Motor, fan assembly, and heating, ventilation and air conditioning device

Abstract

A motor, a fan assembly, and a heating, ventilation and air conditioning device. The motor comprises a rotor assembly (11), a stator assembly (12), at least one bearing (13), and at least one elastic body (14). The bearing (13) is connected to the rotor assembly (11) and a relative position therebetween is fixed. The elastic body is disposed between the bearing (13) and the stator assembly (12), serving to maintain the bearing (13) at the stator assembly (12) with a certain axial preloading force while reserving a certain compressible height.

Description

Motors, fan components and HVAC equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on February 5, 2024, with application number 202410165699.0 and application name “Motors, fan components and HVAC equipment”, the entire contents of which are incorporated by reference into this application.

[0003] This application claims priority to the Chinese patent application filed with the China Patent Office on February 5, 2024, with application number 202420282942.2 and application name “Motors, fan components and HVAC equipment”, the entire contents of which are incorporated by reference into this application.

[0004] This application claims priority to the Chinese patent application filed with the China Patent Office on February 5, 2024, with application number 202410165698.6 and application name “Motors, fan assemblies and HVAC equipment”, the entire contents of which are incorporated by reference into this application.

[0005] This application claims priority to the Chinese patent application filed with the China Patent Office on February 5, 2024, with application number 202420282236.8 and application name “Motors, fan assemblies and HVAC equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0006] The present application relates to the field of motor technology, and in particular to a motor, a fan assembly and HVAC equipment. Background Art

[0007] The indoor unit of a split air conditioner typically undergoes a drop test of the entire unit packaging. Different manufacturers have different drop height requirements, with the maximum drop height even reaching 1.5 meters. At such a high drop height, a large impact force is generated between the rotor and stator of the outer rotor motor. Bearings, as key components connecting the stator and rotor, are subject to this impact force. Because the rotor shaft is fixed to the inner ring of the bearing, the rotor and the bearing will flatten the elastomer until it impacts the stator bearing chamber, causing damage to the motor bearings and causing the motor to produce a large amount of bearing noise.

[0008] Application Contents

[0009] The present application aims to at least partially address one of the technical problems in the related art by providing an elastic member between the bearing and the stator assembly of a motor to reduce the impact between the bearing and the stator assembly when the motor falls, thereby preventing bearing damage when the motor falls.

[0010] The present application provides a motor, comprising: a rotor assembly, a stator assembly, at least one bearing and at least one elastomer, wherein the bearing is connected to the rotor assembly and their relative position is fixed, and an elastomer is provided between the bearing and the stator assembly, for maintaining the bearing on the stator assembly with a certain axial preload and retaining a certain compressible height.

[0011] The motor of this application has an elastic body disposed between the bearing and the stator assembly, which is used to retain the bearing in the stator assembly with a certain axial preload and maintain a certain compressible height. This provides a cushioning force when the motor falls, reducing the impact force between the bearing and the stator assembly and preventing damage to the bearing.

[0012] In some embodiments, the at least one bearing includes a first bearing and a second bearing, and the at least one elastomer includes a first elastomer and a second elastomer, the first elastomer elastically supports the first bearing, and the second elastomer elastically supports the second bearing.

[0013] In some embodiments, the supporting direction of the first bearing by the first elastic body is opposite to the supporting direction of the second bearing by the second elastic body.

[0014] In some embodiments, the first elastomer and the second elastomer have the same or different stiffnesses.

[0015] In some embodiments, the motor has an axial extension side and a non-axial extension side in the axial direction, the rotor shaft of the rotor assembly extends from the axial extension side, the first elastomer is closer to the axial extension side than the second elastomer, and the stiffness of the first elastomer is greater than or equal to the stiffness of the second elastomer.

[0016] In some embodiments, the first elastic body and the second elastic body are disposed between the first bearing and the second bearing.

[0017] In some embodiments, the stator assembly includes a bearing seat that can accommodate the first bearing and the second bearing, and a positioning protrusion is provided in the bearing seat. The elastomer is stopped between the first bearing and the positioning protrusion, and the second elastomer is stopped between the second bearing and the positioning protrusion.

[0018] In some embodiments, the minimum axial gap between the rotor assembly and the stator assembly is less than or equal to the compressible height of the first elastomer, and the minimum axial gap between the rotor assembly and the stator assembly is less than or equal to the compressible height of the second elastomer, so that the rotor assembly contacts the stator assembly under the action of an axial external force.

[0019] In some embodiments, the compressible height of the first elastic body and the compressible height of the second elastic body are the same or different.

[0020] In some embodiments, the compressible height of the elastic body is not less than 0.5 mm and not more than 3 mm.

[0021] In some embodiments, the preload force of the elastic body at the compressible height is not less than 10N and not more than 150N.

[0022] In some embodiments, the total gravity G1 of the rotor assembly and the bearing and the stiffness k of the elastic body satisfy: G1 / k≤0.25 mm.

[0023] In some embodiments, the motor is an outer rotor motor.

[0024] In some embodiments, a minimum axial gap between the rotor assembly and the stator assembly is less than or equal to the compressible height, so that the rotor assembly contacts the stator assembly under the action of an axial external force.

[0025] In some embodiments, the rotor assembly includes an end cover portion, the end cover portion is axially opposite to the first portion of the stator assembly, and a minimum axial gap between the end cover portion and the first portion is less than or equal to the compressible height.

[0026] In some embodiments, the first portion includes a bearing seat that can accommodate the at least one bearing, the bearing seat is axially opposite to the end cover portion, and the minimum axial gap is less than or equal to the compressible height; or, the first portion includes a first stator overmolding portion that wraps the stator core, the first stator overmolding portion is axially opposite to the end cover portion, and the minimum axial gap is less than or equal to the compressible height; or, the end cover portion includes a cover plate, the cover plate is axially opposite to the first portion, and the minimum axial gap is less than or equal to the compressible height; or, the end cover portion includes a first rotor overmolding portion, the first rotor overmolding portion is axially opposite to the first portion, and the minimum axial gap is less than or equal to the compressible height.

[0027] In some embodiments, the end cover portion has a first boss, the first boss is axially opposite to the first part, and the axial gap is less than or equal to the compressible height; or the first part has a second boss, the second boss is axially opposite to the end cover portion, and the axial gap is less than or equal to the compressible height.

[0028] In some embodiments, the boss is configured to be annular around the motor axis; or the boss is configured to be a plurality of bosses spaced apart around the motor axis.

[0029] In some embodiments, the rotor assembly includes a sleeve portion, the first portion of the stator assembly is disposed within the sleeve portion, the second portion of the stator assembly is axially opposite to the sleeve portion, and a minimum axial gap is less than or equal to the compressible height.

[0030] In some embodiments, the sleeve portion includes a second rotor overmolding portion that wraps the rotor core, the second rotor overmolding portion is axially opposite to the second part of the stator assembly, and the minimum axial gap is less than or equal to the compressible height; or, the second part includes a second stator overmolding portion connected to the first stator overmolding portion of the first part and extending out of the sleeve portion, the second stator overmolding portion is axially opposite to the sleeve, and the minimum axial gap is less than or equal to the compressible height.

