Assembly structure of permanent magnet motor

Abstract

The utility model belongs to the technical field of motor production equipment, and relates to an assembly structure of a permanent magnet motor, which comprises a fixed assembly component formed by a base, a stator and a rear end cover, and a movable assembly component formed by a rotor, a motor shaft, a bearing and a front end cover, the lower end of the rotor is sleeved with a guide cylinder, the guide cylinder is matched with a bearing installation hole of the rear end cover to form a lower centering structure, a plurality of guide wires protruding out of the outer circumferential face of the rotor are inserted into a magnetic steel auxiliary groove of the rotor, and the circumcircles of the guide wires are matched with the inner circle of the stator to form an upper centering structure. The assembling structure of the permanent magnet motor provided by the utility model has the advantages of accurate centering, high assembling precision and capability of greatly improving the assembling efficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field of motor production equipment, and relates to an assembly structure for a permanent magnet motor. Background Technology

[0002] During assembly, the permanent magnets attract the stator, making assembly and centering difficult. Conventionally, permanent magnet motors are assembled using either large, expensive specialized assembly machines or assembly machine tools. When using an assembly machine tool, the base, stator, and rear end cover are first assembled to form the first assembly assembly. The rotor, motor shaft, bearings, and front end cover are then assembled to form the second assembly assembly. The motor shaft is then clamped at both ends using center fixtures for centering and securing the second assembly assembly. Finally, the first assembly assembly is moved using a slide block to complete the assembly.

[0003] The aforementioned assembly structure uses a center clamp to fix and center the motor shaft, which is very difficult to operate and has low centering accuracy. Furthermore, assembly using a machine tool is extremely inefficient. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing an assembly structure for a permanent magnet motor, which features accurate centering, high assembly precision, and significantly improved assembly efficiency.

[0005] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution:

[0006] An assembly structure for a permanent magnet motor includes a fixed assembly assembly formed by a frame, a stator, and a rear end cover, and a movable assembly assembly formed by a rotor, a motor shaft, bearings, and a front end cover. The movable assembly assembly is vertically press-fitted to the fixed assembly assembly. A guide cylinder is fitted onto the lower end of the rotor. The guide cylinder is adapted to the bearing mounting hole of the rear end cover to form a lower centering structure. A plurality of guide wires protruding from the outer circumference of the rotor are inserted into the magnet auxiliary groove of the rotor. The outer circle of the guide wires is adapted to the inner circle of the stator to form an upper centering structure.

[0007] In the above-mentioned assembly structure of a permanent magnet motor, the guide tube is adapted to the bearing mounting hole of the rear end cover, and the outer circle of the guide wire is adapted to the inner circle of the stator, allowing a gap of a few wires between them.

[0008] In the above-mentioned assembly structure of a permanent magnet motor, the axial dimension of the guide cylinder is greater than the assembly stroke, the upper end of the guide cylinder is in contact with the bottom of the bearing, and the guide cylinder is coaxially arranged with the motor shaft. The outer diameter of the guide cylinder, the outer diameter of the bearing, and the diameter of the bearing mounting hole are the same, and the inner diameter of the guide cylinder is the same as the diameter of the motor shaft below the bearing.

[0009] In the above-mentioned assembly structure of a permanent magnet motor, each guide wire is individually inserted into a magnet auxiliary slot, and multiple guide wires are evenly distributed circumferentially. Preferably, there are four or more guide wires.

[0010] In the above-mentioned assembly structure of a permanent magnet motor, the axial length of the guide wire is greater than the axial length of the rotor, and the upper end of the guide wire extends beyond the rotor and the front end cover to form an extraction end.

[0011] In the assembly structure of the aforementioned permanent magnet motor, the guide wire is made of a metal wire with good elasticity.

[0012] In the above-described assembly structure of a permanent magnet motor, the fixed assembly component is fixed on the assembly base, and the movable assembly component is driven by a power device to move from top to bottom; the power device can be a conventional press-fitting device in the art, such as a motor or a cylinder.

[0013] In the above-mentioned assembly structure of a permanent magnet motor, the assembly base includes a first base plate and a second base plate arranged in an L-shape. The bottom of the base is fixedly connected to the first base plate, and the second base plate is provided with a clearance through hole for a clearance guide cylinder.

[0014] In the above-mentioned assembly structure of a permanent magnet motor, the assembly base is hinged to the frame by a pair of hinge seats, the hinge seats are located at the junction of the first base plate and the second base plate, and the assembly base is driven by a power device to rotate between the loading position and the assembly position.

[0015] When the assembly base is located at the loading position, the first base plate is horizontally distributed and the second base plate is vertically distributed.

[0016] When the assembly base is in the assembly position, the first base plate is vertically distributed and the second base plate is horizontally distributed.

