An electric motor drive system and a vehicle

Abstract

The present invention provides a motor drive system and an automobile, relating to the technical field of new energy automobiles. The motor drive system includes: a motor controller system, a motor system, and a reduction gearbox; the motor controller system includes a controller; the motor system includes a motor, and an oil injection structure is installed on the motor; the reduction gearbox is respectively connected to the motor controller system and the motor system; wherein, the oil injection structure has at least oil injection ports arranged in three different directions, a first oil groove is arranged on the motor housing, the first oil groove is close to the end face of the stator core, the opening direction of the first oil groove is parallel to the first direction, and part of the oil injection ports face the first oil groove so that the coolant is sprayed into the first oil groove, and the first direction is the axial direction of the motor. Through the design of the oil injection port direction of the oil injection structure and the design of the first oil groove on the motor housing, the motor can be effectively cooled from multiple angles, and the heat dissipation efficiency of the motor can be accelerated.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and particularly relates to a motor drive system and a vehicle. Background Art

[0002] With the rapid development of new energy vehicle technology, people have higher and higher requirements for the noise of the drive motor of new energy vehicles. At the same time, with the increase of the motor power density, the requirements for the heat dissipation capacity of the motor have also been greatly improved. At present, the main heat dissipation method is still water cooling. Because it cannot directly cool the heat source, the heat of the motor winding end needs to be transferred to the inner wall of the motor housing through the stator core, and the heat is taken away through the waterway of the motor housing. The transfer path is long and the heat dissipation efficiency is low. Spraying is used to dissipate heat from the motor winding, which cannot meet the cooling requirements of the motor stator core and the rotor. Immersion is used to dissipate heat from the motor, but there is a situation of rotor oil stirring loss. Therefore, the current heat dissipation methods cannot meet the requirements of rapid heat dissipation of the motor. Summary of the Invention

[0003] The present invention provides a motor drive system and a vehicle to solve the technical problem of low heat dissipation efficiency of the motor in the motor drive system.

[0004] An embodiment of the present invention provides a motor drive system. The motor drive system includes a motor controller system, a motor system, and a reduction gearbox. The motor controller system includes a controller. The motor system includes a motor, and an oil injection structure is installed on the motor. The reduction gearbox is respectively connected to the motor controller system and the motor system. Among them, the oil injection structure has at least oil injection ports arranged in three different directions. The motor housing is provided with a first oil groove, the first oil groove is close to the end face of the stator core, the opening direction of the first oil groove is parallel to the first direction, and part of the oil injection ports face the first oil groove so that the coolant is sprayed into the first oil groove. The first direction is the axial direction of the motor.

[0005] Further, the number of the first oil grooves is multiple, and the multiple first oil grooves are arranged on the motor housing along the circumferential direction, and the first oil grooves communicate with each other.

[0006] Further, an opening is provided on one side of the first oil groove close to the stator core, and the first oil groove communicates with the wire grooves of the stator core through the opening so that part of the coolant flows into the wire grooves.

[0007] Further, the oil injection structure includes an oil inlet device and an oil injection ring. The oil inlet device is respectively connected to two oil injection rings. The two oil injection rings are respectively located at both ends of the motor housing. The oil injection ports are located on the oil injection rings, and the oil injection rings are fixed on the motor housing.

[0008] Further, the fuel injection ring has two inlets, and annular bosses are arranged at the inlet positions of the fuel injection ring, and the annular bosses are cooperatively connected with the motor housing.

[0009] Further, a second oil groove is also arranged on the motor housing, the opening direction of the second oil groove is perpendicular to the opening direction of the first oil groove, and part of the fuel injection ports face the second oil groove so that the coolant is sprayed into the second oil groove. When the motor housing and the motor stator are assembled, the second oil grooves communicate to form a first oil path.

[0010] Further, the motor rear end cover has a second oil path, and the motor system further includes a connecting pipe. The connecting pipe includes a first connecting pipe and a second connecting pipe. The first connecting pipe connects the first oil path and the second oil path, and the second connecting pipe connects the second oil path and the rotor shaft of the motor rotor.

[0011] Further, the rotor shaft has fuel injection holes, and key grooves are arranged on the rotor shaft. The fuel injection holes communicate with the key grooves, and the coolant inside the rotor shaft can flow into the key grooves through the fuel injection holes.

[0012] Further, the motor further includes an oil slinger. The oil slinger is installed at intervals between the rotor iron cores, and the oil slinger is provided with oil guiding grooves, and the oil guiding grooves communicate with the key grooves.

[0013] Further, the motor system includes two such motors, and the two motors are respectively fixed on both sides of the reduction gearbox. The motors and the reduction gearbox share an end cover; the motor controller system includes two controllers and a shunt box. The two controllers are respectively located on both sides of the shunt box and are connected to the shunt box, and the motor system is electrically connected to the motor controller system.

[0014] Further, the shunt box includes a power box housing, a connector and a DC component. The connector and the DC component are located in the accommodating cavity of the power box housing; a groove structure is arranged at the input end of the copper row in the DC component, the input end is matched with the connector, and a first fixing hole for the copper row is arranged at the output end of the copper row, and the output end is connected to an electrical device.

[0015] Further, the copper row includes a positive copper row and a negative copper row. The positive copper row and the negative copper row are adjacent to each other and pass through a common magnetic ring together, and an insulating paper is coated on the negative copper row.

[0016] Further, a copper row seat is also installed in the accommodating cavity of the power box housing. The copper row seat is provided with a copper row card slot, a capacitor chamber and a magnetic ring chamber. The copper row card slot is used to isolate the positive copper row and the negative copper row, and the copper row card slot, the capacitor chamber and the magnetic ring chamber are integrally potted.

[0017] Further, two DC components are arranged in the accommodation cavity of the power supply box housing. The DC components are symmetrically designed with respect to the vertical plane where the geometric center point in the accommodation cavity is located. The vertical plane is parallel to the extending direction of the power supply box housing. A heat-conducting pad is arranged between the DC components and the power supply box housing.

[0018] Further, the power supply box housing has two DC interfaces. The installation points of the power supply box housing and the DC interfaces are symmetrically designed with respect to the vertical plane respectively. The controller is hermetically connected to the power supply box housing.

