CN113809894B

CN113809894B - Double-stator permanent magnet synchronous motor assembly process

Info

Publication number: CN113809894B
Application number: CN202111116768.1A
Authority: CN
Inventors: 李莹; 田磊; 李�根; 陈英姿; 李东; 乔兵朝; 史力超; 李建军
Original assignee: Hebei Newstar Electric Motor Co ltd
Current assignee: Hebei Newstar Electric Motor Co ltd
Priority date: 2021-09-23
Filing date: 2021-09-23
Publication date: 2022-07-12
Anticipated expiration: 2041-09-23
Also published as: CN113809894A

Abstract

The invention provides an assembly process of a double-stator permanent magnet synchronous motor, belonging to the technical field of motor equipment. The assembling process of the double-stator permanent magnet synchronous motor is used for assembling the rotor body to the inner part of the machine base, and the outer permanent magnet is not installed on the rotor body, so that no magnetic force effect exists between the rotor body and the machine base, the assembling difficulty is reduced, and the assembling efficiency is improved. Because the volume of the outer permanent magnet relative to the whole rotor is smaller, the position of the outer permanent magnet in the assembling process is easier to control, so that the collision between the outer permanent magnet and the machine base is effectively avoided, and the damage of the outer permanent magnet is avoided.

Description

Double-stator permanent magnet synchronous motor assembly process

Technical Field

The invention belongs to the technical field of motor equipment, and particularly relates to an assembly process of a double-stator permanent magnet synchronous motor.

Background

The double-stator permanent magnet synchronous motor comprises a base, wherein an inner stator, an outer stator and a rotor are arranged in the base, the outer stator is wrapped outside the inner stator, the rotor is arranged between the inner stator and the outer stator, and energy exchange gaps are reserved among the rotor, the inner stator and the outer stator; the rotor comprises a rotor body, an outer permanent magnet and an inner permanent magnet, wherein the outer permanent magnet and the inner permanent magnet are respectively positioned on the inner side and the outer side of the rotor body; compared with the traditional single-stator motor, the double-stator permanent magnet synchronous motor can more fully utilize the internal space of the motor under the condition of certain external diameter, and realizes higher power density and higher efficiency. In the assembly process of the existing double-stator permanent magnet synchronous motor, an inner layer permanent magnet and an outer layer permanent magnet are usually installed on a rotor body firstly, so that a rotor is formed; then assemble the inside to the frame with the rotor to support the rotor with the help of the end cover of frame both sides, nevertheless because there is magnetic action between outer permanent magnet and the outer stator, very easily take place to collide with between outer permanent magnet and the frame, lead to outer permanent magnet to damage.

Disclosure of Invention

The invention aims to provide an assembly process of a double-stator permanent magnet synchronous motor, and aims to solve the problem that an outer layer permanent magnet is damaged because the outer layer permanent magnet is easy to collide with a base in the assembly process of the conventional double-stator permanent magnet synchronous motor.

In order to achieve the purpose, the invention adopts the technical scheme that: the assembly process of the double-stator permanent magnet synchronous motor comprises the following steps:

the method comprises the following steps: an outer stator is fixedly arranged on the inner circumference of the base; sleeving and fixing the inner stator on the fixed shaft, and sleeving and fixing the rotor body on the rotating shaft;

step two: assembling the rotor body and the inner stator inside the base, wherein the fixed shaft is rotatably connected with the rotating shaft, the inner stator and the outer stator are respectively positioned at the inner side and the outer side of the rotor body, and meanwhile, an operation space is reserved between the inner stator and the rotor body, and between the outer stator and the rotor body; then, respectively sleeving end covers on the fixed shaft and the rotating shaft, and fixedly connecting the end covers with the base;

step three: and fixedly mounting the outer layer permanent magnet on the outer circumference of the rotor body through a first operation hole formed in the end cover.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic cross-sectional structural diagram of a double-stator permanent magnet synchronous motor according to a first embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is an exploded view of the end cap according to the second embodiment of the present invention;

fig. 4 is an exploded schematic view of an end cap according to a third embodiment of the present invention;

fig. 5 is an exploded view of the end cap according to the fourth embodiment of the present invention;

FIG. 6 is a partial cross-sectional view of an end cap according to a fourth embodiment of the present invention;

FIG. 7 is a partial cross-sectional view of an end cap body provided in accordance with a fifth embodiment of the present invention;

fig. 8 is a schematic cross-sectional structural view of a double-stator permanent magnet synchronous motor according to a sixth embodiment of the present invention;

fig. 9 is a schematic cross-sectional structural view of a double-stator permanent magnet synchronous motor according to a seventh embodiment of the present invention;

fig. 10 is a sectional view of an assembled structure of an end cap according to an eighth embodiment of the present invention;

FIG. 11 is a sectional view of an assembled structure of an end cap according to a ninth embodiment of the present invention;

fig. 12 is a schematic cross-sectional structural diagram of a double-stator permanent magnet synchronous motor according to a tenth embodiment of the present invention;

FIG. 13 is an enlarged view of a portion of FIG. 12 at E;

fig. 14 is a schematic cross-sectional structural view of a double-stator permanent magnet synchronous motor according to an eleventh embodiment of the present invention;

fig. 15 is a schematic view of an installation structure of permanent magnets in a double-stator permanent magnet synchronous motor according to a twelfth embodiment of the present invention;

fig. 16 is a schematic cross-sectional structural diagram of a double-stator permanent magnet motor according to a thirteenth embodiment of the present invention.

