A method for attaching magnetic steel to the rotor of a permanent magnet motor

Abstract

The present invention discloses a method for attaching magnetic steel to a permanent magnet motor rotor. The permanent magnet motor rotor includes a rotating shaft, a magnetic steel, and a rotor barrel. The main steps of the method for attaching magnetic steel to the permanent magnet motor rotor are as follows: Step A: Apply an adhesive to the inner wall of the magnetic steel and / or the rotor barrel, and attach the magnetic steel evenly to the inner wall of the rotor barrel; Step B: Place the magnetic steel support device in the rotor barrel through the support telescopic mechanism. The magnetic steel support device includes a support body, and elastic arms corresponding to the magnetic steel one by one are evenly arranged along the circumferential direction of the support body. A support portion for abutting against the magnetic steel is arranged at the free end of the elastic arm, and a sleeve hole adapted to the rotating shaft is arranged at the center of the support body; Step C: After the adhesive is cured, take out the magnetic steel support device from the rotor barrel through the support telescopic mechanism. This support method uses a magnetic steel support device with a simple structure, low manufacturing cost, simple operation, and improves the manufacturing efficiency of the permanent magnet motor rotor.

Description

Technical Field

[0001] The present invention belongs to the technical field of permanent magnet motor production, and particularly relates to a method for attaching magnetic steel to a permanent magnet motor rotor. Background Art

[0002] In recent years, with the increasing emphasis on the environment, the country's attention to new energy has become more and more important. Permanent magnet motors, which have the advantages of simple structure, small size, light weight, low loss, and high efficiency, have received more and more attention and are widely used in industries such as new energy vehicles, water pumps, and fans to improve efficiency and reduce energy consumption.

[0003] However, during the production process of permanent magnet motors, adhesives are generally used to bond the magnetic steel to the rotor barrel. The natural curing of the adhesive generally takes about 24 hours, and the heat curing also takes about 2 hours, which is a relatively long time. During the curing process, due to factors such as its own weight, the magnetic steel will displace or loosen, resulting in a significant reduction in the adhesive force of the adhesive, and the magnetic steel cannot be tightly attached to the inner wall of the rotor barrel, posing a safety hazard in future use. Therefore, it is necessary to perform a certain support treatment on the magnetic steel to prevent the magnetic steel from displacing or loosening during the curing process of the adhesive, thus avoiding potential safety hazards.

[0004] In the prior art, there is a method for attaching magnetic steel using a magnetic steel attaching device with pressing to prevent the magnetic steel from displacing or loosening during the curing process of the adhesive. The magnetic steel attaching device with pressing used in this method requires making a slider mechanism on the installation tooling to expand the expansion core, attaching the magnetic steel to the inner wall of the rotor barrel, maintaining this expanded state and entering the magnetic steel curing process, and guiding grooves or guiding holes need to be machined during production. The entire device has a complex structure, high manufacturing cost, and is not easy for mass production; during use, the operation is cumbersome, resulting in low production efficiency of the permanent magnet motor rotor.

[0005] Therefore, it is necessary to explore a simple and reliable method for attaching magnetic steel to the permanent magnet motor rotor to prevent the magnetic steel from loosening or falling off during curing, reduce the manufacturing cost of the permanent magnet motor rotor, and improve the efficiency and stability of magnetic steel attachment. Summary of the Invention

[0006] The technical problem to be solved by the present invention is that the magnetic steel attaching device with pressing used in the method for attaching magnetic steel to the permanent magnet motor rotor in the prior art has a complex structure, high workpiece cost, and is not easy for mass production; the operation of this method is relatively cumbersome, and the production efficiency of the permanent magnet motor rotor is low.

[0007] To solve the above technical problems, the technical solution provided by the present invention is as follows:

[0008] In a first aspect, the present invention provides a method for attaching permanent magnets to a rotor of a permanent magnet motor. The permanent magnet motor rotor includes a rotating shaft, permanent magnets, and a rotor barrel. The rotating shaft is disposed at the center of the rotor barrel, and the permanent magnets are evenly surface-attached to the inner wall of the rotor barrel through an adhesive. The method for attaching permanent magnets to the rotor of the permanent magnet motor at least includes:

[0009] Step A: Apply the adhesive to the permanent magnets and / or the inner wall of the rotor barrel, so that the permanent magnets are evenly attached to the inner wall of the rotor barrel.

