Automotive flat wire oil-cooled motor

Abstract

The invention discloses a vehicle flat wire oil-cooled motor, belongs to the technical field of motor cooling, and aims to solve the problems caused by the fact that a vehicle flat wire motor adopts a traditional water-cooled structure. The motor comprises a rotor iron core, a flat wire winding, a stator iron core, a motor shell, a stator iron core cooling liquid flow channel and a winding end portion cooling liquid flow channel. A stator iron core and a rotor iron core which are coaxial are sequentially arranged in the motor shell from outside to inside, and the flat wire winding is embedded in an inner circle stator groove of the stator iron core. A groove is formed in the yoke part of the stator core and is used for mounting a stator core cooling liquid flow channel, and the stator core cooling liquid flow channel is used for cooling the yoke part of the stator core; a groove is formed in the inner surface of the motor shell and used for installing a winding end cooling liquid flow channel, and the winding end cooling liquid flow channel is used for spraying and cooling the end of the flat wire winding.

Description

Technical Field

[0001] The present invention relates to a flat wire oil-cooled motor for vehicles, belonging to the technical field of motor cooling. Background Art

[0002] With the increasing market demand for motor miniaturization and lightweight, it promotes the development of motors towards high power density. Especially in the field of flat wire motors for new energy vehicles, the requirements for motor power density have risen sharply. These requirements are accompanied by an increase in the heat generation inside the motor, especially the heat generation in the motor winding and stator core parts. Excessive motor temperature will lead to problems such as accelerated insulation aging of the drive motor winding and deformation of the stator and rotor. Therefore, choosing a suitable cooling method to cool the heat-generating parts of the motor in a timely manner is the key to ensuring the long-term stable operation of the motor.

[0003] Currently, the common cooling method for motors is water cooling. For flat wire motors for vehicles, traditional water cooling structures are often used, which require the design of cooling water channels. This not only increases the overall size of the motor but also cannot directly cool the heat source. Moreover, the magnetic conductivity and electrical conductivity characteristics of water also limit its application scenarios. Summary of the Invention

[0004] In order to solve the above problems existing in the traditional water cooling structure of flat wire motors for vehicles, the present invention provides a flat wire oil-cooled motor for vehicles.

[0005] The flat wire oil-cooled motor for vehicles according to the present invention includes a rotor core 1, a flat wire winding 2, a stator core 3, a motor housing 4, a stator core coolant flow channel 5, and a winding end coolant flow channel 6;

[0006] Inside the motor housing 4, a stator core 3 and a rotor core 1 are arranged coaxially from outside to inside in sequence, and the flat wire winding 2 is embedded in the inner circular stator slots 3-1 of the stator core 3;

[0007] Grooves are formed in the yoke part of the stator core 3 and are used to install the stator core coolant flow channel 5, and the stator core coolant flow channel 5 is used to cool the yoke part of the stator core 3;

[0008] Grooves are formed in the inner surface of the motor housing 4 and are used to install the winding end coolant flow channel 6, and the winding end coolant flow channel 6 is used to spray-cool the ends of the flat wire winding 2.

[0009] Preferably, a coolant inlet 4-1 is formed in the top wall surface of the motor housing 4 for connecting to external coolant; two oil outlets are formed in the bottom wall surface of the motor housing 4, namely a first coolant outlet 4-2 and a second coolant outlet 4-3, and the two oil outlets are used to discharge the coolant to the outside.

[0010] Preferably, the coolant flow channels 5 of the stator core are S-shaped channels composed of a plurality of circumferential flow channels 5-3 and a plurality of axial flow channels 5-4. An S-shaped groove is formed on the outer circumferential surface of the yoke part of the stator core 3, and the S-shaped flow channel is embedded in the S-shaped groove. An oil inlet hole 5-1 is arranged in the middle of the axial flow channel at the head end of the S-shaped flow channel, and a first oil guiding port 5-2 is arranged on the axial flow channel at the tail end of the S-shaped flow channel. The oil inlet hole 5-1 is communicated with the coolant inlet 4-1 of the motor housing 4. The external coolant enters the coolant flow channels 5 of the core through the coolant inlet 4-1 and the oil inlet hole 5-1, and finally flows out from the first oil guiding port 5-2 at the tail end and enters the coolant flow channels 6 of the winding end part.

