CN211557124U - Stator for disk type full superconducting motor and cooling structure thereof - Google Patents

Abstract

The utility model discloses a stator for full superconducting motor of disk and cooling structure thereof, it is first that be equipped with a set of correspondence setting in the casing, second stator locating plate, it is first, be equipped with first stator cooling path between the second stator locating plate in proper order, the centralized runway winding of stator and second stator cooling path, be provided with the excitation iron core array between the centralized runway winding of stator and the second stator cooling path, the structure of the centralized runway winding of stator sets up with the structure cooperation of excitation iron core array, through first between the structure of the centralized runway winding of stator and the structure of excitation iron core array, second stator locating plate is fixed. When the motor is used, the design of the stator magnetic yoke is cancelled, so that the motor with the structure has great advantages in the aspects of power density and torque density.

Description

Stator for disk type full superconducting motor and cooling structure thereof

Technical Field

The utility model relates to a disc motor's technical field, in particular to a stator and cooling structure for full superconducting motor of disc especially relate to a stator and cooling structure of runway type coil with superconductive strip coils and makes, and this kind of stator and cooling structure are applied to in the full superconducting motor of disc stator-rotor.

Background

At present, the design of a mainstream driving motor is developed towards the trend of high density, the power density is also increased year by year, and a drum type motor with higher power density is more and more difficult to meet the development requirement of high density.

The magnetic circuit structure of the traditional permanent magnet disc type motor is as follows: the magnetic induction line is emitted from N-pole magnetic steel of the surface-mounted rotor, penetrates through a stator excitation iron core through an air gap, the magnetic circuit rotates at a stator yoke part, and returns to the S pole of the adjacent magnetic steel of the rotor after passing through the air gap through the excitation iron core of the adjacent stator tooth part after being turned over.

The conventional superconducting motors are all in a conventional barrel type configuration, the configuration of the superconducting motor is far from the development trend of the motor, and the power density and the torque density of the superconducting motor are often difficult to be improved due to the low density of a system of the superconducting motor.

Disclosure of Invention

The utility model provides a to above-mentioned problem, provide a stator for full superconducting motor of disk and cooling structure thereof, eliminated the design of stator excitation iron core yoke portion, can be so that the stator magnetic field does not have the rotation change along the axial, adopt the structure of the centralized runway winding of stator and the mode that the excitation iron core array structure combines simultaneously for the magnetic field that the stator produced is more even, promotes and reduces motor torque pulsation, promotes motor noise performance.

The purpose of the utility model can be realized by the following technical scheme: the utility model provides a stator and cooling structure for full superconducting motor of disk, which comprises a housin, a serial communication port, it is first that be equipped with a set of correspondence in the casing and set up, second stator locating plate, it is first, be equipped with first stator cooling circuit between the second stator locating plate in proper order, the centralized runway winding of stator and second stator cooling circuit, be provided with the excitation iron core array between the centralized runway winding of stator and the second stator cooling circuit, the structure of the centralized runway winding of stator and the structure of excitation iron core array are mutually supported and are corresponded the setting, through first between the structure of the centralized runway winding of stator and the structure of excitation iron core array, the second stator locating plate is fixed.

The utility model discloses in the form of the centralized winding of fractional slot is adopted to the motor, and general pole slot cooperation number is all can, and the rotor pole number is better with the least common multiple of stator slot number more, nevertheless along with the increase of motor pole slot number, density also can corresponding increase, causes the camber of rotor winding superconducting tape to increase, and the deformation rate that here needs restraint stator winding can not exceed 0.2%.

Preferably, the excitation iron core array comprises a plurality of stator pole shoes which are uniformly distributed along the circumference, winding arrangement grooves are arranged on two side edges of the stator pole shoes, the stator centralized runway windings are wound on the stator pole shoes one by one, the thickness of each stator pole shoe is 4-12mm, and a gap is arranged between every two adjacent stator pole shoes.

