JP2008029166A - Cooling structure for rotating electric machine and motor-driven turbocharger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling structure for a rotating electric machine which can efficiently cool a rotor, and a motor-driven turbocharger including this structure. <P>SOLUTION: The cooling structure of the rotating electric machine is provided with a rotor 310 having internal spaces 317. Holes 315 for communicating the internal spaces 317 to the outside of the rotor 310 are formed on the rotor 310. In this case, when the rotation speed of the rotor 310 is relatively high, the air in the internal spaces 317 is discharged from the holes 315 to the outside of the rotor 310, and when it is relatively low, the outside air of the rotor 310 is supplied into the internal spaces 317 via the holes 315. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine cooling structure and an electric supercharger, and more particularly to a rotating electrical machine cooling structure including a rotor having an internal space and an electric supercharger including the structure.

Conventionally, an electric supercharger having a rotating electric machine is known.
For example, Japanese Patent Publication No. 2001-527613 (Patent Document 1) includes an air pump that supplies air into a hollow shaft, and cools the shaft by supplying air even when the shaft is not rotating. Is disclosed.

  Japanese Patent Application Laid-Open No. 7-211961 (Patent Document 2) discloses a laser turbo blower in which a cooling oil passage is provided inside a shaft and the shaft and rotor are cooled by oil flowing in the passage.

  In Japanese Patent Laid-Open No. 2003-235210 (Patent Document 3), a refrigerant inlet and a refrigerant outlet are formed on a rotation center axis so as to communicate with an internal space provided on a rotary shaft, and the refrigerant is supplied from the refrigerant inlet. A cooling structure for a rotating body that supplies and discharges refrigerant from a refrigerant outlet is disclosed.

  In Japanese Patent Application Laid-Open No. 5-256155 (Patent Document 4), an increase in the temperature of the stator is detected when the rotating electrical machine is electrically driven, and when the temperature exceeds a predetermined temperature, oil is mixed with the air compressed by the air compressor, A protective device for a rotating electrical machine is disclosed in which a temperature rise is prevented by spraying on a rotor or the like.

In JP 2003-117768 A (Patent Document 5), compressed air supply means, oil mist forming means, piping means for guiding compressed air containing oil mist to a predetermined ejection position, and piping means An oil mist supply device having nozzle means provided at the tip is disclosed.
JP-T-2001-527613 JP 7-211961 A JP 2003-235210 A JP-A-5-256155 JP 2003-117768 A

  Depending on the usage environment and operating conditions of the rotating electrical machine, the rotor temperature of the rotating electrical machine may increase. If the temperature of the rotor of the rotating electrical machine rises excessively, for example, when a permanent magnet is provided in the rotor, the magnet may be demagnetized and the performance of the electric supercharger may not be ensured. Therefore, it is important to effectively cool the rotating electrical machine.

  However, in the structure described in Patent Document 1, only heat exchange is performed between the circulating air and the shaft, and sufficient cooling may not always be possible. Similarly, even with the structures described in Patent Documents 2 to 4, sufficient cooling may not always be performed. Further, the structure described in Patent Document 5 is not for cooling the rotating electrical machine.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a cooling structure for a rotating electrical machine capable of effectively cooling a rotor and an electric supercharger including the structure. It is to provide.

  In one aspect, a rotating electrical machine cooling structure according to the present invention includes a rotor having an internal space. A communication hole for communicating the internal space with the outside of the rotor is formed in the rotor. When the rotational speed of the rotor is relatively high, the air in the internal space is discharged from the communication hole to the outside of the rotor, and when the rotational speed of the rotor is relatively low, the rotor space enters the internal space via the communication hole. Of air is supplied.

  According to the above configuration, when the rotational speed of the rotor increases, the air in the internal space is released to the outside of the rotor through the communication hole. At this time, the adiabatic expansion action works, and the temperature of the internal space of the rotor decreases. As a result of the above, effective cooling of the rotor is performed.

  The “state where the rotational speed of the rotor is relatively low” includes a state where the rotor is not rotating.

  In the rotating electrical machine cooling structure, the communication hole is preferably provided on the outer peripheral surface of the rotor.

  On the outer peripheral surface of the rotor, the circumferential speed when the rotor rotates is the largest. Therefore, by providing the communication hole on the outer peripheral surface of the rotor, the pressure drop outside the communication hole becomes remarkable. As a result, since the adiabatic expansion due to the outflow of air through the communication hole can be promoted, the rotor can be effectively cooled.

