 11, and a second limiting groove structure 12a for accommodating the stator part of the motor is provided on the pressure plate 12. It can be understood that the stator part of the motor is clamped up and down by the pressure plate 12 and the base body 11 to limit the stator part. Specifically, in order to prevent the stator part of the motor from sliding along the locking direction, a first limiting groove structure 11a is provided on the base body 11, and similarly, a second limiting groove structure 12a is provided on the pressure plate 12. Here, the first limiting groove structure 11a can be a groove with a triangular, trapezoidal or semicircular cross section, and the second limiting groove structure 12a can be a groove with a triangular, trapezoidal or semicircular cross section.

[0041] Please refer to Figure 4 In one embodiment, the positioning base 10 further includes a positioning structure 13, and the pressure plate 12 is covered on the base body 11 through the positioning structure 13. Here, the positioning structure 13 is a positioning column, and a positioning hole matching the positioning column is opened on the pressure plate 12, and the positioning column is installed on the base body 11. Alternatively, the positioning column is installed on the pressure plate 12, and a positioning hole is opened on the base body 11.

[0042] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fixed tool for motor stall test, characterized by: It comprises a positioning base for limiting the stator part of the motor and a clamping mechanism arranged on the positioning base and used for limiting the rotor part of the motor, the positioning base has an accommodating cavity for accommodating the clamping mechanism, the clamping mechanism comprises a screw rod hinged to the inner wall of the accommodating cavity and capable of rotating around its own central axis, and two clamping arm assemblies sleeved on the screw rod and arranged oppositely; when the screw rod rotates around the axis, the two clamping arm assemblies move towards each other to lock the rotor part of the motor; Alternatively, the two clamp arm assemblies move away from each other to unlock the rotor portion of the motor.

2. The fixed fixture for motor stall test according to claim 1, characterized in that: The screw rod has a forward tooth segment and a reverse tooth segment, wherein one clamping arm assembly cooperates with the forward tooth segment, and the other clamping arm assembly cooperates with the reverse tooth segment.

3. The fixed fixture for motor stall test according to claim 1, characterized in that: The screw rod includes a first sub-rod and a second sub-rod arranged at intervals along a locking direction, the thread rotation direction of the first sub-rod is opposite to that of the second sub-rod, and the first sub-rod and the second sub-rod can rotate around the axis independently; one of the clamping arm assemblies cooperates with the first sub-rod, and the other clamping arm assembly cooperates with the second sub-rod.

4. The fixed fixture for motor stall test according to claim 3, characterized in that: The screw rod comprises a coupling, and the first sub-rod is connected to the second sub-rod through the coupling.

5. The fixed fixture for motor stall test according to any one of claims 1 to 4, characterized in that: The clamping arm assembly includes a connecting block sleeved on the screw rod, a clamping claw arranged on the connecting block, and a guiding structure arranged in the accommodating cavity and adapted to the connecting block, wherein the guiding direction of the guiding structure is parallel to the locking direction.

6. The fixed fixture for motor stall test according to claim 5, characterized in that: The connecting block comprises a block body and a nut arranged on the block body, and the nut is sleeved on the screw rod.

7. The fixed fixture for motor stall test according to claim 5, characterized in that: The connecting block is provided with a waist-shaped mounting hole, the clamping claw is fixed in the waist-shaped mounting hole by means of screws, and the hole length direction of the waist-shaped mounting hole is perpendicular to the locking direction.

8. The fixed fixture for motor stall test according to any one of claims 1 to 4, characterized in that: The clamping mechanism also includes a rotating handle mounted on the screw rod.

9. The fixed fixture for motor stall test according to claim 1, characterized in that: The positioning base includes a base body and a pressure plate covering the base body, the base body is provided with the accommodating cavity; the base body is also provided with a first limiting groove structure for accommodating the stator part of the motor, and the pressure plate is provided with a second limiting groove structure for accommodating the stator part of the motor.

10. The fixed fixture for motor stall test according to claim 9, characterized in that: The positioning base also includes a positioning structure, and the pressure plate is covered on the base body through the positioning structure.

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