CN216564706U - Reinforcing apparatus in magnetizing coil sectional type - Google Patents
Reinforcing apparatus in magnetizing coil sectional type Download PDFInfo
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- CN216564706U CN216564706U CN202122870745.1U CN202122870745U CN216564706U CN 216564706 U CN216564706 U CN 216564706U CN 202122870745 U CN202122870745 U CN 202122870745U CN 216564706 U CN216564706 U CN 216564706U
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Abstract
The utility model provides a segmented inner support reinforcing device for a magnetizing coil, which belongs to the field of integral magnetizing of a permanent magnet motor rotor and comprises an insulating spacer layer and a plurality of high-strength alloy cylinders, wherein the insulating spacer layer is annular, the high-strength alloy cylinders are cylindrical, the inner diameters and the outer diameters of all the high-strength alloy cylinders are the same, and the insulating spacer layer and the high-strength alloy cylinders are matched in diameter and thickness so as to ensure that the insulating spacer layer is embedded between two adjacent high-strength alloy cylinders at intervals to realize insulation between the adjacent high-strength alloy cylinders during working. After the insulating spacer layer is embedded, the high-strength alloy cylinder and the insulating spacer layer form an integrated cylinder with smooth and flat inner and outer wall surfaces, and the integrated cylinder is arranged in the magnetizing coil and used as an internal supporting structure of the magnetizing coil to prevent the coil from deforming in the magnetizing process. The device can reduce the eddy effect, ensure the supporting strength, and has simple structure and convenient installation and use.
Description
Technical Field
The utility model belongs to the field of integral magnetization of a permanent magnet motor rotor, and particularly relates to a segmented inner support reinforcing device for a magnetizing coil.
Background
The integral magnetizing technology is a mode of magnetizing a magnetic pole through a special magnetizing coil after the magnetic pole without magnetism is assembled with a motor rotor. The magnetic pole is not provided with magnetism during assembly, so that the problem of magnetic repulsion force during assembly of the magnetic pole in the traditional pre-magnetizing mode is solved by the integral magnetizing technology, and the mounting precision and the production efficiency of the motor are greatly improved. Meanwhile, problems in special application scenes, such as the problem of magnetic pole demagnetization in a high-speed motor 'shrink fit' process and the problem of re-magnetization after demagnetization of a conventional motor, can also be solved through an integral magnetization technology. Therefore, as a magnetizing method having a remarkable advantage, a bulk magnetizing technique has been receiving attention in recent years.
In order to obtain a high magnetization field, the bulk magnetization technology generally employs a pulsed magnetic field for magnetization. Under the action of higher pulse current, the magnetizing coil is subjected to great electromagnetic stress, and because the structural strength of the coil is not enough, a coaxial high-strength alloy cylinder attached to the inner layer of the coil needs to be added into the coil to serve as an inner support reinforcing structure, so that the deformation of the coil is limited, and the stress safety of the magnetizing device is ensured. However, because the high-strength alloy cylinder has conductivity, eddy current is induced under the action of the pulse magnetic field, and the additional magnetic field generated by the eddy current can weaken the peak value of the magnetic field in the magnetizing region, so that unsaturated magnetization of the magnetic pole is caused, and the magnetic field in the magnetizing region is distorted, so that the magnetizing effect is seriously influenced.
Therefore, it is necessary to develop a novel internal support reinforcing structure for a magnetizing coil, which can effectively reduce the eddy current effect in the structure while providing sufficient support strength and restricting the deformation of the coil.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model aims to provide a segmented internal support reinforcing device for a magnetizing coil, which is characterized in that a segmented high-strength alloy cylinder is designed, and an insulating spacing layer is adopted to divide the high-strength alloy cylinder, so that the high-strength alloy cylinder can provide enough support strength, restrain the deformation of the coil and effectively reduce the eddy current effect in the structure.
