CN211830353U - Single-phase permanent magnet synchronous motor and dust collector with same - Google Patents

Abstract

The utility model provides a single-phase PMSM and have its dust catcher. The single-phase permanent magnet synchronous motor comprises a stator part, wherein the stator part is provided with a plurality of stator teeth, the plurality of stator teeth enclose a working cavity for accommodating a rotor part, a beveling structure is arranged at the tooth shoe position of at least one stator tooth in the plurality of stator teeth, the beveling structure is arranged towards the rotor part, and an air gap thickness is formed between the beveling structure and the rotor part. The structural design of the tail end of the stator tooth shoe warping outwards enables the corresponding asymmetric air gap to further enlarge the deviation angle between the center line of the rotor magnetic pole and the center line of the stator tooth relative to a gradual change type air gap structure, obviously improves the starting torque of the motor, can be applied to occasions with high requirements on the starting torque of the motor, and increases the application range of the motor. On the other hand, the starting torque of the motor is larger, and the time for accelerating the motor from a static state to a synchronous rotating speed is further shortened. The problem that zero exists in the starting of the motor is effectively solved.

Description

Single-phase permanent magnet synchronous motor and dust collector with same

Technical Field

The utility model relates to an electrical equipment technical field particularly, relates to a single-phase PMSM and have its dust catcher.

Background

For a single-phase permanent magnet synchronous motor with a uniform air gap, the number of pole pairs of a stator corresponds to the number of pole pairs of a rotor, and cogging torque with periodic change can be generated under the action of a magnetic field generated by a rotor permanent magnet and a stator salient pole. The motor is stopped at a position where the cogging torque is zero, that is, at a position where the center line of the rotor magnetic pole coincides with the center line of the stator tooth, under the influence of the cogging torque, but the electromagnetic torque generated at this position after the energization is also zero, and therefore the motor cannot be started successfully, and this rotor position is called a start dead point. When the motor normally rotates, the motor can smoothly pass through the starting dead point through the inertia of the rotor.

The starting dead point problem is the first problem which restricts the wide application of the single-phase permanent magnet synchronous motor. The most common solution is to change the magnetic conductance distribution of the magnetic circuit, so that the center line of the magnetic pole of the rotor and the center line of the teeth of the stator deviate from a proper angle, and thus the electromagnetic torque of the motor after being electrified can overcome the cogging torque to smoothly start the motor. At present, the solution about the starting dead point at home and abroad is mainly based on the optimization of the motor structure.

In the prior art, a method for adding an auxiliary magnetic pole is adopted. The magnetic poles made of soft magnetic materials are placed in gaps between the stator teeth, so that the position with the maximum magnetic conductance is changed to deviate from the axial position of the stator teeth to the auxiliary magnetic poles by a certain angle, and the electromagnetic torque during starting is enabled to be not zero. However, the motor is additionally provided with the auxiliary magnetic poles, so that the manufacturing difficulty of the motor is increased in the production aspect, and meanwhile, the material cost of the motor is also increased.

Another approach is to use an asymmetric air gap structure, typically by changing the shape of the stator pole pieces. The magnetic permeance of the magnetic circuits with different air gap lengths is different, the shorter the air gap length is, the larger the magnetic permeance of the magnetic circuits is, the distribution of the space air gap permeance can be changed by changing the air gap length so as to obtain an asymmetric air gap structure, and the magnetic pole axis of the motor rotor and the axis of the stator tooth deviate from a certain angle, so that the electromagnetic torque during starting is not zero. Of the most common asymmetric air gap configurations, the tapered air gap configuration minimizes cogging torque while addressing the difficult start-up problem. However, the torque generated by the gradual air gap structure is limited, the starting torque of the motor is small, and the time for accelerating to the synchronous rotating speed is long, so that the application range of the motor is limited.

SUMMERY OF THE UTILITY MODEL

The main object of the utility model is to provide a single-phase PMSM and have its dust catcher to there is the problem of dead point in the motor start among the solution prior art.

In order to achieve the above object, according to an aspect of the present invention, there is provided a single-phase permanent magnet synchronous motor, including: the stator part is provided with a plurality of stator teeth, the plurality of stator teeth enclose a working cavity for accommodating the rotor part, a chamfer structure is arranged at a tooth shoe of at least one of the plurality of stator teeth and is arranged towards the rotor part, and an air gap thickness is formed between the chamfer structure and the rotor part, wherein the plurality of stator teeth comprise a first type of stator teeth and a second type of stator teeth, the tooth shoe of the first type of stator teeth and the tooth shoe of the second type of stator teeth are both provided with the chamfer structure, the air gap thickness formed between the first type of stator teeth and the rotor part is g3, the air gap thickness formed between the second type of stator teeth and the rotor part is g4, wherein g3 is not equal to g 4.

