WO2024109305A1

WO2024109305A1 - Motor

Info

Publication number: WO2024109305A1
Application number: PCT/CN2023/120419
Authority: WO
Inventors: 单凌宇; 郑礼成; 吴迪
Original assignee: 淮安威灵电机制造有限公司
Priority date: 2022-11-21
Filing date: 2023-09-21
Publication date: 2024-05-30
Also published as: CN115765331A

Abstract

The present application relates to the technical field of motors, and provides a motor. The motor comprises: a stator assembly, the stator assembly comprising an accommodating cavity; a rotor assembly, rotatably disposed in the accommodating cavity; a shielding layer, disposed at an inner surface of the accommodating cavity and located between the stator assembly and the rotor assembly, the shielding layer being electrically conductive, and the shielding layer being grounded by means of the stator assembly.

Description

Motor

This application claims priority to the Chinese patent application filed with the China Patent Office on November 21, 2022, with application number 202211453106.8 and application name “Motor”, all contents of which are incorporated by reference into this application.

Technical Field

The present application relates to the technical field of motors, and in particular to a motor.

Background technique

In the related technology, high-efficiency brushless DC motors generally replace induction motors. In the process of driving brushless DC motors through pulse width modulation, the neutral point potential of the winding is not zero and common mode voltage occurs. Under high frequency conditions, coupling capacitance will be generated between the motor structures. The coupling capacitance between the stator, rotor, permanent magnet, end cover and other parts and the bearing capacitance form a loop. The voltage generated by this common mode voltage between the inner and outer rings of the bearing is called shaft voltage. Shaft voltage can cause electrical corrosion of the bearing, shorten the life of the bearing, and affect the safety and reliability of the motor.

Therefore, how to overcome the above-mentioned technical defects has become a technical problem that needs to be solved urgently.

Technical Solutions

The present application aims to solve at least one of the technical problems existing in the prior art.

To this end, one aspect of the present application provides a motor.

In view of this, the present application provides a motor, which includes: a stator assembly, the stator assembly includes a accommodating cavity; a rotor assembly, rotatably disposed in the accommodating cavity; a shielding layer, disposed on the inner surface of the accommodating cavity and located between the stator assembly and the rotor assembly; wherein the shielding layer is conductive and is configured to be grounded.

In addition, the above motor provided in this application may also have the following additional technical features:

In some technical solutions of the present application, optionally, the stator assembly includes: a casing; a stator core, which is arranged in the casing, and the rotor assembly is passed through the stator core, and the inner surface of the casing and the inner annular surface of the stator core jointly enclose a accommodating cavity; and a winding, which is arranged in the stator core.

In some technical solutions of the present application, optionally, the shielding layer is located on the inner surface of the casing.

In some technical solutions of the present application, optionally, the shielding layer is located on the inner surface of the casing and the inner annular surface of the stator core.

In some technical solutions of the present application, optionally, the shielding layer covers the inner annular surface of the stator core.

In some technical solutions of the present application, optionally, the rotor assembly includes: a rotor core, disposed in the accommodating cavity; a rotating shaft, passing through the rotor core and connected to the rotor core; the motor also includes: a supporting part, connected to the casing; a bearing, disposed in the supporting part and sleeved on the rotating shaft.

In some technical solutions of the present application, optionally, a through hole is provided at the first end of the casing, and the rotating shaft passes through the through hole; the supporting part includes: a bracket, which is connected to the casing and is located inside the casing; the bearing includes: a first bearing, which is embedded in the bracket and is located on the first side of the rotor assembly, and the rotating shaft passes through the first bearing.

In some technical solutions of the present application, optionally, the support part also includes: an end cover connected to the second end of the casing; the bearing also includes: a second bearing embedded in the end cover, located on the second side of the rotor core, and the end of the rotating shaft is inserted into the second bearing.

In some technical solutions of the present application, optionally, the end cover is in contact with the stator core, and the motor further includes: a mounting foot connected to the end cover and located on the peripheral side of the end cover, and the mounting foot is configured to be connected to an air conditioner.

In some technical solutions of the present application, optionally, the mounting foot and the end cover are integrally formed.

