Electric machines and electric appliances

Abstract

The application provides an electric machine and an electric appliance, wherein the electric machine comprises a rotor and a stator, the stator comprises a stator core, the stator core comprises a plurality of stator core punching sheets, the stator core punching sheet comprises a stator yoke part, a plurality of first stator teeth connected to the outer circumferential side of the stator yoke part in the circumferential direction, a plurality of second stator teeth connected to the outer circumferential side of the stator yoke part in the circumferential direction, the plurality of first stator teeth and the plurality of second stator teeth are arranged at intervals, the width of the first stator tooth is smaller than the width of the second stator tooth, and the stator further comprises a plurality of windings, any winding is wound on a corresponding second stator tooth; the first stator tooth comprises a first tooth body connected to the stator yoke part, and the width of the first tooth body gradually increases in the direction away from the stator yoke part. In this way, the installation space of the winding can be increased, the winding difficulty of the winding can be reduced, the assembly efficiency of the product can be improved, the slot fill factor of the electric machine is improved, and the assembly precision of the winding is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electric machines, and in particular, relates to an electric machine and an electric appliance. BACKGROUND

[0002] In the prior art, small electric machines have small sizes, which leads to small sizes of stators in the electric machines, small spaces for winding windings in the stators, and thus increased difficulty in winding processes and low slot fill rates of the electric machines. SUMMARY

[0003] The present application aims to at least solve one of the problems in the prior art or related art.

[0004] To this end, a first object of the present application is to provide an electric machine.

[0005] A second object of the present application is to provide an electric appliance.

[0006] To achieve the above at least one object, according to a first aspect of the present application, an electric machine is provided, comprising: a rotor comprising a stator slot; a stator located in the stator slot, the stator comprising a stator core, the stator core comprising a plurality of stator core laminations stacked, any stator core lamination comprising: a stator yoke portion; a plurality of first stator teeth connected to an outer circumferential side of the stator yoke portion in a circumferential direction; a plurality of second stator teeth connected to the outer circumferential side of the stator yoke portion in the circumferential direction, the plurality of first stator teeth and the plurality of second stator teeth being spaced apart, the width of the first stator teeth being smaller than the width of the second stator teeth; the stator further comprising a plurality of windings, any winding being wound around a corresponding second stator tooth; any first stator tooth comprising: a first tooth body connected to the stator yoke portion, the width of the first tooth body gradually increasing in a direction away from the stator yoke portion.

[0007] The electric machine provided in the present application comprises a stator and a rotor, wherein the rotor comprises a stator slot, the stator is located in the stator slot, the rotor and the stator are coaxially arranged, and the rotor can rotate relative to the stator. The stator comprises a stator core, the stator core comprises a plurality of stator core laminations, and the plurality of stator core laminations are stacked to form the stator core. The structure of the stator core lamination is defined as follows: the stator core lamination comprises a stator yoke portion, a plurality of first stator teeth, and a plurality of second stator teeth, wherein the plurality of first stator teeth and the plurality of second stator teeth are connected to the stator yoke portion, specifically, the plurality of first stator teeth are connected to an outer circumferential side of the stator yoke portion in a circumferential direction, the plurality of second stator teeth are connected to the outer circumferential side of the stator yoke portion in the circumferential direction, the plurality of first stator teeth and the plurality of second stator teeth are spaced apart, and any adjacent first stator tooth and second stator tooth together enclose the stator slot.

[0008] Further, the stator core punching sheet is used in a stator further comprising a plurality of windings. In a conventional stator, the number of windings is the same as the number of stator teeth, and the windings are arranged one-to-one with the stator teeth, and the windings are wound on the corresponding stator teeth to fix the windings. However, with the miniaturization of the motor, the size of the stator is also reduced, and the space between adjacent two stator teeth is also reduced, which leads to the reduction of the installation space of the winding and the increase of the winding difficulty. In order to solve the winding difficulty problem in the small motor, the winding is wound on the second stator tooth, and the winding is not wound on the first stator tooth, so that the installation space of the winding can be increased, the winding difficulty is reduced, the number of windings is halved, the production efficiency of the product is improved, and the assembly precision of the winding is improved, and the performance of the product is improved. Further, since each winding is wound on the second stator tooth, and the first stator tooth is spaced apart from the second stator tooth, i.e. a first stator tooth is provided between any two adjacent windings, the windings are separated by the first stator tooth, in this case, even if one winding has a problem, it will not affect the adjacent winding, and the reliability of the product is improved.

[0009] Further, in order to further improve the installation space of the winding, the size of the first stator tooth and the second stator tooth is limited. Specifically, the width of the first stator tooth is less than the width of the second stator tooth. Understandably, since the winding is wound on the second stator tooth, and the first stator tooth does not wind the winding, i.e. the second stator tooth and the adjacent first stator tooth define a stator slot for accommodating the winding, the smaller the width of the first stator tooth, the larger the space of the stator slot, the larger the installation space of the winding, and the smaller the winding difficulty. Therefore, in order to further reduce the winding difficulty, the width of the first stator tooth is set to be less than the width of the second stator tooth, so that the size of the stator slot can be increased, thereby increasing the installation space of the winding, thereby further reducing the winding difficulty. And since the first stator tooth does not wind the winding, the stress on the first stator tooth is less than that on the second stator tooth, even if the width of the first stator tooth is less than that of the second stator tooth, there is no risk of the first stator tooth breaking due to insufficient strength.

[0010] Further, when designing the width of the first stator tooth and the width of the second stator tooth, the relationship between the pole arc angle occupied by the first stator tooth and the pole arc angle occupied by the second stator tooth needs to be considered. Specifically, the number of the first stator tooth and the number of the second stator tooth are the same, both are Z, any first stator tooth and the adjacent second stator tooth form a stator tooth part, the tooth arc angle occupied by each stator tooth part is As, and the tooth arc angle occupied by each stator tooth part is composed of the pole arc angle occupied by the first stator tooth contained therein and the pole arc angle occupied by the second stator tooth contained therein. Wherein, the pole arc angle occupied by the second stator tooth is 2xAl, the pole arc angle occupied by the first stator tooth is 2x A2, and As = 360° / Z = 2(A1+A2). The distribution of the pole arc angle occupied by the first stator tooth and the pole arc angle occupied by the second stator tooth is closely related to the torque output capability of the motor, and the size of the pole arc angle occupied by the first stator tooth and the pole arc angle occupied by the second stator tooth is related to the width of the first stator tooth and the width of the second stator tooth. Therefore, a suitable distribution relationship of A1 and A2 can be selected to improve the torque density of the motor, and then the width of the first stator tooth and the width of the second stator tooth can be designed according to A1 and A2.