  In the rotating electrical machine cooling structure, preferably, a plurality of communication holes are formed. Here, in one aspect, the plurality of communication holes are formed at symmetrical positions with respect to the axial center of the rotor, and in another aspect, the plurality of communication holes are formed so as to be arranged at equal intervals in the circumferential direction of the rotor. .

  Thereby, the rotor can be cooled while ensuring a sufficient balance of the rotor during rotation.

  In another aspect, a cooling structure for a rotating electrical machine according to the present invention includes a rotor having an internal space and a compressed air supply unit that ejects compressed air, and communicates the internal space with the outside of the rotor. Two communication holes are formed in the rotor, the first communication hole is provided on the outer side in the radial direction of the rotor than the second communication hole, and the compressed air supply section ejects compressed air toward the second communication hole To do.

  According to the above configuration, air is supplied from the second communication hole to the internal space of the rotor, and the air in the internal space is discharged to the outside of the rotor through the first communication hole. At this time, the rotor is effectively cooled by the adiabatic expansion action at the compressed air supply section and the adiabatic expansion action at the portion where air is released from the internal space.

  In the cooling structure for the rotating electric machine, preferably, the second communication hole is provided on the end surface in the axial direction of the rotor, and the first communication hole is provided on the outer peripheral surface of the rotor.

  On the outer peripheral surface of the rotor, the circumferential speed when the rotor rotates is the largest. Therefore, by providing the first communication hole for releasing the air in the internal space on the outer peripheral surface of the rotor, the pressure drop outside the first communication hole becomes remarkable. As a result, since adiabatic expansion due to the outflow of air through the first communication hole can be promoted, the rotor can be effectively cooled.

  In the cooling structure for a rotating electric machine, preferably, a plurality of first and second communication holes are formed. In one aspect, the plurality of first and second communication holes are respectively formed at symmetrical positions with respect to the axial center of the rotor, and in another aspect, the plurality of first and second communication holes are respectively rotors. Are arranged at equal intervals in the circumferential direction.

  Thereby, the rotor can be cooled while ensuring a sufficient balance of the rotor during rotation.

  In the cooling structure of the rotating electric machine, preferably, the compressed air supply unit includes an ejector that mixes oil and air, and compressed air including oil mist is ejected toward the second communication hole.

  According to the above configuration, air including oil mist can be generated with a simple configuration, and the cooling effect can be enhanced by the oil mist.

  The cooling structure for the rotating electric machine preferably further includes a stator having a coil end, and air is discharged from the first communication hole toward the coil end.

Thereby, cooling of the coil end of a stator can be performed.
An electric supercharger according to the present invention is a compressor wheel that is a wheel on the intake side, a turbine wheel that is a wheel on the exhaust side, a rotation shaft connected to the compressor wheel and the turbine wheel, and a rotation shaft fixed to the rotation shaft The rotating electrical machine cooling structure described above is applied to the rotating electrical machine.

According to the said structure, the electric supercharger in which the rotary electric machine was cooled efficiently is provided.
In the electric supercharger, preferably, the compressed air compressed by the compressor wheel is ejected toward the second communication hole.

  Thereby, compressed air is ejected toward the 2nd communicating hole, without providing the apparatus for obtaining compressed air separately.

  According to the present invention, it is possible to effectively cool the rotating electrical machine.

  Embodiments of the present invention will be described below. Note that the same or corresponding portions are denoted by the same reference numerals, and the description thereof may not be repeated.

  Note that in the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In the following embodiments, each component is not necessarily essential for the present invention unless otherwise specified. In addition, when there are a plurality of embodiments below, it is planned from the beginning to appropriately combine the features of each embodiment unless otherwise specified.

  FIG. 1 is a diagram showing a schematic configuration of a system in which a rotating electrical machine to which a rotating electrical machine cooling structure according to Embodiments 1 to 3 of the present invention is applied is assembled to an engine with a turbocharger (electric supercharger). . As shown in FIG. 1, the system includes an engine 100 including an intake pipe 110 and an exhaust pipe 120, a turbocharger 200 including wheels in the intake pipe 110 and the exhaust pipe 120, and a coaxial arrangement with the turbocharger 200. The magnet-type electric motor 300, the inverter 400, and the ECU 500 that controls the entire system are configured. The magnet type electric motor 300 is an electric motor having a rotor in which a magnet is arranged on the outer peripheral portion of a rotating shaft.

