CN214380581U - Permanent magnet synchronous motor and stator assembly - Google Patents

Abstract

The utility model relates to a PMSM and stator module, stator module include first iron core, inboard stator winding, outside stator winding, support frame, set up first bearing, afterbody end cover on the support frame and set up the second bearing on the afterbody end cover. The middle part of the first iron core is provided with a through hole for rotatably accommodating the inner rotor. The inner wall of the through hole and the outer wall of the inner rotor are provided with a first air gap. The inner stator winding and the outer stator winding are arranged on the first iron core, the first iron core is arranged on the support frame, the support frame is arranged on the tail end cover, and the motor shaft is arranged through the first bearing and the second bearing, so that the whole structure is simple, the assembly is convenient, and the assembly efficiency is high; in addition, the tail end cover can improve the protection grade of the motor and prevent sand from entering the motor to cause the motor to be blocked; in addition, stator module is established on the motor shaft through first bearing and second bearing simultaneously for operating stability is better.

Description

Permanent magnet synchronous motor and stator assembly

Technical Field

The utility model relates to the technical field of electric machines, especially, relate to a permanent magnet synchronous motor and stator module.

Background

In recent years, the electric unmanned aerial vehicle is rapidly developed and widely used in the fields of military affairs, public security, agriculture, aerial photography and the like. At present, most unmanned aerial vehicles are driven by permanent magnet synchronous motors. The permanent magnet synchronous motor has the obvious advantages of simple structure, reliable operation, small volume, small mass, less loss, high efficiency, flexible and various shapes and sizes of the motor and the like, and the application field almost extends to various fields of aerospace, national defense, industrial and agricultural production and daily life. A permanent magnet synchronous machine of conventional design includes a rotor assembly and a stator assembly that are rotationally coupled. The rotor assembly is provided with a magnet and the stator assembly is provided with a coil. When the coil of the stator component is electrified, the rotor component can rotate, and the rotor component drives the motor shaft to rotate when rotating. However, in the conventional permanent magnet synchronous motor, the overall structure is complex, the assembly is inconvenient, and the assembly efficiency is low.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to overcome the defects of the prior art, and a permanent magnet synchronous motor and a stator assembly are provided, which can simplify the overall structure, facilitate the assembly, have high assembly efficiency and good operation stability.

The technical scheme is as follows: a stator assembly, comprising: the inner side stator winding and the outer side stator winding are arranged on the first iron core, and the inner side stator winding is close to the through hole relative to the outer side stator winding; the support frame, set up in first bearing, afterbody end cover on the support frame and set up in second bearing on the afterbody end cover, the support frame with the afterbody end cover links to each other, first iron core install in on the support frame, first bearing with the coaxial setting of second bearing is used for installing the motor shaft.

In the stator winding, the inner stator winding and the outer stator winding are arranged on the first iron core, the first iron core is arranged on the support frame, the support frame is arranged on the tail end cover, and the motor shaft is arranged through the first bearing and the second bearing, so that the whole structure is simple, the assembly is convenient, and the assembly efficiency is high; in addition, the tail end cover can improve the protection grade of the motor and prevent sand from entering the motor to cause the motor to be blocked; in addition, stator module is established on the motor shaft through first bearing and second bearing simultaneously for operating stability is better.

In one embodiment, the supporting frame comprises a base plate positioned on one end face of the first iron core and a supporting block wound on the base plate; the end face of the first iron core is provided with a jack matched with the supporting block, and the supporting block is fixedly arranged in the jack; the first bearing is arranged on the base plate, and a first shaft hole used for penetrating through the motor shaft is further formed in the base plate.

In one embodiment, the supporting block is connected with the tail end cover after passing through the jack.

In one embodiment, a first protruding edge is arranged around the first shaft hole on a plate surface of the base plate facing the first iron core, the first protruding edge and the plate surface of the base plate enclose to form a first cavity, and the first cavity is adapted to the first bearing and accommodates and fixes the first bearing.

In one embodiment, the number of the supporting blocks is two or more, the number of the insertion holes is two or more, and the two or more supporting blocks are correspondingly arranged and fixed in the insertion holes.

In one embodiment, a second shaft hole for passing through the motor shaft is formed in the tail end cover, a third protruding edge is arranged on a plate surface of the tail end cover facing the first iron core and surrounding the second shaft hole, the third protruding edge and the plate surface of the tail end cover enclose a second cavity, and the second cavity is adapted to the second bearing and accommodates and fixes the second bearing.

In one embodiment, the first iron core comprises a stator yoke, a plurality of inner stator teeth which are wound at intervals on the inner side of the stator yoke, and a plurality of outer stator teeth which are wound at intervals on the outer side of the stator yoke; the inner stator windings are arranged on the inner stator teeth in a one-to-one correspondence manner; the outer stator windings are a plurality of and are arranged on the outer stator teeth in a one-to-one correspondence mode.

