CN216564706U - A magnetizing coil segmented inner support reinforcement device - Google Patents

Abstract

The utility model provides a segmented inner support and reinforcement device for a magnetizing coil, which belongs to the field of integral magnetization of a permanent magnet motor rotor. The utility model comprises an insulating spacer layer and a plurality of high-strength alloy cylinders. The high-strength alloy cylinders are cylindrical, the inner and outer diameters of all high-strength alloy cylinders are the same, and the diameter and thickness of the insulating spacer layer and multiple high-strength alloy cylinders are matched, so as to ensure that the insulating spacer layers are embedded at intervals during operation. Between two adjacent high-strength alloy cylinders, the insulation between adjacent high-strength alloy cylinders is realized. After the insulating spacer layer is embedded, the high-strength alloy cylinder and the insulating spacer layer form an integrated cylinder with smooth inner and outer walls. The coil is deformed during magnetization. The device of the utility model can reduce the eddy current effect, ensure the supporting strength, has a simple structure, and is convenient to install and use.

Description

A magnetizing coil segmented inner support reinforcement device

technical field

The utility model belongs to the field of integral magnetization of a permanent magnet motor rotor, and more particularly relates to a segmented inner support reinforcement device of a magnetization coil.

Background technique

The overall magnetization technology is a method of magnetizing the magnetic poles through a special magnetizing coil after assembling the unmagnetized magnetic poles with the motor rotor. Since the magnetic poles are assembled without magnetism, the overall magnetization technology avoids the problem of magnetic repulsion when the magnetic poles are assembled in the traditional pre-magnetization method, and greatly improves the installation accuracy and production efficiency of the motor. At the same time, some problems in special application scenarios, such as the problem of magnetic pole demagnetization in the "shrink sleeve" process of high-speed motors, and the problem of re-magnetization after demagnetization of conventional motors, can also be solved by the overall magnetization technology. Therefore, as a magnetization method with significant advantages, the overall magnetization technology has received extensive attention in recent years.

In order to obtain a higher magnetization field, the overall magnetization technology usually uses a pulsed magnetic field for magnetization. Under the action of high pulse current, the magnetizing coil is subjected to great electromagnetic stress. Due to the insufficient structural strength of the coil itself, it is necessary to add a coaxial high-strength alloy cylinder that fits the inner layer of the coil as an inner support reinforcement structure. , in order to limit the deformation of the coil and ensure the safety of the magnetizing device. However, due to the electrical conductivity of the high-strength alloy cylinder itself, eddy currents will be induced under the action of the pulsed magnetic field. The additional magnetic field generated by the eddy currents will not only weaken the magnetic field peak value in the magnetization area, resulting in unsaturated magnetization of the magnetic poles, but also lead to the magnetic field in the magnetization area. Distorted, seriously affect the magnetization effect.

Therefore, it is necessary to develop a new type of inner support and reinforcement structure of the magnetizing coil, which can effectively reduce the eddy current effect in the structure while providing sufficient supporting strength and restraining the deformation of the coil.

Utility model content

In view of the defects of the prior art, the purpose of this utility model is to provide a magnetizing coil segmented inner support reinforcement device, design segmented high-strength alloy cylinders, and use insulating spacers to separate the high-strength alloy cylinders, It can provide sufficient support strength, restrain the deformation of the coil, and at the same time effectively reduce the eddy current effect in the structure.

In order to achieve the above purpose, the utility model provides a magnetizing coil segmented inner support and reinforcement device, which includes an insulating spacer layer and a plurality of high-strength alloy cylinders, the insulating spacer layer is annular, and the high-strength alloy cylinder is circular. The inner and outer diameters of all high-strength alloy cylinders are the same, and the diameter and thickness of the insulating spacer layer and multiple high-strength alloy cylinders are matched to ensure that the insulating spacer layer is embedded in two adjacent high-strength alloy cylinders at intervals during operation. Between the high-strength alloy cylinders, the insulation between the adjacent high-strength alloy cylinders is realized. After the insulating spacer layer is embedded, the high-strength alloy cylinder and the insulating spacer layer form an integrated cylinder with smooth inner and outer walls. The cylinder is arranged in the magnetizing coil and is used as a support structure in the magnetizing coil to prevent the coil from being deformed during the magnetizing process.

