Motor, electric drive system and vehicle

Abstract

The utility model provides a motor, an electric drive system and a vehicle, the motor comprises a stator iron core and a flat wire winding, the stator iron core is provided with a winding groove, and the winding groove passes through two axial ends of the stator iron core; the flat wire winding penetrates through the winding groove, and the winding groove is provided with a notch communicated with the inner side wall of the stator core; a first oil cooling channel is arranged between the flat wire winding and the notch; the winding grooves are provided with the central axes extending in the radial direction of the stator iron core, and the groove openings are eccentrically arranged relative to the central axes, so that the circulation cross section of the oil cooling channel is increased, the flow of cooling oil is improved, and the cooling effect on the flat wire winding is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor cooling, and in particular to a motor, an electric drive system and a vehicle. Background Art

[0002] With the rapid popularization of new energy vehicles, electric drive systems are developing rapidly towards high power density, low cost, high integration and high efficiency. Under this trend, high power density requires high motor power and compact size. However, the internal heat of high power density motors is difficult to dissipate effectively, resulting in motor overheating, which in turn causes irreversible component damage and rotor demagnetization.

[0003] In the related technologies, the traditional water cooling method can no longer meet the heat dissipation requirements. At present, oil cooling technology has gradually become the preferred solution for cooling the motors of new energy vehicles due to its excellent insulation properties. The cooling oil is sprayed to the outside of the stator and the end of the winding through the spray pipe or spray ring, and the heat on the stator is removed by the flow of cooling oil.

[0004] However, in the current heat dissipation method of the motor, the contact area between the cooling oil and the stator is small, and the heat dissipation effect is poor. Utility Model Content

[0005] The utility model provides a motor, an electric drive system and a vehicle, so as to solve the technical problem that in the current heat dissipation mode of the motor, the contact surface between the cooling oil and the stator is small and the heat dissipation effect is poor.

[0006] In a first aspect, the utility model provides a motor, which includes a stator core and a flat wire winding. The stator core has a winding slot, which runs through both axial ends of the stator core; the flat wire winding is inserted into the winding slot.

[0007] The winding slot has a notch communicating with the inner side wall of the stator core; a first oil cooling channel is provided between the flat wire winding and the notch; and the notch is eccentrically arranged relative to the central axis of the winding slot extending radially along the stator core.

[0008] The motor provided in the present application forms an oil cooling channel in the winding slot of the stator core to cool the flat wire winding, and the eccentric setting of the slot increases the flow cross-section of the oil cooling channel, increases the flow rate of the cooling oil, and thereby improves the cooling effect on the flat wire winding.

[0009] As an optional implementation, the width of the slot may be smaller than the width of the interior of the winding slot.

[0010] With such an arrangement, a narrowed trumpet-shaped structure can be formed at the notch, so that the first oil cooling channel can guide the flow of cooling oil.

[0011] As an optional embodiment, the first oil cooling channel may include a first side wall, a second side wall, a third side wall and a fourth side wall; the first side wall is opposite to the third side wall, and the second side wall is opposite to the fourth side wall; the first side wall is formed on one side surface of the flat wire winding facing the slot; the slot is located between the third side wall and the fourth side wall.

[0012] With such arrangement, the inner wall of the winding slot on the stator core and the surface of the flat wire winding can be used to enclose and form the first oil cooling channel, thereby increasing the flow cross section of the first oil cooling channel.

[0013] As an optional implementation, the first side wall is parallel to the third side wall; a limiting step may be formed between the fourth side wall and the slot wall of the winding slot, and one end of the flat wire winding facing the slot opening may abut against the limiting step.

[0014] Such an arrangement can improve the stability of the installation of the flat wire winding in the winding slot.

[0015] As an optional implementation, the cross-sectional shape of the first oil cooling channel may be any one of a parallelogram, an ellipse, a square, and a trapezoid.

[0016] Such an arrangement can increase the cross-sectional area of ​​cooling oil flow while improving the smoothness of cooling oil flow.

[0017] As an optional embodiment, the flat wire winding may include multiple winding wires, which are arranged in sequence from the slot opening to the bottom of the winding slot; the multiple winding wires are parallel to each other, and the winding wires are inclined relative to the width direction of the winding slot.

[0018] With such an arrangement, the space in the winding slot can be fully utilized, so that a gap can be formed between the winding wire and the slot wall of the winding slot at the slot opening to form the first oil cooling channel.