In order to achieve the purpose, the utility model provides a segmented inner support reinforcing device for a magnetizing coil, which comprises an insulating spacer layer and a plurality of high-strength alloy cylinders, wherein the insulating spacer layer is annular, the high-strength alloy cylinders are cylindrical, the inner diameters and the outer diameters of all the high-strength alloy cylinders are the same, the diameters and the thicknesses of the insulating spacer layer and the high-strength alloy cylinders are matched, so that when the device works, the insulating spacer layer is embedded between two adjacent high-strength alloy cylinders at intervals, the insulation between the adjacent high-strength alloy cylinders is realized, after the insulating spacer layer is embedded, the high-strength alloy cylinders and the insulating spacer layer form an integral cylinder with smooth and flat inner and outer wall surfaces, and the integral cylinder is arranged in the magnetizing coil and used as an inner support structure of the magnetizing coil to prevent the coil from deforming in the magnetizing process.
In the utility model conception, the high-strength alloy cylinders are axially segmented, the concentric insulating spacing layers are arranged between the segmented alloy cylinders, and the eddy current is limited in the narrow and long loop of each segment of the alloy cylinder, so that the resistance value of the eddy current loop is effectively increased, the strength of the eddy current is reduced, and the weakening effect of the eddy current on the magnetization field is reduced. The sectional insulation structure cuts off the eddy current circulation path and reduces the influence of eddy current on the central magnetic field of the coil. The smooth external diameter is convenient for lay the magnetizing coil, better plays the interior supporting effect to the magnetizing coil, and the smooth internal diameter is convenient for place the rotor of waiting to magnetize.
Furthermore, two ports of the high-strength alloy cylinder are step-shaped, two ports of the insulating spacer layer are also step-shaped, and the ports of the insulating spacer layer and the ports of the high-strength alloy cylinder are mutually tightly and axially communicated into a whole in a concentric step mode.
Furthermore, the axial width of the insulation spacing layer is 1/50-1/15 of the width of the high-strength alloy cylinder.
Furthermore, the axial width of the insulation spacing layer is 1/50-1/25 of the width of the high-strength alloy cylinder.
Furthermore, the inner diameters of the high-strength alloy cylinder and the insulating spacer layer are slightly larger than the radius of the rotor to be magnetized, and the minimum radius which does not generate mechanical friction with the rotor to be magnetized is taken as the best radius, so that the influence of an air gap on the magnetizing effect is reduced.
Further, the length of each section of high-strength alloy cylinder is the same.
Further, the lengths of the sections of high-strength alloy cylinders are different.
And further, fixing the end part of the integrated cylinder by adopting a flange plate and a screw rod, wherein the axle center and the inner diameter of the flange plate are the same as those of the high-strength alloy cylinder.
Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
the utility model can reduce the eddy current effect, and particularly, the utility model axially segments the high-strength alloy cylinders, and the concentric insulating spacing layers are arranged between the segmented high-strength alloy cylinders to limit the eddy current in a long and narrow loop of each high-strength alloy cylinder, thereby effectively increasing the resistance value of the eddy current loop, reducing the strength of the eddy current and further reducing the weakening effect of the eddy current on a magnetization field.
The device is convenient to install and use, concentric steps with different inner diameters are matched with the end part of the high-strength alloy cylinder on the insulating spacing layer to ensure the concentricity of the assembled reinforcing structure, and a rotor to be magnetized is convenient to place. Meanwhile, the radial position of each section of cylinder is limited by the assembling mode of the concentric steps, so that the axial fixation of the assembled cylinder is simpler, and the end part fixation can be carried out through the flange plate and the screw rod.
The device ensures the supporting strength, still retains enough mechanical strength after axially segmenting the high-strength alloy cylinder, can provide stress support meeting the requirements for the magnetizing coil, and ensures the operation reliability of the magnetizing device.
