CN220775504U - Disc motor stator convenient to production and disc motor and centrifugal pump applying same - Google Patents

Abstract

The utility model provides a disc type motor stator convenient to produce, which comprises an iron core, a coil assembly and a plastic package, wherein the coil assembly comprises a plurality of cylindrical coil frameworks and coils wound on the coil frameworks one by one, the iron core comprises a first iron core part and a plurality of second iron core parts, the first iron core part is provided with an annular strip-shaped yoke part, and the yoke part is formed by winding strip-shaped steel strips; the second core part consists of a plurality of iron cores which are the same as the sleeve in number and are in a T shape along the axial direction, and the plastic package shell wraps the iron cores and the coil assembly but exposes the upper end face of the pole shoe part of the iron core. The first core part of the disc motor stator is only composed of an annular strip-shaped yoke part, the yoke part is directly wound and formed by adopting strip steel strips, the process is simple, the production is convenient, and no waste materials are generated by stamping and forming. In addition, the utility model also provides a disc motor and a centrifugal pump.

Description

Disc motor stator convenient to production and disc motor and centrifugal pump applying same

Technical Field

The utility model relates to a disk motor stator and a disk motor which are convenient to produce, and IPC classifications can be H02K 1/14, H02K 1/16, H02K 1/26 and H02K 1/27.

Background

The prior art discloses a low-power disc motor stator, such as chinese patent CN218243144U, which is formed by splicing a second core portion and a first core portion to form an integral stator core, before splicing, a coil assembly wound with a coil is sleeved into a tooth portion of the second core portion or the first core portion, winding is simply put down, then the stator assembly formed after splicing is an insert, a plastic package is formed on the outer surfaces of the core and the coil assembly, and axial displacement of the first core portion and the second core portion is limited to be tightly attached.

The first core part and the second core part of the disc motor stator are respectively provided with a tooth part, and when the disc motor stator is manufactured by adopting a strip steel strip winding process, the waste loss between teeth is large.

For terms and common general knowledge, except as indicated in the specification, reference may be made to "mechanical engineering handbook" and "motor engineering handbook" (written group, 1997 nd edition 2 of mechanical industry Press), chinese national standard GB/T2900.25-2008 "Electrical term rotating Electrical machine", and Chinese patent CN218243144U "a low-power disk-type motor stator and disk-type motor", publication No. 2023, 01 and 06.

Disclosure of Invention

The utility model aims to solve the problems in the prior art and provide a disc type motor stator convenient to produce, which comprises an iron core, a coil assembly and a plastic package, wherein the coil assembly is in a ring column shape and comprises a plurality of column-shaped coil frameworks and coils wound on the coil frameworks one by one, the center of the coil frameworks is provided with a sleeve which is penetrated in the axial direction, the iron core comprises a first iron core part and a plurality of second iron core parts, the first iron core part consists of an annular strip-shaped yoke part, and the yoke part is formed by winding strip-shaped steel strips; the second core part is composed of a plurality of iron cores which are the same in number with the sleeve and are in T-shaped along the axial direction, the T-shaped iron cores are formed by laminating steel sheets through stamping, each T-shaped iron core comprises a tooth part and pole shoe parts which are widened along two sides at the upper ends of the tooth parts, the first iron core part is arranged at one end of the coil assembly, the second core part is inserted into the sleeve of the coil framework through the tooth parts of the second core part at the other end of the coil assembly, the bottom ends of the tooth parts are in close contact with the yoke parts, and the plastic package wraps the iron cores and the coil assembly, but the upper end faces of the pole shoe parts are exposed.

The disc motor stator is characterized in that the first core part consists of only one annular strip-shaped yoke part, the yoke part is directly wound and formed by adopting strip steel strips, the process is simple, the production is convenient, and no waste materials are generated by stamping and forming; the lower end of the tooth part of the second core part is directly abutted against the yoke part of the first core part to form an iron core, a plastic package shell is formed on the outer surfaces of the iron core and the coil assembly, the axial displacement of the first core part and the second core part is limited, gaps are avoided, and the stator iron core has good magnetic conductivity.