[0011] Further, the structure of the first stator tooth is limited, any first stator tooth includes a first tooth body, the first tooth body is connected with the stator yoke part, and the width of the first tooth body gradually increases in the direction away from the stator yoke part. The first tooth body is configured as a structure similar to a trapezoid, and the two sides of the first stator tooth can be provided with protruding structures or not. Along the radial direction of the stator core punching sheet, the width of the first stator tooth changes, specifically, the width of the first tooth body gradually increases in the direction away from the stator yoke part. Understandably, if the width of the first tooth body at each position along the radial direction of the stator core punching sheet is the same, the width of the stator slot in the area closer to the center of the stator core punching sheet is smaller, which will cause the winding difficulty to increase. In order to further increase the distance between the first stator tooth and the second stator tooth and increase the space of the stator slot, the first tooth body is configured to gradually increase in width in the direction away from the stator yoke part, that is, the width of the first tooth body in the area closer to the center of the stator core punching sheet is smaller, so that the space of the stator slot in the area closer to the center of the stator core punching sheet can be increased, thereby reducing the winding difficulty, improving the assembly efficiency of the product, and also improving the assembly precision of the winding, so that the performance of the product is improved.

[0012] And, by configuring the first tooth body as a structure of narrow at one end and wide at the other end, the winding position in the stator slot can be improved, so that the winding arrangement of the winding is more uniform from the radial inside to the radial outside. By setting the first stator tooth and the second stator tooth with different widths in the stator core punching sheet, and winding the winding in the motor on the second stator tooth with a wider width, the size of the stator slot between the first stator tooth and the second stator tooth can be increased by setting the first stator tooth with a smaller width, the installation space of the winding is increased, and the winding difficulty is reduced, the assembly efficiency of the product is improved, the slot fill rate of the motor is improved, and the assembly precision of the winding is improved, so that the performance of the product is improved. And, since the winding is wound on the second stator tooth, the first stator tooth can separate the two adjacent windings, so that even if one winding fails, it will not affect the adjacent windings, improving the reliability of the product. By configuring the first tooth body of the first stator tooth as a structure with gradually increasing width in the direction away from the stator yoke, the space of the stator slot can be increased, and the installation space of the winding is increased, the winding difficulty is reduced, the assembly efficiency of the product is improved, and the winding arrangement of the winding is more uniform from the radial inside to the radial outside, the assembly precision of the winding is improved, and the performance of the product is improved.

[0013] According to the motor of the present application, the following technical features can also be provided:

[0014] In the above technical solution, further, any first stator tooth further comprises: a first tooth crown connected to one end of the first tooth body away from the stator yoke, and the first tooth crown protrudes from both sides of the first tooth body.

[0015] In this technical solution, another structure of the first stator tooth is limited. The first stator tooth can be configured to include only the first tooth body, and the first stator tooth can also be configured to include the first tooth body and the first tooth crown connected to the first tooth body. In the case where the first stator tooth includes the first tooth crown, the first tooth crown is connected to one end of the first tooth body away from the stator yoke. Specifically, the width of the first tooth crown is greater than that of the first tooth body, and the first tooth crown protrudes from both sides of the first tooth body. Understandably, the first stator tooth and the adjacent second stator tooth form a stator slot, and since the first tooth crown is connected to one end of the first tooth body away from the stator yoke, the first tooth crown is located at the slot opening of the stator slot. The stator slot is used to accommodate the winding, and since the first tooth crown protrudes from both sides of the first tooth body, the first tooth crown can be used to limit the winding to prevent the winding from coming out of the stator slot, improving the safety and reliability of the product.

[0016] By providing the first tooth crown protruding from the first tooth body in the first stator tooth, the winding in the stator slot can be limited by the first tooth crown to prevent the winding from coming out of the stator slot, improving the safety and reliability of the product.

[0017] In the technical solution, further, any second stator tooth comprises: a second tooth body connected with the stator yoke; and a second tooth crown connected with one end of the second tooth body away from the stator yoke, the second tooth crown protruding from both sides of the second tooth body, and at least one adjusting groove being arranged at the edge of the second tooth crown away from the second tooth body.

[0018] In the technical solution, the structure of the second stator tooth is limited. Any second stator tooth comprises a second tooth body and a second tooth crown, wherein the second tooth body is connected with the stator yoke, the second tooth body extends in the direction away from the stator yoke in the radial direction, and the second tooth crown is connected with one end of the second tooth body away from the stator yoke. Specifically, the winding is wound on the second tooth body, and if no structure protruding from the second tooth body is arranged in the second stator tooth, the winding is prone to fall off from the second tooth body. In order to avoid the above problem, the second tooth crown is arranged in the second stator tooth in the present application. Since the second tooth crown is connected with one end of the second tooth body away from the stator yoke and protrudes from both sides of the second tooth body, the winding can be limited by the second tooth crown, so as to avoid the winding from falling off from the second tooth body, thereby improving the safety and reliability of the product.

[0019] Further, the edge of the second tooth crown away from the second tooth body is provided with at least one adjusting groove, wherein the adjusting groove is recessed in the edge of the second tooth crown. The number of the second adjusting groove can be one or multiple. In the case that the number of the second adjusting groove is multiple, the multiple second adjusting grooves are arranged in sequence along the edge of the second tooth crown away from the stator yoke. The second adjusting groove is used to adjust the torque ripple of the motor. By arranging the second adjusting groove, the torque ripple of the motor can be reduced, thereby improving the stability of the motor operation.

[0020] In the technical solution, further, in the case that the adjusting groove in any second tooth crown is one, the center line of the adjusting groove coincides with the center line of the second tooth crown.

