CN110912289A

CN110912289A - Single-phase permanent magnet motor and dust collector with same

Info

Publication number: CN110912289A
Application number: CN201911252263.0A
Authority: CN
Inventors: 胡余生; 陈彬; 肖勇; 张志东; 史进飞; 肖胜宇; 李霞; 唐林; 朱绍轩; 桂鹏千; 孙辉; 丁佳婷
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-03-24

Abstract

The invention provides a single-phase permanent magnet motor and a dust collector with the same. The single-phase permanent magnet motor comprises a plurality of stator teeth, the plurality of stator teeth surround an accommodating cavity for accommodating a rotor part, and a notch of a stator slot is formed between tooth boots of adjacent stator teeth; the structure characteristics of at least one notch in the plurality of notches are different from those of the rest notches. By means of setting the notches of the stator slots to different structural characteristics, the problem of dead points existing in motor starting in the prior art is solved, and the starting torque and the output torque of the motor can be improved. Compare with ordinary single-phase permanent-magnet machine, the cogging torque of the motor of this application reduces by a wide margin, and torque ripple descends by a wide margin, and motor starting torque and output torque obtain obviously promoting moreover.

Description

Single-phase permanent magnet motor and dust collector with same

Technical Field

The invention relates to the technical field of motor equipment, in particular to a single-phase permanent magnet motor and a dust collector with the same.

Background

The single-phase motor is a single-phase winding, the number of switching devices required for driving the main circuit is small, and the hardware cost of the control system is low. However, the magnetic field in the single-phase motor is a pulse vibration magnetic field, and the electromagnetic torque of the motor exists in the position of 0 point. If a specific structure is not adopted, the stopping position of the motor is superposed with the point that the electromagnetic torque is 0, and at the moment, no matter any current is introduced, the motor cannot be started, so that the problem of starting dead points exists.

Usually, the single-phase permanent magnet motor adopts unequal air gaps and asymmetric teeth to solve the problem of starting dead points. For example: the single-phase motor disclosed in the patent publication No. CN106849601A adopts a structure with uniform air gaps and gradually changed air gaps, which can increase the cogging torque of the motor while solving the problem of the starting dead point of the motor, resulting in increased output torque ripple of the motor and aggravated generation of motor noise. The single-phase motor disclosed in the patent publication No. CN2504817Y utilizes a notch structure to realize the structure of asymmetric teeth of the stator, and the air gap structure of the stator tooth structure is a uniform air gap structure, but can also solve the starting problem, and simultaneously has a smaller cogging torque compared with an unequal air gap structure, thereby significantly reducing the output torque ripple condition of the motor. However, this structure also has drawbacks: the motor starting torque is small, so that a large starting current is needed when the motor is started.

Disclosure of Invention

The invention mainly aims to provide a single-phase permanent magnet motor and a dust collector with the same, and aims to solve the problem that the motor in the prior art has a starting dead point.

To achieve the above object, according to one aspect of the present invention, there is provided a single-phase permanent magnet motor including: the stator teeth are arranged in a surrounding mode and form an accommodating cavity used for accommodating the rotor part, and notches of the stator slots are formed between tooth boots of the adjacent stator teeth; the rotor part is provided with a plurality of notches, the plurality of notches are arranged along the circumferential direction of the rotor part at intervals, and the width of at least one notch in the plurality of notches is different from the structural characteristics of the rest notches.

Further, the plurality of notches includes: the first type of notches are multiple and are arranged at intervals along the circumferential direction of the rotor part, and the structural characteristics of the first type of notches are identical.

Further, the plurality of notches further comprises: the second type notch is a plurality of, and a plurality of second type notches set up with a plurality of first type notches along rotor portion's circumference in turn, and the structural feature of a plurality of second type notches is the same, and the structural feature of second type notch is different with the structural feature of first type notch, and the number of first type notch is the same with the number of second type notch.

Furthermore, the side walls of the first type of notches are arranged in parallel, and the side walls of the second type of notches are arranged in parallel.

Further, the geometric center of the rotor portion is at a distance L from the geometric centerline of the notch of the first type, where L > 0, or L ═ 0.

Further, when L is 0, the tooth bodies of adjacent stator teeth are symmetrically arranged, and the geometric center line of the first type notch is arranged to be coincident with the symmetry axis of the tooth body of the stator tooth surrounding the first type notch.

Furthermore, the included angle formed by the geometric center lines of any adjacent notches is 2 pi/s, wherein s is the number of the stator slots.

Furthermore, the distance from the geometric center of the rotor part to the geometric center line of the second notch type is L, L is more than 0, and the distance from the geometric center of the rotor part to the geometric center line of the first notch type is 0.

Furthermore, the first type of notches are two, the second type of notches are two, the two first type of notches are oppositely arranged, the geometric center line of at least one of the two first type of notches is arranged to be superposed with the symmetric axis of the tooth body of the adjacent stator tooth, the geometric center lines of the two second type of notches are arranged at a distance from the geometric center of the rotor part, and the geometric center lines of the two second type of notches are respectively positioned on two sides of the geometric center of the rotor part.

Further, the minimum distance from the geometric center line of at least one of the two second notches to the geometric center of the rotor part is D, and the width of at least one of the two first notches is D, wherein D is 0.5D.

Furthermore, D is more than 0 and less than R, D1 is more than or equal to 0.5D, R is the distance from the end face of the stator tooth to the geometric center of the rotor part, and D1 is the width of the second type of notch.

Further, both side walls of each slot pass through the geometric center of the rotor portion in an extension of the rotor portion in the radial direction.