In the figure: 1. a machine base; 101. a sleeve; 102. a support flange; 103. an annular cavity; 2. fixing a shaft; 201. a first cooling chamber; 202. a water delivery pipeline; 203. reinforcing ribs; 204. a first sealing cover; 3. a rotating shaft; 301. a second cooling chamber; 302. a first bearing; 303. an inner bearing cover; 304. a second bearing; 305. a first mounting flange; 306. a third bearing; 4. an outer stator; 401. an outer stator core; 402. an outer stator coil; 5. an inner stator; 501. a third cooling chamber; 502. a through hole; 503. an inner stator core; 504. an inner stator coil; 6. a rotor; 601. a rotor body; 602. an inner permanent magnet; 603. an outer permanent magnet; 604. a pole shoe; 605. a clamping groove; 606. fastening screws; 607. a counter bore; 610. a rotor yoke; 611. a magnetism isolating ring; 613. a second operation hole; 7. an end cap; 701. an end cap body; 702. a cover plate; 703. a first operation hole; 704. an outer ring; 705. an inner ring; 706. supporting ribs; 707. installing a groove; 708. positioning a block; 709. positioning the notch; 710. a gasket; 711. a connecting member; 712. a guide slider; 713. a guide chute; 714. a second sealing cover; 715. a bearing housing; 716. a second mounting flange; 717. a seal ring; 718. an oil inlet pipe; 719. an oil outlet pipe; 720. a stopper; 721. a bearing end cap; 722. carrying out top thread; 723. and a ball.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, 12 and 13, an assembly process of a double-stator permanent magnet synchronous motor according to the present invention will now be described. The assembling process of the double-stator permanent magnet synchronous motor comprises the following steps:

the method comprises the following steps: an outer stator 4 is fixedly arranged on the inner circumference of the engine base 1; sleeving and fixing the inner stator 5 on the fixed shaft 2, and sleeving and fixing the rotor body 601 on the rotating shaft 3;

step two: assembling a rotor body 601 and an inner stator 5 into the inside of a machine base 1, wherein a fixed shaft 2 is rotatably connected with a rotating shaft 3, the inner stator 5 and an outer stator 4 are respectively positioned at the inner side and the outer side of the rotor body 601, and meanwhile, operation spaces are reserved between the inner stator 5 and the rotor body 601 and between the outer stator 4 and the rotor body 601; then, the end covers 7 are respectively sleeved on the fixed shaft 2 and the rotating shaft 3, and the end covers 7 are fixedly connected with the machine base 1;

step three: the outer permanent magnet 603 is fixedly mounted on the outer circumference of the rotor body 601 through a first operation hole 703 formed in the end cover 7.

Compared with the prior art, the assembling process of the double-stator permanent magnet synchronous motor provided by the embodiment firstly assembles the rotor body 601 and the inner stator 5 into the base 1, and then fixedly installs the outer layer permanent magnet 603 to the outer circumference of the rotor body 601. In the process of assembling the rotor body 601 into the machine base 1, the outer layer permanent magnet 603 is not installed on the rotor body 601, so that no magnetic force action exists between the rotor body 601 and the machine base 1, the assembly difficulty is reduced, and the assembly efficiency is improved. Because the volume of outer permanent magnet 603 relative whole rotor 6 is littleer, the position of outer permanent magnet 603 in the assembling process is controlled more easily to effectively avoid taking place to collide with between outer permanent magnet 603 and the frame 1, avoid outer permanent magnet 603 to take place to damage.

In some embodiments, referring to fig. 1 and 3, after the step of fixedly mounting the outer permanent magnet 603 on the outer circumference of the rotor body 601, the cover plate 702 is assembled to the end cover 7 at the first operation hole 703. In this embodiment, the end cap 7 includes: an end cap body 701 and a cover plate 702. The end cover body 701 is fixedly arranged on the base 1; a first operation hole 703 is formed in the end face of the end cover body 701, and the first operation hole 703 penetrates through the end cover body 701; the center of the end cover body 701 is provided with a center hole for installing the dead axle 2, and the cover plate 702 is detachably installed on the outer side of the end cover body 701 for sealing the first operation hole 703. The end cover body 701 is provided with the first operation hole 703, so that the end cover body 701 forms a frame structure, and the whole weight is reduced while the requirement on structural strength is met. When parts in the base 1 need to be maintained and replaced, only the cover plate 702 needs to be detached from the end cover body 701, and then a maintenance worker can stretch hands into the base 1 from the first operation hole 703 to complete replacement of the parts. In the process of maintaining the parts in the machine base 1, the whole end cover 7 is not required to be disassembled, so that the labor intensity of maintenance personnel is reduced, and the maintenance period is greatly shortened.

