WO2019187021A1 - Structure de refroidissement destinée à un dispositif électrique rotatif - Google Patents

Structure de refroidissement destinée à un dispositif électrique rotatif Download PDF

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Publication number
WO2019187021A1
WO2019187021A1 PCT/JP2018/013664 JP2018013664W WO2019187021A1 WO 2019187021 A1 WO2019187021 A1 WO 2019187021A1 JP 2018013664 W JP2018013664 W JP 2018013664W WO 2019187021 A1 WO2019187021 A1 WO 2019187021A1
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WO
WIPO (PCT)
Prior art keywords
cooling
flow path
housing
stator
cooling water
Prior art date
Application number
PCT/JP2018/013664
Other languages
English (en)
Japanese (ja)
Inventor
和弥 渥美
藤久保　誠
良 久保田
Original Assignee
本田技研工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 本田技研工業株式会社 filed Critical 本田技研工業株式会社
Priority to JP2020508801A priority Critical patent/JP6942881B2/ja
Priority to CN201880091442.8A priority patent/CN111869058B/zh
Priority to PCT/JP2018/013664 priority patent/WO2019187021A1/fr
Publication of WO2019187021A1 publication Critical patent/WO2019187021A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • the present invention relates to a cooling structure for a rotating electric machine.
  • Rotating electric machines such as motors and generators may be provided with a cooling structure for cooling the stator and rotor.
  • a cooling structure for cooling the stator and rotor.
  • a method of cooling the stator and the rotor there are a method of exchanging heat by bringing a cooling medium such as oil into contact with the stator and the rotor, and a method of bringing a water jacket in which cooling water circulates into contact with the stator.
  • the cooling medium is brought into contact with the stator or the rotor in a casing that accommodates the stator and the rotor, and the cooling medium that has reached a high temperature is cooled by an oil cooler provided outside the casing.
  • Patent Document 1 discloses an electric motor, lubricating oil cooling means that is installed outside the electric motor and cools the lubricating oil of the electric motor with cooling water, cooling water cooling means that cools the cooling water, electric motor, and lubricating oil cooling means.
  • cooling water circulating means for circulating cooling water through a cooling water pipe
  • lubricating oil circulating means for circulating lubricating oil between the lubricating oil cooling means and the motor via the lubricating oil pipe
  • the present invention provides a cooling structure for a rotating electric machine having excellent cooling efficiency.
  • a cooling structure for a rotating electrical machine is a cooling structure for a rotating electrical machine (1) including a stator (20) and a rotor (30), and the stator (20) and the rotor (30). ), A cooling medium (9) that contacts at least one of the stator (20) and the rotor (30) to cool the one, and cooling water (8).
  • the stator across the cooling water pipe (41) 20) a refrigerant pipe (81) adjacent to the cooling water pipe (41) on the side opposite to the cooling water pipe (41), and a refrigerant supply means (59) for supplying the cooling medium to the refrigerant pipe (81).
  • the cooling medium for cooling the rotating electrical machine inside the housing can be simultaneously cooled by the cooling water pipe. it can. Accordingly, the rotating electrical machine can be cooled by both the cooling water pipe and the cooling medium, and the cooling medium can also be cooled by heat exchange with the cooling water pipe inside the rotating electrical machine. Therefore, a rotating electrical machine cooling structure having excellent cooling efficiency can be provided.
  • stator (20) is adjacent to the upper side of the cooling water pipe (41), and the refrigerant pipe (81) is connected to the cooling water pipe ( 41) may be adjacent below.
  • the cooling medium which contacted the stator can be dropped by gravity, and can be guide
  • coolant piping after a cooling medium cools a stator can be formed easily.
  • the stator, the cooling water pipe, and the refrigerant pipe are arranged in the vertical direction, it is possible to suppress an increase in the size of the cooling structure of the rotating electric machine in the rotation axis direction.
  • a storage space (55) for storing the cooling medium (9) may be formed below the cooling water pipe (41). Good.
  • the cooling medium whose temperature has risen in contact with the stator can be circulated through the refrigerant flow path of the refrigerant pipe before being stored in the storage space.
  • the cooling medium whose temperature has increased due to contact with the stator is heat-exchanged with the cooling water pipe in the refrigerant pipe before being mixed with the cooling medium remaining in the storage space and decreasing in temperature. Therefore, the cooling efficiency can be further improved.
  • the refrigerant flow path (82) includes the refrigerant pipe (81) and the cooling water in the rotation axis direction of the rotor (30).
  • the first flow path (83) extending from the first side to the second side in the rotation axis direction and the first flow path (83) communicate with the rotation axis.
  • a second flow path (84) extending from the second side toward the first side in the direction of the rotation axis in a range where the refrigerant pipe (81) and the cooling water pipe (41) overlap in the direction. You may have.
  • the cooling medium can be meandered so as to reciprocate in the direction of the rotation axis along the refrigerant flow path in a range where the refrigerant pipe and the cooling water pipe overlap.
  • the cooling that is in contact with at least one of the stator (20) and the rotor (30) in the first flow path (83).
  • a medium (9) is introduced, a pair of the first flow paths (83) are provided in the circumferential direction around the rotation axis (O) of the rotor (30), and the second flow paths (84) are the pair of pairs. Between the first flow paths (83).
  • the stator is formed in an annular shape when viewed from the rotation axis direction, so that the cooling water pipe adjacent to the stator and the refrigerant pipe adjacent to the cooling water pipe are also from the rotation axis direction.
  • the arc extends concentrically with the stator as viewed.
  • a storage space (55) for storing the cooling medium (9) is formed below the cooling water pipe (41), and the refrigerant
  • the flow path (82) includes a third flow path (85) communicating with the storage space (55), and the refrigerant pipe (81) has a first side surface (81a) facing the first side in the rotation axis direction. ), And the first side surface (81a) has an inlet (83a) of the first flow path (83) through which the cooling medium (9) is introduced, and the first flow path (83) through the first flow path (83).