[0011] Preferably, the inside of the coolant flow channels 5 of the stator core is set as a spiral channel.

[0012] Preferably, the coolant flow channels 6 of the winding end part include a front-end arc-shaped oil spraying ring 6-1, an oil guiding plate 6-2 and a rear-end arc-shaped oil spraying ring 6-3. The front-end arc-shaped oil spraying ring 6-1 and the rear-end arc-shaped oil spraying ring 6-3 are respectively formed on the front and rear ends of the inner circumferential surface at the top of the motor housing 4. The middle parts of the two parallel arc-shaped oil spraying rings are communicated through the axially arranged oil guiding plate 6-2. A second oil guiding port 6-4 is arranged in the middle of the lower surface of the oil guiding plate 6-2. The second oil guiding port 6-4 is communicated with the first oil guiding port 5-2 of the coolant flow channels 5 of the stator core. The coolant flowing out from the coolant flow channels 5 of the stator core enters the oil guiding plate 6-2 of the coolant flow channels 6 of the winding end part through the second oil guiding port 6-4. The coolant is divided into two front and rear paths and enters the front-end arc-shaped oil spraying ring 6-1 and the rear-end arc-shaped oil spraying ring 6-3 at the same time. A plurality of front-end oil spraying holes 6-5 are formed on the inner circumferential surface of the front-end arc-shaped oil spraying ring 6-1, and a plurality of rear-end oil spraying holes 6-6 are formed on the inner circumferential surface of the rear-end arc-shaped oil spraying ring 6-3. The front-path coolant is sprayed on the front end part 2-1 of the flat wire winding 2 through the plurality of front-end oil spraying holes 6-5, and the rear-path coolant is sprayed on the rear end part 2-2 of the flat wire winding 2 through the plurality of rear-end oil spraying holes 6-6. The two paths of coolant are gathered to the bottom of the motor housing along the two end parts of the flat wire winding 2 under the action of gravity and are discharged to the outside through two oil outlet ports.

[0013] Preferably, the first oil guiding port 5-2 and the second oil guiding port 6-4 are square ports.

[0014] Preferably, an external oil pumping device is further included. The inlet and outlet of the external oil pumping device are respectively connected to the two oil outlet ports at the bottom of the motor housing 4 and the coolant inlet 4-1. The external oil pumping device is used to cool the coolant discharged from the two oil outlet ports at the bottom of the motor housing 4 and then pump it into the coolant flow channels 5 of the stator core and the coolant flow channels 6 of the winding end part through the coolant inlet 4-1 at the top of the motor housing 4.

[0015] Advantages of the present invention: The oil-cooling pipeline of the present invention is installed on the yoke of the stator core, eliminating the need for an additional cooling pipeline. The cooling medium directly contacts the heat source, which can effectively reduce the temperature rise of the stator and the winding, and improve the heat dissipation effect of the motor. The cooling oil enters the cooling channel of the stator core yoke through the oil inlet hole of the stator core yoke, and then flows along the outer surface of the stator core through the spiral channel for cooling. At the same time, part of the cooling oil flows to the arc-shaped oil spraying ring through the oil guiding port. The cooling oil can be evenly distributed through the spiral channel, and the convective heat transfer effect of the cooling oil is also better, making the cooling effect of the motor better.

