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

Abstract

The present invention provides a single-phase permanent magnet synchronous motor and a vacuum cleaner having the same. The single-phase permanent magnet synchronous motor includes multiple types of stator teeth, and the multiple types of stator teeth include: first-type stator teeth; second-type stator teeth, the first-type stator teeth and the second-type stator teeth are arranged to form an annular working chamber for accommodating the rotor part; wherein, a uniform air gap radial thickness g1 is formed between the first-type stator teeth and the rotor part, and a uniform air gap radial thickness g2 is formed between the second-type stator teeth and the rotor part, g1≠g2. The motor is configured to have a configuration including multiple types of stator tooth structures, and the uniform air gap radial thickness formed between the two types of tooth structures and the rotor part is configured to be different. The uniform equal air gap stator teeth configured in this way can effectively reduce the motor torque pulsation and improve the output torque. At the same time, the uniform equal air gap structure can reduce the manufacturing difficulty and improve the manufacturing accuracy.

Description

Technical Field

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

[0002] Single-phase motors have single-phase windings, requiring fewer switching devices to drive the main circuit, resulting in lower control system hardware costs. However, the internal magnetic field of a single-phase motor is pulsating, and the motor's electromagnetic torque has a zero point. Without a specific structure, the motor's rest position (where the cogging torque is zero) coincides with the zero electromagnetic torque point. At this point, the motor will not start regardless of current flow, resulting in a starting dead point.

[0003] Single-phase permanent magnet motors typically use unequal air gaps (i.e., uniform air gaps with varying radial thicknesses under the same stator tooth) to address the starting dead point problem. However, this unequal air gap design increases cogging torque, which in turn increases motor output torque pulsation. Furthermore, the unequal air gap design increases the average air gap length, reducing the motor's output torque density. Summary of the Invention

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

[0005] To achieve the above-mentioned objective, according to one aspect of the present invention, a single-phase permanent magnet synchronous motor is provided, comprising multiple types of stator teeth, the multiple types of stator teeth comprising: first-type stator teeth; second-type stator teeth, the first-type stator teeth and the second-type stator teeth forming an annular working cavity for accommodating a rotor portion; wherein a uniform air gap radial thickness g1 is formed between the first-type stator teeth and the rotor portion, and a uniform air gap radial thickness g2 is formed between the second-type stator teeth and the rotor portion, and g1≠g2.

[0006] Furthermore, the central angle corresponding to the first contour line of the end surface of the first type of stator tooth facing the rotor part is γ1, and the central angle corresponding to the second contour line of the end surface of the second type of stator tooth facing the rotor part is γ2, where γ1>γ2, g1<g2.

[0007] Furthermore, there are a plurality of first-type stator teeth and a plurality of second-type stator teeth, and the plurality of first-type stator teeth and the plurality of second-type stator teeth are alternately arranged along the circumferential direction of the rotor portion.

[0008] Furthermore, along the rotation direction of the rotor part, with the second type of stator tooth as the reference starting point, the central angle formed by the line connecting the geometric center of the second contour line of the second type of stator tooth and the geometric center of the rotor part, and the line connecting the center of the first contour line of the adjacent first type of stator tooth and the geometric center of the rotor part is γ, where γ≠2π / s, and s is the number of motor slots.

[0009] Furthermore, along the rotation direction of the rotor part, with the second type of stator teeth as the reference starting point, the center angle formed by the line connecting the geometric center of the second contour line, the geometric center of the first contour line and the geometric center of the rotor part is γ3, where γ3<2π / s.

[0010] Furthermore, the single-phase permanent magnet synchronous motor also includes: third-type stator teeth, there are multiple third-type stator teeth, multiple first-type stator teeth, multiple second-type stator teeth, and multiple third-type stator teeth are alternately arranged in sequence along the circumference of the rotor part; wherein a gradient uniform air gap radial thickness is formed between the third-type stator teeth and the rotor part.

[0011] Furthermore, along the rotation direction of the rotor part, the radial thickness of the uniform air gap formed between the third type of stator teeth and the rotor part is gradually reduced.

[0012] Furthermore, a rear end of at least one of the first type of stator teeth and the second type of stator teeth, and a side facing the rotor part, is provided with a bevel structure, and the bevel structure is an inclined surface or an arc surface.

[0013] Furthermore, a rectangular groove is provided on the end surface of at least one of the first type of stator teeth and the second type of stator teeth facing the rotor part, and the rectangular groove is provided on one side of the geometric center line of the first type of stator teeth or the geometric center line of the second type of stator teeth.