[0017] Compared with the prior art, this utility model has the following advantages:

[0018] 1. This utility model provides an assembly structure for a permanent magnet motor, which changes the existing assembly structure of permanent magnet motors by adopting a vertical press-fit method, significantly improving assembly efficiency. This utility model uses guide cylinders and guide wires for double centering, which can prevent the permanent magnet from magnetically attracting the stator during assembly, improving assembly accuracy. Simultaneously, the guiding effect of the guide cylinders and guide wires allows for faster assembly, further improving efficiency.

[0019] 2. This utility model further provides a special tooling for assembling permanent magnet motors. Through the flip-type assembly base, it flips between the loading position and the assembly position during assembly, which can enable rapid loading and unloading and rapid assembly, further improving assembly efficiency. Attached Figure Description

[0020] Figure 1 This is a perspective view of the present invention;

[0021] Figure 2 yes Figure 1 Enlarged view of point A;

[0022] Figure 3 This is a cross-sectional view of the present invention;

[0023] Reference numerals in the attached drawings: 1. Frame; 2. Stator; 3. Rear end cover; 4. Rotor; 5. Motor shaft; 6. Bearing; 7. Front end cover; 8. Guide cylinder; 9. Bearing mounting hole; 10. Magnet auxiliary groove; 11. Guide wire; 12. Assembly base; 13. First base plate; 14. Second base plate; 15. Clearance through hole; 16. Hinge seat. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-3 :

[0025] An assembly structure for a permanent magnet motor includes a fixed assembly assembly formed by a base 1, a stator 2, and a rear end cover 3, and a movable assembly assembly formed by a rotor 4, a motor shaft 5, a bearing 6, and a front end cover 7. The movable assembly assembly is vertically press-fitted to the fixed assembly assembly. A guide cylinder 8 is fitted onto the lower end of the rotor 4. The guide cylinder 8 is adapted to the bearing mounting hole 9 of the rear end cover 3 to form a lower centering structure. A plurality of guide wires 11 protruding from the outer circumference of the rotor 4 are inserted into the magnet auxiliary groove 10 of the rotor 4. The outer circle of the guide wires 11 is adapted to the inner circle of the stator 2 to form an upper centering structure.

[0026] Comparison Appendix Figure 1 and attached Figure 3 The assembly method in this embodiment is as follows: First, the base 1, stator 2, and rear end cover 3 are assembled together to form a fixed assembly assembly. The rotor 4, motor shaft 5, bearing 6, and front end cover 7 are assembled together to form a movable assembly assembly. Before assembly, the fixed assembly assembly is fixed vertically on the tooling, and the guide cylinder 8 and guide wire 11 are installed in the predetermined positions of the movable assembly assembly. When assembly begins, the movable assembly assembly is placed above the fixed assembly assembly. In the initial state, the lower end of the guide cylinder 8 is inserted into the bearing mounting hole 9 of the rear end cover 3. The movable assembly assembly is driven downward by the power device, and the stator 2 is gradually inserted into the stator 2 and clearance-fitted with it. During the movement, the guide cylinder 8 and the bearing mounting hole 9 cooperate to form a lower centering structure, and the guide wire 11 and the inner circle of the stator 2 cooperate to form an upper centering structure. The upper and lower centering can ensure the concentricity between the fixed assembly assembly and the movable assembly assembly. At the same time, the guide cylinder 8 and the guide wire 11 can also provide a guiding function for installation. When the assembly is about to be completed, the guide wire 11 is pulled out from the gap between the base 1 and the front cover 7. After the assembly is completed, the guide cylinder 8 is pulled out from the motor shaft 5 to complete the assembly.

[0027] The aforementioned guide tube 8 is adapted to the bearing mounting hole 9 of the rear end cover 3, and the outer circle of the guide wire 11 is adapted to the inner circle of the stator 2. A gap of a few micrometers is allowed between the two. Under the premise of ensuring centering and guidance, friction can be avoided and movement can be facilitated.

[0028] To ensure smooth assembly, the axial dimension of the guide cylinder 8 is greater than the assembly stroke. The upper end of the guide cylinder 8 is in contact with the bottom of the bearing 6. In addition, the guide cylinder 8 is coaxially arranged with the motor shaft 5. The outer diameter of the guide cylinder 8, the outer diameter of the bearing 6, and the diameter of the bearing mounting hole 9 are the same. The inner diameter of the guide cylinder 8 is the same as the diameter of the motor shaft 5 below the bearing 6.

[0029] Each of the above-mentioned guide wires 11 is individually inserted into a magnet auxiliary groove 10. Multiple guide wires 11 are evenly distributed circumferentially. Guide wires 11 can be inserted into all magnet auxiliary grooves 10 or into some magnet auxiliary grooves 10. Preferably, there are four or more guide wires 11.

