WO2021100257A1 - 回転電機 - Google Patents
回転電機 Download PDFInfo
- Publication number
- WO2021100257A1 WO2021100257A1 PCT/JP2020/029501 JP2020029501W WO2021100257A1 WO 2021100257 A1 WO2021100257 A1 WO 2021100257A1 JP 2020029501 W JP2020029501 W JP 2020029501W WO 2021100257 A1 WO2021100257 A1 WO 2021100257A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- refrigerant
- shaft
- electric machine
- flow path
- impeller
- Prior art date
Links
- 230000007246 mechanism Effects 0.000 claims abstract description 82
- 230000005540 biological transmission Effects 0.000 claims abstract description 27
- 239000003507 refrigerant Substances 0.000 claims description 305
- 230000002265 prevention Effects 0.000 claims description 17
- 238000004891 communication Methods 0.000 claims description 13
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 230000007423 decrease Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 abstract description 31
- 238000005086 pumping Methods 0.000 abstract description 29
- 230000004323 axial length Effects 0.000 abstract description 9
- 239000002826 coolant Substances 0.000 abstract description 8
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 238000012546 transfer Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 230000005484 gravity Effects 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000010687 lubricating oil Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910000828 alnico Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
- H02K7/1163—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears where at least two gears have non-parallel axes without having orbital motion
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
- H02K9/227—Heat sinks
Definitions
- Patent Document 1 the oil pump described in Patent Document 1 is installed at the same height as the lower stator because it is difficult to pump the refrigerant below the stator. In addition, it is necessary to store the refrigerant up to the height of the stator even during operation. Therefore, the lower stator is always immersed in the refrigerant, and there is a problem that the cooling becomes uneven.
- the rotary electric machine 1 includes a housing 2 forming an outer frame, a cylindrical stator 12 provided in the housing 2, and a cylindrical rotor 18 provided inside the stator 12 in the radial direction. At the center of the rotor 18, a first shaft 17 forming the rotation axis of the rotor 18 is provided. Further, the housing 2 has a drain portion 7 at the bottom for holding the cooling refrigerant.
- the refrigerant 5 means a refrigerant that circulates inside the rotary electric machine 1.
- the stator 12 held by shrink fitting or bolts in the housing 2 is composed of a stator core 10 (iron core) and a coil 11 (winding wire) mounted on the stator core 10.
- the stator core 10 is formed by laminating thin steel plates having excellent magnetic characteristics in the axial length direction of the first shaft 17. Further, the stator core 10 includes a teeth portion (not shown) formed so as to project inward in the radial direction through a predetermined interval in the circumferential direction. Therefore, when the stator core 10 is viewed from the axial length direction of the first shaft 17, the ⁇ -shaped tooth portions are arranged in the circumferential direction.
- the teeth portion may be configured to have a T-shape instead of a ⁇ -shape.
- FIG. 2 is a cross-sectional view of the rotor core 13 seen from the line AA of the rotary electric machine 1 of FIG.
- two permanent magnets 14 adjacent to each other are provided in a V shape so as to open radially outward of the first shaft 17.
- the shape of the permanent magnet 14 is a rectangular parallelepiped, and it is made of a material such as alnico, ferrite, or neodymium.
- FIG. 3 is an enlarged view of a part of a cross-sectional view of the rotor core 13 of FIG.
- the axial flow path 70 is a flow path provided so that the refrigerant 5 flows from the end on the non-output side to the middle of the first shaft 17 along the axial length direction of the first shaft 17, that is, the rotation axis direction.
- the cross section in the direction of the rotation axis is a circular hole.
- the radial flow path 71 is a flow path connecting the axial flow path 70 and the non-output side end plate refrigerant flow path 26, and extends radially from the center of the first shaft 17 toward the cylindrical surface.
- FIG. 4 shows four flow paths as an example of the radial flow path 71, it may be composed of one or more flow paths.