[0031] In some embodiments, the end of the sleeve portion has a third boss, the third boss is axially opposite to the second portion, and the axial gap is less than or equal to the compressible height; or the second portion has a fourth boss, the fourth boss is axially opposite to the sleeve portion, and the axial gap is less than or equal to the compressible height.

[0032] In some embodiments, the boss is configured to be annular around the motor axis; or the boss is configured to be a plurality of bosses spaced apart around the motor axis.

[0033] The present application also provides a fan assembly, comprising an impeller and the aforementioned motor, wherein the rotor assembly is connected to the impeller.

[0034] In some embodiments, at least a portion of the rotor assembly is integrally formed with the impeller.

[0035] In some embodiments, the rotor assembly includes a rotor overmolded part, and the rotor overmolded part is integrally formed with the impeller.

[0036] In some embodiments, the total gravity G2 of the rotor assembly, the bearing, and the impeller and the stiffness k of the elastic body satisfy: G2 / k≤0.9 mm.

[0037] The present application also provides a HVAC device, comprising the motor described in any of the above embodiments; or comprising the fan assembly of any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] FIG1 is a cross-sectional view of a motor according to an embodiment of the present application.

[0039] FIG2 is a cross-sectional view of a motor according to another embodiment of the present application.

[0040] FIG3 is a cross-sectional view of a motor according to another embodiment of the present application.

[0041] FIG4 is a schematic diagram of the cooperation between the rotor assembly and the bearing of the motor according to an embodiment of the present application.

[0042] FIG5 is a schematic diagram of a stator of a motor according to an embodiment of the present application.

[0043] FIG6 is a schematic diagram of a rotor assembly in one direction according to an embodiment of the present application.

[0044] FIG7 is a schematic diagram of a rotor assembly according to an embodiment of the present application in another direction.

[0045] FIG8 is a schematic diagram of a rotor assembly according to an embodiment of the present application in yet another direction.

[0046] FIG9 is a cross-sectional view of a stator assembly according to another embodiment of the present application.

[0047] FIG10 is a schematic diagram of a stator assembly according to another embodiment of the present application.

[0048] FIG11 is a cross-sectional view of a rotor assembly according to another embodiment of the present application.

[0049] FIG12 is a schematic diagram of a rotor assembly according to another embodiment of the present application.

[0050] FIG13 is a cross-sectional view of a stator assembly according to another embodiment of the present application.

[0051] FIG14 is a schematic diagram of a stator assembly according to another embodiment of the present application.

[0052] FIG15 is a schematic diagram of a fan assembly according to an embodiment of the present application.

[0053] Figure numerals: fan assembly 100, motor 10, rotor assembly 11, end cover portion 11a, sleeve portion 11b, rotor overmolded part 111, first rotor overmolded portion 1111, second rotor overmolded portion 1112, rotor core 112, cover plate 113, rotor shaft 114, first boss 115, third boss 116, stator assembly 12, first part 12a, second part 12b, first stator overmolded portion 1211, second stator overmolded portion 1212, stator core 122, bearing seat 123, positioning protrusion 1231, bearing 13, first bearing 131, second bearing 132, elastomer 14, first elastomer 141, second elastomer 142, second boss 124, fourth boss 125, compressible height L1, minimum axial clearance L2, impeller 20. Modes for Carrying Out the Invention

[0054] This application aims to address the noise problem caused by bearing damage in external rotor motors used in air conditioners during drop tests of the internal or external units of split air conditioners. This solution prevents bearing damage by ensuring that the rotor assembly and stator assembly collide early during the drop test, preventing the motor from producing abnormal noise caused by bearing damage.

[0055] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0056] Motor 10 is often used as a component in related products. In many cases, it may fall from a height. For example, during product transportation or installation, motor 10 may fall from a height along with the product. Another example is when a related product undergoes a drop test, during which motor 10 may also fall from a height along with the product. In these situations, significant impact forces can be generated between the stator assembly 12 and bearing 13 of motor 10, potentially damaging the motor 10.

[0057] As shown in Figure 1, the present application provides a motor 10, including: a rotor assembly 11, a stator assembly 12, at least one bearing 13 and at least one elastomer 14. The bearing 13 is connected to the rotor assembly 11 and the relative position is fixed. The elastomer 14 is provided between the bearing 13 and the stator assembly 12, which is used to maintain the bearing 13 on the stator assembly 12 with a certain axial preload and retain a certain compressible height.

[0058] The motor 10 of the present application has an elastic member 14 disposed between the bearing 13 and the stator assembly 12. This member is used to retain the bearing 13 within the stator assembly 12 with a certain axial preload and maintain a certain compressible height. This provides a cushioning force when the motor 10 is dropped, reducing the impact force between the bearing 13 and the stator assembly 12, preventing damage to the bearing 13 and reducing noise.

[0059] The motor 10 of the present application can be used in related equipment, such as HVAC equipment. The motor 10 can be used, but not limited to, as a compressor motor or fan motor in HVAC equipment. For another example, the motor 10 of the present application can also be used in vehicles, such as a drive motor for a vehicle. For another example, the motor 10 of the present application can also be used in range hoods, such as a fan motor for a range hood. Of course, the motor 10 of the present application is not limited to the above-mentioned products, but can also be used in other products.

[0060] When the motor 10 undergoes a drop test, or when an axial external force pushes the rotor assembly 11 to displace axially relative to the stator assembly 12, the rotor assembly 11 will displace axially relative to the stator assembly 12. At the same time, the bearing 13 fixed relative to the rotor assembly 11 will compress the elastomer 14. The elastomer 14 provides a supporting force in the opposite direction of the residual compression, forming a buffer between the bearing 13 and the stator assembly 12, thereby reducing the impact force between the bearing 13 and the stator assembly 12, avoiding damage to the bearing 13, and reducing noise.

[0061] In the present application, the elastic body 14 may be, for example but not limited to, a wave pad, rubber, spring or other elastic structural member.

[0062] As shown in FIG1 , in some possible embodiments, at least one bearing 13 includes a first bearing 131 and a second bearing 132, and at least one elastic body 14 includes a first elastic body 141 and a second elastic body 142. The first elastic body 141 elastically supports the first bearing 131, and the second elastic body 142 elastically supports the second bearing 132. In this way, the two elastic bodies 14 can each provide support for one bearing 13.

[0063] As shown in FIG1 , in some embodiments, the first elastic body 141 supports the first bearing 131 in opposite directions to the second elastic body 142 supports the second bearing 132. The motor 10 includes a first direction and a second direction along the axis, where the first direction and the second direction are opposite directions along the axial direction. The first elastic body 141 provides support for the first bearing 131 in a first direction, and the second elastic body 142 provides support for the second bearing 132 in a second direction.