In the system shown in FIG. 1, a turbine wheel 121 that is a wheel on the exhaust pipe 120 side is rotated by exhaust energy discharged from the engine 100, and a compressor wheel 111 that is a wheel on the intake pipe 110 side is rotated by this power. Let By doing in this way, compressed air can be supplied to the engine 100 and filling efficiency can be improved. In the above system, the turbine shaft for connecting the turbine wheel 121 and the compressor wheel 111 is forcibly rotated by the magnet-type electric motor 300 when the exhaust energy is not sufficient. Electric power to the magnet type electric motor 300 is supplied from the inverter 400. ECU 500 controls the operation of inverter 400.

  The exhaust pipe 120 is provided with a bypass that bypasses the turbine wheel 121. A waste gate valve 130 is disposed in the vicinity of the bypass inlet. When there is no need for supercharging, the waste gate valve 130 is opened.

  As described above, the electric superchargers according to the first to third embodiments are provided in the compressor wheel 111 that is the intake side wheel, the turbine wheel 121 that is the exhaust side wheel, the compressor wheel 111, and the turbine wheel 121. A turbine shaft as a connected “rotating shaft” and a magnet-type electric motor 300 as a “rotating electric machine” including a rotor fixed to the turbine shaft are provided.

(Embodiment 1)
FIG. 2 is a sectional view of a rotor to which the rotating electrical machine cooling structure according to the first embodiment is applied. 3 is a cross-sectional view taken along line III-III in FIG.

  2 and 3, a rotor 310 to which the cooling structure according to the present embodiment is applied is a rotor included in magnet-type electric motor 300 (see FIG. 1), and includes tubular member 311 and magnet 312. And an end plate 313, a sleeve 314, a hole 315, and an internal space 317.

  The rotor 310 is fixed to the turbine shaft 210. The tubular member 311 is made of a nonmagnetic material such as titanium, for example. The magnet 312 is provided on the inner peripheral side of the tubular member 311. The end plate 313 as the “insertion member” is made of a nonmagnetic material such as titanium, for example, and is inserted into the tubular member 311 together with the magnet. The sleeve 314 is made of a nonmagnetic material such as titanium, for example, and is provided on both sides of the tubular member 311 in the axial direction. An internal space 317 is formed between the sleeve 314, the tubular member 311, and the end plate 313. A hole 315 is formed between the sleeve 314 and the tubular member 311. By forming the hole 315, the internal space 317 and the outside of the rotor 310 communicate with each other. The hole 315 is provided on the outer peripheral surface of the rotor 310.

  During the operation of the electric supercharger described above, the temperature of the rotor 310 increases. As a factor of the temperature rise of the rotor 310, for example, heat of the turbine wheel 121 exposed to a high temperature is transmitted to the rotor 310 via the turbine shaft 210. Here, when the temperature of the rotor 310 rises to the thermal demagnetization limit temperature of the magnet 312 provided in the rotor 310, the magnet 312 is demagnetized, and the performance of the electric supercharger cannot be ensured. Concerned. Even if the temperature of the rotor 310 is equal to or lower than the demagnetizing temperature of the magnet 312, the magnetic force of the magnet 312 is dominated by the temperature coefficient specific to the material. There is concern about the decline. Therefore, it is important to effectively cool the rotor 310 during operation of the electric supercharger.

  During the operation of the electric supercharger, the rotor 310 rotates at a high speed (for example, about 200,000 rpm) together with the turbine shaft 210. Thus, when the rotor 310 rotates at a high speed, the flow velocity in the vicinity of the outlet of the hole 315 increases, and the pressure in that portion significantly decreases (Bernoulli's theorem). Thereby, an adiabatic expansion action works on the air confined in the internal space 317. As a result, the temperature inside the rotor 310 decreases. When the rotor 310 is stopped or is rotating at a low speed, air flows from the outside of the rotor 310 into the internal space 317 through the hole 315. Thus, in the present embodiment, by providing communication hole 315, rotor 310 can be cooled using the adiabatic expansion action when rotor 310 rotates at high speed. In addition, in order to produce the above-mentioned adiabatic expansion action more effectively, the turbine shaft 210, the end plate 313, and the sleeve 314 are fitted so as not to cause air leakage.

