A dual motor system and cooling method thereof

Abstract

The present invention discloses a dual motor system and a cooling method for its application, wherein the dual motor system comprises a first motor, a second motor and a motor controller, wherein the first motor comprises a first housing, a first cavity is arranged in the first housing, the second motor comprises a second housing, a second cavity is arranged in the second housing, cooling oil flows in both the first cavity and the second cavity, the motor controller comprises a controller housing, a first heat transfer cavity connected to the first cavity is arranged between the first housing and the controller housing, and a second heat transfer cavity connected to the second cavity is arranged between the second housing and the controller housing, a heat dissipation water channel is arranged in the controller housing, and the heat dissipation water channel comprises a first water channel located on one side of the first heat transfer cavity and a second water channel located on one side of the second heat transfer cavity. The first motor and the second motor are cooled by oil cooling, and the cooling effect is high; heat exchange is realized by using cooling water in the motor controller and cooling oil in the first motor and the second motor, and the structure is simple and the integration is high.

Description

Technical field:

[0001] The invention relates to a dual-motor system and a cooling method used in the system. Background technology:

[0002] The motor system includes the motor and the motor controller. To ensure the normal operation of the motor and the motor controller, the motor and the motor controller need to be cooled during operation. At present, most of the drive motor systems used in automobiles are liquid cooled, and liquid cooling can be divided into water cooling and oil cooling. Water cooling uses a special coolant for the car to cool the motor and the motor controller, but this cooling generally only cools the stator housing, and requires the addition of a cooling water jacket, which increases the size and volume of the motor. If the integrated design with the motor controller is adopted, the volume of the entire solution is not conducive to the chassis integration layout. Oil cooling is to fill the motor housing with cooling oil, and the stator assembly and rotor assembly in the motor housing are immersed in the oil, but in order to lower the temperature of the oil, a separate oil cooling heat exchanger needs to be added. Moreover, oil cooling is currently only used for motor cooling, and is not integrated with the motor controller for cooling, resulting in a low degree of integration. In the dual-motor system used in automobiles, it includes two motors and a click controller, and the motor controller controls the two motors at the same time. If oil cooling is used, each motor needs to have an additional oil cooling heat exchanger to dissipate heat and oil cooling, making the structure of the entire system more complicated. Summary of the invention:

[0003] The purpose of the present invention is to provide a dual-motor system and a cooling method thereof, which can solve the problems of complex heat dissipation structure and low integration in the existing dual-motor system.

[0004] The purpose of the present invention is achieved through the following technical solutions.

[0005] The first object of the present invention is to provide a dual-motor system, comprising a first motor, a second motor and a motor controller, wherein the motor controller drives the first motor and the second motor to work, and is characterized in that: the first motor comprises a first housing, a first cavity is provided in the first housing, a first rotating shaft, a first rotor assembly and a first stator assembly are arranged in the first cavity, the second motor comprises a second housing, a second cavity is provided in the second housing, a second rotating shaft, a second rotor assembly and a second stator assembly are arranged in the second cavity, cooling oil flows in both the first cavity and the second cavity, the motor controller comprises a controller housing, the first housing and the second housing are respectively connected to the controller housing, a first heat transfer cavity is provided between the first housing and the controller housing, and the first cavity is communicated with the first heat transfer cavity, a second heat transfer cavity is provided between the second housing and the controller housing, and the second cavity is communicated with the second heat transfer cavity, a heat dissipation water channel is provided in the controller housing, and the heat dissipation water channel comprises a first water channel located on one side of the first heat transfer cavity and a second water channel located on one side of the second heat transfer cavity.

[0006] The above-mentioned first shell includes a first shell body, a first front end cover and a first rear end cover, the second shell includes a second shell body, a second front end cover and a second rear end cover, the controller is arranged between the first rear end cover and the second rear end cover, the first rear end cover is provided with two first oil injection ports to connect the first cavity with the first heat transfer cavity, and a first liquid oil pump is installed in one of the first oil injection ports, and the second rear end cover is provided with two second oil injection ports to connect the second cavity with the second heat transfer cavity, and a second liquid oil pump is installed in one of the second oil injection ports.

