Motor

Abstract

Embodiments of the present invention provide a motor. The motor comprises a housing, a stator assembly, and a rotor assembly, and an air inlet and an air outlet are formed in the housing; the housing and the stator assembly jointly form an airflow channel, the airflow channel is communicated with the air inlet and the air outlet, and a mounting space is formed in the stator assembly; the rotor assembly rotatably passes through the mounting space; and the mounting space and the airflow channel are isolated from each other to prevent airflow from flowing between the mounting space and the airflow channel. According to the motor provided in the embodiments of the present invention, the airflow channel and the mounting space which are isolated from each other are provided, thereby preventing the airflow from being in contact with the rotor assembly, preventing impurities carried in the external airflow from being adsorbed to the rotor assembly, reducing the impact on rotation of a rotor due to the impurities blocking in the mounting space, reducing the risk of short circuit caused by electric conduction between the rotor assembly and other parts due to impurity adhesion, and blocking certain heat transferred by the stator assembly to the rotor assembly.

Description

A motor

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202310784743.1 and application date of June 29, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The embodiments of the present invention relate to the technical field of motors, and in particular to a motor. Background Art

[0004] Permanent magnet synchronous motors (PMSMs) offer the advantages of high efficiency and power density. However, during operation, high electromagnetic loads and heat generation can cause temperatures in key components such as the stator windings, permanent magnets, and bearings to rise. This can even lead to localized temperature rise and demagnetization of the permanent magnets, directly threatening safe motor operation. Therefore, motor cooling is often necessary. Traction motors are typically cooled using ventilation cooling, which draws external air into the motor to dissipate accumulated heat and cool the motor.

[0005] Since the permanent magnets installed on the rotor of the permanent magnet motor have magnetic effects, during ventilation, the permanent magnets will adsorb ferromagnetic debris in the air dust onto the rotor, which may cause internal blockage and temperature increase at the least, or even cause grounding faults in the motor insulation at the worst.

[0006] Summary of the Invention

[0007] In view of this, an embodiment of the present invention desires to provide a motor capable of preventing dust in the heat dissipation airflow from being adsorbed onto the rotor.

[0008] To achieve the above-mentioned purpose, the technical solution of the embodiment of the present invention is implemented as follows:

[0009] An embodiment of the present invention provides a motor, comprising:

[0010] a housing, wherein the housing is provided with an air inlet and an air outlet;

[0011] a stator assembly, wherein the housing and the stator assembly together form an air flow channel, the air flow channel communicating with the air inlet and the air outlet, and an installation space being provided in the stator assembly;

[0012] a rotor assembly rotatably disposed in the installation space;

[0013] The installation space and the air flow channel are isolated from each other to block air flow between the installation space and the air flow channel.

[0014] In some embodiments, the installation space includes a mounting hole and two isolation channels, the mounting hole connects the two isolation channels, at least a portion of the rotor assembly is disposed in the mounting hole, and the cross-sectional size of the isolation channel gradually increases in a direction away from the mounting hole.

[0015] In some embodiments, the stator assembly includes a stator core and two isolation cylinders, an isolation channel is formed on the inner side of the isolation cylinder, the two isolation cylinders are respectively located at one end of the stator core in the axial direction and extend in the axial direction, and seal the stator core and the shell, the stator core is provided with a through air flow hole and a through mounting hole, the mounting hole connects the two isolation channels to form the mounting space, the two axial ends of the stator core are axially spaced from the shell to form two air flow chambers, the air flow hole connects the two air flow chambers to form the air flow channel, and the air inlet and the air outlet are respectively connected to one of the air flow chambers.

[0016] In some embodiments, the shell includes two end covers, which are respectively covered on one end of the stator assembly in the axial direction. The end surface of the end cover axially facing the stator core is axially spaced from the stator core to form the airflow chamber, and the isolation tube is connected between the end cover and the stator core.

[0017] In some embodiments, the stator core includes a core body and a plurality of slot wedges, the core body extends axially, the air flow holes and the mounting holes are both provided on the core body, the core body is provided with a plurality of tooth slots spaced circumferentially along the rotor assembly, the tooth slots penetrate axially and are connected with the mounting holes radially along the rotor assembly, the slot wedges extend axially and close the connection position between the tooth slots and the mounting holes, and the core body and the slot wedges are both sealed and connected to the isolation tube.

