CN210985915U

CN210985915U - Fractional-slot high-temperature superconducting generator stator

Info

Publication number: CN210985915U
Application number: CN201921780624.4U
Authority: CN
Inventors: 李婉; 李东升; 陈琳; 杨智; 张洋; 陈磊
Original assignee: 704th Research Institute of CSIC
Current assignee: 704th Research Institute of CSIC
Priority date: 2019-10-22
Filing date: 2019-10-22
Publication date: 2020-07-10
Anticipated expiration: 2029-10-22

Abstract

The utility model relates to a fractional-slot high-temperature superconducting generator stator, which is provided with a superconducting motor stator core device, wherein the superconducting motor stator core device consists of a superconducting wire coil, a stator core and a baffle plate; the superconducting wire coil adopts a high-temperature superconducting coil as an armature winding, so that the current-carrying density of the armature winding at the stator side can be improved, the power density of the whole machine is improved, and the weight is reduced. The wire coil is integrally designed to effectively fix and support the high-temperature superconducting coil, and the upper cover plate and the lower cover plate are made of screws and nuts made of nylon and glass fiber materials, so that the purpose of reducing eddy current loss of the integral coil is achieved; the design of the polygonal notch is favorable for the installation and the disassembly of the whole wire coil, the magnetic gathering effect of the iron core can be weakened through the linearization or filleting treatment of the sharp corner, the surface magnetic field of the superconducting coil is reduced, the working environment of the superconducting coil is improved, and the critical current of the superconducting coil is increased.

Description

Fractional-slot high-temperature superconducting generator stator

Technical Field

The utility model relates to a high temperature superconducting motor, concretely relates to adopt superconducting coil's armature winding's stator.

Background

The high-temperature superconducting motor adopts a high-temperature superconductor and a high-temperature superconducting armature winding, wherein:

(1) compared with conventional conductors, high-temperature superconductors have two basic characteristics, namely: zero resistance characteristic and the meissner effect. The superconducting material is resistive in a normal state and belongs to a normal state; when the superconducting material is cooled below a certain temperature, the resistance is zero, the superconductivity is shown, and the superconductor is in a superconducting state. High temperature superconducting materials were produced in 1986, and with the discovery of high temperature copper oxide superconductors, the introduction of the "high temperature superconductor" study, which can operate above the liquid nitrogen temperature range, was uncovered. Compared with a low-temperature superconductor (the critical temperature is below 10K), the critical temperature of the high-temperature superconductor is greatly improved, and the requirement on refrigeration is greatly reduced; meanwhile, the preparation process of the superconducting tape is developed gradually after more than 30 years, the electromagnetic property and the mechanical property of the superconducting tape are obviously improved, the price is also reduced year by year, and the industrial mass production of the superconducting tape enables the superconducting coil, the superconducting permanent magnet and the superconducting cable to be used on a series of power equipment to be feasible. Compared with the traditional conventional conductor power equipment, the superconducting power equipment has the advantages of large current carrying, low loss, high efficiency, small volume and low cost.

(2) The high-temperature superconducting wire in the high-temperature superconducting armature winding has the advantages of high current carrying and small section, so that a coil wound by the high-temperature superconducting wire is used for the armature winding of the motor, the current carrying density can be greatly improved, the load of an armature wire is increased, the power density of the motor is improved, the mass volume of the motor is reduced, and the efficiency density is improved. The shape and performance design of the superconducting coil is the most important part of the whole superconducting motor.

(3) The superconducting coil has alternating current loss, and the high-temperature superconducting material has almost no loss under direct current, but under the influence of alternating current or an alternating current magnetic field, the superconducting coil generates alternating current loss, and the loss is the intrinsic property of the material and cannot be avoided. Therefore, the application of the superconducting coil in an alternating current environment is greatly limited; at 77K or even lower temperatures, it takes ten or even one hundred times as much cold input to carry away 1J of heat.