  • An end opening (85a), said faces the storage space (55), and a second end opening inflow said cooling medium (9) is discharged (85b), may be provided with a.
  • the cooling medium discharged from the discharge port of the second flow path opened in the first side surface of the refrigerant pipe flows into the third flow path through the first end opening, and the refrigerant pipe It discharges from the 2nd end opening opened to two side surfaces.
  • the cooling medium can be meandered so as to reciprocate at least 1.5 in the rotation axis direction along the refrigerant flow path. Therefore, since the heat exchange area of the cooling medium increases in the refrigerant pipe, a larger amount of heat can be exchanged between the cooling medium and the cooling water pipe. Therefore, the cooling efficiency can be further improved.
  • the cooling water flow path (45) extends along a circumferential direction around the rotation axis (O) of the rotor (30). At least a part of the refrigerant flow path (82) may extend along the rotation axis direction of the rotor (30).
  • the coolant flow direction and the coolant flow direction intersect each other, so that the coolant flow channel and the coolant flow are compared with the configuration in which the coolant flow channel and the coolant channel extend in parallel to each other.
  • a path can be easily formed.
  • a cooling structure for a rotating electrical machine having excellent cooling efficiency can be provided.
  • FIG. 2 is a perspective view showing a cross section corresponding to line II-II in FIG. 1.
  • FIG. 3 is a cross-sectional view of a portion corresponding to line III-III in FIG.
  • FIG. 4 is a cross-sectional view of a portion corresponding to line IV-IV in FIG. 3.
  • FIG. 5 is a cross-sectional view of a portion corresponding to line VV in FIG. 1. It is the perspective view which looked at the internal structure of refrigerant piping from the 2nd housing side.
  • FIG. 7 is a cross-sectional view of a portion corresponding to the VII-VII line in FIG. 1.
  • a cooling structure for a motor for driving a vehicle will be described as a cooling structure for a rotating electrical machine.
  • a motor for driving a vehicle (hereinafter referred to as “motor”) is a traveling motor mounted on a vehicle such as a saddle-ride type electric motorcycle.
  • the configuration of the present invention is not limited to a traveling motor, but can be applied to a power generation motor or a rotating electrical machine (including a generator) other than a vehicle.
  • the cooling structure of the motor will be described.
  • FIG. 1 is a cross-sectional view of a motor according to an embodiment.
  • the motor 1 mainly includes a stator 20, a rotor 30, and a housing 3 (housing) that houses the stator 20 and the rotor 30.
  • the direction along the rotation axis O of the rotor 30 is referred to as “axial direction” (rotation axis direction)
  • the circumferential direction around the rotation axis O is referred to as “circumferential direction”
  • the radial direction of the rotor 30 is referred to. It is called “radial direction”.
  • the axial direction is the rotation axis direction of the rotor 30, and the radial direction is a direction extending radially from the rotation axis O perpendicular to the axial direction.
  • the vertical direction used in the following description is a vertical direction in a state where the motor 1 is mounted on a vehicle, and is one direction orthogonal to the axial direction.
  • arrow UP has shown upward.
  • the housing 3 includes a first housing 11 disposed in the central portion in the axial direction, a second housing 12 disposed on the first axial direction side of the first housing 11, and the second housing 12 across the first housing 11.
  • a third housing 13 disposed on the opposite side of the first housing 11, a fourth housing 14 disposed on the opposite side of the first housing 11 across the third housing 13, and a first housing 11 across the second housing 12.
  • a fifth housing 15 disposed on the opposite side.
  • the first housing 11 is formed in a cylindrical shape coaxial with the rotation axis O.
  • the first housing 11 is open on both sides in the axial direction.
  • the first housing 11 is disposed so as to cover the stator 20 and the rotor 30 from the outside in the radial direction.
  • the second housing 12 is formed in a cylindrical shape coaxial with the rotation axis O.
  • the 2nd housing 12 is formed in the bottomed cylindrical shape opened to the 1st housing 11 side.
  • the second housing 12 includes a closing portion 12a extending in a direction orthogonal to the radial direction so as to close one end portion.
  • a through-hole 12b coaxial with the rotation axis O is formed in the closing part 12a.
  • occlusion part 12a is formed in the upper part of the obstruction
  • the third housing 13 is formed in a cylindrical shape coaxial with the rotation axis O.
  • the third housing 13 is open on both sides in the axial direction.
  • the fourth housing 14 is formed in a cylindrical shape coaxial with the rotation axis O.
  • the 4th housing 14 is formed in the bottomed cylindrical shape opened to the 3rd housing 13 side.
  • the fourth housing 14 includes a closing portion 14a extending in a direction orthogonal to the radial direction so as to close one end portion.
  • a through hole 14b coaxial with the rotation axis O is formed in the closing portion 14a.
  • the fifth housing 15 is formed in a cylindrical shape coaxial with the rotation axis O.
  • the fifth housing 15 is formed in a bottomed cylindrical shape opened to the second housing 12 side.
  • the fifth housing 15 includes a closing portion 15a extending in a direction orthogonal to the radial direction so as to close one end portion.
  • a through hole 15b coaxial with the rotation axis O is formed in the closing portion 15a.
  • a motor chamber 5 surrounded by a first housing 11, a second housing 12, a third housing 13, and a fourth housing 14 is formed inside the housing 3.
  • the motor chamber 5 accommodates the stator 20 and the rotor 30.
  • a breather chamber 6 surrounded by the second housing 12 and the fifth housing 15 is provided inside the housing 3.
  • the motor chamber 5 and the breather chamber 6 are separated from each other by a closing portion 12 a of the second housing 12.
