CN219145115U

CN219145115U - Stator assembly of magnetic suspension pump, magnetic suspension pump and turbine device

Info

Publication number: CN219145115U
Application number: CN202320537146.4U
Authority: CN
Inventors: 尹成科; 尤志强
Original assignee: Suzhou Suci Intelligent Technology Co ltd
Current assignee: Suzhou Suci Intelligent Technology Co ltd
Priority date: 2023-03-20
Filing date: 2023-03-20
Publication date: 2023-06-06
Anticipated expiration: 2033-03-20

Abstract

The invention relates to a stator assembly of a magnetic suspension pump, the magnetic suspension pump and a turbine device, comprising a plurality of stator iron cores, wherein each stator iron core comprises a plurality of laminations, and each lamination comprises a first part and a second part; the plurality of first portions constitute a main body portion of the stator core, the plurality of second portions constitute projecting portions of the stator core, each of the projecting portions having a distal end in a second length direction away from the main body portion, the distal end having a distal end face configured to retract toward a direction approaching the main body portion first and then project toward a direction away from the main body portion; wherein the end surfaces of the laminations of the second portions of equal length lie in the same plane and the end surfaces of the laminations of the second portions of unequal length lie in different planes so that at least part of the end surfaces of the projections are formed in a stepped shape. The invention has simple processing procedures, eliminates the problems of burrs, flanging and the like existing in the wire cutting process, greatly improves the production yield, reduces the production cost and the labor cost, and reduces the mass production difficulty of the stator core.

Description

Stator assembly of magnetic suspension pump, magnetic suspension pump and turbine device

Technical Field

The invention relates to the technical field of magnetic suspension pumps, in particular to a stator assembly of a magnetic suspension pump, the magnetic suspension pump and a turbine device.

Background

The magnetic levitation technology is a technology for levitating an object by utilizing magnetic force to overcome gravity, and along with the rapid development of scientific technology, the application field of the magnetic levitation technology is wider and wider at present. The magnetic suspension pump takes a magnetic suspension motor arranged in a pump shell as a driving element, has the characteristics of no mechanical abrasion, low energy consumption, high allowable rotating speed, low noise, long service life, no need of lubrication and the like, and is widely applied to the field of semiconductors.

The patent I discloses a high-efficiency magnetic coupling suspension pump, wherein a stator core is an annular whole, a magnetic yoke part extends inwards, a coil sleeve is sleeved on the magnetic yoke part, the radial dimension of a stator taking the stator core as a main body is generally larger, and when the stator core is applied to the magnetic suspension pump, the radial direction of the stator core is approximately the same as the horizontal direction, and the whole occupied area of the magnetic suspension pump using the stator core is generally larger.

In order to solve the problem that the occupied area of the magnetic suspension pump is large, I also provide another magnetic suspension pump, the magnetic suspension pump adjusts the stator structure, a stator core of the magnetic suspension pump comprises an iron core rod and a magnetic yoke part, the magnetic yoke part is positioned at one end of the iron core rod, a plurality of stator cores are arranged at preset positions through a bracket, and in order to ensure the accuracy of the positions of the stator cores, the bracket is usually an integral body, and a plurality of through grooves for the insertion of the stator cores are circumferentially arranged. Due to the high precision requirement in the magnetic levitation field, when the stator iron cores are assembled to the bracket, the sizes of the stator iron cores and the sizes of the through grooves are just matched, the stator iron cores can be just inserted into the through grooves of the bracket, namely, the centers of the stator iron cores and the rotor are guaranteed to be identical or approximately identical, so that the rotor can be stably suspended at the central position, meanwhile, the volumes of the stator iron cores are identical or approximately identical, so that when windings on the stator iron cores are electrified, the generated magnetic fields are identical or approximately identical, the parameters required by the stator iron cores are identical or approximately identical, the debugging is more convenient, and the magnetic suspension pump can realize mass production. However, as shown in fig. 1, the stator core used in the magnetic suspension pump is generally formed by laminating a plurality of laminations, and the plurality of laminations are punched and then laminated and riveted at the time of manufacturing the same, and the end face of the formed stator core adjacent to the rotor is a plane. In order to ensure that the air gaps between the stator cores and the rotor are the same, the tail end surfaces of the laminated and riveted laminations are cut by a wire cutting process so that the tail end surfaces are arc-shaped, thereby ensuring that the air gaps between the stator cores and the rotor are consistent and further ensuring the stable operation of the rotor. However, the working procedures of the processing mode are complex, the cutting surface of the stator core is easy to generate stress and burrs when the wire cutting is carried out on the tail end surface of the stator core, the lamination sheets on two sides of the stator core are easy to turn up when the wire cutting angle is controlled inaccurately, the stator core is damaged, the production cost is further increased, and the processing mode is not suitable for mass production of the stator core.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to solve the problems that in the prior art, a plurality of laminations are riveted, then the end face of the stator core is cut by a wire to form an arc face, the processing procedure is complex, stress and burrs are generated on the cutting face of the stator core, and the laminations on two sides are turned up, so that the stator core is damaged, and the production cost is increased.

In order to solve the technical problems, the invention provides a stator assembly of a magnetic suspension pump, the magnetic suspension pump and a turbine device, wherein end faces with equal lengths of second parts of laminations are arranged on the same plane, and end faces with unequal lengths of the second parts are arranged in different planes, so that the end face of a stator core forms a stepped shape which is firstly retracted towards a direction close to the first part and then protrudes towards a direction far from the first part, the end face of the stator core is approximately in a circular arc shape, the air gap between the stator core and a rotor is approximately the same, and the rotor can stably perform suspension rotation. The processing procedure is simple, the problems of burrs, flanging and the like existing in the linear cutting process are abandoned, the production yield is greatly improved, the production cost and the labor cost are reduced, and the mass production difficulty of the stator core is reduced.

