CN213243782U - Double-stator permanent magnet synchronous motor - Google Patents
Double-stator permanent magnet synchronous motor Download PDFInfo
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- CN213243782U CN213243782U CN202021449389.5U CN202021449389U CN213243782U CN 213243782 U CN213243782 U CN 213243782U CN 202021449389 U CN202021449389 U CN 202021449389U CN 213243782 U CN213243782 U CN 213243782U
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Abstract
The utility model discloses a double-stator permanent magnet synchronous motor, which comprises a shell, a first end cover and a second end cover, wherein a main shaft is sleeved on the first end cover; the inner side of the second end cover is provided with an inner extension pipe which is sleeved on the main shaft and keeps a gap with the main shaft; the main shaft is connected with a rotor magnetic yoke; the rotor magnetic yoke comprises a radial part sleeved on the main shaft and an axial part parallel to the main shaft, and a plurality of inner magnetic shoes and outer magnetic shoes are respectively arranged on the inner side and the outer side of the axial part of the rotor magnetic yoke; the inner magnetic shoes are correspondingly provided with inner stator assemblies which are sleeved on the inner extension pipe, the outer magnetic shoes are correspondingly provided with outer stator assemblies which are sleeved on the inner circumference of the shell; the double-stator permanent magnet synchronous motor is simple in structure, easy to manufacture and install, stable and adjustable in overall structure, and high in output power and efficiency.
Description
Technical Field
The utility model relates to motor, generator technical field, concretely relates to two stator PMSM.
Background
With the increasingly prominent changes of energy crisis and environmental protection problems, the traditional induction alternating current asynchronous motor (motor, generator) is gradually replaced by a permanent magnet high-efficiency motor, but the permanent magnet high-efficiency motor seen in the market has low efficiency and small power output density because only one stator, an inner stator or an outer stator, uses one pole of a permanent magnet to do work, and has great promotion space in the aspects of conversion efficiency, power density, specific energy and the like.
In 2018, a chinese utility model patent (publication No. CN207184290U) discloses a double-stator permanent magnet synchronous motor, which comprises a front end cover and a rear end cover of a machine body, wherein the rear end cover of the machine body is provided with a middle shaft, an outer stator is fixed on a machine shell, and an inner stator is fixed on the middle shaft. The rotor output end cover bearing and the rotor front end cover bearing are arranged on the middle shaft; the rotor rear end cover and the rotor output end cover are provided with magnetic shoe grooves for installing magnetic shoe combinations; the magnetic tile combination is formed by arranging a magnetic tile in each magnetic tile sleeve; the rotor output end cover and the output shaft are of an integrated structure, and the rotor output end cover is sleeved on a rotor output end cover bearing. The motor can improve output power through the arrangement of double stators, but has the following problems: (1) the structure of the rotor is complex, and the rear end cover and the output end cover of the rotor are required to be installed in a matching way, so that the installation and manufacturing difficulty of the whole rotor is increased; (2) a plurality of groups of bearings are arranged between the rotor and the rear end cover of the casing for supporting, and the rotor obviously has resistance during rotation and energy loss; (4) the inner stator is positioned in a relatively sealed space, the heat dissipation is poor, and an inner stator wire outlet hole is required to be formed; (5) the axial size of the rotor with the structure is larger, and the control of the whole size of the motor is not facilitated.
Disclosure of Invention
The utility model aims at providing a two stator PMSM to the problem that prior art exists.
In order to achieve the above object, the utility model adopts the following technical scheme:
a double-stator permanent magnet synchronous motor comprises a shell, a first end cover and a second end cover, wherein the first end cover and the second end cover are connected to two ends of the shell; the inner side of the second end cover is provided with an inner extension pipe which is sleeved on the main shaft and keeps a gap with the main shaft; the inner extension pipe extends towards the first end cover and keeps a distance with the second end cover, and a rotor magnetic yoke is connected to the position, located at the distance, of the main shaft; the rotor magnetic yoke comprises a radial part sleeved on the main shaft and an axial part parallel to the main shaft, and a plurality of inner magnetic shoes and outer magnetic shoes are respectively arranged on the inner side and the outer side of the axial part of the rotor magnetic yoke; and the inner stator assemblies are correspondingly arranged on the inner magnetic shoes, the inner stator assemblies are sleeved on the inner extension pipe, the outer stator assemblies are correspondingly arranged on the outer magnetic shoes, and the outer stator assemblies are sleeved on the inner circumference of the shell.
