Brushless outer rotor motor and food processor
By optimizing the structural design of the brushless external rotor motor, increasing the axial length of the stator core, and using permanent magnet magnetic attraction and self-lubricating material protrusion support, the problem of balancing motor size and torque was solved, resulting in a significant improvement in torque and stability.
Patent Information
- Application Number
- CN202422864828.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-22
AI Technical Summary
The external rotor motor of existing food processors is limited by the diameter of the heating plate, making it difficult to balance the requirements for motor size and torque.
Design a brushless external rotor motor with a rotor assembly outer diameter of 20-60mm and a stator core axial length of 10-50mm. The ratio of the rotor outer diameter to the stator core axial length is 0.4-6. Increasing the stator core axial length increases the torque. At the same time, the stability of the rotor assembly and the friction reduction are ensured by the magnetic attraction of permanent magnets and the convex support structure of self-lubricating material.
A large rated torque is achieved with a small radial dimension of the motor, while reducing maintenance costs and improving the stability and service life of the motor.
Smart Images
Figure CN223527872U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of small household appliances, in particular to a brushless outer rotor motor and a food processor. BACKGROUND
[0002] Some food processors include an outer rotor motor, which can be installed on a heating disc, so that the installation of the outer rotor motor is limited by the diameter of the heating disc, which puts higher requirements on the size of the motor, and also meets the torque requirement under rated power. SUMMARY
[0003] The present application provides a brushless outer rotor motor and a food processor, which has a smaller motor structure size and meets the torque requirement.
[0004] A brushless outer rotor motor, comprising:
[0005] A stator assembly comprising a stator core;
[0006] A rotor assembly arranged around the outside of the stator assembly, the rotor assembly being rotatable, the outer diameter of the rotor assembly being 20-60mm, the axial length of the stator core being 10-50mm, and the ratio of the outer diameter of the rotor assembly to the axial length of the stator core being 0.4-6.
[0007] The brushless outer rotor motor provided by the present application has an outer diameter of the rotor assembly of 20-60mm, a relatively small radial dimension, based on which the axial length of the stator core is moderately increased, the axial length of the stator core being 10-50mm, and the ratio of the outer diameter of the rotor assembly to the axial length of the stator core being 0.4-6, so that the rated torque is moderately increased, and the rated torque of the motor is ensured under the condition of a smaller radial dimension of the motor.
[0008] Optionally, the stator assembly and the rotor assembly are detachably connected. The detachable structure facilitates maintenance and replacement of the stator assembly and the rotor assembly, and reduces the maintenance cost of the motor.
[0009] Optionally, the rotor assembly comprises a rotor shell located at the outermost side of the motor, and the rotor shell is provided with a radial stirring portion. In this way, the stirring portion is directly arranged on the rotor shell of the motor, so that the integration of the stirring portion and the rotor assembly is higher, the motor structure is novel, and the motor itself also has a whipping function.
[0010] Optionally, the rotor assembly further comprises a permanent magnet encapsulated in the rotor shell, the stator core is made of magnetically conductive material, the stator core is arranged in the magnetic field range of the permanent magnet, and the magnetic force of the permanent magnet can act on the stator core. In this way, the magnetic field force of the permanent magnet can generate an attractive force on the stator core, which can prevent the rotor assembly from being separated from the stator assembly during rotation and does not hinder the rotation of the rotor assembly.
[0011] Optionally, the stator assembly further comprises a stator shell arranged at the outermost side of the stator assembly, the rotor shell is arranged around the outside of the stator shell, and at least one of the rotor shell and the stator shell is provided with a protrusion supported between the rotor shell and the stator shell. In this way, in the case of bearingless connection between the stator assembly and the rotor assembly, the gap and coaxiality between the rotor shell and the stator shell can be ensured by the protrusion, and the amount of shaking of the rotor assembly during rotation is reduced.
[0012] Optionally, the protrusion is arranged as an annular protrusion extending around the rotation shaft of the rotor assembly, and the protrusion is supported between the rotor shell and the stator shell in the circumferential direction of 360°. The protrusion can ensure the gap and coaxiality between the rotor shell and the stator shell, and reduce the amount of shaking of the rotor assembly during rotation.