[0019] Further, the shunt box further includes an upper cover. The upper cover cooperates with the power supply box housing to close the accommodation cavity of the power supply box housing. The upper cover has a breathing valve communicating with the outside.

[0020] An embodiment of the present invention further provides an automobile, which includes: the above-mentioned motor drive system, a transmission mechanism, and wheels; the motor drive system provides power, and the transmission mechanism connects the wheels and the motor drive system to drive the wheels to rotate.

[0021] The present invention provides a motor drive system and an automobile. The motor drive system includes: a motor controller system, a motor system, and a reduction gearbox; the motor controller system includes a controller; the motor system includes a motor, and an oil injection structure is installed on the motor; the reduction gearbox is respectively connected to the motor controller system and the motor system; wherein, the oil injection structure has at least oil injection ports arranged in three different directions. A first oil groove is arranged on the motor housing, and the first oil groove is close to the end face of the stator core. The opening direction of the first oil groove is parallel to the first direction. Some of the oil injection ports face the first oil groove so that the coolant is sprayed into the first oil groove. The first direction is the axial direction of the motor. Through the design of the oil injection structure, oil injection ports in multiple directions are set to realize multi-angle cooling and lubrication of the motor stator. At the same time, a first oil groove is arranged on the motor housing, and the first oil groove can store part of the coolant, thereby increasing the heat exchange time between the coolant and the motor stator, avoiding the rapid fall of the coolant under the action of gravity and being unable to achieve sufficient heat exchange with the motor stator. Further, the opening direction of the first oil groove is parallel to the first direction, and some of the oil injection ports face the first oil groove, so that the coolant in the first oil groove can effectively cool the two end faces of the axial direction of the motor stator, increasing the heat dissipation area of the motor stator, and further accelerating the heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of a motor drive system provided by an embodiment of the present invention;

[0023] Figure 2 is a schematic structural diagram of a motor housing provided by an embodiment of the present invention;

[0024] Figure 3 Schematic diagram of the structure of an oil injection ring provided by an embodiment of the present invention;

[0025] Figure 4 Cross-sectional view of a motor housing provided by an embodiment of the present invention;

[0026] Figure 5 Schematic diagram of the structure of the motor housing from another perspective provided by an embodiment of the present invention;

[0027] Figure 6 Schematic diagram of the coolant flow inside the motor housing provided by an embodiment of the present invention;

[0028] Figure 7 Schematic diagram of the structure of a connecting pipe provided by an embodiment of the present invention;

[0029] Figure 8 Schematic diagram of the structure of a rotor shaft provided by an embodiment of the present invention;

[0030] Figure 9 Schematic diagram of the structure of an oil slinger provided by an embodiment of the present invention;

[0031] Figure 10 Schematic diagram of the structure of the motor housing from another perspective provided by an embodiment of the present invention;

[0032] Figure 11 Schematic diagram of the structure of another perspective of the motor drive system provided by an embodiment of the present invention;

[0033] Figure 12 Schematic diagram of the structure of another perspective of the motor drive system provided by an embodiment of the present invention;

[0034] Figure 13 Schematic diagram of the structure of another perspective of the motor drive system provided by an embodiment of the present invention;

[0035] Figure 14 Schematic diagram of the structure of another perspective of the motor drive system provided by an embodiment of the present invention;

[0036] Figure 15 Schematic diagram of the structure of another perspective of the motor drive system provided by an embodiment of the present invention;

[0037] Figure 16 Schematic diagram of the structure of a motor controller system provided by an embodiment of the present invention;

[0038] Figure 17 Schematic diagram of the structure of another perspective of the motor controller system provided by an embodiment of the present invention;

[0039] Figure 18Schematic diagram of the structure of a shunt box provided by an embodiment of the present invention;

[0040] Figure 19 Schematic diagram of the structure of a positive copper busbar provided by an embodiment of the present invention;

[0041] Figure 20 Schematic diagram of the structure of a negative copper busbar provided by an embodiment of the present invention;

[0042] Figure 21 Schematic diagram of the structure of a copper busbar combination provided by an embodiment of the present invention;

[0043] Figure 22 Schematic diagram of the structure of the cooperation between the copper busbar combination and the copper busbar seat provided by an embodiment of the present invention;

[0044] Figure 23 Schematic diagram of the structure of a copper busbar seat provided by an embodiment of the present invention;

[0045] Figure 24 Schematic diagram of the structure of another perspective of the copper busbar seat provided by an embodiment of the present invention;

[0046] Figure 25 Schematic diagram of the structure of the cooperation between an adapter copper busbar and a capacitor provided by an embodiment of the present invention;

[0047] Figure 26 Schematic diagram of the structure of an adapter copper busbar provided by an embodiment of the present invention;

[0048] Figure 27 Schematic diagram of the structure of the cooperation of a DC component provided by an embodiment of the present invention;

[0049] Figure 28 Schematic diagram of the structure of the cooperation of a DC component provided by an embodiment of the present invention;

[0050] Figure 29 Schematic diagram of the structure of a power supply box housing provided by an embodiment of the present invention;

[0051] Figure 30 Schematic diagram of the structure of the power supply box housing with an upper cover provided by an embodiment of the present invention.

