Outer rotor permanent magnet synchronous motor

Abstract

The utility model discloses an outer rotor permanent magnet synchronous motor, which comprises a rotor component arranged in a motor shell, a stator component arranged in the rotor component, and a heat dissipation and noise reduction structure arranged on the stator component, the first bearing is arranged on one side of the outer rotor casing, and the plurality of permanent magnets are arranged in the outer rotor casing; the stator punching sheet group is arranged in the inner stator rack; the second bearing is arranged on one side of the stator punching sheet group; the plurality of stator teeth are arranged on the outer ring of the stator core, the stator accommodating grooves are arranged between the adjacent stator teeth, and the excitation windings are arranged in the stator accommodating grooves; in the heat dissipation and noise reduction structure, the heat dissipation part is arranged on the stator teeth, and the noise reduction part is arranged at one end of the stator teeth; the heat dissipation part comprises a first heat dissipation hole, a second heat dissipation hole and a third heat dissipation hole which are arranged on the stator teeth. According to the utility model, the heat radiation area of the stator surface can be effectively increased, convection heat radiation efficiency can be enhanced, stator temperature rise can be reduced, noise generation and transmission can be effectively weakened, and motor noise can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motor structures, in particular to an outer rotor permanent magnet synchronous motor. Background Art

[0002] A permanent magnet synchronous motor is a synchronous motor whose rotor is made of permanent magnet material. Unlike traditional synchronous motors, the rotor of a permanent magnet synchronous motor does not require external current to generate a magnetic field, but uses the magnetic field of a permanent magnet to drive the motor. Permanent magnet synchronous motors are widely used in industrial automation, electric vehicles, wind power generation and other fields, and are favored for their high efficiency, energy saving and environmental protection. Depending on the position of the permanent magnet on the rotor, permanent magnet synchronous motors are usually divided into surface rotor structures and built-in rotor structures.

[0003] Permanent magnet synchronous motors have the following characteristics: since there is no resistance in the rotor, the loss is small and the efficiency is high; they are small in size and light in weight, but can provide greater power; by accurately controlling the current, precise control of the motor speed and torque can be achieved; since the rotor structure is simple and there is no sliding contact, the maintenance cost is low and the life is long; since there are no brushes and commutators, the noise is low during operation.

[0004] CN220492839U in the prior art discloses an outer rotor permanent magnet synchronous motor. In the utility model, the center of the stator tooth circle is not concentric with the center of the stator inner diameter, thereby forming an uneven air gap, which can effectively optimize the motor performance, weaken the tooth slot torque, and suppress the vibration and noise of the motor. The design is simple and easy to operate.

[0005] Although the above-mentioned prior art solves the problems of large tooth torque of the concentric circle structure and strong motor vibration and noise, when the winding design is not a standard configuration, the shape of the stator core teeth causes uneven heat distribution, which may affect the heat dissipation efficiency of the motor and cause additional noise and vibration.

[0006] Therefore, there is an urgent need to improve the prior art to solve the above problems. Summary of the invention

[0007] The utility model overcomes the shortcomings of the prior art and provides an outer rotor permanent magnet synchronous motor.

[0008] To achieve the above object, the technical solution adopted by the utility model is: an outer rotor permanent magnet synchronous motor, comprising: a motor housing, a rotor component arranged inside the motor housing, a stator component arranged inside the rotor component, and a heat dissipation and noise reduction structure arranged on the stator component;

[0009] The rotor component comprises: an outer rotor housing, a first bearing arranged on one side of the outer rotor housing, and a plurality of permanent magnets arranged inside the outer rotor housing;

[0010] The stator component comprises: an inner stator frame, a stator sheet group arranged in the inner stator frame, and a second bearing arranged on one side of the stator sheet group;

[0011] The stator punching sheet group includes: a stator core, a plurality of stator teeth arranged on the outer ring of the stator core, a stator receiving slot arranged between adjacent stator teeth, and an excitation winding arranged in the stator receiving slot;

[0012] The heat dissipation and noise reduction structure comprises: a heat dissipation portion arranged on the stator teeth, and a noise reduction portion arranged at one end of the stator teeth; the heat dissipation portion comprises: a first heat dissipation hole, a second heat dissipation hole and a third heat dissipation hole arranged on the stator teeth.

[0013] In a preferred embodiment of the present invention, the first heat dissipation holes, the second heat dissipation holes and the third heat dissipation holes are arranged in a horizontal array and their diameters decrease sequentially.