In some technical solutions of the present application, optionally, the motor further includes: a conductive part, a first end of the conductive part is connected to the stator core, and a second end of the conductive part is configured to be grounded.

In some technical solutions of the present application, optionally, the shielding layer is formed by powder spraying.

In some technical solutions of the present application, optionally, the powder is conductive and non-magnetic.

In some technical solutions of the present application, optionally, the thickness of the shielding layer ranges from greater than 0 mm to less than or equal to 0.35 mm.

Additional aspects and advantages of the present application will become apparent in the following description or will be learned through practice of the present application.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

FIG1 shows one of the structural schematic diagrams of a motor according to an embodiment of the present application;

FIG2 shows a second structural schematic diagram of a motor according to an embodiment of the present application;

FIG3 shows a third structural schematic diagram of a motor according to an embodiment of the present application;

FIG4 shows a fourth structural schematic diagram of a motor according to an embodiment of the present application;

FIG5 shows a fifth structural schematic diagram of a motor according to an embodiment of the present application;

FIG6 shows a sixth structural schematic diagram of a motor according to an embodiment of the present application;

FIG. 7 shows a seventh structural schematic diagram of a motor according to an embodiment of the present application.

The corresponding relationship between the reference numerals and component names in FIGS. 1 to 7 is as follows:

100 motor, 110 stator assembly, 1102 accommodating cavity, 112 housing, 1122 through hole, 114 stator core, 1142 inner annular surface, 116 winding, 120 rotor assembly, 122 rotor core, 124 rotating shaft, 126 magnetic tile, 130 shielding layer, 150 supporting part, 152 bracket, 154 end cover, 160 bearing, 162 first bearing, 164 second bearing, 170 mounting foot, 172 conductive part.

Embodiments of the present invention

In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

The following describes a motor according to some embodiments of the present application with reference to FIGS. 1 to 7 .

As shown in Figures 1 and 4, in one embodiment of the present application, the motor 100 includes: a stator assembly 110, the stator assembly 110 includes a accommodating cavity 1102; a rotor assembly 120, rotatably disposed in the accommodating cavity 1102; a shielding layer 130, disposed on the inner surface of the accommodating cavity 1102 and located between the stator assembly 110 and the rotor assembly 120; wherein the shielding layer 130 is conductive and is configured to be grounded.

The present application defines a motor 100, which includes a stator assembly 110 and a rotor assembly. The stator assembly 110 is used to position and support the rotor assembly. During operation, the rotor assembly rotates under the action of the electromagnetic field generated by the stator assembly 110, thereby converting electrical energy into kinetic energy.

Specifically, the rotor assembly includes a rotor core 122, a magnetic tile 126 and a rotating shaft 124. The inner surface of the stator assembly 110 encloses a receiving cavity 1102 for receiving the rotor assembly 120. The magnetic tile 126 is attached to the outer circumference of the rotor core 122. The rotating shaft 124 is passed through the rotor core 122, and the rotating shaft 124 and the rotor core 122 rotate synchronously. During operation, the rotor assembly 120 rotates relative to the stator assembly 110 in the receiving cavity 1102.

In the related technology, in the process of driving a brushless DC motor through pulse width modulation, the neutral point potential of the winding is not zero and a common mode voltage occurs. Under high frequency conditions, coupling capacitance is generated between the motor structures, and the coupling capacitance between the stator, rotor, permanent magnet, end cover and other parts and the bearing capacitance form a loop. The voltage generated by this common mode voltage between the inner and outer rings of the bearing is called the shaft voltage.

If the shaft voltage reaches the insulation breakdown voltage of the lubricating oil film inside the bearing, it will discharge and generate current, which will cause local melting of the inner surface of the bearing and the ball, that is, electrical corrosion of the bearing. Long-term electrical corrosion will cause wave wear of the bearing, resulting in abnormal noise during bearing operation and a reduction in bearing life.

