Stator and magnetic shoe structure capable of reducing noise of external rotor motor

Abstract

The utility model relates to the technical field of motor magnetic shoes, in particular to a stator and magnetic shoe structure capable of improving noise of an external rotor motor, which comprises a stator main body and a plurality of magnetic shoe main bodies arranged on the outer side of the stator main body, a plurality of stator teeth are annularly distributed on the stator main body, and a stator slot is formed between every two adjacent stator teeth. An auxiliary groove is formed in the surface of an outer end tooth crown of each stator tooth; the magnetic tile main body is tile-shaped, a first arc surface and a second arc surface are arranged on the magnetic tile main body, two sides of the first arc surface and the second arc surface are side edges, and the circle center of the first arc surface and the circle center of the second arc surface are staggered in the vertical direction. The circle centers of the first arc surface and the second arc surface of the magnetic shoe main body are staggered, so that the pole-arc eccentric distance is generated, the pole-arc eccentric distance reduces the cogging torque and the torque pulsation of the stator, the sine degree of the back electromotive force waveform is higher, and the electromagnetic noise is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor magnetic tiles, in particular to a stator and magnetic tile structure capable of improving the noise of an outer rotor motor. Background Art

[0002] A surface-mounted permanent magnet motor (SMPM) is a special type of permanent magnet synchronous motor. Compared to traditional internal-mounted permanent magnet motors (IPM motors), the permanent magnets of SMPM motors are directly attached to the rotor surface rather than embedded inside the rotor.

[0003] In existing surface-mounted permanent magnet motors, the tile-shaped magnetic tiles in most cases have the same center of the inner and outer diameters. Furthermore, the outer diameter tooth crowns of the internal stators are smooth, resulting in high electromagnetic noise during operation. Therefore, we propose a stator and tile structure that can improve the noise of external rotor motors to address the above issues. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art in that the inner and outer diameters of the tile-shaped magnetic tiles in the surface-mounted permanent magnet motor are mostly the same center, and the outer diameter tooth crown of the internal stator is smooth, and to propose a stator and magnetic tile structure that can improve the noise of the outer rotor motor.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A stator and magnetic tile structure capable of improving the noise of an outer rotor motor includes a stator body and a plurality of magnetic tile bodies arranged outside the stator body. The stator body is provided with a plurality of stator teeth distributed in an annular pattern, with stator slots formed between adjacent stator teeth, and an auxiliary slot is provided on the surface of the outer end crown of each stator tooth.

[0007] The magnetic tile body is arranged in a tile shape, and a first arc surface and a second arc surface are arranged on the magnetic tile body. The two sides of the first arc surface and the second arc surface are side edges, and the center of the first arc surface and the center of the second arc surface are staggered in the vertical direction.

[0008] As a preferred technical solution of the present invention, the auxiliary slots penetrate the upper and lower end surfaces of the stator teeth, and the auxiliary slots reduce the tooth torque and torque pulsation, thereby improving electromagnetic noise.

[0009] As a preferred technical solution of the present invention, the radius of the circle where the first arc surface is located is smaller than the radius of the circle where the second arc surface is located, so that the centers of the first arc surface and the second arc surface are staggered.

[0010] As an optimal technical solution of the present invention, the side edges on both sides are provided with chamfers at one end close to the first arc surface, and the side edges on both sides are provided with rounded corners at one end close to the second arc surface. The chamfering and rounding treatment of the edges of the magnetic tile body improves the quality of the magnetic tile body and optimizes the back electromotive force waveform, thereby improving electromagnetic noise.

[0011] As an optimal technical solution of the utility model,

[0012] The beneficial effects of the utility model are:

[0013] 1. By staggering the centers of the first and second arc surfaces of the magnetic tile body, a pole arc eccentricity is generated. The pole arc eccentricity reduces the stator slot torque and torque ripple, making the back electromotive force waveform more sinusoidal, thereby improving electromagnetic noise;

[0014] 2. Chamfering and rounding of magnetic tile edges improves the quality of magnetic tiles and optimizes back electromotive force waveform to improve electromagnetic noise;

[0015] 3. By opening auxiliary grooves on the surface of the stator outer diameter crown, the cogging torque and torque pulsation are further reduced and the electromagnetic noise is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a stator and magnetic tile structure that can improve the noise of an outer rotor motor proposed by the present invention;

[0017] Figure 2 This is a structural schematic diagram of a stator body in a stator and magnetic tile structure that can improve the noise of an outer rotor motor proposed by the present invention;

[0018] Figure 3 This is a schematic structural diagram of a stator and magnetic tile main body in a magnetic tile structure that can improve the noise of an outer rotor motor proposed by the present invention;

[0019] Figure 4 This is a schematic diagram of the main structure of a stator and a magnetic tile body in a magnetic tile structure proposed by the present invention, which can improve the noise of an outer rotor motor.