The double-stator permanent magnet synchronous motor has the advantages of simple structure, easy manufacture and installation, stable and adjustable overall structure, clear installation structure, no motion interference among components, convenience for small-batch manual assembly production and suitability for large-batch automatic production; the motor is suitable for various permanent magnet synchronous driving occasions such as motors, generators and the like.
The rotor magnetic yoke of the structure is directly sleeved and connected on the main shaft, so that an integral structure can be formed, the integral installation is convenient, and the synchronism and stability of power transmission and rotation transmission can be ensured; a rotating part is also arranged between the rotor and the main shaft, the whole rotor part (comprising a rotor magnetic yoke, an inner magnetic shoe, an outer magnetic shoe and the like) is prevented from being connected or contacting with a moving part outside the main shaft, and energy loss and rotation resistance are reduced;
the both ends of main shaft are connected with first end cover and second end cover through the bearing respectively, and it can play the effect of rotatory support, moreover the rotor yoke is wholly in the partial middle part position of main shaft, holistic equilibrium is better, and the rotatory stability of main shaft also can guarantee, and the problem of motor shake and noise also can be less.
One side of the rotor magnetic yoke, which is close to the second end cover, is provided with a circle of regular openings, so that the installation and the line routing are convenient, the gap and the distance adjustment are convenient, a heat dissipation space communicated with the inside of the whole machine shell is provided for the inner stator assembly, and the improvement of the running performance of the inner stator assembly is facilitated.
Through the combined action of the inner magnetic shoe, the outer magnetic shoe and the inner stator assembly, the energy density of the output power of the motor is obviously improved, and the efficiency and the power of the whole motor are favorably improved.
Further, the rotor magnetic yoke is of an integrally formed structure, and the size of one side, close to the joint with the main shaft, of the radial part is larger than that of one side, close to the joint with the axial part; the axial part and the radial part are in arc transition arrangement at the 90-degree bending connection part.
The size of the connecting part of the rotor magnetic yoke and the main shaft is large, so that the stability of connection can be ensured; the size of other parts is smaller, so that the volume and the weight of a rotor magnetic yoke can be reduced, particularly the size of an axial part at the position where the inner magnetic shoe and the outer magnetic shoe are installed is the smallest, and the size and the weight of the motor are reduced, so that higher transmission power and efficiency are obtained;
the axial part and the radial part are integrally arranged, so that the complexity of assembling the rotor magnet yoke is reduced, and the transmission performance of the whole rotor magnet yoke can be ensured; the arrangement of circular arc transition avoids stress concentration, can disperse stress, and reduces the shaking problem caused by uneven stress.
Furthermore, the inner magnetic shoes and the outer magnetic shoes are correspondingly arranged on the inner side and the outer side of the rotor magnetic yoke one by one, and the plurality of inner magnetic shoes and the plurality of outer magnetic shoes are arranged in a centrosymmetric manner at equal intervals; the arc-direction size of the inner magnetic shoe is smaller than that of the outer magnetic shoe. The uniform distribution, the symmetry and the corresponding arrangement ensure that the motor has reasonable and balanced structure and compact and balanced power output.
Further, the outer stator assembly comprises an outer stator and an outer winding wound on the outer stator, the outer stator is installed on the inner circumferential surface of the casing in a threaded manner, and the outer winding is arranged corresponding to the outer magnetic shoe and keeps a gap.
Further, the inner stator assembly includes an inner stator and an inner winding wound on the inner stator, the inner stator is screw-mounted on an outer circumferential surface of the inner extension pipe, and the inner winding is disposed corresponding to the inner magnetic shoe and maintains a gap.
The inner stator and the outer stator are respectively provided with winding slots for winding, the winding slots are respectively radially and centrally symmetrically arranged and respectively correspond to the inner magnetic tile and the outer magnetic tile; preferably, each inner magnetic tile corresponds to 2-3 winding grooves; each outer magnetic tile corresponds to 3-4 winding grooves; so that the rotor yoke can obtain a higher density power output.
Further, bearings are respectively installed between the main shaft and the first end cover and between the main shaft and the second end cover, and the bearings are respectively arranged on a shaft shoulder of the main shaft.
