WO2023108887A1 - Stator assembly, motor, and electrical device - Google Patents

Abstract

The present application provides a stator assembly, a motor, and an electrical device. The stator assembly comprises: stator main teeth, wherein each stator main tooth comprises a tooth body and a tooth shoe, the tooth shoe is connected to one end of the tooth body, at least two auxiliary teeth are provided at the end of the tooth shoe furthest from the tooth body, and slots are each formed between two adjacent auxiliary teeth; and permanent magnets provided in the slots. According to the stator assembly provided by the present application, a permanent magnet is provided in a slot between adjacent auxiliary teeth, so that a magnetic flux density harmonic component generated by the modulation between the stator assembly and a rotor assembly is further increased, more working harmonics are generated, and an output torque of the motor is further improved.

Description

Stator assemblies, motors and electrical equipment

This application claims priority to a Chinese patent application with application number "202111552283.7" and application title "Stator Assembly, Motor, and Electrical Equipment" filed with the State Intellectual Property Office of China on December 17, 2021, the entire contents of which are incorporated by reference incorporated in this application.

This application claims priority to a Chinese patent application with application number "202123183358.7" and application title "Stator Assembly, Motor and Electrical Equipment" filed with the State Intellectual Property Office of China on December 17, 2021, the entire contents of which are incorporated by reference incorporated in this application.

technical field

The present application designs the technical field of motors, and in particular, relates to a stator assembly, a motor and an electrical device.

Background technique

In related technologies, how to realize more working harmonics generated by the motor during the operation of the motor, so as to increase the output torque of the motor, has become an urgent problem to be solved.

application content

This application aims to solve at least one of the technical problems existing in the prior art.

To this end, the first aspect of the present application provides a stator assembly.

The second aspect of the present application provides a motor.

The third aspect of the present application provides an electrical device.

The first aspect of the present application provides a stator assembly, including: main teeth of the stator, the main teeth of the stator include a tooth body and a tooth shoe, the tooth shoe is connected to one end of the tooth body; the end of the tooth shoe away from the tooth body is provided with at least two There are two auxiliary teeth, and there is a groove between two adjacent auxiliary teeth; the permanent magnet is arranged in the groove.

The stator assembly proposed in this application includes the main teeth of the stator. The main teeth of the stator include a tooth body and a tooth shoe. The tooth shoe is connected to one end of the tooth body. Further, the other end of the tooth body can be connected to the stator yoke, so The connection between the main teeth of the stator and the stator yoke can further provide windings on the main teeth of the stator to cooperate with the magnetic field of the rotor permanent magnet in the rotor assembly of the motor when energized, thereby realizing the rotation of the rotor assembly.

Further, at least two auxiliary teeth are provided on the end of the tooth shoe away from the tooth body. Through the arrangement of the auxiliary teeth, on the one hand, the auxiliary teeth can be used as magnetic conductive parts for magnetic conduction, and on the other hand, the auxiliary teeth can also be used as modulation Components, to achieve the role of magnetic field modulation, so that more harmonic components are introduced into the air gap permeance, so that the performance of the motor has been significantly improved.

Further, the stator assembly also includes permanent magnets, which are arranged in the grooves. Through the arrangement of the permanent magnets, the permanent magnets can generate working harmonics through the modulation of the rotor teeth on the rotor assembly during the operation of the motor. At the same time, the rotor permanent magnet on the rotor assembly can also modulate the working harmonics through the main teeth of the stator, so that the magnetic density harmonic component modulated between the stator assembly and the rotor assembly is further increased, thereby generating more working harmonics , to further increase the output torque of the motor.

Specifically, the number of pole pairs of working harmonics generated between the permanent magnets in the stator assembly and the rotor teeth is: |Par±i×Pr|, and the poles of the working harmonics modulated by the magnetic components on the rotor assembly through the main teeth of the stator The logarithm is: ∣Pr±i×Zf∣, where Zf is the number of air gap permeance periods on the stator side, Par is the number of pole pairs of the permanent magnet in the stator, Pr is the number of pole pairs of the rotor assembly, and i is greater than or equal to Integer of 0.

In the stator assembly provided by this application, through the arrangement of the auxiliary teeth, the auxiliary teeth can not only be used as the magnetic conductive parts, but also can be used as the modulation parts to realize the function of magnetic field modulation, so that more harmonic components are introduced into the air gap magnetic conductance. In this way, The performance of the motor has been significantly improved. On this basis, by arranging permanent magnets in the grooves between adjacent auxiliary teeth, the magnetic density harmonic components modulated between the stator assembly and the rotor assembly are further increased, thereby generating more working harmonics, Further increase the output torque of the motor.

According to the stator assembly provided by this application, it may also have the following additional technical features:

In the above technical solution, further, the permanent magnet includes: a first permanent magnet arranged in the groove; a second permanent magnet arranged in the groove, and the second permanent magnet is located on the side of the first permanent magnet; The magnetization direction of the permanent magnet is opposite to that of the second permanent magnet.

In this technical solution, in the axial direction of the stator assembly, the permanent magnet can be divided into two parts, that is, the permanent magnet includes a first permanent magnet and a second permanent magnet, and the second permanent magnet is located on the side of the first permanent magnet. part, and the magnetization direction of the first permanent magnet is opposite to the magnetization direction of the second permanent magnet, specifically, the magnetization direction of the first permanent magnet can be N/S pole, and correspondingly, the second permanent magnet The magnetization direction is S/N pole.

Through the axial segmental arrangement of the permanent magnets of the stator assembly, the axial segmental design of the rotor assembly of the motor can be matched, specifically, the magnetic components in the rotor assembly can also be divided into two parts in the axial direction, and the rotor assembly The magnetization direction of the magnetic components in the stator corresponds to the magnetization direction of the permanent magnet in the stator, that is, the magnetization direction of the part of the rotor permanent magnet corresponding to the first permanent magnet is set as N/S pole, which is the same as the magnetization direction of the first permanent magnet. The magnetization direction of the corresponding part of the two permanent magnets is the S/N pole, so that the phase difference of the induced back EMF of the armature winding of the two side motors is 180°, and finally the amplitude of the fundamental wave remains basically unchanged, but the harmonic content is greatly increased. Reduce, especially the even harmonics in the synthesized back EMF, thereby reducing motor cogging torque and torque ripple.

In any one of the above technical solutions, further, the stator assembly further includes a magnetic spacer block disposed between the first permanent magnet and the second permanent magnet.

In this technical solution, by arranging a magnetic spacer between the first permanent magnet and the second permanent magnet, it is possible to effectively avoid the mutual interference of the magnetic fields generated between the first permanent magnet and the second permanent magnet with opposite magnetization directions. , to ensure that the first permanent magnet and the second permanent magnet can play their due roles respectively, and ensure that the flux density harmonic component modulated between the stator assembly and the rotor assembly can be further increased, thereby generating more working harmonics , to further increase the output torque of the motor.

In any of the above technical solutions, further, the number of stator main teeth is multiple, and the plurality of stator main teeth are distributed along the circumferential direction of the stator yoke; the number of permanent magnets satisfies: Par=(a-1)×x; Among them, Par is the number of permanent magnets, a is the number of auxiliary teeth on each tooth shoe, and x is the number of main teeth of the stator.

In this technical solution, the number of stator main teeth can be set to be multiple, and the plurality of stator main teeth are distributed along the circumferential direction of the stator yoke, thereby ensuring the number of windings wound on the stator main teeth in the stator assembly, and then Ensure that the magnetic field generated by the permanent magnet can effectively cooperate with the winding during the operation of the motor to ensure the operating efficiency of the motor.

