Frameless motor test tool

Abstract

The embodiment of the utility model relates to the technical field of motor testing, and particularly discloses a frameless motor testing tool, which comprises a rotating shaft, the rotating shaft comprises a mounting part, the mounting part is used for sleeving a rotor magnetic ring, and the periphery of one end of the mounting part is provided with a flange used for being matched with the front end surface of the rotor magnetic ring for limiting; and the limiting plate is detachably connected to the other end of the mounting part, and the limiting plate is used for being matched with the flange so as to clamp and fix the rotor magnetic ring on the mounting part. Through the above mode, the embodiment of the utility model can realize the repeated utilization of the test tool.

Description

Technical Field

[0001] The utility model relates to the technical field of motor testing, in particular to a frameless motor testing tool. Background Art

[0002] Frameless permanent magnet synchronous motors have the advantages of small size, light weight, small inertia, and can provide high power at high speed. At the same time, they can achieve higher torque under the action of various reducers. Frameless permanent magnet synchronous motors have been widely used in scenarios such as robot joints and medical equipment that require motors to work in a small space. Because frameless permanent magnet synchronous motors need to share bearings and housings with the equipment being loaded, they are designed without front and rear end covers, housings, bearings and other structures. In the existing technology, performance testing of frameless motors before shipment usually requires the use of external test fixtures.

[0003] The inventor of the utility model discovered that in the prior art, when testing a frameless motor before shipment, the frameless motor is usually assembled with a test tool by means of cold pressing or shrink fitting, and after the frameless motor is assembled and tested, it is difficult to disassemble the frameless motor from the test tool. If the frameless motor is disassembled forcibly, it is easy to cause partial damage to the frameless motor and make it impossible to ship. It may also damage the test tool, making it impossible to reuse the test tool. Utility Model Content

[0004] In view of the above problems, an embodiment of the utility model provides a frameless motor testing tool, which overcomes the problems that the above-mentioned existing frameless motor testing tool is usually non-detachable. If the frameless motor is forcibly disassembled after assembly and testing, it is easy to cause partial damage to the frameless motor and it cannot be shipped. The testing tool cannot be reused.

[0005] According to one aspect of the utility model, a frameless motor testing tool is provided, comprising: a rotating shaft, the rotating shaft comprising a mounting portion, the mounting portion being used to sleeve the rotor magnetic ring, and the outer periphery of one end of the mounting portion is provided with a flange for cooperating with the front end surface of the rotor magnetic ring to limit the position; and a limiting plate, the limiting plate being detachably connected to the other end of the mounting portion, and the limiting plate being used to cooperate with the flange to clamp and fix the rotor magnetic ring on the mounting portion.

[0006] In an optional manner, the frameless motor includes a stator, and the test tool also includes: a casing, provided with a accommodating cavity, in which the stator is inserted; a front end cover, which is arranged on the front end opening of the accommodating cavity, and the front end cover is connected to the casing; a rear end cover, which is arranged on the rear end opening of the accommodating cavity, and the rear end cover is connected to the casing; wherein the rotating shaft is arranged in a circular ring of the stator, and the rotating shaft includes connecting parts respectively connected to the front and rear ends of the mounting part, one of the connecting parts is rotatably connected to the front end cover, and the other of the connecting parts is rotatably connected to the rear end cover.

[0007] In an optional manner, at least two limiting holes are circumferentially spaced apart on the side wall of the casing, the limiting holes are connected to the accommodating cavity, a fastener is correspondingly arranged in the limiting holes, one end of the fastener extends into the accommodating cavity and is used to abut against the outer peripheral wall of the stator.

[0008] In an optional manner, the limiting hole is a threaded hole, and the fastener is a top screw.

[0009] In an optional manner, the number of the limiting holes is two, and the two limiting holes are circumferentially evenly spaced on the outer circumference of the housing.

[0010] In an optional manner, a first mounting groove is provided on the outer periphery of the mounting portion, the rotor magnetic ring portion is mounted in the first mounting groove, and the first mounting groove is formed by enclosing the flange and the limiting plate.

[0011] In an optional manner, a first connecting hole is provided on the mounting portion; a second connecting hole is provided on the limiting plate, and the second connecting hole is arranged opposite to the first connecting hole; the frameless motor testing tooling also includes a first screw, one end of the first screw passes through the second connecting hole and is screwed into the first connecting hole.