Furthermore, the included angle formed by the two side edges of the first type of notch is theta 1, and the included angle formed by the two side edges of the second type of notch is theta 2, wherein theta 1 is not equal to theta 2.

Furthermore, an angular bisector of an included angle formed by two side edges of at least one of the first type notch and the second type notch is arranged to be superposed with a symmetry axis of a tooth body of the stator tooth enclosing the stator slot.

Further, the geometric center line of the adjacent first type notches forms an included angle theta 3, wherein theta 3 is not equal to 2 pi/s, and/or the geometric center line of the adjacent second type notches forms an included angle theta 4, wherein theta 4 is not equal to 2 pi/s, and/or the geometric center line of the adjacent first type notches and the geometric center line of the second type notches form an included angle theta 5, wherein theta 5 is not equal to 2 pi/s.

Furthermore, 0 < theta 1+ theta 2 < (4 pi/s-2 α), α is the central angle corresponding to the tooth body of the stator tooth.

Furthermore, the included angle formed by the two sides of each notch is theta, wherein, 0 < theta < (2 pi/s- α).

Further, the included angle formed by the geometric center lines of at least one group of adjacent notches in the plurality of notches is theta 6, wherein the theta 6 is not equal to 2 pi/s.

Further, a connecting line between the geometric center of each notch and the geometric center of the rotor portion forms a center line segment, and at least one center line segment of the plurality of notches is arranged to coincide with the symmetry axis of the tooth body of the adjacent stator tooth.

Further, single-phase permanent-magnet machine still includes second type notch, and second type notch is a plurality of, and the structural feature homogeneous phase of a plurality of second type notches is the same, and the structural feature of second type notch is different with the structural feature of first type notch, and the number of second type notch is different with the number of first type notch, is provided with at least one second type notch between the adjacent first type notch.

Further, the single-phase permanent magnet motor also comprises a plurality of second type notches, the structural characteristics of the plurality of second type notches are the same, the structural characteristics of the second type notches are different from those of the first type notches, the plurality of first type notches are adjacently arranged, and the plurality of second type notches are adjacently arranged.

Further, single-phase permanent-magnet machine still includes second type notch, and second type notch is a plurality of, and the structural feature homogeneous phase of a plurality of second type notches, the structural feature of second type notch is different with the structural feature of first type notch, and first groove set is constituteed to two at least second type notches in a plurality of second type notches, and second groove set is constituteed to two at least first type notches in a plurality of first type notches, and first groove set sets up with second groove set alternately.

Further, two side edges of at least one notch in the plurality of notches are arranged in parallel, and the geometric center line of the notch is arranged to be overlapped with the symmetry axis of the tooth body of the adjacent stator tooth.

Further, the plurality of first notches comprise a first notch and a second notch, the plurality of notches further comprise a second notch, the second notch is a plurality of notches, the structural characteristics of the second notches are the same, the structural characteristics of the second notches are different from those of the first notches, the plurality of second notches comprise a third notch and a fourth notch, the first notch, the second notch, the third notch and the fourth notch are sequentially arranged along the circumferential direction of the rotor part, the included angle formed by the central line segment of the first notch and the central line segment of the second notch is gamma 1, the included angle formed by the central line segment of the second notch and the central line segment of the third notch is gamma 3, the included angle formed by the geometric central line segment of the third notch and the geometric central line of the fourth notch is gamma 1, the included angle formed by the geometric central line segment of the fourth notch and the geometric central line of the first notch is gamma 2, wherein gamma 1 is 2 pi/s, gamma 2 is less than 2 pi/s, and gamma 3 is more than 2 pi/s.

Further, the thickness of the air gap formed between the plurality of stator teeth and the rotor portion is the same.

Further, single-phase permanent-magnet machine still includes: the stator yoke portion, a plurality of stator teeth are connected with the stator yoke portion, and the stator yoke portion is closed annular structure, closed square structure or open-ended square structure.

Further, the structural characteristics comprise shape, size and relative position, the tooth body of each stator tooth is uniformly distributed along the circumferential direction of the rotor part, and the plurality of notches are unevenly distributed along the rotor part.

Further, the plurality of notches includes at least three different types of notch configurations.

According to another aspect of the invention, there is provided a vacuum cleaner comprising a single-phase permanent magnet motor as described above.

By applying the technical scheme of the invention, the notch of the stator slot is set to be in different structural characteristics, so that the problem of dead points existing in the motor starting in the prior art is solved, and the starting torque and the output torque of the motor can be improved. Compare with ordinary single-phase permanent-magnet machine, the cogging torque of the motor of this application reduces by a wide margin, and torque ripple descends by a wide margin, and motor starting torque and output torque obtain obviously promoting moreover.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

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

figure 2 shows a schematic structural view of a second embodiment of a single phase permanent magnet machine according to the present invention;

figure 3 shows a schematic structural view of a third embodiment of a single phase permanent magnet machine according to the present invention;

figure 4 shows a schematic structural view of a fourth embodiment of a single phase permanent magnet machine according to the present invention;

figure 5 shows a schematic structural view of a fifth embodiment of a single phase permanent magnet machine according to the present invention;

figure 6 shows a schematic structural view of a sixth embodiment of a single phase permanent magnet machine according to the present invention;

figure 7 shows a schematic structural view of a seventh embodiment of a single phase permanent magnet machine according to the present invention;

figure 8 shows a schematic structural view of an eighth embodiment of a single phase permanent magnet machine according to the present invention;

figure 9 shows a schematic structural view of a ninth embodiment of a single phase permanent magnet machine according to the present invention;

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

Wherein the figures include the following reference numerals:

10. stator teeth; 11. a tooth shoe portion; 12. a tooth body;

20. a rotor portion;

30. a notch; 31. a first type of notch; 311. a first notch; 312. a second notch; 32. a second type of notch; 321. a third notch; 322. a fourth notch;

40. a stator yoke.

