An outer rotor motor

Abstract

The present invention provides an outer rotor motor, which includes a stator assembly, a rotor assembly and a waterproof component; the stator assembly includes a base formed with a shaft portion, the rotor assembly includes a housing formed with a water retaining portion, and the waterproof component includes a sliding member disposed on the shaft portion; the sliding member slides axially along the shaft portion, so that the gap between the sliding member and the water retaining portion changes; when the outer rotor motor is operating, the gap between the sliding member and the water retaining portion is large, which can timely dissipate the heat generated by the stator winding and meet the heat dissipation requirements; under the action of the centrifugal force and the negative pressure generated by the housing, the outside water cannot enter the interior of the outer rotor motor; when the outer rotor motor is stationary, the gap between the sliding member and the water retaining portion is small, which meets the waterproof requirements; a thermal expansion member is disposed between the limiting member and the sliding member, and an elastic member is disposed between the sliding member and the mounting portion; when the internal temperature of the outer rotor motor changes, the thermal expansion member and the elastic member deform and drive the sliding member to slide, so that the gap between the sliding member and the water retaining portion changes.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to an outer rotor motor. Background Art

[0002] The outer rotor motor includes a base, a stator assembly and an outer rotor assembly. The stator assembly is arranged on the base. The outer rotor assembly includes a housing and a rotor shaft. The housing is sleeved outside the stator assembly, and there is a certain gap between the housing and the base. The rotor shaft is connected to the base through a bearing. In the prior art, the gap between the housing and the base is not adjustable, resulting in that when the motor is in different states, the requirements of heat dissipation and waterproofing cannot be satisfied simultaneously, which limits the application range of the outer rotor motor. When the motor is running, the gap between the housing and the base is small, and the heat dissipation performance is low. The heat generated by the stator winding cannot be dissipated in time, resulting in a large temperature rise of the motor and reducing the motor performance. When the motor is stationary, the gap between the housing and the base is large, and the waterproof performance is low. Water under the spraying condition will enter the interior of the motor, causing damage to the internal parts of the motor. Summary of the Invention

[0003] In view of this, the present invention provides an outer rotor motor to solve the problems in the prior art that the gap between the housing and the base is not adjustable, resulting in that the outer rotor motor cannot satisfy the requirements of heat dissipation and waterproofing simultaneously and has a narrow application range.

[0004] The present invention provides an outer rotor motor, including:

[0005] A stator assembly, including a base, the base including a mounting portion and a shaft portion formed on the mounting portion;

[0006] A rotor assembly, including a housing surrounding the outside of the shaft portion, and a water blocking portion formed at one end of the housing facing the mounting portion;

[0007] A waterproof assembly, arranged between the housing and the shaft portion and including a sliding member, the sliding member being slidably arranged on the shaft portion and located between the water blocking portion and the mounting portion;

[0008] The sliding member can slide axially along the shaft portion, so that the gap between the sliding member and the water blocking portion changes, and further the heat dissipation capacity and waterproof capacity of the outer rotor motor change.

[0009] Further optionally, the waterproof assembly further includes a thermal expansion member arranged on the shaft portion; when the thermal expansion member expands, it can push the sliding member to slide axially along the shaft portion.

[0010] Further optionally, the waterproof component further includes a limiting member disposed on the shaft portion, and the limiting member and the sliding member are oppositely disposed on both sides of the thermal expansion member, so that when the internal temperature of the external rotor motor rises, the thermal expansion member can expand toward one end of the sliding member and drive the sliding member to slide.

[0011] Further optionally, the limiting member forms a limiting cavity, one end of the limiting cavity facing the thermal expansion member is open, and one end of the limiting cavity away from the thermal expansion member is closed; the limiting cavity surrounds the outside of the thermal expansion member.

[0012] Further optionally, the sliding member, the thermal expansion member, the limiting member and the limiting cavity are all annular structures, and the sliding member, the thermal expansion member and the limiting member are all sleeved on the shaft portion and are coaxially arranged with the shaft portion.

