Electromagnetic bearing and bearing support assembly

Abstract

The invention provides an electromagnetic bearing and a bearing supporting assembly. The electromagnetic bearing comprises two bearing stators and a thrust disc. Each bearing stator comprises a stator base body and a plurality of stator lamination sets, the stator base body is provided with a plurality of first containing grooves distributed in the circumferential direction, and each stator lamination set is located in one first containing groove. The thrust disc and the bearing stators are coaxially arranged, and the thrust disc is located between the two bearing stators. The thrust disc comprises a rotor base body and a plurality of rotor lamination sets, the rotor base body is provided with a plurality of second containing grooves distributed in the circumferential direction, and each rotor lamination set is located in one second containing groove. The rotor lamination group comprises a plurality of rotor laminations which are stacked along the circumferential direction of the rotor base body. The stator base body and the rotor base body are made of non-magnetic materials; the stator laminations of the stator lamination group and the rotor laminations of the rotor lamination group are made of magnetic conductive materials.

Description

Technical Field

[0001] The present application relates to the field of bearing technology, and in particular to an electromagnetic bearing and a bearing support assembly. Background Art

[0002] Thrust electromagnetic bearings use electromagnetic force to achieve rotor suspension. They have the advantages of non-contact, high speed, high control accuracy and low wear. They are widely used in high-speed motors, precision instruments, aerospace and other fields.

[0003] When the axial load of an existing thrust electromagnetic bearing changes rapidly or with a large amplitude, the changing current will generate large induced eddy currents in the bearing stator and the bearing rotor. These eddy currents will not only weaken the dynamic bearing capacity of the electromagnetic bearing, but also cause energy loss, severe heat generation and other adverse phenomena. Summary of the invention

[0004] The present application provides an electromagnetic bearing and a bearing support assembly.

[0005] A first aspect of an embodiment of the present application provides an electromagnetic bearing, the electromagnetic bearing comprising:

[0006] Two bearing stators, each of the bearing stators comprises a stator base and a plurality of stator lamination groups, the stator base is provided with a plurality of first receiving grooves distributed along the circumferential direction, and each of the stator lamination groups is located in one of the first receiving grooves;

[0007] A thrust plate is coaxially arranged with the bearing stator and located between the two bearing stators; the thrust plate comprises a rotor base and a plurality of rotor lamination groups, the rotor base is provided with a plurality of second accommodating grooves distributed along the circumferential direction, and each rotor lamination group is located in one of the second accommodating grooves; the rotor lamination group comprises a plurality of rotor laminations stacked and arranged along the circumferential direction of the rotor base;

[0008] The materials of the stator matrix and the rotor matrix are both non-magnetic materials; the materials of the stator laminations of the stator lamination group and the rotor laminations of the rotor lamination group are both magnetic materials.

[0009] In one embodiment, a contour line of the orthographic projection of each stator lamination group on a plane perpendicular to the axis of the bearing stator is located outside a contour line of the orthographic projection of at least one rotor lamination group on the plane;

[0010] Alternatively, a contour line of the orthographic projection of each rotor lamination stack on a plane perpendicular to the axis of the bearing stator is located outside a contour line of the orthographic projection of at least one stator lamination stack on the plane.

[0011] In one embodiment, the number of the stator lamination stack is the same as the number of the rotor lamination stack;

[0012] The contour line of the orthographic projection of each stator lamination group on the plane is located outside the contour line of the orthographic projection of one rotor lamination group on the plane; or, the contour line of the orthographic projection of each rotor lamination group on the plane is located outside the contour line of the orthographic projection of one stator lamination group on the plane.

[0013] In one embodiment, the rotor base includes a first shell and a second shell, the first shell is provided with a first docking surface, the second shell is provided with a second docking surface, the first docking surface is connected to the second docking surface and forms the second accommodating groove.

[0014] In one embodiment, the first shell and the second shell are detachably connected.

[0015] In one embodiment, the stator lamination group further includes a first insulator, and in the same stator lamination group, the first insulator is provided between adjacent stator laminations; and / or,

[0016] The rotor lamination group also includes a second insulator. In the same rotor lamination group, a second insulator is arranged between adjacent rotor laminations.

[0017] In one embodiment, one of the rotor lamination group and the second receiving groove is provided with a limiting groove, and the other is provided with a limiting protrusion. When the rotor lamination group is arranged in the second receiving groove, the limiting protrusion is located in the limiting groove.

[0018] In one embodiment, the stator lamination stack and the rotor lamination stack are both provided with welding grooves for welding.