[0013] Optionally, the protrusion is made of self-lubricating material. In this way, the friction during rotation of the rotor assembly can be reduced, and the wear of the protrusion can also be reduced, prolonging the service life.
[0014] Optionally, the rotor shell is provided with the protrusion, and the rotor shell and the protrusion are arranged in an integrated structure and are made of self-lubricating material; and / or
[0015] The stator shell is provided with the protrusion, and the stator shell and the protrusion are arranged in an integrated structure and are made of self-lubricating material. The protrusion does not need to be separately processed, and the manufacturing process is simple and convenient.
[0016] Optionally, the stator assembly further comprises a stator shell arranged at the outermost side of the stator assembly, the rotor shell is arranged around the outside of the rotor shell, and the side surface of the rotor shell facing the stator shell is provided with non-magnetic material, and / or the side surface of the stator shell facing the rotor shell is provided with non-magnetic material. The non-magnetic material can reduce the magnetic attraction between the rotor assembly and the stator assembly, and prevent the rotor assembly and the stator assembly from contacting and causing magnetic short circuit.
[0017] Optionally, the stirring part comprises a blade with a blade part or a spoiler without a blade part. The blade can whip and crush food materials, and the spoiler can stir food materials to meet different needs.
[0018] A food processor comprises:
[0019] A cup body is provided with a stirring cavity;
[0020] The brushless outer rotor motor as claimed in any one of the preceding claims is arranged in the stirring cavity, and the stator assembly is sealingly combined with the cup body. The motor structure is novel and has a stirring function.
[0021] Optionally, the cup body is further provided with a mounting hole, and the stator assembly comprises a stator housing, the bottom of the stator housing is provided with an annular flange protruding radially and extending circumferentially, the motor is mounted at the mounting hole, and the annular flange is sealingly combined with the cup body and the edge of the mounting hole. The annular flange can block the edge of the mounting hole, thereby increasing the reliability of the sealing. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 is a schematic view of the motor shown in an exemplary embodiment of the present application;
[0023] Figure 2 is a cross-sectional view of the motor shown in Figure 1
[0024] Figure 3 is a cross-sectional view of the motor shown in Figure 1
[0025] Figure 4 is an exploded view of the motor shown in Figure 1
[0026] Figure 5 is a partial enlarged view of the gap between the rotor housing and the stator housing of the motor;
[0027] Figure 6 is a schematic view of another embodiment of the rotor assembly;
[0028] Figure 7 is a schematic view of part of the structure of the food processor shown in an exemplary embodiment of the present application. DETAILED DESCRIPTION
[0029] The technical solutions in the embodiments (or “modes of implementation”) of the present application will be described clearly and completely in conjunction with the accompanying drawings. In the following description, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.
[0030] If the application embodiments involve terms of direction indication or position relationship (for example, up, down, left, right, front, back, inner, outer, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative position relationship, motion condition, etc. between components in a certain specific posture (as shown in the drawings); if the specific posture changes, the direction indication or position relationship will also change accordingly. In addition, the terms "first", "second", etc. in the application embodiments are only used for convenience of description, and cannot be understood as indicating or implying relative importance.
[0031] Please refer to Figure 1 and Figure 2 , Figure 1 The schematic diagram of the motor 100 shown in an exemplary embodiment of the application. Figure 2 The cross-sectional view of the motor 100 shown in Figure 1 .
[0032] The application provides a motor 100, which comprises a stator assembly 10 and a rotor assembly 20, the rotor assembly 20 is arranged around the outside of the stator assembly 10 and can rotate relative to the stator assembly 10, the motor 100 is an internal stator motor, and the rotation axis O of the rotor assembly 20 is coaxial with the axis of the stator assembly 10.
[0033] The stator assembly 10 comprises a stator housing 11 and a stator core 12 fixedly installed on the stator housing 11, and the stator core 12 can be stacked by multiple layers of magnetic punching sheets, including but not limited to silicon steel sheets.