[0064] With such a double elastic body 14 structure, when the motor 10 falls from a height, whether it falls in the first direction or the second direction, there is an elastic body 14 between the bearing 13 and the bearing seat 123 to provide a buffer, thereby reducing the impact force on the bearing 13, avoiding damage to the bearing 13, and reducing noise.

[0065] Optionally, the first elastic body 141 and the second elastic body 142 are disposed between the first bearing 131 and the second bearing 132 .

[0066] As shown in Figure 1, in some possible embodiments, the stator assembly 12 includes a bearing seat 123 that can accommodate a first bearing 131 and a second bearing 132. A positioning protrusion 1231 is provided in the bearing seat 123. The elastomer 14 is stopped between the first bearing 131 and the positioning protrusion 1231, and the second elastomer 142 is stopped between the second bearing 132 and the positioning protrusion 1231.

[0067] In the present application, the positioning protrusion 1231 is used for axial positioning of the first bearing 131 and the second bearing 132. The positioning protrusion 1231 can be an annular boss or a plurality of protrusions spaced apart and arranged in an annular manner.

[0068] The first bearing 131 and the second bearing 132 are arranged on either side of the positioning protrusion 1231 along the axial direction of the motor 10. A first elastic body 141 and a second elastic body 142 are respectively arranged between the first bearing 131 and the positioning protrusion 1231, and between the second bearing 132 and the positioning protrusion 1231. When the motor 10 falls axially from a height, the first elastic body 141 can provide a buffer between the first bearing 131 and the positioning protrusion 1231 of the bearing seat 123, and the second elastic body 142 can provide a buffer between the second bearing 132 and the positioning protrusion 1231, thereby preventing damage to the bearing 13 of the motor 10 and reducing noise.

[0069] As shown in Figure 1 , in this application, the bearing seat 123 includes a sidewall and a positioning protrusion 1231 extending from the sidewall toward the rotating shaft of the motor 10. The bearing seat 123 and the rotating shaft cooperate to form two receiving slots. These two receiving slots are located on either side of the positioning protrusion 1231 along the axial direction of the motor 10 and are used to accommodate the first bearing 131 and the second bearing 132, respectively.

[0070] In some possible embodiments, the first elastic body 141 and the second elastic body 142 have the same stiffness. In this way, the elastic body 14 can effectively buffer the impact applied from the first direction or the second direction, ensuring the stability of the first bearing 131 and the first bearing 131, and preventing the impact from damaging the bearing 13 and causing noise during the operation of the motor 10.

[0071] In some other possible embodiments, the first elastic body 141 and the second elastic body 142 have different stiffnesses. This is especially true when different structures are connected to different sides of the motor 10 in the axial direction, for example, when an impeller 20 is connected to one end of the motor 10 in the axial direction, the impact transmitted to the motor 10 from the first direction and the second direction is different when an impact is applied. Therefore, by setting different stiffnesses, the stability of the motor 10 can be ensured.

[0072] For example, the motor 10 has an axial extension side and a non-axial extension side in the axial direction, the rotor shaft 114 of the rotor assembly 11 extends from the axial extension side, the first elastomer 141 is closer to the axial extension side than the second elastomer 142, and the stiffness of the first elastomer 141 is greater than or equal to the stiffness of the second elastomer 142.

[0073] 1 to 5 , the motor 10 in the present application may be an outer rotor motor 10 or an inner rotor motor 10 .

[0074] In one possible embodiment, the motor 10 may be an outer rotor motor 10. The stator assembly 12 may include a stator overmolding part, a stator core 122, and a bearing seat 123. The stator overmolding part may be arranged to surround the bearing seat 123 and wrap the stator core 122. The bearing seat 123 may be arranged to be tubular in shape and may accommodate the bearing 13 therein. The stator overmolding part may include a first stator overmolding part 1211 and a second stator overmolding part 1212. The first stator overmolding part 1211 may wrap the stator core 122 and be arranged in the rotor assembly 11. The first stator overmolding part 1211 may be combined with the stator core 122 to form the first part 12a of the stator assembly 12. The second positioning overmolding part is connected to the first stator overmolding part 1211. , and extends to be axially opposite to the sleeve portion 11b of the rotor assembly 11. The second stator overmolded portion 1212 can be configured as the second part 12b of the stator assembly 12; the rotor assembly 11 can include an end cover portion 11a and a sleeve portion 11b, etc. The rotor shaft 114 is passed through the bearing seat 123, the bearing 13 is arranged between the rotor shaft 114 and the bearing seat 123, the sleeve portion 11b surrounds the rotor shaft 114, the first part 12a of the stator assembly 12 is arranged between the rotor shaft 114 and the sleeve portion 11b, and the end cover portion 11a connects the rotor shaft 114 and the sleeve portion 11b. From another perspective, the rotor assembly 11 can also include a cover plate 113 and a rotor overmolded part, the rotor overmolded part includes a first rotor overmolded part 1111 and a second rotor overmolded part 1112, the first rotor overmolded part 1111 is connected to the cover plate 113 and is configured as an end cover part 11a, and the second rotor overmolded part 1112 wraps the rotor core 112 and is configured as a sleeve part 11b.

[0075] In some embodiments, the compressible height of the elastic body 14 is not less than 0.5 mm and not greater than 3 mm. Setting the compressible height of the elastic body 14 to be greater than or equal to 0.5 mm can provide sufficient support for the bearing 13. A compressible height of less than or equal to 3 mm can prevent the elastic body 14 from having an excessively large compressible height, resulting in a large buffer stroke and impacting other structures of the motor 10. For example, the compressible height of the elastic body 14 can be, but is not limited to, 0.5 mm, 0.8 mm, 1 mm, 1.7 mm, 2.5 mm, or 3 mm.

[0076] In some embodiments, the preload force of the elastic body 14 at the compressible height is greater than or equal to 10N and less than or equal to 150N. A preload force greater than or equal to 10N can provide sufficient support for the bearing 13 when the motor 10 falls; a preload force less than or equal to 150N can prevent excessive preload force from adversely affecting other components of the motor 10. Examples of preload forces include, but are not limited to, 10N, 30N, 50N, 80N, 130N, and 150N.

[0077] In some embodiments, the sum of the weight of the rotor assembly 11 and the weight of the bearing 13, G1, and the stiffness k of the elastomer 14 satisfy the following: G / k ≤ 0.25 mm. Alternatively, the total weight of the rotor assembly and the bearing, G1, and the stiffness k of the elastomer satisfy the following: G1 / k ≤ 0.25 mm. For example, G / k may be, but is not limited to, 0.005 mm, 0.02 mm, 0.06 mm, 0.1 mm, or 0.15 mm. This proportional relationship between the elastomer and rotor stiffness can reduce fluctuations in elastomer compression caused by vibration excitation during motor transportation, thereby preventing elastomer failure and damage due to prolonged transportation vibration excitation. Preferably, G1 / k can be set to no greater than 0.075. Furthermore, in conjunction with the aforementioned embodiment, the elastomer includes a first elastomer and a second elastomer. The stiffness of either the first elastomer or the second elastomer can satisfy this setting, or the stiffness of both the first elastomer and the second elastomer can satisfy this setting.