In this regard, the motor 100 defined in the present application further includes a shielding layer 130, which is disposed on the inner surface of the accommodating cavity 1102, and the shielding layer 130 is between the stator assembly 110 and the rotor assembly 120. On this basis, the shielding layer 130 is conductive, and the shielding layer 130 is grounded through the conductive portion. The shielding layer 130 disposed on the stator assembly 110 can increase the structural capacitance between the stator core 114 and the rotor assembly 120 in the stator assembly 110 on the one hand, and reduce the structural capacitance between the winding 116 on the stator assembly 110 and the rotor assembly 120 on the other hand, thereby reducing the common mode voltage between the stator assembly 110 and the rotor assembly 120 by adjusting the structural equivalent capacitance between the stator assembly 110 and the rotor assembly 120, so as to reduce the shaft voltage ultimately acting on the bearing 160.

It can be seen that the present application adjusts the structural capacitance between the stator assembly 110 and the rotor assembly 120 by setting the shielding layer 130, and reduces the common mode voltage in the motor 100, so as to reduce the probability of the bearing 160 being electro-corroded under the action of excessively high common mode voltage. This solves the technical problems of short bearing life and poor motor safety and reliability existing in the related art. This further achieves the technical effect of optimizing the internal structural capacitance of the motor 100, extending the service life of the bearing 160, and improving the working stability and reliability of the motor 100.

As shown in Figures 2 and 6, in some embodiments of the present application, optionally, the stator assembly 110 includes: a housing 112; a stator core 114, which is disposed in the housing 112, and the rotor assembly 120 is passed through the stator core 114, and the inner surface of the housing 112 and the inner annular surface 1142 of the stator core 114 jointly enclose a accommodating cavity 1102; and a winding 116, which is disposed in the stator core 114.

In this embodiment, the structure of the stator assembly 110 is described. The stator assembly 110 includes a housing 112 and a stator core 114. The housing 112 is wrapped around the outside of the stator core 114 to position and protect the stator core 114. The housing 112 is made of insulating material to provide an insulating outer wall for the stator core 114 and the rotor assembly 120. The stator core 114 is fixedly connected to the housing 112, and the rotor assembly 120 is inserted into the inner annular surface 1142 of the stator core 114. During operation, the rotor assembly 120 rotates relative to the stator core 114 under the action of the electromagnetic field.

On this basis, the inner surface of the housing 112 and the inner annular surface 1142 of the stator core 114 jointly enclose the accommodating cavity 1102, and the shielding layer 130 is arranged on the inner surface of the housing 112, and/or the shielding layer 130 is arranged on the inner annular surface 1142 of the stator core 114. This structure can provide a sufficiently large arrangement surface for the shielding layer 130, thereby providing convenient conditions for effectively adjusting the structural capacitance between the stator assembly 110 and the rotor assembly 120.

Specifically, the total coverage area of the shielding layer 130 on the housing 112 and the stator core 114 is selected according to the adjustment requirements corresponding to the motor 100. For this purpose, this embodiment does not impose a rigid limit on the coverage area of the shielding layer 130, and only needs to meet the requirement that the shaft voltage acting on the bearing 160 under the structure of the motor 100 cannot break through the internal lubricating oil film of the bearing 160.

As shown in FIG. 1 and FIG. 3 , in some embodiments of the present application, optionally, the shielding layer 130 is located on the inner surface of the housing 112 .

In this embodiment, a first arrangement scheme of the shielding layer 130 is proposed. Specifically, the shielding layer 130 is disposed on the inner surface of the housing 112 , and the shielding layer 130 is located on a portion of the surface that participates in enclosing the accommodating cavity 1102 .

The housing 112 is relatively large in size, which is beneficial for reducing the production cost of the motor 100 compared to the solution of molding the shielding layer 130 on the stator core 114 .

As shown in FIG. 1 and FIG. 3 , in some embodiments of the present application, optionally, a portion of the inner surface of the housing 112 that encloses the accommodating cavity 1102 is a first surface (the area indicated by arrow b in FIG. 3 ); the shielding layer 130 covers the first surface.

In this embodiment, the inner surface of the housing 112 that is involved in enclosing the accommodating cavity 1102 is the first surface. Taking the embodiment in which a positioning groove is provided inside the housing 112 and the stator core 114 is embedded in the positioning groove as an example, the inner surface of the positioning groove is blocked by the stator core 114 and does not belong to the first surface. In the axial direction of the stator core 114, the first surface is located on both sides of the stator core 114.