[0034] The outer diameter of the rotor assembly 20 is set to 20-60mm, the axial length of the stator core 12 is set to 10-50mm, and the ratio of the outer diameter of the rotor assembly 20 to the axial length of the stator core is 0.4-6. In this scheme, the outer diameter of the rotor assembly 20 is relatively small, based on which the axial length of the stator core 12 is moderately increased, the axial length of the stator core 12 is 10-50mm, and the ratio of the outer diameter of the rotor assembly 20 to the axial length of the stator core 12 is set to 0.4-6, so that the rated torque is moderately increased, and the rated torque of the motor 100 is ensured under the condition that the radial size of the motor 100 is small.
[0035] In a specific embodiment, the outer diameter of the rotor assembly 20 can be set to 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm or 60mm. The axial length of the stator core 12 is 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 50mm or 55mm.
[0036] In one embodiment, the stator assembly 10 and the rotor assembly 20 are detachably connected, which facilitates the maintenance and replacement of the stator assembly 10 and the rotor assembly 20, and reduces the maintenance cost of the motor 100.
[0037] In one embodiment, the rotor assembly 20 includes a rotor shell 21 located at the outermost side of the motor 100, and the rotor shell 21 is provided with a stirring part 22 extending in the radial direction. That is, the stirring part 22 is directly arranged on the rotor shell 21 of the motor 100, so that the stirring part 22 has a higher integration with the rotor assembly 20, the motor 100 has a novel structure, and the motor itself also has a whipping function.
[0038] Please refer to Figure 3 , Figure 3 is Figure 1 the exploded view of the motor 100 shown in FIG. 1.
[0039] In one embodiment, the stator assembly 10 and the rotor assembly 20 are connected through a bearing. Specifically, the motor 100 further includes a bearing 30, the rotor shell 21 is provided with a bearing hole 210, the stator shell 11 is provided with a shaft body 110, the inner ring of the bearing 30 is fixedly connected with the shaft body 110, and the outer ring of the bearing 30 is fixedly connected with the rotor shell 21 in the bearing hole 210. Figure 3 In the embodiment shown in FIG. 2, the middle area of the top of the rotor shell 21 is convex, and the inner side of the convex part is formed with the bearing hole 210. The top of the stator shell 11 is provided with the shaft body 110, and the stator assembly 10 and the rotor assembly 20 are rotatably connected through the bearing 30 at the top.
[0040] In one embodiment, the rotor assembly 20 can be sleeved on the outside of the stator assembly 10, and the relative position of the two can be maintained by magnetic attraction without bearing connection.
[0041] Please refer to Figure 4 , Figure 4 is an exploded view of the motor.
[0042] The rotor assembly 20 further includes a permanent magnet 23 encapsulated in the rotor shell 21, the stator core 12 is located in the magnetic field range of the permanent magnet 23, and the magnetic force of the permanent magnet 23 can act on the stator core 12. In this way, the magnetic field force of the permanent magnet 23 can generate an attractive force on the stator core 12, which can avoid the disengagement of the rotor assembly 20 from the stator assembly 10 during rotation, and will not hinder the rotation of the rotor assembly 20.
[0043] In one embodiment, the rotor shell 21 is internally provided with a cavity 211 (see FIG. 3). Figure 3), and the permanent magnets 23 are arranged in the cavity 211. The permanent magnets 23 are arranged in a plurality of gaps around the rotation shaft of the rotor assembly 20. The permanent magnets 23 can be sealed in the cavity 211 by the sealing ring 40, but are not limited thereto.
[0044] As shown in Figure 4 , the stator assembly 10 further comprises the stator winding 13 arranged in the slot of the stator core 12, and the stator winding 13 generates a rotating magnetic field when energized, which acts on the permanent magnets 23 to drive the rotor assembly 20 to rotate.
[0045] Please refer to Figure 5 , Figure 5 for a partial enlarged view of the sectional view of the motor 100.
