CN114157069A

CN114157069A - Motors and Electrical Equipment

Info

Publication number: CN114157069A
Application number: CN202111552371.7A
Authority: CN
Inventors: 葛梦; 冯艳丽; 李文瑞
Original assignee: Midea Welling Motor Technology Shanghai Co Ltd; Welling Wuhu Motor Manufacturing Co Ltd
Current assignee: Midea Welling Motor Technology Shanghai Co Ltd; Welling Wuhu Motor Manufacturing Co Ltd
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2022-03-08
Anticipated expiration: 2041-12-17
Also published as: CN114157069B

Abstract

The invention provides a motor and electrical equipment, the motor includes: rotor subassembly, rotor subassembly include rotor core and a plurality of permanent magnet, and rotor core includes: a circular ring part; the plurality of iron core parts protrude out of the inner peripheral wall of the circular ring part and are distributed at intervals in the circumferential direction of the circular ring part, the plurality of permanent magnets are respectively arranged between two adjacent iron core parts, and the polarities of the plurality of permanent magnets are the same; stator module, stator module includes stator core and stator winding, and stator core includes: a yoke portion; the stator main teeth are arranged on the yoke part and comprise tooth shoes, and stator windings are arranged on the stator main teeth; and the at least two stator auxiliary teeth are arranged on the tooth shoe. The invention can reduce the manufacturing difficulty of the alternating-pole rotor, enhance the magnetic field modulation effect, increase the amplitude of the working subflux density harmonic wave and generate better output performance of the motor.

Description

Motor and electrical equipment

Technical Field

The invention relates to the technical field of motors, in particular to a motor and electrical equipment.

Background

In the related technology, the permanent magnet motor has more permanent magnets and higher cost. And for the design scheme with a large number of poles, the number of the permanent magnet blocks is large, the time of an assembly process is long, and the production and manufacturing efficiency is influenced. In addition, in the related technology, an alternating pole structure is adopted, and all N pole permanent magnets or S pole permanent magnets in the original motor are replaced by magnetic conductive iron cores, so that the amplitude of fundamental waves is obviously reduced, and the output performance of the motor is reduced.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art.

To this end, a first aspect of the invention provides an electrical machine.

A second aspect of the invention provides an electrical appliance.

A first aspect of the invention provides an electric machine comprising: rotor subassembly, rotor subassembly include rotor core and a plurality of permanent magnet, and rotor core includes: a circular ring part; the plurality of iron core parts protrude out of the inner peripheral wall of the circular ring part and are distributed at intervals in the circumferential direction of the circular ring part, the plurality of permanent magnets are respectively arranged between two adjacent iron core parts, and the polarities of the plurality of permanent magnets are the same; stator module, stator module includes stator core and stator winding, and stator core includes: a yoke portion; the stator main teeth are arranged on the yoke part and comprise tooth shoes, and stator windings are arranged on the stator main teeth; and the at least two stator auxiliary teeth are arranged on the tooth shoe.

The motor provided by the invention comprises a rotor assembly and a stator assembly. Wherein, rotor subassembly includes rotor core and a plurality of permanent magnet. The rotor core includes a circular ring portion and a plurality of core portions that protrude from an inner peripheral wall of the circular ring portion and are distributed at intervals in a circumferential direction of the circular ring portion. The plurality of permanent magnets are respectively arranged between two adjacent iron core parts, and the polarity of the plurality of permanent magnets is the same. Thus, the plurality of iron core portions and the plurality of permanent magnets are alternately distributed in the circumferential direction of the annular portion.

In particular, a plurality of permanent magnets with the same polarity are respectively arranged between two adjacent iron core parts, and a magnetic structure with alternating poles is generated on a circular ring part of the rotor iron core, so that the rotor iron core is in a salient pole structure. Therefore, the number of the permanent magnets is reduced, the manufacturing difficulty of the alternating-pole rotor is reduced, the magnetic field modulation effect is enhanced, the amplitude of the working subflux density harmonic wave is increased, and the motor has better output performance. In addition, the plurality of iron core parts and the plurality of permanent magnets are alternately distributed on the circular ring part of the rotor iron core, so that the problem that the torque is reduced due to the reduction of the amplitude of the fundamental wave of the magnetic field caused by the reduction of the number of magnetic poles after the adoption of alternate poles in the related technology is solved.

Further, the stator assembly includes a stator core and a stator winding. Further, the stator core includes a yoke portion, a stator main tooth, and at least two stator sub-teeth. The stator main tooth is arranged on the yoke portion, the tooth root of the stator main tooth is connected with the yoke portion, and the tooth top of the stator main tooth is provided with a tooth shoe. In addition, the stator winding is arranged on the stator main tooth, and the tooth boots can play a certain limiting role on the stator winding so as to ensure that the stator winding is stably positioned on the stator main tooth.

Particularly, the tooth shoe is provided with at least two stator secondary teeth, and the stator secondary teeth can be used as a modulating component besides a magnetic conducting component to realize the function of magnetic field modulation. At this time, unlike the conventional permanent magnet motor employed in the related art (slot opening is small, air gap permeance is close to constant). In the electric machine according to the invention, the stator primary tooth is split into at least two stator secondary teeth, so that more harmonic components are introduced into the air gap flux guide. Thus, the performance of the motor is obviously improved. Moreover, the motor is simple in structure and convenient to process and manufacture, the cost of the motor is not obviously increased, and the motor does not generate large vibration and noise.

Therefore, the circular ring part of the rotor core in the motor provided by the invention generates a magnetic structure with alternate poles, and the stator core is provided with at least two stator auxiliary teeth, so that the performance of the motor is obviously improved through the forms of the alternate poles and the main and auxiliary teeth, on one hand, the motor generates better output performance, and on the other hand, the motor does not generate larger vibration and noise.

In some possible designs, the pole pair number Ps ═ ax ± Pr |, a denotes the number of stator primary teeth, x denotes the number of stator secondary teeth per stator primary tooth, and Pr denotes the number of permanent magnets.

In this design, the number of pole pairs Ps of the stator winding satisfies: ps ═ ax ± Pr |. Wherein a represents the number of stator primary teeth, x represents the number of stator secondary teeth on each stator primary tooth, and Pr represents the number of permanent magnets. The new harmonic component in the air gap flux density can be used as the working harmonic of the motor to provide output torque for the motor, so that the torque density of the motor is effectively improved.

