阅读说明：本技术 轴向磁悬浮轴承、电机 (Axial magnetic suspension bearing and motor ) 是由 邹志堂 龚高 张芳 李欣 邓明星 钟敦颖 于 2021-10-08 设计创作，主要内容包括：本发明提供一种轴向磁悬浮轴承、电机,其中的轴向磁悬浮轴承,包括两个铁芯组件,两个所述铁芯组件相对平行设置且形成安装间隙,所述安装间隙内设有与转子连接的止推盘,所述铁芯组件中的铁芯朝向所述止推盘的第一端面内设有滚动体,所述滚动体具有凸出于所述第一端面的部分。根据本发明,一方面,通过设于所述铁芯的第一端面上的滚动体能够在轴承悬浮不稳定或者磁悬浮系统断电时将所述止推盘与铁芯之间的滑动摩擦转变为滚动摩擦,有效避免止推盘的损坏,降低成本；另一方面,将转子的轴向保护结构集成于所述轴向磁悬浮轴承上,结构更加简单的同时还能够有利于转子的轴向长度的缩短,减小转子的重量,进而降低电机能耗。(The invention provides an axial magnetic suspension bearing and a motor, wherein the axial magnetic suspension bearing comprises two iron core components, the two iron core components are arranged in parallel relatively and form an installation gap, a thrust disc connected with a rotor is arranged in the installation gap, a rolling body is arranged in a first end face, facing the thrust disc, of an iron core in the iron core components, and the rolling body is provided with a part protruding out of the first end face. According to the invention, on one hand, the sliding friction between the thrust disc and the iron core can be converted into rolling friction by the rolling body arranged on the first end surface of the iron core when the bearing suspension is unstable or the magnetic suspension system is powered off, so that the damage of the thrust disc is effectively avoided, and the cost is reduced; on the other hand, the axial protection structure of the rotor is integrated on the axial magnetic suspension bearing, so that the axial length of the rotor can be shortened while the structure is simpler, the weight of the rotor is reduced, and the energy consumption of the motor is further reduced.)

1. The utility model provides an axial magnetic suspension bearing, its characterized in that includes two iron core subassemblies, two the relative parallel arrangement of iron core subassembly just forms the installation clearance, be equipped with thrust dish (4) of being connected with rotor (3) in the installation clearance, iron core (1) orientation in the iron core subassembly be equipped with rolling element (5) in the first terminal surface of thrust dish (4), rolling element (5) have protrusion in the part of first terminal surface.

2. Axial magnetic bearing according to claim 1, characterized in that the first end face is formed with a first circular raceway (61), a plurality of rolling bodies (5) are accommodated in the first circular raceway (61), and the cross section of the first circular raceway (61) is a major arc.

3. The axial magnetic suspension bearing according to claim 2, characterized in that the iron core (1) comprises an outer ring body (11) and a coil-embedded ring body (12), the outer ring body (11) is coaxially sleeved on the outer circumferential side of the coil-embedded ring body (12), a first inner ring arc groove is formed on the inner side of one end side wall of the outer ring body (11) corresponding to the first end face, a first outer ring arc groove is formed on the outer side of one end side wall of the coil-embedded ring body (12) corresponding to the first end face, and the first inner ring arc groove and the first outer ring arc groove jointly form the first ring raceway (61).

4. Axial magnetic bearing, according to claim 3, characterized in that said outer ring body (11) comprises at least two outer ring sub-bodies, between which said outer ring body (11) can be assembled in a full circle.

5. The axial magnetic bearing as claimed in claim 3, characterized in that a second circular raceway (62) is formed on the first end face, a plurality of rolling bodies (5) are accommodated in the second circular raceway (62), and the cross section of the second circular raceway (62) is a major arc.

6. The axial magnetic suspension bearing according to claim 5, characterized in that the iron core (1) further comprises an inner ring body (13), the inner ring body (13) is coaxially sleeved on the inner circumferential side of the coil embedded ring body (12), a second inner ring arc groove is formed inside one end side wall of the coil embedded ring body (12) corresponding to the first end face, a second outer ring arc groove is formed outside one end side wall of the inner ring body (13) corresponding to the first end face, and the second inner ring arc groove and the second outer ring arc groove jointly form the second ring raceway (62).