One end of the main shaft close to the second end cover can not extend out of the second end cover, so that a motor with only one output shaft head is formed; the second end cover can also be extended out to form a motor with a double-shaft head, so that two ends of the main shaft can be connected with other components.
Furthermore, the inner sides of the first end cover and the second end cover are respectively provided with a retaining ring in an opposite manner, and two ends of the inner circumferential surface of the shell are respectively abutted against the retaining rings; the shell, the first end cover and the second end cover are fixed through a plurality of bolts or screws which penetrate axially in a threaded mode.
When the assembly is assembled, the retainer ring can play the role of supporting and pre-connecting, the shell can be clamped on the retainer ring, and the shell is fixed by screwing after the position is adjusted.
Furthermore, the inner extension pipe is integrally formed on the second end cover, the outer circumference of the inner extension pipe is of a stepped structure, and the inner stator assembly is sleeved on the stepped structure; and a groove is formed at the transition position of the inner circumference of the inner extension pipe and the side wall of the second end cover.
The arrangement of the stepped structure is convenient for mounting the inner stator, and the axial movement of the inner stator can be reduced; the groove is convenient for clamping and mounting the bearing, and provides a yielding space for the bearing.
Further, the main shaft, the rotor yoke, the inner stator assembly and the outer stator assembly are coaxially arranged; the main shaft and the rotor magnetic yoke are in an integrally formed structure or are connected through a key. To ensure the coaxiality of these components.
Compared with the prior art, the beneficial effects of the utility model are that: 1. the double-stator permanent magnet synchronous motor has the advantages of simple structure, easy manufacture and installation, stable and adjustable overall structure, clear installation structure, no motion interference among components, convenience for small-batch manual assembly production and suitability for large-batch automatic production; the permanent magnet synchronous driving device is suitable for various permanent magnet synchronous driving occasions such as motors and generators; 2. the rotor is directly connected with the main shaft, so that the whole rotor part is prevented from being connected with or contacting with a moving part outside the main shaft, and the energy loss and the rotation resistance are reduced; 3. the arrangement of the rotor magnetic yoke is convenient for installation, line routing and gap and distance adjustment, and simultaneously provides a heat dissipation space communicated with the interior of the whole machine shell for the inner stator assembly, thereby being beneficial to improving the running performance of the inner stator assembly; 4. through the combined action of the inner magnetic shoe, the outer magnetic shoe and the inner stator component, the energy density of the output power of the motor is obviously improved, and the efficiency and the power of the whole motor are improved; 5. the rotor magnetic yoke with the structure can not only ensure the stability of connection, but also reduce the size and the weight of the motor so as to obtain higher transmission power and efficiency; meanwhile, stress concentration is avoided, stress can be dispersed, and the problem of shaking caused by uneven stress is reduced.
Drawings
Fig. 1 is a schematic cross-sectional view of a partial structure of a double-stator permanent magnet synchronous motor according to the present invention;
fig. 2 is a schematic cross-sectional structure diagram of a rotor yoke and inner and outer magnetic shoe portions of a double-stator permanent magnet synchronous motor according to the present invention;
fig. 3 is a schematic structural diagram of a second end cover of a double-stator permanent magnet synchronous motor according to the present invention;
FIG. 4 is an enlarged schematic view at A of FIG. 1;
in the figure: 1. a housing; 2. a first end cap; 3. a second end cap; 4. a main shaft; 5. an inner extension tube; 6. a rotor yoke; 601. a radial portion; 602. an axial portion; 7. an inner magnetic shoe; 8. an outer magnetic shoe; 9. an inner stator assembly; 901. an inner stator; 902. an inner winding; 10. an outer stator assembly; 1001. an outer stator; 1002. an outer winding; 11. a first bearing; 12. a second bearing; 13. a retainer ring; 14. a stepped structure; 15. and (4) a groove.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to 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 the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, 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 and 2, a double-stator permanent magnet synchronous motor includes a casing 1, and a first end cover 2 and a second end cover 3 connected to two ends of the casing 1, wherein a main shaft 4 is sleeved on the first end cover 2, and the main shaft 4 penetrates through the first end cover 2 and extends toward the second end cover 3; an inner extension pipe 5 is arranged on the inner side of the second end cover 3, and the inner extension pipe 5 is sleeved on the main shaft 4 and keeps a gap with the main shaft 4; the inner extension pipe 5 extends towards the first end cover 2 and keeps a distance with the first end cover 2, and a rotor yoke 6 is connected to the position, located at the distance, of the main shaft 4; the rotor magnetic yoke 6 comprises a radial part 601 sleeved on the main shaft 4 and an axial part 602 parallel to the main shaft 4, and a plurality of inner magnetic shoes 7 and outer magnetic shoes 8 are respectively arranged on the inner side and the outer side of the axial part 602 of the rotor magnetic yoke 6; a plurality of inner magnetic shoes 7 are correspondingly provided with inner stator assemblies 9, the inner stator assemblies 9 are sleeved on the inner extension pipe 5, a plurality of outer magnetic shoes 8 are correspondingly provided with outer stator assemblies 10, and the outer stator assemblies 10 are sleeved on the inner circumference of the machine shell 1.