- the pumping mechanism of the refrigerant 5 includes a power transmission mechanism 32 that transmits the rotational power of the rotor 18 to the second shaft 31, an impeller 30 that sucks the refrigerant 5, and a second shaft 31 that forms the rotating shaft of the impeller 30. It is composed of a casing 8 to be used.
- the pumping mechanism of the refrigerant 5 draws the refrigerant 5 of the drain portion 7 into the heat exchanger 40 provided in the casing 8, cools the refrigerant 5, and cools the cooled refrigerant 5 again through the flow path of the first shaft 17 to the housing 2. Supply to the internal heat generating part.
- the refrigerant 5 stored in the drain portion 7 at the lower part of the housing 2 is pumped up to at least the height of the first shaft 17 and circulated inside the rotary electric machine 1. I'm letting you.
- the impeller 30 is attached to a second shaft 31 that extends vertically with respect to the first shaft 17.
- the second shaft 31 is rotated by a power transmission mechanism 32 that transmits the rotational power of the first shaft 17. That is, the impeller 30 provided on the second shaft 31 is driven by the rotation of the first shaft 17 via the power transmission mechanism 32.
- the power transmission mechanism 32 that transmits the rotational power of the first shaft 17 to the second shaft 31 is a portion of the first shaft 17 that protrudes from the housing 2 and that protrudes to the non-output side of the housing 2 and a second portion. It is provided between both ends of the shaft 31 and one end of the first shaft 17 on the side close to the protruding portion on the non-output side.
- the power transmission mechanism 32 may be any mechanism that rotates the second shaft 31 by the rotation of the first shaft 17, and examples thereof include gears, bevel gears, and face gears. However, the mechanism is not limited to these, and any other mechanism may be used as long as it is a mechanism for transmitting the rotational power of the first shaft 17 to the impeller 30. Further, the power transmission mechanism 32 is not limited to the metal one.
- the second shaft 31 may be provided, for example, at a position from 70 ° to 110 ° instead of (vertical).
- the impeller 30 like the pumping mechanism of the refrigerant 5 of the present disclosure, it is possible to easily pump up to the upper part of the impeller 30 as compared with the conventional pump. That is, the pumping mechanism of the refrigerant 5 of the present disclosure can supply the refrigerant 5 stored in the drain portion 7 at the lower part of the housing 2 to the heat generating portion inside the housing 2.
- the casing 8 provided on the outer surface of the housing 2 accommodates a protrusion on the non-output side of the first shaft 17, a power transmission mechanism 32, a second shaft 31, an impeller 30, and an impeller cover 34. doing.
- the casing 8 is arranged so as to be connected to the non-output side bracket 4. Further, inside the casing 8, a heat exchanger 40 for heat exchange of the refrigerant 5 and a first refrigerant storage unit 60 for storing the heat-exchanged refrigerant 5 are provided inside the casing 8, a heat exchanger 40 for heat exchange of the refrigerant 5 and a first refrigerant storage unit 60 for storing the heat-exchanged refrigerant 5 are provided. That is, the casing 8 is provided with a pumping mechanism for the refrigerant 5.
- the heat exchanger 40 is provided at the bottom of the casing 8 and cools the refrigerant 5 stored in the drain portion 7 of the housing 2. That is, it is provided at a position such that it contacts the side surface of the housing 2 at the bottom of the casing 8. From here, the configuration of the heat exchanger 40 will be described with reference to FIGS. 5 and 6.
- FIG. 5 is a schematic configuration diagram of a plate heat exchanger 41 which is a specific example of the heat exchanger 40.
- FIG. 6 is an enlarged cross-sectional view of a main part around the heat exchanger 40, showing the relationship between the heat exchanger 40 and the drain portion 7, and the heat exchanger 40 and the first refrigerant storage portion 60.
- the heat exchanger 40 is provided between the first refrigerant storage unit 60 and the drain unit 7, which is the rotation space of the impeller 30. That is, the heat exchanger 40 is provided between the impeller 30 and the drain portion 7.
