WO2022016745A1

WO2022016745A1 - New energy automobile, driving motor oil cooling system, and control method

Info

Publication number: WO2022016745A1
Application number: PCT/CN2020/127438
Authority: WO
Inventors: 于冰; 董江东; 张帅
Original assignee: 中车株洲电机有限公司
Priority date: 2020-07-22
Filing date: 2020-11-09
Publication date: 2022-01-27
Also published as: CN111799950A

Abstract

A new energy automobile, a driving motor oil cooling system, and a control method. The driving motor oil cooling system comprises a front-end cover (1) and a base (8). The front end cover (1) is provided with an oil inlet (11) and an oil outlet (12); an internal circulation space is provided with a temperature measuring element for measuring temperature of a stator and a winding, a speed measuring device for measuring a rotational speed of a driving motor, at least two flow guiding tubes (7) for guiding cooling oil to a component to be cooled, an adjusting device for adjusting the flow rate of the cooling oil entering the flow guiding tubes (7), and a controller (6). In the driving motor oil cooling system, different working conditions of the motor may be determined according to temperature data and rotational speed data, the flow rate of the cooling oil flowing through different flow guiding tubes (7) can be reasonably distributed according to actual conditions of the different working conditions, thereby implementing optimal oil capacity control under an optimal cooling effect, and reducing energy consumption; moreover, different parts of the motor are cooled in a targeted manner, thus improving the cooling effect.

Description

A new energy vehicle, drive motor oil cooling system, and control method

This application claims the priority of the Chinese patent application filed on July 22, 2020 with the application number 202010710040.0 and the invention title "A new energy vehicle, oil cooling system for driving motor, and control method", the entire contents of which are Incorporated herein by reference.

technical field

The invention relates to the technical field of new energy vehicles, and more particularly, to an oil cooling system for a driving motor. In addition, the present invention also relates to a new energy vehicle including the above-mentioned driving motor oil cooling system and a control method suitable for the above-mentioned driving motor oil cooling system.

Background technique

At present, motor cooling technologies include air cooling, water cooling and oil cooling. Most industrial motors use air cooling technology, rail traction and new energy vehicle traction mostly use water cooling technology, and a small number of automotive motors use oil cooling technology. The air-cooled motor cannot guarantee the sealing performance, and the cooling effect is average, so it is obviously not suitable for precision new energy vehicle motors.

Water cooling technology is an indirect cooling technology. The cooling effect is not very ideal. It cannot cool the windings at both ends of the stator iron core of the motor, nor can it cool the rotor iron core of the motor. Moreover, the air tightness of the water channel of the machine base is required. Very high, once leakage occurs, it will cause damage to the entire motor.

Oil cooling is a direct cooling technology, which has irreplaceable advantages in cooling effect. At the same time, it can directly lead the oil in the transmission. However, the existing oil cooling structure is relatively complicated, generally by machining pipes on the machine base. And drill holes to drop the cooling oil on the windings, the machine base is complicated to process, the consumables are many, and the cost is high; in the cooling process, the cooling oil is thrown to the end of the stator by the centrifugal force of the rotor through the hollow shaft for cooling. The cooling effect Affected by the motor speed, in the case of low speed, the cooling effect is not good, and the control of the oil quantity of the cooling oil is unreasonable.

To sum up, how to provide a drive motor oil cooling system that can reduce energy consumption and improve cooling effect is an urgent problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a driving motor oil cooling system, which can control the flow of cooling oil flowing through the guide pipe according to the data measured by the temperature measuring element and the speed measuring device, so as to realize the reasonable distribution of the cooling oil. , reduce energy consumption and improve cooling effect at the same time.

Another object of the present invention is to provide a control method suitable for the above-mentioned driving motor oil-cooling system, and a new energy vehicle including the above-mentioned driving motor oil-cooling system.