[0018] In some embodiments, the side wall portion of the tooth groove is recessed to form a positioning groove, and the slot wedge includes a wedge body and a fixing protrusion, the wedge body extends axially, and the fixing protrusion protrudes from the wedge body along the circumferential surface of the rotor assembly to be embedded in the positioning groove, and the wedge body is sealed and fitted with the side wall of the tooth groove.

[0019] In some embodiments, the positioning groove axially penetrates the core body, the fixing protrusion extends axially, the axial end face of the fixing protrusion and the axial end face of the wedge body are flush with the axial end face of the core body, and the isolation tube abuts the slot wedge and the core body axially, respectively.

[0020] In some embodiments, the slot wedge includes a wedge body and a limiting protrusion, the wedge body extends axially, the limiting protrusion protrudes axially from the axial surface of the wedge body and axially from the core body, and the radial outer side of the limiting protrusion is in contact with the radial inner side of the isolation tube.

[0021] In some embodiments, the outer surface of the isolation cylinder is provided with reinforcing ribs extending in the axial direction; and / or, the inner surface of the isolation cylinder is provided with reinforcing ribs extending in the axial direction.

[0022] In some embodiments, the isolation cylinder includes a cylinder body and an elastic seal, the cylinder body extends axially, the elastic seal is annular and extends circumferentially along the rotor assembly, one end of the cylinder body is sealed and connected to the stator core, and the other end is connected to the elastic seal, the elastic connector is sealed and connected to the housing and can be elastically expanded and contracted at least axially.

[0023] In some embodiments, the shell includes two end covers, which are respectively located at one end of the stator assembly in the axial direction. The end cover is provided with an annular rib on the side close to the stator core in the axial direction, and the annular rib extends circumferentially. The elastic seal is provided with an open groove on the side away from the cylinder, and the annular rib is embedded in the open groove and sealed with the elastic connector.

[0024] In some embodiments, an annular cavity is provided in the elastic sealing member, the annular cavity extends along the circumference of the rotor assembly, and the annular cavity is located on a side of the opening groove close to the cylinder.

[0025] The motor in the embodiment of the present invention prevents contact between the airflow and the rotor assembly by setting up airflow channels and installation spaces that are isolated from each other, thereby avoiding impurities carried in the external airflow from being adsorbed on the rotor assembly, reducing the risk of impurities blocking the installation space and affecting the rotation of the rotor, and reducing the risk of short circuits caused by electrical conduction between the rotor assembly and other components due to the adhesion of impurities; at the same time, it reduces the impact of impurities deposited in the installation space on the size of the air gap, thereby maintaining the stability of the output performance of the motor and increasing the service life of the motor; furthermore, it can block a certain amount of heat transferred from the stator assembly to the rotor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a partial cross-sectional schematic diagram of a motor according to an embodiment of the present invention;

[0027] FIG2 is a partial enlarged schematic diagram of position A in FIG1 ;

[0028] FIG3 is a partial enlarged schematic diagram of position B in FIG1 ;

[0029] FIG4 is a cross-sectional schematic diagram of a stator assembly according to an embodiment of the present invention;

[0030] FIG5 is a schematic diagram of the stator assembly in FIG4 from another perspective;

[0031] FIG6 is a schematic diagram of a stator assembly according to another embodiment of the present invention;

[0032] FIG7 is a partial schematic diagram of a stator core according to an embodiment of the present invention;

[0033] FIG8 is a partial enlarged schematic diagram of position C in FIG7 ;

[0034] FIG9 is a schematic diagram of a slot wedge according to an embodiment of the present invention;

[0035] FIG10 is a schematic diagram of an end cover according to an embodiment of the present invention;

[0036] FIG11 is a schematic diagram of an end cover according to another embodiment of the present invention;

[0037] FIG12 is a schematic cross-sectional view of an elastic sealing member according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions of the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the described embodiments are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0039] In the description of the embodiments of the present invention, the "axial" orientation or position relationship is based on the orientation or position relationship shown in Figures 1 and 4, and the "circumferential" orientation or position relationship is based on the orientation or position relationship shown in Figure 5. It should be understood that these orientation terms are only for the convenience of describing the embodiments of the present invention 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 operate in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present invention.

[0040] An embodiment of the present invention provides a motor. Referring to FIG. 1 , the motor includes a housing 10 , a stator assembly 20 , and a rotor assembly 30 .

[0041] An installation space 20 b is defined in the stator assembly 20 , and the rotor assembly 30 is rotatably disposed in the installation space 20 b .

