Motor with Rotor Cooling Structure

Abstract

The present invention relates to an electric machine with a rotor cooling structure, comprising: a housing, a first channel being provided on the body of the housing; a first end cover, the first end cover having a second channel, the first channel and the second channel being connected through a hole; a rotating shaft, the rotating shaft having a third channel, the third channel being connected to the second channel through a hole; a rotor bracket, the rotor bracket being sleeved on the rotating shaft, the rotor bracket having a fourth channel, through holes being respectively formed on the outer peripheral surface of the rotating shaft and the outer peripheral surface of the rotor bracket so that the third channel is connected to the fourth channel; a rotor, the rotor being coupled to the rotor bracket; and a stator, the stator being coupled to the housing. In the electric machine with a rotor cooling structure according to the present invention, the channels are interconnected through holes and the stator cooling circuit and the rotor cooling circuit are connected, thereby shortening the distance from the rotor to the cooling circuit and improving the heat dissipation performance of the electric machine.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor with a rotor cooling structure. Background Art

[0002] Motors generate heat during operation. To ensure stable operation, effective cooling methods are required to properly control the motor's temperature. Traditional motor cooling methods include natural cooling, air cooling, water cooling, and oil cooling. All of these methods remove heat from the motor through a cooling medium. Water and oil cooling typically require a cooling circuit pre-installed in the motor casing. The coolant circulates through the cooling circuit to remove heat from the motor.

[0003] In the prior art, Figure 1 As shown, a cooling circuit is pre-installed in the casing of the motor. The cooling circuit is close to the stator, and the rotor away from the casing transfers heat to the stator through the air gap, and then conducts it to the casing, and the heat is taken away by the circulation of the coolant in the casing. Since the thermal conductivity of air is low and the thermal transfer resistance is large, and since the temperature of the stator core itself is high and the temperature gradient is small, the heat dissipation of the rotor will be greatly affected. In addition, the magnetic flux of the permanent magnet in the rotor will decrease significantly as the temperature rises, and there is a risk of demagnetization when the temperature exceeds a certain value. Therefore, in the prior art, the rotor core and the permanent magnet are far away from the cooling circuit pre-installed on the casing, resulting in poor heat dissipation performance inside the motor, which will greatly limit the performance of the permanent magnet and affect the performance and service life of the motor. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, one purpose of the present invention is to propose a motor with a rotor cooling structure, which aims to solve the problem that the cooling circuit in the existing motor is far away from the motor rotor, resulting in poor heat dissipation performance inside the motor and reduced magnetic flux of the permanent magnets in the rotor due to the high temperature inside the motor.

[0006] A motor with a rotor cooling structure according to an embodiment of the present invention includes: a housing having a first end face and a second end face oppositely arranged along the axial direction of the housing, a first hole is formed in the first end face along the axial direction of the housing, a first channel is provided on the body of the housing, and the first hole is communicated with the first channel; a first end cover detachably connected to the first end face of the housing, the first end cover has a second hole, a third hole and a second channel, the second hole is communicated with the first hole of the housing, the first channel of the housing is communicated with the second channel through the first hole and the second hole, and the third hole is communicated with the second channel; a second end cover detachably connected to the second end face of the housing, the second end cover, the first end cover and the housing jointly define an accommodation space; a rotating shaft accommodated in the accommodation space and rotatably supported on the first end cover and the second end cover by bearings, a first end of the rotating shaft extends out through the second end cover, a third channel is formed along the axis of the rotating shaft at a second end of the rotating shaft, and the third channel is communicated with the second channel through the third hole of the first end cover; a rotor bracket accommodated in the accommodation space, the rotor bracket is sleeved on the rotating shaft, the rotor bracket has a fourth channel, through holes are respectively formed on the outer peripheral surface of the rotating shaft and the outer peripheral surface of the rotor bracket so that the third channel is communicated with the fourth channel; a rotor accommodated in the accommodation space and sleeved on the outer peripheral surface of the rotor bracket; and a stator accommodated in the accommodation space and embedded in the inner peripheral surface of the housing.

[0007] In the motor with a rotor cooling structure according to an embodiment of the present invention, the first channel of the housing, the second channel of the first end cover, the third channel of the rotating shaft and the fourth channel of the rotor bracket are communicated with each other through a plurality of holes, thereby forming a complete cooling circuit. After the coolant passes through the cooling circuit, through heat exchange, the coolant can not only take out the heat of the stator from the inside of the motor, but also take out the heat of the rotor from the inside of the motor, greatly improving the cooling and heat dissipation performance of the motor and the service performance and service life of the components inside the motor.

