A motor with liquid cooling function

Abstract

The application discloses a liquid-cooled motor, and belongs to the technical field of motor equipment. The motor shaft is provided with an oil inlet cavity, and the rotor core is provided with an oil flow channel in communication with the oil inlet cavity. The balance ring is provided with a transition oil cavity in communication with the oil flow channel, and a plurality of oil throwing blades are arranged in the transition oil cavity. In this way, the oil inlet cavity, the oil flow channel, the transition oil cavity of the balance ring and the oil throwing blades are combined in multiple modes, and a new cooling mode is adopted to increase the contact area and cooling efficiency of the cooling oil, the rotor core, the magnetic steel and the stator winding. The motor temperature can be quickly and effectively reduced at a low manufacturing cost, the stability of the motor during high-load and long-time operation is ensured, and motor failure caused by overheating is reduced.

Description

Technical Field

[0001] This application relates to the field of motor equipment technology, and in particular to a motor with liquid cooling function. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the performance requirements for new energy motors are increasing. If the large amount of heat generated during motor operation cannot be dissipated effectively and in a timely manner, it will seriously affect the motor's efficiency, lifespan, and reliability. Oil cooling, as a highly efficient heat dissipation method, is widely used in new energy motors. Among these methods, the oil-throwing structure on the motor shaft plays a crucial role in the heat dissipation effect of the oil cooling system.

[0003] Traditional motor shaft oil-throwing structures have many problems in practical applications, such as uneven oil throwing leading to inconsistent cooling effects in different parts of the motor, affecting the overall performance of the motor; oil throwing cannot solve the problem of magnet overheating; and the oil throwing port is far from the end of the winding, so it cannot cool the winding. Utility Model Content

[0004] This application provides a motor with liquid cooling function. This solves the problem of poor oil cooling effect in existing motors. The technical solution is as follows: On the one hand, a drive motor is provided, the drive motor comprising: a housing, a motor shaft, a rotor core, a balance ring, and windings; The motor shaft is rotatably connected to the housing, and the portion of the motor shaft distributed inside the housing has an oil inlet chamber extending along the axial direction of the motor shaft, as well as an oil inlet port and an oil outlet port respectively connected to the oil inlet chamber. The oil inlet port is used to connect to an external oil supply system. The rotor core is sleeved on the outer side of the motor shaft and has an oil flow channel inside. The inlet of the oil flow channel is connected to the oil outlet. The balance ring is synchronously fixed to the side of the rotor core and has a transition oil cavity, an oil inlet and a first oil outlet respectively connected to the transition oil cavity, and a plurality of oil-throwing blades arranged in an axial array around the balance ring and fixed in the transition oil cavity. Each oil-throwing blade has a gap between the side facing the oil inlet and the side wall of the balance ring where the oil inlet is opened. The oil inlet is connected to the outlet of the oil flow channel. The winding is installed inside the housing, and the first oil outlet is oriented toward the winding.

[0005] Optionally, the oil outlet extends in a direction parallel to the radial direction of the motor shaft.

[0006] Optionally, there may be multiple oil outlet holes, which are distributed at equal intervals along the axial direction of the motor shaft.

[0007] Optionally, the inner diameter of the oil inlet chamber is larger than the inner diameter of the oil outlet hole.

[0008] Optionally, the number of outlets of the oil flow channel is multiple, the number of oil inlets of the balance ring is multiple, and the multiple oil inlets correspond one-to-one with the outlets of the multiple oil flow channels.

[0009] Optionally, the balance ring may have multiple first oil outlet holes, which are distributed at equal intervals around the axis of the balance ring.

[0010] Optionally, the oil flow channel includes: a plurality of first flow channels and a plurality of second flow channels distributed around the rotor core, wherein the first flow channels extend radially along the rotor core, and the extension direction of the second flow channels is parallel to the axial direction of the rotor core; wherein one end of the first flow channel is connected to the oil outlet hole, the other end of the first flow channel is connected to the second flow channel, and the second flow channel is connected to the oil inlet hole.

