An oil cooled motor oil guide component

Abstract

The present embodiment discloses an oil cooled motor oil guide component. The oil guide component is set at both ends of the motor stator iron core. The oil guide component includes a substrate and a shoulder. The substrate is adhered to the end face of the stator iron core through a circular or arc-shaped installation surface. The shoulder is set on the side of the substrate away from the stator iron core and extends out of the substrate along the motor axis. By fitting the installation surface of the substrate with one end face of the stator core, as the first length is greater than the second length, the oil is blocked by the outer surface of the substrate along the radial direction of the stator core, and cannot flow into the air gap between the stator core and the rotor core; The oil continues to flow along the outer surface of the substrate and the shoulder, thus moving away from the air gap between the stator core and rotor core, greatly reducing the possibility of oil entering the air gap.

Description

[0001] Description

[0002] An oil cooled motor oil guide component

[0003] Technical field

[0004] The present invention relates to the field of motor cooling technology, in particular to an oil cooled motor oil guide component.

[0005] Background technology

[0006] With the continuous development of new energy vehicles, they have put forward higher requirements for the performance of electric drive systems. High speed, high power, high efficiency, and small volume are the main trends in current development; It can be understood that when an object does a lot of work in a small volume, it will inevitably accumulate a large amount of heat, so heat dissipation has become a necessary consideration when designing an electric drive system.

[0007] As is well known, the motor is a key component of the electric drive system, so the heat dissipation of the motor becomes the key to the heat dissipation of the electric drive system; The current mainstream motor adopts an oil cooling scheme, because the oil in the oil cooling scheme directly contacts the copper wire and iron core, which can take away more heat and enable the motor to achieve higher performance. At present, the oil cooling system for motors on the market usually opens oil holes in the stator yoke and can choose to set oil injection rings at both ends of the stator axis. When cooling the motor, the oil flows through the oil holes to forcibly cool the stator core and guide it into the two oil injection rings. The oil is sprayed out through the oil injection rings to cool the copper wires at the end of the stator; Alternatively, choose not to set the fuel injection ring and allow the oil to flow directly through the oil hole to the end copper wire for cooling. However, because the oil flows inside the motor, in the above two schemes, the oil inevitably flows along the surface of the stator core into the air gap of the stator and rotor. As the motor rotates, the friction between the rotor and the oil will cause significant oil stirring loss, leading to a decrease in the efficiency of the motor. i Therefore, there is an urgent need for a technology that can reduce oil entering the air gap of the stator and rotor.

[0008] Technical effects

[0009] The above one or more embodiments of the present invention have at least one or more beneficial effects as follows:

[0010] By fitting the installation surface of the substrate with one end face of the stator core, as the first length is greater than the second length, the oil is blocked by the outer surface of the substrate along the radial direction of the stator core, preventing the oil from flowing into the atmosphere between the stator core and the rotor core; The oil continues to flow along the outer surface of the substrate and the shoulder, thus moving away from the air gap between the stator core and rotor core, greatly reducing the possibility of oil entering the air gap.

[0011] Furthermore, by setting a guide surface on the shoulder, the oil can further deviate from the air gap, further reducing the possibility of oil entering the air gap.

[0012] Description Drawings

[0013] Figure 1 is an assembly diagram of an oil cooled motor oil guide component provided in an embodiment of the present invention inside the motor;

[0014] Figure 2 is an enlarged view of location A in Figure 1;

[0015] Figure 3 shows the assembly diagram of the structure in a motor without stator winding installed;

[0016] Figure 4 is an enlarged view at point B in Figure 3;

[0017] Figure 5 is a three-dimensional schematic diagram of the structure;

[0018] Figure 6 shows the left view of the structure;

[0019] Figure 7 shows a sectional view of the structure.