On the basis of multiple stator main teeth, the number of permanent magnets should satisfy: Par=(a-1)×x; where, Par is the number of permanent magnets, a is the number of auxiliary teeth on each tooth shoe, and x is Number of stator main teeth. That is, permanent magnets are arranged in the grooves between any two adjacent auxiliary teeth, so as to ensure that the permanent magnets can generate a magnetic field sufficient to match the rotor assembly during the operation of the motor, and ensure that the permanent magnets can pass through The rotor tooth modulation on the rotor assembly generates sufficient working harmonics to match the working harmonics modulated by the magnetic components on the rotor assembly through the stator main teeth, thereby generating more working harmonics and further increasing the output torque of the motor.

In any of the above technical solutions, further, there is a winding groove between two adjacent tooth bodies, and a notch between two adjacent tooth shoes, and the notch communicates with the winding groove; on the circumference of the stator assembly Orientationally, the size of the groove is not equal to the size of the notch.

In this technical solution, there are winding grooves between the tooth bodies of two adjacent stator main teeth, so that when the winding is wound on the tooth body of the stator main teeth, it can be accommodated in the winding grooves, ensuring the placement position of the winding grooves The rationality, so as to ensure the number of windings, and thus ensure the operating efficiency of the motor.

Further, there is a notch between two adjacent tooth shoes, and the notch communicates with the winding groove. The setting of the notch is beneficial to adjust the harmonic amplitude of the air gap magnetic field and the eddy current density of the rotor, so as to ensure the stability of the motor during operation and reduce the eddy current loss. Specifically, the harmonic amplitude of the air gap magnetic field and the eddy current density of the rotor can be adjusted by setting the width of the notch to meet different operating requirements of the motor.

In the circumferential direction of the stator assembly, the size of the groove between two adjacent auxiliary teeth and the size of the notch between the tooth shoes of two adjacent main teeth of the stator can be set to be unequal.

By setting the size of the groove and the notch to be different, the uniformity of the distribution of the secondary teeth on the circumference of all stator main teeth can be changed, and the number of periods of the air gap permeance is reduced. By making the air gap permeance period As the number decreases, the magnetic density harmonic component generated by modulation will increase, so more working harmonics will be generated, which will further increase the output torque of the motor.

In any of the above technical solutions, further, the at least two auxiliary teeth include first auxiliary teeth and second auxiliary teeth; in the circumferential direction of the stator assembly, the first auxiliary teeth and the second auxiliary teeth are located end.

In this technical solution, the at least two auxiliary teeth include first auxiliary teeth and second auxiliary teeth. Wherein, in the circumferential direction of the stator assembly, the first auxiliary teeth and the second auxiliary teeth are located at opposite ends of the tooth shoes, and slots are formed between adjacent first auxiliary teeth and second auxiliary teeth. In addition, both the above-mentioned first auxiliary teeth and second auxiliary teeth can be used as magnetic field modulation components to improve the performance of the motor to which the stator assembly is applied.

Specifically, the opposite ends of the tooth shoe are respectively provided with a first pair of teeth and a second pair of teeth, and the first pair of teeth and the second pair of teeth are located at the opposite ends of the tooth shoe in the direction of the circumference of the stator assembly. By arranging at least two auxiliary teeth on the tooth shoe, both the first auxiliary teeth and the second auxiliary teeth can be used as magnetic field modulation components to improve the performance of the motor to which the stator assembly is applied.

In any of the above technical solutions, further, in the circumferential direction of the stator assembly, the sizes of the first auxiliary teeth and the second auxiliary teeth are not equal.

In this technical solution, in the circumferential direction of the stator assembly, the sizes of the first auxiliary teeth and the second auxiliary teeth are different. In this way, by limiting the structure of the first auxiliary teeth and the second auxiliary teeth, the distribution of the air gap permeance between the stator assembly and the rotor assembly is effectively optimized, and the harmonic components of the flux density generated by modulation will increase, that is, more With more working harmonics, the output torque of the motor will be further improved.

Specifically, a scheme in which the sizes of the first auxiliary teeth and the second auxiliary teeth are not equal can be adopted, for example, the size of the first auxiliary teeth is set to be larger, and the size of the second auxiliary teeth is set to be smaller. By limiting the structure of the first auxiliary teeth and the second auxiliary teeth to unequal sizes, the distribution of the air gap permeance between the stator assembly and the rotor assembly can be effectively optimized, and the harmonic components of the magnetic flux density generated by modulation will increase. That is, more working harmonics will be generated, and the output torque of the motor will be further increased, thereby improving the operating efficiency of the motor.

In any of the above technical solutions, further, in the radial direction of the stator assembly, an included angle β is formed between the centerlines of two adjacent secondary teeth, and satisfies 1≤β/(2π/(b×x ))<1.4, wherein, b represents the number of main teeth of the stator, and x represents the number of auxiliary teeth on each main tooth of the stator.

In this technical solution, in two adjacent auxiliary teeth, an included angle β is formed between the tooth body bisector of one auxiliary tooth and the tooth body bisector of the other auxiliary tooth, and satisfies 1≤β/(2π/ (b×x))<1.4; wherein, b represents the number of stator main teeth, and x represents the number of auxiliary teeth on each stator main tooth. In this way, the present application further optimizes the structure and distribution of the auxiliary teeth, so that the amplitude of the harmonics generated by the modulation of the motor is larger and the torque is higher, so as to further improve the working efficiency of the motor.

In any of the above technical solutions, further, the distance from the tooth body bisector of the main teeth of the stator to the two side walls of the groove is equal or different.

In this technical solution, there is a groove between the first auxiliary tooth and the second auxiliary tooth, and the application optimizes the distribution of the groove on the tooth shoe, so that the tooth body bisector of the main tooth of the stator, to the groove The distance between the two sides of the wall is equal or unequal. Such a design realizes the asymmetric arrangement of the tooth shoe (the asymmetric arrangement of the tooth shoe with respect to the bisector of the tooth body of the main tooth). In this way, through the above design, the distribution of air gap permeance can be changed, and some harmonics can be weakened, thereby reducing torque ripple and improving the vibration and noise performance of the motor.

Specifically, in the stator assembly proposed in the present application, grooves are formed between two adjacent auxiliary teeth, so that more harmonic components are introduced into the air gap permeance. When the magnetomotive force of the permanent magnet interacts with the air-gap permeance containing harmonics, new harmonic components will appear in the air-gap flux density. Then design the stator winding according to this harmonic component, and 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, thereby effectively improving the torque density of the motor.

In any of the above technical solutions, further, the stator assembly includes a stator yoke; one end of the tooth body is connected to the stator yoke, and the tooth shoe is arranged at the other end of the tooth body.

In this technical solution, the stator assembly may specifically include a stator yoke and stator main teeth arranged on the stator yoke, wherein the stator main teeth include a tooth body and a tooth shoe, one end of the tooth body is connected with the stator yoke, and the teeth The shoe is connected to the other end of the tooth body, so as to realize the connection between the main teeth of the stator and the yoke of the stator, and then windings can be set on the main teeth of the stator to cooperate with the magnetic field of the permanent magnet of the rotor when energized, thereby realizing Rotation of the rotor assembly.

In any of the above technical solutions, further, the tooth shoe is detachably connected to the tooth body; and/or the tooth body is detachably connected to the stator yoke.

In this technical solution, a detachable connection can be set between the tooth body of the stator main tooth and the tooth shoe, and at the same time, a detachable connection can also be set between the tooth body of the stator main tooth and the stator yoke, that is, , A detachable sheathing assembly structure can be set between the tooth body of the stator main tooth and the stator yoke and the tooth shoe. Through the setting of the detachable sleeve assembly structure between the tooth body, the tooth shoe and the stator yoke, in the process of assembling the stator assembly, the winding can be wound on the tooth body of the main tooth of the stator first, and then the tooth body One end is connected to the stator yoke, and finally the tooth shoe is installed on the other end of the tooth body. In this way, the simplified winding process in the assembly process of the stator assembly is realized, the difficulty of winding is reduced, the slot filling rate of the winding is improved, the output performance of the motor is improved from the perspective of stator preparation, and waste materials are reduced at the same time.

