Complex cooling system for driving motor

Abstract

The present invention relates to a complex cooling system for a driving motor. The system has a structure and a means for circulating internal air without introducing air from the outside, does not require an air cooling radiator needed for a conventional air cooling method, and thus allows for miniaturization and weight reduction. An oil cooling flow path and an air cooling flow path are simultaneously provided in a motor housing such that a cooling liquid circulating through the oil cooling flow path cools the air cooling flow path adjacent to the oil cooling flow path. The air inside the motor, which is circulated by a rotor blade through the cooled air cooling flow path, is also cooled in a complex manner. In addition, the structure blocks the inflow of foreign substances and thus is excellent in terms of maintenance.

Description

Drive motor composite cooling system

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

[0002] Recently, due to the demand for improved fuel efficiency and reduced exhaust gas in vehicles, the spread of electric vehicles (including EVs: Electric Vehicles and HEVs: Hybrid Electric Vehicles) is rapidly progressing.

[0003] In recent years, motors have become increasingly used as propulsion systems in electric vehicles, including electric and hybrid vehicles. These vehicles primarily utilize batteries and motors as their power sources.

[0004] A motor is a power machine that receives power from a battery, rotates, and generates rotational force on the motor shaft. It is a device that converts electrical energy into mechanical energy.

[0005] Typically, a motor consists of a housing, a stator, a rotor, and a rotating shaft. When the motor starts operating, power is applied to the stator, and the magnetic field formed by the stator coils interacts with the magnetic field of the rotor, causing the rotor to rotate around the rotating shaft.

[0006] When such a motor is driven, the stator coil generates heat due to electrical resistance, causing its temperature to rise, thus causing the overall temperature inside the housing to rise. If the temperature inside the housing rises, the electrical resistance of the stator coil may increase, reducing output. Furthermore, the forced deterioration of the driving components may be accelerated, potentially shortening their lifespan.

[0007] Considering these issues, air cooling is commonly used, which cools motors by forcing air through them. However, this method has limitations in cooling the motor due to the low specific heat capacity of air.

[0008] Conventional Japanese Patent Publication No. JP2013-039012A attempted to address this issue by providing a structure for supplying cooling oil to the end turns of the stator coil. However, in such conventional motors, cooling oil falls toward the end turns of the stator coil, making it difficult to cool the interior of the stator core and the rotor.

[0009] In addition, Japanese registered patent JP5678561B9 discloses a structure in which the coil end and the motor cover are sealed with an O-ring and then oil is circulated.

[0010] These conventional motors have a molding structure that surrounds the ends of the coils, but the thermal conductivity is reduced during molding, so the temperature of the coil is expected to rise, and refrigerant leakage may occur.

[0011] Therefore, a solution is needed to more effectively cool the heat generated in the coil without affecting the leakage and power loss of the rotating part.

[0012] Prior art literature

[0013] Patent documents

[0014] (Patent Document 0001) Japanese Patent Publication No. JP2013-039012A

[0015] (Patent Document 0002) Japanese Registered Patent JP5678561B

[0016] The purpose of an embodiment of the present invention is to provide a configuration of a drive motor 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 circulation of the oil-cooling path, the air inside the motor circulating through a predetermined path by rotation of the rotor blade (70) is cooled through heat exchange while circulating through the air-cooling path cooled by the circulation of the coolant, and the cooled air is introduced into the motor to doubly cool the inside of the motor.

[0017] In addition, another object of the present invention is to provide a configuration of a dual-drive motor composite cooling system in which the cooling efficiency of the air-cooling system is directly proportional to the cooling efficiency of the fluid cooling system, thereby improving the cooling efficiency.

