CN117498586A - Stator punching sheet, stator structure and motor - Google Patents

Abstract

The invention provides a stator punching sheet, a stator structure and a motor, wherein a plurality of stator grooves are formed in the stator punching sheet, and the plurality of stator grooves are arranged at intervals along the circumferential direction of the stator punching sheet; a stator tooth is formed between two adjacent stator grooves; the stator teeth are used for winding the stator windings; a notch is arranged between two adjacent stator teeth and is communicated with a corresponding stator groove; at least one stator tooth is provided with a stator groove, and an opening of the stator groove faces the circle center of the stator punching sheet; the distance between two ends of the notch in the circumferential direction of the stator punching sheet is notch width k1, the distance between two ends of the stator groove in the circumferential direction of the stator punching sheet is groove width k2, and k2 is more than or equal to 0.8 and less than or equal to 1.6 and k1. The invention solves the problems of difficult motor starting and large motor noise, and particularly aims at the existing single-phase asynchronous motor, and the single-phase asynchronous motor with the structure has good starting performance and small vibration noise, and is suitable for large-area popularization and use.

Description

Stator punching sheet, stator structure and motor

Technical Field

The invention relates to the technical field of motor equipment, in particular to a stator punching sheet, a stator structure and a motor.

Background

At present, the single-phase induction motor adopting the single-phase concentrated winding has high winding utilization rate, less tooth grooves, long and short winding time, can effectively reduce copper consumption of the winding, and has low process cost, so that the single-phase induction motor is widely applied to various fields of air conditioners, household appliances and the like; however, the stator slots of the concentrated winding are fewer, the stator teeth have low harmonic frequency and large harmonic amplitude, the motor can generate low-order electromagnetic force due to low-order harmonic, and the problem of vibration noise of the motor is easily caused; and the concentrated winding type single-phase induction motor has various complex harmonic components, so that the concentrated winding type single-phase induction motor often has obvious asynchronous additional torque, and further the starting curve of the motor is obviously concave, so that the starting characteristic of the motor is poor, and the efficiency and the output capacity of the motor are greatly reduced.

In the prior art, there are some stator structures for single-phase induction motors, for example, patent application No. 201220361292.8 discloses a stator structure for single-phase induction motor, which comprises a stator provided with stator teeth, wherein concentrated windings are wound on each stator tooth, the arc surface of the stator teeth facing to the motor air gap is formed by three sections of tangent arcs, the center of the middle arc of the stator teeth is concentric with the center of the motor air gap, and the centers of the arcs at the two ends of the stator teeth are not concentric with the center of the motor air gap. The motor with the stator structure has slightly increased torque in a low-speed section, has little effect of improving the starting capability of the motor, and the stator of the motor is manufactured by a strip-shaped split iron core, so that the process is complex and the cost is high.

Disclosure of Invention

The invention provides a stator punching sheet, a stator structure and a motor, which are used for solving the problems that the motor in the prior art is difficult to start and the motor noise is large.

In order to solve the above-described problems, according to an aspect of the present invention, there is provided a stator lamination, a plurality of stator laminations for forming a stator core in an axial direction; the stator punching sheet is internally provided with a plurality of stator grooves which are arranged at intervals along the circumferential direction of the stator punching sheet; a stator tooth is formed between two adjacent stator grooves; the stator teeth are used for winding the stator windings; a notch is arranged between two adjacent stator teeth and is communicated with a corresponding stator groove; at least one stator tooth is provided with a stator groove, and an opening of the stator groove faces the circle center of the stator punching sheet; the distance between two ends of the notch in the circumferential direction of the stator punching sheet is notch width k1, the distance between two ends of the stator groove in the circumferential direction of the stator punching sheet is groove width k2, and k2 is more than or equal to 0.8 and less than or equal to 1.6 and k1.

Further, the stator punching sheet is a round punching sheet; carrying out plane projection on the stator punching sheet along the axial direction, wherein the projection of the stator teeth is provided with a central axis, and the projections of two stator slots on two sides of the stator teeth are symmetrically arranged along the central axis of the stator teeth; the projections of the plurality of stator slots are symmetrically arranged relative to the projection of the circle center of the stator punching sheet.