Specifically, the tooth body of the stator main tooth and the stator yoke can be connected through a concave-convex structure, that is, a groove or a protrusion is provided at one end of the stator main tooth body, and correspondingly, at the corresponding position of the stator yoke The protrusions or grooves are arranged on the grooves or the protrusions to cooperate with each other, so that the connection between the body of the main teeth of the stator and the stator yoke can be realized through the cooperation of the grooves and the protrusions.

Correspondingly, the tooth body and the tooth shoe can also be connected by a concave-convex structure, that is, the tooth shoe and the tooth body can be connected by mutually matching protrusions and grooves, so as to simplify the winding process.

In any of the above technical solutions, further, in the radial direction of the stator assembly, the height of the permanent magnet is smaller than the height of the groove.

In this technical solution, from the radial direction of the stator assembly, the relationship between the height of the permanent magnet and the height of the groove is defined, specifically, in the radial direction of the stator assembly, the height of the permanent magnet can be set as It is smaller than the height of the groove, so that the permanent magnet protruding from the outside of the groove can be prevented from affecting the rotation of the rotor, which is beneficial to the rational design of the motor structure and ensures the stability of the motor during operation.

In any of the above technical solutions, further, the shape of the permanent magnet is a polygon or an arc.

Specifically, the permanent magnet can be square or triangular.

In any of the above technical solutions, further, the stator assembly further includes a winding, which is arranged on the main teeth of the stator.

In this technical solution, the stator assembly also includes windings. Wherein, the winding is wound on the main teeth of the stator to ensure the output torque when the motor using the stator assembly is running.

According to the second aspect of the present application, a motor is proposed, including: a rotor assembly; and a stator assembly according to any one of the above technical solutions.

In the motor provided by the present application, the stator assembly can be arranged such that at least a part is located in the rotor assembly, that is, the inner stator structure. Specifically, the stator assembly and the rotor assembly are arranged concentrically to ensure that the rotor assembly can rotate relative to the stator assembly to realize the motor. PTO. Wherein, a part of the stator assembly is located in the rotor assembly, and the stator assembly can also be integrally arranged in the rotor assembly in the axial direction, so as to realize different cooperation modes between the permanent magnets of the rotor assembly and the windings of the stator assembly.

Further, the motor provided by the present application includes the stator assembly according to the first aspect of the present application. Therefore, not only have all the beneficial effects of the above-mentioned stator assembly, but will not be discussed in detail here.

In any of the above-mentioned technical solutions, further, the rotor assembly includes: a rotor core, the rotor core includes a rotor yoke and a plurality of salient poles, the plurality of salient poles are arranged on the rotor yoke, and an installation is formed between adjacent salient poles. The slot; the permanent magnet of the rotor is arranged in the installation slot.

In this technical solution, the rotor assembly includes a rotor core and a plurality of rotor permanent magnets. Wherein, the rotor core includes an annular portion and a plurality of salient poles, the plurality of salient poles protrude from the inner peripheral wall of the annular portion, and the plurality of salient poles are distributed at intervals in the circumferential direction of the annular portion. A plurality of permanent magnets are respectively arranged between two adjacent salient poles, and the magnetization directions of the plurality of permanent magnets are the same. In this way, in the circumferential direction of the annular portion, a plurality of salient poles and a plurality of permanent magnets are alternately distributed.

Further, a plurality of permanent magnets with the same magnetization direction are respectively arranged between two adjacent salient poles, and a magnetic structure of alternating poles is formed on the annular part of the rotor core, so that the rotor core has a salient pole structure. In this way, the number of permanent magnets used is reduced, and the manufacturing difficulty of the alternating pole rotor is reduced, and the magnetic field modulation effect is enhanced, and the amplitude of the working sub-harmonic is increased, so that the motor produces better output performance. Moreover, in this application, a plurality of salient poles and a plurality of permanent magnets are arranged alternately on the ring part of the rotor core, which also avoids the decrease in the number of magnetic poles and the decrease in the amplitude of the fundamental magnetic field after the use of alternating poles in the related art, resulting in Torque drop problem. Moreover, during the operation of the motor, the permanent magnets in the stator assembly can generate working harmonics through the salient pole modulation on the rotor assembly, and at the same time, the rotor permanent magnets on the rotor assembly can also modulate the working harmonics through the main teeth of the stator , so that the flux density harmonic components modulated between the stator assembly and the rotor assembly further increase, thereby generating more working harmonics, and further increasing the output torque of the motor. Specifically, in the axial direction of the rotor core, the rotor core may include two parts, that is, a first rotor core and a second rotor core, and the first rotor core and the second rotor core have the same structure. Further, rotor permanent magnets are arranged between the adjacent salient poles of the first rotor core and the second rotor core, and the center line of the salient poles of the first rotor core is aligned with the rotor in the second rotor core. The centerlines of the permanent magnets are aligned. Correspondingly, the centerlines of the rotor permanent magnets in the first rotor core are aligned with the centerlines of the salient poles of the second rotor core. Further, the rotor permanent magnet in the first rotor core is opposite to the first permanent magnet in the stator assembly, and the magnetization direction is the same, and the rotor permanent magnet in the second rotor core is in the same position as the second permanent magnet in the stator assembly. The positions of the magnets are opposite, and the magnetization direction is the same, that is, the magnetization direction of the rotor permanent magnet in the first rotor core is opposite to that of the rotor permanent magnet in the second rotor core.

Through the above design, the axial section setting of the motor is realized, so that the phase difference of the induced back EMF of the armature winding of the two sections of the side motor is 180°, and finally the amplitude of the fundamental wave remains basically unchanged, but the harmonic content is greatly reduced, especially is the even harmonic in the synthesized back EMF, thereby reducing motor cogging torque and torque ripple.

In any of the above technical solutions, further, the number of pole pairs of the stator assembly is Pa, the number of pole pairs of the permanent magnet is P1, the number of stator main teeth is x, and the number of auxiliary teeth on each stator main tooth is a , the number of pole pairs of the rotor assembly is Pr, where Pa=|a×x±Pr| or Pa=|Pr±P1|.

In this technical solution, by setting the number of pole pairs of the stator assembly and the number of pole pairs of the permanent magnet to meet the preset relationship, the new harmonic components appearing in the air gap magnetic density can be used as the working harmonics of the motor, providing the motor with output torque, thus effectively improving the torque density of the motor.

Specifically, the number of pole pairs of the stator assembly is Pa, the number of pole pairs of the permanent magnet is P1, the number of stator main teeth is x, the number of auxiliary teeth on each stator main tooth is a, and the number of pole pairs of the rotor assembly is Pr, where Pa=|a×x±Pr| or Pa=|Pr±P1|.

Specifically, the stator assembly can adopt six teeth and two splits, that is, x=6, a=2, the number of pole pairs of the stator permanent magnet is 6, and the number of pole pairs of the rotor is 10, then according to the limitation of the modulation relationship on the stator side and the modulation relationship on the rotor side Calculated by the formula, Pa=∣2×6±10|=2 or 22, specifically 2 can be used, or Pa=∣10±6∣=4 or 16, specifically 4 can be used. Therefore, according to the calculation, the optimal number of pole pairs of the stator assembly is 2 or 4.

According to a third aspect of the present application, an electrical device is provided, including the motor according to any one of the above technical solutions.