[0013] Further optionally, the waterproof component further includes an elastic member, and the elastic member is disposed between the sliding member and the mounting portion;

[0014] When the internal temperature of the external rotor motor rises, the thermal expansion member expands and drives the sliding member to slide, the gap between the sliding member and the water blocking portion increases, and the elastic member is compressed and stores energy;

[0015] When the internal temperature of the external rotor motor drops, the thermal expansion member contracts, the elastic member releases energy and drives the sliding member to slide, and the gap between the sliding member and the water blocking portion decreases.

[0016] Further optionally, the shaft portion forms a limiting step, and the limiting step is located between the sliding member and the mounting portion;

[0017] When the thermal expansion member expands and drives the sliding member to slide, when the sliding member contacts the limiting step, the limiting step can limit the sliding member from continuing to move.

[0018] Further optionally, the sliding member forms a sealing cavity, one end of the sealing cavity facing the thermal expansion member is open, and one end of the sealing cavity away from the thermal expansion member is closed, and the sealing cavity surrounds the outside of the thermal expansion member;

[0019] The side portion of the sealing cavity and the water blocking portion are both annular structures and are both coaxially arranged with the shaft portion, and the side portion of the sealing cavity surrounds the inside of the water blocking portion.

[0020] Further optionally, the axial length of the water blocking portion is m, and the axial sliding distance of the sliding member is n, where m > n.

[0021] Further optionally, the stator assembly further includes a skeleton, a stator core and a winding; along the axial direction of the shaft portion, the skeleton, the limiting member, the thermal expansion member and the sliding member are sequentially arranged on the shaft portion; the stator core is arranged on the skeleton, and the winding is wound around the stator core; the housing surrounds the outside of the stator core;

[0022] The rotor assembly further includes a rotor shaft and a magnetic ring. The shaft portion is formed with a shaft hole, the rotor shaft is rotatably sleeved in the shaft hole, and one end of the rotor shaft is fixedly connected to one end of the housing; the magnetic ring is arranged on the inner wall surface of the housing.

[0023] Compared with the prior art, the beneficial effects of the present invention mainly lie in:

[0024] (1) The sliding member can slide along the shaft portion, thereby adjusting the gap between the sliding member and the water blocking portion; when the outer rotor motor is running, the gap between the sliding member and the water blocking portion is large, and the heat dissipation capacity is strong, and the heat generated by the stator winding can be dissipated in time, reducing the temperature rise of the motor, ensuring the reliable operation of the outer rotor motor, and meeting the heat dissipation requirements; at the same time, under the action of the centrifugal force and the negative pressure generated by the housing, the outside water cannot enter the inside of the outer rotor motor, meeting the IPX5 waterproof requirement; when the outer rotor motor is stationary, the stator winding does not generate heat and no heat dissipation is required. The gap between the sliding member and the water blocking portion is small, and the waterproof ability is strong. The water under the water spraying condition cannot enter the inside of the outer rotor motor, meeting the IPX5 waterproof requirement;

[0025] (2) The structure is simple and the assembly is convenient. The labyrinth structure is cancelled, reducing the material cost; when the outer rotor motor is in different states, it can meet the heat dissipation and waterproof requirements at the same time. While realizing efficient heat dissipation, it can prevent water from entering the inside of the outer rotor motor and causing damage to the internal parts of the motor; enabling the outer rotor motor to be used in more places with high waterproof grade requirements, expanding the scope of use and improving the user experience;

[0026] (3) A thermal expansion member is arranged between the limiting member and the sliding member, and an elastic member is arranged between the sliding member and the mounting portion; when the internal temperature of the outer rotor motor rises, the thermal expansion member expands and drives the sliding member to slide, so that the gap between the sliding member and the water blocking portion gradually increases, improving the heat dissipation capacity. Furthermore, the heat inside the motor can be quickly discharged, extending the service life of the motor and avoiding the problem that the heat inside the outer rotor motor cannot be discharged in time during operation, resulting in a reduction in motor performance; when the internal temperature of the outer rotor motor drops, the thermal expansion member contracts, and the elastic member drives the sliding member to slide, and the gap between the sliding member and the water blocking portion gradually decreases, improving the waterproof ability. Furthermore, it can prevent the outside water from entering the motor interior, avoiding the water under the water spraying condition from entering the motor interior when the outer rotor motor is stationary and causing potential safety hazards;

[0027] (4) A limiting step is formed on the shaft portion. When the sliding member contacts the limiting step, the limiting step can limit the continuous movement of the sliding member, avoiding excessive clearance between the sliding member and the water-blocking portion, which may cause the outer-rotor motor to fail to meet the IPX5 waterproof requirement during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0029] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention.