Furthermore, along the rotation direction of the rotor part, a chamfer structure is arranged on the end surface of the rear end of the tooth boot, and an air gap with the thickness gradually reduced along the rotation direction of the rotor part is formed between the chamfer structure and the rotor part.

Further, the beveling structure is a cambered surface structure or a plane structure.

Furthermore, the beveling structure is a plane structure, an included angle phi is formed between a plane where the beveling structure is located and a plane where the tooth bottom surface of the tooth shoe is located, a connecting line of a midpoint of the end surface molded line of the tooth shoe and a vertex of the included angle phi is W, and an included angle alpha is formed between the straight line W and the tooth bottom surface of the tooth shoe, wherein 1.2 alpha < phi <2 alpha.

Further, a distance d is formed between the plane of the beveling structure and the tooth bottom surface of the tooth shoe, wherein 0.1M < d <0.7M, and M is the width of the tooth shoe.

Further, a uniform air gap thickness is formed between the first type of stator teeth and the rotor part, and a uniform air gap thickness is formed between the second type of stator teeth and the rotor part.

Further, a uniform air gap thickness is formed between the first type of stator teeth and the rotor part, and the air gap thickness formed between the second type of stator teeth and the rotor part is gradually reduced along the rotation direction of the rotor part.

Further, the first type of stator teeth are multiple, the second type of stator teeth are multiple, and the multiple first type of stator teeth and the multiple second type of stator teeth are alternately arranged.

Furthermore, the molded line of the end surface of the first type of stator tooth facing the rotor part is a first contour line, and the molded line of the end surface of the second type of stator tooth facing the rotor part is a second contour line, wherein a central angle formed by a connecting line of the first contour line and the junction geometric center of the rotor part is smaller than a central angle formed by a connecting line of the second contour line and the geometric center of the rotor part.

Furthermore, a central angle formed by connecting the geometric center line of the first contour line, the geometric center line of the second contour line and the geometric center of the rotor part is gamma, wherein gamma is less than 2 pi/s, and s is the number of the stator slots.

Furthermore, a geometric center line of the first contour line along the radial direction of the rotor part is taken as a datum line, an offset baseline is taken when the angular deviation is 2 pi/s along the rotation direction of the rotor part, and an offset angle theta is formed between the geometric center line of the second contour line along the radial direction of the rotor part and the offset baseline, wherein theta is a-b, 0.1 pi/p < theta < 0.3 pi/p, p is the pole pair number of the motor, b is a central angle formed by connecting the offset baseline and the end part of the second contour line through which the offset baseline passes and the geometric center of the rotor part, and a is a central angle formed by connecting the rear end of the stator tooth where the offset baseline is located and the offset baseline and the geometric center of the rotor part.

Furthermore, along the rotation direction of the rotor part, grooves are formed in the end faces, facing the rotor part, of the rear ends of the plurality of stator teeth.

Further, a cross section of the groove in a radial direction of the rotor portion is rectangular.

According to the utility model discloses an on the other hand provides a dust catcher, including single-phase PMSM, single-phase PMSM is foretell single-phase PMSM.

Use the technical scheme of the utility model, tooth boots department through at the stator tooth sets up the side cut structure, and make the air gap thickness that forms the motor between the side cut structure that forms and the rotor portion, owing to set up the structure of side cut structure messenger's stator tooth's tip and formed the structure of outside perk, the terminal magnetic conductance of tooth boots diminishes, thereby space air gap magnetic conductance has been changed and has been distributed, make this single-phase PMSM possess asymmetric air gap structure, and make the closed flux linkage of rotor take place the skew when the motor stops, rotor magnetic pole axis no longer coincides with stator tooth axis simultaneously, and the direction of keeping away from terminal outer perk tooth boots has skew certain angle, electromagnetic torque after the motor inserts the electric current is nonzero when this position, possess the self-starting ability. Meanwhile, the structural design of the tail end of the stator tooth shoe warping outwards enables the corresponding asymmetric air gap to further enlarge the deviation angle between the center line of the rotor magnetic pole and the center line of the stator tooth relative to a gradual change type air gap structure, so that the starting torque of the motor is obviously improved, the motor can be applied to occasions with high requirements on the starting torque of the motor, and the application range of the motor is enlarged. On the other hand, the starting torque of the motor is larger, and the time for accelerating the motor from a static state to a synchronous rotating speed is further shortened. The problem that zero exists in the starting of the motor is effectively solved.

