Complex cooling system for driving motor

Abstract

The present invention relates to a complex cooling system for a driving motor. A cooling liquid circulates through an oil cooling flow path to cool a motor housing and a stator in contact with the motor housing. The air inside the motor, which circulates through a predetermined flow path due to the rotation of a rotor blade, is cooled through heat exchange while circulating through an air cooling flow path cooled by the circulation of the cooling liquid, and the cooled air can flow into the motor to cool the inside of the motor. Also provided according to the present invention is a complex dual cooling system for a driving motor, the system being capable of enhancing cooling efficiency by functioning in a complex and interactive manner.

Description

Composite cooling system for drive motor

[0001] The present invention relates to the configuration of a composite cooling system for a drive motor, and more particularly, to a composite cooling system for a drive motor in which a fluid cooling system and an air cooling system provided in an electric vehicle drive motor are mutually involved in cooling rather than being separate systems.

[0002] In general, a motor, which is one of the main components of an electric vehicle, is configured to include a stator (40) and a rotor (50) that is inserted into the stator (40) so as to be rotatable around a rotation axis.

[0003] During motor operation, high temperatures are generated in the stator (40) and rotor (50). As the temperature inside the motor increases, the motor's driving and power generation efficiency rapidly decline. Due to this problem, various researches are actively being conducted to cool the motor and maintain its driving and power generation efficiency.

[0004] Meanwhile, cooling methods for traction motors primarily used in railway vehicles include semi-enclosed and fully enclosed cooling systems. Semi-enclosed cooling systems utilize natural air cooling from the wind generated by the vehicle's movement, or forced air cooling using a cooling fan and a blower motor to drive the fan.

[0005] However, by applying a semi-closed housing structure, there is a disadvantage in that the lifespan of the motor is shortened due to the inflow of external foreign substances, which can cause the motor to malfunction.

[0006] In addition, the fully enclosed traction motor can significantly improve the maintainability of the motor because there is no inflow of external substances, but because the heat flow to the outside is small, the development of optimal cooling technology to solve the heat problem generated in the motor must be carried out.

[0007] In addition, the cooling system of conventional enclosed traction motors uses the forced air cooling system used in existing semi-enclosed induction motors, and there are no domestic or international research cases on cooling systems that use water cooling or oil cooling methods.

[0008] Prior art document: KR Patent Registration No. 10-1408869 (announced on June 18, 2014)

[0009] The purpose of an embodiment of the present invention is to provide a configuration of a composite cooling system for a dual drive motor in which the coolant cools the stator (40) when it comes into contact with the motor housing (10) and the motor housing (10) through circulation of the coolant flow path, the air inside the motor circulating through a predetermined flow path by rotation of the rotor blade (70) is cooled through heat exchange while circulating through the air cooling flow path cooled by the circulation of the coolant, and the cooled air is introduced into the motor to cool the inside of the motor.

[0010] In addition, another object of the present invention is to provide a configuration of a composite cooling system for a dual drive motor in which the composite cooling systems to which the embodiments of the present invention are applied are not systems that are configured and operated separately, but rather operate in a composite manner with each other to further improve cooling efficiency.

[0011] According to the present invention, a stator (40) forming a rotor (50) system; a rotor (50) provided inside the stator (40) and rotating around a rotation axis; a shaft (60) inserted inside the rotor (50) and rotating around the rotation axis; a rotor blade (70) provided in multiple numbers at a predetermined radial distance from the rotation axis at one end of the rotor (50) and generating a flow of air inside the motor when the rotor (50) rotates; A motor housing (10) having a cooling unit (1) formed therein, including a plurality of oil-cooling channels (110) formed on the outside of a stator (40), surrounding and coupled to the outer surface of the stator (40), formed between a coolant inlet (130) and a coolant outlet (140), and having channels radially spaced at predetermined angles from one end to the other end and from the other end to one end with respect to the axis center, and an air-cooling channel formed on the outside of the oil-cooling channel (110) and formed to surround the space between the outer surface of the oil-cooling channel (110), and guiding and cooling air flow inside the motor generated by the rotation of the rotor (50); a cover end (20) shielding one end of the motor housing (10) and having an inlet (200) for air flow generated by the rotation of the rotor blade (70); It comprises a cover housing (10) that shields the other end of the motor housing and has an outlet (300) through which air flow sucked into the inlet (200) passes through the cooling passage formed in the housing and is re-introduced into the motor;

[0012] A composite cooling system for a drive motor is provided, characterized in that the coolant circulating in the cooling channel of the motor housing cools the motor housing itself and the stator (40), and the air flowing into the inside of the motor through the air cooling channel (120) cooled by the circulation of the coolant is cooled while passing through the air cooling channel (120) and is reintroduced into the motor to cool the air inside the motor.