[0018] 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); In a driving motor comprising 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 re-introduced into the motor;

[0019] The present invention provides a driving motor composite cooling system, which comprises a fluid cooling system in which the coolant injected into the coolant inlet (130) circulates through a fluid cooling path formed in the motor housing (10) and cools the motor housing (10) and the stator (40) to a predetermined temperature; and an air cooling system in which the air flow generated inside the motor by the rotation of the rotor blade (70) passes through an inlet (200) formed in the cover end (20), an air cooling path formed in the motor housing, an outlet (300) formed in the cover housing (30), and a vent hole (51) formed in the rotor (50), and the air cooling system is provided on the outside of the fluid cooling system, and the air cooling system is characterized in that it is cooled in a composite manner by circulating through the air cooling path of the motor housing (10) cooled by the circulation of the coolant of the fluid cooling system.

[0020]

[0021] At this time, the cooling unit (1) is configured such that a flow path is repeatedly formed 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 between them, and the cooling efficiency of the air-cooling cooling system is characterized in that it is proportional to the cooling efficiency of the fluid cooling system.

[0022]

[0023] And, the cooling unit (1) is configured such that a flow path is repeatedly formed from one end of the motor housing (10) to the other end and from the other end to one end, and two or more oil cooling flow paths are formed radially at regular intervals along the circumference of the motor housing (10), 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 fluid cooling system is characterized in that an air cooling system is provided in which a cooling liquid circulates through the oil cooling flow path to cool the motor housing (10) and the stator (40), and cooled air circulated through the air cooling flow path cooled by the fluid cooling system is introduced into the motor to cool the air inside the motor.

[0024]

[0025] 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 formed by penetrating from one end to the other end of the motor housing on the circumference that comes into contact with the motor housing (10) and changes the direction of the flow path, and an air cooling channel outlet (300) that is formed at predetermined intervals on the inner surface and guides the direction of air flowing in through the end of the air cooling channel (120) into the inside of the motor, and the circulation of the cooling liquid of the fluid cooling system is characterized in that the cooling liquid advances from one end to the other end of the oil cooling channel formed in the motor housing (10), and then advances from the other end to one end again while passing through the oil cooling channel direction changing portion (210, 310).

[0026]

[0027] In addition, the air cooling system is such that the air flow generated by the rotation of the rotor blade (70) inside the motor flows into the air cooling path inlet (200), circulates along the air cooling path formed in the motor housing (10), and cools the air through heat exchange while passing through the air cooling path cooled by the fluid cooling system.

[0028] The cooled air is introduced into the motor through the above-mentioned air-cooling outlet (300), and the cooled air introduced into the motor cools the air inside the motor heated by the heat source generated from the coil bobbin, passes through the vent hole (51) formed in the rotor (50), and then returns to the origin and moves along the same path repeatedly, thereby cooling the air inside the motor.

[0029] 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.

[0030]

[0031] Meanwhile, it is expected that the effect of providing 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 can be expected.

[0032] 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.

[0033] 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.

[0034] Figure 3 is a drawing showing the air cooling path of the composite cooling system of the present invention.

[0035] Figure 4 is a drawing showing the oil cooling path in the motor housing of the composite cooling system of the present invention.

[0036] Figure 5 is a drawing showing an air cooling path in a motor housing of the composite cooling system of the present invention.

[0037] Figure 6 is a drawing showing the configuration of the cover end of the composite cooling system of the present invention.

[0038] Figure 7 is a drawing showing the configuration of the cover housing of the composite cooling system of the present invention.

[0039] Figure 8 is a diagram showing the simulation results for air cooling and oil cooling in the composite cooling system of the present invention.

[0040] Figure 9 is a diagram showing the results of a simulation of heat generated in a stator when a motor equipped with a composite cooling system according to the present invention is driven and motor cooling through oil cooling circulation and air cooling circulation.

[0041] Figure 10 is a drawing for explaining the configuration of the vent hole and blade formed in the rotor.

[0042] Figure 11 is a comparative table of thermal and flow simulations before and after applying the configuration of the composite cooling system of the present invention.