[0014] In a preferred embodiment of the present invention, the noise removal part comprises: a first noise removal groove arranged at one end of the stator tooth, and a second noise removal groove arranged adjacent to the first noise removal groove.

[0015] In a preferred embodiment of the present invention, the noise removal parts are arranged at intervals at one end of a plurality of the stator teeth, and the number of the noise removal parts is an even number.

[0016] In a preferred embodiment of the present invention, the first denoising groove includes a first arc curve, and the second denoising groove includes a second arc curve.

[0017] In a preferred embodiment of the utility model, a first protrusion is provided on one side of the first circular arc curve, a second protrusion is provided between the first circular arc curve and the second circular arc curve, and a third protrusion is provided on one side of the second circular arc curve.

[0018] In a preferred embodiment of the utility model, a plurality of first mounting holes are arranged around the outer edge of the outer rotor housing, and a second mounting hole is arranged at the center of the motor housing.

[0019] In a preferred embodiment of the present invention, the stator punching sheet group is formed by stacking a plurality of stator cores.

[0020] In a preferred embodiment of the present invention, a plurality of connection holes are arranged around the outer edge of the outer rotor housing.

[0021] In a preferred embodiment of the utility model, the motor housing is provided with a transmission shaft, and the transmission shaft penetrates the rotor component and the stator component.

[0022] The utility model solves the defects existing in the background technology, and has the following beneficial effects:

[0023] (1) The utility model provides an outer rotor permanent magnet synchronous motor, which optimizes the heat dissipation and noise reduction design on the stator teeth. By setting a plurality of heat dissipation holes of decreasing size, the heat dissipation area of ​​the stator surface can be effectively increased, the convection heat dissipation efficiency can be enhanced, and the stator temperature rise can be reduced. At the same time, the spaced noise reduction grooves can be set to effectively reduce the noise generation and propagation, thereby reducing the motor noise.

[0024] (2) The noise reduction grooves of the utility model are arranged at intervals and cooperate with the arc-shaped structure, which can change the propagation path and mode of noise at the hip end of the stator to a certain extent. At the same time, multiple protrusions are provided to better disconnect the medium connection of noise propagation, reduce the degree of noise superposition, and are conducive to noise buffering and reduction. This design not only plays a role in noise reduction, but also retains the rigidity of the stator structure, thereby improving the stability and comfort of motor operation.

[0025] (3) The utility model can significantly improve the heat dissipation efficiency and reduce noise of the motor through the heat dissipation and noise reduction structure; the heat dissipation part is provided with multiple levels of heat dissipation holes, which are arranged in a horizontal array with diameters decreasing successively, which helps to form an effective heat dissipation channel, increase the heat dissipation area, and improve the heat exchange efficiency, thereby reducing the operating temperature of the motor and extending the life of the motor.

[0026] (4) The utility model provides heat dissipation holes with decreasing diameters, and can also finely arrange the size of the heat dissipation holes according to the heat generated at different positions, so as to more efficiently dissipate the heat at various positions. Compared with heat dissipation holes of a single specification, this design can more comprehensively and accurately meet the heat dissipation requirements of different parts of the stator.

[0027] (5) The utility model is provided with a plurality of mounting holes and connection holes, which are convenient for fixing the stator and the housing when assembling the motor, and are also beneficial for the motor performance detection and subsequent maintenance during use; this design improves the connection strength and overall stability between the various components of the motor, and also improves the convenience of product detection and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0029] Figure 1 It is an overall three-dimensional structural diagram of a preferred embodiment of the utility model;

[0030] Figure 2It is an overall three-dimensional structural diagram from another angle of a preferred embodiment of the utility model;

[0031] Figure 3 It is a side view of a preferred embodiment of the utility model;

[0032] Figure 4 It is a structural schematic diagram of a stator punching sheet group and a heat dissipation and noise reduction structure of a preferred embodiment of the utility model;

[0033] Figure 5 yes Figure 4 A magnified detail of the center point A;

[0034] In the figure: 1, rotor component; 11, outer rotor housing; 12, first bearing; 13, permanent magnet; 2, stator component; 21, inner stator frame; 22, stator punching group; 221, stator core; 222, stator teeth; 223, stator receiving slot; 224, excitation winding; 23, second bearing; 3, heat dissipation and noise reduction structure; 31, heat dissipation part; 311, first heat dissipation hole; 312, second heat dissipation hole; 313, third heat dissipation hole; 32, noise reduction part; 321, first noise reduction groove; 3211, first arc curve; 322, second noise reduction groove; 3221, second arc curve; 4, first protrusion; 41, second protrusion; 42, third protrusion; 5, first mounting hole; 51, second mounting hole; 6, connecting hole; 7, transmission shaft. DETAILED DESCRIPTION

[0035] The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0036] Figure 1 An outer rotor permanent magnet synchronous motor in the utility model is shown, which comprises: a motor housing, a rotor component 1 arranged inside the motor housing, a stator component 2 arranged inside the rotor component 1, and a heat dissipation and noise reduction structure 3 arranged on the stator component 2.