[0013] At this time, the cooling unit (1) is characterized in that a flow path is formed repeatedly from one end of the motor housing (10) to the other end and from the other end to one end, two or more oil-cooling flow paths are formed radially at regular intervals along the circumferential direction, and an air-cooling flow path is formed on the outside of the oil-cooling flow path and extends to the outer surface of the oil-cooling flow path and the space therebetween, and the cooling liquid circulating in the oil-cooling flow path cools the outer surface of the stator (40) in contact therewith, and the air inside the motor generated by the rotation of the rotor blade (70) passing through the air-cooling flow path cooled by the circulation of the oil-cooling flow path is introduced into the motor through the outlet (300) of the cover housing (30), thereby cooling the air inside the motor.

[0014] Meanwhile, the cover end (20) is characterized in that it is provided with a "U" cross-section, a cooling flow direction changing portion (210, 310) that connects to the ends of a pair of cooling flow paths formed by penetrating from one end to the other formed in the motor housing on the circumferential surface that comes into contact with the motor housing (10) and changes the direction of the flow path, an air cooling flow inlet (200) that is formed at predetermined intervals on the inner surface and changes and guides the direction of the air flow generated by the rotation of the rotor blade (70) to the air cooling flow path (120) formed in the motor housing (10), and an air cooling flow direction changing portion (220, 320) that changes and guides the direction of the air inside the motor that flows into the air cooling flow inlet (200) to the air cooling flow path formed in the motor housing (10).

[0015] And, in the cover housing (30), on the circumference that comes into contact with the motor housing (10), there is provided a "U" cross-section oil cooling channel direction changing portion (210, 310) that is connected to the ends of a pair of oil cooling channels formed by penetrating from one end to the other end formed in the motor housing and changes the direction of the flow.

[0016] It is characterized in that it is provided with an air cooling channel direction changer (220, 320) that changes and guides the direction of air transported through the air cooling channel formed in the above motor housing (10) into the inside of the motor, and an air cooling channel outlet (300) that is formed at predetermined intervals on the inner surface and discharges the direction of air introduced through the air cooling channel (120) direction changer into the inside of the motor.

[0017] At this time, the air flow generated by the rotation of the rotor blade (70) is introduced into the plurality of air cooling channel inlets (200), and then passes through the air cooling channel direction changer (220, 320) and is introduced into the air cooling channel formed in the motor housing (10) in a direction perpendicular to the rotation axis, and is converted to a direction parallel to the rotation axis, and the air is cooled while passing through the air cooling channel.

[0018] The cooled air is discharged to the air-cooling outlet (300) and introduced into the motor while being turned back toward the axis center through the direction changing portion formed in the cover housing (30), and the cooled air introduced into the motor cools the air inside the motor that has been heated by the heat source generated from the coil bobbin, and moves while passing through the vent hole (51) formed in the rotor (50), and cools the air inside the motor while repeating the same air flow route by the rotation of the rotor blade (70).

[0019] And, when the coolant comes into contact with the motor housing (10) and the motor housing (10) through the circulation of the coolant flow path, the stator (40) is cooled, and the air inside the motor circulating through a predetermined flow path by the rotation of the rotor blade (70) is cooled through heat exchange while circulating through the air-cooling flow path cooled by the circulation of the coolant, and the cooled air is introduced into the motor to cool the inside of the motor.

[0020] Meanwhile, the air-cooling path is characterized by being configured as a path that passes through the air-cooling path inlet formed in the cover end (20) to the air-cooling path direction changer (220, 320), passes through the air-cooling path formed in the motor housing (10), then passes through the direction changer formed in the cover housing (30) and the air-cooling path outlet (300) to enter the inside of the motor, and passes through the vent hole (51) to reach the rotor blade (70).

[0021] According to a preferred embodiment of the present invention, a compact, lightweight, and compatible electric motor composite cooling system has a structure and means for circulating internal air without bringing in air from the outside, so that an air-cooling radiator required by a conventional air-cooling method is unnecessary, enabling miniaturization and lightweighting, and an oil-cooling path and an air-cooling path are simultaneously provided in the motor housing (10), and the coolant circulating in the oil-cooling path cools the air-cooling path adjacent to the oil-cooling path, and not only additionally / compositely cools the air inside the motor circulated by the rotor blade (70) circulating in the cooled air-cooling path, but also has the advantage of being able to provide a composite cooling system having an excellent structure in terms of maintenance because the inflow of substances introduced from the outside is blocked.

