Motor stator and rotor assembly machine and assembly method thereof

Abstract

The invention relates to a motor stator and rotor assembly machine and an assembly method thereof. The motor stator and rotor assembly machine comprises a rack, and a rotor clamping mechanism, a stator clamping mechanism and an ejector pin positioning mechanism which are sequentially arranged on the rack at intervals from one end to the other end. The rotor clamping mechanism comprises a first supporting base, a clamping device installed on the first supporting base and a servo combined assembly electric cylinder, one end of the servo combined assembly electric cylinder is connected with the stator clamping mechanism, and the stator clamping mechanism can move close to or away from the rotor clamping mechanism under driving of the servo combined assembly electric cylinder. The stator clamping mechanism comprises a second supporting seat, a lifting driver, a base, a positioning clamping assembly and a positioning flange plate, wherein the second supporting seat is mounted on the rack in a sliding manner and is connected with the servo combined mounting cylinder; the lifting driver and the base are mounted on the second supporting seat and are connected with each other; the positioning clamping assembly and the positioning flange plate are mounted on the base; the motor stator and rotor assembly machine can replace manual assembly, and is high in assembly efficiency, good in assembly quality, good in assembly universality and very practical.

Description

Technical Field

[0001] The present invention relates to the technical field of permanent magnet motor assembly, and particularly to a motor stator-rotor assembly machine and an assembly method thereof. Background Art

[0002] A motor is an electromagnetic device that realizes the conversion or transmission of electrical energy based on the law of electromagnetic induction. A motor generally consists of a rotor and a stator. During motor production, the rotor and the stator need to be assembled, and the rotor is installed in the inner cavity of the stator according to regulations. However, the existing motor stator-rotor assembly usually adopts manual assembly or semi-automatic assembly methods. Among them, manual assembly has problems of low assembly efficiency and accuracy, and it is difficult to ensure the precise positional relationship of various components inside the motor, thus affecting the performance and stability of the motor. Although semi-automatic assembly improves the efficiency to a certain extent, for some high-precision assembly links, it still cannot meet the requirements, and the universality of the equipment is poor. For motors of different models, the equipment parameters need to be frequently adjusted. Summary of the Invention

[0003] Based on this, it is necessary to provide a motor stator-rotor assembly machine and an assembly method thereof with high assembly efficiency, good assembly quality and good assembly universality in view of the problems existing in the existing motor stator-rotor assembly.

[0004] A motor stator-rotor assembly machine includes: a frame, a rotor clamping mechanism, a stator clamping mechanism and a thimble positioning mechanism which are sequentially and spacedly arranged on the frame from one end to the other end; the rotor clamping mechanism includes a first support seat, a clamp and a servo assembly electric cylinder installed on the first support seat, one end of the servo assembly electric cylinder is connected to the stator clamping mechanism, and the stator clamping mechanism can move closer to or away from the rotor clamping mechanism under the drive of the servo assembly electric cylinder; the stator clamping mechanism includes a second support seat slidably installed on the frame and connected to the servo assembly cylinder, a lifting driver and a base installed on the second support seat and connected to each other, a positioning and clamping assembly and a positioning flange installed on the base, the positioning and clamping assembly is connected to the lifting driver, and both ends of the positioning and clamping assembly are respectively arranged opposite to the clamp and the positioning flange.

[0005] When the above-mentioned motor stator-rotor assembly machine is in use, place the stator to be installed on the positioning and clamping assembly for clamping and fixing. Then, drive the stator to rise and fall through the lifting drive to a preset specified position to be initially concentric with the thimble positioning mechanism. Place the rotor and the front end cover assembly on the clamp for clamping, and adjust the thimble positioning mechanism to tightly hold the tail of the rotor. Subsequently, the lifting drive drives to finely adjust the height of the stator so that the rotor and the stator maintain concentricity. Finally, control the servo combined electric cylinder to drive the stator clamping mechanism to move, so that the rotor and the front end cover assembly are pressed into the stator. Then, the worker locks the front end cover and the stator with screws to complete the assembly. Among them, the lifting drive can rise and fall according to the size of the stator, thereby ensuring concentricity with the rotor, being applicable to the assembly of different models, and having strong versatility. This motor stator-rotor assembly machine can replace manual assembly, with high assembly efficiency, good assembly quality, and good assembly versatility, and is very practical.

