阅读说明：本技术 一种超导电机转子结构及其装配方法 (Superconducting motor rotor structure and assembling method thereof ) 是由 史正军 宋萌 梅桂华 段新辉 赵兵 李力 夏亚君 于 2021-08-26 设计创作，主要内容包括：本申请公开了一种超导电机转子结构及其装配方法,包括：转子本体；转子本体包括转子主骨架和设置在转子主骨架外侧的超导磁体；超导磁体通过套环固定在转子主骨架上,且套环与超导磁体过盈配合。本发明通过利用套环来承受超导磁体的离心力,使螺栓仅起定位作用,有效提高了转子结构的可靠性。(The application discloses a superconducting motor rotor structure and an assembling method thereof, wherein the assembling method comprises the following steps: a rotor body; the rotor body comprises a rotor main framework and a superconducting magnet arranged on the outer side of the rotor main framework; the superconducting magnet is fixed on the rotor main framework through a lantern ring, and the lantern ring is in interference fit with the superconducting magnet. According to the invention, the lantern ring is used for bearing the centrifugal force of the superconducting magnet, so that the bolt only plays a positioning role, and the reliability of the rotor structure is effectively improved.)

1. A superconducting electrical machine rotor structure, comprising: a rotor body;

the rotor body comprises a rotor main framework and a superconducting magnet arranged on the outer side of the rotor main framework;

the superconducting magnet is fixed on the rotor main framework through a lantern ring, and the lantern ring is in interference fit with the superconducting magnet.

2. The superconducting electrical machine rotor structure according to claim 1, wherein a gap for mounting a slot wedge is left between the collar and the superconducting magnet;

the lantern ring is in interference fit with the superconducting magnet through the slot wedge.

3. The superconducting motor rotor structure of claim 2, wherein the slot wedge is plural in number.

4. The superconducting electrical machine rotor structure of claim 2, wherein the number of the collars is plural;

the lantern rings are sequentially sleeved on the rotor body along the axial direction and are fixedly connected with the superconducting magnet through the slot wedges respectively;

the lantern ring is axially provided with a mounting hole for connecting the lantern rings together;

the lantern rings are connected through the pull rod.

5. The superconducting electrical machine rotor structure of claim 4 wherein a total length of the plurality of collars is equal to a length of the rotor body.

6. The superconducting motor rotor structure of claim 2, wherein the collar is radially provided with a jackscrew hole for fixing the slot wedge.

7. The superconducting motor rotor structure of claim 1, wherein the collar has magnet positioning holes radially formed therein.

8. The superconducting motor rotor structure according to claim 1, wherein a boss for connection with the superconducting magnet is provided on the rotor skeleton;

and the superconducting magnet is correspondingly provided with a clamping groove matched with the boss.

9. The superconducting electrical machine rotor structure of claim 1, wherein the superconducting magnet is comprised of a plurality of superconducting coils, a support structure, and a cryogenic structure.

10. A method of assembling a rotor structure of a superconducting electrical machine according to any one of claims 1-9, the method comprising:

step 1: assembling a superconducting magnet on a rotor main framework to form a rotor body;

step 2: sleeving a first lantern ring on the rotor body, and embedding a slot wedge into a gap between the lantern ring and the superconducting magnet to realize the tight contact between the lantern ring and the superconducting magnet, so that the superconducting magnet is tightly pressed on the rotor main frame;

and step 3: and penetrating a pull rod into a mounting hole of the first lantern ring, then sequentially penetrating the rest lantern rings into the pull rod, fixing the pull rod on the superconducting magnet through slot wedges respectively, and finally screwing two ends of the pull rod through bolts.

Technical Field

The application relates to the technical field of superconducting motors, in particular to a superconducting motor rotor structure and an assembling method thereof.

Background

The superconducting motor is a motor which replaces a stator or a rotor copper coil of a conventional motor with a superconducting coil, and has the advantages of high power density, high operation efficiency, small synchronous reactance and the like. Superconducting machines are generally composed of a rotor, a stator, a base, etc. (as shown in fig. 10), and both the rotor field winding and the stator armature winding can be made of superconducting materials. For a superconducting motor with a rotor excitation winding made of superconducting materials, a rotor superconducting coil, a support structure and a cryogenic structure jointly form a superconducting magnet, and the superconducting magnet is cooled by a cryogenic system and maintained in a cryogenic environment (generally below 77K).