[0030] Figure 1 It is a schematic assembly structure diagram of an outer-rotor motor embodiment provided by the present invention;

[0031] Figure 2 It is an exploded structure diagram of an outer-rotor motor embodiment provided by the present invention;

[0032] Figure 3 It is a schematic cross-sectional structure diagram of an outer-rotor motor embodiment provided by the present invention;

[0033] Figure 4 It is Figure 3 an enlarged view of part A in

[0034] In the figure:

[0035] 1 - stator assembly; 11 - base; 111 - mounting portion; 112 - shaft portion; 113 - bearing; 114 - limiting boss; 115 - shaft hole; 12 - skeleton; 13 - stator core; 14 - wire outlet hole;

[0036] 2 - rotor assembly; 21 - housing; 211 - water-blocking portion; 22 - rotor shaft;

[0037] 3 - waterproof assembly; 31 - limiting member; 32 - thermal expansion member; 33 - sliding member; 34 - elastic member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The following specific embodiments illustrate the implementation manners of the present invention. Persons familiar with this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0039] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Plural" generally includes at least two, but does not exclude the case of including at least one.

[0040] It should be understood that the term "and / or" used herein is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, m and / or n can represent: m exists alone, m and n exist simultaneously, and n exists alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0041] It should also be noted that the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a commodity or system including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such commodity or system. Without further limitation, the element defined by the statement "including one..." does not exclude the existence of another identical element in the commodity or system including the said element.

[0042] In existing outer-rotor motors, the gap between the outer shell and the base cannot be adjusted, resulting in the inability to simultaneously meet the heat dissipation and waterproof requirements when the motor is in different states, which limits the application range of the outer-rotor motor; when the motor is running, the gap between the outer shell and the base is small, the heat dissipation performance is low, and the heat generated by the stator winding cannot be dissipated in time, resulting in a large temperature rise of the motor and a reduction in motor performance; when the motor is stationary, the gap between the outer shell and the base is large, the waterproof performance is low, and water under the water spraying condition will enter the interior of the motor, causing damage to the internal parts of the motor.

[0043] The present invention creatively provides an outer-rotor motor, including a stator assembly, a rotor assembly and a waterproof component; the stator assembly includes a base, and the base includes a shaft portion; the rotor assembly includes an outer shell, the outer shell surrounds the outside of the shaft portion and a water-blocking portion is formed at one end of the outer shell; the waterproof component includes a sliding member, and the sliding member is arranged on the shaft portion; the sliding member slides axially along the shaft portion, and thus the gap between the sliding member and the water-blocking portion changes;

[0044] When the outer rotor motor is running, the gap between the sliding member and the water retaining portion is large, and the heat dissipation capacity is strong. The heat generated by the stator winding can be dissipated in time to meet the heat dissipation requirements. At the same time, under the action of the centrifugal force and the negative pressure generated by the housing, the outside water cannot enter the interior of the outer rotor motor, meeting the IPX5 waterproof requirement. When the outer rotor motor is stationary, the gap between the sliding member and the water retaining portion is small, and the waterproof capacity is strong, meeting the IPX5 waterproof requirement.

[0045] <Overall structure>

[0046] As Figure 1 shown, this embodiment provides an outer rotor motor, including a stator assembly 1, a rotor assembly 2, and a waterproof assembly 3: The stator assembly 1 includes a base 11, a skeleton 12, a stator core 13, and windings. The base 11 includes a mounting portion 111 and a shaft portion 112 formed on the mounting portion 111. The skeleton 12 is provided at one end of the shaft portion 112, the stator core 13 is provided on the skeleton 12, and windings are wound around the periphery of the stator core 13. The shaft portion 112 is formed with a shaft hole 115, and a bearing 113 is provided at each end of the shaft hole 115 along the axial direction of the shaft portion 112.