On this basis, the shielding layer 130 covers the first surface to increase the adjustment range of the shielding layer 130 on the internal structural capacitance of the motor 100, ensuring that the common mode voltage generated by the structural capacitance is not sufficient to cause electrical corrosion of the bearing 160. This achieves the technical effect of improving the reliability of the motor 100 and extending the service life of the motor 100.

Specifically, when the shielding layer 130 is distributed only on the first surface, the shielding layer 130 is in contact with the stator core 114 , so as to complete the grounding connection with the help of the stator core 114 .

As shown in FIG. 1 and FIG. 3 , in some embodiments of the present application, optionally, the shielding layer 130 is located on the inner annular surface 1142 of the stator core 114 .

In this embodiment, a second arrangement scheme of the shielding layer 130 is proposed. Specifically, the shielding layer 130 is disposed on the inner surface of the housing 112 , and the shielding layer 130 is located on the inner annular surface 1142 that participates in enclosing the accommodating cavity 1102 .

The stator core 114 is conductive, and the shielding layer 130 can be grounded by grounding the stator core 114 through the conductive part. This reduces the difficulty of grounding the shielding layer 130, and facilitates the grounding connection of the shielding layer 130 without changing the inherent structure of the motor 100, thereby achieving the technical effect of reducing the extent of structural changes and reducing the cost of improving the motor 100.

As shown in FIG. 1 and FIG. 3 , in some embodiments of the present application, optionally, the shielding layer 130 covers the inner annular surface 1142 of the stator core 114 .

In this embodiment, the shielding layer 130 covers the inner annular surface 1142 of the stator core 114. The shielding layer 130 covering the inner annular surface 1142 of the stator core 114 is provided to improve the adjustment effect of the shielding layer 130 on the structural capacitance. On the other hand, the shielding layer 130 covering the entire inner annular surface 1142 of the stator core 114 is uniformly surrounded by the stator core 114, and the adjustment uniformity of each angle of the stator core 114 is good, which is conducive to further improving the adjustment effect of the structural capacitance. Thus, the technical effect of improving the reliability of the motor 100 and reducing the failure rate of the motor 100 is achieved.

Specifically, as shown in FIG2 , the present application also proposes a third arrangement scheme of the shielding layer 130, under which the shielding layer 130 simultaneously covers the first surface in the housing 112 and the inner annular surface 1142 of the stator core 114, and the two parts of the shielding layer 130 located on the housing 112 and the stator core 114 are connected to ensure the grounding property. This arrangement scheme is conducive to expanding the area of the shielding layer 130, thereby improving the regulating effect of the shielding layer 130 on the structural capacitance between the stator assembly 110 and the rotor assembly 120, thereby achieving the technical effect of reducing the electrical corrosion rate of the bearing 160 and extending the service life of the bearing 160.

As shown in Figures 4 and 5, in some embodiments of the present application, optionally, the rotor assembly 120 includes: a rotor core, disposed in the accommodating cavity 1102; and also includes: a rotating shaft 124, which passes through the rotor assembly 120 and is connected to the rotor assembly 120; the motor 100 also includes: a support portion 150, which is connected to the housing 112; a bearing 160, which is disposed in the support portion 150 and is sleeved on the rotating shaft 124.

In this embodiment, the motor 100 further includes a rotating shaft 124. Specifically, the rotating shaft 124 is disposed on the rotor core 122, and the rotating shaft 124, the stator core 114 and the rotor core 122 share an axis to ensure the stability of the operation of the motor 100. The rotating shaft 124 is connected to the rotor core 122 through structures such as keys and keyways to ensure that the rotor core 122 rotating under the electric field can drive the rotating shaft 124 to rotate synchronously.