[0021] In the technical solution, the position of the adjusting groove is limited. Specifically, in the case that the adjusting groove in any second tooth crown is one, the center line of the adjusting groove coincides with the center line of the second tooth crown. Compared with arranging the adjusting groove in the structure close to both sides of the second tooth crown, by arranging the adjusting groove at the central position of the second tooth crown, the center line of the adjusting groove coincides with the center line of the second tooth crown, which can further improve the adjusting effect of the adjusting groove on the torque ripple of the motor, so as to further reduce the torque ripple of the motor and improve the stability of the motor operation.

[0022] In one possible technical solution, a slot opening of the stator slot is formed between the first tooth crown arranged on the first stator tooth and the second tooth crown arranged on the second stator tooth, the slot opening width of the stator slot is composed of the slot opening width occupied by the first stator tooth and the slot opening width occupied by the second stator tooth, wherein the slot opening width of the stator slot is Ds, the slot opening width occupied by the second stator tooth is D1, the slot opening width occupied by the first stator tooth is D2, and Ds=D1+D2.

[0023] In the above technical solution, further, the width of the second tooth body gradually increases in the direction away from the stator yoke.

[0024] In the technical solution, the structure of the second tooth body is limited. The second tooth body is configured as a structure similar to a trapezoid, and the width of the second tooth body changes along the radial direction of the stator core punching sheet. Specifically, the width of the second tooth body gradually increases in the direction away from the stator yoke. Understandably, if the width of the second tooth body at each position along the radial direction of the stator core punching sheet is the same, the width of the stator slot in the area closer to the center of the stator core punching sheet is smaller, which will cause the winding difficulty to increase. In order to further increase the distance between the first stator tooth and the second stator tooth and increase the space of the stator slot, the second tooth body is configured to gradually increase in width in the direction away from the stator yoke, that is, the width of the second tooth body in the area closer to the center of the stator core punching sheet is smaller. In this way, the space of the stator slot in the area of the center of the stator core punching sheet can be increased, thereby reducing the winding difficulty of the winding, improving the assembly efficiency of the product, and also improving the assembly accuracy of the winding, so that the performance of the product is improved.

[0025] By configuring the second tooth body as a structure gradually increasing in width in the direction away from the stator yoke, the space of the stator slot can be increased, thereby increasing the installation space of the winding, reducing the winding difficulty, improving the assembly efficiency of the product, and also improving the assembly accuracy of the winding, so that the performance of the product is improved.

[0026] In the above technical solution, further, the rotor rotates from the first end of the second tooth crown to the second end of the second tooth crown, and any second tooth crown comprises: a first sub-tooth crown located at the first end of the second tooth crown, the first sub-tooth crown having a first arc-shaped outer edge; and a second sub-tooth crown located at the second end of the second tooth crown, the second sub-tooth crown having a second arc-shaped outer edge, and the curvature radius of the first arc-shaped outer edge is smaller than the curvature radius of the second arc-shaped outer edge.

[0027] In the technical solution, the structure of the second tooth crown is further limited. The motor in which the stator core punching sheet is used further comprises a rotor, the rotor of the motor is coaxially arranged with the stator core punching sheet and can rotate relative to the stator core punching sheet, and specifically, the rotor rotates from the first end of the second tooth crown to the second end of the second tooth crown. Any second tooth crown comprises a first sub-tooth crown and a second sub-tooth crown, and the first sub-tooth crown and the second sub-tooth crown are respectively located at two ends of the second tooth crown, wherein the first sub-tooth crown is located at the first end of the second tooth crown, and the second sub-tooth crown is located at the second end of the second tooth crown. The side of the first sub-tooth crown and the second sub-tooth crown away from the stator yoke is arc-shaped, the first sub-tooth crown has a first arc-shaped outer edge, and the second sub-tooth crown has a second arc-shaped outer edge, the first arc-shaped outer edge and the second arc-shaped outer edge are located on the side of the second tooth crown away from the stator yoke, the first arc-shaped outer edge extends from the slot opening of the adjusting slot to the end of the first sub-tooth crown, and the second arc-shaped outer edge extends from the slot opening of the adjusting slot to the end of the second sub-tooth crown. In order to further reduce the torque ripple of the motor, the curvature radius of the first arc-shaped outer edge and the second arc-shaped outer edge is limited, and specifically, the curvature radius of the first arc-shaped outer edge is smaller than the curvature radius of the second arc-shaped outer edge, so as to reduce the torque ripple of the motor and further improve the stability of the motor.

[0028] In the above technical solution, further, any first tooth crown comprises: a third sub-tooth crown located at the first end of the first tooth crown, the third sub-tooth crown having a third arc-shaped outer edge; and a fourth sub-tooth crown located at the second end of the first tooth crown, the fourth sub-tooth crown having a fourth arc-shaped outer edge, the curvature radius of the third arc-shaped outer edge and / or the curvature radius of the fourth arc-shaped outer edge being smaller than the curvature radius of the arc-shaped outer edge of the stator core assembly.

[0029] In the technical solution, the structure of the first tooth crown is further limited. Any first tooth crown comprises a third sub-tooth crown and a fourth sub-tooth crown, and the third sub-tooth crown and the fourth sub-tooth crown are respectively located at two ends of the first tooth crown. The third sub-tooth crown has a third arc-shaped outer edge, and the fourth sub-tooth crown has a fourth arc-shaped outer edge, and the third arc-shaped outer edge and the fourth arc-shaped outer edge are located on the side of the first tooth crown away from the stator yoke. In order to further reduce the torque ripple of the motor, the curvature radius of the third arc-shaped outer edge and the fourth arc-shaped outer edge is limited, and specifically, the curvature radius of the third arc-shaped outer edge and / or the curvature radius of the fourth arc-shaped outer edge is smaller than the curvature radius of the arc-shaped outer edge of the stator core assembly, so as to reduce the torque ripple of the motor and further improve the stability of the motor.

[0030] In the above technical solution, further, the rotor comprises: a rotor yoke; a plurality of rotor magnets, the plurality of rotor magnets being sequentially connected with the rotor yoke in a circumferential direction, any two adjacent rotor magnets having a spacing therebetween, and the rotor magnets being arranged on the side of the rotor yoke facing the stator.