  By the way, on the outer peripheral surface of the rotor 310, the circumferential speed at the time of rotor rotation becomes the largest. Therefore, by providing the hole 315 on the outer peripheral surface of the rotor 310, the pressure decrease outside the hole 315 becomes significant. As a result, since the adiabatic expansion due to the outflow of air through the hole 315 can be promoted, the rotor 310 can be effectively cooled.

  2 and 3, a plurality of hole portions 315 are formed. As shown in FIG. 2, the plurality of holes 315 are formed at symmetrical positions with respect to the axial center of the rotor 310. As shown in FIG. 3, the plurality of holes 315 are formed so as to be arranged at equal intervals in the circumferential direction of the rotor 310. By doing so, the rotor 310 can be cooled while ensuring a sufficient balance of the rotor 310 during rotation.

  According to the cooling structure for a rotating electrical machine according to the present embodiment, air in internal space 317 is discharged to the outside of rotor 310 through hole 315 when the rotational speed of rotor 310 increases. When the air in the internal space 317 is released to the outside of the rotor 310, adiabatic expansion occurs. As a result, the temperature of the internal space 317 decreases. As a result of the above, effective cooling of the rotor 310 is performed.

  In the cooling structure for the rotating electrical machine according to the present embodiment, the pressure on the outside of the hole 315 is reduced by providing the hole 315 on the outer peripheral surface of the rotor 310 where the circumferential speed during rotation of the rotor is maximized. Becomes prominent. As a result, adiabatic expansion due to the outflow of air through the hole 315 can be promoted.

  In the cooling structure for a rotating electrical machine according to the present embodiment, a plurality of hole portions 315 are formed at symmetrical positions with respect to the axial center of rotor 310, and the plurality of hole portions 315 are arranged at equal intervals in the circumferential direction of rotor 310. By forming in this way, the rotor 310 can be cooled while ensuring a sufficient balance of the rotor 310 during rotation.

  The above configuration is summarized as follows. That is, the rotating electrical machine cooling structure according to the present embodiment includes a rotor 310 having an internal space 317. Further, a hole portion 315 is formed in the rotor 310 as a “communication hole” that allows the internal space 317 to communicate with the outside of the rotor 310. Here, when the rotational speed of the rotor 310 is relatively high, the air in the internal space 317 is discharged from the hole 315 to the outside of the rotor 310, and when the rotational speed of the rotor 310 is relatively low, the hole Air outside the rotor 310 is supplied to the internal space 317 via the 315.

(Embodiment 2)
FIG. 4 is a diagram illustrating a cooling structure for a rotating electrical machine according to the second embodiment.

  Referring to FIG. 4, the rotating electrical machine cooling structure according to the present embodiment is a modification of the rotating electrical machine cooling structure according to the first embodiment, and a hole 316 is formed on the axial end surface of rotor 310. One feature is that it is provided. An injection nozzle 115 is provided at a position facing the hole 316, and compressed air is injected from the injection nozzle 115 toward the hole 316.

  As shown in FIG. 4, the compressed air compressed in the compressor housing 112 that houses the compressor wheel 111 is cooled by the intercooler 113 and supplied to the engine 100 via the intake pipe 110. Here, a branch pipe reaching the injection nozzle 115 is provided in the intake pipe 110. A switching valve 114 that allows / blocks the flow of compressed air toward the injection nozzle 115 is installed in the branch pipe.

  Air injected from the injection nozzle 115 is supplied to the internal space 317 via the hole 316. Air in the internal space 317 is discharged to the outside of the rotor 310 through the hole 315. Thus, in the present embodiment, an air circulation path is formed in the internal space 317 of the rotor 310.

  When compressed air is ejected from the ejection nozzle 115, the air adiabatically expands, and thus its temperature decreases. The cooled air is supplied to the internal space 317 of the rotor 310, whereby the rotor 310 is cooled. The temperature of the air that has passed through the internal space 317 slightly rises due to the heat of the rotor 310, but when the air is discharged to the outside of the rotor 310 through the hole 315, the flow path is restricted by the hole 315. Is released at once, the air adiabatically expands again. As a result, cooling of the rotor 310 is further promoted, and the cooled air is released to the outside of the rotor 310. Here, by cooling the outlet of the hole 315 toward the stator 320 including the stator core 321 and the stator coil 322 (particularly the coil end of the stator coil 322), cooling of the stator 320 (stator coil 322) can be promoted.