In some embodiments, referring to fig. 3, the end cap body 701 includes: an outer ring 704, an inner ring 705, and a plurality of support ribs 706; the inner ring 705 is located inside the outer ring 704 and is arranged coaxially with the outer ring 704; the two ends of the support rib 706 are respectively connected with the outer ring 704 and the inner ring 705, the plurality of support ribs 706 are arranged in a radial mode, and the support rib 706, the outer ring 704 and the inner ring 705 enclose a first operation hole 703. In this embodiment, the outer ring 704 and the inner ring 705 are concentric rings, and the outer ring 704 and the inner ring 705 are fixedly connected by the support ribs 706. The outer ring 704 is fixedly connected with the base 1, the inner ring 705 is sleeved on the rotating shaft 3, and the rotating shaft 3 is a supporting shaft for driving the rotor 6 to rotate. The support ribs 706 divide the annular region between the outer ring 704 and the inner ring 705 into a plurality of scallops, which are the first handling holes 703 described above. The plurality of support ribs 706 are uniformly arranged along the circumferential direction of the outer ring 704 or the inner ring 705, so that the shape and the size of each first operation hole 703 are kept consistent, and sufficient operation space can be ensured when maintenance operation is performed on parts in any area.

In some embodiments, referring to fig. 3, the cover plate 702 is a fan-shaped member, and the number of the cover plate 702 and the number of the first operation holes 703 are the same. In this embodiment, since the first operation hole 703 is a fan-shaped hole, the shape of the cover plate 702 matches the outer contour of the first operation hole 703. The cover plate 702 is fixedly connected with the body of the cover plate 702 through screws. Each first operation hole 703 is correspondingly provided with a cover plate 702. When the parts inside the base 1 need to be disassembled, the corresponding cover plate 702 is only needed to be opened.

In some embodiments, referring to fig. 4, the cover plate 702 is an annular member disposed coaxially with the outer ring 704. In this embodiment, the cover plate 702 is fixedly connected to the outer ring 704 and/or the inner ring 705 by screws, so as to seal the first operation hole 703. Because the cover plate 702 adopts a ring-shaped member, all the first operation holes 703 can be sealed at the same time, and the disassembly and assembly efficiency is greatly reduced.

In some embodiments, referring to fig. 3 to 5, the outer end surface of the outer ring 704 is provided with a mounting groove 707 for mounting the cover plate 702. In this embodiment, the depth of the mounting groove 707 is greater than or equal to the thickness of the cover plate 702, which greatly saves the space occupied by the cover plate 702, and prevents the cover plate 702 from protruding out of the outer end surface of the outer ring 704, so that the overall structure is more compact. The thickness dimension of the outer ring 704 in the axial direction thereof is equal to or greater than the thickness dimension of the inner ring 705, thereby ensuring that the outboard end face of the inner ring 705 does not protrude beyond the outboard end face of the outer ring 704. When the outboard end of the inner ring 705 is flush with the outboard end of the outer ring 704, a groove is also provided on the outboard end of the inner ring 705 that mates with the cover plate 702.

In some embodiments, referring to fig. 5, at least two positioning blocks 708 are disposed in the mounting groove 707, the positioning blocks 708 are disposed along the circumference of the outer ring 704, and the edge of the cover plate 702 is provided with a positioning notch 709 that is fitted with the positioning blocks 708. In this embodiment, the positioning block 708 is fixed in the mounting groove 707 by welding. The positioning blocks 708 are uniformly arranged along the circumference of the outer ring 704, and play a role in positioning and supporting the cover plate 702. In the process of assembling the cover plate 702, the positioning notch 709 on the cover plate 702 is aligned to the positioning block 708, so that the cover plate 702 can be clamped on the positioning block 708, and then the cover plate 702 is locked and fixed by the mounting screw.

In some embodiments, referring to fig. 6, a gasket 710 is disposed between the cover plate 702 and the outer ring 704. In this embodiment, the sealing pad 710 is made of rubber, and is used to improve the sealing property between the cover 702 and the outer ring 704. The sealing pad 710 is an annular member provided to correspond to the outer ring 704. The inboard end face of the cover plate 702 is provided with an annular groove for mounting a gasket 710. Glue is smeared on the surface of the annular groove and used for fixing the sealing gasket 710 in the annular groove, so that displacement change between the sealing gasket 710 and the cover plate 702 is effectively prevented, and the assembly efficiency is improved. Similarly, a gasket 710 may be disposed between the cover plate 702 and the inner ring 705 to improve the sealing between the cover plate 702 and the inner ring 705.

In some embodiments, referring to fig. 7, the support ribs 706 are connected to the outer ring 704 and the inner ring 705 by connectors 711. In this embodiment, the connecting member 711 is a screw. Flanges for mounting screws are arranged at two ends of the support rib 706 in the length direction and are positioned at two sides of the support rib 706. The flange is provided with through holes 502 for mounting screws. The support ribs 706, the outer ring 704 and the inner ring 705 are of a split structure, so when part of the end cover body 701 is damaged, only one or two parts of the end cover body 701 need to be repaired and replaced, and the repair cost of the end cover body 701 is greatly reduced; meanwhile, the size of the first operation hole 703 can be increased by detaching the supporting rib 706, so that the maintenance personnel can smoothly take out the parts at each position in the machine base 1.