[0016] The oil itself has the properties of non-magnetic and non-conductive, which has no impact on the operation of the motor. Choosing oil as the cooling medium for the vehicle flat wire motor has become the development trend of the cooling medium for new energy drives. Brief Description of the Drawings

[0017] Figure 1 is an exploded view of a vehicle flat wire oil-cooled motor according to the present invention;

[0018] Figure 2 is a schematic structural diagram of the coolant flow channel of the stator core;

[0019] Figure 3 is a schematic structural diagram of the coolant flow channel for installing the winding end on the motor housing;

[0020] Figure 4 is a schematic structural diagram of the coolant flow channel of the winding end;

[0021] Figure 5 is a schematic structural diagram of installing the stator core coolant flow channel on the stator core;

[0022] Figure 6 is a schematic structural diagram of the flat wire winding;

[0023] Figure 7 is a diagram of the coolant flow process.

[0024] Reference Numerals: 1. Rotor Core;

[0025] 2. Flat Wire Winding; 2-1. Front End of the Winding, 2-2. Rear End of the Winding;

[0026] 3. Stator Core; 3-1. Stator Slot;

[0027] 4. Motor Housing; 4-1. Coolant Inlet, 4-2. First Coolant Outlet, 4-3. Second Coolant Outlet;

[0028] 5. Stator Core Coolant Flow Channel; 5-1. Oil Inlet Hole, 5-2. First Oil Guiding Port, 5-3. Circumferential Flow Channel, 5-4. Axial Flow Channel;

[0029] 6. Cooling liquid flow path at the end of the winding; 6-1. Front-end arc-shaped oil spraying ring, 6-2. Oil guiding plate, 6-3. Rear-end arc-shaped oil spraying ring, 6-4. Second oil guiding port, 6-5. Front-end oil spraying hole, 6-6. Rear-end oil spraying hole. Detailed implementation mode

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0031] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but it is not limited to the present invention.

[0033] Detailed implementation mode one: The following will be combined with Figures 1 to 7 This implementation mode will be described. The flat wire oil-cooled motor for a vehicle described in this implementation mode includes a rotor core 1, a flat wire winding 2, a stator core 3, a motor housing 4, a stator core cooling liquid flow path 5, and a winding end cooling liquid flow path 6;

[0034] Inside the motor housing 4, the stator core 3 and the rotor core 1 are arranged coaxially from outside to inside in sequence, and the flat wire winding 2 is embedded in the inner circle stator slot 3-1 of the stator core 3;

[0035] A groove is opened in the yoke of the stator core 3 and used to install the stator core cooling liquid flow path 5, and the stator core cooling liquid flow path 5 is used to cool the yoke of the stator core 3;

[0036] A groove is opened on the inner surface of the motor housing 4 and used to install the winding end cooling liquid flow path 6, and the winding end cooling liquid flow path 6 is used to spray and cool the end of the flat wire winding 2.

[0037] A cooling liquid inlet 4-1 is opened on the top wall surface of the motor housing 4 for connecting external cooling liquid; two oil outlets are opened on the bottom wall surface of the motor housing 4, namely a first cooling liquid outlet 4-2 and a second cooling liquid outlet 4-3, and the two oil outlets are used to discharge the cooling liquid to the outside.

[0038] The cooling liquid in this implementation mode uses an oil working medium.

[0039] The stator core coolant flow channel 5 is an S-shaped flow channel composed of a plurality of circumferential flow channels 5-3 and a plurality of axial flow channels 5-4. An S-shaped groove is formed on the outer circumferential surface of the yoke part of the stator core 3, and the S-shaped flow channel is embedded in the S-shaped groove. An oil inlet hole 5-1 is arranged in the middle of the axial flow channel at the head end of the S-shaped flow channel, and a first oil guiding port 5-2 is arranged on the axial flow channel at the tail end of the S-shaped flow channel. The oil inlet hole 5-1 is communicated with the coolant inlet 4-1 of the motor housing 4. External coolant enters the core coolant flow channel 5 through the coolant inlet 4-1 and the oil inlet hole 5-1, and finally flows out from the first oil guiding port 5-2 at the tail end and enters the coolant flow channel 6 at the winding end. The S-shaped flow channel is arranged on the outer circumferential surface of the yoke part of the stator core 3, evenly occupying most of its area. The coolant travels along the S-shaped flow channel under the dual action of pressure and gravity, fully cooling the yoke part of the stator core 3 with good effect. And this way of embedding the flow channel in the groove does not additionally increase the volume of the motor and does not affect the overall size of the motor.

