A cooling system for an external rotor electric machine

Abstract

The application relates to the field of outer rotor motors, and particularly discloses a cooling system of an outer rotor motor, which comprises a bearing seat, a stator end cover and a stator assembly. A sealing ring is sleeved on the outer wall of the bearing seat, the stator assembly is installed on the outer side of the sealing ring, the stator end cover is fixed to the end of the bearing seat, the outer wall of the bearing seat is formed with a cooling water channel, and the stator end cover is respectively formed with a water inlet hole and a water outlet hole which are communicated with the cooling water channel. The application can effectively reduce the temperature rise of a high-power outer rotor motor and the heat dissipation of the stator in the outer rotor motor, accelerate the flow and dissipate heat in multiple directions, make the temperature of the stator assembly consistent and reduce the temperature of the stator assembly, reduce the copper loss and the stator stray loss during operation, improve the motor efficiency, eliminate the material structure failure caused by the excessively high temperature, reduce the material structure failure, and enable the outer rotor motor to operate efficiently and reliably.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of outer rotor motor, in particular to a cooling system of outer rotor motor. BACKGROUND

[0002] With the development of motor industry, the performance requirements of motor in various industrial fields are higher and higher, and the excellent cooling system is the premise and guarantee for the improvement of motor power density. For high-power outer rotor motor, the stator assembly of outer rotor motor is a large heat source, which is not easy to dissipate heat, the temperature rise is too high, the output power cannot meet the design requirements, and even the reliability of motor is reduced, and even the motor is burned.

[0003] In order to solve the problem of heat dissipation of the stator assembly in the outer rotor motor, in the related art, the heat dissipation effect is achieved by convection and radiation of bearing seat and stator end cover. Due to the limitation of thermal conductivity coefficient of cast aluminum material or metal material, the heat dissipation capacity of the stator assembly is limited, and it is easy to reach thermal stability. At present, the high-power outer rotor motor is solved. SUMMARY

[0004] In order to reduce the temperature rise of the stator assembly in the outer rotor motor and improve the heat dissipation capacity, the present application provides a cooling system of outer rotor motor.

[0005] The cooling system of outer rotor motor provided by the present application adopts the following technical scheme:

[0006] A cooling system of outer rotor motor, comprising a bearing seat, a stator end cover and a stator assembly, a sealing ring is sleeved on the outer wall of the bearing seat, the stator assembly is installed on the outer side of the sealing ring, the stator end cover is fixed to the end part of the bearing seat, the outer wall of the bearing seat is formed with a cooling water channel, and the stator end cover is respectively formed with a water inlet hole and a water outlet hole which are communicated with the cooling water channel.

[0007] Through the above technical scheme, during the operation of the outer rotor motor, the stator assembly generates heat, the heat is transmitted to the bearing seat through the sealing ring, part of the heat is taken away by the cooling water channel, and part of the heat is transmitted to the stator end cover for self heat dissipation; the cooling water channel can effectively reduce the temperature rise of the high-power outer rotor motor, improve the heat dissipation capacity of the stator in the outer rotor motor, improve the efficiency of the motor, reduce the problem of material structure failure due to high temperature, and enable the outer rotor motor to operate efficiently and reliably.

[0008] Preferably, the cooling water channel comprises a plurality of annular water grooves formed on the outer wall of the bearing seat and an axial water groove formed along the axis direction of the bearing seat, and the plurality of annular water grooves are communicated through the axial water groove.

[0009] By adopting the technical scheme, the cooling water flows through the annular water groove from the axial water groove, and quickly flows to the water outlet hole, and the cooling water is accelerated by flow guiding, and is radiated in multiple directions, so that the cooling is more comprehensive, and the copper loss and the stator stray loss can be effectively reduced when the outer rotor motor operates.

[0010] Preferably, the diameter of the annular water groove is greater than 2mm, and the diameter of the axial water groove is greater than 3 times the diameter of the annular water groove.

[0011] By adopting the technical scheme, the cooling water flows through the annular water groove from the axial water groove, and quickly flows to the water outlet hole, and the cooling water is accelerated by flow guiding, and is radiated in multiple directions, so that the cooling is more comprehensive, and the copper loss and the stator stray loss can be effectively reduced when the outer rotor motor operates.