In some embodiments, referring to fig. 7, the support rib 706 has guide sliding blocks 712 at two ends in the length direction, and the inner wall of the outer ring 704 and the outer wall of the inner ring 705 are correspondingly provided with guide sliding slots 713 fitted with the guide sliding blocks 712. In this embodiment, the guide sliding block 712 and the supporting member are integrally formed by casting, so that the integrally formed structure has better strength and is more durable. The guide chute 713 is provided along the axial direction of the outer ring 704 or the inner ring 705. The guide sliding blocks 712 on the support ribs 706 are aligned with the guide sliding grooves 713, then the support ribs 706 are pushed into the guide sliding grooves 713, and finally the support ribs 706 are fixedly connected with the outer ring 704 and the inner ring 705 through fasteners. By arranging the guide sliding blocks 712 on the support ribs 706, the mounting efficiency of the support ribs 706 is improved, and meanwhile, the contact area between the support ribs 706 and the outer ring 704 and the inner ring 705 is increased, so that the support ribs 706, the outer ring 704 and the inner ring 705 are firmer, and the whole end cover body 701 can bear larger torsion.

In some embodiments, referring to fig. 8, the end cap 7 includes: an end cap body 701 and a second seal cap 714. The end cover body 701 is used for connecting the engine base 1 and the fixed shaft 2; the second sealing cover 714 is fixedly installed on the inner side of the end cover body 701, the fixed shaft 2 is fixedly connected with the machine base 1 through the end cover body 701, the fixed shaft 2 is connected with the rotor 6 through the bearing sleeve 715, the second sealing cover 714 is rotatably connected with the bearing sleeve 715, and the second sealing cover 714, the bearing sleeve 715 and the fixed shaft 2 enclose to form a closed space. In this embodiment, the end cap body 701 supports the fixed shaft 2 by connecting the base 1 and the fixed shaft 2. A second seal cap 714 is fixedly mounted inside the end cap body 701. When the end cover body 701 is installed in place, the second sealing cover 714 is rotatably connected with the bearing sleeve 715, and meanwhile, the second sealing cover 714, the bearing sleeve 715 and the fixed shaft 2 are enclosed to form a closed space, so that the bearing is sealed; because the second sealing cover 714 is rotatably connected with the bearing sleeve 715, the original bearing outer cover is omitted, the number of parts is reduced, the labor intensity of operators is reduced, and meanwhile, the oil injection and discharge device can be directly installed on the end cover 7.

In some embodiments, referring to fig. 8, the second sealing cover 714 is integrally formed with the end cap body 701. In this embodiment, integrated into one piece's structural strength is higher, and is more durable, is favorable to promoting this two stator PMSM's end cover 7's life. Because the second sealing cover 714 is rotatably connected with the bearing sleeve 715, the matching surface between the second sealing cover 714 and the bearing sleeve 715 is easily worn, and in order to prolong the service life of the second sealing cover 714, the local part of the second sealing cover 714 can be subjected to heat treatment, so that the wear resistance of the second sealing cover 714 is improved.

In some embodiments, referring to fig. 9, the second sealing cover 714 and the end cap body 701 are separated. In this embodiment, the second sealing cover 714 and the end cover body 701 adopt a split structure, so that the second sealing cover 714 or the end cover body 701 can be maintained and replaced independently, thereby greatly reducing the maintenance cost and greatly reducing the manufacturing difficulty. The second sealing cover 714 is connected with the end cover 7 by bolts or screws.

In some embodiments, referring to fig. 9, the end of the second seal cap 714 is provided with a second mounting flange 716 fixedly connected to the end cap body 701. In this embodiment, the second mounting flange 716 and the second sealing cover 714 are fixed by welding. The second mounting flange 716 is provided with a through hole for mounting a bolt or a threaded hole for mounting a screw. The second mounting flange 716 increases the contact area between the second sealing cover 714 and the end cover body 701, so that the connection between the second sealing cover 714 and the end cover body 701 is firmer and more stable.

In some embodiments, referring to fig. 11, a sealing ring 717 is installed on the mating surface of the second sealing cover 714 and the bearing housing 715. In this embodiment, the outer circumferential surface of the second seal cover 714 is provided with an annular groove for mounting the seal ring 717. The sealing ring 717 is a rubber ring, and the rubber material has the characteristics of corrosion resistance, oxidation resistance and the like. In order to improve sealability between the second seal cover 714 and the bearing housing 715, a plurality of seal rings 717 may be uniformly arranged in the axial direction of the second seal cover 714. Similarly, a seal 717 may be provided between the second seal cover 714 and the fixed shaft 2 in order to ensure the sealing property between the second seal cover 714 and the fixed shaft 2.

In some embodiments, referring to fig. 10, the second seal cap 714 is provided with an oil inlet pipe 718 and an oil outlet pipe 719. In this embodiment, the oil inlet pipe 718 and the oil outlet pipe 719 are respectively located at upper and lower ends of the second seal cover 714, and are communicated with the inside of the second seal cover 714. The oil inlet pipe 718 and the oil outlet pipe 719 extend to the outside of the end cap body 701, and control valves may be installed on the oil inlet pipe 718 and the oil outlet pipe 719 to control opening and closing of the oil inlet pipe 718 and the oil outlet pipe 719. In order to ensure that the bearing in the bearing sleeve 715 can work normally, lubricating liquid needs to be coated on the bearing, but the lubricating liquid needs to be replaced after working for a period of time, so that the lubricating effect of the lubricating liquid on the bearing is ensured. The new lubricating liquid is injected into the closed space formed by the second sealing cover 714, the bearing sleeve 715 and the fixed shaft 2 through the oil inlet pipe 718, and the old lubricating liquid in the closed space is discharged from the oil outlet pipe 719, so that the lubricating liquid is replaced, the motor does not need to be disassembled in the process, the operation is convenient, the labor intensity is greatly reduced, and the working efficiency is improved.