The application provides a stator assembly of a magnetic suspension pump, comprising:

a plurality of stator cores including a plurality of laminations stacked on each other in a stacking direction, each of the laminations including a first portion extending in a first length direction, a second portion extending in a second length direction and connected to the first portion, the first length direction and the second length direction being perpendicular to the stacking direction and intersecting each other;

a plurality of the first portions constituting a main body portion of the stator core, a plurality of the second portions constituting projecting portions of the stator core, each of the projecting portions having a distal end in the second length direction away from the main body portion, the distal end having a distal end face constituted by end faces of a plurality of laminations, the distal end face being configured to retract toward a direction approaching the main body portion and then project toward a direction away from the main body portion in the lamination direction;

wherein the end surfaces of the laminations with equal lengths of the second portions are positioned in the same plane, and the end surfaces of the laminations with unequal lengths of the second portions are positioned in different planes, so that at least part of the end surfaces of the protruding portions are formed into a step shape.

Further, the end surface of the protrusion has a center line parallel to the first length direction, and the end surface is symmetrical with respect to the center line.

Further, the plurality of laminations include N groups of laminations stacked on each other along the stacking direction, and lengths of two adjacent groups of laminations along the second length direction are unequal, wherein N is more than or equal to 3 and is an odd number.

Further, the plurality of laminations includes n groups of laminations having unequal lengths along a second length direction, in which the lengths of the n groups of laminations along the second length direction decrease in sequence toward the main body portion,

n is more than or equal to 2 and is an integer.

Further, defining a group of lamination sheets with the shortest length along the second length direction as a first group of lamination sheets, wherein n-1 groups of lamination sheets are respectively arranged on two sides of the first group of lamination sheets in the stacking direction, and the lengths of the n-1 groups of lamination sheets along the second length direction are sequentially decreased towards the direction adjacent to the main body part;

in the top end face of the stator core along the first length direction, the intersection of the end face of the first group of laminations and the top end face is defined as a first straight line, a first midpoint is arranged on the first straight line, a connecting line of the first midpoints in two opposite stator cores is defined as a diameter D, the midpoint of the diameter D is defined as a circle center, the circle center and the diameter D are used for forming a circle, the endpoints of the n-1 group of laminations adjacent to the first midpoint are all located on the circle, a calculation formula of the circle is (mh 0) plus (D/2-Ld) = (D/2), m is the number of laminations corresponding to each endpoint, h0 is the thickness of a single lamination, and Ld is the length difference of two adjacent groups of laminations in the second length direction.

Further, the inner circumference sides of the plurality of stator cores which are distributed in the circumferential direction are positioned on the same circular surface.

Further, the length difference of two adjacent groups of laminations with different lengths along the second length direction is equal in the second length direction.

Further, the number of the n groups of lamination sheets with different lengths along the second length direction is different, and in the stacking direction, the number of the lamination sheets in the n groups of lamination sheets is sequentially increased or decreased towards the direction approaching to the protruding part.

Further, the stator core includes a plurality of laminations stacked on each other in a stacking direction, each of the laminations being made of a soft magnetic material.

Further, each lamination is provided with a lamination structure, every two adjacent laminations are mutually laminated through the lamination structure,

the stacking and riveting structure comprises at least one of stacking and riveting protrusions, stacking and riveting grooves and stacking and riveting through grooves.

Further, the plurality of laminations includes:

the laminating machine comprises at least two first laminates, wherein each first laminate is provided with two laminating surfaces which are opposite in laminating direction, laminating protrusions and laminating grooves are respectively arranged on the two laminating surfaces, and the at least two first laminates are configured to be inserted into the laminating grooves of the other first laminates through the laminating protrusions of one first laminate, so that the at least two first laminates are laminated with each other.

Further, the stacking rivet protrusion is a circular protrusion protruding in the stacking direction, and the stacking rivet groove is a circular groove recessed in the stacking direction.

Further, the stacking rivet protrusion is a V-shaped protrusion protruding in the stacking direction, and the stacking rivet groove is a V-shaped groove recessed in the stacking direction.

Further, the plurality of laminations further includes:

the second lamination is provided with two overlapped and riveted surfaces which are opposite to each other in the overlapped and riveted direction, the second lamination comprises an overlapped and riveted groove which penetrates through the two overlapped and riveted surfaces of the second lamination, and the other first lamination is configured to enable the overlapped and riveted protrusion of the other first lamination to be inserted into the overlapped and riveted groove of the second lamination, so that the second lamination and the at least two first laminations are overlapped and pressed with each other.

Further, the protruding distance of the stacking riveting protrusion protruding the stacking riveting surface is smaller than or equal to the recessed distance of the stacking riveting groove recessed into the other stacking riveting surface.

Further, each of the laminations is L-shaped, and in the second length direction, the first portion of the lamination is designed with a chamfer or rounded corner at the top end remote from the second portion.

Further, the stator core includes a progressive molded lamination.

Further, the stator assembly further comprises a plurality of windings, and at least one winding is arranged on the main body part of each stator core.

The application also provides a magnetic suspension pump, including above magnetic suspension pump's stator module, rotor, stator module can be under the running state contactless geomagnetic drive with support the rotor.

The application also provides a turbine device comprising the magnetic suspension pump.