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 embodiments with reference to the attached drawings.

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 invention, a single-phase permanent magnet motor is provided.

In particular, a single phase permanent magnet machine comprises stator teeth 10. The stator teeth 10 are plural, the plural stator teeth 10 are enclosed into a housing cavity for housing the rotor portion 20, and the tooth shoes 11 of the adjacent stator teeth 10 form slot openings 30 of the stator slots therebetween. Wherein, notch 30 is a plurality of, and a plurality of notches 30 are arranged along the circumference of rotor portion 20 at intervals, and the width of at least one notch 30 in a plurality of notches 30 is different from the structural characteristics of the rest of notches 30.

In the embodiment, the notch of the stator slot is set to different structural characteristics, so that the problem of dead point of motor starting in the prior art is solved, and the starting torque and the output torque of the motor can be improved. Compare with ordinary single-phase permanent-magnet machine, the cogging torque of the motor of this application reduces by a wide margin, and torque ripple descends by a wide margin, and motor starting torque and output torque obtain obviously promoting moreover. Wherein, the structural characteristics of the notches are different, including different widths, different sizes of the notches, different arrangement positions of the notches and different shapes of the notches. In fig. 1, a is a symmetry axis of a tooth body of a stator tooth, B is a geometric center line at a notch of a stator slot, X is a geometric center line of a rotor in a horizontal direction, and Y is a geometric center line of the rotor in a vertical direction.

In this embodiment, at least two types of slot structures are formed between the tooth shoes of adjacent stator teeth, with different slot structures having different shapes, sizes and relative positions. And each stator tooth body of motor is along rotor portion evenly distributed, and each notch presents unevenly distributed along rotor portion.

As shown in fig. 1 and 2, the plurality of notches 30 includes a first type of notch 31 and a second type of notch 32. The first-type notches 31 are a plurality of notches 31, and a plurality of notches 31 are arranged at intervals along the circumferential direction of the rotor portion 20, and the structural features of the plurality of notches 31 are the same. The second notches 32 are provided in plural, the second notches 32 are alternately arranged with the first notches 31 in plural along the circumferential direction of the rotor portion 20, the structural features of the second notches 32 are the same, the structural features of the second notches 32 are different from those of the first notches 31, and the number of the first notches 31 is the same as that of the second notches 32. In the present embodiment, the side walls of the first type notches 31 are arranged in parallel, and the side walls of the second type notches 32 are arranged in parallel. At this time, the center lines of both sides of each notch are the geometric center lines of the notch. The device can solve the problem of the starting dead point of the single-phase motor, effectively reduce the torque pulsation of the motor and improve the output torque of the motor.

In the embodiment of the present application, the distance from the geometric center of the rotor portion 20 to the geometric centerline of the first-type notch 31 is L, where L > 0, or L ═ 0. This arrangement also serves to eliminate the problem of dead spots in the prior art motor start. The structural characteristics of different types of notches are distinguished by notch width D and notch relative position L, and the difference of one parameter in the two types of notches meeting the notch width D and the notch relative position L is the different types of notches. The width D of the notch is the distance between two side edges of the notch, and D is more than 0. The notch relative position L is a distance from a geometric center of the rotor portion to a geometric center line of the notch.

When L is equal to 0, the tooth bodies 12 of the adjacent stator teeth 10 are symmetrically arranged, and the geometric center line of the first-type notch 31 is arranged to coincide with the symmetry axis of the tooth body 12 of the stator tooth 10 enclosing the first-type notch 31. The symmetry axis of the tooth body is shown as a in fig. 1. The distance from the geometric center of the rotor portion 20 to the geometric center line of the second type notch 32 is L, L > 0, and the distance from the geometric center of the rotor portion 20 to the geometric center line of the first type notch 31 is 0, wherein the geometric center line of the second type notch 32 is shown as B in FIG. 1.

The structural characteristics comprise shape, size and relative position, the tooth bodies of the stator teeth are uniformly distributed along the circumferential direction of the rotor part, and the plurality of notches are non-uniformly distributed along the rotor part. The plurality of notches comprise at least three different types of notch structures by providing notches which are unevenly distributed and the air gap of the stator teeth of the electric machine is a uniform air gap.

According to another embodiment of the present application, when L of the first type of notch is 0, the tooth bodies 12 of the adjacent stator teeth 10 are symmetrically disposed, and the geometric center line of the first type of notch 31 is disposed to coincide with the symmetry axis of the tooth bodies 12 of the stator teeth 10 enclosing the first type of notch 31. The geometric centre lines of any adjacent notches 30 form an included angle of 2 pi/s, where s is the number of stator slots. The arrangement can effectively improve the performance of the motor.

As shown in fig. 2, there are two notches of the first type 31 and two notches of the second type 32. The two first-type notches 31 are oppositely arranged, the geometric center line of at least one of the two first-type notches 31 is arranged to be coincident with the symmetry axis of the tooth body 12 of the adjacent stator tooth 10, the geometric center lines of the two second-type notches 32 are arranged at a distance from the geometric center of the rotor portion 20, and the geometric center lines of the two second-type notches 32 are respectively positioned on both sides of the geometric center of the rotor portion 20. The minimum distance from the geometric center line of the two second notches 32 to the geometric center of the rotor portion 20 is D, and the width of the two first notches 31 is D, wherein D is 0.5D. D is more than 0 and less than R, D is more than or equal to 0.5 and less than D1, R is the distance from the end face of the stator tooth 10 to the geometric center of the rotor part 20, and D1 is the width of the second type of notch 32. The pulse of the motor can be effectively reduced and the output torque of the motor is improved.