[0012] Preferably, the inner insert is mounted on the inner side of the bearing seat, and the bearing chamber is formed on the inner side of the inner insert.

[0013] By adopting the technical scheme, the bearing installed in cooperation with the shaft in the bearing seat can be installed in the bearing chamber, so that the bearing is prevented from being in direct contact with the bearing seat.

[0014] Preferably, the outer wall of the inner insert is formed with external threads, and the inner insert is screwed with the bearing seat.

[0015] By adopting the technical scheme, the inner insert and the bearing seat are screwed, so that the inner insert is stably installed and is not easily moved axially.

[0016] Preferably, the inner insert is welded with the bearing seat.

[0017] By adopting the technical scheme, the inner insert and the bearing seat are welded together, so that the inner insert is prevented from rotating relative to the bearing seat, and the stability of the connection between the inner insert and the bearing seat is further improved.

[0018] Preferably, the connection between the bearing seat and the stator end cover is sealed by glue pouring.

[0019] By adopting the technical scheme, the glue pouring sealing has high sealing effect between the bearing seat and the stator end cover, and the cooling water path and the water inlet hole and the water outlet hole are not easily leaked.

[0020] Preferably, the outer wall of the stator end cover is provided with a plurality of heat dissipation ribs.

[0021] By adopting the technical scheme, the heat dissipation ribs improve the heat dissipation effect of the stator end cover, and further improve the heat dissipation effect of the stator.

[0022] Preferably, the material of the bearing seat is aluminum profile 6061, the material of the stator end cover is cast aluminum ADC12, and the material of the sealing ring is Q235 ordinary carbon structural steel.

[0023] By adopting the technical scheme, the sealing ring material is made of Q235 ordinary carbon structural steel, has a high heat conductivity, and can accelerate heat dissipation of the stator assembly.

[0024] Preferably, the water inlet hole and the water outlet hole are coaxially arranged, and the opening directions of the water inlet hole and the water outlet hole are opposite.

[0025] To sum up, the present application has at least one of the following beneficial technical effects:

[0026] 1. The temperature rise of the high-power outer rotor motor can be effectively reduced, the heat dissipation capacity of the stator in the outer rotor motor is improved, the motor efficiency is improved, the material structure failure due to excessive temperature is reduced, and the outer rotor motor can be efficiently and reliably operated;

[0027] 2. The cooling water flows through the annular water groove from the axial water groove, and quickly flows to the water outlet hole, and is accelerated by flow guide, multi-directional heat dissipation, copper loss and stator stray loss are reduced during operation;

[0028] 3. The inner insert is installed in the inner side of the bearing seat, and the bearing installed in cooperation with the rotating shaft can be installed in the bearing chamber, so that the bearing is avoided from directly contacting the bearing seat. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application;

[0030] Figure 2 is a schematic diagram of the cross section of the embodiment of the present application;

[0031] Figure 3 is a schematic diagram of the structure of the bearing seat in the present application.

[0032] Explanation of reference signs: 1, bearing seat; 2, stator end cover; 3, inner insert; 4, stator assembly; 5, sealing ring; 6, cooling water path; 61, annular water groove; 62, axial water groove; 7, water inlet hole; 8, water outlet hole; 9, bearing chamber; 10, heat dissipation rib; 11, inner rib. DETAILED DESCRIPTION

[0033] The following will be described in detail in combination with the accompanying Figures 1-3 The present application will be further described in detail.

[0034] The embodiment of the present application discloses a cooling system of an outer rotor motor.

[0035] Reference Figure 1 and Figure 2The application relates to a cooling system of an outer rotor motor, which comprises a bearing seat 1, a stator end cover 2, an inner insert 3 and a stator assembly 4, the bearing seat 1 is a cylindrical structure made of aluminum profile 6061, the stator end cover 2 is a disc-shaped structure made of cast aluminum ADC12 and provided with a mounting flange, one end of the bearing seat 1 is mounted on the stator end cover 2, a sealing ring 5 is sleeved on the outer wall of the bearing seat 1, the stator assembly 4 is mounted on the outer wall of the sealing ring 5, and a cooling water channel 6 is formed on the outer wall of the bearing seat 1; meanwhile, the stator end cover 2 is respectively provided with a water inlet hole 7 and a water outlet hole 8 which are communicated with the cooling water channel 6.

