Motor stator coil inserting tool and coil inserting method

Abstract

The invention relates to an off-line auxiliary tool, in particular to a motor stator off-line tool and an off-line method, and aims to solve the technical problems of low efficiency, low qualification rate and relatively high requirement on the skill level of an operator in the prior art. The tool comprises a winding tool for winding wires into windings, and a stator core fixing tool for sleeving a plurality of windings on a stator core according to a preset mode; the winding tool comprises a center shaft, a limiting circular ring with one side connected with one end of the center shaft, a handle connected with the other side of the limiting circular ring, a plurality of continuous winding blocks and a cushion block which are sequentially arranged on the center shaft in a sleeving mode, and a nut detachably installed at the other end of the center shaft. The stator core fixing tool comprises a supporting base, a mounting platform, a mounting frame and two fixing plates. According to the tool, the consistency of the winding and the stator core is ensured. According to the method, the winding efficiency of the motor is effectively improved, and the method has wide application value.

Description

Technical Field

[0001] This invention relates to an auxiliary tooling for unloading motor stators, specifically to a tooling and method for unloading motor stators. Background Technology

[0002] Inertial elements are instruments used to measure physical quantities such as the velocity, acceleration, position, and attitude of a moving object in inertial space. Typically, a gyroscope is responsible for measuring the angular motion of a moving object, while a torque motor is responsible for stabilizing and controlling the attitude of a platform. The inertial measurement unit (IMU) thus formed has wide applications in fields such as navigation, aerospace, aviation, oil exploration, mining, and marine development. Inertial technology has permeated all aspects of social life.

[0003] Among the many components of a gyroscope, the motor is an extremely important element and the core of the gyroscope. It is the motor that generates a constant angular momentum, enabling the gyroscope to exhibit the gyroscopic effect. The motor is a crucial component that provides the gyroscope with the necessary angular momentum and enables it to achieve the basic characteristics of a gyroscope (gyroscopic effect). The magnitude of the angular momentum and its performance stability are directly related to the accuracy, reliability, and lifespan of the gyroscope. Therefore, the motor is often referred to as the heart of the gyroscope.

[0004] Torque motors provide accurate navigation references on inertial platforms, counteract interference torques, precisely control the platform's minute rotations, drive the platform to adjust to the correct attitude, reduce mechanical transmission errors and wear, and improve the system's reliability and stability. Therefore, torque motors are the core actuators for inertial platforms to achieve high-precision and high-stability navigation functions, ensuring the accuracy and reliability of inertial navigation systems in fields such as aviation and aerospace.

[0005] The stator assembly is a crucial component and structural foundation of various motors (such as three-phase motors). It is the stationary part of the motor, consisting of the stator core, windings, and frame. The stator assembly provides fixed support for the motor and is the core component for generating the magnetic field. Furthermore, it is a key component for the motor's functionality, closely related to its performance, efficiency, and reliability. The stator assembly generates a magnetic field by energizing the windings, which interacts with the rotor assembly to convert electrical energy into mechanical energy. Therefore, a reasonable winding layout can optimize the magnetic field distribution and improve motor performance. See the schematic diagram of an existing stator core. Figure 12 It includes an annular yoke 33 and a plurality of protruding teeth 32 disposed on the inner ring of the yoke 33, with a tooth groove 31 formed between two adjacent teeth 32.

[0006] Currently, there are many models and types of motors produced. Based on different operating methods, motor stators are mainly divided into external stator structures and internal stator structures. Based on different application scenarios, they are divided into gyroscope motor stators, torque motor stators, and various generator stators, etc. The current method for winding stator components for various motors used in inertial measurement units mainly relies on manual winding in the stator core slots. The problems with this method are: 1) low work efficiency, time-consuming and labor-intensive; 2) poor consistency of the stator core after winding, which can easily lead to excessive differences in three-phase current when the motor is installed and used; 3) high skill requirements for operators, resulting in a low pass rate. Summary of the Invention

[0007] The purpose of this invention is to solve the existing technical problems of low efficiency, insufficient pass rate, and high skill requirements for operators, and to provide a tooling and method for removing motor stators from the production line.