- a pump that sucks in the refrigerant 5 for example, a positive displacement pump such as a trochoid pump or a vane pump, and a refrigerant reservoir that stores the refrigerant 5 are configured to form a resistance such as a heat exchanger 40 or a valve. There was a problem that the suction efficiency of the pump was lowered because it was installed.
- the heat transfer plate 46 is laminated so that the heat transfer plate 46 through which only the refrigerant 5 flows and the heat transfer plate 46 through which only the external refrigerant 6 flows are alternately overlapped so that the refrigerants do not mix with each other.
- the plate heat exchanger 41 has a relatively high heat exchange efficiency per unit volume as compared with other heat exchangers. Therefore, by using the plate type heat exchanger 41 for the heat exchanger 40 of the present disclosure, the portion required for installing the heat exchanger inside the rotary electric machine 1 becomes smaller, so that the rotary electric machine 1 as a whole can be miniaturized. ..
- a second inflow / outflow direction switching mechanism 48 is provided between the drain unit 7 and the heat exchanger 40, and a first inflow / outflow direction switching mechanism 47 is provided between the heat exchanger 40 and the first refrigerant storage unit 60.
- the first inflow / outflow direction switching mechanism 47 is arranged on the lower side of the impeller 30 in the direction of gravity.
- connection of the flow path is switched so that the external refrigerant flow path 50 of the direction switching mechanism 48 is connected to the external refrigerant inflow / outflow hole 44 of the plate heat exchanger 41.
- the first refrigerant storage unit 60 is provided at a position where the refrigerant 5 heat exchanged by the heat exchanger 40 is stored via the first inflow / outflow direction switching mechanism 47, and serves as a rotating space for the impeller 30. Further, when viewed from the bottom of the rotary electric machine 1, the height of the liquid level of the refrigerant 5 in the first refrigerant storage unit 60 is the height at which the impeller 30 is immersed in the refrigerant 5 before the start of pumping the refrigerant. It is desirable that the refrigerant 5 is located higher than the impeller 30 when the refrigerant 5 is started to be pumped.
- an impeller bearing mechanism 61 is provided in the casing 8 via a support member 62 in order to support the second shaft 31.
- a second refrigerant storage unit 63 for storing the refrigerant 5 pumped by the impeller 30 from the first refrigerant storage unit 60 is provided on the lower side of the support member 62, that is, on the side where the impeller 30 is provided. ..
- a third refrigerant storage unit 64 for storing the refrigerant 5 flowing in from the second refrigerant storage unit 63 is provided on the upper side of the support member 62, that is, on the side where the power transmission mechanism 32 is provided.
- the support member 62 is provided with a communication hole 65 that communicates the second refrigerant storage unit 63 and the third refrigerant storage unit 64.
- the refrigerant 5 functions as a lubricating oil for the entire rotary electric machine 1, but further, since the refrigerant 5 is also accumulated in the portion of the third refrigerant storage unit 64 where the power transmission mechanism 32 is provided, the refrigerant 5 is powered. It also functions as a lubricating oil for the transmission mechanism 32.
- the refrigerant 5 functions as a lubricating oil for the power transmission mechanism 32, so that power can be transmitted more efficiently.
- the power transmission mechanism 32 transmits power to the second shaft 31 in conjunction with the rotation of the first shaft 17.
- the second shaft 31, which receives power from the power transmission mechanism 32, rotates together with the impeller 30 provided on the second shaft 31. That is, the first gear 33a fixed to the first shaft 17 rotates in conjunction with the rotation of the first shaft 17, and the second gear 33b meshed with the first gear 33a via the groove is rotated. Since the second gear 33b is fixed to the second shaft 31, the second shaft 31 also rotates with the rotation of the second gear 33b, and the impeller 30 provided at the lower end of the second shaft 31 also rotates.
- the impeller 30 Since the impeller 30 is immersed in the refrigerant 5 in the first refrigerant storage unit 60, the impeller 30 starts pumping (sucking and discharging (pushing up the liquid level)) the refrigerant 5 in the drain unit 7 by the rotational operation of the impeller 30. That is, when the impeller 30 is rotated by the rotation of the first shaft 17, the refrigerant 5 around the impeller 30 stored in the first refrigerant storage unit 60 is swiveled, and the refrigerant suction port provided by the impeller cover is provided. The refrigerant 5 is sucked into the impeller 30.