In the above inventive concept, the high-strength alloy cylinders are axially segmented, and concentric insulating spacers are installed between the segmented alloy cylinders to confine the eddy current in the narrow and long loop of each segment of the alloy cylinder, effectively increasing the eddy current. The resistance of the loop reduces the strength of the eddy current, thereby reducing the weakening effect of the eddy current on the magnetizing field. The segmented insulation structure cuts off the eddy current flow path and reduces the influence of the eddy current on the magnetic field at the center of the coil. The smooth outer diameter is convenient for laying the magnetizing coil, which can better support the magnetizing coil, and the smooth inner diameter is convenient for placing the rotor to be magnetized.

Further, the two ports of the high-strength alloy cylinder are stepped, and the two ports of the insulating spacer layer are also stepped. The ports of the insulating spacer layer and the port of the high-strength alloy cylinder are tightly and axially connected to each other by concentric steps.

Further, the axial width of the insulating spacer layer is 1/50-1/15 of the width of the high-strength alloy cylinder.

Further, the axial width of the insulating spacer layer is 1/50-1/25 of the width of the high-strength alloy cylinder.

Further, 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 smallest radius that does not cause mechanical friction with the rotor to be magnetized is the best, so as to reduce the influence of the air gap on the magnetization effect.

Further, each section of the high-strength alloy cylinder has the same length.

Further, the lengths of each high-strength alloy cylinder are different.

Further, the end of the one-piece cylinder is fixed by using a flange plate and a screw whose shaft center and inner diameter are the same as those of the high-strength alloy cylinder.

In general, compared with the prior art, the above technical solutions conceived by the present utility model have the following beneficial effects:

The utility model can reduce the eddy current effect. Specifically, the high-strength alloy cylinder is axially segmented, and a concentric insulating spacer is installed between the segmented high-strength alloy cylinders to limit the eddy current to the height of each segment. In the narrow and long loop of the strength alloy tube, the resistance of the eddy current loop is effectively increased, and the strength of the eddy current is reduced, thereby reducing the weakening effect of the eddy current on the magnetization field.

The device of the utility model is easy to install and use, and concentric steps with different inner diameters are designed on the insulating spacer layer and the end of the high-strength alloy cylinder to ensure the concentricity of the reinforced structure after assembly, and it is convenient to place the rotor to be magnetized. At the same time, the assembling method of the concentric steps limits the radial position of each barrel, which makes the axial fixing of the barrel after the assembly is simpler.

The device of the utility model ensures the support strength, and after the high-strength alloy cylinder is axially segmented, it still retains sufficient mechanical strength, can provide the required stress support for the magnetizing coil, and ensures the operation reliability of the magnetizing device.

The device of the utility model has flexible segments, and can adjust the number of segments in the axial segment of the high-strength alloy cylinder according to the required magnetizing magnetic field strength and distribution requirements until the influence of the eddy current effect on the magnetizing field is reduced to the required level. At the same time, the axial length of each high-strength alloy cylinder can be adjusted according to the distribution characteristics of the eddy current during the magnetization process, that is, the axial length of the high-strength alloy cylinder can be reduced at the position where the eddy current strength is large, and the axial length of the high-strength alloy cylinder can be increased at the position where the eddy current strength is small. The axial length of the large high-strength alloy barrel, thereby minimizing eddy current effects.

Description of drawings

Fig. 1 is a sectional structure tooling diagram of an inner support reinforcement device in an embodiment of the present invention.

2 is a graph showing the relationship between the number of segments of the inner support reinforcement structure, the magnetic field attenuation rate Sc and the peak value of the eddy current intensity in the embodiment of the present invention.

FIG. 3 is a schematic diagram of the distribution of the eddy current intensity in the inner support reinforcement structure along the axial direction in the embodiment of the present invention.

4 is a schematic diagram of a uniform segmented inner support reinforcement structure in an embodiment of the present invention.

5 is a schematic diagram of a non-uniform segmented inner support reinforcement structure according to an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not intended to limit the present invention.

The utility model provides a segmented inner support reinforcement structure (or referred to as a device) which can effectively reduce the eddy current effect in the structure while ensuring sufficient support strength and restraining the deformation of the coil. The utility model relates to a segmented inner support and reinforcement device for a magnetizing coil, which comprises a high-strength alloy cylinder and an insulating spacer layer, the high-strength alloy cylinder is a segmented structure, and the insulating spacer layer is inserted between the segments. The high-strength alloy cylinder must be made of materials with high compressive strength, non-magnetic conductivity and high resistivity, such as stainless steel; the high-strength alloy cylinder is closely attached to the inner layer of the magnetizing coil; the insulating spacer layer and the high-strength alloy The inner and outer diameters of the cylinders are the same, and they are closely attached to the end face of the high-strength alloy cylinder by means of concentric steps, and are assembled at intervals along the axial direction of the high-strength alloy cylinder. Generally, the axial width of the insulating spacer layer is 1/50 to 1/15 of the width of the high-strength alloy cylinder.