[0008] To achieve the above objectives, the technical solution provided by this invention is: A stator unloading fixture for an electric motor, wherein the stator core includes an annular yoke and a plurality of protruding teeth evenly distributed on the inner ring of the yoke, wherein a tooth groove is formed between every two adjacent teeth; its special feature is that: It includes a winding fixture for winding conductors into windings, and a stator core fixing fixture for mounting multiple windings onto the stator core in a preset manner. The winding fixture includes a central shaft, a limiting ring connected to one end of the central shaft on one side, a handle connected to the other side of the limiting ring, a series of winding blocks and a pad block sequentially sleeved on the central shaft, and a nut detachably installed at the other end of the central shaft; the pad block is square in shape, with a side groove in the middle of each side, a central through hole in the center of the pad block, and a square mounting groove on the bottom surface near the tail winding block. Each winding block includes a separator block and a winding block that are fixedly connected to each other, wherein the size and structure of each separator block are the same as those of the pad block; each winding block is square in shape and has a central through hole; each winding block is a square frustum-shaped block, including a large end and a small end, wherein the large end is fixedly connected to the separator block, and the small end is disposed in the mounting groove of the separator block or pad block in the next adjacent winding block; the shape of each mounting groove is adapted to the shape of the corresponding winding block; All central through holes are identical in size and relative position; each winding block is used to wind one coil unit in the winding, and the side slots are for the wires connected to the corresponding coil unit to pass through; The stator core fixing fixture includes a support base, an installation platform, an installation frame, and two fixing plates. A support column is located at the center of the upper surface of the support base, and a hollow installation column that mates with the support column is located at the corresponding position on the lower surface of the installation platform. The support column is positioned within the hollow installation column. The installation frame is vertically mounted on the installation platform, with a semi-circular groove along its upper edge. Both sides of the semi-circular groove have limiting protrusions for positioning and fixing the fixing plates. The two fixing plates are vertically and tightly attached to the semi-circular groove. Each fixing plate is annular, with a stepped hole in its center. The larger ends of the two stepped holes are located on the inner side for placing the stator core, while the smaller ends are located on the outer side for positioning the stator core.

[0009] Furthermore, the number of winding blocks is 9 to 12.

[0010] Furthermore, the angle between the square frustum-shaped side of the winding block and the central axis is 2.7°~3.3°.

[0011] Furthermore, each of the partition blocks, as well as the large and small ends of each winding block, are rounded squares; the cross-sectional shape of the central shaft and the shape of each central through hole are rounded rectangles.

[0012] Furthermore, the number of winding blocks is twelve, and the angle between the square frustum-shaped side of the winding block and the central axis is 3°.

[0013] Furthermore, each of the winding blocks and pads is clearance-fitted with the central shaft, as well as with adjacent winding blocks, with a fit accuracy of 3μm~5μm.

[0014] Furthermore, the central shaft and the support base are both made of 45# steel, each of the winding blocks and pads is made of aluminum and the surface is polished; the mounting platform, the mounting bracket and the two circular fixing plates are all made of aluminum alloy. The lower end face of the support base is provided with a circular groove.

[0015] Furthermore, the outer surface of the nut is knurled.