Compared with the prior art, the technical scheme of the invention has the following advantages:

according to the invention, the end surfaces of the second parts of the lamination, which are equal in length, are arranged on the same plane, and the end surfaces of the second parts, which are unequal in length, are arranged in different planes, so that the end surface of the stator core forms a step shape which is retracted towards the direction close to the first part and then protrudes towards the direction far away from the first part, the end surface of the stator core is approximately in the shape of an arc, the air gap between the stator core and the rotor is approximately the same, and the rotor can stably perform suspension rotation. The processing procedure is simple, the problems of burrs, flanging and the like existing in the linear cutting process are abandoned, the production yield is greatly improved, the production cost and the labor cost are reduced, and the mass production difficulty of the stator core is reduced.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of a prior art stator core;

fig. 2 is a schematic structural view of a stator core in embodiment 1 of the present invention;

FIG. 3 is an enlarged view at A in FIG. 2;

fig. 4 is a front view of a stator core in embodiment 1 of the present invention;

fig. 5 is a schematic view of a projection in a right side view of a stator core in embodiment 1 of the present invention;

fig. 6 is a plan view of a stator core in embodiment 1 of the present invention;

fig. 7 is a schematic view of a stator core on a circle in embodiment 2 of the present invention;

fig. 8 is an enlarged view at B in fig. 7;

fig. 9 is a schematic view of 8 stator cores on a circle in embodiment 2 of the present invention;

FIG. 10 is a schematic view of a single piece laminate in an embodiment of the invention;

FIG. 11 is a schematic illustration of a multi-piece lamination stack in accordance with an embodiment of the invention;

FIG. 12 is an enlarged view of a portion of a laminate being staked in a circular staking configuration in accordance with an embodiment of the present invention;

FIG. 13 is an enlarged view of a portion of a laminate being clinched in a V-shaped clinching configuration in accordance with an embodiment of the present invention;

FIG. 14 is a schematic view of a single piece lamination top having a chamfer in an embodiment of the invention;

fig. 15 is a schematic diagram of a magnetic suspension pump according to an embodiment of the present invention.

Description of the specification reference numerals: 10. a stator assembly; 11. a stator core; 111. lamination; 1111. a first portion; 1112. a second portion; 1113. an end face; 1114. a top end; 112. a main body portion; 113. a protruding portion; 1131. a distal end face; 1132. a center line; 114. a first set of laminations; 1141. a first straight line; 1142. a first midpoint; 115. a second set of laminations; 116. a third set of laminations; 117. a first lamination; 1171. stacking and riveting surfaces; 118. a second lamination; 12. a first winding; 13. a second winding;

20. a stacked rivet structure; 21. stacking and riveting the bulges; 22. overlapping and riveting the grooves; 23. a stacking rivet through groove;

30. a rotor;

40. a magnetic suspension pump.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.

In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", "front", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. The terms "comprises" and "comprising," and any variations thereof, in the description and claims of the invention and in the foregoing drawings, are intended to cover a non-exclusive inclusion, such that a system, article, or apparatus that comprises a list of elements is not necessarily limited to those elements expressly listed but may include other elements not expressly listed or inherent to such article or apparatus.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to fig. 1-15 and the detailed description.

The stator assembly of the magnetic suspension pump of this application includes: a plurality of stator cores 11 are provided,

the stator core 11 includes a plurality of laminations 111 stacked on each other in a stacking direction, each of the laminations 111 including a first portion 1111 extending in a first length direction, a second portion 1112 extending in a second length direction and connected to the first portion 1111, the first length direction and the second length direction being perpendicular to the stacking direction and intersecting each other;

a plurality of the first portions 1111 constitute a main body portion 112 of the stator core 11, a plurality of the second portions 1112 constitute projecting portions 113 of the stator core 11, each of the projecting portions 113 having a tip end distant from the main body portion 112 in the second length direction, the tip end having a tip end face 1131, the tip end face 1131 being constituted by end faces 1113 of the plurality of laminations 111, the tip end face 1131 being configured to retract toward the first portions 1111 before projecting toward the first portions 1111 in the lamination direction;

Wherein the end surfaces 1113 of the laminations 111 having the same length of the second portion 1112 are located in the same plane, and the end surfaces 1113 of the laminations 111 having different lengths of the second portion 1112 are located in different planes, so that at least part of the end surfaces 1131 of the stator core 11 are formed in a stepped shape.