[0010] Step B: Connect the support telescopic mechanism to the connecting portion on the permanent magnet support device, and place the permanent magnet support device in the rotor barrel.

[0011] Wherein, the permanent magnet support device includes a support body; the support body is evenly provided with elastic arms corresponding to the permanent magnets in the circumferential direction. The free end of the elastic arm is provided with a support portion for abutting against the permanent magnet. A sleeve hole adapted to the rotating shaft is provided at the center of the support body. The permanent magnet support device is sleeved on the rotating shaft through the sleeve hole; the support telescopic mechanism includes a substrate, and a plurality of telescopic arms corresponding to the elastic arms are provided on the substrate, and a control member for controlling the telescopic arms.

[0012] The support telescopic mechanism drives the elastic arms to contract towards the middle through controlling the telescopic arms, places the permanent magnet support device into the rotor barrel, gradually releases the telescopic arms, the elastic potential energy of the elastic arms is released, the elastic arms expand, until the support portion abuts against the permanent magnet, and then the support telescopic mechanism is removed from the permanent magnet support device.

[0013] Step C: After the adhesive is cured, take out the permanent magnet support device from the rotor barrel through the support telescopic mechanism.

[0014] In a second aspect, the present invention provides another method for attaching permanent magnets to a rotor of a permanent magnet motor. The permanent magnet motor rotor includes a rotating shaft, permanent magnets, and a rotor barrel. The rotating shaft is disposed at the center of the rotor barrel, and two rings of permanent magnets are provided on the inner wall of the rotor barrel in the axial direction. The method for attaching permanent magnets to the rotor of the permanent magnet motor at least includes the following steps:

[0015] Step A: Apply the adhesive to the permanent magnets and / or the inner wall of the rotor barrel, so that the permanent magnets are evenly attached to the inner wall of the rotor barrel.

[0016] Step B: Connect the support telescopic mechanism to the connecting portion on the permanent magnet support device, and place two permanent magnet support devices in the rotor barrel.

[0017] Among them, the magnet support device includes a support body; the support body is evenly provided with elastic arms corresponding to the magnets one by one along the circumferential direction, a support portion for abutting against the magnet is provided at the free end of the elastic arm, a sleeve hole adapted to the rotating shaft is provided at the center of the support body, and the magnet support device is sleeved on the rotating shaft through the sleeve hole; the support telescopic mechanism includes a substrate, a plurality of telescopic arms corresponding to the elastic arms one by one are provided on the substrate, and a control member for controlling the telescopic arms;

[0018] Put two magnet support devices into the rotor barrel in sequence. Specifically, the support telescopic mechanism drives the elastic arms to contract towards the middle by controlling the telescopic arms, puts the magnet support device into the rotor barrel, gradually releases the telescopic arms, the elastic potential energy of the elastic arms is released, the elastic arms expand, until the support portion abuts against the magnet, and then the support telescopic mechanism is removed from the magnet support device;

[0019] Step C: After the adhesive is cured, take out the magnet support device from the rotor barrel through the support telescopic mechanism.

[0020] Further, during operation, it also includes that in step B, before putting the lower-layer magnet support device into the rotor barrel, the first positioning sleeve is sleeved on the rotating shaft, the first positioning sleeve is in the shape of a sleeve and limits the magnet support device; after putting the lower-layer magnet support device into the rotor barrel, the second positioning sleeve is sleeved on the rotating shaft, wherein the second positioning sleeve is in the shape of a sleeve and a positioning post is provided on the end face.

[0021] Further, a group of positioning holes are also provided on the support body, and the positioning holes are adapted to the positioning posts.

[0022] Further, the elastic arm extends synchronously outward along the circumferential direction and the radial direction from the periphery of the support body, and at this time, the end of the corresponding support portion for abutting against the magnet is an arc surface.