[0047] The rotor assembly 2 includes a housing 21, a rotor shaft 22, and a magnetic ring. The housing 21 surrounds the outside of the stator core 13. The magnetic ring is provided on the inner wall surface of the housing 21 and the position of the magnetic ring corresponds to the position of the stator core 13. The rotor shaft 22 is rotatably provided in the shaft hole 115 and is connected to the shaft hole 115 through the bearing 113. One end of the rotor is fixedly connected to one end of the housing 21. When the stator core 13 drives the housing 21 to rotate, the rotor shaft 22 rotates relative to the shaft portion 112. One end of the housing 21 facing the mounting portion 111 is formed with a water retaining portion 211 for preventing outside water from entering the interior of the outer rotor motor. Specifically, the housing 21 is an overall cylindrical structure.

[0048] The waterproof assembly 3 is provided between the housing 21 and the shaft portion 112 and includes a sliding member 33. The sliding member 33 is slidably provided at the other end of the shaft portion 112 and is located between the water retaining portion 211 and the mounting portion 111. An outlet hole 14 is formed on the sliding member 33, and the lead wire of the winding is led out through the outlet hole 14.

[0049] The sliding member 33 can slide along the axial direction of the shaft portion 112, so that the gap between the sliding member 33 and the water retaining portion 211 changes, and thus the heat dissipation capacity and the waterproof capacity of the outer rotor motor change.

[0050] In summary, when the outer rotor motor is running, the gap between the sliding member 33 and the water retaining portion 211 is large, and the heat dissipation capacity is strong. The heat generated by the stator winding can be dissipated in a timely manner, reducing the temperature rise of the motor and ensuring the reliable operation of the outer rotor motor to meet the heat dissipation requirements. At the same time, under the action of the centrifugal force and the negative pressure generated by the housing 21, the outside water cannot enter the interior of the outer rotor motor, meeting the IPX5 waterproof requirement. When the outer rotor motor is stationary, the stator winding does not generate heat and there is no need for heat dissipation. The gap between the sliding member 33 and the water retaining portion 211 is small, and the waterproof capacity is strong. The water under the water spraying condition cannot enter the interior of the outer rotor motor, meeting the IPX5 waterproof requirement.

[0051] It has a simple structure and is convenient for assembly. The labyrinth structure is cancelled, reducing the material cost. When the outer rotor motor is in different states, it can meet the heat dissipation and waterproof requirements at the same time. While achieving efficient heat dissipation, it avoids water entering the interior of the outer rotor motor and causing damage to the internal parts of the motor. This enables the outer rotor motor to be used in more places with high waterproof grade requirements, expanding the scope of use and enhancing the user experience.

[0052] <Sliding member and water retaining portion>

[0053] As Figure 2 、 Figure 3 and Figure 4 shown, the sliding member 33 forms a sealing cavity. One end of the sealing cavity facing the thermal expansion member 32 is open, and the end of the sealing cavity away from the thermal expansion member 32 is closed. The end of the sealing cavity surrounds the outside of the thermal expansion member 32.

[0054] The sliding member 33, the water retaining portion 211, and the side portion of the sealing cavity are all annular structures and are coaxially arranged with the shaft portion 112. The side portion of the sealing cavity surrounds the inside of the water retaining portion 211. In some other embodiments, the side portion of the sealing cavity may also surround the outside of the water retaining portion 211. There is a clearance fit between the side portion of the sealing cavity and the water retaining portion 211, enabling the housing 21 to rotate relative to the sliding member 33 when the outer rotor motor is running.

[0055] When the internal temperature of the outer rotor motor rises, the thermal expansion member 32 deforms and drives the sliding member 33 to slide, and then the gap between the side portion of the sealing cavity and the water retaining portion 211 increases, improving the heat dissipation capacity of the outer rotor motor.

