JP2009303356A - Rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating electrical machine which effectively sends cooling wind to a brush and a slip ring, and which can effectively discharge brush wear powder. <P>SOLUTION: The rotating electrical machine is provided with a stator 5, having an armature coil 5a, a rotator 10 which is fixed to a rotation axis 1 and has a field core 2 and a field winding wire 3, the slip ring 4 for supplying field current to the field winding wire 3 and the brush 8 which is fixed to the rear-side of housings 6 and 7 and supplies field current to the field winding wire 3 via the slip ring 4. Cooling fans 20 and 21 making cooling wind flow to the brush 8 and the slip ring 4 in an axial direction are installed, at a position on the rear side, as compared to the slip ring 4 of the rotation axis 1 or the position on a front-side, as compared to the slip ring 4 of the rotation axis 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structure of a rotating electrical machine having a brush and a slip ring.

  Conventionally, for example, in a field winding type rotating electrical machine, a field current is supplied through a brush fixed to a rear bracket and a slip ring attached to a rotating shaft. In this case, since the fixed brush and the rotating slip ring are in contact with each other, the brush and the slip ring are heated to a high temperature due to friction between the two and the brush life is shortened. Further, abrasion powder of the brush or slip ring is generated, and a short circuit and ground fault due to the abrasion powder have been problems.

  In a conventional rotating electrical machine, cooling air from cooling fans attached to both sides of a field core is used to cool a brush or slip ring and discharge brush wear powder. At this time, for example, Patent Document 1 proposes a structure in which an air passage is provided around the brush and the slip ring, and the shape of the hole for discharging the brush wear powder to the outside prevents foreign matter from entering from the outside.

  Further, in a rotating electrical machine having a brush and a slip ring and provided with a rotation angle detector for detecting the rotation angle of the rotor, a cooling fan is provided on the outer periphery of the main body of the rotation angle detector, and the cooling air is detected as a rotation detector A sensor that suppresses these temperature increases is shown (for example, see Patent Document 2).

Japanese Patent No. 3055451 JP 2006-180580 A (paragraphs [0029] to [0031], FIGS. 3 and 4)

  However, in Patent Document 1, a ventilation path is provided around the brush and the slip ring. However, a cooling fan provided at the end of the rotor field core is used as power for flowing the wind. . The cooling air from the cooling fan is generally used to cool the rectifier, stator, rotor, etc. of the rotating electrical machine, so that the amount of air passing through these members is sufficient for the ventilation path around the brush and slip ring. May not be able to secure a proper air volume.

  In addition, as shown in Patent Document 2, when a cooling fan is provided on the outer periphery of the main body of the rotation angle detector, the sensor can surely be cooled, but it is more effective for brushes and slip rings that generate more heat. The wind cannot be sent and the effect of discharging brush wear powder is low.

  The present invention has been made to solve the above-described conventional problems, and provides a rotating electrical machine capable of effectively sending cooling air to a brush and a slip ring and effectively discharging brush wear powder. provide.

  A rotating electrical machine according to the present invention includes a rotating shaft that is rotatably supported by a housing, a stator that is fixed to the housing and that has an armature winding, and a field core and a field that are fixed to the rotating shaft and that are fixed to the rotating shaft. A rotor having windings, a slip ring fixed to the rotating shaft and supplying a field current to the field winding, and fixed to the rear side of the housing and connected to the field winding via the slip ring. A cooling fan having a brush for supplying a magnetic current and flowing cooling air in an axial direction with respect to the brush and the slip ring at a position on the rear side from the slip ring of the rotating shaft or a position on the front side of the slip ring of the rotating shaft Is installed.

  A rotating electrical machine according to the present invention includes a rotating shaft that is rotatably supported by a housing, a stator that is fixed to the housing and that has an armature winding, and a field core and a field that are fixed to the rotating shaft and that are fixed to the rotating shaft. A rotor having windings, a slip ring fixed to the rotating shaft and supplying a field current to the field winding, and fixed to the rear side of the housing and connected to the field winding via the slip ring A brush for supplying a field current and a rotation sensor disposed on the rear side from the slip ring of the rotation shaft, and a position on the rear side from the rotation sensor of the rotation shaft, or a position on the front side from the rotation sensor of the rotation shaft, A cooling fan for flowing cooling air in the axial direction with respect to the rotation sensor, the brush and the slip ring is installed.