[0008] In addition, the motor with a rotor cooling structure according to the above embodiment of the present invention may further have the following additional technical features.

[0009] In some embodiments, the first end cap includes a body, a "U"-shaped protrusion, and an annular protrusion. The "U"-shaped protrusion extends axially outward from the body, and the side surface of the "U"-shaped protrusion away from the center of the body extends beyond the outer peripheral surface of the body. The annular protrusion extends axially inward from the body, the inner hole of the annular protrusion communicates with the third hole, and a counterbore is formed in the end surface of the annular protrusion away from the body along the center line of the annular protrusion. Thus, not only can the overall structure of the first end cap be made compact, but also the weight of the end cap can be reduced, facilitating installation.

[0010] In some embodiments, the second channel of the first end cap is a "U"-shaped channel. The second channel includes a fourth hole, a fifth hole, and a sixth hole. The fourth hole and the sixth hole are parallelly formed on the side surface of the "U"-shaped protrusion away from the center of the first end cap body. The fifth hole is formed at the center of the bottom surface of the third hole along the axis of the first end cap. The third hole is directly communicated with the fourth hole, and the fifth hole is directly communicated with the sixth hole. Thus, the communication between the inside and the outside of the motor can be achieved.

[0011] In some embodiments, the third channel of the rotating shaft includes a seventh hole and an eighth hole. The seventh hole is formed at the center of the end surface of the rotating shaft close to the first end cap along the axis of the rotating shaft, and the eighth hole is formed at the center of the bottom of the seventh hole along the axis of the rotating shaft. The radial cross-sectional area of the seventh hole is larger than that of the eighth hole. Thus, it is beneficial to the machining of the holes and simplifies the machining process. At the same time, it is also convenient to divide the third channel into two inner cavities, which is conducive to the formation of a cooling circulation loop.

[0012] In some embodiments, the motor with a rotor cooling structure further includes a first thin-walled tube and a second thin-walled tube. The inner diameter of the first thin-walled tube is larger than the outer diameter of the second thin-walled tube, and the inner peripheral surface of the first thin-walled tube and the outer peripheral surface of the second thin-walled tube jointly define a gap. The first end of the first thin-walled tube extends into the seventh hole of the rotating shaft, and the second end of the first thin-walled tube extends into the third hole of the first end cap to communicate the inner cavities of the fourth hole of the second channel and the seventh hole of the third channel. The first end of the second thin-walled tube extends into the eighth hole of the rotating shaft, and the second end of the second thin-walled tube extends into the fifth hole of the first end cap to communicate the inner cavities of the sixth hole of the second channel and the eighth hole of the third channel. Thus, each channel can be interconnected, which is conducive to the formation of a cooling circulation loop.

[0013] In some embodiments, the motor with a rotor cooling structure further includes a first rotary seal and a second rotary seal. The inner ring of the first rotary seal is sleeved around the first thin-walled tube, and the first end of the first thin-walled tube is connected to the inner circumference of the seventh hole of the rotating shaft via the first rotary seal. The inner ring of the second rotary seal is sleeved around the second thin-walled tube, and the first end of the second thin-walled tube is connected to the inner circumference of the eighth hole of the rotating shaft via the second rotary seal. The first and second rotary seals not only ensure sealing at the joint, but the second rotary seal also divides the third channel into two inner cavities, thereby facilitating the formation of a cooling circulation loop.

[0014] In some embodiments, the rotor support is integrally formed by casting, thereby simplifying the manufacturing process and ensuring the continuity and sealing of the fourth channel of the rotor support.

[0015] In some embodiments, the rotor bracket is manufactured by welding, thereby saving manufacturing time and cost.

[0016] In some embodiments, the fourth channel of the rotor support is a U-shaped reciprocating channel. The fourth channel comprises a plurality of U-shaped channels arranged in a circular array at a predetermined distance around the central axis of the rotor support, with two adjacent U-shaped channels connected end to end and interconnected. This creates a complete U-shaped reciprocating cooling circuit within the rotor support to dissipate heat from the rotor.

[0017] In some embodiments, the rotor support has a ninth hole and a tenth hole, which are staggered circumferentially and respectively communicate with two adjacent "U"-shaped channels of the fourth channel. An eleventh hole is formed on the circumference of the seventh hole of the rotating shaft to communicate with the ninth hole of the rotor support. A twelfth hole is formed on the circumference of the eighth hole of the rotating shaft to communicate with the tenth hole of the rotor support. This allows for reciprocating circulation of coolant within the cooling channel.