[0056] <Thermal expansion member and limiting member>

[0057] As Figure 2 、 Figure 3 and Figure 4 shown, the waterproof assembly 3 further includes a thermal expansion member 32, and the thermal expansion member 32 is arranged on the shaft portion 112. The thermal expansion member 32 can deform with the change of the ambient temperature where it is located. When the thermal expansion member 32 expands, it can push the sliding member 33 to slide axially along the shaft.

[0058] Specifically, the thermal expansion member 32 is of an annular structure, sleeved on the shaft portion 112 and coaxially arranged with the shaft portion 112; the thermal expansion member 32 is not limited to a certain material, and is flexibly selected comprehensively considering conditions such as the coefficient of thermal expansion and material cost;

[0059] When the outer rotor motor operates, the internal temperature of the outer rotor motor increases, the thermal expansion member 32 expands and drives the sliding member 33 to slide in a preset direction. The gap between the sliding member 33 and the water blocking portion 211 gradually increases, the heat dissipation space increases, the heat exchange area between the air and the stator core 13 is enlarged, the heat dissipation capacity is improved, which is beneficial to the rapid dissipation of the internal heat of the outer rotor motor, improves the heat exchange efficiency, prolongs the service life of the motor, and avoids the problem that the performance of the motor is reduced due to the failure to timely discharge the internal heat of the motor when the outer rotor motor operates; the rotation of the housing 21 generates centrifugal force, preventing external water from entering the inner part of the outer rotor motor, meeting the IPX5 waterproof requirement;

[0060] When the outer rotor motor is stationary, the internal temperature of the outer rotor motor decreases, the thermal expansion member 32 contracts, and the sliding member 33 slides in a direction opposite to the preset direction under the action of another driving member. The gap between the sliding member 33 and the water blocking portion 211 gradually decreases, improving the waterproof ability, preventing external water from entering the inner part of the outer rotor motor, meeting the IPX5 waterproof requirement, and avoiding potential safety hazards caused by water entering the motor under the water spraying condition when the outer rotor motor is stationary; the preset direction is along the axial direction of the shaft portion 112 towards the mounting portion 111;

[0061] In some other embodiments, instead of driving the sliding member 33 to slide through the expansion of the thermal expansion member 32, the sliding member 33 is driven to move manually; specifically, a buckle is formed on the sliding member 33, and a first card slot and a second card slot are formed on the housing 21; when the outer rotor motor operates, the buckle is engaged with the first card slot, so that the gap between the sliding member 33 and the water blocking portion 211 is large, meeting the heat dissipation requirement; when the outer rotor motor is stationary, the buckle is engaged with the second card slot, so that the gap between the sliding member 33 and the water blocking portion 211 is small, meeting the waterproof requirement;

[0062] In still other embodiments, instead of driving the sliding member 33 to slide through the expansion of the thermal expansion member 32, the sliding member 33 is driven to move by a permanent magnet, an electromagnet and a spring; specifically, a permanent magnet is arranged on the sliding member 33, an electromagnet is arranged on the mounting portion 111, and a spring is arranged between the sliding member 33 and the mounting portion 111; when the outer rotor motor operates, the electromagnet is energized, the electromagnet drives the permanent magnet to move, and the permanent magnet drives the sliding member 33 to slide, so that the gap between the sliding member 33 and the water blocking portion 211 increases, meeting the heat dissipation requirement; when the outer rotor motor is stationary, the electromagnet is powered off, and the spring drives the sliding member to slide, so that the gap between the sliding member 33 and the water blocking portion 211 decreases, meeting the waterproof requirement;

[0063] Preferably, the expansion of the thermal expansion member 32 drives the sliding member 33 to slide in a preset direction.

[0064] In view of the problem that the sliding member 33 cannot be effectively driven to slide in a preset direction when the thermal expansion member 32 deforms, this embodiment proposes that the waterproof assembly 3 further includes a limiting member 31, and the limiting member 31 is arranged on the shaft portion 112; the limiting member 31 and the sliding member 33 are relatively arranged on both sides of the thermal expansion member 32, so that when the internal temperature of the outer rotor motor rises, the thermal expansion member 32 can expand toward one end of the sliding member 33 and drive the sliding member 33 to slide;

[0065] Specifically, the limiting member 31 has an annular structure and can be an independent component or integrally formed with the shaft portion; when the limiting member 31 is an independent component, the limiting member 31 is sleeved on the shaft portion 112 and coaxially arranged with the shaft portion 112; the limiting member 31 is connected to the shaft portion 112 by interference fit or by screw connection;

[0066] The limiting member 31 enables the thermal expansion member 32 to expand toward one end of the sliding member 33 and drive the sliding member 33 to slide when the internal temperature of the outer rotor motor rises, the sliding member 33 approaches the mounting portion 111, and the gap between the sliding member 33 and the water blocking portion 211 increases.