Further, the stator punching sheet comprises a stator yoke part, the stator yoke part is of an annular structure, the stator teeth comprise tooth bodies and tooth shoes, and one ends of the tooth bodies are fixedly connected with an inner ring of the stator yoke part; the tooth boots are connected with the other end of the tooth body, the tooth boots extend along the circumference of the stator yoke, one side end face of each tooth boot, deviating from the tooth body, is an arc-shaped face, and the stator groove is formed in the arc-shaped face.

Further, the stator punching sheet is subjected to plane projection along the axial direction, the projection of the stator teeth is provided with a central axis, and the projection of two stator grooves on two sides of the stator teeth and the projection of the notch on two sides of the stator teeth are symmetrically arranged along the central axis of the stator teeth.

Further, the stator punching sheet is subjected to plane projection along the axial direction, the projection of the stator teeth is provided with a central axis, and the dimension of the stator groove in the extending direction of the central axis of the stator teeth is the depth m2 of the groove; the size of the notch in the extending direction of the projected central axis of the stator slot is the notch depth m1; wherein, m < 2 > is more than or equal to 0.6 and less than or equal to 1.5, m < 1 >.

Further, each stator tooth has a stator groove thereon.

Further, the stator groove is an arc groove, the stator punching sheet is projected in a plane along the axial direction, and the projection of the arc groove is arc; or the stator groove is a square groove, the stator punching sheet is projected on the plane along the axial direction, and the projection of the square groove is square.

According to another aspect of the present invention, there is provided a stator structure including a stator core and a stator winding, the stator core being formed by stacking the stator laminations described above in an axial direction; the stator winding is a plurality of, and stator winding sets up on stator tooth, and is located two adjacent stator slots.

Further, the stator punching sheets at two ends of the plurality of stator punching sheets which are sequentially stacked along the axial direction are respectively a first punching sheet and a last punching sheet; a plurality of stator grooves in the first punching sheet and a plurality of stator grooves in the last punching sheet are correspondingly communicated one by one, one stator groove on the first punching sheet is set as a first positioning groove, and the stator groove on the last punching sheet correspondingly communicated with the first positioning groove is set as a second positioning groove; the central axis of the projection of the first positioning groove in the axial direction and the central axis of the projection of the second positioning groove in the axial direction form an included angle.

Further, an included angle between a central axis of the projection of the first positioning groove in the axial direction and a central axis of the projection of the second positioning groove in the axial direction is alpha, tooth pitches of two adjacent stator teeth are tau, and the number of the plurality of stator teeth on one stator punching sheet is N, wherein tau=360 degrees/N, and 0.18 is less than or equal to alpha is less than or equal to 0.34.

Further, the stator structure is provided with a reference axis which sequentially penetrates through the circle centers of the plurality of stator punching sheets in the axial direction, and two adjacent stator punching sheets rotate relative to the reference axis according to a fixed angle; the stator grooves of the stator punching sheets are sequentially communicated in the axial direction to form a space chute; the stator slots of the stator punching sheets are sequentially communicated along the axial direction, and the projections of the stator slots in the axial direction are overlapped.

Further, the rotation direction from the projected central axis of the first positioning groove in the axial direction to the projected central axis of the second positioning groove in the axial direction is the offset direction of the chute according to the minimum angle; the stator structure is used for working in cooperation with the rotor structure, and the stator structure is enclosed outside the rotor structure; wherein, the offset direction of chute is the same with the rotation direction of rotor structure during operation.

Further, the stator winding is divided into a main phase winding and a secondary phase winding according to different turns, and one main phase winding or one secondary phase winding is wound on one stator tooth; the number of turns of the secondary phase winding is N1, and the number of turns of the main phase winding is N2, wherein N1 is more than or equal to 0.83 and less than or equal to N2 and less than or equal to 0.9 and less than or equal to N1.

According to another aspect of the present invention, there is provided an electric motor comprising a rotor structure and the stator structure described above.

Further, setting the pole pair number of the motor as P, and setting the pole number of the motor as 2P; the number of the plurality of stator teeth on the stator lamination is N, wherein 2 x 2P < N < 5 x 2P, and N is an integer multiple of P.