The electrical equipment provided by the present application includes the motor of any one of the above technical solutions, so it has all the beneficial effects of the motor, and will not be repeated here.

Additional aspects and advantages of the application will become apparent in the description which follows, or may be learned by practice of the application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 shows a schematic structural diagram of a stator assembly provided according to an embodiment of the present application;

Fig. 2 shows a schematic structural view of a stator assembly provided according to another embodiment of the present application;

Fig. 3 shows a schematic structural diagram of a stator assembly provided according to yet another embodiment of the present application;

Fig. 4 shows a schematic structural diagram of a stator assembly provided according to yet another embodiment of the present application;

Fig. 5 shows a schematic structural diagram of a stator assembly provided according to yet another embodiment of the present application;

Fig. 6 shows a schematic structural view of a stator assembly provided according to yet another embodiment of the present application;

Fig. 7 shows a schematic structural diagram of a motor provided according to an embodiment of the present application;

Fig. 8 shows a schematic structural diagram of a motor provided according to another embodiment of the present application;

Fig. 9 shows a schematic structural diagram of a motor provided according to yet another embodiment of the present application;

Fig. 10 shows a schematic structural diagram of a rotor assembly in a motor provided according to an embodiment of the present application;

Fig. 11 shows a schematic structural diagram of a rotor assembly in a motor provided according to another embodiment of the present application;

Fig. 12 shows a schematic structural view of a rotor assembly in a motor provided according to yet another embodiment of the present application;

Fig. 13 shows a graph of the no-load back EMF changing with time during the operation of the motor according to an embodiment of the present application;

Fig. 14 is a schematic diagram showing the variation of the amplitude of each harmonic of the no-load back EMF with time during the operation of the motor according to an embodiment of the present application.

Wherein, the corresponding relationship between reference numerals and component names in Fig. 1 to Fig. 12 is:

100 stator assembly, 102 stator main tooth, 104 tooth body, 106 tooth shoe, 108 auxiliary tooth, 110 permanent magnet, 112 first permanent magnet, 114 second permanent magnet, 118 winding, 120 stator yoke, 122 groove, 124 First auxiliary teeth, 126 second auxiliary teeth, 128 winding slots, 130 notches, 200 motors, 202 rotor assemblies, 204 rotor yokes, 206 rotor permanent magnets, 208 salient poles, 210 rotor cores.

Detailed ways

In order to better understand the above-mentioned purpose, features and advantages of the present application, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

In the following description, many specific details are set forth in order to fully understand the application, but the application can also be implemented in other ways than described here, therefore, the protection scope of the application is not limited by the specific implementation disclosed below. Example limitations.

A stator assembly, a motor and electrical equipment provided according to some embodiments of the present application are described below with reference to FIGS. 1 to 14 . Wherein, line L4 in FIG. 13 represents the curve of the no-load back EMF of the motor 200 in the axial direction changing with time, and L5 represents the curve of the no-load back EMF of the motor 200 in the other axial direction changing with time. In Fig. 14, H1 represents the harmonic amplitude of the no-load back EMF of the motor without axial segment design, and H2 represents the harmonic amplitude of the no-load back EMF of the motor with axial segment design.

The present application proposes a first aspect. As shown in FIG. 1 , FIG. 2 and FIG. 3 , a stator assembly 100 is proposed, including: a stator yoke 120 , stator main teeth 102 and permanent magnets 110 . Among them, the stator main tooth 102 includes a tooth body 104 and a tooth shoe 106, one end of the tooth body 104 is connected with the stator yoke 120, and the tooth shoe 106 is connected with the other end of the tooth body 104; the end of the tooth shoe 106 is far away from the tooth body 104 At least two auxiliary teeth 108 are arranged on the upper part, and there is a groove 122 between two adjacent auxiliary teeth 108 . Further, the permanent magnet 110 is disposed in the groove 122 .

The stator assembly 100 proposed in this application includes the stator main tooth 102, the stator main tooth 102 includes a tooth body 104 and a tooth shoe 106, the tooth shoe 106 is connected with one end of the tooth body 104, further, the other end of the tooth body 104 can be connected with The stator yoke portion 120 is connected to realize the connection between the stator main tooth 102 and the stator yoke portion 120, and then a winding can be arranged on the stator main tooth 102 to achieve permanent contact with the rotor in the rotor assembly 202 of the motor 200 when energized. The magnetic fields of the magnets 206 cooperate to achieve the rotation of the rotor assembly 202 .

Further, at least two auxiliary teeth 108 are provided on the end of the tooth shoe 106 away from the tooth body 104. Through the arrangement of the at least two auxiliary teeth 108, on the one hand, the at least two auxiliary teeth 108 can be used as magnetic conductive parts for magnetic conduction , on the other hand, at least two auxiliary teeth 108 can also be used as modulation components to realize the effect of magnetic field modulation, so that more harmonic components are introduced into the air-gap permeance, so that the performance of the motor is significantly improved.

Further, the stator assembly 100 also includes a permanent magnet 110, the permanent magnet 110 is arranged in the groove 122, through the arrangement of the permanent magnet 110, the permanent magnet 110 can pass through the salient pole 208 on the rotor assembly 202 during the operation of the motor The modulation generates working harmonics. At the same time, the rotor permanent magnet 206 on the rotor assembly 202 can also modulate the working harmonics through the stator main teeth 102, so that the magnetic density generated by the modulation between the stator assembly 100 and the rotor assembly 202 The wave component is further increased, thereby generating more working harmonics, and further increasing the output torque of the motor.

Specifically, the number of working harmonic pole pairs generated between the permanent magnets 110 and the salient poles 208 in the stator assembly 100 is: |Par±i×Pr|, the working harmonic modulated by the magnetic components on the rotor through the stator main teeth 102 The number of pole pairs of the wave is: ∣Pr±i×Zf|, wherein, Zf is the number of air gap permeance periods on the side of the stator assembly 100, Par is the number of pole pairs of the permanent magnet 110 in the stator assembly 100, and Pr is the number of pole pairs of the rotor assembly 202. Pole logarithm, i is an integer greater than or equal to 0.

The stator assembly 100 provided in this application, through the setting of the auxiliary teeth 108, the auxiliary teeth 108 can not only serve as a magnetically conductive part, but also serve as a modulating part to realize the function of magnetic field modulation, so that more harmonic components are introduced into the air gap magnetic conductance , so that the performance of the motor has been significantly improved. On this basis, by arranging the permanent magnet 110 in the groove 122 between the adjacent auxiliary teeth 108, the flux density harmonic component modulated between the stator assembly 100 and the rotor assembly 202 is further increased, thereby generating more The working harmonics further increase the output torque of the motor.

Specifically, the permanent magnet 110 can adopt ferrite, rare earth permanent magnet and other magnets with good magnetic permeability. The permanent magnets 110 may be arranged in a V shape or in a spoke shape. Correspondingly, the cross-section of the groove 122 between the stator main teeth 102 can be set to a shape suitable for the permanent magnet 110 to ensure the stability of the installation of the permanent magnet 110 .

Specifically, as shown in FIG. 1 , the permanent magnets 110 may be arranged in a Halbach Array.

In the above embodiment, further, as shown in FIG. 2 and FIG. 3 , the permanent magnet 110 includes: a first permanent magnet 112 disposed in the groove 122; a second permanent magnet 114 disposed in the groove 122 along the In the axial direction of the stator assembly 100 , the second permanent magnet 114 is located at the side of the first permanent magnet 112 ; the magnetization direction of the first permanent magnet 112 is opposite to that of the second permanent magnet 114 .