Drawings

The accompanying drawings, which form a part of the present application, 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 and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural view of a first embodiment of a single-phase permanent magnet synchronous machine according to the invention;

FIG. 2 shows an enlarged schematic view of the structure at A in FIG. 1;

fig. 3 shows a schematic structural view of a second embodiment of a single-phase permanent magnet synchronous machine according to the invention;

FIG. 4 is an enlarged schematic view of the structure at B in FIG. 3;

fig. 5 shows a schematic structural view of a third embodiment of a single-phase permanent magnet synchronous machine according to the present invention;

FIG. 6 is an enlarged schematic view of the structure at C in FIG. 5;

fig. 7 shows a schematic structural view of a fourth embodiment of a single-phase permanent magnet synchronous machine according to the invention;

fig. 8 shows a schematic structural view of a fifth embodiment of a single-phase permanent magnet synchronous machine according to the present invention;

fig. 9 shows a schematic structural view of a sixth embodiment of a single-phase permanent magnet synchronous machine according to the present invention;

fig. 10 shows a schematic structural diagram of a seventh embodiment of a single-phase permanent magnet synchronous machine according to the present invention.

Wherein the figures include the following reference numerals:

1. arc transition of sharp corners of the tooth shoes; 2. cutting off straight edges; 3. the bottom of each stator tooth is in arc transition at an obtuse angle; 4. arc transition of the tooth shoe obtuse angle; 5. a rotor pole axis; 6. a stator pole axis; 7. cutting the arc section;

10. stator teeth; 11. a tooth boot; 12. a first type of stator teeth; 13. a second type of stator teeth;

20. a rotor portion;

30. a beveling structure;

40. and (4) a groove.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

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 according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.

Referring to fig. 1 to 10, according to an embodiment of the present application, a single-phase permanent magnet synchronous motor is provided.

Specifically, as shown in fig. 1, the single-phase permanent magnet synchronous motor includes a stator portion. The stator part is provided with a plurality of stator teeth 10, the plurality of stator teeth 10 are enclosed to form a working cavity for accommodating the rotor part 20, the tooth shoe 11 of at least one stator tooth 10 in the plurality of stator teeth 10 is provided with a chamfer structure 30, the chamfer structure 30 is arranged towards the rotor part 20, and an air gap thickness is formed between the chamfer structure 30 and the rotor part 20.

In this embodiment, set up the side cut structure through the tooth boots department at the stator tooth, and the air gap thickness that forms the motor between the side cut structure that makes formation and the rotor portion, owing to set up the side cut structure and make the tip of stator tooth form the structure of outside perk, the magnetic conductance at tooth boots end diminishes, thereby space air gap magnetic conductance distribution has been changed, make this single-phase PMSM possess asymmetric air gap structure, and make the closed flux linkage of rotor when the motor stops take place the skew, rotor magnetic pole axis no longer coincides with stator tooth axis simultaneously, and certain angle has been deviated towards the direction of keeping away from terminal outer perk tooth boots, the electromagnetic torque after the motor inserts the electric current is nonzero when this position, possess the self-starting ability. Meanwhile, the structural design of the tail end of the stator tooth shoe warping outwards enables the corresponding asymmetric air gap to further enlarge the deviation angle between the center line of the rotor magnetic pole and the center line of the stator tooth relative to a gradual change type air gap structure, so that the starting torque of the motor is obviously improved, the motor can be applied to occasions with high requirements on the starting torque of the motor, and the application range of the motor is enlarged. On the other hand, the starting torque of the motor is larger, and the time for accelerating the motor from a static state to a synchronous rotating speed is further shortened. The problem that zero exists in the starting of the motor is effectively solved.