[0022] Meanwhile, it is expected that it is possible to provide a dual composite cooling system in which the coolant cools the stator (40) when it comes into contact with the motor housing (10) and the motor housing (10) through the circulation of the coolant flow path, and the air inside the motor circulating through a predetermined flow path by the rotation of the rotor blade (70) is cooled through heat exchange while circulating through the air-cooling flow path cooled by the circulation of the coolant, and the cooled air is introduced into the motor to cool the inside of the motor.

[0023] Figure 1 is a drawing showing the configuration of a composite cooling system of a composite cooling system for a drive motor according to the present invention.

[0024] Fig. 2 is a drawing showing one side view of the configuration of a composite cooling system for a drive motor according to the present invention.

[0025] Figure 3 is a drawing showing the air cooling path of the composite cooling system of the present invention.

[0026] Figure 4 is a drawing showing the oil cooling path in the motor housing of the composite cooling system of the present invention.

[0027] Figure 5 is a drawing showing an air cooling path in a motor housing of the composite cooling system of the present invention.

[0028] Figure 6 is a drawing showing the configuration of the cover end of the composite cooling system of the present invention.

[0029] Figure 7 is a drawing showing the configuration of the cover housing of the composite cooling system of the present invention.

[0030] Figure 8 is a diagram showing the simulation results for air cooling and oil cooling in the composite cooling system of the present invention.

[0031] Figure 9 is a diagram showing the results of a simulation of the heat generated in the stator when a motor equipped with the composite cooling system of the present invention is driven and the motor cooling through oil cooling circulation and air cooling circulation.

[0032] Figure 10 is a drawing for explaining the configuration of the vent hole and blade formed in the rotor.

[0033] 10. Motor housing 20. Cover end

[0034] 30. Cover housing 40. Stator

[0035] 50. Rotor 60. Shaft

[0036] 70. Rotor blade 110. Oil cooling euro

[0037] 120. Air-cooled Euro 130. Coolant inlet

[0038] 140. Coolant outlet 200. Inlet

[0039] 300. Outlet 210. Oil-cooling oil direction changer

[0040] 220. Air-cooled flow path changer 310. Oil-cooled flow path changer

[0041] 320. Air-cooled oil direction changer 41. Coil bobbin

[0042] 51. Vent hole 1. Cooling section

[0043]

[0044] In order to fully understand the present invention, its operational advantages, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

[0045]

[0046] Hereinafter, the present invention will be described in detail by describing preferred embodiments thereof with reference to the attached drawings. However, the present invention may be implemented in various different forms and is not limited to the embodiments described. Furthermore, for the purpose of clearly explaining the present invention, parts irrelevant to the description are omitted, and the same reference numerals in the drawings indicate the same components.

[0047]

[0048] Hereinafter, various embodiments of this document will be described with reference to the attached drawings. However, this is not intended to limit the technology described in this document to specific embodiments, and it should be understood that various modifications, equivalents, and / or alternatives of the embodiments of this document are included. In connection with the description of the drawings, similar reference numerals may be used for similar components.

[0049] In this document, the expressions "includes," "may include," etc. indicate the presence of a feature (e.g., a number, function, operation, or component such as a part), but do not exclude the presence of additional features.

[0050]

[0051] The terms used in this document are used only to describe specific embodiments and may not be intended to limit the scope of other embodiments. The singular expression may include the plural expression unless the context clearly indicates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by those of ordinary skill in the art described in this document. Terms defined in general dictionaries among the terms used in this document may be interpreted as having the same or similar meaning in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined in this document. In some cases, even if a term is defined in this document, it cannot be interpreted to exclude the embodiments of this document.

[0052]

[0053] It goes without saying that various modifications can be made by a person skilled in the art to which the invention pertains without departing from the gist of the invention claimed in the claims of the present invention, and such modifications should not be understood individually from the technical idea or prospect of the present invention.

[0054]

[0055] FIG. 1 is a drawing showing the configuration of a composite cooling system of a drive motor composite cooling system according to the present invention. FIG. 2 is a drawing showing a side view of the configuration of a drive motor composite cooling system according to the present invention. FIG. 3 is a drawing showing an air cooling path of the composite cooling system according to the present invention. FIG. 4 is a drawing showing an oil cooling path in a motor housing of the composite cooling system according to the present invention. FIG. 5 is a drawing showing an air cooling path in a motor housing of the composite cooling system according to the present invention. FIG. 6 is a drawing showing the configuration of a cover end of the composite cooling system according to the present invention. FIG. 7 is a drawing showing the configuration of a cover housing of the composite cooling system according to the present invention. FIG. 8 is a drawing showing the simulation results for air cooling and oil cooling in the composite cooling system according to the present invention. FIG. 9 is a drawing showing the simulation results for heat generated in a stator when a motor equipped with the composite cooling system according to the present invention is driven, and motor cooling through oil cooling circulation and air cooling circulation. Figure 10 is a drawing for explaining the configuration of the vent hole and blade formed in the rotor.