[0019] In one embodiment, the first accommodating grooves are evenly distributed along the circumference of the stator base; and the second accommodating grooves are evenly distributed along the circumference of the rotor base.

[0020] A second aspect of an embodiment of the present application provides a bearing support assembly, which includes a rotating shaft and the above-mentioned electromagnetic bearing, each bearing stator is provided with a through hole, the rotating shaft passes through the through holes of two bearing stators, and the thrust plate is connected to the rotating shaft.

[0021] The electromagnetic bearing provided in the embodiment of the present application has a plurality of stator laminations in a stator lamination group stacked along the circumference of a stator base, and a plurality of rotor laminations in a rotor lamination group stacked along the circumference of a rotor base. The stator laminations and the rotor laminations can cut off the flow path of the induced eddy currents flowing circumferentially in the electromagnetic bearing by separating the conductor into a plurality of thin sheets, shorten the path length of each eddy current, reduce the induced eddy currents, and thereby improve the dynamic load-bearing capacity of the electromagnetic bearing and reduce the energy loss and heat generation of the electromagnetic bearing.

[0022] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0024] Figure 1 A schematic diagram of the structure of a bearing stator provided in one embodiment of the present application;

[0025] Figure 2 for Figure 1 The embodiment shown provides a cross-sectional view of the bearing stator taken along AA;

[0026] Figure 3 A schematic structural diagram of a stator matrix provided in one embodiment of the present application;

[0027] Figure 4 A schematic diagram of the structure of a stator lamination group provided in one embodiment of the present application;

[0028] Figure 5 A schematic diagram of the structure of a bearing stator before processing provided in an embodiment of the present application;

[0029] Figure 6 for Figure 5 The embodiment shown provides a cross-sectional view of the bearing stator taken along BB;

[0030] Figure 7 A schematic diagram of the structure of a thrust plate provided in one embodiment of the present application;

[0031] Figure 8 for Figure 7 The embodiment shown provides a cross-sectional view of the thrust plate taken along CC;

[0032] Fig. 9 A schematic structural diagram of a first shell of a thrust plate provided in one embodiment of the present application;

[0033] Fig.10 A schematic diagram of the structure of the second shell of the thrust plate provided in one embodiment of the present application;

[0034] Fig.11 A schematic diagram of the structure of a rotor lamination stack provided in one embodiment of the present application;

[0035] Fig.12 A schematic diagram of the positional relationship and rotational relationship between a stator lamination group and a rotor lamination group provided in one embodiment of the present application;

[0036] Fig.13A schematic diagram of the positional relationship and rotational relationship between a stator lamination group and a rotor lamination group provided in another embodiment of the present application. DETAILED DESCRIPTION

[0037] Here, the technical solutions in the embodiments (or "implementations") of the present application will be described clearly and completely in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0038] If there are terms involving directional indications or positional relationships in the embodiments of the present application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. involved in the embodiments of the present application are only used for the purpose of convenience of description and cannot be understood as indicating or implying relative importance.

[0039] The electromagnetic bearing and the bearing support assembly of the embodiment of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can complement or combine with each other.

[0040] An embodiment of the present application provides an electromagnetic bearing, which includes two bearing stators and a thrust plate.

[0041] Among them, Figure 1 and Figure 2 As shown, each of the bearing stators 100 includes a stator base 10 and a plurality of stator lamination stacks 11. Figure 3 and Figure 4 As shown, the stator base body 10 is provided with a plurality of first receiving grooves 101 distributed along the circumferential direction, and each of the stator lamination stacks 11 is located in one of the first receiving grooves 101 .

[0042] The thrust plate is coaxially arranged with the bearing stator and is located between the two bearing stators. Figure 7 and Figure 8 As shown, the thrust plate 200 includes a rotor base 20 and a plurality of rotor lamination groups 21. The rotor base 20 is provided with a plurality of second receiving grooves 201 distributed along the circumferential direction, and each rotor lamination group 21 is located in one of the second receiving grooves 201. The rotor lamination group 21 includes a plurality of rotor laminations stacked and arranged along the circumferential direction of the rotor base 20.

[0043] The materials of the stator base 10 and the rotor base 20 are both non-magnetic materials, and the materials of the stator laminations of the stator lamination group 11 and the rotor laminations of the rotor lamination group 21 are both magnetic materials.