[0036] During the operation of the outer rotor motor, the stator assembly 4 generates heat, the heat is transmitted to the bearing seat 1 through the sealing ring 5, part of the heat is taken away by the cooling water channel 6, and part of the heat is transmitted to the stator end cover 2 and is radiated spontaneously by the stator end cover 2. The combination of the two can effectively reduce the temperature rise of the high-power outer rotor motor, improve the stator heat dissipation capacity in the outer rotor motor, improve the motor efficiency, reduce the material structure failure caused by the excessively high temperature, and enable the outer rotor motor to operate efficiently and reliably.

[0037] Referring to Figure 3 Specifically, the cooling water channel 6 formed on the outer wall of the bearing seat 1 comprises a plurality of annular grooves 61 and an axial groove 62, the annular grooves 61 are formed on the outer wall of the bearing seat 1 along the circumferential direction of the bearing seat 1, the axial groove 62 is formed on the outer wall of the bearing seat 1 along the axial direction of the bearing seat 1, the annular grooves 61 are communicated through the axial groove 62, and the annular grooves 61 are distributed at equal intervals along the axial direction of the bearing seat 1. The annular groove 61 located on the side closest to the stator end cover 2 of the bearing seat 1 is communicated with the water inlet hole 7 and the water outlet hole 8, meanwhile, the water inlet hole 7 and the water outlet hole 8 are coaxially arranged as circular hole structures, and the opening directions of the two are opposite.

[0038] Further, the diameter of the annular groove 61 is greater than 2mm, and the diameter of the axial groove 62 is greater than 3 times the diameter of the annular groove 61, so that the cooling water can quickly flow into the remaining annular grooves 61 after entering the first annular groove 61 from the water inlet hole 7, and has sufficient power to reach the annular groove 61 farthest from the stator end cover 2.

[0039] One end of the sealing ring 5 close to the stator end cover 2 is inserted into the stator end cover 2 and welded with the stator end cover 2, and the material of the sealing ring 5 is Q235 ordinary carbon structural steel which has a high thermal conductivity and can accelerate the heat dissipation of the stator assembly 4. Meanwhile, two circular holes are formed on the sealing ring 5, when the cooling water enters, it first enters the water inlet hole 7, then flows through one of the circular holes, enters the cooling water channel 6, flows through the cooling water channel 6, then flows through the other circular hole, and finally is discharged from the water outlet hole 8.

[0040] The bearing seat 1 is located on the inner side of the sealing ring 5, and the outer wall of the bearing seat 1 is in interference fit with the inner wall of the sealing ring 5, and the side of the bearing seat 1 close to the stator end cover 2 is embedded into the stator end cover 2, so that the annular water groove 61 on the bearing seat 1 is in communication with the water inlet hole 7 and the water outlet hole 8. The embedded part of the stator end cover 2 and the bearing seat 1 is sealed by glue pouring, and the glue pouring sealing makes the bearing seat 1 and the stator end cover 2 have high sealing effect, and the cooling water channel 6 is in communication with the water inlet hole 7 and the water outlet hole 8, so that the water leakage is not easy to occur.

[0041] Two inner embedded parts 3 are welded on the inner side of the bearing seat 1, and the two inner embedded parts 3 are located at the two ends of the bearing seat 1, and the inner side of the inner embedded part 3 forms a bearing chamber 9 for installing the bearing on the rotating shaft, so that the bearing is avoided from directly contacting with the bearing seat 1. Preferably, the inner embedded part 3 is made of Q235 ordinary carbon structural steel.

[0042] The outer wall of the inner embedded part 3 is formed with external threads, and the inner embedded part 3 is in threaded fit with the bearing seat 1. When the inner embedded part 3 is installed, the two inner embedded parts 3 are screwed into the two ends of the inner side of the bearing seat 1, and then the end of the inner embedded part 3 and the end of the bearing seat 1 are welded. The threaded fit between the two can make the inner embedded part 3 be installed more stably, and the axial movement is not easy to occur. The welding of the inner embedded part 3 and the bearing seat 1 can avoid the rotation of the inner embedded part 3 relative to the bearing seat 1.