[0052] Explanation of reference numerals

[0053] 10. Motor drive system; 100. Motor system; 110. Motor; 110A. First motor; 110B. Second motor; 111. Motor housing; 1111. First oil sump; 1112. Second oil sump; 1113. First oil passage; 1114. Oil sump box; 112. Motor stator; 1121. Stator core; 113. Motor rear end cover; 1131. Second oil passage; 114. Rotor shaft; 1141. Oil injection hole; 1142. Keyway; 1143. Rotor iron core sheet; 115. Connecting pipe; 1151. First connecting pipe; 1152. Second connecting pipe; 1153. Third connecting pipe; 116. Oil slinger; 1161. Oil guiding groove; 120. Oil injection structure; 121. Oil injection port; 1211. First oil injection port; 1212. Second oil injection port; 1213. Third oil injection port; 122. Oil inlet device; 123. Oil injection ring; 123A. First oil injection ring; 123B. Second oil injection ring; 1231. Oil injection ring fixing point; 1232. Annular boss; 200. Motor controller system; 210. Controller; 210A. First controller; 210B. Second controller; 220. Shunt box; 221. Power box housing; 2211. Accommodation cavity; 222. Connector; 223. DC component; 2231. Copper busbar; 2231A. Positive copper busbar; 2231B. Negative copper busbar; 22311. Groove structure; 22312. First special boss; 22313. Second special boss; 22314. First copper busbar fixing hole; 2232. Insulating paper; 2233. Magnetic ring; 2234. Copper busbar seat; 22341. Copper busbar card slot; 22342. Capacitor bin; 22343. Magnetic ring bin; 22344. First mounting hole; 22345. Second fixing hole; 22346. Fixing structure; 22347. Card slot structure; 2235. Adapter copper sheet; 22351. Boss round hole; 22352. Flanging structure; 22353. Conical structure; 2236. Capacitor; 22361. Pin; 224. Upper cover; 2241. Breather valve; 230. Three-phase copper busbar; 300. Reduction gearbox; 400. Radiator; 410. First radiator; 420. Second radiator; 500. Oil pipe; 510. First oil pipe; 520. Second oil pipe; 600. Oil pump. Detailed implementation manner

[0054] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0055] Each specific technical feature described in the specific embodiments can be combined in any suitable manner without contradiction. For example, different embodiments and technical solutions can be formed by combining different specific technical features. To avoid unnecessary repetition, various possible combination methods of each specific technical feature in the present invention will not be described separately.

[0056] In the following description, the terms "first / second / ..." only distinguish different objects and do not indicate that there are the same or related relationships between the objects. It should be understood that the orientation descriptions "above", "below", "outside", and "inside" are all in the orientation in the normal use state, and the "left" and "right" directions represent the left and right directions shown in the specific corresponding schematic diagram, which can be the left and right directions in the normal use state or not.

[0057] It should be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device including such element. The term "connection" includes both direct connection and indirect connection without special explanation.

[0058] In the specific implementation manner, the motor drive system is applicable to any type of motor drive system. Exemplarily, the motor drive system can be applicable to a single-motor drive system; Exemplarily, the motor drive system can be applicable to a dual-motor drive system. For the sake of convenience of description, the following will take the motor drive system applicable to a dual-motor drive system as an example for key introduction and description.

[0059] In some embodiments, as Figure 1 shown, the motor drive system 10 includes a motor system 100, a motor controller system 200, and a reduction gearbox 300. The motor system 100 includes a motor 110, an oil injection structure 120 is installed on the motor 110, and the reduction gearbox 300 is respectively connected to the motor controller system 200 and the motor system 100.

[0060] Specifically, first, the motor drive system 10 is a device that converts the energy of the power battery into kinetic energy to provide power for new energy vehicles. The motor drive system 10 can be a single-motor drive system or a dual-motor drive system, which will not be specifically elaborated here, and specific embodiments will be given later. Whether it is a single-motor drive system or a dual-motor drive system, it includes a motor system 100 and a motor controller system 200, and the motor system 100 and the motor controller system 200 are respectively connected to the reduction gearbox 300. The motor system 100 includes a motor 110 and a cooling system. The motor 110 includes a motor housing 111, a motor stator 112 and a motor rotor. The motor stator 112 includes a stator core 1121 and a stator winding, etc. The cooling system includes a cooling oil circuit, an oil injection structure 120 and a radiator 400 and other related devices and structures. The coolant that is cooled by the radiator 400 sprays the coolant on the stator core 1121 and the stator winding through the oil injection structure 120, thereby dissipating heat from the motor 110. The coolant can be any liquid with a cooling effect, for example, cooling water or cooling oil. The motor controller system 200 includes a controller 210, which is a device that controls the energy transfer between the power supply and the motor 110. The controller 210 includes a control signal interface circuit, a driving motor control circuit and a driving circuit.

[0061] As Figures 2 to 5 shown, among them, the oil injection structure 120 has at least oil injection ports 121 arranged in three different directions. The motor housing 111 is provided with a first oil groove 1111, the first oil groove 1111 is close to the end face of the stator core 1121, the opening direction of the first oil groove 1111 is parallel to the first direction, and some of the oil injection ports 121 face the first oil groove 1111 so that the coolant is sprayed into the first oil groove 1111. The first direction is the axial direction of the motor 110.

[0062] Specifically, a large amount of heat is generated when the motor 110 is in operation. Especially for high-speed motors, the rotational speed can reach 25,000 to 35,000 revolutions per minute, and the speed of generating heat will be faster. Therefore, it is necessary to accelerate the heat dissipation efficiency of the motor 110 to avoid the high temperature affecting the performance of the motor 110. Therefore, this application considers cooling and dissipating heat from the stator core 1121 of the motor 110 more comprehensively from multiple angles. The oil injection structure 120 has at least oil injection ports 121 arranged in three different directions. It can be understood that there are at least three directions for the opening directions of the oil injection ports 121. Exemplarily, for the convenience of explanation, a coordinate system is established for auxiliary explanation. The first direction is the X-axis direction, that is, the axial direction of the motor 110, the vertical direction is the Z-axis direction, and the direction perpendicular to the X-axis and the Z-axis is the Y-axis direction. The oil injection ports 121 are divided into a first oil injection port 1211, a second oil injection port 1212, and a third oil injection port 1213. It should be emphasized that the first oil injection port 1211 does not refer to an oil injection port with only one quantity, but a type of oil injection port with the same opening direction. The quantity of the first oil injection port 1211 can be multiple, and the quantities of the second oil injection port 1212 and the third oil injection port 1213 can also be multiple. The oil injection structure 120 can be a bent ring structure, such as an oil injection ring 123. The oil injection ring 123 includes a straight pipe and an annular pipe. The first oil injection port 1211 is located on the annular pipe, and the opening direction faces the first direction, that is, the X-axis direction. At the same time, the motor housing 111 is provided with a first oil groove 1111. The first oil groove 1111 extends along the axial direction. The size of the first oil groove 1111 is not limited here and can be determined according to actual needs. The opening direction of the first oil groove 1111 is the same as the first direction, so that the coolant ejected from the first oil injection port 1211 directly enters the first oil groove 1111. At the same time, the first oil groove 1111 is close to the end face of the stator core 1121, and the coolant in the first oil groove 1111 can fully exchange heat with the stator core 1121, increasing the time for heat exchange between the coolant and the stator core 1121, and avoiding the rapid fall of the coolant under the action of gravity and being unable to achieve sufficient heat exchange with the stator core 1121. The second oil injection port 1212 is located on the straight pipe, and the opening direction is parallel to the Z-axis direction. The coolant ejected through the second oil injection port 1212 can directly cool the side surface of the stator core 1121 in the axial direction. The third oil injection port 1213 is also located on the annular pipe. The opening direction of the third oil injection port 1213 can be parallel to the Y-axis direction or parallel to the plane formed by the Y-axis and the Z-axis, so that the opening direction of the third oil injection port 1213 faces the geometric center of the annular pipe, for radially injecting oil to cool the end of the stator winding of the motor stator 112. Thus, the cooling of the stator core 1121 and the stator winding is realized as a whole, and the problem that the traditional oil cooling method cannot cool the stator core 1121 is solved.