A permanent magnet synchronous machine comprising said stator assembly; the permanent magnet synchronous motor also comprises a rotor assembly which is rotationally connected with the stator assembly, the rotor assembly comprises an inner rotor, an outer rotor and a motor shaft, the inner rotor comprises a second iron core and a first magnet, the first magnet is arranged on the second iron core, the outer rotor comprises a second magnet and a rotor shell, the second magnet is arranged on the rotor shell, the inner rotor, the outer rotor and the motor shaft are coaxially arranged, and the motor shaft penetrates through and is fixedly arranged on the rotor shell and the second iron core; the motor shaft is also rotationally arranged in the first bearing and the second bearing.

In the permanent magnet synchronous motor, the inner stator winding and the outer stator winding are arranged on the first iron core, the first iron core is arranged on the support frame, the support frame is arranged on the tail end cover, and the motor shaft is arranged through the first bearing and the second bearing, so that the permanent magnet synchronous motor has a simple overall structure, is convenient to assemble and has high assembly efficiency; in addition, the tail end cover can improve the protection grade of the motor and prevent sand from entering the motor to cause the motor to be blocked; in addition, stator module is established on the motor shaft through first bearing and second bearing simultaneously for operating stability is better. In addition, on one hand, the motor shaft penetrates through and is fixedly arranged on the rotor shell and the second iron core, so that the motor shaft, the rotor shell and the second iron core can synchronously rotate, namely the rotor shell is connected with the second iron core through the motor shaft, the structure of the permanent magnet synchronous motor is simplified, and the cost can be reduced; on the other hand, the inner rotor and the outer rotor share one motor shaft, so that the situation that a first air gap and a second air gap have large difference due to assembly errors is avoided, uniform air gaps are facilitated, and stable operation of the permanent magnet synchronous motor can be guaranteed.

In one embodiment, a second protruding edge is wound on the rotor housing, a step is arranged on the motor shaft, the second protruding edge extends into the first shaft hole of the support frame and abuts against one end face of the first bearing, and the other end face of the first bearing abuts against one end face of the step. So, the protruding edge of second plays limiting displacement to two terminal surfaces of first bearing with the step, can avoid first bearing to remove in the axial direction of motor shaft.

In one embodiment, an anti-falling assembly is arranged at the end part of the motor shaft, the anti-falling assembly is abutted and in sliding fit with one end surface of the second bearing, and the other end surface of the step is abutted with the other end surface of the second bearing.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments 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 view of a stator assembly according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view at A-A of FIG. 1;

fig. 3 is an exploded schematic view of a stator assembly according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a supporting frame according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a first iron core according to an embodiment of the present invention;

fig. 6 is an exploded schematic view of a permanent magnet synchronous motor according to an embodiment of the present invention;

fig. 7 is an axial cross-sectional view of a permanent magnet synchronous motor according to an embodiment of the present invention;

fig. 8 is a schematic view of a permanent magnet synchronous motor according to an embodiment of the present invention, with the tail end cover, the inner stator winding and the outer stator winding removed;

fig. 9 is a view structural diagram of one of the rotor assemblies according to an embodiment of the present invention;

FIG. 10 is a cross-sectional view at B-B of FIG. 9;

fig. 11 is an exploded view of a rotor assembly according to an embodiment of the present invention;

fig. 12 is a schematic diagram of a control circuit of a driving system according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of a circuit board of a driving system according to an embodiment of the present invention.

10. A stator assembly; 11. a first iron core; 111. a through hole; 112. a jack; 113. a stator yoke; 114. inner stator teeth; 115. outer stator teeth; 12. an inner stator winding; 121. a first phase winding; 122. a second phase winding; 123. a third phase winding; 13. an outer stator winding; 131. a first phase winding; 132. a second phase winding; 133. a third phase winding; 14. a support frame; 141. a substrate; 1411. a first shaft hole; 1412. a first convex edge; 142. a support block; 15. a first bearing; 16. a tail end cover; 161. a second shaft hole; 162. a third convex edge; 17. a second bearing; 18. an anti-drop component; 181. a snap ring; 182. a wear-resistant washer; 183. a locking member; 20. a rotor assembly; 21. an inner rotor; 211. a second iron core; 2111. a first groove; 2112. a fourth shaft hole; 212. a first magnet; 22. an outer rotor; 221. a second magnet; 222. a rotor housing; 2221. a head end cap; 2222. enclosing plates; 2223. a third shaft hole; 2224. a flange; 2225. a card slot; 2226. a second convex edge; 23. a motor shaft; 231. a first anti-slip portion; 232. a second anti-slip portion; 233. a step; 31. a first air gap; 32. a second air gap; 40. a circuit board; 41. a first driver chip; 42. a second driver chip; 43. a first conductive line; 44. a second conductive line; 451. a first wiring portion; 452. a second wiring portion; 453. a third wiring portion; 454. a fourth wiring portion; 455. a fifth wiring portion; 46. a MOS element; 47. a capacitor; 48. a power line.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