The rotating speed of the rotor of the synchronous motor is related to the number of pole pairs of the rotor, the synchronous rotating speed of the rotor reaches 3000rpm under the condition of 1 pole pair, and the rotating speed is 1500rpm under the condition of 2 pole pair. Because the rotor of the superconducting motor is in a high-speed rotation state, the superconducting magnet bears a large centrifugal force and needs to be reliably fixed on the rotor main framework.

The traditional solution is through the bolt with the superconducting magnet fastening on rotor main skeleton, nevertheless because the bolt bears huge centrifugal force, considers the long-term operation of rotor and vibration, the bolt has not hard up risk, the bolt in case not hard up will be in the vacuum seal state with the skeleton separation under centrifugal force effect, striking rotor inner structure, and whole electric motor rotor all is in, is unfavorable for very much disassembling and checking, consequently adopts bolted connection to have great potential safety hazard. Therefore, the invention provides a rotor structure of a superconducting motor and an assembling method thereof.

Disclosure of Invention

The embodiment of the application provides a rotor structure of a superconducting motor and an assembling method thereof, so that the reliability of the rotor structure is effectively improved.

The present application provides in a first aspect a superconducting electrical machine rotor structure comprising: a rotor body;

the rotor body comprises a rotor main framework and a superconducting magnet arranged on the outer side of the rotor main framework;

the superconducting magnet is fixed on the rotor main framework through a lantern ring, and the lantern ring is in interference fit with the superconducting magnet.

Optionally, a gap for installing a slot wedge is reserved between the lantern ring and the superconducting magnet;

the lantern ring is in interference fit with the superconducting magnet through the slot wedge.

Optionally, the number of the slot wedges is plural.

Optionally, the number of said collars is plural;

the lantern rings are sequentially sleeved on the rotor body along the axial direction and are fixedly connected with the superconducting magnet through the slot wedges respectively;

the lantern ring is axially provided with a mounting hole for connecting the lantern rings together;

the lantern rings are connected through the pull rod.

Optionally, the total length of the plurality of collars is equal to the length of the rotor body.

Optionally, the lantern ring is radially provided with a jackscrew hole for fixing the slot wedge.

Optionally, the collar is radially provided with a magnet positioning hole.

Optionally, a boss for connecting with the superconducting magnet is arranged on the rotor main skeleton;

and the superconducting magnet is correspondingly provided with a clamping groove matched with the boss.

Optionally, the superconducting magnet is comprised of a plurality of superconducting coils, a support structure, and a cryogenic structure.

The second aspect of the present application provides an assembling method based on the above-mentioned superconducting motor rotor structure, which includes:

step 1: assembling a superconducting magnet on a rotor main framework to form a rotor body;

step 2: sleeving a first lantern ring on the rotor body, and embedding a slot wedge into a gap between the lantern ring and the superconducting magnet to realize the tight contact between the lantern ring and the superconducting magnet, so that the superconducting magnet is tightly pressed on the rotor main frame;

and step 3: and penetrating a pull rod into a mounting hole of the first lantern ring, then sequentially penetrating the rest lantern rings into the pull rod, fixing the pull rod on the superconducting magnet through slot wedges respectively, and finally screwing two ends of the pull rod through bolts.

According to the technical scheme, the embodiment of the application has the following advantages: the rotor structure of the superconducting motor comprises a rotor body, wherein the rotor body comprises a rotor main framework and a superconducting magnet arranged on the outer side of the rotor main framework, the superconducting magnet is fixed on the rotor main framework through a lantern ring, and the lantern ring is in interference fit with the superconducting magnet. The superconducting magnet is fixed on the rotor main framework by the lantern ring, the lantern ring can bear the huge centrifugal force of the superconducting magnet, and the annular structure of the lantern ring has good tensile property, so that the mechanical strength of the rotor structure can be effectively improved, and the reliability of the rotor structure is improved.

Drawings

FIG. 1 is a schematic structural view of a rotor structure of a superconducting motor according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a rotor skeleton according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a superconducting magnet in an embodiment of the present application;

fig. 4 is a side view of a superconducting magnet in an embodiment of the present application;

fig. 5 is a schematic view of the installation of the superconducting magnet and the rotor skeleton in the embodiment of the present application;

FIG. 6 is a schematic structural diagram of a collar in an embodiment of the present application;

FIG. 7 is a top view of a collar in an embodiment of the present application;

FIG. 8 is a schematic view of the installation of the collar and the wedge in the embodiment of the present application;

FIG. 9 is a schematic view of the collar and tie rod assembly of the present application;

fig. 10 is a schematic view showing a structure of a superconducting motor in the related art;

wherein the reference numerals are:

1-rotor main framework, 2-superconducting magnet, 3-lantern ring, 4-slot wedge, 5-pull rod, 31-mounting hole, 32-jackscrew hole and 33-magnet positioning hole.