In order to achieve the above object, the present invention provides the following technical solutions:

An oil cooling system for a driving motor, comprising a front end cover and a machine base, wherein the front end cover and the machine base enclose an internal circulation space for cooling oil, and the front end cover is provided with an oil inlet and an oil outlet;

The inner circulation space is provided with a temperature measuring element for detecting the temperature of the stator and the winding, a speed measuring device for detecting the rotational speed of the driving motor, and at least two pipes for guiding the cooling oil entering from the oil inlet to the components to be cooled. a draft tube, a regulating device for adjusting the flow of cooling oil entering the draft tube, and a controller for adjusting the action of the regulating device according to the data measured by the temperature measuring element and the data measured by the speed measuring device;

The temperature measuring element, the speed measuring device and the adjusting device are all connected to the controller, and the guiding pipe is connected to the adjusting device.

Preferably, the guide tube includes a first guide tube for cooling the stator iron core and a second guide tube for cooling the end winding.

Preferably, the first guide pipe is provided with a first fuel injection nozzle, and the second guide pipe is provided with a second fuel injection nozzle.

Preferably, the first guide tube is provided with a plurality of first oil outlet holes, and the number of the first oil outlet holes at positions corresponding to the stator iron core is greater than that at the positions corresponding to the end windings The number of the first oil outlet holes;

The second guide tube is provided with a plurality of second oil outlet holes, and the number of the second oil outlet holes at the position corresponding to the stator iron core is less than the number of the second oil outlet holes at the position corresponding to the end winding. 2 The number of oil outlet holes.

Preferably, it also includes a flow diverter plate disposed between the guide tube and the end winding, and the flow divider plate is provided with a flow guide groove for evenly dropping the cooling oil onto the end winding.

Preferably, the regulating device is a flow ball valve, and the flow ball valve is connected to the controller.

Preferably, the temperature measuring element is a temperature sensor, the speed measuring device is a resolver sensor, and both the temperature sensor and the resolver sensor are connected to the controller.

A control method, applicable to the drive motor oil cooling system described in any one of the above, comprising:

Step S1, obtaining the temperature of the stator and the winding and the rotational speed of the motor;

Step S2, judge whether the temperature of the stator and the winding is greater than or equal to the preset temperature, if so, control to increase the oil amount of the cooling oil for cooling the end winding, if not, control to reduce the cooling oil for the end winding. The amount of cooling oil, or the amount of cooling oil that cools the end windings, remains unchanged;

Step S3, judging whether the rotational speed of the motor is greater than or equal to the preset rotational speed, if so, control to increase the amount of cooling oil that cools the stator iron core, and if not, control to decrease the cooling oil that cools the stator iron core , or the cooling oil that cools the stator core remains unchanged.

A new energy vehicle includes the drive motor oil cooling system described in any one of the above rights.

In the process of using the drive motor oil cooling system provided by the present invention, it is first necessary to measure the temperature of the stator and the winding through the temperature measuring element, measure the rotational speed of the motor through the speed measuring device, and transfer the measured temperature data and transfer data. are transmitted to the controller; the cooling oil flows in from the oil inlet, and the controller controls the flow of the cooling oil entering different diversion pipes according to the obtained temperature and speed data. Outflow to the external circulation system.

Compared with the prior art, the drive motor oil cooling system provided by the present invention can judge the different working conditions of the motor according to the temperature data and the rotational speed data, and reasonably allocate the cooling oil flowing through the different guide pipes according to the actual situation of the different working conditions. The flow rate can realize the optimal oil quantity control under the optimal cooling effect, reduce the energy consumption, and at the same time, the different parts of the motor can be cooled in a targeted manner to improve the cooling effect.

In addition, the present invention also provides a control method suitable for the above-mentioned driving motor oil-cooling system, and a new energy vehicle including the above-mentioned driving motor oil-cooling system.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative work.

1 is a schematic structural diagram of a specific embodiment of a drive motor oil cooling system provided by the present invention;

Fig. 2 is the principle schematic diagram of the drive motor oil cooling system provided by the present invention;

Fig. 3 is the structural representation of the first guide tube;

Fig. 4 is the structural representation of the second guide tube;

Fig. 5 is the structural representation of the distribution plate;

6 is a schematic structural diagram of a front end cover;

Figure 7 is a schematic diagram of the principle of two guide tubes under the control of the flow ball valve.