7. Axial magnetic suspension bearing according to claim 6, characterized in that the inner ring body (13) comprises at least two inner ring sub-bodies between which the inner ring body (13) can be assembled in a full circle.

8. Axial magnetic suspension bearing according to claim 6, characterized in that the inner ring wall of the inner ring (13) is formed with a third circular raceway (63), a plurality of rolling elements (5) are accommodated in the third circular raceway (63), and the cross section of the third circular raceway (63) is a major arc.

9. Axial magnetic bearing according to claim 8, characterized in that the inner circumferential wall of the inner ring (13) has a collar (131) extending towards the radial inside thereof and an axial stop ring (132) assembled with the axial end face of the collar (131), the collar (131) is configured with a first end face groove on the side facing the axial stop ring (132), the axial stop ring (132) is configured with a second end face groove on the side facing the collar (131), and the first end face groove and the second end face groove together form the third annular raceway (63).

10. Axial magnetic bearing according to claim 9, characterized in that the outer ring (11), the coil insert ring (12) and the inner ring (13) are bonded together; and/or the axial limiting ring (132) is bonded with the convex ring (131).

11. An electrical machine comprising an axial magnetic bearing as claimed in any one of claims 1 to 10.

Technical Field

The invention belongs to the technical field of magnetic suspension bearing manufacturing, and particularly relates to an axial magnetic suspension bearing and a motor.

Background

The magnetic suspension bearing suspends the rotor in a magnetic field by using controllable electromagnetic force, has the advantages of no contact, no lubrication, no abrasion, long service life, low maintenance cost, no need of lubrication, no need of sealing and the like compared with the common bearing, and can be applied to special environments such as vacuum technology, clean rooms, sterile workshops, transportation of corrosive media or very pure media and the like.

Magnetic suspension can be at high speed, high accuracy operation down, and when the magnetic suspension bearing operation in-process outage suddenly or became invalid, the rotor falls at a high speed and can cause serious damage to rotor and magnetic suspension bearing, so, generally in the magnetic suspension bearing system, all can set up protection device, and it divide into radial protection and axial protection, and radial protection generally adopts ball bearing, and axial protection generally adopts graphite or ball bearing to protect. In the prior art, the axial protection structure is arranged independently of the axial bearing magnetic suspension bearing, so that the length of the rotor is inevitably increased, the weight of the rotor is increased, and the energy consumption of the motor is higher.

Disclosure of Invention

Therefore, the invention provides an axial magnetic suspension bearing and a motor, and can overcome the defects that the rotor length is larger, the weight of the rotor is increased and the energy consumption of the motor is higher due to the fact that an axial protection structure is independent of the axial magnetic suspension bearing in the related technology.

In order to solve the above problems, the present invention provides an axial magnetic suspension bearing, which includes two core assemblies, wherein the two core assemblies are arranged in parallel to each other to form an installation gap, a thrust plate connected to a rotor is disposed in the installation gap, a rolling body is disposed in a first end surface of an iron core of the core assemblies, the first end surface facing the thrust plate, and the rolling body has a portion protruding out of the first end surface.

In some embodiments, the first end face is configured with a first circular raceway, the first circular raceway accommodates a plurality of the rolling elements therein, and the first circular raceway has a section with a major arc.

In some embodiments, the iron core includes an outer ring body and a coil insert ring body, the outer ring body is coaxially sleeved on the outer circumferential side of the coil insert ring body, a first inner ring arc groove is formed on the inner side of one end side wall of the outer ring body corresponding to the first end surface, a first outer ring arc groove is formed on the outer side of one end side wall of the coil insert ring body corresponding to the first end surface, and the first inner ring arc groove and the first outer ring arc groove together form the first circular ring raceway.

In some embodiments, the outer ring body comprises at least two outer ring sub-bodies, and at least two outer ring sub-bodies can be assembled in a full circle to form the outer ring body.

In some embodiments, the first end face is further configured with a second circular raceway, the second circular raceway accommodates a plurality of the rolling elements therein, and the second circular raceway has a section with a major arc.