[0014] Furthermore, a rectangular slot is provided at the rear end of the second type of stator teeth.

[0015] According to another aspect of the present invention, a vacuum cleaner is provided, comprising a single-phase permanent magnet synchronous motor, wherein the single-phase permanent magnet synchronous motor is the above-mentioned single-phase permanent magnet synchronous motor.

[0016] Applying the technical solution of the present invention, the motor is configured with multiple stator tooth structure types, with the uniform air gaps formed between the two tooth types and the rotor arranged at different radial directions. This uniform air gap stator tooth arrangement effectively reduces motor torque pulsation and improves output torque. Furthermore, the uniform air gap structure reduces manufacturing difficulty and improves manufacturing precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 A schematic structural diagram of a first embodiment of a single-phase permanent magnet synchronous motor according to the present invention is shown;

[0019] Figure 2 A schematic structural diagram of a second embodiment of a single-phase permanent magnet synchronous motor according to the present invention is shown;

[0020] Figure 3 A schematic structural diagram of a third embodiment of a single-phase permanent magnet synchronous motor according to the present invention is shown;

[0021] Figure 4 A structural schematic diagram of a third embodiment of a single-phase permanent magnet synchronous motor according to the present invention is shown.

[0022] The above drawings include the following reference numerals:

[0023] 10. First type stator teeth;

[0024] 20. Second type of stator teeth;

[0025] 30. Rotor unit;

[0026] 40. Third type stator teeth;

[0027] 50. Bevel structure;

[0028] 60. Rectangular groove. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this 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.

[0030] 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, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] 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 are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof 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 clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of this 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 layers and regions may be exaggerated, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0033] A single-phase permanent magnet synchronous motor includes at least two types of stator teeth with different structures. The different structures refer to different air gap structures formed between different types of stator teeth and the rotor portion. Among the air gap structures formed between each stator tooth and the rotor portion of the motor, at least two types of air gaps are uniform air gap structures. A uniform air gap refers to an air gap with a uniform radial thickness between the outline of a single stator tooth and the rotor portion, and the two uniform air gap structures have different thicknesses. In particular, when the motor includes only two types of stator teeth, the two types of stator teeth include first-type stator teeth and second-type stator teeth, and the first-type stator teeth and the second-type stator teeth are arranged to form an annular working cavity for accommodating the rotor portion. A uniform air gap of radial thickness g1 is formed between the first-type stator teeth and the rotor portion, and a uniform air gap of radial thickness g2 is formed between the second-type stator teeth and the rotor portion, where g1 ≠ g2.

[0034] Combine Figures 1 to 4 As shown, according to a specific embodiment of the present application, a single-phase permanent magnet synchronous motor is provided.

[0035] Specifically, the single-phase permanent magnet synchronous motor (hereinafter referred to as the motor) includes multiple types of stator teeth, including first-type stator teeth 10 and second-type stator teeth 20. The first-type stator teeth 10 and the second-type stator teeth 20 enclose an annular working cavity for accommodating the rotor portion 30. A uniform radial air gap thickness g1 is formed between the first-type stator teeth 10 and the rotor portion 30, and a uniform radial air gap thickness g2 is formed between the second-type stator teeth 20 and the rotor portion 30, where g1 ≠ g2.

[0036] In this embodiment, the motor is configured with multiple stator tooth structure types, and the radial thickness of the uniform air gap formed between the two types of tooth structures and the rotor portion is set to be different. This uniform air gap stator tooth configuration effectively reduces motor torque ripple and improves output torque. The uniform air gap structure also reduces manufacturing difficulty and improves manufacturing precision.

[0037] The first contour line of the end face of the first type of stator tooth 10 facing the rotor part 30 corresponds to a central angle γ1, and the second contour line of the end face of the second type of stator tooth 20 facing the rotor part 30 corresponds to a central angle γ2, wherein γ1>γ2, g1<g2. The rotor part 30 includes structures such as a rotor and a rotating shaft. The center of the central angle mentioned in this application refers to the geometric center of the rotor part. There are multiple first-type stator teeth 10 and multiple second-type stator teeth 20, and the multiple first-type stator teeth 10 and the multiple second-type stator teeth 20 are arranged alternately. This arrangement can effectively eliminate the problem of dead points when starting a single-phase motor. F in the figure is the rotation direction of the rotor part.