In Figure 1-7:

1 is the front cover, 11 is the oil inlet, 12 is the oil outlet, 2 is the temperature sensor, 3 is the resolver sensor, 4 is the manifold, 5 is the flow ball valve, 6 is the controller, 7 is the guide tube, 71 It is the first guide pipe, 711 is the first oil outlet, 72 is the second guide pipe, 721 is the second oil outlet, 8 is the machine base, 81 is the stator core, A is the large torque, and the copper loss increases , B is the high speed, the iron loss increases.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below 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, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The core of the present invention is to provide an oil cooling system for a driving motor, which can adjust the flow of cooling oil to different parts according to different working conditions of the motor, thereby reducing energy consumption and ensuring cooling effect. Another core of the present invention is to provide a new energy vehicle including the above-mentioned driving motor oil-cooling system and a control method suitable for the above-mentioned driving motor oil-cooling system.

Please refer to FIGS. 1-7, FIG. 1 is a schematic structural diagram of a specific embodiment of the drive motor oil cooling system provided by the present invention; FIG. 2 is a schematic schematic diagram of the drive motor oil cooling system provided by the present invention; Schematic diagram of the structure of the guide pipe; Figure 4 is the structural schematic diagram of the second guide pipe; Figure 5 is the structural schematic diagram of the dividing plate; Figure 6 is the structural schematic diagram of the front end cover; Schematic diagram of the principle.

The drive motor oil cooling system provided by this specific embodiment includes a front end cover 1 and a machine base 8, and the front end cover 1 and the machine base 8 enclose an internal circulation space for cooling oil, and the front end cover 1 is provided with an oil inlet 11 and an oil outlet mouth 12;

The inner circulation space is provided with a temperature measuring element for detecting the temperature of the stator and the winding, a speed measuring device for detecting the rotational speed of the driving motor, and at least two guide pipes for guiding the cooling oil entering from the oil inlet 11 to the components to be cooled 7. A regulating device for regulating the flow of cooling oil entering the diversion pipe 7 and a controller 6 for adjusting the action of the regulating device according to the data measured by the temperature measuring element and the data measured by the speed measuring device; the temperature measuring element, the speed measuring device and the adjustment The equipment is connected with the controller 6, and the guide pipe 7 is connected with the adjustment equipment.

In the process of using the oil cooling system for the drive motor provided by this specific embodiment, it is first necessary to measure the temperature of the stator and the winding through the temperature measuring element, measure the rotational speed of the motor through the speed measuring device, and combine the measured temperature data and the rotating speed. The read data are all transmitted to the controller 6; the cooling oil flows in from the oil inlet 11, and the controller 6 controls the flow of the cooling oil entering different guide pipes 7 according to the obtained temperature and rotational speed data. After being ejected, it flows out to the external circulation system through the oil outlet 12 .

It should be noted that the at least two guide tubes 7 mentioned in this specific embodiment mean that there are at least one guide tube 7 to cool down the stator core 81 , and the other to cool the end windings Cool down.

Preferably, the temperature measuring element can be set as the temperature sensor 2, the speed measuring device can be set as the resolver sensor 3, and the regulating device can be set as the flow ball valve 5. Of course, it can also be other structures that meet the requirements, which are determined according to the actual situation.

Compared with the prior art, the drive motor oil cooling system provided by this specific embodiment can judge different working conditions of the motor according to the temperature data and the rotational speed data, and reasonably allocate the water flowing through the different guide tubes 7 according to the actual conditions of the different working conditions. The flow of cooling oil can realize the optimal oil quantity control under the optimal cooling effect, reduce the energy consumption, and at the same time, the different parts of the motor can be cooled in a targeted manner to improve the cooling effect.