In some embodiments, the iron core further includes an inner ring body coaxially sleeved on the inner circumferential side of the coil embedded ring body, a second inner ring arc groove is configured on the inner side of the side wall of one end of the coil embedded ring body corresponding to the first end surface, a second outer ring arc groove is configured on the outer side of the side wall of one end of the inner ring body corresponding to the first end surface, and the second inner ring arc groove and the second outer ring arc groove together form the second circular ring raceway.

In some embodiments, the inner ring body comprises at least two inner ring sub-bodies, and at least two of the inner ring sub-bodies can be assembled in a full circle to form the inner ring body.

In some embodiments, a third circular raceway is configured on the inner annular wall of the inner ring, the third circular raceway accommodates a plurality of the rolling elements therein, and the cross section of the third circular raceway is a major arc.

In some embodiments, the inner circumferential wall of the inner ring body has a collar extending toward the radially inner side thereof and an axial stopper ring assembled with an axial end face of the collar, the collar is configured with a first end face groove on a side facing the axial stopper ring, the axial stopper ring is configured with a second end face groove on a side facing the collar, and the first end face groove and the second end face groove together form the third ring raceway.

In some embodiments, the outer ring body, the coil insert ring body, and the inner ring body are bonded together; and/or the axial limiting ring is bonded with the convex ring.

The invention also provides a motor which comprises the axial magnetic suspension bearing.

According to the axial magnetic suspension bearing and the motor, on one hand, sliding friction between the thrust disc and the iron core can be converted into rolling friction through the rolling bodies arranged on the first end face of the iron core when the bearing is unstable in suspension or a magnetic suspension system is powered off, so that the thrust disc is effectively prevented from being damaged, and the cost is reduced; on the other hand, the axial protection structure of the rotor is integrated on the axial magnetic suspension bearing, so that the axial length of the rotor can be shortened while the structure is simpler, the weight of the rotor is reduced, and the energy consumption of the motor is further reduced.

Drawings

FIG. 1 is a schematic diagram (half section) of the internal structure of an axial magnetic suspension bearing according to an embodiment of the present invention;

FIG. 2 is an exploded view of the axial magnetic bearing of FIG. 1;

FIG. 3 is a half-sectional view of a portion of the component of FIG. 1;

fig. 4 is an exploded view of fig. 3.

The reference numerals are represented as:

1. an iron core; 11. an outer ring body; 12. the coil is embedded with the ring body; 13. an inner ring body; 131. a convex ring; 132. an axial spacing ring; 2. a coil; 3. a rotor; 4. a thrust plate; 5. a rolling body; 61. a first circular raceway; 62. a second circular raceway; 63. a third circular raceway; 7. a housing.

Detailed Description

Referring to fig. 1 to 4 in combination, according to an embodiment of the present invention, an axial magnetic suspension bearing is provided, which includes two core assemblies, the two core assemblies are disposed in parallel to each other and form an installation gap, a thrust plate 4 connected to a rotor 3 is disposed in the installation gap, a first end surface of a core 1 of the core assembly facing the thrust plate 4 is provided with rolling bodies 5 (specifically, balls for example), and the rolling bodies 5 have portions protruding from the first end surface. In the technical scheme, on one hand, sliding friction between the thrust disc 4 and the iron core 1 can be converted into rolling friction through the rolling body 5 arranged on the first end surface of the iron core 1 when the bearing suspension is unstable or the magnetic suspension system is powered off, so that the thrust disc 4 is effectively prevented from being damaged, and the cost is reduced; on the other hand, with the axial protection structure integration of rotor 3 in on the axial magnetic suspension bearing, the structure can also be favorable to the shortening of the axial length of rotor 3 (need not to set up the axial protection device alone, occupies rotor length) when simpler, reduces the weight of rotor 3, and then reduces the motor energy consumption.

In some embodiments, the first end face is configured with a first circular raceway 61, the first circular raceway 61 accommodates a plurality of rolling elements 5 therein, and the cross section of the first circular raceway 61 is a major arc, it can be understood that a plurality of rolling elements 5 adjacent to each other in the first circular raceway 61 can roll when the protruding portion of the rolling elements contacts with the rotating thrust disk 4, so that sliding friction is converted into rolling friction, and the wear of the contact parts is effectively reduced. The first circular raceway 61 in the major arc can effectively prevent the rolling elements 5 from falling out of the first circular raceway 61, and the rolling elements 5 can be reliably located in the first circular raceway 61.