[0018] The beneficial effects of the present invention are as follows: the overall structure of the present invention is compact, the distance from the cooling circuit to the rotor can be shortened, and the heat dissipation of the rotor can be effectively achieved, thereby improving the heat dissipation performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Further features and advantages of the present invention are described in the following description, which explains the present invention in more detail based on an embodiment in conjunction with the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of motor heat dissipation in the prior art.

[0021] Figure 2It is a schematic structural diagram of a motor with a rotor cooling structure according to an embodiment of the present invention.

[0022] Figure 3 It is a schematic diagram of the circulation of the coolant in the cooling circuit of a motor with a rotor cooling structure according to an embodiment of the present invention.

[0023] Figure 4 is Figure 3 A partial enlarged view of part A in

[0024] Figure 5 It is a three-dimensional structural diagram of the first end cover.

[0025] Figure 6 It is a sectional view of the first end cover.

[0026] Figure 7 It is a three-dimensional structural diagram of the rotor bracket.

[0027] Figure 8 It is a sectional view of the rotor bracket.

[0028] Figure 9 It is a structural diagram of the fourth channel on the rotor bracket.

[0029] Figure 10 It is a structural diagram of each part of the welded rotor bracket.

[0030] Figure 11 It is a structural diagram of the rotating shaft. Description of the drawings:

[0032] Motor 100;

[0033] Housing 1, first end face 11, second end face 12, first hole 13, first channel 14;

[0034] First end cover 2, second hole 21, third hole 22, second channel 23, fourth hole 231, fifth hole 232, sixth hole 233, first end cover body 24, "U"-shaped protrusion 25, annular protrusion 26, counterbore 261, inner hole 262;

[0035] Third end cover 3;

[0036] Rotor bracket 4, fourth channel 41, "U"-shaped channel 411, ninth hole 42, tenth hole 43, cylindrical part 44, support part 45, part 46 for cooperation with the rotating shaft;

[0037] Cylindrical part 44', fan-shaped through groove 441', notch 442', support part 45', part 46' for cooperation with the rotating shaft, annular cover plate 47';

[0038] Rotating shaft 5, third channel 51, seventh hole 511, eighth hole 512, eleventh hole 52, twelfth hole 53;

[0039] Rotor 6; stator 7;

[0040] Bearing 10; first rotary seal 20; first thin-walled tube 30; second thin-walled tube 40; second rotary seal 50;

[0041] Outlet pipe 60; plug 70;

[0042] Accommodating space B; gap C. Detailed implementation manners [[ID=...]] [[ID=...]]

[0043] The preferred implementation manners of the present invention will be described below with reference to the accompanying drawings. It should be noted that the terms "upper", "lower", "left", "right", "front", "rear" and similar expressions used herein are for illustrative purposes only and are not limitations on the present invention. [[ID=...]] [[ID=...]]

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined. [[ID=...]] [[ID=...]]

[0045] Reference [[ID=...]] Figure 2 and [[ID=...]] Figure 3 It should be noted that there are some tags like etc. which seem to be some kind of internal identifiers in a larger context and are left unchanged as per the requirement. Also, there are some tags with "..." in the ID which might be due to an incomplete or incorrect input format in the original, but they are left as they are in the translation., the motor 100 with a rotor cooling structure according to an embodiment of the present invention includes a housing 1. The housing 1 has a right end face 11 (as an example of the first end face) and a left end face 12 (as an example of the second end face) that are oppositely arranged along the axial direction of the housing 1. A first hole 13 is opened in the right end face 11 along the axial direction of the housing 1. A first channel 14 is provided on the body of the housing 1, and the first hole 13 communicates with the first channel 14; a right end cover 2 (as an example of the first end cover), the right end cover 2 is detachably connected to the right end face 11 of the housing 1. The right end cover 2 has a second hole 21, a third hole 22, and a second channel 23. The second hole 21 communicates with the first hole 13 of the housing 1. The first channel 14 of the housing 1 communicates with the second channel 23 through the first hole 13 and the second hole 21, and the third hole 22 communicates with the second channel 23; a left end cover 3 (as an example of the second end cover), the left end cover 3 is detachably connected to the left end face 12 of the housing 1. The left end cover 3, the right end cover 2, and the housing 1 jointly define an accommodation space B; a rotating shaft 5, the rotating shaft 5 is accommodated in the accommodation space B and is rotatably supported on the right end cover 2 and the left end cover 3 through bearings 10. The left end (as an example of the first end) of the rotating shaft 5 extends out through the left end cover 3. A third channel 51 is opened along the axis of the rotating shaft 5 at the right end (as an example of the second end) of the rotating shaft 5. The third channel 51 communicates with the second channel 23 through the third hole 22 of the right end cover 2; a rotor bracket 4, the rotor bracket 4 is accommodated in the accommodation space B. The rotor bracket 4 is sleeved on the rotating shaft 5. The rotor bracket 4 has a fourth channel 41. Through holes are respectively opened on the outer peripheral surface of the rotating shaft 5 and the outer peripheral surface of the rotor bracket 4 so that the third channel 51 communicates with the fourth channel 41; a rotor 6, the rotor 6 is accommodated in the accommodation space B and is sleeved on the outer peripheral surface of the rotor bracket 4; and a stator 7, the stator 7 is accommodated in the accommodation space B and is embedded in the inner peripheral surface of the housing 1.