[0040] The inside of the stator core coolant flow channel 5 is set as a spiral channel. The coolant can be evenly distributed through the spiral channel, and at the same time, the convective heat transfer effect of the cooling oil is better, making the cooling effect of the motor better.

[0041] The coolant flow channel 6 at the winding end includes a front-end arc-shaped oil spraying ring 6-1, an oil guiding plate 6-2, and a rear-end arc-shaped oil spraying ring 6-3. The front-end arc-shaped oil spraying ring 6-1 and the rear-end arc-shaped oil spraying ring 6-3 are respectively formed on the front and rear ends of the inner circumferential surface at the top of the motor housing 4. The middle parts of the two parallel arc-shaped oil spraying rings are communicated through the axially arranged oil guiding plate 6-2. A second oil guiding port 6-4 is arranged in the middle of the lower surface of the oil guiding plate 6-2. The second oil guiding port 6-4 is communicated with the first oil guiding port 5-2 of the stator core coolant flow channel 5. The coolant flowing out from the stator core coolant flow channel 5 enters the oil guiding plate 6-2 of the coolant flow channel 6 at the winding end through the second oil guiding port 6-4. The coolant is divided into two front and rear paths and enters the front-end arc-shaped oil spraying ring 6-1 and the rear-end arc-shaped oil spraying ring 6-3 at the same time. A plurality of front-end oil spraying holes 6-5 are formed on the inner circumferential surface of the front-end arc-shaped oil spraying ring 6-1, and a plurality of rear-end oil spraying holes 6-6 are formed on the inner circumferential surface of the rear-end arc-shaped oil spraying ring 6-3. The front-path coolant is sprayed on the front-end part 2-1 of the flat wire winding 2 through the plurality of front-end oil spraying holes 6-5, and the rear-path coolant is sprayed on the rear-end part 2-2 of the flat wire winding 2 through the plurality of rear-end oil spraying holes 6-6 to achieve cooling. The two paths of coolant converge to the bottom of the motor housing along the two ends of the flat wire winding 2 under the action of gravity and are discharged to the outside through two oil outlet ports. The cooling effect is better, and the temperature rise at the winding end of the motor can be effectively inhibited. And this way of embedding the flow channel in the groove does not additionally increase the volume of the motor and does not affect the overall size of the motor.

[0042] The first oil guiding port 5-2 and the second oil guiding port 6-4 are square ports.

[0043] Furthermore, an external coolant pumping device is further included. The inlet and outlet of the external coolant pumping device are respectively connected to two oil outlets at the bottom of the motor housing 4 and the coolant inlet 4-1. The external coolant pumping device is used to cool the coolant discharged from the two oil outlets at the bottom of the motor housing 4, and then pump it into the stator core coolant flow path 5 and the winding end coolant flow path 6 through the coolant inlet 4-1 at the top of the motor housing 4.

[0044] Although the present invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed, as long as they do not depart from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein can be combined in a manner different from that described in the original claims. It should also be understood that the features described in connection with a single embodiment can be used in other described embodiments.

Claims

1. A flat wire oil-cooled motor for a vehicle, characterized in that: It comprises a rotor core (1), a flat wire winding (2), a stator core (3), a motor housing (4), a stator core coolant flow channel (5) and a winding end coolant flow channel (6); A coaxial stator core (3) and a rotor core (1) are sequentially arranged inside a motor housing (4) from outside to inside, and a flat wire winding (2) is embedded in an inner stator slot (3-1) of the stator core (3); A groove is provided on the yoke of the stator core (3) and is used for installing a stator core coolant flow channel (5), wherein the stator core coolant flow channel (5) is used for cooling the yoke of the stator core (3); A groove is provided on the inner surface of the motor housing (4) and is used to install a winding end cooling liquid flow channel (6), wherein the winding end cooling liquid flow channel (6) is used to spray cool the end of the flat wire winding (2).