Therefore, in the motor provided by the invention, the tooth shoe of the stator main tooth is provided with at least two stator auxiliary teeth, and further, the stator auxiliary teeth are used as modulation parts, so that the effect of magnetic field modulation is realized, more harmonic components are introduced into air gap magnetic conductance, and the performance of the motor is obviously improved. And, the pole pair number Ps of the stator winding satisfies: ps ═ ax ± Pr |. Under the limitation, new harmonic components in the air gap flux density can be used as working harmonics of the motor to provide output torque for the motor, so that the torque density of the motor is effectively improved.

In some possible designs, there is a housing between two adjacent iron cores, and the permanent magnet is located in the housing; wherein, in the circumferential direction of the circular part, the size of the permanent magnet is smaller than the size of the accommodating part.

In this design, a plurality of core portions are spaced apart in the circumferential direction of the annular portion, so that the receiving portion is formed between adjacent two core portions. And, in the circumferencial direction of ring portion, the size of permanent magnet is less than the size of holding portion to guarantee that the permanent magnet can place in the holding portion. Due to the design, the rotor core in the rotor assembly provided by the invention has a simple structure and is convenient to process, manufacture and assemble. Thus, the cost of the rotor assembly can be further reduced on the basis of improving the magnetic field modulation effect.

In some possible designs, there is an air gap between the permanent magnet and the core part in the circumferential direction of the ring part.

In this design, the size of the permanent magnet is smaller than the size of the accommodating portion in the circumferential direction of the annular portion. Thus, a certain air gap exists between the permanent magnet and the iron core part. When the rotor assembly is matched with the stator assembly for use, more harmonic components are introduced into the air gap permeance. When the permanent magnet magnetomotive force and the air gap flux guide containing the harmonic waves act, new harmonic wave components can appear in the air gap flux density, and the new harmonic wave components appearing in the air gap flux density can be used as the working harmonic waves of the motor to provide output torque for the motor, so that the torque density of the motor is effectively improved.

In some possible designs, the size of the air gap is greater than 0mm and less than 3mm in the circumferential direction of the annular portion.

In the design, the size of the air gap influences the operation reliability of the whole rotor assembly, when the air gap is too large, the magnetic resistance is increased, the excitation loss is increased, the magnetization effect of the permanent magnet on the iron core is reduced, and the alternating pole structure cannot be generated. When the air gap is too small, the air gap harmonic magnetic field is increased, and the permanent magnet is easy to collide with the inner wall of the accommodating part during operation, so that the operation reliability is reduced, and the assembly is difficult.

Therefore, the invention optimizes the size of the air gap in the circumferential direction of the circular ring part, ensures that the size of the air gap in the circumferential direction of the circular ring part is more than 0mm and less than 3mm, ensures the magnetization effect of the permanent magnet on the iron core part, and simultaneously ensures the operation reliability of the rotor assembly.

In some possible designs, an included angle γ is formed between the center of the circular ring part and a connecting line between two ends of the permanent magnet, and satisfies 0.9 < γ/(π/(Pr)) < 1.7, where Pr is the number of the permanent magnets.

In this design, be formed with contained angle gamma between the line at the center of ring portion to the both ends of permanent magnet, the existence of contained angle can make air gap magnetic conductance process further change, and magnetic field modulation effect strengthens, and the amplitude of work times magnetic density harmonic increases, and then makes the motor torque who adopts the rotor subassembly further obtain promoting, has also avoided adopting in the traditional permanent-magnet machine that the pole quantity reduces after the alternative pole from this, and magnetic field fundamental wave amplitude descends, leads to the problem that the torque descends.

Further, the included angle gamma of the connecting line from the center of the circular ring part to the two ends of the permanent magnet meets the following requirements: and gamma/(pi/(Pr)) < 1.7, wherein Pr is the number of the permanent magnets, and the working performance of the rotor assembly is good when the included angle gamma meets the condition.

In some possible designs, the permanent magnet includes one of: ferrite or rare earth permanent magnet.

In the design, the permanent magnet can adopt ferrite, and the rare earth permanent magnet has better magnetic conductivity.

In the design, the permanent magnet can also adopt a rare earth permanent magnet, and the magnetism of the rare earth permanent magnet is extremely high.

In some possible designs, the rotor core includes a plurality of punching sheets, the plurality of punching sheets are stacked along an axial direction of the rotor core, and any punching sheet includes a circular ring portion and a plurality of core portions.

In this design, the rotor core includes a plurality of laminations. Wherein, a plurality of punching sheets are stacked along rotor core's axial. Further, either includes a circular portion and at least one core portion. Thus, in the process of manufacturing the rotor core, the rotor core can be manufactured by punching layer by layer.

In some possible designs, the rotor core includes a plurality of segmented cores, and any one of the segmented cores includes an arc portion and at least one core portion, and the at least one core portion is disposed on the arc portion, and the arc portions of two adjacent segmented cores are connected, and the plurality of arc portions form a circular ring portion.

In this design, the rotor core includes a plurality of blocking cores, and a plurality of blocking cores are connected end to end along stator core's circumferencial direction. Wherein, arbitrary piecemeal iron core includes arc portion and at least one iron core portion, and the arc portion of two adjacent piecemeal iron cores is connected, and a plurality of ring portions form above-mentioned ring portion jointly. Thus, in the process of manufacturing the rotor core, the plurality of segmented cores can be connected end to manufacture the rotor core.

Specifically, the rotor core includes a plurality of segmented cores. In this way, the rotor core may be first unwound (either as a strip or as individual segmented cores) during the manufacture of the rotor assembly. Then, permanent magnets are assembled at corresponding positions on each of the segmented cores. Compared with the prior art in which winding operation needs to be performed on an integral iron core, the stacked body provided by the invention has the advantages that the operation space is more large, the assembly difficulty of the permanent magnet is favorably reduced, the winding efficiency is further improved, and the material cost is reduced.

Moreover, on the basis of reducing the assembly difficulty of the permanent magnet, the invention can reduce the rejection rate in the assembly process, thereby reducing the waste and improving the cost rate of the stator core. In addition, the requirement of a single block iron core on the material is low, the utilization rate of the iron core material can be improved, and the material cost of the rotor structure is further reduced.