In this embodiment, in the axial direction of the stator assembly 100, the permanent magnet 110 can be divided into at least two parts, that is, the permanent magnet 110 includes a first permanent magnet 112 and a second permanent magnet 114, and the second permanent magnet 114 Located on the side of the first permanent magnet 112, and the magnetization direction of the first permanent magnet 112 and the magnetization direction of the second permanent magnet 114 are set to be opposite, specifically, the magnetization direction of the first permanent magnet 112 can be N /S pole, correspondingly, the magnetization direction of the second permanent magnet 114 is S/N pole.

As shown in Figure 13 and Figure 14, through the axial segmental arrangement of the permanent magnet 110 of the stator assembly 100, the axial segmental design of the rotor assembly 202 of the motor can be matched, specifically, the rotor permanent magnet 206 in the rotor assembly 202 is also It can be divided into two parts in the axial direction, and the magnetization direction of the rotor permanent magnet 206 in the rotor assembly 202 corresponds to the magnetization direction of the permanent magnet 110 in the stator, that is, the rotor permanent magnet 206 and the first The magnetization direction of the part corresponding to the permanent magnet 112 is set as the N/S pole, and the magnetization direction of the part corresponding to the second permanent magnet 114 is the S/N pole, so that the armature windings of the two-stage side motor induce back EMF The phase difference is 180°, and finally its fundamental wave amplitude remains basically unchanged, but the harmonic content is greatly reduced, especially the even harmonics in the synthetic back EMF, thereby reducing the cogging torque and torque ripple of the motor.

Further, the stator assembly 100 further includes a magnetic spacer block disposed between the first permanent magnet 112 and the second permanent magnet 114 .

Specifically, by arranging a magnetic spacer block between the first permanent magnet 112 and the second permanent magnet 114, it is possible to effectively prevent the magnetic fields generated between the first permanent magnet 112 and the second permanent magnet 114 with opposite magnetization directions from interacting with each other. interference, to ensure that the first permanent magnet 112 and the second permanent magnet 114 can play their due roles respectively, and to ensure that the magnetic density harmonic component modulated between the stator assembly 100 and the rotor assembly 202 can be further increased, thereby generating more More working harmonics can further increase the output torque of the motor.

In any of the above embodiments, further, as shown in FIGS. 1 to 6 , there are multiple stator main teeth 102, and the plurality of stator main teeth 102 are distributed along the circumferential direction of the stator yoke 120; the permanent magnet 110 The quantity satisfies: Par=(a-1)×x; wherein, Par is the quantity of permanent magnets 110 , a is the quantity of secondary teeth 108 on each tooth shoe 106 , and x is the quantity of stator main teeth 102 .

In this embodiment, the number of stator main teeth 102 can be multiple, and the number of stator main teeth 102 can be set to multiple, and the plurality of stator main teeth 102 are distributed along the circumferential direction of the stator yoke 120, thereby ensuring that the stator The number of windings 118 wound on the stator main teeth 102 in the assembly 100 ensures that the magnetic field generated by the permanent magnet 110 can effectively cooperate with the windings 118 during the operation of the motor, thereby ensuring the operating efficiency of the motor.

On the basis of multiple stator main teeth 102, the number of permanent magnets 110 should satisfy: Par=(a-1)×x; wherein, Par is the number of permanent magnets 110, and a is the auxiliary teeth 108 on each tooth shoe 106 The number of x is the number of stator main teeth 102. That is, permanent magnets 110 are provided in the grooves 122 between any two adjacent secondary teeth 108, so as to ensure that the permanent magnets 110 can generate a magnetic field sufficient to match the rotor assembly 202 during the operation of the motor. Ensure that the permanent magnet 110 can generate sufficient working harmonics through the modulation of the salient poles 208 on the rotor assembly 202 to match the working harmonics modulated by the rotor permanent magnet 206 on the rotor assembly 202 through the stator main teeth 102, thereby generating more Working harmonics further increase the output torque of the motor.

Furthermore, the outer edges of the plurality of stator main teeth 102 are located on the same circle and are concentric with the stator yoke 120, forming a uniform air gap between the stator main teeth 102 and the rotor, matching the teeth on the tooth shoe 106. The groove 122 between two adjacent auxiliary teeth 108 realizes the uneven setting of the air gap between the stator assembly 100 and the rotor assembly 202, and then realizes the improvement of the waveform of the air gap magnetic field, so that the permanent magnets in the air gap The resulting magnetic field is more sinusoidal, which reduces the cogging torque and torque ripple of the motor.

In any of the above-mentioned embodiments, further, as shown in Fig. 4 and Fig. 5, there is a winding slot 128 between two adjacent tooth bodies 104, and a notch 130 is provided between two adjacent tooth shoes 106, and the slot The opening 130 communicates with the winding groove 128 ; in the circumferential direction of the stator assembly 100 , the size of the groove 122 is different from that of the notch 130 .

In this embodiment, there is a winding slot 128 between the tooth bodies 104 of two adjacent stator main teeth 102, so that when the winding 118 is wound on the tooth body 104 of the stator main tooth 102, it can be accommodated in the winding slot 128 In order to ensure the rationality of the position of the winding slot 128, the number of windings 118 and the operating efficiency of the motor are ensured.

Further, there is a notch 130 between two adjacent tooth shoes 106 , and the notch 130 communicates with the winding groove 128 . The setting of the notch 130 is beneficial to adjust the harmonic amplitude of the air gap magnetic field and the eddy current density of the rotor, so as to ensure the stability of the motor during operation and reduce the eddy current loss. Specifically, the harmonic amplitude of the air-gap magnetic field and the eddy current density of the rotor can be adjusted by setting the width of the notch 130 to meet different operating requirements of the motor.

In the circumferential direction of the stator assembly 100, the size of the groove 122 between two adjacent auxiliary teeth 108 and the size of the notch 130 between the tooth shoes 106 of two adjacent stator main teeth 102 can be set to be unequal . Specifically, in the circumferential direction of the stator assembly 100 , the width of the groove 122 may be set to be unequal to the width of the notch 130 .

Specifically, as shown in FIG. 6 , in the circumferential direction of the stator assembly 100 , the size of the groove 122 is larger than the size of the notch 130 . Specifically, in the circumferential direction of the stator assembly 100, the width of the groove 122 between two adjacent auxiliary teeth 108 is d1, and the width of the notch 130122 is d2, and d1>d2 is satisfied.

By setting the size of the groove 122 and the notch 130 to be different, the uniformity of the distribution of the auxiliary teeth 108 on all the stator main teeth 102 on the circumference can be changed, and the number of cycles of the air gap permeance is reduced. As the number of gap permeance cycles decreases, the flux density harmonic components generated by modulation will increase, so more working harmonics will be generated, which will further increase the output torque of the motor.

In any of the above embodiments, further, as shown in FIG. 4 and FIG. 5 , at least two auxiliary teeth 108 include first auxiliary teeth 124 and second auxiliary teeth 126; in the circumferential direction of the stator assembly 100, the first The auxiliary tooth 124 and the second auxiliary tooth 126 are located at opposite ends of the tooth shoe 106 .

In this embodiment, the at least two secondary teeth 108 include a first secondary tooth 124 and a second secondary tooth 126 . Wherein, in the circumferential direction of the stator assembly 100, the first auxiliary teeth 124 and the second auxiliary teeth 126 are located at opposite ends of the tooth shoe 106, and a notch is formed between the adjacent first auxiliary teeth 124 and the second auxiliary teeth 126. 130. In addition, the above-mentioned first auxiliary teeth 124 and second auxiliary teeth 126 can be used as magnetic field modulation components to improve the performance of the motor to which the stator assembly 100 is applied.