- the refrigerant suction port of the impeller 30 is narrower than the width of the second refrigerant storage portion 63 by the impeller cover, the refrigerant 5 is sucked into the impeller 30.
- the refrigerant 5 sucked into the impeller 30 is swirled by the rotation of the impeller 30 and is subjected to centrifugal force to flow out to the outside of the impeller 30 in the radial direction.
- the refrigerant 5 flowing out of the impeller 30 passes through the side wall of the second refrigerant storage unit 63 and rises toward the third refrigerant storage unit 64.
- the refrigerant 5 stored in the drain portion 7 is discharged to the outside in the radial direction of the blades of the impeller 30, and the discharged refrigerant 5 is the second refrigerant storage unit 63 and the third refrigerant storage unit 64. It goes up to the upper part of the impeller 30 through the inner wall of the impeller 30.
- a pumping effect of raising the refrigerant 5 to at least the height of the first shaft 17 in the casing 8 can be obtained.
- the refrigerant 5 that has risen in the casing 8 due to the pumping effect generated by the rotational operation of the impeller 30 is guided to the third refrigerant storage unit 64 via the second refrigerant storage unit 63 and the communication hole 65.
- the refrigerant 5 guided to the third refrigerant storage unit 64 flows into the axial flow path 70 provided in the first shaft 17, and reaches the radial flow path 71. Since the radial flow path 71 is extended in the radial direction of the first shaft 17, when the rotor 18 starts rotating, the refrigerant 5 reaching the radial flow path 71 of the first shaft 17 has a centrifugal force. Be affected. By this centrifugal force, the refrigerant 5 can be guided from the axial flow path 70 on the downstream side to the radial flow path 71.
- the action of centrifugal force generated in the radial flow path 71 has a characteristic that it increases in proportion to the rotation speed of the rotor 18.
- the refrigerant 5 guided from the axial flow path 70 of the first shaft 17 to the radial flow path 71 of the first shaft 17 by the centrifugal force of the rotor 18 is formed by the non-output side end plate 16 and the rotor core 13. It flows into the non-output side end plate refrigerant flow path 26.
- the refrigerant 5 flowing into the non-output side end plate refrigerant flow path 26 receives centrifugal force due to the rotation of the rotary electric machine 1, and is provided in the non-output side ejection hole 24 and the rotor core 13 provided in the radial direction of the non-output side end plate 16. It splits into the magnet cooling hole 22.
- the refrigerant 5 ejected from the non-output side ejection hole 24 is sprayed on the stator core 10 and the coil 11 located on the radial outer side of the non-output side end plate 16. Since the ejected refrigerant 5 is directly supplied to the stator core 10 and the coil 11 that generate heat continuously, highly efficient cooling is possible.
- the refrigerant 5 flowing into the magnet cooling hole 22 advances to the output side of the rotary electric machine 1 in parallel with the first shaft 17 while directly cooling the heat-generating permanent magnet 14, and the output side end plate 15 and the rotor core 13 are connected to each other. It is guided to the output side end plate refrigerant flow path 25 provided between them. Also in the output side end plate refrigerant flow path 25, the refrigerant 5 is continuously subjected to centrifugal force and is ejected from the output side ejection hole 23 provided in the output side end plate 15. The ejected refrigerant 5 is sprayed on the stator core 10 and the coil 11 located on the radial outer side of the output side end plate 15 to cool the stator core 10 and the coil 11.
- the stator core 10 and the coil 11 that generate heat are generated in the rotation axis direction and the radial direction. It can be cooled uniformly without any bias. Furthermore, these series of channels have a large number of fluid resistances such as a large number of bends, throttles, and enlargements.
