CN215566666U

CN215566666U - Cutting pump driven by squirrel-cage embedded disc type composite self-starting permanent magnet synchronous motor

Info

Publication number: CN215566666U
Application number: CN202120577698.9U
Authority: CN
Inventors: 黄诚; 周磊
Original assignee: Huanyi Electromagnetic Technology Yichang Co ltd
Current assignee: Huanyi Electromagnetic Technology Yichang Co ltd
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2022-01-18
Anticipated expiration: 2031-03-22

Abstract

The utility model discloses a cutting pump driven by a squirrel-cage embedded disc type composite self-starting permanent magnet synchronous motor, which comprises a base, a pump body, an impeller, a pump cover, a support frame, a casing and a rotor shaft, wherein a column type rotor assembly and a disc type rotor assembly, as well as a column type stator assembly and a disc type stator assembly which are arranged in the casing are respectively sleeved on the rotor shaft; one end of the rotor shaft, which is far away from the column type rotor assembly, sequentially penetrates through the support frame and the pump cover and extends into the pump body to be connected with the impeller, and the tail end of the rotor shaft extends into the base and is connected with a reamer; the cutting pump has excellent driving performance and strong power output, can be used in various working conditions requiring self-starting, compact structure and high synchronization performance, has no intermediate conversion link, and a plurality of rotors directly act on the rotor shaft to drive the impeller to rotate together, and has the advantages of large rotating thrust, large output torque and high motor efficiency.

Description

Cutting pump driven by squirrel-cage embedded disc type composite self-starting permanent magnet synchronous motor

Technical Field

The utility model relates to the technical field of cutting pumps, in particular to a cutting pump driven by a squirrel-cage embedded disc type composite self-starting permanent magnet synchronous motor.

Background

The cutting pump is one kind of blowdown type water pump, compares in ordinary dredge pump, and the cutting pump structurally has some differences, and the bottom of fuselage has a set of high strength cutting formula blade, can easily cut up debris such as fibre, excrement and urine, branch, need not the manual work to go scum and suspended solid in the clearance hole, has practiced thrift municipal administration and engineering spending.

The cutting pump can cut sundries during normal operation, but when the pump is started, the pump is often broken down due to insufficient starting torque, a motor is burnt down when the pump is serious, and the failure rate is high. Chinese utility model patent (publication No. CN209593159U) discloses in 2019 a motor device for a cutting pump, comprising a motor base, a driving mechanism, an operating capacitor, a starting capacitor, a lower bearing seat, a wire outlet cover, a volute and an electronic switch, wherein a cavity of the motor base is filled with cooling oil, the driving mechanism oil is immersed in the cooling oil in the motor base, the motor device adopts a built-in oil-immersed single-phase double-value capacitor motor, which can self-start and improve the starting torque, but the oil-immersed motor has high requirements for sealing and needs to periodically replace oil; in addition, the motor improves the starting torque, but the improvement degree is limited, and the motor also has defects in continuous power output and synchronous rotation after starting.

Disclosure of Invention

The utility model aims to provide a cutting pump driven by a squirrel-cage embedded disc type composite self-starting permanent magnet synchronous motor, aiming at the problems in the prior art.

In order to achieve the purpose, the utility model adopts the technical scheme that:

the cutting pump driven by the squirrel-cage embedded disc type composite self-starting permanent magnet synchronous motor comprises a base, wherein a pump body is arranged on the base, an impeller is arranged in the pump body, a pump cover is arranged above the pump body, a support frame is connected above the pump cover, a shell is arranged above the support frame, a rotor shaft is arranged in the shell, a column type rotor assembly and at least one group of disc type rotor assemblies are respectively sleeved on the rotor shaft, and the column type stator assembly and the disc type stator assembly are arranged in the shell and correspond to the column type rotor assemblies; the column type rotor assembly comprises a column type rotor sleeved on the rotor shaft, first permanent magnet magnetic shoes are axially embedded in the periphery of the column type rotor, a squirrel cage structure is installed on the periphery of the column type rotor, and a gap is kept between the periphery of the squirrel cage structure and the inner periphery of the column type stator assembly; the disc rotor assembly comprises a disc rotor sleeved on the rotor shaft, a second permanent magnet magnetic shoe is embedded on the end face of the disc rotor, and the second permanent magnet magnetic shoe and the end face of the disc stator assembly are correspondingly arranged and keep a gap; one end of the rotor shaft, which is far away from the column type rotor assembly, sequentially penetrates through the support frame and the pump cover and extends into the pump body to be connected with the impeller, and the tail end of the rotor shaft extends into the base and is connected with a reamer.