Furthermore, a raised cylindrical positioning column is arranged on the second stator positioning plate, a circular clamping groove matched with the positioning column is arranged on the first stator positioning plate, the first stator positioning plate and the second stator positioning plate are in a regular polygon shape, the shape structures of the first stator positioning plate and the second stator positioning plate are matched with the bottom edge of the trapezoidal structure of the stator pole shoe, and the height of the positioning column is matched with the height of the stator pole shoe.

Furthermore, the first and second stator cooling passages have the same structure, and the field core array comprises a plurality of stator pole shoes which are uniformly distributed along the circumference, so that the inner side and the outer side of each stator pole shoe are in contact with at least one stator cooling passage.

Compared with the prior art, the technical scheme of the utility model except whole technical scheme's improvement, still include the improvement in the aspect of many details, particularly, have following beneficial effect:

1. the improved scheme of the utility model describes the technical characteristics that the structure of the centralized runway winding of stator and the excitation iron core array structure are mutually matched, cancels the design of the stator magnet yoke, can ensure that the stator magnetic field has no rotation change along the axial direction, ensures that the stator iron core can use anisotropic materials to greatly reduce the iron loss, and improves the motor efficiency and output;

2. in the technical scheme of the utility model, the excitation iron core array comprises a plurality of stator pole shoes which are evenly distributed along the circumference, so that the magnetic field generated by the stator is more even, the magnetic field distortion is reduced, and the vibration noise is reduced;

3. the utility model is provided with a group of stator cooling passage structures, the first and the second stator cooling passages are arranged between the adjacent stator pole shoes which are arranged in the circumference in a staggered way, so that the runway type coil is reduced below the critical temperature, the superconducting characteristic is shown, the loss is further reduced, and the power density of the motor is improved;

4. the utility model discloses a structure sets up rationally, and is high-efficient, is convenient for implement and promote.

Drawings

Fig. 1 is a schematic view of the explosion structure of the stator and rotor in cooperation with the present invention.

Fig. 2 is a schematic structural diagram of the stator and rotor of the present invention.

Fig. 3 is a schematic diagram of a single excitation core structure according to the present invention.

Fig. 4 is a schematic structural diagram of the excitation core array of the present invention.

Fig. 5 is a schematic structural diagram of a stator cooling passage according to an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a concentrated stator racetrack winding according to an embodiment of the present invention.

Fig. 7 is a schematic structural view of the first stator positioning plate according to an embodiment of the present invention.

Fig. 8 is a schematic structural view of a second stator positioning plate according to an embodiment of the present invention.

Fig. 9 is a schematic view of a connection structure between the concentrated stator track winding, the field core array and the stator positioning plate according to an embodiment of the present invention.

Fig. 10 is a schematic view of the connection structure between the concentrated stator track winding, the field core array, the stator positioning plate and the stator cooling passage according to the embodiment of the present invention.

Fig. 11 is a schematic structural view showing that two rotors have different magnetizing directions in the embodiment of the present invention.

The labels in the figure are as follows:

the stator comprises a rotor 1, a first stator positioning plate 2, a first stator cooling passage 3, a concentrated stator runway winding 4, an excitation iron core array 5, a second stator cooling passage 6 and a second stator positioning plate 7;

21 circular clamping grooves;

stator pole shoes 51, winding arrangement slots 52, upper end parts 53 and lower end parts 54;

71 cylindrical positioning post.

Detailed Description

The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings to make it clear to those skilled in the art how to practice the invention. While the invention has been described in connection with its preferred embodiments, these embodiments are intended to be illustrative, and not to limit the scope of the invention.

