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 a stator tooth, wherein the stator teeth are multiple, and the multiple stator teeth are arranged to form a working chamber for accommodating a rotor part; wherein at least one of the multiple stator teeth has multiple divided teeth, at least one of the multiple divided teeth is provided with a first winding, and at least two adjacent divided teeth of the multiple divided teeth are provided with a second winding. By arranging a single stator tooth to have divided teeth and combining the arrangement of the winding, a starting torque is provided for the single-phase permanent magnet synchronous motor. The starting ability of the single-phase permanent magnet synchronous motor is effectively improved, and the starting current of the motor is reduced. The problem of dead points in motor starting in the prior art is solved, so that the single-phase motor can be started reliably. The single-phase motor has a small size, light weight, simple structure, is easy to manufacture on a large scale, and has a low manufacturing cost.

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 permanent magnet synchronous motors have single-phase windings, and require fewer switching devices to drive the main circuit, and the hardware cost of the control system is low. However, single-phase permanent magnet synchronous motors have the problem of starting dead point. The armature magnetic field generated by the stator core of single-phase permanent magnet synchronous motors is a pulsating magnetic field, and the electromagnetic torque generated has a 0 point. When the motor does not adopt a special structure, the motor parking position (the point where the tooth slot torque is 0) coincides with the point where the electromagnetic torque is 0. At this time, no matter what current is passed through the armature winding, the motor can only generate a force in the direction of the rotor diameter, and the tangential force is 0. At this time, the motor cannot start, and there is a problem of starting dead point.

[0003] Usually, single-phase permanent magnet synchronous motors use unequal air gaps (i.e., the air gap thickness under the same stator tooth varies) to solve the problem of starting dead point. However, the unequal air gap structure will increase the cogging torque, which will lead to an increase in the motor output torque pulsation. At the same time, the unequal air gap structure will increase the average air gap length of the motor, which will reduce the output torque density of the motor and cause the problem of low motor efficiency. 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 dead point in motor starting 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 synchronous motor is provided, comprising: a stator tooth, wherein the stator teeth are multiple, and the multiple stator teeth are arranged to form a working cavity for accommodating a rotor part; wherein at least one stator tooth among the multiple stator teeth has multiple sub-teeth, at least one of the multiple sub-teeth is provided with a first winding, and at least two adjacent sub-teeth among the multiple sub-teeth are provided with a second winding.

[0006] Further, along the rotation direction of the rotor part, the first winding is arranged on the divided teeth close to the rear end of the stator teeth.

[0007] Furthermore, the plurality of teeth each include a first tooth and a second tooth, the first tooth is located at the front end of the stator tooth, the second tooth is located at the rear end of the stator tooth, the first winding is arranged on the second tooth, and the second winding is arranged on the first tooth and the second tooth.

[0008] Furthermore, the number of turns of the winding of each stator tooth is n, n=a+b, wherein a is the number of turns of the coil of the second winding, and b is the number of turns of the coil of the first winding.

[0009] Furthermore, 0.1b≤a≤0.5b.

[0010] Furthermore, the thickness of the air gap formed between each of the divided teeth and the rotor part is different.

[0011] Further, the thickness g1 of the air gap formed between the second segment teeth and the rotor part is uniformly set, and the thickness g2 of the air gap formed between the first segment teeth and the rotor part is uniformly set, wherein g1>g2.

[0012] Furthermore, in the same stator tooth, a uniform air gap thickness is formed between at least one of the multiple segmented teeth and the rotor portion, and a gradual air gap thickness is formed between at least one of the remaining segmented teeth and the rotor portion.

[0013] Further, the thickness of the air gap formed between the first segment teeth and the rotor part is arranged to gradually decrease along the rotation direction of the rotor part, and / or a uniform air gap thickness is formed between the second segment teeth and the rotor part.

[0014] Further, the maximum air gap thickness formed between the first segmented teeth and the rotor part is g3, and the maximum air gap thickness formed between the second segmented teeth and the rotor part is g5, wherein g3≤g5.

[0015] Furthermore, tooth grooves are formed on the end faces of the divided teeth located at the rear ends of the stator teeth.

[0016] Furthermore, a chamfered surface is provided on the surface of the tooth shoe portion of the divided tooth located at the rear end of the stator tooth on the side facing the rotor portion, and the chamfered surface is a plane or an arc surface.