[0016] Meanwhile, the present invention also provides a method for removing a motor stator from the production line, which is characterized by employing the aforementioned motor stator removal fixture and including the following steps: Step 1: Place all the winding blocks one by one onto the central shaft, then place the pad block downstream of the winding block at the tail end, and install the nut to form a winding fixture. Step 2: Using a winding machine, a wire is wound from the winding block near the limiting ring end of the winding fixture to the winding block near the pad end. The wire is wound one by one. When the side of a winding block is wound as required, the wire is inserted from the nearest side slot on the separator block into the side of the next winding block. The winding continues until the preset number of coil units is reached. Step 3: Remove the nuts, remove all the winding blocks, washers, and wires on the winding blocks from the central shaft, then remove the washers and each winding block in turn, and separate the wound wires to obtain a winding. Step 4: Repeat steps 1 to 3 X times to obtain X+1 windings, where X is a positive integer. Step 5: Perform resistance tests on all obtained windings. If any winding fails the test, discard the winding and repeat Steps 1 to 3. Then perform resistance tests on all obtained windings until all X+1 windings pass the test. Step 6: Fix the support base on the workbench, then install the mounting platform on the support base, and fix the mounting bracket on the upper surface of the mounting platform; Step 7: Prepare the stator core and two fixing plates. Place the stator core in the stepped holes of the two fixing plates, and then place the assembly of the two stator cores and two fixing plates into the semi-circular groove of the mounting bracket. Step 8: Place the X+1 qualified windings onto the stator core in sequence according to the preset rules to form a stator core with windings. Perform a performance test on the stator core with windings. If it meets the preset requirements, the motor stator is completed. If it does not meet the requirements, remove all windings and return to step 1 until the performance test of the stator core with windings meets the preset requirements, and the motor stator is completed.

[0017] Further, in step 4, X=2; the three qualified windings obtained in step 5 are defined as the U-phase winding, V-phase winding, and W-phase winding, respectively. In step 7, the stator core has eighteen teeth.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. The stator unwinding fixture provided by the present invention adopts a winding fixture and a stator core fixing fixture that cooperate with each other to ensure the consistency of the winding and the stator core.

[0019] 2. The stator unloading fixture provided by this invention has broad feasibility, is easy to operate, and can effectively improve the production efficiency of motor stator assemblies; it has a simple structure, is easy to assemble and disassemble, uses widely available materials, has relatively low cost, and does not require special maintenance or upkeep.

[0020] 3. The stator unwinding method of the motor provided by the present invention effectively improves the unwinding efficiency of the motor and has wide application value. It can be applied to motor models of various inertial measurement units. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the stator core fixing fixture in an embodiment of the motor stator unloading fixture of the present invention; Figure 2 This is a three-dimensional structural diagram of the winding fixture in an embodiment of the stator unwinding fixture of the present invention. Figure 1 ; Figure 3 This is a three-dimensional structural diagram of the winding fixture in an embodiment of the stator unwinding fixture of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the assembly of the handle, limiting ring, nut and central shaft in the winding fixture of an embodiment of the stator unwinding fixture of the present invention; Figure 5 This is a schematic diagram of the winding fixture in an embodiment of the stator winding fixture of the present invention. Figure 3 (Only two winding blocks are shown; the pad blocks are not shown.) Figure 6 This is a three-dimensional structural diagram of the winding block in the winding fixture of an embodiment of the motor stator unwinding fixture of the present invention; Figure 7 This is a three-dimensional structural diagram of the pad block in the winding fixture of an embodiment of the motor stator unwinding fixture of the present invention; Figure 8 This is a schematic diagram of the support base in the stator core fixing fixture of an embodiment of the stator unloading fixture of the present invention. Figure 1 ; Figure 9 This is a schematic diagram of the support base in the stator core fixing fixture of an embodiment of the stator unloading fixture of the present invention. Figure 2 ; Figure 10 This is a schematic diagram of the mounting frame in the stator core fixing fixture of an embodiment of the motor stator unloading fixture of the present invention; Figure 11 This is a schematic diagram of the installation platform in the stator core fixing fixture of an embodiment of the motor stator unloading fixture of the present invention; Figure 12 This is a schematic diagram of the existing stator core structure; Figure 13 This is a schematic diagram of the structure of the pad block in the winding fixture of the motor stator unwinding fixture embodiment of the present invention, wherein Figure (a) is the main view, and Figures (b) and (c) are cross-sectional views in two directions, respectively; Figure 14This is a schematic diagram of the winding block in the winding fixture of the motor stator unwinding fixture embodiment of the present invention, wherein Figure (a) is the main view, and Figures (b) and (c) are cross-sectional views in two directions, respectively; Figure 15 This is a cross-sectional view of the nut in the winding fixture of an embodiment of the motor stator unwinding fixture of the present invention; Figure 16 This is a schematic diagram of the handle, limiting ring and central shaft in the winding fixture of the motor stator unwinding fixture embodiment of the present invention, wherein Figure (a) is the front view and Figure (b) is the side view; Figure 17 This is a schematic diagram of the mounting bracket in an embodiment of the motor stator unloading tooling of the present invention, wherein Figure (a) is a sectional view and Figure (b) is a top view; Figure 18 This is a schematic diagram of the structure of the fixing plate in an embodiment of the motor stator unloading tooling of the present invention, wherein Figure (a) is the front view and Figure (b) is the sectional view; Figure 19 for Figure 11 A sectional view; Figure 20 for Figure 8 A sectional view; The attached figures are labeled as follows: 1-Winding fixture, 11-Handle, 12-Limiting ring, 13-Nut, 14-Pan block, 15-Winding block, 151-Separator block, 152-Winding block, 1501-Mounting groove, 1502-Center through hole; 1503-Side groove, 16-Central shaft; 2-Stator core fixing fixture, 21-Support base, 211-Circular groove, 212-Support column, 22-Mounting platform, 221-Hollow mounting column, 23-Mounting bracket, 231-Limiting protrusion arc, 24-Fixing plate, 2401-Stepped hole; 3-Stator core, 31-Groove, 32-Groove, 33-Yoke. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] See the structural schematic diagram of the stator core 3 on the existing three-phase motor. Figure 12 It includes a circular yoke 33 and a plurality of protruding teeth 32 evenly distributed on the inner ring of the yoke 33. Each pair of adjacent teeth 32 forms a tooth groove 31, and the total number of tooth grooves 31 is eighteen.