[0046] In some embodiments, the inner peripheral surface of the rotor 6 and the outer peripheral surface of the rotor bracket 4 are in an interference fit. The rotor 6 can rotate with the rotating shaft 5 around the central axis of the rotating shaft. The outer peripheral surface of the stator 7 and the inner peripheral surface of the housing 1 are in an interference fit. The stator 7 is fixed on the housing 1. A certain gap is formed between the inner peripheral surface of the stator 7 and the outer peripheral surface of the rotor 6 to ensure that the rotor 6 does not interfere with the stator 7 when rotating.

[0047] In some embodiments, the first channel 14 of the housing 1 is a spiral channel. The spiral channel has an inlet end and an outlet end. Two holes are opened on the body of the housing 1 and are respectively connected to the inlet end and the outlet end of the spiral channel. The first hole 13 opened on the right end face 11 of the housing 1 is connected to the outlet end of the spiral channel. A hole is vertically opened on the outer peripheral surface of the housing 1 and is connected to the inlet end of the spiral channel. This facilitates injecting the coolant of the external cooling system into the interior of the first channel 14 through a water pipe.

[0048] In some embodiments, a sealing ring is provided at the connection between the first hole 13 of the housing 1 and the second hole 21 of the first end cap 2, thereby ensuring the sealing performance of the connection.

[0049] In some embodiments, a through hole is formed in the center of the left end cap 3, and the left end of the rotating shaft 5 extends out from the through hole; a counterbore is formed in the center of the right end face of the left end cap 3 for placing the bearing 10.

[0050] In the motor 100 with a rotor cooling structure according to an embodiment of the present invention, the first channel 14 of the housing 1, the second channel 23 of the right end cap 2, the third channel 51 of the rotating shaft 5, and the fourth channel 41 of the rotor bracket 4 are interconnected through a plurality of holes, thereby forming a complete cooling circuit. After the coolant passes through the cooling circuit, through heat exchange, the coolant can not only take out the heat of the stator 7 from the inside of the motor, but also take out the heat of the rotor 6 from the inside of the motor, greatly improving the cooling and heat dissipation performance of the motor and the service performance and service life of the components inside the motor.

[0051] In some embodiments, as Figure 5 and Figure 6 shown, the right end cap 2 includes a body 24, a "U"-shaped protrusion 25, and an annular protrusion 26. The "U"-shaped protrusion 25 extends axially from the left end face of the right end cap 2 towards the outside of the motor, and the side of the "U"-shaped protrusion 25 away from the center of the body 24 extends beyond the outer peripheral surface of the body 24; the annular protrusion 26 extends axially towards the inside of the motor, and the inner hole 262 of the annular protrusion 26 is communicated with the third hole 22 of the right end cap 2. A counterbore 261 is formed in the left end face of the annular protrusion 26 away from the body 24 along the center line of the annular protrusion 26 for placing the bearing 10. Thus, the overall structure of the right end cap 2 can be made compact, and the weight of the end cap can be reduced, facilitating installation.

[0052] In some embodiments, the body on the right end cap 2 is a cylinder, the central axis of the annular protrusion 26 is collinear with the central axis of the body 24, and the center line of the semi-circular shape on the "U"-shaped protrusion 25 is collinear with the central axis of the body 24.