The plurality of notches 30 includes at least two types of notches, and the same type of notches are evenly distributed along the rotor portion 20, while the different types of notches are alternately arranged along the rotor portion 20. The number of notches of the different types of notches is equal, n, where n is an integer greater than or equal to 1, and in particular, when a plurality of the notches 30 comprise only two types of notches, it includes: a first type of notch 31 and a second type of notch (32). The notches of the first type 31 and the second type 32 are the same in number and are alternately arranged along the rotor portion 20.

Wherein both side walls of each notch 30 pass the geometric center of rotor portion 20 along the extension line of the radial direction of rotor portion 20. The pulsation of the motor can be further effectively reduced, and the output torque of the motor is improved.

Furthermore, the included angle formed by the two sides of the first type notch 31 is theta 1, the included angle formed by the two sides of the second type notch 32 is theta 2, wherein theta 1 is not equal to theta 2, the arrangement can be used for eliminating the dead point problem of the motor starting in the prior art, wherein 0 & lttheta 1+ theta 2 <, α is the corresponding central angle of the tooth body 12 of the stator tooth 10.

An angular bisector of an included angle formed by two side edges of at least one of the first type notch 31 and the second type notch 32 is arranged to coincide with a symmetry axis of the tooth body 12 of the stator tooth 10 enclosing the stator slot. This arrangement also serves to eliminate the problem of dead spots in the prior art motor start.

The included angle formed by the geometric center lines of the adjacent first type notches 31 is theta 3, wherein theta 3 is not equal to 2 pi/s, the included angle formed by the geometric center lines of the adjacent second type notches 32 is theta 4, wherein theta 4 is not equal to 2 pi/s, the included angle formed by the geometric center lines of the adjacent first type notches 31 and the geometric center lines of the second type notches 32 is theta 5, and theta 5 is not equal to 2 pi/s. This arrangement can improve the performance of the motor.

According to another embodiment of the present application, as shown in fig. 7, the included angle θ between the two side edges of all the slots of the motor is the same, and 0 < θ <, α is the central angle spanned by the tooth body of the stator tooth, in all the adjacent two slots of the motor, the included angle of the angular center line of at least one group of the adjacent slots is not equal to 2 pi/s.

Specifically, a line connecting the geometric center of each notch 30 and the geometric center of the rotor portion 20 forms a center line segment, and at least one center line segment of the plurality of notches 30 is disposed to coincide with the symmetry axis of the tooth body 12 of the adjacent stator tooth 10. The arrangement can eliminate the problem of dead points existing in the starting of the single-phase motor.

Further, the single-phase permanent magnet motor further comprises a second type of notches 32, and the second type of notches 32 are multiple. The structural features of the plurality of second type notches 32 are identical. The structural features of the second type notches 32 are different from those of the first type notches 31, the number of the second type notches 32 is different from that of the first type notches 31, and at least one second type notch 32 is arranged between adjacent first type notches 31. The arrangement can eliminate the problem of dead points existing in the starting of the single-phase motor and effectively improve the output torque of the motor.

According to another embodiment of the present application, the single-phase permanent magnet motor further comprises a second type of notches 32, and the second type of notches 32 are plural. The structural features of the plurality of second type notches 32 are all the same, the structural features of the second type notches 32 are different from the structural features of the first type notches 31, the plurality of first type notches 31 are adjacently disposed, and the plurality of second type notches 32 are adjacently disposed. Alternatively, the first type of notch 31 and the second type of notch 32 may be arranged such that: the second notches 32 are multiple, the structural characteristics of the second notches 32 are the same, the structural characteristics of the second notches 32 are different from those of the first notches 31, at least two second notches 32 in the second notches 32 form a first groove set, at least two first notches 31 in the first notches 31 form a second groove set, and the first groove set and the second groove set are alternately arranged. The arrangement can also eliminate the problem of dead points existing in the starting of the single-phase motor, and effectively improve the output torque of the motor.

Wherein, two sides of at least one notch 30 in the plurality of notches 30 are arranged in parallel, and the geometric center line of the notch 30 is arranged to be superposed with the symmetry axis of the tooth body 12 of the adjacent stator tooth 10.

Specifically, as shown in fig. 8, the plurality of first notches 31 includes a first notch 311 and a second notch 312, the plurality of notches 30 further includes a second notch 32, the second notch 32 is a plurality of notches, structural characteristics of the second notches 32 are the same, structural characteristics of the second notches 32 are different from those of the first notch 31, the plurality of second notches 32 includes a third notch 321 and a fourth notch 322, the first notch 311, the second notch 312, the third notch 321, and the fourth notch 322 are sequentially arranged in the circumferential direction of the rotor portion 20, an included angle formed by a center line segment of the first notch 311 and a center line segment of the second notch 312 is γ 1, an included angle formed by a center line segment of the second notch 312 and a center line segment of the third notch 321 is γ 3, an included angle formed by a geometric center line of the third notch 321 and a geometric center line of the fourth notch 322 is γ 1, an included angle formed by a geometric center line of the fourth notch 322 and a geometric center line of the first notch 311 is γ 2, wherein, gamma 1 is 2 pi/s, gamma 2 is less than 2 pi/s, and gamma 3 is more than 2 pi/s. The arrangement can also eliminate the problem of dead points existing in the starting of the single-phase motor, and effectively improve the output torque of the motor.

