Machining method for outer rotor of motor

Abstract

The invention discloses a machining method for an outer rotor of a motor. The machining method comprises the steps that S1, one end of a rotating shaft is inserted into a shaft hole; s2, a centering tool used for improving the concentricity of the rotating shaft and an inner cavity of the barrel-shaped machine shell is placed on the inner side of the barrel-shaped machine shell to center the rotating shaft; s3, the rotating shaft is inserted into the centering hole, the baffle is placed into the positioning groove, and the two ends of the baffle are fixedly connected to the end of the cylindrical machine shell; s4, the centering tool is taken out, and a plurality of magnetic shoes are fixedly connected to the inner side wall of the cylindrical machine shell; s5, filling plastic among the cylindrical shell, the magnetic tile and the baffle plate so as to perform injection molding; according to the scheme, the concentricity of the rotating shaft and the barrel-shaped machine shell is guaranteed through the centering tool, through the technology that the rotating shaft is connected firstly and then the baffle is connected to the barrel-shaped machine shell, the machining precision error of parts is accumulated on the connecting position of the connecting block and the barrel-shaped machine shell, and therefore the concentricity of the rotating shaft and the barrel-shaped machine shell is guaranteed, and the rotating shaft connecting procedure is made to move forwards; defective products are exposed at the front end, so that the loss of the defective products is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of outer rotor motors, and in particular to a method for machining an outer rotor of a motor. Background Art

[0002] The outer rotor motor is a motor with a special structure. Its characteristic is that the rotor is located outside the stator. This design makes the motor have a larger heat dissipation area and a more compact structure. It is particularly suitable for applications that require high-speed operation or limited space. However, due to the particularity of the outer rotor structure, there are some technical difficulties in its processing and manufacturing process, such as the concentricity control of the rotor and stator, the stability of the magnetic tile, etc.

[0003] At present, in the assembly process of the external rotor motor, the barrel-shaped casing is generally first fine-machined, and the shaft mounting hole is opened at the bottom of the casing, and then the shaft is installed. The machining accuracy deviation of the parts will accumulate on the shaft mounting hole and the shaft, resulting in excessive concentricity deviation between the shaft and the casing, which will lead to increased vibration and noise when the motor is running, affecting the life of the motor.

[0004] The magnet is an important component in the outer rotor motor, responsible for generating the magnetic field. In traditional processing methods, the magnet is usually installed inside the cylindrical casing by bonding or mechanical fixing. However, these methods can easily cause the magnet to shift in position, affecting the performance of the motor, and in high temperature or high humidity environments, the adhesive may fail, causing the magnet to fall off.

[0005] The present invention is made based on the above situation. Summary of the invention

[0006] The invention overcomes the shortcomings of the prior art and provides a method for machining an outer rotor of a motor which can improve the concentricity of a rotating shaft and a cylindrical housing and strengthen the bonding strength of magnetic tiles.

[0007] The present invention is achieved through the following technical solutions:

[0008] A method for processing an outer rotor of a motor, the outer rotor comprising a rotating shaft and a cylindrical casing sleeved on the outer side of the rotating shaft, one end of the rotating shaft is connected to a baffle, the end of the baffle is connected to the cylindrical casing, a plurality of magnetic tiles are circumferentially distributed on the inner side wall of the cylindrical casing, and the cylindrical casing, the magnetic tiles and the baffle are formed by filling plastic with plastic overmolding;

[0009] The specific steps are as follows:

[0010] S1: A shaft hole is provided in the middle of the baffle, and one end of the rotating shaft is inserted into the shaft hole;

[0011] S2: A centering tool is placed inside the cylindrical casing to improve the concentricity between the rotating shaft and the inner cavity of the cylindrical casing. The centering tool comprises a column whose outer circle is in contact with the inner wall of the cylindrical casing. A centering hole is provided in the middle of the upper end of the column for inserting the rotating shaft. A positioning groove is also provided at the upper end of the column for positioning the baffle. The centering hole is connected to the positioning groove.

[0012] S3: insert the rotating shaft into the centering hole, put the baffle into the positioning groove, and fix the two ends of the baffle to the ends of the cylindrical casing;

[0013] S4: Take out the centering tool and fix a plurality of magnetic tiles on the inner wall of the cylindrical casing;

[0014] S5: Filling plastic between the cylindrical housing, the magnetic tile and the baffle to perform injection molding;

[0015] The order of step S1 and step S2 can be interchanged.