[0020] In the figure: 1. Magnetic tile body; 11. First arc surface; 12. Second arc surface; 13. Side; 14. Fillet; 15. Chamfer; 2. Stator body; 21. Stator teeth; 22. Auxiliary slots. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Reference Figure 1-4 A stator and magnetic tile structure capable of improving noise in an outer rotor motor includes a stator body 2 and 12 magnetic tile bodies 1 arranged outside the stator body 2. The stator body 2 is provided with 12 stator teeth 21 distributed in an annular pattern. Stator slots are formed between two adjacent stator teeth 21. An auxiliary slot 22 is formed on the surface of the outer end crown of each stator tooth 21. The auxiliary slot 22 runs through the upper and lower end surfaces of the stator tooth 21. The auxiliary slot 22 reduces cogging torque and torque pulsation, thereby improving electromagnetic noise.

[0023] Among them, the magnetic tile body 1 is arranged in a tile shape, and a first arc surface 11 and a second arc surface 12 are arranged on the magnetic tile body 1. The two sides of the first arc surface 11 and the second arc surface 12 are side edges 13. The radius of the circle where the first arc surface 11 is located is 48.25 mm, and the radius of the circle where the second arc surface 12 is located is 142.85 mm. The center of the circle where the first arc surface 11 is located and the center of the circle where the second arc surface 12 is located are staggered in the upper and lower directions, resulting in pole arc eccentricity. The pole arc eccentricity reduces the cogging torque and torque pulsation, and the sinusoidality of the back electromotive force waveform is higher, thereby improving electromagnetic noise.

[0024] Secondly, a chamfer 15 is provided at one end of the side edges 13 close to the first arc surface 11, and a rounded corner 14 is provided at one end of the side edges 13 close to the second arc surface 12. The chamfer 15 and rounded corner 14 on the edge of the magnetic tile body 1 improve the quality of the magnetic tile body 1 and optimize the back electromotive force waveform, thereby improving electromagnetic noise.

[0025] In this embodiment: by staggering the center of the first arc surface 11 and the center of the second arc surface 12 on the magnetic tile body 1 in the vertical direction, a pole arc eccentricity is generated. The pole arc eccentricity reduces the cogging torque and torque pulsation, and the sinusoidality of the back electromotive force waveform is higher, thereby improving the electromagnetic noise. At the same time, by providing an auxiliary slot 22 on the outer wall of the stator body 2 that is adapted thereto, the cogging torque and torque pulsation are further reduced, thereby improving the electromagnetic noise.

[0026] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A stator and magnetic tile structure capable of improving the noise of an outer rotor motor, comprising a stator body (2) and a plurality of magnetic tile bodies (1) arranged outside the stator body (2), characterized in that: A plurality of stator teeth (21) are distributed in an annular pattern on the stator body (2), a stator slot is formed between two adjacent stator teeth (21), and an auxiliary slot (22) is provided on the surface of the outer end crown of each stator tooth (21); The magnetic tile body (1) is arranged in a tile shape, and a first arc surface (11) and a second arc surface (12) are arranged on the magnetic tile body (1), the two sides of the first arc surface (11) and the second arc surface (12) are side edges (13), and the center of the first arc surface (11) and the center of the second arc surface (12) are staggered in the vertical direction.

2. A stator and magnetic tile structure capable of improving the noise of an outer rotor motor according to claim 1, characterized in that: The auxiliary slot (22) passes through the upper and lower end surfaces of the stator tooth (21).

3. The stator and magnetic tile structure capable of improving the noise of an outer rotor motor according to claim 1, characterized in that: The radius of the circle where the first arc surface (11) is located is smaller than the radius of the circle where the second arc surface (12) is located.

4. The stator and magnetic tile structure capable of improving the noise of an outer rotor motor according to claim 1, characterized in that: One end of the side edge (13) on both sides close to the first arc surface (11) is provided with a chamfer (15), and one end of the side edge (13) close to the second arc surface (12) is provided with a rounded corner (14).

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