JP2019154115A - Cooling system for rotary electric machine, and rotary electric machine with the same - Google Patents

Abstract

An object of the present invention is to provide a cooling system for a rotating electric machine which prevents contamination of lubricating oil and prevents ground faults, and a rotating electric machine provided with the same. A cooling system for an electric rotating machine includes an ATF lubricating oil for cooling a motor and a generator of the electric rotating machine: a cooling circuit in which a refrigerant flows, and oil supply pipes; An oil filter 70 that removes contamination of the ATF refrigerant in the flow path. The oil filter 70 is installed on the front side of the first side cover 41 of the housing 40 housing the rotating electric machine 3. [Selection diagram] FIG.

Description

  The present invention relates to a rotating electrical machine cooling system and a rotating electrical machine including the same.

A hybrid vehicle is equipped with an engine (internal combustion engine) and a traveling motor as a traveling power source, and achieves highly efficient traveling by appropriately using both or one of them.
In a hybrid vehicle having a generator and an electric motor, cooling of the stator side coil is performed by dropping a refrigerant such as ATF (Automatic Transmission Fluid) that also serves as gear lubrication of the transmission onto the stator side coil of the generator and the electric motor. Has been done.

  Further, a rotating electrical machine used as a power source for a hybrid vehicle or an electric vehicle is required to be small and have high output. For example, Patent Document 1 proposes an arrangement in which the first assembly conductor and the in-slot conductors of the second assembly conductor are arranged in order of increasing potential in the slots of the stator core. According to the technique described in Patent Document 1, since the potential difference in the in-slot conductor portion can be kept low, the thickness of the insulating coating necessary for insulating the in-slot conductor portion can be reduced. Therefore, it is said that the space factor (hereinafter simply referred to as space factor) of the conducting wire in the stator core slot can be increased, and the rotating electrical machine can be reduced in size or increased in output.

JP 2010-178458 A

  However, in consideration of further reducing the film thickness, when cooling a stator having a winding structure in which conductors without insulation film (bare conductor) and conductors with insulation film (current conductor) are alternately arranged, There is a possibility that fine conductor contamination (contamination, hereinafter referred to as contamination) enters the refrigerant. If the contamination is laminated between the bare conductor and the current conductor, a ground fault may occur.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a cooling system for a rotating electrical machine that prevents contamination of lubricating oil and prevents ground faults, and a rotating electrical machine including the same.

  In order to solve the above-described problem, the cooling system for a rotating electrical machine according to claim 1 includes a coolant path through which a coolant that cools the rotating electrical machine flows, and a coolant that removes contamination of the coolant in the flow path of the coolant path. The refrigerant filter is installed on the surface side of a case containing the rotating electrical machine.

  ADVANTAGE OF THE INVENTION According to this invention, the cooling system of the rotary electric machine which prevents contamination of lubricating oil and prevents a ground fault, and a rotary electric machine provided with the same can be provided.

It is a see-through | perspective perspective view of the hybrid vehicle by which the cooling system of the rotary electric machine which concerns on embodiment of this invention is mounted. It is a schematic perspective view of the cooling system of the rotary electric machine after oil filter attachment concerning the embodiment of the present invention. It is a schematic perspective view of the cooling system of the rotary electric machine before oil filter attachment concerning the embodiment of the present invention. It is a block diagram which shows the outline | summary of the cooling system of the rotary electric machine which concerns on this embodiment. It is a figure which shows attachment of the filter plate to the case processing surface of the cooling system of the rotary electric machine which concerns on this embodiment, (a) is a figure which shows application | coating of the thermal radiation grease to a case processing surface, (b) is a filter plate It is a figure which shows the installation to the case processed surface. It is a figure which shows the structure of the filter plate and oil filter of the cooling system of the rotary electric machine which concerns on this embodiment, (a) is the perspective view, (b) is the sectional drawing, (c) is the principal part sectional drawing. is there.

Next, a cooling system for a rotating electrical machine according to an embodiment of the present invention and a rotating electrical machine including the same will be described in detail with reference to the drawings as appropriate. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.
FIG. 1 is a perspective view of a hybrid vehicle equipped with a rotating electrical machine cooling system according to an embodiment of the present invention. FIG. 2 is a schematic perspective view of the cooling system for the rotating electrical machine after the oil filter is attached, and FIG. 3 is a schematic perspective view of the cooling system for the rotating electrical machine before the oil filter is attached.
In the hybrid vehicle 1 shown in FIG. 1, an engine 2 and a rotating electrical machine 3 (motor and generator), which are power sources for traveling, include a driving force switching device 4 incorporating a differential device and a power unit 6 together with an automatic transmission 5. It is configured and mounted horizontally between the front wheels 8. The hybrid vehicle 1 has a cooling system 7 that cools the rotating electrical machine 3. The hybrid vehicle 1 may be a vehicle other than the hybrid vehicle as long as it has the rotating electrical machine 3 as a cooling target and the cooling system 7 for cooling the rotating electrical machine 3.