[0067] Furthermore, the limiting member 31 forms a limiting cavity. Specifically, the limiting cavity is an annular cavity, one end of the limiting cavity facing the thermal expansion member 32 is open, and one end of the limiting cavity away from the thermal expansion member 32 is closed; the end and side of the limiting cavity surround the outside of the thermal expansion member 32;

[0068] When the internal temperature of the outer rotor motor rises, the limiting cavity causes the side of the thermal expansion member 32 facing away from the limiting member 31 to deform.

[0069] <Elastic member and limiting boss>

[0070] As Figure 2 、 Figure 3 and Figure 4 shown, the waterproof assembly 3 further includes an elastic member 34, and the elastic member 34 is arranged between the sliding member 33 and the mounting portion 111;

[0071] When the internal temperature of the outer rotor motor rises, the thermal expansion member 32 expands and drives the sliding member 33 to slide, the gap between the sliding member 33 and the water blocking portion 211 gradually increases, and the elastic member 34 is compressed and stores energy;

[0072] When the internal temperature of the outer rotor motor drops, the thermal expansion member 32 contracts, the elastic member 34 releases energy and drives the sliding member 33 to slide, and the gap between the sliding member 33 and the water blocking portion 211 gradually decreases;

[0073] Specifically, the elastic member 34 can be the following two structures:

[0074] ① The elastic member 34 is a large spring. The large spring is sleeved outside the shaft portion 112 and is coaxially arranged with the shaft portion 112. When the thermal expansion member 32 expands and drives the sliding member 33 to slide, the large spring is compressed and stores energy; when the thermal expansion member 32 contracts, the large spring releases energy and drives the sliding member 33 to slide.

[0075] ② The elastic member 34 is a small spring. A plurality of small springs are arranged at intervals along the circumferential direction of the shaft portion 112. When the thermal expansion member 32 expands and drives the sliding member 33 to slide, the plurality of small springs are compressed and store energy; when the thermal expansion member 32 contracts, the plurality of small springs release energy and drive the sliding member 33 to slide.

[0076] In view of the problem that the gap between the sliding member 33 and the water blocking portion 211 is too large during the operation of the outer rotor motor, resulting in the inability to meet the waterproof requirements, in this embodiment, a limiting step is formed on the shaft portion 112, and the limiting step is located between the sliding member 33 and the mounting portion 111; specifically, the limiting boss 114 is a columnar structure and is coaxially arranged with the shaft portion 112.

[0077] When the thermal expansion member 32 expands and drives the sliding member 33 to slide in a preset direction, when the sliding member 33 contacts the limiting step, the limiting step can limit the continuous movement of the sliding member 33, avoiding the gap between the sliding member 33 and the water blocking portion 211 from being too large, resulting in the inability to meet the IPX5 waterproof requirements during the operation of the outer rotor motor.

[0078] Preferably, the axial length of the water blocking portion 211 is m, and the axial sliding distance of the sliding member 33 is n, where m > n.

[0079] Along the preset direction, a skeleton 12 is arranged at one end of the shaft portion 112, and a mounting portion 111 is arranged at the other end of the shaft portion 112; along the preset direction, the limiting member 31, the thermal expansion member 32, and the sliding member 33 are sequentially arranged on the shaft portion 112 and are located between the skeleton 12 and the mounting portion 111; the limiting boss 114 is formed on the shaft portion 112 and is located below the sliding member 33, and the elastic member 34 is arranged between the sliding member 33 and the mounting portion 111; when the outer rotor motor is in different states, it can simultaneously meet the heat dissipation and waterproof requirements, realizing efficient heat dissipation while preventing water from entering the interior of the outer rotor motor; expanding the application range of the outer rotor motor.