In some embodiments, referring to fig. 9 and 11, the second sealing cover 714 is provided with a limiting member 720 at an outer circumference thereof, and the limiting member 720 abuts against an outer end surface of the bearing sleeve 715 for limiting the freedom of the bearing sleeve 715 moving along the axial direction thereof. In this embodiment, the position-limiting member 720 is annular, and the position-limiting member 720 is sleeved on the second sealing cover 714. The other side of the bearing sleeve 715 far away from the second sealing cover 714 is provided with a bearing end cover 721, and the fixed shaft 2 is correspondingly provided with a shaft shoulder which is matched with the bearing end cover 721. The limiting member 720 is matched with the fixed shaft 2 to clamp and fix the bearing sleeve 715. The second sealing cover 714 is in threaded connection with the limiting member 720, and the position of the limiting member 720 on the second sealing cover 714 can be changed by rotating the limiting member 720, so as to adjust the acting force applied by the limiting member 720 to the bearing housing 715. In order to prevent the retaining member 720 from loosening, a screw 722 may be mounted on the retaining member 720, and the screw 722 abuts against the outer circumferential surface of the second sealing cover 714, so as to lock and fix the retaining member 720.

In some embodiments, referring to fig. 11, a ball 723 is installed on a side surface of the position-limiting member 720 opposite to the bearing housing 715, and the position-limiting member 720 abuts against an outer end surface of the bearing housing 715 by means of the ball 723. In this embodiment, the side surface of the stopper 720 is provided with a ball 723 groove for mounting the ball 723, and the ball 723 protrudes from the ball 723 groove and abuts against the outer end surface of the bearing housing 715. The number of the balls 723 is plural and is uniformly arranged in the circumferential direction of the retainer 720. By installing the ball 723 on the limiting member 720, the contact area between the limiting member 720 and the bearing bush 715 is reduced, the frictional resistance and the abrasion to the bearing bush 715 are reduced, and the service life of the bearing bush 715 is prolonged.

In some embodiments, referring to fig. 1, a second operation hole 613 is formed in a side surface of the rotor body 601, and the second operation hole 613 is disposed corresponding to the first operation hole 703; after the step of assembling the rotor body 601 and the inner stator 5 to the inside of the housing 1, the inner permanent magnet 602 is fixedly installed on the inner circumference of the rotor body 601. In this embodiment, after the rotor body 601 and the inner stator 5 are assembled with the housing 1 in place, the inner permanent magnet 602 is assembled to the inner circumference of the rotor body 601 sequentially through the first operation hole 703 and the second operation hole 613. In the process of assembling the rotor body 601 and the inner stator 5, the inner permanent magnet 602 is not installed on the rotor body 601, so that no magnetic force exists between the rotor body 601 and the inner stator 5, the assembly difficulty is reduced, and the assembly efficiency is improved. Because the volume of the inner permanent magnet 602 relative to the whole rotor 6 is smaller, the position of the inner permanent magnet 602 in the assembling process is easier to control, so that the collision between the inner permanent magnet 602 and the inner stator 5 is effectively avoided, and the inner permanent magnet 602 is prevented from being damaged.

In some embodiments, referring to fig. 1, 12 and 13, before the step of assembling the rotor body 601 and the inner stator 5 into the housing 1, a pole piece 604 for fixing the outer permanent magnet 603 is installed at the outer circumference of the rotor body 601. In this embodiment, the pole shoe 604 is installed on the outer circumference of the rotor body 601, then the rotor body 601 is assembled in the machine base 1, and the outer permanent magnet 603 is fixed by using the pole shoe 604.

In some embodiments, referring to fig. 1, 12 and 13, the side surface of the pole shoe 604 is provided with a clamping groove 605 extending along the axial direction of the rotor body 601, and the outer layer permanent magnet 603 is inserted into the clamping groove 605 along the axial direction of the rotor body 601. In this embodiment, the outer permanent magnets 603 are arranged in the radial direction of the rotor body 601. The outer permanent magnet 603 and the inner permanent magnet 602 are both strip-shaped, and the length directions of the outer permanent magnet 603 and the inner permanent magnet 602 are both consistent with the axial direction of the rotor body 601. The cross section of the outer permanent magnet 603 is rectangular, and the cross section of the inner permanent magnet 602 is tile-shaped. The inner layer permanent magnet 602 is a surface-mount permanent magnet, the surface-mount permanent magnet is generally fixedly connected with the rotor body 601 by glue or screws, and the inner layer permanent magnet 602 is arranged along the tangential direction of the rotor body 601. Since the pole shoe 604 is installed on the outer side of the rotor body 601, which results in a smaller installation space for the outer permanent magnet 603 than for the inner permanent magnet 602, in order to ensure that there is a sufficient number of outer permanent magnets 603, the outer permanent magnets 603 are arranged in the radial direction of the rotor body 601 (i.e., the short side of the cross section of the outer permanent magnet 603 faces the rotor body 601). The clamping grooves 605 are located on two side surfaces of the pole shoes 604, that is, an outer permanent magnet 603 is installed between two adjacent pole shoes 604, so that the space outside the rotor body 601 can be fully utilized, more outer permanent magnets 603 can be assembled outside the rotor body 601, and higher power density is realized.

