Single-phase permanent magnet motor and vacuum cleaner having the same

Abstract

The present invention provides a single-phase permanent magnet motor and a vacuum cleaner having the same. The single-phase permanent magnet motor includes stator teeth, wherein the stator teeth are multiple, and the multiple stator teeth are arranged to form a receiving cavity for accommodating a rotor part, and a stator slot notch is formed between the tooth boots of adjacent stator teeth; wherein the notches are multiple, and the multiple notches are arranged at intervals along the circumference of the rotor part, and the structural features of at least one of the multiple notches are different from the structural features of the remaining notches. By setting the notches of the stator slots to have different structural features, the problem of dead points in motor starting in the prior art is eliminated, and the starting torque and output torque of the motor can be improved. Compared with ordinary single-phase permanent magnet motors, the tooth slot torque of the motor of the present application is greatly reduced, the torque pulsation is greatly reduced, and the starting torque and output torque of the motor are significantly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motor equipment, and in particular to a single-phase permanent magnet motor and a vacuum cleaner having the same. Background Art

[0002] Single-phase motors have single-phase windings, and require fewer switching devices to drive the main circuit, so the hardware cost of the control system is low. However, the magnetic field inside a single-phase motor is a pulsating magnetic field, and the electromagnetic torque of the motor has a zero point position. If a specific structure is not adopted, the motor's parking position coincides with the point where the electromagnetic torque is 0. At this time, no matter what current is passed, the motor cannot start, so there is a problem of starting dead point.

[0003] Usually, single-phase permanent magnet motors use unequal air gaps and asymmetric teeth to solve the problem of starting dead point. For example, the single-phase motor in the patent with publication number CN106849601A uses a uniform air gap and a gradual air gap structure. This structure will increase the motor's cogging torque while solving the problem of the motor's starting dead point, resulting in an increase in the motor's output torque pulsation and aggravated motor noise. The single-phase motors in the patent with publication number CN2504817Y all use a notch structure to achieve the structure of the stator asymmetric teeth. Although the air gap structure of the stator tooth structure is a uniform air gap structure, it can also solve the starting problem. At the same time, compared with the unequal air gap structure, it has a smaller cogging torque, which significantly reduces the output torque pulsation of the motor. However, this structure also has defects: the motor starting torque is small, so that a larger starting current is required when the motor starts. Summary of the invention

[0004] The main purpose of the present invention is to provide a single-phase permanent magnet motor and a vacuum cleaner having the same, so as to solve the problem of the motor having a starting dead point in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a single-phase permanent magnet motor is provided, comprising: a stator tooth, wherein the stator teeth are multiple, the multiple stator teeth are arranged to form a receiving cavity for receiving a rotor part, and a stator slot is formed between tooth boots of adjacent stator teeth; wherein the multiple slots are multiple, the multiple slots are arranged at intervals along the circumference of the rotor part, and the structural features of at least one of the multiple slots are different from the structural features of the remaining slots.

[0006] Furthermore, the plurality of slots include: a first type of slot, there are a plurality of first type of slots, the plurality of first type of slots are arranged at intervals along the circumference of the rotor part, and the structural features of the plurality of first type of slots are the same.

[0007] Furthermore, the multiple slots also include: second-type slots, there are multiple second-type slots, the multiple second-type slots are alternately arranged with the multiple first-type slots along the circumference of the rotor part, the structural features of the multiple second-type slots are the same, the structural features of the second-type slots are different from the structural features of the first-type slots, and the number of the first-type slots is the same as the number of the second-type slots.

[0008] Furthermore, the side walls of the first type of slots are arranged in parallel, and the side walls of the second type of slots are arranged in parallel.

[0009] Further, the distance from the geometric center of the rotor portion to the geometric center line of the first type of slot is L, wherein L>0, or L=0.

[0010] Further, when L=0, the tooth bodies of adjacent stator teeth are symmetrically arranged, and the geometric center line of the first type of slot is arranged to coincide with the symmetry axis of the tooth body of the stator tooth surrounding the first type of slot.

[0011] Furthermore, the angle formed by the geometric center lines of any adjacent slots is 2π / s, where s is the number of stator slots.

[0012] Furthermore, the distance from the geometric center of the rotor part to the geometric center line of the second type of slot is L, L>0, and the distance from the geometric center of the rotor part to the geometric center line of the first type of slot is 0.

[0013] Furthermore, there are two first-type slots and two second-type slots, the two first-type slots are arranged opposite to each other, the geometric center line of at least one of the two first-type slots is arranged to coincide with the symmetry axis of the tooth body of the adjacent stator tooth, the geometric center lines of the two second-type slots are arranged to have a distance from the geometric center of the rotor part, and the geometric center lines of the two second-type slots are respectively located on both sides of the geometric center of the rotor part.

[0014] Further, the minimum distance from the geometric center line of at least one of the two second-type slots to the geometric center of the rotor part is d, and the width of at least one of the two first-type slots is D, wherein d=0.5D.

[0015] Furthermore, 0<D<R, 0.5D≤D1<D, R is the distance from the end surface of the stator tooth to the geometric center of the rotor part, and D1 is the width of the second type of slot.

[0016] Further, an extension line of two side walls of each slot along the radial direction of the rotor portion passes through the geometric center of the rotor portion.

[0017] Furthermore, the angle formed by the two side edges of the first type of notch is θ1, and the angle formed by the two side edges of the second type of notch is θ2, wherein θ1≠θ2.