[0031] In the technical solution, the structure of the rotor is limited. The rotor comprises a rotor yoke and a plurality of rotor magnets, and the plurality of rotor magnets are sequentially connected to the rotor yoke in the circumferential direction. Specifically, the plurality of rotor magnets are uniformly distributed on the inner side of the rotor yoke in the circumferential direction of the rotor.

[0032] In a possible technical solution, the rotor magnet is configured as a multi-pole magnetic ring, the multi-pole magnetic ring is composed of a permanent magnet material to form a ring structure, and is assembled with the rotor yoke to form a nested structure. The integrated magnetic ring is beneficial to simplify the assembly process and improve the manufacturing efficiency. Specifically, the multi-pole magnetic ring adopts a rubber magnetic strip, and is assembled with the rotor yoke by bending and coiling.

[0033] Further, the two adjacent rotor magnets have a spacing therebetween, and the plurality of rotor magnets can realize torque ripple optimization by setting a reasonable spacing therebetween.

[0034] In a possible technical solution, the plurality of rotor magnets are integrally plasticized and fixed with the rotor yoke, so as to weaken the deterioration of the motor performance caused by the cumulative process error.

[0035] In the above technical solution, further, the two ends of any rotor magnet have a first arc-shaped inner side, and the curvature radius of the first arc-shaped inner side is greater than the curvature radius of the arc-shaped inner side of the rotor.

[0036] In the technical solution, the structure of the rotor magnet is further limited. The two ends of any rotor magnet have a first arc-shaped inner side, and the first arc-shaped inner side is arranged on the side facing the stator. In order to further reduce the torque ripple of the motor, the curvature radius of the first arc-shaped inner side is limited in the application, specifically, the curvature radius of the first arc-shaped inner side is greater than the curvature radius of the arc-shaped inner side of the rotor, so as to be beneficial to reduce the torque ripple of the motor and further improve the stability of the motor operation.

[0037] In a possible technical solution, the first arc-shaped inner side is configured as a chamfered arc structure, which can be a circular arc or a right-angle cutting edge, and can be symmetrical or asymmetrical.

[0038] The fifth aspect of the application further provides an electrical appliance comprising the motor provided in the first aspect of the application.

[0039] The electrical appliance provided in the second aspect of the application has all the beneficial effects of the motor.

[0040] Additional aspects and advantages of the application will become apparent in the light of the following description, or will be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0041] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings in which:

[0042] Figure 1 Fig. 1 shows a structural schematic diagram of a stator core punching sheet of one embodiment of the present application;

[0043] Figure 2 Fig. 2 shows a structural schematic diagram of a stator core punching sheet of one embodiment of the present application;

[0044] Figure 3 Fig. 3 shows a structural schematic diagram of a motor of one embodiment of the present application;

[0045] Figure 4 Fig. 4 shows a structural schematic diagram of a motor of one embodiment of the present application.

[0046] Wherein, Figures 1 to 4 The correspondence between the reference signs and the component names in the accompanying drawings is as follows:

[0047] 100 stator core punching sheet, 110 stator yoke, 120 first stator tooth, 121 first tooth body, 122 first tooth crown, 123 third sub-tooth crown, 124 fourth sub-tooth crown, 125 third arc-shaped outer edge, 126 fourth arc-shaped outer edge, 130 second stator tooth, 131 second tooth body, 132 second tooth crown, 133 adjusting slot, 134 first sub-tooth crown, 135 second sub-tooth crown, 136 first arc-shaped outer edge, 137 second arc-shaped outer edge, 200 motor, 210 stator, 211 winding, 220 rotor, 221 stator slot, 222 rotor yoke, 223 rotor magnet, 224 first arc-shaped inner edge. DETAILED DESCRIPTION

[0048] In order to more clearly understand the above-mentioned purposes, 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 the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0049] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0050] The following description refers to the accompanying drawings that show embodiments of the present application. Figures 1 to 4 A motor 200 and an electrical appliance device are described according to some embodiments of the present application.

[0051] In one embodiment according to the present application, as Figure 1 , Figure 2 and Figure 3As shown, in the first aspect of the present application, an electric machine 200 is provided, comprising: a rotor 220 comprising a stator slot 221; a stator 210 located in the stator slot 221, the stator 210 comprising a stator core, the stator core comprising a plurality of stator core punching sheets 100 stacked together, any stator core punching sheet 100 comprising: a stator yoke portion 110; a plurality of first stator teeth 120 connected to an outer circumferential side of the stator yoke portion 110 in a circumferential direction; a plurality of second stator teeth 130 connected to the outer circumferential side of the stator yoke portion 110 in the circumferential direction, the plurality of first stator teeth 120 being arranged at intervals with the plurality of second stator teeth 130, a width of the first stator teeth 120 being smaller than a width of the second stator teeth 130; the stator 210 further comprising a plurality of windings 211, any winding 211 being wound around a corresponding second stator tooth 130; any first stator tooth 120 comprising: a first tooth body 121 connected to the stator yoke portion 110, the width of the first tooth body 121 gradually increasing in a direction away from the stator yoke portion 110.

[0052] The electric machine 200 provided in the present application comprises a stator 210 and a rotor 220, wherein the rotor 220 comprises a stator slot 221, the stator 210 is located in the stator slot 221, the rotor 220 is coaxially arranged with the stator 210, and the rotor 220 is capable of rotating relative to the stator 210. The stator 210 comprises a stator core, and the stator core comprises a plurality of stator core punching sheets 100 stacked together to form the stator core. The structure of the stator core punching sheet 100 is defined as follows: the stator core punching sheet 100 comprises a stator yoke portion 110, a plurality of first stator teeth 120, and a plurality of second stator teeth 130, wherein the plurality of first stator teeth 120 and the plurality of second stator teeth 130 are both connected to the stator yoke portion 110, specifically, the plurality of first stator teeth 120 are connected to an outer circumferential side of the stator yoke portion 110 in a circumferential direction, the plurality of second stator teeth 130 are connected to the outer circumferential side of the stator yoke portion 110 in the circumferential direction, the plurality of first stator teeth 120 are arranged at intervals with the plurality of second stator teeth 130, and any adjacent first stator tooth and second stator tooth 130 together enclose the stator slot 221.