[0016] In the above-mentioned method for processing the outer rotor of a motor, the baffle is provided with blanking holes or blanking grooves or protrusions for increasing the injection molding strength.

[0017] In the above-mentioned method for processing the outer rotor of a motor, connecting blocks are provided at both ends of the baffle, and connecting grooves for placing the connecting blocks are provided at the ends of the cylindrical casing.

[0018] In the above-mentioned method for processing the outer rotor of a motor, the baffle includes a first connecting plate and a second connecting plate connected to the rotating shaft, the first connecting plate and the second connecting plate are both in the shape of long strips, and the first connecting plate and the second connecting plate are staggered to form an X shape or a cross shape.

[0019] In the above-mentioned method for processing the outer rotor of a motor, the shaft hole is a round hole, and a flange structure is stamped on the baffle plate corresponding to the shaft hole.

[0020] In the above-mentioned method for machining the outer rotor of a motor, the lower surface of the first connecting plate abuts against the upper surface of the second connecting plate, and the rotating shaft is interference-fitted with the hole wall of the shaft hole.

[0021] As described above, a method for processing the outer rotor of an electric motor, the connecting groove includes a first connecting groove for placing a connecting block on a first connecting plate and a second connecting groove for placing a connecting block on a second connecting plate, and the difference between the groove depth of the second connecting groove and the groove depth of the first connecting groove is equal to the thickness of the connecting block on the second connecting plate.

[0022] In the above-mentioned method for processing the outer rotor of a motor, the end of the rotating shaft is provided with a first installation flat section and a second installation flat section, and the shaft hole is a special-shaped hole with a flat position.

[0023] In the above-mentioned method for processing the outer rotor of a motor, a gap that can be filled with plastic is provided between the lower surface of the first connecting plate and the upper surface of the second connecting plate.

[0024] In a method for processing an outer rotor of an electric motor as described above, the connecting groove includes a first connecting groove for placing a connecting block on a first connecting plate and a second connecting groove for placing a connecting block on a second connecting plate, and the difference between the groove depth of the second connecting groove and the groove depth of the first connecting groove is equal to the thickness of the connecting block on the second connecting plate plus the distance between the lower surface of the first connecting plate and the upper surface of the second connecting plate.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. In this case, the concentricity of the rotating shaft and the cylindrical casing is ensured by the centering tool. By connecting the rotating shaft first and then connecting the baffle to the cylindrical casing, the machining accuracy errors of the parts are accumulated at the connection position between the connecting block and the cylindrical casing, thereby ensuring the concentricity of the rotating shaft and the cylindrical casing. This method moves the rotating shaft connection process forward, exposing defective products at the front end, and reducing the loss of defective products. The later the rotating shaft connection process is, the greater the loss and impact caused by defective products.

[0027] 2. The baffle is provided with a blanking hole, a blanking groove or a protrusion, so as to increase the injection strength and the bonding force between the plastic and the baffle.

[0028] 3. The cylindrical housing, magnetic tile and baffle are filled with plastic for overmolding. Compared with the magnetic tile installed inside the cylindrical housing by bonding or mechanical fixing, during the overmolding process, the plastic material will be evenly filled in the gap between the cylindrical housing, magnetic tile and baffle to form an integral structure, which helps to ensure the concentricity of the shaft and the cylindrical housing and reduce the eccentricity problem caused by assembly error; the plastic material will form a solid whole after curing, which enhances the connection strength between the various components and improves the overall structural stability of the motor. Even under long-term operation or dynamic load, it can maintain a good fixing effect; the plastic material has good corrosion resistance and weather resistance, and can maintain stable performance in various harsh environments. In addition, the shock absorption performance of the plastic also helps to reduce vibration and noise during motor operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0030] Figure 1 It is a schematic diagram of the structure of the cylindrical casing in the present invention;

[0031] Figure 2 It is a structural schematic diagram of the baffle in the present invention;

[0032] Figure 3It is a structural schematic diagram of the rotating shaft in the present invention;

[0033] Figure 4 It is a structural schematic diagram of the centering tooling in the present invention;

[0034] Figure 5 It is a schematic diagram of the process in which the baffle and the rotating shaft are connected to the cylindrical casing in the present invention;

[0035] Figure 6 It is a schematic diagram of the structure in which the magnetic tile is connected to the inner wall of the cylindrical casing in the present invention;