[0043] Further, the outer wall of the stator end cover 2 is formed with a plurality of heat dissipation ribs 10, the heat dissipation ribs 10 are distributed along the circumferential direction of the stator end cover 2, and the heat dissipation ribs 10 improve the heat dissipation effect of the stator end cover 2. Meanwhile, a plurality of inner ribs 11 are formed on the side wall of each heat dissipation rib 10, which further improves the heat dissipation effect of the heat dissipation rib 10.

[0044] The implementation principle of the cooling system of the outer rotor motor of the embodiment of the application is as follows: during the working process of the outer rotor motor, the stator assembly 4 generates heat, the heat is transmitted to the bearing seat 1 through the sealing ring 5, part of the heat is taken away by the cooling water channel 6, and part of the heat is transmitted to the stator end cover 2, and the stator end cover 2 and the heat dissipation rib 10 are used for self heat dissipation. The combination of the two can effectively reduce the temperature rise of the high-power outer rotor motor and the stator heat dissipation in the outer rotor motor, accelerate the flow and dissipate heat in multiple directions, make the temperature of the stator assembly 4 consistent and reduce, reduce the copper loss and stator stray loss during operation, improve the motor efficiency, eliminate the material structure failure due to high temperature, and enable the outer rotor motor to operate efficiently and reliably.

[0045] The above are the preferred embodiments of the application, and do not limit the protection scope of the application, so: any equivalent changes made according to the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A cooling system for an external rotor motor, characterized in that: The system includes a bearing housing (1), a stator end cover (2), and a stator assembly (4). A sealing ring (5) is fitted on the outer wall of the bearing housing (1). The stator assembly (4) is installed on the outside of the sealing ring (5). The stator end cover (2) is fixed to the end of the bearing housing (1). A cooling water channel (6) is formed on the outer wall of the bearing housing (1). The bearing housing (1) is located inside the sealing ring (5), and the outer wall of the bearing housing (1) is interference-fitted with the inner wall of the sealing ring (5). The cooling water channel (6) is formed by the outer wall of the bearing housing (1) and the inner wall of the sealing ring (5). The stator end cover (2) is respectively formed with an inlet hole (7) and an outlet hole (8) communicating with the cooling water passage (6); the sealing ring (5) has two round holes. When the cooling water enters, it first enters through the inlet hole (7), then flows through one of the round holes, enters the cooling water passage (6), flows through the cooling water passage (6) and then flows through the other round hole, and finally exits through the outlet hole (8); The cooling water passage (6) includes multiple annular water grooves (61) opened on the outer wall of the bearing seat (1) and axial water grooves (62) opened along the axis of the bearing seat (1). The multiple annular water grooves (61) are connected through the axial water grooves (62). The water inlet (7) and water outlet (8) are coaxially arranged, and the opening directions of the water inlet (7) and water outlet (8) are opposite.

2. The cooling system for an external rotor motor according to claim 1, characterized in that: The diameter of the annular water tank (61) is 2 mm or more, and the diameter of the axial water tank (62) is more than 3 times the diameter of the annular water tank (61).

3. The cooling system for an external rotor motor according to claim 1, characterized in that: An insert (3) is installed inside the bearing housing (1), and a bearing chamber (9) is formed inside the insert (3).

4. The cooling system for an external rotor motor according to claim 3, characterized in that: The outer wall of the insert (3) is formed with external threads, and the insert (3) is threadedly engaged with the bearing seat (1).

5. The cooling system for an external rotor motor according to claim 4, characterized in that: The insert (3) is welded to the bearing housing (1).

6. The cooling system for an external rotor motor according to claim 1, characterized in that: The connection between the bearing housing (1) and the stator end cover (2) is sealed with glue.

7. The cooling system for an external rotor motor according to claim 1, characterized in that: The outer wall of the stator end cover (2) is provided with multiple heat dissipation fins (10).

8. The cooling system for an external rotor motor according to claim 1, characterized in that: The bearing housing (1) is made of aluminum profile 6061, the stator end cover (2) is made of cast aluminum ADC12, and the sealing ring (5) is made of Q235 ordinary carbon structural steel.

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