On this basis, the motor 100 further includes a support portion 150 and a bearing 160. The support portion 150 is connected to the housing 112 and is used to position and install the bearing 160. Specifically, a mounting groove can be provided on the support portion 150, and the bearing 160 is embedded in the mounting groove to facilitate radial and axial positioning of the bearing 160. The rotating shaft 124 is passed through the inner ring of the bearing 160. The bearing 160 is used to provide positioning and support for the rotating shaft 124 to ensure that the rotating shaft 124 can rotate at a high speed and smoothly at a predetermined position, thereby improving the working stability and reliability of the motor 100 and reducing the working noise of the motor 100.

Specifically, the structural capacitance formed by the stator assembly 110 and the rotor assembly 120 will generate a common mode voltage during operation. The common mode voltage will act on the bearing 160 to form an axial voltage between the inner ring and the outer ring of the bearing 160. If the axial voltage is too high, it will break through the lubricating oil film in the bearing 160, causing electrical corrosion problems in the bearing 160. In this regard, the present application adjusts the structural capacitance between the stator assembly 110 and the rotor assembly 120 by setting a shielding layer 130 to reduce the common mode voltage acting on the bearing 160, thereby reducing the possibility of the corresponding axial voltage breaking through the lubricating oil film, thereby achieving the technical effect of reducing the electrical corrosion loss of the bearing 160, extending the service life of the bearing 160, and reducing the working noise of the bearing 160.

As shown in Figures 1 and 4, in some embodiments of the present application, optionally, a through hole 1122 is provided at the first end of the casing 112, and the rotating shaft 124 is passed through the through hole 1122; the support portion 150 includes: a bracket 152, which is connected to the casing 112 and is located in the casing 112; the bearing 160 includes: a first bearing 162, which is embedded in the bracket 152 and is located on the first side of the rotor core 122, and the rotating shaft 124 passes through the first bearing 162.

In this embodiment, a through hole 1122 is provided at the first end of the housing 112, and the first end of the rotating shaft 124 passes through the housing 112 through the through hole 1122 to output power to the transmission mechanism outside the housing 112. On this basis, the support portion 150 includes a bracket 152, and the bearing 160 includes a first bearing 162. The bracket 152 is connected to the first end of the housing 112 and is located inside the housing 112. The bracket 152 and the first bearing 162 are arranged on the first side of the rotor core 122. In the axial direction of the rotating shaft 124, the first bearing 162 is located between the bracket 152 and the rotor core 122 to facilitate axial positioning of the bearing 160.

Specifically, the first bearing 162 is used to support the middle section of the rotating shaft 124 to ensure that the rotating shaft 124 can rotate smoothly and at high speed at a predetermined position.

As shown in Figures 1 and 4, in some embodiments of the present application, optionally, the support portion 150 also includes: an end cover 154, which is connected to the second end of the casing 112; the bearing 160 also includes: a second bearing 164, which is embedded in the end cover 154, located on the second side of the rotor core 122, and the end of the rotating shaft 124 is inserted into the second bearing 164.

In this embodiment, the support portion 150 further includes an end cover 154, and the bearing 160 further includes a second bearing 164. The end cover 154 is connected to the second end of the housing 112. Specifically, the second end of the housing 112 is an open side, and the end cover 154 is in a cover shape. The end cover 154 is buckled on the second end of the housing 112 to enclose a space for accommodating the stator core 114, the rotor core 122, the bracket 152 and the bearing 160.

Specifically, the second bearing 164 is embedded in the end cover 154, and the end cover 154 and the second bearing 164 are located on the second side of the rotor core 122. In the axial direction of the rotating shaft 124, the second bearing 164 is located between the rotor core 122 and the end cover 154, so as to facilitate axial positioning of the second bearing 164. The second end of the rotating shaft 124 is inserted into the inner ring of the second bearing 164 to cooperate with the first bearing 162 to strengthen the axial positioning of the rotating shaft 124, thereby improving the working stability and reliability of the rotating shaft 124.

As shown in FIG. 6 , in some embodiments of the present application, optionally, the end cover 154 contacts the stator core 114 , and the motor 100 further includes: a mounting foot 170 connected to the end cover 154 and located on the peripheral side of the end cover 154 , and the mounting foot 170 is configured for connecting to an air conditioner.