In some embodiments, referring to fig. 1 and 14, pole shoes 604 are installed on the inner and outer circumferences of the rotor body 601, and the outer layer permanent magnet 603 and the inner layer permanent magnet 602 are fixed by clamping grooves 605 on the pole shoes 604. The pole shoes 604 are fixed on the inner and outer circumferences of the rotor body 601, then the rotor body 601 is assembled in the engine base 1, the outer permanent magnet 603 is inserted into the clamping groove 605 on the outer side of the rotor body 601 through the first operation hole 703, and the inner permanent magnet 602 is inserted into the clamping groove 605 on the inner side of the rotor body 601 through the first operation hole 703 and the second operation hole 613, so that the outer permanent magnet 603 and the inner permanent magnet 602 are assembled.

In some embodiments, referring to fig. 15, the pole piece 604 is connected to the rotor body 601 by fastening screws 606. In this embodiment, the pole shoe 604 is fixedly connected to the rotor body 601 by a fastening screw 606, so as to facilitate the assembly and disassembly of the pole shoe 604. The number of the fastening screws 606 is multiple, the fastening screws are evenly arranged along the length direction of the pole shoe 604, and threaded holes matched with the fastening screws 606 are formed in the rotor body 601.

In some embodiments, referring to fig. 15, the pole piece 604 is provided with a counterbore 607 for mounting a fastening screw 606. In this embodiment, the height of the pole shoe 604 is greater than that of the outer permanent magnet 603, and the top surface of the pole shoe 604 is an arc surface protruding outward. The pole shoe 604 protrudes out of the outer permanent magnet 603 in the radial direction of the rotor body 601, so that the outer permanent magnet 603 can be protected, and the outer permanent magnet 603 is prevented from being collided in the assembling process. Through setting up counter bore 607 on pole piece 604 to avoid fastening screw 606 to bulge the top surface of pole piece 604, saved installation space on the one hand, make overall structure compacter, on the other hand can avoid in the assembling process, fastening screw 606 and other parts on the motor take place to interfere or collide with.

In some embodiments, referring to fig. 15, the pole piece 604 faces the inner permanent magnet 602, and the fastening screw 606 penetrates the rotor body 601 and is screwed with the inner permanent magnet 602. In this embodiment, a through hole 502 for passing a fastening screw 606 is formed in the rotor body 601, a threaded hole connected with the fastening screw 606 is correspondingly formed in the inner permanent magnet 602, and the threaded hole is a blind hole, that is, the threaded hole does not penetrate through the entire inner permanent magnet 602. After the inner permanent magnet 602 is assembled in place, the threaded hole in the inner permanent magnet 602 cannot be observed from the outside, and the attractiveness of the overall structure is improved. By adopting the structure, the number of the required fastening screws 606 is reduced, namely one fastening screw 606 can be used for fixing the pole shoe 604 and the inner layer permanent magnet 602 at the same time, the labor intensity of operators is greatly reduced, and the dismounting efficiency is improved.

In some embodiments, referring to fig. 13, the side surface of the pole shoe 604 is provided with a clamping groove 605 extending along the axial direction of the rotor body 601, and the outer layer permanent magnet 603 is inserted into the clamping groove 605 along the axial direction of the rotor body 601. In this embodiment, the outer permanent magnet 603 is inserted into the clamping groove 605 from one axial side of the rotor body 601, and a screw does not need to be installed between the outer permanent magnet 603 and the rotor body 601, thereby greatly improving the assembly efficiency.

In some embodiments, referring to fig. 16, the axial length of the inner stator 5 is less than the axial length of the outer stator 4. In the present embodiment, the inner stator 5 includes an inner stator core 503 and an inner stator coil 504, and the outer stator 4 includes an outer stator core 401 and an outer stator coil 402. The axial lengths of the outer stator core 401 and the inner stator core 503 are different, and the axial length of the inner stator core 503 is shorter than that of the outer stator core 401, so that the motor is convenient to install while conforming to the actual operation condition, the space inside the motor is fully utilized, and the power density of the motor is improved. The axial length of the inner layer permanent magnet 602 is the same as that of the inner stator iron core 503 and is smaller than that of the outer layer permanent magnet 603, so that the total permanent magnet consumption is saved, and the manufacturing cost is reduced.