[0038] In adjacent first-class stator teeth 10 and second-class stator teeth 20, along the rotational direction of the rotor portion 30, with the second-class stator tooth 20 as the reference starting point, the central angle formed by the line connecting the geometric center of the second contour line of the second-class stator tooth 20 and the geometric center of the rotor portion 30, and the line connecting the center of the first contour line of the adjacent first-class stator tooth 10 and the geometric center of the rotor portion 30 is γ, where γ ≠ 2π / s, and s is the number of motor slots. To optimize the performance of the motor, along the rotational direction of the rotor portion 30, with the second-class stator tooth 20 as the reference starting point, the central angle formed by the line connecting the geometric center of the second contour line, the geometric center of the first contour line, and the geometric center of the rotor portion 30 is γ, where γ < 2π / s.

[0039] According to another embodiment of the present application, the single-phase permanent magnet synchronous motor further includes a third type of stator teeth 40. There are multiple third type stator teeth 40, with multiple first type stator teeth 10, multiple second type stator teeth 20, and multiple third type stator teeth 40 alternately arranged along the circumference of the rotor portion 30. A gradually varying, uniform air gap radial thickness is formed between the third type stator teeth 40 and the rotor portion 30.

[0040] like Figure 4 As shown, along the rotation direction of the rotor part 30, the radial thickness of the uniform air gap formed between the third type stator teeth 40 and the rotor part 30 is gradually reduced. This arrangement can reduce the torque pulsation of the motor.

[0041] like Figure 2 As shown, the rear end of at least one of the first type of stator teeth 10 and the second type of stator teeth 20, and the side facing the rotor part 30, is provided with a bevel structure 50, and the bevel structure 50 is an inclined surface or an arc surface. That is, among the first type of stator teeth 10 and the second type of stator teeth 20, at least one type of stator teeth is provided with a bevel structure 50 at the tooth shoe on the side opposite to the rotation direction of the motor. This arrangement is conducive to improving the starting torque of the motor. Among them, the front end and the rear end in this application are determined relative to the rotation direction of the rotor part. Along the rotation direction of the rotor part, the one that first enters the preset point is the front end, and the one that enters the preset point later is the rear end.

[0042] like Figure 3 As shown, according to another embodiment of the present application, a rectangular slot 60 is defined on the end surface of at least one of the first-type stator tooth 10 and the second-type stator tooth 20 facing the rotor portion 30. The rectangular slot 60 is located on one side of the geometric centerline of the first-type stator tooth 10 or the second-type stator tooth 20. This arrangement helps increase the starting torque.

[0043] Preferably, if Figure 3 As shown, a rectangular slot 60 is defined at the rear end of the second-type stator tooth 20. Stator teeth with smaller central angles are modified by rectangular slotting. When the motor rotates counterclockwise, the slot is located to the right of the centerline of the tooth. The distance between the centerline of the rectangular slot and the centerline of the tooth is L, the height of the rectangular slot is H, and the width is D. In other words, the rectangular slot 60 is located on the side of the outline of the first or second-type stator tooth, offset from the centerline in the direction opposite to the direction of motor rotation.

[0044] Specifically, when the motor rotates counterclockwise, the rectangular slot is located on the clockwise side of the second contour line center.

[0045] Specifically, a motor with this structure can solve the problem of single-phase motors experiencing a dead point at starting, improve starting torque, reduce torque ripple, and increase output torque. This eliminates the dead point problem associated with starting single-phase motors. The motor's individual teeth have an equal air gap structure, which reduces manufacturing complexity and improves manufacturing precision.

[0046] The motor is provided with at least two different stator teeth, and the stator teeth with different structures correspond to different air gaps. In this case, the uniform radial thickness of the air gap corresponding to the same stator tooth remains unchanged, but the uniform radial thickness of the air gap of the stator teeth with two different structures is different.

[0047] The two types of stator teeth are arranged alternately, but not evenly, meaning the spacing between teeth is different. Furthermore, the center angles of the air gaps corresponding to the two stator teeth are different, meaning the air gap lengths of the two stator teeth are different. Taking the tooth with the smaller center angle as the reference, the center angle between the center lines of the two adjacent stator teeth in the rotational direction is less than 2π / s.

[0048] The motor may further include another structure, wherein the corresponding air gap is a gradual air gap structure, that is, the thickness of the air gap under the same tooth changes. The gradual air gap is set so that the radial thickness of the uniform air gap of the motor gradually decreases along the rotation direction of the motor.