As shown in fig. 1, a stator for a disk-type full superconducting motor and a cooling structure thereof includes a housing, and is different from the prior art in that a set of first and second stator positioning plates 2 and 7 are provided in the housing, a first stator cooling passage 3, a stator centralized runway winding 4 and a second stator cooling passage 6 are sequentially provided between the first and second stator positioning plates, an excitation core array 5 is provided between the stator centralized runway winding and the second stator cooling passage, the structure of the stator centralized runway winding and the structure of the excitation core array are combined in a one-to-one correspondence manner, and the structure of the stator centralized runway winding and the structure of the excitation core array are fixed by the first and second stator positioning plates. The cooling structure described here is a cooling structure in which the first and second cooling passages are formed together, and the first and second cooling passages are provided independently of each other and are not communicated with each other. The outer sides of the first stator positioning plate and the second stator positioning plate are respectively provided with a rotor corresponding to the stator, the rotor adopts non-radial magnetization, yttrium barium copper oxide blocks with different heights are attached to the surface of the rotor, the magnetization mode is non-radial magnetization, and a three-dimensional radial Hellback array is adopted for magnetism gathering, so that the air gap magnetic density is greatly improved compared with that of a traditional magnetization method. Meanwhile, a cooling loop is embedded in the back iron of the rotor, and cooling liquid is filled through the hollow shaft, so that the yttrium barium copper oxide block is cooled to be below the critical temperature to show superconductivity.

Particularly, the utility model provides a motor design, on the basis of permanent-magnet disc motor, the design of stator excitation iron core yoke portion has been detached, makes magnetism feel the line and draws out by the surface mounted rotor N utmost point magnet steel, reachs stator excitation iron core via the air gap after, directly passes in stator excitation iron core inside diameter, reachs the S utmost point magnet steel that another rotor was reverse to magnetize via the air gap. Because the design of a magnet yoke of the rotor part is cancelled, the magnetic field of the rotor does not change along the axial direction, so that the excitation core of the stator can select an oriented silicon steel material or an anisotropic high-permeability material to replace the traditional non-oriented silicon steel and has stronger saturation flux density.

In one embodiment, a first stator cooling path, a stator concentrated type racetrack winding, a field core array and a second stator cooling path are sequentially arranged between the first stator positioning plate and the second stator positioning plate, wherein the stator concentrated type racetrack winding is wound outside each field core of the field core array, and the field core can adopt a pole shoe structure. Specifically, the excitation iron core array comprises a plurality of stator pole shoes 51 uniformly distributed along the circumference, winding arrangement grooves 52 are arranged on two side edges of the stator pole shoes and used for winding superconducting yttrium barium copper oxide tapes to form a centralized runway type winding, so that the centralized runway windings of the stator are wound on the stator pole shoes one by one, the thickness of the stator pole shoes is 4-12mm, and gaps are arranged between the adjacent stator pole shoes.

Particularly, the centralized runway winding of stator is around and fixes a position through first, second stator locating plate between the excitation iron core array, form a whole, be equipped with bellied cylindrical reference column 71 on the second stator locating plate here, be equipped with on the first stator locating plate with reference column matched with circular slot 21, first, second stator locating plate is regular polygon, its appearance structure is identical with one side base of the trapezium structure of stator pole shoe, the height of reference column and the highly matched with of stator pole shoe for first, second stator locating plate can play the fixed action to the direction of height of excitation iron core array just.

Furthermore, the stator centralized runway winding is formed by wrapping superconducting yttrium barium copper oxide strips, copper supports are added to the superconducting yttrium barium copper oxide strips during wrapping to support winding forming, and the notification supports can be arc sections and can be mutually continuous or discontinuous. Each stator pole shoe is formed by stacking a plurality of pieces of oriented silicon steel along the direction of a vertical rolling surface, the rolling direction is parallel to the direction of a magnetic circuit, the formed stator pole shoe comprises a middle iron core body and upper and lower end parts arranged at two ends of the iron core body, the iron core body is formed by butt joint and splicing of the bottom edges of two trapezoidal parts, and the upper and lower end parts are of a trapezoidal structure. The trapezoidal part is isosceles trapezoid, and upper and lower tip also is the isosceles trapezoid structure that corresponds with trapezoidal part, and the area of upper and lower tip is greater than the cross sectional area of iron core body. The iron core body is made of oriented silicon steel materials or directly poured by cobalt-based amorphous solution, so that the iron core loss can be greatly reduced, and the power density of the motor is improved.