In some embodiments, referring to fig. 15, the rotor body 601 includes a rotor yoke 610 and a magnetism isolating ring 611; the magnetism isolating ring 611 is sleeved outside the rotor yoke 610 and is relatively fixed with the rotor yoke 610; the inner layer permanent magnet 602 is fixedly arranged on the inner side of the rotor yoke 610, and the pole shoe 604 and the outer layer permanent magnet 603 are fixed on the outer side of the magnetism isolating ring 611. In this embodiment, the rotor yoke 610 and the magnetism isolating ring 611 are both ring-shaped members. The magnetism isolating ring 611 separates the magnetic fields generated by the inner layer permanent magnet 602 and the outer layer permanent magnet 603, and avoids interference between the magnetic fields inside and outside the rotor body 601. Rotor yoke 610 separates the magnetic ring 611 with separating for the components of a whole that can function independently structure, conveniently maintains the change, has reduced cost of maintenance.

In some embodiments, referring to fig. 1, the machine base 1 is provided with support flanges 102 at two axial ends; the outer side of the machine base 1 is sleeved with a sleeve 101 connected with two supporting flanges 102; a closed annular cavity 103 is formed between the sleeve 101 and the base 1 in an enclosing manner, and the annular cavity 103 is used for containing cooling liquid; the inside of dead axle 2 is equipped with first cooling chamber 201, and the inside of pivot 3 is equipped with second cooling chamber 301. In this embodiment, the axial two ends of the base 1 are provided with the supporting flanges 102, the outer side of the base 1 is sleeved with the sleeve 101, the axial two ends of the sleeve 101 are fixedly connected with the supporting flanges 102, an annular cavity 103 for containing cooling liquid is formed between the base 1 and the sleeve 101, and the outer peripheral surface of the base 1 is in contact with the cooling liquid. The fixed shaft 2 and the rotating shaft 3 are coaxially arranged and rotatably connected. A first cooling cavity 201 and a second cooling cavity 301 are respectively arranged in the fixed shaft 2 and the rotating shaft 3, and cooling liquid is introduced into the first cooling cavity 201 and the second cooling cavity 301. The utility model provides a two stator PMSM can cool off the motor simultaneously from the inside and outside both sides of motor to reach the purpose to the motor cooling, solved the not good problem of motor heat dispersion.

In this embodiment, in order to achieve the heat dissipation effect, the annular cavity 103, the first cooling cavity 201, and the second cooling cavity 301 may contain therein not only the cooling liquid, but also cooling gas or other cooling media.

In some embodiments, referring to fig. 1, the first cooling chamber 201 and the second cooling chamber 301 are in communication with each other. In this embodiment, the cooling liquid is cooling water or cooling oil. Since the first cooling cavity 201 and the second cooling cavity 301 are communicated with each other, the water conveying pipeline 202 is only required to be installed on the fixed shaft 2, and the interior of the first cooling cavity 201 and the interior of the second cooling cavity 301 can be filled with cooling water. In the working process, the fixed shaft 2 and the base 1 are relatively fixed, so that the cooling water can still be injected into the first cooling cavity 201 and the second cooling cavity 301 or discharged from the first cooling cavity 201 and the second cooling cavity 301 through the water conveying pipeline 202 under the condition that the motor does not stop.

In some embodiments, referring to fig. 1 and fig. 2, the inner wall of the first cooling chamber 201 and/or the second cooling chamber 301 is provided with a rib 203. In this embodiment, since the first cooling chamber 201 and the second cooling chamber 301 are provided inside the fixed shaft 2 and the rotating shaft 3, the ribs 203 are provided on the inner walls of the first cooling chamber 201 and the second cooling chamber 301 in order to improve the structural strength of the fixed shaft 2 and the rotating shaft 3. Taking the first cooling cavity 201 as an example, the cross section of the first cooling cavity 201 is circular, and the axis of the first cooling cavity 201 is consistent with the axis of the fixed shaft 2. The reinforcing ribs 203 are long, and the length direction of the reinforcing ribs 203 is consistent with the axial direction of the fixed shaft 2; the number of the reinforcing ribs 203 is plural and is uniformly arranged along the circumferential direction of the first cooling chamber 201. The second cooling chamber 301 and the first cooling chamber 201 may have the same or different structures.

In some embodiments, referring to fig. 1, the first cooling cavity 201 penetrates through the fixed shaft 2 along the axial direction of the fixed shaft 2, and a first sealing cover 204 is installed at an end of the fixed shaft 2 away from the rotating shaft 3, and the first sealing cover 204 is used for sealing the first cooling cavity 201. In this embodiment, one end of the fixed shaft 2 is rotatably connected to the rotating shaft 3, and the other end is provided with a first sealing cover 204. The first seal cover 204 is fixedly connected to the fixed shaft 2 by screws. When the inside of first cavity and second cavity need be cleared up, only need open first sealed lid 204 can, need not to dismantle dead axle 2 and pivot 3 from frame 1 and get off. The water pipe 202 may be installed on the first sealing cover 204, or may be installed on the outer wall of the fixed shaft 2.

In some embodiments, referring to fig. 1, the fixed shaft 2 is rotatably connected to the rotating shaft 3, and an end of the rotor body 601 away from the rotating shaft 3 is rotatably connected to the fixed shaft 2. In this embodiment, the rotor body 601 is cylindrical, one axial end of the rotor body 601 is fixedly connected with the rotating shaft 3, the other axial end of the rotor body 601 is rotatably connected with the fixed shaft 2, and the rotating shaft 3 and the fixed shaft 2 respectively provide two-point support for the rotor body 601, so that the rotor 6 is more stable in the working process. A third bearing 306 is installed between the rotor 6 and the rotating shaft 3.