Detailed Description

In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The present application provides an embodiment of a rotor structure of a superconducting electrical machine, and particularly refers to fig. 1.

The rotor structure of the superconducting motor in the embodiment includes: the rotor comprises a rotor body, wherein the rotor body comprises a rotor main framework 1 and a superconducting magnet 2 arranged on the outer side of the rotor main framework 1, the superconducting magnet 2 is fixed on the rotor main framework 1 through a lantern ring 3, and the lantern ring 3 is in interference fit with the superconducting magnet 2.

It should be noted that: by adopting the lantern ring 3 to fix the superconducting magnet 2 on the rotor main framework 1 instead of adopting bolt connection, the lantern ring 3 can bear the huge centrifugal force of the superconducting magnet 2, and the annular structure of the lantern ring 3 has good tensile property, so that the mechanical strength of the rotor structure can be effectively improved, and the reliability of the rotor structure is further improved.

The above is a first embodiment of a rotor structure of a superconducting motor provided in the present application, and the following is a second embodiment of a rotor structure of a superconducting motor provided in the present application, specifically referring to fig. 1 to 9.

The rotor structure of the superconducting motor in the embodiment includes: the rotor comprises a rotor body and a rotor body, wherein the rotor body comprises a rotor main framework 1 and a superconducting magnet 2 arranged on the outer side of the rotor main framework 1, the rotor main framework 1 can be processed into a long strip-shaped structure (as shown in figure 2) by stainless steel materials, and the rotor main framework is also a rotor main shaft and mainly used for fixing the superconducting magnet 2, bearing the weight of a rotor, transmitting electromagnetic torque and the like; the superconducting magnet 2 is fixed on the rotor main framework 1 through a lantern ring 3, and the lantern ring 3 is in interference fit with the superconducting magnet 2.

In the present embodiment, as shown in fig. 6 and 7, the collar 3 is made of stainless steel and has a circular ring structure with a circular outer cross section and an inner surface similar to the outer surface of the superconducting magnet 2.

A gap for installing the slot wedge 4 is reserved between the lantern ring 3 and the superconducting magnet 2, the lantern ring 3 is in interference fit with the superconducting magnet 2 through the slot wedge 4, namely the slot wedge 4 is hammered into the gap between the lantern ring 3 and the superconducting magnet 2 through a mallet, so that the lantern ring 3 is in close contact with the superconducting magnet 2, and the superconducting magnet 2 is tightly pressed on the rotor main framework 1. The slot wedge 4 can be formed by stainless steel material processing, and the main function is the space of filling between rotor skeleton 1 and the superconducting magnet 2 to make the two in close contact with, prevent that superconducting magnet 2 from rocking on rotor skeleton 1, install more convenient through adopting slot wedge 4.

It can be understood that the lantern ring 3 and the superconducting magnet 2 can also be installed by a temperature difference assembly method, namely, the superconducting magnet 2 and the rotor main framework 1 are soaked in liquid nitrogen for a period of time, and the lantern ring 3 is installed after the superconducting magnet 2 and the rotor main framework 1 are precooled and shrunk.

Specifically, the number of the slot wedges 4 can be multiple, so that the installation is more convenient, and the connecting effect is better. In the present embodiment, as shown in fig. 8, the wedges 4 are divided into 4 groups of 6, and the 6 wedges 4 in each group are different in shape.

The number of the lantern rings 3 is multiple, the lantern rings 3 are sequentially sleeved on the rotor body along the axial direction and are fixedly connected with the superconducting magnet 2 through the slot wedges 4 respectively, and the installation is more convenient; as shown in fig. 7 and 9, the lantern ring 3 is axially provided with a mounting hole 31 for connecting the lantern rings 3 together, and the lantern rings 3 are connected through the pull rod 5, so that the disassembly is convenient. The plurality of collars 3 are connected together in the axial direction by the tie rods 5, so that the plurality of collars 3 form a whole, preventing the risk of separation of the respective collars 3 in the event of rotation. Specifically, the number of mounting holes 31 can be a plurality of, and the quantity of pull rod 5 equals the number of mounting holes 31, and the one-to-one correspondence, through adopting a plurality of pull rods 5 to cooperate to connect, it is more firm to fix.