  In the present embodiment, as shown in FIG. 4, hole 316 is provided on the axial end surface of rotor 310, and hole 315 is provided on the outer peripheral surface of rotor 310.

  On the outer peripheral surface of the rotor 310, the circumferential speed during the rotation of the rotor 310 is the largest. Therefore, by providing the hole 315 for releasing the air in the internal space 317 on the outer peripheral surface of the rotor 310, the pressure drop outside the hole 315 becomes significant. As a result, since the adiabatic expansion due to the outflow of air through the hole 315 can be promoted, the rotor 310 can be effectively cooled.

  The compressed air is ejected from the ejection nozzle 115 by opening the switching valve 114. As one control method, the temperature of the rotor 310 during operation of the electric supercharger may be monitored, and when the rotor temperature exceeds a certain temperature, the switching valve 114 is opened and compressed air is ejected. The temperature of the rotor 310 is detected by measuring the temperature of the magnet 312 in the rotating rotor 310 from the induced voltage. As another control method, it is conceivable to monitor the rotational speed of the rotor 310 and open the switching valve 114 to eject compressed air when the rotational speed of the rotor exceeds a certain value.

  In FIG. 4, one hole 315 and one hole 316 are illustrated at both ends of the rotor 310, but the holes 315 and 316 are actually illustrated in FIG. 5 (V in FIG. 4). -V sectional view). That is, a plurality of (two) holes 315 and 316 are formed at both ends of the rotor 310.

  As shown in FIG. 4, the plurality of hole portions 315 and 316 are formed at positions symmetrical with respect to the axial center of the rotor 310. Further, as shown in FIG. 5, the plurality of holes 315 and 316 are formed so as to be arranged at equal intervals in the circumferential direction of the rotor. By doing so, the rotor 310 can be cooled while ensuring a sufficient balance of the rotor 310 during rotation.

  6 is a cross-sectional view taken along the line VI-VI in FIG. As shown in FIG. 6, the hole 316 has an axial direction of the rotor 310 (in the direction of the arrow DR <b> 1) so that a constant rotational force (F) can be applied to the rotor 310 by the injection of air from the injection nozzle 115. Is formed so as to intersect at a constant angle (θ).

  According to the cooling structure for a rotating electrical machine according to the present embodiment, air is supplied from the injection nozzle 115 to the internal space 317 of the rotor 310 through the hole 316, and the air in the internal space passes through the hole 315. Released to the outside. At this time, the rotor 310 is effectively cooled by the adiabatic expansion action at the injection nozzle 115 and the adiabatic expansion action at the portion where air is released from the internal space 317.

  Further, by ejecting the compressed air compressed by the compressor wheel 111 toward the hole 316, the compressed air can be ejected toward the hole 316 without providing a separate device for obtaining the compressed air. .

  The above configuration is summarized as follows. That is, the rotating electrical machine cooling structure according to the present embodiment includes a rotor 310 having an internal space 317 and an injection nozzle 115 as a “compressed air supply unit” that ejects compressed air. Further, hole portions 315 and 316 as “first and second communication holes” for communicating the internal space 317 and the outside of the rotor 310 are formed in the rotor, and the hole portion 315 is in the radial direction of the rotor more than the hole portion 316. Provided outside. The jet nozzle 115 jets compressed air toward the hole 316.

(Embodiment 3)
FIG. 7 is a diagram showing a cooling structure for a rotating electrical machine according to the third embodiment. Referring to FIG. 7, the rotating electrical machine cooling structure according to the present embodiment is a modification of the rotating electrical machine cooling structure according to the second embodiment, and an ejector 115 </ b> A is provided upstream of injection nozzle 115. It is characterized by that. The ejector 115 </ b> A sucks oil and oil mist scattered in the supercharger and mixes them with the compressed air supplied from the compressor housing 112. Then, air mixed with oil mist is ejected from the ejection nozzle 115 toward the hole 116. That is, in the cooling structure according to the present embodiment, the “compressed air supply unit” includes an ejector 115A that mixes oil and air, and compressed air containing oil mist is ejected toward the hole 316.