[0046] In one embodiment, the rotor shell 21 is arranged around the outside of the stator shell 11, and at least one of the rotor shell 21 and the stator shell 11 is provided with a protrusion 50 supported between the rotor shell 21 and the stator shell 11. In this way, the gap and coaxiality between the rotor shell 21 and the stator shell 11 can be ensured by the protrusion 50 when the stator assembly 10 and the rotor assembly 20 are not connected by the bearing 30, and the amount of shaking of the rotor assembly 20 during rotation is reduced. The protrusion 50 can be arranged at least at two positions spaced 180° in the circumferential direction.
[0047] In an alternative embodiment, the protrusion 50 can include a first protrusion and a second protrusion arranged at intervals, and the first protrusion and the second protrusion are arranged 180° apart in the circumferential direction of the stator shell 11. In this embodiment, the protrusion 50 is arranged as an annular protrusion extending around the rotation shaft of the rotor assembly 20, and the protrusion is supported between the rotor shell 21 and the stator shell 11 in the circumferential direction of 360°. In this way, the radial gap between the rotor shell 21 and the stator shell 11 is uniform everywhere, and the coaxiality of the rotor assembly 20 and the stator assembly 10 is better. It should be noted that the protrusion 50 can be integrally arranged on the rotor shell 21, and can also be integrally arranged on the stator shell 11.
[0048] The protrusion 50 can be arranged in multiple groups, and the multiple groups of protrusions 50 are arranged at intervals in the direction of the rotation shaft of the rotor assembly 20 to ensure that the gap between the rotor shell 21 and the stator shell 11 is uniform in the entire axial direction, and the coaxiality is better. For example, the protrusion 50 can be arranged in two groups, respectively corresponding to the two ends of the axial direction of the rotor assembly 21 and the stator shell 11.
[0049] In one embodiment, the protrusion 50 can be made of self-lubricating material. In this way, the friction of the rotor assembly 20 can be reduced, and the wear of the protrusion 50 can also be reduced, thereby prolonging the service life. The self-lubricating material includes, but is not limited to, molybdenum disulfide, polyimide, nylon, polytetrafluoroethylene, etc.
[0050] In one embodiment, the rotor housing 21 is provided with the protrusion 50, and the rotor housing 21 and the protrusion 50 are arranged in an integrated structure and are made of self-lubricating material as a whole. In another embodiment, the stator housing 11 is provided with the protrusion 50, and the stator housing 11 and the protrusion 50 are arranged in an integrated structure and are made of self-lubricating material as a whole. In this way, the protrusion 50 does not need to be separately processed, and the manufacturing process is simple and convenient.
[0051] In one embodiment, the side of the rotor housing 21 facing the stator housing 11 is provided with non-magnetic material, and / or the side of the stator housing 11 facing the rotor housing 21 is provided with non-magnetic material. The non-magnetic material can reduce the magnetic attraction between the rotor assembly 20 and the stator assembly 10, and can avoid the contact and magnetic short circuit between the rotor assembly 20 and the stator assembly 10. The non-magnetic material includes, but is not limited to, plastic, non-ferrous metal, etc.
[0052] Please refer to Figure 6 , Figure 6 for another embodiment of the rotor assembly 20.
[0053] In one embodiment, the rotor housing 21 has a hollow structure, and the rotor assembly 20 is sleeved outside the stator assembly 10. The stirring part 22 includes a non-blade part, which is a turbulence body. The turbulence body can stir food materials, and can be applied to a dough mixer, a chef machine, an egg beater, but is not limited thereto. The shape of the turbulence body is not limited.
[0054] In the embodiment shown in Figure 1 , the stirring part 22 includes a blade part, which is a blade. The blade can stir and crush food materials, and can be applied to a meat grinder, a cell wall breaking machine, but is not limited thereto.
[0055] Please refer to Figure 7 , Figure 7 for a schematic view of part of the structure of the food processor 1 according to an exemplary embodiment of the present application.
[0056] The application also provides a food processor 1, which comprises the motor 100 described above. The food processor 1 further comprises a cup body 200 provided with a stirring cavity 201, and the bottom of the cup body 200 can be further provided with a mounting hole (not shown). The motor 100 is arranged in the stirring cavity 201 and mounted at the mounting hole, and the stator housing 11 is sealingly combined with the edge of the mounting hole. The food processor 1 can further comprise a cup cover covering the cup body 200.