It can be understood that: because the slot wedge 4 need fill up the space between the lantern ring 3 and the superconducting magnet 2, need polish on the spot according to the size in space to try repeatedly, just can guarantee the dynamics that compresses tightly, consequently install one by one through a plurality of lantern rings 3, can make the installation of slot wedge 4 more accurate, and then better compress tightly superconducting magnet 2.

The total length of the plurality of collars 3 is equal to the length of the rotor body, and the number of collars 3 can be divided according to the length of the rotor body and the installation requirement.

As shown in fig. 6, the collar 3 is radially provided with a jackscrew hole 32 for fixing the slot wedge 4, and the fixation of the slot wedge 4 can be reinforced by the jackscrew, thereby further improving the overall mechanical strength. Magnet positioning holes 33 are radially formed in the lantern ring 3, and the superconducting magnet 2 on the inner side of the lantern ring 3 can be fixed through positioning bolts, so that the mechanical strength of the rotor structure is further improved.

It will be appreciated that after the jackscrew and the positioning bolt are installed, a loosening process may be performed using glue, i.e., glue is injected into the gap between the jackscrew and the jackscrew hole 32 and the gap between the positioning bolt and the magnet positioning hole 33 to make the connection tighter. Specifically, Stycast 2850 glue can be used as the glue.

As shown in fig. 2, a boss for connecting with the superconducting magnet 2 is provided on the rotor main frame 1, and as shown in fig. 3, a slot matching with the boss is correspondingly provided on the superconducting magnet 2. In this embodiment, the rotor has a 2-pole structure, so that each of the upper and lower parts of the rotor main frame 1 has a boss, and 2 superconducting magnets 2 can be respectively sleeved in the bosses.

As shown in fig. 3 and 4, the superconducting magnet 2 is composed of a plurality of superconducting coils, a support structure, and a cryogenic structure. Specifically, the superconducting coils are wound by superconducting tapes and are subjected to curing treatment, a plurality of superconducting coils are arranged in a vertically stacked manner, the height and the length of each superconducting coil are the same, the number of turns and the width of each superconducting coil are different, and the central holes are in the same straight line, so that the side surfaces of the superconducting coils are in a step shape; the supporting structure comprises a coil framework, a cover plate, a blank holder and the like, which are all made of stainless steel materials; the low-temperature structure mainly refers to a cold guide plate and a refrigerant pipeline which are embedded between superconducting coils.

The application also provides an assembling method based on the rotor structure of the superconducting motor, which comprises the following steps:

step 1: as shown in fig. 5, two superconducting magnets 2 are respectively attached to bosses of the rotor skeleton 1 to constitute a rotor body. If the superconducting magnet 2 cannot be sleeved on the boss of the rotor main framework 1, a mallet can be used for knocking in or grinding the installation position, and the superconducting magnet 2 can be fixed by using screws after the installation is in place.

Step 2: as shown in fig. 1, a first lantern ring 3 is sleeved on a rotor body, and a mallet is used for embedding a slot wedge 4 into a gap between the lantern ring 3 and a superconducting magnet 2, so that the lantern ring 3 is in close contact with the superconducting magnet 2, and the superconducting magnet 2 is tightly pressed on a rotor main framework 1; then, the slot wedge 4 and the superconducting magnet 2 are fixed by the aid of the jackscrew holes 32 and the magnet positioning holes 33 on the outer side of the lantern ring 3, and after the jackscrews and the positioning bolts are installed, Stycast 2850 glue can be used for anti-loosening treatment, so that safety is better.

And step 3: and (3) penetrating the pull rod 5 into the mounting hole 31 of the first lantern ring 3, then sequentially penetrating the other lantern rings 3 into the pull rod 5, sequentially fixing the pull rod on the rotor body according to the method in the step (2), and finally screwing the two ends of the pull rod 5 through bolts.

It should be noted that: the positioning bolts and the jackscrews on the lantern ring 3 only bear the centrifugal force of the positioning bolts and the jackscrews, and the bolts at the two ends of the pull rod 5 are in the axial direction and are not easy to loosen.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.