Flat wire winding, motor and cooling system

Abstract

The utility model belongs to the technical field of motor cooling, and provides a flat wire winding, a motor and a cooling system.The flat wire winding comprises flat wire units, the interior of each flat wire unit is of a hollow structure, the hollow structures form a cooling channel for cooling liquid to flow, the flat wire units are connected to form a winding coil, and the winding coil is provided with a water inlet end and a water outlet end; the winding coils are connected in series or in parallel; the cooling assembly is connected with the water inlet end and the water outlet end and used for conveying the cooling liquid to the cooling passage; according to the invention, the cooling liquid can enter the interior of the flat wire winding through the cooling channel, the utilization rate of the cooling liquid is enhanced, the cooling liquid can better exchange heat generated in the flat wire winding with the outside, the heat dissipation performance is improved, and the operation power of the motor is improved to a greater extent.

Description

Technical Field

[0001] The present application relates to the technical field of motor cooling, and particularly to a flat wire winding, a motor and a cooling system. Background Art

[0002] At present, the driving motors used in new energy vehicles have relatively high requirements for motor performance. To improve motor performance and motor power density to meet the growing market demand, it is necessary to continuously optimize the motor heat dissipation performance so as to improve the peak power and rated power during motor operation.

[0003] In related technologies, different cooling schemes need to be selected for motors according to different motor usage scenarios and different motor performance requirements, such as natural cooling, air cooling, water cooling, built-in oil cooling, etc. Vehicle-grade driving motors and generators usually adopt water cooling and built-in oil cooling methods for cooling. This is because water-cooled motors and built-in oil-cooled motors can dissipate the heat inside the motor to the outside in time, and the cooling efficiency is greatly improved compared with air-cooled and natural-cooled motors. However, the coolant of water-cooled motors can only flow between the stator silicon steel sheets of the motor and the motor housing, and cannot efficiently dissipate the heat inside the stator winding of the motor to the outside in time. The built-in oil cooling method is a compensation for circulating water cooling. The cooling oil has insulating properties and can directly contact the stator winding of the motor to exchange heat with the outside more efficiently. However, the heat conduction performance of the cooling oil is not as good as that of the coolant, and the flow resistance is relatively large compared with the coolant. Therefore, the built-in oil cooling method does not improve the motor heat dissipation performance much. Summary of the Utility Model

[0004] In view of the above disadvantages of the prior art, the purpose of the present application is to provide a flat wire winding, a motor and a cooling system, which are used to solve the problem that the heat dissipation performance of the motor in the prior art needs to be improved.

[0005] To achieve the above object and other related objects, the present application provides a flat wire winding, including:

[0006] Flat wire units, the flat wire units are hairpin-shaped, the inside of the flat wire units is a hollow structure, the hollow structure forms a cooling passage for the coolant to flow through, the flat wire units are connected to each other to form a winding coil, the winding coil has a water inlet end and a water outlet end, and the winding coils are connected in series or parallel;

[0007] A cooling component, connected to the water inlet end and the water outlet end, for delivering the coolant to the cooling passage.

[0008] Optionally, the cooling component includes an inlet water distribution ring and an outlet water collecting ring, the inlet water distribution ring is connected to the water inlet end, the outlet water collecting ring is connected to the water outlet end, the inlet water distribution ring is provided with a water inlet, and the outlet water collecting ring is provided with a water outlet.

[0009] Optionally, a circulation path for the coolant to flow through is provided in the water inlet distributing ring and the water outlet collecting ring.

[0010] Optionally, the flat wire unit is hairpin-shaped.

[0011] Optionally, the surface of the flat wire unit is coated with an insulating material.

[0012] Based on the same inventive concept, the present application also provides a motor, comprising:

[0013] A stator core, on which an installation position for accommodating the flat wire unit is provided;

[0014] And the flat wire winding as described above, which is arranged at the installation position.

[0015] Based on the same inventive concept, the present application also provides a cooling system, comprising:

[0016] The motor as described above;

[0017] A liquid pump, connected to the water inlet distributing ring, for inputting the coolant into the flat wire winding;

[0018] A heat exchanger, connected to the water outlet collecting ring, for dissipating the heat in the coolant.

[0019] Optionally, the cooling system further comprises: a temperature sensor, arranged on the flat wire winding, for collecting the temperature of the winding coil.

[0020] Optionally, a flow meter and a pressure gauge are arranged between the liquid pump and the water inlet distributing ring, the flow meter is used for measuring the flow rate of the coolant, and the pressure gauge is used for measuring the water pressure of the coolant.