  According to this invention, it is possible to effectively send cooling air to the brush and the slip ring, and to effectively discharge the brush wear powder. Also, the rotation sensor can be effectively cooled.

Embodiment 1 FIG.
1 is a sectional view showing a rotating electrical machine according to Embodiment 1 of the present invention, and FIG. 2 is an enlarged perspective view showing a cooling fan mounting portion according to Embodiment 1. FIG. In addition, the rotary electric machine 100 demonstrated by this Embodiment has shown the example of the alternating current generator motor (motor generator) for vehicles.

  A rotating electrical machine 100 according to the present embodiment includes a front bracket 6 and a rear bracket 7 as housings, and a rotary shaft 1 rotatably supported via a bearing 11A of the front bracket 6 and a bearing 11B of the rear bracket 7. A stator 5 fixed to the front bracket 6 and the rear bracket 7 and having an armature winding 5a; and a rotor 10 fixed to the rotary shaft 1 and having a field core 2 and a field winding 3; The pulley 9 is fixed to the front end of the rotary shaft 1. The rotating electrical machine 100 is connected to a rotating shaft (not shown) of the engine via a pulley 9 and a belt (not shown) hung on the pulley 9. Further, since the temperature of the rotor 10 and the stator 5 rises due to heat generated when the rotating electrical machine 100 is driven, cooling fans 12 and 13 are provided on both axial end surfaces of the rotor 10.

  The rotating electrical machine 100 includes a pair of slip rings 4 mounted on the rear side of the rotating shaft 1, a brush holder 80 attached to the rear bracket 7 so as to be positioned on the rear side outer periphery of the rotating shaft 1, and the pair of A pair of brushes 8 disposed in the brush holder 80 so as to be in sliding contact with the slip ring 4 is provided. In this specification, with the rotor 10 as the center, the side on which the pulley 9 is attached is called the front side, and the side on which the slip ring 4 is attached is called the rear side.

  Further, the rotating electrical machine 100 includes a power circuit unit 30 that converts DC power into AC power or AC power into DC power, a field circuit unit 31 that supplies a field current to the field winding 3 of the rotor 10, A control circuit unit 32 that controls the power circuit unit 30 and the field circuit unit 31 is provided, and is connected to the outside through an external connection connector 35 and a power supply terminal 36.

  The power circuit section 30 includes a plurality of power elements (switching elements described later) 30a and 30b, and an inner heat sink 30g and an outer heat sink 30h that also serve as electrode members that are electrically connected to the power elements 30a and 30b. . Connection between each power element is performed by a conductive member (not shown) insert-molded in resin and heat sinks 30g and 30h, and electrically connected to the control circuit unit 32 by a relay wiring member (not shown). Connected.

  The control circuit unit 32 includes a control circuit board 32a and a resin case 33 for housing the control circuit board 32a. The case 33 has a waterproof structure that prevents salt mud water from entering the control circuit board 32a by a waterproof cover 33a or the like. The field circuit unit 31 can be mounted on the same substrate 32a as the control circuit board 32a, or may be configured separately from the control circuit board 32a. The external connection connector 35 is disposed in the vicinity of the control circuit unit 32 and is electrically connected to the control circuit unit 32.