The cutting pump is excellent in driving performance and strong in power output, can be used in various working conditions requiring self-starting, compact in structure and high in synchronization performance requirement, reduces the arrangement of a reduction gear, a complex transmission system and a lubricating system, has no intermediate conversion link, and is characterized in that a plurality of rotors directly act on a rotor shaft to drive an impeller to rotate together, the rotary thrust is large, the output torque is large, the motor efficiency is high, and the rotating speed is easy to control. When the permanent magnet synchronous motor is powered on, the first permanent magnet magnetic shoe and the second permanent magnet magnetic shoe respectively provide a radially rotating magnetic field for the corresponding stator assembly, so that the stator assembly respectively provides axial rotation torque for the corresponding column rotor and the corresponding disc rotor, the rotor shaft, the impeller and the reamer are directly driven to work under the common acting force, and the cutting pump with high power requirement can be met.

The rotor shaft is a multistage stepped rotating shaft, only one rotor shaft is needed for the whole cutting pump, a shaft coupling and shaft connecting part with the same axis is not needed in the middle, the driving force generated by a plurality of motors can be directly transmitted to the impeller and the reamer, the capacity loss is small, and the impeller and the reamer have large force and synchronous rotation capacity.

Adopt the rotor subassembly of two kind at least structure types, can utilization by great degree limited space in the casing under the condition that does not increase axial dimensions by a wide margin, just can arrange a plurality of motors, the stack of a plurality of motors can provide bigger rotary thrust, is favorable to the high-efficient work of cutting pump. The motor with the column structure is used as main output, the motor with the disc structure is used as auxiliary output, and the two are complementary, so that the high output is ensured, and the rotation stability of the rotor shaft can be ensured.

The cylindrical rotor assembly with the embedded squirrel cage has the advantages of simple structure, firmness, durability, reliable operation, convenience in maintenance and the like, and the first permanent magnet magnetic shoe is directly embedded into the cylindrical rotor, so that the circumferential space occupied by the permanent magnet magnetic shoe can be reduced, and the radial size of the motor is reduced.

Furthermore, the squirrel-cage structure comprises a first annular end part, a second annular end part and a plurality of cage ribs arranged between the first annular end part and the second annular end part, and the cage ribs are embedded on the outer peripheral wall of the column type rotor; at least one end of the squirrel cage structure is further connected with a pressing ring, the pressing ring is connected with the inner circumferential surface of the first annular end part and/or the second annular end part through a plurality of radial connecting rods, and the pressing ring is abutted to the end surface of the first permanent magnet magnetic shoe.

Further, the cage muscle sets firmly on the first annular tip, first annular tip butt sets up the lower extreme of column type rotor, second annular tip detachable spiro union is in the upper end of column type rotor, the clamping ring is connected first annular tip.

The compression ring can support and fix the first permanent magnet magnetic shoe, so that the axial movement of the first permanent magnet magnetic shoe can be reduced, and the installation stability of the first permanent magnet magnetic shoe is improved; the detachable second annular end part is convenient for the installation and the detachment of the squirrel cage structure, and the cross section of the cage rib is of a trapezoidal structure with a fillet, so that the circumferential shaking of the cage rib can be reduced, and the squirrel cage structure is prevented from moving relative to the column type rotor.