[0042] Taking a permanent magnet motor as an example, the stator assembly 20 is provided with a stator winding 23, and the rotor assembly 30 is provided with a permanent magnet. When the stator winding 23 is energized, a magnetic field is generated by electromagnetic induction. The generated magnetic field interacts with the magnetic field generated by the permanent magnet to drive the rotor assembly 30 to rotate.

[0043] It can be understood that the inner wall of the installation space 20b is spaced apart from the rotor assembly 30 to form an air gap. On the one hand, it avoids friction between the rotor assembly 30 and the inner wall of the installation space 20b during rotation, thereby reducing the power consumption of driving the rotor to rotate; on the other hand, the air gap affects the magnetic resistance and excitation current during the operation of the motor, thereby affecting the working performance of the motor.

[0044] It is understandable that during the operation of the motor, due to mechanical friction, eddy current loss, etc., the stator assembly 20 and the rotor assembly 30 will generate heat, thereby affecting their normal operation.

[0045] The heat generated by the stator assembly 20 during operation is transferred to the housing 10 through heat radiation and heat conduction.

[0046] The housing 10 is provided with an air inlet 10a and an air outlet 10b. The housing 10 and the stator assembly 20 together form an air flow channel 20a, which connects the air inlet 10a and the air outlet 10b.

[0047] The air flow enters the air flow channel 20a from the air inlet 10a, and absorbs a portion of the heat on the stator assembly 20 and the housing 10 by contacting the housing 10 and the stator assembly 20. The air flow then discharges the motor from the air outlet 10b, thereby taking away the heat and reducing the temperature of the housing 10 and the stator assembly 20.

[0048] The installation space 20b and the airflow channel 20a are isolated from each other to block the airflow from flowing between the installation space 20b and the airflow channel 20a. In other words, the airflow cannot enter the installation space 20b from the airflow channel 20a.

[0049] The motor in the embodiment of the present invention prevents contact between the airflow and the rotor assembly 30 by setting an airflow channel 20a and an installation space 20b that are isolated from each other, thereby avoiding impurities carried in the external airflow from being adsorbed on the rotor assembly 30, reducing the risk of impurities blocking the installation space 20b and affecting the rotation of the rotor, and reducing the risk of short circuit caused by electrical conduction between the rotor assembly 30 and other components due to the adhesion of impurities; at the same time, it reduces the impact of impurities deposited in the installation space 20b on the air gap size, thereby maintaining the stability of the motor's output performance and increasing the service life of the motor; furthermore, it can block a certain amount of heat transferred from the stator assembly 20 to the rotor assembly 30.

[0050] It can be understood that the heat generated by the rotor assembly 30 during operation is transferred to the gas in the installation space 20b by heat conduction, and the gas then transfers the heat to the inner wall of the installation space 20b; and the heat generated by the rotor assembly 30 during operation is directly transferred to the inner wall of the installation space 20b by heat radiation, so that the heat generated by the rotor assembly 30 can be partially transferred to the stator assembly 20, and then the heat is carried out of the motor through the airflow in the airflow channel 20a, thereby indirectly reducing the temperature of the rotor assembly 30.

[0051] It is understandable that the number of the air inlet 10a and the air outlet 10b can be one; or they can be multiple, so as to increase the flow rate of the air flow entering the air flow channel 20a. At the same time, multiple air inlets 10a and air outlets 10b are arranged at different positions on the shell 10 to improve the heat dissipation efficiency.

[0052] It can be understood that the installation space 20b is located radially inward of the air flow channel 20a.

[0053] It can be understood that the shape of the installation space 20 b should be adapted to the rotation and installation of the rotor assembly 30 .

[0054] For example, referring to FIG. 1 , the installation space 20 b extends in the axial direction, so that the layout of the installation space 20 b is adapted to the rotation of the rotor assembly 30 .

[0055] It should be noted that the axial direction is the extending direction of the rotation axis of the rotor assembly 30 .

[0056] For example, referring to Figures 1 and 4, the installation space 20b includes a mounting hole 21a and two isolation channels 22a. The mounting hole 21a connects the two isolation channels 22a. At least a portion of the rotor assembly 30 is disposed in the mounting hole 21a. The cross-sectional dimensions of the isolation channels 22a gradually increase in a direction away from the mounting hole 21a, so as to reduce the probability of collision between the inner wall of the isolation channel 22a and the rotor assembly 30 during the axial installation of the rotor assembly 30 into the installation space 20b. At the same time, the installation process has a larger operating space, which facilitates the installation of the rotor assembly 30 and improves the installation efficiency.