[0021] Optionally, the liquid pump is further connected to a coolant tank, and a filter for filtering the coolant is arranged in the coolant tank.

[0022] In the flat wire winding provided by the present application, a cooling path is formed through the hollow structure inside the flat wire unit. The coolant enters from the water inlet end by the cooling component, is distributed to each winding coil, and then is collected at the water outlet end and output by the cooling component. The coolant can enter the inside of the flat wire winding through the cooling path, enhancing the utilization rate of the coolant, enabling the coolant to better exchange the heat generated inside the flat wire winding with the outside, improving the heat dissipation performance, and thus enhancing the operating power of the motor to a greater extent. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the motor shown in an embodiment of the present application;

[0024] Figure 2 Schematic diagram of the connection between the flat wire unit and the cooling component in Figure 1 ;

[0025] Figure 3 Schematic diagram of the structure of the stator core in Figure 1 ;

[0026] Figure 4 Schematic diagram of the structure of the flat wire unit in Figure 1 ;

[0027] Figure 5 Schematic diagram of the structure of the cooling system shown in an embodiment of the present application.

[0028] Part number description

[0029] 1 - flat wire winding; 2 - stator; 3 - stator core; 4 - water inlet manifold; 5 - water outlet manifold; 6 - water outlet; 7 - water inlet; 8 - flat wire unit; 9 - connecting pipe; 10 - installation position; 11 - hollow structure; 12 - temperature sensor; 13 - pressure gauge; 14 - flow meter; 15 - liquid pump; 16 - filter; 17 - coolant tank; 18 - heat exchanger. Detailed implementation manners

[0030] The following specific embodiments illustrate the implementation manners of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification.

[0031] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions for the implementation of the present application. Therefore, they do not have any technical substance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present application can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present application. At the same time, the terms such as "front", "rear", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear description and are not used to limit the scope for the implementation of the present application. Any change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present application can be implemented.

[0032] It should be noted that during the operation of the motor, eddy current losses and hysteresis losses are generated in the stator and rotor silicon steel sheets, and copper losses are generated in the stator windings. The above losses will exist in the form of heat. With the large accumulation of heat, irreversible damage will be caused to the motor. Therefore, dissipating the heat generated during the operation of the motor in a timely manner can improve the performance of the motor. Existing automotive-grade drive motors and generators usually use water cooling and built-in oil cooling methods for cooling. The circulating water cooling scheme forms a coolant circulation water channel between the stator silicon steel sheet of the motor and the metal shell of the motor. The coolant is pressurized by an electronic water pump to make the coolant contact the outside of the stator iron core of the motor. The heat of the stator part of the motor is conducted into the coolant by using the good heat conduction performance of the coolant. The coolant then dissipates the heat to the outside through the heat exchanger in the vehicle to achieve heat dissipation. The built-in oil cooling scheme integrates oil cooling on the basis of the liquid cooling scheme. The specific scheme is to add an oil injector inside the motor stator and spray the cooling oil on the stator windings of the motor through the motor oil pump, so that the stator windings of the motor are completely immersed in the cooling oil. By designing the oil channel, it is avoided that the cooling oil contacts the motor rotor and increases the rotation resistance of the motor rotor. The cooling oil conducts the heat of the stator windings and conducts the heat into the cooling oil through a specific heat exchanger of the motor, thereby achieving the cooling of the stator windings of the motor. Since the stator windings have high requirements for insulation, the oil cooling method avoids the risk of short circuit of the motor windings. Compared with the traditional circulating liquid cooling method, the built-in oil cooling can better dissipate the heat in the stator windings of the motor to the outside. Therefore, the motor using this cooling technology can increase the maximum speed to more than 20,000 revolutions per minute, and can improve the power and performance while reducing the volume and weight.

[0033] Although water-cooled motors and built-in oil-cooled motors can dissipate the heat inside the motor to the outside in a timely manner, and have greatly improved cooling efficiency compared with traditional air-cooled and natural-cooled motors, both have deficiencies. Since the coolant of the water-cooled motor can only flow between the stator silicon steel sheet of the motor and the motor housing, it cannot efficiently dissipate the heat inside the stator windings of the motor to the outside in a timely manner. The heat generated inside the stator iron core and in the stator windings of the motor cannot be dissipated in a timely manner, thus limiting the performance of the motor. The built-in oil cooling is a compensation for the circulating water cooling. The circulating cooling oil is used to cool the inside of the stator iron core and the stator windings of the motor. The cooling oil has insulating properties and can directly contact the stator windings, and exchange heat with the outside more efficiently. However, the heat conduction performance of the cooling oil is not as good as that of the coolant, and the flow resistance is relatively large compared with the coolant, and the heat dissipation capacity inside the motor is insufficient. Therefore, the improvement of the built-in oil cooling method for the heat dissipation performance of the motor is not high.