[0012] In an optional embodiment, the number of the second connecting holes is two, and the two second connecting holes are arranged on the limiting plate at equal intervals along the circumference of the rotating shaft; the number of the first connecting holes is two, and the two first connecting holes are arranged on the mounting portion at equal intervals along the circumference of the rotating shaft.

[0013] In an optional manner, the limiting plate is a circular ring structure, the limiting plate radially protrudes from the end surface of the mounting portion, and the connecting portion close to the rear end cover passes through the limiting plate and is connected to the rear end cover.

[0014] In an optional manner, a second mounting groove is provided on a side of the front end cover close to the accommodating cavity, and the second mounting groove is communicated with the accommodating cavity; a third mounting groove is provided on a side of the rear end cover close to the accommodating cavity, and the third mounting groove is communicated with the accommodating cavity; the frameless motor test fixture includes a first bearing and a second bearing, the first bearing is sleeved on a connecting portion close to the front end cover, and the first bearing is installed in the second mounting groove, the second bearing is sleeved on a connecting portion close to the rear end cover, and the second bearing is installed in the third mounting groove, and the first bearing and the second bearing are coaxially arranged.

[0015] In an optional manner, a third connecting hole is provided on the front end cover; a fourth connecting hole is provided on a side of the casing close to the front end cover, and the fourth connecting hole is arranged opposite to the third connecting hole; the frameless motor testing tooling includes a second screw, one end of the second screw passes through the third connecting hole and is screwed to the fourth connecting hole.

[0016] In an optional embodiment, a fifth connecting hole is provided on the rear end cover; a sixth connecting hole is provided on the side of the casing close to the rear end cover, and the sixth connecting hole is arranged opposite to the fifth connecting hole; the frameless motor testing tooling includes a third screw, one end of the third screw passes through the fifth connecting hole and is screwed to the sixth connecting hole.

[0017] In an optional manner, the axial diameter of the mounting portion is larger than the axial diameter of the connecting portion, and the axial diameter of the connecting portion close to the front end cover is larger than the axial diameter of the connecting portion close to the rear end cover.

[0018] In an optional manner, the frameless motor testing tool also includes an encoder, which is connected to one end of the rotating shaft close to the rear end cover, and is located on a side of the rear end cover away from the accommodating cavity, and the encoder rotates with the rotation of the rotating shaft.

[0019] In an optional manner, the frameless motor testing tool further includes an encoder outer cover, wherein the encoder outer cover is disposed on the encoder, and the encoder outer cover is detachably connected to the rear end cover.

[0020] The beneficial effect of the embodiment of the utility model is that, different from the prior art, the frameless motor test fixture provided by the embodiment of the utility model is provided with a rotating shaft and a limiting plate. Among them, the frameless motor includes a rotor magnetic ring, the rotating shaft includes a mounting portion, the mounting portion is used to sleeve the rotor magnetic ring, one end of the mounting portion is provided with a flange for cooperating with the front end surface of the rotor magnetic ring, the limiting plate is detachably connected to the other end of the mounting portion, the limiting plate is used to cooperate with the flange to clamp the rotor magnetic ring on the mounting portion, when the rotor magnetic ring on the frameless motor is tested by the fixture, the front and rear ends of the rotor magnetic ring are limited and fixed by the flange and the limiting plate, after the fixture test is completed, the limiting plate is removed from the rotating shaft, at this time, the rotor magnetic ring on the frameless motor can be removed from the test fixture, and will not cause damage to the frameless motor and the test fixture, thereby making the test fixture reusable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0022] Figure 1 It is a side sectional view of the overall structure of the frameless motor testing tooling of the embodiment of the utility model;

[0023] Figure 2 It is a side sectional view of a partial structure of a frameless motor testing tooling of an embodiment of the utility model;

[0024] Figure 3 It is a side sectional view of another part of the structure of the frameless motor testing tooling of the embodiment of the utility model;

[0025] Figure 4 It is a side sectional view of another part of the structure of the frameless motor testing tooling according to an embodiment of the utility model. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the utility model, the utility model is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

[0027] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by technicians in the technical field of the present invention. The terms used in this specification are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0028] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0029] It should be noted that: the embodiment of the present application is a test fixture for the frameless motor 50, such as Figure 1 As shown, the frameless motor 50 includes a stator 501 and a rotor magnetic ring 502 , and the rotor magnetic ring 502 is sleeved in the stator 501 .