The device of the utility model has flexible segmentation, and the number of segments of the axial segmentation of the high-strength alloy cylinder can be adjusted according to the intensity and distribution requirements of the required magnetizing magnetic field until the influence degree of the eddy current effect on the magnetizing field is reduced to the required level. Meanwhile, the axial length of each section of high-strength alloy cylinder can be adjusted according to the distribution characteristics of the eddy current in the magnetizing process, namely, the axial length of the high-strength alloy cylinder is reduced at the position with high eddy current strength, and the axial length of the high-strength alloy cylinder is increased at the position with low eddy current strength, so that the eddy current effect is weakened to the maximum extent.
Drawings
Fig. 1 is a sectional structure tooling diagram of an inner support reinforcement device in an embodiment of the utility model.
Fig. 2 is a graph showing the relationship between the number of segments of the inner support reinforcing structure and the magnetic field attenuation rate Sc and the peak value of the eddy current strength in the embodiment of the present invention.
FIG. 3 is a graphical representation of the distribution of vortex intensity in an axial direction within an inner support reinforcement structure in an embodiment of the present invention.
FIG. 4 is a schematic view of a uniform segmented internal support reinforcement structure in an embodiment of the present invention.
FIG. 5 is a schematic diagram of a non-uniform segmented internal support reinforcement structure according to an embodiment of the utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
The utility model provides a sectional type inner support reinforcing structure (or a device) which can effectively reduce the eddy current effect in the structure while ensuring enough support strength and restraining the deformation of a coil. The utility model discloses a segmented inner support reinforcing device for a magnetizing coil, which comprises a high-strength alloy cylinder and an insulating spacer layer, wherein the high-strength alloy cylinder is of a segmented structure, and the insulating spacer layer is inserted between the high-strength alloy cylinder and the insulating spacer layer. The high-strength alloy cylinder is made of materials with high compressive strength, no magnetic conductivity and high resistivity, such as stainless steel; the high-strength alloy cylinder is tightly attached to the inner layer of the magnetizing coil; the insulating spacing layer is the same as the inner diameter and the outer diameter of the high-strength alloy cylinder, clings to the end face of the high-strength alloy cylinder in a concentric step mode, and is assembled at intervals along the axial direction of the high-strength alloy cylinder. Generally, the axial width of the insulative spacer layer is 1/50-1/15 of the width of the high strength alloy cylinder.
The high-strength alloy cylinder has the function of providing enough stress support for the magnetizing coil, so that when the straight edge of the coil is subjected to transverse expansion caused by electromagnetic stress, and the center of the coil is collapsed, the high-strength alloy cylinder serves as an inner support structure to limit the deformation of the coil. Meanwhile, the material with non-magnetic conductivity and large resistivity is selected to reduce the influence of the eddy current effect in the conductor on the magnetizing magnetic field.
The insulating spacing layer is used for isolating vortex among the sections of cylinders and blocking a vortex passage in the conductor. Because the magnetizing direction is perpendicular to the axis of the permanent magnet motor rotor, the induced eddy current in the high-strength alloy cylinder is distributed along the longitudinal section of the cylinder body. Therefore, the high-strength alloy cylinder is axially segmented, the insulating spacing layers are inserted among the segments, the axial passage of the eddy current can be effectively blocked, and the eddy current is limited in the long and narrow loop of each high-strength alloy cylinder, so that the resistance value of the eddy current loop is increased, the eddy current strength is reduced, and the weakening effect of the eddy current on the magnetization field can be finally reduced.
The axial assembly mode of concentric steps is adopted between the insulating spacer layer and the high-strength alloy cylinder, the concentricity of the reinforced structure after assembly can be ensured, and the rotor to be magnetized can be placed conveniently. Meanwhile, the radial position of each section of the cylinder is limited by the assembling mode of the concentric steps, so that the axial reinforcement of the assembled cylinder is simpler, and the end part of the cylinder is fixed by a flange and a screw rod, wherein the axle center and the inner diameter of the flange are the same as those of the high-strength alloy cylinder.
Preferably, the axial width of the insulating spacer layer is 1/50-1/25 of the width of the high-strength alloy cylinder, the inner diameters of the high-strength alloy cylinder and the insulating spacer layer are slightly larger than the radius of the rotor to be magnetized, the minimum radius which does not generate mechanical friction with the rotor is used as an advantage, and the influence of an air gap on the magnetizing effect is reduced.