[0018] Furthermore, the angle bisector of the angle formed by two side edges of at least one of the first type of slots and the second type of slots is arranged to coincide with the symmetry axis of the tooth body of the stator tooth surrounding the stator slot.

[0019] Further, the angle formed by the geometric center lines of adjacent first-type slots is θ3, wherein θ3≠2π / s, and / or the angle formed by the geometric center lines of adjacent second-type slots is θ4, wherein θ4≠2π / s, and / or the angle formed by the geometric center lines of adjacent first-type slots and second-type slots is θ5, wherein θ5≠2π / s.

[0020] Furthermore, 0<θ1+θ2<(4π / s-2α), where α is the central angle of the tooth body of the stator tooth.

[0021] Furthermore, the angle formed by the two side edges of each notch is θ, wherein 0<θ<(2π / s-α).

[0022] Furthermore, the angle formed by geometric center lines of at least one group of adjacent slots among the plurality of slots is θ6, wherein θ6≠2π / s.

[0023] Furthermore, a line connecting the geometric center of each slot and the geometric center of the rotor portion forms a center line segment, and at least one center line segment of the plurality of slots is arranged to coincide with a symmetry axis of a tooth body of an adjacent stator tooth.

[0024] Furthermore, the single-phase permanent magnet motor also includes a second type of slot, there are multiple second type slots, the structural features of the multiple second type slots are the same, the structural features of the second type slots are different from the structural features of the first type slots, the number of the second type slots is different from the number of the first type slots, and at least one second type slot is arranged between adjacent first type slots.

[0025] Furthermore, the single-phase permanent magnet motor also includes a second type of slot, there are multiple second type slots, the structural features of the multiple second type slots are the same, the structural features of the second type slots are different from the structural features of the first type slots, multiple first type slots are arranged adjacent to each other, and multiple second type slots are arranged adjacent to each other.

[0026] Furthermore, the single-phase permanent magnet motor also includes a second type of slot, there are multiple second type slots, the structural features of the multiple second type slots are the same, the structural features of the second type slots are different from the structural features of the first type slots, at least two of the multiple second type slots form a first slot set, at least two of the multiple first type slots form a second slot set, and the first slot set and the second slot set are arranged alternately.

[0027] Furthermore, two side edges of at least one of the plurality of slots are arranged in parallel, and a geometric center line of the slot is arranged to coincide with a symmetry axis of a tooth body of an adjacent stator tooth.

[0028] Further, the multiple first-type slots include a first slot and a second slot, the multiple slots also include a second-type slot, there are multiple second-type slots, the structural features of the multiple second-type slots are the same, the structural features of the second-type slots are different from the structural features of the first-type slots, the multiple second-type slots include a third slot and a fourth slot, the first slot, the second slot, the third slot and the fourth slot are arranged in sequence along the circumference of the rotor part, the angle formed by the center line segment of the first slot and the center line segment of the second slot is γ1, the angle formed by the center line segment of the second slot and the center line segment of the third slot is γ3, the angle formed by the geometric center line of the third slot and the geometric center line of the fourth slot is γ1, and the angle formed by the geometric center line of the fourth slot and the geometric center line of the first slot is γ2, wherein, γ1=2π / s, γ2<2π / s, γ3>2π / s.

[0029] Furthermore, the thickness of the air gaps formed between the plurality of stator teeth and the rotor portion are all the same.

[0030] Furthermore, the single-phase permanent magnet motor also includes: a stator yoke, a plurality of stator teeth are connected to the stator yoke, and the stator yoke is a closed annular structure, a closed square structure or an open square structure.

[0031] Furthermore, the structural features include shape, size and relative position, the tooth body of each stator tooth is evenly distributed along the circumference of the rotor part, and the plurality of slots are unevenly distributed along the rotor part.

[0032] Furthermore, the plurality of notches include at least three different types of notch structures.

[0033] According to another aspect of the present invention, there is provided a vacuum cleaner, comprising a single-phase permanent magnet motor, wherein the single-phase permanent magnet motor is the single-phase permanent magnet motor described above.

[0034] By applying the technical solution of the present invention, the notch of the stator slot is set to have different structural features, so as to eliminate the problem of dead point in the motor starting in the prior art, and improve the motor starting torque and output torque. Compared with the ordinary single-phase permanent magnet motor, the cogging torque of the motor of the present application is greatly reduced, the torque pulsation is greatly reduced, and the motor starting torque and output torque are significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0036] Figure 1 A schematic structural diagram of a first embodiment of a single-phase permanent magnet motor according to the present invention is shown;

[0037] Figure 2 A schematic structural diagram of a second embodiment of a single-phase permanent magnet motor according to the present invention is shown;

[0038] Figure 3 A schematic structural diagram of a third embodiment of a single-phase permanent magnet motor according to the present invention is shown;

[0039] Figure 4 A schematic structural diagram of a fourth embodiment of a single-phase permanent magnet motor according to the present invention is shown;

[0040] Figure 5 A schematic structural diagram of a fifth embodiment of a single-phase permanent magnet motor according to the present invention is shown;

[0041] Figure 6 A schematic structural diagram of a sixth embodiment of a single-phase permanent magnet motor according to the present invention is shown;

[0042] Figure 7 A schematic structural diagram of a seventh embodiment of a single-phase permanent magnet motor according to the present invention is shown;

[0043] Figure 8 A schematic structural diagram of an eighth embodiment of a single-phase permanent magnet motor according to the present invention is shown;

[0044] Fig. 9 A schematic structural diagram of a ninth embodiment of a single-phase permanent magnet motor according to the present invention is shown;

[0045] Fig.10 A structural schematic diagram of a tenth embodiment of a single-phase permanent magnet motor according to the present invention is shown.