Specifically, a first auxiliary tooth 124 and a second auxiliary tooth 126 are respectively provided at opposite ends of the tooth shoe 106. direction. By disposing at least two auxiliary teeth 108 on the tooth shoe 106 , both the first auxiliary teeth 124 and the second auxiliary teeth 126 can be used as magnetic field modulation components to improve the performance of the motor to which the stator assembly 100 is applied.

Further, in the circumferential direction of the stator assembly 100 , the sizes of the first auxiliary teeth 124 and the second auxiliary teeth 126 are different.

Specifically, in the circumferential direction of the stator assembly 100 , the sizes of the first auxiliary teeth 124 and the second auxiliary teeth 126 are different. In this way, by limiting the structure of the first auxiliary teeth 124 and the second auxiliary teeth 126, the distribution of the air gap permeance between the stator assembly 100 and the rotor assembly 202 is effectively optimized, and the magnetic density harmonic components generated by modulation will increase, That is, more working harmonics will be generated, and the output torque of the motor will be further improved.

Specifically, a scheme in which the sizes of the first auxiliary teeth 124 and the second auxiliary teeth 126 are unequal may be adopted, for example, the size of the first auxiliary teeth 124 is set larger, and the size of the second auxiliary teeth 126 is set smaller. By limiting the structure of the first auxiliary tooth 124 and the second auxiliary tooth 126 to a design of unequal size, the distribution of the air gap permeance between the stator assembly 100 and the rotor assembly 202 can be effectively optimized, and the generated flux density harmonics can be modulated. The component will increase, that is, more working harmonics will be generated, and the output torque of the motor will be further increased, thereby improving the operating efficiency of the motor.

In any of the above-mentioned embodiments, further, as shown in FIG. 6 , in the radial direction of the stator assembly 100 , an angle β is formed between the centerlines of two adjacent secondary teeth 108 , and the angle β satisfies 1≤β /(2π/(b×x))<1.4, wherein, b represents the number of main stator teeth 102 , and x represents the number of auxiliary teeth 108 on each main stator tooth 102 .

In this embodiment, among two adjacent auxiliary teeth 108, an included angle β is formed between the tooth body 104 bisector L2 of one auxiliary tooth 108 and the tooth body 104 bisector L3 of the other auxiliary tooth 108, and satisfies 1≤β/(2π/(b×x))<1.4; wherein, b represents the number of stator main teeth 102 , and x represents the number of auxiliary teeth 108 on each stator main tooth 102 . In this way, the present application further optimizes the structure and distribution of the auxiliary teeth 108, so that the amplitude of the harmonic generated by applying the motor modulation is relatively large, and the torque is relatively high, so as to further improve the working efficiency of the motor.

Specifically, the auxiliary teeth 108 may only include the first auxiliary teeth 124 and the second auxiliary teeth 126 disposed at both ends of the tooth shoe 106, that is, the number of auxiliary teeth 108 is two, and the number of stator main teeth 102 is six , correspondingly, the angle β between the bisector L2 of the tooth body 104 of the first auxiliary tooth 124 and the bisector L3 of the tooth body 104 of the second auxiliary tooth 126 satisfies 1≤β/(2π/(6×2))< 1.4. In order to make the amplitude of the harmonics generated by the modulation of the motor applied with the stator assembly 100 larger and the torque higher, so as to further improve the working efficiency of the motor 200 .

In any of the above-mentioned embodiments, further, as shown in FIG. 6 , the distance from the bisector of the tooth body 104 of the stator main tooth 102 to the two side walls of the groove 122 is equal or different.

In this embodiment, there is a groove 122 between the first auxiliary tooth 124 and the second auxiliary tooth 126, and the application optimizes the distribution of the groove 122 on the tooth shoe 106, so that the tooth body of the stator main tooth 102 The distance from the bisector L1 of 104 to the two side walls of the groove 122 is equal or different. Such a design realizes the asymmetric arrangement of the tooth shoe 106 (the tooth shoe 106 is arranged asymmetrically with respect to the bisector L1 of the tooth body 104 ). In this way, through the above design, the distribution of air gap permeance can be changed, and some harmonics can be weakened, thereby reducing torque ripple and improving the vibration and noise performance of the motor.

Specifically, the distance from the bisector L1 of the tooth body 104 of the main stator tooth 102 to the two side walls of the groove 122 is equal. Thus, in the circumferential direction of the stator assembly 100 , the groove 122 is located in the middle of the tooth shoe 106 . Such a design can simplify the overall structure of the stator main teeth 102 and facilitate the manufacturing of the stator main teeth 102, thereby improving the processing efficiency of the stator assembly 100 and the entire motor. Specifically, in the circumferential direction of the stator assembly 100, the distances from the tooth body 104 bisector L1 of the stator main tooth 102 to the two side walls of the groove 122 are d3 and d4 respectively, and d3 is equal to d4.

Further, the distance from the bisector L1 of the tooth body 104 of the main stator tooth 102 to the two side walls of the groove 122 may also be different. In this way, in the circumferential direction of the stator assembly 100 , the groove 122 is offset toward one end of the tooth shoe 106 . Such setting can change the distribution of air gap permeance and weaken some harmonics, thereby reducing torque ripple and improving the vibration and noise performance of the motor. Moreover, when the magnetomotive force of the permanent magnet interacts with the air-gap permeance containing harmonics, new harmonic components will appear in the air-gap flux density. At this time, at least two auxiliary teeth 108 introduce more harmonic components into the air-gap permeance, so that the performance of the motor is significantly improved.

Specifically, in the stator assembly 100 proposed in the present application, grooves 122 are formed between two adjacent auxiliary teeth 108 , so that more harmonic components are introduced into the air gap permeance. When the magnetomotive force of the permanent magnet interacts with the air-gap permeance containing harmonics, new harmonic components will appear in the air-gap flux density. Then design the stator winding 118 according to the harmonic components, and the new harmonic components appearing in the air gap flux density can be used as the working harmonics of the motor 200 to provide output torque for the motor 200, thereby effectively improving the rotation speed of the motor 200. moment density.

Further, the stator assembly 100 includes at least two stacked bodies, and the stator assembly 100 is manufactured by stacking at least two stacked bodies. In this way, during the manufacturing process of the stator assembly 100 , workers can first perform operations such as winding wires on a single stack.

In particular, compared with the phase technology that needs to perform winding operations on the integral iron core, the stacked body proposed in this application has a larger operating space, which is conducive to reducing the difficulty of winding, thereby improving the working efficiency of winding and reducing material costs. .

In addition, the present application can first perform operations such as winding on a single stacked body, which can effectively increase the winding quantity of the coils of the winding 118, increase the slot fill rate of the winding 118, and improve the output performance of the applied motor. Moreover, on the basis of reducing the difficulty of winding, the present application can reduce the scrap rate during the winding process, thereby reducing scrap and improving the cost rate of the stator assembly 100 . In addition, the individual stacked body has lower requirements on materials, which can increase the utilization rate of iron core materials, thereby reducing the material cost of the stator assembly 100 .

Specifically, the yoke section of a stack may include one stator main tooth 102 , or may include two or more stator main teeth 102 . The yoke sections of two adjacent stacked bodies are detachably connected, thereby ensuring the disassembly and assembly of the two adjacent stacked bodies.

Further, the stator assembly 100 also includes a first connection part and a second connection part. Wherein, the first connection part is arranged at the first end of the yoke section, the first connection part is arranged at the second end of the yoke section, and the first end and the second section are oppositely arranged on the yoke section. Moreover, the structures of the first connecting part and the second connecting part match, and the cooperation between the first connecting part and the second connecting part can realize self-locking. Specifically, one of the first connecting portion and the second connecting portion is a convex portion, and the other is a concave portion. In addition, the shape of the convex part matches the shape of the concave part, and the convex part and the concave part can be detachably connected, and have a self-locking function.