[0030] To facilitate the extraction of the guide wire 11, the axial length of the guide wire 11 is greater than the axial length of the rotor 4, and the upper end of the guide wire 11 extends beyond the rotor 4 and the front end cover 7 to form an extraction end.

[0031] In this embodiment, the guide wire 11 is a metal wire with good elasticity.

[0032] This embodiment also provides dedicated tooling for the above-mentioned assembly structure:

[0033] The aforementioned fixed assembly components are fixed on the assembly base 12, and the movable assembly components are driven by a power device to move from top to bottom; the power device can be a conventional press-fitting device in the art, such as a motor or cylinder.

[0034] Specifically, the assembly base 12 includes a first base plate 13 and a second base plate 14 arranged in an L-shape. The bottom of the base 1 is fixedly connected to the first base plate 13. The second base plate 14 is provided with a clearance through hole 15 for the clearance guide cylinder 8. Preferably, the clearance through hole 15 is a strip-shaped through hole, which is used to adapt to bases 1 of different specifications.

[0035] Furthermore, the assembly base 12 is hinged to the frame via a pair of hinge seats 16, which are located at the junction of the first base plate 13 and the second base plate 14. The assembly base 12 is driven by a power device to rotate between the loading position and the assembly position. After rotation, a locking device is provided on the frame to lock the assembly base 12. Furthermore, a bearing 6 is provided inside the hinge seat 16, and the assembly base 12 is rotatably connected to the hinge seat 16 via a hinge shaft. The power device can adopt various conventional mechanisms, such as a motor that drives the hinge shaft to rotate, or a cylinder that directly pulls / pushes the assembly base 12.

[0036] When the assembly base 12 is in the loading position, the first base plate 13 is horizontally distributed and the second base plate 14 is vertically distributed. The machine base 1 can be easily installed through the horizontally distributed first base plate 13.

[0037] When the assembly base 12 is in the assembly position, the first base plate 13 is vertically distributed and the second base plate 14 is horizontally distributed. The vertically distributed first base plate 13 can keep the axis of the fixed assembly component in a vertical state, thereby realizing vertical press fitting.

[0038] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. An assembly structure for a permanent magnet motor, characterized in that, The assembly includes a fixed assembly consisting of a base (1), a stator (2), and a rear end cover (3), and a movable assembly consisting of a rotor (4), a motor shaft (5), a bearing (6), and a front end cover (7). The movable assembly is vertically press-fitted with the fixed assembly. A guide cylinder (8) is fitted onto the lower end of the rotor (4). The guide cylinder (8) is adapted to the bearing mounting hole (9) of the rear end cover (3) and forms a lower centering structure. Several guide wires (11) protruding from the outer circumference of the rotor (4) are inserted into the magnet auxiliary groove (10) of the rotor (4). The outer circle of the guide wires (11) is adapted to the inner circle of the stator (2) and forms an upper centering structure.

2. The assembly structure of a permanent magnet motor according to claim 1, characterized in that, The axial dimension of the guide cylinder (8) is greater than the assembly stroke, and the upper end of the guide cylinder (8) is in contact with the bottom of the bearing (6).

3. The assembly structure of a permanent magnet motor according to claim 1, characterized in that, Each of the guide wires (11) is individually inserted into a magnetic auxiliary groove (10), and the multiple guide wires (11) are evenly distributed along the circumference.

4. The assembly structure of a permanent magnet motor according to claim 1, characterized in that, The axial length of the guide wire (11) is greater than the axial length of the rotor (4), and the upper end of the guide wire (11) extends beyond the rotor (4) and the front end cover (7) to form an extraction end.

5. The assembly structure of a permanent magnet motor according to claim 1, characterized in that, The fixed assembly component is fixed on the assembly base (12), and the movable assembly component is driven by a power device to move from top to bottom.

6. The assembly structure of a permanent magnet motor according to claim 5, characterized in that, The assembly base (12) includes a first base plate (13) and a second base plate (14) arranged in an L-shape. The bottom of the base (1) is fixedly connected to the first base plate (13), and the second base plate (14) is provided with a clearance through hole (15) for the clearance guide cylinder (8).

7. The assembly structure of a permanent magnet motor according to claim 6, characterized in that, The assembly base (12) is hinged to the frame by a pair of hinge seats (16), the hinge seats (16) are located at the junction of the first base plate (13) and the second base plate (14), and the assembly base (12) is driven by a power device to rotate between the loading position and the assembly position. When the assembly base (12) is located at the loading position, the first base plate (13) is horizontally distributed and the second base plate (14) is vertically distributed; When the assembly base (12) is in the assembly position, the first base plate (13) is vertically distributed and the second base plate (14) is horizontally distributed.

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