By applying the technical scheme, the invention provides a stator punching sheet, wherein a plurality of stator punching sheets are used for forming a stator core along the axial direction in a stacking way; the stator punching sheet is internally provided with a plurality of stator grooves which are arranged at intervals along the circumferential direction of the stator punching sheet; a stator tooth is formed between two adjacent stator grooves; the stator teeth are used for winding the stator windings; a notch is arranged between two adjacent stator teeth and is communicated with a corresponding stator groove; at least one stator tooth is provided with a stator groove, and an opening of the stator groove faces the circle center of the stator punching sheet; the distance between two ends of the notch in the circumferential direction of the stator punching sheet is notch width k1, the distance between two ends of the stator groove in the circumferential direction of the stator punching sheet is groove width k2, and k2 is more than or equal to 0.8 and less than or equal to 1.6 and k1. According to the invention, the stator grooves are formed in at least one stator tooth, so that the number of notches is increased in use effect, the number of tooth harmonic waves is increased when the motor is in operation, the amplitude is reduced, the problem that the starting torque of the motor is concave is solved, and the starting capability of the motor is improved; the distance between two ends of the notch in the circumferential direction of the stator punching sheet is the notch width k1, the distance between two ends of the stator groove in the circumferential direction of the stator punching sheet is the groove width k2,0.8 x k1 is less than or equal to k2 and less than or equal to 1.6 x k1, the groove width of the stator groove is effectively restrained, the design of a plurality of stator grooves on one stator tooth is possible, the number of the notches is increased to the maximum extent, the tooth harmonic frequency of the motor is further increased, the amplitude is reduced, and the additional torque of the motor is reduced; meanwhile, the motor with the stator punching sheet provided by the invention has the advantages that the tooth harmonic intensity and the torque pulsation are effectively reduced, so that the vibration noise of the motor is reduced; the invention solves the problems of difficult motor starting and large motor noise, and particularly aims at the existing single-phase asynchronous motor, and the single-phase asynchronous motor with the structure has good starting performance and small vibration noise, and is suitable for large-area popularization and use.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

FIG. 1 illustrates a schematic view of a stator lamination in an axial direction provided by an embodiment of the present invention;

FIG. 2 is a schematic view of an axial projection of a first punch provided by an embodiment of the present invention;

FIG. 3 illustrates a schematic view of another stator lamination in an axial direction provided by an embodiment of the present invention;

FIG. 4 shows a schematic view of the projection of the first and last punches in the axial direction provided by an embodiment of the present invention;

fig. 5 is a schematic view showing a part of the structure of a stator structure and a rotor structure in a motor according to an embodiment of the present invention;

FIG. 6 shows a graph of experimental data for additional torque, current third harmonic, and torque ripple following a/τ change provided by an embodiment of the present invention;

fig. 7 shows a comparison of the rotational speed-torque relationship of the motor proposed by the present invention and the motor of the prior art.

Fig. 8 shows a comparison of electromagnetic force harmonic analysis of the motor proposed by the present invention and the motor of the prior art.

Wherein the above figures include the following reference numerals:

10. a stator groove;

20. stator teeth; 21. a tooth body; 22. a tooth boot; 221. an arc surface;

30. a notch;

40. a stator groove;

50. a stator yoke;

60. a first positioning groove;

70. a second positioning groove;

80. a rotor structure.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1 to 4, an embodiment of the present invention provides a stator lamination, a plurality of stator laminations being used to axially stack to form a stator core; the stator punching sheet is internally provided with a plurality of stator grooves 10, and the plurality of stator grooves 10 are arranged at intervals along the circumferential direction of the stator punching sheet; a stator tooth 20 is formed between two adjacent stator slots 10; the stator teeth 20 are used for winding the stator windings; a notch 30 is arranged between two adjacent stator teeth 20, and the notch 30 is communicated with the corresponding stator slot 10; at least one stator tooth 20 is provided with a stator groove 40, and an opening of the stator groove 40 faces the circle center of the stator punching sheet; the distance between the two ends of the notch 30 in the circumferential direction of the stator punching sheet is a notch width k1, the distance between the two ends of the stator groove 40 in the circumferential direction of the stator punching sheet is a groove width k2, and k2 is equal to or less than 0.8×k1 and equal to or less than 1.6×k1.