FIG. 4 is a block diagram showing an outline of the cooling system 7. The cooling system 7 cools the stator core 11 and the coil 12 of the motor stator 10 and the stator core 21 and the coil 22 of the generator stator 20 with ATF (lubricating oil: refrigerant). The cooling system 7 may be disposed adjacent to the rotating electrical machine 3 and cool parts (for example, gears and bearings) of a transmission (not shown) that can be connected to the rotating electrical machine 3.
As shown in FIG. 4, the cooling system 7 includes an ATF cooler (radiator) 31, a cooling circuit 32 (cooling line: refrigerant path), and a housing 40 (case). The cooling circuit 32 includes oil supply pipes 50 and 51 (described later). In addition, the symbol of resistance in FIG. 4 has shown thermal resistance.

  The cooling system 7 includes a cartridge type oil filter 70 (described later) for removing contamination in the flow path of the cooling circuit 32 (cooling line). In the present embodiment, the oil filter 70 is installed on the oil supply pipe 50 (cooling line: refrigerant path) on the discharge side of the ATF cooler 31. The oil filter 70 may be installed anywhere in the flow path of the cooling circuit 32.

The mechanical oil pump 30 circulates the ATF, and is a mechanical pump that generates an output depending on the rotation of the engine. The mechanical oil pump 30 may be another pump (for example, an electric pump) as long as it can circulate the ATF.
The ATF cooler 31 radiates ATF. As shown in FIG. 1, the ATF cooler 31 is provided in a part of the front bumper 33 of the hybrid vehicle 1. Thereby, when the hybrid vehicle 1 travels, the travel air (cooling air) from the radiator side section hits the ATF cooler 31, thereby cooling the ATF. It is only necessary that the ATF can be cooled, and the ATF cooler 31 may be disposed in another part.

As shown in FIG. 4, the cooling circuit 32 circulates ATF along the path indicated by the arrow C. The cooling circuit 32 includes a plurality of pipes (not shown), a space in the housing 40, and the like. The coils 12 and 22 are cooled by dripping ATF into the coils 12 and 22 on the stator side of the rotating electrical machine 3 through each pipe.
Further, as indicated by the broken line in the oil filter 70 (refrigerant filter) in FIG. 4, the oil filter 70 is installed in the flow path of the cooling circuit 32 (cooling line), and ATF contamination is removed.

<Housing 40>
The housing 40 houses the rotating electrical machine 3 (motor and generator), has a function of protecting the rotating electrical machine 3, and serves as a coolant case (for example, an oil pan) that accumulates ATF after the rotating electrical machine 3 is cooled. It has the function of.
As shown in FIGS. 2 and 3, the housing 40 includes a first side cover 41 that is an anti-load side case cover and a second side cover 42 that is a load side case cover.
An oil supply pipe 50 (cooling line: refrigerant path) is connected to the side surface of the first side cover 41, and the oil supply pipe 50 is connected to the oil filter 70 and the ATF cooler 31 through the oil filter 70. Is connected to one end. The other end of the ATF cooler 31 is connected to an oil discharge pipe 51 (cooling line) below the second side cover 42, and the ATF of a hydraulic circuit (not shown) of the automatic transmission 5 is connected to the rotating electrical machine 3 (motor and motor). Generator).
As described above, an oil reservoir (not shown) for storing ATF supplied from the oil supply pipe 50 is formed in the lower part of the internal space of the housing 40. Further, the ATF in the oil sump is returned to the hydraulic circuit of the automatic transmission 5 through the oil discharge pipe 51.

<Case processing surface 41a>
The first side cover 41 forms the end of the housing 40. The first side cover 41 is cut so that the end portion is a flat case processing surface 41a. The case processing surface 41a is an attachment portion for the filter plate 60 (described later).
The case processing surface 41 a is formed in a circular shape in accordance with the disk shape of the filter plate 60. The case processing surface 41 a is orthogonal to the axial direction of the shaft of the rotating electrical machine 3, and the center thereof is aligned with the axial direction of the shaft of the rotating electrical machine 3.

  By setting the end portion of the first side cover 41 to be a flat case processing surface 41a, the first side cover 41 can be installed so that the back surface of the filter plate 60 is in close contact with the case processing surface 13a. Since the case processing surface 41a of the first side cover 41 and the back surface of the filter plate 60 are in surface contact with each other over a wide range, the heat of the housing 40 can be radiated to the filter plate 60 side. As will be described later, even higher heat dissipation can be achieved by applying heat dissipation grease 45 (described later) to the case processing surface 41a.