[0063] The present invention provides a motor drive system and an automobile. The motor drive system includes: a motor controller system, a motor system, and a reduction gearbox; the motor controller system includes a controller; the motor system includes a motor, and an oil injection structure is installed on the motor; the reduction gearbox is respectively connected to the motor controller system and the motor system; wherein, the oil injection structure has at least oil injection ports arranged in three different directions, a first oil groove is arranged on the motor housing, the first oil groove is close to the end face of the stator core, the opening direction of the first oil groove is parallel to the first direction, and some of the oil injection ports face the first oil groove so that the coolant is sprayed into the first oil groove, and the first direction is the axial direction of the motor. Through the design of the oil injection structure, oil injection ports in multiple directions are set to realize multi-angle cooling and lubrication of the motor stator. At the same time, a first oil groove is arranged on the motor housing, and the first oil groove can store part of the coolant, thereby increasing the heat exchange time between the coolant and the motor stator, avoiding the rapid fall of the coolant under the action of gravity and unable to realize sufficient heat exchange with the motor stator. Further, the opening direction of the first oil groove is parallel to the first direction, and some of the oil injection ports face the first oil groove, so that the coolant in the first oil groove can effectively cool the two end faces of the axial direction of the motor stator, increasing the heat dissipation area of the motor stator, and further accelerating the heat dissipation efficiency.

[0064] In some embodiments, as Figure 5 shown, the number of the first oil grooves 1111 is multiple, and the multiple first oil grooves 1111 are arranged on the motor housing 111 in the circumferential direction, and the first oil grooves 1111 communicate with each other. Specifically, considering the uniformity of heat dissipation, a plurality of first oil grooves 1111 are circumferentially spaced on the axial end face of the motor housing 111, and the specific number is not limited and can be determined according to actual needs. In order to increase the fluidity of the coolant, the first oil grooves 1111 can communicate with each other, so that the coolant sprayed out through the first oil injection port 1211 can flow into the first oil groove 1111 and circulate, thereby improving the cooling efficiency of the end face of the stator core 1121. At the same time, in order to further improve the circulation of the coolant, exemplarily, an opening is arranged on one side of the first oil groove 1111 close to the stator core 1121. When the motor 110 is placed horizontally, the opening can be arranged at a position above the first oil groove 1111. It can be understood that after the coolant sprayed out from the first oil injection port 1211 flows into the first oil groove 1111, the coolant can gather in the first oil groove 1111 and will not immediately flow out through the opening. By using the time when the coolant stays and gathers in the first oil groove 1111, sufficient heat dissipation with the end face of the stator core 1121 can be realized. When the coolant capacity exceeds the height of the opening, the coolant flows into the wire grooves of the stator core 1121 through the opening, and can also cool the stator windings in the wire grooves, and can also drive the circulation of the coolant, increasing the heat dissipation contact area.

[0065] In some embodiments, as Figure 2 and Figure 3As shown, the fuel injection structure 120 includes an oil inlet device 122 and fuel injection rings 123. The oil inlet device 122 is respectively connected to two fuel injection rings 123. The two fuel injection rings 123 are respectively located at both ends of the motor housing 111. The fuel injection ports 121 are located on the fuel injection rings 123, and the fuel injection rings 123 are fixed to the motor housing 111. Specifically, considering the cooling of the stator windings at both ends of the motor stator 112 and the heat dissipation at both ends of the stator core 1121, two fuel injection rings 123 can be provided. For the convenience of description, the two fuel injection rings 123 are respectively the first fuel injection ring 123A and the second fuel injection ring 123B. Each fuel injection ring 123 can be formed into a loop structure by bending a pipe. The first fuel injection ring 123A and the second fuel injection ring 123B are respectively located at both ends of the motor housing 111 and are fixed to the motor housing 111 through fuel injection ring fixing points 1231, thereby ensuring the stability of the assembly of the fuel injection rings 123. The fuel injection ring 123 includes a straight pipe and an annular pipe. The first fuel injection port 1211 and the third fuel injection port 1213 are located on the annular pipe, and the second fuel injection port 1212 is located on the straight pipe. The fuel injection structure 120 further includes an oil inlet device 122. The coolant enters the oil inlet device 122 after passing through the radiator 400 and flows into the first fuel injection ring 123A and the second fuel injection ring 123B respectively through the structure inside the motor housing 111. Subsequently, the coolant is ejected through the first fuel injection port 1211, the second fuel injection port 1212, and the third fuel injection port 1213 to cool and dissipate heat from the stator windings and the stator core 1121.