[0011] Optionally, the bottom of the housing has an oil guide port, through which oil entering the housing is transported to the external oil supply system.

[0012] The beneficial effects of the technical solutions provided in this application include at least the following: By incorporating an oil inlet chamber in the motor shaft and an oil flow channel communicating with the inlet chamber inside the rotor core, while the balance ring has a transition oil chamber communicating with the oil flow channel and multiple oil-throwing blades within the transition oil chamber, this novel cooling method combines multiple approaches—the oil inlet chamber, oil flow channel, transition oil chamber of the balance ring, and oil-throwing blades—to increase the contact area and cooling efficiency between the cooling oil and the rotor core, magnets, and stator windings. This allows for rapid and effective reduction of motor temperature at a lower manufacturing cost, ensuring motor stability under high loads and long-term operation, and reducing motor failures caused by overheating. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a cross-sectional view of a motor with liquid cooling function provided in an embodiment of this application; Figure 2 This is a partial structural cross-sectional view of a balance ring provided in an embodiment of this application; Figure 3 This is a schematic diagram of the arrangement of an oil-throwing blade provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a balance ring provided in an embodiment of this application; Figure 5 This is a partial structural diagram of a motor with liquid cooling function provided in an embodiment of this application; Figure 6 This is a schematic diagram of the structure of a rotor core provided in an embodiment of this application; Figure 7 This is a cross-sectional view of another motor provided in an embodiment of this application.

[0015] The components include: outer shell 100, motor shaft 200, rotor core 300, balance ring 400, winding 500, external oil supply system A, oil inlet chamber Q, oil inlet k, oil outlet k1, oil flow channel 301, inlet k2, transition oil chamber Q1, oil inlet k3, first oil outlet k4, outlet k5, oil slinger blade 401, first flow channel 301a, and second flow channel 301b.

[0016] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0018] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0019] Please refer to Figures 1-5 , Figure 1 This is a cross-sectional view of a liquid-cooled motor provided in an embodiment of this application. Figure 2 This is a partial structural cross-sectional view of a balance ring provided in an embodiment of this application. Figure 3 This is a schematic diagram illustrating the arrangement of an oil-slinging blade according to an embodiment of this application. Figure 4 This is a schematic diagram of the structure of a balance ring provided in an embodiment of this application. Figure 5 This is a partial structural diagram of a liquid-cooled motor according to an embodiment of this application. The motor can be a permanent magnet synchronous motor, and the liquid-cooled motor may include: a housing 100, a motor shaft 200, a rotor core 300, a balance ring 400, and a winding 500.

[0020] The motor shaft 200 of the liquid-cooled motor can be rotatably connected to the housing 100. The portion of the motor shaft 200 distributed within the housing 100 can have an oil inlet chamber Q extending axially along the motor shaft 200, and an oil inlet k and an oil outlet k1 respectively communicating with the oil inlet chamber Q. The oil inlet k of the motor shaft 200 can be used to connect to an external oil supply system A. Here, the extending direction of the oil outlet k1 of the motor shaft 200 can be parallel to the radial direction of the motor shaft 200. There can be multiple oil outlets k1, and these multiple oil outlets k1 are evenly distributed around the axial direction of the motor shaft 200.

[0021] The rotor core 300 of the liquid-cooled motor is sleeved on the outer side of the motor shaft and has an oil flow channel 301 inside. The inlet k2 of the oil flow channel 301 is connected to the oil outlet k1 of the motor shaft 200.