[0036] Figure 7 It is a schematic diagram of the structure of the cylindrical housing, the magnetic tile and the baffle plate in the present invention, which are formed by filling plastic and overmolding;

[0037] Figure 8 It is a schematic diagram of the structure of the rotating shaft of the present invention having a first installation flat section and a second installation flat section;

[0038] Fig. 9 It is a structural schematic diagram of the present invention in which the axial hole is a special-shaped hole. DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with the accompanying drawings:

[0040] like Figures 1 to 9 The outer rotor processing method of a motor is shown, the outer rotor includes a rotating shaft 1 and a cylindrical casing 2 sleeved on the outside of the rotating shaft 1, one end of the rotating shaft 1 is connected to a baffle 3, the end of the baffle 3 is connected to the cylindrical casing 2, a plurality of magnetic tiles 4 are evenly distributed circumferentially on the inner wall of the cylindrical casing 2, and the cylindrical casing 2, the magnetic tiles 4 and the baffle 3 are molded by filling plastic; wherein both ends of the above-mentioned cylindrical casing 2 are open.

[0041] The specific steps are as follows:

[0042] S1: A shaft hole 30 is provided in the middle of the baffle 3, and one end of the rotating shaft 1 is inserted into the shaft hole 30;

[0043] S2: A centering tool 5 for improving the concentricity between the rotating shaft 1 and the inner cavity of the cylindrical casing 2 is placed inside the cylindrical casing 2. The centering tool 5 includes a column 51 whose outer circle is in contact with the inner wall of the cylindrical casing 2. A centering hole 52 for inserting the rotating shaft 1 is provided in the middle of the upper end of the column 51. A positioning groove 53 for positioning the baffle 3 is also provided at the upper end of the column 51. The centering hole 52 is connected to the positioning groove 53.

[0044] S3: insert the rotating shaft 1 into the centering hole 52, put the baffle 3 into the positioning groove 53, and fix the two ends of the baffle 3 to the ends of the cylindrical housing 2;

[0045] S4: Take out the centering tool 5 and fix a plurality of magnetic tiles 4 on the inner wall of the cylindrical casing 2;

[0046] S5: Filling plastic between the cylindrical housing 2, the magnetic tile 4 and the baffle 3 to form an overmolding process;

[0047] The order of step S1 and step S2 can be interchanged.

[0048] In this case, the concentricity of the rotating shaft 1 and the cylindrical casing 2 is ensured by the centering tool 5. By connecting the rotating shaft 1 first and then connecting the baffle 3 to the cylindrical casing 2, the machining accuracy errors of the parts are accumulated at the connection position between the connecting block 301 and the cylindrical casing 2, thereby ensuring the concentricity of the rotating shaft 1 and the cylindrical casing 2. This method moves the connecting process of the rotating shaft 1 forward, exposing defective products at the front end, and reducing the loss of defective products. The later the connecting process of the rotating shaft 1 is, the greater the loss and impact caused by defective products. The cylindrical housing 2, the magnetic tile 4 and the baffle 3 are molded by filling plastic. Compared with the magnetic tile 4 being installed inside the cylindrical housing 2 by bonding or mechanical fixing, during the molding process, the plastic material will be evenly filled in the gap between the cylindrical housing 2, the magnetic tile 4 and the baffle 3 to form an integral structure, which helps to ensure the concentricity of the rotating shaft 1 and the cylindrical housing 2 and reduce the eccentricity problem caused by assembly error; the plastic material will form a solid whole after solidification, which enhances the connection strength between the various components and improves the overall structural stability of the motor, and can maintain a good fixing effect even under long-term operation or dynamic load; the plastic material has good corrosion resistance and weather resistance, and can maintain stable performance in various harsh environments. In addition, the shock-absorbing performance of the plastic also helps to reduce vibration and noise during motor operation.

[0049] Specifically, the cylindrical casing 2 is formed by rolling a strip-shaped plate. Compared with a conventional barrel-shaped casing formed by stretching or stamping, the cylindrical casing 2 improves the utilization rate of materials and simplifies the production process.

[0050] In some embodiments, the baffle 3 is provided with a blanking hole 300 or a blanking groove or a protrusion, so as to increase the injection strength and the bonding force between the plastic and the baffle 3. The shape of the baffle 3 includes but is not limited to a circular shape, a mesh shape, a long strip shape, etc. The baffle 3 is provided to connect the rotating shaft 1 and make the rotating shaft and the cylindrical housing 2 have a high concentricity.