[0056]

[0057] A compact, lightweight, and compatible composite cooling system for a drive motor according to a preferred embodiment of the present invention is a motor cooling system in which both an oil-cooling method and an air-cooling method are applied, and the cooling efficiency is improved by having a water-cooling method cooling path, and an air-cooling method rotor blade (70) and a vent hole (51) are provided, so that the internal air heated by the driving of the motor through the rotation of the rotor blade (70) introduced by the fan is cooled by circulating the inlet (200) provided in the bracket along the air-cooling path provided in the motor housing (10), and then the cooled air is introduced into the motor through the outlet (300) provided in the opposite bracket, and then circulated through the vent hole (51) formed in the rotor (50) while cooling the heated coil bobbin and the internal air, thereby cooling not only the rotor (50) which generates a lot of heat, but also the coil bobbin wound at the end of the stator (40) and the front of the shaft (60), thereby providing an efficient motor cooling system in which cooling is dually / complexly performed. there is.

[0058]

[0059] In addition, the compact, lightweight, and compatible electric motor composite cooling system according to a preferred embodiment of the present invention has a structure and means for circulating internal air without bringing in air from the outside, so that the air-cooling radiator required by the existing air-cooling method is unnecessary, and thus the motor housing (10) can be made compact and lightweight, and an oil-cooling passage (110) and an air-cooling passage are simultaneously provided, and the coolant circulating in the oil-cooling passage (110) cools the air-cooling passage adjacent to the oil-cooling passage (110), and not only additionally cools the air inside the motor circulated by the rotor blade (70) circulating in the cooled air-cooling passage, but also blocks the inflow of substances introduced from the outside, so that the composite cooling system can be provided with an excellent structure in terms of maintenance.

[0060]

[0061] The conventional electric motor cooling system cannot be made lighter by improving the cooling performance of the rotor (50) by extending the cooling path to the rotating shaft (60) to improve the cooling efficiency, and in order to apply a method of cooling two or more different parts (e.g., an inverter and a motor) at the same time, two or more parts are manufactured as an integrated body and applied only to specific models, thereby reducing compatibility. The present invention provides a structure that can be installed and used on an existing electric motor, and has the advantages of good compatibility and miniaturization and lightweighting by changing the structure of the parts that make up the existing motor.

[0062]

[0063] Below, the configuration of a composite cooling system for a drive motor according to a preferred embodiment of the present invention will be examined in detail.

[0064]

[0065] Referring to FIGS. 1 to 7, a composite cooling system for a drive motor according to a preferred embodiment of the present invention is configured to include a stator (40), a rotor (50), a shaft (60), a cooling unit (1), a motor housing (10), and a bracket (in the present invention, the terms cover housing and cover end are used interchangeably).

[0066]

[0067] The above stator (40) is configured by stacking a plurality of iron plates having a predetermined thickness, and a plurality of coils are wound in a slot portion where the wound coils are seated, and when power is applied, a magnetic flux is generated to rotate the rotor (50) by the induction motor power.

[0068]

[0069] The rotor (50) is mounted on the inside of the stator (40). Meanwhile, the shaft (60) is inserted into the inside of the rotor (50) and rotates around the rotation axis.

[0070]

[0071] The cooling unit (1) is mounted on the outside of the stator (40), is provided in the motor housing (10) that surrounds and is coupled to the outside surface of the stator (40), and cools all components including the core part of the stator (40), the wound coil winding, the rotor (50), and the shaft (60).

[0072]

[0073] The above cooling unit (1) has a structure in which both oil-cooling and air-cooling methods are applied, and the oil-cooling path (110) flowing by the oil-cooling method and the air-cooling path circulating by the air-cooling method are implemented as independent structures.

[0074]

[0075] The above-mentioned oil cooling passage (110) is provided in the motor housing (10) and is formed radially in multiple numbers on the inner side of the motor housing (10) relatively adjacent to the stator (40). Meanwhile, the air cooling passage is also formed within the motor housing (10) and is formed in a structure that surrounds the outer surface of the oil cooling passage (110).

[0076]

[0077] With the above structure, when the coolant circulates through the cooling channel (110), it directly cools the motor housing (10) and the stator (40) in contact with the motor housing (10).

[0078]

[0079] Meanwhile, the circulation of air inside the motor caused by the rotation of the rotor blade (70) provided on one side of the rotor (50) is cooled through the air cooling path formed in the motor housing (10) inside the motor, and then flows back into the motor, and the cooled air that flows into the motor moves to the vent hole (51) formed in the rotor (50) and then returns to the origin, thereby forming an entire air cooling path that cools the components inside the motor by repeating the same route.