[0037] like Figure 2 As shown, a plurality of first mounting holes 5 are arranged around the outer edge of the outer rotor housing 11 , and a second mounting hole 51 is arranged in the center of the motor housing; a transmission shaft 7 is arranged on the motor housing, and the transmission shaft 7 passes through the rotor component 1 and the stator component 2 .

[0038] The motor optimizes the heat dissipation and noise reduction design on the stator teeth 222. By setting a plurality of heat dissipation holes of decreasing size, the heat dissipation area of ​​the stator surface can be effectively increased, the convection heat dissipation efficiency can be enhanced, and the stator temperature rise can be reduced. At the same time, the spaced noise reduction grooves can be set to effectively reduce the noise generation and propagation and reduce the motor noise.

[0039] This motor is provided with multiple mounting holes and connection holes 6, which are convenient for adding stators and housings when assembling the motor, and are also beneficial for motor performance testing and subsequent maintenance during use; this design improves the connection strength and overall stability between the various components of the motor, and also improves the convenience of product testing and maintenance.

[0040] like Figure 3 As shown, the rotor component 1 includes: an outer rotor housing 11, a first bearing 12 arranged on one side of the outer rotor housing 11, and a plurality of permanent magnets 13 arranged inside the outer rotor housing 11; a plurality of connection holes 6 are arranged around the outer edge of the outer rotor housing 11.

[0041] The stator component 2 includes: an inner stator frame 21 , a stator sheet group 22 arranged in the inner stator frame 21 , and a second bearing 23 arranged on one side of the stator sheet group 22 ; the stator sheet group 22 is formed by stacking a plurality of stator cores 221 .

[0042] like Figure 4 As shown, the stator punching sheet group 22 includes: a stator core 221 , a plurality of stator teeth 222 arranged on the outer ring of the stator core 221 , stator receiving slots 223 arranged between adjacent stator teeth 222 , and an excitation winding 224 arranged in the stator receiving slots 223 .

[0043] The heat dissipation and noise reduction structure 3 includes: a heat dissipation portion 31 disposed on the stator tooth 222 , and a noise reduction portion 32 disposed at one end of the stator tooth 222 ; the heat dissipation portion 31 includes: a first heat dissipation hole 311 , a second heat dissipation hole 312 and a third heat dissipation hole 313 disposed on the stator tooth 222 .

[0044] The heat dissipation and noise reduction structure 3 can significantly improve the heat dissipation efficiency of the motor and reduce noise; the heat dissipation part 31 is provided with multiple levels of heat dissipation holes, which are arranged in a horizontal array with diameters decreasing successively, which helps to form an effective heat dissipation channel, increase the heat dissipation area, and improve the heat exchange efficiency, thereby reducing the operating temperature of the motor and extending the life of the motor.

[0045] The first heat dissipation holes 311 , the second heat dissipation holes 312 and the third heat dissipation holes 313 are arranged in a horizontal array and their diameters decrease sequentially.

[0046] By setting heat dissipation holes with decreasing diameters, the size of the heat dissipation holes can be finely arranged according to the heat generated at different locations, so as to evacuate the heat at various locations more efficiently. Compared with heat dissipation holes of a single specification, this design can more comprehensively and accurately meet the heat dissipation needs of different parts of the stator.

[0047] The noise eliminator 32 includes: a first noise eliminator slot 321 disposed at one end of the stator tooth 222, and a second noise eliminator slot 322 disposed adjacent to the first noise eliminator slot 321; and the noise eliminator 32 is disposed at intervals at one end of a plurality of stator teeth 222, and the number of the noise eliminator 32 disposed is an even number.

[0048] The first denoising groove 321 includes a first arc curve 3211 , and the second denoising groove 322 includes a second arc curve 3221 ; a first protrusion 4 is provided on one side of the first arc curve 3211 , a second protrusion 41 is provided between the first arc curve 3211 and the second arc curve 3221 , and a third protrusion 42 is provided on one side of the second arc curve 3221 .