[0043] 10. Motor housing 20. Cover end

[0044] 30. Cover housing 40. Stator

[0045] 50. Rotor 60. Shaft

[0046] 70. Rotor blade 110. Oil cooling euro

[0047] 120. Air-cooled Euro 130. Coolant inlet

[0048] 140. Coolant outlet 200. Inlet

[0049] 300. Outlet 210. Oil-cooling oil direction changer

[0050] 220. Air-cooled flow path changer 310. Oil-cooled flow path changer

[0051] 320. Air-cooled oil direction changer 41. Coil bobbin

[0052] 51. Vent hole 1. Cooling section

[0053]

[0054] 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.

[0055]

[0056] 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 described embodiments. 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.

[0057]

[0058] 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.

[0059]

[0060] 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.

[0061]

[0062] 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.

[0063]

[0064] 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.

[0065]

[0066] 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 holes and blades formed in the rotor. Figure 11 is a comparative table of thermal and flow simulations before and after applying the configuration of the composite cooling system of the present invention.

[0067]

[0068] A compact, lightweight, and compatible drive motor composite cooling system according to a preferred embodiment of the present invention is an electric motor cooling system that simultaneously applies an oil-cooling method and an air-cooling method, and improves cooling efficiency by having a water-cooling method cooling path, and has an air-cooling method rotor blade (70) and a vent hole (51), 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 along the air-cooling path provided in the motor housing (10) through the inlet (200) provided in the bracket, and then the cooled air is introduced into the motor through the outlet (300) provided in the opposite bracket, and then cools the heated coil bobbin and the internal air while circulating through the path formed in the vent hole (51) formed in the rotor (50), thereby cooling not only the rotor (50) that 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 that doubles / complexly cools. Can provide.

[0069]

[0070] 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 miniaturization and lightweight are possible, 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 cools the air inside the motor circulated by the rotor blade (70) circulating in the cooled air-cooling path, but also blocks the inflow of substances introduced from the outside, so that a composite cooling system having an excellent structure in terms of maintenance can be provided.

[0071]

[0072] 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, resulting in poor compatibility. The present invention provides a structure that can be mounted 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.

[0073]

[0074] Below, the configuration of a drive motor composite cooling system according to a preferred embodiment of the present invention will be examined in detail.

[0075]

[0076] Referring to FIGS. 1 to 8, a drive motor composite cooling system 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).

[0077]

[0078] 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.

[0079]

[0080] 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.

[0081]

[0082] 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).

[0083]

[0084] The above cooling unit (1) has a structure in which both oil-cooling and air-cooling methods are applied, and the oil-cooling path flowing by the oil-cooling method and the air-cooling path circulating by the air-cooling method are implemented as independent structures.

[0085]

[0086] The above-mentioned oil cooling channels are provided in the motor housing (10) and are formed radially in multiple numbers on the inner side of the motor housing (10) relatively adjacent to the stator (40). Meanwhile, the air cooling channels are also formed within the motor housing (10) and are formed in a structure that surrounds the outer surface of the oil cooling channels.

[0087]

[0088] With the above structure, when the coolant circulates through the cooling oil, it directly cools the motor housing (10) and the stator (40) in contact with the motor housing (10).

[0089]

[0090] In detail, a fluid cooling system is provided in which the coolant injected into the coolant inlet (130) circulates through the cooling fluid path formed in the motor housing (10) and cools the motor housing (10) and the stator (40) to a predetermined temperature.

[0091]

[0092] And, an air cooling system is provided in which the air flow generated inside the motor by the rotation of the rotor blade (70) passes through an inlet (200) formed in the cover end (20), an air cooling channel formed in the motor housing, an outlet (300) formed in the cover housing (30), and a vent hole (51) formed in the rotor (50).

[0093]

[0094] The above air-cooling system is provided on the outside of the fluid cooling system, and the air-cooling system has a configuration in which the air-cooling system is cooled in a complex manner by circulating the air-cooling path of the motor housing (10) cooled by the circulation of the cooling liquid of the fluid cooling system.