In some embodiments, the core 1 is an integrated structure, the first circular raceway 61 is formed on the first end surface thereof, and in this case, in order to ensure that the rolling elements 5 can be smoothly assembled in the first circular raceway 61, corresponding rolling element insertion holes are formed in the first circular raceway 61, and the plurality of rolling elements 5 are sequentially inserted through the rolling element insertion holes and then are closed by a closing member (e.g., a nut) after the insertion is completed.

In some embodiments, the iron core 1 includes an outer ring body 11, a coil-embedded ring body 12 (for winding the coil 2), the outer ring body 11 is coaxially sleeved on the outer circumference side of the coil-embedded ring body 12, a first inner ring arc groove is formed inside one end side wall of the outer ring body 11 corresponding to the first end surface, a first outer ring arc groove is formed outside one end side wall of the coil-embedded ring body 12 corresponding to the first end surface, the first inner ring arc groove and the first outer ring arc groove together form the first circular ring raceway 61, at this time, the rolling body 5 can be embedded in a manner of using the aforementioned rolling body embedding hole, and as another preferred implementation manner, the outer ring body 11 includes at least two sub-bodies, at least two of the sub-bodies can be integrally assembled between the outer ring to form the outer ring body 11, and the split outer ring body 11 facilitates the assembly of the rolling body 5, it is only necessary to sequentially place a predetermined number of the rolling elements 5 in the first outer ring arc groove or the first inner ring arc groove in advance, and then assemble at least two outer ring sub-bodies to the outer circumferential wall of the coil insert ring body 12. It can be understood that the axial magnetic suspension bearing has a housing 7, the two axial ends of the housing 7 are respectively provided with a core mounting hole, and at least two outer ring sub-bodies of the outer ring body 11 are reliably assembled through the hole walls of the core mounting holes.

In some embodiments, a second circular raceway 62 is further configured on the first end surface, the second circular raceway 62 accommodates a plurality of rolling elements 5 therein, and a cross section of the second circular raceway 62 is a major arc, and the second circular raceway 62 is preferably arranged coaxially with the first circular raceway 61, and forms an axial protection for the axial magnetic suspension bearing together with the first circular raceway 61.

Similar to the structure of the first circular raceway 61, the iron core 1 further includes an inner ring 13, the inner ring 13 is coaxially sleeved on the inner circumferential side of the coil embedded ring 12, a second inner circular arc groove is formed on the inner side of the side wall of the coil embedded ring 12 corresponding to the first end surface, a second outer circular arc groove is formed on the outer side of the side wall of the inner ring 13 corresponding to the first end surface, and the second inner circular arc groove and the second outer circular arc groove together form the second circular raceway 62. Further, the inner ring body 13 includes at least two inner ring sub-bodies, and the at least two inner ring sub-bodies can be assembled in a full circle to form the inner ring body 13.

In some embodiments, a third circular track 63 is formed on the inner annular wall of the inner ring 13, the third circular track 63 accommodates a plurality of rolling elements 5 therein, and the cross section of the third circular track 63 is a major arc, it can be understood that the third circular track 63 has an opening facing the radial direction of the rotor 3, and the rolling elements 5 can form a radial protection for the axial magnetic suspension bearing. In some embodiments, the inner circumferential wall of the inner ring 13 has a protruding ring 131 extending toward the radial inner side thereof and an axial limiting ring 132 assembled with the axial end face of the protruding ring 131, the protruding ring 131 is configured with a first end face groove toward the axial limiting ring 132 side, the axial limiting ring 132 is configured with a second end face groove toward the protruding ring 131 side, and the first end face groove and the second end face groove together form the third annular raceway 63.

In some embodiments, the outer ring body 11, the coil insert ring body 12, and the inner ring body 13 are bonded to each other; and/or, the axial limiting ring 132 is bonded with the convex ring 131 to facilitate assembly, and of course, screws, bolts, pin joints, interference fit thermal assembly, welding and other modes can also be adopted. The thrust disc 4 and the rotor 3 can be connected by adopting a screw, a bolt, a pin, an interference fit thermal assembly, welding, adhesive coating and the like.

According to an embodiment of the present invention, there is also provided an electric machine including the axial magnetic bearing described above.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.