2. According to claim 1, a flat wire oil-cooled motor for a vehicle is characterized in that: A coolant inlet (4-1) is provided on the top wall of the motor housing (4) for receiving external coolant; two oil outlets are provided on the bottom wall of the motor housing (4), namely a first coolant outlet (4-2) and a second coolant outlet (4-3), and the two oil outlets are used to discharge the coolant to the outside.

3. The flat wire oil-cooled motor for a vehicle according to claim 2, characterized in that: The stator core coolant flow channel (5) is an S-shaped flow channel composed of a plurality of circumferential flow channels (5-3) and a plurality of axial flow channels (5-4). An S-shaped groove is provided on the outer circumferential surface of the yoke of the stator core (3). The S-shaped flow channel is embedded in the S-shaped groove. An oil inlet hole (5-1) is provided in the middle of the axial flow channel at the head end of the S-shaped flow channel. A first oil guide port (5-2) is provided on the axial flow channel at the tail end of the S-shaped flow channel. The oil inlet hole (5-1) is connected to a coolant inlet (4-1) of a motor housing (4). External coolant enters the core coolant flow channel 5 through the coolant inlet (4-1) and the oil inlet hole (5-1), and finally flows out from the first oil guide port (5-2) at the tail end and enters the coolant flow channel (6) at the winding end.

4. The flat wire oil-cooled motor for vehicle according to claim 3, characterized in that: The interior of the stator core coolant flow channel (5) is arranged as a spiral channel.

5. The flat wire oil-cooled motor for vehicle according to claim 3, characterized in that: The winding end cooling liquid flow channel (6) comprises a front end arc-shaped oil pouring ring (6-1), an oil guide plate (6-2) and a rear end arc-shaped oil pouring ring (6-3). The front end arc-shaped oil pouring ring (6-1) and the rear end arc-shaped oil pouring ring (6-3) are respectively provided at the front and rear ends of the inner circular surface of the top of the motor housing (4). The middle parts of the two parallel arc-shaped oil pouring rings are connected through the axially arranged oil guide plate (6-2). The middle part of the lower surface of the oil guide plate (6-2) is provided with a second oil guide port (6-4). The second oil guide port (6-4) is connected with a first oil guide port (5-2) of the stator core cooling liquid flow channel (5). The cooling liquid flowing out of the stator core cooling liquid flow channel (5) enters the winding end cooling liquid flow channel (6-6) through the second oil guide port (6-4). ), the coolant is divided into two paths, front and rear, and enters the front arc-shaped oil sprinkler ring (6-1) and the rear arc-shaped oil sprinkler ring (6-3) at the same time; the inner circular surface of the front arc-shaped oil sprinkler ring (6-1) is provided with a plurality of front oil spray holes (6-5); the inner circular surface of the rear arc-shaped oil sprinkler ring (6-3) is provided with a plurality of rear oil spray holes (6-6); the front path coolant is sprayed on the front winding end portion (2-1) of the flat wire winding (2) through the plurality of front oil spray holes (6-5); the rear path coolant is sprayed on the rear winding end portion (2-2) of the flat wire winding (2) through the plurality of rear oil spray holes (6-6); the two paths of coolant are collected along the two ends of the flat wire winding (2) to the bottom of the motor housing under the action of gravity, and are discharged to the outside through two oil outlets.

6. The flat wire oil-cooled motor for vehicle according to claim 4, characterized in that: The first oil guide port (5-2) and the second oil guide port (6-4) are square ports.

7. The flat wire oil-cooled motor for vehicle according to claim 4, characterized in that: It also includes an external oil pumping device, the inlet and outlet of which are respectively connected to two oil outlets at the bottom of the motor housing (4) and a coolant oil inlet (4-1), and the external oil pumping device is used to cool the coolant discharged from the two oil outlets at the bottom of the motor housing (4), and then pump the coolant into the stator core coolant flow channel (5) and the winding end coolant flow channel (6) through the coolant oil inlet (4-1) at the top of the motor housing (4).

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