[0020] Description of the pictorial markers:

[0021] 1. Stator components; 11. Stator core; 12. Stator winding; 121. End winding wire; 2. Rotor core; 3. Air gap; 4. Matrix; 41. Installation surface; 42. Through perforation; 43. Remove duplicate holes; 5. Shoulder; 6. Balance plate. Embodiment

[0022] As described in the background technology, the commonly used motor oil cooling system in the market inevitably flows oil along the surface of the stator core into the air gap of the stator and rotor when cooling the end copper wire. As the motor rotates, the friction between the rotor and the oil will cause significant oil stirring loss, leading to a decrease in the efficiency of the motor.

[0023] To solve one or more of the technical problems mentioned above in the prior art, the present invention creatively proposes an oil cooled motor oil guide component. By adhering the substrate to one end face of the stator core, the oil is blocked by the outer surface of the substrate along the radial direction of the stator core due to the first length being greater than the second length, and cannot flow into the atmosphere between the stator core and the rotor core; The oil continues to flow along the outer surface of the substrate and the shoulder, thus moving away from the air gap between the stator core and rotor core, greatly reducing the possibility of oil entering the air gap and ensuring the efficiency of the motor.

[0024] The following will provide a specific explanation of the present invention through specific embodiments.

[0025] As shown in Figures 1 and 2, the motor comprises a stator component 1, a rotor core 2, and a stator component 1, which includes a stator core 11 and a stator winding 12. There is an air gap 3 between the stator core 11 and the rotor core 2. The stator winding 12 is located inside the stator core 11, and the two parts extending along the axial direction of the stator core 11 are both end winding wires 121. Oil flows through the oil guide component to pour the end winding wires 121.

[0026] The oil guide component is set at both ends of the motor stator core 11. The oil guide component includes a substrate 4 and a shoulder 5. The substrate 4 is connected to the stator core 11 , and the substrate 4 has an arc-shaped or annular installation surface 41. The substrate 4 is adhered to the end face of the stator core 11 through the installation surface 41, and the distance between the outer surface of the substrate 4 at both ends of the stator core 11 after adhesion is the first length; Shoulder 5, located on one side of the substrate 4 away from the stator core 11, and protruding along the motor axis from the substrate 4; There is an air gap 3 formed between stator core 11 and rotor core 2, which has a second length along the motor axis; The first length is greater than the second length.

[0027] Specifically, when the cooling oil enters the stator core 11 and sprays the end winding line 121 of the stator core 11 for cooling, the oil is affected by gravity and falls to the outer surface of the substrate 4. Due to the first length being greater than the second length, the oil is blocked by the outer surface of the substrate 4 and cannot enter the air gap 3 radially along the stator core 11. This causes the oil to change its flow direction and continue to flow until it is again affected by gravity and falls onto the shoulder 5. The oil continues to flow on the outer surface of the shoulder 5 and flows towards the end winding line 121, keeping the oil away from the air gap 3, greatly reducing the possibility of oil entering the air gap 3 and ensuring the efficiency of the motor.

[0028] For example, the installation surface 41 is curved, and the number of radians of the installation surface 41 is greater than 90 degrees but less than 360 degrees.

[0029] Specifically, if the installation surface 41 is curved, there is a gap in the circumferential direction of the substrate 4. Generally, when installing the oil guide component, the gap should be facing the ground (i.e. the installation base of the motor). It can be understood that even in extreme cases, if the installation surface 41 is changed to the installation line, that is, the installation line is tangent or in contact with the stator core, it is still within the range included in this oil guide component.

[0030] Preferably, shoulder 5 and substrate 4 are integrated to prevent oil leakage from between shoulder 5 and substrate 4.

[0031] For example, the inner wall of stator core 11 has multiple stator slots along its own circumference, and stator teeth are formed between adjacent stator slots. The stator winding 12 is wound on the stator core 11 through the stator teeth, with a portion of the stator winding 12 located inside and outside the stator slots; The two parts of stator winding 12 located outside the stator slot can be referred to as end winding line 121. For example, the motor includes a motor housing, which is equipped with an oil inlet hole. The stator core 11 includes a stator yoke, which is equipped with an oil passage (not shown in the figure) and runs through the stator yoke axially along the stator core 11. The oil passage is connected to the oil inlet hole, and the cooling oil enters the oil passage through the oil inlet hole and flows towards both ends of the stator yoke. During the flow process, the stator core 11 is cooled, and finally flows to the corresponding end winding line 121 through the ports at both ends of the oil passage to cool the end winding line 121.