[0006] In one embodiment, the rotor clamping mechanism further includes a tension and compression sensor installed on the servo combined electric cylinder, and the tension and compression sensor is connected to the second support seat.

[0007] In one embodiment, the rotor clamping mechanism further includes a connecting rod connected to the servo combined electric cylinder, a grating reader head installed on the connecting rod, and a grating scale installed on the first support seat, and the grating reader head is arranged opposite to the grating scale.

[0008] In one embodiment, the servo combined electric cylinder includes a cylinder body, an electric cylinder driver connected to the cylinder body, and a piston rod extending from the cylinder body and connected to the electric cylinder driver, and the piston rod is connected to the second support seat.

[0009] In one embodiment, the servo combined electric cylinder further includes a handwheel drive rod connected to the cylinder body.

[0010] In one embodiment, the stator clamping mechanism further includes a manual fine adjuster installed on the bottom of the second support seat, and a fine adjustment drive rod passing through the second support seat and connected to the manual fine adjuster at one end, and the other end of the fine adjustment drive rod is connected to the base.

[0011] In one embodiment, at least three lifting guide rods are installed on the bottom of the base, and the lifting guide rods pass through the second support seat.

[0012] In one embodiment, the positioning and clamping assembly includes a lifting plate connected to the lifting drive, a positioning table installed on the lifting plate, and a set of relatively arranged clamping arms, and the set of clamping arms are symmetrically located on both sides of the positioning table.

[0013] In one embodiment, the positioning and clamping assembly further includes a support slide rail and a driving lead screw mounted on the lifting plate, and two driving bases slidably mounted on the support slide rail and threadedly connected to the driving lead screw, wherein the driving bases are connected to the bottom of the clamping arm.

[0014] In one embodiment, it further includes a control chassis mounted on the frame and partially wrapping the rotor clamping mechanism.

[0015] The present invention also discloses an assembly method for a motor stator-rotor assembly machine, which is applied to the motor stator-rotor assembly machine of any one of the above, and the assembly method includes: S1. Mount the stator on the stator clamping mechanism and clamp and fix it through the positioning and clamping assembly; S2. Control the lifting driver to lift the stator on the positioning and clamping assembly to a specified position and make it preliminarily concentric with the thimble positioning mechanism; S3. Clamp and fix the rotor with a front end cover on the clamp; S4. Adjust the thimble positioning mechanism to tightly hold the tail of the rotor; S5. Fine-tune the height of the stator to make the stator and the rotor maintain concentricity; S6. Drive the stator on the stator clamping mechanism to move towards the rotor through the servo fitting cylinder, so that the rotor is pressed into the stator; S7. Lock the front end cover and the stator with screws to complete the assembly. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the motor stator-rotor assembly machine of the present invention; Figure 2 It is Figure 1 A schematic diagram of the motor stator-rotor assembly machine shown lacking a control chassis; Figure 3 It is Figure 1 A usage state diagram of the motor stator-rotor assembly machine; Figure 4 It is Figure 1 A schematic diagram of the rotor clamping mechanism shown; Figure 5 It is Figure 4 Another perspective schematic diagram of the rotor clamping mechanism shown; Figure 6 It is Figure 1 A schematic diagram of the stator clamping mechanism shown; Figure 7 It is Figure 6 Another perspective schematic diagram of the stator clamping mechanism shown; Figure 8 is Figure 6 a partial schematic view of the stator clamping mechanism shown; Figure 9 is Figure 1 a partial schematic view including the thimble positioning mechanism shown; Figure 10 is a flowchart of the assembly method of the motor stator-rotor assembly machine provided by the present invention. Specific embodiments

[0017] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0018] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. In addition, the term "and / or" in this article is only a description of the associated relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. These three situations.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments. For example, terms such as "inside", "outside", "left", "right" and similar expressions are only for the purpose of illustration and are not intended to limit the present invention.