[0080]

[0081] A composite cooling system for a drive motor according to an embodiment of the present invention comprises: a stator (40) forming a rotor (50) system; a rotor (50) provided inside the stator (40) and rotating around a rotation axis; a shaft (60) inserted inside the rotor (50) and rotating around the rotation axis; a plurality of rotor blades (70) provided at one end of the rotor (50) at predetermined radial positions with respect to the rotation axis and generating a flow of air inside the motor when the rotor (50) rotates; A motor housing (10) having a cooling unit (1) formed therein, including a plurality of oil-cooling channels (110) formed on the outside of a stator (40), surrounding and coupled to the outer surface of the stator (40), formed between a coolant inlet (130) and a coolant outlet (140), and having channels radially spaced apart at predetermined angles from one end to the other end and from the other end to one end with respect to the axis center, and an air-cooling channel formed on the outside of the oil-cooling channels (110) and formed to surround the outer surface of the oil-cooling channels (110), formed to surround a space between the oil-cooling channels (110) and the oil-cooling channels (110), and guiding and cooling air flow inside the motor generated by rotation of the rotor (50); a cover end (20) which shields one end of the motor housing (10) and has an inlet (200) for air flow generated by rotation of the rotor blades (70); It comprises a cover housing (10) that shields the other end of the motor housing and has an outlet (300) through which air flow sucked into the inlet (200) passes through an air cooling passage formed in the housing and is reintroduced into the motor.

[0082]

[0083] A predetermined space is formed between the stator (40) and the rotor (50) to provide a space that ensures smooth rotation of the rotor (50) by the induced electromotive force generated when power is supplied to the stator (40). This is called an air gap.

[0084]

[0085] Meanwhile, a rotor blade (70) is provided at one end of the rotor (50).

[0086]

[0087] The above rotor blades (70) are provided in multiple numbers at predetermined radial positions with respect to the rotation axis, and generate a flow of air inside the motor when the rotor (50) rotates. The flow of air generated by the rotor blades (70) moves to the air cooling passage (120) formed in the motor housing (10) through the passage formed in the cover end (20) described later.

[0088]

[0089] The above rotor blade (70) is provided with blades having a cross-sectional shape of a predetermined polygon at predetermined angles around the rotation axis. The above rotor blade (70) may be provided as an integral part of the rotor (50), or may be manufactured as a separate component and provided in a detachable manner.

[0090]

[0091] Meanwhile, a motor housing (10) is provided on the outer surface of the stator (40).

[0092]

[0093] The above motor housing has a cylindrical structure with a predetermined thickness. An oil-cooling passage (110) is formed on the inner surface of a body with a predetermined thickness constituting the motor housing (10), and an air-cooling passage is formed on the outer surface of the oil-cooling passage (110).

[0094]

[0095] The above-mentioned cooling channel (110) has a pipe structure connected between the cooling liquid inlet (130) and the cooling liquid outlet (140).

[0096]

[0097] In detail, it is formed between the coolant inlet (130) and the coolant outlet (140), and the flow path is formed radially at a predetermined distance from one end to the other end and from the other end to one end of the motor housing (10).

[0098]

[0099] Meanwhile, the air-cooling channel is formed on the outside of the oil-cooling channel (110), is formed to surround the outer surface of the oil-cooling channel (110), and is formed to extend to the space between the oil-cooling channels (110).

[0100]

[0101] The above air-cooling path guides the air flow inside the motor, which is generated by the rotation of the rotor (50), to move from one end of the motor to the other, and the air transported inside the motor is cooled by passing through the air-cooling path cooled by the cooling action of the oil-cooling path (110) and is cooled by contact with the internal pipe of the air-cooling path.

[0102]

[0103] The cooled air passing through the above-mentioned cooling passage is re-introduced into the motor through the outlet (300) provided in the cover housing (30). The cooled air re-introduced into the motor passes through the vent hole (51) and moves to the other end, cooling the outer surface of the wound coil bobbin (41), the stator (40), and the rotor (50).

[0104]

[0105] Afterwards, a system is configured to cool the air inside the motor by repeatedly moving the air cooling path through the inlet (200) formed in the cover end (20) by rotating the rotor blade (70) again.

[0106]

[0107] With the above configuration, the cooling liquid circulating through the oil-cooling passage (110) of the motor housing cools the motor housing itself and the stator (40), and the air flowing into the inside of the motor circulating through the air-cooling passage (120) cooled by the circulation of the cooling liquid is cooled while passing through the air-cooling passage (120) and is reintroduced into the motor to cool the air inside the motor.