Referring to fig. 1 to 3, fig. 1 shows a view structure diagram of a stator assembly 10 according to an embodiment of the present invention, fig. 2 shows a cross-sectional view of fig. 1 at a-a, and fig. 3 shows an exploded view structure diagram of the stator assembly 10 according to an embodiment of the present invention. An embodiment of the utility model provides a stator assembly 10, stator assembly 10 includes: the stator comprises a first iron core 11, an inner stator winding 12, an outer stator winding 13, a support frame 14, a first bearing 15 arranged on the support frame 14, a tail end cover 16 and a second bearing 17 arranged on the tail end cover 16. The first core 11 is provided at a central portion thereof with a through hole 111 for rotatably receiving the inner rotor 21. The inner wall of the through hole 111 and the outer wall of the inner rotor 21 are provided with a first air gap 31. The inner stator winding 12 and the outer stator winding 13 are both disposed on the first core 11, and the inner stator winding 12 is close to the through hole 111 with respect to the outer stator winding 13. The supporting frame 14 is connected with the tail end cover 16, and the first iron core 11 is arranged on the supporting frame 14. The first bearing 15 is arranged coaxially with the second bearing 17 and is used for mounting a motor shaft 23.

The stator winding, the inner stator winding 12 and the outer stator winding 13 are arranged on the first iron core 11, the first iron core 11 is arranged on the support frame 14, the support frame 14 is arranged on the tail end cover 16, and the motor shaft 23 is arranged through the first bearing 15 and the second bearing 17, so that the whole structure is simple, the assembly is convenient, and the assembly efficiency is high; in addition, the tail end cover 16 can improve the protection grade of the motor and prevent sand from entering the motor to cause the motor to be blocked; in addition, the stator assembly 10 is simultaneously arranged on the motor shaft 23 through the first bearing 15 and the second bearing 17, so that the operation stability is better.

Referring to fig. 3 to 5, fig. 4 shows a schematic structural diagram of the supporting frame 14 according to an embodiment of the present invention, and fig. 5 shows a schematic structural diagram of the first iron core 11 according to an embodiment of the present invention. Further, the supporting frame 14 includes a base plate 141 located on one end surface of the first core 11 and a supporting block 142 wound on the base plate 141. The end face of the first core 11 is provided with an insertion hole 112 corresponding to the supporting block 142, and the supporting block 142 is fixedly arranged in the insertion hole 112. The first bearing 15 is disposed on the base plate 141, and the base plate 141 is further provided with a first shaft hole 1411 for passing the motor shaft 23. Thus, the supporting frame 14 is assembled with the first core 11 by fixing the supporting block 142 to the insertion hole 112, so that the assembly operation between the supporting frame 14 and the first core 11 is more convenient and the assembly efficiency is higher.

It should be noted that, there are many embodiments of the specific way of fixing the supporting block 142 to the insertion hole 112, for example, the supporting block 142 and the hole wall of the insertion hole 112 are fixed by adhesive, and for example, the supporting block 142 and the insertion hole 112 are fixed in an interference fit manner, and for example, the supporting block 142 and the insertion hole 112 are fixed in a snap fit manner, and the specific fixing manner is not limited herein.

Referring to fig. 3, 6 and 7, fig. 6 is an exploded schematic view of a permanent magnet synchronous motor according to an embodiment of the present invention, and fig. 7 is an axial sectional view of a permanent magnet synchronous motor according to an embodiment of the present invention. Further, the support block 142 is connected to the tail end cap 16 after passing through the insertion hole 112. Specifically, the tail end cap 16 is, for example, in close contact with the supporting block 142 and is fixed together by screws, pins, rivets or glue.

Referring to fig. 3, 6 and 7, further, a first protruding edge 1412 is disposed around the first axis hole 1411 on the plate surface of the base plate 141 facing the first core 11, the first protruding edge 1412 and the plate surface of the base plate 141 enclose to form a first cavity, and the first cavity is adapted to the first bearing 15 and accommodates and fixes the first bearing 15. In this way, the first bearing 15 is stably mounted on the substrate 141, which is beneficial to improving the performance of the motor.