The double-stator permanent magnet synchronous motor has the advantages of simple structure, easy manufacture and installation, stable and adjustable overall structure, clear installation structure, no motion interference among components, convenience for small-batch manual assembly production and suitability for large-batch automatic production; the motor is suitable for various permanent magnet synchronous driving occasions such as motors, generators and the like.
The rotor magnetic yoke 6 of the structure is directly sleeved and connected on the main shaft 4, so that an integral structure can be formed, the integral installation is convenient, and the synchronism and stability of power transmission and rotation transmission can be ensured; a rotating part is also arranged between the rotor and the main shaft 4, the whole rotor part (comprising a rotor magnetic yoke, an inner magnetic shoe, an outer magnetic shoe and the like) is prevented from being directly connected or contacting with a moving part outside the main shaft 4, and energy loss and rotation resistance are reduced;
the both ends of main shaft 4 are connected with first end cover 2 and second end cover 3 through the bearing respectively, and it can play the effect of rotatory support, moreover rotor yoke 6 is wholly in the partial middle part position of main shaft 4, holistic equilibrium is better, and the rotatory stability of main shaft 4 also can be guaranteed, and the problem of motor shake and noise also can be less.
One side of the rotor magnetic yoke 6 close to the second end cover 3 is provided with a circle of regular openings, so that the installation and the line routing are convenient, the gap and the distance adjustment are convenient, a heat dissipation space communicated with the inside of the whole machine shell is provided for the inner stator assembly 9, and the improvement of the running performance of the inner stator assembly is facilitated.
Through the combined action of the inner magnetic shoe, the outer magnetic shoe and the inner stator assembly, the energy density of the output power of the motor is improved, and the efficiency and the power of the whole motor can be improved by more than 50%.
Further, the rotor yoke 6 is an integrally formed structure, and the size of the radial portion 601 near the connection with the main shaft 4 is larger than the size of the radial portion 602 near the connection with the axial portion; the axial part 602 and the radial part 601 are in circular arc transition at the 90-degree bending connection.
The connecting part of the rotor yoke 6 and the main shaft 4 is large in size, so that the stability of connection can be ensured; the sizes of other parts are smaller, so that the volume and the weight of the rotor magnetic yoke 6 can be reduced, particularly the thickness of an axial part at the position where the inner magnetic shoe and the outer magnetic shoe are installed is smaller, and the size and the weight of the motor are reduced, so that higher transmission power and efficiency are obtained;
the axial part 602 and the radial part 601 are integrally arranged, so that the assembly complexity of the rotor yoke 6 is reduced, and the transmission performance as a whole can be ensured; the arrangement of circular arc transition avoids stress concentration, can disperse stress, and reduces the shaking problem caused by uneven stress.
Further, the inner magnetic shoes 7 and the outer magnetic shoes 8 are correspondingly arranged on the inner side and the outer side of the rotor magnetic yoke 6 one by one, and the plurality of inner magnetic shoes 7 and the plurality of outer magnetic shoes 8 are arranged in a centrosymmetric manner at equal intervals; the arc-direction size of the inner magnetic shoe 7 is slightly smaller than that of the outer magnetic shoe 8. The uniform distribution, the symmetry and the corresponding arrangement ensure that the motor has reasonable and balanced structure and compact and balanced power output.