[0053] Further, the stator core punching sheet 100 is used in the stator 210, and a plurality of windings 211 are further included in the stator 210. In a conventional stator 210, the number of windings 211 is the same as the number of stator teeth, and the windings 211 are arranged one by one corresponding to the stator teeth, and the windings 211 are wound on the corresponding stator teeth to fix the windings 211. However, with the miniaturization of the motor 200, the size of the stator 210 is also reduced, and the space between adjacent two stator teeth is also reduced, which leads to the reduction of the installation space of the winding 211 and the increase of the winding difficulty of the winding 211. In order to solve the winding difficulty of the winding 211 in the small motor 200, the winding 211 is wound on the second stator tooth 130, and the winding 211 is not wound on the first stator tooth 120. In this way, the installation space of the winding 211 can be increased, the winding difficulty of the winding 211 is reduced, the number of windings 211 is halved, the production efficiency of the product is improved, and the assembly precision of the winding 211 is improved, and the performance of the product is improved. Further, since each winding 211 is wound on the second stator tooth 130, and the first stator tooth 120 is arranged in a spaced manner with the second stator tooth 130, that is, the first stator tooth 120 is arranged between any two adjacent windings 211, and the windings 211 are separated by the first stator tooth 120. In this case, even if one winding 211 has a problem, it will not affect the adjacent winding 211, and the reliability of the product is improved.

[0054] Further, in order to further increase the installation space of the winding 211, the size of the first stator tooth 120 and the second stator tooth 130 is limited. Specifically, the width of the first stator tooth 120 is less than the width of the second stator tooth 130. Understandably, since the winding 211 is wound on the second stator tooth 130, and the winding 211 is not wound on the first stator tooth 120, that is, the second stator tooth 130 and the adjacent first stator tooth 120 define a stator slot 221 for accommodating the winding 211. The smaller the width of the first stator tooth 120, the larger the space of the stator slot 221, the larger the installation space of the winding 211, and the smaller the winding difficulty of the winding 211. Therefore, in order to further reduce the winding difficulty of the winding 211, the width of the first stator tooth 120 is set to be less than the width of the second stator tooth 130, so that the size of the stator slot 221 can be increased, thereby increasing the installation space of the winding 211, and further reducing the winding difficulty of the winding 211. And, since the winding 211 is not wound on the first stator tooth 120, the stress on the first stator tooth 120 is less than that on the second stator tooth 130. Even if the width of the first stator tooth 120 is less than the width of the second stator tooth 130, there is no risk of the first stator tooth 120 breaking due to insufficient strength.

[0055] Further, when designing the width of the first stator tooth 120 and the width of the second stator tooth 130, the relationship between the pole arc angle occupied by the first stator tooth 120 and the pole arc angle occupied by the second stator tooth 130 needs to be considered. Specifically, the number of the first stator tooth 120 is the same as the number of the second stator tooth 130, both of which are Z, and any one first stator tooth 120 and the adjacent second stator tooth 130 form a stator tooth part, and the tooth arc angle occupied by each stator tooth part is As, and the tooth arc angle occupied by each stator tooth part is composed of the pole arc angle occupied by the first stator tooth 120 contained therein and the pole arc angle occupied by the second stator tooth 130 contained therein. Among them, the pole arc angle occupied by the second stator tooth 130 is 2xAl, the pole arc angle occupied by the first stator tooth 120 is 2x A2, and As = 360° / Z = 2(A1+A2). The distribution of the pole arc angle occupied by the first stator tooth 120 and the pole arc angle occupied by the second stator tooth 130 is closely related to the torque output capability of the motor 200, and the size of the pole arc angle occupied by the first stator tooth 120 and the pole arc angle occupied by the second stator tooth 130 is related to the width of the first stator tooth 120 and the second stator tooth 130. Therefore, a suitable distribution relationship of Al and A2 can be selected to improve the torque density of the motor 200, and then the width of the first stator tooth 120 and the width of the second stator tooth 130 are designed according to Al and A2.

[0056] Further, the structure of the first stator tooth 120 is limited, and any first stator tooth 120 includes a first tooth body 121, the first tooth body 121 is connected with the stator yoke part 110, and the width of the first tooth body 121 gradually increases in the direction away from the stator yoke part 110. The first tooth body 121 is configured as a structure similar to a trapezoid, and the two sides of the first stator tooth 120 can be provided with protruding structures or not. Along the radial direction of the stator core punching sheet 100, the width of the first stator tooth 120 changes, specifically, the width of the first tooth body 121 gradually increases in the direction away from the stator yoke part 110. As Figure 2As shown, the width of the top of the first tooth body 121 is H21, and the width of the root of the first tooth body 121 is H22, and H21>H22. Understandably, if the widths of the first tooth body 121 at different positions along the radial direction of the stator core punching sheet 100 are the same, then the closer to the center of the stator core punching sheet 100, the smaller the width of the stator slot 221, which will result in an increased difficulty in winding the winding 211. In order to further increase the distance between the first stator tooth 120 and the second stator tooth 130 and increase the space of the stator slot 221, the first tooth body 121 is configured to gradually increase in width in the direction away from the stator yoke 110, that is, the closer to the center of the stator core punching sheet 100, the smaller the width of the first tooth body 121. In this way, the space of the stator slot 221 in the center of the stator core punching sheet 100 can be increased, thereby reducing the difficulty in winding the winding 211, improving the assembly efficiency of the product, and also improving the assembly accuracy of the winding 211, thereby improving the performance of the product.

[0057] Furthermore, by configuring the first tooth body 121 to have a structure of narrow at one end and wide at the other end, the winding position in the stator slot 221 can be improved to some extent, so that the winding arrangement of the winding 211 is more uniform from the radial inner side to the radial outer side.