  FIG. 3 is a control circuit diagram of the rotating electrical machine 100 of the present embodiment. In the figure, a rotating electrical machine 100 that is an AC generator motor includes an armature winding 5a of a stator 5 and a field winding 3 of a rotor 10, and the armature winding 5a of the stator 5 has three phases ( (U-phase, V-phase, W-phase) coils. In the power circuit section 30, two sets of switching elements (power transistors, MOSFETs, IGBTs, etc.) 30a and parallel diodes constituting the upper arm 30A and two switching elements 30b and parallel diodes constituting the lower arm 30B are connected in series. Is set as one set, and three such sets are arranged in parallel to constitute an inverter. A capacitor 102 is connected to the inverter in parallel. Each phase end of the armature winding 5a is connected to an intermediate connection point between the switching element 30a of the upper arm 30A and the switching element 30b of the lower arm 30B connected in series via an AC wiring. Moreover, the positive electrode terminal and the negative electrode terminal of the battery 101 are connected to the positive electrode side and the negative electrode side of the power circuit unit 30 through a series wiring.

  The field circuit unit 31 is connected in parallel to two semiconductor elements 31a and 31b connected in series with the field winding 3 interposed between the brush 8 and the slip ring 4 (see FIG. 1), and a shunt resistor 31c. A flywheel diode 31d is provided.

  The control circuit unit 32 controls the switching operation of the switching element 30a of the upper arm 30A and the switching element 30b of the lower arm 30B of the power circuit unit 30, and controls the field circuit unit 31 to control the field windings of the rotor. 3 is adjusted.

  Next, the outline of the control operation of the rotating electrical machine 100 of the present embodiment will be described based on FIG. When the engine is started, DC power is supplied from the battery 101 to the power circuit unit 30 via the power supply terminal 36. The control circuit unit 32 performs ON / OFF control of the switching elements 30a and 30b of the power circuit unit 30 to convert the DC power into three-phase AC power. And this three-phase alternating current power is supplied to the armature winding 5a of the rotary electric machine 100 which is an alternating current generator motor. On the other hand, based on a command from the control circuit unit 32, the field circuit unit 31 supplies a field current to the field winding 3 of the rotor 10. Drive torque is generated by the linkage between the magnetic flux generated around the field winding 3 and the current flowing through the armature winding 5a of the stator 5. With this drive torque, the rotor 10 is rotationally driven and transmitted from the pulley 9 via a belt (not shown) to the crankshaft of the engine, and the engine is started.

  On the other hand, in the engine operating state, the rotational power of the engine is transmitted from the crankshaft to the pulley 9 via a belt (not shown). With this driving force, the rotor 10 fixed to the rotating shaft 1 rotates. Thereby, since the magnetic flux generated by the field winding 3 of the rotor 10 is linked to the armature winding 5a of the stator 5, a three-phase AC voltage is induced in the armature winding 5a. The control circuit unit 32 controls ON / OFF of the switching elements 30a and 30b of the power circuit unit 30, converts the three-phase AC power induced in the armature winding 5a into DC power, and charges the battery 101. To do.

  As described above, in the field winding type rotating electrical machine 100, the field current from the field circuit unit 31 is passed through the brush 8 fixed to the rear bracket 7 and the slip ring 4 attached to the rotating shaft 1. Supplied. Since the fixed brush 8 and the rotating slip ring 4 are in contact with each other, the friction between them causes the temperature of the brush 8 and the slip ring 4 to become high, thereby reducing the life of the brush. Moreover, the abrasion powder of the brush 8 or the slip ring 4 is generated, and short circuit and ground fault due to the abrasion powder become a problem.

  Therefore, in the present embodiment, the cooling fan 20 for cooling the brush 8 and the slip ring 4 is installed on the rotary shaft 1 of the rotor 10 at a position on the rear side of the slip ring 4. The cooling fan 20 sucks cooling air from the outer circumferential direction of the cooling fan 20 or from the rear side of the cooling fan 20, and flows the sucked cooling air to the front side along the rotary shaft 1, and at least the brush 8 and the slip The contact portion of the ring 4 and its peripheral position are passed through.

