JP2018170941A - Rotary electric machine unit and cooling system of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electrical machine unit and a cooling system for the same, capable of effectively cooling a stator by enabling cooling with a second coolant in addition to cooling with a first coolant.SOLUTION: The rotary electric machine unit includes: a rotary electric machine 10 having a stator 12 and a rotor 11 and accommodated in a housing 13; a first coolant supply unit 14 that supplies a first coolant to a first coolant flow path 29 formed in the housing 13 to cool the stator 12; and a second coolant supply unit 15 having a second coolant flow path 30 extending in an axial direction across the first coolant flow path 29, for supplying a second coolant to the second coolant flow path 30 and cooling the stator 12 by supplying the second coolant toward a stator coil 24 of the stator 12 from both sides of the second coolant flow path 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating electrical machine unit and a cooling system for the rotating electrical machine unit.

  2. Description of the Related Art Conventionally, a rotating electrical machine unit is known that includes a stator around which a stator coil is wound, a rotating electrical machine having a rotor arranged in a non-contact manner on the inner periphery of the stator, and a housing that houses the rotating electrical machine. As such a rotating electrical machine unit, for example, one disclosed in Patent Document 1 is known. In the rotating electrical machine unit disclosed in this document, a water passage is formed in a housing that houses the rotating electrical machine, a stator core of the rotating electrical machine is press-fitted into a holder, and an oil passage is formed between the housing and the holder.

JP 2010-283929 A

By the way, when the stator core is directly press-fitted into the housing, it is not possible to install an oil cooling pipe or the like in the axial direction. Therefore, it is general to use a water cooling type using a water channel of the housing.
However, in the water-cooled type, the stator core is directly cooled, but the stator coil is not directly cooled, so that the cooling capacity is lower than that in the oil-cooled type.

  Therefore, the present invention provides a rotating electrical machine unit and a cooling system for the rotating electrical machine unit that can cool the stator effectively by enabling the cooling by the second coolant in addition to the cooling by the first coolant.

As a means for solving the above problems, the present invention includes a housing, a stator and a rotor, and supplies the first refrigerant to the rotating electrical machine accommodated in the housing and the first refrigerant flow path formed in the housing. The first refrigerant supply section that cools the stator and the second refrigerant flow path that extends so as to straddle the first refrigerant flow path in the axial direction, and the second refrigerant flow to the second refrigerant flow path A rotating electrical machine unit comprising: a second refrigerant supply unit that cools the stator by supplying the second refrigerant from both sides of the second refrigerant channel toward the stator coil of the stator. I will provide a.
According to this configuration, the first refrigerant (for example, cooling water) is supplied to the first refrigerant flow path of the housing by the first refrigerant supply unit, so that the stator can be cooled (water cooled) with the first refrigerant. In addition, the second refrigerant (for example, cooling oil) is supplied to the stator coil through the second refrigerant channel that extends in the axial direction across the first refrigerant channel, thereby cooling the stator with the second refrigerant ( Oil cooling). Thereby, according to the temperature rise of a stator, it becomes possible to cool by a 2nd refrigerant | coolant in addition to the cooling by a 1st refrigerant | coolant, and can cool a stator effectively.
In the present invention, the second refrigerant flow path may include an outer peripheral flow path forming portion fixed in contact with the outer peripheral surface of the housing.
According to this configuration, the outer peripheral flow path forming portion can be assembled to the housing after the stator core is press-fitted into the housing, and the second refrigerant flow path can be reliably formed without being restricted by thermal conditions.
In the present invention, the second refrigerant supply unit is fixed in contact with a side surface of the housing that protrudes in the axial direction from the stator core of the stator in the housing, and allows the second refrigerant to be dropped onto the stator coil. It is good also as a structure provided with the refrigerant | coolant dripping part.
According to this configuration, the second refrigerant dropping portion can be assembled to the housing after the stator core is press-fitted into the housing, and the second refrigerant flow path can be reliably formed without being restricted by thermal conditions. Moreover, a stator can be effectively cooled by dripping a 2nd refrigerant | coolant to the coil end of a stator coil from the 2nd refrigerant | coolant dripping part arrange | positioned in the position protruded in the axial direction from the stator core.
In the present invention, the second refrigerant supply unit is fixed in contact with a side surface of the housing that protrudes in the axial direction from the stator core of the stator in the housing, and allows the second refrigerant to be dropped onto the stator coil. It is good also as a structure provided with the refrigerant | coolant dripping part.
According to this configuration, the second refrigerant dropping portion can be assembled to the housing after the stator core is press-fitted into the housing, and the second refrigerant flow path can be reliably formed without being restricted by thermal conditions. Moreover, a stator can be effectively cooled by dripping a 2nd refrigerant | coolant to the coil end of a stator coil from the 2nd refrigerant | coolant dripping part arrange | positioned in the position protruded in the axial direction from the stator core.
In the present invention, the second refrigerant dropping section may include a circumferential flow path extending in the circumferential direction.
According to this configuration, the second refrigerant can be dropped onto the stator coil in a wide range in the circumferential direction through the circumferential flow path extending in the circumferential direction.
In the present invention, the first refrigerant supply unit and the second refrigerant supply unit may include independent refrigerant supply units.
According to this structure, since the 1st refrigerant | coolant supply part which supplies a 1st refrigerant | coolant, and the 2nd refrigerant | coolant supply part which supplies a 2nd refrigerant | coolant are mutually independent, according to the load state of a rotary electric machine, both are separately provided. It can be driven.