- the pumping effect generated in the radial flow path 71 in conjunction with the rotation of the first shaft 17 is also taken into consideration. It is possible to supply the refrigerant 5 to a predetermined flow path even if it has the fluid resistance of.
- the refrigerant 5 ejected from the output side ejection hole 23 and the non-output side ejection hole 24 falls to the lower part of the housing 2 due to the action of gravity.
- the refrigerant 5 that has fallen to the lower part of the housing 2 passes through the flow hole 9 that leads to the drain part 7 provided at the bottom of the housing 2 and is stored in the drain part 7. That is, the refrigerant 5 that has fallen due to the action of gravity is returned to the drain portion 7 through the flow hole 9.
- the flow of the refrigerant 5 inside the plate heat exchanger 41 which is a specific example of the heat exchanger 40, will be described.
- the refrigerant 5 that has flowed from the drain portion 7 into the second inflow / outflow direction switching mechanism 48 flows into the plate heat exchanger 41 through the refrigerant inflow / outflow hole 42 or the refrigerant inflow / outflow hole 43, and inside the plate heat exchanger 41.
- the refrigerant is supplied from the refrigerant flow path 49 of the first inflow / outflow direction switching mechanism 47 to the first refrigerant storage unit 60 and the impeller 30.
- the external refrigerant 6 flows in from the external refrigerant flow path 50 in the first inflow / outflow direction switching mechanism 47, and the external refrigerant 6 is the external refrigerant inflow / outflow hole 44 or the external refrigerant inflow / outflow hole of the plate heat exchanger 41.
- the refrigerant flows out from the second inflow / outflow direction switching mechanism 48 to the outside of the rotary electric machine 1.
- the refrigerant 5 supplied to the first refrigerant storage unit 60 and the impeller 30 then again passes through the axial flow path 70 and the radial flow path 71 in the first shaft 17, and the stator core 10 which is a heat generating unit, The coil 11 and the permanent magnet 14 are cooled.
- the refrigerant 5 that circulates inside the rotary electric machine 1 can be circulated by the rotational power of the rotor 18 of the rotary electric machine 1.
- the rotary electric machine 1 of the present disclosure is provided with a pumping mechanism for the refrigerant 5 provided with an impeller 30 driven by the rotational power of the rotor 18, so that the refrigerant 5 below the stator 12 can be easily pumped. , The refrigerant 5 is efficiently circulated, and the rotary electric machine 1 having excellent cooling performance can be obtained.
- FIG. 7 is a cross-sectional view of the rotary electric machine 1 of this modified example.
- the heat radiation fins 90 are attached to the outer surface of the housing 2 except the bottom surface.
- the heat radiating fin 90 dissipates heat by transferring the heat generated by the rotary electric machine 1 to the air outside the housing 2.
- the heat of the housing 2 can be efficiently radiated to the outside of the housing 2. Therefore, it is possible to promote heat exchange in the heat exchanger 40 by air cooling using the heat radiation fins 90.
- the rotary electric machine 101 even if the rotor 18 stops rotating by further providing the backflow prevention member 91 in the rotary electric machine 1 of the first embodiment. Since the refrigerant 5 can be prevented from flowing back from the third refrigerant storage portion 64, the heat generating portion can be appropriately cooled, and the rotary electric machine 101 having excellent cooling performance can be obtained.
- the throttle portion 92 in FIG. 10 is formed so that the radial flow path 71 has a shape in which the flow path cross-sectional area is smaller on the radial outer side than the radial inner flow path cross-sectional area.
- the outside of the radial flow path 71 that is, the outlet portion of the radial flow path 71 is narrowed down to function as a large pressure loss body.
- the throttle portion 92 from the non-output side end plate refrigerant flow path 26 formed by the non-output side end plate 16 and the rotor core 13 through which the radial flow path 71 communicates as the rotation speed of the rotor 18 increases. There is a concern that the backflow of air will occur and the pumping effect will not occur.
- the throttle portion 92 that narrows the vicinity of the outlet in the radial flow path 71, a large pressure increase occurs, so that the backflow of air from the radial flow path 71 can be suppressed.