[0053] In some embodiments, as Figure 2 and Figure 6As shown, the second channel 23 of the right end cover 2 is a "U"-shaped channel. The second channel 23 includes a fourth hole 231, a fifth hole 232, and a sixth hole 233. The fourth hole 231 and the sixth hole 233 are parallelly opened on the side of the "U"-shaped protrusion 25 away from the center of the right end cover body 24. The third hole 22 is a counterbore opened at the center of the body. The fifth hole 232 is opened at the center of the bottom surface of the third hole 22 of the right end cover 2 along the axial direction of the right end cover 2. The third hole 22 is directly communicated with the fourth hole 231, and the fifth hole 232 is directly communicated with the sixth hole 233. Thus, the communication between the inside and the outside of the motor can be realized. To facilitate the machining of the fourth hole 231, it needs to be opened on the side of the "U"-shaped protrusion 25. During use, the opening of the fourth hole 231 needs to be blocked by a plug 70, so that the "U"-shaped channel forms a single loop, which is convenient for taking out the coolant after circulating in the cooling channel from the motor.

[0054] In some embodiments, such as Figure 2 and Figure 11 As shown, the third channel 51 of the rotating shaft 5 includes a seventh hole 511 and an eighth hole 512. Both the seventh hole 511 and the eighth hole 512 are counterbores. The seventh hole 511 is opened at the center of the right end face of the rotating shaft 5 along the axial direction of the rotating shaft 5. The eighth hole 512 is opened at the center of the bottom of the seventh hole 511 along the axial direction of the rotating shaft 5. The radial cross-sectional area of the seventh hole 511 is larger than that of the eighth hole 512. Thus, it is beneficial to the machining of the holes and simplifies the machining process. At the same time, it is also convenient to divide the third channel 51 into two inner cavities, which is conducive to the formation of the cooling circulation loop.

[0055] In some embodiments, such as Figure 2 As shown, the motor 100 with a rotor cooling structure further includes a first thin-walled tube 30 and a second thin-walled tube 40. The inner diameter of the first thin-walled tube 30 is larger than the outer diameter of the second thin-walled tube 40. The second thin-walled tube 40 passes through the inner hole of the first thin-walled tube 30. The inner peripheral surface of the first thin-walled tube 30 and the outer peripheral surface of the second thin-walled tube 40 jointly define a gap C. The left end (as an example of the first end) of the first thin-walled tube 30 extends into the seventh hole 511 of the rotating shaft 5, and the right end (as an example of the second end) of the first thin-walled tube 30 extends into the third hole 22 of the right end cover 2 to communicate the inner cavities of the fourth hole 231 of the second channel 23 and the seventh hole 511 of the third channel 51. The left end (as an example of the first end) of the second thin-walled tube 40 extends into the eighth hole 512 of the rotating shaft 5, and the right end (as an example of the second end) of the second thin-walled tube 40 extends into the fifth hole 232 of the right end cover 2 to communicate the inner cavities of the sixth hole 233 of the second channel 23 and the eighth hole 512 of the third channel 51. Thus, it is beneficial to the formation of the cooling circulation loop.

[0056] In some embodiments, such as Figure 2As shown, the motor 100 with a rotor cooling structure further includes a first rotary seal 20 and a second rotary seal 50. The inner ring of the first rotary seal 20 is sleeved on the first thin-walled tube 30, and the left end of the first thin-walled tube 30 is connected to the inner peripheral surface of the seventh hole 511 of the rotating shaft 5 through the first rotary seal; the inner ring of the second rotary seal 50 is sleeved on the second thin-walled tube 40, and the left end of the second thin-walled tube 40 is connected to the inner peripheral surface of the eighth hole 512 of the rotating shaft 5 through the second rotary seal 50. The first rotary seal 20 and the second rotary seal 50 can not only ensure the sealing performance at the connection, but also the second rotary seal 50 can divide the third channel 51 into two inner cavities, which is beneficial to the formation of a cooling circulation loop.

[0057] In some embodiments, the outer peripheral surface of the first thin-walled tube 30 and the inner peripheral surface of the third hole 22 of the right end cover 2 are in interference fit. During assembly, sealant needs to be coated on the mating surfaces to ensure the sealing performance at the connection between the first thin-walled tube 30 and the third hole 22 and prevent leakage.