[0032] Furthermore, the motor also includes a fuel injection ring, which is in a circular shape and is equipped with one at each end of the stator core 11. The fuel injection ring is equipped with an oil passage connected to the oil passage, and the inner ring wall of the fuel injection ring is uniformly distributed with multiple fuel injection holes along its own circumference. All fuel injection holes are connected to the oil passage. After entering the oil passage, the cooling oil flows into the oil passages of the two fuel injection rings, and then sprays and cools towards the end winding wire 121 through the fuel injection holes.

[0033] Preferably, as shown in Figures 3 and 4, the substrate 4 is circular in shape, with its axis parallel to the axis of the stator core 11 ;

[0034] And / or,

[0035] Shoulder 5 is circular in shape, with its axis parallel to the axis of stator core 11.

[0036] Among them, the dashed arrow in Figure 4 represents the flow direction of the oil.

[0037] In this embodiment, both the substrate 4 and the shoulder 5 are annular, and their axes are collinear with the axis of the stator core 11. While facilitating the installation of the structure, make it easy to set it along the circumferential direction of air gap 3, in order to minimize the entry of oil into air gap 3 and reduce oil stirring losses.

[0038] Preferably, as shown in Figures 5 to 7, the side of shoulder 5 away from stator core 11 is equipped with a guide surface, which is set as a conical surface. In this embodiment, the end of the guide surface near the stator core 11 is the first end, and the end away from the stator core is the second end. The second end is closer to the axis of the stator core 11 compared to the first end.

[0039] Specifically, when the oil flows to shoulder 5, the setting of the guide surface will make the oil more susceptible to gravity and slide, causing most of the oil to slide at a certain angle, making it easier for the oil to flow towards the end winding line 121 for cooling, while reducing the possibility of oil entering the air gap 3.

[0040] For example, the substrate 4 is bonded to the stator core 11. After applying adhesive point by point on the side of substrate 4 away from shoulder 5, press substrate 4 onto stator core 11 to complete installation.

[0041] For example, the substrate 4 is threaded or welded to the stator core 11.

[0042] For example, at least two through holes 42 are provided along the axial direction of the stator core 11 in substrate 4, and all through holes 42 are used for threading end winding wires 121.

[0043] Specifically, the number of through holes 42 corresponds to the number of stator slots for the winding of stator winding 12. After passing the enameled wire through the through hole 42, due to the process requirements of the stator itself, the enameled wire passing through the through hole 42 needs to undergo twisting and other operations. With the help of the component force of the twisting force in different directions of the enameled wire, the substrate 4 can be stably attached to the end wall of the stator core 11.

[0044] Furthermore, matrix 4 is provided with a de duplication hole 43.

[0045] Preferably, a weight removal hole 43 is opened on the side of the substrate 4 away from the stator core 11 to reduce the weight of the structure, thereby reducing the total weight of the motor, and facilitating the fixation of the structure.

[0046] Furthermore, on the side of the substrate 4 away from the stator core 11, multiple de duplication holes 43 are uniformly distributed along its own circumference, so that the center of mass of the structure falls on the axis of the substrate 4, that is, on the axis of the stator core 11; Make the force on each part of the structure relatively uniform during motor operation, improve the stability of the connection between the structure and the stator core 11 , and enable the structure to fully play its role.

[0047] The outermost distance between the two shoulders 5 is the third length; The two end faces of rotor iron core 2 are equipped with balance plates 6, which are in contact with the end faces of rotor iron core 2. After bonding, the distance between the outer sides of balance plates 6 at both ends of rotor iron core 2 is the fourth length; The third length is greater than the fourth length. Make the oil flow further along the outer surface of shoulder 5, reducing the possibility of oil splashing into the air gap 3 through balance plate 6.