[0049] Stator tooth offset can solve the problem of the starting dead point in single-phase permanent magnet motors. By setting different uniform air gap radial thicknesses under different teeth, the offset angle between the two torques is increased, thereby improving the starting torque. Because single-phase permanent magnet motors have only one armature current, the magnetic field generated by the armature winding is a pulsating magnetic field, and the motor's electromagnetic torque has a zero point. If the single-phase permanent magnet motor does not adopt a specific structure, the motor's parking position (the point where the cogging torque is zero) coincides with the point where the electromagnetic torque is zero. At this time, no matter what form of current is passed through the motor's stator winding, the single-phase motor cannot generate tangential torque and cannot start. Therefore, the single-phase motor has the problem of a starting dead point.

[0050] A gradual air gap structure is often used to address starting issues, but this reduces output torque and makes motor assembly more difficult. To address the starting dead point issue, minimize the impact on motor output torque, and ease rotor installation, a stator structure with a uniform air gap across each tooth is being developed.

[0051] like Figure 1 As shown, the motor includes at least two different air gap structures. Both air gaps are uniform, meaning the radial thickness of the uniform air gap remains constant under the same gear. However, the thicknesses of the two air gaps differ, meaning g1 ≠ g2. A uniform air gap with a radial thickness has little effect on the motor's output torque and simplifies motor assembly and installation.

[0052] The central angles corresponding to the two air gaps are different, γ1≠γ2, meaning the arcs of the stator teeth corresponding to the two air gaps are unequal. The air gap with a larger central angle has a smaller uniform air gap radial thickness, i.e., g1 < g2. The air gap with a larger central angle can cause an offset between the cogging torque and the electromagnetic torque, resulting in a phase difference. To increase the phase difference between the two torques, the air gap corresponding to the tooth with the larger central angle is made smaller.

[0053] The motor only includes these two air gaps, and they are arranged alternately in a 1:1 ratio. Because the two tooth structures are different, if the two teeth are arranged asymmetrically, asymmetric magnetic pull will be generated, which will cause problems such as torque pulsation and high noise. Therefore, the two tooth structures need to be arranged alternately.

[0054] The central angle between the center of the contour line of the small tooth and the adjacent large tooth along the motor's rotation direction is 2π / s. Because the motor's electromagnetic torque offset is greater than the cogging torque offset, to obtain positive starting torque, the electromagnetic torque offset must be directed in the opposite direction of the motor's rotation.

[0055] Furthermore, the motor can also include another air gap structure different from the previous two. To further improve the motor's starting capability, a gradual air gap structure is added to the above embodiment. This gradual air gap structure can also generate positive starting torque. Combining these two structures, the single-phase permanent magnet motor can achieve greater starting torque and better starting capability.

[0056] Because the cogging torque and electromagnetic torque of the gradual air gap are both offset in the direction of the smaller stator air gap, and the angle of the cogging torque offset is larger. In order to obtain a larger starting angle and reduce the difficulty of starting, the radial thickness of the gradual air gap gradually decreases along the direction of motor rotation. Figure 4 shown.

[0057] Of the two stator tooth structures, at least one can be further designed with a single-sided outward-curved tooth shoe. This outward-curved structure can also eliminate the starting dead point of a single-phase motor. This stator tooth structure with a single-sided outward-curved tooth shoe can significantly increase starting torque and reduce motor starting current.

[0058] When the motor rotates counterclockwise, in order to obtain positive starting torque, the wire cutting part is located at the tooth shoe on the right side of the large tooth. The wire cutting uses the top angle M of the tooth shoe as the positioning point to make a reference line at an angle Φ to the horizontal line. Of course, the cutting line can also be translated downward from the reference line to perform cutting, with the translation distance d. At the same time, in order to reduce torque ripple and noise during motor operation, the obtuse angles and sharp angles generated by wire cutting are further converted into circular arc transitions. The radius of the circular arc segment is preferably of the same order of magnitude as the stator tooth shoe size, such as Figure 2 shown.

[0059] For the two stator teeth structures of the motor, at least one stator tooth can be further designed into a single-sided rectangular slot structure. The single-sided rectangular slot structure of the stator teeth can also eliminate the starting dead point of the single-phase motor, reduce the tooth slot torque and output torque pulsation of the motor, and the single-sided rectangular slot stator tooth structure can be superimposed to obtain smaller torque pulsation and larger starting torque. When the motor rotates counterclockwise, the slot is located to the right of the center line of the small tooth, that is, at the rear end of the stator tooth. The distance between the center line of the rectangular slot and the center line of the small tooth is L, the height of the rectangular slot is H, and the width of the slot is D. Figure 3 shown.