[0044] The thrust plate 200 can be connected to the rotating shaft to bear the axial load on the rotating shaft. The two bearing stators 100 are fixedly installed on both sides of the thrust plate 200 and maintain a certain axial gap with the thrust plate 200. The electromagnetic force between the bearing stator 100 and the thrust plate 200 can provide axial support for the rotating shaft, so that the rotating shaft remains stable in the axial direction and prevents the rotating shaft from moving in the axial direction.

[0045] The stator matrix 10 and the rotor matrix 20 are respectively used as the main supporting structures of the bearing stator 100 and the thrust plate 200, and can provide mechanical strength for the electromagnetic bearing. Since eddy currents mainly flow in magnetic conductive materials, when the stator matrix 10 and the rotor matrix 20 are made of non-magnetic conductive materials, the generation of eddy currents in the electromagnetic bearing can be reduced, thereby reducing the energy loss and heat generated by the electromagnetic bearing during operation.

[0046] When the stator laminations of the stator lamination group 11 and the rotor laminations of the rotor lamination group 21 are made of magnetic conductive materials, the magnetic field distribution can be effectively guided to make the magnetic field more concentrated. The multiple stator laminations of the stator lamination group 11 are stacked along the circumference of the stator base 10, and the multiple rotor laminations of the rotor lamination group 21 are stacked along the circumference of the rotor base 20. The stator laminations and the rotor laminations can cut off the flow path of the induced eddy current flowing along the circumferential direction in the electromagnetic bearing by separating the conductor into multiple thin sheets, shorten the path length of each eddy current, reduce the induced eddy current, and thus improve the dynamic load-bearing capacity of the electromagnetic bearing, and reduce the energy loss and heating phenomenon of the electromagnetic bearing.

[0047] In one embodiment, Figure 3 As shown, one of the two opposite surfaces of the stator matrix 10 is recessed inward to form a first receiving groove 101, and the first receiving grooves 101 are evenly distributed along the circumference of the stator matrix 10. Figure 1 As shown, the stator lamination group 11 is located in the first receiving groove, that is, the stator lamination group 11 is evenly distributed along the axial direction of the bearing stator 100. The above arrangement can ensure that the magnetic field is evenly distributed in the circumferential direction of the bearing stator 100, so that the electromagnetic bearing can better cope with the load changes in the axial direction, and improve the dynamic response capability and stability of the electromagnetic bearing.

[0048] In one embodiment, Figure 4 As shown, the stator lamination group 11 is composed of a plurality of stator laminations stacked together, each stator lamination has a notch at its edge, and after the plurality of stator laminations are stacked together, the notches of the stator laminations are connected to form welding grooves 111, which facilitates welding the plurality of stator laminations together.

[0049] In one embodiment, the stator lamination group 11 further includes a first insulator, and the first insulator is provided between adjacent stator laminations in the same stator lamination group 11. The first insulator can effectively isolate adjacent stator laminations, prevent current from flowing between the stator laminations, reduce the generation of eddy currents, and thus reduce energy loss.

[0050] In one embodiment, Figure 3 and Figure 4 As shown, a plurality of stator lamination groups 11 are respectively arranged in a first receiving groove 101, so that the stacking direction of the stator laminations of each stator lamination group 11 is the same as the circumferential direction of the stator matrix, and the composition is as follows: Figure 5 and Figure 6 The preliminary structure 100' of the bearing stator 100 is shown. The preliminary structure 100' of the bearing stator 100 is processed to obtain Figure 1 The bearing stator 100 is shown. In this embodiment, an annular groove is opened on the preliminary structure 100 ′ of the bearing stator 100 to form a wire groove 12 , and the wire groove 12 is used to accommodate the coil 121 .

[0051] In one embodiment, Fig. 9 and Fig.10 As shown, the rotor base includes a first shell 202 and a second shell 203, the first shell 202 is provided with a first docking surface 2021, the second shell 203 is provided with a second docking surface 2031, the first docking surface 2021 docks with the second docking surface 2031 and forms the second receiving groove 201. The first docking surface 2021 of the first shell 202 is recessed inward to form a sub-receiving groove 201', the second docking surface 2031 of the second shell 203 is recessed inward to form a sub-receiving groove 201", and the sub-receiving groove 201' and the sub-receiving groove 201" constitute a second receiving groove.

[0052] Combination Figure 7 It can be seen that the rotor base 20 is divided into the first shell 202 and the second shell 203 for easy manufacturing and assembly. After the rotor lamination group 21 is arranged in the sub-accommodation groove 201 ′, the second shell 203 is covered on the first shell 202 to assemble the thrust plate 200 .