Further, the outer stator assembly 10 includes an outer stator 1001 and an outer winding 1002 wound around the outer stator 1001, the outer stator 1001 is screw-mounted on an inner circumferential surface of the casing 1, and the outer winding 1002 is disposed corresponding to the outer magnetic shoe 8 and maintains a gap.
Further, the inner stator assembly 9 includes an inner stator 901 and an inner winding 902 wound on the inner stator 901, the inner stator 901 is screw-mounted on the outer circumferential surface of the inner extension pipe 5, and the inner winding 902 is disposed corresponding to the inner magnetic shoe 7 and maintains a gap.
Winding slots for winding are respectively arranged on the inner stator 901 and the outer stator 1001, the winding slots are respectively radially and centrally symmetrically arranged and respectively correspond to the inner magnetic shoe 7 and the outer magnetic shoe 8; preferably, each inner magnetic shoe 7 corresponds to 2 half-winding slots; each outer magnetic shoe 8 corresponds to 3 half-winding slots; so that the rotor yoke 6 can obtain a higher density power output.
Further, a first bearing 11 and a second bearing 12 are respectively installed between the main shaft 4 and the first end cap 2 and the second end cap 3, the first bearing 11 is respectively arranged at a shaft shoulder on the main body of the main shaft 4, and the second bearing 12 is arranged at a shaft shoulder at the end of the main shaft 4.
Furthermore, the inner sides of the first end cover 2 and the second end cover 3 are respectively provided with a retaining ring 13, and two ends of the inner circumferential surface of the casing 1 are respectively abutted against the retaining rings 13; the machine shell 1, the first end cover 2 and the second end cover 3 are fixed through screw bolts which axially penetrate through the machine shell.
When the assembly is carried out, the retainer ring 13 can play a role in supporting and pre-connecting, and the casing 1 can be clamped on the retainer ring 13 and then fixed in a threaded manner after the position is adjusted.
Further, as shown in fig. 3 and 4, the inner extension pipe 5 is integrally formed on the second end cap 3, the outer circumference of the inner extension pipe 5 is provided with a stepped structure 14, and the inner stator assembly 9 is sleeved on the stepped structure 14; the transition between the inner circumference of the inner extension pipe 5 and the side wall of the second end cap 3 is provided with a groove 15, and the second bearing 12 is installed at the groove 15.
The step structure 14 is convenient for mounting the inner stator 901, and can reduce the axial movement of the inner stator 901; the groove 15 is convenient for clamping and mounting the bearing, and provides a yielding space for the bearing.
Further, the main shaft 4, the rotor yoke 6, the inner stator assembly 9 and the outer stator assembly 10 are coaxially arranged; the main shaft 4 and the rotor magnetic yoke 6 are of an integrally formed structure. To ensure the coaxiality of these components.
Example two:
the present embodiment provides an assembly method of a double-stator permanent magnet synchronous motor in the first embodiment.
As shown in fig. 1, the installation method includes the steps of:
the method comprises the following steps: preparing a main body component of the motor, wherein the main body component comprises a machine shell 1, a main shaft 4, a first end cover 2, a second end cover 3, a rotor magnetic yoke 6, an inner stator component 9, an outer stator component 10 and a bearing;
step two: an outer stator assembly 10 is sleeved on the inner circumference of the machine shell 1 and fixed, and is used after installation; the inner stator component 9 is sleeved and fixed on the inner side inner extension pipe 5 of the second end cover 3, and is used after installation;
step three: inner magnetic shoes 7 and outer magnetic shoes 8 are respectively and uniformly embedded on the inner side and the outer side of the axial part 602 of the rotor magnetic yoke 6, then the radial part of the rotor magnetic yoke 6 is sleeved on the main shaft 4 and fixed, and the mounting is completed for standby application;
step four: sleeving the main shaft 4 provided with the rotor magnetic yoke 6 in the third step in the second end cover 3, and arranging a second bearing 12 at the end part for supporting and connecting; the inner stator assembly 9 is arranged corresponding to the inner magnetic shoe 7 and keeps a gap;
step five: pre-connecting the machine shell 1 to the inner side of the second end cover 3, and enabling the outer stator assembly 10 and the outer magnetic shoe 8 to be arranged correspondingly and keep a gap; then, sleeving the first end cover 2 on the main shaft 4, pre-connecting the end part of the first end cover with the machine shell 1, and installing a first bearing 11 between the first end cover 2 and the main shaft 4; at the moment, two ends of the shell are just clamped and fixed on the retainer ring 13;
step six: and finely adjusting the axial positions of the main shaft 4, the rotor magnetic yoke 6, the second end cover 3, the first end cover 2 and the machine shell 1, and after the gap and the interval reach preset requirements, fixedly connecting the second end cover 3, the first end cover 2 and the machine shell 1 through a screw rod to finish the installation of the motor main body part.