In addition, the present invention provides any one of the above rotating electrical machine units, a load state detection unit that detects a load state of the rotating electrical machine, and a second refrigerant supply adjustment unit that adjusts the refrigerant flow rate of the second refrigerant supply unit. And a control device for controlling the second refrigerant supply adjusting means in accordance with the load state detected by the load state detecting means.
According to this configuration, cooling by the second refrigerant can be performed in addition to the cooling by the first refrigerant in accordance with the load state of the rotating electrical machine.
In the present invention, the control device adjusts the refrigerant flow rate of the second refrigerant supply unit by switching on / off driving of the second refrigerant supply adjusting means, and has a hysteresis in a threshold used for switching of the on / off driving. It is good also as a structure which has.
According to this configuration, when the on / off drive of the second refrigerant supply adjusting means is switched according to the load state of the rotating electrical machine (when switching on / off of cooling by the second refrigerant), the on / off drive switching trigger is By having hysteresis in the threshold value, it is possible to prevent on / off switching within the hysteresis range and to prevent frequent switching of the second refrigerant supply adjusting means in the vicinity of the threshold value.
Further, in the present invention, the control device adjusts the refrigerant flow rate of the second refrigerant supply unit by switching on / off driving of the second refrigerant supply adjusting means, and switches the on / off driving to the rotation. It is good also as a structure performed according to switching of the operation mode of an electric machine.
According to this configuration, whether or not oil cooling with the second refrigerant is switched according to the operation mode of the rotating electrical machine, for example, only cooling with the first refrigerant is performed in the low output operation mode, and the first cooling is performed in the high output operation mode. The stator can be efficiently cooled according to the load state of the rotating electrical machine, such as cooling with the second refrigerant in addition to cooling with the refrigerant.

  According to the present invention, it is possible to provide a rotating electrical machine unit and a cooling system for the rotating electrical machine unit capable of effectively cooling a stator by enabling cooling by a second coolant in addition to cooling by a first coolant. Can do.