[0020] Please refer to Figures 1 to 9 , the motor stator-rotor assembly machine 100 of the present invention includes a frame 20, a rotor clamping mechanism 30, a stator clamping mechanism 40 and a thimble positioning mechanism 50 which are sequentially arranged at intervals from one end to the other end on the frame 20. Among them, the stator clamping mechanism 40 can move under the drive of the rotor clamping mechanism 30, so that the stator 200 (housing) on the stator clamping mechanism 40 and the rotor 300 on the rotor clamping mechanism 30 are assembled.

[0021] Furthermore, a plurality of universal wheels 21 are installed at the bottom of the frame 20. The universal wheels 21 facilitate the movement of the entire motor stator-rotor assembly machine 100 as needed. More preferably, the universal wheels 21 are provided with a self-locking structure, so that it is more convenient and stable to use.

[0022] Further, a mounting plate 22 is installed on the top of the frame 20. A set of moving slide rails 23 and a long opening 24 are provided on the mounting plate 22. The stator clamping mechanism 40 is slidably installed on the moving slide rails 23 and a part of it extends below the long opening 24, and the thimble positioning mechanism 50 is slidably installed on the moving slide rails 23.

[0023] Further, the rotor clamping mechanism 30 includes a first support base 31, a clamp 32 installed on the first support base 31, and a servo assembly electric cylinder 33. One end of the servo assembly electric cylinder 33 is connected to the stator clamping mechanism 40. The stator clamping mechanism 40 can move closer to or away from the rotor clamping mechanism 30 under the drive of the servo assembly electric cylinder 33. In this embodiment, the clamp 32 is a three-jaw chuck.

[0024] Further, the stator clamping mechanism 40 includes a second support base 41 slidably installed on the frame 20 and connected to the servo assembly cylinder 33, a lifting driver 42 and a base 43 installed on the second support base 41 and connected to each other, a positioning and clamping assembly 44 and a positioning flange 45 installed on the base 43. The positioning and clamping assembly 44 is connected to the lifting driver 42, and both ends of the positioning and clamping assembly 44 are disposed opposite to the clamp 32 and the positioning flange 45 respectively. The lifting driver 42 can drive the positioning and clamping assembly 44 to lift, thereby adjusting the height of the positioning and clamping assembly 44 to achieve preliminary positioning, and then achieving precise positioning through the positioning flange 45.

[0025] Further, the rotor clamping mechanism 30 further includes a tension and compression sensor 34 installed on the servo assembly electric cylinder 33. The tension and compression sensor 34 is connected to the second support base 41. The tension and compression sensor 34 can monitor the cooperation pressure in real time during the assembly process, and then cooperate to control the assembly pressure to ensure that the assembly pressure is within a suitable range.

[0026] Further, the rotor clamping mechanism 30 further includes a connecting rod 35 connected to the servo assembly electric cylinder 33, a grating head 36 installed on the connecting rod 35, and a grating scale 37 installed on the first support base 31. The grating head 36 is disposed opposite to the grating scale 37. During use, the grating head 36 will move along with the servo assembly electric cylinder 33 through the connecting rod 35. During the moving process, high-precision movement recognition is achieved in cooperation with the grating scale 37, and then high-precision movement control is achieved, and the assembly of the stator 200 and the rotor 300 can be realized according to a preset movement trajectory.

[0027] Further, the servo assembly electric cylinder 33 includes a cylinder block 331, an electric cylinder driver 332 connected to the cylinder block 331, and a piston rod 333 extending from the cylinder block 331 and connected to the electric cylinder driver 332. The piston rod 333 is connected to the second support seat 41. In this embodiment, the end of the piston rod 333 is connected to the tension and compression sensor 34, and the side of the piston rod 333 is connected to the connecting rod 35.