Preferably, the plurality of coil bobbins are integrally injection-molded into an annular cylinder, and an annular connecting portion is provided at one axial end thereof. The design ensures that the coil component has good roundness, can form an ideal electromagnetic field and has good electromagnetic performance. In addition, each independent second iron core part is inserted into the sleeve of each coil framework through the tooth part, the second iron core part and the coil assembly form an integral round piece, the second iron core part and the first iron core part are conveniently placed into the die cavity injection molding shell concentrically, and the roundness of the coil assembly and the concentricity of the iron core can be ensured.

Preferably, a plurality of straight strip-shaped bodies which are mutually connected and distributed in a chain type are formed by adopting one-time injection molding, the coil frameworks are wound and then are coiled into a coil assembly, and the chain type straight strip-shaped coil frameworks are easy to wind enameled wires and are convenient for automatic production. Similarly, each independent second iron core part is inserted into the sleeve of each coil framework through the tooth part, the second iron core part and the coil assembly form an integral round piece, the second iron core part and the first iron core part are conveniently placed into the die cavity injection molding plastic package in a concentric manner, and the roundness of the coil assembly and the concentricity of the coil assembly and the iron core can be ensured.

Further, the outer edge of one end of the first iron core part is provided with a radial limit convex rib of the first iron core part, the inner side of the convex rib is provided with an arc-shaped surface with the radius equal to or slightly larger than the outer peripheral radius of the first iron core part (101), and the top end of the convex rib is provided with a second clamping hook. Therefore, the pole shoe part of the second core part, the second clamping hook and the convex rib can axially fix the first core part and the second core part to the coil assembly, so that the stator assembly (comprising the core and the coil assembly) before plastic packaging is conveniently and subsequently put into a mould as a whole to be injection-molded to form a plastic package shell, and the production efficiency is improved.

Preferably, the upper end surface of the yoke portion is radially provided with a plurality of dovetail-shaped grooves along the circumference, and the tooth portion of the second core portion (the lower end surface is protruded to form dovetail-shaped protruding portions, and the second core portion is fixed to the grooves by protruding portion insertion.

Therefore, the second core part and the first core part are fixedly formed into an integral round iron core, each coil assembly is sleeved on the tooth part of the second core part through the sleeve, the roundness of the coil assembly and the concentricity of the coil assembly and the iron core can be ensured, an integral plastic package front stator assembly is formed, the subsequent placement into a die cavity injection molding plastic package is facilitated, and the production efficiency is improved.

Preferably, the side surface of the pole shoe part is provided with a concave structure which is narrowed towards the center direction of the pole shoe part, and the plastic package shell is provided with an inverted buckle structure formed by injection molding between every two adjacent pole shoe parts of the second iron part in the circumferential direction. The inverted structure ensures that the steel layers of the iron core cannot be staggered in an up-down layering manner, and the problem that the first iron core part and the second iron core part are not tightly attached to each other can be avoided, so that the stator iron core has good magnetic conductivity.

Preferably, the second core part is formed by stacking steel sheets having pole shoe parts of the same width and tooth parts of the same width. The design only needs to punch steel sheets with one shape and size, and has simple process and high production efficiency.

Preferably, the pole shoe portion of the second core portion is formed by laminating a plurality of steel sheets having different widths, and the pole shoe portion on the outer peripheral side is wider and the pole shoe portion on the inner peripheral side is narrower.

Further, the second core part tooth part is formed by laminating a plurality of sections of steel sheets with different widths, the tooth part on the outer circumference side is wider, and the tooth part on the inner circumference side is narrower.

The design is beneficial to reducing the pulsation electromagnetic wave, and the proper number of segments is beneficial to balancing and improving the adverse effect of tooth harmonic wave and the effect of productivity reduction.

The utility model also provides a disk motor, which comprises a rotor, a rotor cylinder for accommodating the rotor, a motor end cover for closing the rotor cylinder, and the stator, wherein the stator and the rotor are arranged up and down to form axial magnetic coupling.

The utility model also provides a centrifugal pump, which comprises a pump cover provided with a suction inlet and a discharge outlet, an impeller and the disc-type motor, wherein the impeller is fixed at the top end of a rotating shaft of the disc-type motor, and the pump cover is fixedly connected to the upper end of the disc-type motor and is watertight sealed with a motor end cover of the disc-type motor to form an impeller cavity for accommodating the impeller.