[0066] In some embodiments, as Figure 2 and Figure 3 shown, the fuel injection ring 123 has two inlets. An annular boss 1232 is provided at the inlet position of the fuel injection ring 123, and the annular boss 1232 is cooperatively connected with the motor housing 111. Specifically, in order to increase the fuel injection pressure and improve the spraying uniformity of each fuel injection port 121 at the same time, each fuel injection ring 123 has two inlets, that is, both ends of each fuel injection ring 123 are inlets, and both ends of each fuel injection ring 123 are cooperatively connected with the motor housing 111. The coolant enters the oil inlet device 122 after passing through the radiator 400 and flows into the first fuel injection ring 123A and the second fuel injection ring 123B through four inlets through the structure inside the motor housing 111. At the same time, considering the problem that the connection position between the fuel injection ring 123 and the motor housing 111 may fall off due to excessive coolant pressure in the fuel injection ring 123, an annular boss 1232 is provided at the inlet position of each fuel injection ring 123. By installing a sealing ring on the annular boss 1232 and cooperating with the motor housing 111, the oil circuit is sealed to ensure the pressure inside the fuel injection ring 123 and make the spraying of each fuel injection port 121 on the fuel injection ring 123 uniform.

[0067] In some embodiments, as Figure 4As shown, considering the cooling and heat dissipation of the axial side of the stator core 1121, the motor housing 111 is further provided with a second oil groove 1112. The opening direction of the second oil groove 1112 is perpendicular to the opening direction of the first oil groove 1111. The second oil injection port 1212 in the oil injection port 121 faces the second oil groove 1112, and the coolant sprayed out from the second oil injection port 1212 is sprayed into the second oil groove 1112. When the motor housing 111 and the motor stator 112 are assembled, the second oil groove 1112 communicates to form a first oil passage 1113.

[0068] In some embodiments, as Figure 6 and Figure 7 shown, the motor rear end cover 113 has a second oil passage 1131. The motor system 100 further includes a connecting pipe 115. The connecting pipe 115 includes a first connecting pipe 1151 and a second connecting pipe 1152. The first connecting pipe 1151 connects the first oil passage 1113 and the second oil passage 1131, and the second connecting pipe 1152 connects the second oil passage 1131 and the rotor shaft 114 of the motor rotor. Specifically, in order to enhance the fluidity of the coolant in the motor housing 111, the motor housing 111 has a first oil passage 1113, and other oil passages can also be added, which is not specifically limited. The motor 110 includes a motor rear end cover 113, and the motor rear end cover 113 has a second oil passage 1131. For the connectivity of the oil passage in the motor housing 111 and the oil passage in the motor rear end cover 113, the motor system 100 further includes a connecting pipe 115. The first connecting pipe 1151 is used to connect the first oil passage 1113 or other oil passages in the motor housing 111, so that the coolant in the oil passage of the motor housing 111 can flow into the second oil passage 1131 of the motor rear end cover 113. In order to realize the circulation of the entire coolant, the rotor shaft 114 of the motor rotor is a hollow shaft. The second connecting pipe 1152 is used to connect the second oil passage 1131 of the motor rear end cover 113 and the rotor shaft 114 of the motor rotor, so that the coolant in the second oil passage 1131 of the motor rear end cover 113 can flow into the rotor shaft 114 of the motor rotor. In order to realize the connection of the oil passage in the motor housing 111 and the oil passage in the reduction gearbox 300, the connecting pipe 115 includes a third connecting pipe 1153. The third connecting pipe 1153 is used to connect the oil passages of the motor housing 111 and the reduction gearbox 300, so that the cooling oil is conducted to the reduction gearbox 300 to realize the lubrication and cooling in the reduction gearbox 300. Through the design of the connecting pipe 115, the flow cooling from the motor housing 111 to the motor rear end cover 113 and then to the rotor shaft 114 can be realized.

[0069] In some embodiments, in combination with Figure 6 and Figure 8As shown, the rotor shaft 114 has an oil injection hole 1141, and a keyway 1142 is provided on the rotor shaft 114. The oil injection hole 1141 communicates with the keyway 1142, and the coolant inside the rotor shaft 114 can flow into the keyway 1142 through the oil injection hole 1141. Specifically, in order to realize the circulating cooling of the coolant, the coolant flowing into from the oil circuit of the motor rear end cover 113 is discharged. The rotor shaft 114 of the motor rotor is a hollow shaft, the rotor shaft 114 has an oil injection hole 1141, and a keyway 1142 is provided on the rotor shaft 114. The keyway 1142 extends along the axial direction of the rotor shaft 114. After the keyway 1142 is installed and matched with the rotor core, a groove is formed. During the rotational movement of the motor 110, after the coolant is ejected through the oil injection hole 1141, it flows through the oil guiding groove formed by the keyway 1142 to realize the axial movement of the coolant oil in the motor 110. The specific size and number of the oil injection holes 1141 are not limited. The number of the oil injection holes 1141 can be 1, or multiple can be arranged at intervals. Similarly, the size and number of the keyways 1142 are not limited either. For example, four keyways 1142 are evenly arranged along the axial direction of the rotor shaft 114, and the number of the oil injection holes 1141 is also four. Each oil injection hole 1141 communicates with a keyway 1142, so that the coolant inside the rotor shaft 114 can flow into the keyway 1142 through the oil injection hole 1141. Thus, the cooling of the inside and the outer surface of the rotor shaft 114 is realized.

[0070] In some embodiments, in combination with Figure 6 and Figure 9 shown, the motor 110 further includes an oil slinger 116. The oil slinger 116 is installed at intervals between the rotor iron core sheets 1143. The oil slinger 116 is provided with an oil guiding groove 1161, and the oil guiding groove 1161 communicates with the keyway 1142. Specifically, in order to better cool the rotor shaft 114, the rotor iron core sheets 1143 and the permanent magnets simultaneously, and thus improve the problem of the increase in the rotor temperature, the motor 110 further includes an oil slinger 116. The specific number and installation position of the oil slinger 116 are not limited. For example, the number of the oil slingers 116 is 3, which are respectively installed at both ends of the rotor core and the middle position of the rotor iron core sheets 1143. The oil slinger 116 is provided with an oil guiding groove 1161. The oil slinger 116 is a circular sheet-like structure. The oil guiding groove 1161 extends along the radial direction, and the oil guiding groove 1161 communicates with the keyway 1142. For example, four keyways 1142 are evenly arranged along the axial direction of the rotor shaft 114, and four oil guiding grooves 1161 are also evenly arranged along the circumferential direction of the oil slinger 116. Each keyway 1142 communicates with an oil guiding groove 1161. By using the oil guiding groove 1161 to eject the coolant in the keyway 1142, the contact area between the coolant and the relevant components of the motor 110 is increased, the fluidity of the coolant is enhanced, and the heat dissipation efficiency is improved.