In this embodiment, a first grounding scheme of the shielding layer 130 is proposed. In this scheme, the end cover 154 is conductive, and the stator core 114 is in contact with the end cover 154. On this basis, the motor 100 is further provided with a mounting foot 170, the first end of the mounting foot 170 is connected to the end cover 154, and the second end of the mounting foot 170 is used to connect to the air conditioner, so that the motor 100 is fixed to the air conditioner through the mounting foot 170, and specifically, the second end of the mounting foot 170 can be connected to the housing of the air conditioner to achieve grounding connection.

By setting the mounting foot 170, the shielding layer 130 can be grounded with the help of the stator core 114, the end cover 154 and the mounting foot 170 to ensure that the shielding layer 130 can effectively adjust the structural capacitance between the stator assembly 110 and the rotor assembly 120, and avoid electrical corrosion of the bearing 160 due to excessive shaft voltage.

In some embodiments of the present application, optionally, the mounting foot 170 and the end cover 154 are integrally formed.

In this embodiment, the mounting foot 170 and the end cover 154 are prepared by an integrated molding process. By providing an integrated mounting foot 170 and end cover 154, on the one hand, the reliability of the grounding connection of the shielding layer 130 can be improved by eliminating the structural gap between the mounting foot 170 and the end cover 154. On the other hand, the structural strength of the integrated mounting foot 170 and the end cover 154 is relatively high, and the possibility of bending or even breaking is relatively low, which is beneficial to improving the structural stability of the motor 100. At the same time, preparing the mounting foot 170 and the end cover 154 by an integrated process is beneficial to reducing the process complexity and assembly complexity of the motor 100.

Specifically, the mounting foot 170 and the end cover are integrally formed by using an aluminum casting process.

As shown in FIG. 7 , in some embodiments of the present application, optionally, the motor 100 further includes: a conductive portion 172 , a first end of the conductive portion 172 is connected to the stator core 114 , and a second end of the conductive portion 172 is configured to be grounded.

In this embodiment, a first grounding scheme of the shielding layer 130 is proposed. In this scheme, the motor 100 is further provided with a conductive part 172, a first end of the conductive part 172 is directly connected to the stator core 114, and a second end of the conductive part 172 is grounded, and specifically, the second end of the conductive part 172 can be connected to the housing of the associated product.

Among them, the conductive part 172 can be connected to the inner stator core 114 through the gap enclosed between the casing 112 and the end cover 154, and a through hole 1122 opposite to the outer ring surface of the stator core 114 can be constructed on the casing 112, and the conductive part 172 can be inserted into the through hole 1122 to electrically connect the stator core 114.

By providing the conductive portion 172, the shielding layer 130 can be grounded with the help of the stator core 114 and the conductive portion 172 to ensure that the shielding layer 130 can effectively adjust the structural capacitance between the stator assembly 110 and the rotor assembly 120 to avoid electrical corrosion of the bearing 160 due to excessive shaft voltage.

In some embodiments of the present application, optionally, the shielding layer 130 is formed by powder spraying.

In this embodiment, powder of a material corresponding to the shielding layer 130 is spray-coated on the stator assembly 110 .

The spraying process has the advantages of low molding difficulty and high molding efficiency. Using the spraying process to prepare the shielding layer 130 is beneficial to reducing the process complexity of the motor 100, thereby reducing the production cost of the motor 100.

In some embodiments of the present application, optionally, the powder is electrically conductive and non-magnetic.

In this embodiment, the spray powder used to prepare the shielding layer 130 has the properties of being conductive and non-magnetic. The shielding layer 130 formed by spraying with conductive powder can meet the grounding requirements of the shielding layer 130, ensuring that the shielding layer 130 can effectively adjust the structural capacitance of the motor 100. The shielding layer 130 formed by spraying with non-magnetic powder can prevent the shielding layer 130 from destroying the inherent electromagnetic field inside the motor 100.

In some embodiments of the present application, optionally, the thickness of the shielding layer 130 is in the range of: greater than 0 mm and less than or equal to 0.35 mm.

