TW202411675A - Stator test fixture and stator testing system - Google Patents

Abstract

The invention discloses a stator testing fixture and a stator testing system. The stator testing system includes a stator testing fixture. The stator testing fixture includes a fixed member, a mandrel assembly and a holding member. The fixed member includes a bottom portion and a middle portion. The middle portion is arranged on one side of the bottom. The middle portion and the bottom portion together form an annular accommodating space. The annular accommodating space is used for accommodating the to-be-tested stator. The mandrel assembly includes a shaft body and a plurality of magnets. The plurality of magnets is arranged on the periphery of the shaft body. A mandrel assembly is rotatably arranged in the middle portion. The holding member is used for holding the outer periphery of the to-be-tested stator. When the to-be-tested stator is arranged on the fixed member, the mandrel assembly is connected to the power source, the to-be-tested stator can be connected to a phase sequence detection device to detect the phase sequence.

Description

Stator test fixture and stator inspection system

The present invention relates to a testing fixture and a detection system, in particular to a stator testing fixture and a stator detection system.

Generally speaking, after the stator of the motor has completed the winding of the coil, the phase sequence of the stator must be detected by a phase sequence detection device. If the stator passes the phase sequence detection, it will be assembled into a motor together with the rotor and other components. In the prior art, there is no device that can be used to assist relevant personnel in performing phase sequence detection on the stator. Therefore, when testing a large number of stators, a lot of manpower must be consumed.

The present invention discloses a stator test fixture and a stator detection system, which are mainly used to improve the inconvenience caused by the lack of any device to assist relevant personnel in performing phase sequence detection on the stator in the prior art.

One embodiment of the present invention discloses a stator test fixture, which is used to provide a stator to be tested for placement. The stator test fixture includes: a fixed seat, a central shaft assembly and a retaining member. The fixed seat is made of non-magnetic material, and includes a bottom and a middle portion. The middle portion is arranged on one side of the bottom, and the bottom and the middle portion form an annular accommodating space. The end of the middle portion opposite to the bottom is concave to form a receiving groove; the stator to be tested can be sleeved in the middle portion, and the stator to be tested can be arranged in the annular receiving space; the central shaft assembly includes: a shaft and a plurality of magnets. The shaft is detachably arranged on the fixed seat, and a portion of the shaft is located in the receiving groove, and one end of the shaft can be connected to a power source. A plurality of magnets are fixedly arranged on the outer periphery of the shaft. The holding member is used to hold the outer periphery of the stator to be tested; when the stator to be tested is sleeved in the middle part, and the spindle assembly is connected to the power source, and the spindle assembly rotates in the receiving groove, the stator to be tested can be connected to a phase sequence detection device to perform phase sequence detection.

One embodiment of the present invention discloses a stator detection system, which is used to perform a phase sequence detection on a stator to be tested. The stator detection system includes: a power source, a phase sequence detection device and a stator test fixture. The stator test fixture includes: a fixed seat, a central shaft assembly and a retaining member. The fixed seat is made of non-magnetic material, and the fixed seat includes a bottom and a middle portion. The middle portion is arranged on one side of the bottom, and the bottom and the middle portion form an annular accommodating space. The end of the middle portion opposite to the bottom is concave to form a accommodating groove; the stator to be tested can be sleeved in the middle portion, and the stator to be tested can be arranged in the annular accommodating space; the central shaft assembly includes: a shaft and a plurality of magnets. The shaft is detachably arranged on the fixing seat, and a part of the shaft is located in the receiving groove, and one end of the shaft can be connected to a power source; a plurality of magnets are fixedly arranged on the outer periphery of the shaft; and the holding member is used to hold the outer periphery of the stator to be tested; wherein, when the stator to be tested is sleeved in the middle part, and the mandrel assembly is connected to the power source, and the mandrel assembly rotates in the receiving groove, the stator to be tested can be connected to a phase sequence detection device to perform phase sequence detection.

In summary, the stator test fixture and stator detection system of the present invention can allow relevant personnel to conveniently perform phase sequence detection on the stator to be tested.

To further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, such description and drawings are only used to illustrate the present invention and do not limit the protection scope of the present invention.

In the following description, if it is indicated to refer to a specific figure or as shown in a specific figure, it is only used to emphasize that most of the relevant content described in the subsequent description appears in the specific figure, but it does not limit the subsequent description to only refer to the specific figure.