[0046] The above drawings include the following reference numerals:

[0047] 10. stator teeth; 11. tooth boot; 12. tooth body;

[0048] 20. Rotor unit;

[0049] 30, notch; 31, first type notch; 311, first notch; 312, second notch; 32, second type notch; 321, third notch; 322, fourth notch;

[0050] 40. Stator yoke part. DETAILED DESCRIPTION

[0051] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0053] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0054] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0055] Combination Figures 1 to 10 As shown, according to a specific embodiment of the present invention, a single-phase permanent magnet motor is provided.

[0056] Specifically, the single-phase permanent magnet motor includes a stator tooth 10. There are multiple stator teeth 10, and the multiple stator teeth 10 are arranged to form a receiving cavity for receiving the rotor part 20, and a stator slot notch 30 is formed between the tooth shoe parts 11 of adjacent stator teeth 10. There are multiple notches 30, and the multiple notches 30 are arranged at intervals along the circumference of the rotor part 20, and the width of at least one notch 30 among the multiple notches 30 is different from the structural characteristics of the remaining notches 30.

[0057] In this embodiment, by setting the notch of the stator slot to have different structural features, the problem of dead points in motor starting in the prior art is eliminated, and the starting torque and output torque of the motor can be improved. Compared with ordinary single-phase permanent magnet motors, the tooth slot torque of the motor of the present application is greatly reduced, the torque pulsation is greatly reduced, and the starting torque and output torque of the motor are significantly improved. Among them, the different structural features of the notch include different widths and sizes of the notch, different layout positions of the notch, and different shapes of the notch. Among them, in Figure 1 In the figure, A is the symmetry axis of the stator tooth body, B is the geometric center line of the stator slot, X is the geometric center line of the rotor in the horizontal direction, and Y is the geometric center line of the rotor in the vertical direction.

[0058] In this embodiment, at least two types of slot structures are formed between the tooth boots of adjacent stator teeth, and different slot structures have different shapes, sizes and relative positions. The stator teeth of the motor are evenly distributed along the rotor, while the slots are unevenly distributed along the rotor.

[0059] like Figure 1 and Figure 2 As shown, the plurality of slots 30 include a first type slot 31 and a second type slot 32. There are a plurality of first type slots 31, and the plurality of first type slots 31 are arranged at intervals along the circumference of the rotor part 20, and the structural features of the plurality of first type slots 31 are the same. There are a plurality of second type slots 32, and the plurality of second type slots 32 are arranged alternately with the plurality of first type slots 31 along the circumference of the rotor part 20, and the structural features of the plurality of second type slots 32 are the same, and the structural features of the second type slots 32 are different from the structural features of the first type slots 31, and the number of the first type slots 31 is the same as the number of the second type slots 32. Among them, in this embodiment, the side walls of the first type slots 31 are arranged in parallel, and the side walls of the second type slots 32 are arranged in parallel. At this time, the center lines of the two side edges of each slot are the geometric center lines of the slots. Such an arrangement 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.

[0060] In an embodiment of the present application, the distance from the geometric center of the rotor part 20 to the geometric center line of the first type of slot 31 is L, where L>0, or L=0. This arrangement can also eliminate the problem of dead points in motor starting in the prior art. That is, the structural characteristics of different types of slots are distinguished by the slot width D and the slot relative position L. Two types of slots that meet the difference in one parameter of the slot width D and the slot relative position L are different types of slots. The slot width D is the distance between the two sides of the slot, D>0. The slot relative position L refers to the distance from the geometric center of the rotor part to the geometric center line of the slot.

[0061] When L=0, the tooth bodies 12 of adjacent stator teeth 10 are symmetrically arranged, and the geometric center line of the first type of slot 31 is arranged to coincide with the symmetry axis of the tooth body 12 of the stator tooth 10 surrounding the first type of slot 31. The symmetry axis of the tooth body is as follows: Figure 1 As shown in A in FIG. The distance from the geometric center of the rotor portion 20 to the geometric center line of the second type of slot 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 of slot 31 is 0, wherein the geometric center line of the second type of slot 32 is as shown in FIG. Figure 1 As shown in B.

[0062] The structural features include shape, size and relative position, the tooth bodies of the stator teeth are evenly distributed along the circumference of the rotor part, and the plurality of slots are unevenly distributed along the rotor part. The slots are unevenly distributed and the air gap of the motor stator teeth is a uniform air gap, and the plurality of slots include at least three different types of slot structures.

[0063] According to another embodiment of the present application, when L of the first type of slots is 0, the tooth bodies 12 of adjacent stator teeth 10 are symmetrically arranged, and the geometric center line of the first type of slots 31 is arranged to coincide with the symmetry axis of the tooth body 12 of the stator tooth 10 surrounding the first type of slots 31. The angle formed by the geometric center lines of any adjacent slots 30 is 2π / s, where s is the number of stator slots. Such an arrangement can effectively improve the performance of the motor.

[0064] like Figure 2 As shown, there are two first-type slots 31 and two second-type slots 32. The two first-type slots 31 are arranged opposite to each other, and the geometric center line of at least one of the two first-type slots 31 is arranged to coincide with the symmetry axis of the tooth body 12 of the adjacent stator tooth 10, and the geometric center lines of the two second-type slots 32 are arranged to have a distance from the geometric center of the rotor part 20, and the geometric center lines of the two second-type slots 32 are respectively located on both sides of the geometric center of the rotor part 20. The minimum distance from the geometric center line of the two second-type slots 32 to the geometric center of the rotor part 20 is d, and the width of the two first-type slots 31 is D, where d=0.5D. 0<D<R, 0.5D≤D1<D, 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 slot 32. Such an arrangement can effectively reduce the pulsation of the motor and improve the output torque of the motor.