In this embodiment, the thickness of the shielding layer 130 needs to be greater than 0 mm and less than or equal to 0.35 mm. By limiting the thickness of the shielding layer 130 to be less than or equal to 0.35 mm, the possibility of the rotor assembly 120 scratching the shielding layer 130 can be reduced on the basis of reasonable use of the internal space of the stator assembly 110. On the one hand, it can reduce the possibility of the rotor assembly 120 stalling, and on the other hand, it is conducive to extending the attachment time of the shielding layer 130. In this way, the technical effect of extending the service life of the shielding layer 130 and reducing the failure rate of the motor 100 is achieved.

It should be clarified that in the claims, specification and drawings of the present application, the term "multiple" refers to two or more than two. Unless otherwise clearly defined, the orientation or position relationship indicated by the terms "upper" and "lower" is based on the orientation or position relationship shown in the drawings, which is only for the purpose of more conveniently describing the present application and making the description process easier, rather than indicating or implying that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation, so these descriptions cannot be understood as limitations on the present application; the terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood based on the specific circumstances of the above data.

In the claims, specification and drawings of the present application, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like 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 the claims, specification and drawings of the present application, 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 may be combined in any one or more embodiments or examples in a suitable manner.

The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

A motor, comprising:

A stator assembly, wherein the stator assembly includes a receiving cavity;

A rotor assembly is rotatably disposed in the accommodating chamber;

A shielding layer, provided on the inner surface of the accommodating cavity and located between the stator assembly and the rotor assembly;

The shielding layer is conductive and is configured to be grounded.
The electric machine according to claim 1, wherein the stator assembly comprises:

chassis;

A stator core is disposed in the housing, the rotor assembly is passed through the stator core, and the inner surface of the housing and the inner annular surface of the stator core jointly enclose the accommodating cavity;

The winding is arranged on the stator core.
The motor according to claim 2, wherein:

The shielding layer is located on the inner surface of the housing.
The motor according to claim 3, wherein

The portion of the inner surface of the housing that encloses the accommodating cavity is the first surface;

The shielding layer covers the first surface.
A motor according to any one of claims 2 to 4, wherein

The shielding layer is located on the inner annular surface of the stator core.
The motor according to claim 5, wherein

The shielding layer covers the inner annular surface of the stator core.
A motor according to any one of claims 2 to 6, wherein

The shielding layer is located on the inner surface of the housing and the inner annular surface of the stator core.
The motor according to claim 7, wherein

The portion of the inner surface of the housing that encloses the accommodating cavity is the first surface;

The shielding layer covers the first surface, and the shielding layer covers the inner annular surface of the stator core.
The motor according to any one of claims 2 to 8, wherein the rotor assembly comprises:

A rotor core is disposed in the accommodating cavity;

A rotating shaft, passing through the rotor core and connected to the rotor core;

The motor also includes:

A support portion connected to the housing;

The bearing is arranged on the supporting part and sleeved on the rotating shaft.
The motor according to claim 9, wherein

A through hole is provided at the first end of the housing, and the rotating shaft passes through the through hole;

The support portion comprises:

A bracket, connected to the housing and located inside the housing;

The bearing comprises:

The first bearing is embedded in the bracket and located at a first side of the rotor core, and the rotating shaft passes through the first bearing.
The motor according to claim 9, wherein the support portion further comprises:

an end cover connected to the second end of the housing;

The bearing also includes:

The second bearing is embedded in the end cover and located on the second side of the rotor core. The end of the rotating shaft is inserted into the second bearing.
The motor according to claim 11, wherein the end cover is in contact with the stator core, and the motor further comprises:

The mounting foot is connected to the end cover and is located on the peripheral side of the end cover. The mounting foot is configured to be used for connecting to an air conditioner.
The motor according to claim 12, wherein the mounting foot and the end cover are integrally formed.
The motor according to any one of claims 2 to 13, further comprising:

A conductive part, a first end of which is connected to the stator core, and a second end of which is configured to be grounded.
A motor according to any one of claims 1 to 14, wherein the shielding layer is formed by powder spraying.
The motor according to claim 15, wherein the powder is electrically conductive and non-magnetic.
A motor according to any one of claims 1 to 14, wherein the thickness of the shielding layer is in the range of: greater than 0 mm and less than or equal to 0.35 mm.