[0058] By setting the first stator tooth 120 and the second stator tooth 130 with different widths in the stator core punching sheet 100 and winding the winding 211 in the motor 200 on the second stator tooth 130 with a wider width, the size of the stator slot 221 between the first stator tooth 120 and the second stator tooth 130 can be increased by setting the first stator tooth 120 with a smaller width, the installation space of the winding 211 is increased, thereby reducing the difficulty in winding the winding 211, improving the assembly efficiency of the product, improving the slot fill rate of the motor 200, and also improving the assembly accuracy of the winding 211, thereby improving the performance of the product. Furthermore, since the winding 211 is wound on the second stator tooth 130, the first stator tooth 120 can separate the adjacent two windings 211, that is, if one winding 211 has a problem, it will not affect the adjacent other windings 211, thereby improving the reliability of the product. By configuring the first tooth body 121 of the first stator tooth 120 to have a structure of gradually increasing in width in the direction away from the stator yoke 110, the space of the stator slot 221 can be increased, thereby increasing the installation space of the winding 211, reducing the difficulty in winding the winding 211, improving the assembly efficiency of the product, and also making the winding arrangement of the winding 211 more uniform from the radial inner side to the radial outer side, thereby improving the assembly accuracy of the winding 211 and improving the performance of the product.

[0059] In an embodiment according to the present application, as shown in Figure 1As shown, any first stator tooth 120 further comprises a first tooth crown 122 connected to an end of the first tooth body 121 away from the stator yoke 110, the first tooth crown 122 protruding from both sides of the first tooth body 121.

[0060] In this embodiment, another structure of the first stator tooth 120 is defined. The first stator tooth 120 can be configured to include only the first tooth body 121, and the first stator tooth 120 can also be configured to include the first tooth body 121 and the first tooth crown 122 connected to the first tooth body 121. In the case where the first stator tooth 120 includes the first tooth crown 122, the first tooth crown 122 is connected to an end of the first tooth body 121 away from the stator yoke 110. Specifically, the first tooth crown 122 has a width greater than the first tooth body 121, and the first tooth crown 122 protrudes from both sides of the first tooth body 121. Understandably, the first stator tooth 120 and the adjacent second stator tooth 130 together form a stator slot 221, and since the first tooth crown 122 is connected to an end of the first tooth body 121 away from the stator yoke 110, the first tooth crown 122 is located at the slot opening of the stator slot 221. The stator slot 221 is used to accommodate the winding 211, and since the first tooth crown 122 protrudes from both sides of the first tooth body 121, the winding 211 disposed in the stator slot 221 can be limited by the protruding first tooth crown 122 to prevent the winding 211 from being pulled out of the stator slot 221, thereby improving the safety and reliability of the product.

[0061] By providing the first tooth crown 122 protruding from the first tooth body 121 in the first stator tooth 120, the winding 211 disposed in the stator slot 221 can be limited by the first tooth crown 122 to prevent the winding 211 from being pulled out of the stator slot 221, thereby improving the safety and reliability of the product.

[0062] In an embodiment according to the present application, as shown in Figure 1 As shown, any second stator tooth 130 comprises a second tooth body 131 connected to the stator yoke 110, and a second tooth crown 132 connected to an end of the second tooth body 131 away from the stator yoke 110, the second tooth crown 132 protruding from both sides of the second tooth body 131, and at least one adjusting groove 133 is provided on the edge of the second tooth crown 132 away from the second tooth body 131.

[0063] In this embodiment, the structure of the second stator tooth 130 is defined. Any second stator 210 includes a second tooth body 131 and a second tooth crown 132, wherein the second tooth body 131 is connected with the stator yoke 110, the second tooth body 131 extends in a radial direction away from the stator yoke 110, and the second tooth crown 132 is connected to one end of the second tooth body 131 away from the stator yoke 110. Specifically, the winding 211 is wound on the second tooth body 131, and if no structure protruding from the second tooth body 131 is provided in the second stator tooth 130, the winding 211 is prone to fall off from the second tooth body 131. In order to avoid the above problem, the second tooth crown 132 is further provided in the second stator tooth 130. Since the second tooth crown 132 is connected to one end of the second tooth body 131 away from the stator yoke 110 and protrudes from both sides of the second tooth body 131, the winding 211 can be limited by the second tooth crown 132 to prevent the winding 211 from falling off from the second tooth body 131, thereby improving the safety and reliability of the product.

[0064] Further, the edge of the second tooth crown 132 away from the second tooth body 131 is provided with at least one adjusting groove 133, wherein the adjusting groove 133 is recessed in the edge of the second tooth crown 132. The number of the second adjusting groove 133 can be one or more. In the case where the number of the second adjusting groove 133 is more than one, the plurality of second adjusting grooves 133 are sequentially arranged along the edge of the second tooth crown 132 away from the stator yoke 110. The second adjusting groove 133 is used to adjust the torque ripple of the motor 200. By providing the second adjusting groove 133, the torque ripple of the motor 200 can be reduced, thereby improving the smoothness of the operation of the motor 200.

[0065] In an embodiment according to the present application, as shown in Figure 1 In the case where the adjusting groove 133 in any second tooth crown 132 is one, the center line of the adjusting groove 133 coincides with the center line of the second tooth crown 132.

[0066] In this embodiment, the position of the adjusting groove 133 is defined. Specifically, in the case where the adjusting groove 133 in any second tooth crown 132 is one, the center line of the adjusting groove 133 coincides with the center line of the second tooth crown 132. Compared with the structure in which the adjusting groove 133 is arranged near the two sides of the second tooth crown 132, by arranging the adjusting groove 133 at the central position of the second tooth crown 132, the center line of the adjusting groove 133 coincides with the center line of the second tooth crown 132, which can further improve the adjusting effect of the adjusting groove 133 on the torque ripple of the motor 200, further reduce the torque ripple of the motor 200, and improve the smoothness of the operation of the motor 200.

[0067] As shown in Figure 1As shown, in one possible embodiment, the slot opening of the stator slot 221 is formed between the first tooth crown 122 of the first stator tooth 120 and the second tooth crown 132 of the second stator tooth 130, and the slot opening width of the stator slot 221 is composed of the slot opening width occupied by the first stator tooth 120 and the slot opening width occupied by the second stator tooth 130, wherein the slot opening width of the stator slot 221 is Ds, the slot opening width occupied by the second stator tooth 130 is D1, the slot opening width occupied by the first stator tooth 120 is D2, and Ds=D1+D2.

