Oil-cooled motor stator cooling structure and cooling method thereof

Abstract

The invention discloses an oil-cooled motor stator cooling structure and a cooling method thereof, and belongs to the technical field of motor cooling. The welding end of the stator core is connected with the welding end winding, the crown end is connected with the crown end winding, and the outer side is fixedly sleeved with the motor shell. A welding end oil ring is installed at the welding end of the motor shell, a crown end oil ring is installed at the crown end, and the two ends of the crown end oil ring are correspondingly attached to the motor shell and the stator iron core. Oil spraying holes are formed in the welding end oil ring and the crown end oil ring, an oil passing channel is arranged between the stator iron core and the motor shell, and the oil passing channel is communicated with the oil spraying holes. According to the invention, the distribution channel is constructed by combining the layout of the inclined oil injection holes and the bosses, so that the winding is uniformly sprayed in the whole circumferential direction, the local overheating phenomenon is eliminated, the spraying coverage range is flexibly adjusted, the invalid flow loss is reduced, the cooling efficiency is improved while the heat balance is guaranteed, the continuous service life of the flat wire motor is prolonged, and the bottleneck of the traditional design is broken through.

Description

Technical Field

[0001] The present invention relates to an oil-cooled motor stator cooling structure and a cooling method thereof, belonging to the technical field of motor cooling. Background Art

[0002] The existing oil-cooled motors have the following defects in the thermodynamic equilibrium design:

[0003] 1. The uneven distribution of the oil-cooling path of the stator winding leads to local overheating.

[0004] 2. The lack of a dynamic regulation mechanism for the distribution of the cooling media between the stator and the rotor results in ineffective flow loss.

[0005] 3. The traditional empirical cooling design method is difficult to meet the technical specifications of the national standards, directly leading to problems such as limited peak power output of the motor and energy efficiency loss.

[0006] In addition, as an emerging technology, the oil-cooling solution for flat wire motors is still in the exploration stage. There is a lack of a set of stator and rotor cooling strategies that are both efficient and reasonable in the market. Most of the existing cooling designs are based on experimental satisfaction, lacking precise quantitative standards and shaping specifications. This situation not only limits the full play of the motor performance but also leads to unnecessary energy consumption. Summary of the Invention

[0007] To solve the problems in the background art, the present invention provides an oil-cooled motor stator cooling structure and a cooling method thereof.

[0008] To achieve the above object, the present invention adopts the following technical solution: An oil-cooled motor stator cooling structure includes a motor housing, a welding end oil ring, a crown end oil ring, a welding end winding, a stator core, and a crown end winding; the welding end of the stator core is connected to the welding end winding, the crown end of the stator core is connected to the crown end winding, and the outer side of the stator core is fixedly sleeved with a motor housing with a gap; the welding end of the motor housing is fixedly installed with a welding end oil ring, the crown end of the motor housing is installed with a crown end oil ring, and both ends of the crown end oil ring are correspondingly attached to the motor housing and the stator core; the welding end oil ring and the crown end oil ring are both provided with oil injection holes, and an oil passage is provided between the stator core and the motor housing, and the oil passage is communicated with the oil injection holes.

[0009] An oil inlet is provided on the side wall of the motor housing, and a plurality of bosses are provided on the inner side wall of the motor housing. The inner side wall of the boss is attached to the outer side wall of the stator core, and an oil passage is formed between the inner side wall of the motor housing and the outer side wall of the stator core.

[0010] The end face of the welded-end oil ring in contact with the motor housing is provided with a cooling oil passage and two sealing ring grooves. The cooling oil passage is located between the two sealing ring grooves. The inner side wall of the cooling oil passage is provided with a plurality of welded-end oil spray holes penetrating the inner side wall of the welded-end oil ring. Each of the welded-end oil spray holes is located between two adjacent bosses.

[0011] The outer side wall of the crown-end oil ring is provided with a plurality of crown-end oil spray holes penetrating its inner side wall. Each of the crown-end oil spray holes is located between two adjacent bosses.

[0012] The cooling oil beams sprayed out from each of the welded-end oil spray holes and each of the crown-end oil spray holes are all arranged towards the axis of the motor.

[0013] Each of the welded-end oil spray holes and each of the crown-end oil spray holes are all inclined.

[0014] The plurality of welded-end oil spray holes and the plurality of crown-end oil spray holes are arranged in one-to-one correspondence in the axial direction.

[0015] A cooling method for the cooling structure of the oil-cooled motor stator of the present invention, the method comprising the following steps:

[0016] S1: Cooling oil enters the oil passage between the motor housing and the stator core through the oil inlet.

[0017] S2: The cooling oil contacts the outer surface of the stator core to cool the stator core.

[0018] S3: The cooling oil flows through the oil passage to the welded-end oil ring and the crown-end oil ring respectively.

[0019] S4: The cooling oil flows into the cooling oil passage of the welded-end oil ring.