Furthermore, the first permanent magnet magnetic shoe is strip-shaped, and the adjacent first permanent magnet magnetic shoes are arranged in a V shape; the first permanent magnet magnetic shoes axially penetrate through the column type rotor and are close to the outer circumference of the column type rotor. The first permanent magnet magnetic shoes are arranged in a V shape, and magnetic poles are sequentially and alternately arranged, so that the formation of a magnetic field and the control of magnetic force are facilitated.

Furthermore, the second permanent magnet magnetic shoe is of a split type fan-shaped disc structure and is respectively attached to the upper end face of the disc rotor. The second permanent magnet magnetic shoe is fixed by industrial high-temperature magnetic shoe bonding glue, and has better bonding strength at high temperature; the split type arrangement is convenient for respectively installing and independently maintaining, and the arrangement can obtain the support of the disc rotor on the upper end face and is not easy to break away.

Further, the disc stator assembly comprises a disc stator core and a stator winding wound on the disc stator core; the outer periphery of the disc type stator iron core is fixed on the inner periphery of the shell in a threaded mode, and an axial through hole is formed in the middle of the disc type stator iron core and sleeved on the rotor shaft.

Further, the column stator assembly comprises a column stator core mounted on the inner periphery of the casing, and a stator winding wound on the column stator core; the axial dimension of the column type stator component is not less than that of the column type rotor component.

The disc type stator assembly and the column type stator assembly are independently installed inside the machine shell, can be independently installed and replaced, and are convenient to maintain in a later period.

Further, the support frame comprises a lower support end, an upper support end and a middle support; the lower support end is clamped with the pump cover and is in threaded connection and fixed, the upper support end is clamped with the shell and is in threaded connection and fixed, the middle support is provided with an inner support hole structure, and the rotor shaft penetrates through the inner support hole structure and is provided with a plurality of bearings between the rotor shaft and the inner support hole structure; a cavity is formed between the lower portion of the supporting frame and the pump cover, and a mechanical seal is arranged between the rotor shaft and the pump cover.

The support frame with the structure can play a better role of bearing up and down, and the lower support end, the upper support end and the middle support are respectively connected with and support one part, so that the structure is reasonable and the stability is good; the W-shaped cavity is useful in each place, and an oil chamber is not required to be arranged independently.

Furthermore, a gland is arranged above the machine shell, a motor cover is arranged above the gland, the gland is clamped and supported between the machine shell and the motor cover, and the machine shell is fixed through the motor cover in a threaded connection mode; an inner counter bore is arranged below the gland, the upper end part of the rotor shaft is sleeved in the inner counter bore, and a bearing is arranged between the upper end part of the rotor shaft and the inner counter bore; the gland with all be equipped with on the motor cover and walk the line hole.

The arrangement of the gland is convenient for connecting the rotor shaft and the junction box, the gland is fixed in a clamping mode without independent screw connection, and the motor cover can be fixed to fix the gland, so that the motor cover is more convenient.

Furthermore, the pump body is clamped and fixed on the base in a threaded manner, an axial through hole is formed in the middle of the base, the rotor shaft penetrates through the axial through hole and is connected with the reamer at the axial through hole, and the reamer is sleeved on the rotor shaft and is provided with a locking nut on the outer side.

Compared with the prior art, the utility model has the beneficial effects that: 1. the cutting pump has excellent driving performance and strong power output, can be used in various working conditions requiring self-starting, compact structure and high requirement on synchronization performance, a plurality of rotors directly act on the rotor shaft to drive the impeller to rotate together, and has the advantages of large rotating thrust, large output torque and high motor efficiency; 2. the rotor shaft is a multi-stage stepped rotating shaft, the whole cutting pump only needs one rotor shaft, a part connected with the shaft by a shaft coupler and the like is not needed in the middle, the driving force generated by a plurality of motors can be directly transmitted to the impeller and the reamer, the capacity loss is small, and the impeller and the reamer have large force and synchronous rotating capacity; 3. the rotor assemblies with at least two structural types are adopted, the limited space in the shell can be utilized to a greater extent, a plurality of motors can be arranged under the condition that the axial size is not increased to a great extent, the superposition of the plurality of motors can provide greater rotary thrust, and the efficient work of the cutting pump is facilitated; 4. this embedded column type rotor subassembly of squirrel cage has advantages such as simple structure, sturdy and durable, operation are reliable, maintenance convenience, and the clamping ring can support and fix first permanent magnet magnetic shoe can reduce the axial displacement of first permanent magnet magnetic shoe improves the stability of first permanent magnet magnetic shoe installation.