[0078] In conjunction with Figures 1 to 3, according to the motor 10 of the embodiment of the present application, the minimum axial clearance between the rotor assembly 11 and the stator assembly 12 is less than or equal to the compressible height, so that the rotor assembly 11 contacts the stator assembly 12 under the action of an axial external force. By setting the axial positioning of the subassembly 12 and the rotor assembly 11, a certain axial distance is maintained between the stator assembly 12 and the rotor assembly 11. The size of this axial distance allows the stator assembly 12 and the rotor assembly 11 to come into contact under the action of an external force, thereby preventing the bearing 13 from being subjected to an impact load. By setting the axial positioning of the subassembly 12 and the rotor assembly 11, a certain axial distance is maintained between the stator assembly 12 and the rotor assembly 11. The size of this axial distance allows the stator assembly 12 and the rotor assembly 11 to come into contact under the action of an external force, thereby preventing the bearing 13 from being subjected to an impact load.

[0079] In addition, the present application also provides another embodiment of a motor 10. In combination with the aforementioned embodiment, the minimum axial clearance between the rotor assembly 11 and the stator assembly 12 in the motor 10 is less than or equal to the compressible height, so that the rotor assembly 11 contacts the stator assembly 12 under the action of an axial external force. When the motor 10 undergoes a drop test, or when an axial external force pushes the rotor assembly 11 to displace axially relative to the stator assembly 12, the rotor assembly 11 will displace axially relative to the stator assembly 12, and at the same time, the bearing 13 fixed relative to the rotor assembly 11 will compress the elastomer 14. Before or at the same time as the displacement of the bearing 13 relative to the stator assembly 12 reaches the compressible height of the elastomer 14, the rotor assembly 11 will contact the stator assembly 12, thereby avoiding impact between the bearing 13 and the stator assembly 12, or reducing the impact force, thereby achieving the effect of avoiding damage to the bearing 13.

[0080] In combination with the aforementioned embodiments, the minimum axial gap between the rotor assembly 11 and the stator assembly 12 is less than or equal to the compressible height of the first elastic body 141; or, the minimum axial gap between the rotor assembly 11 and the stator assembly 12 is less than or equal to the compressible height of the second elastic body 142; or, the minimum axial gap between the rotor assembly 11 and the stator assembly 12 is less than or equal to the compressible height of the first elastic body 141, and the minimum axial gap between the rotor assembly 11 and the stator assembly 12 is less than or equal to the compressible height of the second elastic body 142. It is used to allow the rotor assembly 11 to contact the stator assembly 12 under the action of an axial external force. The compressible height of the first elastic body 141 and the compressible height of the second elastic body 142 may be the same or different.

[0081] In order to achieve a minimum axial gap between the stator assembly 12 and the rotor assembly 11 that is less than or equal to the compressible height, the present application includes but is not limited to the following implementation methods.

[0082] As shown in Figure 4, in the first embodiment of the present application, the rotor assembly 11 includes an end cover portion 11a, which is axially opposed to the first portion 12a of the stator assembly 12. The minimum axial gap between the end cover portion 11a and the first portion 12a is less than or equal to the compressible height. When the stator assembly 12 moves axially relative to the rotor assembly 11, the end cover portion 11a can contact the first portion 12a of the stator assembly 12, thereby preventing the relative displacement between the bearing 13 and the rotor assembly 11 from exceeding the compressible height of the elastomer 14 and preventing damage to the bearing 13. The rotor assembly 11 may include a sleeve portion 11b and an end cover portion 11a, and the end cover portion 11a may cover one end of the sleeve portion 11b. The stator assembly 12 may include a first portion 12a, which is disposed within the sleeve portion 11b and opposed to the end cover portion 11a.

[0083] The minimum axial clearance between any location on the inner side of the end cover portion 11a and the first portion 12a can be set to be no greater than the compressible height. Alternatively, the minimum axial clearance between a portion of the inner side of the end cover portion 11a and the first portion 12a can be set to be no greater than the compressible height, while the minimum axial clearance between other locations on the inner side of the end cover portion 11a and the first portion 12a can be set to be greater than the compressible height. This ensures that the minimum axial clearance between the end cover portion 11a and the first portion 12a is less than or equal to the compressible height, and that damage to the bearing 13 is avoided by the contact between the first boss 115 and the first portion 12a.

[0084] As shown in Figures 6 to 8 , the end cover 11a can also be configured with a first boss 115. The first boss 115 is axially opposed to the first portion 12a, and the axial clearance between the first boss 115 and the first portion 12a is set to be less than or equal to the compressible height. This prevents damage to the bearing 13 through contact between the first boss 115 and the first portion 12a. The first boss 115 on the end cover 11a can be symmetrical or asymmetrical about the axis of the motor 10. For example, if the first boss 115 on the end cover 11a is symmetrical about the axis of the motor 10, the first boss 115 can be configured in a ring shape around the axis of the motor 10. Alternatively, multiple first bosses 115 can be spaced apart around the axis of the motor 10. By symmetrically arranging the first bosses 115 about the axis of the motor 10, the stability of the stator assembly 12 relative to the rotor assembly 11 along the axis is maintained, preventing damage to the stator and rotor assemblies 12 and 11.

[0085] As shown in Figures 9 and 10, the first portion 12a can also be configured to have a second boss 124, with the second boss 124 axially opposed to the end cover portion 11a, and the axial clearance between the second boss 124 and the end cover portion 11a set to be less than or equal to the compressible height. In this way, the contact between the second boss 124 and the end cover portion 11a can prevent damage to the bearing 13. The second boss 124 of the first portion 12a can be configured to be symmetrical or asymmetrical about the axis of the motor 10, with the second boss 124 on the first portion 12a being configured to be symmetrical about the axis of the motor 10 as an example. The first boss 115 on the end cover portion 11a being configured to be symmetrical about the axis of the motor 10 is used as an example. In addition, the second boss 124 can be configured to be annular around the axis of the motor 10; the second boss 124 can also be configured to be multiple and spaced apart around the axis of the motor 10. By symmetrically arranging the second bosses 124 about the axis of the motor 10 , the stability of the stator assembly 12 moving relative to the rotor assembly 11 along the axial direction can be maintained, thereby avoiding damage to the stator assembly 12 and the rotor assembly 11 .

[0086] The end cover portion 11a is axially opposite to the first portion 12a of the stator assembly 12, and the minimum axial gap between the end cover portion 11a and the first portion 12a is less than or equal to the compressible height, including but not limited to the following examples:

[0087] In a first example, the first portion 12a includes a bearing seat 123 that accommodates at least one bearing 13. The bearing seat 123 is axially opposed to the end cover portion 11a, with a minimum axial clearance less than or equal to the compressible height. When the stator assembly 12 moves axially relative to the rotor assembly 11, the bearing seat 123 can contact the end cover portion 11a. Because the bearing 13 is disposed within the bearing seat 123, it provides better protection for the bearing 13.