[0019] As an optional implementation, one end of the flat wire winding away from the slot opening and the bottom of the winding slot may be surrounded to form a second oil cooling channel, and the second oil cooling channel may pass through both ends of the axis of the stator core.

[0020] Such an arrangement can improve the oil cooling and heat dissipation effect of the flat wire winding in the bottom area of ​​the winding slot.

[0021] As an optional implementation, the motor may further include insulating paper, which is attached to the winding groove and covers the groove wall of the winding groove.

[0022] Such an arrangement ensures good insulation performance between the flat wire winding and the stator core.

[0023] In a second aspect, the present application provides an electric drive system, which includes the motor in the above technical solution.

[0024] In a third aspect, the present application provides a vehicle, which may include the electric drive system in the above technical solution.

[0025] The utility model provides a motor, which comprises a stator core and a flat wire winding, wherein the stator core has a winding groove, the winding groove runs through the two axial ends of the stator core; the flat wire winding is passed through the winding groove, the winding groove has a notch communicated with the inner side wall of the stator core; a first oil cooling channel is provided between the flat wire winding and the notch; the winding groove has a central axis extending along the radial direction of the stator core, the notch is eccentrically arranged relative to the central axis, the flow cross section of the oil cooling channel is increased, the flow rate of the cooling oil is increased, and the cooling effect on the flat wire winding is improved.

[0026] In addition to the technical problems solved by the embodiments of the present application described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by the motor, electric drive system and vehicle provided by the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic diagram of the assembly of the stator core and the flat wire winding in the motor provided in the embodiment of the present application;

[0029] Figure 2 A side view of a stator core and a flat wire winding in a motor provided in an embodiment of the present application;

[0030] Figure 3 A top view of a stator core and a flat wire winding in a motor provided in an embodiment of the present application;

[0031] Figure 4 A schematic diagram of the structure of a stator core in a motor provided in an embodiment of the present application;

[0032] Figure 5 for Figure 3 Partial view of position A in the middle.

[0033] Description of reference numerals:

[0034] 100- stator core;

[0035] 110-winding groove;

[0036] 111-notch;

[0037] 120-first oil cooling channel;

[0038] 121- first side wall;

[0039] 122- second side wall;

[0040] 123- third side wall;

[0041] 124- fourth side wall;

[0042] 130-limited steps;

[0043] 140- second oil cooling channel;

[0044] 200-flat wire winding;

[0045] 210-winding wire;

[0046] 300-Insulation paper. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0048] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0049] Secondly, it should be noted that in the description of the present application, terms such as "front", "rear", "left", "right", "up", "down", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present application.

[0050] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0052] At present, the electric drive system of new energy vehicles is developing rapidly in the direction of high power density, low cost, high integration and high efficiency. Under this trend, high power density requires the motor to have high power and compact size. However, the internal heat of high power density motors is difficult to dissipate effectively, resulting in motor overheating, which in turn causes irreversible component damage and rotor demagnetization. Traditional water cooling methods can no longer meet the heat dissipation requirements. At present, oil cooling technology has gradually become the preferred solution for cooling motors in new energy vehicles due to its excellent insulation properties. The cooling oil is sprayed onto the outside of the stator and the end of the winding through an oil spray pipe or an oil spray ring, and the heat on the stator is taken away by the flow of cooling oil. However, in the current heat dissipation method of the motor, the contact surface between the cooling oil and the stator is small, and the heat dissipation effect is poor.

[0053] In response to the above problems, the embodiments of the present application provide a motor, an electric drive system and a vehicle. By designing a heat dissipation structure in the winding slot of the stator core of the motor, an oil cooling channel is formed inside the winding slot. The cooling oil flowing through the oil cooling channel can directly flow through the surface of the winding in the winding slot, thereby taking away the heat of the winding and improving the heat dissipation efficiency of the winding in the winding slot.

[0054] The technical solution of the present application will be described in detail below through specific embodiments.

[0055] Figure 1 This is a schematic diagram of the assembly of the stator core and the flat wire winding in the motor provided in the embodiment of the present application. Figure 2 A side view of a stator core and a flat wire winding in a motor provided in an embodiment of the present application, Figure 3 A top view of a stator core and a flat wire winding in a motor provided in an embodiment of the present application, Figure 4This is a schematic diagram of the structure of the stator core of the motor provided in the embodiment of the present application. Figure 5 for Figure 3 Partial view of position A in the middle.