[0051] Furthermore, connecting blocks 301 are provided at both ends of the baffle 3, and the end of the cylindrical housing 2 is provided with a connecting groove 21 for the connecting block 301 to be placed in. The connecting block 301 can be fixedly connected in the connecting groove 21 by welding, bonding or other connecting methods. The baffle 3 and the connecting block 301 are an integrated structure, thereby reducing installation errors.

[0052] In some embodiments, the baffle 3 includes a first connecting plate 31 and a second connecting plate 32 connected to the rotating shaft 1, the first connecting plate 31 and the second connecting plate 32 are both in the shape of long strips, and the connecting block 301 is connected to both ends of the first connecting plate 31 and the second connecting plate 32. The first connecting plate 31 and the second connecting plate 32 are staggered to form an X-shaped or cross-shaped bracket, so as to better connect to the cylindrical casing 2.

[0053] like Figure 2 As shown, in some embodiments, the shaft hole 30 is a round hole, and a flange structure 302 is stamped on the baffle plate 3 at the position corresponding to the shaft hole 30, and the rotating shaft 1 is interference fit with the hole wall of the shaft hole 30. The flange structure 302 can increase the sealing performance at the hole mouth, limit the entry of liquid, dust and other impurities into the motor, keep the interior clean, and extend the service life of the motor; when there is interference fit, a large contact pressure will be generated between the rotating shaft 1 and the hole wall, and the flange structure 302 can disperse this pressure, reduce the stress concentration at the hole mouth, and avoid the deformation or cracking of the hole mouth; the flange structure 302 increases the material thickness at the hole mouth, improves the overall strength and rigidity of the structure, and makes the hole mouth more solid and durable; it can increase the friction between the rotating shaft 1 and the hole wall to prevent the rotating shaft from loosening or falling off in the shaft hole 30.

[0054] Furthermore, the lower surface of the first connecting plate 31 abuts against the upper surface of the second connecting plate 32 , so that the connection between the first connecting plate 31 and the second connecting plate 32 and the rotating shaft 1 is more stable.

[0055] Furthermore, the connecting groove 21 includes a first connecting groove 211 for the connecting block 301 on the first connecting plate 31 to be placed in, and a second connecting groove 212 for the connecting block 301 on the second connecting plate 32 to be placed in. The difference between the groove depth of the second connecting groove 212 and the groove depth of the first connecting groove 211 is equal to the thickness of the connecting block 301 on the second connecting plate 32, so that the bottom of the connecting block 301 on the first connecting plate 31 can abut against the bottom of the first connecting groove 211, and the bottom of the connecting block 301 on the second connecting plate 32 can abut against the bottom of the second connecting groove 212, thereby facilitating welding.

[0056] like Figure 8 and Fig. 9 As shown, in one embodiment, the end of the rotating shaft 1 is provided with a first installation flat section 11 and a second installation flat section 12, and the shaft hole 30 is a flat special-shaped hole. The first installation flat section 11 and the second installation flat section 12 are transitionally matched with the hole wall of the special-shaped hole, and the special-shaped hole prevents the rotating shaft from rotating circumferentially. The transitionally matched can reduce the risk of deformation of the rotating shaft 1.

[0057] Furthermore, a gap that can be filled with plastic is provided between the lower surface of the first connecting plate 31 and the upper surface of the second connecting plate 32. The gap is filled with injection plastic, which can prevent the first connecting plate 31 and the second connecting plate 32 from axial displacement while increasing the bonding force between the plastic.

[0058] Furthermore, the connecting groove 21 includes a first connecting groove 211 for the connecting block 301 on the first connecting plate 31 to be placed in, and a second connecting groove 212 for the connecting block 301 on the second connecting plate 32 to be placed in. The difference between the groove depth of the second connecting groove 212 and the groove depth of the first connecting groove 211 is equal to the thickness of the connecting block 301 on the second connecting plate 32 plus the distance between the lower surface of the first connecting plate 31 and the upper surface of the second connecting plate 32, so that the bottom of the connecting block 301 on the first connecting plate 31 can abut against the bottom of the first connecting groove 211, and the bottom of the connecting block 301 on the second connecting plate 32 can abut against the bottom of the second connecting groove 212, thereby facilitating welding.