[0088] Among them, the axial clearance between any point on the inner surface of the end cover portion 11a and the bearing seat 123 can be set to be no greater than the compressible height; the axial clearance between a part of the inner surface of the end cover portion 11a and the bearing seat 123 can also be set to be no greater than the compressible height, while the axial clearance between other positions of the inner surface of the end cover portion 11a and the bearing seat 123 can be set to be greater than the compressible height.

[0089] The end cover portion 11a may also be configured to include a first boss 115, with the first boss 115 axially opposed to the bearing seat 123, and the axial clearance between the first boss 115 and the bearing seat 123 set to be less than or equal to the compressible height. The first boss 115 may be configured in a ring shape around the axis of the motor 10, or may be configured to include multiple first bosses 115 spaced apart around the axis of the motor 10.

[0090] The bearing seat 123 may also be provided with a second boss 124, with the second boss 124 axially opposed to the end cover portion 11a, and the axial clearance between the second boss 124 and the end cover portion 11a being set to be less than or equal to the compressible height. The second boss 124 may be configured as an annular shape surrounding the axis of the motor 10, or as a plurality of second bosses 124 spaced apart around the axis of the motor 10.

[0091] In a second example, the first portion 12a includes a first stator overmolded portion 1211 that encases the stator core 122. The first stator overmolded portion 1211 is axially opposed to the end cover portion 11a, and the minimum axial gap therebetween is less than or equal to the compressible height. When the stator assembly 12 moves axially relative to the rotor assembly 11, the first stator overmolded portion 1211 can contact the end cover portion 11a. Because the first stator overmolded portion 1211 is a plastic component, a structure suitable for defining an axial gap between the first stator overmolded portion 1211 and the end cover portion 11a can be easily formed on the first stator overmolded portion 1211, thereby reducing the production cost of the motor 10. Moreover, even if the first stator overmolded portion 1211 and the end cover portion 11a come into contact, the plastic component can still provide a certain cushioning effect.

[0092] Among them, the axial gap between any point on the inner side surface of the end cover portion 11a and the first stator overmolded portion 1211 can be set to be no greater than the compressible height; the axial gap between a part of the inner side surface of the end cover portion 11a and the first stator overmolded portion 1211 can also be set to be no greater than the compressible height, while the axial gap between other positions on the inner side surface of the end cover portion 11a and the first stator overmolded portion 1211 can be set to be greater than the compressible height.

[0093] 6 to 8 , the end cover portion 11a may also be configured to include a first boss 115, with the first boss 115 axially opposed to the first stator overmolded portion 1211, and the axial clearance between the first boss 115 and the first stator overmolded portion 1211 set to be less than or equal to the compressible height. The first boss 115 may be configured in a ring shape around the axis of the motor 10, or may be configured to include multiple first bosses 115 spaced apart around the axis of the motor 10.

[0094] As shown in Figures 9 and 10 , the first stator overmolded portion 1211 may also be configured to include a second boss 124. The second boss 124 is axially opposed to the end cover portion 11a, and the axial clearance between the second boss 124 and the end cover portion 11a is set to be less than or equal to the compressible height. The second boss 124 may be configured in a ring shape around the axis of the motor 10, or may be configured as a plurality of second bosses 124 spaced apart around the axis of the motor 10.

[0095] In a third example, the end cover portion 11a includes a cover plate 113. The cover plate 113 is axially opposed to the first portion 12a, with a minimum axial gap less than or equal to the compressible height. When the stator assembly 12 moves axially relative to the rotor assembly 11, the first portion 12a can contact the cover plate 113. The cover plate 113 can be made of metal or a rigid plate. This contact between the cover plate 113 and the first portion 12a enhances the protective effect and further protects the bearing 13.

[0096] Among them, the axial gap between any point on the inner side surface of the cover plate 113 and the first part 12a can be set to be no greater than the compressible height; the axial gap between a part of the inner side surface of the cover plate 113 and the first part 12a can also be set to be no greater than the compressible height, and the axial gap between other positions on the inner side surface of the cover plate 113 and the first part 12a can be set to be greater than the compressible height.

[0097] The cover plate 113 may also be configured to include a first boss 115, with the first boss 115 axially opposed to the first portion 12a, and the axial clearance between the first boss 115 and the first portion 12a being set to be less than or equal to the compressible height. The first boss 115 may be configured in a ring shape around the axis of the motor 10, or may be configured to include multiple first bosses 115 spaced apart around the axis of the motor 10.

[0098] Alternatively, the first portion 12a may include a second boss 124, with the second boss 124 axially opposed to the cover plate 113, and the axial clearance between the second boss 124 and the cover plate 113 set to be less than or equal to the compressible height. The second boss 124 may be configured as a ring around the axis of the motor 10, or as a plurality of second bosses 124 spaced apart around the axis of the motor 10.

[0099] In a fourth example, the end cover portion 11a includes a first rotor overmolded portion 1111. The first rotor overmolded portion 1111 is axially opposed to the first portion 12a, with a minimum axial gap less than or equal to the compressible height. When the stator assembly 12 moves axially relative to the rotor assembly 11, the first portion 12a can contact the first rotor overmolded portion 1111. Because the first rotor overmolded portion 1111 is a plastic component, it is easy to form a structure on the first rotor overmolded portion 1111 that defines an axial gap with the end cover portion 11a, thereby reducing the production cost of the motor 10. Furthermore, even if the first rotor overmolded portion 1111 and the first portion 12a come into contact, the plastic component can still provide a certain cushioning effect.

[0100] Among them, the axial gap between any position of the inner side surface of the first rotor plastic-coated portion 1111 and the first part 12a can be set to be no greater than the compressible height; the axial gap between a part of the inner side surface of the first rotor plastic-coated portion 1111 and the first part 12a can also be set to be no greater than the compressible height, while the axial gap between other positions of the inner side surface of the first rotor plastic-coated portion 1111 and the first part 12a can be set to be greater than the compressible height.

[0101] As shown in Figure 6 , the first rotor overmolded portion 1111 can also be configured to include a first boss 115 , with the first boss 115 axially opposed to the first portion 12a, and the axial clearance between the first boss 115 and the first portion 12a set to be less than or equal to the compressible height. The first boss 115 can be configured in a ring shape around the axis of the motor 10 , or multiple first bosses 115 can be configured to be spaced apart around the axis of the motor 10 .

[0102] 5 and 10 , the first portion 12a may also be configured to include a second boss 124, with the second boss 124 axially opposed to the first rotor overmolded portion 1111, and the axial clearance between the second boss 124 and the first rotor overmolded portion 1111 set to be less than or equal to the compressible height. The second boss 124 may be configured in a ring shape around the axis of the motor 10, or may be configured as a plurality of second bosses 124 spaced apart around the axis of the motor 10.