[0068] In one embodiment according to the present application, as shown in Figure 2 As shown, the width of the second tooth body 131 gradually increases in the direction away from the stator yoke portion 110.

[0069] In this embodiment, the structure of the second tooth body 131 is limited. The second tooth body 131 is configured as a structure similar to a trapezoid, and the width of the second tooth body 131 changes along the radial direction of the stator core lamination 100. Specifically, the width of the second tooth body 131 gradually increases in the direction away from the stator yoke portion 110, as shown in Figure 2 As shown, the width of the second tooth body top is H11, the width of the second tooth body root is H12, and H11>H12. Understandably, if the width of the second tooth body 131 at each position along the radial direction of the stator core lamination 100 is the same, the width of the stator slot 221 will be smaller in the area closer to the center of the stator core lamination 100, which will result in an increased difficulty in winding the winding 211. In order to further increase the distance between the first stator tooth 120 and the second stator tooth 130 and increase the space of the stator slot 221, the present application configures the second tooth body 131 to gradually increase in width in the direction away from the stator yoke portion 110, i.e., the width of the second tooth body 131 is smaller in the area closer to the center of the stator core lamination 100. In this way, the space of the stator slot 221 in the area closer to the center of the stator core lamination 100 can be increased, thereby reducing the winding difficulty of the winding 211, improving the assembly efficiency of the product, and also improving the assembly precision of the winding 211, which improves the performance of the product.

[0070] By configuring the second tooth body 131 to gradually increase in width in the direction away from the stator yoke portion 110, the space of the stator slot 221 can be increased, thereby increasing the installation space of the winding 211, reducing the winding difficulty of the winding 211, improving the assembly efficiency of the product, and also improving the assembly precision of the winding 211, which improves the performance of the product.

[0071] In one embodiment according to the present application, as shown in Figure 1As shown, the rotor 220 rotates from the first end of the second toothed crown 132 to the second end of the second toothed crown 132, and any second toothed crown 132 comprises: a first sub-toothed crown 134 located at the first end of the second toothed crown 132, the first sub-toothed crown 134 having a first arc-shaped outer edge 136; and a second sub-toothed crown 135 located at the second end of the second toothed crown 132, the second sub-toothed crown 135 having a second arc-shaped outer edge 137, the first arc-shaped outer edge 136 having a smaller curvature radius than the second arc-shaped outer edge 137.

[0072] In this embodiment, the structure of the second toothed crown 132 is further limited. The motor 200 to which the stator core lamination 100 is applied further comprises a rotor 220, the rotor 220 of the motor 200 is coaxially arranged with the stator core lamination 100 and can rotate relative to the stator core lamination 100, specifically, the rotor 220 rotates from the first end of the second toothed crown 132 to the second end of the second toothed crown 132. Any second toothed crown 132 comprises a first sub-toothed crown 134 and a second sub-toothed crown 135, the first sub-toothed crown 134 and the second sub-toothed crown 135 are respectively located at the two ends of the second toothed crown 132, wherein the first sub-toothed crown 134 is located at the first end of the second toothed crown 132, and the second sub-toothed crown 135 is located at the second end of the second toothed crown 132. The side of the first sub-toothed crown 134 and the second sub-toothed crown 135 away from the stator yoke 110 is configured as an arc shape, the first sub-toothed crown 134 has a first arc-shaped outer edge 136, and the second sub-toothed crown 135 has a second arc-shaped outer edge 137, the first arc-shaped outer edge 136 and the second arc-shaped outer edge 137 are located on the side of the second toothed crown 132 away from the stator yoke 110, the first arc-shaped outer edge 136 extends from the slot opening of the adjusting slot 133 to the end of the first sub-toothed crown 134, and the second arc-shaped outer edge 137 extends from the slot opening of the adjusting slot 133 to the end of the second sub-toothed crown 135. In order to further reduce the torque ripple of the motor 200, the curvature radius of the first arc-shaped outer edge 136 and the second arc-shaped outer edge 137 is limited accordingly, specifically, the curvature radius of the first arc-shaped outer edge 136 is smaller than the curvature radius of the second arc-shaped outer edge 137, thus, it is beneficial to reduce the torque ripple of the motor 200, and further improve the stability of the motor 200 in operation.

[0073] In an embodiment according to the present application, as shown in Figure 1 Any first toothed crown 122 comprises: a third sub-toothed crown 123 located at the first end of the first toothed crown 122, the third sub-toothed crown 123 having a third arc-shaped outer edge 125; and a fourth sub-toothed crown 124 located at the second end of the first toothed crown 122, the fourth sub-toothed crown 124 having a fourth arc-shaped outer edge 126, the curvature radius of the third arc-shaped outer edge 125 and / or the curvature radius of the fourth arc-shaped outer edge 126 is smaller than the curvature radius of the arc-shaped outer edge of the stator core assembly.

[0074] In this embodiment, the structure of the first tooth crown 122 is further defined. Any first tooth crown 122 comprises a third sub-tooth crown 123 and a fourth sub-tooth crown 124, which are respectively located at two ends of the first tooth crown 122. The third sub-tooth crown 123 has a third arc-shaped outer edge 125, and the fourth sub-tooth crown 124 has a fourth arc-shaped outer edge 126, both of which are located on the side of the first tooth crown 122 away from the stator yoke 110. In order to further reduce the torque ripple of the motor 200, the curvature radius of the third arc-shaped outer edge 125 and the fourth arc-shaped outer edge 126 is correspondingly defined in the present application. Specifically, the curvature radius of the third arc-shaped outer edge 125 and / or the curvature radius of the fourth arc-shaped outer edge 126 is smaller than the curvature radius of the arc-shaped outer edge of the stator core assembly. In this way, it is beneficial to reduce the torque ripple of the motor 200 and further improve the stability of the motor 200 in operation.

[0075] In the above technical solution, further, the rotor 220 comprises: a rotor yoke 222; a plurality of rotor magnets 223, which are sequentially connected with the rotor yoke 222 in the circumferential direction, and have a spacing between any two adjacent rotor magnets 223, and the rotor magnets 223 are arranged on the side of the rotor yoke 222 facing the stator 210.