Because the superconducting wire is different from a common copper wire, the structure of the superconducting wire is easy and brittle, the superconducting wire cannot be bent at will and cannot be directly and tightly wound on iron teeth of a stator core like a copper wire, and a superconducting coil needs to be wound on a customized framework and is fixed with the stator core through the framework. Improper framework design can reduce the slot fullness rate of the iron core, which leads to serious magnetic leakage of the iron core of the motor, thereby increasing the alternating current loss of the superconducting armature winding and increasing the integral cooling burden of the motor. Whole superconducting coil includes skeleton and stator core's fixed, rational design superconducting wire coil is the utility model discloses well problem that needs the solution guarantees that whole device can both work safely in the liquid nitrogen environment.

Under the condition of meeting the requirement of the slot filling rate of the stator core, how to reduce the surface magnetic field of the superconducting coil and improve the integral operation environment of the coil. The critical current of the superconducting wire is influenced by an external magnetic field on the surface of the superconducting wire. A reduction in the critical current means that the ac losses increase under the same conditions of throughflow. The magnetic field on the surface of the coil is reduced through the external structure change of the whole device, so that the critical current of the coil is improved.

Disclosure of Invention

The utility model aims to provide a high temperature superconducting generator stator of fractional slot, the superconducting coil simple structure of this stator can make things convenient for and firmly fix superconducting coil and stator core.

The technical scheme of the utility model is that: a high-temperature superconducting generator stator with fractional slots is provided with a superconducting motor stator core device, wherein the superconducting motor stator core device consists of a superconducting wire coil, a stator core and a baffle plate, open slots and parallel teeth which are uniformly distributed are formed in the stator core, the superconducting wire coil is arranged in the open slots, and the superconducting wire coil is fixedly connected with the stator core through the baffle plate; the superconducting wire coil adopts the high-temperature superconducting coil as the armature winding, so that the current-carrying density of the armature winding at the stator side can be improved, the power density of the whole machine is improved, and the weight of the whole machine is reduced.

Furthermore, the superconducting wire coil consists of a superconducting coil, an integral framework and a copper terminal, wherein the superconducting coil is wound into a runway shape on the integral framework; the track type framework is fixedly connected with the upper cover plate and the lower cover plate into a whole through a plurality of flat machine screws, screws and nuts, and meanwhile, two sides of the upper cover plate are bent downwards to prevent the wound coils from being scattered; and the two copper terminals are respectively fixed on the lower cover plate and are used for connecting the cable lead and the superconducting coil.

Furthermore, flat-bed machine screw dislocation in upper and lower apron is screwed up, guarantees to flush the same with the upper cover plate after last screw and nut that tighten, improves stator core's polygon open slot's utilization ratio.

Furthermore, the two copper terminal structures are inconsistent and the fixed positions on the lower cover plate are asymmetric, so that the insulating abrasion and short circuit fault caused by the mutual crossing of the cable and the wire are avoided.

Furthermore, the flat machine screws, the screws and the nuts are made of nylon and glass fiber composite materials, the content of the nylon and the content of the glass fiber composite materials respectively account for 50%, eddy current loss around the wire coil can be reduced, and the overall compressive resistance of the superconducting wire coil is improved.

Furthermore, the stator core adopts a polygonal open slot and parallel teeth structure, and the polygonal open slot and the parallel teeth are distributed at intervals.

Furthermore, the sharp angle at the top of the polygonal open slot of the stator core is subjected to linearization treatment, so that the magnetic concentration effect can be effectively reduced, the magnetic field on the surface of the coil is weakened, and the critical current of the superconducting coil is improved.

The utility model has the advantages that:

compared with a common generator copper wire armature winding, the high-temperature superconducting coil is adopted as the armature winding, so that the current-carrying density of the stator side armature winding can be improved, the power density of the whole generator is greatly improved, and the overall weight is reduced. For the motor with low rotating speed and high power, the operation efficiency can be improved.