In some possible designs, the arc parts of two adjacent segmented cores are detachably connected.

In the design, the arc parts of two adjacent segmented iron cores are detachably connected. Thus, the disassembly and assembly of two adjacent block iron cores can be ensured.

In some possible designs, the arc parts of two adjacent segmented cores are welded.

In the design, the arc parts of two adjacent segmented iron cores can be connected by welding. Thus, the connection strength between two adjacent segmented iron cores can be ensured.

In some possible designs, the rotor core includes at least one bar-shaped core, the at least one bar-shaped core is connected end to end and distributed annularly, and a plurality of core portions are arranged on the at least one bar-shaped core at intervals. Specifically, any one strip-shaped iron core comprises a plurality of strip-shaped punching sheets, and the plurality of strip-shaped punching sheets are stacked along the axial direction of the rotor iron core.

In the design, the rotor core comprises at least one strip-shaped iron core, and the at least one strip-shaped iron core is connected end to end and distributed in an annular shape. In addition, a plurality of iron core parts are arranged on at least one strip-shaped iron core at intervals. Thus, in the process of manufacturing the rotor core, at least one bar-shaped core can be connected end to manufacture the rotor core.

Specifically, the rotor core includes at least one bar core. Thus, in the process of manufacturing the rotor assembly, the rotor core may be first unfolded (may be unfolded into one or more strips). And then, assembling permanent magnets at corresponding positions on each strip-shaped iron core. Compared with the prior art in which winding operation needs to be performed on an integral iron core, the stacked body provided by the invention has the advantages that the operation space is more large, the assembly difficulty of the permanent magnet is favorably reduced, the winding efficiency is further improved, and the material cost is reduced.

In some possible designs, the rotor core includes at least one bar-shaped core, the at least one bar-shaped core is spirally distributed along an axial direction of the rotor core, and a plurality of core portions are arranged on the at least one bar-shaped core at intervals.

In this design, rotor core includes at least one bar iron core, and at least one bar iron core is the heliciform along rotor core's axial and distributes. In addition, a plurality of iron core parts are arranged on at least one strip-shaped iron core at intervals. Thus, in the process of manufacturing the rotor core, at least one strip-shaped core can be spirally distributed along the axial direction of the rotor core to manufacture the rotor core.

In the design, a stator slot is arranged between two adjacent stator main teeth, and a stator winding is wound on the stator main teeth and is received in the stator slot. In addition, a notch is formed between the tooth shoes of the two adjacent stator main teeth, the notch is communicated with the stator slot, and workers can wind the stator winding on the stator main teeth through the notch.

Furthermore, in the motor provided by the invention, each coil of the stator winding is only wound on one stator main tooth, namely, a single-tooth winding concentrated winding structure is adopted, and the end part of the motor winding is smaller, so that the copper consumption is reduced, the modularization is convenient to realize, and the production and manufacturing efficiency is improved.

In some possible designs, there is a groove between two adjacent stator secondary teeth; the size of the groove is different from the size of the notch in the circumferential direction of the stator assembly.

In this design, the size of the notch and the size of the groove are not equal in the circumferential direction of the stator core. Specifically, the size of the groove is larger than the size of the notch in the circumferential direction of the stator core. Thus, the uniformity of the stator secondary teeth on the circumference is changed, namely, the period number of the air gap permeance is reduced, and the working harmonic wave of the air gap magnetic density is the pole pair number: l Pr ± i × Zf | (i ═ 0, 1, 2 … …), Zf being the number of permeance cycles of the air gap; when the number of the permeance cycles of the air gap is reduced, the flux density harmonic component generated by modulation is increased, namely more working harmonics are generated, so that the output torque of the motor is further improved.

Further, the shape of the groove can be designed according to actual conditions. In particular, the recess may be designed as a polygonal groove, an arc-shaped groove, or the like. More specifically, the groove may be designed as a square groove, a trapezoidal groove, a triangular groove, or other polygonal grooves.

In some possible designs, in two adjacent stator secondary teeth, the included angle beta is formed between the tooth body bisector of one stator secondary tooth and the tooth body bisector of the other stator secondary tooth, and the included angle beta is more than or equal to 1 and less than or equal to beta/(2 pi/(ax)) < 1.4, wherein a represents the number of the stator primary teeth, and x represents the number of the stator secondary teeth on each stator primary tooth.

In the design, in two adjacent stator secondary teeth, an included angle beta is formed between a tooth body bisector of one stator secondary tooth and a tooth body bisector of the other stator secondary tooth, and the included angle beta is more than or equal to 1 and less than or equal to beta/(2 pi/(ax)) < 1.4; wherein a represents the number of stator main teeth, and x represents the number of stator secondary teeth on each stator main tooth. Therefore, the structure and distribution of the stator secondary teeth are further optimized, so that the harmonic amplitude generated by the motor is larger, the torque is higher, and the working efficiency of the motor is further improved.

Specifically, the tooth body bisector of the stator secondary tooth is: and on the excircle of the stator core, the middle part of the stator secondary tooth is connected with the center of the stator core.

A second aspect of the present invention provides an electrical apparatus, comprising: the electric machine according to the first aspect of the present invention.

The invention provides electrical equipment which comprises a motor designed according to any one of the above designs. Thus, the overall benefits of the motor described above are achieved and will not be discussed in detail here.

The electrical equipment provided by the invention comprises but is not limited to products such as air conditioners, refrigerators, washing machines and the like.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a rotor assembly in a motor according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a rotor core in the rotor assembly shown in fig. 1;

fig. 3 is a schematic structural view of a rotor core in the motor according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a segmented core in a motor according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a bar-shaped iron core in the motor according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an electric machine according to one embodiment of the present invention;

FIG. 7 is a schematic view of a stator assembly of the electric machine of FIG. 6;

fig. 8 is a schematic view of a stator assembly in an electric machine according to yet another embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 8 is:

100 rotor assembly, 102 rotor core, 104 toroid, 106 core, 108 permanent magnet, 110 pocket, 112 air gap, 114 segmented core, 116 bar core, 200 stator assembly, 202 stator core, 204 yoke, 206 stator primary tooth, 208 tooth shoe, 210 stator secondary tooth, 212 stator winding, 214 stator slot, 216 slot, 218 groove, 220 stack, 230 yoke section, 232 first connection, 234 second connection.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.