[0028] Further, the servo assembly electric cylinder 33 further includes a handwheel drive rod 334 connected to the cylinder block 331. By providing the handwheel drive rod 334, combined control of electric and manual operations can be achieved, enhancing the practicality. In this embodiment, both the electric driver 332 and the handwheel drive rod 334 are connected to the cylinder block 331 through a gearbox 335, and thus indirectly connected to the lead screw inside the cylinder block 331. The lead screw is threadedly connected to the piston rod 333.

[0029] Further, the stator clamping mechanism 40 further includes a manual fine adjuster 46 installed on the bottom of the second support seat 41, and a fine adjustment drive rod 47 passing through the second support seat 41 and connected to the manual fine adjuster 46 at one end. The other end of the fine adjustment drive rod 47 is connected to the base 43. The height of the base 43 can be finely adjusted through the manual fine adjuster 46, thereby adjusting the height of the stator on the positioning and clamping assembly 44, and further ensuring the concentricity between the rotor and the stator. In this embodiment, the manual fine adjuster 46 is driven by a handwheel, which is simple to operate and easy to apply force.

[0030] Further, at least three lifting guide rods 431 are installed on the bottom of the base 43, and the lifting guide rods 431 pass through the second support seat 41. In this embodiment, there are four lifting guide rods 431. The four lifting guide rods 431 can form four guiding support points, and the lifting stability is strong.

[0031] Further, the positioning and clamping assembly 44 includes a lifting plate 441 connected to the lifting driver 42, a positioning table 442 installed on the lifting plate 441, and a set of oppositely arranged clamping arms 443. The set of clamping arms 443 are symmetrically located on both sides of the positioning table 442. When in use, after the stator 300 is placed on the positioning table 442, it is clamped and fixed by the clamping arms 443.

[0032] Further, the positioning and clamping assembly 44 further includes a support slide rail 444 and a driving lead screw 445 mounted on the lifting plate 441, and two driving bases 446 slidably mounted on the support slide rail 444 and threadedly connected to the driving lead screw 445. The driving bases 446 are connected to the bottom of the clamping arms 443. The driving lead screw 445 has two threaded portions, and the thread rotation directions of the two ends of the threaded portions are opposite. Each threaded portion is threadedly connected to a driving base 446 respectively. In this way, when the driving lead screw 445 rotates, the two driving bases 446 can move synchronously closer or synchronously away, so as to complete the clamping action of the clamping arms 443. In this embodiment, the driving lead screw 445 is driven by a handwheel. Through the driving lead screw 445, the driving bases 446 and the clamping arms 443, the clamping and fixing of stators of different sizes can be realized, and the assembly of stators and rotors of different models can be completed, with strong versatility. In this embodiment, in order to ensure the stability of the lifting plate 441 during lifting, four lifting plate guide rods 447 are installed on the base 43, and the lifting plate guide rods 447 pass through the lifting plate 441.

[0033] Further, the thimble positioning mechanism 50 includes a thimble driving rod 51 mounted on the mounting plate 22, a thimble base 52 slidably mounted on the moving slide rail 23 and threadedly connected to the thimble driving rod 51, and a thimble 53 mounted on the thimble base 52. During use, rotating the thimble driving rod 51 can drive the thimble base 52 to move through the handwheel, and then drive the thimble 53 to move to tightly press the tail of the rotor.

[0034] Further, the motor stator-rotor assembly machine 100 further includes a control chassis 60 mounted on the machine frame 20 and partially wrapping the rotor clamping mechanism 30. A human-machine interaction display screen 61 is mounted on the control chassis 60. Through the human-machine interaction display screen 61, various parameters can be conveniently input or adjusted, facilitating the control chassis to achieve various controls.