  According to the rotating electrical machine cooling structure according to the present embodiment, air containing oil mist can be ejected toward hole 316 with a simple configuration. When the air injected toward the hole 316 contains oil mist, the cooling effect of the coil ends of the rotor 310 and the stator coil 322 can be enhanced.

  Although the embodiment of the present invention has been described above, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows schematic structure of the system which assembled | attached the rotary electric machine with which the cooling structure of the rotary electric machine which concerns on Embodiment 1-3 of this invention is applied to the engine with a turbocharger. It is sectional drawing of the rotor to which the cooling structure of the rotary electric machine which concerns on Embodiment 1 of this invention is applied. It is the III-III sectional view in FIG. It is a figure which shows the cooling structure of the rotary electric machine which concerns on Embodiment 2 of this invention. It is VV sectional drawing in FIG. It is VI-VI sectional drawing in FIG. It is a figure which shows the cooling structure of the rotary electric machine which concerns on Embodiment 3 of this invention.

Explanation of symbols

  100 Engine, 110 Intake pipe, 111 Compressor wheel, 112 Compressor housing, 113 Intercooler, 114 Switching valve, 115 Injection nozzle, 115A Ejector, 120 Exhaust pipe, 121 Turbine wheel, 130 Wastegate valve, 200 Turbocharger, 210 Turbine shaft , 300 Magnet type electric motor, 310 rotor, 311 tubular member, 312 magnet, 313 end plate, 314 sleeve, 315, 316 hole, 317 internal space, 320 stator, 321 stator core, 322 stator coil, 400 inverter, 500 ECU.

Claims (12)

A rotor having an internal space;
A communication hole for communicating the internal space with the outside of the rotor is formed in the rotor,
In a state where the rotational speed of the rotor is relatively high, air in the internal space is discharged from the communication hole to the outside of the rotor, and in a state where the rotational speed of the rotor is relatively low, the air passes through the communication hole. A cooling structure for a rotating electrical machine in which air outside the rotor is supplied to the internal space.   The cooling structure for a rotating electrical machine according to claim 1, wherein the communication hole is provided on an outer peripheral surface of the rotor. A plurality of the communication holes are formed,
The cooling structure for a rotating electrical machine according to claim 1, wherein the plurality of communication holes are formed at positions symmetrical with respect to an axial center of the rotor. A plurality of the communication holes are formed,
The cooling structure for a rotating electrical machine according to any one of claims 1 to 3, wherein the plurality of communication holes are formed so as to be arranged at equal intervals in a circumferential direction of the rotor. A rotor having an internal space;
A compressed air supply section for jetting compressed air;
First and second communication holes for communicating the internal space with the outside of the rotor are formed in the rotor,
The first communication hole is provided radially outward of the rotor from the second communication hole,
The rotating structure of the rotating electrical machine, wherein the compressed air supply section ejects compressed air toward the second communication hole.   The cooling structure for a rotating electrical machine according to claim 5, wherein the second communication hole is provided on an end surface in the axial direction of the rotor, and the first communication hole is provided on an outer peripheral surface of the rotor. A plurality of the first and second communication holes are formed,
7. The cooling structure for a rotating electrical machine according to claim 5, wherein the plurality of first and second communication holes are formed at positions symmetrical with respect to an axial center of the rotor. A plurality of the first and second communication holes are formed,
The cooling structure for a rotating electrical machine according to any one of claims 5 to 7, wherein the plurality of first and second communication holes are formed so as to be arranged at equal intervals in a circumferential direction of the rotor. The compressed air supply unit includes an ejector for mixing oil and air,
The rotating electrical machine cooling structure according to any one of claims 5 to 8, wherein compressed air containing oil mist is jetted toward the second communication hole. A stator having a coil end;
The cooling structure for a rotating electrical machine according to any one of claims 1 to 9, wherein air is discharged from the first communication hole toward the coil end. A compressor wheel which is a wheel on the intake side;
A turbine wheel that is an exhaust side wheel;
A rotating shaft connected to the compressor wheel and the turbine wheel;
A rotating electric machine including a rotor fixed to the rotating shaft,
An electric supercharger in which the rotating electrical machine cooling structure according to any one of claims 1 to 10 is applied to the rotating electrical machine.   The electric supercharger according to claim 11, wherein compressed air compressed by the compressor wheel is jetted toward the second communication hole.

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