Motors and electrical devices provided according to some embodiments of the present invention are described below with reference to fig. 1 to 8. In fig. 7, the broken line represents a bisector of the tooth body of the stator secondary tooth 210.

As shown in fig. 6, a first embodiment of the present invention proposes an electric machine including a rotor assembly 100 and a stator assembly 200.

As shown in fig. 1 and 2, the rotor assembly 100 includes a rotor core 102 and a plurality of permanent magnets 108. The rotor core 102 includes a circular ring portion 104 and a plurality of core portions 106, the plurality of core portions 106 protruding from an inner circumferential wall of the circular ring portion 104, and the plurality of core portions 106 being spaced apart in a circumferential direction of the circular ring portion 104. A plurality of permanent magnets 108 are respectively disposed between two adjacent iron core portions 106, and the polarities of the plurality of permanent magnets 108 are the same. Thus, the plurality of iron core portions 106 and the plurality of permanent magnets 108 are alternately distributed in the circumferential direction of the annular portion 104.

Specifically, as shown in fig. 1 and 2, a plurality of permanent magnets 108 with the same polarity are respectively disposed between two adjacent iron core portions 106, and a magnetic structure with alternating poles is generated on the circular ring portion 104 of the rotor core 102, so that the rotor core 102 has a salient pole structure. Therefore, the using number of the permanent magnets 108 is reduced, the manufacturing difficulty of the alternating-pole rotor is reduced, the magnetic field modulation effect is enhanced, the amplitude of the working subflux density harmonic wave is increased, and the motor has better output performance.

In addition, in the invention, the plurality of iron core parts 106 and the plurality of permanent magnets 108 are alternately distributed on the annular part 104 of the rotor core 102, so that the problem of torque reduction caused by reduction of the amplitude of the fundamental wave of the magnetic field due to reduction of the number of magnetic poles after the adoption of alternate poles in the related art is also avoided.

Further, as shown in fig. 6 and 7, the stator assembly 200 includes a stator core 202 and a stator winding 212. Further, the stator core 202 includes a yoke portion 204, a stator main tooth 206, and at least two stator sub-teeth 210. The stator main teeth 206 are provided on the yoke portion 204, and the tooth roots of the stator main teeth 206 are connected to the yoke portion 204, and the tooth tips of the stator main teeth 206 are provided with tooth shoes 208. In addition, the stator winding 212 is disposed on the stator main tooth 206, and the tooth shoe 208 can play a certain limiting role on the stator winding 212 to ensure that the stator winding 212 is stably located on the stator main tooth 206.

In particular, as shown in fig. 6 and 7, at least two stator secondary teeth 210 are disposed on the tooth shoe 208, and the stator secondary teeth 210 can also be used as a modulation component in addition to a magnetic conductive component to realize the role of magnetic field modulation. At this time, unlike the conventional permanent magnet motor employed in the related art (slot opening is small, air gap permeance is close to constant). In the proposed electrical machine, the stator primary tooth 206 is split into at least two stator secondary teeth 210, so that more harmonic components are introduced into the air gap flux guide. Thus, the performance of the motor is obviously improved. Moreover, the motor is simple in structure and convenient to process and manufacture, the cost of the motor is not obviously increased, and the motor does not generate large vibration and noise.

Therefore, in the motor provided by the invention, the annular part 104 of the rotor core 102 generates a magnetic structure with alternating poles, and the stator core 202 is provided with at least two stator auxiliary teeth 210, so that the performance of the motor is obviously improved through the forms of the alternating poles and the main and auxiliary teeth, on one hand, the motor generates better output performance, and on the other hand, the motor does not generate larger vibration and noise.

A second embodiment of the present invention provides a motor, further comprising, based on the first embodiment:

as shown in fig. 6 and 7, at least two stator secondary teeth 210 are arranged on the tooth shoe 208 of the stator main tooth 206, and further, the stator secondary teeth 210 are used as a modulation component to realize the function of magnetic field modulation, so that more harmonic components are introduced into the air gap flux guide, and the performance of the motor is obviously improved. The pole pair number Ps ═ ax ± Pr |, a, x, and Pr of the stator winding 212 denote the number of stator main teeth 206, the number of stator sub-teeth 210 per stator main tooth 206, and the number of permanent magnets 108.

Under the limitation, new harmonic components in the air gap flux density can be used as working harmonics of the motor to provide output torque for the motor, so that the torque density of the motor is effectively improved.

A third embodiment of the present invention provides a motor, further comprising, based on the first and second embodiments:

as shown in fig. 1 and 2, a plurality of iron core portions 106 are spaced apart in the circumferential direction of the annular portion 104, so that the receiving portions 110 are formed between adjacent two iron core portions 106. Also, in the circumferential direction of the annular portion 104, the size of the permanent magnet 108 is smaller than that of the accommodating portion 110 to ensure that the permanent magnet 108 can be placed in the accommodating portion 110. Due to the design, the rotor core 102 in the rotor assembly 100 provided by the invention has a simple structure and is convenient to machine, manufacture and assemble. Thus, the cost of the rotor assembly 100 can be further reduced on the basis of improving the magnetic field modulation effect.

A fourth embodiment of the present invention provides a motor, further comprising, based on the first, second and third embodiments:

as shown in fig. 1 and 2, the permanent magnet 108 has a size smaller than that of the accommodating portion 110 in the circumferential direction of the annular portion 104. In this way, a certain air gap 112 exists between the permanent magnet 108 and the core part 106. When the rotor assembly 100 is used in conjunction with the stator assembly 200, more harmonic components are introduced into the air gap 112 permeance.

When the permanent magnet magnetomotive force and the air gap 112 magnetic conductance containing harmonic waves act, new harmonic wave components can appear in the air gap flux density, and the new harmonic wave components appearing in the air gap flux density can be used as working harmonic waves of the motor to provide output torque for the motor, so that the torque density of the motor is effectively improved.