  • the breather chamber 6 is configured to allow air inside the motor chamber 5 to escape to the outside of the housing 3.
  • FIG. 2 is a perspective view showing a cross section corresponding to the line II-II in FIG.
  • the breather chamber 6 communicates with the motor chamber 5 through the breather hole 12 c of the second housing 12.
  • the breather chamber 6 includes a plurality of labyrinth-shaped upper communication passages 6a and lower communication passages 6b communicating between the breather chamber 6 and the outside of the housing 3, and air passages extending from the breather holes 12c to the upper communication passage 6a.
  • four ribs 7 are provided.
  • the plurality of ribs 7 are provided below the upper communication path 6a and between the upper communication path 6a and the breather hole 12c when viewed from the axial direction.
  • the plurality of ribs 7 are provided side by side in the vertical direction.
  • the plurality of ribs 7 alternately extend from the peripheral wall of the fifth housing 15 when viewed from the axial direction.
  • Each rib 7 extends beyond the same position as the upper communication path 6a in the horizontal direction. As shown in FIG. 1, each rib 7 extends in the axial direction from the closing portion 15 a of the fifth housing 15 toward the second housing 12. The tips of the ribs 7 are in contact with the closing portion 12 a of the second housing 12.
  • the air that has entered the breather chamber 6 through the breather hole 12 c passes between the labyrinth-shaped ribs 7 and is discharged from the upper communication passage 6 a to the outside of the housing 3. Is done. Further, the refrigerant that has entered the breather chamber 6 cannot pass between the labyrinth-shaped ribs 7, falls to the lower portion of the breather chamber 6, and is discharged from the lower communication passage 6 b to the outside of the housing 3.
  • the stator 20 and the rotor 30 constitute an inner rotor type IPM motor (embedded magnet synchronous motor).
  • FIG. 3 is a cross-sectional view of a portion corresponding to line III-III in FIG.
  • the stator 20 includes a stator core 21 and a coil 22 attached to the stator core 21.
  • the stator core 21 is formed in a cylindrical shape.
  • the stator core 21 is fixed to the first housing 11 by press fitting or the like with the outer peripheral surface being in close contact with the inner peripheral surface of the first housing 11.
  • the outer peripheral surface of the stator core 21 is in contact with the inner peripheral surface of the first housing 11 in the entire axial direction.
  • the stator core 21 is configured by arranging a plurality of divided cores 23 in the circumferential direction.
  • the split core 23 is obtained by laminating magnetic plate materials made of electromagnetic steel plates in the axial direction.
  • the split core 23 includes a back yoke 24 and teeth 25.
  • the back yoke 24 forms an annular portion on the radially outer side of the stator core 21 by connecting the circumferentially adjacent divided cores 23 to each other.
  • the teeth 25 protrude from the back yoke 24 inward in the radial direction.
  • a groove-shaped coil slot 26 is formed between the teeth 25 of the adjacent divided cores 23. That is, the teeth 25 and the coil slots 26 are alternately arranged in the circumferential direction on the stator core 21.
  • the coil slot 26 is open on both sides in the axial direction.
  • the coil 22 is wound around each tooth 25 via an insulator 28 by concentrated winding.
  • the insulator 28 surrounds the teeth 25 of the split core 23.
  • the insulator 28 is made of an electrically insulating material such as resin.
  • the insulator 28 is disposed so as to face the coil 22 between the coil 22 and the tooth 25 and from both sides in the radial direction.
  • the coil 22 includes coil ends 22a protruding from the stator core 21 at both axial ends (see FIG. 1).
  • the rotor 30 is disposed inside the stator 20 at a predetermined interval.
  • the rotor 30 includes a shaft 31 that is rotatably supported by the housing 3, a rotor core 32 that is externally attached to the shaft 31, a magnet 33 that is mounted on the rotor core 32, and a first end that is disposed to face the end surface of the rotor core 32.
  • the shaft 31 extends in the axial direction with the rotation axis O as the central axis.
  • the shaft 31 is inserted through the through hole 12 b of the second housing 12, the through hole 14 b of the fourth housing 14, and the through hole 15 b of the fifth housing 15.
  • the shaft 31 protrudes from the housing 3 on both sides in the axial direction.
  • the shaft 31 is rotatably supported by the second housing 12 via a bearing 101.
  • the shaft 31 is rotatably supported by the fourth housing 14 via a bearing 102.
  • the shaft 31 is rotatably supported by the fifth housing 15 via the bearing 103.
  • the rotor core 32 is formed in a cylindrical shape concentric with the shaft 31, and the rotor core 32 is disposed opposite to the inner peripheral surface of the stator core 21 with a predetermined interval.
  • the rotor core 32 is formed, for example, by laminating a plurality of electromagnetic steel plates in the axial direction.
  • the rotor core 32 is fixed to the shaft 31. Thereby, the rotor core 32 is integrated with the shaft 31 and is rotatable about the rotation axis O with respect to the housing 3 and the stator 20.
  • the rotor core 32 is formed with a slot group 36 in which a magnet 33 is mounted and a lightening hole 37 in each of a predetermined circumferential angle region.
  • the slot group 36 is formed on the outer periphery of the rotor core 32.
  • the slot group 36 includes a pair of magnet slots 38.
  • One magnet 33 is disposed in each of the magnet slots 38.
  • a pair of magnet slots 38 are formed at intervals in the circumferential direction.
  • the magnet slot 38 passes through the rotor core 32 in the axial direction.
  • the pair of magnet slots 38 are formed symmetrically with respect to each other about a half line extending from the rotation axis O toward the central portion in the circumferential direction in the slot group 36 when viewed from the axial direction.
  • the lightening hole 37 penetrates the rotor core 32 in the axial direction.
  • the lightening holes 37 are formed in a triangular shape when viewed from the axial direction.