[0035] For the above-mentioned motor stator-rotor assembly machine 100, during use, place the stator 200 to be installed on the positioning and clamping assembly 44 for clamping and fixing. Then, drive the stator 200 to rise and fall to a preset specified position through the lifting drive 42 to be initially concentric with the thimble positioning mechanism 50. Place the rotor 300 and the front end cover assembly on the clamp 32 for clamping, and adjust the thimble positioning mechanism 50 to tightly press the tail of the rotor 300. Subsequently, the lifting drive 42 drives to finely adjust the height of the stator 200 so that the rotor 300 and the stator 200 maintain concentricity. Finally, control the servo cooperative electric cylinder 33 to drive the stator clamping mechanism 40 to move, press the rotor 300 and the front end cover assembly into the stator 200. Then, the worker locks the front end cover and the stator 200 with screws to complete the assembly. Among them, the lifting drive 42 can rise and fall according to the size of the stator 200 to ensure concentricity with the rotor 300, suitable for assembling different models, with strong versatility. This motor stator-rotor assembly machine 100 can replace manual assembly, with high assembly efficiency, good assembly quality, and good assembly versatility, being very practical. The use of this motor stator-rotor assembly machine 100 significantly shortens the assembly time of the permanent magnet motor in the automated assembly process. Compared with manual and semi-automatic assembly, the production efficiency is increased by 2 times; the equipment can adapt to the assembly of various models of permanent magnet motors by inputting different parameters, without frequently adjusting the equipment hardware, reducing the equipment investment and adjustment costs of the enterprise.

[0036] Please refer to Figure 10 , the present invention also provides an assembly method for a motor stator-rotor assembly machine, which is applied to the motor stator-rotor assembly machine in any one of the above, and the assembly method includes: S1. Install the stator 200 on the stator clamping mechanism 40 and clamp and fix it through the positioning and clamping assembly 44.

[0037] Specifically, in step S1, the stator 200 is placed on the positioning table 442, and then clamped and fixed by two clamping arms 443; the stator 200 can be placed on the positioning table 442 by manual or robotic arm lifting.

[0038] S2. Control the lifting drive 42 to lift the stator 200 on the positioning and clamping assembly 44 to a specified position and be initially concentric with the thimble positioning mechanism 50.

[0039] Specifically, in step S2, the stator 200 and the thimble 53 in the thimble positioning mechanism 50 maintain initial concentricity.

[0040] S3. Clamp and fix the rotor 300 with the front end cover on the clamp 32.

[0041] Specifically, in step S3, the rotor 300 is manually placed on the three-jaw chuck for clamping.

[0042] S4. Adjust the thimble positioning mechanism 50 to tightly hold the tail of the rotor 300.

[0043] Specifically, in step S4, the thimble base 52 is driven to move by the thimble driving rod 51, so that the thimble 53 abuts against the tail of the rotor 300 and tightly holds it.

[0044] S5. Fine-tune the height of the stator 200 to keep the concentricity between the stator 200 and the rotor 300.

[0045] Specifically, in step S5, the manual fine-tuner 46 drives the base 43 to finely lift and lower, so that the stator 200 on the positioning table 442 is finely lifted and lowered.

[0046] S6. Drive the stator 200 on the stator clamping mechanism 40 by the servo assembling cylinder 33 to move towards the rotor 300, so that the rotor 300 is pressed into the stator 200.

[0047] Specifically, in step S6, the servo assembling cylinder 33 is controlled in a semi-automatic manner to drive the stator clamping mechanism 40 to move. The tension and compression sensor 34 on the servo assembling cylinder 33 detects the assembling pressure in real time, and cooperates with the grating reading head 36 and the grating scale 37 to complete the control of the moving position accuracy, so as to ensure the assembling in place. In this step, the position accuracy is controlled within ±0.01 mm, and the pressure accuracy is controlled within 0.5% FLS.

[0048] S7. Lock the front end cover and the stator with screws to complete the assembly.

[0049] Further, in another embodiment, before step S1, it also includes preparing the stator 200 and rotor 300 materials in advance, and checking whether the motor stator and rotor assembling machine 100 is at the initial zero position. If it is, step S1 is immediately carried out. If not, it is adjusted to the initial zero position and then step S1 is carried out.

[0050] Further, after step S7, it also includes the following steps: S8. Lift the assembled motor product by a crane for pre-unloading, then the driving rod 51 drives the thimble base 52 to move backward so that the thimble 53 is loosened from the tail of the rotor 300, and then the clamping release device 32 is driven to release. S9. Manually unload the assembled motor product, and return the motor stator and rotor assembling machine 100 to the initial zero position for the next use.