[0017] Further, the first winding and the second winding are arranged in series, or the first winding and the second winding are arranged in parallel.

[0018] Further, a surface of the first segmented tooth facing the second segmented tooth is arranged in parallel with a surface of the second segmented tooth facing the first segmented tooth.

[0019] According to another aspect of the present invention, there is provided a vacuum cleaner, 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.

[0020] By applying the technical solution of the present invention, a single stator tooth is set to have split teeth, and combined with the setting of the winding, a starting torque is provided for a single-phase permanent magnet synchronous motor. The starting ability of the single-phase permanent magnet synchronous motor is effectively improved, and the starting current of the motor is reduced. The problem of the dead point in the motor starting in the prior art is solved, so that the single-phase motor can be started reliably. The single-phase motor has a small size, light weight, simple structure, is easy to manufacture on a large scale, and has a low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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:

[0022] 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;

[0023] 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;

[0024] 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;

[0025] Figure 4 A schematic structural diagram of a fourth embodiment of a single-phase permanent magnet synchronous motor according to the present invention is shown;

[0026] Figure 5 Shows Figure 4 The enlarged structural diagram at A in the middle;

[0027] Figure 6 A schematic structural diagram of a fifth embodiment of a single-phase permanent magnet synchronous motor according to the present invention is shown;

[0028] Figure 7 Shows Figure 6 Enlarged structural diagram at B in the middle.

[0029] The above drawings include the following reference numerals:

[0030] 10. stator tooth; 11. divided tooth; 111. first divided tooth; 112. second divided tooth; 13. tooth groove; 14. tooth shoe; 15. chamfered surface;

[0031] 20. Rotor unit;

[0032] 30. The first winding;

[0033] 40. Second winding. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Combination Figures 1 to 7 As shown, according to a specific embodiment of the present application, a single-phase permanent magnet synchronous motor is provided.

[0039] Specifically, Figure 1 As shown, the single-phase permanent magnet synchronous motor includes a stator tooth 10. There are multiple stator teeth 10, and the multiple stator teeth 10 are arranged to form a working cavity for accommodating the rotor part 20. Among them, at least one stator tooth 10 among the multiple stator teeth 10 has multiple divided teeth 11, at least one of the multiple divided teeth 11 is provided with a first winding 30, and at least two adjacent divided teeth 11 among the multiple divided teeth 11 are provided with a second winding 40.

[0040] In this embodiment, a single stator tooth is configured to have split teeth, and combined with the configuration of the winding, a starting torque is provided for the single-phase permanent magnet synchronous motor. The starting capability of the single-phase permanent magnet synchronous motor is effectively improved, and the starting current of the motor is reduced. The problem of a dead point in motor starting in the prior art is solved, and the single-phase motor can be reliably started.

[0041] Among them, as shown in the rotation direction F of the rotor part 20, the first winding 30 is arranged on the divided tooth 11 near the rear end of the stator tooth 10. The front end and the rear end of the stator tooth in the present application refer to the end of the stator tooth line turning into the preset point along the rotation direction of the rotor part 20 as the front end, and the end turning into the preset point as the rear end. The technical solution in this embodiment can effectively improve the starting ability of the motor. The single-phase motor has a small size, light weight, simple structure, easy large-scale manufacturing and low manufacturing cost.

[0042] Specifically, the plurality of divided teeth 11 each include a first divided tooth 111 and a second divided tooth 112. The first divided tooth 111 is located at the front end of the stator tooth 10, the second divided tooth 112 is located at the rear end of the stator tooth 10, the first winding 30 is arranged on the second divided tooth 112, and the second winding 40 is arranged on the first divided tooth 111 and the second divided tooth 112. Such an arrangement can further effectively improve the starting capability of the motor.

[0043] The number of turns of the winding of each stator tooth 10 is n, where n=a+b, wherein a is the number of turns of the coil of the second winding 40, and b is the number of turns of the coil of the first winding 30. Preferably, 0.1b≤a≤0.5b.

[0044] In order to further improve the starting capability of the motor, the thickness of the air gap formed between each segment tooth 11 and the rotor part 20 can be different. The thickness g1 of the air gap formed between the second segment tooth 112 and the rotor part 20 is uniformly set, and the thickness g2 of the air gap formed between the first segment tooth 111 and the rotor part 20 is uniformly set, wherein g1>g2.