  According to the present embodiment, when the rotor 10 rotates, the cooling fan 20 installed on the rear side from the brush 8 of the rotating shaft 1 and the slip ring 4 also rotates to generate cooling air. The cooling air enters the cooling fan 20 from the outer peripheral direction of the cooling fan 20 or from the rear side of the cooling fan 20 and flows to the front side along the rotation shaft 1. As a result, the cooling air from the cooling fan 20 flows in the direction of the brush 8 and the slip ring 4 so that the brush 8 and the slip ring 4 can be cooled, and the brush wear powder generated by the friction between the brush 8 and the slip ring 4 is removed. Can be discharged. Moreover, brush wear can be reduced and the brush life can be improved by cooling the brush 8 and the slip ring 4. Further, by reducing the electric resistance of the brush 8, the field current can be increased and the characteristics of the rotating electrical machine 100 can be improved. Furthermore, since brush abrasion powder can be discharged | emitted efficiently, the short circuit and ground fault of the slip ring 4 by brush abrasion powder can be prevented.

  The cooling fan 20 according to the present embodiment may be manufactured by press working and fixed to the rear end surface of the rotating shaft 1 with screws. By manufacturing the cooling fan 20 by pressing, it can be manufactured at low cost. Further, the cooling fan 20 may be formed integrally with the slip ring 4. By integrally molding with the slip ring 4, it can be fixed to the rotary shaft 1 at the same time as the slip ring 4, so that the assembly process of the rotor 10 can be simplified and the cost can be reduced.

Embodiment 2. FIG.
4 is a cross-sectional view of the main part showing a rotating electrical machine according to Embodiment 2 of the present invention, and FIG. 5 is an enlarged perspective view showing a cooling fan mounting portion according to Embodiment 2. In FIG. In the present embodiment, the brush 8 and the cooling fan 21 for the slip ring 4 are installed in the vicinity of the rear side end portion of the rear side bearing 11B of the rotor 10. That is, the cooling fan 21 for cooling the brush 8 and the slip ring 4 is installed at a position on the front side of the slip ring 4 of the rotating shaft 1. The cooling fan 21 sucks cooling air from the rear side along the rotary shaft 1 so as to pass at least the contact portion between the brush 8 and the slip ring 4 and its peripheral position, and is provided in the outer peripheral direction of the cooling fan 21. It is made to discharge from the slit 24 made. In order to install the cooling fan 21, a space for the cooling fan 21 is provided in the bearing box portion 7 </ b> B of the rear bracket 7, and a slit 24 for exhaust is provided in the outer peripheral direction of the cooling fan 21.

  According to the present embodiment, when the rotor 10 rotates, the cooling fan 21 installed on the front side from the brush 8 and the slip ring 4 of the rotating shaft 1 also rotates. At this time, the cooling air is sucked along the rotary shaft 1 from the rear side, flows through the contact portion of the brush 8 and the slip ring 4 and its peripheral position, and is discharged from the slit 24 provided in the outer peripheral direction of the cooling fan 21. The Thereby, the brush 8 and the slip ring 4 are cooled, and the brush wear powder generated by the friction between the brush 8 and the slip ring 4 can be discharged. Further, the brush 8 and the slip ring 4 are cooled, so that the brush wear can be reduced and the brush life can be improved. Further, by reducing the electric resistance of the brush 8, the field current can be increased and the characteristics of the rotating electrical machine 100 can be improved. Furthermore, since brush abrasion powder can be discharged | emitted efficiently, the short circuit and ground fault of the slip ring 4 by brush abrasion powder can be prevented.

  In the present embodiment, the cooling fan 21 is manufactured by pressing and is fixed simultaneously with the rear bearing 11B. Thereby, an additional member is not required for fixing the cooling fan 21, and the cost can be reduced. Alternatively, the cooling fan 21 and the bearing 11B may be fixed in advance and assembled to the rotor 10 together. Further, the cooling fan 21 and the slip ring 4 may be integrally formed. The cooling fan 21 and the slip ring 4 are integrally formed, so that the cooling fan 21 can be fixed to the rotating shaft 1 at the same time as the slip ring 4. Therefore, the assembly process of the rotor 10 can be simplified and the cost can be reduced.