[0034] Please refer to Figures 1 to 5 , this application exemplarily provides a flat wire winding, including:

[0035] The flat wire unit 8 is hairpin-shaped, and the inside of the flat wire unit 8 is a hollow structure 11. The hollow structure 11 forms a cooling passage for the coolant to flow through. The flat wire units 8 are connected to each other to form a winding coil. The winding coil has a water inlet end and a water outlet end, and the winding coils are connected in series or in parallel;

[0036] A cooling assembly, connected to the water inlet end and the water outlet end, for delivering the coolant to the cooling passage.

[0037] In the flat wire winding provided in this application, a cooling passage is formed by the hollow structure 11 inside the flat wire unit 8. The coolant enters from the water inlet end by the cooling assembly, is distributed to each winding coil, and then is collected at the water outlet end and output by the cooling assembly. The coolant can enter the inside of the flat wire winding 1 through the cooling passage, enhancing the utilization rate of the coolant, enabling the coolant to better exchange the heat generated inside the flat wire winding 1 with the outside, improving the heat dissipation performance, and thus enhancing the operating power of the motor to a greater extent.

[0038] In this embodiment, as Figure 1 and Figure 2 shown, the cooling assembly includes a water inlet distributing ring 4 and a water outlet collecting ring 5. The water inlet distributing ring 4 is connected to the water inlet end, the water outlet collecting ring 5 is connected to the water outlet end, a water inlet 7 is provided on the water inlet distributing ring 4, and a water outlet 6 is provided on the water outlet collecting ring 5.

[0039] It can be understood that a single winding coil is formed by connecting multiple flat wire units 8 to each other. The flat wire units 8 are connected by welding the head and tail to achieve a sealed connection between the flat wire units 8. The water inlet end of the winding coil and the water inlet distributing ring 4, and the water outlet end of the winding coil and the water outlet collecting ring 5 are respectively connected by a connecting pipe 9. The connecting pipe 9 is a bent structure.

[0040] Specifically, a circulation passage for the coolant to flow through is provided inside the water inlet distributing ring 4 and the water outlet collecting ring 5. The circulation passage is communicated with the cooling passage. The coolant is distributed into each winding coil through the water inlet distributing ring 4 and then collected and discharged by the water outlet collecting ring 5.

[0041] In this embodiment, the inner surface and the outer surface of the flat wire unit 8 are both coated with an insulating material. The coolant can be cooling oil or cooling water. Different cooling media can be replaced according to the cooling requirements and the motor performance requirements. Cooperating with the flow of the coolant in the cooling passage inside the flat wire unit 8, when the coolant is cooling water, it can be introduced into the inside of the flat wire winding 1 to improve the cooling performance. When the coolant is cooling oil, the flow resistance can be reduced.

[0042] In another embodiment, as Figure 1 and Figure 3 shown, this application also provides a motor, including:

[0043] The stator core 3 is provided with an installation position 10 for accommodating the flat wire unit 8;

[0044] And the flat wire winding 1 as described above is arranged on the installation position 10.

[0045] Specifically, a stator 2 is penetrated through the stator core 3, and the stator 2 is composed of permanent magnets.

[0046] In another embodiment, as Figure 5 shown, the present application also provides a cooling system, including:

[0047] The motor as described above;

[0048] A liquid pump 15, connected to the water inlet manifold 4, for inputting the coolant into the flat wire winding 1;

[0049] A heat exchanger 18, connected to the water outlet manifold 5, for dissipating the heat in the coolant.

[0050] The coolant is input from the water inlet manifold 4 into the flat wire winding 1 by the liquid pump 15, and then flows out from the water outlet manifold 5. The heat is carried by the coolant from inside the flat wire winding 1 into the heat exchanger 18, and the heat is dissipated to the outside, realizing the heat dissipation of the motor.

[0051] Specifically, the flat wire unit 8 is in a hairpin shape. With the hollow structure 11 of the flat wire unit 8, the weight reduction of the motor can also be improved. The hairpin shape of the flat wire unit 8 can provide a wider cooling path for the coolant, so that the coolant can circulate, reducing the resistance of the coolant liquid flow, thereby reducing the load of the liquid pump 15.