[0108]

[0109] Meanwhile, the cooling unit (1) is formed by repeatedly forming a flow path from one end of the motor housing (10) to the other end and from the other end to one end, and two or more of the oil cooling flow paths (110) are formed radially at regular intervals along the circumferential direction.

[0110]

[0111] In addition, an air-cooling channel is provided that is formed on the outside of the oil-cooling channel (110), is formed to surround the outer surface of the oil-cooling channel (110), and extends to the outer surface of the oil-cooling channel (110) and the space therebetween.

[0112]

[0113] Through the above structure, the cooling liquid circulating through the cooling channel (110) cools the motor housing (10) and the stator (40) in contact therewith.

[0114]

[0115] At this time, the air inside the motor, which flows through the cooled air-cooling channel and is cooled by the rotation of the rotor blade (70) through heat exchange with the inner wall of the air-cooling channel, flows into the motor through the outlet (300) of the cover housing (30), and cools the inside of the motor, the wound coil bobbin (41), the stator (40), and the rotor (50) that come into contact with it.

[0116]

[0117] Meanwhile, the cover end (20) is provided with a "U" cross-section oil cooling channel direction changing portion (210, 310) that connects to the ends of a pair of oil cooling channels (110) formed by penetrating from one end to the other end of the motor housing and changes the direction of the channels on the circumferential surface that comes into contact with the motor housing (10).

[0118]

[0119] In addition, a plurality of air cooling channel inlets (200) are formed at predetermined intervals on one inner side of the cover end (20) and are provided to change the direction of air flow generated by the rotation of the rotor blade (70) and guide it to the air cooling channel (120) formed in the motor housing (10).

[0120]

[0121] In addition, an air-cooling path direction change unit (220, 320) is provided to change the direction of air inside the motor, which is introduced into the air-cooling path inlet (200), by approximately 90 degrees and guide it into the air-cooling path formed in the motor housing (10).

[0122]

[0123] Meanwhile, the air-cooling inlet (200) and the air-cooling direction changing unit (220, 320) may be provided as a single unit, and may be collectively referred to as the air-cooling inlet (200). The air-cooling inlet (200) and the air-cooling direction changing unit (220, 320) correspond to a configuration that performs the role of an inlet and a guide for guiding the flow of internal air generated by the rotation of the rotor blade (70) to the air-cooling direction formed in the motor housing (10), and represents the function of the inlet and the configuration for changing the direction, and it is also possible to integrate and refer to them as a single configuration.

[0124]

[0125] Meanwhile, the cover housing (30) is provided with a "U" cross-section oil cooling channel direction changing portion (210, 310) that connects to the ends of a pair of oil cooling channels (110) formed by penetrating from one end to the other end of the motor housing and changes the direction of the channels, on the circumference that comes into contact with the motor housing (10).

[0126]

[0127] This is a configuration that performs the same function as the oil cooling oil direction change unit (210, 310) in the above cover end (20).

[0128]

[0129] In addition, an air cooling channel direction changer (220, 320) that changes and guides the direction of air transported through the air cooling channel formed in the motor housing (10) into the inside of the motor, and an air cooling channel outlet (300) that is formed at predetermined intervals on the inner surface and discharges the direction of air introduced through the air cooling channel (120) direction changer into the inside of the motor are provided.

[0130]

[0131] This has the same configuration as the air-cooling flow direction changer (220, 320) and air-cooling flow inlet (200) described in the cover housing (30) above, but in terms of function, it is a configuration that changes the direction of cooled air passing through the air-cooling flow path provided in the motor housing (10) to flow back into the motor, and then functions as an outlet.

[0132]

[0133] In addition, the air-cooling outlet (300) and the air-cooling direction changing unit (220, 320) may be provided as a single unit, and may be collectively referred to as the air-cooling outlet (300). The air-cooling outlet (300) and the air-cooling direction changing unit (220, 320) correspond to a configuration that performs the role of a direction changing unit and an outlet for guiding the flow of air that has been cooled while undergoing heat exchange while passing through the air-cooling channel of the motor housing (10) into the inside of the motor, and shows the function of the outlet and the configuration for changing the direction, and it is also possible to integrate and refer to them as a single configuration.

[0134]

[0135] Due to the configuration described above, the coolant injected into the coolant inlet (130) provided in the motor housing (10) circulates in the oil cooling passage (110) and cools the motor housing (10) and the stator (40) in contact with the motor housing (10) through heat exchange.