[0057] In some embodiments, referring to FIG. 1 , the air inlet 10 a is located at one axial end of the motor, and the air outlet 10 b is located at the other end, so that air can pass through the motor axially, thereby improving heat dissipation efficiency.

[0058] It can be understood that one end of the installation space 20b is open in the axial direction, so that part of the rotor assembly 30 can extend out of the installation space 20b and be driven and connected to other external equipment, or other external equipment can extend into the installation space 20b through the opening and be driven and connected to the rotor assembly 30.

[0059] The specific structure of the stator assembly 20 is not limited.

[0060] Exemplarily, referring to the drawings, the stator assembly 20 includes a stator core 21 and two isolation cylinders 22 .

[0061] An isolation channel 22a is formed on the inner side of the isolation tube 22. The two isolation tubes 22 are respectively located at one end of the stator core 21 in the axial direction and extend in the axial direction, and seal the stator core 21 and the shell 10. The stator core 21 is provided with a through air flow hole and a through mounting hole 21a. The mounting hole 21a connects the two isolation channels 22a to form an installation space 20b. The two axial ends of the stator core 21 are axially spaced from the shell 10 to form two air flow chambers 20c. That is to say, the radial inner side of the isolation tube 22 along the rotor assembly 30 is part of the mounting space 20b, and the outer side is part of the air flow chamber 20c. The air flow hole connects the two air flow chambers 20c to form an air flow channel 20a, and the air inlet 10a and the air outlet 10b are respectively connected to one air flow chamber 20c.

[0062] The air flow flows into an air flow chamber 20c through the air inlet 10a, then flows into the air flow hole, and then the air flow hole flows into another air flow chamber 20c, and finally flows out from the air outlet 10b to form an air flow path of the air inlet 10a→an air flow chamber 20c→air flow hole→another air flow chamber 20c.

[0063] On the one hand, the air flow in the air flow chamber 20c contacts one axial end of the stator core 21 to absorb and take away the heat of the stator core 21; on the other hand, it contacts the isolation cylinder 22 to directly absorb the heat of the isolation cylinder 22. Part of the heat in the isolation cylinder 22 comes from the heat of the gas transferred from the rotor assembly 30 to the installation space 20b. Therefore, the air flow in the air flow chamber 20c indirectly takes away the heat generated by the rotor assembly 30.

[0064] The air flow directly passes through the stator core 21 through the air flow holes, thereby directly absorbing and taking away the heat of the stator core 21 .

[0065] It is understandable that the airflow chamber 20c is annular so that the airflow can contact the isolation tube 22 and the stator core 21 along the circumferential direction, thereby expanding the contact area between the airflow and the isolation tube 22 and the stator core 21 and improving the heat dissipation effect.

[0066] The number of the air flow holes is not limited and can be one or more. Referring to FIG. 5 to FIG. 7 , the multiple air flow holes are arranged at intervals along the circumferential direction.

[0067] In some embodiments, referring to FIG. 1 and FIG. 2 , the cross-sectional dimensions of the inner wall and the outer wall of the isolation tube 22 gradually increase in a direction away from the mounting hole 21 a , so that the thickness of the isolation tube 22 is uniform and the structure is more compact.

[0068] It is understandable that the inner wall of the mounting hole 21 a is sprayed with heat-insulating paint to reduce heat radiation from the stator assembly 20 to the rotor assembly 30 .

[0069] The thickness of the coating of the thermal insulation paint is less than one third of the gap size between the inner wall of the mounting hole 21 a and the rotor assembly 30 .

[0070] The specific structure of the housing 10 is not limited.

[0071] For example, referring to FIG1 , the housing 10 includes two end covers 11, and the two end covers 11 are respectively provided on one end of the stator assembly 20 in the axial direction. The end surface of the end cover 11 facing the stator core 21 in the axial direction is spaced apart from the stator core 21 in the axial direction to form an airflow chamber 20c, and the isolation tube 22 is connected between the end cover 11 and the stator core 21. In other words, the end cover 11, the stator core 21 and the isolation tube 22 are together arranged to form the airflow chamber 20c. The radial outer surface of the stator assembly 20 is at least partially exposed to the outside world. On the one hand, the heat on the stator assembly 20 can be directly carried away by the outside air, thereby improving the heat dissipation efficiency; on the other hand, the number of components in the motor is reduced, the compactness of the motor structure is improved, and it is conducive to achieving the lightweight of the motor.

[0072] It can be understood that at least one end cover 11 is provided with a through hole running through in the axial direction.

[0073] The specific positions of the air inlet 10a and the air outlet 10b on the end cover 11 are not limited. For example, they may penetrate the end cover 11 in the radial direction or in the axial direction.