[0020] S5: The cooling oil is sprayed through the welded-end oil spray holes to the axially central position of the welded-end winding, so that the welded-end winding of the motor is fully cooled.

[0021] S6: The cooling oil is sprayed through the crown-end oil spray holes to the axially central position of the crown-end winding, so that the crown-end winding of the motor is fully cooled.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. Through the layout of the inclined hole oil spray holes of the welded-end oil ring and the crown-end oil ring, and in combination with the diversion channels constructed by the annular array of bosses, the present invention realizes the full circumferential uniform spraying of the winding, effectively eliminating the phenomenon of local overheating.

[0024] 2. The present invention adopts a replaceable inclined oil injection hole design, which can flexibly adjust the spray coverage range and significantly reduce the loss of ineffective flow. The discontinuous stop positioning cooperates with double sealing rings to form a sealed cooling cavity, coordinating the dual paths of direct cooling on the outer surface of the stator core and spray cooling of the winding, ensuring thermal balance while improving the cooling efficiency.

[0025] 3. The present invention has been verified on the test bench, improving the peak power output of the motor, reducing the energy efficiency loss, extending the continuous working life of the flat wire motor, breaking through the bottleneck of traditional design, achieving a qualitative leap in the overall cooling performance of the system, providing an efficient and reliable solution for new energy vehicle motors, and promoting the technological upgrade of the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the present invention;

[0027] Figure 2 is Figure 1 the rear view of

[0028] Figure 3 is Figure 1 the front view of

[0029] Figure 4 is Figure 3 the A-A sectional view of

[0030] Figure 5 is Figure 1 the exploded view of

[0031] Figure 6 is a schematic diagram of the connection relationship among the motor housing, the welded end oil ring, and the crown end oil ring;

[0032] Figure 7 is a schematic structural diagram of the motor housing;

[0033] Figure 8 is a schematic structural diagram of the welded end oil ring;

[0034] Figure 9 is Figure 8 the rear view of

[0035] Figure 10 is a schematic structural diagram of the crown end oil ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] An oil-cooled motor stator cooling structure, comprising a motor housing 8, a welded-end oil ring 11, a crown-end oil ring 13, a welded-end winding 17, a stator core 18, and a crown-end winding 19; the welded end of the stator core 18 is connected to the welded-end winding 17, the crown end of the stator core 18 is connected to the crown-end winding 19, the motor housing 8 is fixedly sleeved with a clearance on the outer side of the stator core 18, and the stator core 18 is positioned and fixed to the motor housing 08 through multiple discontinuous rabbets; each rabbet is provided with a motor mounting hole 4 designed with internal threads for fixing the stator core 18 and the winding through bolts; the welded end of the motor housing 8 is fixedly installed with a welded-end oil ring 11, the crown end of the motor housing 8 is installed with a crown-end oil ring 13, and both ends of the crown-end oil ring 13 are correspondingly attached to the motor housing 8 and the stator core 18; the welded-end oil ring 11 and the crown-end oil ring 13 are both provided with oil injection holes, and an oil passage 5 is provided between the stator core 18 and the motor housing 8, and the oil passage 5 is communicated with the oil injection holes.

[0038] An oil inlet 1 is provided at the upper end of the side wall of the motor housing 8, and a plurality of bosses 2 arranged in a circumferential array are provided on the inner side wall of the motor housing 8 along its circumference, and the height of the bosses 2 is 3 mm. The inner side wall of the bosses 2 is attached to the outer side wall of the stator core 18, and an oil passage 5 is formed between the inner side wall of the motor housing 8 and the outer side wall of the stator core 18.

[0039] The end face of the welded-end oil ring 11 that fits with the motor housing 8 is provided with a cooling oil channel 14 and two sealing ring grooves 15 along its circumference, and a sealing ring is installed in each sealing ring groove 15. The depth of the sealing ring groove 15 is 0.5 mm, and the diameter of the sealing ring is 1 mm, which is used to seal the mating surface of the welded-end oil ring 11 and the motor housing 8. The cooling oil channel 14 is located between the two sealing ring grooves 15, and a plurality of welded-end oil injection holes 12 with a diameter of 1 mm penetrating the inner side wall of the welded-end oil ring 11 are evenly distributed along the circumference of the inner side wall of the cooling oil channel 14, and each welded-end oil injection hole 12 is located between two adjacent bosses 2.

[0040] A plurality of crown-end oil injection holes 16 with a diameter of 1 mm penetrating the inner side wall thereof are evenly distributed along the circumference of the outer side wall of the crown-end oil ring 13, and each crown-end oil injection hole 16 is located between two adjacent bosses 2.

[0041] The cooling oil beams 10 sprayed out from each welded-end oil injection hole 12 and each crown-end oil injection hole 16 are all arranged towards the axis of the motor.

[0042] Each of the welding-end oil injection holes 12 and each of the crown-end oil injection holes 16 are inclined. That is, the oil injection holes have a certain angle with the axial direction of the motor. Oil rings with different angle models are produced and then replaced according to the lengths of the welding-end winding 17 and the crown-end winding 19 to meet the cooling requirements of different motors.