It should be noted that there are many embodiments of the manner of accommodating and fixing the first bearing 15 in the first chamber, for example, the outer wall of the first bearing 15 and the inner wall of the first chamber are fixed by gluing, and for example, the outer wall of the first bearing 15 and the inner wall of the first chamber are fixed and combined together by tightly fitting, and the like, and the embodiments are not limited herein.

It should be noted that, in the infringement comparison, the "supporting block 142" may be a "part of the substrate 141", that is, the "supporting block 142" is integrally formed with "other parts of the substrate 141"; or a separate member that is separable from the rest of the base plate 141, i.e., the support block 142 may be manufactured separately and then integrated with the rest of the base plate 141. In one embodiment, as shown in FIG. 4, the support block 142 is a part of the first mounting member.

It should be noted that, in infringement contrast, the "first convex edge 1412" may be "a part of the base plate 141", that is, the "first convex edge 1412" is integrally formed with "other parts of the base plate 141"; or a separate member that can be separated from the rest of the base plate 141, i.e., the first ledge 1412 can be manufactured separately and then combined with the rest of the base plate 141 to form a whole. In one embodiment, as shown in FIG. 4, the first ledge 1412 is a portion of the first mounting element that is integrally formed.

Referring to fig. 4, 6 and 7, further, there are more than two supporting blocks 142 and more than two insertion holes 112, and the more than two supporting blocks 142 are correspondingly installed and fixed in the insertion holes 112. Thus, the support frame 14 and the first core 11 can be stably fixed together by installing and fixing the two or more support blocks 142 in the two or more insertion holes 112 of the first core 11.

Referring to fig. 4, 6 and 7, further, a second shaft hole 161 for passing through the motor shaft 23 is formed in the tail end cover 16, a third protruding edge 162 is formed on a plate surface of the tail end cover 16 facing the first iron core 11 around the second shaft hole 161, the third protruding edge 162 and the plate surface of the tail end cover 16 enclose to form a second cavity, and the second cavity is adapted to the second bearing 17 and accommodates and fixes the second bearing 17. In this way, the second bearing 17 is firmly mounted on the tail end cover 16, thereby being beneficial to improving the performance of the motor.

It should be noted that there are many embodiments of the manner of accommodating and fixing the second bearing 17 in the second chamber, for example, the outer wall of the second bearing 17 and the inner wall of the second chamber are fixed by using glue, and for example, the outer wall of the second bearing 17 and the inner wall of the second chamber are fixed and combined together by using a close fit manner, and the like, and the embodiments are not limited herein.

Referring to fig. 4, 6 and 7, in one embodiment, the first core 11 includes a stator yoke 113, a plurality of inner stator teeth 114 wound at intervals on an inner side of the stator yoke 113, and a plurality of outer stator teeth 115 wound at intervals on an outer side of the stator yoke 113. The number of the inner stator windings 12 is several, and the several inner stator windings 12 are correspondingly arranged on the several inner stator teeth 114. The outer stator windings 13 are provided in a plurality, and the outer stator windings 13 are correspondingly provided on the outer stator teeth 115.

Referring to fig. 6 and 7, in one embodiment, a permanent magnet synchronous machine includes the stator assembly 10 according to any of the embodiments. The permanent magnet synchronous machine further includes a rotor assembly 20 rotationally coupled to the stator assembly 10. The rotor assembly 20 includes an inner rotor 21, an outer rotor 22, and a motor shaft 23. The inner rotor 21 includes a second iron core 211 and a first magnet 212, the first magnet 212 is disposed on the second iron core 211, the outer rotor 22 includes a second magnet 221 and a rotor housing 222, the second magnet 221 is disposed on the rotor housing 222, the inner rotor 21, the outer rotor 22 and the motor shaft 23 are coaxially disposed, and the motor shaft 23 penetrates through and is fixedly disposed on the rotor housing 222 and the second iron core 211. The motor shaft 23 is also rotatably disposed in the first bearing 15 and the second bearing 17.

It should be noted that, the inner rotor 21, the outer rotor 22 and the motor shaft 23 are coaxially arranged, which means that the rotation axis of the inner rotor 21, the rotation axis of the outer rotor 22 and the rotation axis of the motor shaft 23 are the same, thereby ensuring stable operation of the permanent magnet synchronous motor.

In the permanent magnet synchronous motor, the inner stator winding 12 and the outer stator winding 13 are arranged on the first iron core 11, the first iron core 11 is arranged on the support frame 14, the support frame 14 is arranged on the tail end cover 16, and the motor shaft 23 is arranged through the first bearing 15 and the second bearing 17, so that the permanent magnet synchronous motor has a simple overall structure, is convenient to assemble and has high assembly efficiency; in addition, the tail end cover 16 can improve the protection grade of the motor and prevent sand from entering the motor to cause the motor to be blocked; in addition, the stator assembly 10 is simultaneously arranged on the motor shaft 23 through the first bearing 15 and the second bearing 17, so that the operation stability is better.