Please refer to Figures 1 to 4 together. Figure 1 is a block diagram of the stator detection system of the present invention. Figure 2 is a schematic diagram of the stator test fixture of the present invention set up with the stator to be tested from another angle. Figure 3 is a partial cross-section of the fixing seat of the stator test fixture of the present invention and an exploded schematic diagram of the spindle assembly. Figure 4 is a partial exploded schematic diagram of the spindle assembly of the stator test fixture of the present invention.

The stator detection system 100 of the present invention comprises: a power source 1, a phase sequence detection device 2 and a stator test fixture 3. The power source 1 comprises, for example, an electric rotating component such as a motor. For example, the power source can be an electric drill or a similar tool, but is not limited thereto. The phase sequence detection device 2 is mainly used to detect whether the phase sequence of the stator (i.e., the stator A to be tested referred to in this embodiment) wound with a coil is the same as the original design. The phase sequence detection device 2 is the same as the existing common motor phase sequence detector/instrument, and will not be described in detail here.

The stator test fixture 3 of the present invention mainly comprises a fixed seat 31, a spindle assembly 32 and a holding member 33. The fixed seat 31 is used to carry the stator A to be tested. The spindle assembly 32 is rotatably connected to the fixed seat 31. The holding member 33 is used to hold the stator A to be tested disposed on the fixed seat 31. The spindle assembly 32 is used to be connected to the power source 1, and the power source 1 can drive the spindle assembly 32 to operate so that the spindle assembly 32 rotates relative to the fixed seat 31.

When the stator A to be tested is set on the fixing seat 31, and the holding member 33 holds the stator A to be tested, and the spindle assembly 32 is connected to the power source 1, and the multiple detection lines of the phase sequence detection device 2 are connected to the test terminals of the stator A to be tested, the user can use the power source 1 to make the spindle assembly 32 rotate forward or reverse, and judge whether the phase sequence of the stator A to be tested is consistent with the original design by observing the phase sequence detection device 2.

Please refer to Figures 4 to 5 together, Figure 5 is a schematic diagram of an exploded view of a part of the stator test fixture of the present invention and a stator to be tested, Figure 6 is another schematic diagram of an exploded view of a part of the stator test fixture of the present invention and a stator to be tested, Figure 7 is a schematic diagram of a cross-section of the stator test fixture of the present invention with a stator to be tested, and Figure 8 is a schematic diagram of another embodiment of the stator test fixture of the present invention with a stator to be tested.

The fixing base 31 is made of a non-magnetic material, and includes a bottom 311 and a middle portion 312. The middle portion 312 is disposed on one side of the bottom 311. The middle portion 312 may be, for example, a substantially cylindrical structure, and the bottom 311 may be a substantially pie-shaped structure, and the outer diameter of the middle portion 312 is smaller than the outer diameter of the bottom 311, and the bottom 311 and the middle portion 312 together form an annular accommodation space 313. The middle portion 312 is used to provide a sleeve for the stator A to be measured. When the stator A to be measured is sleeved in the middle portion 312, the stator A to be measured will be located in the annular accommodation space 313, and the stator A to be measured will be carried by the bottom 311. The size and shape of the bottom portion 311 and the middle portion 312 can be designed according to the shape and size of the stator A to be measured. The figure shows only one exemplary embodiment.

The middle portion 312 has an end opposite to the bottom portion 311 and is concavely formed with a groove 3121, and the end of the middle portion 312 with the groove 3121 has an opening 3122. A portion of the spindle assembly 32 can be disposed in the groove 3121 of the middle portion 312 through the opening 3122. The size and shape of the middle portion 312 and the shape and size of the groove 3121 are not limited to those shown in the figure.

The spindle assembly 32 includes: a shaft 321, a fixing member 33, a plurality of magnets 322, and two bearings. The shaft 321 is detachably disposed on the fixing seat 31, and a portion of the shaft 321 is located in the receiving groove 3121, and one end of the shaft 321 is used to connect with the power source 1. The shaft 321 can be, for example, a cylindrical structure, but is not limited thereto. In practical applications, the power source 1 can be, for example, an electric drill, and the shaft 321 can be connected to the electric drill through a plurality of screws and other related locking members, so that the shaft 321 can rotate relative to the fixing seat 31 along with the electric drill.

A plurality of magnets 322 are fixedly disposed on the outer periphery of the shaft 321. The number of magnets 322 included in the spindle assembly 32 and the spacing between the plurality of magnets 322 can be designed according to the stator A to be tested. The figure shows only one exemplary embodiment. In practical applications, each magnet 322 can be a permanent magnet.