According to the invention, the stator grooves 40 are formed in at least one stator tooth 20, so that the number of the notches 30 is increased in use effect, the number of tooth harmonic waves of the motor is increased during operation, the amplitude is reduced, the problem of concave starting torque of the motor is further solved, and the starting capability of the motor is improved; by setting the distance between the two ends of the notch 30 in the circumferential direction of the stator punching sheet to be the notch width k1, the distance between the two ends of the stator groove 40 in the circumferential direction of the stator punching sheet to be the groove width k2,0.8 x k1 is less than or equal to k2 and less than or equal to 1.6 x k1, the groove width of the stator groove 40 is effectively restrained, the design of a plurality of stator grooves 40 on one stator tooth 20 is enabled, the number of the notches 30 is increased to the maximum, the number of tooth harmonic times of the motor is further increased, the amplitude is reduced, and the additional torque of the motor is reduced; meanwhile, the motor with the stator punching sheet provided by the invention has the advantages that the tooth harmonic intensity and the torque pulsation are effectively reduced, so that the vibration noise of the motor is reduced; the invention solves the problems of difficult motor starting and large motor noise, and particularly aims at the existing single-phase asynchronous motor, and the single-phase asynchronous motor with the structure has good starting performance and small vibration noise, and is suitable for large-area popularization and use.

As shown in fig. 1, 2 and 3, the stator laminations are circular laminations; the stator punching sheet is axially projected in a plane, the projection of the stator teeth 20 is provided with a central axis, and the projections of the two stator slots 10 on two sides of the stator teeth 20 are symmetrically arranged along the central axis of the stator teeth 20; the projections of the plurality of stator slots 10 are symmetrically arranged with respect to the projection of the center of the stator lamination.

By arranging the projections of the two stator slots 10 symmetrically along the central axis and the projections of the plurality of stator slots 10 symmetrically relative to the projection of the center of the stator punching, the center of mass of the stator punching is ensured to fall on the central axis of the stator punching, and the stability of the stator punching is further ensured.

It should be noted that: the meaning of "the projection of the plurality of stator slots 10 is symmetrically arranged with respect to the projection of the center of the stator lamination" referred to in the present invention is: the plurality of stator slots 10 may be numbered sequentially and grouped, for example: as shown in fig. 2, eight stator slots 10 are all numbered in sequence in the clockwise direction and then grouped, the projections of the first stator slot and the fifth stator slot in the axial direction are symmetrically arranged relative to the projection of the center of the stator punching sheet, the projections of the second stator slot and the sixth stator slot in the axial direction are symmetrically arranged relative to the projection of the center of the stator punching sheet, the projections of the third stator slot and the seventh stator slot in the axial direction are symmetrically arranged relative to the projection of the center of the stator punching sheet, and the projections of the fourth stator slot and the eighth stator slot in the axial direction are symmetrically arranged relative to the projection of the center of the stator punching sheet, namely, after being grouped, the two stator slots 10 in the same group are symmetrically arranged relative to the center of the center.

As shown in fig. 1, 2, 3 and 4, the stator punching sheet comprises a stator yoke 50, the stator yoke 50 is in an annular structure, the stator teeth 20 comprise a tooth body 21 and a tooth shoe 22, and one end of the tooth body 21 is fixedly connected with an inner ring of the stator yoke 50; the tooth shoe 22 is connected with the other end of the tooth body 21, and the tooth shoe 22 extends along the circumferential direction of the stator yoke 50, the end surface of one side of the tooth shoe 22 facing away from the tooth body 21 is an arc surface 221, and the stator groove 40 is arranged on the arc surface 221. The stator punching sheet is simple in structure and reliable in operation.

As shown in fig. 2, 3 and 4, the stator punching sheet is projected in a plane along the axial direction, the projection of the stator teeth 20 has a central axis, and the projections of the two stator slots 10 on both sides of the stator teeth 20 and the projections of the notches 30 on both sides of the stator teeth 20 are symmetrically arranged along the central axis of the stator teeth 20.

By arranging the projections of the two stator slots 10 and the projections of the two notches 30, the projections are symmetrically arranged along the central axis of the stator teeth 20, so that the stability of the stator punching sheet is ensured, and the stator punching sheet is convenient to process.

As shown in fig. 1 and 2, the stator punching sheet is axially projected in a plane, the projection of the stator teeth 20 has a central axis, and the dimension of the stator groove 40 in the extending direction of the central axis of the stator teeth 20 is a groove depth m2; the size of the notch 30 in the extending direction of the projected central axis of the stator slot 10 is a notch depth m1; wherein, m < 2 > is more than or equal to 0.6 and less than or equal to 1.5, m < 1 >.