- the impeller 30 includes blades 94 that are arranged at intervals in the circumferential direction of the second shaft 31 and have a surface perpendicular to the rotation direction of the impeller 30. Since the blade 94 has a surface perpendicular to the rotation direction of the impeller 30, it is possible to pump up the refrigerant regardless of the rotation direction of the rotor 18.
- the radial distance from the second shaft 31 to the outer peripheral edge portion 95 of the blade 94 is defined as the radial distance D.
- the radial distance D from the second shaft 31 to the outer peripheral edge of the blade 94 decreases toward the lower end of the second shaft 31. That is, the blade 94 is tapered from the second refrigerant storage unit 63 toward the first refrigerant storage unit 60.
Abstract
Description
図1は本開示の実施の形態1に示す回転電機1の断面図である。図2は図1の回転電機1のA-A断面を回転子の回転軸方向から見た断面図である。図3は図2の一部を拡大した図である。図4は図1の回転電機1のB-B断面を回転子の回転軸方向から見た断面図である。以下、図1~図4に基づいて、実施の形態1に係る回転電機の構成について説明する。
ステータコア10は、優れた磁気特性を有する薄い鋼板が、第一シャフト17の軸長方向に積層されることによって構成される。また、ステータコア10は周方向に所定の間隔を介して、径方向内側に突出して形成されたティース部(図示せず)を備えている。そのため、ステータコア10を第一シャフト17の軸長方向から見ると、π字形状のティース部が周方向に並んでいる。なお、ティース部はπ字形状ではなくT字形状となるように構成されていてもよい。コイル11は、ティース部、すなわち、ステータコア10のπ字形状の足に該当する部分に、第一シャフト17の径方向を軸として、導線が巻回されて構成される。巻回されている導線は、高い電気伝導率を有する銅製である。導線の断面形状は、円形であるが、平角形状であってもよい。なお、「軸長方向」とは、回転軸が延びている方向である。
ロータコア13は、円筒形であり、優れた磁気特性、すなわち、高い透磁率および小さな鉄損を有する薄い鋼板が、第一シャフト17の軸長方向に積層されることによって、形成される。また、出力側端板15および非出力側端板16は、金属で形成されるが、樹脂で形成されてもよい。金属であれば回転機の重量が重くなるが材料的強度、耐熱性が高い。一方で、出力側端板15および非出力側端板16は、樹脂製であれば強度面は金属製に劣るが、耐腐食性に優れていることに加えて回転機自体を軽量化できる。
第一シャフト17に設けられた流路は、第一シャフト17の軸長方向に設けられた軸方向流路70と、第一シャフト17の径方向に設けられた径方向流路71で構成されている。軸方向流路70は、第一シャフト17の軸長方向すなわち回転軸方向に沿って、非出力側の端部から第一シャフト17の途中まで冷媒5が流れるように設けられた流路であり、回転軸方向の断面が円形状の孔である。径方向流路71は、軸方向流路70と非出力側端板冷媒流路26とをつなぐ流路であり、第一シャフト17の中心から円筒表面に向かって放射状に延びている。図4では径方向流路71の一例として4本の流路を示しているが、1本以上の流路によって構成されていれば良い。