It is a schematic cross section of the rotating electrical machine unit and the cooling system of the rotating electrical machine unit in the embodiment of the present invention. It is II-II sectional drawing of FIG. It is a graph which shows the time change of the stator temperature in the cooling system of the said rotary electric machine unit and a rotary electric machine unit. It is a flowchart which shows the outline of the control in the cooling system of the said rotary electric machine unit and a rotary electric machine unit. It is a graph which shows the relationship of the drive torque and rotation speed of a rotary electric machine unit and rotary electric machine unit in 2nd embodiment of this invention, and is a graph which shows two operation modes.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, the rotating electrical machine unit 1 includes a rotating electrical machine 10 that includes a rotor 11 and a stator 12, and a housing 13 that houses the rotating electrical machine 10. For example, the rotating electrical machine unit 1 is used as a power source for a vehicle. Hereinafter, a direction along the rotation center of the rotating electrical machine 10 is referred to as an axial direction, a direction orthogonal to the axial direction is referred to as a radial direction, and a direction along the rotation direction is referred to as a circumferential direction. Reference sign CL indicates the rotation center axis of the rotating electrical machine 10.

  The rotating electrical machine unit 1 includes a first refrigerant supply unit 14 that mainly cools the stator core 12a of the stator 12, and a second refrigerant supply unit 15 that cools the axial end (coil end) of the stator coil 24 mainly. And.

  The first refrigerant supply unit 14 mainly cools the stator core 12 a in contact with the inner peripheral surface of the housing 13 by supplying cooling water as the first refrigerant to the first refrigerant flow path 29 formed in the housing 13.

  The second refrigerant supply unit 15 includes a second refrigerant flow path 30 that extends so as to straddle the first refrigerant flow path 29 in the axial direction. The second refrigerant supply unit 15 supplies the cooling oil supplied as the second refrigerant to the second refrigerant channel 30 from the axial ends of the stator coil 24 of the stator 12 from both axial sides of the second refrigerant channel 30 ( The stator coil 24 is mainly cooled by supplying toward the coil end.

  The first refrigerant supply unit 14 and the second refrigerant supply unit 15 include independent refrigerant supply units. That is, the first refrigerant supply unit 14 includes a water pump 34, and the second refrigerant supply unit 15 includes an oil pump 32.

  The cooling system 2 of the rotating electrical machine unit 1 includes the rotating electrical machine unit 1, a rotation speed sensor 16 and a temperature sensor 17 as examples of “load state detection means”, and an oil pump as an example of “second refrigerant supply adjustment means”. 32, the switching valve 35, and the control device 20 that controls the second refrigerant supply adjusting means based on the detection information of the load state detecting means.

  The rotor 11 has a cylindrical yoke 21 in which a plurality of magnetic plates are stacked in the axial direction. A through hole 22 is formed in the central portion of the yoke 21 in the radial direction, and a shaft 23 that is a drive shaft of the rotating electrical machine 10 is fixed to the through hole 22. On the outer peripheral portion of the yoke 21, permanent magnets (not shown) that are alternately magnetized with opposite polarities in the circumferential direction are arranged. The rotor 11 is provided with a magnetic element (not shown) for detecting the rotational position and an optical encoder.

  The stator 12 is disposed outside the rotor 11 without contact. The stator 12 has a cylindrical stator core 12a in which a plurality of magnetic plate materials are laminated in the axial direction. The stator core 12a forms a stator coil 24 by winding windings around a plurality of teeth protruding radially inward and arranged in the circumferential direction. The outer peripheral surface of the stator core 12 a is press-fitted and fixed to the inner peripheral surface of the housing 13. The stator coil 24 is connected to a PDU (Power Drive Unit) (not shown).

  The housing 13 is made of, for example, aluminum die cast, and has a cylindrical shape with a closed end in the axial direction. In the housing 13, a bearing 27 is assembled at the center of an end cap 26 provided at both ends of the cylindrical portion 25. A shaft 23 is rotatably supported by the bearing 27.

  A double tubular flow path forming portion 28 is formed in the cylindrical portion 25 of the housing 13. An annular first refrigerant flow path 29 is formed inside the flow path forming section 28 along the circumferential direction of the first refrigerant supply section 14. A water pump 34 that circulates the first refrigerant is connected to the first refrigerant channel 29 via a water channel 38. The flow path forming portion 28 and the first refrigerant flow path 29 are thermally connected to the stator core 12a.