  Further, since the filter plate 60 is installed so as to be in close contact with the case processing surface 41a of the first side cover 41, the vibration of the housing 40 can be dispersed to the filter plate 60 side to reduce the vibration. The center of the case processing surface 41a is the axial direction of the shaft of the rotating electrical machine 3, and is the main vibration location of the housing 40 (the vibration portion of the case). Since the filter plate 60 is installed at this vibration location, the vibration of the entire system can be reduced by increasing the weight of the filter plate 60. The reduction in vibration has the effect of reducing case vibration noise.

<Filter plate 60>
FIG. 5 is a diagram illustrating attachment of the filter plate 60 to the case processing surface 13a.
As shown in FIG. 5 (a), the heat treatment grease 45 is applied to the case processing surface 13a, and as shown in FIG. 5 (b), the filter plate 60 is applied to the case processing surface 41a via the heat treatment grease 45. Installed. As described above, the center of the case processing surface 41a (the axis center of the shaft of the rotating electrical machine 3) and the center of the disk-shaped filter plate 60 are aligned. Any means such as fastening means may be used to install the filter plate 60 on the case processing surface 13a.

6A and 6B are diagrams showing the configuration of the filter plate 60 and the oil filter 70, in which FIG. 6A is a perspective view thereof, FIG. 6B is a sectional view thereof, and FIG. It is.
The filter plate 60 is a mounting plate for fixing the oil filter 70, and is made of, for example, Al or an Al alloy. By making the filter plate 60 made of Al, it is possible to obtain high heat dissipation and vibration reduction due to a moderate weight increase.
The filter plate 60 has a function of radiating the heat of the housing 40 to the filter plate 60 side, and a function of being installed on the case processing surface 41a of the first side cover 41 to increase the weight of the vibration part and reduce the vibration. Also have.

  As shown in FIG. 6, the filter plate 60 has a circular plate 61 for fixing the oil filter 70, and rises in the axial direction of the shaft of the rotating electrical machine 3 from the peripheral portion of the circular plate 61, and is further L-shaped in the outer peripheral direction. And an annular flange portion 62 (heat radiation extending portion) that is bent and extended, and a cooling fin 63 (heat radiation extending portion) provided on the outer peripheral side of the annular flange portion 62.

The circular plate 61 has an annular flange portion 62 formed on the outer periphery on the front side, and a bottom portion (not shown) of the cylindrical portion 71 of the oil filter 70 is fixed to the center portion. By disposing the oil filter 70 at the center of the circular plate 61, when the annular flange 62 is formed on the outer peripheral side, the height of the oil filter 70 can be suppressed. The fixing may be performed by any means, for example, the bottom of the cylindrical portion 71 of the oil filter 70 may be fixed with screws.
The back side of the circular plate 61 is installed on the case processing surface 41 a of the first side cover 41.

  The annular flange portion 62 has a structure in which a plurality of (three in the present embodiment) cooling fins 63 are installed by rising from the peripheral portion of the circular plate 61 at a predetermined height in the axial direction of the shaft of the rotating electrical machine 3. The space to do is secured.

  The cooling fins 63 cool the filter plate 60 with traveling air (cooling air). As shown by the arrow in FIG. 6C, the cooling fin 63 is set to an angle that provides the maximum contact area with respect to the flow of the traveling air (cooling air). The traveling wind includes traveling wind from the radiator side part and traveling wind flowing from the lower part of the engine room.

<Oil filter 70>
As shown in FIGS. 1 to 4, the oil filter 70 is installed on an oil supply pipe 50 (cooling line: refrigerant path), and removes contamination in the ATF flow path by filtration or adsorption. The oil filter 70 includes a cylindrical portion 71 that accommodates a cartridge-type oil filter (not shown), and a lid portion 72 that is screwed and mounted on the upper portion of the cylindrical portion 71 to replace the cartridge-type oil filter. By opening the lid 72, the cartridge type oil filter can be replaced. The bottom of the oil filter 70 is fixed (for example, fixed by a fastening means) to the center of the surface of the circular plate 61 of the filter plate 60.
As shown in FIGS. 1 to 3, an oil supply pipe 50 is attached to a side surface portion of the cylindrical portion 71. Contamination is removed from the ATF (lubricating oil: refrigerant) flowing into the oil filter 70 from one oil supply pipe 50 by the cartridge type oil filter, and the ATF from which the contamination has been removed is discharged from the other oil supply pipe 50. .

  As described above, the cooling system 7 for the rotating electrical machine 3 according to the present embodiment includes the cooling circuit 32 and the oil supply pipes 50 and 51 (through which ATF (lubricating oil: refrigerant) that cools the rotating electrical machine 3 (motor and generator) flows. A cooling line (refrigerant path) and an oil filter 70 for removing ATF (refrigerant) contamination in the flow path of the cooling circuit 32. The oil filter 70 is provided in the housing 40 (case) in which the rotating electrical machine 3 is built. Installed on the front side of the first side cover 41.

