Stator and rotor structure of low-noise high-rotating-speed brushless motor

Abstract

The utility model provides a stator and rotor structure of low noise high rotation speed brushless motor relates to brushless motor stator and rotor field, including: stator main part and rotor main part, stator main part is provided outside rotor main part, stator main part includes stator iron core, and stator iron core internal is provided with sound absorbing member, and the rotor main part is provided with the sound absorbing member. The stator body comprises a stator core, the inner edge of the stator core is provided with a heat dissipation groove, a stator coil is wound in the heat dissipation groove, the outer side of the stator core is provided with a heat conduction silica gel layer, the outer side of the heat conduction silica gel layer is provided with a heat conduction ring, the rotor body comprises a rotor core, and the rotor core is internally provided with heat dissipation holes. And the center of the rotor core is connected with a rotating shaft. The motor has good heat dissipation and low-noise operation effects.

Description

Technical Field

[0001] This utility model relates to the field of stator and rotor technology of brushless motors, specifically to a stator and rotor structure for a low-noise, high-speed brushless motor. Background Technology

[0002] Currently, the stator and rotor of brushless permanent magnet motors can be made of stamped silicon steel sheets. A DC brushless motor consists of a motor body and a driver, and is a typical mechatronic product. A brushless motor refers to a motor without brushes and a commutator (or slip rings), also known as a commutatorless motor. The rotating part (rotor) of the motor is called the iron core, on which pairs of N and S pole magnets are installed; the stationary part is called the stator. Coil windings are installed on the stator, which generate magnetic force when energized, utilizing the principle of like poles repelling and unlike poles attracting. This generates electromagnetic torque for energy conversion. However, current stator-rotor assemblies include a stator body and a rotor body. The stator body is formed by stamping and stacking multiple stator silicon steel sheets to form an integral structure. Similarly, the rotor body is also formed by stamping and stacking rotor silicon steel sheets to form an integral structure. Slots are set on the stator body, and magnet slots are set on the rotor body, with the magnets assembled within the magnet slots.

[0003] After searching, the existing technology (publication number: CN220342138U) describes "a stator-rotor assembly, belonging to the field of brushless motor technology, which solves the problem of how to improve the structure of the stator-rotor assembly and increase assembly efficiency; the key points of its technical solution are: including a stator body and a rotor body, the stator body is formed by punching and stacking multiple stator silicon steel sheets to form an integral structure, the rotor body is formed by punching and stacking rotor silicon steel sheets to form an integral structure, wire slots are set on the stator body, and magnet slots are set on the rotor body. The magnet slots are used to assemble magnets. The stator silicon steel sheets are provided with first-type positioning slots at both ends of the two perpendicular axes of symmetry about the distribution of the wire slots, second-type positioning slots are set at the axis of symmetry between two adjacent coil slots, and third-type positioning slots are set on the radius extension line of the longest arc edge of the coil slot. The effect achieved is: to improve assembly efficiency."

[0004] While existing stator and rotor assemblies have improved assembly efficiency, some shortcomings still exist: in existing brushless motors, only the stator's heat dissipation slots provide heat dissipation during operation, and the thermal conductivity of the connection with the motor housing is inconsistent, resulting in poor overall heat dissipation performance. High-power brushless motors are prone to overheating during long-term operation. Secondly, there is still the problem of operating noise. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, a stator and rotor structure for a low-noise, high-speed brushless motor is provided to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, a stator-rotor structure for a low-noise, high-speed brushless motor is provided, comprising: a stator body and a rotor body. The stator body is located outside the rotor body. The stator body includes a stator core, and a sound-absorbing component is provided inside the stator core. A heat dissipation groove is provided on the inner edge of the stator core, and a stator coil is wound inside the heat dissipation groove. A thermally conductive silicone layer is provided on the outer side of the stator core, and a thermally conductive ring is provided on the outer side of the thermally conductive silicone layer. The rotor body includes a rotor core, and a heat dissipation hole is provided inside the rotor core. A rotating shaft is connected to the center of the rotor core.

[0007] Preferably, the sound-absorbing component includes a through hole inside the stator core, and a sound-absorbing layer is provided inside the through hole, and a heat-conducting layer is provided outside the sound-absorbing layer.

[0008] Preferably, the heat dissipation grooves are provided with protrusions, and the stator coils are wound around the outside of the protrusions.

[0009] Preferably, the outer edge of the stator core is provided with a strip groove, and the inside of the strip groove is provided with thermal grease, and the thermal grease is arranged in a ring with equal spacing.