  An outer peripheral flow path forming portion 33 is in contact with the outer peripheral surface 13a of the housing 13, and is fixed by bolt fastening or the like. An axial flow path 33 a extending in the axial direction of the second refrigerant flow path 30 is formed inside the outer peripheral flow path forming portion 33.

  The flow path forming portion 28 has a protruding portion 28a that protrudes outward in the axial direction from the stator core 12a. A second refrigerant dropping portion 31 that allows the second refrigerant to drip on the stator coil 24 is in contact with the outer surface 28b of the protruding portion 28a, and is fixed by bolt fastening or the like. The second refrigerant dripping portion 31 is made of, for example, a synthetic resin, has an arc shape when viewed in the axial direction, and is fixed to the outer surface 28 b of the flow path forming portion 28 by a bolt 37.

  A circumferential flow path 31 a extending in the circumferential direction of the second refrigerant flow path 30 is formed in the second refrigerant dropping portion 31. An axial end of the axial flow path 33a is connected to the circumferential flow path 31a via a radial flow path 33b extending in the radial direction. The circumferential flow path 31a has, for example, a plurality of dropping holes 31b, and the second refrigerant can be dropped into the stator coil 24 from the dropping holes 31b.

  An oil pump 32 that supplies the second refrigerant is connected to the second refrigerant flow path 30 via an oil path 36. The cooling oil supplied from the oil pump 32 to the second refrigerant flow path 30 reaches the circumferential flow path 31a from both sides of the axial flow path 33a, and is supplied to the stator coil 24 from the dropping hole 31b.

  The part that forms the second refrigerant flow path 30 is arranged away from the stator core 12 a in the housing 13 in the radial direction and the axial direction. Since the outer peripheral flow path forming portion 33 and the second refrigerant dropping portion 31 which are parts forming the second refrigerant flow path 30 are not involved in the press-fitting of the stator core 12a into the housing 13, the assembly to the housing 13 after the press-fitting of the stator core 12a is performed. Can be done.

The rotation speed sensor 16 is a rotation speed detector such as an encoder, and detects the rotation speed of the shaft 23. This rotational speed information is sent to the control device 20.
The temperature sensor 17 is disposed, for example, inside the housing 13 and detects the temperatures of the rotor 11 and the stator 12. This temperature information is sent to the control device 20.

The switching valve 35 is provided in the middle of the oil passage 36 and switches the cross-sectional area of the oil passage 36 by on / off driving.
A valve driving unit 18 and a pump driving unit 19 are connected to the switching valve 35 and the oil pump 32 as individual drivers.

The valve drive unit 18 adjusts the flow rate of the second refrigerant flowing through the oil passage 36 by driving the switching valve 35 on and off. The valve driving unit 18 is electrically connected to the control device 20.
The pump drive unit 19 drives the oil pump 32 so as to have a specified discharge flow rate. The pump drive unit 19 is electrically connected to the control device 20.

  The control device 20 performs arithmetic processing based on the rotational speed information obtained from the rotational speed sensor 16 and the temperature information obtained from the temperature sensor 17, and controls at least one of the valve drive unit 18 and the pump drive unit 19. The control device 20 adjusts the flow rate of the second refrigerant (and hence the supply amount to the stator coil 24) by driving at least one of the switching valve 35 and the oil pump 32. The control device 20 is connected to a rotary electric machine 10 and thus a mode changeover switch 39 for switching the operation mode of the vehicle.

  As shown in FIG. 3, the rotating electrical machine 10 starts to drive the rotor 11 when the driving power is supplied from the PDU (timing t <b> 1 in the drawing). After the rotary electric machine 10 is started, the stator 12 is cooled (water-cooled) only by the first refrigerant until the stator temperature reaches the timing t2 when the stator temperature exceeds the threshold value th1.