[0030] See also Figure 1 The frameless motor testing tool 1000 includes a housing 10, a rotating shaft 20, a front cover 30, a rear cover 40, a limit plate 60, a first bearing 70, a second bearing 80, a first screw 90, a second screw 100, a third screw 110, an encoder 120 and an encoder outer cover 130. The front end cover 30 and the rear end cover 40 are both connected to the casing 10, the rotor assembly 50 is partially arranged in the casing 10, the limit plate 60 is detachably connected to the rotating shaft 20, the first bearing 70 is sleeved on one end of the rotating shaft 20, the first bearing 70 is installed on the front end cover 30, the second bearing 80 is sleeved on the other end of the rotating shaft 20, the second bearing 80 is installed on the rear end cover 40, the first screw 90 is used for connecting the limit plate 60 and the rotating shaft 20, the second screw 100 is used for connecting the front end cover 30 and the casing 10, the third screw 110 is used for connecting the rear end cover 40 and the casing 10, the encoder 120 is connected to the other end of the rotating shaft 20, the encoder outer cover 130 is covered on the encoder 120, and the encoder outer cover 130 is detachably connected to the rear end cover 40. The housing 10, the rotating shaft 20, the front cover 30, the rear cover 40, the limit plate 60, the first bearing 70, the second bearing 80, the first screw 90, the second screw 100, the third screw 110, the encoder 120 and the encoder outer cover 130 are described in detail below.

[0031] For the above-mentioned housing 10, front cover 30 and rear cover 40, as Figure 1 and Figure 2As shown, the housing 10 is provided with a accommodating cavity 10a, and the accommodating cavity 10a is used to insert the stator 501. The side wall of the housing 10 is circumferentially spaced with at least two limiting holes 103, and the limiting holes 103 are communicated with the accommodating cavity 10a. A fastener 10b is correspondingly provided in the limiting hole 103, and one end of the fastener 10b extends into the accommodating cavity 10a and is used to abut against the outer peripheral wall of the stator 501. The fastener 10b is used to limit and fix the stator 501 in the accommodating cavity 10a. The front cover 30 is provided to cover the front opening of the accommodating cavity 10a, and the rear cover 40 is provided to cover the rear opening of the accommodating cavity 10a. The connection between the front cover 30 and the rear cover 40 and the housing 10 can be detachable, and the two ends of the rotating shaft 20 respectively penetrate the front cover 30 and the rear cover 40, and the end of the rotating shaft 20 extending from the rear cover 40 can be installed with an encoder 120. Optionally, the limiting hole 103 is a threaded hole, and the fastener 10b is a top screw, and the top screw can be completely screwed into the housing 10.

[0032] In some embodiments, the number of the limiting holes 103 is two, and the two limiting holes 103 are circumferentially evenly spaced on the outer circumference of the housing 10 , and the two limiting holes 103 are circumferentially spaced 180 degrees apart.

[0033] It should be noted that: when the motor is working, one end of the shaft 20 is close to the external device, and one end of the shaft 20 is usually connected to the external device. Therefore, the front end of the housing 10 usually refers to the end of the motor connected to the external device, and the rear end of the housing 10 usually refers to the end of the motor away from the external device.

[0034] In some embodiments, a second mounting groove 30 a is provided on one side of the front end cover 30 close to the accommodating cavity 10 a , the second mounting groove 30 a is communicated with the accommodating cavity 10 a , and the second mounting groove 30 a is used to install the first bearing 70 .

[0035] In some embodiments, a third connecting hole 301 is provided on the front end cover 30, and a fourth connecting hole 101 is provided on the side of the housing 10 close to the front end cover 30. The fourth connecting hole 101 is arranged opposite to the third connecting hole 301, and the third connecting hole 301 and the fourth connecting hole 101 are used for the second screw 100 to pass through and connect to realize a detachable connection between the front end cover 30 and the housing 10.