Drawings

FIG. 1 is an overall schematic view of a squirrel cage embedded disc type composite self-starting permanent magnet synchronous motor driven cutting pump of the present invention;

FIG. 2 is a schematic diagram of a squirrel cage structure of a cutting pump driven by a squirrel cage embedded disc type composite self-starting permanent magnet synchronous motor according to the present invention;

FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a view taken along line B in FIG. 2;

FIG. 5 is a schematic structural diagram of a disc rotor assembly of a cutting pump driven by a squirrel-cage embedded disc type composite self-starting permanent magnet synchronous motor according to the present invention;

FIG. 6 is a schematic structural diagram of a cutting pump driven by another squirrel-cage embedded disc type composite self-starting permanent magnet synchronous motor according to the present invention;

in the figure: 1. a base; 2. a pump body; 3. an impeller; 4. a pump cover; 5. a support frame; 501. a lower support end; 502. supporting the middle part; 503. an upper support end; 6. a housing; 7. a rotor shaft; 8. a pole rotor assembly; 801. a columnar rotor; 802. a first permanent magnet shoe; 803. a squirrel cage structure; 9. a columnar stator assembly; 10. a disc rotor assembly; 1001. a disc rotor; 1002. a second permanent magnet shoe; 11. a disc stator assembly; 12. a gland; 13. a motor cover; 14. a bearing; 15. a reamer; 16. locking the nut; 17. a second annular end portion; 18. a first annular end portion; 19. cage bars; 20. pressing a ring; 21. a radial connecting rod.

Detailed Description

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

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

The first embodiment is as follows:

as shown in fig. 1, a cutting pump driven by a squirrel-cage embedded disc type composite self-starting permanent magnet synchronous motor comprises a base 1, wherein a pump body 2 is arranged on the base 1, an impeller 3 is arranged in the pump body 2, a pump cover 4 is arranged above the pump body 2, a support frame 5 is connected above the pump cover 4, a casing 6 is arranged above the support frame 5, a rotor shaft 7 is arranged in the casing 6, a column type rotor assembly 8 and a group of disc type rotor assemblies 10 are respectively sleeved on the rotor shaft 7, and a column type stator assembly 9 arranged in the casing 6 and corresponding to the column type rotor assembly 8 and a disc type stator assembly 11 arranged corresponding to the disc type rotor assembly 10 are arranged; the column-type rotor assembly 8 comprises a column-type rotor 801 sleeved on the rotor shaft 7, first permanent magnet magnetic shoes 802 are axially embedded in the periphery of the column-type rotor 801, a squirrel cage structure 803 is installed on the periphery of the column-type rotor 801, and a gap is kept between the periphery of the squirrel cage structure 803 and the inner periphery of the column-type stator assembly 9; the disc rotor assembly 10 comprises a disc rotor 1001 sleeved on the rotor shaft 7, a second permanent magnet magnetic shoe 1002 is embedded on the end surface of the disc rotor 1001, and the second permanent magnet magnetic shoe 1002 corresponds to the end surface of the disc stator assembly 11 and keeps a gap; the lower end of the rotor shaft 7 sequentially penetrates through the support frame 5 and the pump cover 4 and extends into the pump body 2 to be connected with the impeller 3, and the tail end of the rotor shaft 7 extends into the base 1 and is connected with a reamer 15.