Drawings

Fig. 1 is an exploded view of the present utility model prior to plastic encapsulation of a disc motor stator.

Fig. 2 is a schematic structural diagram of the disc motor stator of the present utility model before plastic packaging.

Fig. 3 is a schematic structural view of a stator of a disc motor according to the present utility model.

Fig. 4a is a schematic structural view of one of the bobbins of the disc motor stator of the present utility model.

Fig. 4b is a schematic structural view of a second coil bobbin of the stator of the disk motor of the present utility model.

Fig. 4c is a schematic diagram of a structure of the coil bobbin of the disc motor stator of the present utility model after two windings are wound.

Fig. 5 is a schematic structural view of one of the first core portions of the disc motor stator of the present utility model.

Fig. 6 is a schematic structural view of one of the second core portions of the disc motor stator of the present utility model.

Fig. 7 is a schematic structural view of a second core portion of the disc motor stator of the present utility model.

Fig. 8 is a schematic view of the structure of the third second core portion of the disk motor stator of the present utility model.

Fig. 9 is a partial circumferential cross-sectional view of the disc motor stator of the present utility model after plastic encapsulation.

Fig. 10 is a partial enlarged view of fig. 9.

Fig. 11 is a schematic structural view of a fourth core portion of the disc motor stator of the present utility model.

Fig. 12 is a schematic structural view of a second core portion of the disc motor stator of the present utility model.

Fig. 13 is a cross-sectional view of a tooth portion of the second core portion of fig. 12.

Fig. 14 is an axial cross-sectional view of the disc motor of the present utility model.

Fig. 15 is an axial cross-sectional view of a centrifugal pump of the present utility model.

Reference numerals:

the iron core 10, the first iron core part 101, the yoke part 1011, the groove 1012, the second iron core part 102, the pole shoe part 1022, the tooth part 1023, the recessed structure 1024, the protruding part 1025, the coil component 20, the coil bobbin 201, the sleeve 2011, the connection part 2012, the notch 2013, the first hook 2014, the arc surface 2015, the second hook 2016, the protruding rib 2017, the coil 202, the plastic package front stator component 1020, the plastic package 30, the back-off structure 301, the bottom 302, the outer peripheral part 303 and the inner peripheral part 304, the stator 100, the rotor 200, the permanent magnet 2001, the rotating shaft 2002, the rotor cylinder 300, the motor end cover 400, the impeller 500, the impeller cavity 600, the pump cover 700, the suction inlet 7001, and the discharge outlet 7002.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. In describing the apparatus, system, device, and structure of the present utility model, the side where the core yoke is located is referred to as the lower side or lower side, and the opposite side is referred to as the upper side or upper side. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

The following describes the technical solution in the embodiments of the present utility model clearly and completely with reference to specific embodiments. As shown in fig. 1 to 3, the disc motor stator 100 of the present embodiment includes a core 10, a coil assembly 20, and a plastic housing 30 injection-molded to the outer surfaces of the core 10 and the coil assembly 20. Wherein, as shown in fig. 1, the iron core 10 is composed of a first iron core part 101 and a second iron core part 102, the first iron core part 101 is formed by winding steel strips, and has a ring yoke 1011 but no protruding tooth part; the second core 102 is composed of a plurality of circumferentially arranged "T-shaped" cores formed by laminating stamped steel sheets, each of the "T-shaped" cores includes a pole shoe 1022 and a tooth 1023 protruding downward from the center of the pole shoe 1022, and the width of the tooth 1023 is smaller than the width of the pole shoe 1022.

As shown in fig. 1, the coil assembly 20 includes a plurality of cylindrical bobbins 201 circumferentially arranged and coils 202 wound around the middle section of the outer surface of each bobbin 201, where the bobbins 201 are formed by injection molding of an insulating material to form a structure with two protruding ends and a concave middle section, so that the coils 202 wound around the middle section can be limited, a sleeve 2011 is disposed at the center of the bobbins 201, and the number of the sleeves 2011 is the same as the number of the T-shaped cores of the second core 102.