[0036] In some embodiments, a third mounting groove 40 a is provided on one side of the rear end cover 40 close to the accommodating cavity 10 a , the third mounting groove 40 a is communicated with the accommodating cavity 10 a , and the third mounting groove 40 a is used to install the second bearing 80 .

[0037] In some embodiments, a fifth connecting hole 401 is provided on the rear end cover 40, and a sixth connecting hole 102 is provided on the side of the housing 10 close to the rear end cover 40, and the sixth connecting hole 102 is arranged opposite to the fifth connecting hole 401, and the fifth connecting hole 401 and the sixth connecting hole 102 are used for the third screw 110 to pass through and connect to realize a detachable connection between the rear end cover 40 and the housing 10.

[0038] For the above-mentioned stator 501 and rotor magnetic ring 502, as Figure 1 As shown, the stator 501 is arranged in the accommodating cavity 10a, the stator 501 and the housing 10 are relatively fixed, the rotor magnetic ring 502 is sleeved on the rotating shaft 20, the rotor magnetic ring 502 is located between the front cover 30 and the rear cover 40, the rotor magnetic ring 502 is sleeved in the stator 501, a preset gap is spaced between the rotor magnetic ring 502 and the stator 501, and the rotor magnetic ring 502 can drive the rotating shaft 20 to rotate. Among them, the stator 501 generates a magnetic field, and the conductor in the rotor magnetic ring 502 induces this magnetic field to generate current, and the current generates a magnetic field in the rotor magnetic ring 502. The magnetic field in the rotor magnetic ring 502 interacts with the magnetic field of the stator 501, so that the rotor magnetic ring 502 starts to rotate, and then the rotating rotor magnetic ring 502 drives the rotating shaft 20 to rotate, and the other end of the rotating shaft 20 can be connected to other devices externally, so as to achieve the movement of other external devices. It is understandable that the size of the gap between the stator 501 and the rotor magnetic ring 502 is not specifically limited in the present application.

[0039] For the above-mentioned rotating shaft 20 and limiting plate 60, as Figure 1 , Figure 3 as well as Figure 4As shown, the rotating shaft is arranged in the accommodating cavity 10a, and the rotating shaft 20 is sleeved by the rotor magnetic ring 502. The rotating shaft includes a mounting portion 201 and connecting portions 202 respectively connected to the front and rear ends of the mounting portion 201. One connecting portion 202 is rotatably connected to the front end cover 30, and the other connecting portion 202 is rotatably connected to the rear end cover 40. The mounting portion 201 is used to sleeve the rotor magnetic ring 502. The outer periphery of one end of the mounting portion 201 is provided with a flange 20a for cooperating with the front end surface of the rotor magnetic ring 502 to limit the position. The limiting plate 60 is detachably connected to the other end of the mounting portion 201, and the limiting plate 60 is used to cooperate with the flange 20a to clamp and fix the rotor magnetic ring 502 on the mounting portion 201. The flange 20a on the mounting portion 201 and the limiting plate 60 are used to achieve relative fixation between the rotating shaft 20 and the rotor magnetic ring 502. Optionally, the axial diameter of the mounting portion 201 is greater than the axial diameter of the connecting portion 202 , and the axial diameter of the connecting portion 202 close to the front end cover 30 is greater than the axial diameter of the connecting portion 202 close to the rear end cover 40 .

[0040] In some embodiments, along the axial direction of the rotating shaft 20, the rotor magnetic ring 502 is located between the flange 20a and the limiting plate 60, and the limiting plate 60 cooperates with the flange 20a on the rotating shaft 20 to achieve relative fixation between the rotating shaft 20 and the rotor magnetic ring 502. When the rotating shaft 20 needs to be removed from the rotor magnetic ring 502, it is only necessary to remove the limiting plate 60 from the rotating shaft 20, and the limiting plate 60 no longer abuts against the rotor magnetic ring 502. At this time, the rotating shaft 20 can be removed from the rotor magnetic ring 502.

[0041] In some embodiments, the outer periphery of the mounting portion 201 is provided with a first mounting groove 20b, the rotor magnetic ring 502 is partially mounted in the first mounting groove 20b, the first mounting groove 20b is formed by the flange 20a and the limiting plate 60, and the first mounting groove 20b can limit the relative displacement of the rotating shaft 20 and the rotor magnetic ring 502 in the axial direction. Optionally, the limiting plate 60 is a circular ring structure, and both ends of the limiting plate 60 protrude from the end surface of the mounting portion 201 along the radial direction of the rotating shaft 20, and the connecting portion 202 close to the rear end cover 40 passes through the limiting plate 60 and is connected to the rear end cover 40.