As shown by F in fig. 1, the chamfer structure 30 is provided on the end surface of the rear end of the tooth shoe 11 in the rotational direction of the rotor portion 20, and an arrangement is formed between the chamfer structure 30 and the rotor portion 20 in which the thickness of the air gap gradually decreases in the rotational direction of the rotor portion 20. This arrangement can improve the starting capability of the motor. Wherein, the beveling structure 30 is a cambered surface structure or a plane structure. As shown in fig. 2, 1 is an arc transition of a sharp corner of the tooth shoe, 2 is a cutting straight edge, and 3 is an arc transition of an obtuse angle at the bottom of the stator tooth. As shown in fig. 5, 5 is the rotor pole axis and 6 is the stator pole axis. As shown in fig. 6, 7, is a circular arc segment cut.

In this embodiment, as shown in fig. 2, the bevel structure 30 is a planar structure, an included angle Φ is formed between a plane where the bevel structure 30 is located and a plane where the bottom tooth surface of the tooth shoe 11 is located, a connecting line between a midpoint of the end surface profile of the tooth shoe 11 and a vertex of the included angle Φ is W, an included angle α is formed between the straight line W and the bottom tooth surface of the tooth shoe 11, V in fig. 2 is a vertex angle of the included angle formed between the bottom tooth surface and the bevel structure, wherein 1.2 α < Φ <2 α. As shown in fig. 4, the plane of the chamfer structure 30 is at a distance d from the tooth bottom surface of the tooth shoe 11, where 0.1M < d <0.7M, M being the width of the tooth shoe 11. As shown in fig. 7, the number of the stator teeth is plural, and the thicknesses of air gaps formed between the plural stator teeth and the rotor portion are g1 and g 2.

Specifically, the plurality of stator teeth 10 includes a first type of stator teeth 12 and a second type of stator teeth 13. The tooth shoes 11 of the first type of stator teeth 12 and the tooth shoes 11 of the second type of stator teeth 13 are both provided with the chamfered structure 30, and the thickness of the air gap formed between the first type of stator teeth 12 and the rotor portion 20 is g3, and the thickness of the air gap formed between the second type of stator teeth 13 and the rotor portion 20 is g4, wherein g3 ≠ g 4. This arrangement can improve the output torque of the motor rotor.

Preferably, a uniform air gap thickness is formed between the first type of stator teeth 12 and the rotor portion 20, and a uniform air gap thickness is formed between the second type of stator teeth 13 and the rotor portion 20. Of course, as shown in fig. 8, the first type stator teeth 12 and the rotor portion 20 may be formed with a uniform air gap thickness, and the air gap thickness formed between the second type stator teeth 13 and the rotor portion 20 may be gradually decreased along the rotation direction of the rotor portion 20. This arrangement can further improve the output torque of the motor rotor. In the present embodiment, the plurality of first type stator teeth 12 and the plurality of second type stator teeth 13 may be alternately arranged.

Further, as shown in fig. 9, the profile of the end surface of the first type of stator tooth 12 facing the rotor portion 20 is a first profile, and the profile of the end surface of the second type of stator tooth 13 facing the rotor portion 20 is a second profile, wherein a central angle formed by a connecting line between the first profile and the geometric center of the junction of the rotor portion 20 is smaller than a central angle formed by a connecting line between the second profile and the geometric center of the rotor portion 20. And a central angle formed by connecting the geometric center line of the first contour line, the geometric center line of the second contour line and the geometric center of the rotor part 20 is gamma, wherein gamma is less than 2 pi/s, and s is the number of stator slots. The geometric center line of the first contour line along the radial direction of the rotor part 20 is taken as a datum line, an offset baseline is taken when the angle is 2 pi/s along the rotation direction of the rotor part 20, and an offset angle theta is formed between the geometric center line of the second contour line along the radial direction of the rotor part 20 and the offset baseline, wherein theta is a-b, 0.1 pi/p < theta < 0.3 pi/p, p is the pole pair number of the motor, b is a central angle formed by connecting the offset baseline, the end part of the second contour line through which the offset baseline passes and the geometric center of the rotor part 20, and a is a central angle formed by connecting the rear end of the stator tooth where the offset baseline is located, the offset baseline and the geometric center of the rotor part 20. The starting torque of the motor is obviously improved by the arrangement, and the motor starting torque control device can be applied to occasions with high requirements on the starting torque of the motor and can be used for enlarging the application range of the motor.

According to another embodiment of the present application, a groove 40 is opened on an end surface of the rear end of the plurality of stator teeth 10 facing the rotor portion 20 in the rotation direction of the rotor portion 20. The cross section of the groove 40 in the radial direction of the rotor portion 20 is rectangular. The arrangement can also improve the output torque of the motor and eliminate the problem of starting dead points of the motor.