The cutting pump is excellent in driving performance and strong in power output, can be used in various working conditions requiring self-starting, compact in structure and high in synchronization performance requirement, reduces the arrangement of a reduction gear, a complex transmission system and a lubricating system, has no intermediate conversion link, and is characterized in that a plurality of rotors directly act on a rotor shaft to drive an impeller to rotate together, the rotary thrust is large, the output torque is large, the motor efficiency is high, and the rotating speed is easy to control. When the permanent magnet synchronous motor is powered on, the first permanent magnet magnetic shoe 802 and the second permanent magnet magnetic shoe 1002 respectively provide a radially rotating magnetic field for the corresponding stator assembly, so that the stator assembly respectively provides axial rotation torque for the corresponding column rotor 801 and the corresponding disc rotor 1001, and the rotor shaft 7, the impeller 3 and the reamer 15 are directly driven to work under the common acting force, so that the cutting pump with high power requirement can be met.

Rotor shaft 7 is multistage ladder rotation axis, and whole cutting pump only need one rotor shaft can, the centre need not to set up shaft coupling equiaxial and the part of hub connection, and the drive power that a plurality of motors produced can directly be transmitted impeller 3 and reamer 15 on, and the loss of ability is less, makes impeller 3 with reamer 15 has great power and synchronous revolution's ability.

The cylindrical rotor assembly with the embedded squirrel cage has the advantages of simple structure, firmness, durability, reliable operation, convenience in maintenance and the like, and the first permanent magnet magnetic shoe 802 is directly embedded into the cylindrical rotor 801, so that the circumferential space occupied by the permanent magnet magnetic shoe can be reduced, and the radial size of the motor is reduced.

Further, as shown in fig. 2 to 4, the squirrel cage structure 803 includes a first annular end 18 and a second annular end 17, and a plurality of cage ribs 19 disposed between the first annular end 18 and the second annular end 17, and the cage ribs 19 are all embedded on the outer peripheral wall of the column rotor 801; the lower end of the squirrel cage structure is further connected with a pressing ring 20, the pressing ring 20 is connected with the inner circumferential surface of the first annular end portion 18 through a plurality of radial connecting rods 21, and the pressing ring 20 abuts against the end face of the first permanent magnet magnetic shoe 802.

Further, the cage rib 19 is fixedly arranged on the first annular end portion 18, the first annular end portion 18 is abutted to the lower end of the column rotor 801, and the second annular end portion 17 is detachably screwed to the upper end of the column rotor 801. The radial connecting rod 21 is disposed between a pair of the first permanent magnet tiles 802.

The pressure ring 20 can support and fix the first permanent magnet magnetic shoe 802, so that the axial movement of the first permanent magnet magnetic shoe 802 can be reduced, and the mounting stability of the first permanent magnet magnetic shoe 802 can be improved; the detachable second annular end portion 17 facilitates installation and detachment of the squirrel cage structure 803, the cross section of the cage rib 19 is a trapezoid structure with a rounded corner, and the cage rib can be well clamped in the column-type rotor 801, so that circumferential shaking of the cage rib 19 can be reduced, and the squirrel cage structure 803 is prevented from moving relative to the column-type rotor 801.

Further, the first permanent magnet magnetic shoe 802 is strip-shaped, and the adjacent first permanent magnet magnetic shoes 802 are arranged in a V shape; the first permanent magnet magnetic shoes 802 axially penetrate through the column type rotor 801 and are arranged close to the outer circumference of the column type rotor 801. The first permanent magnet tiles 802 are arranged in a V shape, and magnetic poles are sequentially and alternately arranged, so that the formation of a magnetic field and the control of magnetic force are facilitated.

Further, as shown in fig. 5, the second permanent magnet magnetic shoe 1002 is a split type fan-shaped disc structure, and is respectively attached to the upper end surface of the disc rotor 1001. The second permanent magnet magnetic shoe 1002 is fixed by industrial high-temperature magnetic shoe bonding glue, and has better bonding strength at high temperature; the split type arrangement is convenient to install and maintain independently, and the arrangement can obtain the support of the disc rotor 1001 on the upper end face and is not easy to break away.