[0095]

[0096] The cooling efficiency of the air-cooling system is proportional to the cooling efficiency of the fluid cooling system. Specifically, the cooling efficiency of the air-cooling system is achieved by circulating the air-cooling channel and contacting the cooled inner surface of the air-cooling channel, thereby cooling the air-cooling channel through heat exchange. The cooling efficiency of the fluid cooling system is dependent on the cooling efficiency of the air-cooling channel.

[0097]

[0098] That is, depending on the type of cooling fluid used or the temperature of the cooling liquid injected, the cooling efficiency of the fluid cooling system is determined, and depending on the cooling efficiency of the fluid cooling system, the cooling degree of the air cooling channel changes, and the cooling efficiency of the air moving through the air cooling channel also changes.

[0099]

[0100] 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 through the path formed in the vent hole (51) formed in the rotor (50) and then returns to the origin, thereby repeating the same route to form an entire air cooling path that cools the components provided inside the motor.

[0101]

[0102] A driving motor composite cooling system 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, comprising: 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), wherein the channels are formed radially 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), formed to surround the outer surface of the oil-cooling channel (110), formed to surround a space between the oil-cooling channels, 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 an air cooling passage formed in the housing and is reintroduced into the motor.

[0103]

[0104] 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 space is referred to as an air gap.

[0105]

[0106] Meanwhile, a rotor blade (70) is provided at one end of the rotor (50).

[0107]

[0108] The above rotor blades (70) are provided in multiple numbers at predetermined radial positions relative 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.

[0109]

[0110] 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.

[0111]

[0112] Meanwhile, a motor housing (10) is provided on the outer surface of the stator (40).

[0113]

[0114] The above motor housing has a cylindrical structure with a predetermined thickness. An oil cooling channel is formed on the inner surface of the body with a predetermined thickness constituting the motor housing (10), and an air cooling channel is formed on the outer surface of the oil cooling channel.

[0115]

[0116] The above-mentioned cooling oil has a pipe structure connected between the cooling liquid inlet (130) and the cooling liquid outlet (140).

[0117]

[0118] 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).

[0119]

[0120] 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.

[0121]

[0122] 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 while passing through the air-cooling path cooled by the cooling action of the oil-cooling path is cooled by coming into contact with the internal pipe of the air-cooling path.

[0123]

[0124] 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 motor components such as the wound coil bobbin (41), the stator (40), and the rotor (50).

[0125]

[0126] 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.

[0127]

[0128] With the above configuration, the cooling liquid 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 cooling liquid is cooled while passing through the air cooling channel (120) and is reintroduced into the motor to cool the components inside the motor.

[0129]

[0130] Meanwhile, the cooling unit (1) is formed by repeatedly flowing from one end of the motor housing (10) to the other end and from the other end to one end, and two or more cooling channels are formed radially at regular intervals along the circumferential direction.

[0131]

[0132] And, an air-cooling channel is provided that is formed on the outside of the oil-cooling channel, is formed to surround the outer surface of the oil-cooling channel, and extends to the outer surface of the oil-cooling channel and the space therebetween.

[0133]

[0134] Through the above structure, the cooling liquid circulating through the cooling channel cools the motor housing (10) and the stator (40) in contact therewith.

[0135]

[0136] 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.

[0137]

[0138] The above fluid cooling system is configured as a composite cooling system including an air cooling system in which a coolant circulates through the fluid cooling path to cool the motor housing (10) and the stator (40), and cooled air circulated through the air cooling path cooled by the fluid cooling system is introduced into the motor to cool the internal components of the motor.

[0139]

[0140] Meanwhile, the cover end (20) is provided with an air-cooling flow direction changing portion (220, 320) having a "U" cross section that connects to the end of a pair of oil-cooling flow paths formed by penetrating from one end to the other end of the motor housing and changes the direction of the flow path on the circumferential surface that comes into contact with the motor housing (10).

[0141]

[0142] 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).

[0143]

[0144] 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).

[0145]

[0146] 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.