[0007] A third cavity is provided in the controller housing of the motor controller described above, and the first water channel and the second water channel are respectively located in the upper panel at the top and the lower panel at the bottom of the third cavity. A bus capacitor, a first drive unit, a second drive unit and a control unit are installed in the third cavity. The control unit controls the operation of the first drive unit and the second drive unit. The first drive unit drives the first motor to operate, and the second drive unit drives the second motor to operate. The first drive unit is close to the first water channel, and the second drive unit is close to the second water channel.

[0008] The controller housing is provided with a water inlet and a water outlet, the water inlet is connected to the first water channel, the water outlet is connected to the second water channel, the first water channel and the second water channel are connected through a connecting water channel, and the connecting water channel is located on one side of the third cavity.

[0009] The first water channel and the second water channel are connected in series via a connecting water channel.

[0010] The above-mentioned controller housing includes a housing body, an upper panel installed on the top of the housing body, and a lower panel installed on the bottom of the housing body. The third cavity is located in the housing body and the third cavity is sealed by the upper panel and the lower panel. The first water channel is arranged in the upper panel, the second water channel is arranged in the lower panel, and the connecting water channel is arranged in the housing body.

[0011] The above-mentioned control unit is installed in the middle of the third cavity, the first drive unit and the second drive unit are installed on the upper and lower sides of the control unit respectively, the bus capacitor is installed next to the control unit, the IGBT of the first drive unit is close to the upper panel, the IGBT of the second drive unit is close to the lower panel, and the bus capacitor is closely connected to the water channel.

[0012] A first annular convex edge protrudes upward from the top surface of the upper panel, the first water channel protrudes from the top surface and is located in the first annular convex edge, the first heat transfer cavity is formed between the upper panel, the first annular convex edge and the first rear end cover, a second annular convex edge protrudes downward from the bottom surface of the lower panel, the second water channel protrudes from the bottom surface and is located in the second annular convex edge, the second heat transfer cavity is formed between the lower panel, the second annular convex edge and the second rear end cover.

[0013] The first water channel and the second water channel have the same structure. The second water channel includes a plurality of transverse water channels arranged at intervals. The transverse water channels are parallel to each other, and two adjacent transverse water channels are connected by a longitudinal water channel.

[0014] The above-mentioned transverse water channels are connected in series through the longitudinal water channel.

[0015] The second object of the present invention is to provide a cooling method for a dual-motor system, wherein the dual-motor system includes a first motor, a second motor and a motor controller, wherein the motor controller is installed between the first motor and the second motor, wherein the motor controller only drives the first motor or the motor controller only drives the second motor or the motor controller simultaneously drives and controls the first motor and the second motor, wherein the first motor and the second motor have an oil-cooled self-circulating structure inside, and the motor controller has a water-cooled structure, wherein a cooling water channel is arranged on the controller housing of the motor controller and forms a water circulation heat dissipation with the outside, and wherein the cooling channel is realized by utilizing the circulating cooling oil inside the first motor and the second motor to contact with the surface of the controller housing to transfer heat, and then the heat is taken away by the water circulation inside the controller housing, thereby realizing the cooling of the oil inside the first motor and the second motor.

[0016] Compared with the prior art, the present invention has the following effects:

[0017] 1) The dual motor system comprises a first motor, a second motor and a motor controller, wherein the motor controller drives the first motor and the second motor to work, and is characterized in that: the first motor comprises a first housing, a first cavity is provided in the first housing, a first rotating shaft, a first rotor assembly and a first stator assembly are provided in the first cavity, the second motor comprises a second housing, a second cavity is provided in the second housing, a second rotating shaft, a second rotor assembly and a second stator assembly are provided in the second cavity, cooling oil flows in both the first cavity and the second cavity, and the motor controller comprises a controller housing, the first housing and the second housing are respectively connected to the controller housing, and the first housing is connected to the controller housing. A first heat transfer cavity is provided between the motor housing and the first cavity is communicated with the first heat transfer cavity, a second heat transfer cavity is provided between the second housing and the controller housing and the second cavity is communicated with the second heat transfer cavity, a heat dissipation water channel is provided in the controller housing, and the heat dissipation water channel includes a first water channel located on one side of the first heat transfer cavity and a second water channel located on one side of the second heat transfer cavity; the first motor and the second motor are cooled by oil cooling, the effect is high, and the volume of the first motor and the second motor is small; the cooling water in the motor controller is used to achieve heat exchange with the higher temperature cooling oil in the first motor and the second motor, so as to cool the cooling oil, without adding an oil cooling heat exchanger, and the structure is simple and the integration is high.