The single-phase PMSM in above-mentioned embodiment can also be used for dust catcher equipment technical field, promptly according to the utility model discloses an on the other hand provides a dust catcher, including single-phase PMSM, single-phase PMSM is the single-phase PMSM in above-mentioned embodiment.

Specifically, adopt the motor structure of this application, this application is the shape of warping outward through revising stator unilateral tooth boots end, and tooth boots constitute asymmetric air gap structure on the spot, solve single-phase permanent magnet synchronous motor and start the difficult problem. Meanwhile, compared with a gradual change type air gap stator tooth structure, the single-phase permanent magnet synchronous motor with the stator tooth structure has larger electromagnetic starting torque, and the acceleration time for achieving synchronous rotating speed is shortened.

The stator tooth shoe tail end outward warping shape is achieved by cutting a single-side part tooth shoe of the stator tooth, the cutting form comprises a linear cutting part tooth shoe based on an upper edge vertex angle of the tooth shoe and an arc cutting part tooth shoe based on a tooth shoe side edge and the bottom of the stator tooth, and the size of a starting angle can be affected by the cutting form and the size of the area of the cutting part, so that the size of the starting torque of the motor is affected.

For linear cutting, the cutting part is cut by taking a vertex angle V on the tooth boot as an initial point and an angle phi as a ray angle, and the angle phi is an included angle between a cutting straight line and the upper side of the tooth boot, so that the structural design of outward warping of the tooth boot is realized. Simultaneously, the cutting line can move downwards in parallel, the moving distance is d, and a proper cutting part can be selected by setting a proper translation distance.

The cutting part can be determined by determining an angle phi and a translation distance d, wherein the angle phi needs to meet the conditions that 1.3 alpha is less than phi <1.5 alpha, and when the translation distance d is more than 0.3M and less than d <0.5M, the area of the linear cutting part is proper, so that the motor has larger starting electromagnetic torque, wherein the value of alpha is changed relative to stators with different sizes, and is defined as the included angle between a straight line determined from the vertex angle of the upper edge of the tooth shoe to the midpoint of the bottom of the stator tooth and the upper edge of the tooth shoe, wherein M is the width of the tooth shoe. For the arc cutting mode, the specific position of arc cutting is obtained by utilizing arc transition of the stator tooth top and the tooth shoe side, wherein the radius of the arc section is preferably the size of the same number of poles according to the size of the stator tooth shoe.

According to one embodiment of the application, the stator is performed on a structure of stator tooth shoes with a uniform air gap. For obtaining the positive starting torque when the motor rotates counterclockwise, the outward warped tooth shoe needs to be located on the right side tooth shoe of the stator tooth. A tooth bottom obtuse angle is generated at the bottom of a stator tooth after a stator tooth shoe is cut off, so that the existence of the bottom obtuse angle is avoided for reducing torque ripples and noise in the running process of a motor, the tooth bottom obtuse angle is replaced by arc section transition, and the radius of the arc section is preferably the same order of magnitude size according to the size of the stator tooth shoe. And when the cutting line moves downwards for a distance of zero, tooth shoe sharp corners are generated on the tooth shoes after cutting, in order to avoid the existence of the tooth shoe sharp corners after cutting the tooth shoes, the magnetic circuit distribution of the motor is improved, the tooth shoe sharp corners are replaced by circular arc section transition, and the radius of the circular arc section is preferably smaller than the size of the stator tooth shoes by a certain number of poles. And when the downward movement distance is not zero, the tooth shoe is cut to generate a certain tooth shoe obtuse angle, the tooth shoe obtuse angle is replaced by circular arc section transition, and the radius of the circular arc section is preferably smaller by a number of poles according to the size of the stator tooth shoe.

In another embodiment according to the present application, the cutting form of the stator tooth shoe outward warping is not limited to a straight line cutting, but may be a cutting form of a circular arc segment, and a specific position of the circular arc cutting is obtained by using circular arc transition of the stator tooth crest and the tooth shoe side, wherein the radius of the circular arc segment is preferably the same number of poles according to the size of the stator tooth shoe. Meanwhile, the sharp corners existing in the process of linear cutting are not needed to be processed, and the arc line cutting can also be moved downwards in parallel, so that the cutting area is modified, and the effect of the technical scheme is not influenced.