By setting 0.6m1.ltoreq.m2.ltoreq.1.5m1, the reduction of the amplitude of the current main harmonic of the motor is realized, and the additional torque of the motor is further reduced.

As shown in fig. 5, in one embodiment of the present invention, a rotor structure 80 in an electric motor includes a rotor core formed by axially stacking rotor laminations; the rotor punching sheet is internally provided with a plurality of rotor grooves which are arranged at intervals along the circumferential direction of the rotor punching sheet; a rotor tooth is formed between two adjacent rotor grooves; the rotor slot is provided with a rotor opening at one end far away from the center of the rotor punching sheet, the rotor punching sheet is axially projected in a plane, the projection of the rotor slot is provided with a central axis, the projection of the rotor slot and the projection of the rotor opening are symmetrically arranged along the central axis of the rotor slot, and the dimension of the rotor opening in the extending direction of the central axis of the rotor slot is the rotor opening depth m3; wherein, m < 1 > is less than or equal to 1.8, m < 3 > is less than or equal to 2.0; by setting 1.8m3.ltoreq.m1.ltoreq.2.0m3, the pulsation torque of the motor can be effectively reduced, the torque waveform of the motor can be improved, and the vibration noise of the motor can be reduced.

In another embodiment of the present invention, as shown in fig. 5, the distance between two ends of the rotor opening in the circumferential direction of the rotor sheet is the rotor opening width k3, wherein 0.4×k1+.k3+.0.5×k1. By setting 0.4xk1.ltoreq.k3.ltoreq.0.5xk1, the rotor opening has proper opening width, and proper opening width can increase the frequency of tooth harmonic wave, reduce the amplitude of tooth harmonic wave, weaken asynchronous additional torque of the motor, and further improve the starting capability of the motor.

As shown in fig. 2, 3 and 4, each stator tooth 20 has a stator groove 40 thereon. The arrangement ensures the uniformity of the overall mass distribution of the stator punching sheet.

Specifically, the stator groove 40 is an arc groove, the stator punching sheet is projected in a plane along the axial direction, and the projection of the arc groove is arc; alternatively, the stator groove 40 is a square groove, and the stator punching sheet is projected in a plane along the axial direction, and the projection of the square groove is square.

By arranging the stator groove 40 as an arc groove, the cutting processing and/or the integral forming of the stator groove 40 are facilitated, and meanwhile, the problem of stress concentration can be reduced by the arc groove, so that the stability of the stator punching sheet is improved; by arranging the stator groove 40 as a square groove, under the condition that the width of the groove is the same as that of the arc groove, the volume of the stator groove 40 is convenient to improve, the integral quality of stator punching sheets can be reduced, the number of tooth harmonic waves of the motor is increased when the motor is in operation, the amplitude is reduced, the problem that the starting torque of the motor is concave is solved, and the starting capability of the motor is improved.

The invention also provides a stator structure, which comprises a stator core and a stator winding, wherein the stator core is formed by stacking the stator punching sheets along the axial direction; the stator windings are a plurality of, and the stator windings are wound on the stator teeth 20 and are positioned in two adjacent stator slots 10. The arrangement ensures the working reliability of the stator structure and the simplification and the light weight of the stator structure.

As shown in fig. 2, 3 and 4, the stator punching sheets at two ends of the plurality of stator punching sheets in the axial direction, which are sequentially stacked along the axial direction, are respectively a first punching sheet and a last punching sheet; the stator grooves 40 in the first punching sheet and the stator grooves 40 in the last punching sheet are correspondingly communicated one by one, one stator groove 40 on the first punching sheet is set as a first positioning groove 60, and the stator groove 40 on the last punching sheet correspondingly communicated with the first positioning groove 60 is set as a second positioning groove 70; wherein, the central axis of the projection of the first positioning groove 60 in the axial direction forms an included angle with the central axis of the projection of the second positioning groove 70 in the axial direction.

Through setting up the projected axis of first constant head tank 60 in the axial and the projected axis of second constant head tank 70 in the axial have the contained angle for the holistic barycenter of stator core takes place certain skew for the axis of stator core, has effectively reduced the torque ripple of motor during operation, makes the motor tooth harmonic frequency increase when the operation, and the amplitude reduces, and then has improved the problem that the motor starts torque and concave, has promoted the starting capability of motor, and has reduced the vibration noise of motor.