[0074] The specific connection method between the end cover 11 and the stator core 21 is not limited. For example, the joint between the end cover 11 and the stator core 21 is fully welded along the circumference to achieve a fixed connection between the two. At the same time, the sealing between the two is ensured, the airflow in the airflow chamber 20c is reduced from overflowing from the joint between the end cover 11 and the stator core 21, and the heat dissipation effect is improved. In another example, the end cover 11 and the stator core 21 are connected by bolts, and the pre-tightening force of the bolts ensures a tight seal between the end cover 11 and the stator core 21.

[0075] The stator assembly 20 further includes a stator winding 23 , which is capable of conducting current to generate a magnetic field through electromagnetic induction.

[0076] The specific structure of the stator core 21 is not limited.

[0077] For example, referring to FIG. 4 to FIG. 7 , the stator core 21 includes a core body 211 and a plurality of slot wedges 212 .

[0078] The core body 211 extends in the axial direction, and the air flow holes and the mounting holes 21a are both provided on the core body 211. The core body 211 is made of several layers of silicon steel sheets that are laminated and processed.

[0079] The core body 211 is provided with a plurality of slots 211a spaced apart along the circumference of the rotor assembly 30. The slots 211a extend axially through the core body 211a, allowing the stator winding 23 to reciprocate between the slots 211a. The slots 211a communicate with the mounting holes 21a in the radial direction of the rotor assembly 30, allowing the stator winding 23 to be installed into the slots 211a at the connection points between the slots 211a and the mounting holes 21a.

[0080] It can be understood that both ends of the tooth slot 211a along the axial direction are connected to the air flow channel 20a, and the air flow in the air flow channel 20a can enter the tooth slot 211a, thereby taking away the heat energy converted from part of the electrical energy of the stator winding 23 during the power-on process, thereby reducing the temperature of the stator winding 23 and improving the heat dissipation efficiency.

[0081] It can be understood that the stator winding 23 is generally composed of conductive metal wires, so the stator winding 23 has a certain degree of elasticity.

[0082] The slot wedges 212 extend axially and seal the connection between the slots 211a and the mounting holes 21a. On the one hand, the slot wedges 212 constrain the stator windings 23 in the slots 211a, helping to keep the stator windings 23 in place and reducing the chance of the stator windings 23 falling out of the slots 211a, thereby maintaining stable motor operation. On the other hand, the slots 211a are prevented from communicating with the mounting holes 21a, providing an isolation barrier and preventing airflow from entering the mounting holes 21a through the slots 211a and potentially introducing impurities.

[0083] It can be understood that the slot wedge 212 is made of insulating material.

[0084] The core body 211 and the slot wedge 212 are both sealedly connected to the isolation tube 22 to prevent airflow from entering the installation space 20b from the joint between the three.

[0085] 1 , 2 and 6 , both ends of the stator winding 23 protrude from the slots 211 a and partially extend into the airflow chamber 20 c.

[0086] It can be understood that the isolation cylinder 22 can play a role in constraining the position of the stator winding 23 .

[0087] The specific manner in which the isolation tube 22 achieves a sealed connection is not limited.

[0088] For example, referring to Figure 2, the isolation tube 22, the slot wedge 212 and the core body 211 are bonded together by an insulating adhesive coating 40, and the insulating adhesive coating 40 is covered on the joint position of the isolation tube 22, the slot wedge 212 and the core body 211, so that the isolation tube 22, the slot wedge 212 and the core body 211 are connected together, and the insulation performance is improved, preventing airflow from entering the installation space 20b from the joint position of the isolation tube 22, the slot wedge 212 and the core body 211, thereby playing an isolation role.

[0089] 2 , the insulating adhesive coating 40 bonds the isolation sleeve 22 and the stator winding 23 , so that the isolation sleeve and the stator winding 23 constrain each other and improve installation stability.

[0090] The specific material of the insulating adhesive coating 40 is not limited, such as silicone, which has good thermal conductivity and improves heat dissipation efficiency.

[0091] The specific method of fixing the slot wedge 212 in the tooth groove 211a is not limited.

[0092] For example, the slot wedge 212 is bonded to the inner wall of the tooth groove 211 a by an adhesive material to achieve the functions of fixing and sealing.