Specifically, referring to fig. 2 and 3, in the present embodiment, the stator assembly 10 of the magnetic suspension pump 40 includes: a plurality of stator cores 11. The stator core 11 includes a plurality of laminations 111 stacked on each other in a stacking direction. The number of laminations 111 included in one of the stator cores 11 is determined according to actual needs. Each of the laminates 111 includes a first portion 1111 extending in a first length direction, and a second portion 1112 extending in a second length direction and connected to the first portion 1111, as shown in fig. 7. The first length direction is the direction indicated by i1, and the second length direction is the direction indicated by i 2. The first length direction and the second length direction are perpendicular to the stacking direction and intersect each other. Preferably, the first length direction and the second length direction are perpendicular to each other. Each of the second portions 1112 has an end surface 1113 remote from the first portion 1111 in the second length direction, as shown in fig. 3. It should be noted that, the first portion 1111 and the second portion 1112 may be fixed together by welding, or may be integrally formed, and in this embodiment, it is preferable to use an integrally formed method to ensure stability of the single piece of the laminated sheet 111. The plurality of first portions 1111 constitute the main body 112 of the stator core 11. A plurality of the second portions 1112 constitute the protruding portions 113 of the stator core 11, as shown in fig. 2. Each of the protruding portions 113 has a distal end that is distant from the main body portion 112 in the second length direction. The tip has a tip face 1131. The end face 1131 is formed by end faces 1113 of the plurality of laminations 111. In the stacking direction, the end surface 1131 is configured to retract toward the main body 112 and then protrude away from the main body 112, and the end surface 1131 includes, but is not limited to, the shape of the end surface 1131 in fig. 6. Wherein the end surfaces 1113 of the laminations 111 having the same length of the second portion 1112 are located in the same plane, and the end surfaces 1113 of the laminations 111 having different lengths of the second portion 1112 are located in different planes, so that at least part of the end surfaces 1131 of the stator core 11 are formed in a stepped shape. It should be noted that, at least part of the distal end surface 1131 described herein refers to a difference in length between the laminations 111 of the adjacent two second portions 1112 having different lengths to form a step shape. According to the invention, the end surfaces 1113 with equal lengths of the second parts 1112 of the lamination 111 are arranged on the same plane, and the end surfaces 1113 with unequal lengths of the second parts 1112 are arranged in different planes, so that the tail end surface 1131 of the stator core 11 is formed into a step shape which is firstly retracted towards the direction close to the main body 112 and then protrudes towards the direction far away from the main body 112, the tail end surface 1131 of the protruding part 113 is approximately in the shape of an arc, the air gap between the stator core 11 and the rotor 30 is approximately the same, and the rotor 30 can stably perform suspension rotation. The processing procedure is simple, the problems of burrs, flanging and the like existing in the wire cutting process are abandoned, the production yield is greatly improved, the production cost and the labor cost are reduced, and the mass production difficulty of the stator core 11 is reduced.

Specifically, in the present embodiment, the protruding portion 113 is seen from the right side view of the stator core 11, i.e., from the direction indicated by i4 in fig. 4, toward the stator core 11, as shown in fig. 5. The end surface 1131 of the protrusion 113 has a center line 1132 parallel to the first length direction, and the end surface 1131 is symmetrical with respect to the center line 1132, that is, the shape of the lamination 111 on both sides of the center line 1132 is consistent with the length in the second direction at the corresponding position. For example, as shown in fig. 8, the total number of laminations 111 in one stator core 11 is 34, the number of laminations 111 disposed on both sides of the center line 1132 is 17, and the number and placement positions of the laminations 111 having the same length of the second portion 1112 are the same.

Specifically, in the present embodiment, the plurality of laminations 111 includes N groups of laminations 111 stacked on each other along the stacking direction. The adjacent two sets of laminations 111 are not equal in length along the second length direction. Wherein N is more than or equal to 3 and is an odd number, namely N can be 3, 5, 7 and the like. As shown in fig. 6, in embodiment 1, 7 sets of laminations 111 are included in the stator core 11. As shown in fig. 8, in embodiment 2, 3 sets of laminations 111 are included in the stator core 11. Further, the greater the number of groups of laminations 111 included in the stator core 11, the higher the corresponding mold opening cost, i.e., the higher the production cost. However, the performance of the stator core 11 gradually tends to a stable value as the number of the lamination 111 increases, that is, a person skilled in the art can determine the number of the lamination 111 included in the stator core 11 according to the mold-opening cost of the lamination 111 and the performance of the stator core 11, so as to make the performance of the stator core 11 best within a reasonable cost, thereby pursuing an optimal cost performance.

Specifically, in the present embodiment, the plurality of laminations 111 includes n groups of laminations 111 that are unequal in length along the second length direction. Wherein, the liquid crystal display device comprises a liquid crystal display device,

n is more than or equal to 2 and is an integer. For example: when 3 groups of laminations 111 are included in the stator core 11, among them, the laminations 111 having unequal lengths in the second length direction are 2 groups; when 5 sets of laminations 111 are included in the stator core 11, among them, 3 sets of laminations 111 having unequal lengths in the second length direction. In the stacking direction, the lengths of the n sets of lamination sheets 111 in the second length direction decrease in order toward the main body 112. For example: in embodiment 2, the plurality of laminations 111 includes a first set of laminations 114, a second set of laminations 115, and a third set of laminations 116. The first set of laminations 114 have a first length along the second length direction. The second set of laminations 115 has a second length along the second length direction. The third set of laminations 116 has a third length along the second length direction. As can be seen in fig. 7 and 8, the lengths of the first set of laminations 114 and the third set of laminations 116 are equal, i.e. the lengths of the first set of laminations 114 and the second set of laminations 115 or the third set of laminations 116 and the second set of laminations 115 decrease in sequence in a direction towards the first portion 1111. A difference in length between the first length and the second length, and a difference in length between the third length and the second length, such that the stator core 11 At least a part of the distal end face 1131 is formed in a stepped shape. In this embodiment, a person skilled in the art only needs to open the die for the laminations 111 with two lengths, so as to stack and rivet the laminations together, thereby simplifying the production process, avoiding the process of wire cutting the end surface 1131 of the stator core 11 in the prior art, and greatly improving the production yield.