[0051] The technical features of the above embodiments can be combined arbitrarily. For the sake of brief description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0052] The embodiments described above merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A motor stator and rotor assembly machine, characterized in that: include: A frame, a rotor clamping mechanism, a stator clamping mechanism and a pin positioning mechanism installed on the frame in an interval arrangement from one end to the other end; the rotor clamping mechanism includes a first support seat, a clamp installed on the first support seat and a servo assembly electric cylinder, one end of the servo assembly electric cylinder is connected to the stator clamping mechanism, and the stator clamping mechanism can move closer to or away from the rotor clamping mechanism under the drive of the servo assembly electric cylinder; the stator clamping mechanism includes a second support seat slidably installed on the frame and connected to the servo assembly cylinder, a lifting drive and a base installed on the second support seat and connected to each other, a positioning clamping assembly and a positioning flange installed on the base, the positioning clamping assembly is connected to the lifting drive, and the two ends of the positioning clamping assembly are respectively arranged opposite to the clamp and the positioning flange.

2. The motor stator and rotor assembly machine according to claim 1, characterized in that: The rotor clamping mechanism also includes a tension and compression sensor installed on the servo assembly electric cylinder, and the tension and compression sensor is connected to the second support seat.

3. The motor stator and rotor assembly machine according to claim 1, characterized in that: The rotor clamping mechanism also includes a connecting rod connected to the servo assembled electric cylinder, a grating reader installed on the connecting rod, and a grating ruler installed on the first supporting seat, and the grating reader is arranged opposite to the grating ruler.

4. The motor stator and rotor assembly machine according to claim 1, characterized in that: The servo assembled electric cylinder comprises a cylinder body, an electric cylinder driver connected to the cylinder body, a piston rod extending from the cylinder body and connected to the electric cylinder driver, and the piston rod is connected to the second supporting seat.

5. The motor stator and rotor assembly machine according to claim 4, characterized in that: The servo assembled electric cylinder also includes a hand wheel driving rod connected to the cylinder body.

6. The motor stator and rotor assembly machine according to claim 1, characterized in that: The stator clamping mechanism also includes a manual fine-tuning device installed on the bottom of the second support seat, a fine-tuning driving rod passing through the second support seat and connected to the manual fine-tuning device at one end, and the other end of the fine-tuning driving rod is connected to the base.

7. The motor stator and rotor assembly machine according to claim 1, characterized in that: At least three lifting guide rods are installed on the bottom of the base, and the lifting guide rods pass through the second supporting seat.

8. The motor stator and rotor assembly machine according to claim 1, characterized in that: The positioning clamping assembly comprises a lifting plate connected to the lifting drive, a positioning platform installed on the lifting plate, and a group of clamping arms arranged opposite to each other, wherein the group of clamping arms are symmetrically located on both sides of the positioning platform.

9. The motor stator and rotor assembly machine according to claim 8, characterized in that: The positioning and clamping assembly also includes a supporting slide rail and a driving screw installed on the lifting plate, two driving bases slidably installed on the supporting slide rail and threadedly connected to the driving screw, and the driving base is connected to the bottom of the clamping arm; and also includes a control box installed on the frame and partially wrapping the rotor clamping mechanism.

10. An assembly method of a motor stator and rotor assembly machine, applied to the motor stator and rotor assembly machine according to any one of claims 1 to 9, characterized in that: The assembly method comprises: S1, installing the stator on the stator clamping mechanism and clamping and fixing it by the positioning clamping assembly; S2, controlling the lifting drive to lift the stator on the positioning clamping assembly to a specified position and make it initially concentric with the ejector positioning mechanism; S3, clamping and fixing the rotor with the front end cover on the clamp; S4, adjusting the ejector pin positioning mechanism so that the tail of the rotor is tightened; S5, fine-tuning the height of the stator to ensure that the stator and the rotor maintain concentricity; S6, driving the stator on the stator clamping mechanism to move toward the rotor through the servo assembly cylinder, so that the rotor is pressed into the stator; S7. Fasten the front end cover and the stator with screws to complete the assembly.

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