[0023] Further, the elastic arm expands and contracts in the radial direction, and at this time, the end of the corresponding support portion for abutting against the magnet is a plane.

[0024] Further, the connecting portion is a telescopic hole, the telescopic hole corresponds to the free end of the telescopic arm, the telescopic arm extends into the telescopic hole, and the expansion and contraction of the elastic arm is controlled.

[0025] Compared with the prior art, the method for attaching magnets to the permanent magnet motor rotor in this embodiment has the following beneficial effects:

[0026] (1) In the method for attaching magnetic steel to the rotor of the permanent magnet motor, a magnetic steel support device is used. The magnetic steel support device includes an integrally formed support body, elastic arms, and support feet. It has a simple structure and low manufacturing cost. The workpiece can be completed by one stamping, which is easy for mass production.

[0027] (2) Based on the elastic arms provided on the magnetic steel support device, the method for attaching magnetic steel to the rotor of the permanent magnet motor is to place the magnetic steel support device in the contracted state into the rotor barrel. After placement, the telescopic arm is gradually released through the support telescopic mechanism. The elastic potential energy of the elastic arm is released, the elastic arm expands, and the support part abuts against the magnetic steel to complete the support of the magnetic steel, preventing the magnetic steel from shifting or loosening during the curing process of the adhesive; the operation is simple and the manufacturing efficiency of the rotor of the permanent magnet motor is improved. Description of the Drawings

[0028] Figure 1 It is a side view when attaching magnetic steel to the rotor of the permanent magnet motor in Embodiment 1 of the present invention;

[0029] Figure 2 is Figure 1 a cross-sectional view along line A-A in

[0030] Figure 3 is Figure 1 a top view when attaching magnetic steel to the rotor of the permanent magnet motor in

[0031] Figure 4 It is a side view when attaching magnetic steel to the rotor of the permanent magnet motor in Embodiment 2 of the present invention;

[0032] Figure 5 is Figure 4 a cross-sectional view along line B-B in

[0033] Figure 6 is Figure 4 a top view when attaching magnetic steel to the rotor of the permanent magnet motor in

[0034] Figure 7 It is an exploded view when the magnetic steel support device supports double-layer magnetic steel;

[0035] Figure 8 It is a structural schematic diagram of the magnetic steel support device provided by an embodiment of the present invention;

[0036] Figure 9 It is a structural schematic diagram of another magnetic steel support device provided by an embodiment of the present invention;

[0037] Figure 10 It is a structural schematic diagram of another magnetic steel support device provided by an embodiment of the present invention;

[0038] Main reference numerals:

[0039] 1 - Support body; 10 - Support body; 11 - Elastic arm; 12 - Support part; 13 - Telescopic hole; 14 - Sleeve hole; 15 - Positioning hole; 16 - First positioning sleeve; 17 - Second positioning sleeve; 171 - Positioning post; 2 - Support telescopic mechanism; 21 - Substrate; 22 - Telescopic arm; 23 - Control part; 3 - Rotor barrel; 4 - Rotating shaft; 5 - Permanent magnet. Detailed implementation mode

[0040] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0042] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, an integral connection, or a detachable connection; it can be the communication inside two elements; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0043] Embodiment 1:

[0044] The permanent magnet motor rotor includes a rotating shaft 4, a permanent magnet 5 and a rotor barrel 3. The rotating shaft 4 is arranged at the center of the rotor barrel 3, and the permanent magnet 5 is evenly surface-mounted on the inner wall of the rotor barrel 3 through an adhesive.