[0018] 2) Other advantages of the present invention are described in detail in the embodiment section. Description of the drawings:

[0019] Figure 1 is a three-dimensional diagram of a dual-motor system provided in Embodiment 1 of the present invention;

[0020] Figure 2 This is an exploded view of the dual motor system;

[0021] Figure 3 It is a side view of the dual motor system;

[0022] Figure 4 yes Figure 3 AA section view;

[0023] Figure 5 yes Figure 3 BB cross-sectional view;

[0024] Figure 6 yes Figure 5 Enlarged view of point C;

[0025] Figure 7 is a three-dimensional diagram of a motor controller in a dual-motor system;

[0026] Figure 8 This is an exploded diagram of the motor controller;

[0027] Fig. 9 This is a cooling method for a dual-motor system provided in Embodiment 2 of the present invention, and a schematic diagram of the flow direction of cooling oil and cooling water when the dual-motor system is used;

[0028] Fig.10 yes Fig. 9 Enlarged view of point D. Specific implementation method:

[0029] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0030] Embodiment 1:

[0031] like Figures 1 to 8As shown, the present embodiment provides a dual-motor system, including a first motor 1, a second motor 2 and a motor controller 3, wherein the motor controller 3 drives the first motor 1 and the second motor 2 to work, and is characterized in that: the first motor 1 includes a first housing 11, a first cavity 10 is provided in the first housing 11, a first rotating shaft 12, a first rotor assembly 13 and a first stator assembly 14 are provided in the first cavity 10, the second motor 2 includes a second housing 21, a second cavity 20 is provided in the second housing 21, a second rotating shaft 22, a second rotor assembly 23 and a second stator assembly 24 are provided in the second cavity 20, and a first rotating shaft 22, a second rotor assembly 23 and a second stator assembly 24 are provided in the first cavity 10 The first and second cavities 20 are both filled with cooling oil. The motor controller 3 includes a controller housing 31. The first housing 11 and the second housing 21 are connected to the controller housing 31 respectively. A first heat transfer cavity 41 is provided between the first housing 11 and the controller housing 31, and the first cavity 10 is connected to the first heat transfer cavity 41. A second heat transfer cavity 42 is provided between the second housing 21 and the controller housing 31, and the second cavity 20 is connected to the second heat transfer cavity 42. A heat dissipation water channel is provided in the controller housing 31, and the heat dissipation water channel includes a first water channel 361 located on one side of the first heat transfer cavity 41 and a second water channel 362 located on one side of the second heat transfer cavity 42. The first motor 1 and the second motor 2 are cooled by oil cooling, which has a high effect and a small volume. The cooling water in the motor controller 3 is used to achieve heat exchange with the higher temperature cooling oil in the first motor 1 and the second motor 2 to achieve cooling of the cooling oil, without the need to add an oil cooling heat exchanger, and has a simple structure and high integration.

[0032] The first housing 11 includes a first housing body 111, a first front cover 112 and a first rear cover 113, the second housing 21 includes a second housing body 211, a second front cover 212 and a second rear cover 213, the controller 3 is arranged between the first rear cover 113 and the second rear cover 213, the first rear cover 113 is provided with two first oil injection ports 114 to connect the first cavity 10 with the first heat transfer cavity 41, one of the first oil injection ports 114 is installed with a first oil pump 15, the second rear cover 213 is provided with two second oil injection ports 214 to connect the second cavity 20 with the second heat transfer cavity 42, one of the second oil injection ports 214 is installed with a second oil pump 25. The structure is simple and compact, and the assembly is convenient.