The two opposite ends of the shaft 321 are defined as an outer end 321A and an inner end 321B. The two bearings are defined as an outer bearing 323 and an inner bearing 324. The inner ring structure 3231 of the outer bearing 323 is fixed to the shaft 321, and the outer bearing 323 is disposed adjacent to the outer end 321A of the shaft 321. The inner ring structure 3241 of the inner bearing 324 is fixed to the shaft 321, and the inner bearing 324 is disposed adjacent to the inner end 321B of the shaft 321. The outer ring structure 3232 of the outer bearing 323 and the outer ring structure 3242 of the inner bearing 324 are used to engage with the side wall forming the receiving groove 3121, and the shaft 321 can rotate relative to the fixing base 31 through the two bearings.

As described above, a plurality of magnets 322 are disposed on the outer periphery of the shaft 321, and an outer bearing 323 and an inner bearing 324 are disposed at both ends of the shaft 321. The plurality of magnets 322, the outer bearing 323 and the inner bearing 324 can be inserted into the receiving groove 3121 of the middle part 312 through the opening 3122 of the middle part 312 to be assembled in the middle part 312. The outer bearing 323 is disposed adjacent to the opening 3122, and the inner bearing 324 is disposed away from the opening 3122.

As shown in FIG. 1 , FIG. 2 and FIG. 3 , the holding member 33 is used to hold the periphery of the stator A to be tested. Specifically, the holding member 33 may include two arc-shaped members 331 and two locking members 332. The two arc-shaped members 331 and the two locking members 332 can cooperate with each other to surround the periphery of the stator A to be tested, thereby holding the stator A to be tested. The number of arc-shaped members 331 and locking members 332 included in the holding member 33 is not limited to that shown in the figure.

When the relevant personnel install the spindle assembly 32 on the fixing seat 31, and make the stator A to be tested be sleeved in the middle part 312, and make the stator A to be tested lean on the bottom 311, the relevant personnel will be able to operate the two arc-shaped components 331 and the two locking pieces 332, so that the two arc-shaped components 331 and the two locking pieces 332 jointly hold the outer periphery of the stator A to be tested, so that the stator A to be tested is stably set on the fixing seat 31.

It should be noted that in different embodiments, the holding member 33 may include only a single locking member 332, and one end of the two arc-shaped members 331 may be mutually hinged, and the other end of the two arc-shaped members 331 may be mutually fixed by the locking member 332. Of course, the specific form of the holding member 33 is not limited to the above description, and any form of the holding member 33 that can be used to hold the outer periphery of the stator A to be measured disposed on the fixing seat 31 should fall within the variable scope of the holding member 33 of the present invention.

According to the above, please refer to Figures 1, 2 and 5 to 7. The relevant personnel will put the stator A to be tested on the middle part 312, and connect the relevant terminals of the stator A to be tested to the phase sequence detection device 2, and connect the spindle assembly 32 to the power source 1. Then, the relevant personnel can start the power source 1 to make the spindle assembly 32 rotate in the groove 3121, and then use the relevant information (such as light signals of different colors) presented by the phase sequence detection device 2 to determine whether the current phase sequence of the stator A to be tested is the same as the originally designed phase sequence.

As shown in FIG. 3 and FIG. 7 , in one preferred embodiment, the receiving groove 3121 is divided into a first bearing groove 3121A, a middle groove 3121B and a second bearing groove 3121C, the middle groove 3121B is located between the first bearing groove 3121A and the second bearing groove 3121C, the second bearing groove 3121C is disposed adjacent to the bottom 311, and the first bearing groove 3121A is disposed away from the bottom 311. The side wall of the first bearing groove 3121A is formed to engage with the outer ring structure 3232 of the outer bearing 323. The middle groove 3121B is used to accommodate the section of the shaft 321 provided with multiple magnets 322, and there is a gap between each magnet 322 and the side wall forming the middle groove 3121B. The side wall forming the second bearing groove 3121C is used to engage with the outer ring structure 3242 of the inner bearing 324.

The outer diameter of the outer bearing 323 is defined as a first outer diameter D1, the outer diameter of the shaft 321 provided with a plurality of magnets 322 is defined as a second outer diameter D2, and the outer diameter of the inner bearing 324 is defined as a third outer diameter D3. The first outer diameter D1 is greater than the second outer diameter D2, and the second outer diameter D2 is greater than the third outer diameter D3. In addition, the bottom 311 may further include an operating hole 3111, the inner diameter D4 of the operating hole 3111 is smaller than the third outer diameter D3, and a portion of the inner bearing 324 is exposed through the operating hole 3111.