Specifically, in embodiment 1, a group of lamination sheets 111 having the shortest length in the second length direction is defined as a first group of lamination sheets 114, with reference to fig. 4 and 5. In the stacking direction, n-1 sets of lamination sheets 111 are respectively disposed on two sides of the first set of lamination sheets 114, and lengths of the n-1 sets of lamination sheets 111 along the second length direction decrease in sequence towards a direction adjacent to the main body portion 112. In the top 1114 surface 1113 of the stator core 11 along the first length direction, a first straight line 1141 is defined at the intersection of the end surface 1113 of the first set of laminations 114 and the top 1114 surface 1113, a first midpoint 1142 is disposed on the first straight line 1141, a line connecting the first midpoints 1142 in the two opposite stator cores 11 is defined as a diameter D, a midpoint of the diameter is defined as a center, the center is used as an origin, two diameters perpendicular to each other are used as an X axis and a Y axis, an X-Y coordinate system is established, and a circle is constructed on the X-Y coordinate system, as shown in fig. 7, the Y axis passes through the first midpoint 1142 of the first set of laminations 114. The corresponding lamination 111 in the positive X-axis direction is defined as a second set of laminations 115, the end point of the second set of laminations 115 adjacent to the first midpoint 1142 of the first set of laminations 114 being point C, the abscissa of point C being the number of laminations 111 times the thickness of the individual laminations 111, the ordinate of point C being the radius of the circle minus the difference in length between the first set of laminations 114 and the second set of laminations 115, the circular calculation formula constructed by the origin and point C being (mh 0) + (D/2-Ld) = (D/2). Where m is the number of laminations 111 corresponding to each end point, h0 is the thickness of a single lamination 111, and Ld is the length difference between two adjacent groups of laminations 111 in the second length direction. Since the diameter D of the circle and the thickness h0 of the single lamination 111 can be determined in advance by a person skilled in the art to be a known quantity, a person skilled in the art can determine the number m of laminations 111 corresponding to each end point according to actual needs, and further calculate the length difference Ld of two adjacent groups of laminations 111 according to the circle equation, thereby ensuring that the end points of each group of laminations 111 all satisfy the circle equation. Lamination 111, which is symmetrical with respect to the second set of laminations 115 with respect to the first set of laminations 114, is defined as a third set of laminations 116, i.e. the end points of the third set of laminations 116 adjacent to the midpoint of said first set of laminations 114 are also located on said circle. It should be noted that the circular equation is not limited to the case of satisfying only three sets of laminations in the drawings, and when the number of sets of laminations 111 is greater than 3, it is only necessary to reasonably determine the number of laminations 111 in each set, and calculate the length difference between two adjacent sets of laminations 111, so that the end points of each set of laminations 111 adjacent to the midpoint of the first set of laminations 114 are all located on the circle. In the present embodiment, the distribution states of the laminations 111 of different sizes in the stator core 11 are determined by the circular equation so that the distances between each lamination 111 on the stator core 11 and the rotor 30 are approximately the same, thereby making the effective magnetic air gap between the stator core 11 and the rotor 30 as small as possible, and the axial size of the magnetic suspension pump 40 can be reduced while the fluctuation of the torque of the rotor 30 is reduced. And the arrangement of the laminations 111 with different lengths can meet the requirement that the end points are all positioned on the circle, so that the wire cutting process is omitted compared with the prior art, and the problems of flanging and burrs of the stator core 11 caused by wire cutting are avoided.

Specifically, as shown in fig. 9, in the present embodiment, the number of the stator cores 11 is 8. It should be noted that, in the present application, the number of the stator cores 11 is not limited, and a person skilled in the art may determine the number of the stator cores 11 according to the actual working condition. The inner circumferential sides of the 8 stator cores 11 after being circumferentially arranged are located on the same circular surface, so that the air gap between the end surface 1131 of each stator core 11 and the rotor 30 is consistent, and the rotor 30 can stably operate.

Specifically, as shown in fig. 6, in embodiment 1, the difference in length in the second longitudinal direction of the adjacent two sets of laminations 111 having different lengths in the second longitudinal direction is equal. In this arrangement, the end face 1131 of each stator core 11 is approximately circular, and the adjacent two sets of laminations 111 are arranged in an equi-differential manner, which can provide a reference standard for those skilled in the art to manufacture.

Specifically, in the present embodiment, the number of laminations in the n groups of laminations 111 having different lengths in the second longitudinal direction is different. In the stacking direction, the number of laminations in the n groups of laminations 111 sequentially increases or decreases in a direction toward the first portion 1111. In this embodiment, an arrangement of two numbers of laminations 111 is included. First kind: as shown in fig. 7, in the rising section of the end face 1131, the number of laminations in the adjacent two groups of laminations 111 having unequal lengths in the second length direction sequentially increases. At the descending section of the end face 1131, the number of laminations in the adjacent two groups of laminations 111 that are unequal in length along the second length direction decreases in sequence. I.e. at the rising section of said end face 1131, the number of laminations in each set 111 is 8, 16, respectively; at the lowered section of the end face 1131, the number of laminations in each set of laminations 111 is 16, 8, respectively. Second kind: at the rising section of the end face 1131, the number of laminations in the adjacent two groups of laminations 111 that are unequal in length along the second length direction decreases in sequence. At the descending section of the end face 1131, the number of laminations in the adjacent two groups of laminations 111 that are unequal in length along the second length direction sequentially increases. In the first preferred embodiment, the stator core 11 has the highest mechanical strength with the arrangement of the lamination number. Of course, the number of laminations in each set of laminations 111 and the trend of the variation in the number of laminations can be determined by one skilled in the art according to actual needs.

It should be noted that, in the stator core 11 of the present application, the number of sheets of the lamination 111, the number of groups of the lamination 111, the number of lamination 111 in each group, and the length of each group of lamination 111 may be variously arranged and combined. For example: as shown in fig. 7, in embodiment 1, the stator core 11 includes 34 lamination sheets 111, the 34 lamination sheets 111 are divided into 7 groups of lamination sheets 111, wherein 4 groups of lamination sheets 111 are different in length, the number of lamination sheets 111 in each group is sequentially 2, 3, 5, 14, 5, 3, 2 in the lamination direction, and the number of lamination sheets 111 in each group is increased in a direction approaching the first portion 1111 and then decreased in a direction separating from the first portion 1111; the length of each set of laminations 111 in the second length direction increases toward the first portion 1111 and decreases away from the first portion 1111. Of course, the arrangement of laminations 111 in the stator core 11 includes, but is not limited to. The specific structure of the stator core 11 can be determined by a person skilled in the art according to actual needs, so that the end surface 1131 of the stator core 11 is closer to the shape of an arc within a reasonable cost range, and the stability of the stator core 11 is the best.