According to an embodiment provided by the application, a uniform air gap structure is formed on the basis of a stator, a further improvement is provided, wherein the stator comprises two different stator tooth structures, the two tooth structures correspond to different air gap structures, specifically, the two air gap structures are both uniform air gap (the thickness of an air gap under the same stator tooth is constant), but the thicknesses of the two air gaps are different, namely g1 ≠ g2, and the two different uniform air gaps are alternately distributed in a mode of 1 to 1. Under the condition of keeping the single-side tooth shoe warping structure, the uniform air gaps with different thicknesses are arranged under two different stator teeth, so that the deviation angle between the magnetic pole axis of the motor rotor and the magnetic pole of the stator winding can be further increased, the starting torque is improved, and the starting current is reduced.

Based on a uniform air gap structure, two different stator tooth structures, namely a graded air gap structure and a basic uniform air gap structure are arranged, and the graded air gap and the uniform air gap are alternately distributed in a mode of 1 to 1, in order to obtain the positive starting torque, the thickness of the graded air gap is gradually reduced along the rotation direction of the motor, namely g11< g12.

Adopt the gradual change type air gap also can solve single-phase motor's starting problem, also can further increase the anticlockwise skew angle of motor rotor magnetic pole central line simultaneously, promote motor starting torque, change partial even air gap structure of basis into the gradual change type air gap structure and combine together with the outer perk structure of unilateral tooth boots, can superpose the starting torque who increases the motor, and then reduce starting current.

In another embodiment of the present application, the central angles of two different stator tooth structures facing the rotor part profile are different, which results in different lengths of the stator tooth profiles, wherein the larger central angle is a big tooth, the smaller central angle is a small tooth, the big and small tooth structures are alternately distributed in a 1-to-1 manner, the central angle between the center of the big tooth profile and the center of the small tooth profile is γ, γ <2 pi/s, where s is the number of stator slots. Meanwhile, the geometric center line of the small gear profile is taken as a reference, a straight line which forms 2 pi/s degrees with the geometric center line of the small gear profile is taken as a tooth offset baseline of the big tooth, and the offset angle theta of the big tooth of the motor is set to be a-b. Wherein the value range of theta is more than 0.1 pi/p and less than 0.3 pi/p, and p is the pole pair number of the motor. If the offset angle is too small, the generated starting torque is small, and if the offset angle is too large, the leakage flux between the adjacent stator teeth increases. The problem of single-phase motor start dead center also can be solved to big small tooth skew structure, makes motor rotor magnetic pole axis and stator winding magnetic pole axis simultaneously clockwise skew stator tooth yoke center certain angle, but stator winding magnetic pole axis skew angle is bigger, and then makes the start angle grow of motor. The large and small tooth structures and the single-side tooth shoe outward warping structures are combined together, so that the starting torque of the motor can be increased in a superposed mode, and further the starting current can be reduced.

Further, as shown in fig. 10, the rectangular slotting method specifically includes: the end face of the rear end of each of the 4 stator teeth 10, which faces one side of the rotor part 20, is provided with a groove 40, the grooving part and the tooth shoe outward warping part are located on the same single side of the stator teeth, the distance between the central line of the rectangular groove and the central line of the stator teeth is L, the height of the rectangular groove is H, and the width of the rectangular groove is D. The front end and the rear end of the stator tooth in the application refer to that the end of the stator tooth which firstly turns into the preset point is the front end and the end which turns into the preset point is the rear end along the rotation direction of the rotor part. Stator tooth fluting structure also can solve single-phase motor start dead point problem, combines the outer perk structure of unilateral tooth boots with rectangle fluting structure, can let electric motor rotor magnetic pole axis continue certain angle of anticlockwise skew, can superpose the starting torque who increases the motor, and then reduces starting current.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship 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 of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition to the foregoing, it should be noted that reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally throughout this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

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

Claims (14)

1. A single-phase permanent magnet synchronous motor, comprising:

the stator part is provided with a plurality of stator teeth (10), the plurality of stator teeth (10) are arranged to enclose a working cavity for accommodating a rotor part (20), a chamfer structure (30) is arranged at a tooth shoe (11) of at least one stator tooth (10) in the plurality of stator teeth (10), the chamfer structure (30) is arranged towards the rotor part (20), and an air gap thickness is formed between the chamfer structure (30) and the rotor part (20);

wherein the plurality of stator teeth (10) comprises a first type of stator teeth (12) and a second type of stator teeth (13), wherein the tooth shoes (11) of the first type of stator teeth (12) and the tooth shoes (11) of the second type of stator teeth (13) are both provided with the chamfered structure (30), the thickness of an air gap formed between the first type of stator teeth (12) and the rotor portion (20) is g3, the thickness of an air gap formed between the second type of stator teeth (13) and the rotor portion (20) is g4, wherein g3 ≠ g 4.