  When the stator temperature exceeds the threshold th1 at timing t2, the control device 20 drives the switching valve 35 to increase the flow rate of the second refrigerant. Thereby, in addition to the stator 12 being cooled by the first refrigerant, the stator coil 24 is cooled by the second refrigerant dropped from the second refrigerant dropping portion 31, so that the stator 12 is cooled by the first refrigerant and the second refrigerant. Cooling (water cooling + oil cooling).

  Thereafter, when the stator temperature starts to fall and falls below the threshold value th2 at timing t3, the control device 20 controls the drive of the switching valve 35 to decrease the flow rate of the second refrigerant. Thereby, the cooling of the stator 12 by the second refrigerant is eliminated, and the stator 12 is returned to the state of cooling by the first refrigerant alone. The control device 20 may be configured to control the drive of at least one of the switching valve 35 and the oil pump 32 to increase or decrease the flow rate of the second refrigerant.

  The control device 20 increases or decreases the flow rate of the second refrigerant by switching the on / off drive of the switching valve 35 (or the oil pump 32), and has a hysteresis HY as a threshold when the on / off drive is switched. ing. The threshold value is a prescribed value of the stator temperature. When the stator temperature exceeds the threshold value, the flow rate of the second refrigerant is increased, and when the stator temperature falls below the threshold value, the flow rate of the second refrigerant is decreased. By having the hysteresis HY in this threshold, the upper limit threshold th1 is used when the stator temperature rises and the flow rate of the second refrigerant is increased, and when the stator temperature is lowered and the flow rate of the second refrigerant is reduced. The lower limit threshold th2 is used.

  In FIG. 3, the vertical axis is the stator temperature, but the vertical axis is the rotational speed of the rotating electrical machine 10, and a threshold value for switching the on / off drive is set to this rotational speed. It is possible to obtain an effect.

  Next, an example of processing performed by the control device 20 will be described with reference to the flowchart of FIG. This control flow is repeatedly executed at a predetermined control cycle when the power is ON (main switch is ON).

  As shown in FIG. 4, when the rotating electrical machine 10 is started, first, the stator temperature is monitored in step S101. Next, in step S102, it is determined whether the stator temperature exceeds a threshold value. If NO in step S102 (the stator temperature is equal to or lower than the threshold value), control is performed to stop the supply of cooling oil by stopping the oil pump 32 or closing the switching valve 35 in step S103. That is, when oil cooling of the stator 12 is unnecessary, only water cooling is performed, and the stator 12 can be efficiently cooled.

  On the other hand, if YES in step S102 (the stator temperature exceeds the threshold value), in step S104, the oil pump 32 is started and the switching valve 35 is opened to control the supply of cooling oil. That is, the stator 12 can be cooled by water cooling + oil cooling, and the stator 12 can be effectively cooled. Note that the refrigerant flow rate can be adjusted by drive control of only one of the oil pump 32 and the switching valve 35.

  As described above, the rotating electrical machine unit 1 in this embodiment includes the housing 13, the stator 12, and the rotor 11, the rotating electrical machine 10 accommodated in the housing 13, and the first formed in the housing 13. By supplying the first refrigerant to the refrigerant channel 29, the first refrigerant supply unit 14 that cools the stator 12, and the second refrigerant channel that extends so as to straddle the first refrigerant channel 29 in the axial direction. 30 and supplying the second refrigerant to the second refrigerant channel 30 and supplying the second refrigerant from both sides of the second refrigerant channel 30 toward the stator coil 24 of the stator 12. , And a second refrigerant supply unit 15 that cools the stator 12.

  According to this configuration, the first refrigerant supply unit 14 supplies the first refrigerant (for example, cooling water) to the first refrigerant flow path 29 of the housing 13, thereby cooling (water cooling) the stator 12 with the first refrigerant. be able to. In addition, the second refrigerant (for example, cooling oil) is supplied to the stator coil 24 through the second refrigerant flow path 30 that extends in the axial direction across the first refrigerant flow path 29, so that the stator is made of the second refrigerant. 12 can be cooled (oil-cooled). Thereby, according to the temperature rise of the stator 12, in addition to the cooling with the first refrigerant, the cooling with the second refrigerant can be performed, and the stator 12 can be effectively cooled.