[0060] The single-phase permanent magnet synchronous 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 synchronous motor, which is the single-phase permanent magnet synchronous motor in the above embodiment.

[0061] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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.

[0062] In addition to the above, it should be noted that references to "one embodiment," "another embodiment," "an embodiment," and the like in this specification refer to specific features, structures, or characteristics described in conjunction with that embodiment as included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in conjunction with any embodiment, it is intended that such feature, structure, or characteristic, when implemented in conjunction with other embodiments, also falls within the scope of the present invention.

[0063] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0064] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A single-phase permanent magnet synchronous motor, characterized in that: The single-phase permanent magnet synchronous motor includes multiple types of stator teeth, and the multiple types of stator teeth include: First type stator teeth (10); Second-type stator teeth (20), wherein the first-type stator teeth (10) and the second-type stator teeth (20) are arranged to form an annular working chamber for accommodating a rotor portion (30); A uniform air gap radial thickness g1 is formed between the first type of stator teeth (10) and the rotor portion (30), and a uniform air gap radial thickness g2 is formed between the second type of stator teeth (20) and the rotor portion (30), g1≠g2; The central angle corresponding to the first contour line of the end face of the first type of stator tooth (10) facing the rotor part (30) is γ1, and the central angle corresponding to the second contour line of the end face of the second type of stator tooth (20) facing the rotor part (30) is γ2, wherein γ1>γ2, g1<g2.

2. The single-phase permanent magnet synchronous motor according to claim 1, characterized in that: There are a plurality of first-type stator teeth (10), and a plurality of second-type stator teeth (20). The plurality of first-type stator teeth (10) and the plurality of second-type stator teeth (20) are alternately arranged along the circumferential direction of the rotor part (30).

3. The single-phase permanent magnet synchronous motor according to claim 1, characterized in that: Along the rotation direction of the rotor part (30), with the second type of stator teeth (20) as a reference starting point, a central angle formed by a line connecting the geometric center of the second contour line of the second type of stator teeth (20) and the geometric center of the rotor part (30), and a line connecting the geometric center of the first contour line of the adjacent first type of stator teeth (10) and the geometric center of the rotor part (30) is γ, where γ≠2π / s, and s is the number of motor slots.

4. The single-phase permanent magnet synchronous motor according to claim 3, characterized in that: γ<2π / s.

5. The single-phase permanent magnet synchronous motor according to claim 1, characterized in that: The single-phase permanent magnet synchronous motor further comprises: a third type of stator teeth (40), wherein the third type of stator teeth (40) is a plurality, and a plurality of the first type of stator teeth (10), a plurality of the second type of stator teeth (20), and a plurality of the third type of stator teeth (40) are alternately arranged in sequence along the circumferential direction of the rotor portion (30); A gradually changing uniform air gap radial thickness is formed between the third type of stator teeth (40) and the rotor portion (30).

6. The single-phase permanent magnet synchronous motor according to claim 5, characterized in that: Along the rotation direction of the rotor part (30), the radial thickness of the uniform air gap formed between the third type of stator teeth (40) and the rotor part (30) is gradually reduced.

7. The single-phase permanent magnet synchronous motor according to claim 1, characterized in that: A bevel structure (50) is provided at the rear end of at least one of the first type of stator teeth (10) and the second type of stator teeth (20) and on the side facing the rotor part (30), wherein the bevel structure (50) is an inclined surface or an arc surface, wherein the rear end of the first type of stator teeth (10) and the second type of stator teeth (20) refers to the front end that first rotates into the preset point along the rotation direction of the rotor part, and the rear end that rotates into the preset point later is the rear end.

8. The single-phase permanent magnet synchronous motor according to claim 1, characterized in that: A rectangular slot (60) is provided on the end surface of at least one of the first type of stator teeth (10) and the second type of stator teeth (20) on the side facing the rotor portion (30), and the rectangular slot (60) is arranged on one side of the geometric center line of the first type of stator teeth (10) or the geometric center line of the second type of stator teeth (20).

9. The single-phase permanent magnet synchronous motor according to claim 8, characterized in that: The rectangular slot (60) is provided at the rear end of the second type of stator teeth (20).

10. A vacuum cleaner comprising a single-phase permanent magnet synchronous motor, characterized in that: The single-phase permanent magnet synchronous motor is the single-phase permanent magnet synchronous motor according to any one of claims 1 to 9.

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