In another embodiment, the cooling structure mainly comprises a first stator cooling passage structure and a second stator cooling passage structure, wherein the first stator cooling passage structure and the second stator cooling passage structure are the same, the excitation iron core array comprises a plurality of stator pole shoes which are uniformly distributed along the circumference, the first stator cooling passage and the second stator cooling passage are mutually staggered and wound between the adjacent stator pole shoes, so that the inner side and the outer side of each stator pole shoe are at least correspondingly arranged with one stator cooling passage, and the corresponding arrangement is that the cooling passages can generate effective cooling effect on the stator centralized runway winding, so that the stator centralized runway winding wound on the excitation iron core can be reduced to be below the critical temperature under the action of the stator cooling passages, the superconducting characteristic is shown, the superconducting loss is further reduced, and the power density of the motor is improved.

Specifically, the first stator cooling channel and the second stator cooling channel are made of glass fibers or copper pipes, the first stator cooling channel and the second stator cooling channel are arranged independently, the inner portions of the first stator cooling channel and the second stator cooling channel are of hollow structures, liquid inlets are formed in the first stator cooling channel and the second stator cooling channel, cooling liquid is communicated with the first stator cooling channel and the second stator cooling channel, and the cooling liquid is liquid nitrogen or liquid helium. Furthermore, the cooling liquid can be smoothly stored in the pipeline structure to ensure that the temperature of the yttrium barium copper oxide strip is reduced to be below the critical temperature. When the cooling liquid is introduced, the cooling liquid port is controlled, so that the original air in the cooling liquid can be smoothly discharged, and the pressure of the cooling liquid cannot be influenced by the atmospheric pressure exceeding 1 bar. After the air is exhausted, the coolant pressure is controlled to control the degree of filling of the coolant in the stator cooling circuit.

In the stator structure, the distance between adjacent pole shoes is as follows: the distance is 3-10 mm near the edge, the distance is 8-20 mm far away from the edge, the pole shoe thickness is 4-12mm, wherein the positioning plate member is made of low temperature resistant resin material, and the shape of the sharp corner of the positioning plate member is attached to two short sides of the stator core so as to play a positioning role. The inclined angle theta of the stator bevel edge is 6-40 degrees, the slot spacing is reasonable according to the matching of different pole slots, so that the angle change can be generated, the thickness of the whole stator excitation iron core is 30-80 mm thick, and the specific thickness can be adjusted according to the matching of the pole slots and the outer diameter of the stator. The number of slots can be used to indicate that the stator employs several winding and core assemblies, for example, six winding and core assemblies in this embodiment, that the number of slots is 6, the number of stator poles is 4, and there are 2 opposite poles.

In this embodiment, the two rotors have different magnetizing directions, and the N pole of the lower rotor substantially corresponds to the S pole of the upper rotor, thereby forming a closed magnetic circuit. In order to eliminate torque pulsation, the rotor can adopt a slant pole structure, and the yttrium barium copper oxide block can be designed in a segmented mode. The oblique pole structure of the disc type motor is different from that of a drum type motor, the same point is that two rows of magnetic steels are circumferentially arranged and staggered by a certain angle, the staggered angle is an oblique pole angle, the maximum value is smaller than the angle between every two magnetic steels in a Hellback array (totally 12 blocks) adopting 2 pairs of 3 groups of magnetic steels, and the greater the oblique pole angle is, the stronger the weakening capability of torque pulsation is, but the average output torque can be reduced. Here the yttrium barium copper oxygen bulk material of surface-mounted formula aims at replacing the permanent magnet steel of neodymium iron boron material, and the form rectangle that can adopt or cylindrically can, the utility model discloses in the case be cylindrically, the magnet steel piecemeal can reduce the inside vortex that produces of magnet steel, because the volume of cubic permanent magnet is big more, the vortex that produces is big more. The block structure can be used for applying the oblique pole technology, and can be used for effectively reducing the eddy current loss of the magnetic steel and further improving the density of the motor.