In this embodiment, as shown in fig. 1, the size of the air gap 112 affects the operational reliability of the entire rotor assembly 100, and when the air gap 112 is too large, the magnetic resistance is increased, so that the excitation loss is increased, the magnetization effect of the permanent magnet 108 on the iron core 106 is reduced, and the alternating pole structure cannot be generated. When the air gap 112 is too small, the harmonic magnetic field of the air gap 112 is increased, and the permanent magnet 108 is likely to collide with the inner wall of the accommodating portion 110 during operation, thereby reducing the operation reliability and bringing difficulty to assembly.

Therefore, the present invention optimizes the dimension d1 of the air gap 112 in the circumferential direction of the annular part 104, ensures that the dimension d1 of the air gap 112 in the circumferential direction of the annular part 104 is greater than 0mm and less than 3mm, ensures the magnetization effect of the permanent magnets 108 on the iron core part 106, and ensures the reliability of the operation of the rotor assembly 100.

Specifically, the dimension d1 of the air gap 112 in the circumferential direction of the annular portion 104 may be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 2.8mm, etc., and those skilled in the art can design the rib according to actual needs.

A fifth embodiment of the present invention provides a rotor assembly 100, further comprising, based on the first, second, third and fourth embodiments:

as shown in fig. 1, an included angle γ is formed between the center of the circular ring portion 104 and the connecting line between the two ends of the permanent magnet 108, the existence of the included angle can further change the magnetic conductance process of the air gap 112, the magnetic field modulation effect is enhanced, the amplitude of the working submagnetic flux harmonic wave is increased, and further the motor torque adopting the rotor assembly 100 is further improved, thereby avoiding the problem that the torque is reduced due to the reduction of the number of magnetic poles after the alternating poles are adopted in the conventional permanent magnet motor, and the amplitude of the magnetic field fundamental wave is reduced.

Further, as shown in fig. 1, an included angle γ between the center of the circular portion 104 and a connecting line between two ends of the permanent magnet 108 satisfies: 0.9 < gamma/(pi/(Pr)) < 1.7, where Pr is the number of permanent magnets 108, the rotor assembly 100 performs well when the angle gamma satisfies the above conditions.

On the basis of the first to fifth embodiments, ferrite may be used as the permanent magnet 108, and the rare earth permanent magnet 108 has better magnetic permeability.

On the basis of the first to fifth embodiments, further, the permanent magnet 108 may also be a rare earth permanent magnet 108, and the magnetic property of the rare earth permanent magnet 108 is extremely high.

On the basis of the first to fifth embodiments, further, the rotor core 102 includes a plurality of punched pieces. Wherein, a plurality of punching sheets are stacked along the axial direction of the rotor core 102. Further, either includes a circular portion 104 and at least one core portion 106. Thus, in the process of manufacturing the rotor core 102, it can be manufactured by punching layer by layer.

On the basis of the first to fifth embodiments, further, as shown in fig. 3 and 4, the rotor core 102 includes a plurality of segmented cores 114, and the plurality of segmented cores 114 are connected end to end in the circumferential direction of the stator core 202. Any one of the segmented cores 114 includes an arc portion and at least one core portion 106, the arc portions of two adjacent segmented cores 114 are connected, and the plurality of annular portions 104 jointly form the annular portion 104. In this way, in the process of manufacturing the rotor core 102, a plurality of the segmented cores 114 may be connected end-to-end to manufacture the rotor core 102.

Specifically, as shown in fig. 3 and 4, the rotor core 102 includes a plurality of segmented cores 114. As such, during the manufacture of the rotor assembly 100, the rotor core 102 may be unwound first (either as a strip or as individual segmented cores 114). Then, the permanent magnets 108 are fitted at corresponding positions on each of the segmented cores 114. Thus, compared with the prior art in which the winding operation needs to be performed on the integral iron core, the stacked body provided by the invention has a wider operation space, and is beneficial to reducing the assembly difficulty of the permanent magnet 108, thereby improving the winding efficiency and reducing the material cost.

Moreover, the invention can reduce the rejection rate in the assembly process on the basis of reducing the assembly difficulty of the permanent magnet 108, thereby reducing the waste and improving the cost rate of the stator core. In addition, the requirement of the single segmented iron core 114 on the material is low, the utilization rate of the iron core material can be improved, and the material cost of the rotor structure is further reduced.

Further, as shown in fig. 3 and 4, the arc portions of the two adjacent segmented cores 114 are detachably connected. Thus, the attachment and detachment of the two adjacent segmented cores 114 can be ensured. The arc portions of two adjacent segmented cores 114 may be welded. In this way, the connection strength between the adjacent two segmented cores 114 can be ensured.

On the basis of the first to fifth embodiments, further, as shown in fig. 5, the rotor core 102 includes at least one bar-shaped core 116, and the at least one bar-shaped core 116 is connected end to end and distributed in a ring shape. Further, a plurality of iron core portions 106 are provided at intervals on at least one of the bar-shaped iron cores 116. Thus, in the process of manufacturing rotor core 102, at least one bar-shaped core 116 may be connected end-to-end to manufacture rotor core 102.

Specifically, as shown in fig. 5, the rotor core 102 includes at least one bar-shaped core 116. In this way, in the process of manufacturing the rotor assembly 100, the rotor core 102 may be first unfolded (may be unfolded into one piece, or may be unfolded into a plurality of pieces). Then, the permanent magnets 108 are fitted at corresponding positions on each of the strip cores 116. Thus, compared with the prior art in which the winding operation needs to be performed on the integral iron core, the stacked body provided by the invention has a wider operation space, and is beneficial to reducing the assembly difficulty of the permanent magnet 108, thereby improving the winding efficiency and reducing the material cost.

On the basis of the first to fifth embodiments, further, as shown in fig. 5, the rotor core 102 includes at least one bar-shaped core 116, and the at least one bar-shaped core 116 is spirally distributed along the axial direction of the rotor core 102. Further, a plurality of iron core portions 106 are provided at intervals on at least one of the bar-shaped iron cores 116. Thus, in the process of manufacturing rotor core 102, at least one bar-shaped core 116 may be spirally distributed along the axial direction of rotor core 102 to manufacture rotor core 102.