[0010] Preferably, the thermally conductive silicone layer is in contact with the thermally conductive grease, and the inner and outer sides of the thermally conductive ring are fixedly connected to the thermally conductive silicone layer and the inner wall of the brushless motor housing, respectively.

[0011] Preferably, the heat dissipation holes are opened along the axial direction of the rotor core, and the heat dissipation holes are arranged in a ring at equal intervals along the circumference of the rotor core.

[0012] Preferably, the outer wall of the rotor core is provided with aluminum strips, and the two ends of the rotor core are provided with end rings, and the outer wall of the end rings is provided with fan blades.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. By utilizing the stator core included in the stator body and the heat dissipation grooves opened inside the stator core, heat dissipation is achieved between the stator core and the rotor core. At the same time, through the thermal grease and thermal silicone layer, the heat inside the stator core is transferred to the outside, and then transferred to the brushless motor housing through the heat conduction ring. Heat is then dissipated through the heat sink on the outside of the housing. Meanwhile, the fan blades set at both ends of the rotor core and the heat dissipation holes opened inside the rotor core can drive the fan blades at both ends to rotate when the rotor core rotates, thereby achieving the heat dissipation effect. The heat dissipation holes increase the contact area between the rotor core and the airflow, improving the heat dissipation performance.

[0015] 2. By utilizing the sound-absorbing components inside the rotor core, the sound-absorbing layer included in the components absorbs the noise generated during the operation of the rotor and stator. The outer heat-conducting layer and the outer heat-conducting silicone layer have a certain elasticity and compression ratio, which not only provides thermal conductivity but also has a certain absorption and shock absorption effect, thereby achieving a certain degree of noise reduction. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the axial cross-sectional structure of the rotor stator according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the rotor body structure according to an embodiment of the present utility model.

[0018] Figure 3 This is a cross-sectional structural diagram of the sound-absorbing component according to an embodiment of the present utility model.

[0019] Figure 4 This is a schematic diagram of the stator main structure according to an embodiment of the present utility model.

[0020] In the diagram: 1. Stator body; 11. Stator core; 12. Sound-absorbing component; 121. Sound-absorbing layer; 122. Thermal conductive layer; 13. Heat dissipation groove; 14. Stator coil; 15. Thermal grease; 16. Thermal silicone layer; 17. Thermal ring; 2. Rotor body; 21. Rotor core; 22. Aluminum bar; 23. End ring; 24. Fan blade; 25. Shaft; 26. Heat dissipation hole. Detailed Implementation

[0021] Reference Figures 1 to 4 As shown, this utility model provides a stator and rotor structure for a low-noise, high-speed brushless motor, including: a stator body 1 and a rotor body 2. The stator body 1 is located on the outside of the rotor body 2. The stator body 1 includes a stator core 11, and a sound-absorbing component 12 is provided inside the stator core 11. A heat dissipation groove 13 is provided on the inner edge of the stator core 11, and a stator coil 14 is wound inside the heat dissipation groove 13. A thermally conductive silicone layer 16 is provided on the outside of the stator core 11, and a thermally conductive ring 17 is provided on the outside of the thermally conductive silicone layer 16. The rotor body 2 includes a rotor core 21, and a heat dissipation hole 26 is provided inside the rotor core 21. A rotating shaft 25 is connected to the center of the rotor core 21.

[0022] In this embodiment, the stator body 1 and the rotor body 2 constitute the stator and rotor structure of the low-noise, high-speed brushless motor involved in this application.

[0023] Specifically, the thermally conductive silicone layer 16 is wrapped around the outer wall of the stator core 11, and the thermally conductive ring 17 is made of a thermally conductive material.

[0024] Specifically, the rotating shaft 25 is fixedly installed to the mounting hole in the center of the rotor core 21 by means of a keyway and key block connection, wherein the keyway is formed in the inner wall of the mounting hole.

[0025] like Figures 1 to 4 In the design, the sound-absorbing component 12 includes a through hole inside the stator core 11, and a sound-absorbing layer 121 is provided inside the through hole. A heat-conducting layer 122 is provided on the outside of the sound-absorbing layer 121. A protrusion is provided between the heat dissipation grooves 13, and the stator coil 14 is wound around the outside of the protrusion. A strip groove is provided on the outer edge of the stator core 11, and a thermal grease 15 is provided inside the strip groove. The thermal grease 15 is arranged in a ring with equal spacing. A thermal silicone layer 16 is in contact with the thermal silicone grease 15. The inner and outer sides of the thermal ring 17 are fixedly connected to the thermal silicone layer 16 and the inner wall of the brushless motor housing, respectively. Heat dissipation holes 26 are opened along the axial direction of the rotor core 21, and the heat dissipation holes 26 are arranged in a ring with equal spacing along the circumference of the rotor core 21. An aluminum strip 22 is provided on the outer wall of the rotor core 21, and end rings 23 are provided at both ends of the rotor core 21. A fan blade 24 is provided on the outer wall of the end rings 23.