On the basis of the above embodiment, the guide tube 7 may include a first guide tube 71 for cooling the stator core 81, a second guide tube 72 for cooling the end winding, and the first guide tube 71 The flow pipe 71 is provided with a first fuel injection nozzle, and the second guide pipe 72 is provided with a second fuel injection nozzle.

It should be noted that the first fuel injection nozzle and the second fuel injection nozzle mentioned in this application document are collectively referred to as fuel injection nozzles.

During use, a plurality of first oil outlet holes 711 can be provided in the first guide tube 71 , and the number of the first oil outlet holes 711 corresponding to the stator core 81 is greater than that of the positions corresponding to the end windings. The number of the first oil outlet holes 711; the second guide tube 72 is provided with a plurality of second oil outlet holes 721, and the number of the second oil outlet holes 721 corresponding to the stator core 81 is less than that corresponding to the end windings The number of second oil outlet holes 721 at the location.

Therefore, in the process of use, as long as the cooling oil flows in the first guide tube 71 and the second guide tube 72, the temperature of the stator iron core 81 and the end windings can be lowered. The number of the first oil outlet holes 711 at the positions corresponding to the stator iron core 81 is relatively large, so it mainly has the effect of cooling the stator iron core 81; The number of oil outlet holes 721 is large, so it mainly has the effect of cooling the end winding.

In the process of use, when the output torque of the motor is large, the current in the stator winding is large, and the copper loss is obvious. In the situation shown in A, that is, the torque is large, the copper loss increases, and the heat generated by the motor winding increases. , the temperature sensor 2 will detect an increase in the temperature of the end winding. After the controller 6 obtains the temperature information of the end winding, it controls the action of the flow ball valve 5 to increase the flow of the cooling oil flowing through the second guide pipe 72, The flow rate of the cooling oil in the first guide tube 71 decreases; when the motor speed increases, the iron loss of the corresponding stator iron core 81 will increase, and the heat generated by the iron core will increase. The iron loss increases. At this time, the controller 6 controls to increase the flow rate of cooling oil flowing through the first guide pipe 71 and reduce the flow rate of the cooling oil flowing through the second guide pipe 72 according to the information received from the resolver sensor 3 .

On the basis of the above-mentioned embodiment, it also includes a diverter plate 4 disposed between the guide tube 7 and the end winding, and the diverter plate 4 is provided with a diversion groove for evenly dropping the cooling oil to the end winding.

The specific arrangement position and shape of the diversion groove in the diverter plate 4 need to be determined according to the actual situation, which will not be repeated here.

In addition to the above-mentioned drive motor oil-cooling system, the present invention also provides a control method suitable for the drive motor oil-cooling system disclosed in the above-mentioned embodiments, the control method comprising:

In step S1, the temperature of the stator and the winding and the rotational speed of the motor are obtained.

In the above step S1 , the temperature information of the stator and the windings can be obtained through the temperature sensor 2 , and the rotational speed information of the motor can be obtained through the resolver sensor 3 .

Step S2, determine whether the temperature of the stator and the winding is greater than or equal to the preset temperature, if so, control to increase the oil amount of the cooling oil for cooling the end windings, if not, control to reduce the cooling oil for cooling the end windings amount of oil.

When the temperature of the stator and the winding is higher than the preset temperature, the temperature of the end winding increases and the copper loss is obvious. Therefore, it is necessary to increase the amount of cooling oil for cooling the end winding.

In step S3, it is judged whether the rotational speed of the motor is greater than or equal to the preset rotational speed. If so, the amount of cooling oil for cooling the stator iron core 81 is controlled to increase, and if not, the cooling oil for cooling the stator iron core 81 is controlled to decrease. amount of oil.

When the rotational speed of the motor is greater than or equal to the preset rotational speed, the temperature of the stator iron core 81 increases, and the iron loss is obvious, so the amount of cooling oil for cooling the stator iron core 81 needs to be increased.

In addition, this application document also discloses a new energy vehicle, which includes the drive motor oil cooling system mentioned in any of the above, and other structures of the new energy vehicle can refer to the prior art, which will not be repeated here.