[0065] The plurality of notches 30 include 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. At the same time, the number of notches of different types is equal, which is n, wherein n is an integer greater than or equal to 1. In particular, when the plurality of notches 30 include only two types of notches, they include: a first type of notches 31 and a second type of notches (32). The first type of notches 31 and the second type of notches 32 have the same number of notches and are alternately arranged along the rotor portion 20.

[0066] The extension line of the two side walls of each notch 30 along the radial direction of the rotor part 20 passes through the geometric center of the rotor part 20. This arrangement can further effectively reduce the pulsation of the motor and improve the output torque of the motor.

[0067] Furthermore, the angle formed by the two sides of the first type of slot 31 is θ1, and the angle formed by the two sides of the second type of slot 32 is θ2, wherein θ1≠θ2. This arrangement can eliminate the problem of a dead point in the motor starting in the prior art. Wherein, 0<θ1+θ2<, α is the center angle corresponding to the tooth body 12 of the stator tooth 10.

[0068] The angle bisector of the angle formed by the two sides of at least one of the first type slot 31 and the second type slot 32 is arranged to coincide with the symmetry axis of the tooth body 12 of the stator tooth 10 surrounding the stator slot. This arrangement can also eliminate the problem of dead points in motor starting in the prior art.

[0069] The angle formed by the geometric center lines of the adjacent first-type slots 31 is θ3, where θ3≠2π / s, the angle formed by the geometric center lines of the adjacent second-type slots 32 is θ4, where θ4≠2π / s, and the angle formed by the geometric center lines of the adjacent first-type slots 31 and the second-type slots 32 is θ5, where θ5≠2π / s. This arrangement can improve the performance of the motor.

[0070] According to another embodiment of the present application, Figure 7 As shown, the angle θ of the two sides of all the slots of the motor is the same, and 0<θ<, α is the center angle of the stator tooth body. Among all two adjacent slots of the motor, there is at least one set of adjacent slots whose angle of the angular center line is not equal to 2π / s. At this time, all the slots of the motor are the same type of slots, but they are unevenly distributed on the circumference, so the problem of dead points in the starting of single-phase motors can still be eliminated. Among them, the angular center line is the geometric center line of the slot along the radial direction.

[0071] Specifically, the line connecting the geometric center of each slot 30 and the geometric center of the rotor part 20 forms a center line segment, and at least one center line segment of the plurality of slots 30 is arranged to coincide with the symmetry axis of the tooth body 12 of the adjacent stator tooth 10. This arrangement can eliminate the problem of a dead point when starting a single-phase motor.

[0072] Further, the single-phase permanent magnet motor further includes a second type of slot 32, and the second type of slot 32 is multiple. The structural features of the multiple second type of slots 32 are the same. The structural features of the second type of slots 32 are different from the structural features of the first type of slots 31, the number of the second type of slots 32 is different from the number of the first type of slots 31, and at least one second type of slot 32 is arranged between adjacent first type of slots 31. Such an arrangement can eliminate the problem of a dead point at the start of the single-phase motor and effectively improve the output torque of the motor.

[0073] According to another embodiment of the present application, the single-phase permanent magnet motor further includes a second type of slot 32, and the second type of slot 32 is multiple. The structural features of the multiple second type of slots 32 are the same, the structural features of the second type of slots 32 are different from the structural features of the first type of slots 31, the multiple first type of slots 31 are arranged adjacent to each other, and the multiple second type of slots 32 are arranged adjacent to each other. Alternatively, the first type of slot 31 and the second type of slot 32 can be arranged as follows: the second type of slot 32 is multiple, the structural features of the multiple second type of slots 32 are the same, the structural features of the second type of slots 32 are different from the structural features of the first type of slots 31, at least two of the multiple second type of slots 32 form a first slot set, at least two of the multiple first type of slots 31 form a second slot set, and the first slot set and the second slot set are arranged alternately. Such an arrangement can also eliminate the problem of dead points at the start of the single-phase motor and effectively improve the output torque of the motor.

[0074] The two sides of at least one slot 30 among the plurality of slots 30 are arranged in parallel, and the geometric center line of the slot 30 is arranged to coincide with the symmetry axis of the tooth body 12 of the adjacent stator tooth 10 .

[0075] Specifically, Figure 8As shown, the plurality of first-type slots 31 include a first slot 311 and a second slot 312, the plurality of slots 30 also include a second-type slot 32, the second-type slots 32 are multiple, the structural features of the plurality of second-type slots 32 are the same, the structural features of the second-type slots 32 are different from the structural features of the first-type slots 31, the plurality of second-type slots 32 include a third slot 321 and a fourth slot 322, the first slot 311, the second slot 312, the third slot 321 and the fourth slot 322 are arranged along the circumference of the rotor portion 20 The angle formed by the center line segment of the first slot 311 and the center line segment of the second slot 312 is γ1, the angle formed by the center line segment of the second slot 312 and the center line segment of the third slot 321 is γ3, the angle formed by the geometric center line of the third slot 321 and the geometric center line of the fourth slot 322 is γ1, and the angle formed by the geometric center line of the fourth slot 322 and the geometric center line of the first slot 311 is γ2, wherein γ1=2π / s, γ2<2π / s, γ3>2π / s. This arrangement can also eliminate the problem of dead points in the starting of single-phase motors and effectively improve the output torque of the motors.