  • the lightening hole 37 is formed such that the width in the circumferential direction gradually decreases from the radially inner side toward the outer side.
  • the magnet 33 is a rare earth magnet.
  • rare earth magnets include neodymium magnets, samarium cobalt magnets, and praseodymium magnets.
  • the magnet 33 is formed in a rectangular shape when viewed from the axial direction, and extends uniformly along the axial direction.
  • the dimension of the magnet 33 in the axial direction is substantially the same as the dimension of the rotor core 32 in the axial direction.
  • the magnet 33 has a magnetization direction oriented in the radial direction.
  • the first end face plate 34 ⁇ / b> A and the second end face plate 34 ⁇ / b> B are each formed of a nonmagnetic material such as aluminum into a disk shape having substantially the same diameter as the outer diameter of the rotor core 32.
  • a press-fit hole penetrating in the thickness direction (axial direction) is formed at the center of each of the first end face plate 34A and the second end face plate 34B.
  • the first end face plate 34A is disposed to face the first end face of the rotor core 32 facing the second housing 12 side.
  • the first end face plate 34 ⁇ / b> A is externally attached to the shaft 31 and fixed.
  • the first end face plate 34 ⁇ / b> A is in close contact with the first end face of the rotor core 32.
  • the first end face plate 34A restricts the magnet 33 disposed in the magnet slot 38 from dropping off toward the second housing 12 side.
  • the first end face plate 34 ⁇ / b> A is formed with a through hole that communicates the inside of the lightening hole 37 of the rotor core 32 with the motor chamber 5.
  • the second end face plate 34B is disposed opposite to the second end face of the rotor core 32 facing the third housing 13 side.
  • the second end face plate 34 ⁇ / b> B is externally fixed to the shaft 31 and fixed.
  • the second end face plate 34 ⁇ / b> B is in close contact with the second end face of the rotor core 32.
  • the second end face plate 34B restricts the magnet 33 disposed in the magnet slot 38 from dropping off toward the third housing 13 side.
  • the second end face plate 34 ⁇ / b> B is formed with a through hole that communicates the inside of the lightening hole 37 of the rotor core 32 with the motor chamber 5.
  • the cooling structure of the motor 1 of this embodiment includes a water cooling means 40 (cooling means) and an oil cooling means 50.
  • the water cooling means 40 cools the stator 20 and a cooling oil 9 (cooling medium) described later with the cooling water 8.
  • the water cooling means 40 includes a water jacket 41 (cooling water piping), and a water pump and a radiator (not shown).
  • the radiator is provided outside the motor 1.
  • the water cooling means 40 circulates the cooling water 8 between the water jacket 41 and the radiator by a water pump provided between the water jacket 41 and the radiator.
  • the water jacket 41 is formed on the inner periphery of the first housing 11. That is, the water jacket 41 is in close contact with the outer peripheral surface of the stator core 21.
  • the water jacket 41 is provided with a cooling water passage 45 through which the cooling water 8 pumped from the water pump flows.
  • the cooling water channel 45 extends in an arc shape along the circumferential direction.
  • the cooling water channel 45 is provided symmetrically with respect to a straight line extending in the vertical direction perpendicular to the rotation axis O when viewed from the axial direction.
  • the cooling water channel 45 includes a pair of cooling water inlets 46 and a pair of cooling water outlets 47.
  • the pair of cooling water inlets 46 are provided at both ends of the cooling water flow path 45.
  • the pair of cooling water inlets 46 is provided in the upper part of the first housing 11.
  • the pair of cooling water inlets 46 opens upward on the outer surface of the first housing 11.
  • the pair of cooling water outlets 47 are provided in the middle part of the cooling water passage 45.
  • the pair of cooling water outlets 47 is provided below the rotation axis O when viewed from the axial direction and above the lowermost part of the cooling water channel 45.
  • the pair of cooling water outlets 47 are opened obliquely downward on the outer surface of the first housing 11.
  • the cooling water passage 45 extends with a constant width with the axial direction as the width direction.
  • a plurality of protrusions 49 that locally narrow the channel cross-sectional area are provided on the inner surface of the cooling water channel 45.
  • the protrusions 49 are alternately protruded from the inner surfaces on both sides in the axial direction of the cooling water passage 45, and the protrusions 49 are connected to the inner surfaces on both sides in the radial direction of the cooling water passage 45.
  • Each protrusion 49 extends such that the tip is positioned on the center line C in the width direction of the cooling water flow path 45 or the tip extends over the center line C. In the present embodiment, the tip of each protrusion 49 is located on the center line C.
  • At least a part of the plurality of protrusions 49 is provided at the same position as the teeth 25 of the split core 23 in the circumferential direction. That is, the flow path cross-sectional area of the cooling water flow path 45 is locally small at the same position as the teeth 25 in the circumferential direction.
  • the cooling water 8 cooled by the radiator is pumped to the cooling water flow path 45 by the water pump.
  • the cooling water 8 that has flowed into the cooling water passage 45 cools the stator core 21 that is in close contact with the water jacket 41 in the course of flowing through the cooling water passage 45.
  • the cooling water 8 whose temperature has risen through the cooling water flow path 45 is transported again to the radiator and cooled.
  • the oil cooling means 50 cools the stator 20 and the rotor 30 with the cooling oil 9.
  • the oil cooling means 50 includes a refrigerant introduction part 51, a rotor oil cooling part 60, a stator oil cooling part 70, a refrigerant cooling part 80, a storage part 54, a discharge part 57, a refrigerant guide part 90, an oil pump. 59 (refrigerant supply means).
  • the refrigerant introduction unit 51 receives the cooling oil 9 pumped from the oil pump 59 and introduces it into the housing 3.
  • the refrigerant introduction part 51 includes an introduction flow path 52 provided in the closing part 14 a of the fourth housing 14.