Specifically, in the present embodiment, the stator core 11 includes a plurality of laminations 111 stacked on each other in the stacking direction. Each of the laminations 111 is made of a soft magnetic material. The soft magnetic material should include, but is not limited to: iron-silicon alloys (silicon steel sheets) and various soft magnetic ferrites.

Specifically, as shown in fig. 10, in this embodiment, each of the laminations 111 is provided with a rivet structure 20. Every adjacent two of the laminations 111 are stacked on top of each other by the stack 20. Wherein, the stacking rivet structure 20 comprises at least one of stacking rivet protrusions 21, stacking rivet grooves 22 and stacking rivet through grooves 23.

Further, as shown in fig. 11, in the present embodiment, the plurality of laminations 111 include: at least two first laminations 117. Each of the first laminations 117 has two staking faces 1171 that are opposite in the stacking direction. The two rivet surfaces 1171 are respectively provided with a rivet protrusion 21 and a rivet groove 22. The lamination protrusion 21 is disposed on a second lamination surface of the lamination 111 in the lamination direction, and the lamination recess 22 is disposed on a first lamination surface of the lamination 111 in the lamination direction. The at least two first laminations 117 are configured to be inserted into the staking recess 22 of one of the first laminations 117 by the staking tab 21 of the other of the first laminations 117 such that the at least two first laminations 117 are stacked upon one another. Further, the protruding distance of the stacking riveting protrusion 21 protruding from the one stacking riveting surface is smaller than or equal to the recessed distance of the stacking riveting recess 22 recessed from the other stacking surface, so that when two adjacent laminations 111 are stacked and riveted, the stacking protrusion 21 can completely sink into the stacking recess 22, so that the stacking surfaces 1171 of the two laminations 111 can be tightly attached to each other, gaps between the laminations 111 are avoided, the gaps between the two adjacent laminations 111 are larger, the actual stacking thickness of the stator core 11 is larger than the theoretical stacking thickness, the assembly difficulty of the stator core 11 is increased, and the use stability of the stator core 11 is affected. Preferably, the distance that the stacking riveting protrusion 21 protrudes from the stacking riveting surface 1171 is equal to the distance that the stacking riveting groove 22 is recessed into the stacking riveting surface 1171, and the stacking riveting surface 1171 is the largest and the stator core 11 after stacking riveting is more stable under the condition that the gap between two adjacent lamination sheets 111 is ensured to be as small as possible.

Specifically, as shown in fig. 12, in the present embodiment, the stacking rivet protrusion 21 is a circular protrusion protruding in the stacking direction. The lamination groove 22 is a circular groove recessed in the lamination direction. The circular stacking protrusions 21 vertically protrude outwards along the second stacking surface 1171, and the stacking grooves 22 vertically recess inwards along the first stacking surface 1171, that is, the stacking of the plurality of stacked sheets 111 is performed in a direction perpendicular to the stacking surface 1171 during stacking. The stacking riveting surface 1171 between two adjacent lamination sheets 111 in a vertical protruding manner is larger, the stacking riveting precision is higher, namely, when stacking riveting is performed between the lamination sheets, offset can not occur along any direction of the plane where the stacking riveting surface 1171 is located, and the stator core 11 after stacking riveting is more stable, but the production cost is more expensive.

In an alternative embodiment, as shown in fig. 13, the stacking rivet protrusion 21 is a V-shaped protrusion protruding in the stacking direction. The rivet-overlapping groove 22 is a V-shaped groove recessed in the overlapping direction. The V-shaped bulge protrudes outwards from the overlapped rivet face 1171 in an arc shape, and the V-shaped groove is recessed outwards from the overlapped rivet face 1171 in an arc shape. Compared with the round bulge, the V-shaped bulge has smaller lamination surface 1171, so that the stability of the stator core 11 after lamination and riveting is good because the stator core 11 subjected to lamination and riveting is not overlapped and riveted by the round bulge; but the V-shaped bulge is convenient to process and has lower production cost. It should be noted that the V-shaped protrusions in this embodiment are not limited to the shape shown in fig. 13, and the overall shape of the protrusions is substantially V-shaped, which falls within the scope of protection of this patent.

Further, in consideration of the factors of the processing mold, if an included angle exists between the cross-sectional edges of the stacking riveting protrusion 21 and the stacking riveting groove 22, the service life of the processing mold is easily affected, so that the shapes of the stacking riveting protrusion 21 and the stacking riveting groove 22 can be selected to be round, and the stability of the stator core 11 after stacking riveting can be ensured to be higher. The shape of the rivet protrusion 21 and the rivet groove 22 may be selected to be V-shaped by those skilled in the art in view of production costs. If the stability of the stator core 11 is higher when the stator core 11 is overlapped and riveted in the V shape, the overlapped and riveted structure 20 can be selected to be V shape by those skilled in the art, so as to ensure the low cost of the stator core 11 and facilitate the mass production of the stator core 11.