In the present embodiment, the second refrigerant flow path 30 includes an outer peripheral flow path forming portion 33 fixed in contact with the outer peripheral surface 13 a of the housing 13.
According to this configuration, the outer peripheral flow path forming portion 33 can be assembled to the housing 13 after the stator core 12a is press-fitted into the housing 13, and the second refrigerant flow path 30 is reliably formed without being restricted by thermal conditions. can do.

In the present embodiment, the second refrigerant supply unit 15 is fixed in contact with a housing side surface (outer surface 28 b) protruding in the axial direction from the stator core 12 a of the stator 12 in the housing 13, and is fixed to the stator coil 24. A second refrigerant dropping section 31 that allows two refrigerants to be dropped is provided.
According to this configuration, it is possible to assemble the second refrigerant dripping portion 31 into the housing 13 after press-fitting the stator core 12a into the housing 13, and to reliably form the second refrigerant flow path 30 without being restricted by thermal conditions. can do. Moreover, the stator 12 can be effectively cooled by dripping the second refrigerant to the coil end of the stator coil 24 from the second refrigerant dropping portion 31 arranged at a position protruding in the axial direction from the stator core 12a. .

In the present embodiment, the second refrigerant dropping section 31 includes a circumferential flow path 31a extending in the circumferential direction.
According to this configuration, the second refrigerant can be dropped onto the stator coil 24 in a wide range in the circumferential direction through the circumferential flow path 31a extending in the circumferential direction.

In the present embodiment, the first refrigerant supply unit 14 and the second refrigerant supply unit 15 include independent refrigerant supply units (water pump 34, oil pump 32).
According to this configuration, the first refrigerant supply unit 14 that supplies the first refrigerant and the second refrigerant supply unit 15 that supplies the second refrigerant are independent of each other. Can be driven individually.

Further, the cooling system 2 of the rotating electrical machine unit 1 according to the present embodiment includes the rotating electrical machine unit 1 described above and a load state detection unit (a temperature sensor 17, a rotational speed sensor) that detects a load state of the rotating electrical machine 10. 16), the second refrigerant supply adjusting means (switching valve 35, oil pump 32) for adjusting the refrigerant flow rate of the second refrigerant supply section 15, and the second state according to the load state detected by the load state detecting means. And a control device 20 that controls the refrigerant supply adjusting means.
According to this configuration, cooling by the second refrigerant can be performed in addition to the cooling by the first refrigerant according to the load state of the rotating electrical machine 10.

In the present embodiment, the control device 20 adjusts the refrigerant flow rate of the second refrigerant supply unit 15 by switching on / off driving of the second refrigerant supply adjusting means, and also uses it for switching of the on / off driving. The threshold value has a hysteresis HY.
According to this configuration, when switching the on / off drive of the second refrigerant supply adjusting means according to the load state of the rotating electrical machine 10 (when switching on / off of cooling by the second refrigerant), the on / off drive switching trigger By having hysteresis HY in the threshold value, it is possible to prevent on / off switching within the range of hysteresis HY and to prevent frequent switching of the second refrigerant supply adjusting means in the vicinity of the threshold value. it can.

Here, the control device 20 may be configured to switch on / off driving of the switching valve 35 (or the oil pump 32) in accordance with switching of the operation mode of the rotating electrical machine 10.
As shown in FIG. 5, when the operation mode is switched to the first mode C <b> 1 with a relatively low output such as the urban area mode, the rotational speed of the rotating electrical machine unit 1 is low and the driving torque is also low. For this reason, the cooling of the rotating electrical machine 10 is only water cooling with the first refrigerant.