  • the introduction channel 52 extends in the vertical direction.
  • the lower end portion of the introduction flow path 52 is open to the outer surface of the housing 3.
  • the upper end portion of the introduction flow path 52 is open to the inner peripheral surface of the through hole 14 b of the fourth housing 14.
  • the rotor oil cooling unit 60 cools the rotor 30 with the cooling oil 9.
  • the rotor oil cooling section 60 includes a shaft flow path 61 formed in the shaft 31 of the rotor 30, a communication section 62 that communicates the shaft flow path 61 and the lightening hole 37 of the rotor core 32, and a lightening hole 37 of the rotor core 32. And comprising.
  • the shaft channel 61 extends along the axial direction inside the shaft 31.
  • the shaft flow path 61 includes an inlet 63 and an outlet 64.
  • the inflow port 63 is provided at a position facing the inner peripheral surface of the through hole 14b of the fourth housing 14 in the radial direction.
  • the inflow port 63 is formed at the same position as the upper end portion of the introduction flow path 52 in the axial direction.
  • the inflow port 63 is formed so as to penetrate the peripheral wall of the shaft 31.
  • the outflow port 64 is provided at a position facing the inner peripheral surface of the rotor core 32 in the radial direction.
  • the outlet 64 is formed at the same position as the center of the rotor core 32 in the axial direction.
  • the outlet 64 is formed so as to penetrate the peripheral wall of the shaft 31.
  • the communication part 62 is formed in the rotor core 32.
  • the communication part 62 is formed at the same position as the lightening hole 37 of the rotor core 32 in the circumferential direction.
  • the communication part 62 is formed at the same position as the center of the rotor core 32 in the axial direction.
  • the communication part 62 penetrates between the inner peripheral surface of the rotor core 32 and the inner surface of the lightening hole 37.
  • the communication part 62 is open at a position facing the outlet 64 of the shaft flow path 61 on the inner peripheral surface of the rotor core 32. Thereby, the communication part 62 communicates the shaft flow path 61 and the lightening hole 37.
  • the cooling oil 9 in the shaft flow path 61 is caused to flow out into the lightening holes 37 of the rotor core 32 by the centrifugal force accompanying the rotation of the shaft 31.
  • the refrigerant that has flowed into the lightening hole 37 is diverted toward both sides in the axial direction, and is discharged into the motor chamber 5 through the through holes of the first end face plate 34A and the second end face plate 34B. Thereby, the rotor core 32 exchanges heat with the cooling oil 9 and is cooled.
  • the stator oil cooling unit 70 cools the stator 20 with the cooling oil 9.
  • the stator oil cooling unit 70 includes a nozzle member 71.
  • the nozzle member 71 discharges the cooling oil 9 transported from the refrigerant introduction part 51 toward the stator 20.
  • the nozzle member 71 is provided between the stator 20 and the closing portion 14 a of the fourth housing 14.
  • the nozzle member 71 includes a base 72 that is in close contact with the closing portion 14 a of the fourth housing 14, and a nozzle 73 that extends from the base 72 toward the stator 20.
  • a groove portion 74 that forms a flow path for the cooling oil 9 is formed between the base portion 72 and the closing portion 14 a of the fourth housing 14.
  • the groove 74 extends in an annular shape along the circumferential direction.
  • the groove 74 communicates with the introduction channel 52 through a channel (not shown).
  • the same number of nozzles 73 as the coil slots 26 (see FIG. 3) of the stator core 21 are provided.
  • the nozzle 73 extends in the axial direction.
  • the base end portion of the nozzle 73 is open to the wall surface of the groove portion 74.
  • the tip of the nozzle 73 is disposed at a position facing the coil slot 26 of the stator core 21 (see FIG. 7).
  • the cooling oil 9 pressure-fed from the oil pump 59 into the groove section 74 through the introduction flow path 52 is discharged from the tip end portion of the nozzle 73.
  • a part of the cooling oil 9 discharged from the nozzle 73 flows through the coil slot 26 of the stator core 21 along the axial direction.
  • the cooling oil 9 flows in the axial direction through a pair of coils 22 wound around the teeth 25 of the adjacent split cores 23.
  • the coil 22 exchanges heat with the cooling oil 9 and is cooled.
  • the cooling oil 9 that has passed between the pair of coils 22 flows out into the space between the stator 20 and the second housing 12 in the motor chamber 5.
  • the remainder of the cooling oil 9 discharged from the nozzle 73 does not flow into the coil slot 26 of the stator core 21 but flows out into the space between the stator 20 and the fourth housing 14 in the motor chamber 5.
  • the cooling oil 9 that has flowed into the space between the stator 20 and the fourth housing 14 falls and is stored in a storage space 55 described later.
  • the refrigerant cooling unit 80 cools a part of the cooling oil 9 whose temperature has increased by exchanging heat with the stator 20 and the rotor 30 by the rotor oil cooling unit 60 and the stator oil cooling unit 70.
  • the refrigerant cooling unit 80 includes a refrigerant pipe 81.
  • the refrigerant pipe 81 is formed in the first housing 11.
  • the refrigerant pipe 81 is provided with a refrigerant flow path 82 through which the cooling oil 9 flows. That is, the refrigerant pipe 81 is a portion where the refrigerant flow path 82 in the first housing 11 is provided.
  • the refrigerant pipe 81 is provided on the outer side in the radial direction and below the water jacket 41. Specifically, the refrigerant pipe 81 is provided below the lowermost part of the water jacket 41.
  • the refrigerant flow path 82 includes a first flow path 83, a second flow path 84, and a third flow path 85, and includes a first flow path 83, a second flow path 84, and a second flow path.
  • Each of the three flow paths 85 penetrates the first housing 11 in the axial direction.
  • FIG. 5 is a cross-sectional view of a portion corresponding to line VV in FIG.