[0024] A stator winding fixture for an electric motor includes a winding fixture 1 for winding conductors into windings (see...). Figure 2 , Figure 3 , Figure 5), and a stator core fixing fixture 2 that mounts multiple (three in this embodiment) windings onto the stator core 3 in a preset manner (see Figure 1 ); See Figure 4 , Figure 5 , Figure 16 The winding fixture includes a central shaft 16, a limiting ring 12 connected to one end of the central shaft 16, a handle 11 connected to the other side of the limiting ring 12, a series of winding blocks 15 sequentially sleeved on the central shaft 16 and a pad block 14, and a nut 13 detachably installed on the other end of the central shaft 16; the pad block 14 is square in shape, with a side groove 1503 in the middle of each side, a central through hole 1502 in the center of the pad block 14, and a square mounting groove 1501 on the bottom surface near the tail winding block 15; See Figure 6 and Figure 14 Each winding block 15 includes a separator block 151 and a winding block 152 that are fixedly connected to each other. The size and structure of each separator block 151 are the same as those of the pad block 14. Each winding block 152 is square in shape and has a central through hole 1502. Each winding block 152 is a square frustum-shaped block, including a large end and a small end. The large end is fixedly connected to the separator block 151, and the small end is located in the mounting groove 1501 of the separator block 151 or the pad block 14 in the next adjacent winding block 15. The shape of each mounting groove 1501 is adapted to the shape of the corresponding winding block 152.

[0025] All central through holes 1502 are identical in size and relative position; each winding block 152 is used to wind one coil unit in the winding, and the side slots 1503 are for the wires connected to the corresponding coil unit to pass through. Each separator block 151, and the large and small ends of each winding block 152 are rounded squares. The cross-sectional shape of the central shaft 16 and the shape of each central through hole 1502 are rounded rectangles. Each winding block 15 and spacer 14 has a clearance fit with the central shaft 16, and between adjacent winding blocks 15, with a fit accuracy of 3μm~5μm, which facilitates the assembly and disassembly of the winding blocks 15 and spacers 14 and extends their lifespan.