In the present embodiment, the thickness of the air gap formed between the plurality of stator teeth 10 and the rotor portion 20 is the same. The motor has the advantages of reducing the torque pulsation of the motor, improving the output torque, reducing the manufacturing difficulty and improving the manufacturing precision due to the structural characteristics of equal air gap thickness.

Further, the single-phase permanent magnet motor further includes a stator yoke 40. The plurality of stator teeth 10 are coupled to a stator yoke 40, the stator yoke 40 being a closed ring feature, a closed square feature, or an open square feature. The motor assembling difficulty can be reduced by the arrangement, and the production efficiency of the motor is improved.

The single-phase permanent magnet motor in the above embodiments may also be used in the technical field of dust collector equipment, that is, according to another aspect of the present invention, there is provided a dust collector, including a single-phase permanent magnet motor, where the single-phase permanent magnet motor is the single-phase permanent magnet motor in the above embodiments.

In particular, in the present application, by providing the motor stator tooth profile with at least two notch features, the different notch features have different shapes, sizes and relative positions. On the circumference distribution, the stator teeth of the motor are uniformly distributed, and the notches formed by the stator teeth of the motor are unevenly distributed. All the notch uneven distributions comprise the mutual matching of the notch number, the notch distribution condition of the same type and the notch shape, and a series of notch uneven distribution structures can be obtained through mutual matching. Wherein, the notch figure can be divided into the equal and unequal circumstances of the slot number of different types of notch of the groove number: the distribution of the notches of the same type can be divided into uniform distribution of the notches of the same type and non-uniform distribution of the notches of the same type. The notch shape includes three notch shape structures, is respectively: 1. two side edges (tooth boot edges of 2 stator teeth) of all notches of the motor are parallel; 2. extension lines of two side edges (tooth boot edges of 2 stator teeth) of all notches of the motor are intersected at the center point of the rotor; 3. the notch has an irregularly shaped or regularly shaped notch, defines a centroid point (or geometric center point) of the notch, and connects the centroid point and the geometric center of the rotor to form a line segment, defined as a center line segment. To different shape notches, further inject notch position relation, can realize the uneven distribution of notch, specifically be: for the notches with two parallel sides or the notches with symmetrical axes (central lines), the relative positions of the notches contained in the motor are as follows: the center line of at least one notch is superposed with the symmetry axis of the tooth bodies of two adjacent stator teeth, and the included angle of the geometric center lines of all two adjacent notches of the motor is 2 pi/s.

For the notch or irregular notch structure with two sides intersecting the geometric center of the rotor, the relative position of each notch contained in the motor is as follows: a. the angular center line or the center line segment of at least one notch is superposed with the symmetry axes of two adjacent stator tooth bodies; b. the central angle between the corner central lines or central line segments of two adjacent notches with the same structure is 2 x pi/s; c. the central angle between the corner central lines or central line segments of two adjacent notches with different structures is not equal to 2 pi/s, and the central angle is less than 2 pi/s and the central angle is more than 2 pi/s.

The problem of single-phase permanent magnet motor starting dead points is solved by arranging the notch structures with uniform air gaps and uneven distribution, and meanwhile, the starting torque of the single-phase permanent magnet motor can be increased relative to the unequal air gaps and the asymmetric tooth structures, and meanwhile, the cogging torque pulsation is not increased, so that the output torque of the motor is increased, and the torque pulsation is reduced. The single-phase permanent magnet motor has only one phase of armature current, the magnetic field generated by the armature winding is a pulse vibration magnetic field, and the electromagnetic torque of the motor has 0 point. The single-phase permanent magnet motor does not adopt a specific structure, and the motor stop position (a point with the cogging torque of 0) is superposed with a point with the electromagnetic torque of 0. No matter the motor stator winding is electrified with any type of current, the single-phase motor can not generate tangential torque, and the single-phase motor can not be started at the moment, so that the problem of starting dead points of the single-phase motor exists. The conventional solution is to provide an asymmetric tooth structure, so that the cogging torque and the electromagnetic torque of the motor are shifted, and the 0 point positions of the two torques are staggered. When the motor stops, the motor stays at the point that the cogging torque is 0, and as long as the electromagnetic torque of the motor is not 0 at the moment, the motor can be started normally.

As shown in fig. 1, the cogging torque 0 point and the electromagnetic torque 0 point of the motor are staggered by providing the notch structure with uneven distribution, and the problem of starting dead points is further solved. The method comprises the following specific steps: the teeth of the stator of the motor form at least two slot configurations, different slot configurations having different shapes, sizes and relative positions. On the circumference distribution, the stator teeth of the motor are uniformly distributed, and the notches formed by the stator teeth of the motor are unevenly distributed.

The uneven distribution of all the notches can be divided into: the same notches are uniformly distributed and the same notches are non-uniformly distributed, all notches can be non-uniformly distributed under the two conditions, the positions of 0 cogging torque and 0 electromagnetic torque are staggered, and the starting dead point is eliminated. The uneven distribution of all the notches can be divided into: the number of the grooves of different notches is the same and the number of the grooves of different notches is different, and the uneven distribution of all the notches can be realized under the two conditions.

On the circumference distribution, all the same notches formed by the stator teeth of the motor are uniformly distributed, and different notch structures 1 are distributed at intervals of 1 to 1. And the number of the grooves of different notches of the motor is equal and is n, wherein n is an integer greater than or equal to 1.