A sixth embodiment of the present invention provides a motor, further comprising, based on the first, second, third, fourth and fifth embodiments:

as shown in fig. 7, a stator slot 214 is formed between two adjacent stator main teeth 206, and a stator winding 212 is wound around the stator main teeth 206 and received in the stator slot 214. In addition, a notch 216 is formed between the tooth shoes 208 of two adjacent stator main teeth 206, the notch 216 is communicated with the stator slot 214, and a worker can wind the stator winding 212 on the stator main teeth 206 through the notch 216.

Further, in the motor provided by the present invention, as shown in fig. 6, each coil of the stator winding 212 is only wound on one stator main tooth 206, that is, a concentrated winding structure of single-tooth winding is adopted, and at this time, the winding end of the motor is small, which is beneficial to reducing copper consumption, and is convenient for realizing modularization, and improving production and manufacturing efficiency.

A seventh embodiment of the present invention provides a motor, and on the basis of the sixth embodiment, further:

in the circumferential direction of the stator core, as shown in fig. 7, the dimension d3 of the notch 216 is different from the dimension d2 of the groove 218. Specifically, in the circumferential direction of the stator core, the dimension d2 of the groove 218 is greater than the dimension d3 of the slot 216. This changes the uniformity of the circumferential distribution of the stator secondary teeth 210, i.e. reduces the period of the permeance of the air gap 112, where the working harmonics of the air gap flux density are the pole pair numbers: pr ± i × Zf | (i ═ 0, 1, 2 … …), Zf is the number of permeance cycles of the air gap 112; when the number of permeance cycles of the air gap 112 is reduced, the flux density harmonic component generated by modulation is increased, i.e. more working harmonics are generated, so that the output torque of the motor is further improved.

Further, as shown in fig. 7, the shape of the groove 218 can be designed according to actual conditions. In particular, the groove 218 may be designed as a polygonal groove, an arc-shaped groove, or the like. More specifically, the groove 218 may be designed as a square groove, a trapezoidal groove, a triangular groove, or other polygonal groove.

An eighth embodiment of the present invention provides a motor, further comprising, on the basis of the first, second, third, fourth, fifth, sixth and seventh embodiments:

as shown in fig. 7, in two adjacent stator secondary teeth 210, an included angle β is formed between a tooth body bisector of one stator secondary tooth 210 and a tooth body bisector of the other stator secondary tooth 210, and 1 ≦ β/(2 π/(ax)) < 1.4 is satisfied; where a denotes the number of stator primary teeth 206 and x denotes the number of stator secondary teeth 210 on each stator primary tooth 206. Therefore, the structure and distribution of the stator secondary teeth 210 are further optimized, so that the harmonic amplitude generated by the motor modulation is larger, the torque is higher, and the working efficiency of the motor is further improved.

A ninth embodiment of the present invention provides an electric appliance including: a motor as in any preceding embodiment.

The invention provides electrical equipment which comprises a motor according to any one of the embodiments. Thus, the overall benefits of the motor described above are achieved and will not be discussed in detail here.

The tenth embodiment of the present invention provides a motor, which generates and utilizes more working harmonics according to the magnetic field modulation principle, thereby improving the output torque of the motor and the performance of the motor, further improving the flux density harmonic component and the output capability of the motor through the alternating pole design, and simultaneously reducing the usage amount of the permanent magnet 108 and reducing the cost.

In this embodiment, as shown in fig. 6, the motor includes a rotor assembly 100 and a rotor assembly 100, and the rotor assembly 100 are concentrically disposed. The rotor assembly 100 includes a rotor core 102 and a plurality of permanent magnets 108, the rotor core 102 includes a circular ring portion 104 and a plurality of core portions 106, the plurality of core portions 106 are distributed at intervals in a circumferential direction of the circular ring portion 104, the plurality of permanent magnets 108 are respectively disposed between two adjacent core portions 106, and polarities of the plurality of permanent magnets 108 are the same. Thus, the plurality of iron core portions 106 and the plurality of permanent magnets 108 are alternately distributed in the circumferential direction of the annular portion 104.

Further, as shown in fig. 7, the stator core 202 includes: a yoke 204, a stator main tooth 206, at least two stator secondary teeth 210; stator windings 212 are disposed on stator main teeth 206; the stator winding 212 includes a plurality of coils, and each coil is wound around only one of the stator main teeth 206. Stator slots 214 are formed between every two adjacent stator main teeth 206, notches 216 are formed between every two adjacent tooth shoes 208, the notches 216 are communicated with the stator slots 214, and the stator windings 212 are located in the stator slots 214; a groove 218 is formed between two adjacent stator secondary teeth 210.

By the design, the stator secondary teeth 210 on the tooth shoe 208 can be used as a magnetic conducting component and a modulating component, so that the function of magnetic field modulation is realized. At this time, unlike the conventional permanent magnet motor, in the motor of the present invention, the tooth shoe 208 of the stator main tooth 206 is split into a plurality of stator sub-teeth 210, and a large groove 218 is formed between the adjacent stator sub-teeth 210, so that more harmonic components are introduced into the air gap 112 permeance. When the permanent magnet magnetomotive force acts with the air gap 112 permeance containing harmonics, new harmonic components appear in the air gap flux density.

In the embodiment, further, the pole pair number Ps ═ ax ± Pr |, a represents the number of stator main teeth 206, x represents the number of stator sub-teeth 210 on each stator main tooth 206, and Pr represents the number of the plurality of permanent magnets 108, of the stator windings 212. At the moment, new harmonic components in the air gap flux density can be used as working harmonics of the motor to provide output torque for the motor, so that the torque density of the motor is effectively improved.

Moreover, in the present invention, each coil of the stator winding 212 is only wound on one stator main tooth 206, i.e. a concentrated winding structure of single-tooth winding is adopted, and at this time, the end of the motor winding is small, which is beneficial to reducing copper consumption, and is convenient for realizing modularization, and improving production and manufacturing efficiency.

In this embodiment, further, as shown in fig. 8, the stator core 202 includes at least two stacks 220, and the stator core 202 is manufactured by stacking at least two stacks 220. In this way, during the manufacturing process of the stator core 202, a worker may first perform a winding operation or the like on the single stacked body 220. Compared with the prior art in which the winding operation needs to be performed on the integral iron core, the stacked body 220 provided by the invention has a more operation space, and is beneficial to reducing the winding difficulty, further improving the winding work efficiency and reducing the material cost.