  When the operation mode is switched to the relatively high output second mode C2 such as the sport mode, the rotational speed of the rotating electrical machine 10 is high and the driving torque is also high. For this reason, the cooling of the rotating electrical machine 10 is added with oil cooling with the second refrigerant in addition to water cooling with the first refrigerant.

In the example described above, the control device 20 adjusts the refrigerant flow rate of the second refrigerant supply unit 15 by switching on / off driving of the second refrigerant supply adjusting means, and switches the on / off driving. This is performed according to switching of the operation mode of the rotating electrical machine 10.
According to this configuration, since whether to cool with the second refrigerant is switched according to the operation mode of the rotating electrical machine 10, for example, only the cooling with the first refrigerant is performed in the low output operation mode, and the first in the high output operation mode. The stator 12 can be efficiently cooled according to the load state of the rotating electrical machine 10 such as cooling with the second refrigerant in addition to cooling with the refrigerant.

The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention. For example, as a means for detecting the load of the rotating electrical machine 10, in addition to the rotational speed sensor 16 and the temperature sensor 17, a power sensor for detecting the power supplied to the stator coil 24, a torque sensor for detecting the driving torque of the rotating electrical machine 10, etc. May be used.
And the structure in the said embodiment is an example of this invention, A various change is possible in the range which does not deviate from the summary of invention.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine unit 2 Cooling system of rotating electrical machine unit 10 Rotating electrical machine 11 Rotor 12 Stator 13 Housing 14 1st refrigerant | coolant supply part 15 2nd refrigerant | coolant supply part 16 Rotational speed sensor (load state detection means)
17 Temperature sensor (load state detection means)
18 Valve drive (second refrigerant supply adjustment means)
19 Pump drive (second refrigerant supply adjusting means)
20 control device 29 first refrigerant flow path 30 second refrigerant flow path 31 second refrigerant dropping portion C1 first mode C2 second mode

Claims (8)

A housing;
A rotating electrical machine having a stator and a rotor and housed in the housing;
A first refrigerant supply unit that cools the stator by supplying a first refrigerant to a first refrigerant flow path formed in the housing;
The second refrigerant flow path is extended so as to straddle the first refrigerant flow path in the axial direction, the second refrigerant is supplied to the second refrigerant flow path, and the second refrigerant flow path from both sides of the second refrigerant flow path A rotating electrical machine unit comprising: a second refrigerant supply unit that cools the stator by supplying the second refrigerant toward a stator coil of the stator. The rotating electrical machine unit according to claim 1, wherein the second refrigerant flow path includes an outer peripheral flow path forming portion fixed in contact with the outer peripheral surface of the housing. The second refrigerant supply unit includes a second refrigerant dropping unit that is fixed in contact with a side surface of the housing that protrudes in the axial direction from the stator core of the stator in the housing, and that allows the second refrigerant to drip onto the stator coil. The rotating electrical machine unit according to claim 1 or 2. 4. The rotating electrical machine unit according to claim 3, wherein the second refrigerant dripping portion includes a circumferential flow path extending in a circumferential direction. The rotating electrical machine unit according to any one of claims 1 to 4, wherein the first refrigerant supply unit and the second refrigerant supply unit include independent refrigerant supply units. A rotating electrical machine unit according to any one of claims 1 to 5,
Load state detecting means for detecting a load state of the rotating electrical machine;
Second refrigerant supply adjusting means for adjusting the refrigerant flow rate of the second refrigerant supply unit;
And a control device for controlling the second refrigerant supply adjusting means according to the load state detected by the load state detecting means. The control device adjusts a refrigerant flow rate of the second refrigerant supply unit by switching on / off driving of the second refrigerant supply adjusting means, and has a hysteresis in a threshold used for switching of the on / off driving. The cooling system for a rotating electrical machine unit according to claim 6. The control device adjusts the refrigerant flow rate of the second refrigerant supply unit by switching on / off driving of the second refrigerant supply adjusting means, and switches the on / off driving to the operation mode of the rotating electrical machine. The cooling system for a rotating electrical machine unit according to claim 6 performed according to the above.

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