[0026] Specifically, the sound-absorbing layer 121 is made of ceramic fiber composite material, and the heat-conducting layer 122 is made of silicone. The ceramic fiber composite material not only has sound absorption effect, but also has good thermal conductivity.

[0027] As a preferred implementation, by setting the strip groove and the internal thermal grease 15, heat can be conducted over a large area inside the stator core 11.

[0028] It should be noted that a connecting block is provided on the outer wall of the stator core 11. The connecting block passes through the thermally conductive silicone layer 16 and connects to the thermally conductive ring 17. The connecting block is also made of magnetic steel, thereby strengthening the connection between the stator core 11 and the thermally conductive ring 17.

[0029] In use, the stator core, included in the stator body, and the heat dissipation grooves inside the stator core, achieve heat dissipation between the stator core and the rotor core. Simultaneously, thermal grease and thermal silicone layers transfer heat from the stator core outwards, then through a heat-conducting ring to the brushless motor housing, where it is dissipated by heat sinks on the outer side of the housing. Additionally, the fan blades at both ends of the rotor core, along with the heat dissipation holes inside the rotor core, drive the fan blades to rotate as the rotor core rotates, further enhancing heat dissipation. The heat dissipation holes increase the contact area between the rotor core and the airflow, improving heat dissipation performance. Sound-absorbing components inside the rotor core absorb noise during rotor-stator operation through their sound-absorbing layers. The outer thermally conductive layers and the outer thermal silicone layers possess elasticity and compressibility, providing not only thermal conductivity but also some vibration damping and amplification effects, thus achieving a certain degree of noise reduction.

[0030] The stator and rotor structure of the low-noise, high-speed brushless motor of this invention can effectively solve the problems mentioned in the background technology, and achieve good heat dissipation and low-noise operation based on the existing stator and rotor structure technology of brushless motors.

Claims

1. A stator and rotor structure for a low-noise, high-speed brushless motor, comprising: The stator body (1) and the rotor body (2) are located on the outside of the rotor body (2). The stator body (1) includes a stator core (11), and a sound-absorbing component (12) is provided inside the stator core (11). A heat dissipation groove (13) is provided on the inner edge of the stator core (11), and a stator coil (14) is wound inside the heat dissipation groove (13). A thermally conductive silicone layer (16) is provided on the outside of the stator core (11), and a thermally conductive ring (17) is provided on the outside of the thermally conductive silicone layer (16). The rotor body (2) includes a rotor core (21), and a heat dissipation hole (26) is provided inside the rotor core (21). A rotating shaft (25) is connected at the center of the rotor core (21).

2. The stator and rotor structure of a low-noise, high-speed brushless motor according to claim 1, characterized in that, The sound-absorbing component (12) includes a through hole opened inside the stator core (11), and a sound-absorbing layer (121) is provided inside the through hole, and a heat-conducting layer (122) is provided outside the sound-absorbing layer (121).

3. The stator and rotor structure of a low-noise, high-speed brushless motor according to claim 1, characterized in that, The heat dissipation grooves (13) are provided with protrusions, and the stator coils (14) are wound around the outside of the protrusions.

4. The stator and rotor structure of a low-noise, high-speed brushless motor according to claim 1, characterized in that, The outer edge of the stator core (11) is provided with a strip groove, and the inside of the strip groove is provided with thermal grease (15), and the thermal grease (15) is arranged in a ring with equal spacing.

5. The stator and rotor structure of a low-noise, high-speed brushless motor according to claim 1, characterized in that, The thermally conductive silicone layer (16) is in contact with the thermally conductive grease (15), and the inner and outer sides of the thermally conductive ring (17) are fixedly connected to the thermally conductive silicone layer (16) and the inner wall of the brushless motor housing, respectively.

6. The stator and rotor structure of a low-noise, high-speed brushless motor according to claim 1, characterized in that, The heat dissipation holes (26) are opened along the axial direction of the rotor core (21), and the heat dissipation holes (26) are arranged in a ring at equal intervals along the circumferential direction of the rotor core (21).

7. The stator and rotor structure of a low-noise, high-speed brushless motor according to claim 1, characterized in that, The outer wall of the rotor core (21) is provided with aluminum strips (22), and the two ends of the rotor core (21) are provided with end rings (23), and the outer wall of the end rings (23) is provided with fan blades (24).

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