In addition, on one hand, the motor shaft 23 penetrates through and is fixedly arranged on the rotor housing 222 and the second iron core 211, so that the motor shaft 23, the rotor housing 222 and the second iron core 211 can synchronously rotate, that is, the rotor housing 222 is connected with the second iron core 211 through the motor shaft 23, the structure of the permanent magnet synchronous motor is simplified, and the cost can be reduced; on the other hand, the inner rotor 21 and the outer rotor 22 share the motor shaft 23, so that the situation that the first air gap 31 and the second air gap 32 have large difference due to assembly errors is avoided, the realization of uniform air gaps is facilitated, and the stable operation of the permanent magnet synchronous motor can be ensured.

Referring to fig. 4, 6 and 7, further, a second protruding edge 2226 is wound on the rotor housing 222, a step 233 is disposed on the motor shaft 23, the second protruding edge 2226 extends into the first shaft hole 1411 of the support frame 14 and abuts against one end surface of the first bearing 15, and the other end surface of the first bearing 15 abuts against one end surface of the step 233. Thus, the second protruding edge 2226 and the step 233 act as a limit for the two end faces of the first bearing 15, and the first bearing 15 can be prevented from moving in the axial direction of the motor shaft 23. Specifically, the second convex edge 2226 is provided on the end surface of the head end cover 2221 facing the stator assembly 10 and is circumferentially provided around the third shaft hole 2223.

Referring to fig. 4, 6 and 7, further, an anti-separation assembly 18 is disposed on an end of the motor shaft 23, the anti-separation assembly 18 abuts against and is in sliding fit with one end surface of the second bearing 17, and the other end surface of the step 233 abuts against the other end surface of the second bearing 17. Thus, the anti-falling assembly 18 is correspondingly abutted to the two end faces of the step 233 and the second bearing 17, and has a limiting effect on the second bearing 17, so that the motor shaft 23 is more stably and rotatably arranged on the tail end cover 16, and the motor shaft 23 is prevented from moving in the axial direction relative to the tail end cover 16. The anti-falling assembly 18 specifically includes, for example, a snap ring 181 clamped at one end of the motor shaft 23, and a wear-resistant washer 182 sleeved on the motor shaft 23, wherein the wear-resistant washer 182 is disposed between the snap ring 181 and an end surface of the second bearing 17 departing from the substrate 141. In addition, anticreep subassembly 18 still includes retaining member 183, and retaining member 183 installs in the tip of motor shaft 23 and offsets with snap ring 181, plays the effect of further firm snap ring 181 and wear-resisting packing ring 182. The locking member 183 is, for example, a bolt, and the like, and is not limited thereto. The wear-resistant washer 182 is, for example, a copper washer, and facilitates the rotation of the motor shaft 23 relative to the end face of the second bearing 17, thereby improving the operation stability of the motor.

Referring to fig. 8 again, fig. 8 is a schematic view illustrating a permanent magnet synchronous motor according to an embodiment of the present invention without a view angle structure of the tail end cover 16, the inner stator winding 12, and the outer stator winding 13; in addition, a second air gap 32 is formed between the outer wall of the first core 11 and the wall surface of the second magnet 221. Further, the first air gap 31 is a distance between the outer wall of the second core 211 and the end surface of the inner stator tooth 114, and the first air gap 31 is a uniform air gap. The second air gap 32 is a distance between the end surface of the outer stator tooth 115 and the wall surface of the second magnet 221, and the second air gap 32 is a uniform air gap. Specifically, the first air gap 31 is equal to the second air gap 32. So, can guarantee permanent magnet synchronous machine steady operation, can prevent rotor subassembly 20 unilateral magnetic pulling force, lead to rotor subassembly 20 off-centre, prevent that the rotatory back rotor subassembly 20 of motor from sweeping the thorax with stator module 10, causing the dead machine that burns of motor card to can prolong the life of motor.

Referring to fig. 9 to 11, fig. 9 shows a view structure diagram of a rotor assembly 20 according to an embodiment of the present invention, fig. 10 shows a cross-sectional view of fig. 9 at B-B, and fig. 11 shows an exploded structure diagram of the rotor assembly 20 according to an embodiment of the present invention. Further, the rotor housing 222 includes a head end cover 2221 and a shroud 2222 connected to the head end cover 2221. A third shaft hole 2223 is formed in the head end cover 2221, and a fourth shaft hole 2112 is formed in the second core 211 and is coaxial with the third shaft hole 2223. The motor shaft 23 is fixed to the third shaft hole 2223 and the fourth shaft hole 2112.