[0022] In a liquid-cooled motor, a balance ring 400 is synchronously fixed to the side of the rotor core 300 and has a transition oil chamber Q1, an oil inlet hole k3 and a first oil outlet hole k4 respectively connected to the transition oil chamber Q1, and multiple oil-throwing blades 401 arranged in an axial array around the balance ring 400 and fixed within the transition oil chamber Q1. Each oil-throwing blade 401 has a gap z between its side facing the oil inlet hole k3 and the side wall of the balance ring 400 where the oil inlet hole k3 is located. The oil inlet hole k3 is connected to the outlet k5 of the oil flow channel 301. Here, there can be two balance rings 400, each fixed to one side of the rotor core 300. The deflection direction of the oil-throwing blades 401 corresponds to the rotation direction of the motor shaft 200, for example, as shown in the diagram. Figure 3 As shown, the motor shaft 200 rotates counterclockwise, and multiple oil-throwing blades 401 deflect counterclockwise. The balance ring 400 can have multiple first oil outlet holes k4, which are evenly distributed around the axis of the balance ring 400. This ensures the uniformity of the cooling oil and the effective cooling of the windings.

[0023] The winding 500 of the liquid-cooled motor is installed inside the housing 100, and the first oil outlet k4 of the balance ring 400 is oriented toward the winding 500.

[0024] For example, an axially oriented oil inlet chamber Q is formed inside the motor shaft 200 for storing and transporting cooling oil. One end of the oil inlet chamber Q is provided with an oil inlet k connected to an external oil supply system A to ensure that cooling oil can continuously and stably enter the motor shaft 200. The motor shaft 200 is provided with an oil outlet k1. Under the action of oil pressure and centrifugal force, the cooling oil enters the oil flow channel 301 in the rotor core 300 through the oil outlet k1, carrying away the heat source of the rotor core 300 and the magnets. As the rotor core 300 rotates at high speed, the cooling oil, under the action of centrifugal force, enters the transition oil chamber Q1 of the balance ring 400 from the oil flow channel 301 outlet k5 on both sides of the rotor core 300 and the oil inlet k3 of the balance ring 400. Under the action of the oil-throwing blades 401 inside the balance ring 400, it is accelerated and thrown through the first oil outlet k4 towards the stator winding 500, directly accelerating the heat dissipation of the winding 500.

[0025] In this embodiment, an oil inlet chamber Q is provided in the motor shaft 200, and an oil flow channel 301 communicating with the oil inlet chamber Q is provided inside the rotor core 300. The balance ring 400 is provided with a transition oil chamber Q1 communicating with the oil flow channel 301, and multiple oil-throwing blades 401 are provided within the transition oil chamber Q1. This combination of the oil inlet chamber Q, the oil flow channel 301, the transition oil chamber Q1 of the balance ring 400, and the oil-throwing blades 401, employs a novel cooling method that improves the contact area and cooling efficiency between the cooling oil and the rotor core 300, magnets, and stator windings 500. This allows for rapid and effective reduction of motor temperature at a lower manufacturing cost, ensuring motor stability under high load and long-term operation, and reducing motor failures caused by overheating.

[0026] In summary, this application provides a liquid-cooled motor, which may include: a housing, a motor shaft, a rotor core, a balance ring, and windings. By providing an oil inlet chamber in the motor shaft and an oil flow channel communicating with the oil inlet chamber inside the rotor core, and by providing a transition oil chamber communicating with the oil flow channel in the balance ring, and multiple oil-throwing blades disposed within the transition oil chamber, this combination of oil inlet chamber, oil flow channel, balance ring oil chamber, and oil-throwing blades, employs a novel cooling method that increases the contact area and cooling efficiency between the cooling oil and the rotor core, magnets, and stator windings. This allows for rapid and effective reduction of motor temperature at a lower manufacturing cost, ensuring motor stability under high load and long-term operation, and reducing motor failures caused by overheating.

[0027] In the embodiments of this application, such as Figure 1 As shown, the inner diameter of the oil inlet chamber Q of the motor shaft 200 can be larger than the inner diameter of the oil outlet hole k1. This ensures that the oil entering the oil flow channel 301 through the oil outlet hole k1 has a certain pressure.

[0028] Optional, please refer to Figure 6 , Figure 6 This is a schematic diagram of the structure of a rotor core provided in an embodiment of this application. The number of outlets k5 of the oil flow channel 301 in the rotor core 300 can be multiple, and the number of oil inlet holes k3 of the balance ring 400 can be multiple, and the multiple oil inlet holes k3 correspond one-to-one with the multiple outlets k5 of the oil flow channel 301.