In addition, as shown in fig. 8, the present invention can perform winding operation on the single stacked body 220 first, which can effectively increase the winding number of the stator winding, increase the slot filling rate of the stator winding, and improve the output performance of the applied motor. Moreover, the invention can reduce the rejection rate in the winding process on the basis of reducing the winding difficulty, thereby reducing the waste and improving the cost rate of the stator core 202. In addition, the individual stacks 220 have lower material requirements, which can improve the utilization rate of the core material, thereby reducing the material cost of the stator core 202.

Specifically, as shown in fig. 8, the stator core 202 further includes a first connection portion 232 and a second connection portion 234. Wherein the first connection 232 is disposed at a first end of the yoke section 230, the first connection 232 is disposed at a second end of the yoke section 230, and the first end and the second end are disposed opposite on the yoke section 230. Moreover, the first connecting portion 232 and the second connecting portion 234 are matched in structure, and self-locking can be achieved by matching the first connecting portion 232 and the second connecting portion 234. Thus, during splicing of the stacks 220, the present invention may connect adjacent two stacks 220 by a first connection 232 and a second connection 234, including the detachable connection of adjacent two stacks 220.

In this embodiment, as shown in fig. 8, one of the first connecting portion 232 and the second connecting portion 234 is a convex portion, and the other is a concave portion. In addition, the shape of the convex part is matched with that of the concave part, the convex part and the concave part can be detachably connected, and the self-locking function is realized. Specifically, the concave portion includes, but is not limited to, polygonal grooves, circular grooves, elliptical grooves; the shape of the convex portion matches the shape of the concave portion.

Further in this embodiment, the stator core 202 also includes a fixing member. Wherein. After the splicing of two adjacent stacked bodies 220 is completed, the whole structure is further fixed through the fixing piece, and the structural stability of the spliced stacked bodies 220 is further improved. Specifically, the fixing member may adopt an insulating frame, so that the insulating frame may fix the stacked body 220 on the basis of ensuring insulation, thereby achieving a multipurpose use of the insulating frame.

In this embodiment, further, as shown in fig. 1 and 2, the rotor assembly 100 adopts an alternating pole structure, which can reduce the usage of the permanent magnet 108 and reduce the cost of the motor. On the other hand, after the alternating poles are adopted, the rotor core 102 is in a salient pole structure, the magnetic conductance of the air gap 112 is further changed, the magnetic field modulation effect is enhanced, the amplitude of the working subflux density harmonic is increased, and the motor torque is further improved. Therefore, the problems that the number of magnetic poles is reduced after the alternating poles are adopted in the traditional permanent magnet motor, the amplitude of the fundamental wave of the magnetic field is reduced, and the torque is reduced are solved.

In this embodiment, further, an included angle γ is formed between the center of the annular ring part 104 and a connecting line between both ends of the permanent magnet 108, and satisfies 0.9 < γ/(π/(Pr)) < 1.7, where Pr is the number of the permanent magnets 108. Like this, the magnetic field modulation effect further strengthens, and the amplitude of the dense harmonic of work order magnetism increases, and then makes the motor torque that adopts rotor subassembly 100 further obtain promoting, has also avoided adopting in the traditional permanent-magnet machine that the pole number reduces after the alternating pole from this, and magnetic field fundamental wave amplitude descends, leads to the problem of torque decline.

In this embodiment, further, in the circumferential direction of the ring portion 104, there is an air gap 112 between the permanent magnet 108 and the core portion 106; and, the size d1 of air gap 112 in the circumferential direction of ring portion 104 is greater than 0mm and less than 3mm, guarantees the magnetization effect of permanent magnet 108 to iron core portion 106, guarantees the reliability of rotor assembly 100 operation simultaneously. At this time, the motor output performance is excellent.

In this embodiment, further, the permanent magnet 108 material may be ferrite or a rare earth permanent magnet. Specifically, the permanent magnet 108 may be ferrite, and the rare earth permanent magnet 108 has good magnetic permeability. Specifically, the permanent magnet 108 may also be a rare earth permanent magnet 108, and the magnetic properties of the rare earth permanent magnet 108 are extremely high.

In this embodiment, further, the rotor core 102 may include a plurality of laminations, each of which is stacked in an axial direction of the rotor core 102 and includes a circular portion 104 and at least one core portion 106.

In this embodiment, further, the rotor core 102 may include a plurality of segment cores 114, and the plurality of segment cores 114 are connected end to end in the circumferential direction of the stator core 202. Any one of the segmented cores 114 includes an arc portion and at least one core portion 106, the arc portions of two adjacent segmented cores 114 are connected, and the plurality of annular portions 104 jointly form the annular portion 104.

In this embodiment, further, the rotor core 102 may include at least one bar-shaped core 116, the at least one bar-shaped core 116 is connected end to end and distributed in a ring shape, and a plurality of core portions 106 are disposed on the at least one bar-shaped core 116 at intervals. Specifically, any one of the bar-shaped cores 116 includes a plurality of bar-shaped stamped pieces, and the plurality of bar-shaped stamped pieces are stacked along the axial direction of the rotor core 102.

In this embodiment, further, the rotor core 102 may be a bar-shaped core 116, and at least one bar-shaped core 116 is connected end to end and distributed in a ring shape. Further, a plurality of iron core portions 106 are provided at intervals on at least one of the bar-shaped iron cores 116.

In this embodiment, further, there is a groove 218 between two adjacent stator secondary teeth 210; the dimension d2 of the groove 218 is different from the dimension d3 of the slot 216 in the circumferential direction of the stator assembly 200. This changes the uniformity of the circumferential distribution of the stator secondary teeth 210, i.e. reduces the period of the permeance of the air gap 112, where the working harmonics of the air gap flux density are the pole pair numbers: pr ± i × Zf | (i ═ 0, 1, 2 … …), Zf is the number of permeance cycles of the air gap 112; when the number of permeance cycles of the air gap 112 is reduced, the flux density harmonic component generated by modulation is increased, i.e. more working harmonics are generated, so that the output torque of the motor is further improved.