[0045] The main steps for attaching the permanent magnet to the permanent magnet motor rotor are as follows:

[0046] Step A: Apply the adhesive to the inner wall of the permanent magnet 5 and / or the rotor barrel 3, so that the permanent magnet 5 is evenly attached to the inner wall of the rotor barrel 3;

[0047] Step B: Connect through the support telescopic mechanism 2 to the connection part on the permanent magnet support device 1, and place the permanent magnet support device 1 in the rotor barrel 3;

[0048] The permanent magnet support device 1 includes a support body 10, specifically refer to Figure 8, elastic arms 11 are evenly distributed along the circumferential direction of the support body 10. A support portion 12 for abutting against the permanent magnet 5 is provided at the free end of the elastic arm 11. A sleeve hole 14 adapted to the rotating shaft 4 is provided at the center of the support body 10. The permanent magnet support device 1 is sleeved on the rotating shaft 4 through the sleeve hole 14. A set of positioning holes 15 are also provided on the support body 10.

[0049] Among them, the number of elastic arms 11 corresponds to the number of permanent magnets 5, and can generally be 4, 6, 8, 10 or N, where N is an even number. In this embodiment, the number of elastic arms 11 is 8.

[0050] In this embodiment, the material forming the permanent magnet support device 1 is an elastic material, and the elastic material includes but is not limited to stainless steel spring steel.

[0051] The elastic arms 11 extend synchronously outward in the circumferential and radial directions from the periphery of the support body 10. At this time, the end of the support portion 12 for abutting against the permanent magnet 5 is an arc surface.

[0052] A connecting portion is provided on the support portion 12. The connecting portion can be a telescopic hole 13 or a telescopic pin. The shape of the telescopic hole 13 can be circular, square, long hole, or oval hole. In this embodiment, preferably, corresponding to the support telescopic mechanism 2, the connecting portion is set as the telescopic hole 13. For details, see Figure 7 , the support telescopic mechanism 2 includes a substrate 21, a telescopic arm 22 corresponding to the telescopic hole 13 is provided on the substrate 21, and a control member 23 for controlling the telescopic arm 22; the free end of the telescopic arm 22 is adapted to the size of the telescopic hole 13, and the telescopic hole 13 is preferably set as a long hole to facilitate the insertion or extraction of the telescopic arm 22.

[0053] During specific operation, by controlling the control member 23, the telescopic arm 22 is controlled to penetrate into the telescopic hole 13 of the permanent magnet support device 1, and the elastic arms 11 are controlled to contract towards the center direction of the permanent magnet support device 1. Place it in a suitable position, gradually release the telescopic arm 22 through the support telescopic mechanism 2, the elastic potential energy of the elastic arms 11 is naturally released, the elastic arms 11 expand outwards until the support portion 12 supports the permanent magnet 5, and the telescopic arm 22 of the support telescopic mechanism 2 is taken out from the telescopic hole 13. At this time, the state of the permanent magnet support device 1 in the rotor barrel 3 is as Figures 1 - 3 shown.

[0054] Step C: After the adhesive is cured, the permanent magnet support device 1 is taken out of the rotor barrel 3 through the support telescopic mechanism 2.

[0055] By inserting the telescopic arm 22 into the telescopic hole 13 of the permanent magnet support device 1, the telescopic arm 22 is contracted inward through the support telescopic mechanism 2, thereby driving the elastic arms 11 to contract towards the center direction of the permanent magnet support device 1, and the support portion 12 is separated from the permanent magnet 5, so as to take out the permanent magnet support device 1.

[0056] It should be noted that in this embodiment, the magnet support device 1 can adopt other forms.

[0057] As Figure 9 shown, another form of the magnet support device 1 is that the elastic arm 11 deforms by radial expansion and contraction. Specifically, deformation grooves 111 that are symmetric with each other are provided on both sides of the elastic arm 11. Based on the fact that its deformation direction is radial, the end of the support portion 12 for abutting against the magnet 5 is a plane.

[0058] As Figure 10 shown, another form of the magnet support device 1 is that the elastic arm 11 deforms by radial expansion and contraction. Specifically, asymmetric deformation grooves 111 are provided on both sides of the elastic arm 11. Based on the fact that its deformation direction is radial, the end of the support portion 12 for abutting against the magnet 5 is a plane.

[0059] The above are only three presentation forms of the relatively optimal magnet support device. The elastic arm 11 can be a curve, an arc, a straight line, or any combination of a curve, an arc, and a straight line.