Further, as shown in fig. 11, in the present embodiment, the plurality of laminations 111 further includes a second lamination 118. The second lamination 118 has two lamination surfaces 1171 facing away from each other in the lamination direction. The second lamination 118 includes a rivet slot 23 extending through two rivet faces 1171 of the second lamination 118. The other first lamination 117 is configured such that its clinching projection 21 is inserted into the clinching groove 23 of the second lamination 118, so that the second lamination 118 and the at least two first laminations 117 are mutually overlapped. The lamination groove 23 is circular, and when the lamination protrusion 21 is circular, the lamination protrusion 21 is inserted into the lamination groove 23 to realize lamination of the lamination sheet 111. When the stacking and riveting protrusions 21 are V-shaped, the stacking and riveting protrusions 21 are inserted into the stacking and riveting through grooves 23, and it is required to ensure that the top ends 1114 of the stacking and riveting protrusions 21 are flush with the stacking and riveting surfaces 1171 of the second lamination 118.

Further, as shown in fig. 14, each lamination 111 has an L-shape, that is, the first portion 1111 and the second portion 1112 form the lamination 111 having an "L" shape, so that a plurality of laminations 111 can be stacked and riveted to form the stator core 11 having an "L" shape. In the second length direction, the first portion 1111 of the laminate 111 is designed with a chamfer or rounded corner away from the top end 1114 of the second portion 1112. Since the magnetic performance of the stator core 11 is related to the area of the second portion 1112 facing the rotor 30, in this embodiment, the first portion 1111 of the lamination 111 is designed to be chamfered or rounded at the tip 1114 of the second portion 1112 while ensuring the magnetic performance of the stator core 11, so that the size of the lamination 111 is reduced. Meanwhile, since the first portion 1111 of the lamination 111 is located away from the top end 1114 of the second portion 1112 in operation, there is no magnetic field, in this embodiment, welding may be performed at the chamfer or fillet to increase the stability of the stator core 11 formed by lamination. It should be noted that, when chamfering or rounding the top end of the first portion, as shown in fig. 14, it is required to ensure that the shortest distance between the point D and the chamfer at the top end 1114 is greater than or equal to the width of the protruding portion along the first length direction, that is, the shortest distance between the point D and the chamfer at the top end 1114, that is, the distance between the point D and the point W shown in fig. 14, that is, L1 is greater than or equal to L2. Since the magnetic performance of the stator core 11 is related to the area of the surface of the protruding portion 113 facing the rotor 30, it is only necessary to ensure that L1 be equal to or greater than L2 at the corner of the main portion 112 away from the protruding portion 113, that is, the area of 1/4 circle at the chamfer of the first portion 1111 of the lamination is greater than the area of the second portion 1112, so that the magnetic performance of the stator core 11 is not affected.

Specifically, in the present embodiment, the stator core 11 includes the progressive molded lamination 111. Stator core 11 is through progressive die stack riveting to make, utilizes the characteristic of progressive die itself promptly, can realize the processing action of whole stator core 11 in a set of process, improves stator core 11's production efficiency, and utilize progressive die processing stator core 11 time, can accomplish simultaneously and fold the riveting action to impurity's entering when having avoided pressing after stacking a plurality of lamination 111 in prior art. Meanwhile, each lamination 111 receives a certain punching force during lamination, so that the phenomenon of uneven single punching stress after lamination is avoided, and the lamination coefficient of the stator core 11 is improved; on the other hand, the lamination thickness tolerance of the stator core 11 after processing is lower due to higher precision of the progressive die itself.

Specifically, in the present embodiment, the stator assembly 10 further includes a plurality of windings. At least one winding is provided on the main body 112 of each of the stator cores 11. In an alternative embodiment, the windings in the stator assembly 10 are single windings, i.e. one winding is provided on each of the main portions 112 of the stator core 11. In this embodiment, one winding generates the drive and levitation functions without distinguishing between the drive and control coils, i.e. by adding or superimposing the values of the drive and control currents determined in each case by the control device by calculation (e.g. by means of software) and applying the resulting total current to the respective winding, the sum of the calculated drive and control currents being applied to the 8 windings in the stator assembly 10. In another alternative embodiment, the windings in the stator assembly 10 are double windings, i.e. two windings are provided on the main body 112 of each stator core 11, each winding surrounding the corresponding main body 112 and being arranged adjacent to each other with respect to the axial direction, the windings on the main body 112 of the adjacent two stator cores 11 being independent from each other. This embodiment is particularly suitable for designs based on bearingless motor principles, where one winding generates the drive field and one winding generates the control field. The coils for generating the drive field are generally referred to as drive coils, while the coils for generating the control field are referred to as control coils, and the currents applied in these windings are referred to as drive current and control current. For example, one winding may be used as a drive coil and the other winding may be used as a control coil. Thus, the drive field, which is an electromagnetic rotating field, is generated by the entirety of all the drive coils, and the control field, which is also an electromagnetic rotating field, is generated by the entirety of the control coils and superimposed on the drive field. As a result of the superposition of the drive field and the control field, tangential forces can then be generated on the rotor 30, which generate a torque for driving the rotation, as well as any adjustable transverse forces in the radial plane, whereby the position of the rotor 30 in the radial plane can be actively adjusted. In another alternative embodiment, the windings in the stator assembly 10 are double windings, that is, two windings, namely, a first winding 12 and a second winding 13, are respectively disposed on the main body 112 of each stator core 11, as shown in fig. 15. Wherein one of the first windings 12 corresponds to one main body 112, one of the second windings 13 corresponds to two adjacent main body 112, and the size of the second winding 13 is larger than the size of the first winding 12. In this embodiment, the first winding 12 generates a control field and the second winding 13 generates a drive field. The coils for generating the control field are called control coils, whereas the coils for generating the drive field are generally called drive coils, and the currents applied in these windings are called control current and drive current. For example, the first winding 12 may be used as a control coil and the second winding 13 may be used as a drive coil. Thus, the drive field, which is an electromagnetic rotating field, is generated by the entirety of all the drive coils, and the control field, which is also an electromagnetic rotating field, is generated by the entirety of the control coils and superimposed on the drive field. As a result of the superposition of the drive field and the control field, tangential forces can then be generated on the rotor 30, which generate a torque for driving the rotation, as well as any adjustable transverse forces in the radial plane, whereby the position of the rotor 30 in the radial plane can be actively adjusted.