[0053] In one embodiment, the first housing 202 and the second housing 203 are detachably connected. This arrangement facilitates maintenance and repair of the thrust plate 200.

[0054] exist Fig. 9 and Fig.10 In the illustrated embodiment, both the first shell 202 and the second shell 203 are provided with screw holes, and the first shell 202 and the second shell 203 are connected by bolts.

[0055] In one embodiment, Figure 7 and Figure 8 As shown, the second receiving grooves 201 are evenly distributed along the circumference of the rotor base 20. The rotor lamination group 21 is located in the second receiving grooves 201, that is, the rotor lamination group 21 is evenly distributed along the axial direction of the thrust plate 200. The above arrangement can ensure that the magnetic field is evenly distributed in the circumferential direction of the thrust plate 200, which is conducive to improving the dynamic response capability and stability of the electromagnetic bearing.

[0056] In one embodiment, Fig.11 As shown, the rotor lamination group 21 is composed of a plurality of rotor laminations stacked together, each rotor lamination has a notch at its edge, and after the plurality of rotor laminations are stacked, the notches of the rotor laminations are connected to form a welding groove 211, so as to facilitate welding the plurality of rotor laminations together.

[0057] In one embodiment, the rotor lamination group 21 further includes a second insulator, and a second insulator is provided between adjacent rotor laminations in the rotor lamination group 21. The second insulator can effectively isolate adjacent rotor laminations, prevent current from flowing between the rotor laminations, reduce the generation of eddy currents, and thus reduce energy loss.

[0058] In one embodiment, Fig.11 As shown, the rotor lamination group 21 is provided with a limiting protrusion 212, and the second receiving groove is provided with a limiting groove. When the rotor lamination group is set in the second receiving groove, the limiting protrusion 212 is located in the limiting groove. The design of the limiting protrusion and the limiting groove can ensure the accurate positioning and fixation of the rotor lamination group in the second receiving groove, and prevent the rotor lamination group from being displaced during the operation of the electromagnetic bearing. In other embodiments, a limiting groove can also be opened on the rotor lamination group, and a limiting protrusion can be set in the second receiving groove.

[0059] In one embodiment, Figure 1 and Figure 7 As shown, the contour line of the orthographic projection of each stator lamination group 11 on a plane perpendicular to the axis of the bearing stator 100 is located outside the contour line of the orthographic projection of at least one rotor lamination group 21 on the plane. The range surrounded by the contour line of the stator lamination group 11 is the effective action range of the magnetic field generated by the bearing stator. When the rotor lamination group 11 is located within the range of the contour line of the stator lamination group 11, it can be ensured that the electromagnetic force generated by the bearing stator effectively acts on the rotor.

[0060] In some other embodiments, the contour line of the orthographic projection of each rotor lamination group 21 on a plane perpendicular to the axis of the bearing stator 100 is located outside the contour line of the orthographic projection of at least one stator lamination group 11 on the plane.

[0061] In one embodiment, the number of the stator lamination groups 11 is the same as the number of the rotor lamination groups 21, and the contour line of the orthographic projection of each stator lamination group 11 on the plane is located outside the contour line of the orthographic projection of one rotor lamination group 21 on the plane. The number of stator lamination groups 11 and rotor lamination groups 21 is equal, which can ensure the symmetry and balance of the electromagnetic bearing, so that the electromagnetic bearing can be suitable for application scenarios of small-angle reciprocating motion.

[0062] like Fig.12 As shown, Fig.12 The relative position and rotation relationship between the stator lamination group 11 and the rotor lamination group 21 are shown. Fig.12 In the illustrated embodiment, the contour line of a rotor lamination group 21 is located within the contour line of a stator lamination group 11. The rotor lamination group 21 moves within the range surrounded by the contour line of the stator lamination group 11. When the thrust plate rotates circumferentially until the contour line of the rotor lamination group 21 coincides with the contour line 21', the thrust plate rotates in the opposite direction until the contour line of the rotor lamination group 21 coincides with the contour line 21", and then the thrust plate can be rotated back circumferentially until the contour line of the rotor lamination group 21 coincides with the contour line 21'. That is, the thrust plate can reciprocate at an angle of θ1 relative to the bearing stator in the circumferential direction.

[0063] In other embodiments, the number of the stator lamination groups 11 is the same as the number of the rotor lamination groups 21 , and the contour line of the orthographic projection of each rotor lamination group 21 on the plane is located outside the contour line of the orthographic projection of one stator lamination group 11 on the plane.