[0058] In some embodiments, the outer peripheral surface of the second thin-walled tube 40 and the inner peripheral surface of the fifth hole 232 of the right end cover 2 are in interference fit. Before assembly, sealant needs to be coated on the mating surfaces to ensure the sealing performance at the connection between the second thin-walled tube 40 and the fifth hole 232 and prevent leakage.

[0059] In some embodiments, as Figure 7 shown, the rotor bracket 4 is integrally formed by casting. Thus, not only the manufacturing process is simplified, but also the continuity and sealing performance of the fourth channel 41 of the rotor bracket 4 can be ensured.

[0060] In some embodiments, as Figure 10 shown, the rotor bracket 4 is made by welding. Thus, the time and cost of processing and manufacturing can be saved.

[0061] In some embodiments, as Figure 2 and Figure 9 shown, the fourth channel 41 of the rotor bracket 4 is a "U-shaped" circulating reciprocating channel. The fourth channel 41 includes several "U-shaped" channels 411. The "U-shaped" channels 411 are arranged in a circular array around the central axis of the rotor bracket 4 at a certain distance, and the head and tail of two adjacent "U-shaped" channels are connected and communicated. Thus, a complete "U-shaped" circulating reciprocating cooling loop can be formed inside the rotor bracket 4 to achieve the heat dissipation of the rotor 6.

[0062] In some embodiments, as Figure 2 and Figure 8As shown, the rotor bracket 4 has a ninth hole 42 and a tenth hole 43. The ninth hole 42 and the tenth hole 43 are circumferentially staggered on the rotor bracket 4 and are respectively communicated with two adjacent "U"-shaped channels 411 of the fourth channel 41. An eleventh hole 52 is formed on the circumferential surface of the seventh hole 511 of the rotating shaft 5 to communicate with the ninth hole 42 of the rotor bracket 4. A twelfth hole 53 is formed on the circumferential surface of the eighth hole 512 of the rotating shaft 5 to communicate with the tenth hole 43 of the rotor bracket 4. Thus, the circulation of the coolant in the cooling channel can be realized. After the coolant circulates in the fourth channel 41 of the rotor bracket 4, it flows into the eighth hole 512 of the rotating shaft 5 through the twelfth hole 53 and flows out of the sixth hole 233 of the first end cover 2 through the inner hole of the second thin-walled tube 40.

[0063] In some embodiments, as Figures 7 to 9 shown, the integrally cast rotor bracket 4 includes a cylindrical part 44, a supporting part 45, and a part 46 that cooperates with the rotating shaft 5. A sand core having the same shape as the fourth channel 41 is pre-placed in the cylindrical part during casting. After casting, two through sand holes are machined. After the sand core is vibrated and loosened, the sand grains flow out from the two sand holes, thereby forming a "U"-shaped circulating channel of the fourth channel 41. These two sand holes are the ninth hole 42 and the tenth hole 43 on the rotor bracket 4, which can not only pour out the sand grains but also communicate with the third channel 51 on the rotating shaft 5.

[0064] In some embodiments, as Figure 10 shown, the welded rotor bracket 4 includes a cylindrical part 44', a supporting part 45', a part 46' that cooperates with the rotating shaft 5, and two annular cover plates 47'. It is formed into a whole by welding. The fourth channel 41 is formed by machining. First, 8 sector-shaped through grooves 441' are pre-machined on the cylindrical part 44' along the axial direction of the rotor bracket. The sector-shaped through grooves 441' are arranged in an annular array at equal intervals around the central axis of the rotor bracket. A partition rib 442' is formed between two adjacent sector-shaped through grooves 441'. Notches 442' are machined in a staggered manner on the upper and lower adjacent partition ribs 442' so that two adjacent sector-shaped through grooves 441' are communicated. Finally, annular cover plates 47' are welded on both sides to axially seal the welded cylindrical part 44', supporting part 45', and part 46' that cooperates with the rotating shaft 5, thereby forming a rotor bracket with a "U"-shaped circulating channel. The welded rotor bracket can save the time and cost of processing and manufacturing, but the sealing performance of the "U"-shaped circulating channel needs to be ensured, so the requirements for the welding process are relatively high.

[0065] In some embodiments, the central axes of the housing 1, the right end cover 2, the left end cover 3, the rotor bracket 4, the rotating shaft 5, the rotor 6, the stator 7, the bearing 10, the first thin-walled tube 30, the second thin-walled tube 40, the first rotary seal 20, and the second rotary seal 50 are collinear.