冷媒5の汲み上げ機構は、回転子18の回転動力を第二シャフト31に伝達する動力伝達機構32、冷媒5を吸い込む羽根車30、羽根車30の回転軸をなす第二シャフト31、これらを収容するケーシング8とから構成される。冷媒5の汲み上げ機構は、ドレイン部7の冷媒5をケーシング8内に設けられた熱交換器40に引き込み、冷却し、冷却した冷媒5を再び第一シャフト17の流路を経由してハウジング2内部の発熱部へ供給する。本開示では、冷媒5の汲み上げ機構に羽根車30を設けることによって、ハウジング2下部のドレイン部7にためられた冷媒5を少なくとも第一シャフト17の高さまで汲み上げ、回転電機1の内部にて循環させている。
そのため、本開示の冷媒5の汲み上げ機構のように羽根車30を設けることで、従来のポンプに比べて容易に羽根車30の上部へ汲み上げることが可能となる。すなわち、本開示の冷媒5の汲み上げ機構は、ハウジング2下部のドレイン部7に貯留された冷媒5をハウジング2内部の発熱部へ供給することができる。
図6では、第一流出入方向切替機構47の冷媒用流路49がプレート式熱交換器41の冷媒流出入孔43に接続する場合における各構成との接続の一例を示している。この場合、第二流出入方向切替機構48は、第二流出入方向切替機構48の冷媒用流路49がプレート式熱交換器41の冷媒流出入孔42に接続するように、第二流出入方向切替機構48の外部冷媒用流路50がプレート式熱交換器41の外部冷媒流出入孔44に接続するように、流路の接続を切り替える。
このように、第一流出入方向切替機構47および第二流出入方向切替機構48を設けたことで、外部冷媒6を、冷媒5と混じり合うことなく回転電機1の外部へ流出させることが可能となる。
羽根車30の回転動作により生じる汲み上げ効果によってケーシング8内を上昇した冷媒5は、第二冷媒貯留部63、連通孔65を経由して、第三冷媒貯留部64に導かれる。
ドレイン部7から第二流出入方向切替機構48へ流入した冷媒5は、冷媒流出入孔42または冷媒流出入孔43からプレート式熱交換器41内へ流入し、プレート式熱交換器41内部で外部冷媒6と熱交換した後に、第一流出入方向切替機構47の冷媒用流路49から第一冷媒貯留部60および羽根車30へ供給される。この際、第一流出入方向切替機構47内の外部冷媒用流路50から外部冷媒6が流入し、外部冷媒6は、プレート式熱交換器41の外部冷媒流出入孔44または外部冷媒流出入孔45を経由して、プレート式熱交換器41内部で冷媒5と熱交換した後に第二流出入方向切替機構48から、回転電機1外部へ流出される。第一流出入方向切替機構47および第二流出入方向切替機構48において、冷媒5は冷媒用流路49内を流通し、外部冷媒6は外部冷媒用流路50内を流通する。
本開示の実施の形態2における回転電機101について図8および図9を用いて説明する。なお、図8および図9中、図1と同一符号は同一又は相当部分を示す。この実施の形態2は、実施の形態1に係る回転電機1の第三冷媒貯留部に冷媒5の逆流防止部材91を設けた構成にしたものである。
本開示の実施の形態3に係る回転電機201について図10および図11を用いて説明する。なお、図10および図11中、図1と同一符号は同一又は相当部分を示す。この実施の形態3に係る回転電機201は、実施の形態1に係る回転電機1の径方向流路71の形状を変形したものである。そのため、実施の形態3に係る回転電機201の断面図(図示せず)は、図1に示す実施の形態1に係る回転電機1の断面図と同様である。
本開示の実施の形態4に係る回転電機301について図12、図13および図14を用いて説明する。なお、図12、図13および図14中、図1と同一符号は同一又は相当部分を示す。この実施の形態4に係る回転電機301は、実施の形態1に係る回転電機1の羽根車30及び羽根車カバー34の形状を変形したものである。また、実施の形態1と同様の構成及び動作の説明は省略する。
ここで、図14に示すように、第二シャフト31から羽根94の外周縁部95までの径方向の距離を径方向距離Dと定義する。本実施の形態4に係る羽根94は、第二シャフト31から羽根94の外周縁部までの径方向の距離Dが、第二シャフト31の下端に向かうにつれて減少する。すなわち、第二冷媒貯留部63から第一冷媒貯留部60に向かって、羽根94が先細りする形状である。