[0136]

[0137] Meanwhile, the air inside the motor, which circulates through a predetermined path by the rotation of the rotor blade (70), is cooled through heat exchange while circulating through the air-cooling path cooled by the circulation of the cooling liquid, and the air cooled in this way is introduced into the motor to cool the components provided inside the motor, such as the stator (40), the wound coil bobbin (41), and the rotor (50).

[0138]

[0139] Looking at the process of cooling the air inside the motor generated by the motor's operation when power is supplied to the stator (40) inside the motor, the air flow generated by the rotation of the rotor blades (70) flows into the plurality of air cooling channel inlets (200), and then passes through the air cooling channel direction changing portions (220, 320) and changes direction from the direction perpendicular to the rotation axis to the air cooling channel formed in the motor housing (10), and proceeds while changing direction parallel to the rotation axis, and while passing through the air cooling channel, cooling of the air passing through the air cooling channel that has been cooled through the oil cooling process is performed.

[0140]

[0141] Afterwards, the air is turned back toward the center of the shaft through the direction changing portion formed in the cover housing (30) and discharged to the air-cooling outlet (300) to be introduced into the motor, and the cooled air introduced into the motor cools the air inside the motor that has become hot by the heat source generated from the coil bobbin.

[0142]

[0143] Next, a system is configured to cool the air inside the motor by moving through the vent hole (51) formed in the rotor (50) and repeating the same air flow route by rotating the rotor blade (70).

[0144]

[0145] Meanwhile, the flow of air inside the motor is generated by the rotation of the rotor blades, passes through the air cooling path through the inlet formed in the cover end, flows back into the motor through the outlet formed in the cover housing, and then passes through the vent hole (51) to take a path to circulate toward the rotor blades, as shown in one example of the present invention.

[0146]

[0147] Meanwhile, the flow of air circulating inside the motor flows mainly through the vent hole, but some of it may also flow through the air gap.

[0148]

[0149] Meanwhile, the air flow inside the motor can also flow in a path opposite to the previously described example.

[0150]

[0151] That is, it is also sufficiently predictable as another embodiment of the present invention that the air generated from the rotor blade is introduced into an outlet formed in the cover housing, passes through an air cooling path formed in the housing, and then is introduced back into the motor through an inlet formed in the cover end, and the introduced air then flows back toward the rotor blade through the vent hole and air gap.

[0152]

[0153] Looking at FIGS. 8 and 9, the simulation results for air cooling and oil cooling in the composite cooling system of the present invention are shown, and the blue part shows that circulation for cooling is performed through the oil cooling path, and the yellow part shows that the air inside the motor flows through the air cooling path due to the rotation of the blades according to the operation of the motor.

[0154]

[0155] Through the above-mentioned oil cooling, direct cooling is provided to the housing, stator, and air-cooling passage, and when the air inside the motor circulates through the cooled air-cooling passage, the inside of the motor is additionally cooled by the secondarily cooled air.

[0156]

[0157] In Fig. 9, it can be confirmed that heat is generated in the stator section due to the operation of the motor, and that the internal components of the motor and the internal air are effectively cooled through a combination of oil cooling and air cooling.

[0158]

[0159] In the composite cooling system of the oil-cooling cooling system and the air-cooling cooling system provided in the composite cooling system for the drive motor according to the present invention, although the oil-cooling cooling system and the air-cooling cooling system are provided and operate separately, the cooling system by oil-cooling cools the air-cooling passage, which is a component of the air-cooling, and the heated air inside the motor passing through the air-cooling passage (120) thus cooled cools the inside of the motor without the introduction of external air into the motor through heat exchange with the air-cooling passage, thereby providing a system in which each cooling system comprehensively affects the cooling system.

Claims

1. A stator (40) forming a rotor (50) system; A rotor (50) provided on the inside of a stator (40), rotates around a rotation axis, and has a plurality of vent holes (51) formed radially at a predetermined radius position from the rotation axis; A shaft (60) that is inserted and rotates around the rotation axis inside the rotor (50); A plurality of rotor blades (70) are provided at predetermined radial positions with respect to the rotation axis at one end of the rotor (50) and generate a flow of air inside the motor when the rotor (50) rotates; A motor housing (10) having a cooling unit (1) formed therein, including a plurality of oil-cooling channels (110) provided on the outside of a stator (40), coupled to surround the outer surface of the stator (40), formed between a coolant inlet (130) and a coolant outlet (140), and having channels radially spaced at predetermined angles from one end to the other and from the other end to one end with respect to the axis center, and an air-cooling channel formed on the outside of the oil-cooling channel (110) and formed to surround the space between the outer surface of the oil-cooling channel (110), and guiding and cooling the air flow inside the motor generated by the rotation of the rotor (50); A cover end (20) that shields one end of the motor housing (10) and has an inlet (200) for air flow generated by the rotation of the rotor blade (70); It comprises a cover housing (10) that shields the other end of the motor housing and has an outlet (300) through which air flow sucked into the inlet (200) passes through the cooling passage formed in the housing and is re-introduced into the motor; A composite cooling system for a drive motor, characterized in that the coolant circulating through the oil-cooling passage (110) of the motor housing cools the motor housing itself and the stator (40), and the air flowing into the motor through the air-cooling passage (120) cooled by the circulation of the coolant is cooled while passing through the air-cooling passage (120) and is reintroduced into the motor to cool the air inside the motor.