[0076] In this embodiment, the thickness of the air gaps formed between the plurality of stator teeth 10 and the rotor part 20 are all the same. The structural feature of the equal air gap thickness reduces the torque pulsation of the motor, improves the output torque, reduces the manufacturing difficulty, and improves the manufacturing accuracy.

[0077] Furthermore, the single-phase permanent magnet motor further includes a stator yoke 40. A plurality of stator teeth 10 are connected to the stator yoke 40, and the stator yoke 40 is a closed annular structure feature, a closed square structure feature, or an open square structure feature. Such a configuration can reduce the difficulty of motor assembly and improve the production efficiency of the motor.

[0078] The single-phase permanent magnet motor in the above embodiment can also be used in the technical field of vacuum cleaner equipment. That is, according to another aspect of the present invention, a vacuum cleaner is provided, including a single-phase permanent magnet motor, which is the single-phase permanent magnet motor in the above embodiment.

[0079] Specifically, in the present application, by setting the motor stator tooth shape to at least two slot structure features, different slot structure features have different shapes, sizes and relative positions. In terms of circumferential distribution, the stator teeth of the motor are evenly distributed, while the slots formed by the stator teeth of the motor are unevenly distributed. All uneven distribution of slots includes the mutual coordination of the number of slots, the distribution of the same type of slots and the shape of the slots. A series of uneven distribution structures of slots can be obtained through mutual coordination. Among them, the number of slots can be divided into the cases where the number of slots of different types of slots is equal and the number of slots of different types of slots is unequal: for the same type of slot distribution, it can be divided into the same type of slot uniform distribution and the same type of slot uneven distribution. The slot shape includes three slot shape structures, namely: 1. The two sides of all slots of the motor (the tooth shoe sides of two stator teeth) are parallel; 2. The extension lines of the two sides of all slots of the motor (the tooth shoe sides of two stator teeth) intersect at the center point of the rotor; 3. The slot has an irregular shape or a regular shape, the centroid point (or geometric center point) of the slot is determined, and the centroid point and the geometric center of the rotor are connected to form a line segment, which is defined as the center line segment. For slots of different shapes, the position relationship of the slots is further defined, and the uneven distribution of the slots can be achieved. Specifically, for slots with parallel two sides of the slot or slots with a symmetry axis (center line), the relative positions of the slots contained in the motor are: at least one of the center lines of the slots coincides with the symmetry axis of the tooth body of two adjacent stator teeth, and at the same time, the angle between the geometric center lines of all two adjacent slots of the motor is 2π / s.

[0080] For slots or irregular slot structures whose two side edges intersect at the geometric center point of the rotor, the relative positions of the slots contained in the motor are: a. The angular center line or center line segment of at least one slot coincides with the symmetry axis of two adjacent stator tooth bodies; b. The center angle between the angular center lines or center line segments of two adjacent slots with the same structure is 2*π / s; c. The center angle between the angular center lines or center line segments of two adjacent slots with different structures is not equal to 2π / s, and it is assumed that the center angle is less than 2π / s, and the center angle is greater than 2π / s.

[0081] The problem of starting dead point of single-phase permanent magnet motor is solved by setting uniform air gap and unevenly distributed notch structure. At the same time, compared with unequal air gap and asymmetric tooth structure, the starting torque of single-phase permanent magnet motor can be increased without increasing cogging torque pulsation, so that the motor increases output torque and reduces torque pulsation. Since the armature current of single-phase permanent magnet motor has only one phase, the magnetic field generated by the armature winding is a pulsating magnetic field, and the electromagnetic torque of the motor has a 0 point. Single-phase permanent magnet motor does not adopt a specific structure, and the motor parking position (the point where the cogging torque is 0) coincides with the point where the electromagnetic torque is 0. Regardless of any form of current passed through the stator winding of the motor, the single-phase motor cannot generate tangential torque, and the single-phase motor cannot start at this time, so the single-phase motor has the problem of starting dead point. The usual solution is to set an asymmetric tooth structure to offset the cogging torque and electromagnetic torque of the motor, so that the 0 point positions of the two torques are staggered. When the motor stops, it stays at the point where the cogging torque is 0. As long as the electromagnetic torque of the motor is not 0 at this time, the motor can start normally.

[0082] like Figure 1 As shown, by setting an unevenly distributed notch structure, the motor's tooth slot torque 0 point is staggered with the electromagnetic torque 0 point, thereby eliminating the starting dead point problem. Specifically, the motor stator teeth form at least two notch structures, and different notch structures have different shapes, sizes and relative positions. In terms of circumferential distribution, the motor stator teeth are evenly distributed, while the notches formed by the motor stator teeth are unevenly distributed.

[0083] The uneven distribution of all slots can be divided into: uniform distribution of the same slots and uneven distribution of the same slots. Both cases can achieve uneven distribution of all slots, thereby staggering the positions of 0 tooth slot torque and 0 electromagnetic torque to eliminate the starting dead point. The uneven distribution of all slots can be divided into: the number of slots of different slots is the same and the number of slots of different slots is different. Both cases can also achieve uneven distribution of all slots.

[0084] In the circumferential distribution, the same slots formed by the motor stator teeth are evenly distributed, and different slot structures are distributed in a 1 to 1 interval. At the same time, the number of slots of different slots of the motor is equal, which is n, where n is an integer greater than or equal to 1.