[0147]

[0148] Meanwhile, the cover housing (30) is provided with a "U" cross-section coolant flow direction changing portion (210, 310) that connects to the ends of a pair of coolant flow paths formed by penetrating from one end to the other end of the motor housing and changes the direction of the flow path on the circumferential surface that comes into contact with the motor housing (10).

[0149]

[0150] 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).

[0151]

[0152] 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 direction changer into the inside of the motor are provided.

[0153]

[0154] 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.

[0155]

[0156] 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.

[0157]

[0158] Due to the configuration described above, the coolant injected into the coolant inlet (130) provided in the motor housing (10) cools the motor housing (10) and the stator (40) in contact with the motor housing (10) through heat exchange while circulating in the cooling oil.

[0159]

[0160] 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).

[0161]

[0162] 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 to be 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.

[0163]

[0164] That is, the circulation of the cooling liquid of the fluid cooling system proceeds from one end to the other end through the cooling liquid path formed in the motor housing (10), and then passes through the cooling liquid path direction change unit (210, 310) and repeats the process of proceeding from the other end to the first end again, thereby forming a composite cooling system.

[0165]

[0166] Afterwards, the air is discharged to the cooling oil outlet (300) and flows 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 flowing into the motor cools the components of the motor that are heated by the heat source generated from the coil bobbin.

[0167]

[0168] 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).

[0169]

[0170] That is, in the air-cooling system, the air flow generated by the rotation of the rotor blade (70) inside the motor is introduced into the air-cooling inlet (200), circulates along the air-cooling passage formed in the motor housing (10), and cools the air through heat exchange while passing through the air-cooling passage cooled by the fluid cooling system.

[0171]

[0172] The cooled air flows into the motor through the above-mentioned air-cooling outlet (300), and the cooled air flowing into the motor cools the air inside the motor that is heated by the heat source generated from the coil bobbin, passes through the vent hole (51) formed in the rotor (50), and then returns to the origin and repeats the same path while cooling the components inside the motor.

[0173]

[0174] 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.

[0175]

[0176] 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.

[0177]

[0178] 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.

[0179]

[0180] 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.

[0181]

[0182] 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.

[0183]

[0184] Meanwhile, the air flow inside the motor can also flow in a path opposite to the previously described example.

[0185]

[0186] 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.

[0187]

[0188] Referring to FIG. 11, FIG. 11 numerically illustrates the results of a comparative simulation conducted before and after application of each component according to the application of a drive motor composite cooling system according to an embodiment of the present invention.

[0189]

[0190] For example, G.CASE 1 is a simulation result table for a test conducted with the same coil specifications, but without the air-cooling system among the composite cooling systems and without the rotor blades applied. G.CASE 2 is a simulation result for a test conducted with the air-cooling system and the initial rotor blades applied, and G.CASE 3 is a simulation result for a test conducted with both the air-cooling system and the improved rotor blades applied.

[0191]

[0192] In the case of G.CASE 1, the temperature of the magnet rises to 179.6 degrees when the rotation speed (RPM) is increased to 15,000, whereas in the case of G.CASE 2 and G.CASE 3, the temperature difference is 153.8 degrees and 152.9 degrees, respectively, under the same conditions, and it can be confirmed that the difference in effect is significant, with a temperature difference of more than 25 degrees.

[0193]

[0194] Meanwhile, even when driven under the condition of 4,500 RPM, G.CASE 1 shows 107.9 degrees, but G.CASE 2 and G.CASE 3 show 99.1 degrees and 99.8 degrees, respectively, showing a difference of about 10 degrees.

[0195]

[0196] Meanwhile, looking at the results of simulating the airflow velocity in the Z-axis direction, under the condition of 15,000 RPM, the velocity is 33.1 for G.CASE 1, but 50.6 and 49.1 for G.CASE 2 and G.CASE 3, respectively, showing a significant difference in the flow velocity of the air circulating inside the motor.

[0197]

[0198] Accordingly, as a result of conducting a simulation on the temperature rise of the magnet and the internal air flow speed according to the speed of the driving motor to which the driving motor composite cooling system according to the embodiment of the present invention is applied, it can be confirmed that it exhibits a remarkable effect compared to the existing structure.