Fig. 1 is a sectional structure tooling diagram of an internal support reinforcement device in an embodiment of the present invention, and it can be seen that an application scenario thereof is to provide internal support reinforcement for a saddle-shaped magnetizing coil, where the sectional internal support reinforcement structure in the embodiment includes: a stainless steel cylinder 1 and an insulating spacer layer 2. The stainless steel cylinder 1 is tightly attached to the inner layer of the magnetizing coil; the insulating spacing layer 2 and the stainless steel cylinder 1 have the same inner and outer diameters, are tightly attached to the end face of the stainless steel cylinder 1 in a concentric step mode, and are assembled at intervals along the axial direction. The stainless steel cylinder 1 is made of AISI304 stainless steel.
The principle of the utility model is as follows:
the high-strength AISI304 stainless steel cylindrical structure which is attached to the inner layer of the coil and coaxial can provide enough stress support for the magnetizing coil, so that when the coil center collapses due to transverse expansion of the straight edge of the coil caused by electromagnetic stress, the high-strength AISI304 stainless steel cylindrical structure serves as an inner support structure to limit the deformation of the coil. The axial assembly mode of the concentric steps between the insulating spacer layer and the stainless steel cylinder can ensure the concentricity of the reinforced structure after assembly, and is convenient for placing a rotor to be magnetized. Meanwhile, the radial position of each section of cylinder is limited, so that the axial reinforcement of the assembled cylinder is simpler, and the end part of the assembled cylinder is fixed by the flange plate and the screw rod. Because the magnetizing direction is perpendicular to the axis of the permanent magnet motor rotor, the induced eddy current in the stainless steel cylindrical structure is distributed along the longitudinal section of the cylinder. Therefore, the stainless steel cylinder is axially segmented, so that the eddy current among the cylinders can be effectively isolated, and the axial passage of the eddy current in the conductor is blocked. The eddy current intensity is reduced while the eddy current area is limited, and the influence of the eddy current effect in the structure on the magnetization field is effectively limited.
As an embodiment, for a magnetizing region having a length of 300mm, the axial length of the stainless steel cylindrical inner support reinforcement structure is set to 600mm, and the excess length portion is used to support the coil end structure. In order to reduce the weakening effect of the eddy current effect in the stainless steel cylinder on the magnetizing magnetic field, the stainless steel cylinder is segmented. The finite element method is adopted for carrying out the segmentation test, the test result is shown in fig. 2, fig. 2 is a relational graph of the number of segments of the inner support reinforcing structure, the magnetic field attenuation rate Sc and the eddy current intensity peak value in the embodiment of the utility model, and as can be known from fig. 2, when the number of segments of the stainless steel cylinder reaches 12 segments, the eddy current intensity peak value is reduced to nearly 1/8 of the complete support cylinder structure, the weakening degree of the magnetization field peak value is reduced to 0.068% from 2.089%, and the influence of the eddy current effect reaches a negligible degree. Therefore, the stainless steel cylinder is divided into 12 sections, each section has an axial length of 49mm, and the axial thickness of the insulating spacer layer is 1mm, as shown in fig. 4, fig. 4 is a schematic diagram of the uniform sectional type internal support reinforcing structure in the embodiment of the utility model, and the lengths of the high-strength alloy cylinders of each section are the same.