[0060] Embodiment 2:

[0061] Refer to Figures 4 - 7 , this embodiment provides a method for attaching magnets to a permanent magnet motor rotor. Among them, the permanent magnet motor rotor includes a rotating shaft 4, a magnet 5, and a rotor barrel 3. The rotating shaft 4 is arranged at the center of the rotor barrel 3, and two circles of magnets 5 are arranged on the inner wall of the rotor barrel 3 along the axial direction. The main technical solution of this embodiment is similar to that of Embodiment 1. For the features not explained in this embodiment, the explanations in Embodiment 1 are adopted and will not be elaborated here.

[0062] The method for attaching magnets to the permanent magnet motor rotor at least includes the following steps:

[0063] Step A: Apply an adhesive to the magnet 5 and / or the inner wall of the rotor barrel 3 so that the magnet 5 is evenly attached to the inner wall of the rotor barrel 3;

[0064] Step B: Connect through the support telescopic mechanism 2 to the connection part on the magnet support device 1, and place two magnet support devices 1 in the rotor barrel 3 in sequence;

[0065] Among them, this embodiment may further include a first positioning sleeve 16 and a second positioning sleeve 17; the main bodies of the first positioning sleeve 16 and the second positioning sleeve 17 are sleeve-shaped. Among them, two groups of positioning posts 171 adapted to the positioning holes 15 on the magnet support device 1 are provided on the upper and lower end faces of the second positioning sleeve 17, and the positioning posts 171 on the upper and lower end faces are staggered by a certain angle in the vertical direction to fix the installation angle of the magnet support device 1. The corresponding operation is: <7000156>Before placing the magnet support device 1 on the lower layer, the first positioning sleeve 16 is sleeved on the rotating shaft 4, and the first positioning sleeve 16 is used to limit the magnet support device 1 on the lower layer.

[0067] After placing the magnet support device 1 on the lower layer into the rotor barrel, the second positioning sleeve 17 is sleeved on the rotating shaft 4. Among them, the positioning post 171 on the lower end surface of the second positioning sleeve 17 extends into the positioning hole 15 on the magnet support device 1. The magnet support device 1 on the upper layer is installed corresponding to the positioning post 171 on the upper end surface of the second positioning sleeve 17.

[0068] Step C: After the adhesive is cured, the magnet support device 1 is taken out of the rotor barrel 3 through the support telescopic mechanism 2.

[0069] It should be noted that according to the actual production situation, replacing the second positioning sleeve 17 with the first positioning sleeve 16, or not using the first positioning sleeve 16 or the second positioning sleeve 17 does not affect the essence of the present invention.

[0070] It should be noted that according to the actual production situation, the number of magnet support devices 1 installed can be adjusted without affecting the essence of the present invention.

[0071] In short, the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for attaching magnetic steel to a permanent magnet motor rotor, wherein, The permanent magnet motor rotor includes a rotating shaft (4), a permanent magnet (5), and a rotor barrel (3). The rotating shaft is disposed at the center of the rotor barrel. The permanent magnet is evenly surface-mounted on the inner wall of the rotor barrel by an adhesive. It is characterized in that the method for attaching the permanent magnet to the permanent magnet motor rotor at least includes: Step A: Apply the adhesive to the inner wall of the permanent magnet and / or the rotor barrel, and evenly attach the permanent magnet to the inner wall of the rotor barrel. Step B: Connect the support telescopic mechanism (2) to the connection part on the permanent magnet support device (1), and place the permanent magnet support device in the rotor barrel. Wherein, the permanent magnet support device includes a support body (10); the support body is evenly provided with elastic arms (11) corresponding to the permanent magnets one by one along the circumferential direction. The free end of the elastic arm is provided with a support part (12) for abutting against the permanent magnet. A sleeve hole (14) adapted to the rotating shaft is provided at the center of the support body. The permanent magnet support device is sleeved on the rotating shaft through the sleeve hole; the support telescopic mechanism includes a substrate (21), and a plurality of telescopic arms (22) corresponding to the elastic arms one by one are provided on the substrate, and a control member (23) for controlling the telescopic arms. The support telescopic mechanism drives the elastic arms to contract towards the middle by controlling the telescopic arms, places the permanent magnet support device into the rotor barrel, gradually releases the telescopic arms, the elastic potential energy of the elastic arms is released, the elastic arms expand, until the support part abuts against the permanent magnet, and then the support telescopic mechanism is removed from the permanent magnet support device. Step C: After the adhesive is cured, take out the permanent magnet support device from the rotor barrel through the support telescopic mechanism.