Through the above design, the relevant personnel can insert the relevant tools into the operation hole 3111 according to the needs to push the inner bearing 324 and simultaneously pull the spindle assembly 32, so that the spindle assembly 32 can pass through the opening 3122 of the groove 3121 and leave the fixing seat 31. On the contrary, the relevant personnel can easily pass the spindle assembly 32 through the opening 3122 and install it in the middle part 312.

In practice, relevant personnel may need to test a large number of stators A to be tested. In this case, relevant personnel can prepare multiple fixing seats 31, and first place multiple stators A to be tested on multiple fixing seats 31 respectively, and connect each stator A to be tested to the phase sequence detection device 2. Then, relevant personnel only need to connect a spindle assembly 32 to the electric drill (i.e., power source 1), that is, the spindle assembly 32 can be used to connect to multiple fixing seats 31 in sequence, so as to quickly perform phase sequence detection on multiple stators A to be tested.

That is to say, when the relevant personnel want to test multiple stators A to be tested, there is no need to prepare multiple power sources 1. Instead, the relevant personnel can only use a single power source 1 and a single spindle assembly 32 to assemble and disassemble multiple fixing seats 31, so as to quickly and conveniently perform phase sequence testing on the stators A to be tested set on the multiple fixing seats 31.

As shown in FIG. 7 , it is worth mentioning that in one preferred embodiment, the gap H between each magnet 322 and the outer wall of the middle portion 312 is not greater than 3 mm, and the magnetic force of the plurality of magnets 322 can attract the stator A to be tested that is sleeved on the middle portion 312, so that the plurality of coil assemblies A1 that are engaged with each other included in the stator A to be tested can be uprightly arranged on the bottom 311 of the fixing seat 31. Preferably, the gap H is not greater than 2.4 mm.

As described above, by making the plurality of magnets 322 included in the spindle assembly 32 attract the stator A to be tested which is sleeved in the middle portion 312, the stator A to be tested can still be placed upright on the bottom 311 when not being held by the holding member 33, and the user can conveniently hold the holding member 33 around the stator A to be tested.

That is, when the stator A to be measured is sleeved in the middle part 312, the multiple coil groups A1 of the stator A to be measured will be attracted by the multiple magnets 322 of the spindle assembly 32 and roughly against the outer periphery of the middle part 312. At this time, the relevant personnel can easily fix the outer periphery of the stator A to be measured with the holding member 33. In contrast, if the multiple magnets 322 do not attract the multiple coil groups A1 of the stator A to be measured when the stator A to be measured is sleeved in the middle part 312, the multiple coil groups A1 that are engaged with each other may be skewed or tilted to one side. Therefore, it is relatively difficult for the relevant personnel to fix the holding member 33 to the outer periphery of the stator A to be measured.

As described above, the stator detection system 100 and the stator test fixture 3 of the present invention can allow relevant personnel to conveniently and quickly perform phase sequence detection on the stator A to be tested.

Please refer to FIG8, which is a schematic diagram showing another embodiment of the stator test fixture of the present invention being provided with a stator to be tested. The stator test fixture of this embodiment is different from the aforementioned embodiment in that the end of the shaft 321 of the spindle assembly 32 for connecting to the power source 1 also has an operating structure 325. The operating structure 325 is provided for the user to hold and manually drive the spindle assembly 32 to rotate. For example, the end of the shaft 321 for connecting to the power source 1 may have a through hole 3211, and the operating structure 325 may be a rod-shaped member, and the rod-shaped member can be inserted into the through hole 3211.

In the example where the operating structure 325 is a rod-shaped member, before placing the stator A to be measured on the fixing seat 31, the relevant personnel may first remove the rod-shaped member (i.e., the operating structure 325) so that the stator A to be measured can be smoothly placed on the fixing seat 31, and then the rod-shaped member (i.e., the operating structure 325) is inserted into the through hole 3211 of the shaft 321. Of course, in different embodiments, the operating structure 325 and the shaft 321 may also be integrally formed, and the width of the operating structure 325 will not affect the stator A to be measured being sleeved in the middle portion 312.