[0042] In some embodiments, the mounting portion 201 is provided with a first connection hole 2021, and the limiting plate 60 is provided with a second connection hole 601, the second connection hole 601 is arranged opposite to the first connection hole 2021, and the first connection hole 2021 and the second connection hole 601 are passed through by the first screw 90 to realize the connection of the limiting plate 60 to the rotating shaft 20. Optionally, the number of the second connection holes 601 is two, and the two second connection holes 601 are arranged on the limiting plate 60 at equal intervals along the circumference of the rotating shaft 20, and the number of the first connection holes 2021 is two, and the two first connection holes 2021 are arranged on the mounting portion 201 at equal intervals along the circumference of the rotating shaft 20, and correspondingly, the number of the first screws 90 is two, so that the connection between the limiting plate 60 and the rotating shaft 20 can be more stable and reliable.

[0043] For the first bearing 70 and the second bearing 80, as Figure 1 , Figure 2 as well as Figure 4 As shown, the first bearing 70 is sleeved on the connecting portion 202 close to the front end cover 30, and the first bearing 70 is installed in the second mounting groove 30a, the second bearing 80 is sleeved on the connecting portion 202 close to the rear end cover 40, and the second bearing 80 is installed in the third mounting groove 40a, the first bearing 70 and the second bearing 80 are coaxially arranged, the first bearing 70 and the second bearing 80 can reduce the friction of the rotating shaft 20, so that the rotation of the rotating shaft 20 is smoother.

[0044] For the first screw 90, the second screw 100 and the third screw 110, as Figure 1 , Figure 2 as well as Figure 4 As shown, one end of the first screw 90 passes through the second connecting hole 601 and is screwed into the first connecting hole 2021, one end of the second screw 100 passes through the third connecting hole 301 and is screwed into the fourth connecting hole 101, and one end of the third screw 110 passes through the fifth connecting hole 401 and is screwed into the sixth connecting hole 102.

[0045] For the above-mentioned encoder 120 and encoder cover 130, as Figure 1As shown, the encoder 120 is connected to one end of the rotating shaft 20 close to the rear end cover 40, and the encoder 120 is located on the side of the rear end cover 40 away from the accommodating cavity 10a. The encoder 120 rotates with the rotation of the rotating shaft 20. The encoder 120 is used to identify the angular displacement of the rotating shaft 20, that is, to identify the rotation angle of the rotating shaft 20. The encoder outer cover 130 is covered on the encoder 120, and the encoder outer cover 130 is detachably connected to the rear end cover 40. The encoder outer cover 130 can prevent the encoder 120 from being directly exposed to the outside air, and plays a role of shielding and protecting the encoder 120, thereby preventing the encoder 120 from being damaged.

[0046] In the embodiment of the utility model, a housing 10, a front cover 30, a rear cover 40, a rotating shaft 20 and a limiting plate 60 are provided. The housing 10 is provided with a housing chamber 10a, and the housing chamber 10a is used to insert the stator 501. The front cover 30 is provided to cover the front opening of the housing chamber 10a, and the front cover 30 is connected to the housing 10. The rear cover 40 is provided to cover the rear opening of the housing chamber 10a, and the rear cover 40 is connected to the housing 10. The rotating shaft 20 is provided in the circular ring of the stator 501. The rotating shaft 20 includes a mounting portion 201 and connecting portions 202 respectively connected to the front and rear ends of the mounting portion 201. One of the connecting portions 202 is rotatably connected to the front cover 30, and the other of the connecting portions 202 is rotatably connected to the rear cover 40. The mounting portion 201 is used to sleeve the rotor magnetic ring 502. One of the mounting portions 201 is provided to cover the rotor magnetic ring 502. A flange 20a is provided on the outer periphery of the end for cooperating with the front end face of the rotor magnetic ring 502 to limit the position. The limiting plate 60 is detachably connected to the other end of the mounting portion 201. The limiting plate 60 is used to cooperate with the flange 20a to clamp and fix the rotor magnetic ring 502. When the stator 501 and the rotor magnetic ring 502 on the frameless motor are subjected to tooling testing, the flange 20a and the limiting plate 60 are used to cooperate to limit and fix the front and rear ends of the rotor magnetic ring 502. After the tooling test is completed, the limiting plate 60 is removed from the rotating shaft 20. At this time, the stator 501 and the rotor magnetic ring 502 on the frameless motor can be removed from the test tooling without causing damage to the frameless motor and the test tooling, thereby making the test tooling reusable. The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A frameless motor testing tool, the frameless motor comprising a rotor magnetic ring, characterized in that: include: A rotating shaft, the rotating shaft comprising a mounting portion, the mounting portion being used to sleeve the rotor magnetic ring, and a flange for cooperating with a front end surface of the rotor magnetic ring and limiting the position of the mounting portion is provided on an outer periphery of one end of the mounting portion; and A limiting plate is detachably connected to the other end of the mounting portion, and the limiting plate is used to cooperate with the flange to clamp and fix the rotor magnetic ring on the mounting portion.