[0057] In one embodiment, in combination with Figure 4 and Figure 7 The bottom of the stator housing 11 is provided with a circumferentially extending annular flange 111 protruding radially, which is sealingly combined with the edge of the mounting hole. The annular flange 111 can be sealingly combined with the edge of the mounting hole through a sealing ring, but is not limited thereto. The annular flange 111 can shield at the edge of the mounting hole, increasing the reliability of the sealing.
[0058] The above only describes the preferred embodiments of the application and is not intended to limit the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the scope of protection of the application.
Claims
1. A brushless outer rotor motor applied to a food processor, characterized in that, include: Stator assembly (10), including stator core (12); The rotor assembly (20) is arranged around the outside of the stator assembly (10). The rotor assembly (20) is rotatable. The outer diameter of the rotor assembly (20) is set to 20-60mm. The axial length of the stator core is set to 10-50mm. The ratio of the outer diameter of the rotor assembly (20) to the axial length of the stator core is 0.4 to 6.
2. A brushless external rotor electric motor according to claim 1, characterized in that The stator assembly (10) is detachably connected to the rotor assembly (20).
3. A brushless external rotor electric motor according to claim 1 or 2, characterized in that The rotor assembly (20) includes a rotor housing (21) located on the outermost side of the motor (100), and the rotor housing (21) is provided with a stirring section (22) extending radially.
4. A brushless external rotor electric motor according to claim 3, characterised in that, The rotor assembly (20) also includes a permanent magnet (23) encapsulated in the rotor housing (21). The stator core (12) is made of a magnetically conductive material and is located within the magnetic field range of the permanent magnet (23). The magnetic force of the permanent magnet (23) can act on the stator core (12).
5. A brushless external rotor electric motor according to claim 4, characterised in that, The stator assembly (10) further includes a stator housing (11) disposed on the outermost side of the stator assembly (10), and a rotor housing (21) is disposed around the outside of the stator housing (11). At least one of the rotor housing (21) and the stator housing (11) is provided with a protrusion (50), and the protrusion (50) is supported between the rotor housing (21) and the stator housing (11).
6. A brushless external rotor electric motor according to claim 5, characterised in that, The protrusion (50) is configured as an annular protrusion (50) that extends around the axis of rotation of the rotor assembly (20) and is supported at all points in the circumferential 360° direction between the rotor housing (21) and the stator housing (11).
7. A brushless external rotor electric motor as claimed in claim 6, characterised in that, The rotor housing (21) is provided with the protrusion (50), and the rotor housing (21) and the protrusion (50) are configured as an integral structure, made of a self-lubricating material; and / or The stator housing (11) is provided with the protrusion (50), and the stator housing (11) and the protrusion (50) are configured as an integral structure and are made of a self-lubricating material.
8. A brushless external rotor electric motor as claimed in claim 3, characterised in that, The stator assembly (10) further includes a stator housing (11) disposed on the outermost side of the stator assembly (10), and a rotor housing (21) surrounding the outer side of the rotor housing (21). The surface of the rotor housing (21) facing the stator housing (11) is provided with a non-magnetic material, and / or the surface of the stator housing (11) facing the rotor housing (21) is provided with a non-magnetic material; and / or The stirring part (22) includes a blade with a cutting edge or a turbulent fluid without a cutting edge.
9. A food processor, characterized in that, include: The cup body (200) is provided with a stirring chamber (201); The brushless external rotor motor (100) as described in any one of claims 1 to 8, wherein the brushless external rotor motor (100) is disposed in the stirring chamber (201), and the stator assembly (10) is sealed to the cup body.
10. The food processor of claim 9, wherein, The cup body (200) is further provided with a mounting hole, the stator assembly (10) comprises a stator shell (11), the bottom of the stator shell (11) is provided with an annular flange (111) which protrudes radially and extends circumferentially, the motor (100) is mounted at the mounting hole, and the annular flange (111) is sealingly combined with the edge of the mounting hole and the cup body (200).