In a specific embodiment, the rotor back iron external diameter that the scheme was selected for use is 180mm, and 4 utmost points 6 grooves are selected for use in this motor pole groove cooperation, to the utility model discloses its pole groove cooperation of motor satisfies the minimum common multiple of rotor level, stator groove number Max { LCM (rotor pole number, stator groove number) } is better more. The outer diameter of the rotor and the size of the stator excitation iron core can be designed according to different sizes and pole slot matching modes.

In this embodiment, the stator outer diameter is 180mm, the pole shoe thickness is 5mm, the stator pole shoe includes middle iron core body and upper and lower end portions arranged at two ends of the iron core body, the iron core body is formed by butt-jointing and splicing the bottom edges of two trapezoidal portions, so the iron core body has three widths, namely 16mm, 47mm and 24mm, wherein 47mm is the width of the bottom edge, namely the butt-joint of the two trapezoidal portions, and 16mm and 24mm are the lengths of the top edges of the two trapezoidal portions, which is detailed in the structure shown in fig. 3. The width of the air gap is 1mm, and the measurement mode is the distance from the highest end faces of the permanent magnets of the N pole and the S pole of the rotor to the pole shoe of the stator. The width of the runway type superconducting strip is 30mm, a centralized winding is adopted, the number of turns is 120 turns, the maximum expansion and contraction length rate of the runway type winding of the topological structure is not more than 0.2% due to the brittleness of the superconducting strip, a disconnected copper support can be adopted for supporting the inside of the runway type winding, and the runway type superconducting strip is unsupported in the implementation case. The excitation core of the stator is made of low-temperature-resistant oriented silicon steel material with an inorganic coating, the thicknesses of N-pole superconducting materials and S-pole superconducting materials are 6mm, and the thicknesses of corresponding magnetism-assisting superconducting materials are 5mm and 4.5 mm. The larger the outer diameter of the rotor is, the thickness of the rotor, the length of the air gap and the thickness of the superconducting block material need to be adjusted correspondingly.

Furthermore, in the present embodiment, the stator water channel portion is in an unconnected form, and the upper end and the lower end of the stator water channel portion are respectively and tightly attached to the lower end surface of the stator pole shoe portion and are distributed up and down, so that each coil can be fully cooled in a surrounding manner in the overall view. The pipeline structure adopts a low-temperature-resistant glass fiber structure, so that the operating temperature of the stator runway coil is reduced to be below the critical temperature, and the coil generates superconductivity.

Furthermore, the locating plate is nested structure in this embodiment, and its thickness just equals excitation core's pole shoe thickness, and the material is low temperature resistant resin structure, guarantees can not take place the fragility under the liquid nitrogen temperature.

Further, the utility model discloses an in the embodiment, the rotor hollow shaft carries out the transmission through the screw hole on the rotor disc, and the rotor disc drives rotor space axle and rotates, spreads the mechanical energy that the rotor produced.

Further, in the embodiment of the present invention, the rotor adopts non-radial magnetization, and the rotor is provided with 12 integral multiple of block-shaped yttrium barium copper oxide materials, and has a quadrupole structure. The magnetizing directions of the four yttrium barium copper block materials in the directions perpendicular to each other are vertical upward or downward, the magnetizing directions of two adjacent yttrium barium copper oxide materials are distributed along the magnetic force line in the magnetizing direction, the magnetizing directions of the two rotors are different, and the magnetic poles are opposite, as shown in fig. 11.