2. The frameless motor testing tool according to claim 1, characterized in that: The frameless motor includes a stator, and the test fixture also includes: The housing is provided with a receiving cavity, wherein the receiving cavity is used to insert the stator; A front end cover, which is arranged on the front end opening of the accommodating cavity, and the front end cover is connected to the housing; A rear end cover, which is arranged to cover the rear end opening of the accommodating cavity, and the rear end cover is connected to the housing; Wherein, the rotating shaft is arranged in the circular ring of the stator, and the rotating shaft includes connecting parts respectively connected to the front and rear ends of the mounting part, one connecting part is rotatably connected to the front end cover, and the other connecting part is rotatably connected to the rear end cover.

3. The frameless motor testing tool according to claim 2, characterized in that: At least two limiting holes are arranged at intervals in the circumferential direction on the side wall of the housing, the limiting holes are communicated with the accommodating cavity, a fastener is arranged in the limiting hole correspondingly, one end of the fastener extends into the accommodating cavity and is used to abut against the outer peripheral wall of the stator.

4. The frameless motor testing tool according to claim 3, characterized in that: The limiting hole is a threaded hole, and the fastener is a top screw.

5. The frameless motor testing tool according to claim 3, characterized in that: The number of the limiting holes is two, and the two limiting holes are circumferentially evenly spaced on the outer circumference of the housing.

6. The frameless motor testing tool according to any one of claims 1 to 5, characterized in that: The mounting portion is provided with a first connecting hole; The limiting plate is provided with a second connection hole, and the second connection hole corresponds to the position of the first connection hole; The frameless motor testing tool further includes a first screw, one end of which passes through the second connecting hole and is screwed into the first connecting hole.

7. The frameless motor testing tool according to claim 6, characterized in that: The number of the second connection holes is two, and the two second connection holes are arranged on the limiting plate at equal intervals along the circumference of the rotating shaft; The number of the first connection holes is two, and the two first connection holes are arranged on the mounting portion at equal intervals along the circumference of the rotating shaft.

8. The frameless motor testing tool according to any one of claims 2 to 5, characterized in that: The limiting plate is a circular ring structure, and the limiting plate radially protrudes from the end surface of the mounting portion. The connecting portion close to the rear end cover passes through the limiting plate and is connected to the rear end cover.

9. The frameless motor testing tool according to claim 2, characterized in that: A second mounting groove is provided on one side of the front end cover close to the accommodating cavity, and the second mounting groove is communicated with the accommodating cavity; A third mounting groove is provided on one side of the rear end cover close to the accommodating cavity, and the third mounting groove is communicated with the accommodating cavity; The frameless motor testing tool includes a first bearing and a second bearing, the first bearing is sleeved on the connecting portion close to the front end cover, and the first bearing is installed in the second mounting groove, the second bearing is sleeved on the connecting portion close to the rear end cover, and the second bearing is installed in the third mounting groove, and the first bearing and the second bearing are coaxially arranged.

10. The frameless motor testing tool according to claim 2, characterized in that: The shaft diameter of the mounting portion is larger than the shaft diameter of the connecting portion, and the shaft diameter of the connecting portion close to the front end cover is larger than the shaft diameter of the connecting portion close to the rear end cover.

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