[0093] For another example, referring to Figures 8 and 9, the side wall portion of the tooth groove 211a is recessed to form a positioning groove 211b, and the slot wedge 212 includes a wedge body 2121 and a fixing protrusion 2122. The wedge body 2121 extends axially, and the fixing protrusion 2122 protrudes from the circumferential surface of the wedge body 2121 along the rotor assembly 30 to be embedded in the positioning groove 211b. The positioning groove 211b is used to constrain the position of the slot wedge 212 in the positioning groove 211b, thereby fixing the slot wedge 212 and reducing the probability of the slot wedge 212 falling off under the action of the airflow pressure in the tooth groove 211a.

[0094] The wedge body 2121 is sealed against the side wall of the tooth groove 211 a to prevent airflow from entering the installation space 20 b from the joint between the wedge body 2121 and the side wall of the tooth groove 211 a .

[0095] The wedge body 2121 and the side wall of the tooth groove 211a are in interference fit or transition fit.

[0096] 8 , the end of the wedge body 2121 radially close to the rotor assembly 30 does not exceed the communication position between the tooth groove 211 a and the mounting hole 21 a .

[0097] 8 , the cross-sectional shapes of the positioning groove 211 b and the fixing protrusion 2122 along the radial direction of the rotor assembly 30 are both arc-shaped to avoid stress concentration.

[0098] It is understandable that both side walls of the tooth groove 211 a may be provided with positioning grooves 211 b to improve the installation stability of the slot wedge 212 .

[0099] In some embodiments, referring to Figures 7 and 8, the positioning groove 211b axially penetrates the core body 211, and the fixing protrusion 2122 extends axially so that the slot wedge 212 can be inserted into the tooth groove 211a axially from both ends of the core body 211 along the axial direction to realize the disassembly and assembly of the slot wedge 212, thereby facilitating the replacement and cleaning of the slot wedge 212.

[0100] In some embodiments, the axial end faces of the fixing protrusions 2122 and the axial end faces of the wedge body 2121 are flush with the axial end faces of the core body 211, and the spacer tube 22 axially abuts the slot wedge 212 and the core body 211. On the one hand, using the axial end face of the core body 211 as the installation reference surface for the slot wedge 212 facilitates determining the installation position of the slot wedge 212 in the tooth slot 211a. On the other hand, the spacer tube 22 abuts the slot wedge 212 and the core body 211, which facilitates fixing the position of the spacer tube 22. Furthermore, the abutment and fit improves the sealing performance and reduces the probability of airflow in the tooth slot 211a and the airflow channel 20a entering the installation space 20b through the joints between the spacer tube 22, the slot wedge 212, and the core body 211.

[0101] In some embodiments, referring to Figures 2, 4 and 9, the slot wedge 212 includes a wedge body 2121 and a limiting protrusion 2123. The wedge body 2121 extends axially, and the limiting protrusion 2123 protrudes axially from the axial surface of the wedge body 2121 and protrudes axially from the core body 211. The radial outer side of the limiting protrusion 2123 is in contact with the radial inner side of the isolation cylinder 22, so that the slot wedge 212 and the isolation cylinder 22 are radially constrained to each other, avoiding the isolation cylinder 22 from extending into the mounting hole 21a during installation and use, facilitating the installation of the isolation cylinder 22 to a preset position, and avoiding communication between the airflow channel 20a and the installation space 20b.

[0102] It can be understood that the insulating adhesive coating 40 radially bonds the limiting protrusion 2123 and the isolation cylinder 22 so that the radial positions of the isolation cylinder 22 and the slot wedge 212 are fixed.

[0103] 4 , both ends of the wedge body 2121 along the axial direction are provided with limiting protrusions 2123 so as to constrain the slot wedge 212 and the two isolation cylinders 22 .

[0104] The size of the limiting protrusion 2123 protruding axially from the surface of the core body 211 along the axial direction ranges from 5 mm (millimeter) to 15 mm, and the specific value is not limited, for example, 5 mm, 10 mm, 15 mm, etc.

[0105] 9 , the limiting protrusion 2123 is flush with the radial inner surface of the wedge body 2121 and is offset from the radial outer surface by a distance of 1.5 mm to 5 mm. The specific value may be any value, such as 1.5 mm, 2 mm, 3 mm, 4 mm, and 5 mm.

[0106] The isolation tube 22 is made of a material with good thermal insulation performance, such as nylon, to reduce the heat transferred between the stator assembly 20 and the rotor assembly 30 .

[0107] It is understandable that the isolation cylinder 22 is a thin-walled structure to reduce the space occupied by the motor interior and improve the adaptability of the isolation cylinder 22 .