Referring to fig. 7, 10 and 11, a first anti-slip portion 231 is disposed on an outer wall of the motor shaft 23 corresponding to the third shaft hole 2223. The first anti-slip portion 231 is in close contact fit with the hole wall of the third shaft hole 2223. The outer wall of the motor shaft 23 is provided with a second anti-slip portion 232 at a position corresponding to the fourth shaft hole 2112, and the second anti-slip portion 232 is in close contact fit with the hole wall of the fourth shaft hole 2112. Therefore, when the motor works, the first anti-slip part 231 and the hole wall of the third shaft hole 2223 can generate torque, so that the motor shaft 23 and the rotor shell 222 are prevented from slipping, and the rotor shell 222 and the motor shaft 23 are ensured to rotate synchronously; the second anti-slip part 232 and the hole wall of the fourth shaft hole 2112 can generate torque, so that the phenomenon of slipping of the motor shaft 23 and the inner rotor 21 is prevented, and the synchronous rotation of the motor shaft 23 and the inner rotor 21 is ensured. Specifically, the first and second anti-slip portions 231 and 232 may be, for example, knurled, centistokes, spline shafts, bumps, or the like.

Alternatively, for example, the hole wall of the third shaft hole 2223 may be configured as a spline groove, a projection, or the like, which can also achieve the purpose of preventing the motor shaft 23 and the inner rotor 21 from slipping and preventing the motor shaft 23 and the outer rotor 22 from slipping. Alternatively, the motor shaft 23 and the hole wall of the third shaft hole 2223 may be fixed by adhering with an adhesive, or the motor shaft 23 and the hole wall of the third shaft hole 2223 may be fixed by adhering by welding, riveting, clamping, and the like, which is not limited herein. The fixed fitting relationship between the hole wall of the fourth shaft hole 2112 and the motor shaft 23 is similar to the fixed fitting relationship between the hole wall of the third shaft hole 2223 and the motor shaft 23, and details are not repeated here.

Referring to fig. 7, 10 and 11, further, more than two first grooves 2111 are formed in one end surface of the second iron core 211 around the motor shaft 23 at intervals, the number of the first magnets 212 is more than two, and the more than two first magnets 212 are embedded and fixed in the first grooves 2111 in a one-to-one correspondence manner. Specifically, the number of the first grooves 2111 is four, for example, and the number of the first magnets 212 is four, for example. Of course, the number of the first grooves 2111 and the number of the first magnets 212 may be other, and is not limited herein.

Referring to fig. 7, 10 and 11, the first magnet 212 is further V-shaped. In addition, the first magnet 212 protrudes outside one of the end surfaces of the second iron core 211 or the first magnet 212 is flush with one of the end surfaces of the second iron core 211. Therefore, the production and the manufacture are convenient, the assembly is convenient, and the cost is reduced. In addition, the magnetic slot matching relation is considered, the magnetic slot torque of the motor can be reduced, and the motor can rotate more flexibly. It should be noted that the specific shape of the first magnet 212 is not limited to a V shape, and may be other shapes, such as an arc plate, a flat plate, and the like, and is not limited herein.

Referring to fig. 6, further, the number of the second magnets 221 is more than two, and the more than two second magnets 221 are wound and fixed on the rotor housing 222 at intervals; the number of the first magnets 212 is two or more, and the two or more first magnets 212 are embedded and fixed on the second iron core 211 in a one-to-one correspondence manner. The number of the first magnets 212 is less than the number of the second magnets 221. Therefore, the magnetic slot matching relation is considered, the magnetic slot torque of the motor can be reduced, and the motor can rotate more flexibly.

Referring to fig. 7, 10 and 11, further, the rotor housing 222 includes a head end cover 2221 and a shroud 2222 connected to the head end cover 2221. The second magnet 221 is closely attached to the inner wall of the surrounding plate 2222.

Referring to fig. 7, 10 and 11, further, a flange 2224 is wound around a side surface of the head end cap 2221 facing the enclosing plate 2222, and one end of the enclosing plate 2222 is fixed to the flange 2224 in a sleeved manner. The flange 2224 is provided with a slot 2225 corresponding to the second magnet 221, and one end of the second magnet 221 is engaged with the slot 2225. Specifically, the second magnet 221 is fixed to the inner wall of the slot 2225 by adhesive, the second magnet 221 is fixed to the inner wall of the shroud 2222 by adhesive, and the contacting portion of the shroud 2222 and the head end cap 2221 is fixed by adhesive. Therefore, the head end cover 2221, the coaming 2222 and the second magnet 221 can be firmly combined together, and the structural stability of the permanent magnet synchronous motor is guaranteed. Further, the surrounding plate 2222 is fixed to the outer wall of the flange 2224 in a sleeved manner, and the end face of the surrounding plate 2222 is in close contact with the side face of the head end cap 2221 facing the surrounding plate 2222. The second magnet 221 is closely fitted to three side walls of the card slot 2225. Specifically, the adhesive is a resin adhesive, and may be other types of adhesives, which are not limited herein. Alternatively, the second magnet 221, the head end cap 2221, and the shroud 2222 are not limited to being fixed by gluing, but may be assembled and fixed together by using a mounting member such as a screw, a pin, or a rivet.