Further, the stator assembly 100 also includes a fixing part (not shown in the figure). in. After the splicing of two adjacent stacked bodies is completed, the present application further fixes the overall structure through a fixing member, thereby further improving the structural stability of the spliced stacked bodies.

Specifically, the fixing member can use an insulating frame, so that the insulating frame can also fix the stacked body on the basis of ensuring insulation, thereby realizing the multi-purpose of the insulating frame.

In addition, two adjacent stacked bodies can also be connected by welding. in. After the splicing of two adjacent stacked bodies is completed, the present application further fixes the overall structure by means of welding, thereby further improving the structural stability of the spliced stacked bodies.

In addition, two adjacent stacked bodies can also be integrally injected. That is, after the splicing of two adjacent stacked bodies is completed, the present application further fixes the overall structure by integral injection molding, thereby further improving the structural stability of the spliced stacked bodies.

In any of the above embodiments, further, as shown in FIG. 4 and FIG. 5 , the tooth shoe 106 is detachably connected to the tooth body 104 ; and/or the tooth body 104 is detachably connected to the stator yoke 120 .

In this embodiment, the tooth body 104 of the stator main tooth 102 and the tooth shoe 106 can be set as a detachable connection, and at the same time, the tooth body 104 of the stator main tooth 102 can also be set as a detachable connection The detachable connection, that is, the tooth body 104 of the stator main tooth 102 and the stator yoke 120 and the tooth shoe 106 may be arranged as a detachable sheathing assembly structure. Through the setting of the detachable sleeve assembly structure between the tooth body 104, the tooth shoe 106 and the stator yoke 120, during the assembly process of the stator assembly 100, the winding can be wound on the tooth body 104 of the stator main tooth 102 first. 118 , then connect one end of the tooth body 104 with the stator yoke 120 , and finally install the tooth shoe 106 to the other end of the tooth body 104 . Thus, the simplified winding process in the assembly process of the stator assembly 100 is realized, the difficulty of winding is reduced, the slot filling ratio of the winding 118 is improved, the output performance of the motor is improved, and waste materials and waste of materials can be reduced at the same time.

Specifically, the tooth body 104 of the stator main tooth 102 and the stator yoke 120 can be connected through a concave-convex structure, that is, a groove 122 or a protrusion is provided at one end of the stator main tooth 102 tooth body 104, and correspondingly, in The corresponding position of the stator yoke 120 is set on the groove 122 or the protrusion or the groove 122 that matches the protrusion, so that the stator main tooth 102 and the tooth body 104 of the stator yoke 120 can be realized through the cooperation of the groove 122 and the protrusion. the connection between.

Correspondingly, the tooth body 104 and the tooth shoe 106 can also be connected through a concave-convex structure, that is, the connection between the tooth shoe 106 and the tooth body 104 is carried out through mutually matching protrusions and grooves 122, so as to realize the winding process simplification.

In any of the above embodiments, further, as shown in FIGS. 1 to 5 , in the radial direction of the stator assembly 100 , the height of the permanent magnet 110 is smaller than the height of the groove 122 .

In this embodiment, from the radial direction of the stator assembly 100, the relationship between the height of the permanent magnet 110 and the height of the groove 122 is defined, specifically, in the radial direction of the stator assembly 100, the permanent magnet 110 The height can be set to be less than the height of the groove 122, so as to prevent the permanent magnet 110 protruding from the outside of the groove 122 and affect the rotation of the rotor, which is conducive to the rational design of the motor structure and ensures the stability of the motor during operation.

Further, the shape of the permanent magnet 110 is a polygon or an arc.

Correspondingly, the cross-sectional area of the groove 122 for placing the permanent magnet 110 may be a polygon or an arc suitable for the shape of the permanent magnet 110 .

Specifically, the shape of the permanent magnet 110 may be square or triangular. According to the second aspect of the present application, as shown in FIG. 7 , FIG. 8 and FIG. 9 , a motor is proposed, including: a rotor assembly 202 ; and a stator assembly 100 according to any one of the above technical solutions.

In the motor provided by the present application, the stator assembly 100 can be arranged so that at least a part thereof is located in the rotor assembly 202, that is, the inner stator structure. Specifically, the stator assembly 100 is arranged concentrically with the rotor assembly to ensure that the rotor assembly 202 can rotate relative to the stator assembly 100. , to realize the power output of the motor. Wherein, a part of the stator assembly 100 is located in the rotor assembly 202, and the stator assembly 100 can also be integrally arranged in the rotor assembly 202 in the axial direction, so as to realize the connection between the rotor permanent magnet 206 of the rotor assembly and the winding 118 of the stator assembly 100. Different fits.

Specifically, the structure of the motor 200 may also be configured as an outer stator structure.

Furthermore, the motor provided by the present application includes the stator assembly 100 according to the first aspect of the present application. Therefore, all the beneficial effects of the above-mentioned stator assembly 100 are available, and will not be discussed in detail here.

In any of the above embodiments, further, as shown in FIG. 10 , FIG. 11 and FIG. 12 , the rotor assembly 202 includes: a rotor core, the rotor core includes a rotor yoke 204 and a plurality of salient poles 208 , and a plurality of salient poles 208 The poles 208 are disposed on the rotor yoke 204 , and installation grooves are formed between adjacent salient poles 208 ; the rotor permanent magnets 206 are disposed in the installation grooves.

In this embodiment, rotor assembly 202 includes a rotor core 210 and a plurality of rotor permanent magnets 206 . Wherein, the rotor core 210 includes a rotor yoke 204 and a plurality of salient poles 208, the plurality of salient poles 208 protrude from the inner peripheral wall of the rotor yoke 204, and the plurality of salient poles 208 are spaced apart in the circumferential direction of the rotor yoke 204 distributed. The plurality of rotor permanent magnets 206 are respectively disposed between two adjacent salient poles 208 , and the magnetization directions of the plurality of rotor permanent magnets 206 are the same. In this way, in the circumferential direction of the rotor yoke 204 , a plurality of salient poles 208 and a plurality of rotor permanent magnets 206 are alternately distributed.

Further, a plurality of rotor permanent magnets 206 with the same magnetization direction are respectively arranged between two adjacent salient poles 208, and a magnetic structure of alternating poles is formed on the rotor yoke 204 of the rotor core 210, so that the rotor core 210 It is a salient pole 208 structure. In this way, the number of rotor permanent magnets 206 used is reduced, and the manufacturing difficulty of the alternating pole rotor is reduced, and the magnetic field modulation effect is enhanced, and the amplitude of the working sub-harmonic is increased, so that the motor produces better output performance . Moreover, in the present application, a plurality of salient poles 208 and a plurality of rotor permanent magnets 206 are arranged alternately on the rotor yoke 204 of the rotor core 210, which also avoids the reduction in the number of magnetic poles after the use of alternating poles in the related art, and the fundamental wave of the magnetic field The amplitude drops, causing the problem of torque drop. Moreover, during the operation of the motor 200, the permanent magnets 110 in the stator assembly 100 can be modulated by the salient poles 208 on the rotor assembly 202 to generate working harmonics, and at the same time, the rotor permanent magnets 206 on the rotor assembly 202 can also pass through the stator The main teeth 102 modulate the working harmonics, so that the flux density harmonic components modulated between the stator assembly 100 and the rotor assembly 202 further increase, thereby generating more working harmonics, and further increasing the output torque of the motor 200 .