[0056] like Figures 1 to 5 As shown, the embodiment of the present application provides a motor, which includes a stator core 100 and a flat wire winding 200 . The stator core 100 has a winding slot 110 , and the winding slot 110 passes through both axial ends of the stator core 100 . The flat wire winding 200 is disposed in the winding slot 110 .

[0057] The winding slot 110 has a notch 111 connected to the inner wall of the stator core 100, and a first oil cooling channel 120 is provided between the flat wire winding 200 and the notch 111. When the motor is working, cooling oil can enter the first oil cooling channel 120 and flow along the first oil cooling channel 120. The cooling oil flowing through the first oil cooling channel 120 can take away the heat on the stator core 100 and the flat wire winding 200, thereby achieving the effect of heat dissipation and cooling of the stator core 100 and the flat wire winding 200.

[0058] In some embodiments, the winding slot 110 has a central axis extending radially along the stator core 100, and the notch 111 is eccentrically arranged relative to the central axis. Since the first oil cooling channel 120 is arranged close to the notch 111, and the notch 111 is arranged offset relative to the inside of the winding slot 110, the first oil cooling channel 120 can have a larger flow cross-section at the end of the winding slot 110 facing the notch 111, and thus when the cooling oil flows through the oil cooling channel, more heat can be taken away, thereby improving the heat dissipation efficiency.

[0059] It should be noted that in the motor provided in the embodiment of the present application, an oil cooling channel is formed in the winding slot 110 of the stator core 100, and the inner wall of the oil cooling channel is formed by the slot wall of the winding slot 110 and the surface of the flat wire winding 200. The cooling oil is circulated in the slot space of the winding slot 110 to cool the stator core 100 and the flat wire winding 200, and the eccentric setting of the slot 111 increases the flow cross-section of the oil cooling channel, increases the flow rate of the cooling oil, and thereby improves the cooling effect on the flat wire winding 200.

[0060] In addition, since the flat wire winding 200 is inserted into the winding slot 110, that is, the flat wire winding 200 passes through the winding slot 110 along the axial direction of the stator core 100, the first oil cooling channel 120 formed by the surface of the flat wire winding 200 facing the slot 111 and the inner wall of the winding slot 110 at one end close to the slot 111 extends along the axial direction of the stator core 100. When the cooling oil flows through the first oil cooling channel 120, the cooling oil can flow through various positions of the flat wire winding 200 extending along the axial direction of the stator core 100, which has a good heat dissipation effect.

[0061] The specific structure of the first oil cooling channel 120 is described in detail below.

[0062] Please continue to refer to Figures 1 to 5 As an optional embodiment, the width of the slot 111 may be smaller than the width inside the winding slot 110 , so that a narrowed trumpet-shaped structure may be formed at the slot 111 , so that the first oil cooling channel 120 may guide the flow of cooling oil.

[0063] It is understandable that the stator core 100 can be an annular columnar structure, the notch 111 of the winding slot 110 is located in the inner ring of the stator core 100, and the outer contour and inner contour of the radial cross section of the stator body are both circular. The embodiment of the present application does not limit the size value of the specific contour diameter of the stator core 100.

[0064] There may be multiple winding slots 110, which are evenly spaced around the circumference of the stator core 100, and the slot 111 of each winding slot 110 is eccentrically arranged relative to the central axis of the corresponding winding slot 110, and each slot 111 is eccentrically arranged in the same direction.

[0065] It should be noted that in the motor provided in the embodiment of the present application, a cooling groove can be provided on the circumferential outer side of the stator core 100, and cooling oil can also flow through the cooling groove, thereby increasing the contact area between the cooling oil and the stator core 100 when the cooling oil flows through the stator core 100, thereby improving the heat dissipation effect.

[0066] In some embodiments, the first oil cooling channel 120 may include a first side wall 121, a second side wall 122, a third side wall 123, and a fourth side wall 124. The first side wall 121 is opposite to the third side wall 123, and the second side wall 122 is opposite to the fourth side wall 124. When the cooling oil flows through the first oil cooling channel 120, it contacts the first side wall 121, the second side wall 122, the third side wall 123, and the fourth side wall 124.