Please refer to Figures 9 and 10 together, which show another embodiment of the stator test fixture of the present invention and a schematic diagram of the disassembly and assembly of the stator to be tested. The stator test fixture of this embodiment is different from the aforementioned embodiment in that the retaining member 33A is an annular structure extending from the bottom 311 of the fixing seat 31 to the side where the middle portion 312 is provided. The annular structure is also used to retain a portion of the periphery of the stator A to be tested located in the annular accommodating space 313. In other words, when the relevant personnel put the stator A to be tested on the middle portion 312 and make the stator A to be tested bear on the bottom 311, the retaining member 33A, which is a ring-shaped structure, will be directly located on the periphery of the stator A to be tested to retain the stator A to be tested. The annular retaining member 33A and the bottom 311 still together form an annular accommodating space 313 , and the stator A to be measured is correspondingly disposed in the annular accommodating space 313 .

In summary, the stator test fixture and stator detection system of the present invention enable relevant personnel to conveniently, quickly and simply perform phase sequence detection on a large number of stators to be tested, and the overall manufacturing cost of the stator test fixture is low.

The above description is only the preferred feasible embodiment of the present invention, and does not limit the patent scope of the present invention. Therefore, all equivalent technical changes made by using the contents of the specification and drawings of the present invention are included in the protection scope of the present invention.

100: stator detection system 1: power source 2: phase sequence detection device 3: stator test fixture 31: fixed seat 311: bottom 3111: operation hole 312: middle part 3121: receiving groove 3121A: first bearing groove 3121B: middle groove 3121C: second bearing groove 3122: opening 313: annular receiving space 32: spindle assembly 321: shaft 321A: outer end 321B: inner end 3211: through hole 322: magnet 323: outer bearing 3231: inner ring structure 3232: outer ring structure 324: inner bearing 3241: Inner ring structure 3242: Outer ring structure 325: Operating structure 33: Holding member 331: Arc member 332: Locking member 33A: Holding member A: Stator to be measured A1: Coil assembly H: Gap D1: First outer diameter D2: Second outer diameter D3: Third outer diameter D4: Inner diameter

FIG1 is a block diagram of a stator detection system of the present invention.

FIG. 2 is a schematic diagram showing another perspective of the stator test fixture of the present invention being set up with the stator to be tested.

FIG3 is a partial cross-section of the fixing base of the stator test fixture of the present invention and an exploded schematic diagram of the spindle assembly.

FIG. 4 is a partially exploded schematic diagram of the spindle assembly of the stator test fixture of the present invention.

FIG. 5 is an exploded schematic diagram of a portion of the stator test fixture of the present invention and the stator to be tested.

FIG. 6 is another exploded schematic diagram of a part of the stator test fixture of the present invention and the stator to be tested.

FIG. 7 is a cross-sectional schematic diagram of a stator test fixture of the present invention being set up with a stator to be tested.

FIG8 is a schematic diagram of another embodiment of the stator test fixture of the present invention, in which a stator to be tested is arranged.

FIG. 9 and FIG. 10 are respectively another embodiment of the stator test fixture of the present invention and a schematic diagram of the disassembly and assembly of the stator to be tested.

100: Stator detection system

1: Power source

2: Phase sequence detection device

3: Stator test fixture

31: Fixed seat

311: Bottom

312: Middle part

32: Spindle assembly

321: Axis

323: Outer bearing

33: Holding component

331: Arc-shaped component

332: Lock firmware

A: Stator to be tested

Claims (14)