As shown in fig. 2, the plastic-sealed front stator assembly 1020 includes a coil assembly 20 and an iron core 10, the iron core 10 includes a first iron core portion 101 and a second iron core portion 102, wherein the first iron core portion is disposed at one end of the coil assembly 20, each second iron core portion 102 is respectively inserted into a sleeve 2011 of each coil bobbin 201 through a tooth portion 1023 at the other end of the coil assembly 20, and the tooth portion 1023 of the second iron core portion is in contact with a yoke portion 1011 of the first iron core portion.

Further, in order to maintain the core 10 and the coil block 20 circular and have better concentricity. One possible embodiment is shown in fig. 4a, where each cylindrical bobbin 201 arranged along the circumference is integrally injection-molded into an annular cylinder, and one axial end of the annular cylinder is provided with a connection portion 2012 that connects each bobbin 201 to each other as a whole, and the connection portion 2012 is an annular connection rib. As shown in fig. 4b and 4c, a plurality of cylindrical bobbins 201 are integrally injection-molded into a straight bar body in a chain distribution, which is connected to each other, and after winding a coil 202 around the sleeve 2011 of each bobbin 201, the bobbins 201 may be wound into a toroidal coil assembly 20. Specifically, a fastening structure fastened to each other is disposed on the outer side of the chain coil skeleton, as shown in fig. 4b, a notch 2013 on the right side of the chain coil skeleton and a first hook 2014 on the left side, and when the chain coil skeleton is rounded, the first hook 2014 on the left side is fastened to the notch 2013 on the right side to form the stable ring column. Thus, when the independent second core portions are inserted into the sleeves 2011 (tightly-matched insertion) of the coil framework 201 in a one-to-one correspondence manner through the tooth portions 1023, an integral round piece is formed with the coil assembly 20, so that the second core portions and the first core portions 101 can be conveniently placed into the die cavity injection molding package 30 concentrically; in another possible embodiment, as shown in fig. 5 and 6, a plurality of dovetail-shaped grooves 1012 may be radially arranged along the circumference on the upper end surface of the yoke 1011 of the first core portion, dovetail-shaped protrusions 1025 are formed at the lower end of the teeth 1023 of each second core portion, the second core portions are inserted into the grooves 1012 through the protrusions 1025 to form an integral circular member with the first core portion 101, and each independent coil bobbin 201 (after winding) is sleeved on the teeth 1023 of the second core portion through a sleeve 2011, so that an integral circular plastic package front stator assembly 1020 may be formed by the coil assembly 20 and the core 10, the roundness and concentricity of the core 10 and the coil assembly 20 may be ensured, the subsequent placement into the cavity plastic package 30 is facilitated, and the production efficiency is improved.

As further shown in fig. 4b and 4c, a protruding rib 2017 for radially limiting the first core part 101 may be disposed at an outer edge of one end of a part of the coil frame 201, an arc surface 2015 with a radius equal to or slightly larger than an outer circumference radius of the first core part 101 is disposed at an inner side of the protruding rib 2017, a second hook 2016 is disposed at a top end of the protruding rib 2017, after each coil frame 201 is rounded, the independent second core part 102 is inserted into a sleeve 2011 of the coil frame 201 in a one-to-one correspondence manner through the tooth part 1023, the annular first core part 101 is disposed at one end of the coil frame 201 provided with the protruding rib 2017, an upper end surface of a yoke part of the annular first core part is attached to the tooth part 1023 of the second core part, the second hook 2016 axially limits the first core part 101, and the arc surface 2015 at the inner side of the protruding rib 2017 radially limits the first core part 101. In this way, the first core portion 101 and the second core portion 102 are axially fixed to the coil assembly 20 via the pole shoe portion 1022 and the second hook 2016 of the second core portion, and the ribs 2017, so that the plastic-packaged front stator assembly 1020 (including the core 10 and the coil assembly 20) is conveniently put into a mold as a whole for injection molding to form the plastic package 30.

As shown in fig. 3 and 9, the plastic package 30 is formed by injection molding a plastic package front stator assembly 1020 (including the core 10 and the coil assembly 20) as an insert, and a mold (not shown) presses the first core portion 101 and the second core portion 102 during injection molding so that the first core portion 101 and the second core portion 102 are closely attached to each other, and in general, the plastic package 30 has: a bottom portion 302 of the annular yoke 1011 covering the first core portion from the lower side; the plastic package 30 covers the coil assembly 20 and the remaining portion of the core 10 except for the upper end surface of the pole shoe 1022 of the second core portion, as a whole, by covering the outer peripheral portion 303 and the inner peripheral portion 304 of the coil 202 and the bobbin 201 extending upward from the bottom.