[0066] In some embodiments, a sealing ring is provided at the connection between the ninth hole 42 on the rotor bracket 4 and the eleventh hole 52 on the rotating shaft 5. Similarly, a sealing ring is also provided at the connection between the tenth hole 43 on the rotor bracket 4 and the twelfth hole 53 on the rotating shaft 5, thereby ensuring the sealing performance of the connection and thus the sealing performance of the entire "U"-shaped cyclic reciprocating channel.

[0067] In some embodiments, a water outlet pipe 60 is provided at the opening of the sixth hole 233 of the right end cover 2 for discharging the coolant in the cooling circuit.

[0068] Next, refer to Figures 2 to 4 to describe the motor 100 with a rotor cooling structure according to an embodiment of the present invention.

[0069] As Figure 2 shown, the motor includes a housing 1, a right end cover 2, a left end cover 3, a rotor bracket 4, a rotating shaft 5, a rotor 6, a stator 7, bearings 10, a first thin-walled tube 30, a second thin-walled tube 40, a first rotary seal 20, a second rotary seal 50, a water outlet pipe 60, and a plug 70. Among them, the rotor 6 includes a rotor core and a permanent magnet, and the stator 7 includes a stator core and a copper wire winding.

[0070] Inject the coolant from the external cooling system into the inlet of the spiral channel on the motor housing 1 through a water pipe. After the coolant circulates in the housing 1, it flows into the second hole 21 on the right end cover 2 through the first hole 13 on the housing 1. Since a plug 70 is provided at the opening of the fourth hole 231, the coolant will flow unidirectionally from the fourth hole 231 into the third hole 22, and then flow into the inner cavity of the seventh hole 511 on the rotating shaft 5 through the gap C formed by the first thin-walled tube 30 and the second thin-walled tube 40. Then, it flows into the fourth channel 41 of the rotor bracket 4, that is, the "U"-shaped cyclic reciprocating channel, through the eleventh hole 52 on the rotating shaft 5 and the ninth hole 42 on the rotor bracket 4. After the coolant circulates in the "U"-shaped cyclic reciprocating channel, it flows into the inner cavity of the eighth hole 512 through the tenth hole 43 of the rotor bracket 4 and the twelfth hole 53 on the rotating shaft 5, and then flows into the fifth hole 232 of the right end cover 2 through the inner hole of the second thin-walled tube 40, and then passes through the sixth hole 233 of the second channel 23 and is discharged from the water outlet pipe 60.

[0071] In the motor 100 with a rotor cooling structure according to an embodiment of the present invention, the first channel 14 on the housing 1 is used for cooling and heat dissipation of the stator 7, and the fourth channel 41 on the rotor bracket 4 is used for cooling and heat dissipation of the rotor 6. Then, the first channel 14 and the fourth channel 41 are connected through the second channel 23 of the first end cover 2, the third channel 51 of the rotating shaft 5, and several holes, thereby realizing the cooling of the stator 7 and the rotor 6 at the same time, shortening the distance of the cooling circuit to the rotor 5, greatly improving the cooling and heat dissipation performance of the motor, thereby extending the service life of the internal components of the motor, and effectively solving the problem that the permanent magnet inside the rotor loses magnetism due to the high temperature inside the motor. In addition, sealing rings are provided at the joints of each channel or sealant is coated to ensure the tightness of the entire cooling circulation channel, prevent the leakage of the coolant, and avoid affecting the performance of the motor.

[0072] In the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0073] It is included in at least one embodiment or example of the present invention. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0074] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0075] The above are only the embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent structure made by using the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A motor with a rotor cooling structure, characterized in that, Comprising: A housing having a first end face and a second end face oppositely arranged along the axial direction of the housing. A first hole is formed in the first end face along the axial direction of the housing. A first channel is provided on the body of the housing, and the first hole communicates with the first channel; A first end cover detachably connected to the first end face of the housing. The first end cover has a second hole, a third hole and a second channel. The second hole communicates with the first hole of the housing. The first channel of the housing communicates with the second channel through the first hole and the second hole. The third hole communicates with the second channel; A second end cover detachably connected to the second end face of the housing. The second end cover, the first end cover and the housing jointly define an accommodation space; A rotating shaft accommodated in the accommodation space and rotatably supported on the first end cover and the second end cover by bearings. The first end of the rotating shaft extends out through the second end cover. A third channel is formed along the axis of the rotating shaft at the second end of the rotating shaft. The third channel communicates with the second channel through the third hole of the first end cover; A rotor bracket accommodated in the accommodation space. The rotor bracket is sleeved on the rotating shaft. The rotor bracket has a fourth channel. Through holes are respectively formed on the outer peripheral surface of the rotating shaft and the outer peripheral surface of the rotor bracket so that the third channel communicates with the fourth channel; A rotor accommodated in the accommodation space and sleeved on the outer peripheral surface of the rotor bracket; And A stator accommodated in the accommodation space and embedded in the inner peripheral surface of the housing.