The motor notch structure does: two sides (tooth boot edges of 2 stator teeth) of all notches of the motor are parallel, and the geometric center lines of the two sides are the notch center lines (symmetrical axes). The notch structures are distinguished by utilizing the notch width D and the notch relative position L, and the two notch structures meet the condition that one parameter (D or L) is different, namely the notch structures are different. And for the width of the notch, the width D of two parallel side edges of the motor notch is set, and the width D is larger than 0. And for the relative position of the notch, setting the distance from the center point of the rotor to the center line of the notch to be L, wherein the distance L is more than or equal to 0. For the same type of slot, the distance L from the center point of the rotor to the center line of the slot is equal, and the slot width D is the same.

Further, there is at least one motor slot configuration, the distance from the geometric center point of the rotor to the center line of the slot, which passes through the rotor center point, is equal to 0. At the same time, the motor has at least one notch structure, and the distance from the center point of the rotor to the center line of the notch is not equal to 0, i.e. the center line of the notch does not pass through the center point of the rotor.

For the notch with the notch relative position L being 0, the notch central line is superposed with the tooth body symmetry axis of two adjacent stator teeth. Meanwhile, the included angle of the central lines of all two adjacent notches of the motor is 2 x pi/s. The motor only has two different notch structures, the number of the notches of the motor is 2n, n is an integer which is more than or equal to 1, and the number of the two notch grooves is n respectively.

Preferably, the motor has 4 notches and 2 notch structures, and the notches are arranged as shown in fig. 2, and the center line of the first notch is coincided with the symmetric axis of the adjacent two stator tooth bodies and is coincided with the horizontal center line of the rotor. And the center line of the second notch is parallel to the vertical center line of the rotor. And setting the distance D from one side edge of the second notch to the vertical center line of the rotor to be equal to half of the width D of the first notch, namely D is 0.5X D. The side edges of the second type of notch comprise a left side edge and a right side edge, and different side edges can cause the relative position of the notch of the motor to be changed. As shown in fig. 2 and 3. Wherein, to the notch structure that left side set up D0.5 x D, the motor starts clockwise more easily, and the same reason can be obtained, the notch structure that right side set up, the motor starts anticlockwise more easily. The arrangement of different sides has the capability of eliminating dead points.

According to another embodiment of the present application, as shown in fig. 4, the same slots formed by the teeth of the stator of the electric machine are unevenly distributed in the circumferential distribution, and two different slot arrangements of the electric machine are: the two notches are not arranged in an interpenetration mode, the motor notches integrally comprise two large notch sets, namely each notch set only comprises one notch (1.. 1122.. 2 structures, and 1 and 2 represent two different notches). Further, the relative positions of the slots included in the motor are: the included angle of the central lines of all the adjacent two notches of the motor is 2 pi/s.

According to another embodiment of the present application, as shown in fig. 5, for the same slot distribution and slot number, there is another distribution description and slot number feature, specifically: 1. two different notch arrangement modes of the motor are as follows: two kinds of notches exist and alternate and arrange and also have the notch set simultaneously, and every notch set only contains same kind of notch, and the quantity more than or equal to 2 of the notch of notch set. 2. The number of the notches of the motor is 2n, n is an integer which is more than or equal to 1, and the number of the notches of different notches is unequal. Further, the relative positions of the slots included in the motor are: the included angle of the central lines of all the adjacent two notches of the motor is 2 pi/s.

According to another embodiment of the present application, as shown in fig. 6, the extensions of both sides (tooth shoe sides of 2 stator teeth) of all slots of the motor intersect at the center point of the rotor. On the circumference distribution, all the same notches formed by the stator teeth of the motor are uniformly distributed, and different notch structures 1 are distributed at intervals of 1 to 1. And the number of the grooves of different notches of the motor is equal and is n, wherein n is an integer greater than or equal to 1.

Furthermore, the central line of the notch angle is set as an angular bisector of two side edges of the notch, and the notch structures are distinguished by utilizing the difference of included angles of the two side edges of the notch, namely different notch structures have different included angles of the two side edges. Setting the notch position, specifically: the angular center line of at least one notch is coincident with the symmetry axis of two adjacent stator tooth bodies. In all the two adjacent notches of the motor, the included angle of the angular center lines of at least one group of adjacent notches is not equal to 2 pi/s.

Further, for the motor with only two different slot structures, included angles between two side edges of the two slot structures are respectively theta 1 and theta 2, and theta 1 is not equal to theta 2, as shown in fig. 6, wherein a geometric center line of the first slot is coincident with a symmetric axis of the two stator tooth bodies.

Furthermore, the relationship and the value range of the included angle between the two sides of the second type of notch are set as follows, 0 is more than theta 1+ theta 2 is more than 4 pi/s-2 α, and theta 1 is not equal to theta 2.

According to another embodiment of the present application, as shown in fig. 7, for the notch structure, there is a special notch structure, specifically, the included angle θ between the two side edges of all the notches of the motor is the same, and 0 < θ < 0.5 pi- α. in all the adjacent two notches of the motor, the included angle of the angular center line of at least one group of adjacent notches is not equal to 2 pi/s.

According to another embodiment of the present application, as shown in fig. 8, for the slot distribution (on the circumferential distribution, each identical slot formed by the teeth of the stator of the motor is uniformly distributed, and different slot structures are distributed at intervals of 1 to 1), there is another distribution structure, specifically:

on the circumference distribution, each same notch that motor stator tooth formed presents inhomogeneous distribution, and two kinds of different notch arrangement modes of motor do: two kinds of notches alternate the range each other, and the motor notch is whole to be included two big notch sets, and every notch is concentrated promptly and only contains same kind of notch.