The installation steps are simple and practical, the operation is easy, and the manual operation and the machine operation can be realized.
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 invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A double-stator permanent magnet synchronous motor comprises a shell, a first end cover and a second end cover, wherein the first end cover and the second end cover are connected to two ends of the shell; the inner side of the second end cover is provided with an inner extension pipe which is sleeved on the main shaft and keeps a gap with the main shaft; the inner extension pipe extends towards the first end cover and keeps a distance with the first end cover, and a rotor magnetic yoke is connected to the position, located at the distance, of the main shaft; the rotor magnetic yoke comprises a radial part sleeved on the main shaft and an axial part parallel to the main shaft, and a plurality of inner magnetic shoes and outer magnetic shoes are respectively arranged on the inner side and the outer side of the axial part of the rotor magnetic yoke; and the inner stator assemblies are correspondingly arranged on the inner magnetic shoes, the inner stator assemblies are sleeved on the inner extension pipe, the outer stator assemblies are correspondingly arranged on the outer magnetic shoes, and the outer stator assemblies are sleeved on the inner circumference of the shell.
2. A double stator permanent magnet synchronous machine according to claim 1, wherein the rotor yoke is of an integrally formed structure, and the radial portion has a larger dimension near a joint with the main shaft than near a joint with the axial portion; the axial part and the radial part are in arc transition arrangement at the 90-degree bending connection part.
3. The double-stator permanent magnet synchronous motor according to claim 1, wherein the inner magnetic shoes and the outer magnetic shoes are installed on the inner side and the outer side of the rotor yoke in a one-to-one correspondence, and a plurality of the inner magnetic shoes and a plurality of the outer magnetic shoes are arranged in a centrosymmetric manner at equal intervals; the arc-direction size of the inner magnetic shoe is smaller than that of the outer magnetic shoe.
4. A double-stator permanent-magnet synchronous motor according to claim 1, wherein the outer stator assembly comprises an outer stator and an outer winding wound around the outer stator, the outer stator is screw-mounted on an inner circumferential surface of the casing, and the outer winding is disposed corresponding to the outer magnetic shoe and maintains a gap.
5. The double stator permanent magnet synchronous motor of claim 1, wherein the inner stator assembly comprises an inner stator and an inner winding wound on the inner stator, the inner stator is screw-mounted on an outer circumferential surface of the inner extension pipe, and the inner winding is disposed corresponding to the inner magnetic shoe with a gap maintained.
6. A double-stator permanent-magnet synchronous motor according to claim 1, wherein bearings are respectively installed between the main shaft and the first and second end covers, and the bearings are respectively arranged at a shoulder of the main shaft.
7. The double-stator permanent magnet synchronous motor according to claim 1, wherein the first end cover and the second end cover are respectively provided with a retaining ring at the inner sides thereof, and two ends of the inner circumferential surface of the casing are respectively abutted against the retaining rings; the shell, the first end cover and the second end cover are fixed through a plurality of bolts or screws which penetrate axially in a threaded mode.
8. The double-stator permanent magnet synchronous motor according to claim 1, wherein the inner extension pipe is integrally formed on the second end cover, the outer circumference of the inner extension pipe is of a stepped structure, and the inner stator assembly is sleeved on the stepped structure; and a groove is formed at the transition position of the inner circumference of the inner extension pipe and the side wall of the second end cover.
9. A double stator permanent magnet synchronous machine according to claim 1, wherein the main shaft, the rotor yoke, the inner stator assembly and the outer stator assembly are all coaxially arranged; the main shaft and the rotor magnetic yoke are in an integrally formed structure or are connected through a key.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113517795A (en) * | 2021-09-07 | 2021-10-19 | 北京精雕科技集团有限公司 | Rotating electric machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113517795A (en) * | 2021-09-07 | 2021-10-19 | 北京精雕科技集团有限公司 | Rotating electric machine |
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