[0071] In some embodiments, as Figure 10As shown in the figure, an oil sump 1114 is designed at the bottom of the motor housing 111. The oil sump 1114 is used to receive the coolant inside the motor 110. At the same time, a profiling structure is designed on the side end cover of the reduction gearbox 300. Through sealed installation, the coolant in the oil sump 1114 can enter the reduction gearbox 300 through a channel. At the same time, a filter is provided in the oil sump 1114 of the reduction gearbox 300 to filter and recycle the coolant after circulation. The entire oil circuit is pumped out by a oil pump 600 designed in the oil sump 1114, along the oil circuit designed in the reduction gearbox 300, enters the radiator 400 for cooling, and then enters the total motor inlet to achieve a circulating operation.

[0072] In some embodiments, as Figures 11 to 15 shown, the motor system 100 includes two motors 110, and the two motors 110 are respectively fixed on both sides of the reduction gearbox 300. The motors 110 share an end cover with the reduction gearbox 300; the motor controller system 200 includes two controllers 210 and a shunt box 220. The two controllers 210 are respectively located on both sides of the shunt box 220 and are connected to the shunt box 220. The motor system 100 is electrically connected to the motor controller system 200.

[0073] Specifically, in order to reduce the system volume and improve the system power, the present application designs a dual-motor drive system. This dual-motor drive system is highly integrated. A higher-power electric drive system integrates a coaxial dual-motor and a reduction gearbox, doubling the output power. The motor drive system 10 includes a motor system 100, a motor controller system 200, a reduction gearbox 300, a radiator 400, and an oil pipe 500. The motor system 100 includes two motors 110, which are the first motor 110A and the second motor 110B respectively. The first motor 110A and the second motor 110B are respectively fixed on both sides of the reduction gearbox 300. For example, both motors 110 are fixed to the end face of the reduction gearbox 300 through long screws. One end of the motor shaft is fixed to the end cover of the reduction gearbox 300 by a bearing, realizing the sharing of the end cover between the motor 110 and the reduction gearbox 300. Compared with the traditional dual-motor system, two motor end covers can be reduced, making the axial dimension more compact. For example, the volume is reduced by 10% year-on-year. The radiator 400 includes a first radiator 410 and a second radiator 420. Both the first radiator 410 and the second radiator 420 are fixed on the reduction gearbox 300. At the same time, the oil inlets of the first radiator 410 and the second radiator 420 are directly docked with the oil ports of the reduction gearbox 300. The oil pipe 500 includes a first oil pipe 510 and a second oil pipe 520. The oil outlets of the first radiator 410 and the second radiator 420 are respectively docked with the oil inlets of the first motor 110A and the second motor 110B through the first oil pipe 510 and the second oil pipe 520. The two radiators 400 are connected to the vehicle cooling circuit, and the entire oil circuit shares an oil sump, which is designed at the bottom of the reduction gearbox 300. Exemplarily, two oil pumps 600 are designed at the bottom of the reduction gearbox 300. The coolant of one oil pump 600 enters the first motor 110A and the reduction gearbox 300 through the first radiator 410, and the coolant of the other oil pump 600 enters the second motor 110B through the second radiator 420. Compared with the split cooling system, the post-integrated cooling system of the present application has a more compact structure and more streamlined external pipelines, effectively reducing the use of components. At the same time, this structure can realize the use of a single oil-cooled motor by canceling the second motor 110B and its accessories.

[0074] Such as Figure 16 And Figure 17As shown, the motor controller system 200 includes two controllers 210 and a shunt box 220. The two controllers 210 are the first controller 210A and the second controller 210B respectively. The first controller 210A and the second controller 210B are located on both sides of the shunt box 220 and are connected to the shunt box 220. Inside the controller 210, the drive and control modules are normally installed, and the DC terminal is connected to the shunt box 220. The AC three-phase terminal is connected to the motor 110. The motor controller system 200 is connected to the motor system 100 through a three-phase copper bar 230 and is installed in the outlet box of the motor 110. The motor controller system 200 is fixed on the motor system 100 by a number of bolts, and the entire motor controller system 200 is connected to the motor system 100 to achieve high-voltage and low-voltage connection and control.

[0075] In some embodiments, therefore, the motor drive system 10 of the present application cools the motor stator core 1121, the winding ends, the rotor shaft 114, the rotor core, and the permanent magnets relatively sufficiently, improving the temperature rise of the motor 110. The two motors 110 and the reduction gearbox 300 are respectively installed by bolt connection, and the same set of coolant meets the cooling requirements of the two motors 110, completing the oil cooling of the dual-motor drive system, with a compact structure.

[0076] In some embodiments, such as Figures 18 to 20As shown, the shunt box 220 includes a power box housing 221, a connector 222, and a DC component 223. The power box housing 221 is designed separately to facilitate power maintenance. The connector 222 and the DC component 223 are located in the accommodation cavity 2211 of the power box housing 221. A groove structure 22311 is provided at the input end of the busbar 2231 in the DC component 223. The input end is matched with the connector 222. A first fixing hole 22314 of the busbar is provided at the output end of the busbar 2231, and the output end is connected to the electrical equipment. Specifically, the shunt box 220 introduces direct current, filters it, and then supplies it to the electrical equipment, and can be designed in one-way, two-way, and multi-way. The filtering here is a CLC filtering structure, which is composed of a capacitor C, an inductor L, and a resistor R, and can suppress and absorb power noise. The specific level is not limited. For example, it passes the class 4 level. Through the design of the filtering component, the power waveform is improved, and then the EMC (Electromagnetic Compatibility) effect of the entire electric drive is improved. Both the connector 222 and the DC component 223 are installed in the accommodation cavity 2211 of the power box housing 221. The DC component 223 includes a busbar 2231. The busbar 2231 includes a positive busbar 2231A and a negative busbar 2231B. In order to position with the connector 222 and prevent the connector 222 from loosening and withdrawing, and ensure reliable contact during use, a groove structure 22311 is designed at the input end where the positive busbar 2231A and the negative busbar 2231B are both connected to the connector 222. The busbar 2231 is stably connected to the connector 222 by using the groove structure 22311. At the same time, a first fixing hole 22314 of the busbar is provided at the other output end of the positive busbar 2231A and the negative busbar 2231B, and the connection with the electrical equipment is made by using the first fixing hole 22314 of the busbar. First special bosses 22312 and second special bosses 22313 are also designed on the positive busbar 2231A and the negative busbar 2231B. The first special bosses 22312 and the second special bosses 22313 are used for the positioning, connection, and welding of the capacitor leads.