  • a pair of first flow paths 83 are provided in the circumferential direction.
  • the pair of first flow paths 83 are provided at intervals in the circumferential direction.
  • the pair of first flow paths 83 are provided symmetrically when viewed from the axial direction.
  • the lower surface of the first flow path 83 extends while being inclined downward as it goes from the second housing 12 side to the third housing 13 side in the axial direction.
  • the first flow path 83 includes an introduction port 83a.
  • the introduction port 83a is open to the first side surface 81a facing the second housing 12 in the axial direction of the refrigerant pipe 81.
  • the introduction port 83a is formed in an oval shape whose major axis is along the circumferential direction.
  • a pair of second flow paths 84 are provided in the circumferential direction.
  • the pair of second flow paths 84 are provided between the pair of first flow paths 83.
  • a pair of 2nd flow paths 84 are provided in the circumferential direction at intervals.
  • the pair of second flow paths 84 are provided symmetrically when viewed from the axial direction.
  • the lower surface of the second flow path 84 is inclined and extends downward as it goes from the third housing 13 side to the second housing 12 side in the axial direction.
  • the second flow path 84 includes a discharge port 84 a that opens to the first side surface 81 a of the refrigerant pipe 81.
  • the discharge port 84a is formed in an oval shape whose major axis is along the circumferential direction.
  • the lower edge of the discharge port 84 a is provided below the lower edge of the introduction port 83 a of the first flow path 83.
  • FIG. 6 is a perspective view of the internal structure of the refrigerant pipe as viewed from the second housing side.
  • the second flow path 84 is continuous with the end of the first flow path 83 adjacent in the circumferential direction on the third housing 13 side in the circumferential direction.
  • the openings on the third housing 13 side of the first flow path 83 and the second flow path 84 that are adjacent to each other in the circumferential direction are continuous with each other.
  • the lower surfaces of the first channel 83 and the second channel 84 are smoothly connected to each other at the end on the third housing 13 side.
  • FIG. 7 is a cross-sectional view of a portion corresponding to the line VII-VII in FIG. As shown in FIG. 7, the openings on the third housing 13 side of the first flow path 83 and the second flow path 84 are closed by the third housing 13 with only the upper end portion opened slightly. As a result, the cooling oil 9 that has become excessive in the first flow path 83 and the second flow path 84 can flow out to the third housing 13 side.
  • a pair of third flow paths 85 are provided in the circumferential direction.
  • the pair of third flow paths 85 are provided below the first flow path 83 and the second flow path 84.
  • the pair of third flow paths 85 are provided at intervals in the circumferential direction.
  • the pair of third flow paths 85 are provided symmetrically when viewed from the axial direction.
  • the lower surface of the third flow path 85 extends while inclining downward as it goes from the second housing 12 side to the third housing 13 side in the axial direction.
  • the third flow path 85 includes a first end opening 85 a that opens to the first side surface 81 a of the refrigerant pipe 81 and a second end opening that opens to the second side surface 81 b of the refrigerant pipe 81. 85b.
  • the first end opening 85 a is provided below the discharge port 84 a of the second flow path 84.
  • the lower edge of the first end opening 85 a is continuous with the lowermost part of the inner surface of the second housing 12.
  • the storage portion 54 is formed across the third housing 13 and the fourth housing 14.
  • a storage space 55 for finally storing the cooling oil 9 introduced into the housing 3 is formed in the storage part 54. That is, the storage portion 54 is a portion where the storage space 55 in the third housing 13 and the fourth housing 14 is provided.
  • the storage space 55 is formed below the lowermost part of the water jacket 41.
  • the storage space 55 opens upward and communicates with the motor chamber 5.
  • the second end opening 85b of the third flow path 85 faces the storage space 55, and the third flow path 85 communicates (see FIG. 7).
  • the discharge part 57 discharges the cooling oil 9 stored in the storage space 55 to the outside of the housing 3.
  • the discharge part 57 penetrates the lower part of the storage part 54 in the vertical direction.
  • the discharge part 57 penetrates the lower part of the fourth housing 14.
  • the upper end portion of the discharge portion 57 is open to the lower surface of the storage space 55.
  • a lower end portion of the discharge portion 57 is open to the outer surface of the housing 3.
  • the refrigerant guide 90 guides the cooling oil 9 that has flowed into the space between the stator 20 and the second housing 12 to a predetermined position.
  • the refrigerant guide 90 includes a fall prevention wall 91, a scattering prevention wall 92, and an introduction wall 94.
  • the fall prevention wall 91 passes between adjacent coils 22, and the cooling oil 9 that has flowed into the space between the stator 20 and the second housing 12 falls into the rotor 30. To suppress that.
  • the fall prevention wall 91 extends in the axial direction from the inner surface of the closing portion 12 a of the second housing 12 toward the stator 20.
  • the fall prevention wall 91 is provided so as to cover the rotor 30 from above when viewed in the axial direction.
  • the fall prevention wall 91 extends in an arc shape centered on the rotation axis O when viewed from the axial direction.
  • the top surface of the fall prevention wall 91 extends in the circumferential direction at the same position as the radially inner end of the coil slot 26 (see FIG.
  • the tip of the fall prevention wall 91 is opposed to and close to the end of the stator 20 on the second housing 12 side in the axial direction (the end of the insulator 28 in the illustrated example).
  • the cooling oil 9 that has flowed out between the adjacent coils 22 is guided along the outer peripheral surface of the fall prevention wall 91 to the outer side in the horizontal direction than the rotor 30 when viewed from the axial direction.
  • the scattering prevention wall 92 prevents the cooling oil 9 that has passed between the adjacent coils 22 and has flowed into the space between the stator 20 and the second housing 12 from splashing outward in the radial direction.