[0080] The above specifically shows and describes the exemplary embodiments of the present disclosure. It should be understood that the present disclosure is not limited to the detailed structures, settings, or implementation methods described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent settings included within the spirit and scope of the appended claims.

Claims

1. An outer rotor motor, characterized in that, Comprising: A stator assembly, including a base, the base including a mounting portion and a shaft portion formed on the mounting portion; A rotor assembly, including a housing surrounding the outside of the shaft portion, one end of the housing facing the mounting portion forming a water-blocking portion; A waterproof assembly, disposed between the housing and the shaft portion and including a thermal expansion member, a sliding member, and an elastic member, the thermal expansion member and the sliding member both being disposed on the shaft portion, the sliding member being located between the water-blocking portion and the mounting portion and the sliding member being slidable along the axial direction of the shaft portion; the elastic member being disposed between the sliding member and the mounting portion; When the internal temperature of the outer rotor motor rises, the thermal expansion member expands and drives the sliding member to slide, the gap between the sliding member and the water-blocking portion increases, and the elastic member is compressed and stores energy; When the internal temperature of the outer rotor motor drops, the thermal expansion member contracts, the elastic member releases energy and drives the sliding member to slide, and the gap between the sliding member and the water-blocking portion decreases; Thus, under the action of the thermal expansion member and the elastic member, the gap between the sliding member and the water-blocking portion changes, and further the heat dissipation capacity and waterproof capacity of the outer rotor motor change.

2. The external rotor motor according to claim 1, wherein The waterproof assembly further includes a limiting member disposed on the shaft portion; the limiting member and the sliding member are oppositely disposed on both sides of the thermal expansion member, so that when the internal temperature of the outer rotor motor rises, the thermal expansion member can expand toward one end of the sliding member and drive the sliding member to slide.

3. The outer rotor motor according to claim 2, wherein The limiting member forms a limiting cavity, one end of the limiting cavity facing the thermal expansion member is open, and one end of the limiting cavity away from the thermal expansion member is closed; the limiting cavity surrounds the outside of the thermal expansion member.

4. The outer rotor motor according to claim 3, characterized in that, The sliding member, the thermal expansion member, the limiting member, and the limiting cavity are all of annular structures, and the sliding member, the thermal expansion member, and the limiting member are all sleeved on the shaft portion and are all coaxially disposed with the shaft portion.

5. The outer rotor motor according to claim 2, characterized in that, The shaft portion forms a limiting step, and the limiting step is located between the sliding member and the mounting portion; When the thermal expansion member expands and drives the sliding member to slide, when the sliding member contacts the limiting step, the limiting step can limit the sliding member from continuing to move.

6. The outer rotor motor according to claim 5, characterized in that, The axial length of the water-blocking portion is m, and the axial sliding distance of the sliding member is n, where m > n.

7. The external rotor motor according to claim 5, characterized in that, The sliding member forms a sealing cavity, one end of the sealing cavity facing the thermal expansion member is open, and one end of the sealing cavity away from the thermal expansion member is closed, and the sealing cavity surrounds the outside of the thermal expansion member; The side portion of the sealing cavity and the water-blocking portion are both of annular structures and are both coaxially disposed with the shaft portion, and the side portion of the sealing cavity surrounds the inside of the water-blocking portion.

8. The outer rotor motor according to claim 6, characterized in that, The stator assembly further includes a skeleton, a stator core, and windings; along the axial direction of the shaft portion, the skeleton, the limiting member, the thermal expansion member, and the sliding member are sequentially disposed on the shaft portion; the stator core is disposed on the skeleton, and the windings are wound around the periphery of the stator core; the housing surrounds the outside of the stator core; The rotor assembly further includes a rotor shaft and a magnetic ring. The shaft portion is formed with a shaft hole, the rotor shaft is rotatably sleeved in the shaft hole, and one end of the rotor shaft is fixedly connected to one end of the housing; the magnetic ring is disposed on the inner wall surface of the housing.

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