  With this configuration, the ATF (refrigerant) after passing through the ATF cooler 31 flows through the oil filter 70 once and then flows into each lubricating part and cooling part in the housing 40. The amount of contamination in the flow path of the cooling line can be reduced so as not to cause a ground fault. In particular, when cooling a stator that is made up of alternating non-insulated conductors (bare conductors) and insulating film conductors (current conductors), contamination in the refrigerant is laminated between the bare conductors and the current conductor, causing a ground fault. Can be prevented in advance. Further, since damage to the winding is reduced, application to a thin film coil is also possible.

The oil filter 70 is in contact with the filter plate 60 having the annular flange portion 62 and the cooling fins 63 (heat radiation extending portions), and is installed on the case processing surface 41 a of the first side cover 41 of the housing 40. The cooling fin 63 is set to an angle that provides a maximum contact area with respect to the flow of the traveling wind.
With this configuration, the traveling air (cooling air) cools the filter plate 70 by traveling air from the radiator side portion and traveling air flowing from the lower part of the engine room. Since the filter plate 60 with enhanced cooling function is installed on the case processing surface 41a of the first side cover 41, the heat of the housing 40 can be radiated to the filter plate 60 side. As a result, the temperature of ATF (lubricating oil: refrigerant) can be reduced, and thermal degradation of ATF can be prevented.

  Further, since the filter plate 60 is installed so as to be in close contact with the case processing surface 41a of the first side cover 41, the vibration of the housing 40 can be distributed to the filter plate 60 side to reduce the vibration, and the case vibration sound can be reduced. can do.

  Moreover, in this embodiment, since the filter plate 60 is installed in the case processing surface 41a via the heat dissipation grease 45, higher heat dissipation can be achieved.

  Further, in the present embodiment, the oil filter 70 is disposed in contact with the center side of the filter plate 60, so that the annular flange portion 62 and the cooling fin 63 (heat radiation) are disposed on the outer peripheral side while suppressing the height of the oil filter 70. Extension part) can be formed.

  In the present embodiment, the cooling system 7 for the rotating electrical machine 3 is installed in the hybrid vehicle 1, and at least the oil filter 70 is disposed in an area that can be cooled by the traveling wind of the hybrid vehicle 1. The attached filter plate 60 can be efficiently cooled by the traveling wind.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted based on the content described in this specification.
For example, the oil filter 70 may be installed at any location in the cooling circuit 32 and the oil supply pipes 50 and 51 (cooling line).

  In the above embodiment, the hybrid vehicle 1 is described as the cooling structure. However, the structure is not limited to this as long as the rotating electric machine 3 (motor and generator) is provided and the structure needs to be cooled. For example, the hybrid vehicle 1 may be an electric vehicle or a fuel cell vehicle that does not have an engine and uses only a motor as a drive source.

DESCRIPTION OF SYMBOLS 1 Hybrid vehicle 3 Rotating electric machine 7 Cooling system 10 Motor stator 20 Generator stator 30 Mechanical oil pump 31 ATF cooler 32 Cooling circuit (cooling line)
33 Front bumper 40 Housing (case)
41 1st side cover 41a Case processing surface 42 2nd side cover 45 Radiation grease 50, 51 Oil supply pipe (cooling line)
60 Filter plate 61 Circular plate 62 Ring flange (heat dissipation extension)
63 Cooling fin (heat dissipation extension)
70 Oil filter 71 Cylindrical part 72 Lid part

Claims (5)

A refrigerant path through which a refrigerant for cooling the rotating electrical machine flows;
A refrigerant filter that removes contamination of the refrigerant in the refrigerant path;
The refrigerant filter is:
A cooling system for a rotating electrical machine, wherein the cooling system is installed on a surface side of a case containing the rotating electrical machine. The refrigerant filter is:
The cooling system for a rotating electrical machine according to claim 1, wherein the cooling system is in contact with a filter plate having a heat radiating extension and is disposed on a surface side of the case. The filter plate is
It has the heat dissipation extension on the outer periphery,
The refrigerant filter is:
The cooling system for a rotating electrical machine according to claim 2, wherein the cooling system is disposed in contact with a center side of the filter plate. Installed in the vehicle,
The cooling system for a rotating electrical machine according to claim 1, wherein at least the refrigerant filter is disposed in an area that can be cooled by running wind of the vehicle. A refrigerant path through which a refrigerant for cooling the stator flows;
A refrigerant filter that removes contamination of the refrigerant in the refrigerant path;
The refrigerant filter is:
A rotating electrical machine, wherein the rotating electrical machine is installed on a surface side of a case containing the stator.

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