Further, the upper and lower rotors should be non-magnetic when they are manufactured. And magnetizing the rotor by a non-radial magnetizing large-current capacitive magnetizing machine. At the moment, liquid nitrogen cooling liquid is introduced into the rotor back iron through the inside of the hollow shaft, and the filling degree of the cooling liquid passage inside the rotor is controlled by controlling the internal pressure of the cooling liquid of the through opening. At the moment, the yttrium barium copper oxide bulk material pasted with the surface heat transfer adhesive shows superconducting property due to the cooling of the liquid nitrogen, and a closed magnetic field generated by the magnetizing current is sealed inside the bulk material by the superconducting material due to the complete diamagnetism of the superconducting material, so that the bulk material can be equivalent to a permanent magnet structure with ultrahigh magnetic energy product.

It should be noted that many variations and modifications of the embodiments of the present invention are possible, which are fully described, and are not limited to the specific examples of the above embodiments. The above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. In conclusion, the scope of the present invention shall include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art, and shall be subject to the appended claims.

Claims (8)

1. The utility model provides a stator and cooling structure for full superconducting motor of disk, which comprises a housin, a serial communication port, it is first that be equipped with a set of correspondence in the casing and set up, second stator locating plate, it is first, be equipped with first stator cooling circuit between the second stator locating plate in proper order, the centralized runway winding of stator and second stator cooling circuit, be provided with the excitation core array between the centralized runway winding of stator and the second stator cooling circuit, the structure of the centralized runway winding of stator sets up with the structure cooperation of excitation core array, through first between the structure of the centralized runway winding of stator and the structure of excitation core array, the second stator locating plate is fixed.

2. The stator for the disk type full superconducting motor and the cooling structure thereof according to claim 1, wherein the field core array comprises a plurality of stator pole shoes uniformly distributed along the circumference, winding arrangement grooves are formed on two sides of the stator pole shoes, stator concentrated type racetrack windings are wound on the stator pole shoes one by one, the thickness of the stator pole shoes is 4-12mm, and gaps are formed between adjacent stator pole shoes.

3. The stator for the disc type full superconducting motor and the cooling structure thereof as claimed in claim 2, wherein the second stator positioning plate is provided with a raised cylindrical positioning post, the first stator positioning plate is provided with a circular slot matched with the positioning post, the first and second stator positioning plates are regular polygons, and the external shape structure of the first and second stator positioning plates is matched with the side edge structure of the stator pole shoe.

4. The stator for the disk type full superconducting motor and the cooling structure thereof as claimed in claim 1, wherein the first and second stator cooling passages have the same structure, the field core array includes a plurality of stator pole pieces uniformly distributed along the circumference, and the first and second stator cooling passages are alternately wound between the adjacent stator pole pieces so that the inner and outer sides of each stator pole piece are disposed corresponding to at least one stator cooling passage.

5. The stator for the disc-type full-superconducting motor and the cooling structure thereof according to claim 4, wherein the first and second stator cooling channels are made of glass fiber or copper tubes, the first and second stator cooling channels are independently arranged and have a hollow structure inside, the first and second stator cooling channels are provided with liquid inlets, cooling liquid is introduced into the first and second stator cooling channels, and the cooling liquid is liquid nitrogen or liquid helium.

6. The stator for the disc-type full superconducting motor and the cooling structure thereof according to claim 2, wherein each stator pole shoe is formed by stacking a plurality of pieces of oriented silicon steel along a vertical rolling direction, the formed stator pole shoe comprises a middle iron core body and upper and lower end portions arranged at two ends of the iron core body, the iron core body is formed by splicing two bottom edges of trapezoidal portions in a butt joint mode, and the upper end portion and the lower end portion are of a trapezoidal structure.

7. The stator for the disk type full superconducting motor and the cooling structure thereof as claimed in claim 1, wherein the stator concentrated type racetrack winding is formed by wrapping superconducting yttrium barium copper oxide tapes, and copper brackets are added to the superconducting yttrium barium copper oxide tapes during wrapping for supporting winding formation.

8. The stator for the disk type full superconducting motor and the cooling structure thereof as claimed in claim 6, wherein the iron core body is made of oriented silicon steel material or directly made of cobalt-based amorphous super-cooled melt by copper molding.

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