[0085] The motor slot structure is: the two sides of all the slots of the motor (the tooth shoe sides of the two stator teeth) are parallel, and the geometric center line of the two sides is the slot center line (symmetry axis). The slot width D and the slot relative position L are used to distinguish the slot structure. Two slot structures are different if one of the parameters (D or L) is different. For the slot width, it is set to the width D of the two parallel sides of the motor slot, and the width D is greater than 0. For the relative position of the slot, the distance from the center point of the rotor to the center line of the slot is set to L, and the distance L is greater than or equal to 0. For the same 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.

[0086] Furthermore, there is at least one slot structure of the motor, where the distance from the geometric center point of the rotor to the center line of the slot is equal to 0, and the center line of the slot passes through the center point of the rotor. At the same time, there is at least one slot structure of the motor, where the distance from the center point of the rotor to the center line of the slot is not equal to 0, that is, the center line of the slot does not pass through the center point of the rotor.

[0087] For the slot whose relative position L is 0, the center line of the slot coincides with the tooth body symmetry axis of two adjacent stator teeth. At the same time, the angle between the center lines of all two adjacent slots of the motor is 2*π / s. There are only two different slot structures in the motor, and the number of slots in the motor is 2n, where n is an integer greater than or equal to 1, and the number of slots of the two slots is n each.

[0088] Preferably, the motor has 4 slots and 2 slot structures, such as Figure 2 In the arrangement shown, the center line of the first type of slot coincides with the axis of symmetry of the two adjacent stator teeth, and also coincides with the horizontal center line of the rotor. At this time, the center line of the second type of slot is parallel to the vertical center line of the rotor. The distance d from one side of the second type of slot to the vertical center line of the rotor is set to be equal to half of the width D of the first type of slot, that is, d = 0.5*D. The sides of the second type of slot include left and right sides, and different sides will cause the relative position of the motor slot to change. Figure 2 , Figure 3 As shown. For the notch structure with d=0.5*D set on the left side, the motor is easier to start clockwise. Similarly, for the notch structure set on the right side, the motor is easier to start counterclockwise. The settings of different sides have the ability to eliminate dead spots.

[0089] According to another embodiment of the present application, Figure 4As shown, in the circumferential distribution, the same slots formed by the motor stator teeth are unevenly distributed, and the two different slot arrangements of the motor are as follows: the two slots are not interlaced with each other, and the motor slots as a whole include two large slot sets, that is, each slot set contains only the same type of slots (1...1122...2 structure, 1 and 2 represent two different slots). Furthermore, the relative positions of the slots contained in the motor are as follows: the angle between the center lines of all two adjacent slots of the motor is 2π / s.

[0090] According to another embodiment of the present application, Figure 5 As shown, for the same slot distribution and slot number, there is another distribution description and slot number characteristics, specifically: 1. The two different slot arrangements of the motor are: there are two slots interlaced and there are also slot sets, each slot set contains only the same slot, and the number of slots in the slot set is greater than or equal to 2. 2. The number of slots in the motor is 2n, n is an integer greater than or equal to 1, and the number of slots in different slots is not equal. Furthermore, the relative positions of the slots contained in the motor are: the angle between the center lines of all two adjacent slots of the motor is 2π / s.

[0091] According to another embodiment of the present application, Figure 6 As shown in the figure, the extension lines of both sides of all the slots of the motor (the tooth shoe sides of the two stator teeth) intersect at the center point of the rotor. In the circumferential distribution, the same slots formed by the stator teeth of the motor are evenly distributed, and the different slot structures are distributed in a 1-to-1 interval. At the same time, the number of slots of different slots of the motor is equal, which is n, where n is an integer greater than or equal to 1.

[0092] Furthermore, the slot angle centerline is set as the angle bisector of the two sides of the slot, and the slot structure is distinguished by the difference in the angle between the two sides of the slot, that is, different slot structures have different angles between the two sides. The slot position is set, specifically: at least one slot has an angle centerline that coincides with the symmetry axis of two adjacent stator teeth. Among all two adjacent slots of the motor, at least one group of adjacent slots has an angle between the angle centerlines that is not equal to 2π / s.

[0093] Furthermore, there are only two different slot structures for the motor, and the angles of the two sides are θ1 and θ2 respectively, and θ1≠θ2, such as Figure 6 As shown, the geometric center line of the first type of slot coincides with the symmetry axis of the two stator tooth bodies.

[0094] Furthermore, the angle relationship and value range of the two side edges of the second type of notch are set as follows: 0<θ1+θ2<4*π / s-2α, θ1≠θ2.

[0095] According to another embodiment of the present application, Figure 7As shown, for the slot structure, there is a special slot structure, specifically: the angle θ of the two sides of all the slots of the motor is the same, and 0<θ<0.5π-α. Among all two adjacent slots of the motor, there is at least one set of adjacent slots whose angular centerline angle is not equal to 2π / s. At this time, all the slots of the motor are the same type of slots, but they are non-uniformly distributed on the circumference, so the problem of dead points in the starting of single-phase motors can still be eliminated.

[0096] According to another embodiment of the present application, Figure 8 As shown, for the slot distribution mode (in the circumferential distribution, the same slots formed by the motor stator teeth are evenly distributed, and different slot structures are distributed in a 1-to-1 interval), there is another distribution structure, specifically:

[0097] In terms of circumferential distribution, the identical slots formed by the motor stator teeth are unevenly distributed. The two different slot arrangements of the motor are as follows: the two slots are not arranged interlaced with each other, and the motor slots as a whole include two large slot sets, that is, each slot set contains only the same type of slots.