[0108] It is understandable that, since the thickness of the isolation cylinder 22 is relatively thin, the structural strength of the isolation cylinder 22 needs to be strengthened.

[0109] For example, referring to Figure 6, the outer surface of the isolation tube 22 is provided with a reinforcing rib 221 extending in the axial direction. The reinforcing rib 221 increases the magnitude of the radial force that the isolation tube 22 can withstand, thereby improving the overall structural strength of the isolation tube 22 and reducing the probability of damage to the isolation tube 22 due to vibration and other reasons during the operation of the motor.

[0110] It is understandable that the outer edge size of the reinforcing rib 221 located on the outer surface of the isolation tube 22 in the radial direction is smaller than the inner contour size of the stator winding 23 , so that the reinforcing rib 221 and the stator winding 23 are spaced apart from each other.

[0111] The difference between the radial outer edge dimension of the reinforcing rib 221 located on the outer surface of the isolation tube 22 and the inner contour dimension of the stator winding 23 is greater than 2 mm, and the specific value is not limited, for example, 3 mm, 4 mm, 5 mm, etc.

[0112] For example, referring to Figures 4 and 6, the inner surface of the isolation tube 22 is provided with axially extending reinforcing ribs 221. The reinforcing ribs 221 increase the radial force that the isolation tube 22 can withstand, thereby improving the overall structural strength of the isolation tube 22 and reducing the probability of damage to the isolation tube 22 due to vibration and other reasons during the operation of the motor.

[0113] The radial inner edge size of the reinforcing rib 221 located on the inner surface of the isolation cylinder 22 is larger than the outer contour size of the rotor assembly 30 to facilitate installation of the rotor assembly 30 .

[0114] The difference between the radial inner edge dimension of the reinforcing rib 221 located on the inner surface of the isolation cylinder 22 and the outer contour dimension of the rotor assembly 30 is greater than 2 mm, and the specific value is not limited, for example, 3 mm, 4 mm, 5 mm, etc.

[0115] There are multiple reinforcing ribs 221 , which are arranged at intervals along the circumference of the rotor assembly 30 to improve the structural strength of the isolation cylinder 22 along various radial directions.

[0116] The specific method for achieving the sealed connection between the isolation cylinder 22 and the housing 10 is not limited.

[0117] For example, referring to Figures 3 and 4, the isolation cylinder 22 includes a cylinder body 222 and an elastic seal 223. The cylinder body 222 extends axially, and the elastic seal 223 is annular and extends circumferentially along the rotor assembly 30. One end of the cylinder body 222 is sealed and connected to the stator core 21, and the other end is connected to the elastic seal 223. The elastic connector is sealed and connected to the shell 10. That is to say, the elastic seal 223 completely seals the connection position between the isolation cylinder 22 and the shell 10 along the circumferential direction, thereby reducing the probability of airflow entering the installation space 20b from the airflow channel 20a.

[0118] The elastic connector is elastically expandable and contractible at least in the axial direction. During the installation of the housing 10 and the stator assembly 20, the elastic connector is compressed in the axial direction. This, on the one hand, helps the spacer cylinder 22 accommodate different axial dimensional tolerances between the housing 10 and the stator assembly 20. On the other hand, the elastic connector expands and contracts in the axial direction, maintaining axial contact between the elastic connector and the cylinder 222 and the housing 10, respectively, which helps improve sealing performance.

[0119] The elastic connector is made entirely of elastic material, and the specific material is not limited, such as temperature-resistant rubber.

[0120] The specific method for achieving connection between the housing 10 and the elastic connector is not limited.

[0121] For example, in an embodiment in which the shell 10 is composed of two end covers 11, referring to Figures 3, 10, 11 and 12, the end cover 11 is provided with an annular rib on the side axially close to the stator core 21, the annular rib 111 extends circumferentially, and the elastic seal 223 is provided with an open groove 223a on the side facing away from the cylinder 222. The annular rib 111 is embedded in the open groove 223a and is sealed with the elastic connector. The radial installation position of the elastic seal 223 is limited by the fit between the side wall of the open groove 223a and the annular rib 111.

[0122] It can be understood that the side wall of the opening groove 223 a and the annular rib 111 are in a transition fit or an interference fit.

[0123] In some embodiments, referring to Figures 3 and 12 , an annular cavity 223b is defined in the elastic seal 223. The annular cavity 223b extends circumferentially around the rotor assembly 30 and is located on the side of the opening 223a adjacent to the cylinder 222. The annular cavity 223b weakens the structural strength of the elastic seal 223, thereby increasing the axial deformation of the elastic seal 223 and improving the sealing effect.