The whole design of the wire coil can effectively fix and support the high-temperature superconducting coil, and the upper cover plate and the lower cover plate of the wire coil are both made of screws and nuts made of nylon and glass fiber materials, so that the purpose of reducing eddy current loss of the whole coil is achieved.

The design of the polygonal notch is favorable for the installation and the disassembly of the whole wire coil, the magnetic gathering effect of the iron core can be weakened through the linearization or filleting treatment of the sharp corner, the surface magnetic field of the superconducting coil is reduced, the working environment of the superconducting coil is improved, and the critical current of the superconducting coil is increased.

Drawings

FIG. 1 is a schematic diagram of a fractional-slot high temperature superconducting generator stator core;

FIG. 2 is a schematic view of a superconducting wire coil;

fig. 3 is a front view of the stator core.

Detailed Description

The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, so as to facilitate clear understanding of the present invention, but they do not limit the present invention.

As shown in fig. 1, a fractional-slot high-temperature superconducting generator stator has a superconducting motor stator core device, which mainly comprises a superconducting wire coil 1, a stator core 2 and a baffle 3. The stator core 2 is provided with a polygonal open slot and a parallel tooth structure which are uniformly distributed, a superconducting wire coil 1 is arranged in the polygonal open slot, and the superconducting wire coil 1 is fixedly connected with the stator core 2 through a baffle 3. The design of the polygonal notch is favorable for mounting and dismounting the whole wire coil, the magnetic gathering effect of the iron core can be weakened through linearization or filleting treatment at the sharp corner, the surface magnetic field of the superconducting coil is reduced, the working environment of the superconducting coil is improved, and the critical current of the superconducting coil is increased.

The superconducting wire coil 1 adopts a high-temperature superconducting coil as an armature winding, so that the current-carrying density of the armature winding at the stator side can be improved, the power density of the whole machine is greatly improved, and the weight of the whole machine is reduced. For the motor with low rotating speed and high power, the operation efficiency can be improved.

As shown in fig. 2, the superconducting wire coil 1 is mainly composed of a superconducting coil 1-1, an integral former 1-2 and a copper terminal 1-3. Because the high-temperature superconducting wire is of a flat structure, has a large width-thickness ratio and cannot be bent in a direction parallel to the surface of a lead, the superconducting coil used in the motor can only be wound into a runway type. The integral framework 1-2 comprises an upper cover plate 1-2-1, a lower cover plate 1-2-2 and a runway-type framework 1-2-3, wherein the upper cover plate and the lower cover plate are provided with 28M 3 flat machine screws 1-2-4 and 4M 10 screws 1-2-5 and nuts 1-2-6. Meanwhile, the two sides of the upper cover plate 1-2-1 are bent downwards to prevent the wound coil from being scattered. The flat machine screws 1-2-4 in the upper cover plate 1-2-1 and the lower cover plate 1-2-2 are tightened in a staggered mode, the tightening screws 1-2-5 are guaranteed to be flush with the upper cover plate 1-2-1, and the utilization rate of the stator iron core 2 slot is improved. 4M 10 threaded holes are used for connecting the superconducting wire coil 1 and the stator core 2. The superconducting wire is brittle and cannot be directly used as an output lead; the copper terminal 1-3 is fixed on the lower cover plate 1-2-2 and used for connecting a cable wire and the superconducting coil 1-1. The two copper terminals 1-3 are inconsistent in structure and asymmetric in placement position, so that the insulating abrasion caused by the fact that the cable wires are crossed with each other is avoided, and short circuit faults occur. In order to reduce eddy current loss around the wire coil and improve the overall compressive resistance of the superconducting wire coil 1, 50% of flat machine screws 1-2-4, M10 screws 1-2-5 and nuts 1-2-6 which are made of nylon and glass fiber composite materials are adopted.