For ease of understanding, it is to be noted that: assuming that when the projections of the first punching sheet and the last punching sheet in the axial direction are completely overlapped, the stator groove 40 on one first punching sheet is a first positioning groove 60, and the stator groove 40 on the last punching sheet which is completely overlapped with the projection of the first positioning groove 60 is a second positioning groove 70; of course, the projections of the first positioning groove 60 and the second positioning groove 70 in the axial direction do not completely overlap in the actual present invention.

As shown in fig. 4, the angle between the central axis of the projection of the first positioning slot 60 in the axial direction and the central axis of the projection of the second positioning slot 70 in the axial direction is α, the pitch of two adjacent stator teeth 20 is τ, and the number of the plurality of stator teeth 20 on one stator lamination is N, where τ=360 °/N, and τ is 0.18 τ+.ltoreq.0.34 τ.

By setting 0.18 τ.ltoreq.α.ltoreq.0.34 τ, the degree of offset of the plurality of stator grooves 40 in the axial direction is effectively controlled, and thus the additional torque, the third harmonic of current, and the torque ripple of the motor can be effectively reduced.

It should be noted that: as shown in fig. 6, analysis of the relevant experimental data shows that as α/τ increases, the degree of offset of the plurality of stator grooves 40 in the axial direction increases, and the additional torque, the third harmonic of current, and the torque ripple of the motor decrease.

Specifically, the stator structure is provided with a reference axis which sequentially penetrates through the circle centers of the plurality of stator punching sheets in the axial direction, and two adjacent stator punching sheets rotate relative to the reference axis according to a fixed angle; the stator grooves 40 of the stator punching sheets are sequentially communicated in the axial direction to form a space chute; the stator slots 10 of the stator punching sheets are sequentially communicated in the axial direction, and projections of the stator slots 10 in the axial direction are overlapped.

By arranging two adjacent stator punching sheets to rotate relative to the reference axis according to a fixed angle, a plurality of stator punching sheets can be stacked in a staggered manner according to an equal angle, and further the working reliability of the stator core is ensured; meanwhile, the arrangement is convenient for the integral processing and forming of the space chute; the space chute can be arranged into a linear chute or a curve chute according to the actual use requirement.

As shown in fig. 4, the rotation direction from the projected central axis of the first positioning groove 60 in the axial direction to the projected central axis position of the second positioning groove 70 in the axial direction is the chute offset direction; the stator structure is used for cooperating with the rotor structure 80, and the stator structure is enclosed outside the rotor structure 80; wherein the direction of chute bias is the same as the direction of rotation of the rotor structure 80 when in operation.

By providing the chute offset direction to be the same as the direction of rotation of the rotor structure 80 when in operation, the tooth harmonics of the motor can be reduced, thereby reducing the torque ripple of the motor.

Specifically, the stator winding is divided into a main phase winding and a sub-phase winding according to the number of turns, and one main phase winding or one sub-phase winding is wound on one stator tooth 20; the number of turns of the secondary phase winding is N1, and the number of turns of the main phase winding is N2, wherein N1 is more than or equal to 0.83 and less than or equal to N2 and less than or equal to 0.9 and less than or equal to N1.

By setting 0.83 x N1 to N2 to N1, the cogging harmonic of the motor can be reduced, the current harmonic amplitude of the motor can be reduced, the loss can be reduced, and the working efficiency of the motor can be improved.

As shown in fig. 5, the present invention also provides an electric motor comprising a rotor structure 80 and the stator structure described above. The motor provided by the invention, especially a single-phase asynchronous motor, is easy to start and has small motor noise, and is suitable for large-area popularization and use.

It should be noted that: as shown in fig. 7, comparing the rotation speed-torque relationship between the motor provided by the invention and the motor in the prior art, the technical scheme provided by the invention can reduce the electromagnetic force harmonic amplitude and vibration noise of the motor, and simultaneously can reduce the additional torque of the motor, so that the starting capability of the motor is improved, and the analysis of relevant experimental data shows that the additional torque of the motor is reduced by about 5.28% compared with the motor in the prior art, so that the concave degree of the starting curve of the motor is greatly reduced.