[0076] In this embodiment, the structure of the rotor 220 is defined. The rotor 220 comprises a rotor yoke 222 and a plurality of rotor magnets 223, which are sequentially connected with the rotor yoke 222 in the circumferential direction. Specifically, the plurality of rotor magnets 223 are uniformly distributed on the inner side of the rotor yoke 222 in the circumferential direction of the rotor 220.

[0077] In a possible embodiment, the rotor magnets 223 are configured as multi-pole magnetic rings, which are made of permanent magnetic material to form a ring structure and assembled with the rotor yoke 222 to form a nested structure. The integrated magnetic ring is beneficial to simplify the assembly process and improve manufacturing efficiency. Specifically, the multi-pole magnetic ring is made of a rubber magnetic strip and is assembled with the rotor yoke 222 by bending and coiling.

[0078] Further, any two adjacent rotor magnets 223 have a spacing, and the plurality of rotor magnets 223 can realize torque ripple optimization by setting a reasonable spacing.

[0079] In a possible embodiment, the plurality of rotor magnets 223 and the rotor yoke 222 are integrally plasticized and fixed, so as to weaken the deterioration of motor performance caused by process error accumulation.

[0080] In an embodiment according to the present application, as Figure 4As shown, the two ends of any rotor magnet 223 have a first arc-shaped inner edge 224, and the curvature radius of the first arc-shaped inner edge 224 is greater than the curvature radius of the arc-shaped inner edge of the rotor 220.

[0081] In this embodiment, the structure of the rotor magnet 223 is further limited. The two ends of any rotor magnet 223 have a first arc-shaped inner edge 224, and the first arc-shaped inner edge 224 is arranged on the side facing the stator 210. In order to further reduce the torque ripple of the motor 200, the curvature radius of the first arc-shaped inner edge 224 is limited accordingly, specifically, the curvature radius of the first arc-shaped inner edge 224 is greater than the curvature radius of the arc-shaped inner edge of the rotor 220, so as to reduce the torque ripple of the motor 200 and further improve the stability of the motor 200.

[0082] In a possible embodiment, the first arc-shaped inner edge 224 is configured as a chamfered arc structure, which can be a circular arc or a right-angle chamfer, and can be symmetrical or asymmetrical. The second aspect of the present application also provides an electrical appliance comprising the motor 200 according to the first aspect of the present application.

[0083] The electrical appliance provided by the second aspect of the present application has all the beneficial effects of the motor 200.

[0084] In the present application, the term "a plurality of" refers to two or more, unless otherwise explicitly limited. The terms "mount", "connect", "connection", "fix", and the like should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integrally connected; "connection" can be direct connection, or indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0085] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment", and the like, mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0086] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An electric machine characterized in that, Comprising: a rotor, comprising a stator slot; a stator, located in the stator slot, the stator comprising a stator core, the stator core comprising a plurality of stator core laminations stacked together, any of the stator core laminations comprising: a stator yoke portion; a plurality of first stator teeth, the plurality of first stator teeth connected to an outer circumferential side of the stator yoke portion in a circumferential direction; a plurality of second stator teeth, the plurality of second stator teeth connected to an outer circumferential side of the stator yoke portion in a circumferential direction, the plurality of first stator teeth and the plurality of second stator teeth being arranged in an interval manner, a width of the first stator teeth being smaller than a width of the second stator teeth; the stator further comprising a plurality of windings, any of the windings being wound around a corresponding second stator tooth; any of the first stator teeth comprising: a first tooth body, the first tooth body being connected to the stator yoke portion, a width of the first tooth body gradually increasing in a direction away from the stator yoke portion; any of the first stator teeth further comprising: a first tooth crown, the first tooth crown being connected to an end of the first tooth body away from the stator yoke portion, the first tooth crown protruding from both sides of the first tooth body; any of the first tooth crown comprising: a third sub-tooth crown, located at a first end of the first tooth crown, the third sub-tooth crown having a third arc-shaped outer edge; a fourth sub-tooth crown, located at a second end of the first tooth crown, the fourth sub-tooth crown having a fourth arc-shaped outer edge, a radius of curvature of the third arc-shaped outer edge and / or a radius of curvature of the fourth arc-shaped outer edge being smaller than a radius of curvature of an arc-shaped outer edge of the stator core lamination.

2. The electric machine of claim 1, wherein, any of the second stator teeth comprising: a second tooth body, the second tooth body being connected to the stator yoke portion; a second tooth crown, the second tooth crown being connected to an end of the second tooth body away from the stator yoke portion, the second tooth crown protruding from both sides of the second tooth body, at least one adjusting slot being provided at an edge of the second tooth crown away from the second tooth body.

3. The electric machine of claim 2, wherein: in the case that the adjusting slot in any of the second tooth crown is one, a center line of the adjusting slot coincides with a center line of the second tooth crown.

4. The electric machine of claim 2, wherein: a width of the second tooth body gradually increases in a direction away from the stator yoke portion.

5. The electric machine of claim 2, wherein, the rotor rotates from a first end of the second tooth crown to a second end of the second tooth crown, any of the second tooth crown comprising: a first sub-tooth crown, located at the first end of the second tooth crown, the first sub-tooth crown having a first arc-shaped outer edge; a second sub-tooth crown, located at the second end of the second tooth crown, the second sub-tooth crown having a second arc-shaped outer edge, a radius of curvature of the first arc-shaped outer edge being smaller than a radius of curvature of the second arc-shaped outer edge.

6. The electric machine of claim 1, wherein, the rotor comprising: a rotor yoke portion; a plurality of rotor magnets, the plurality of rotor magnets being connected to the rotor yoke portion in a circumferential direction in sequence, any two adjacent rotor magnets having a spacing therebetween, the rotor magnets being provided on a side of the rotor yoke portion facing the stator.

7. The electric machine of claim 6, wherein: both ends of any of the rotor magnets have a first arc-shaped inner edge, a radius of curvature of the first arc-shaped inner edge being larger than a radius of curvature of an arc-shaped inner edge of the rotor.

8. An electrical appliance, characterized in that Comprising: The electric machine as claimed in any one of claims 1 to 7.

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