Further, the disc stator assembly 11 includes a disc stator core, and a stator winding wound on the disc stator core; the outer periphery of the disc type stator iron core is fixed on the inner periphery of the casing 6 in a threaded mode, and an axial through hole is formed in the middle of the disc type stator iron core and sleeved on the rotor shaft 7.

Further, the pole stator assembly 9 includes a pole stator core mounted on the inner circumference of the casing 6, and a stator winding wound on the pole stator core; the axial dimension of the spot type stator assembly 9 is greater than the axial dimension of the spot type rotor assembly 8.

The disc type stator assembly 11 and the column type stator assembly 9 are independently installed inside the machine shell, can be independently installed and replaced, and are convenient for later maintenance.

Further, the support frame 5 comprises a lower support end 501, an upper support end 503 and a middle support 502; the lower support end 501 is fastened with the pump cover 4 and is fixed in a threaded manner, the upper support end 503 is fastened with the casing 6 and is fixed in a threaded manner, the middle support 502 is provided with an inner support hole structure, and the rotor shaft 7 penetrates through the inner support hole structure and is provided with a plurality of bearings 14 between the inner support hole structure and the inner support hole structure; a cavity is formed between the lower part of the support frame 5 and the pump cover 4, and multiple mechanical seals are arranged between the rotor shaft 7 and the pump cover 4.

The support frame 5 with the structure can play a better role in supporting up and down, and the lower support end 501, the upper support end 503 and the middle support 502 are respectively connected with and support one component, so that the structure is reasonable and the stability is good; the W-shaped cavity is useful in each place, and an oil chamber is not required to be arranged independently.

Further, a gland 12 is further arranged above the casing 6, a motor cover 13 is further arranged above the gland 12, the gland 12 is clamped and supported between the casing 6 and the motor cover 13, and the casing 6 is fixed around the motor cover 13 in a threaded manner; an inner counter bore is arranged below the gland 12, the upper end part of the rotor shaft 7 is sleeved in the inner counter bore, and a bearing 14 is arranged between the upper end part of the rotor shaft and the inner counter bore; the gland 12 and the motor cover 13 are both provided with wiring holes.

The arrangement of the gland 12 is convenient for connecting the rotor shaft 7 and the junction box, the gland 12 is not fixed by independent screw connection in a clamping mode, and the motor cover 13 can be fixed to fix the gland 12, so that the convenience is improved.

Further, the pump body 2 is clamped and fixed on the base 1 in a threaded manner, an axial through hole is formed in the middle of the base 1, the rotor shaft 7 penetrates through the axial through hole, the reamer 15 is connected to the axial through hole, the reamer 15 is sleeved on the rotor shaft 7, and a locking nut 16 is arranged at the lower end of the reamer.

Example two:

this embodiment provides another configuration of the motor arrangement.

As shown in fig. 6, the disc rotor assemblies 10 are a pair arranged at two axial ends of the column rotor assembly 8, and each group of disc rotor assemblies 10 is provided with a disc stator assembly 11; through the arrangement, three groups of motors are equivalently arranged in the motor shell 6, so that higher rotary thrust can be provided, and the output and the cutting and crushing capacity of the cutting pump are better.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The cutting pump driven by the squirrel-cage embedded disc type composite self-starting permanent magnet synchronous motor comprises a base, wherein a pump body is arranged on the base, an impeller is arranged in the pump body, and a pump cover is arranged above the pump body; the column type rotor assembly comprises a column type rotor sleeved on the rotor shaft, first permanent magnet magnetic shoes are axially embedded in the periphery of the column type rotor, and a squirrel cage structure is arranged on the periphery of the column type rotor; the disc rotor assembly comprises a disc rotor sleeved on the rotor shaft, a second permanent magnet magnetic shoe is embedded on the end face of the disc rotor, and the second permanent magnet magnetic shoe and the end face of the disc stator assembly are correspondingly arranged and keep a gap; one end of the rotor shaft, which is far away from the column type rotor assembly, sequentially penetrates through the support frame and the pump cover and extends into the pump body to be connected with the impeller, and the tail end of the rotor shaft extends into the base and is connected with a reamer.