It should be noted that, in infringement comparison, the "surrounding plate 2222" may be a part of the "head end cap 2221", that is, the "surrounding plate 2222" and the "other part of the head end cap 2221" are manufactured by integral molding; alternatively, a separate component that is separable from the rest of the head end cap 2221, i.e., "the shroud 2222" may be manufactured separately and then combined with the rest of the head end cap 2221 "to form a single unit.

In one embodiment, the motor shaft 23 is a non-magnetic shaft. As described above, the motor shaft 23 is specifically a non-magnetic shaft of type SUS304, and the purpose is to prevent the magnetic path of the second magnet 221 from flowing into the inner rotor 21 when the inner rotor 21 for the motor is operated, and to prevent the second magnet 221 from interfering with the magnetic field of the inner rotor 21 too much. On the contrary, when the outer rotor 22 works, the magnetic conductive path of the first magnet 212 does not flow to the outer rotor 22, and the first magnet 212 can also be prevented from interfering with the magnetic field of the outer rotor 22 too much.

Referring to fig. 7, 12 and 13, fig. 12 is a schematic diagram of a control circuit of a driving system according to an embodiment of the present invention, and fig. 13 is a schematic diagram of a circuit board 40 of the driving system according to an embodiment of the present invention. In one embodiment, the permanent magnet synchronous machine further comprises a drive system. The driving system comprises a first driving chip 41 and a second driving chip 42, the first driving chip 41 is electrically connected with the inner stator winding 12 through a first conducting wire 43, the first driving chip 41 is used for driving the inner stator winding 12 to work, the second driving chip 42 is electrically connected with the outer stator winding 13 through a second conducting wire 44, and the second driving chip 42 is used for driving the outer stator winding 13 to work. In this way, the first driving chip 41 and the second driving chip 42 can control the inner rotor 21 and the outer rotor 22 to work independently according to the actual operation condition of the motor, thereby improving the performance of the motor.

Referring to fig. 7, 12 and 13, in one embodiment, the permanent magnet synchronous motor further includes a circuit board 40, and a first wiring portion 451, a second wiring portion 452, a third wiring portion 453, a fourth wiring portion 454 and a fifth wiring portion 455 electrically connected to the circuit board 40. The inner stator winding 12 and the outer stator winding 13 are both three-phase windings. The first wire portion 451 is connected to the first phase winding 131 of the outer stator winding 13, the second wire portion 452 is connected to the second phase winding 132 of the outer stator winding 13, the third wire portion 453 is connected to the third phase winding 133 of the outer stator winding 13 and the first phase winding 121 of the inner stator winding 12, the fourth wire portion 454 is connected to the second phase winding 122 of the inner stator winding 12, and the fifth wire portion 455 is connected to the third phase winding 123 of the inner stator winding 12.

In addition, the circuit board 40 is further provided with a MOS device 46 and a capacitor 47. The first driving chip 41, the second driving chip 42, the MOS element 46 and the capacitor 47 are all tightly attached to the PCB, and specifically, for example, a chip mounter is used for mounting, so that the production efficiency can be improved. Two power lines 48 are connected to the circuit board 40, and are divided into a positive power line 48 and a negative power line 48.

Generally, in the starting operation stage of the motor, the motor needs a larger torque because of the need to overcome the reaction torque, and the torque of the inner rotor 21 is about 15% higher than that of the outer rotor 22 under the same rotation speed. In addition, in the high-speed operation stage of the motor, the larger the generated tension of the propeller is, the larger the required motor power is, and the higher the torque of the motor is.

Referring to fig. 6 and 7 again, in an embodiment, a working method of the permanent magnet synchronous motor of any one of the above embodiments includes the following steps:

dividing a motor operation stage into a motor starting operation stage, a motor conventional operation stage and a motor high-speed operation stage, wherein the motor starting operation stage is a stage in which the operation speed is less than a first speed, the motor conventional operation stage is a stage in which the operation speed is not less than the first speed and is less than a second speed, and the motor high-speed operation stage is a stage in which the operation speed is not less than the second speed; when the motor is in a starting operation stage or a high-speed operation stage, controlling the inner rotor 21 to work, and controlling the outer rotor 22 to stop working; when the motor is in the normal operation stage, the outer rotor 22 is controlled to work, and the inner rotor 21 is controlled to stop working.