Further, for the above notch distribution arrangement, the corresponding notch positions are designed to: a. the angular center line of at least one notch is superposed with the symmetry axes of two adjacent stator tooth bodies; b. a central angle gamma 1 between the angle central lines of two adjacent notches with the same structure is 2 pi/s; c. the central angle between the angle central lines of two adjacent notches with different structures is not equal to 2 pi/s, meanwhile, the angle with the central angle smaller than 2 pi/s is set as gamma 2, and the angle with the central angle larger than 2 pi/s is set as gamma 3.

According to another embodiment of the present application, as shown in fig. 9, the notch distribution is specifically:

1. two different notch arrangement modes of the motor are as follows: two kinds of notches exist and alternate and arrange and also have the notch set simultaneously, and every notch set only contains same kind of notch, and the quantity more than or equal to 2 of the notch of notch set. 2. The number of the notches of the motor is 2n, n is an integer which is more than or equal to 1, and the number of the notches of different notches is unequal.

According to another embodiment of the present application, as shown in fig. 10, there is also a 3 rd different structural feature description for the motor slot shape, specifically: the notches have irregularly shaped or regularly shaped notches, define the centroid point (or combined centroid point, shown as M in fig. 10, where C is the stator tooth to the shaft) of the notch, and connect the centroid point and the rotor center to form a line segment, defined as the centerline segment. Similarly, the arrangement mode of different notches of the motor can also be that all the same notches formed by the stator teeth of the motor are uniformly distributed on the circumference distribution, and different notch structures 1 are distributed at intervals to 1. Further, the central line segment of at least one notch is coincident with the symmetry axes of two adjacent stator tooth bodies. In all the adjacent two notches of the motor, the included angle of the central line segments of at least one group of adjacent notches is not equal to 2 pi/s.

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

1. A single-phase permanent magnet electric machine, comprising:

the stator teeth (10) are multiple, the stator teeth (10) are surrounded into a containing cavity for containing a rotor part (20), and a notch (30) of a stator slot is formed between tooth boots (11) of the adjacent stator teeth (10);

wherein the notches (30) are multiple, the notches (30) are arranged at intervals along the circumferential direction of the rotor part (20), and the structural characteristics of at least one notch (30) in the notches (30) are different from those of the rest of the notches (30).

2. The single-phase permanent magnet electric machine according to claim 1, wherein the plurality of notches (30) comprises:

the first-type notches (31) are multiple, the first-type notches (31) are arranged at intervals along the circumferential direction of the rotor part (20), and the structural characteristics of the first-type notches (31) are identical.

3. The single-phase permanent magnet electric machine of claim 2, wherein the plurality of slots (30) further comprises:

the number of the second type notches (32) is multiple, the second type notches (32) are alternately arranged with the first type notches (31) along the circumferential direction of the rotor part (20), the structures of the second type notches (32) are the same, the structures of the second type notches (32) are different from the structures of the first type notches (31), and the number of the first type notches (31) is the same as that of the second type notches (32).

4. A single-phase permanent-magnet machine according to claim 3, characterized in that the side walls of the slots of the first type (31) are arranged in parallel and the side walls of the slots of the second type (32) are arranged in parallel.

5. Single-phase permanent-magnet machine according to claim 2, characterized in that the distance of the geometric centre of the rotor part (20) to the geometric centre line of the slot (31) of the first type is L, where L > 0, or L ═ 0.

6. The single-phase permanent magnet machine according to claim 5, characterized in that when the L of a slot of a first type is 0, the tooth bodies (12) of adjacent stator teeth (10) are symmetrically arranged, and the geometric center line of the slot of the first type (31) is arranged to coincide with the symmetry axis of the tooth body (12) of the stator tooth (10) surrounding the slot of the first type (31).

7. A single phase permanent magnet machine according to claim 1, characterized in that the geometrical centre line angle of any adjacent slot opening (30) is 2 pi/s, where s is the number of stator slots.

8. A single-phase permanent-magnet machine according to claim 3, characterized in that the distance from the geometric centre of the rotor portion (20) to the geometric centre line of the notches of the second type (32) is L, L > 0, and the distance from the geometric centre of the rotor portion (20) to the geometric centre line of the notches of the first type (31) is 0.

9. The single-phase permanent magnet motor according to claim 3, wherein the number of the first type notches (31) is two, the number of the second type notches (32) is two, the two first type notches (31) are oppositely arranged, a geometric center line of at least one of the two first type notches (31) is arranged to coincide with a symmetry axis of a tooth body (12) of the adjacent stator tooth (10), a geometric center line of the two second type notches (32) is arranged to have a distance from a geometric center of the rotor portion (20), and the geometric center lines of the two second type notches (32) are respectively located on both sides of the geometric center of the rotor portion (20).

10. Single-phase permanent-magnet electrical machine according to claim 9, characterised in that the smallest distance from the geometric centre line of at least one of the two notches of the second type (32) to the geometric centre of the rotor part (20) is D and the width of at least one of the two notches of the first type (31) is D, where D is 0.5D.

11. The single-phase permanent magnet machine according to claim 9, characterized in that 0 < D < R, 0.5D ≦ D1 < D, R being the distance from the end face of the stator tooth (10) to the geometric center of the rotor part (20), D1 being the width of the slot of the second type (32).

12. Single-phase permanent-magnet machine according to claim 1, characterized in that the two side walls of each slot (30) pass through the geometric center of the rotor part (20) in the extension of the rotor part's (20) radial direction.