The function of the high-strength alloy cylinder is to provide enough stress support for the magnetizing coil, so that when the straight edge of the coil is subjected to electromagnetic stress and laterally expands, causing the center of the coil to collapse, it acts as an inner support structure to limit the deformation of the coil. At the same time, the selection of non-magnetic and high-resistivity materials can reduce the influence of the eddy current effect in the conductor on the magnetizing magnetic field.

The function of the insulating spacer layer is to isolate the eddy current between each section of the cylinder and block the eddy current path in the conductor. Since the magnetization direction is perpendicular to the axis of the rotor of the permanent magnet motor, the induced eddy current in the high-strength alloy cylinder is distributed along the longitudinal section of the cylinder. Therefore, axially segmenting the high-strength alloy cylinder and inserting insulating spacers between the segments can effectively block the axial passage of the eddy current, confine the eddy current to the narrow and long loop of each high-strength alloy cylinder, thereby increasing the eddy current loop. The resistance value of the eddy current can reduce the strength of the eddy current and finally reduce the weakening effect of the eddy current on the magnetizing field.

The axial assembly method of concentric steps is adopted between the insulating spacer layer and the high-strength alloy cylinder, which can ensure the concentricity of the reinforced structure after assembly, and is convenient for placing the rotor to be magnetized. At the same time, the assembly method of the concentric steps limits the radial position of each cylinder, which makes the axial reinforcement of the cylinder after assembly simpler. It can be fixed with the end of the screw.

Preferably, the axial width of the insulating spacer layer is 1/50 to 1/25 of the width of the high-strength alloy cylinder, and 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, so as not to cause mechanical friction with the rotor. The smallest radius is the best to reduce the influence of the air gap on the magnetization effect.

1 is a diagram of a segmented structure of an inner support reinforcement device in an embodiment of the present invention. As can be seen from the figure, its application scenario is to provide inner support reinforcement for a saddle magnetizing coil as an example. In this embodiment, the segmented inner support reinforcement is used as an example. The structure includes: a stainless steel cylinder 1 and an insulating spacer layer 2 . The stainless steel cylinder 1 is closely attached to the inner layer of the magnetizing coil; the insulating spacer layer 2 has the same inner and outer diameters as the stainless steel cylinder 1, and is closely attached to the end face of the stainless steel cylinder 1 by means of concentric steps, and is assembled at intervals along the axial direction. The stainless steel cylinder 1 is made of AISI304 stainless steel.

The principle of the present utility model is:

The concentric high-strength AISI304 stainless steel cylindrical structure that fits the inner layer of the coil can provide sufficient stress support for the magnetizing coil, so that when the straight edge of the coil is subjected to electromagnetic stress and lateral expansion causes the coil center to collapse, it can be used as the inner core. The support structure limits deformation of the coil. The axial assembly method of the concentric steps between the insulating spacer layer and the stainless steel cylinder can ensure the concentricity of the reinforced structure after assembly, which is convenient for placing the rotor to be magnetized. At the same time, the radial position of each section of the cylinder is limited, so that the axial reinforcement of the cylinder body after the assembly is completed is also simpler, and the ends can be fixed by the flange plate and the screw rod. Since the magnetization direction is perpendicular to the axis of the rotor of the permanent magnet motor, the induced eddy current in the stainless steel cylindrical structure is distributed along the longitudinal section of the cylindrical body. Therefore, axially segmenting the stainless steel cylinder can effectively isolate the eddy current between the cylinders of each segment and block the axial passage of the eddy current in the conductor. The eddy current intensity is reduced while confining the eddy current area, and the influence of the eddy current effect in the structure on the magnetization field is effectively limited.