To enhance the reliability of the plastic package 30 in limiting the displacement of the core, a recessed structure 1024 with a narrowed width may be provided on the side surface of the pole shoe 1022, and the recessed structure 1024 may be a step recessed toward the center of the pole shoe 1022 at the upper section of the side surface as shown in fig. 1 and 6; or as shown in fig. 7, a recess in the middle of the side; or as shown in fig. 8, a slope from bottom to top toward the center of pole piece 1022. In this way, the plastic package 30 forms the back-off structure 301 between every two adjacent pole shoe parts 1022 in the circumferential direction during injection molding, as shown in fig. 9 and 10, the back-off structure 301 is formed by filling the space between the adjacent pole shoe part concave structures 1024 with plastic during injection molding, the back-off structure 301 ensures that the steel layers of the iron core cannot be staggered in a layered manner, and the problem that the first iron core part 101 and the second iron core part 102 are not tightly attached can be avoided, so that the stator iron core has good magnetic conductivity.

In order to simplify the production process and improve the production efficiency, as shown in fig. 11, a possible embodiment is that the second core 102 is formed by laminating steel sheets having the same width in the pole shoe 1022 and the same width in the tooth 1023, and the shape and the size of each layer of steel sheet are consistent, so that the production is simplified and the efficiency is high. As shown in fig. 12 and 13, the second core 102 of another possible embodiment is formed by laminating 3 pieces of steel sheets with different widths, the pole shoe of the outer peripheral portion is wider, the pole shoe of the inner peripheral portion is narrower, and further, the teeth are also formed by laminating 3 pieces of steel sheets with different widths, and as such, the teeth of the outer peripheral portion are wider, and the teeth of the inner peripheral portion are narrower, which is advantageous for reducing the pulsating electromagnetic wave. For specific products, the shape and the segmentation number with better effect, such as 4, 5, 6 segments and the like, can be obtained through electromagnetic calculation, experiments and simulation, and the proper segmentation number is beneficial to balance and improve the adverse effect of tooth harmonic waves and the effect of productivity reduction.

Preferably, the plastic enclosure 30 is formed from a bulk molding compound (Bulk Molding Compound, BMC). In the present embodiment, the plastic package 30 is formed by disposing the plastic package front stator assembly 1020 in a mold, injecting a BMC resin into the mold, and curing the BMC resin.

As shown in fig. 14, a rotor cylinder 300 is fixedly connected to the upper end and the inner side of the stator 100, the rotor cylinder 300 in this embodiment is an independent injection molding piece, which may be fixed to the stator 100 by using a conventional mechanical connection manner such as fastening, screwing, welding, etc., and in other embodiments, the stator assembly 1020 (including the core 10 and the coil assembly 20) may be molded as an insert with the plastic housing 30 integrally or the stator 100 may be molded as an insert by two-shot molding. The motor end cover 400 is fixedly connected to the upper end of the rotor barrel 300, and forms a rotor cavity for accommodating the rotor 200 with the rotor barrel 300, the column part on the inner side of the rotor 200 is fixedly connected with the rotating shaft 2002, the permanent magnets 2001 corresponding to the number of the coils 202 are fixed on the outer edge of the disk-shaped part of the rotor 200, and the radial positions of the permanent magnets 2001 correspond to the pole shoe parts 1022 of the second core part. Thus, the stator 100 and the rotor 200 are arranged up and down to form axial magnetic coupling, and the stator coil magnetic field drives the rotor 200 to rotate. Other structures of the motor are similar to those of the disk motor of the prior art and are not described in detail herein.