[0033] The two first oil injection ports 114 are symmetrically arranged on both sides of the second rotating shaft 12 , and the two second oil injection ports 214 are symmetrically arranged on both sides of the second rotating shaft 22 .

[0034] The controller housing 31 of the motor controller 3 is provided with a third cavity 30, the first water channel 361 and the second water channel 362 are respectively located in the upper panel 311 at the top and the lower panel 312 at the bottom of the third cavity 30, the bus capacitor 35, the first drive unit 32, the second drive unit 33 and the control unit 34 are installed in the third cavity 30, the control unit 34 controls the first drive unit 32 and the second drive unit 33 to work, the first drive unit 32 drives the first motor 1 to work, the second drive unit 33 drives the second motor 2 to work, the first drive unit 32 is close to the first water channel 361, and the second drive unit 33 is close to the second water channel 362. The first water channel 361 dissipates heat for the first drive unit 32 and the cooling oil in the first heat transfer cavity 41 at the same time, and the second water channel 362 dissipates heat for the cooling oil in the second drive unit 33 and the second heat transfer cavity 42 at the same time, further simplifying the structure.

[0035] The controller housing 31 is provided with a water inlet 363 and a water outlet 364 . The water inlet 363 is connected to the first water channel 361 , and the water outlet 364 is connected to the second water channel 362 . The first water channel 361 and the second water channel 362 are connected via a connecting water channel 365 , and the connecting water channel 365 is located on one side of the third cavity 30 .

[0036] The first water channel 361 and the second water channel 362 are connected in series via a connecting water channel 365 .

[0037] The controller housing 31 comprises a housing body 310, an upper panel 311 mounted on the top of the housing body 310, and a lower panel 312 mounted on the bottom of the housing body 310, the third cavity 30 is located in the housing body 310, and the top and bottom of the third cavity 30 are sealed by the upper panel 311 and the lower panel 312, respectively, the first water channel 361 is arranged in the upper panel 311, the second water channel 362 is arranged in the lower panel 312, and the connecting water channel 365 is arranged in the housing body 310. The controller housing 31 has a simple structure and is easy to process.

[0038] The control unit 34 is installed in the middle of the third cavity 30, the first drive unit 32 and the second drive unit 33 are installed on the upper and lower sides of the control unit 34 respectively, the bus capacitor 35 is installed beside the control unit 34, the IGBT of the first drive unit 32 is close to the upper panel 311, the IGBT of the second drive unit 33 is close to the lower panel 312, and the bus capacitor 35 is close to the connecting water channel 365. The heat dissipation effect of the bus capacitor 35 and the IGBT is good, and the working temperature of the motor controller 3 is more stable.

[0039] The top surface 311 of the upper panel 311 protrudes upward with a first annular convex edge 313, the first water channel 361 protrudes from the top surface 311 and is located in the first annular convex edge 313, the first heat transfer cavity 41 is formed between the upper panel 311, the first annular convex edge 313 and the first rear end cover 113, the bottom surface of the controller housing 31 protrudes downward with a second annular convex edge 314, the second water channel 362 protrudes from the bottom surface and is located in the second annular convex edge 314, and the second heat transfer cavity 42 is formed between the lower panel 312, the second annular convex edge 314 and the second rear end cover 213. The structure is simple and the production is convenient.

[0040] The first water channel 361 and the second water channel 362 have the same structure, and the second water channel 362 includes a plurality of transverse water channels 366 arranged at intervals, each transverse water channel 366 is parallel to each other, and two adjacent transverse water channels 366 are connected by a longitudinal water channel 367. The first water channel 361 and the second water channel 362 have simple structures, and the heat transfer area in the first heat transfer cavity 41 and the second heat transfer cavity 42 is large, and the heat transfer effect is better.