[0045] Further, in the same stator tooth 10, a uniform air gap thickness is formed between at least one of the multiple divided teeth 11 and the rotor part 20, and a gradual air gap thickness is formed between at least one of the remaining divided teeth 11 and the rotor part 20. Specifically, the air gap thickness formed between the first divided tooth 111 and the rotor part 20 is gradually reduced along the rotation direction of the rotor part 20, and a uniform air gap thickness is formed between the second divided tooth 112 and the rotor part 20. Figure 3 As shown, the maximum air gap thickness formed between the first segmented tooth 111 and the rotor part 20 is g3, the air gap thickness formed between the second segmented tooth 112 and the rotor part 20 is g5, wherein g3≤g5. The minimum air gap thickness formed between the first segmented tooth 111 and the rotor part 20 is g4.

[0046] like Figure 6 and Figure 7 As shown, a tooth slot 13 is provided on the end surface of the divided tooth 11 located at the rear end of the stator tooth 10. This arrangement can effectively increase the output torque of the motor and prevent the problem of the motor having a starting dead point.

[0047] like Figure 1 , Figure 4 and Figure 5 As shown, a chamfered surface 15 is provided on the surface of the tooth shoe portion 14 of the divided tooth 11 located at the rear end of the stator tooth 10 facing the rotor portion 20, and the chamfered surface 15 is a plane or an arc surface. This arrangement can also increase the output torque of the motor and effectively prevent the problem of the motor having a starting dead point.

[0048] In this embodiment, the first winding 30 is arranged in series with the second winding 40. Alternatively, the first winding 30 is arranged in parallel with the second winding 40. The surface of the first segmented tooth 111 facing the second segmented tooth 112 is arranged in parallel with the surface of the second segmented tooth 112 facing the first segmented tooth 111. This arrangement can reduce the difficulty of winding the segmented teeth and improve the production efficiency of the motor.

[0049] 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.

[0050] Specifically, the use of a tooth structure and a uniform air gap of the motor can improve the output torque. In addition, the torque pulsation motor can be reduced. The motor solves the starting problem of a single-phase motor through a special winding wiring method. Unlike conventional motors, each stator tooth of the motor involved is evenly split into two parts along the center line, and the winding method of the motor is adjusted at the same time. The winding method of the motor winding is different from that of a conventional motor. A part of the turns of the motor are wound on two stator teeth, and the other part of the turns are only wound on one of the stator teeth, that is, the number of turns of the motor is n, n = a + b, where a turns are wound on two divided teeth of the stator tooth, and b turns are wound on one of the iron cores. The divided tooth on which b turns are wound should be the first tooth portion of the stator tooth along the rotation direction of the motor. In order to ensure that the magnetic flux density on the stator teeth of the motor is as uniform as possible and to effectively eliminate the starting dead point, a and b have the following relationship: 0.1b≤a≤0.5b.

[0051] In order to obtain better starting capability, the two parts of the stator teeth can also be set to different air gap structures. Both parts of the stator teeth are uniform air gap structures, and the air gap thickness of the first part along the motor rotation direction is greater than the air gap thickness of the second part, or, the two parts of the stator teeth, one of which is a uniform air gap structure, and the other part is a gradient air gap structure. The gradient air gap structure is the second part of the stator tooth along the motor rotation direction. And the thickness of the gradient air gap is set to gradually decrease along the motor rotation direction.

[0052] Since the single-phase permanent magnet synchronous motor generates a pulsating magnetic field, there is a starting problem. The motor's stop position is usually the point where the tooth torque is 0. If the motor's electromagnetic torque is also 0 at this time, then no matter what current is passed through the motor at this time, the motor rotor will generate radial force and cannot generate tangential starting torque. At this time, the motor cannot start. This application combines the stator tooth split structure and winding arrangement to eliminate the motor starting dead point and reduce the starting current.

[0053] In one embodiment of the present application, Figure 1 As shown, the motor includes 4 stator teeth, and each stator tooth is split into two parts along the center line of the tooth. The structures of the 4 stator teeth of the stator core are exactly the same, and the air gaps of the two parts under a single tooth are uniform air gap structures and are completely symmetrically arranged. Compared with the gradient air gap, the use of a uniform air gap can slightly increase the output torque of the motor. And the motor stator is set to a split tooth structure, which can reduce the tooth slot torque of the motor and reduce the torque pulsation of the motor. Among them, the a turn is wound on the two divided teeth of the stator tooth, and the b turn is wound on one of the divided teeth. Since the motor divided teeth have no effect on the phase angle of the tooth slot torque of the motor, and the distribution of the motor windings will cause the electromagnetic torque of the motor to be offset, thereby causing a phase difference between the two torques, so that the starting dead point of the motor can be eliminated.