13. A single-phase permanent-magnet machine according to claim 3, characterized in that the angle formed by the two sides of the notches of the first type (31) is θ 1 and the angle formed by the two sides of the notches of the second type (32) is θ 2, where θ 1 ≠ θ 2.

14. Single-phase permanent-magnet machine according to claim 13, characterized in that the bisector of the angle formed by the two side edges of at least one of said notches of the first type (31) and said second type (32) is arranged coincident with the axis of symmetry of the tooth body (12) of the stator tooth (10) that encloses the stator slot.

15. The single-phase permanent magnet electric machine of claim 14,

the geometrical centre lines of the adjacent notches (31) of the first type form an included angle theta 3, wherein theta 3 is not equal to 2 pi/s, and/or,

the geometrical centre lines of adjacent notches (32) of the second type form an angle theta 4, where theta 4 ≠ 2 pi/s, and/or,

the included angle formed by the geometric center line of the adjacent first type notch (31) and the geometric center line of the second type notch (32) is theta 5, wherein the theta 5 is not equal to 2 pi/s.

16. The single-phase permanent magnet machine according to claim 13, wherein 0 < θ 1+ θ 2 < (4 π/s-2 α), α is the corresponding central angle of the tooth body (12) of the stator tooth (10).

17. A single-phase permanent-magnet machine according to claim 1, characterized in that the angle formed by the two sides of each slot (30) is θ, where 0 < θ < (2 π/s- α).

18. A single-phase permanent-magnet machine according to claim 1, characterized in that the geometrical centre lines of at least one group of adjacent slots (30) of said plurality of slots (30) form an angle θ 6, where θ 6 ≠ 2 π/s.

19. The single-phase permanent magnet motor according to claim 1 or 18, wherein a line connecting a geometric center of each notch (30) and a geometric center of the rotor portion (20) forms a center line segment, and at least one of the center line segments of the plurality of notches (30) is arranged to coincide with a symmetry axis of a tooth body (12) of an adjacent stator tooth (10).

20. The single-phase permanent magnet machine according to claim 2, further comprising a plurality of notches of a second type (32), wherein the structural characteristics of the plurality of notches of the second type (32) are the same, the structural characteristics of the notches of the second type (32) are different from the structural characteristics of the notches of the first type (31), the number of notches of the second type (32) is different from the number of notches of the first type (31), and at least one notch of the second type (32) is arranged between adjacent notches of the first type (31).

21. The single-phase permanent magnet machine according to claim 2, further comprising a second type of slot (32), wherein the second type of slot (32) is a plurality of slots, wherein the structural features of the second type of slot (32) are the same, wherein the structural features of the second type of slot (32) are different from the structural features of the first type of slot (31), wherein the plurality of first type of slots (31) are adjacently disposed, and wherein the plurality of second type of slots (32) are adjacently disposed.

22. The single-phase permanent magnet machine according to claim 2, further comprising a second type of notches (32), wherein the second type of notches (32) is a plurality of notches, wherein the structural characteristics of the plurality of second type of notches (32) are the same, wherein the structural characteristics of the second type of notches (32) are different from the structural characteristics of the first type of notches (31), wherein at least two second type of notches (32) of the plurality of second type of notches (32) constitute a first set of slots, wherein at least two first type of notches (31) of the plurality of first type of notches (31) constitute a second set of slots, and wherein the first set of slots are arranged alternately with the second set of slots.

23. The single-phase permanent magnet motor according to claim 7, wherein two sides of at least one notch (30) of the plurality of notches (30) are arranged in parallel, and a geometric center line of the notch (30) is arranged to coincide with a symmetry axis of a tooth body (12) of the adjacent stator tooth (10).

24. The single-phase permanent magnet motor according to claim 2, wherein the plurality of notches of the first type (31) includes a first notch (311) and a second notch (312), the plurality of notches (30) further includes a second type (32), the second type (32) is a plurality of notches, structural features of the second type (32) are the same, structural features of the second type (32) are different from those of the first type (31), the plurality of notches of the second type (32) includes a third notch (321) and a fourth notch (322), the first notch (311), the second notch (312), the third notch (321), and the fourth notch (322) are sequentially arranged in a circumferential direction of the rotor portion (20), a center line segment of the first notch (311) forms an angle γ 1 with a center line segment of the second notch (312), the included angle between the central line segment of the second notch (312) and the central line segment of the third notch (321) is gamma 3, the included angle between the geometric central line of the third notch (321) and the geometric central line of the fourth notch (322) is gamma 1, the included angle between the geometric central line of the fourth notch (322) and the geometric central line of the first notch (311) is gamma 2, wherein gamma 1 is 2 pi/s, gamma 2 is less than 2 pi/s, and gamma 3 is more than 2 pi/s.

25. Single-phase permanent-magnet machine according to claim 1, characterized in that the thickness of the air gap formed between the plurality of stator teeth (10) and the rotor portion (20) is the same.

26. The single-phase permanent magnet electric machine of claim 1, further comprising:

the stator comprises a stator yoke portion (40), a plurality of stator teeth (10) are connected with the stator yoke portion (40), and the stator yoke portion (40) is of a closed annular structure, a closed square structure or an open square structure.

27. The single-phase permanent magnet electric machine of claim 3, wherein the structural features include shape, size and relative position, the body of each stator tooth is uniformly distributed along the circumference of the rotor portion, and the plurality of slots are non-uniformly distributed along the rotor portion.

28. The single-phase permanent magnet electric machine of claim 3 wherein the plurality of slots includes at least three different types of slot configurations.

29. A vacuum cleaner comprising a single-phase permanent magnet motor, wherein the single-phase permanent magnet motor is as claimed in any one of claims 1 to 28.