In the embodiment, further, in two adjacent stator secondary teeth 210, an included angle β is formed between a tooth body bisector of one stator secondary tooth 210 and a tooth body bisector of the other stator secondary tooth 210, and 1 ≦ β/(2 π/(ax)) < 1.4 is satisfied; where a denotes the number of stator primary teeth 206 and x denotes the number of stator secondary teeth 210 on each stator primary tooth 206. Therefore, the structure and distribution of the stator secondary teeth 210 are further optimized, so that the harmonic amplitude generated by the motor modulation is larger, the torque is higher, and the working efficiency of the motor is further improved.

Therefore, in the motor provided by the invention, the plurality of permanent magnets 108 with the same polarity are respectively arranged between two adjacent iron core parts 106, so that the using number of the permanent magnets 108 is reduced, the manufacturing difficulty of the alternating-pole rotor is reduced, the magnetic field modulation effect is enhanced, the amplitude of the working submagnetic density harmonic wave is increased, and the motor generates better output performance. In addition, in the invention, the plurality of iron core parts 106 and the plurality of permanent magnets 108 are alternately distributed on the annular part 104 of the rotor core 102, so that the problem of torque reduction caused by reduction of the amplitude of the fundamental wave of the magnetic field due to reduction of the number of magnetic poles after the adoption of alternate poles in the related art is also avoided.

The tooth shoe 208 is provided with at least two stator sub-teeth 210, and the stator sub-teeth 210 can be used as a modulating component in addition to a magnetic conducting component to realize the function of magnetic field modulation. At this time, unlike the conventional permanent magnet motor employed in the related art (the slot opening is small, the air gap 112 permeance is close to constant). In the proposed machine, the stator primary teeth 206 are split into at least two stator secondary teeth 210, so that more harmonic components are introduced into the air gap 112 permeance. Thus, the performance of the motor is obviously improved. Moreover, the motor is simple in structure and convenient to process and manufacture, the cost of the motor is not obviously increased, and the motor does not generate large vibration and noise.

The number Ps of pole pairs of the stator winding 212 satisfies: ps ═ ax ± Pr |. Where a denotes the number of stator primary teeth 206, x denotes the number of stator secondary teeth 210 per stator primary tooth 206, and Pr denotes the number of permanent magnets 108. Under the limitation, new harmonic components in the air gap flux density can be used as working harmonics of the motor to provide output torque for the motor, so that the torque density of the motor is effectively improved.

In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically limited, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric machine, comprising:

a rotor assembly including a rotor core and a plurality of permanent magnets, the rotor core including:

a circular ring part;

the plurality of iron core parts protrude out of the inner peripheral wall of the circular ring part and are distributed at intervals in the circumferential direction of the circular ring part, the plurality of permanent magnets are respectively arranged between two adjacent iron core parts, and the polarities of the plurality of permanent magnets are the same;

stator module, stator module includes stator core and stator winding, stator core includes:

a yoke portion;

a stator main tooth disposed on the yoke, the stator main tooth including a tooth shoe, the stator winding disposed on the stator main tooth;

and the at least two stator auxiliary teeth are arranged on the tooth shoe.

2. The electric machine of claim 1,

and the number of pole pairs Ps of the stator winding is | ax +/-Pr |, a represents the number of the main stator teeth, x represents the number of the secondary stator teeth on each main stator tooth, and Pr represents the number of the permanent magnets.

3. The electric machine of claim 1,

a containing part is arranged between every two adjacent iron core parts, and the permanent magnet is positioned in the containing part;

wherein, in the circumferential direction of the circular part, the size of the permanent magnet is smaller than the size of the accommodating part.

4. The electric machine of claim 1,

an air gap exists between the permanent magnet and the iron core in a circumferential direction of the circular ring portion.

5. The electric machine of claim 4,

in the circumferential direction of the circular ring part, the size of the air gap is larger than 0mm and smaller than 3 mm.

6. The electric machine according to any of claims 1 to 5,

an included angle gamma is formed between the center of the circular ring part and connecting lines of two ends of the permanent magnet, and the included angle gamma is more than 0.9 and less than gamma/(pi/(Pr)) < 1.7, wherein Pr is the number of the permanent magnets.

7. The electric machine according to any of claims 1 to 5,

the permanent magnet includes one of: ferrite or rare earth permanent magnet.

8. The electric machine according to any of claims 1 to 5,

the rotor core comprises a plurality of punching sheets, the punching sheets are arranged in a stacked mode along the axial direction of the rotor core, and any punching sheet comprises the circular ring portion and at least one iron core portion.

9. The electric machine according to any of claims 1 to 5,

the rotor core includes a plurality of segmented cores;

any one of the iron core blocks comprises an arc part and at least one iron core part, at least one iron core part is arranged on the arc part, two adjacent iron core blocks are connected with the arc part, and the arc parts form the circular ring part.

10. The electric machine of claim 9,

the arc parts of two adjacent blocked iron cores are detachably connected; or

And the arc parts of two adjacent blocked iron cores are welded.

11. The electric machine according to any of claims 1 to 5,

the rotor core comprises at least one strip-shaped iron core, at least one strip-shaped iron core is connected end to end and distributed in an annular mode, and at least one strip-shaped iron core is provided with the plurality of iron core portions at intervals.

12. The electric machine according to any of claims 1 to 5,

the rotor iron core comprises at least one strip-shaped iron core;

at least one the bar iron core is followed rotor core's axial is the heliciform and distributes, at least one the last interval of bar iron core is provided with a plurality of iron core portions.

13. The electric machine according to any of claims 1 to 5,

and a stator slot is arranged between every two adjacent stator main teeth, a notch is arranged between every two adjacent tooth shoes, the notches are communicated with the stator slot, and the stator winding is positioned in the stator slot.

14. The electric machine of claim 13,

a groove is formed between every two adjacent stator secondary teeth;

the size of the groove is different from the size of the notch in the circumferential direction of the stator assembly.

15. The electric machine according to any of claims 1 to 5,

in two adjacent stator secondary teeth, an included angle beta is formed between a tooth body bisector of one stator secondary tooth and a tooth body bisector of the other stator secondary tooth, and the included angle beta is more than or equal to 1/(2 pi/(ax)) < 1.4, wherein a represents the number of the stator main teeth, and x represents the number of the stator secondary teeth on each stator main tooth.

16. An electrical device, comprising:

an electric machine as claimed in any one of claims 1 to 15.