It should be noted that the first guide pipe 71 and the second guide pipe 72, the first oil outlet hole 711 and the second oil outlet hole 721, the first oil nozzle and the second oil nozzle mentioned in this application document The first and second in the nozzle are only to limit the difference in position, and there is no order of precedence.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. Any combination of all the embodiments provided by the present invention falls within the protection scope of the present invention, and is not repeated here.

A new energy vehicle, an oil cooling system for a driving motor, and a control method provided by the present invention are described above in detail. The principles and implementations of the present invention are described herein by using specific examples, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, the present invention can also be improved and modified several times, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

An oil cooling system for a drive motor, comprising a front end cover (1) and a machine base (8), wherein the front end cover (1) and the machine base (8) enclose an internal circulation space for cooling oil, the front end cover (1) An oil inlet (11) and an oil outlet (12) are provided;

It is characterized in that, the internal circulation space is provided with temperature measuring elements for detecting the temperature of the stator and winding, speed measuring equipment for detecting the rotational speed of the driving motor, and for guiding the cooling oil entering from the oil inlet (11) to the At least two guide tubes (7) of the component to be cooled, a regulating device for adjusting the flow of cooling oil entering the guide tubes (7), and a device for measuring the speed according to the data measured by the temperature measuring element and the speed measuring device The measured data adjusts the controller (6) for adjusting the action of the device;

The temperature measuring element, the speed measuring device and the adjusting device are all connected with the controller (6), and the guiding pipe (7) is connected with the adjusting device.
The oil cooling system for a driving motor according to claim 1, characterized in that, the guide tube (7) comprises a first guide tube (71) for cooling the stator core (81), for the opposite end A second guide tube (72) for cooling the outer winding.
The drive motor oil cooling system according to claim 2, characterized in that, the first guide pipe (71) is provided with a first fuel injection nozzle, and the second guide pipe (72) is provided with a second injection nozzle. Nozzle.
The drive motor oil cooling system according to claim 3, wherein a plurality of first oil outlet holes (711) are provided in the first guide pipe (71), and are connected with the stator iron core (81). ) the number of the first oil outlet holes (711) at the corresponding positions is more than the number of the first oil outlet holes (711) at the corresponding positions of the end windings;

The second guide tube (72) is provided with a plurality of second oil outlet holes (721), and the number of the second oil outlet holes (721) at the positions corresponding to the stator iron core (81) is less than The number of the second oil outlet holes (721) at positions corresponding to the end windings.
The drive motor oil cooling system according to claim 2, characterized in that it further comprises a shunt plate (4) arranged between the guide tube (7) and the end winding, the shunt plate (4) ) is provided with a guide groove for evenly dripping the cooling oil to the end winding.
The drive motor oil cooling system according to any one of claims 1-5, characterized in that, the regulating device is a flow ball valve (5), and the flow ball valve (5) is connected to the controller (6).
The drive motor oil cooling system according to any one of claims 1-5, wherein the temperature measuring element is a temperature sensor (2), the speed measuring device is a resolver sensor (3), and the temperature sensor (2) and the resolver sensor (3) are both connected to the controller (6).
A control method, characterized in that, applicable to the drive motor oil cooling system according to any one of the preceding claims 1-7, comprising:

Step S1, obtaining the temperature of the stator and the winding and the rotational speed of the motor;

Step S2, judge whether the temperature of the stator and the winding is greater than or equal to the preset temperature, if so, control to increase the oil amount of the cooling oil for cooling the end winding, if not, control to reduce the cooling oil for the end winding. The amount of cooling oil, or the amount of cooling oil that cools the end windings, remains unchanged;

Step S3, judging whether the rotational speed of the motor is greater than or equal to the preset rotational speed, if so, control to increase the amount of cooling oil that cools the stator iron core (81), ) of the cooling oil for cooling down, or the oil amount of the cooling oil for cooling the stator core (81) is kept constant.
A new energy vehicle, characterized in that it comprises the drive motor oil cooling system according to any one of the above claims 1-7.