[0054] Furthermore, since the normal starting of the motor must ensure that the starting torque is in the same direction as the motor rotation direction, in order to obtain the positive starting torque, the direction of the motor winding offset needs to be opposite to the motor rotation direction. Therefore, the b-turn winding is wound on the teeth at the rear end of the motor rotation direction.

[0055] In order to make the magnetic field distribution on the two split teeth relatively uniform, the number of turns a cannot be too large. If a is too large, the magnetic flux density on one of the stator teeth will be large, which will increase the iron loss of the motor. If a is too small, the motor will have insufficient starting ability. Optimally, the number of turns a and b of the two windings have the following relationship: 0.1b≤a≤0.5b.

[0056] like Figure 2As shown in the figure, both air gaps of the split teeth adopt a uniform air gap structure, but the air gap thickness of the two parts of the split teeth is different. The air gap thickness of the split teeth at the rear end along the motor rotation direction is large, and the air gap thickness of the front end split teeth is small, that is, g1>g2. The different air gap thicknesses of the two parts can cause the rotor position to shift toward the motor rotation direction, thereby expanding the role of the starting winding and improving the motor starting torque.

[0057] like Figure 3 As shown, the two air gap thickness structures formed by the two divided teeth are different, one of which is a uniform air gap structure and the other is a gradient air gap structure. The stator tooth part of the gradient air gap is the second part of the stator tooth along the motor rotation direction. The thickness of the gradient air gap gradually decreases along the motor rotation direction. The gradient air gap can further increase the starting ability of the motor.

[0058] Under the same stator tooth, in the two divided teeth, the maximum gap thickness of the gradient air gap is less than or equal to the gap thickness of the uniform air gap, that is, g3≤g5. This setting can make the rotor offset an angle along the rotation direction of the motor, further improving the starting ability of the motor.

[0059] like Figure 4 and Figure 5 As shown, the shape of the single-sided tooth boot on the right side of the rear end tooth is wire cut to form a beveled surface, so as to modify the tooth into an outward-warped shape. When the motor rotates counterclockwise, when the outward-warped portion of the tooth boot is set on the right side of the rear end tooth, the center line of the permanent magnet can continue to shift counterclockwise by a certain distance when the motor stops, thereby increasing the angle between the center line of the winding pole and the center line of the permanent magnet, and increasing the starting angle of the motor. When it is set on the left side of the tooth, the starting angle will be reduced. The outward-warped structure of the single-sided tooth boot can also eliminate the starting dead point of the single-phase motor. Combining the outward-warping of the single-sided tooth boot with the tooth splitting can increase the starting torque and reduce the starting current of the motor.

[0060] The operating characteristics of the tooth shoe wire cutting are as follows: Figure 5 As shown in FIG. 1 , the wire cutting uses the top angle M of the tooth shoe as the positioning point as the horizontal reference line. The actual cutting line is translated downward from the horizontal reference line by a translation distance of d. At the same time, in order to reduce the torque ripple and noise during the operation of the motor, the obtuse angle and sharp angle generated by the wire cutting are further transformed into an arc transition mode. The radius of the arc segment is preferably of the same order of magnitude according to the size of the stator tooth shoe, as shown in FIG. Figure 4 shown.

[0061] like Figure 6 As shown, a rectangular slot is set at the rear end of the split tooth. When the motor rotates counterclockwise, when the rectangular slot is set at the rear end of the split tooth, the center line of the permanent magnet when the motor stops can continue to deviate counterclockwise by a certain distance, thereby increasing the angle between the center line of the winding magnetic pole and the center line of the permanent magnet, and increasing the starting angle of the motor.