[0067] It can be understood that the first side wall 121 is formed on one side surface of the flat wire winding 200 facing the slot 111, and the slot 111 is located between the third side wall 123 and the fourth side wall 124. In this way, the inner wall of the winding slot 110 on the stator core 100 and the surface of the flat wire winding 200 can be used to enclose and form the first oil cooling channel 120, thereby increasing the flow cross section of the first oil cooling channel 120.

[0068] In some embodiments, the first side wall 121 can be parallel to the third side wall 123, and a limiting step 130 can be formed between the fourth side wall 124 and the slot wall of the winding slot 110, so that the structure of the stator core 100 on both sides of the slot 111 has good structural strength to avoid bumps and defects.

[0069] It is understandable that one end of the flat wire winding 200 facing the slot 111 can abut against the limiting step 130, thereby improving the stability of the flat wire winding 200 installed in the winding slot 110. In addition, the limiting step 130 allows a certain distance between the side of the flat wire winding 200 facing the slot 111 and the slot 111, thereby forming a first oil cooling channel 120 with a certain size of space between the plug and the flat wire winding 200.

[0070] For example, the cross section of the first oil cooling channel 120 may be a parallelogram, so as to increase the cross-sectional area of ​​the cooling oil flow and improve the smoothness of the cooling oil flow. The first side wall 121 is parallel to the third side wall 123 , and the second side wall 122 is parallel to the fourth side wall 124 .

[0071] It should be noted that the shape structure of the cross-section of the first oil cooling channel 120 may also include but is not limited to ellipse, square, trapezoid, pentagon, etc. It is only necessary to utilize the stator core 100 structure on both sides of the slot 111 to ensure that the stator core 100 has sufficient structural strength at the slot 111 position of the winding slot 110. The embodiment of the present application does not make specific limitations on this.

[0072] In a possible implementation, the flat wire winding 200 may include a plurality of winding wires 210, and the plurality of winding wires 210 are arranged in sequence from the notch 111 to the bottom of the winding groove 110. The plurality of winding wires 210 may be parallel to each other, and the winding wires 210 may be arranged obliquely relative to the width direction of the winding groove 110. In this way, the space in the winding groove 110 may be fully utilized, so that the winding wires 210 and the groove wall of the winding groove 110 may form a gap at the notch 111 to form the first oil cooling channel 120.

[0073] It can be understood that the inclination angles of multiple winding wires 210 in the same winding slot 110 can be the same. The inclined winding wires 210 can make full use of the space in the winding slot 110, ensuring that the motor has good performance while improving the space utilization rate in the winding slot 110, so that the stator core 100 and the flat wire winding 200 have better heat dissipation effect.

[0074] For example, the angle at which the winding wire 210 is inclined relative to the width direction of the winding slot 110 may be greater than or equal to 10° and less than or equal to 40°. For example, the angle at which the winding wire 210 is inclined relative to the width direction of the winding slot 110 may include but is not limited to 10°, 11°, 20°, 30°, 39°, 40°, etc., which is not specifically limited in the embodiments of the present application.

[0075] In some embodiments, one end of the flat wire winding 200 away from the slot 111 and the bottom of the winding slot 110 can be surrounded to form a second oil cooling channel 140. The second oil cooling channel 140 can pass through both ends of the axis of the stator core 100, thereby improving the oil cooling and heat dissipation effect of the flat wire winding 200 in the bottom area of ​​the winding slot 110.

[0076] It can be understood that the first oil cooling channel 120 and the second oil cooling channel 140 are respectively located at the two ends of the winding slot 110 along the radial direction of the stator core 100. After the cooling oil enters the motor, it can enter the first oil cooling channel 120 and the second oil cooling channel 140 at the same time, and dissipate heat for the flat wire winding 200 at the same time.

[0077] As an optional implementation, the motor may further include insulating paper 300 , which is attached to the winding slot 110 and covers the slot wall of the winding slot 110 , thereby ensuring good insulation performance between the flat wire winding 200 and the stator core 100 .

[0078] The insulating paper 300 may be pasted on the groove wall of the winding groove 110 .