[0064] like Fig.13 As shown, the contour line of a stator lamination group 11 is located within the contour line of a rotor lamination group 21. When the thrust plate rotates circumferentially until the contour line of the rotor lamination group 21 coincides with the contour line 21', the thrust plate rotates in the opposite direction until the contour line of the rotor lamination group 21 coincides with the contour line 21", and then the thrust plate can be rotated back circumferentially until the contour line of the rotor lamination group 21 coincides with the contour line 21'. That is, the thrust plate can reciprocate at an angle of θ2 relative to the bearing stator in the circumferential direction. An embodiment of the present application also provides a bearing support assembly, the bearing support assembly includes a rotating shaft and the above-mentioned electromagnetic bearing. The two bearing stators of the electromagnetic bearing are respectively provided with through holes, and the rotating shaft passes through the through holes of the two bearing stators at the same time and is connected to the thrust plate. In some embodiments, the bearing support assembly can be used in precision machine tools or optical instruments and other equipment that perform small-angle reciprocating motion.

[0065] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without causing conflicts. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. An electromagnetic bearing, characterized in that: The electromagnetic bearing comprises: Two bearing stators, each of the bearing stators comprises a stator base and a plurality of stator lamination groups, the stator base is provided with a plurality of first receiving grooves distributed along the circumferential direction, and each of the stator lamination groups is located in one of the first receiving grooves; A thrust plate is coaxially arranged with the bearing stator and located between the two bearing stators; the thrust plate comprises a rotor base and a plurality of rotor lamination groups, the rotor base is provided with a plurality of second accommodating grooves distributed along the circumferential direction, and each rotor lamination group is located in one of the second accommodating grooves; the rotor lamination group comprises a plurality of rotor laminations stacked and arranged along the circumferential direction of the rotor base; The materials of the stator matrix and the rotor matrix are both non-magnetic materials; the materials of the stator laminations of the stator lamination group and the rotor laminations of the rotor lamination group are both magnetic materials.

2. The electromagnetic bearing according to claim 1, characterized in that: The contour line of the orthographic projection of each stator lamination group on a plane perpendicular to the axis of the bearing stator is located outside the contour line of the orthographic projection of at least one rotor lamination group on the plane; Alternatively, a contour line of the orthographic projection of each rotor lamination stack on a plane perpendicular to the axis of the bearing stator is located outside a contour line of the orthographic projection of at least one stator lamination stack on the plane.

3. The electromagnetic bearing according to claim 2, characterized in that: The number of the stator lamination stack is the same as the number of the rotor lamination stack; The contour line of the orthographic projection of each stator lamination group on the plane is located outside the contour line of the orthographic projection of one rotor lamination group on the plane; or, the contour line of the orthographic projection of each rotor lamination group on the plane is located outside the contour line of the orthographic projection of one stator lamination group on the plane.

4. The electromagnetic bearing according to claim 1, characterized in that: The rotor base includes a first shell and a second shell. The first shell is provided with a first docking surface, and the second shell is provided with a second docking surface. The first docking surface is connected to the second docking surface to form the second accommodating groove.

5. The electromagnetic bearing according to claim 4, characterized in that: The first shell and the second shell are detachably connected.

6. The electromagnetic bearing according to claim 1, characterized in that: The stator lamination group further includes a first insulator, and in the same stator lamination group, the first insulator is arranged between adjacent stator laminations; and / or, The rotor lamination group also includes a second insulator. In the same rotor lamination group, a second insulator is arranged between adjacent rotor laminations.

7. The electromagnetic bearing according to claim 1, characterized in that: One of the rotor lamination group and the second receiving groove is provided with a limiting groove, and the other is provided with a limiting protrusion. When the rotor lamination group is arranged in the second receiving groove, the limiting protrusion is located in the limiting groove.

8. The electromagnetic bearing according to claim 1, characterized in that: The stator lamination group and the rotor lamination group are both provided with welding grooves for welding.

9. The electromagnetic bearing according to claim 1, characterized in that: The first accommodating grooves are evenly distributed along the circumference of the stator base; and the second accommodating grooves are evenly distributed along the circumference of the rotor base.

10. A bearing support assembly, characterized in that: It comprises a rotating shaft and the electromagnetic bearing as claimed in any one of claims 1 to 9, each bearing stator is provided with a through hole, the rotating shaft passes through the through holes of two bearing stators, and the thrust plate is connected to the rotating shaft.

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