[0026] Stator core fixing fixture 2 includes a support base 21 (see...) Figure 8 , Figure 9 , Figure 20 ), Installation platform 22 (see Figure 11 , Figure 19 Mounting bracket 23 (see) Figure 10 ) and two fixing plates 24 (see Figure 17 , Figure 18The upper end face of the support base 21 is provided with a support column 212 in the middle, and the lower end face of the mounting platform 22 is provided with a hollow mounting column 221 that cooperates with the support column 212. The support column 212 is set inside the hollow mounting column 221. The mounting bracket 23 is vertically set on the mounting platform 22, and a semi-circular groove is provided on its upper edge. Both sides of the semi-circular groove are provided with limiting protrusions 231 for limiting and fixing the fixing plate 24. The two fixing plates 24 are vertically attached to the semi-circular groove. Each fixing plate 24 is annular and has a stepped hole 2401 with a step in the middle. The large end of the two stepped holes 2401 is located on the inner side for placing the stator core 3. The small end of the two stepped holes 2401 is located on the outer side for limiting the stator core 3.

[0027] The central shaft 16 and the support base 21 are both made of 45 steel, and each winding block 15 and pad block 14 are made of aluminum with polished surfaces. The mounting platform 22, mounting bracket 23 and two circular fixing plates 24 are all made of aluminum alloy, which together ensures the strength of the tooling and increases its reliability.

[0028] To increase the stability of the support, a circular groove 211 is provided on the lower end surface of the support base 21.

[0029] The angle between the square frustum-shaped side surface of the winding block 152 and the central axis is 3°, which is beneficial to the winding process.

[0030] See Figure 15 To facilitate disassembly and assembly, the outer surface of nut 13 is knurled.

[0031] Meanwhile, this embodiment also provides a method for removing a motor stator from the production line, which uses the above-mentioned motor stator removal tooling and includes the following steps: Step 1: Place all the winding blocks 15 one by one onto the central shaft 16, then place the pad block 14 downstream of the winding block 15 at the tail end, and install the nut 13 to form the winding fixture 1. Step 2: Using a winding machine, a wire is wound from the winding block 152 of the winding block 15 near the limiting ring 12 of the winding fixture 1 to the winding block 152 near the pad block 14. The wire is wound one by one. When the side of a winding block 152 is wound as required, the wire is entered from the nearest side slot 1503 on the separator block 151 into the side of the next winding block 152. The winding continues until the preset number of coil units is reached. Step 3: Remove the nut 13, remove all the winding blocks 15, the pads 14 and the wires on the winding blocks 15 from the central shaft 16, then remove the pads 14 and each winding block 15 in sequence, and separate the wound wires to obtain a winding. Step 4: Repeat steps 1 to 3 twice in sequence to finally obtain three windings, which are defined as U-phase winding, V-phase winding, and W-phase winding. Step 5: Perform resistance tests on all obtained windings. If any winding fails the test, discard the winding and repeat Steps 1 to 3. Then perform resistance tests on all obtained windings until all three windings pass the test. Step 6: Fix the support base 21 on the workbench, then install the mounting platform 22 on the support base 21, and fix the mounting bracket 23 on the upper surface of the mounting platform 22. Step 7: Prepare the stator core 3 and two fixing plates 24. Place the stator core 3 in the stepped holes 2401 of the two fixing plates 24, and then place the assembly of the two stator cores 3 and the two fixing plates 24 into the semi-circular groove of the mounting bracket 23. The stator core 3 and the two fixing plates 24 are fitted with a clearance, and the fit accuracy is 10~15μm. Step 8: Install the three qualified windings onto the stator core 3 in sequence according to the preset rules to form a stator core 3 with windings. Perform a performance test on the stator core 3 with windings. If it meets the preset requirements, the motor stator is completed. If it does not meet the requirements, remove all windings and return to step 1 until the performance test of the stator core 3 with windings meets the preset requirements, and the motor stator is completed.