[0043] The multiple welding-end oil injection holes 12 and the multiple crown-end oil injection holes 16 are arranged in one-to-one correspondence axially.

[0044] A cooling method for a stator cooling structure of an oil-cooled motor according to the present invention, the method comprising the following steps:

[0045] S1: Cooling oil enters the oil passage 5 between the motor housing 8 and the stator core 18 through the oil inlet 1;

[0046] S2: The cooling oil contacts the outer surface of the stator core 18 to cool the stator core 18;

[0047] S3: The cooling oil flows through the oil passage 5 to the welding-end oil ring 11 and the crown-end oil ring 13 respectively;

[0048] S4: The cooling oil flows into the cooling oil passage 14 of the welding-end oil ring 11;

[0049] S5: The cooling oil is sprayed through the welding-end oil injection holes 12 to the axially central position of the welding-end winding 17, so that the welding-end winding of the motor is fully cooled;

[0050] S6: The cooling oil is sprayed through the crown-end oil injection holes 16 to the axially central position of the crown-end winding 19, so that the crown-end winding of the motor is fully cooled.

[0051] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent conditions of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claims.

[0052] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An oil-cooled motor stator cooling structure, comprising a motor housing (8), a welded end winding (17), a stator core (18), and a crown end winding (19); the welded end of the stator core (18) is connected to the welded end winding (17), the crown end of the stator core (18) is connected to the crown end winding (19), and the motor housing (8) is fixedly sleeved with a clearance on the outer side of the stator core (18); characterized in that: The cooling structure further includes a welded-end oil ring (11) and a crown-end oil ring (13); the welded-end oil ring (11) is fixedly installed at the welded end of the motor housing (8), and the crown-end oil ring (13) is installed at the crown end of the motor housing (8). The two ends of the crown-end oil ring (13) are correspondingly attached to the motor housing (8) and the stator core (18); both the welded-end oil ring (11) and the crown-end oil ring (13) are provided with oil spray holes, and an oil passage (5) is provided between the stator core (18) and the motor housing (8), and the oil passage (5) is communicated with the oil spray holes.

2. The stator cooling structure of an oil-cooled motor according to claim 1, characterized in that: An oil inlet (1) is provided on the side wall of the motor housing (8), and a plurality of bosses (2) are provided on the inner side wall of the motor housing (8). The inner side wall of the boss (2) is attached to the outer side wall of the stator core (18), and an oil passage (5) is formed between the inner side wall of the motor housing (8) and the outer side wall of the stator core (18).

3. The stator cooling structure of an oil-cooled motor according to claim 2, characterized in that: The end face of the welded-end oil ring (11) attached to the motor housing (8) is provided with a cooling oil channel (14) and two seal ring grooves (15). The cooling oil channel (14) is located between the two seal ring grooves (15). The inner side wall of the cooling oil channel (14) is provided with a plurality of welded-end oil spray holes (12) penetrating the inner side wall of the welded-end oil ring (11), and each welded-end oil spray hole (12) is located between two adjacent bosses (2).

4. The stator cooling structure of an oil-cooled motor according to claim 3, characterized in that: The outer side wall of the crown-end oil ring (13) is provided with a plurality of crown-end oil spray holes (16) penetrating its inner side wall, and each crown-end oil spray hole (16) is located between two adjacent bosses (2).

5. The stator cooling structure of an oil-cooled motor according to claim 4, characterized in that: The cooling oil beams (10) sprayed out by each welded-end oil spray hole (12) and each crown-end oil spray hole (16) are all arranged towards the axis of the motor.

6. The stator cooling structure of an oil-cooled motor according to claim 4, characterized in that: Each welded-end oil spray hole (12) and each crown-end oil spray hole (16) are inclined.

7. An oil-cooled motor stator cooling structure according to claim 5 or 6, characterized in that: The plurality of welded-end oil spray holes (12) and the plurality of crown-end oil spray holes (16) are arranged in one-to-one correspondence in the axial direction.

8. A cooling method for the oil-cooled motor stator cooling structure according to any one of claims 1-7, characterized in that: The method includes the following steps: S1: Cooling oil enters the oil passage (5) between the motor housing (8) and the stator core (18) through the oil inlet (1); S2: The cooling oil contacts the outer surface of the stator core (18) to cool the stator core (18); S3: The cooling oil flows through the oil passage (5) to the welded-end oil ring (11) and the crown-end oil ring (13) respectively; S4: The cooling oil flows into the cooling oil channel (14) of the welded-end oil ring (11); S5: The cooling oil is sprayed to the axially central position of the welded-end winding (17) through the welded-end oil spray holes (12), so that the welded-end winding of the motor is fully cooled; S6: The cooling oil is sprayed to the axially central position of the crown-end winding (19) through the crown-end oil spray holes (16), so that the crown-end winding of the motor is fully cooled.

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