2. In paragraph 1, The above cooling unit (1) is, A flow path is formed by repeating from one end to the other end of the above motor housing (10), and two or more of the above cooling flow paths (110) are formed radially at regular intervals along the circumferential direction. It includes an air-cooling channel formed on the outside of the above-mentioned oil-cooling channel (110) and extending to the outer surface of the above-mentioned oil-cooling channel (110) and the space therebetween. A composite cooling system for a drive motor, characterized in that the cooling liquid circulating through the oil-cooling passage (110) cools the outer surface of the motor housing (10) and the stator (40) in contact therewith, and the air inside the motor generated by the rotation of the rotor blade (70) passing through the air-cooling passage cooled by the circulation of the oil-cooling passage (110) is introduced into the motor through the outlet (300) of the cover housing (30), thereby cooling the air inside the motor.

3. In paragraph 1, At the above cover end (20), On the circumference that comes into contact with the above motor housing (10), there is provided a "U" cross-section oil cooling channel direction changing portion (210, 310) that connects to the ends of a pair of oil cooling channels (110) formed by penetrating from one end to the other end formed in the motor housing and changes the direction of the channels. An air-cooling inlet (200) formed at predetermined intervals on the inner surface and guiding and diverting the air flow generated by the rotation of the rotor blade (70) to the air-cooling channel (120) formed in the motor housing (10). A composite cooling system for a drive motor characterized in that it is provided with an air-cooling flow direction changing unit (220, 320) that changes and guides the air inside the motor flowing into the air-cooling flow inlet (200) to the air-cooling flow path formed in the motor housing (10).

4. In paragraph 1, In the above cover housing (30), On the circumference that comes into contact with the above motor housing (10), there is provided a "U" cross-section oil cooling channel direction changing portion (210, 310) that connects to the ends of a pair of oil cooling channels (110) formed by penetrating from one end to the other end formed in the motor housing and changes the direction of the channels. An air cooling path direction changer (220, 320) that changes and guides the direction of air transported through the air cooling path formed in the above motor housing (10) into the inside of the motor. A composite cooling system for a drive motor characterized in that it is provided with an air-cooling outlet (300) formed at a predetermined interval on the inner surface and discharging the direction of air flowing in through the air-cooling channel (120) direction change part into the inside of the motor.

5. In paragraphs 3 and 4, The air flow generated by the rotation of the rotor blade (70) is introduced into the plurality of air cooling channel inlets (200), and then passes through the air cooling channel direction changer (220, 320) and is introduced into the air cooling channel formed in the motor housing (10) in a direction perpendicular to the rotation axis, and is converted to a direction parallel to the rotation axis, and the air is cooled while passing through the air cooling channel. A composite cooling system for a drive motor characterized in that the cooled air flows into the motor by being discharged to the air-cooling outlet (300) while being turned back toward the axis center through the direction changing portion formed in the cover housing (30), and the cooled air flowing into the motor cools the air inside the motor that has been heated by the heat source generated from the coil bobbin, and moves while passing through the vent hole (51) formed in the rotor (50), and then moves by repeating the same air flow route by the rotation of the rotor blade (70), thereby cooling the air inside the motor.

6. In paragraph 5, A composite cooling system for a drive motor, characterized in that when the coolant comes into contact with the motor housing (10) and the motor housing (10) through the circulation of the oil-cooling passage (110), the stator (40) is cooled, and the air inside the motor circulating through a predetermined passage by the rotation of the rotor blade (70) is cooled through heat exchange while circulating through the air-cooling passage cooled by the circulation of the coolant, and the cooled air is introduced into the motor to cool the inside of the motor.

7. In paragraph 6, With the above air-cooled oil, A composite cooling system for a drive motor characterized by comprising a flow path that passes through an air-cooling flow inlet formed in the cover end (20) to an air-cooling flow direction changer (220, 320), passes through an air-cooling flow path formed in the motor housing (10), then flows into the inside of the motor through a direction changer and an air-cooling flow outlet (300) formed in the cover housing (30), and passes through a vent hole (51) to reach a rotor blade (70).

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