[0032] In step 8, the preset rule is as follows: the eighteen teeth 32 are numbered sequentially as 1, 2, 3...18, where teeth 32 numbered 1-12 are defined as the first group, teeth 32 numbered 7-18 are defined as the second group, and teeth 32 numbered 13-6 are defined as the third group; then, the enameled wire of the U-phase winding, V-phase winding, and W-phase winding is manually wound into each slot of the first, second, and third groups according to the phase sequence and winding relationship. The enameled wire is wound according to the winding direction, the required number of turns, and the position of the winding slots, using appropriate... The winding tension ensures that the enameled wire is tightly wound within the required slots. During the winding process, attention must be paid to the winding direction, the number of turns, and the magnitude of the winding tension to avoid the enameled wire breaking due to excessive tension, which could lead to the scrapping of the stator core 3, requiring rewinding, or causing the magnetic field direction of the stator core 3 to be incorrect after being energized due to reverse winding, thus causing the stator assembly to lose its basic function. In each winding, the two effective sides of any coil unit are located in two or three adjacent slots 31 of a tooth 32.

[0033] A qualified stator core 3 with windings can be connected in a star configuration, that is: the three ends of the U-phase winding, V-phase winding and W-phase winding are connected together to form a neutral point, and the three beginning ends are respectively connected to the three phase lines of the three-phase power supply with a phase difference of 120° between each pair of electromotive forces.

[0034] After optimizing and improving the winding method of the stator assembly, the winding efficiency and consistency of the coils were effectively improved, the problem of short wires during coil winding was effectively prevented, and the problem of large differences in three-phase current after the stator assembly was installed in the motor was eliminated. At the same time, the production efficiency of motor electronic components was also improved. In one production example, it took 0.5 days to wind one stator assembly using the existing technology, and about 15 days for a batch of 30 stator assemblies. After the improvement and optimization, a batch of 30 stator assemblies can be completed in only 7 days, which is nearly 50% more efficient.

Claims

1. An electric machine stator finishing tool, a stator core (3) comprising a circular annular yoke (33) and a plurality of protruding tooth portions (32) circumferentially and evenly distributed on the inner ring of the yoke (33), each two adjacent tooth portions (32) forming a tooth slot (31) therebetween; characterized in that: it comprises a winding tool (1) for winding a wire into a winding, and a stator core fixing tool (2) for sleeving a plurality of windings on the stator core (3) in a preset manner; the winding tool comprises a middle shaft (16), a limiting ring (12) connected to one end of the middle shaft (16), a handle (11) connected to the other side of the limiting ring (12), a plurality of continuous winding blocks (15) and a spacer block (14) sleeved on the middle shaft (16) in sequence, and a nut (13) detachably installed on the other end of the middle shaft (16); the spacer block (14) is square in shape, and a middle portion of each edge is provided with an edge slot (1503), and the center of the spacer block (14) is provided with a center through hole (1502), wherein a square mounting slot (1501) is arranged on the bottom surface near the tail winding block (15) side; each winding block (15) comprises a partition block (151) and a winding block (152) fixed to each other, wherein the size and structure of each partition block (151) are the same as those of the spacer block (14); each winding block (152) is square in shape and has a center through hole (1502) in the center thereof; each winding block (152) is square frustum-shaped and comprises a large end and a small end, wherein the large end is fixed to the partition block (151), and the small end is arranged in the mounting slot (1501) of the partition block (151) or the spacer block (14) of the next winding block (15) adjacent thereto; the shape of each mounting slot (1501) is adapted to the shape of the corresponding winding block (152); the sizes and relative positions of all center through holes (1502) are the same; each winding block (152) is used for winding a coil unit in the winding, and the edge slot (1503) is used for the wire connected to the corresponding coil unit to pass through. ​ The stator core fixing tool (2) comprises a support base (21), a mounting platform (22), a mounting frame (23) and two fixing plates (24); the upper end surface of the support base (21) is provided with a support column (212) in the middle, the lower end surface of the mounting platform (22) is provided with a hollow mounting column (221) matched with the support column (212) at the corresponding position, and the support column (212) is arranged in the hollow mounting column (221); the mounting frame (23) is vertically arranged on the mounting platform (22), a semicircular arc-shaped groove is arranged on the upper side of the mounting frame (23), and limiting convex arcs (231) for limiting and fixing the fixing plates (24) are arranged on the two sides of the semicircular arc-shaped groove; the two fixing plates (24) are vertically and closely arranged on the semicircular arc-shaped groove, each fixing plate (24) is annular, and a stepped hole (2401) with a step is arranged in the middle of each fixing plate (24), the large ends of the two stepped holes (2401) are located on the inner side and are used for placing the stator core (3), and the small ends of the two stepped holes (2401) are located on the outer side and are used for limiting the stator core (3).