2. A method for attaching magnetic steel to a permanent magnet motor rotor, wherein, The permanent magnet motor rotor includes a rotating shaft, a permanent magnet, and a rotor barrel. The rotating shaft is disposed at the center of the rotor barrel. Two circles of permanent magnets are provided on the inner wall of the rotor barrel along the axial direction. It is characterized in that the method for attaching the permanent magnet to the permanent magnet motor rotor at least includes the following steps: Step A: Apply the adhesive to the inner wall of the permanent magnet and / or the rotor barrel, and evenly attach the permanent magnet to the inner wall of the rotor barrel. Step B: Connect the support telescopic mechanism to the connection part on the permanent magnet support device, and place two permanent magnet support devices in the rotor barrel. Wherein, the permanent magnet support device includes a support body; the support body is evenly provided with elastic arms corresponding to the permanent magnets one by one along the circumferential direction. The free end of the elastic arm is provided with a support part for abutting against the permanent magnet. A sleeve hole adapted to the rotating shaft is provided at the center of the support body. The permanent magnet support device is sleeved on the rotating shaft through the sleeve hole; the support telescopic mechanism includes a substrate, and a plurality of telescopic arms corresponding to the elastic arms one by one are provided on the substrate, and a control member for controlling the telescopic arms. Put two permanent magnet support devices into the rotor barrel in sequence. Specifically, the support telescopic mechanism drives the elastic arms to contract towards the middle by controlling the telescopic arms, places the permanent magnet support device into the rotor barrel, gradually releases the telescopic arms, the elastic potential energy of the elastic arms is released, the elastic arms expand, until the support part abuts against the permanent magnet, and then the support telescopic mechanism is removed from the permanent magnet support device. Step C: After the adhesive is cured, the magnet support device is taken out of the rotor barrel through the support telescopic mechanism.

3. The method for attaching magnetic steel to the permanent magnet motor rotor according to claim 2, wherein: During operation, it also includes that in step B, before the lower magnet support device is placed into the rotor barrel, the first positioning sleeve (16) is sleeved on the rotating shaft. The first positioning sleeve is in the shape of a sleeve and limits the magnet support device. After the lower magnet support device is placed into the rotor barrel, the second positioning sleeve (17) is sleeved on the rotating shaft. The second positioning sleeve is in the shape of a sleeve, and a positioning post (171) is arranged on the end face.

4. The method for attaching magnetic steel to the permanent magnet motor rotor according to claim 3, characterized in that: A set of positioning holes (15) are also arranged on the support body, and the positioning holes are adapted to the positioning posts.

5. The method for attaching magnetic steel to the permanent magnet motor rotor according to any one of claims 1-4, characterized in that: The elastic arms extend synchronously outward along the circumferential direction and the radial direction from the periphery of the support body.

6. The method for attaching magnetic steel to the rotor of a permanent magnet motor according to claim 5, characterized in that: One end of the support part for abutting against the magnet is an arc surface.

7. The method for attaching permanent magnets to the rotor of a permanent magnet motor according to any one of claims 1-4, characterized in that: The elastic arms deform by telescoping in the radial direction.

8. The method for attaching magnetic steel to the permanent magnet motor rotor according to claim 7, characterized in that: One end of the support part for abutting against the magnet is a plane.

9. The method for attaching magnetic steel to the permanent magnet motor rotor according to any one of claims 1-4, characterized in that: The connecting part is a telescopic hole, and the telescopic hole corresponds to the free end of the telescopic arm. The telescopic arm extends into the telescopic hole to control the telescoping of the elastic arms.

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