[0199]

[0200] When the fluid cooling system and the air cooling system are provided in the drive motor composite cooling system according to the present invention, the fluid cooling system and the air cooling system are provided and operated separately, but the cooling system by the fluid cooling cools the air cooling path for air cooling, and the heated air inside the motor passing through the air cooling path (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 path, and a cooling system can be provided in which each cooling system comprehensively affects the mutual cooling system.

Claims

1. A stator (40) forming a rotor (50) system; A rotor (50) provided on the inside of a stator (40), rotating around a rotation axis, and having a plurality of vent holes (51) formed therein; 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); In a driving motor comprising 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 re-introduced into the motor; A fluid cooling system in which the coolant injected into the coolant inlet (130) circulates through the coolant flow path formed in the motor housing (10) and cools the motor housing (10) and the stator (40) to a predetermined temperature; An air cooling system is provided in which the air flow generated inside the motor by the rotation of the rotor blade (70) passes through an inlet (200) formed in the cover end (20), an air cooling channel formed in the motor housing, an outlet (300) formed in the cover housing (30), and a vent hole (51) formed in the rotor (50). The above air-cooling cooling system is provided on the outside of the fluid cooling system, and the air-cooling cooling system is a driving motor composite cooling system characterized in that it is cooled in a complex manner by circulating the air-cooling path of the motor housing (10) cooled by the circulation of the cooling liquid of the fluid cooling system.

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 cooling flow paths are formed radially at regular intervals along the circumference. It is formed on the outside of the above-mentioned oil-cooling channel and is configured to include an air-cooling channel that extends to the outer surface of the above-mentioned oil-cooling channel and the space between them. A drive motor composite cooling system characterized in that the cooling efficiency of the above air-cooling cooling system is proportional to the cooling efficiency of the above fluid cooling system.

3. In paragraph 2, The above cooling unit (1) is, A flow path is formed repeatedly from one end to the other end of the motor housing (10), and two or more oil-cooling flow paths are formed radially at regular intervals along the circumference of the motor housing (10), and are formed on the outside of the oil-cooling flow path, and are configured to include an air-cooling flow path that extends to the outer surface of the oil-cooling flow path and the space between them. The above fluid cooling system cools the motor housing (10) and the stator (40) by circulating the cooling liquid through the fluid cooling channel. A composite cooling system for a drive motor characterized in that the cooled air circulated through the air-cooling channel cooled by the above fluid cooling system is introduced into the inside of the motor, thereby cooling the internal components of the motor.

4. In paragraph 2, In the above cover housing (30), On the circumferential surface in contact with the motor housing (10), a "U" cross-section-shaped oil-cooling flow direction changing portion (210, 310) is provided to change the direction of the flow path by connecting with the ends of a pair of oil-cooling flow paths formed by penetrating from one end to the other end of the motor housing, and an air-cooling flow outlet (300) is provided at predetermined intervals on the inner surface to guide the direction of air flowing in through the ends of the air-cooling flow path (120) into the inside of the motor. The circulation of the cooling liquid of the above fluid cooling system is characterized in that it proceeds from one end to the other end through the cooling liquid path formed in the motor housing (10), and then passes through the cooling liquid path direction changer (210, 310) and repeats the process of proceeding from the other end to the first end again.

5. In paragraph 2, The above air-cooling system, The air flow generated by the rotation of the rotor blade (70) inside the motor is introduced into the air cooling channel inlet (200), circulates along the air cooling channel formed in the motor housing (10), and cools the air through heat exchange while passing through the air cooling channel cooled by the fluid cooling system. A drive motor composite cooling system characterized in that the cooled air flows into the motor through the above-mentioned air-cooling outlet (300), cools the air inside the motor heated by the heat source generated from the coil bobbin, passes through the vent hole (51) formed in the rotor (50), returns to the origin, and then moves along the same path repeatedly to cool the components inside the motor.

Images