  • the scattering prevention wall 92 extends in the axial direction from the inner surface of the closing portion 12 a of the second housing 12 toward the first housing 11.
  • the anti-scattering wall 92 is provided so as to cover the stator 20 from above when viewed in the axial direction.
  • the scattering prevention wall 92 extends in an arc shape centered on the rotation axis O when viewed from the axial direction.
  • the scattering prevention wall 92 extends in the circumferential direction at the same position between the breather hole 12 c of the second housing 12 and the stator 20.
  • the front end of the scattering prevention wall 92 faces the first housing 11 in the vicinity. As a result, the cooling oil 9 that has flowed out through the coil slot 26 of the stator core 21 is prevented from splashing radially outward and upward and entering the breather hole 12c.
  • the introduction wall 94 guides the cooling oil 9 that has flowed into the space between the stator 20 and the second housing 12 to the introduction port 83 a of the first flow path 83 of the refrigerant pipe 81.
  • the introduction port 83 a extends in the axial direction from the inner surface of the closing portion 12 a of the second housing 12 toward the first housing 11.
  • the leading edge of the introduction wall 94 is in contact with the first side surface 81 a of the refrigerant pipe 81.
  • the introduction wall 94 is supported from below by a support member 95 extending from between the first end openings 85 a of the pair of third flow paths 85 in the first housing 11.
  • the introduction wall 94 is provided below the stator 20.
  • the introduction wall 94 extends wider in the horizontal direction than the stator 20 when viewed from the axial direction.
  • the introduction wall 94 includes an intermediate portion 94a that covers the discharge ports 84a of the pair of second flow paths 84 from the upper side and the side when viewed from the axial direction, and first flow from both ends of the intermediate portion 94a as viewed from the axial direction.
  • a pair of side portions 94b extending below the introduction port 83a of the path 83.
  • the intermediate portion 94a extends while inclining downward as it moves away from the straight line orthogonal to the rotation axis O when viewed from the axial direction.
  • the side portion 94b extends while being inclined upward as it is separated from the end portion of the intermediate portion 94a in the horizontal direction.
  • the upper surface of the side portion 94b extends along the lower edge of the inlet 83a of the first flow path 83 in the vicinity of the connection portion between the intermediate portion 94a and the side portion 94b.
  • the cooling oil 9 that has fallen from the fall prevention wall 91 after passing through the upper surface of the fall prevention wall 91 is received by the pair of side portions 94b.
  • the cooling oil 9 that has dropped onto the side portion 94 b of the introduction wall 94 flows according to the inclination of the side portion 94 b and is guided to the introduction port 83 a of the first flow path 83.
  • the introduction wall 94 receives the cooling oil 9 that has dropped from the lightening hole 37 of the rotor core 32 toward the second housing 12 at the intermediate portion 94a.
  • the cooling oil 9 that has dropped onto the intermediate portion 94 a of the introduction wall 94 flows according to the inclination of the intermediate portion 94 a and is guided to the introduction port 83 a of the first flow path 83.
  • the cooling oil 9 introduced into the first channel 83 from the inlet 83a is discharged from the outlet 84a of the second channel 84 through the first channel 83 and the second channel 84. At this time, the cooling oil 9 flows while meandering in a region overlapping the water jacket 41 as viewed from the radial direction.
  • the cooling oil 9 discharged from the discharge port 84 a of the second flow path 84 falls to the lower part of the motor chamber 5 and flows into the third flow path 85 from the first end opening 85 a of the third flow path 85.
  • the cooling oil 9 flowing into the third flow path 85 flows according to the inclination of the lower surface of the third flow path 85 and is discharged from the second end opening 85b.
  • the cooling oil 9 discharged from the second end opening 85 b of the third flow path 85 is stored in the storage space 55 of the storage portion 54 and is appropriately discharged from the discharge portion 57.
  • the cooling structure of the motor 1 of the present embodiment includes the housing 3, the cooling oil 9 that cools in contact with the stator 20 and the rotor 30, and the water cooling means 40 that cools the cooling oil 9 using the cooling water 8.
  • the cooling oil 9 has a water jacket 41 formed in the housing 3 and provided with a cooling water passage 45 through which the cooling water 8 flows, and the water jacket 41 is adjacent to the stator 20 and the cooling oil 9 flows.
  • a refrigerant flow path 82 is provided, and includes a refrigerant pipe 81 adjacent to the water jacket 41 on the side opposite to the stator 20 across the water jacket 41, and an oil pump 59 that supplies the cooling oil 9 to the refrigerant pipe 81.
  • the cooling oil 9 that cools the motor 1 inside the housing 3 is also simultaneously cooled by the water jacket 41 in the refrigerant pipe 81 adjacent to the water jacket 41. can do.
  • the motor 1 can be cooled by both the water jacket 41 and the cooling oil 9, and the cooling oil 9 can also be cooled by heat exchange with the water jacket 41 inside the motor 1. Therefore, a motor cooling structure having excellent cooling efficiency can be provided.
  • the oil cooler is used to increase the heat exchange area when improving the cooling efficiency of the oil cooler.
  • the amount of cooling oil that circulates inside increases.
  • the cooling structure may be complicated.
  • the cooling oil 9 can also be cooled by heat exchange with the water jacket 41 inside the motor 1, so that the motor cooling structure can be simply configured.
  • the stator 20 is adjacent to the upper portion of the water jacket 41, and the refrigerant pipe 81 is adjacent to the lower portion of the water jacket 41.
  • the cooling oil 9 in contact with the stator 20 can be dropped by gravity and guided to the refrigerant flow path 82 of the refrigerant pipe 81.
  • the flow toward the refrigerant pipe 81 after the cooling oil 9 cools the stator 20 can be easily formed.
  • coolant piping 81 are located in a line with the up-down direction, it can suppress that the cooling structure of a motor enlarges to an axial direction.