Claims

1. A method for processing an outer rotor of a motor, characterized in that: The outer rotor comprises a rotating shaft (1) and a cylindrical casing (2) sleeved on the outer side of the rotating shaft (1); one end of the rotating shaft (1) is connected to a baffle (3); the end of the baffle (3) is connected to the cylindrical casing (2); a plurality of magnetic tiles (4) are circumferentially distributed on the inner side wall of the cylindrical casing (2); the cylindrical casing (2), the magnetic tiles (4) and the baffle (3) are molded by filling plastic; The specific steps are as follows: S1: A shaft hole (30) is provided in the middle of the baffle (3), and one end of the rotating shaft (1) is inserted into the shaft hole (30); S2: A centering tool (5) for improving the concentricity between the rotating shaft (1) and the inner cavity of the cylindrical housing (2) is placed inside the cylindrical housing (2), the centering tool (5) comprising a column (51) whose outer circle is in contact with the inner wall of the cylindrical housing (2), a centering hole (52) for inserting the rotating shaft (1) is provided in the middle of the upper end of the column (51), and a positioning groove (53) for positioning the baffle (3) is also provided at the upper end of the column (51), and the centering hole (52) is connected to the positioning groove (53); S3: inserting the rotating shaft (1) into the centering hole (52), placing the baffle (3) into the positioning groove (53), and fixing the two ends of the baffle (3) to the ends of the cylindrical casing (2); S4: Take out the centering tool (5) and fix a plurality of magnetic tiles (4) on the inner wall of the cylindrical casing (2); S5: Filling plastic between the cylindrical housing (2), the magnetic tile (4) and the baffle (3) to perform overmolding; The order of step S1 and step S2 can be interchanged.

2. The method for processing an outer rotor of a motor according to claim 1, characterized in that: The baffle plate (3) is provided with a blanking hole (300) or a blanking groove or a protrusion for increasing the injection strength.

3. The method for processing an outer rotor of a motor according to claim 2, characterized in that: Connecting blocks (301) are provided at both ends of the baffle (3), and a connecting groove (21) for receiving the connecting block (301) is provided at the end of the cylindrical casing (2).

4. The method for processing an outer rotor of a motor according to claim 3, characterized in that: The baffle (3) comprises a first connecting plate (31) and a second connecting plate (32) connected to the rotating shaft (1); the first connecting plate (31) and the second connecting plate (32) are both in the shape of long strips; the first connecting plate (31) and the second connecting plate (32) are staggered to form an X shape or a cross shape.

5. The method for processing an outer rotor of a motor according to claim 4, characterized in that: The shaft hole (30) is a circular hole, a flange structure (302) is punched on the baffle plate (3) at a position corresponding to the shaft hole (30), and the rotating shaft (1) is interference-fitted with the hole wall of the shaft hole (30).

6. The method for machining an outer rotor of a motor according to claim 5, characterized in that: The lower surface of the first connecting plate (31) abuts against the upper surface of the second connecting plate (32).

7. The method for machining an outer rotor of a motor according to claim 6, characterized in that: The connecting groove (21) comprises a first connecting groove (211) for receiving a connecting block (301) on the first connecting plate (31) and a second connecting groove (212) for receiving a connecting block (301) on the second connecting plate (32), wherein the difference between the groove depth of the second connecting groove (212) and the groove depth of the first connecting groove (211) is equal to the thickness of the connecting block (301) on the second connecting plate (32).

8. The method for machining an outer rotor of a motor according to claim 4, characterized in that: The end of the rotating shaft (1) is provided with a first installation flat section (11) and a second installation flat section (12), and the shaft hole (30) is a special-shaped hole with a flat position.

9. The method for machining an outer rotor of a motor according to claim 7, characterized in that: A gap that can be filled with plastic is provided between the lower surface of the first connecting plate (31) and the upper surface of the second connecting plate (32).

10. The method for machining an outer rotor of a motor according to claim 9, characterized in that: The connecting groove (21) comprises a first connecting groove (211) for receiving a connecting block (301) on the first connecting plate (31) and a second connecting groove (212) for receiving a connecting block (301) on the second connecting plate (32), wherein the difference between the groove depth of the second connecting groove (212) and the groove depth of the first connecting groove (211) is equal to the thickness of the connecting block (301) on the second connecting plate (32) plus the distance between the lower surface of the first connecting plate (31) and the upper surface of the second connecting plate (32).

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