Embodiment 3 FIG.
6 is a cross-sectional view of a main portion showing a rotating electrical machine according to Embodiment 3 of the present invention. In the present embodiment, a resolver is attached as a rotation sensor 16 at a position on the rear side of the slip ring 4 of the rotating shaft 1. The resolver as the rotation sensor 16 includes a rotor 17 installed on the rotary shaft 1 and a stator 18 installed on the fixed side. A cooling fan 22 is fixed to the rear side of the resolver rotor 17. When the cooling fan 22 for cooling the brush 8 and the slip ring 4 is attached to the rotating electrical machine in which the rotation sensor 16 is installed in the vicinity of the rear side end of the rotating shaft 1, the rotation sensor 16 is positioned at an axial position close to the cooling fan 22. The rotor 17 is arranged. For this reason, by fixing the cooling fan 22 and the rotor 17 of the rotation sensor 16 at the same time, the assembly process of the rotating electrical machine can be simplified, and the cost can be reduced.

  As described above, in the present embodiment, the rotation sensor 16 is attached to the rear side of the slip ring 4 of the rotating shaft 1, and the cooling fan 22 is fixed to the rear side of the rotation sensor 16. Therefore, when the rotor 10 rotates, the cooling fan 22 installed on the rear side of the rotation sensor 16 also rotates to generate cooling air. Cooling air from the cooling fan 22 flows to the front side along the rotation axis 1 to cool the stator 18 and the rotor 17 of the rotation sensor 16 and flows in the direction of the brush 8 and the slip ring 4. The ring 4 is cooled. First, the detection error of the rotation sensor 16 can be reduced by cooling the rotation sensor 16. Further, by cooling the brush 8 and the slip ring 4, it is possible to reduce brush wear and improve the brush life. Further, by reducing the electric resistance of the brush 8, the field current can be increased and the characteristics of the rotating electrical machine 100 can be improved. Further, brush wear powder generated by friction between the brush 8 and the slip ring 4 can be discharged. That is, since brush abrasion powder can be discharged efficiently, short circuit and ground fault of the slip ring 4 due to brush abrasion powder can be prevented.

  In the present embodiment, an example in which a resolver is used as the rotation sensor 16 is given. The resolver is an environmentally friendly sensor and can ensure the reliability of rotation detection. Since the resolver is excited to measure the rotation of the rotor 10, the resolver generates heat. However, the cooling effect of the cooling fan 22 of the present embodiment can improve the reliability and life of the rotation sensor. In addition, not only the resolver as the rotation sensor 16 but also a magnetic rotation sensor using a Hall element, the same effect can be obtained by fixing the cooling fan simultaneously with the rotor of the rotation sensor.

Embodiment 4 FIG.
FIG. 7 is a cross-sectional view of the main part showing a rotating electrical machine according to Embodiment 4 of the present invention. In the present embodiment, a resolver is attached as a rotation sensor 16 at a position on the rear side of the slip ring 4 of the rotating shaft 1. The resolver as the rotation sensor 16 includes a rotor 17 installed on the rotary shaft 1 and a stator 18 installed on the fixed side. A cooling fan 23 is attached in the vicinity of the front end face of the resolver rotor 17. The cooling fan 23 sucks cooling air from the rear side along the rotary shaft 1 to cool the stator 18 and the rotor 17 of the rotation sensor 16 and further cools the cooling air in the direction of the brush 8 and the slip ring 4. The brush 8 and the slip ring 4 are cooled.

  According to the present embodiment, the cooling air from the cooling fan 23 can cool the stator 18 and the rotor 17 of the rotation sensor 16, the brush 8 and the slip ring 4. And the detection error of the rotation sensor 16 can be reduced by cooling the rotation sensor 16. Further, by cooling the brush 8 and the slip ring 4, it is possible to reduce brush wear and improve the brush life. Further, by reducing the electric resistance of the brush 8, the field current can be increased and the characteristics of the rotating electrical machine 100 can be improved. Further, brush wear powder generated by friction between the brush 8 and the slip ring 4 can be discharged. That is, since brush abrasion powder can be discharged efficiently, short circuit and ground fault of the slip ring 4 due to brush abrasion powder can be prevented.