  • a storage space 55 for storing the cooling oil 9 is formed below the water jacket 41.
  • the cooling oil 9 whose temperature has increased in contact with the stator 20 can be circulated through the refrigerant flow path 82 of the refrigerant pipe 81 before being stored in the storage space 55.
  • the cooling oil 9 whose temperature has increased in contact with the stator 20 is heat-exchanged with the water jacket 41 in the refrigerant pipe 81 before being mixed with the cooling oil 9 remaining in the storage space 55 and decreasing in temperature. Therefore, the cooling efficiency can be further improved.
  • the refrigerant flow path 82 includes a first flow path 83 that extends from the second housing 12 side in the axial direction toward the third housing 13 side in a range where the refrigerant pipe 81 and the water jacket 41 overlap in the axial direction, In the range where the refrigerant pipe 81 and the water jacket 41 overlap in the direction, a second flow path 84 extending from the third housing 13 side toward the second housing 12 side in the axial direction is provided.
  • the cooling oil 9 can be meandered so as to reciprocate in the axial direction along the refrigerant flow path 82 in a range where the refrigerant pipe 81 and the water jacket 41 overlap.
  • a pair of first flow paths 83 are provided in the circumferential direction, and a second flow path 84 is provided between the pair of first flow paths 83.
  • the stator 20 is formed in an annular shape when viewed from the axial direction, the water jacket 41 adjacent to the stator 20 and the refrigerant pipe 81 adjacent to the water jacket 41 are also viewed from the axial direction.
  • the arc extends concentrically with the stator 20.
  • the second flow path 84 provided between the pair of first flow paths 83 is positioned below the first flow path 83.
  • the cooling oil 9 can be caused to flow by gravity from the first flow path 83 toward the second flow path 84. Therefore, the cooling oil 9 can flow smoothly in the refrigerant flow path 82.
  • the refrigerant flow path 82 includes a third flow path 85 that communicates with the storage space 55, and the third flow path 85 opens to the first side surface 81 a of the refrigerant pipe 81 and is discharged from the second flow path 84. Flows into the first end opening 85a and the second end opening 85b that faces the storage space 55 and discharges the cooling oil 9 that has flowed in.
  • the cooling oil 9 discharged from the discharge port 84a of the second flow path 84 opened in the first side surface 81a of the refrigerant pipe 81 flows into the third flow path 85 through the first end opening 85a,
  • the refrigerant pipe 81 is discharged from the second end opening 85b opened in the second side surface 81b.
  • the cooling oil 9 can be meandered so as to reciprocate at least 1.5 in the axial direction along the refrigerant flow path 82. Therefore, since the heat exchange area of the cooling oil 9 increases in the refrigerant pipe 81, a larger amount of heat can be exchanged between the cooling oil 9 and the water jacket 41. Therefore, the cooling efficiency can be further improved.
  • the water jacket 41 extends along the circumferential direction, and at least a part of the coolant channel 82 extends along the axial direction. According to this configuration, since the flow direction of the cooling water 8 and the flow direction of the cooling oil 9 intersect, the cooling water flow channel 45 and the cooling water flow channel 45 and the refrigerant flow channel 82 are compared with the configuration in which the cooling water flow channel 45 and the refrigerant flow channel 82 extend in parallel to each other. The coolant channel 82 can be easily formed.
  • the cooling water flow path 45 is formed by the protrusion part 49 provided in the inner surface so that a flow-path cross-sectional area may become small locally in the same position as the teeth 25 in the circumferential direction. According to this configuration, since the flow velocity of the cooling water 8 is increased at the same position as the teeth 25 in the circumferential direction, the cooling efficiency of the water jacket 41 can be improved at the same positions as the teeth 25 in the circumferential direction. Therefore, the teeth 25 around which the coil 22 that is a heat generating portion is wound can be efficiently cooled by the water jacket 41.
  • the present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope thereof.
  • the lightening holes 37 of the rotor core 32 are provided at the same positions as the slot groups 36 in the circumferential direction, but may be provided between the slot groups 36 in the circumferential direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

La présente invention concerne une structure de refroidissement destinée à un dispositif électrique rotatif pourvue : d'un boîtier qui reçoit un stator et un rotor ; d'un milieu de refroidissement qui entre en contact avec le stator et le rotor et refroidit le stator et le rotor ; d'un moyen de refroidissement qui refroidit le milieu de refroidissement par l'intermédiaire d'eau de refroidissement, et a une tuyauterie d'eau de refroidissement qui est formée dans le boîtier et est pourvue d'un trajet d'écoulement d'eau de refroidissement à travers lequel circule de l'eau de refroidissement, la tuyauterie d'eau de refroidissement étant adjacente au stator ; d'une tuyauterie de liquide de refroidissement qui est pourvue d'un trajet d'écoulement de liquide de refroidissement à travers lequel circule le milieu de refroidissement, et est adjacent à la tuyauterie d'eau de refroidissement sur un côté opposé au stator de façon à prendre en sandwich la tuyauterie d'eau de refroidissement ; et d'un moyen de fourniture de liquide de refroidissement qui fournit le milieu de refroidissement à la tuyauterie de liquide de refroidissement.
PCT/JP2018/013664 2018-03-30 2018-03-30 Structure de refroidissement destinée à un dispositif électrique rotatif WO2019187021A1 (fr)

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JP2020508801A JP6942881B2 (ja) 2018-03-30 2018-03-30 回転電機の冷却構造
CN201880091442.8A CN111869058B (zh) 2018-03-30 2018-03-30 旋转电机的冷却结构
PCT/JP2018/013664 WO2019187021A1 (fr) 2018-03-30 2018-03-30 Structure de refroidissement destinée à un dispositif électrique rotatif

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CN111869058B (zh) 2023-06-09

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