[0041] Embodiment 2:

[0042] like Fig. 9 , Fig.10 As shown, the second object of the present invention is to provide a cooling method for a dual-motor system, the dual-motor system comprising a first motor 1, a second motor 2 and a motor controller 3, the motor controller 3 being installed between the first motor 1 and the second motor 2, the motor controller 3 only drives the first motor 1 or the motor controller 3 only drives the second motor 2 or the motor controller 3 drives and controls the first motor 1 and the second motor 2 at the same time, the first motor 1 and the second motor 2 adopt an oil-cooled self-circulating structure inside, the motor controller 3 adopts a water-cooling structure, a controller housing 31 of the motor controller 3 is provided with a cooling water channel and forms a water circulation heat dissipation with the outside, characterized in that: the circulating cooling oil in the first motor 1 and the second motor 2 is used to contact with the surface of the controller housing to transfer heat, and then the heat is taken away by the water circulation inside the controller housing, so as to realize the cooling of the oil inside the first motor 1 and the second motor 2.

[0043] Fig.10The flow direction of the cooling oil in the first heat transfer cavity 41 and the second heat transfer cavity 42 is shown. When the first motor 1 and the second motor 2 are working, the first water channel 361 and the second water channel 362 of the controller housing 31 cool down the IGBT of the first drive unit 32 and the second drive unit 33 on the one hand, and exchange heat with the cooling oil in the first heat transfer cavity 41 and the second heat transfer cavity 42 on the other hand, so as to cool the oil inside the first motor 1 and the second motor 2. Specifically, the cooling oil in the first motor 1 flows into the first heat transfer cavity 41 from the first oil injection port 114 where the first liquid oil pump 15 is not provided, and exchanges heat with the cooling water in the first water channel 361 in the first heat transfer cavity 41. The cooled cooling oil is sprayed into the first cavity 10 through the first liquid oil pump 15 to cool down the first rotating shaft 12, the first rotor assembly 13 and the first stator assembly 14 of the first motor 1. Similarly, the cooling oil in the second motor 2 flows into the second heat transfer cavity 42 from the second oil injection port 214 where the second oil pump 25 is not provided, and performs heat exchange with the cooling water in the second water channel 362 in the second heat transfer cavity 42. The cooled cooling oil is sprayed into the second cavity 20 through the second oil pump 25 to cool the second rotating shaft 22, the second rotor assembly 23 and the second stator assembly 24 of the second motor 2. The cooling cycles of the first motor 1 and the second motor 2 work independently.

[0044] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited thereto. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention are equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A dual motor system, comprising a first motor (1), a second motor (2) and a motor controller (3), wherein the motor controller (3) drives the first motor (1) and the second motor (2) to work, characterized in that: The first motor (1) comprises a first housing (11), a first cavity (10) is provided in the first housing (11), a first rotating shaft (12), a first rotor assembly (13) and a first stator assembly (14) are provided in the first cavity (10), the second motor (2) comprises a second housing (21), a second cavity (20) is provided in the second housing (21), a second rotating shaft (22), a second rotor assembly (23) and a second stator assembly (24) are provided in the second cavity (20), cooling oil flows in both the first cavity (10) and the second cavity (20), and the motor controller (3) comprises a controller housing (31 ), the first shell (11) and the second shell (21) are respectively connected to the controller shell (31); a first heat transfer cavity (41) is provided between the first shell (11) and the controller shell (31), and the first cavity (10) is communicated with the first heat transfer cavity (41); a second heat transfer cavity (42) is provided between the second shell (21) and the controller shell (31), and the second cavity (20) is communicated with the second heat transfer cavity (42); a heat dissipation water channel is provided in the controller shell (31), and the heat dissipation water channel comprises a first water channel (361) located on one side of the first heat transfer cavity (41) and a second water channel (362) located on one side of the second heat transfer cavity (42).

2. A dual motor system according to claim 1, characterized in that: The first housing (11) comprises a first housing body (111), a first front end cover (112) and a first rear end cover (113); the second housing (21) comprises a second housing body (211), a second front end cover (212) and a second rear end cover (213); the controller (3) is arranged between the first rear end cover (113) and the second rear end cover (213); the first rear end cover (113) is provided with two first oil injection ports (114) for connecting the first cavity (10) with the first heat transfer cavity (41); a first oil pump (15) is installed in one of the first oil injection ports (114); the second rear end cover (213) is provided with two second oil injection ports (214) for connecting the second cavity (20) with the second heat transfer cavity (42); a second oil pump (25) is installed in one of the second oil injection ports (214).