[0098] Furthermore, for the above-mentioned slot distribution setting, the corresponding slot positions are designed as follows: a. The angular center line of at least one slot coincides with the symmetry axis of two adjacent stator tooth bodies; b. The central angle γ1=2π / s included by the angular center lines of two adjacent slots of the same structure; c. The central angle included by the angular center lines of two adjacent slots of different structures is not equal to 2π / s, and at the same time, the angle whose central angle is less than 2π / s is γ2, and the angle whose central angle is greater than 2π / s is γ3.

[0099] According to another embodiment of the present application, Fig. 9 As shown, the specific slot distribution method is as follows:

[0100] 1. Two different slot arrangements of the motor are: there are two slots in an interlaced arrangement and there are also slot sets, each slot set contains only the same type of slots, and the number of slots in the slot set is greater than or equal to 2. 2. The number of slots of the motor is 2n, n is an integer greater than or equal to 1, and the number of slots of different slots is not equal.

[0101] Furthermore, for the above-mentioned slot distribution setting, the corresponding slot positions are designed as follows: a. The angular center line of at least one slot coincides with the symmetry axis of two adjacent stator tooth bodies; b. The central angle γ1=2π / s included by the angular center lines of two adjacent slots of the same structure; c. The central angle included by the angular center lines of two adjacent slots of different structures is not equal to 2π / s, and at the same time, the angle whose central angle is less than 2π / s is γ2, and the angle whose central angle is greater than 2π / s is γ3.

[0102] According to another embodiment of the present application, Fig.10As shown, there is a third different structural feature description for the shape of the motor slot, specifically: the slot has an irregular shape or a regular shape, and the centroid point of the slot is determined (or combined with the center point, such as Fig.10 As shown in M, where C is the stator tooth relative to the axis), and the centroid point and the rotor center are connected to form a line segment, which is defined as the center line segment. Similarly, the arrangement of different slots of the motor can also be: in the circumferential distribution, the same slots formed by the stator teeth of the motor are evenly distributed, and different slot structures are distributed 1 to 1. Furthermore, there is at least one slot whose center line segment coincides with the symmetry axis of two adjacent stator tooth bodies. Among all two adjacent slots of the motor, there is at least one set of adjacent slots whose center line segments have an angle that is not equal to 2π / s.

[0103] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0104] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0105] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0106] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A single-phase permanent magnet motor, characterized in that: include: Stator teeth (10), the stator teeth (10) being multiple, the multiple stator teeth (10) being arranged to form a receiving cavity for receiving a rotor portion (20), and stator slot notches (30) being formed between tooth shoe portions (11) of adjacent stator teeth (10); There are a plurality of the slots (30), the plurality of the slots (30) are arranged at intervals along the circumferential direction of the rotor part (20), and the structural features of at least one of the plurality of slots (30) are different from the structural features of the remaining slots (30); The plurality of notches (30) include: a first type of notches (31), the first type of notches (31) being multiple, the multiple first type of notches (31) being arranged at intervals along the circumferential direction of the rotor part (20), and the multiple first type of notches (31) having the same structural features; a second type of slot (32), wherein the second type of slot (32) is multiple, the multiple second type of slots (32) are arranged alternately with the multiple first type of slots (31) along the circumferential direction of the rotor portion (20), the multiple second type of slots (32) have the same structure, the structure of the second type of slot (32) is different from the structure of the first type of slot (31), and the number of the first type of slot (31) is the same as the number of the second type of slot (32); There are two first-type slots (31) and two second-type slots (32), the two first-type slots (31) are arranged opposite to each other, the geometric center line of at least one of the two first-type slots (31) is arranged to coincide with the symmetry axis of the tooth body (12) of the adjacent stator tooth (10), the geometric center lines of the two second-type slots (32) are arranged to have a distance from the geometric center of the rotor part (20), and the geometric center lines of the two second-type slots (32) are respectively located on both sides of the geometric center of the rotor part (20); The minimum distance from the geometric center line of at least one of the two second-type slots (32) to the geometric center of the rotor part (20) is d, and the width of at least one of the two first-type slots (31) is D, where d=0.5D.

2. The single-phase permanent magnet motor according to claim 1, characterized in that: The side walls of the first type of slots (31) are arranged in parallel, and the side walls of the second type of slots (32) are arranged in parallel.

3. The single-phase permanent magnet motor according to claim 1, characterized in that: The distance from the geometric center of the rotor part (20) to the geometric center line of the first type of slot (31) is L, wherein L>0, or L=0.

4. The single-phase permanent magnet motor according to claim 3, characterized in that: When L of the first type of slots is 0, the tooth bodies (12) of adjacent stator teeth (10) are symmetrically arranged, and the geometric center line of the first type of slots (31) is arranged to coincide with the symmetry axis of the tooth bodies (12) of the stator teeth (10) that surround the first type of slots (31).

5. The single-phase permanent magnet motor according to claim 1, characterized in that: The geometric center line angle of any adjacent slots (30) is 2π / s, where s is the number of stator slots.

6. The single-phase permanent magnet motor according to claim 1, characterized in that: The distance from the geometric center of the rotor part (20) to the geometric center line of the second type of slot (32) is L, L>0, and the distance from the geometric center of the rotor part (20) to the geometric center line of the first type of slot (31) is 0.

7. The single-phase permanent magnet motor according to claim 6, characterized in that: 0<D<R, 0.5D≤D1<D, R is the distance from the end surface 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).

8. The single-phase permanent magnet motor according to claim 1, characterized in that: An extension line of two side walls of each of the slots (30) in the radial direction of the rotor part (20) passes through the geometric center of the rotor part (20).