[0077] In some embodiments, as Figure 21 shown, in order to absorb and suppress differential-mode and common-mode noise, the positive busbar 2231A and the negative busbar 2231B are placed adjacent to each other in a stacked manner, and an insulating paper 2232 is wrapped around the negative busbar 2231B, so that the ESL (Equivalent Series Inductance) can be effectively reduced. The positive busbar 2231A and the negative busbar 2231B jointly pass through a magnetic ring 2233. The magnetic ring 2233 and the busbar 2231 form an inductor to filter the common-mode signal and form a multi-stage filtering structure with the front-end and back-end capacitors 2236, so as to absorb and suppress differential-mode and common-mode noise.

[0078] In some embodiments, as Figures 22 to 24As shown, a copper busbar seat 2234 is also installed in the accommodating cavity 2211 of the power box shell 221. The copper busbar seat 2234 is provided with a copper busbar slot 22341, a capacitor compartment 22342 and a magnetic ring compartment 22343. The copper busbar slot 22341 is used to isolate the positive copper busbar 2231A from the negative copper busbar 2231B. The copper busbar slot 22341, the capacitor compartment 22342 and the magnetic ring compartment 22343 are integrally potted. Specifically, in order to ensure the overall connection stability of the internal components of the shunt box 220, a copper bar seat 2234 is provided in the accommodating cavity 2211. In order to facilitate the installation of the copper bar 2231 and the magnetic ring 2233 on the copper bar seat 2234, the copper bar seat 2234 is provided with a copper bar slot 22341, a capacitor compartment 22342 and a magnetic ring compartment 22343. The copper bar slot 22341 is used to isolate the positive copper bar 2231A from the negative copper bar 2231B, and to position the positive copper bar 2231A and the negative copper bar 2231B, and can also be used for potting and curing the copper bar 2231. The copper bar seat 2234 is provided with a capacitor compartment 22342. For example, each copper bar seat 2234 is designed with 5 capacitor compartments 22342. The capacitor compartment 22342 is used to place the capacitor 2236, and can also be used for potting and curing the capacitor 2236. The capacitor 2236 includes an X capacitor and a Y capacitor. The copper bar seat 2234 is provided with a magnetic ring compartment 22343, which is used to place the magnetic ring 2233 and can also be used for potting and curing the magnetic ring 2233. By potting the copper bar slot 22341, the capacitor compartment 22342 and the magnetic ring compartment 22343, the capacitor 2236, the magnetic ring 2233 and the copper bar seat magnetic ring 2233 are kept in an integrated structure to ensure the reliability of use; the copper bar seat 2234 is also provided with a first mounting hole 22344 that matches the first copper bar fixing hole 22314, and the positive copper bar 2231A and the negative copper bar 2231B can be fixed by bolts to form a component. At the same time, the copper bar seat 2234 is designed with a plurality of second fixing holes 22345, and the second fixing holes 22345 are inlaid with metal inserts which are respectively higher than the two end surfaces of the plastic part, and can be used for grounding the capacitor 2236 and fixing the entire copper bar 2231 assembly; the copper bar seat 2234 is designed with a plurality of fixing structures 22346 which assist in positioning the transfer copper sheet 2235, and the fixing structures 22346 are used for supporting and fixing the copper sheet for subsequent welding.

[0079] In some embodiments, Figure 25 and Figure 26As shown, a boss round hole 22351 is designed on the adapter copper sheet 2235. The pin 22361 of the capacitor 2236 is passed through the boss round hole 22351 and then fixed and laser welded. At the same time, a flanging structure 22352 is also designed on the adapter copper sheet 2235, and the flanging structure 22352 is used for positioning with the capacitor 2236; a tapered structure 22353 is also designed on the adapter copper sheet 2235, and a slot structure 22347 is on the copper row seat 2234. The tapered structure 22353 is inserted into the slot structure 22347 on the copper row seat 2234. The tapered structure 22353 can fix the adapter copper sheet 2235 and prevent the adapter copper sheet 2235 from falling off during use.

[0080] In some embodiments, as Figure 27 and Figure 28 shown, two capacitors 2236 are arranged at the front end of the magnetic ring 2233 and installed with the adapter copper sheet 2235. Here, the capacitor 2236 is a Y capacitor, and the power supply common mode noise is suppressed and absorbed by the front-end Y capacitor. Three capacitors 2236 are arranged at the rear end of the magnetic ring 2233 and installed with the adapter copper sheet 2235. Here, the capacitor 2236 is two Y capacitors and one X capacitor. The power supply differential mode and common mode noises can be suppressed and absorbed by the rear-end X capacitor and Y capacitor. After the entire DC component 223 is installed, it can be integrally potted to ensure the reliability and durability during later use.

[0081] In some embodiments, as Figure 29 shown, two groups of DC components 223 are arranged in the accommodation cavity 2211 of the power supply box housing 221. The DC components 223 are symmetrically designed with respect to the vertical plane passing through the geometric center point in the accommodation cavity 2211, and the vertical plane is parallel to the extension direction of the power supply box housing 221. At the same time, in order to facilitate the heat dissipation of the copper row 2231, a heat conductive pad is arranged between the DC component 223 and the power supply box housing 221. The heat conductive pad is added below the DC component 223 to contact and conduct with the power supply box housing 221 to dissipate heat from the copper row 2231.

[0082] In some embodiments, in combination with Figure 18 and Figure 29 shown, in order to improve compatibility, the DC input part in the dual-motor controller is separated and independently formed into a current shunting structural member. The power supply box housing 221 has two DC interfaces. The installation points of the power supply box housing 221 and the DC interfaces are symmetrically designed with respect to the vertical plane respectively. The controller 210 is hermetically connected to the power supply box housing 221. The symmetric design can change the DC outgoing line direction through different installation methods, meet the layout of front and rear drives, and can simultaneously meet the use of single-motor and dual-motor, greatly improving compatibility, effectively realizing product generalization and platformization, and can effectively reduce costs.