In some embodiments, referring to fig. 1, a first bearing 302 is installed between the rotating shaft 3 and the fixed shaft 2, an inner bearing cover 303 for sealing the first bearing 302 is installed at an end of the rotating shaft 3, and the inner bearing cover 303 is sleeved outside the fixed shaft 2 and is in rotating fit with the fixed shaft 2. In this embodiment, one end of the rotating shaft 3 close to the fixed shaft 2 is sleeved outside the fixed shaft 2, a cavity for installing the first bearing 302 is formed between the rotating shaft 3 and the fixed shaft 2, and the cavity is communicated with the first cooling cavity 201 and the second cooling cavity 301. The bearing inner cover 303 is of an annular structure, and the bearing inner cover 303 is fixedly mounted on the end face of the rotating shaft 3 and used for sealing the first bearing 302 in the cavity. The coolant enters the interior of the first bearing 302 to lubricate and cool the first bearing 302. A second bearing 304 is installed between the rotating shaft 3 and the end cover 7.

In some embodiments, referring to fig. 1, the rotating shaft 3 is provided with a first mounting flange 305 for fixedly connecting with the rotor 6. In this embodiment, the first mounting flange 305 is coaxially disposed with the rotating shaft 3, and the rotor 6 is sleeved on the rotating shaft 3. By providing the first mounting flange 305 on the rotating shaft 3, the rotor 6 can be fixedly connected to the rotating shaft 3. The first mounting flange 305 and the rotating shaft 3 are of an integral structure, so that the integral structure is higher in strength, and is more firm and durable. The first mounting flange 305 is in contact with a side wall of the rotor 6, the first mounting flange 305 is connected with the side wall of the rotor 6 through screws, through holes for mounting the screws are correspondingly formed in the first mounting flange 305, and the number of the screws is multiple and is arranged along the circumferential direction of the first mounting flange 305.

In some embodiments, referring to fig. 1 and 2, a third cooling cavity 501 is disposed inside the inner stator 5, and a through hole 502 for communicating the first cooling cavity 201 and the third cooling cavity 501 is disposed on an outer wall of the fixed shaft 2. In this embodiment, the third cooling cavity 501 is disposed inside the inner stator 5, so that the weight of the inner stator 5 can be reduced, and the cost of raw materials can be saved. The cooling liquid in the first cooling cavity 201 enters the third cooling cavity 501 through the through hole 502 formed in the outer wall of the fixed shaft 2, the area of the region covered by the cooling liquid is further increased, meanwhile, the cooling liquid is closer to a heating element in the motor, and the cooling effect on the motor is improved. The inner stator 5 can be fixedly connected with the fixed shaft 2 in a welding mode, and can also be detachably connected with the fixed shaft 2 by fasteners such as screws and the like.

In some embodiments, referring to fig. 2, the third cooling cavity 501 is an annular cavity 103, and the number of the through holes 502 is plural and is arranged along the circumferential direction of the fixed shaft 2. In this embodiment, the stator is a cylindrical structure, and is fixed to the outside of the fixed shaft 2 in a sleeved manner. The annular cavity 103 is arranged coaxially with the stator, so that the contact area between the cooling liquid in the third cooling cavity 501 and the stator is maximized, i.e. the best cooling effect is achieved. The plurality of through holes 502 are uniformly arranged in the circumferential direction of the fixed shaft 2, thereby increasing the rate of injecting the cooling liquid into the third cooling chamber 501. In order to facilitate the replacement of the cooling liquid in the third cooling chamber 501, a drain pipe may be installed on the motor, the drain pipe passing through the first cooling chamber 201 from the outside and extending into the third cooling chamber 501, and the drain pipe discharging the cooling liquid in the third cooling chamber 501 to the outside.

The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims

1. The assembling process of the double-stator permanent magnet synchronous motor is characterized by comprising the following steps of:

2. The assembling process of a double-stator permanent magnet synchronous motor according to claim 1, wherein a cover plate is assembled at the first operating hole on the end cover after the step of fixedly installing the outer permanent magnets on the outer circumference of the rotor body.

3. The assembling process of a double-stator permanent magnet synchronous motor according to claim 1, wherein a second operation hole is formed in the side surface of the rotor body, and the second operation hole is arranged corresponding to the first operation hole; after the inner step of assembling the rotor body and the inner stator to the housing, inner permanent magnets are fixedly installed on an inner circumference of the rotor body.

4. A process of assembling a double stator permanent magnet synchronous motor according to claim 1, wherein pole pieces for fixing the outer permanent magnets are installed at an outer circumference of the rotor body before the step of assembling the rotor body and the inner stator to the inside of the housing.

5. An assembling process of a double-stator permanent magnet synchronous motor according to claim 4, wherein clamping grooves extending along the axial direction of the rotor body are formed in the side faces of the pole shoes, and the outer layer permanent magnets are inserted into the clamping grooves along the axial direction of the rotor body.

6. A process of assembling a twin stator pm synchronous machine as set forth in claim 1, wherein the axial length of said inner stator is smaller than the axial length of said outer stator.