[0079] In some embodiments, the motor may further include a shell, and the stator core 100 and the flat wire winding 200 may both be disposed in the shell, the shell having an oil inlet and an oil outlet, the cooling oil may enter the interior of the shell from the oil inlet, and at least part of the cooling oil may enter the first oil cooling channel 120 and the second oil cooling channel 140 from one end of the stator core 100, the cooling oil flowing through the first oil cooling channel 120 and the second oil cooling channel 140 may flow out from the other end of the stator core 100, and the oil outlet is disposed at a position opposite to the shell and the end of the stator core 100 where the cooling oil flows out.

[0080] The embodiment of the present application provides a motor, which includes a stator core 100 and a flat wire winding 200. The stator core 100 has a winding groove 110, which runs through the axial ends of the stator core 100; the flat wire winding 200 is inserted into the winding groove 110, and the winding groove 110 has a notch 111 connected to the inner wall of the stator core 100; a first oil cooling channel 120 is provided between the flat wire winding 200 and the notch 111; the winding groove 110 has a central axis extending along the radial direction of the stator core 100, and the notch 111 is eccentrically arranged relative to the central axis, thereby increasing the flow cross-section of the oil cooling channel, increasing the flow rate of the cooling oil, and thereby improving the cooling effect of the flat wire winding 200.

[0081] The embodiment of the present application also provides an electric drive system, which includes the motor in the above technical solution. The motor can be integrated in the electric drive system, and the electric drive system can also include a housing, a reducer, a controller, and a cooling structure. The output shaft of the motor is connected to the reducer, and the rotation of the motor is output through the reducer. The controller can be used to control the operation of the motor and transmit control signals to the outside.

[0082] It should be noted that the electric drive system provided in the embodiment of the present application has all the technical solutions and all the technical effects of the aforementioned motor, which will not be repeated here. The electric drive system can have multiple control functions in one, including but not limited to vehicle control, motor control, high and low voltage conversion, battery management, etc., which are not specifically limited in the embodiment of the present application.

[0083] The embodiment of the present application also provides a vehicle, which may include the electric drive system in the above technical solution. The vehicle provided in the embodiment of the present application may be a new energy vehicle, including but not limited to a pure electric vehicle, a hybrid electric vehicle, a hydrogen energy vehicle, etc., which is not specifically limited in the embodiment of the present application.

[0084] The vehicle provided in the embodiment of the present application has all the technical solutions and all the technical effects of the aforementioned motor, which will not be repeated here.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A motor, characterized in that: It comprises a stator core and a flat wire winding, wherein the stator core has a winding slot, and the winding slot passes through the two axial ends of the stator core; the flat wire winding is passed through the winding slot; The winding slot has a notch communicating with the inner side wall of the stator core; a first oil cooling channel is provided between the flat wire winding and the notch; the notch is eccentrically arranged relative to the central axis of the winding slot extending radially along the stator core.

2. The motor according to claim 1, characterized in that The width of the notch is smaller than the width of the interior of the winding groove.

3. The motor according to claim 1, characterized in that The first oil cooling channel includes a first side wall, a second side wall, a third side wall and a fourth side wall; the first side wall is opposite to the third side wall, and the second side wall is opposite to the fourth side wall; the first side wall is formed by a side surface of the flat wire winding facing the slot; the slot is located between the third side wall and the fourth side wall.

4. The motor according to claim 3, characterized in that The first side wall is parallel to the third side wall; a limiting step is formed between the fourth side wall and the groove wall of the winding groove, and one end of the flat wire winding facing the groove is in contact with the limiting step.

5. The motor according to any one of claims 1 to 4, characterized in that: The cross-sectional shape of the first oil cooling channel is any one of a parallelogram, an ellipse, a square, and a trapezoid.

6. The motor according to any one of claims 1 to 4, characterized in that: The flat wire winding includes a plurality of winding wires, which are arranged in sequence from the slot opening to the slot bottom of the winding slot; the plurality of winding wires are parallel to each other, and the winding wires are arranged obliquely relative to the width direction of the winding slot.

7. The motor according to any one of claims 1 to 4, characterized in that: One end of the flat wire winding away from the slot opening and the bottom of the winding slot are surrounded to form a second oil cooling channel, and the second oil cooling channel runs through both ends of the axis of the stator core.

8. The motor according to any one of claims 1 to 4, characterized in that: It also includes insulating paper, which is attached to the winding groove and covers the groove wall of the winding groove.

9. An electric drive system, characterized in that: A motor comprising any one of claims 1-8.

10. A vehicle, characterized in that: Includes the electric drive system as described in claim 9.

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