2. The squirrel-cage embedded disc type composite self-starting permanent magnet synchronous motor driven cutting pump as claimed in claim 1, wherein the squirrel-cage structure comprises a first annular end part and a second annular end part, and a plurality of cage ribs arranged between the first annular end part and the second annular end part, and the cage ribs are all embedded on the outer peripheral wall of the column type rotor; at least one end of the squirrel cage structure is further connected with a pressing ring, the pressing ring is connected with the inner circumferential surface of the first annular end part and/or the second annular end part through a plurality of radial connecting rods, and the pressing ring is abutted to the end surface of the first permanent magnet magnetic shoe.

3. The cutting pump driven by the squirrel-cage embedded disc type composite self-starting permanent magnet synchronous motor according to claim 2, wherein the cage rib is fixedly arranged on the first annular end part, the first annular end part is abutted against the lower end of the column type rotor, the second annular end part is detachably screwed on the upper end of the column type rotor, and the pressing ring is connected with the first annular end part.

4. The cutting pump driven by the squirrel-cage embedded disc type composite self-starting permanent magnet synchronous motor according to claim 1, wherein the first permanent magnet magnetic shoes are strip-shaped, and the adjacent first permanent magnet magnetic shoes are arranged in a V shape; the first permanent magnet magnetic shoes axially penetrate through the column type rotor and are close to the outer circumference of the column type rotor.

5. The cutting pump driven by the squirrel-cage embedded disc type composite self-starting permanent magnet synchronous motor according to claim 1, wherein the second permanent magnet magnetic shoe is of a split type fan-shaped disc structure and is respectively attached to the upper end surface of the disc type rotor.

6. The squirrel-cage embedded disc type composite self-starting permanent magnet synchronous motor driven cutting pump according to claim 1, characterized in that the disc type stator assembly comprises a disc type stator core and a stator winding wound on the disc type stator core; the outer periphery of the disc type stator iron core is fixed on the inner periphery of the shell in a threaded mode, and an axial through hole is formed in the middle of the disc type stator iron core and sleeved on the rotor shaft.

7. The squirrel-cage embedded disc type composite self-starting permanent magnet synchronous motor driven cutting pump according to claim 1, characterized in that the column stator assembly comprises a column stator core mounted on the inner circumference of the housing, and a stator winding wound on the column stator core; the axial dimension of the column type stator component is not less than that of the column type rotor component.

8. The squirrel cage embedded disc type composite self-starting permanent magnet synchronous motor driven cutting pump as claimed in claim 1, wherein the support frame comprises a lower support end, an upper support end and a middle support; the lower support end is clamped with the pump cover and is in threaded connection and fixed, the upper support end is clamped with the shell and is in threaded connection and fixed, the middle support is provided with an inner support hole structure, and the rotor shaft penetrates through the inner support hole structure and is provided with a plurality of bearings between the rotor shaft and the inner support hole structure; a cavity is formed between the lower portion of the supporting frame and the pump cover, and a mechanical seal is arranged between the rotor shaft and the pump cover.

9. The squirrel-cage embedded disc type composite self-starting permanent magnet synchronous motor driven cutting pump as claimed in claim 1, wherein a gland is further arranged above the casing, a motor cover is further arranged above the gland, the gland is clamped and supported between the casing and the motor cover, and the motor cover is screwed and fixed on the casing; an inner counter bore is arranged below the gland, the upper end part of the rotor shaft is sleeved in the inner counter bore, and a bearing is arranged between the upper end part of the rotor shaft and the inner counter bore; the gland with all be equipped with on the motor cover and walk the line hole.

10. The cutting pump driven by the squirrel-cage embedded disc type composite self-starting permanent magnet synchronous motor according to claim 1, wherein the pump body is clamped and fixed on the base in a threaded manner, an axial through hole is formed in the middle of the base, the rotor shaft penetrates through the axial through hole and is connected with the reamer at the axial through hole, and the reamer is sleeved on the rotor shaft and is provided with a locking nut on the outer side.