Specifically, in the axial direction of the rotor core 210, the rotor core 210 may include two parts, that is, the first rotor core 210 and the second rotor core 210, the first rotor core 210 and the second rotor core The structure of the core 210 is the same. Further, rotor permanent magnets 206 are arranged between the adjacent salient poles 208 of the first rotor core 210 and the second rotor core 210, and the centerline of the salient poles 208 of the first rotor core 210 and the second The centerlines of the rotor permanent magnets 206 in the rotor core 210 are aligned. Correspondingly, the centerlines of the rotor permanent magnets 206 in the first rotor core 210 are aligned with the centerlines of the salient poles 208 of the second rotor core 210 . Further, the rotor permanent magnet 206 in the first rotor core 210 is opposite to the first permanent magnet 112 in the stator assembly 100, and the magnetization direction is the same, and the rotor permanent magnet 206 in the second rotor core 210 is in the same position as the stator The positions of the second permanent magnets 114 in the assembly 100 are opposite, and the magnetization directions are the same.

Through the above design, the axial segment setting of the motor 200 is realized, so that the phase difference of the induced back EMF of the armature winding 118 of the two segments of the motor is 180°, and finally the amplitude of the fundamental wave basically remains unchanged, but the harmonic content is greatly reduced , especially the even harmonics in the synthetic back EMF, thereby reducing the cogging torque and torque ripple of the motor 200.

Specifically, as shown in FIG. 10 , the rotor permanent magnets 206 may be arranged in a Halbach Array.

In any of the above-mentioned embodiments, further, the number of pole pairs of the stator assembly 100 is Pa, the number of pole pairs of the rotor permanent magnet 206 is P1, the number of stator main teeth 102 is x, and the pair on each stator main tooth 102 is The number of teeth 108 is a, and the number of pole pairs of the rotor assembly 202 is Pr, where Pa=|a×x±Pr| or Pa=|Pr±P1|.

In this embodiment, by setting the number of pole pairs of the stator assembly 100 and the number of pole pairs of the permanent magnet 110 to meet the preset relationship, the new harmonic components appearing in the air gap flux density can be used as the working harmonics of the motor 200, The output torque is provided for the motor, thereby effectively improving the torque density of the motor 200 .

Specifically, the number of pole pairs of the stator assembly 100 is Pa, the number of pole pairs of the permanent magnets 110 is P1, the number of stator main teeth 102 is x, the number of auxiliary teeth 108 on each stator main tooth 102 is a, and the rotor assembly The number of pole pairs is Pr, where Pa=|a×x±Pr| or Pa=|Pr±P1|.

Specifically, the stator assembly can adopt six teeth and two splits, that is, x=6, a=2, the number of pole pairs of the stator permanent magnet 110 is 6, and the number of pole pairs of the rotor assembly 202 is 10, then according to the modulation relationship on the side of the stator assembly 100 and the rotor The limiting formula calculation of the modulation relationship on the component 202 side, Pa=∣2×6±10|=2 or 22, specifically can be 2, or Pa=|10±6|=4 or 16, specifically can be 4. Therefore, according to the calculation, the optimal number of pole pairs of the stator assembly 100 is 2 or 4.

According to a third aspect of the present application, an electrical device is provided, including the motor 200 in any one of the above embodiments.

Specifically, the electrical equipment may include an air conditioner, a washing machine, a vacuum cleaner, and the like.

The electrical equipment provided by the present application includes the motor of any one of the above technical solutions, so it has all the beneficial effects of the motor, and will not be repeated here.

In the description of this application, the term "plurality" refers to two or more than two. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper", "lower" and so on is based on the orientation shown in the accompanying drawings. Orientation or positional relationship is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the application; The terms "connection", "installation" and "fixation" should be understood in a broad sense, for example, "connection" can be fixed connection, detachable connection, or integral connection; it can be directly connected or through an intermediate The medium is indirectly connected. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

In the description of this specification, descriptions of the terms "one embodiment", "some embodiments", "specific embodiments" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in this application In at least one embodiment or example of . In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (17)

1. A stator assembly, comprising:

   stator yoke;

   Stator main teeth, the stator main teeth include a tooth body and a tooth shoe, one end of the tooth body is connected to the stator yoke, and the tooth shoe is connected to the other end of the tooth body;

   The end of the tooth shoe away from the tooth body is provided with at least two auxiliary teeth, and there is a groove between two adjacent auxiliary teeth;

   The permanent magnet is arranged in the groove.
2. The stator assembly of claim 1, wherein said permanent magnets comprise:

   The first permanent magnet is arranged in the groove;

   A second permanent magnet, arranged in the groove, along the axial direction of the stator assembly, the second permanent magnet is located on the side of the first permanent magnet;

   The magnetization direction of the first permanent magnet is opposite to that of the second permanent magnet.
3. The stator assembly of claim 2, further comprising:

   The magnetic spacer block is arranged between the first permanent magnet and the second permanent magnet.
4. The stator assembly of claim 1, wherein:

   The number of the stator main teeth is multiple, and the plurality of stator main teeth are distributed along the circumferential direction of the stator yoke;

   The quantity of the permanent magnet satisfies: Par=(a-1)×x;

   Wherein, Par is the number of permanent magnets, a is the number of auxiliary teeth on each tooth shoe, and x is the number of main teeth of the stator.
5. The stator assembly of claim 1, wherein:

   There is a winding groove between two adjacent tooth bodies, and a notch is formed between two adjacent tooth shoes, and the notch communicates with the winding groove;

   In the circumferential direction of the stator assembly, the size of the groove is different from the size of the notch.
6. The stator assembly of claim 5, wherein:

   The at least two secondary teeth include a first secondary tooth and a second secondary tooth;

   In the circumferential direction of the stator assembly, the first auxiliary teeth and the second auxiliary teeth are located at opposite ends of the tooth shoe.
7. The stator assembly of claim 6, wherein:

   In the circumferential direction of the stator assembly, the sizes of the first auxiliary teeth and the second auxiliary teeth are different.
8. The stator assembly of claim 6, wherein:

   In the radial direction of the stator assembly, an included angle β is formed between the centerlines of two adjacent auxiliary teeth, and satisfies 1≤β/(2π/(b×x))<1.4, wherein, b represents the number of main teeth of the stator, and x represents the number of auxiliary teeth on each main tooth of the stator.
9. The stator assembly of claim 6, wherein:

   The distance from the tooth body bisector of the main teeth of the stator to the two side walls of the groove is equal or different.
10. A stator assembly according to any one of claims 1 to 9, wherein,

    The tooth shoe is detachably connected to the tooth body; and/or

    The tooth body is detachably connected to the stator yoke.
11. A stator assembly according to any one of claims 1 to 9, wherein,

    In the radial direction of the stator assembly, the height of the permanent magnet is smaller than the height of the groove.
12. A stator assembly according to any one of claims 1 to 9, wherein,

    The shape of the permanent magnet is polygonal or arc.
13. The stator assembly according to any one of claims 1 to 9, further comprising:

    The winding is arranged on the main teeth of the stator.
14. A motor, including:

    rotor assembly;

    A stator assembly as claimed in any one of claims 1 to 13.
15. The electric machine of claim 14, wherein said rotor assembly comprises:

    A rotor core, the rotor core includes a rotor yoke and a plurality of salient poles, the plurality of salient poles are arranged on the rotor yoke, and installation grooves are formed between adjacent salient poles;

    The rotor permanent magnet is arranged in the installation groove.
16. The electric machine according to claim 14, wherein,

    The number of pole pairs of the stator assembly is Pa, the number of pole pairs of the permanent magnet is P1, the number of the stator main teeth is x, the number of auxiliary teeth on each of the stator main teeth is a, the The number of pole pairs of the rotor assembly is Pr,

    Wherein, Pa=|a×x±Pr| or Pa=|Pr±P1|.
17. An electrical device, comprising:

    An electric machine as claimed in any one of claims 14 to 16.

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