2. The motor with a rotor cooling structure according to claim 1, characterized in that, The first end cover includes a body, a "U"-shaped protrusion and an annular protrusion. The "U"-shaped protrusion extends outward along the axial direction of the body. The side surface of the "U"-shaped protrusion away from the center of the body extends beyond the outer peripheral surface of the body. The annular protrusion extends inward along the axial direction of the body. The inner hole of the annular protrusion communicates with the third hole. A counterbore is formed on the end face away from the body along the center line of the annular protrusion.

3. The motor with a rotor cooling structure according to claim 2, characterized in that, The second channel of the first end cover is a "U"-shaped channel. The second channel includes a fourth hole, a fifth hole and a sixth hole. The fourth hole and the sixth hole are parallelly formed on the side surface of the "U"-shaped protrusion away from the center of the first end cover body. The fifth hole is formed at the center of the bottom surface of the third hole along the axial direction of the first end cover. The third hole directly communicates with the fourth hole. The fifth hole directly communicates with the sixth hole.

4. The motor with a rotor cooling structure according to claim 3, characterized in that, The third channel of the rotating shaft includes a seventh hole and an eighth hole. The seventh hole is formed at the center of the end face of the rotating shaft close to the first end cover along the axial direction of the rotating shaft. The eighth hole is formed at the center of the bottom of the seventh hole along the axial direction of the rotating shaft. The radial cross-sectional area of the seventh hole is larger than that of the eighth hole.

5. The motor with a rotor cooling structure according to claim 4, characterized in that, It further includes a first thin-walled tube and a second thin-walled tube. The inner diameter of the first thin-walled tube is larger than the outer diameter of the second thin-walled tube, and the inner peripheral surface of the first thin-walled tube and the outer peripheral surface of the second thin-walled tube jointly define a gap. The first end of the first thin-walled tube extends into the seventh hole of the rotating shaft, and the second end of the first thin-walled tube extends into the third hole of the first end cover to communicate the inner cavities of the fourth hole of the second channel and the seventh hole of the third channel. The first end of the second thin-walled tube extends into the eighth hole of the rotating shaft, and the second end of the second thin-walled tube extends into the fifth hole of the first end cover to communicate the inner cavities of the sixth hole of the second channel and the eighth hole of the third channel.

6. The motor with a rotor cooling structure according to claim 5, characterized in that, It further includes a first rotary seal and a second rotary seal. The inner ring of the first rotary seal is sleeved on the first thin-walled tube, and the first end of the first thin-walled tube is connected to the inner peripheral surface of the seventh hole of the rotating shaft through the first rotary seal. The inner ring of the second rotary seal is sleeved on the second thin-walled tube, and the first end of the second thin-walled tube is connected to the inner peripheral surface of the eighth hole of the rotating shaft through the second rotary seal.

7. The motor with a rotor cooling structure according to claim 1, characterized in that, The rotor bracket is integrally formed by casting.

8. The motor with a rotor cooling structure according to claim 1, characterized in that, The rotor bracket is made by welding.

9. The motor with a rotor cooling structure according to claim 4, characterized in that, The fourth channel of the rotor bracket is a "U-shaped" circulating reciprocating channel. The fourth channel includes a plurality of "U-shaped" channels, and the "U-shaped" channels are annularly arrayed around the central axis of the rotor bracket at a certain distance, and the heads and tails of two adjacent "U-shaped" channels are connected and communicated.

10. The motor with a rotor cooling structure according to claim 9, characterized in that, The rotor bracket has a ninth hole and a tenth hole. The ninth hole and the tenth hole are staggeredly opened in the circumferential direction of the rotor bracket and are respectively communicated with two adjacent "U-shaped" channels of the fourth channel. An eleventh hole is opened on the circumferential surface of the seventh hole of the rotating shaft to communicate with the ninth hole of the rotor bracket. A twelfth hole is opened on the circumferential surface of the eighth hole of the rotating shaft to communicate with the tenth hole of the rotor bracket.

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