Claims (13)
- ハウジングと、
前記ハウジングに収容された固定子と、
前記固定子の内側で回転する回転子と、
前記回転子の回転軸方向にのびて前記回転子を貫通し、前記回転子とともに回転する第一シャフトと、
上下方向にのびる第二シャフトと、
前記第一シャフトの回転動力を前記第二シャフトに伝達する動力伝達機構と、
前記第二シャフトの下端に設置され、前記第二シャフトの回転により、前記ハウジング内で第一シャフトよりも低い位置にある冷媒を少なくとも第一シャフトの高さまで汲み上げる羽根車と、
前記第一シャフトの高さまで汲み上げられた前記冷媒を前記回転子及び前記固定子の発熱部に供給するための流路と、
を備えた回転電機。 - 前記ハウジングの底部に設けられ、前記冷媒を貯留するドレイン部と、
前記ハウジングの側面部に設けられ、前記ハウジングから突出する前記第一シャフトの一端部、前記第二シャフト及び前記動力伝達機構を収容するケーシングと、
前記冷媒を冷却する熱交換器と、
前記ケーシング内で前記第二シャフトの下端側に設けられ、前記熱交換器にて冷却された前記冷媒を貯留する第一冷媒貯留部と、
をさらに備えた請求項1に記載の回転電機。 - 前記熱交換器が、前記ハウジングの側面部に接するように前記ケーシングの底部に設けられた、請求項2に記載の回転電機。
- 前記動力伝達機構は、前記第一シャフトの一端部に設けられた第一歯車と、前記第二シャフトの一端部に設けられ、前記第一歯車と噛み合う第二歯車とを有する請求項3に記載の回転電機。
- 前記第一冷媒貯留部の上に、前記第二シャフトに沿って前記冷媒が上昇するための第二冷媒貯留部を有し、前記第一冷媒貯留部と前記第二冷媒貯留部との間に前記羽根車の前記冷媒の吸い込むための口が形成された羽根車カバーを備える、請求項2から4のいずれか一項に記載の回転電機。
- 前記ケーシングは、前記第一冷媒貯留部より上部を、前記第二冷媒貯留部と第三冷媒貯留部とに仕切り、前記第二冷媒貯留部と前記第三冷媒貯留部とを連通する連通孔が設けられた支持部材を備え、
前記第三冷媒貯留部には、前記回転子が回転を停止した場合に、前記冷媒の逆流を防止する逆流防止部材が設けられる請求項5に記載の回転電機。 - 前記第一シャフトは、前記第一シャフト内の回転軸方向に沿って設けられた軸方向流路と、前記軸方向流路に連通し、前記第一シャフトの径方向に貫通する径方向流路とを有する請求項2から請求項6のいずれか1項に記載の回転電機。
- 前記径方向流路は、径方向内側の流路断面積に対して、径方向外側に流路断面積が小さくなる形状を呈する請求項7に記載の回転電機。
- 前記径方向流路の端部は、前記回転電機の回転方向と逆方向に屈曲する請求項7または請求項8に記載の回転電機。
- 前記ハウジングの外面に取り付けられる放熱フィンをさらに備えた請求項2から請求項9のいずれか1項に記載の回転電機。
- 前記熱交換器は、前記冷媒の流路となる冷媒用流路と前記ケーシングの外部から流入する外部冷媒の流路となる外部冷媒用流路とを有し、前記冷媒と前記外部冷媒とを熱交換させる請求項2から請求項10のいずれか1項に記載の回転電機。
- 前記羽根車は、前記第二シャフトの周方向に互いに間隔を空けて配置され、前記羽根車の回転方向に対して垂直な面を有する羽根を備え、
前記羽根は、前記第二シャフトから前記羽根の外周縁部までの径方向の距離が、前記第二シャフトの下端に向かうにつれて減少する請求項2から請求項11のいずれか1項に記載の回転電機。 - 前記羽根車カバーは、前記羽根車が回転したときの前記羽根の前記外周縁部の軌跡に沿った形状である請求項5に従属する請求項12に記載の回転電機。
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WO2019098166A1 (ja) * | 2017-11-14 | 2019-05-23 | 日本電産株式会社 | モータユニット |
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JP2001238406A (ja) * | 1999-04-27 | 2001-08-31 | Aisin Aw Co Ltd | 駆動装置 |
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