On one hand, the working method of the permanent magnet synchronous motor comprises the technical effects of the permanent magnet synchronous motor, and on the other hand, the inner rotor 21 is controlled to work when the motor is in a starting operation stage or a high-speed operation stage, and the starting current of the motor is more favorably reduced based on that the torque of the inner rotor 21 is about 15% higher than that of the outer rotor 22; when the motor normally runs, the outer rotor 22 is controlled to work, the response based on the outer rotor 22 is faster, the rotating speed stability is higher, and the unmanned aerial vehicle posture can be kept conveniently. Therefore, efficient work of the motor can be guaranteed, the starting speed of the motor is improved, the starting current is reduced, and the redundancy of the motor can be guaranteed.

The first speed and the second speed are set according to actual conditions. For example, the first speed is 0rpm and the second speed is 1000 rpm.

In a specific embodiment, when the rotation speed of the motor is started from 0rpm, the inner stator winding 12 is energized, the first drive IC operates to drive the rotor 21 in the motor to rotate; when the rotating speed of the motor reaches 1000rpm, the second drive IC is switched to work, the outer stator winding 13 is electrified, and the outer rotor 22 is driven to rotate; when the rotating speed of the motor reaches more than 5000rpm, the first drive IC is switched to work again, and the inner rotor 21 is driven to rotate.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims (10)

1. A stator assembly, characterized in that the stator assembly comprises:

the inner side stator winding and the outer side stator winding are arranged on the first iron core, and the inner side stator winding is close to the through hole relative to the outer side stator winding;

the support frame, set up in first bearing, afterbody end cover on the support frame and set up in second bearing on the afterbody end cover, the support frame with the afterbody end cover links to each other, first iron core install in on the support frame, first bearing with the coaxial setting of second bearing is used for installing the motor shaft.

2. The stator assembly according to claim 1, wherein the support frame comprises a base plate located on one end face of the first iron core and a support block wound on the base plate; the end face of the first iron core is provided with a jack matched with the supporting block, and the supporting block is fixedly arranged in the jack; the first bearing is arranged on the base plate, and a first shaft hole used for penetrating through the motor shaft is further formed in the base plate.

3. The stator assembly of claim 2 wherein said support block is connected to said tail end cap after passing through said receptacle.

4. The stator assembly according to claim 2, wherein a first protruding edge is arranged around the first shaft hole on a plate surface of the base plate facing the first iron core, the first protruding edge and the base plate surface enclose a first cavity, and the first cavity is adapted to the first bearing and accommodates and fixes the first bearing.

5. The stator assembly of claim 2, wherein the number of the support blocks is two or more, the number of the insertion holes is two or more, and the two or more support blocks are correspondingly installed and fixed in the insertion holes.

6. The stator assembly of claim 2, wherein the tail end cap defines a second shaft hole for passing through the motor shaft, a third protruding edge is disposed around the second shaft hole on a plate surface of the tail end cap facing the first core, the third protruding edge and the plate surface of the tail end cap enclose a second cavity, and the second cavity is adapted to the second bearing and accommodates and fixes the second bearing.

7. The stator assembly of claim 1, wherein the first core comprises a stator yoke, a plurality of inner stator teeth spaced around an inner side of the stator yoke, and a plurality of outer stator teeth spaced around an outer side of the stator yoke; the inner stator windings are arranged on the inner stator teeth in a one-to-one correspondence manner; the outer stator windings are a plurality of and are arranged on the outer stator teeth in a one-to-one correspondence mode.

8. A permanent magnet synchronous machine comprising a stator assembly according to any of claims 1 to 7; the permanent magnet synchronous motor also comprises a rotor assembly which is rotationally connected with the stator assembly, the rotor assembly comprises an inner rotor, an outer rotor and a motor shaft, the inner rotor comprises a second iron core and a first magnet, the first magnet is arranged on the second iron core, the outer rotor comprises a second magnet and a rotor shell, the second magnet is arranged on the rotor shell, the inner rotor, the outer rotor and the motor shaft are coaxially arranged, and the motor shaft penetrates through and is fixedly arranged on the rotor shell and the second iron core; the motor shaft is also rotationally arranged in the first bearing and the second bearing.

9. The pmsm of claim 8, wherein a second protruding edge is wound around the rotor housing, a step is formed on the motor shaft, the second protruding edge extends into the first shaft hole of the supporting frame and abuts against one end surface of the first bearing, and the other end surface of the first bearing abuts against one end surface of the step.

10. The PMSM of claim 9, wherein an anti-separation assembly is provided on the end of the motor shaft, the anti-separation assembly is in contact with and sliding fit with one end face of the second bearing, and the other end face of the step is in contact with the other end face of the second bearing.

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