[0049] The noise reduction grooves are arranged at intervals and coordinated with an arc-shaped structure, which can change the propagation path and mode of noise at the hip end of the stator to a certain extent. At the same time, multiple protrusions are provided to better disconnect the medium connection of noise propagation, reduce the degree of noise superposition, and facilitate noise buffering and reduction. This design not only plays a role in noise reduction, but also retains the rigidity of the stator structure, improving the stability and comfort of motor operation.

[0050] When the utility model is used, power is supplied to the stator winding of the motor, and a rotating electromagnetic field is generated inside the stator through the current; the rotating electromagnetic field interacts with the permanent magnet 13 on the rotor to generate a rotating driving force, so that the motor starts to rotate. The heat dissipation part 31 enhances the heat dissipation effect through the first, second, and third heat dissipation holes 313 with successively decreasing diameters on the stator teeth 222 to ensure that the motor will not overheat during efficient operation; the noise reduction part 32 reduces the noise during motor operation through the first noise reduction groove 321 and the second noise reduction groove 322 at one end of the stator teeth 222 to improve the user experience of the motor; the transmission shaft 7 in the center of the motor housing passes through the rotor component 1 and the stator component 2 to ensure that the power can be smoothly transmitted. The above is based on the ideal embodiment of the utility model as inspiration. Through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of ​​this utility model. The technical scope of this utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. An outer rotor permanent magnet synchronous motor, comprising: A motor housing, a rotor component (1) arranged inside the motor housing, a stator component (2) arranged inside the rotor component (1), and a heat dissipation and noise reduction structure (3) arranged on the stator component (2), characterized in that: The rotor component (1) comprises: an outer rotor housing (11), a first bearing (12) arranged on one side of the outer rotor housing (11), and a plurality of permanent magnets (13) arranged inside the outer rotor housing (11); The stator component (2) comprises: an inner stator frame (21), a stator sheet group (22) arranged in the inner stator frame (21), and a second bearing (23) arranged on one side of the stator sheet group (22); The stator punching sheet group (22) comprises: a stator core (221), a plurality of stator teeth (222) arranged on the outer ring of the stator core (221), a stator receiving slot (223) arranged between adjacent stator teeth (222), and an excitation winding (224) arranged in the stator receiving slot (223); The heat dissipation and noise reduction structure (3) comprises: a heat dissipation portion (31) arranged on the stator tooth (222), and a noise reduction portion (32) arranged at one end of the stator tooth (222); the heat dissipation portion (31) comprises: a first heat dissipation hole (311), a second heat dissipation hole (312), and a third heat dissipation hole (313) arranged on the stator tooth (222).

2. The outer rotor permanent magnet synchronous motor according to claim 1, characterized in that: The first heat dissipation holes (311), the second heat dissipation holes (312) and the third heat dissipation holes (313) are arranged in a horizontal array and their diameters decrease sequentially.

3. The outer rotor permanent magnet synchronous motor according to claim 1, characterized in that: The noise removal portion (32) comprises: a first noise removal groove (321) arranged at one end of the stator tooth (222), and a second noise removal groove (322) arranged adjacent to the first noise removal groove (321).

4. The outer rotor permanent magnet synchronous motor according to claim 1, characterized in that: The noise removal parts (32) are arranged at intervals at one end of a plurality of the stator teeth (222), and the number of the noise removal parts (32) arranged is an even number.

5. The outer rotor permanent magnet synchronous motor according to claim 3, characterized in that: The first denoising groove (321) includes a first circular arc curve (3211), and the second denoising groove (322) includes a second circular arc curve (3221).

6. The outer rotor permanent magnet synchronous motor according to claim 5, characterized in that: A first protrusion (4) is provided on one side of the first circular arc curve (3211), a second protrusion (41) is provided between the first circular arc curve (3211) and the second circular arc curve (3221), and a third protrusion (42) is provided on one side of the second circular arc curve (3221).

7. The outer rotor permanent magnet synchronous motor according to claim 1, characterized in that: A plurality of first mounting holes (5) are arranged around the outer edge of the outer rotor housing (11), and a second mounting hole (51) is arranged at the center of the motor housing.

8. The outer rotor permanent magnet synchronous motor according to claim 1, characterized in that: The stator punching sheet group (22) is formed by stacking a plurality of stator cores (221).

9. The outer rotor permanent magnet synchronous motor according to claim 1, characterized in that: A plurality of connection holes (6) are arranged around the outer edge of the outer rotor housing (11).

10. The outer rotor permanent magnet synchronous motor according to claim 1, characterized in that: The motor housing is provided with a transmission shaft (7), and the transmission shaft (7) is arranged through the rotor component (1) and the stator component (2).

Images