[0029] In the embodiments of this application, please refer to Figure 6 and Figure 7 , Figure 7 This is a cross-sectional view of another motor provided in an embodiment of this application. The oil flow channel 301 in the rotor core 300 may include a plurality of first flow channels 301a and a plurality of second flow channels 301b distributed around the axial center of the rotor core 300. The first flow channels 301a extend radially along the rotor core 300, and the extension direction of the second flow channels 301b is parallel to the axial direction of the rotor core 300. One end of the first flow channel 301a is connected to the oil outlet k1 of the motor shaft 200, and the other end of the first flow channel 301a is connected to the second flow channel 301b. The second flow channel 301b is connected to the oil inlet k3 of the balance ring 400. Here, the plurality of first flow channels 301a and the plurality of second flow channels 301b are connected in a one-to-one correspondence.

[0030] In this application, the bottom of the housing 100 may have an oil guide port (not shown in the figure), through which the oil entering the housing 100 is transported to the external oil supply system A. The cooling oil is transported back to the external cooling system through the oil guide port and oil pipe of the housing. After cooling and filtration, it is reinjected into the motor shaft, forming a circulating cooling loop. Throughout the process, the coordinated action of the oil flow channels in the motor shaft and rotor core, the balance ring, and the oil slinger blades achieves comprehensive and efficient cooling of the motor rotor core, magnets, and stator windings.

[0031] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0032] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A motor with liquid cooling function, characterized in that, include: Housing, motor shaft, rotor core, balance rings, and windings; The motor shaft is rotatably connected to the housing, and the portion of the motor shaft distributed inside the housing has an oil inlet chamber extending along the axial direction of the motor shaft, as well as an oil inlet port and an oil outlet port respectively connected to the oil inlet chamber. The oil inlet port is used to connect to an external oil supply system. The rotor core is sleeved on the outer side of the motor shaft and has an oil flow channel inside. The inlet of the oil flow channel is connected to the oil outlet. The balance ring is synchronously fixed to the side of the rotor core and has a transition oil cavity, an oil inlet and a first oil outlet respectively connected to the transition oil cavity, and a plurality of oil-throwing blades arranged in an axial array around the balance ring and fixed in the transition oil cavity. Each oil-throwing blade has a gap between the side facing the oil inlet and the side wall of the balance ring where the oil inlet is opened. The oil inlet is connected to the outlet of the oil flow channel. The winding is installed inside the housing, and the first oil outlet is oriented toward the winding.

2. The motor with liquid cooling function according to claim 1, characterized in that, The oil outlet extends in a direction parallel to the radial direction of the motor shaft.

3. The motor with liquid cooling function according to claim 2, characterized in that, The number of oil outlet holes is multiple, and the multiple oil outlet holes are distributed at equal intervals along the axial direction around the motor shaft.

4. The motor with liquid cooling function according to claim 2, characterized in that, The inner diameter of the oil inlet chamber is larger than the inner diameter of the oil outlet hole.

5. The motor with liquid cooling function according to claim 1, characterized in that, The oil flow channel has multiple outlets, and the balance ring has multiple oil inlets, with each oil inlet corresponding to one of the multiple oil flow channel outlets.

6. The motor with liquid cooling function according to claim 1, characterized in that, The balance ring has multiple first oil outlet holes, which are evenly distributed around the axis of the balance ring.

7. The motor with liquid cooling function according to claim 1, characterized in that, The oil flow channel includes: a plurality of first flow channels and a plurality of second flow channels distributed around the rotor core, wherein the first flow channels extend radially along the rotor core, and the extension direction of the second flow channels is parallel to the axial direction of the rotor core; wherein, one end of the first flow channel is connected to the oil outlet hole, the other end of the first flow channel is connected to the second flow channel, and the second flow channel is connected to the oil inlet hole.

8. The motor with liquid cooling function according to any one of claims 1-7, characterized in that, The bottom of the housing has an oil guide port, through which oil entering the housing is transported to the external oil supply system.

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