The present application also provides a magnetic levitation pump 40 comprising the stator assembly 10 of the magnetic levitation pump 40 described above. The magnetically levitated pump 40 further comprises a rotor 30. In such an embodiment, the rotor 30 may be an inner rotor or an outer rotor. As shown in fig. 15, the rotor 30 is disposed inside the stator assembly 10, and the rotor 30 is an inner rotor. When the rotor 30 is an inner rotor, the protruding portion 113 of the stator core 11 extends toward the rotation axis adjacent to the rotor 30. When the rotor 30 is an outer rotor, the protruding portion 113 of the stator core 11 extends away from the rotation axis of the rotor 30. When the magnetic suspension pump 40 is in a working state, the stator assembly 10 can drive and support the rotor 30 in a non-contact geomagnetic manner in a running state, so that air gaps between the rotor 30 and the plurality of stator cores 11 are consistent, namely, the circle center of the rotor 30 in stable rotation is the same as the circle center of a circle formed by the endpoints of the stator cores 11.

The present application also provides a turbine assembly including the above-described magnetic levitation pump 40.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.

Claims

1. A stator assembly for a magnetic levitation pump, the stator assembly comprising: a plurality of stator cores are provided with a plurality of stator cores,

the stator core comprises a plurality of lamination sheets which are mutually overlapped along the lamination direction, wherein each lamination sheet comprises a first part extending along a first length direction and a second part extending along a second length direction and connected with the first part, and the first length direction and the second length direction are perpendicular to the lamination direction and mutually intersected;

2. The stator assembly of a magnetic levitation pump of claim 1, wherein the end face of the protrusion has a centerline parallel to the first length direction, the end face being symmetrical with respect to the centerline.

3. The stator assembly of a magnetic levitation pump of claim 2, wherein the plurality of laminations comprises N groups of laminations stacked on top of each other along the stacking direction, two adjacent groups of laminations being unequal in length along a second length direction, wherein N is greater than or equal to 3 and is an odd number.

4. The stator assembly of a magnetic levitation pump according to claim 3, wherein the plurality of laminations includes n groups of laminations having unequal lengths along the second length direction, the lengths of the n groups of laminations along the second length direction decreasing in sequence toward the main body portion in the lamination direction,

n is more than or equal to 2 and is an integer.

5. The stator assembly of a magnetic levitation pump according to claim 4, wherein a group of laminations having the shortest length along the second length direction is defined as a first group of laminations, n-1 groups of laminations are respectively provided on both sides of the first group of laminations in the lamination direction, and the lengths of the n-1 groups of laminations along the second length direction decrease in sequence toward the main body portion;

6. The stator assembly of a magnetic levitation pump according to claim 5, wherein the plurality of stator cores are arranged in a circumferential direction and the inner circumferential sides thereof are located on the same circular surface.

7. The stator assembly of a magnetic levitation pump of claim 4, wherein two adjacent groups of laminations having unequal lengths along a second length direction have equal length differences in the second length direction.

8. A stator assembly for a magnetic levitation pump according to claim 5 or 7, wherein the number of laminations in the n groups of laminations having unequal lengths along the second length direction is different, and the number of laminations in the n groups of laminations in the stacking direction is sequentially increased or decreased in a direction approaching the projection.

9. The stator assembly of a magnetic levitation pump of claim 1, wherein the stator core comprises a plurality of laminations stacked on top of each other in a stacking direction, each lamination being made of a soft magnetic material.

10. The stator assembly of a magnetic levitation pump according to claim 1, wherein each lamination is provided with a lamination structure, each adjacent two laminations are laminated with each other through the lamination structure,

11. The stator assembly of a magnetic levitation pump of claim 10, wherein the plurality of laminations comprise:

12. The stator assembly of a magnetic levitation pump of claim 11, wherein the staking protrusion is a circular protrusion protruding in the staking direction and the staking recess is a circular recess recessed in the staking direction.

13. The stator assembly of a magnetic levitation pump of claim 11, wherein the lamination protrusion is a V-shaped protrusion protruding in the lamination direction, and the lamination groove is a V-shaped groove recessed in the lamination direction.

14. The stator assembly of a magnetic levitation pump of claim 11, wherein the plurality of laminations further comprise:

15. The stator assembly of a magnetic levitation pump of claim 11, wherein the standoff protruding from the one standoff surface is less than or equal to the recessed distance of the standoff recess into the other standoff surface.

16. The stator assembly of a magnetic levitation pump of claim 1, wherein each lamination has an L-shape, and a tip of the first portion of the lamination remote from the second portion is designed as a chamfer or a rounded corner in the second length direction.

17. The stator assembly of a magnetic levitation pump of claim 1, wherein the stator core comprises a progressive molded lamination.

18. The stator assembly of a magnetic levitation pump of claim 1, further comprising a plurality of windings, at least one winding disposed on a body portion of each of the stator cores.

19. A magnetically levitated pump comprising a stator assembly according to any of claims 1-18, a rotor, the stator assembly being capable of contactless geomagnetic driving and supporting the rotor in an operational state.

20. A turbine assembly comprising the magnetically levitated pump of claim 19.