[0062] The structure of single-sided slotting of stator teeth can also eliminate the starting dead point of single-phase motors, reduce the cogging torque and output torque pulsation of motors, and combine rectangular slotting with tooth splitting structure to obtain reduced torque pulsation and increased starting torque. The shape characteristics of the rectangular slot are: the distance between the center line of the rectangular slot and the center line of the split tooth is L, the height of the rectangular slot is H, and the width of the slot is D.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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 synchronous motor, characterized in that: include: Stator teeth (10), the stator teeth (10) being multiple, and the multiple stator teeth (10) are arranged to form a working cavity for accommodating a rotor part (20); The stator tooth (10) has a plurality of sub-teeth (11); in the same stator tooth (10), at least one of the plurality of sub-teeth (11) is provided with a first winding (30); and at least two adjacent sub-teeth (11) in the plurality of sub-teeth (11) are provided with a second winding (40); Wherein, in the same stator tooth (10), at least one of the plurality of segmented teeth (11) is a first segmented tooth (111), and at least one of the remaining segments is a second segmented tooth (112); the first segmented tooth (111) is located at the front end of the stator tooth (10), and the second segmented tooth (112) is located at the rear end of the stator tooth (10); the first winding (30) is arranged on the second segmented tooth (112), and the second winding (40) is arranged on the first segmented tooth (111) and the second segmented tooth (112); Wherein, along the rotation direction of the rotor part (20), the end of the stator tooth (10) that first rotates into the preset point is the front end of the stator tooth (10), and the end of the stator tooth (10) that rotates into the preset point later is the rear end of the stator tooth (10).

2. The single-phase permanent magnet synchronous motor according to claim 1, characterized in that: Along the rotation direction of the rotor part (20), the first winding (30) is arranged on the divided tooth (11) close to the rear end of the stator tooth (10).

3. The single-phase permanent magnet synchronous motor according to claim 1, characterized in that: The number of turns of the winding of each stator tooth (10) is n, where n=a+b, wherein a is the number of turns of the coil of the second winding (40), and b is the number of turns of the coil of the first winding (30).

4. The single-phase permanent magnet synchronous motor according to claim 3, characterized in that: 0.1b≤a≤0.5b.

5. The single-phase permanent magnet synchronous motor according to claim 1, characterized in that: The thickness of the air gap formed between each of the divided teeth (11) and the rotor part (20) is different.

6. The single-phase permanent magnet synchronous motor according to claim 1, characterized in that: The thickness g1 of the air gap formed between the second segment teeth (112) and the rotor part (20) is uniformly set, and the thickness g2 of the air gap formed between the first segment teeth (111) and the rotor part (20) is uniformly set, wherein g1>g2.

7. The single-phase permanent magnet synchronous motor according to claim 1, characterized in that: In the same stator tooth (10), a uniform air gap thickness is formed between at least one of the plurality of segment teeth (11) and the rotor part (20), and a gradually varying air gap thickness is formed between at least one of the remaining segment teeth (11) and the rotor part (20).

8. The single-phase permanent magnet synchronous motor according to claim 1, characterized in that: The thickness of the air gap formed between the first segmented teeth (111) and the rotor part (20) is arranged to gradually decrease along the rotation direction of the rotor part (20), and / or a uniform air gap thickness is formed between the second segmented teeth (112) and the rotor part (20).

9. The single-phase permanent magnet synchronous motor according to claim 8, characterized in that: The maximum air gap thickness formed between the first segmented tooth (111) and the rotor part (20) is g3, and the maximum air gap thickness formed between the second segmented tooth (112) and the rotor part (20) is g5, wherein g3≤g5.

10. The single-phase permanent magnet synchronous motor according to claim 1, characterized in that: A tooth groove (13) is provided on the end surface of the divided tooth (11) located at the rear end of the stator tooth (10).

11. The single-phase permanent magnet synchronous motor according to claim 1, characterized in that: A chamfered surface (15) is provided on the surface of the tooth shoe portion (14) of the divided tooth (11) located at the rear end of the stator tooth (10) on the side facing the rotor portion (20), and the chamfered surface (15) is a plane or an arc surface.

12. The single-phase permanent magnet synchronous motor according to claim 1, characterized in that: The first winding (30) and the second winding (40) are arranged in series, or the first winding (30) and the second winding (40) are arranged in parallel.

13. The single-phase permanent magnet synchronous motor according to claim 1, characterized in that: The surface of the first segmented tooth (111) facing the second segmented tooth (112) is arranged in parallel with the surface of the second segmented tooth (112) facing the first segmented tooth (111).

14. 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 13.

Images