2. The single-phase permanent magnet synchronous motor according to claim 1, wherein the chamfered structure (30) is provided on an end surface of a rear end of the tooth shoe (11) in a rotational direction of the rotor portion (20), and an arrangement is formed between the chamfered structure (30) and the rotor portion (20) such that an air gap thickness is gradually reduced in the rotational direction of the rotor portion (20).

3. Single-phase permanent-magnet synchronous machine according to claim 2, characterized in that the chamfer structure (30) is a cambered or planar structure.

4. The single-phase permanent magnet synchronous motor according to claim 1, wherein the bevel structure (30) is a planar structure, the plane of the bevel structure (30) and the plane of the tooth bottom surface of the tooth shoe (11) form an included angle Φ, a connecting line between a midpoint of the end surface profile of the tooth shoe (11) and a vertex of the included angle Φ is W, and an included angle α is formed between a straight line W and the tooth bottom surface of the tooth shoe (11), wherein 1.2 α < Φ <2 α.

5. Single-phase permanent-magnet synchronous machine according to claim 4, characterized in that the plane of the chamfer structure (30) is at a distance d from the tooth bottom surface of the tooth shoe (11), wherein 0.1M < d <0.7M, M being the width of the tooth shoe (11).

6. Single-phase permanent-magnet synchronous machine according to claim 1, characterized in that a uniform air gap thickness is formed between the stator teeth (12) of the first type and the rotor portion (20), and a uniform air gap thickness is formed between the stator teeth (13) of the second type and the rotor portion (20).

7. Single-phase permanent-magnet synchronous machine according to claim 1, characterized in that a uniform air gap thickness is formed between the stator teeth (12) of the first type and the rotor portion (20), the air gap thickness formed between the stator teeth (13) of the second type and the rotor portion (20) being arranged to decrease gradually in the direction of rotation of the rotor portion (20).

8. The single-phase permanent-magnet synchronous machine according to any of claims 1 to 7, characterized in that the stator teeth (12) of the first type are plural, the stator teeth (13) of the second type are plural, and the plural stator teeth (12) of the first type are arranged alternately with the plural stator teeth (13) of the second type.

9. The single-phase permanent magnet synchronous motor according to claim 8, wherein a profile of an end surface of the first type of stator tooth (12) facing the rotor portion (20) is a first profile, and a profile of an end surface of the second type of stator tooth (13) facing the rotor portion (20) is a second profile, wherein a central angle formed by a connecting line of the first profile and a geometric center of a junction of the rotor portion (20) is smaller than a central angle formed by a connecting line of the second profile and the geometric center of the rotor portion (20).

10. The single-phase permanent magnet synchronous motor according to claim 9, wherein a connecting line of the geometric center line of the first contour line, the geometric center line of the second contour line and the geometric center of the rotor portion (20) forms a central angle γ, wherein γ <2 π/s, s is the number of stator slots.

11. The single-phase permanent magnet synchronous motor according to claim 9, wherein a geometric center line of the first contour line in a radial direction of the rotor portion (20) is taken as a reference line, and an offset reference line is taken when an angle of 2 π/s is reached in a rotation direction of the rotor portion (20), a geometric center line of the second contour line in a radial direction of the rotor portion (20) forms an offset angle theta with the offset base line, and a is a central angle formed by connecting the rear end of the stator tooth where the offset base line is located with the offset base line and the geometric center of the rotor part (20).

12. The single-phase permanent magnet synchronous motor according to claim 1, wherein a groove (40) is formed in an end surface of a rear end of the plurality of stator teeth (10) facing the rotor portion (20) in a rotation direction of the rotor portion (20).

13. Single-phase permanent-magnet synchronous machine according to claim 12, characterized in that the cross-section of the groove (40) in the radial direction of the rotor part (20) is rectangular.

14. A vacuum cleaner comprising a single-phase permanent magnet synchronous motor, characterized in that the single-phase permanent magnet synchronous motor is according to any one of claims 1 to 13.

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