[0052] In some embodiments, the cooling system further includes: a temperature sensor 12, arranged on the flat wire winding 1, for collecting the temperature of the winding coil. Specifically, a flow meter 14 and a pressure gauge 13 are arranged between the liquid pump 15 and the water inlet manifold 4. The flow meter 14 is used to measure the flow rate of the coolant, and the pressure gauge 13 is used to measure the water pressure of the coolant. By feeding back the obtained temperature, flow rate and water pressure to the temperature control device, the power of the liquid pump 15 is adjusted according to the current motor working condition, so as to realize the temperature control of the flat wire winding 1, meet the cooling performance, and reduce the energy consumption required for motor cooling at the same time.

[0053] In detail, the liquid pump 15 is also connected to a coolant tank 17. A filter 16 for filtering the coolant is arranged in the coolant tank 17. The coolant enters the flat wire winding 1 from the water inlet manifold 4, circulates in the flat wire winding 1 and then converges to the water outlet manifold 5, and then enters the heat exchanger 18. After dissipating the heat carried by the coolant to the outside, it returns to the coolant tank.

[0054] In summary, in the flat wire winding provided in this application, a cooling passage is formed through the hollow structure 11 inside the flat wire unit 8. The coolant enters from the water inlet end by the cooling component, is distributed to each winding coil, and then is collected by the water outlet end to the cooling component for output. The coolant can enter the inside of the flat wire winding 1 through the cooling passage, enhancing the utilization rate of the coolant, enabling the coolant to better exchange the heat generated inside the flat wire winding 1 with the outside, improving the heat dissipation performance, thereby enhancing the operating power of the motor to a greater extent. At the same time, the motor using the flat wire unit 8 with the hollow structure 11 can increase the power under the same volume and weight, and can reduce the weight and volume of the motor under the same power condition, and there is also a significant improvement in the power density of the motor.

[0055] The above embodiments are only used to exemplarily illustrate the principles and effects of this application, rather than to limit this application. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in this application should still be covered by the claims of this application.

Claims

1. A flat wire winding, characterized in that: include: A flat wire unit, wherein the interior of the flat wire unit is a hollow structure, wherein the hollow structure forms a cooling passage for the circulation of a coolant, wherein the flat wire units are interconnected to form a winding coil, wherein the winding coil has a water inlet end and a water outlet end, and wherein the winding coils are connected in series or in parallel; A cooling component is connected to the water inlet and the water outlet, and is used to transport the coolant to the cooling passage.

2. The flat wire winding according to claim 1, characterized in that: The cooling component comprises a water inlet water splitting ring and a water outlet water collecting ring, the water inlet water splitting ring is connected to the water inlet end, the water outlet water collecting ring is connected to the water outlet end, the water inlet water splitting ring is provided with a water inlet, and the water outlet water collecting ring is provided with a water outlet.

3. The flat wire winding according to claim 2, characterized in that: The water inlet water dividing ring and the water outlet water collecting ring are provided with circulation passages for circulating the cooling liquid.

4. The flat wire winding according to claim 1, characterized in that: The flat wire unit is in the shape of a hairpin.

5. The flat wire winding according to claim 1, characterized in that: The surface of the flat wire unit is coated with insulating material.

6. A motor, characterized in that: include: A stator core, wherein the stator core is provided with a mounting position for accommodating the flat wire unit; And the flat wire winding according to any one of claims 1 to 5, wherein the flat wire winding is arranged at the mounting position.

7. A cooling system, characterized in that: include: The motor as claimed in claim 6; A liquid pump connected to the water inlet water diversion ring and used for inputting cooling liquid into the flat wire winding; A heat exchanger is connected to the water outlet water collecting ring and is used to dissipate heat in the coolant.

8. The cooling system according to claim 7, characterized in that: Also includes: The temperature sensor is arranged on the flat wire winding and is used to collect the temperature of the winding coil.

9. The cooling system according to claim 7, characterized in that: A flow meter and a pressure gauge are provided between the liquid pump and the water inlet water dividing ring, wherein the flow meter is used to measure the flow rate of the coolant, and the pressure gauge is used to measure the water pressure of the coolant.

10. The cooling system according to claim 7, characterized in that: The liquid pump is also connected to a coolant tank, and a filter for filtering the coolant is arranged in the coolant tank.

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