A stator test fixture is used to place a stator to be tested, and the stator test fixture includes: A fixed seat, which is made of non-magnetic material, the fixed seat includes a bottom and a middle part, the middle part is arranged on one side of the bottom, the bottom and the middle part form an annular accommodating space, and the middle part is concave at one end opposite to the bottom to form a accommodating groove; the stator to be tested can be sleeved in the middle part, and the stator to be tested can be arranged in the annular accommodating space; A spindle assembly, which includes: A shaft, which is detachably arranged on the fixed seat, and a part of the shaft is located in the accommodating groove, and one end of the shaft can be connected to a power source; A plurality of magnets, which are fixedly arranged on the outer periphery of the shaft; A holding member, which is used to hold the outer periphery of the stator to be tested; Wherein, when the stator to be tested is sleeved in the middle part, and the spindle assembly is connected to the power source, and the spindle assembly rotates in the groove, the stator to be tested can be connected to a phase sequence detection device to detect the phase sequence. A stator test fixture as described in claim 1, wherein the spindle assembly includes two bearings, the inner ring structure of each bearing is fixed to the shaft, and the outer ring structure of each bearing is used to engage with the side wall forming the groove, and the spindle assembly provided with two bearings and a plurality of magnets can be placed in the groove of the middle portion through an opening of the middle portion. A stator test fixture as described in claim 2, wherein the two bearings are respectively an outer bearing and an inner bearing, the outer bearing is arranged adjacent to the opening, and the inner bearing is arranged away from the opening; the outer diameter of the outer bearing is defined as a first outer diameter, the outer diameter of the shaft provided with a plurality of the magnets is defined as a second outer diameter, the outer diameter of the inner bearing is defined as a third outer diameter, the first outer diameter is larger than the second outer diameter, the second outer diameter is larger than the third outer diameter, and the bottom further includes an operating hole, the inner diameter of the operating hole is smaller than the third outer diameter, and a portion of the inner bearing is exposed through the operating hole. A stator test fixture as described in claim 1, wherein the retaining member includes at least two arc-shaped members and at least two locking members, and the two arc-shaped members and the two locking members can cooperate with each other to be disposed around the periphery of the stator to be tested to retain the stator to be tested. A stator test fixture as described in claim 1, wherein the retaining member is an annular structure extending from the bottom to a side where the middle portion is provided. A stator test fixture as described in claim 1, wherein one end of the shaft for connecting to the power source also has at least one operating structure, and the operating structure is used to provide a user with a grip to manually drive the spindle assembly to rotate. A stator test fixture as described in claim 1, wherein the gap between each of the magnets and the outer wall of the middle portion is no more than 3 mm, and the magnetic force of the plurality of magnets can attract the stator to be tested that is sleeved on the middle portion, so that the plurality of coil groups that are engaged with each other included in the stator to be tested can be upright on the bottom. A stator detection system is used to perform a phase sequence detection on a stator to be tested, and the stator detection system includes: A power source; A phase sequence detection device; A stator test fixture, which includes: A fixed seat, which is made of non-magnetic material, the fixed seat includes a bottom and a middle part, the middle part is arranged on one side of the bottom, the bottom and the middle part form an annular accommodating space, and the middle part is concave at one end opposite to the bottom to form a accommodating groove; the stator to be tested can be sleeved in the middle part, and the stator to be tested can be arranged in the annular accommodating space; A spindle assembly, which includes: A shaft, which is detachably arranged on the fixed seat, and a part of the shaft is located in the accommodating groove, and one end of the shaft can be connected to a power source; A plurality of magnets fixedly disposed on the outer periphery of the shaft; A holding member used to hold the outer periphery of the stator to be tested; Wherein, when the stator to be tested is sleeved in the middle portion, and the spindle assembly is connected to the power source, and the spindle assembly rotates in the receiving slot, the stator to be tested can be connected to a phase sequence detection device to perform phase sequence detection. A stator detection system as described in claim 8, wherein the central shaft assembly includes two bearings, the inner ring structure of each bearing is fixed to the shaft body, and the outer ring structure of each bearing is used to engage with the side wall forming the groove, and the central shaft assembly provided with two bearings and multiple magnets can be inserted into the middle part through an opening in the middle part. A stator detection system as described in claim 9, wherein the two bearings are respectively an outer bearing and an inner bearing, the outer bearing is arranged close to the opening, and the inner bearing is arranged away from the opening; the outer diameter of the outer bearing is defined as a first outer diameter, the outer diameter of the plurality of magnets arranged on the shaft is defined as a second outer diameter, and the outer diameter of the inner bearing is defined as a third outer diameter, the first outer diameter is larger than the second outer diameter, and the second outer diameter is larger than the third outer diameter. A stator detection system as described in claim 8, wherein the retaining member includes at least two arc-shaped members and at least two locking members, and the two arc-shaped members and the two locking members can cooperate with each other to be disposed around the periphery of the stator to be tested to retain the stator to be tested. A stator detection system as described in claim 8, wherein the retaining member is an annular structure extending from the bottom to a side where the middle portion is provided. A stator detection system as described in claim 8, wherein one end of the shaft for connecting to the power source also has at least one operating structure, and the operating structure is used to provide a user with a grip to manually drive the spindle assembly to rotate. A stator detection system as described in claim 8, wherein the gap between each of the magnets and the outer wall of the middle portion is no more than 3 mm, and the magnetic force of the multiple magnets can attract the stator to be tested that is sleeved on the middle portion, so that the multiple coil groups that are engaged with each other included in the stator to be tested can be upright on the bottom.