As an example, for the magnetization area with a length of 300mm, the axial length of the stainless steel cylindrical inner support and reinforcement structure is set to 600mm, and the excess length 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 used to carry out the subsection test. The test results are shown in Figure 2. Figure 2 is a diagram showing the relationship between the number of subsections of the inner support reinforcement structure and the magnetic field attenuation rate Sc and the peak value of the eddy current strength in the embodiment of the present utility model. It can be seen that when the number of segments of the stainless steel cylinder reaches 12, the peak value of the eddy current intensity drops to nearly 1/8 of the complete supporting cylinder structure, the weakening degree of the peak value of the magnetization field is reduced from 2.089% to 0.068%, and the influence of the eddy current effect can be ignored. Degree. Therefore, the stainless steel cylinder is divided into 12 sections, the axial length of each section is 49mm, and the axial thickness of the insulating spacer layer is 1mm, as shown in FIG. The length of the high-strength alloy barrels of each section is the same.

Fig. 3 is a schematic diagram of the axial eddy current intensity distribution of the inner support reinforcement structure in the embodiment of the present invention. In order to weaken the eddy current effect to the greatest extent, it is also possible to adjust each section according to the axial distribution characteristics of the eddy current intensity during the magnetization process shown in Fig. 3 The length of the high-strength alloy cylinder, the stainless steel cylinder is segmented in a non-uniform way, as shown in Figure 5, which is a schematic diagram of the non-uniform segmented inner support reinforcement structure in the embodiment of the present utility model. It can be seen from the figure that each segment is The length of the high-strength alloy cylinder is different, and the eddy current strength at the center position is large, which can appropriately reduce the axial length of the high-strength alloy cylinder; the eddy current strength at the end position is small, and the axial length of the high-strength alloy cylinder can be appropriately increased. The test results show that the magnetic field distribution in the magnetization area in this segmented form is almost the same as that when the inner support reinforcement structure is not added. .

In the utility model, the rotor to be magnetized and the magnetized coil are two different things, and the segmented inner support and reinforcement device is arranged in the magnetized coil to support the magnetized coil, and the magnetized coil is used for the magnetized rotor to be magnetized. Magnetizing.

Those skilled in the art can easily understand that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and replacements made within the spirit and principles of the present invention Improvements, etc., should be included within the protection scope of the present invention.

Claims (8)

1. A magnetizing coil segmented inner support reinforcement device is characterized in that it comprises an insulating spacer layer and a plurality of high-strength alloy cylinders, the insulating spacer layer is annular, and the high-strength alloy cylinder is cylindrical, and all the The inner and outer diameters of the high-strength alloy cylinders are the same, and the diameter and thickness of the insulating spacer layer and multiple high-strength alloy cylinders match, so as to ensure that the insulating spacer layer is embedded between two adjacent high-strength alloy cylinders at intervals during operation. between the adjacent high-strength alloy cylinders to achieve insulation, After the insulating spacer layer is embedded, the high-strength alloy cylinder and the insulating spacer layer form an integrated cylinder with smooth inner and outer walls. The magnetizing coil is deformed during the magnetizing process. 2. A magnetizing coil segmented inner support reinforcement device according to claim 1, wherein the two ports of the high-strength alloy cylinder are stepped, and the two ports of the insulating spacer layer are also stepped, and the insulation The port of the spacer layer and the port of the high-strength alloy cylinder are in close axial communication with each other in the form of concentric steps. 3 . The magnetizing coil segmented inner support and reinforcement device according to claim 2 , wherein the axial width of the insulating spacer layer is 1/50 to 1/25 of the width of the high-strength alloy cylinder. 4 . 4 . The magnetizing coil segmented inner support and reinforcement device according to claim 3 , wherein the axial width of the insulating spacer layer is 1/50 to 1/15 of the width of the high-strength alloy cylinder. 5 . 5. A magnetizing coil segmented inner support reinforcement device as claimed in claim 4, characterized in that 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 at the same time it is not the same as the rotor to be magnetized. The minimum radius of mechanical friction of the rotor is the best, so as to reduce the influence of the air gap on the magnetization effect. 6 . The magnetizing coil segmented inner support and reinforcement device according to claim 5 , wherein each section of the high-strength alloy cylinder has the same length. 7 . 7 . The magnetizing coil segmented inner support and reinforcement device according to claim 5 , wherein the lengths of each section of the high-strength alloy cylinder are different. 8 . 8. A magnetizing coil segmented inner support and reinforcement device as claimed in claim 6 or 7, characterized in that, a flange plate and a screw rod whose shaft center and inner diameter are the same as those of the high-strength alloy cylinder are used to integrate the The end of the cylinder is fixed.

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