[0103] In other implementations, the aforementioned methods may be combined, for example, the bearing seat 123 is axially opposed to the cover plate 113, and the minimum axial gap is less than or equal to the compressible height; and / or, the bearing seat 123 is axially opposed to the first rotor overmolded portion 1111, and the minimum axial gap is less than or equal to the compressible height; and / or, the first stator overmolded portion 1211 is axially opposed to the cover plate 113, and the minimum axial gap is less than or equal to the compressible height; and / or, the first stator overmolded portion 1211 is axially opposed to the first rotor overmolded portion 1111, and the minimum axial gap is less than or equal to the compressible height.

[0104] In conjunction with Figures 4 and 11 , in a second embodiment of the present application, the rotor assembly 11 includes a sleeve portion 11b, the first portion 12a of the stator assembly 12 is disposed within the sleeve portion 11b, the second portion 12b of the stator assembly 12 is axially opposed to the sleeve portion 11b, and the minimum axial gap is less than or equal to the compressible height. When the stator assembly 12 moves axially relative to the rotor assembly 11, the sleeve portion 11b can contact the second portion 12b of the stator assembly 12, thereby preventing the relative displacement between the bearing 13 and the rotor assembly 11 from exceeding the compressible height of the elastomer 14, thereby preventing damage to the bearing 13. The rotor assembly 11 may include an end cover portion 11a and a sleeve portion 11b, and the sleeve portion 11b may cover one end of the end cover portion 11a. The stator assembly 12 may include a first portion 12a disposed in the sleeve portion 11b and opposite to the end cover portion 11a; the stator assembly 12 may further include a second portion 12b extending out of the sleeve portion 11b and axially opposite to the sleeve portion 11b.

[0105] In order to achieve that the minimum axial clearance between the sleeve portion 11b and the second portion 12b is less than or equal to the compressible height, the minimum axial clearance between any point of the sleeve portion 11b and the second portion 12b can be set to be no greater than the compressible height; or the minimum axial clearance between a part of the sleeve portion 11b and the second portion 12b can be set to be no greater than the compressible height, while the minimum axial clearance between other positions of the sleeve portion 11b and the second portion 12b can be set to be greater than the compressible height.

[0106] Alternatively, as shown in Figure 12, the sleeve portion 11b may be configured with a third boss 116. The third boss 116 is axially opposed to the second portion 12b, and the axial clearance between the third boss 116 and the second portion 12b is configured to be less than or equal to the compressible height. This prevents damage to the bearing 13 through contact between the third boss 116 and the second portion 12b. The third boss 116 on the sleeve portion 11b can be symmetrical or asymmetrical about the axis of the motor 10. For example, the third boss 116 on the sleeve portion 11b can be configured to be symmetrical about the axis of the motor 10. Alternatively, the third boss 116 can be configured to be annular around the axis of the motor 10. Alternatively, the third boss 116 can be configured to be spaced apart and arranged in a plurality of spaces around the axis of the motor 10. By symmetrically arranging the third boss 116 about the axis of the motor 10, the stability of the stator assembly 12 relative to the rotor assembly 11 along the axis is maintained, preventing damage to the stator and rotor assemblies 12 and 11.

[0107] Furthermore, as shown in Figures 13 and 14 , the second portion 12b can also be configured with a fourth boss 125. The fourth boss 125 is axially opposed to the sleeve portion 11b, and the axial clearance between the fourth boss 125 and the sleeve portion 11b is set to be less than or equal to the compressible height. This prevents damage to the bearing 13 through contact between the fourth boss 125 and the sleeve portion 11b. The fourth boss 125 of the second portion 12b can be symmetrical or asymmetrical about the axis of the motor 10. For example, the fourth boss 125 on the second portion 12b can be configured to be symmetrical about the axis of the motor 10. Alternatively, the fourth boss 125 can be configured to be annular around the axis of the motor 10. Alternatively, the fourth boss 125 can be configured to be spaced apart and arranged in a plurality of spaces around the axis of the motor 10. By symmetrically arranging the fourth boss 125 about the axis of the motor 10, the stability of the stator assembly 12 relative to the rotor assembly 11 along the axis is maintained, preventing damage to the stator and rotor assemblies 12 and 11.

[0108] The second portion 12b of the stator assembly 12 is axially opposite to the sleeve portion 11b, and the minimum axial gap is less than or equal to the compressible height, including but not limited to the following examples:

[0109] In the first example, sleeve portion 11b includes a second rotor overmolded portion 1112 that encases rotor core 112. Second rotor overmolded portion 1112 and second portion 12b are axially opposed, with a minimum axial gap less than or equal to the compressible height. When stator assembly 12 moves axially relative to rotor assembly 11, second portion 12b can contact second rotor overmolded portion 1112. Because second rotor overmolded portion 1112 is a plastic component, it is easy to form a structure on second rotor overmolded portion 1112 that defines an axial gap with end cover portion 11a, reducing the production cost of motor 10. Furthermore, even if second rotor overmolded portion 1112 and second portion 12b come into contact, the plastic component can still provide a certain cushioning effect.

[0110] The axial clearance between any part of the second rotor plastic-coated portion 1112 and the second portion 12b can be set to be no greater than the compressible height; the axial clearance between a part of the second rotor plastic-coated portion 1112 and the second portion 12b can also be set to be no greater than the compressible height, while the axial clearance between other parts of the second rotor plastic-coated portion 1112 and the second portion 12b can be set to be greater than the compressible height.

[0111] As shown in Figures 11 and 12 , the second rotor overmolded portion 1112 can also be configured to include a third boss 116. The third boss 116 is axially opposed to the second portion 12b, and the axial clearance between the third boss 116 and the second portion 12b is set to be less than or equal to the compressible height. The third boss 116 can be configured as a ring around the axis of the motor 10, or as a plurality of third bosses 116 spaced apart around the axis of the motor 10.

[0112] As shown in Figures 13 and 14 , the second portion 12b may also be configured to include a fourth boss 125. The fourth boss 125 is axially opposed to the second rotor overmolded portion 1112, and the axial clearance between the fourth boss 125 and the second rotor overmolded portion 1112 is configured to be less than or equal to the compressible height. The fourth boss 125 may be configured in a ring shape around the axis of the motor 10, or may be configured as a plurality of fourth bosses 125 spaced apart around the axis of the motor 10.

[0113] In a second example, the second portion 12b includes a second stator overmolded portion 1212 connected to the first stator overmolded portion 1211 of the first portion 12a and extending beyond the sleeve portion 11b. The second stator overmolded portion 1212 is axially opposed to the sleeve portion, and the minimum axial gap is less than or equal to the compressible height. When the stator assembly 12 moves axially relative to the rotor assembly 11, the second stator overmolded portion 1212 can contact the sleeve portion 11b. Because the second stator overmolded portion 1212 is a plastic component, it is convenient to form a structure on the second stator overmolded portion 1212 that is suitable for defining an axial gap with the sleeve portion 11b, thereby reducing the production cost of the motor 10. Moreover, even if the second stator overmolded portion 1212 and the sleeve portion 11b come into contact, the plastic component can still provide a certain cushioning effect.