The present utility model also provides a centrifugal pump, as shown in fig. 15, in which an impeller 500 is fixed to the top end of the rotating shaft of the disc motor, a pump cover 700 is fixedly connected to the upper end of the disc motor, and an impeller chamber 600 (also a pumping chamber) for accommodating the impeller 500 is formed in watertight sealing with the motor end cover 400. The pump cover is provided with a suction inlet 7001 for liquid to flow in and a water discharge outlet 7002 for liquid to discharge, and after the liquid enters the impeller cavity 600 from the suction inlet 7001, the liquid is driven to be discharged through the water discharge outlet 7002 by the impeller driven to rotate by the motor shaft.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. The utility model provides a disc motor stator (100) convenient to production, includes iron core (10), coil pack (20) and plastic envelope (30), iron core (10) include first core (101) and a plurality of second core (102), characterized in that, coil pack (20) are the loop column form, including a plurality of coil bobbins (201) and coil (202) of winding at coil bobbin (201) one by one, coil bobbin (201) center is equipped with axial through sleeve (2011), a plurality of coil bobbins (201) are the intercoupled straight strip body of being chain of injection molding formation as an organic whole, form the loop column after the circle is rolled up; the first core part (101) is provided with an annular strip-shaped yoke part (1011), and the yoke part (1011) is formed by winding strip-shaped steel strips; the second core part (102) consists of a plurality of T-shaped iron cores which are the same in number as the sleeve (2011) and are in a T shape along the axial direction, the T-shaped iron cores are manufactured by stamping and formed steel sheet lamination and comprise tooth parts (1023) and pole shoe parts (1022) which are widened along two sides at the upper end of the tooth parts (1023); the first core part (101) is placed at one end of the coil assembly (20), the second core part (102) is inserted into a sleeve (2011) of the coil framework (201) at the other end of the coil assembly (20) through a tooth part (1023), the bottom end of the tooth part (1023) is in close contact with a yoke part (1011), the plastic package (30) is formed by insert injection molding of an iron core (10) and the coil assembly (20), and the iron core (10) and the coil assembly (20) are wrapped by the plastic package but the upper end face of the pole shoe part (1022) is exposed.

2. A disc motor stator according to claim 1, characterized in that the outer edge of the part of the coil skeleton (201) at the end where the first core part (101) is arranged is provided with a protruding rib (2017) for radially limiting the first core part (101), the inner side of the protruding rib (2017) is provided with an arc-shaped surface (2015) with a radius equal to or slightly larger than the outer peripheral radius of the first core part (101), and the top end of the protruding rib (2017) is provided with a second clamping hook (2016).

3. A disc motor stator according to claim 1, wherein the upper end surface of the yoke (1011) is radially provided with a plurality of dovetail-shaped grooves (1012) along the circumference, the lower end surface of the tooth portion (1023) of the second core portion (102) is protruded to form dovetail-shaped protruding portions (1025), and the second core portion (102) is inserted into the grooves (1012) with the protruding portions (1025) to be fixed.

4. A disc motor stator according to claim 1, characterized in that the side surfaces of the pole shoe parts (1022) are provided with concave structures (1024) narrowing towards the center direction of the pole shoe parts, and the plastic package (30) is provided with inverted structures (301) formed by injection molding between every two adjacent pole shoe parts (1022) of the second core part (102) in the circumferential direction.

5. A disc motor stator according to claim 1, characterized in that the laminated steel sheets of the second core part (102) have pole shoe parts (1022) of the same width and tooth parts of the same width.

6. A disc motor stator according to claim 1, characterized in that the pole shoe part (1022) of the second core part (102) has several sections of different widths, the pole shoe part on the outer circumference side being wider and the pole shoe part on the inner circumference side being narrower.

7. A disc motor stator according to claim 6, characterized in that the teeth (1023) of the second core part (102) have several different widths, the teeth on the outer peripheral side being wider and the teeth on the inner peripheral side being narrower.

8. A disk motor comprising a rotor (200), a rotor cartridge (300) accommodating the rotor and a motor end cap (400) closing the rotor cartridge (300), characterized in that it further comprises a stator (100) according to any one of claims 1 to 7, said stator (100) and rotor (200) being arranged one above the other to form an axial magnetic coupling.

9. A centrifugal pump comprising a pump cover (700) provided with a suction inlet (7001) and a discharge outlet (7002), and an impeller (500), and further comprising the disc motor according to claim 8, wherein the impeller (500) is fixed on the top end of a rotating shaft (2001) of the disc motor, and the pump cover (700) is fixedly connected to the upper end of the disc motor, and forms an impeller cavity (600) for accommodating the impeller (500) with a motor end cover (400) of the disc motor in a watertight manner.