9. The single-phase permanent magnet motor according to claim 1, characterized in that: The angle formed by the two side edges of the first type of notch (31) is θ1, and the angle formed by the two side edges of the second type of notch (32) is θ2, wherein θ1≠θ2.

10. The single-phase permanent magnet motor according to claim 9, characterized in that: The angular bisector of the angle formed by the two side edges of at least one of the first type of slot (31) and the second type of slot (32) is arranged to coincide with the symmetry axis of the tooth body (12) of the stator tooth (10) that encloses the stator slot.

11. The single-phase permanent magnet motor according to claim 10, characterized in that: The angle formed by the geometric center lines of adjacent first-type notches (31) is θ3, wherein θ3≠2π / s, and / or, The angle formed by the geometric center lines of adjacent second-type notches (32) is θ4, wherein θ4≠2π / s, and / or, The angle formed by the geometric center line of the adjacent first-type slots (31) and the geometric center line of the second-type slots (32) is θ5, where θ5≠2π / s.

12. The single-phase permanent magnet motor according to claim 8, characterized in that: 0<θ1+θ2<(4π / s-2α), α is the center angle corresponding to the tooth body (12) of the stator tooth (10).

13. The single-phase permanent magnet motor according to claim 1, characterized in that: The included angle formed by the two side edges of each of the notches (30) is θ, wherein 0<θ<(2π / s-α).

14. The single-phase permanent magnet motor according to claim 1, characterized in that: The angle formed by the geometric center lines of at least one group of adjacent slots (30) among the plurality of slots (30) is θ6, wherein θ6≠2π / s.

15. The single-phase permanent magnet motor according to claim 1 or 14, characterized in that: A line connecting the geometric center of each slot (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 slots (30) is arranged to coincide with the symmetry axis of the tooth body (12) of the adjacent stator tooth (10).

16. The single-phase permanent magnet motor according to claim 1, characterized in that: The single-phase permanent magnet motor further comprises a second type of slot (32), the second type of slot (32) being multiple, the multiple second type of slots (32) having the same structural features, the structural features of the second type of slot (32) being different from the structural features of the first type of slot (31), the number of the second type of slot (32) being different from the number of the first type of slot (31), and at least one second type of slot (32) being arranged between adjacent first type of slots (31).

17. The single-phase permanent magnet motor according to claim 1, characterized in that: The single-phase permanent magnet motor further comprises a second type of slot (32), wherein the second type of slot (32) is multiple, the structural features of the multiple second type of slots (32) are the same, the structural features of the second type of slot (32) are different from the structural features of the first type of slot (31), the multiple first type of slots (31) are adjacently arranged, and the multiple second type of slots (32) are adjacently arranged.

18. The single-phase permanent magnet motor according to claim 1, characterized in that: The single-phase permanent magnet motor further comprises a second type of slot (32), wherein the second type of slot (32) is multiple, the structural features of the multiple second type of slots (32) are all the same, the structural features of the second type of slot (32) are different from the structural features of the first type of slot (31), at least two of the multiple second type of slots (32) form a first slot set, and at least two of the multiple first type of slots (31) form a second slot set, and the first slot set and the second slot set are arranged alternately.

19. The single-phase permanent magnet motor according to claim 3, characterized in that: The two side edges of at least one of the plurality of slots (30) are arranged in parallel, and the geometric center line of the slot (30) is arranged to coincide with the symmetry axis of the tooth body (12) of the adjacent stator tooth (10).

20. The single-phase permanent magnet motor according to claim 1, characterized in that: The plurality of first-type slots (31) include a first slot (311) and a second slot (312); the plurality of slots (30) further include a second-type slot (32); the second-type slots (32) are multiple; the structural features of the plurality of second-type slots (32) are the same; the structural features of the second-type slots (32) are different from the structural features of the first-type slots (31); the plurality of second-type slots (32) include a third slot (321) and a fourth slot (322); the first slot (311), the second slot (312), the third slot (321) and the fourth slot (322) are arranged along The rotor part (20) is arranged in sequence in the circumferential direction, the angle formed by the center line segment of the first slot (311) and the center line segment of the second slot (312) is γ1, the angle formed by the center line segment of the second slot (312) and the center line segment of the third slot (321) is γ3, the angle formed by the geometric center line of the third slot (321) and the geometric center line of the fourth slot (322) is γ1, and the angle formed by the geometric center line of the fourth slot (322) and the geometric center line of the first slot (311) is γ2, wherein γ1=2π / s, γ2<2π / s, and γ3>2π / s.

21. The single-phase permanent magnet motor according to claim 1, characterized in that: The thickness of the air gaps formed between the plurality of stator teeth (10) and the rotor part (20) are all the same.

22. The single-phase permanent magnet motor according to claim 1, characterized in that: The single-phase permanent magnet motor also includes: A stator yoke (40), wherein a plurality of stator teeth (10) are connected to the stator yoke (40), and the stator yoke (40) is a closed annular structure, a closed square structure, or an open square structure.

23. The single-phase permanent magnet motor according to claim 1, characterized in that: The structural features include shape, size and relative position. The tooth body of each stator tooth is evenly distributed along the circumference of the rotor part, and the plurality of slots are unevenly distributed along the rotor part.

24. The single-phase permanent magnet motor according to claim 1, characterized in that: The plurality of notches include at least three different types of notch structures.

25. A vacuum cleaner, comprising a single-phase permanent magnet motor, characterized in that: The single-phase permanent magnet motor is the single-phase permanent magnet motor according to any one of claims 1 to 24.

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