Fig. 3 is a schematic diagram of axial eddy current strength distribution of the internal support reinforcement structure in the embodiment of the present invention, in order to reduce the eddy current effect to the maximum extent, the length of each high-strength alloy cylinder may also be adjusted according to the axial distribution characteristic of the eddy current strength in the magnetizing process shown in fig. 3, and the stainless steel cylinder may be segmented in a non-uniform manner, as shown in fig. 5, fig. 5 is a schematic diagram of a non-uniform segmented internal support reinforcement structure in the embodiment of the present invention, as can be seen from the figure, the lengths of each high-strength alloy cylinder are different, the eddy current strength at the center position is high, and the axial length of the high-strength alloy cylinder may be reduced appropriately; the eddy current intensity at the end part is small, and the axial length of the high-strength alloy cylinder can be properly increased. Test results show that the distribution of the magnetic field of the magnetizing region in the sectional form is nearly the same as that of the magnetizing region without the inner support reinforcing structure, so that the requirements of providing enough support strength and restraining the deformation of the coil and effectively reducing the eddy effect in the structure are met.
According to the utility model, two different things, namely the rotor to be magnetized and the magnetizing coil, are arranged in the magnetizing coil, and the sectional type internal support reinforcing device is used for supporting the magnetizing coil which is used for magnetizing the rotor to be magnetized.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the utility model, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A sectional type inner support reinforcing device for a magnetizing coil is characterized by comprising an insulating spacer layer and a plurality of high-strength alloy cylinders, wherein the insulating spacer layer is annular, the high-strength alloy cylinders are cylindrical, the inner diameter and the outer diameter of all the high-strength alloy cylinders are the same, the diameters and the thicknesses of the insulating spacer layer and the high-strength alloy cylinders are matched, so that the insulating spacer layer is ensured to be embedded between two adjacent high-strength alloy cylinders at intervals to realize the insulation between the adjacent high-strength alloy cylinders during working,
after the insulating spacer layer is embedded, the high-strength alloy cylinder and the insulating spacer layer form an integrated cylinder with smooth and flat inner and outer wall surfaces, and the integrated cylinder is arranged in the magnetizing coil and used as an internal supporting structure of the magnetizing coil to prevent the magnetizing coil from deforming in the magnetizing process.
2. The sectional internal support reinforcement device for the magnetizing coil of claim 1, wherein two ports of the high-strength alloy cylinder are stepped, two ports of the insulating spacer layer are also stepped, and the ports of the insulating spacer layer and the ports of the high-strength alloy cylinder are tightly and axially communicated with each other into a whole in a concentric step manner.
3. The segmented internal support reinforcement device for magnetizing coils of claim 2, wherein the axial width of the insulating spacer layer is 1/50-1/25 of the width of the high-strength alloy cylinder.
4. The segmented internal support reinforcement device for magnetizing coils of claim 3, wherein the axial width of the insulating spacer layer is 1/50-1/15 of the width of the high-strength alloy cylinder.
5. The segmented internal support reinforcement device for the magnetizing coil of claim 4, wherein the inner diameter of the high-strength alloy cylinder and the insulating spacer layer is slightly larger than the radius of the rotor to be magnetized, and the minimum radius which does not generate mechanical friction with the rotor to be magnetized is optimized, so that the influence of an air gap on the magnetizing effect is reduced.
6. The segmented internal support reinforcement of a magnetizing coil of claim 5, wherein each segment of high strength alloy cylinder has the same length.
7. The segmented internal support reinforcement of a magnetizing coil of claim 5, wherein the length of each high strength alloy cylinder is different.
8. The segmented internal support reinforcement device for the magnetizing coil of claim 6 or 7, wherein the end of the integral cylinder is fixed by a flange and a screw rod which have the same axis and inner diameter as the high-strength alloy cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122870745.1U CN216564706U (en) | 2021-11-22 | 2021-11-22 | Reinforcing apparatus in magnetizing coil sectional type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122870745.1U CN216564706U (en) | 2021-11-22 | 2021-11-22 | Reinforcing apparatus in magnetizing coil sectional type |
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| Publication Number | Publication Date |
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| CN216564706U true CN216564706U (en) | 2022-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122870745.1U Active CN216564706U (en) | 2021-11-22 | 2021-11-22 | Reinforcing apparatus in magnetizing coil sectional type |
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| CN (1) | CN216564706U (en) |
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- 2021-11-22 CN CN202122870745.1U patent/CN216564706U/en active Active
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