3. A dual motor system according to claim 2, characterized in that: A third cavity (30) is provided in a controller housing (31) of the motor controller (3); a first water channel (361) and a second water channel (362) are respectively located in an upper panel (311) at the top and a lower panel (312) at the bottom of the third cavity (30); a bus capacitor (35), a first drive unit (32), a second drive unit (33) and a control unit (34) are installed in the third cavity (30); the control unit (34) controls the first drive unit (32) and the second drive unit (33) to work; the first drive unit (32) drives the first motor (1) to work; the second drive unit (33) drives the second motor (2) to work; the first drive unit (32) is closely attached to the first water channel (361) and the second drive unit (33) is closely attached to the second water channel (362).

4. A dual motor system according to claim 3, characterized in that: The controller housing (31) is provided with a water inlet (363) and a water outlet (364); the water inlet (363) is connected to the first water channel (361); the water outlet (364) is connected to the second water channel (362); the first water channel (361) and the second water channel (362) are connected via a connecting water channel (365); and the connecting water channel (365) is located on one side of the third cavity (30).

5. A dual motor system according to claim 4, characterized in that: The first water channel (361) and the second water channel (362) are connected in series via a connecting water channel (365).

6. A dual motor system according to claim 4, characterized in that: The controller housing (31) comprises a housing body (310), an upper panel (311) installed on the top of the housing body (310), and a lower panel (312) installed on the bottom of the housing body (310); the third cavity (30) is located in the housing body (310) and the third cavity (30) is sealed by the upper panel (311) and the lower panel (312); the first water channel (361) is arranged in the upper panel (311), the second water channel (362) is arranged in the lower panel (312), and the connecting water channel (365) is arranged in the housing body (310).

7. A dual motor system according to claim 6, characterized in that: The control unit (34) is installed in the middle of the third cavity (30), the first drive unit (32) and the second drive unit (33) are installed on the upper and lower sides of the control unit (34) respectively, the bus capacitor (35) is installed next to the control unit (34), the IGBT of the first drive unit (32) is close to the upper panel (311), the IGBT of the second drive unit (33) is close to the lower panel (312), and the bus capacitor (35) is close to the connecting water channel (365).

8. A dual motor system according to any one of claims 3 to 7, characterized in that: A first annular convex edge (313) protrudes upward from the top surface of the upper panel (311); the first water channel (361) protrudes from the top surface and is located inside the first annular convex edge (313); the first heat transfer cavity (41) is formed between the upper panel (311), the first annular convex edge (313) and the first rear end cover (113); a second annular convex edge (314) protrudes downward from the bottom surface of the lower panel (312); the second water channel (362) protrudes from the bottom surface and is located inside the second annular convex edge (314); and the second heat transfer cavity (42) is formed between the lower panel (312), the second annular convex edge (314) and the second rear end cover (213).

9. A dual motor system according to claim 8, characterized in that: The first water channel (361) and the second water channel (362) have the same structure. The second water channel (362) includes a plurality of transverse water channels (366) arranged at intervals. The transverse water channels (366) are parallel to each other, and two adjacent transverse water channels (366) are connected by a longitudinal water channel (367).

10. A dual motor system according to claim 9, characterized in that: The transverse water channels (366) are connected in series via the longitudinal water channel (367).

11. A cooling method for a dual motor system, the dual motor system comprising a first motor (1), a second motor (2) and a motor controller (3), the motor controller (3) being installed between the first motor (1) and the second motor (2), the motor controller (3) only driving the first motor (1) or the motor controller (3) only driving the second motor (2) or the motor controller (3) driving and controlling the first motor (1) and the second motor (2) at the same time, the first motor (1) and the second motor (2) adopt an oil-cooled self-circulating structure inside, the motor controller (3) adopts a water-cooled structure, a controller housing of the motor controller (3) is provided with a cooling water channel to form a water circulation heat dissipation with the outside, characterized in that: The circulating cooling oil inside the first motor (1) and the second motor (2) is used to contact the surface of the controller housing to transfer heat, and the heat is then taken away by water circulation inside the controller housing, thereby cooling the oil inside the first motor (1) and the second motor (2).

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