[0048] Preferably, if the length of any end winding wire 121 along the axial direction of stator core 11 is a, then the total length of shoulder 5 and substrate 4 along the axial direction of stator core 11 is a / 3 to a / 2.

[0049] Specifically, in general, there are disc shaped balance plates 6 at both ends of the rotor axis to improve the efficiency of the motor, reduce noise and vibration, and enhance magnetic field strength and stability. The diameter of balance plate 6 is generally slightly smaller than the diameter of the rotor, which means that the distance between balance plate 6 and the air gap 3 of the stator and rotor is relatively close, and oil is easily splashed or slid into the air gap 3 of the stator and rotor through balance plate 6. And this structure sets the total length of the shoulder 5 and steps between a / 3 and a / 2, which fully covers the balance plate 6 and prevents oil from entering the air gap 3 of the stator and rotor while avoiding occupying too much internal space of the motor. At the same time, the guide surface set on shoulder 5 further reduces the gap between the structure and the balance plate, reducing the possibility of oil entering the air gap 3 of the stator and rotor. For example, if the minimum distance between stator winding 12 and the axis of stator core 11 is b, and the inner diameter of stator core 11 is c, then the maximum distance between shoulder 5 and the axis of stator core 11 is greater than c and less than b. By limiting the width range of shoulder 5 along the radial direction of stator core 11, to avoid interference between shoulder 5 and stator winding 12, or to reduce the blocking and guiding effect on the oil.

Claims

Claims1. An oil cooled motor oil guide component, wherein the oil guide component is set at both ends of the motor stator iron core, characterized in that:- the substrate has an arc-shaped or annular mounting surface, and the substrate is adhered to the end face of the stator iron core through the mounting surface, wherein, preferably after adhesion, the distance between the outer surface of the substrate at both ends of the stator iron core is the first length;- the shoulder is located on one side of the substrate away from the stator iron core, and protrudes along the motor axis from the substrate;- an air gap is formed between the stator core and the rotor core, and the air gap has a second length along the motor axis;- the first length is greater than the second length.

2. The oil cooled motor oil guide component according to claim 1, characterized in that the installation surface is arc-shaped, and the number of radians of the installation surface is greater than 90 degrees but less than 360 degrees.

3. The oil cooled motor oil guide component according to claim 1 or 2, characterized in that the substrate and shoulder are both annular, and its axis is parallel to the axis of the stator core.

4. The oil cooled motor oil guide component according to claim 2, characterized in that- the outermost distance between the two said shoulders is a third length;- he two end faces of the rotor iron core are equipped with balance plates, which are adhered to the end faces of the rotor iron core, wherein after adhesion, the distance between the outer sides of the balance plates at both ends of the rotor iron core is the fourth length;- The third length is greater than the fourth length.

5. The oil cooled motor oil guide component according to any of the preceding claims 1 , characterized in that a guide surface is provided on the side of the shoulder away from the axis of the stator iron core, and the guide surface is set as a conical surface.

6. The oil cooled motor oil guide component according to claim 1, characterized in that the substrate is provided with through holes along the axial direction of the stator core, all of which are used for threading end winding wires.

7. The oil cooled motor oil guide component according to any of the preceding claims, characterized in that the substrate is bonded to the stator iron core.

8. The oil cooled motor oil guide component according to any of the preceding claims, characterized in that the substrate is provided with a de duplication hole.

9. The oil cooled motor oil guide component according to any one of claims 1 to 8, characterized in that the length of the end winding wire on the stator core extending along the axial direction of the stator core to the end face of the stator core is a, and the distance between the shoulder and the end face of the stator core is a / 3 to a / 2.

10. The oil cooled motor oil guide component according to any of the preceding claims, characterized in that the inner diameter of the shoulder is less than or equal to the inner diameter of the stator core.

11. The oil cooled motor oil guide component according to any of the preceding claims, characterized in that the minimum distance between the end winding line on the stator core and the axis of the stator core is b, the inner diameter of the stator core is c, and the maximum distance between the shoulder and the axis of the stator core is greater than c and less than b.

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