[0114] Among them, the axial gap between any part of the sleeve portion 11b and the second stator overmolded portion 1212 can be set to be no greater than the compressible height; the axial gap between a part of the sleeve portion 11b and the second stator overmolded portion 1212 can also be set to be no greater than the compressible height, while the axial gap between other positions of the sleeve portion 11b and the second stator overmolded portion 1212 can be set to be greater than the compressible height.

[0115] As shown in Figures 11 and 12 , the sleeve portion 11b may also be configured to include a third boss 116. The third boss 116 is axially opposed to the second stator overmolded portion 1212, and the axial clearance between the third boss 116 and the second stator overmolded portion 1212 is set to be less than or equal to the compressible height. The third boss 116 may be configured in a ring shape around the axis of the motor 10, or may be configured as a plurality of third bosses 116 spaced apart around the axis of the motor 10.

[0116] As shown in Figures 13 and 14 , the second stator overmolded portion 1212 can also be configured to include a fourth boss 125. The fourth boss 125 is axially opposed to the sleeve portion 11b, and the axial clearance between the fourth boss 125 and the sleeve portion 11b is set to be less than or equal to the compressible height. The fourth boss 125 can be configured as a ring around the axis of the motor 10, or as a plurality of fourth bosses 125 spaced apart around the axis of the motor 10.

[0117] In other examples, the aforementioned methods may be combined. For example, the second stator overmolded portion 1212 and the second rotor overmolded portion 1112 are axially opposed to each other, and the minimum axial gap is less than or equal to the compressible height.

[0118] In some embodiments of the present application, at least one bearing 13 includes a first bearing and a second bearing, and the stator assembly 12 includes a bearing seat 123 that can accommodate the first bearing and the second bearing. A positioning protrusion 1231 is provided in the bearing seat 123 to separate the first bearing and the second bearing, wherein an elastomer 14 is provided between the first bearing and the positioning protrusion 1231; an elastomer 14 can also be provided between the second bearing and the positioning protrusion 1231; an elastomer 14 can also be provided between the first bearing and the positioning protrusion 1231, and an elastomer 14 is provided between the second bearing and the positioning protrusion 1231.

[0119] In other embodiments of the present application, at least one bearing includes a first bearing and a second bearing, and the stator assembly 12 includes a bearing seat 123 that can accommodate the first bearing and the second bearing. A positioning protrusion 1231 is provided in the bearing seat 123 to separate the first bearing and the second bearing. Axially, the first bearing is arranged close to the rotor assembly, and an elastomer 14 is provided between the first bearing and the positioning protrusion 1231.

[0120] In some embodiments of the present application, the sum of the weight of the rotor assembly 11 and the weight of the bearing 13, G1, and the stiffness k of the elastomer 14 satisfy the following: G / k ≤ 0.25 mm. Alternatively, the sum of the weight of the rotor assembly and the bearing, G1, and the stiffness k of the elastomer satisfy the following: G1 / k ≤ 0.25 mm. For example, G / k may be, but is not limited to, 0.005 mm, 0.02 mm, 0.06 mm, 0.1 mm, or 0.15 mm. This proportional relationship between the elastomer and rotor stiffness can reduce fluctuations in elastomer compression caused by vibration excitation during motor transportation, thereby preventing elastomer failure and damage due to prolonged transportation vibration excitation. Preferably, G1 / k is set to no greater than 0.075. Furthermore, in conjunction with the aforementioned embodiments, the elastomer may include a first elastomer and a second elastomer, wherein the stiffness of either the first elastomer or the second elastomer may satisfy this setting, or the stiffness of both the first elastomer and the second elastomer may satisfy this setting.

[0121] 1 to 4 , the motor 10 of the present application includes a rotor assembly 11 , a stator assembly 12 , a first bearing, a second bearing, a first elastomer, and a second elastomer. The stator assembly 12 includes a bearing seat 123 in the center, which accommodates the first and second bearings. A positioning protrusion 1231 (which can be an annular boss or multiple spaced protrusions) is provided between the two bearing chambers 13 of the bearing seat 123 to separate the first and second bearings. A first elastomer is placed between the first bearing and the positioning protrusion 1231, and a second elastomer is placed between the second bearing and the positioning protrusion 1231. The inner rings of the first and second bearings are interference-fitted with the rotor shaft 114. Axial positioning is achieved by a retaining spring at the end of the rotor shaft 114 and the rotor overmolded component (also using two retaining springs). This positioning distance maintains the elastomer 14 within the bearing chamber 13 with a certain preload force and maintains a certain compressible height, i.e., the working height of the elastomer 14. The axial position of the rotor assembly 11 within the stator assembly 12 is set so that the minimum axial gap between the stator assembly 12 and the rotor assembly 11 is less than the working height of the elastomer 14. This ensures that under the action of a certain axial force, the rotor assembly 11 and the stator assembly 12 come into contact.

[0122] As shown in FIG15 , the present application further provides a fan assembly 100, which includes a motor 10 and an impeller 20, wherein the rotor assembly 11 of the motor 10 can be connected to the impeller 20, wherein the rotor assembly 11 of the motor 10 can be connected to the impeller 20 by welding, bonding, bolting, secondary injection molding, etc.; at least a portion of the impeller 20 can also be integrally formed with at least a portion of the rotor assembly 11, for example, the entire impeller 20 and the entire rotor assembly 11 are integrally formed; or, the entire impeller 20 and a portion of the rotor assembly 11 are integrally formed; or, a portion of the impeller 20 and the entire rotor assembly 11 are integrally formed; or, a portion of the impeller 20 and the entire rotor assembly 11 are integrally formed; or, a portion of the impeller 20 and a portion of the rotor assembly 11 are integrally formed. The impeller 20 and the rotor assembly 11 can be integrally formed by injection molding, vacuum molding, secondary injection molding, or overmolding, etc.

[0123] Among them, the rotor assembly 11 may include a rotor overmolding part 111, and the rotor overmolding part 111 may be configured to be integrally formed with the impeller 20. For example, the impeller 20 and the rotor overmolding part 111 may be integrally formed by injection molding, integrally formed by vacuum molding, integrally formed by secondary injection molding, or overmolding, etc. By configuring the rotor assembly 11 and the impeller 20 of the motor 10 as an integral structure, it is possible to conveniently drive the impeller 20 to rotate by the motor 10, so as to improve the driving efficiency of the impeller 20 by the motor 10. In addition, integrally forming the rotor overmolding part 111 and the impeller 20 can simplify the structure of the fan assembly 100 and improve the assembly efficiency of the fan assembly 100. Due to the integral molding method adopted by the rotor assembly 11 and the impeller 20, the structural strength of the connection between the rotor assembly 11 and the impeller 20 can be improved.