The utility model discloses well superconducting wire coiling forms superconducting coil 1-1 on runway type skeleton, utilizes upper cover plate 1-2-1 and lower cover plate 1-2-2 as fixed stay. Meanwhile, the two sides of the upper cover plate 1-2-1 are bent downwards to prevent the wound coil from being scattered. The utility model discloses in total 12 baffles 3 for the fixed and support of drum and iron core.

As shown in fig. 3, the front view of the stator core 2 is different from the conventional trough-shaped structures such as pear-shaped trough and rectangular trough of the conventional generator, and the stator core 2 of the present invention adopts the structural design of polygonal open slot 2-1 and parallel teeth 2-2. The stator iron core 2 is designed into parallel slots, which is beneficial to the direct installation, disassembly and maintenance of the superconducting wire coil 1; the tooth grooves are designed to be polygonal, so that the top surface, the side surface and the notch of the wire coil are parallel, the grooving area is reduced as much as possible, and the groove utilization rate is improved. Because the sharp corner of the stator core 2 has the magnetic gathering effect, and the processing difficulty is considered, the highest sharp corner is subjected to linearization treatment 2-3, the magnetic gathering effect can be effectively reduced, the magnetic field on the surface of the coil is weakened, and the critical current of the superconducting coil is improved. The surface of the stator core is provided with 12 round holes 2-4 for connecting the baffle 3 and the stator core.

Claims

1. A fractional-slot high-temperature superconducting generator stator having a superconducting motor stator core assembly, characterized by: the superconducting motor stator core device comprises a superconducting wire coil, a stator core and a baffle plate, wherein the stator core is provided with open slots and parallel teeth which are uniformly distributed, the superconducting wire coil is arranged in the open slots, and the superconducting wire coil is fixedly connected with the stator core through the baffle plate; the superconducting wire coil adopts the high-temperature superconducting coil as the armature winding, so that the current-carrying density of the armature winding at the stator side can be improved, the power density of the whole machine is improved, and the weight of the whole machine is reduced.

2. The fractional-slot high temperature superconducting generator stator of claim 1, wherein: the superconducting wire coil is composed of a superconducting coil, an integral framework and a copper terminal, and the superconducting coil is wound into a runway shape on the integral framework; the track type framework is fixedly connected with the upper cover plate and the lower cover plate into a whole through a plurality of flat machine screws, screws and nuts, and meanwhile, two sides of the upper cover plate are bent downwards to prevent the wound coils from being scattered; and the two copper terminals are respectively fixed on the lower cover plate and are used for connecting the cable lead and the superconducting coil.

3. The fractional-slot high temperature superconducting generator stator of claim 2, wherein: the flat-bed machine screws in the upper cover plate and the lower cover plate are tightened in a staggered mode, the flat-bed machine screws are flush with the upper cover plate after the screws and nuts are tightened, and the utilization rate of the polygonal open slot of the stator core is improved.

4. The fractional-slot high temperature superconducting generator stator of claim 2, wherein: the two copper terminal structures are inconsistent, and the fixed positions of the two copper terminal structures on the lower cover plate are asymmetric, so that the insulation abrasion and short circuit fault caused by the mutual crossing of the cable wires are avoided.

5. The fractional-slot high temperature superconducting generator stator of claim 2, wherein: the flat machine screw, the screw and the nut are made of nylon and glass fiber composite materials, the content of the nylon and the glass fiber composite materials respectively accounts for 50%, eddy current loss around the wire coil can be reduced, and the overall compressive resistance of the superconducting wire coil is improved.

6. The fractional-slot high temperature superconducting generator stator of claim 1, wherein: the stator core adopts polygon open slot and parallel tooth structure, and polygon open slot and parallel tooth are interval distribution.

7. The fractional-slot high temperature superconducting generator stator of claim 6, wherein: the sharp angle at the top of the polygonal open slot of the stator core is subjected to linearization treatment, so that the magnetic gathering effect can be effectively reduced, the magnetic field on the surface of the coil is weakened, and the critical current of the superconducting coil is improved.