[0124] The various embodiments / implementations provided by the present invention can be combined with each other without causing any contradiction.

[0125] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible in the embodiments of the present invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the embodiments of the present invention shall be included within the scope of protection of the embodiments of the present invention.

Claims

1. A motor, comprising: A shell, wherein the shell is provided with an air inlet and an air outlet; A stator assembly, wherein the housing and the stator assembly together form an air flow channel, the air flow channel communicates with the air inlet and the air outlet, and an installation space is provided in the stator assembly; A rotor assembly, the rotor assembly being rotatably disposed in the installation space; The installation space and the air flow channel are isolated from each other to block air flow between the installation space and the air flow channel.

2. According to the motor according to claim 1, the installation space includes a mounting hole and two isolation channels, the mounting hole connects the two isolation channels, at least part of the rotor assembly is arranged in the mounting hole, and the cross-sectional size of the isolation channel gradually increases in the direction away from the mounting hole.

3. The motor according to claim 1, wherein the stator assembly comprises a stator core and two isolation cylinders, an isolation channel is formed on the inner side of the isolation cylinder, the two isolation cylinders are respectively located at one end of the stator core in the axial direction and extend in the axial direction, and seal the stator core and the shell, the stator core is provided with a through air flow hole and a through mounting hole, the mounting hole connects the two isolation channels to form the mounting space, the two ends of the stator core in the axial direction are axially spaced from the shell to form two air flow chambers, the air flow hole connects the two air flow chambers to form the air flow channel, and the air inlet and the air outlet are respectively connected to one of the air flow chambers.

4. The motor according to claim 3, the shell includes two end covers, the two end covers are respectively covered on one end of the stator assembly along the axial direction, the end surface of the end cover axially facing the stator core is axially spaced from the stator core to form the airflow chamber, and the isolation tube is connected between the end cover and the stator core.

5. The motor according to claim 3, wherein the stator core comprises a core body and a plurality of slot wedges, the core body extending axially, the air flow holes and the mounting holes both being arranged on the core body, the core body being provided with a plurality of tooth slots spaced circumferentially along the rotor assembly, the tooth slots penetrating axially and connected with the mounting holes radially along the rotor assembly, the slot wedges extending axially and closing the connecting position between the tooth slots and the mounting holes, the core body and the slot wedges being sealed and connected with the isolation tube.

6. The motor according to claim 5, the side wall portion of the tooth slot is recessed to form a positioning groove, the slot wedge comprises a wedge body and a fixing protrusion, the wedge body extends axially, the fixing protrusion protrudes from the circumferential surface of the wedge body along the rotor assembly to be embedded in the positioning groove, and the wedge body is sealingly fitted with the side wall of the tooth slot.

7. The motor according to claim 6, the positioning groove axially penetrates the core body, the fixing protrusion extends axially, the axial end surface of the fixing protrusion and the axial end surface of the wedge body are flush with the axial end surface of the core body, and the isolation cylinder is axially abutted against the slot wedge and the core body respectively.

8. According to the motor according to claim 5, the slot wedge includes a wedge body and a limiting protrusion, the wedge body extends axially, the limiting protrusion protrudes axially from the axial surface of the wedge body and axially from the core body, and the radial outer side of the limiting protrusion is in contact with the radial inner side of the isolation tube.

9. The motor according to claim 3, wherein the outer surface of the isolating tube is provided with reinforcing ribs extending in the axial direction; and\or, the inner surface of the isolating tube is provided with reinforcing ribs extending in the axial direction.

10. According to the motor according to claim 3, the isolation cylinder includes a cylinder body and an elastic seal, the cylinder body extends axially, the elastic seal is annular and extends circumferentially along the rotor assembly, one end of the cylinder body is sealed and connected to the stator core, and the other end is connected to the elastic seal, the elastic connecting member is sealed and connected to the casing and can be elastically retracted at least axially.

11. The motor according to claim 10, wherein the shell comprises two end covers, the two end covers are respectively located at one end of the stator assembly along the axial direction, the end cover is provided with an annular convex rib on the side close to the stator core along the axial direction, the annular rib extends circumferentially, the elastic sealing member is provided with an open groove on the side away from the cylinder, the annular rib is embedded in the open groove and is sealed with the elastic connecting member. 12 . The motor according to claim 11 , wherein the elastic seal is provided with an annular cavity, the annular cavity extends along the circumference of the rotor assembly, and the annular cavity is located on a side of the opening groove close to the cylinder.

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