Specifically, setting the pole pair number of the motor to be P, and setting the pole number of the motor to be 2P; the number of the plurality of stator teeth 20 on the stator lamination is N, wherein 2 x 2P < N < 5 x 2P, and N is an integer multiple of P.

By setting 2 x 2P < N < 5 x 2P, and N being an integer multiple of the pole pair number P, the number relationship between the number of stator teeth 20 and the number of motor poles is effectively defined, so that the number of tooth harmonics of the motor can be increased, the amplitude of the tooth harmonics of the motor can be reduced, and the additional torque and torque ripple of the motor can be reduced.

It should be noted that: as shown in fig. 8, comparing the electromagnetic force harmonic waves of the motor proposed by the present invention with those of the motor in the prior art, it is found through the analysis of the related experimental data that the torque ripple of the motor can be effectively reduced by at least 57.3% compared with the motor scheme in the prior art by applying the technique of the present invention.

In summary, the present invention provides a stator punching sheet, a stator structure and a motor, wherein the stator slots 40 are provided on at least one stator tooth 20, which is equivalent to increasing the number of slots 30 in use effect, so that the number of tooth harmonic wave times is increased and the amplitude is reduced when the motor is in operation, thereby improving the problem of concave starting torque of the motor and improving the starting capability of the motor; by setting the distance between the two ends of the notch 30 in the circumferential direction of the stator punching sheet to be the notch width k1, the distance between the two ends of the stator groove 40 in the circumferential direction of the stator punching sheet to be the groove width k2,0.8 x k1 is less than or equal to k2 and less than or equal to 1.6 x k1, the groove width of the stator groove 40 is effectively restrained, the design of a plurality of stator grooves 40 on one stator tooth 20 is enabled, the number of the notches 30 is increased to the maximum, the number of tooth harmonic times of the motor is further increased, the amplitude is reduced, and the additional torque of the motor is reduced; meanwhile, the motor with the stator punching sheet provided by the invention has the advantages that the tooth harmonic intensity and the torque pulsation are effectively reduced, so that the vibration noise of the motor is reduced; the invention solves the problems of difficult motor starting and large motor noise, and particularly aims at the existing single-phase asynchronous motor, and the single-phase asynchronous motor with the structure has good starting performance and small vibration noise, and is suitable for large-area popularization and use.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (15)

1. A plurality of stator punching sheets are used for forming a stator core in an axial stacking way; the stator punching sheet is internally provided with a plurality of stator grooves (10), and the stator grooves (10) are arranged at intervals along the circumferential direction of the stator punching sheet; a stator tooth (20) is formed between two adjacent stator slots (10); the stator teeth (20) are used for winding stator windings; a notch (30) is arranged between two adjacent stator teeth (20), and the notch (30) is communicated with the corresponding stator slot (10); at least one stator tooth (20) is provided with a stator groove (40), and an opening of the stator groove (40) faces to the circle center of the stator punching sheet; the distance between two ends of the notch (30) in the circumferential direction of the stator punching sheet is a notch width k1, and the distance between two ends of the stator groove (40) in the circumferential direction of the stator punching sheet is a groove width k2, wherein k1 is more than or equal to 0.8 x k2 and less than or equal to 1.6 x k1.

2. The stator lamination of claim 1, wherein the stator lamination is a circular lamination; carrying out plane projection on the stator punching sheet along the axial direction, wherein the projection of the stator teeth (20) is provided with a central axis, and the projections of the two stator grooves (10) on two sides of the stator teeth (20) are symmetrically arranged along the central axis of the stator teeth (20); the projections of the stator slots (10) are symmetrically arranged relative to the projection of the circle center of the stator punching sheet.

3. The stator punching sheet according to claim 1, characterized in that the stator punching sheet comprises a stator yoke (50), the stator yoke (50) is of an annular structure, the stator teeth (20) comprise a tooth body (21) and a tooth shoe (22), and one end of the tooth body (21) is fixedly connected with an inner ring of the stator yoke (50); the tooth shoe (22) is connected with the other end of the tooth body (21), the tooth shoe (22) extends along the circumference of the stator yoke (50), one side end surface of the tooth shoe (22) deviating from the tooth body (21) is an arc-shaped surface (221), and the stator groove (40) is formed in the arc-shaped surface (221).