[0124] The motor can be the motor 10 described in the aforementioned embodiment, or any other motor known in the related art. Furthermore, in conjunction with the aforementioned embodiment, the motor 10 includes a rotor assembly 11, a stator assembly 12, at least one bearing 13, and at least one elastomer 14. The total weight G2 of the rotor assembly, the bearings, and the impeller 20, and the stiffness k of the elastomer satisfy the following relationship: G2 / k ≤ 0.9 mm. In other words, the sum of the weight of the rotor assembly, the weight of the bearings, and the weight of the impeller 20, G2, and the stiffness k of the elastomer satisfy the following relationship: G2 / k ≤ 0.9 mm. This proportional relationship between the stiffness of the elastomer and the rotor can reduce fluctuations in the compression of the elastomer caused by vibration excitation during transportation of the motor, thereby preventing failure or damage of the elastomer due to vibration excitation during prolonged transportation. In conjunction with the aforementioned embodiment, the elastomer can include a first elastomer and a second elastomer. The stiffness of either the first elastomer or the second elastomer can satisfy this requirement, or the stiffness of both the first elastomer and the second elastomer can satisfy this requirement.

[0125] The present application also provides a HVAC device, comprising the motor 10 according to any one of the above embodiments.

[0126] The technical effects and explanations of the above-mentioned motor 10 embodiment of this application are also applicable to the HVAC equipment of the embodiment of this application.

[0127] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0128] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0129] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0130] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0131] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0132] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A motor, wherein: include: A rotor assembly, a stator assembly, at least one bearing and at least one elastomer, wherein the bearing is connected to the rotor assembly and their relative position is fixed. An elastomer is provided between the bearing and the stator assembly to maintain the bearing on the stator assembly with a certain axial preload and retain a certain compressible height.

2. The motor according to claim 1, wherein The at least one bearing includes a first bearing and a second bearing, and the at least one elastic body includes a first elastic body and a second elastic body. The first elastic body elastically supports the first bearing, and the second elastic body elastically supports the second bearing.

3. The motor according to claim 2, wherein The supporting direction of the first bearing by the first elastic body is opposite to the supporting direction of the second bearing by the second elastic body; and / or, the first elastic body and the second elastic body have the same or different stiffness; And / or, the first elastic body and the second elastic body are arranged between the first bearing and the second bearing.

4. The motor according to claim 2, wherein The motor has an axial extension side and a non-axial extension side in the axial direction, the rotor shaft of the rotor assembly extends from the axial extension side, the first elastomer is closer to the axial extension side than the second elastomer, and the stiffness of the first elastomer is greater than or equal to the stiffness of the second elastomer.

5. The motor according to claim 2, wherein The stator assembly includes a bearing seat that can accommodate the first bearing and the second bearing. A positioning protrusion is provided in the bearing seat. The first elastomer is stopped between the first bearing and the positioning protrusion, and the second elastomer is stopped between the second bearing and the positioning protrusion.

6. The motor according to claim 2, wherein The minimum axial gap between the rotor assembly and the stator assembly is less than or equal to the compressible height of the first elastomer; and / or the minimum axial gap between the rotor assembly and the stator assembly is less than or equal to the compressible height of the second elastomer.

7. The motor according to any one of claims 2 to 6, wherein: The compressible height of the first elastic body and the compressible height of the second elastic body are the same or different.

8. The motor according to any one of claims 1 to 7, wherein: The elastic body is a wave pad.

9. The motor according to any one of claims 1 to 8, wherein: The compressible height of the elastic body is not less than 0.5 mm and not more than 3 mm; and / or the pre-tightening force of the elastic body at the compressible height is not less than 10 N and not more than 150 N.

10. The motor according to any one of claims 1 to 9, wherein: The total gravity G1 of the rotor assembly and the bearing and the stiffness k of the elastic body satisfy the following: G1 / k≤0.25mm.

11. The motor according to claim 1, wherein The motor is an outer rotor motor.

12. The motor according to any one of claims 1 to 6 and 11, wherein: The minimum axial gap between the rotor assembly and the stator assembly is less than or equal to the compressible height, so that the rotor assembly contacts the stator assembly under the action of an axial external force.

13. The electric machine according to claim 12, wherein The rotor assembly includes an end cover portion, which is axially opposite to the first portion of the stator assembly. A minimum axial gap between the end cover portion and the first portion is less than or equal to the compressible height.

14. The electric machine according to claim 13, wherein The first portion includes a bearing seat capable of accommodating the at least one bearing, the bearing seat being axially opposite to the end cover portion, and a minimum axial gap thereof being less than or equal to the compressible height; Alternatively, the first portion includes a first stator overmolded portion that wraps the stator core, the first stator overmolded portion is axially opposite to the end cover portion, and a minimum axial gap is less than or equal to the compressible height; Alternatively, the end cover portion includes a cover plate, the cover plate is axially opposite to the first portion, and a minimum axial gap is less than or equal to the compressible height; Alternatively, the end cover portion includes a first rotor overmolding portion, the first rotor overmolding portion is axially opposite to the first portion, and a minimum axial gap is less than or equal to the compressible height.

15. The electric machine according to claim 14, wherein The end cover portion has a first boss, the first boss is axially opposite to the first portion, and an axial gap is less than or equal to the compressible height; Alternatively, the first portion has a second boss, the second boss is axially opposite to the end cover portion, and an axial gap therebetween is less than or equal to the compressible height.

16. The electric machine according to claim 15, wherein The boss is configured in a ring shape around the motor axis; or the boss is configured in a plurality of bosses spaced apart around the motor axis.

17. The electric machine according to claim 12, wherein The rotor assembly includes a sleeve portion, the first portion of the stator assembly is disposed in the sleeve portion, the second portion of the stator assembly is axially opposite to the sleeve portion, and a minimum axial gap is less than or equal to the compressible height.

18. The electric machine according to claim 17, wherein The sleeve portion includes a second rotor plastic-coated portion that wraps the rotor core, the second rotor plastic-coated portion is axially opposite to the second portion of the stator assembly, and a minimum axial gap is less than or equal to the compressible height; Alternatively, the second part includes a second stator overmolded portion connected to the first stator overmolded portion of the first part and extending out of the sleeve portion, the second stator overmolded portion is axially opposite to the sleeve, and the minimum axial gap is less than or equal to the compressible height.

19. The electric machine according to claim 18, wherein The end of the sleeve portion has a third boss, the third boss is axially opposite to the second portion, and an axial gap is less than or equal to the compressible height; Alternatively, the second portion has a fourth boss, the fourth boss is axially opposite to the sleeve portion, and an axial gap therebetween is less than or equal to the compressible height.

20. The electric machine according to claim 19, wherein The boss is configured in a ring shape around the motor axis; or the boss is configured in a plurality of bosses spaced apart around the motor axis.

21. A fan assembly, wherein: The motor comprises an impeller and the motor according to any one of claims 1 to 20, wherein the rotor assembly is connected to the impeller.

22. The fan assembly according to claim 21, wherein: At least a portion of the rotor assembly is integrally formed with the impeller; Alternatively, the rotor assembly includes a rotor overmolded component, and the rotor overmolded component is integrally formed with the impeller; Alternatively, the total gravity G2 of the rotor assembly, the bearing and the impeller and the stiffness k of the elastic body satisfy: G2 / k≤0.9 mm.

23. A heating and ventilation equipment, wherein: The method comprises the motor according to any one of claims 1 to 20; or the fan assembly according to claim 21 or 22.

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