[0083] In some embodiments, as Figure 30As shown in the figure, in order to protect the entire part, the shunt box 220 further includes an upper cover 224. The upper cover 224 cooperates with the power box housing 221 to close the accommodation cavity 2211 of the power box housing 221, thereby protecting the DC components 223 and other related components in the accommodation cavity 2211. At the same time, considering that the copper busbar 2231 in the DC component 223 is the main heat-generating device, in order to accelerate heat dissipation, the upper cover 224 has a breathing valve 2241 communicating with the outside, and the air in the accommodation cavity 2211 is convected through the breathing valve 2241.

[0084] An embodiment of the present invention further provides an automobile, which includes a motor drive system. The motor drive system can be a single-motor drive system or a dual-motor drive system. The automobile is powered by the motor drive system, and the power is transmitted to the wheels through a transmission mechanism.

[0085] The above is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A motor drive system, characterized in that, Comprising: A motor controller system including a controller; A motor system including a motor, an oil injection structure being mounted on the motor, the motor including a motor rotor and an oil slinger, the motor rotor including a rotor shaft; A reduction gearbox which is respectively connected to the motor controller system and the motor system; Wherein, the oil injection structure has at least oil injection ports arranged in three different directions, a first oil groove is provided on the motor housing, the first oil groove is close to the end face of the stator core, the opening direction of the first oil groove is parallel to the first direction, and part of the oil injection ports face the first oil groove so that the coolant is sprayed into the first oil groove; The motor housing is further provided with a second oil groove, and part of the oil injection ports face the second oil groove so that the coolant is sprayed into the second oil groove. In the case where the motor housing and the motor stator are assembled, the second oil grooves communicate to form a first oil path; The rear end cover of the motor has a second oil path, the first oil path and the second oil path communicate, the second oil path communicates with the rotor shaft of the motor rotor, an oil injection hole is provided on the rotor shaft, a keyway is provided on the rotor shaft, the oil injection hole communicates with the keyway, the coolant can flow from the second oil groove into the rotor shaft and then flow into the keyway through the oil injection hole, the oil slinger is installed at intervals between the rotor iron cores, the oil slinger is provided with an oil guiding groove, the oil guiding groove communicates with the keyway, and the first direction is the axial direction of the motor.

2. The motor drive system according to claim 1, characterized in that The number of the first oil grooves is multiple, and the multiple first oil grooves are arranged on the motor housing in the circumferential direction and communicate with each other.

3. The motor drive system according to claim 2, wherein, An opening is provided on one side of the first oil groove close to the stator core, and the first oil groove communicates with the wire groove of the stator core through the opening so that part of the coolant flows into the wire groove.

4. The motor drive system according to claim 1, wherein, The oil injection structure includes an oil inlet device and an oil injection ring, the oil inlet device communicates with the two oil injection rings respectively, the two oil injection rings are respectively located at both ends of the motor housing, the oil injection ports are located on the oil injection ring, and the oil injection ring is fixed on the motor housing.

5. The motor drive system according to claim 4, wherein The oil injection ring has two inlets, and an annular boss is provided at the inlet position of the oil injection ring, and the annular boss is connected with the motor housing in a matching manner.

6. The motor drive system according to claim 4, wherein, The opening direction of the second oil groove is perpendicular to the opening direction of the first oil groove.

7. The motor drive system according to claim 6, characterized in that, The motor system further includes a connecting pipe, the connecting pipe includes a first connecting pipe and a second connecting pipe, the first connecting pipe communicates the first oil path and the second oil path, and the second connecting pipe communicates the second oil path with the rotor shaft of the motor rotor.

8. The motor drive system according to any one of claims 1 to 7, characterized in that, The motor system includes two motors, the two motors are respectively fixed on both sides of the reduction gearbox, and the motors and the reduction gearbox share an end cover; The motor controller system includes two controllers and a shunt box, the two controllers are respectively located on both sides of the shunt box and are connected to the shunt box, and the motor system is electrically connected to the motor controller system.

9. The motor drive system according to claim 8, wherein The shunt box includes a power box housing, a connector and a DC component. The connector and the DC component are located in the accommodation cavity of the power box housing. A groove structure is provided at the input end of the busbar in the DC component. The input end is matched with the connector. A first fixing hole for the busbar is provided at the output end of the busbar, and the output end is connected to the electrical equipment.

10. The motor drive system according to claim 9, wherein, The busbar includes a positive busbar and a negative busbar. The positive busbar and the negative busbar are adjacent to each other and pass through a common magnetic ring. The negative busbar is covered with insulating paper.

11. The motor drive system according to claim 10, wherein, A busbar seat is further installed in the accommodation cavity of the power box housing. The busbar seat is provided with a busbar slot, a capacitor chamber and a magnetic ring chamber. The busbar slot is used to isolate the positive busbar from the negative busbar. The busbar slot, the capacitor chamber and the magnetic ring chamber are integrally potted.

12. The motor drive system according to claim 9, characterized in that, Two groups of DC components are arranged in the accommodation cavity of the power box housing. The DC components are symmetrically designed with respect to the vertical plane passing through the geometric center point in the accommodation cavity. The vertical plane is parallel to the extending direction of the power box housing. A heat conductive pad is provided between the DC component and the power box housing.

13. The motor drive system according to claim 12, wherein The power box housing has two DC interfaces. The mounting points of the power box housing and the DC interfaces are symmetrically designed with respect to the vertical plane respectively. The controller is hermetically connected to the power box housing.

14. The motor drive system according to claim 12, characterized in that, The shunt box further includes an upper cover. The upper cover is matched with the power box housing to close the accommodation cavity of the power box housing. The upper cover has a breathing valve communicating with the outside.

15. An automobile, characterized in that, Including: The motor drive system according to any one of claims 1 to 14, a transmission mechanism and a wheel. The motor drive system provides power. The transmission mechanism connects the wheel and the motor drive system to drive the wheel to rotate.

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