4. Stator punching sheet according to claim 1, characterized in that the stator punching sheet is projected in a plane in the axial direction, the projection of the stator teeth (20) has a central axis, and the projections of the two stator slots (10) on both sides of the stator teeth (20) and the projections of the notches (30) on both sides of the stator teeth (20) are arranged symmetrically along the central axis of the stator teeth (20).

5. Stator punching sheet according to claim 4, characterized in that the stator punching sheet is projected in a plane in the axial direction, the projection of the stator teeth (20) having a central axis, the stator groove (40) having a dimension in the direction of extension of the central axis of the stator teeth (20) of a groove depth m2; the size of the notch (30) in the extending direction of the projected central axis of the stator slot (10) is a notch depth m1; wherein, m < 2 > is more than or equal to 0.6 and less than or equal to 1.5, m < 1 >.

6. The stator lamination of claim 1, wherein each of the stator teeth (20) has one of the stator grooves (40) thereon.

7. Stator punching sheet according to claim 1, characterized in that the stator recess (40) is an arc-shaped slot, which is projected in a plane in the axial direction, the projection of the arc-shaped slot being an arc; or, the stator groove (40) is a square groove, the stator punching sheet is subjected to plane projection along the axial direction, and the projection of the square groove is square.

8. A stator structure comprising a stator core and a stator winding, the stator core being formed by stacking stator laminations according to any one of claims 1 to 7 in an axial direction; the stator windings are wound on the stator teeth (20) and are positioned in two adjacent stator slots (10).

9. The stator structure according to claim 8, wherein the stator laminations at both ends in the axial direction of the plurality of stator laminations stacked in order in the axial direction are respectively a first lamination and a last lamination; the stator grooves (40) in the first punching sheet and the stator grooves (40) in the last punching sheet are correspondingly communicated one by one, one stator groove (40) on the first punching sheet is set to be a first positioning groove (60), and the stator groove (40) on the last punching sheet, which is correspondingly communicated with the first positioning groove (60), is set to be a second positioning groove (70); wherein, the central axis of the projection of the first positioning groove (60) in the axial direction and the central axis of the projection of the second positioning groove (70) in the axial direction have an included angle.

10. The stator structure according to claim 9, characterized in that an angle between a projected central axis of the first positioning slot (60) and a projected central axis of the second positioning slot (70) in the axial direction is α, a pitch of two adjacent stator teeth (20) is τ, and the number of the plurality of stator teeth (20) on one stator punching sheet is N, where τ=360 °/N, and τ.18 x τ is equal to or less than or equal to 0.34 x τ.

11. The stator structure of claim 9, wherein the stator structure has a reference axis extending through the centers of a plurality of stator laminations in sequence in an axial direction, and two adjacent stator laminations rotate at a fixed angle relative to the reference axis; the stator grooves (40) of the stator punching sheets are sequentially communicated in the axial direction to form a space chute; the stator slots (10) of the stator punching sheets are sequentially communicated along the axial direction, and projections of the stator slots (10) in the axial direction are overlapped.

12. The stator structure according to claim 11, wherein a rotational direction of the projected central axis of the first positioning groove (60) in the axial direction to a position of the projected central axis of the second positioning groove (70) in the axial direction is a chute offset direction; the stator structure is used for cooperating with a rotor structure (80), and the stator structure is enclosed outside the rotor structure (80); wherein the chute bias direction is the same as the direction of rotation of the rotor structure (80) when in operation.

13. The stator structure according to claim 8, characterized in that the stator winding is divided into a main phase winding and a sub-phase winding according to the number of turns, one of the stator teeth (20) being wound with one of the main phase winding or the sub-phase winding; the number of turns of the secondary phase winding is N1, and the number of turns of the main phase winding is N2, wherein N1 is more than or equal to 0.83 and less than or equal to N2 and less than or equal to 0.9 and less than or equal to N1.

14. An electric motor characterized by comprising a rotor structure (80) and a stator structure as claimed in any one of claims 8 to 13.

15. The motor of claim 14, wherein the motor pole number is 2P if the motor pole pair number is P; the number of the plurality of stator teeth (20) on the stator lamination is N, wherein 2 x 2P < N < 5 x 2P, and N is an integer multiple of P.