2. The motor stator finishing tool according to claim 1, characterized in that: The number of the winding blocks (15) is 9-12.

3. The motor stator finishing tool according to claim 2, characterized in that: The included angle between the square frustum-shaped side surface of the winding block (152) and the central axis is 2.7-3.3°.

4. The motor stator finishing tool according to claim 3, characterized in that: The shape of the large end and the small end of each winding block (152) and each separation block (151) is a rounded square; and the cross-sectional shape of the central shaft (16) and the shape of each central through hole (1502) are both rounded rectangles.

5. The motor stator finishing tool according to claim 4, characterized in that: The number of the winding blocks (15) is twelve, and the included angle between the square frustum-shaped side surface of the winding block (152) and the central axis is 3°.

6. The motor stator finishing tool according to claim 5, characterized in that: The clearance fit is provided between each winding block (15) and the central shaft (16) and each adjacent winding block (15), and the fitting accuracy is 3-5 μm.

7. The motor stator finishing tool according to claim 6, characterized in that: The material of the central shaft (16) and the support base (21) is 45 steel, the material of each winding block (15) and the spacer block (14) is aluminum, and the surface is polished; the material of the mounting platform (22), the mounting frame (23) and the two circular fixing plates (24) is aluminum alloy; The lower end surface of the support base (21) is provided with a circular groove (211).

8. The motor stator finishing tool according to claim 7, characterized in that: The outer surface of the nut (13) adopts straight line knurling process.

9. A method of finishing a motor stator, characterized by, The motor stator finishing tool according to any one of claims 1-8 comprises the following steps: Step 1, all winding blocks (15) are sequentially sleeved on the center shaft (16), then the spacer block (14) is sleeved downstream of the winding block (15) at the tail, and the nut (13) is installed, to form the winding tool (1); Step 2, using the winding machine, a wire is wound from the winding block (15) of the winding tool (1) near the limiting ring (12) to the winding block (15) near the spacer block (14), and the wire is wound from the side of the winding block (15) to the side of the next winding block (15) through the slot (1503) closest to the spacer block (14), and then the wire is wound, until the preset number of coil units is reached; Step 3, remove the nut (13), and take the whole winding block (15), spacer block (14) and wire on the winding block (15) off the center shaft (16), then sequentially remove the spacer block (14) and each winding block (15), and separate the completed wire, to obtain a winding; Step 4, repeat steps 1-3 X times, and finally obtain X+1 windings, X is a positive integer; Step 5, test the resistance of all obtained windings, if there is a test unqualified winding, discard the winding and repeat steps 1-3 once, then test the resistance of the obtained winding, until all X+1 windings are qualified; Step 6, fix the support base (21) on the workbench, then install the mounting platform (22) on the support base (21), and fix the mounting frame (23) on the upper surface of the mounting platform (22); Step 7, prepare the stator core (3) and two fixed plates (24), place the stator core (3) in the stepped hole (2401) of the two fixed plates (24), and then place the combination of the two stator cores (3) and the two fixed plates (24) in the semicircular recess of the mounting frame (23); Step 8, sequentially sleeve X+1 qualified windings on the stator core (3) according to the preset rule, to form a stator core (3) with windings, and test the performance of the stator core (3) with windings, if it meets the preset requirements, the motor stator is completed; if it does not meet the requirements, all windings are removed and returned to step 1, until the performance test of the stator core (3) with windings meets the preset requirements, and the motor stator is completed.

10. The motor stator finishing method of claim 9, wherein: in step 4, X=2; the three qualified windings obtained in step 5 are defined as U-phase winding, V-phase winding and W-phase winding respectively; in step 7, the number of teeth (32) in the stator core (3) is eighteen. ​ ​

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