Embodiment 5 FIG.
8 is a perspective view showing a stator of a rotation sensor of a rotating electrical machine according to Embodiment 5 of the present invention. This embodiment shows an example in which a resolver is used as the rotation sensor 16. In the present embodiment, an axial slit 25 is provided around the resolver stator 18. In general, in the rotation sensor 16, the interval between the rotor 17 and the stator 18 is related to the detection accuracy of the rotation sensor 16. In particular, the resolver cannot increase the interval, and the cooling fan 22 according to the above embodiment as it is. , 23 are arranged in the vicinity of the rotor 17 and the effect is reduced. For this reason, in this embodiment, the cooling fan described in the above embodiment is configured by forming the axial slit 25 around the stator 18 of the rotation sensor 16 and providing the axial passage of the cooling air. It makes it easy to pass the generated cooling air. Accordingly, the cooling air can be efficiently passed through the stator 18 of the rotation sensor 16, the brush 8 and the slip ring 4, and cooling of the stator 18 of the rotor 16, the brush 8 and the slip ring 4, and brush wear. Powder can be discharged effectively.

Embodiment 6 FIG.
FIG. 9 is a cross-sectional view of a main part showing a rotary electric machine according to Embodiment 6 of the present invention. In the present embodiment, in the rotating electrical machine provided with at least one of the cooling fans 20, 21, 22, 23 for cooling the brush 8 and the slip ring 4 of the above embodiment, the cooling fans 20, 21, 22 are provided. , 23 are provided with slits 26, 27 serving as input / output ports for the outside of the cooling air, and each of the slits 26, 27 has a labyrinth structure for preventing entry of water and foreign matters from the outside. Although FIG. 9 shows an example of the labyrinth structure in the axial direction, a labyrinth structure in which the ventilation path is shifted in the radial direction may be configured.

  In general, it is common to provide a labyrinth structure in the ventilation path to prevent water and foreign matter from entering, but the labyrinth structure increases the resistance of the air path and effectively prevents the flow of wind. End up. However, if a cooling fan is added to the inside of the rotating electrical machine as in the present invention, a large amount of cooling air can flow even if a labyrinth structure is adopted because air is generated inside the air passage, and the brush 8 and the slip ring 4 are cooled. It is possible to effectively discharge the brush wear powder.

  In the above embodiment, an example in which one cooling fan 20, 21, 22, 23 is attached has been shown. However, by combining arbitrary cooling fans 20, 21, 22, 23, it is more effective. It becomes possible to cool the brush and slip ring and to discharge the brush wear powder.

It is sectional drawing which shows the rotary electric machine by Embodiment 1 of this invention. It is an expansion perspective view which shows the cooling fan mounting part by Embodiment 1 of this invention. It is a control circuit diagram of the rotary electric machine by Embodiment 1 of this invention. It is sectional drawing of the principal part which shows the rotary electric machine by Embodiment 2 of this invention. It is an expansion perspective view which shows the cooling fan mounting part by Embodiment 2 of this invention. It is sectional drawing of the principal part which shows the rotary electric machine by Embodiment 3 of this invention. It is sectional drawing of the principal part which shows the rotary electric machine by Embodiment 4 of this invention. It is a perspective view which shows the stator of the rotation sensor of the rotary electric machine by Embodiment 5 of this invention. It is sectional drawing of the principal part which shows the rotary electric machine by Embodiment 6 of this invention.

Explanation of symbols

100 rotating electrical machines, 1 rotating shaft, 2 field iron cores, 3 field windings, 4 slip rings, 5 stators, 6, 7 housings, 8 brushes, 10 rotors, 16 rotation sensors,
20, 21, 22, 23 Cooling fan, 24, 25, 26, 27 Slit,
30 power circuit section, 31 field circuit section, 32 control circuit section.

Claims (7)

A rotating shaft rotatably supported by the housing;
A stator fixed to the housing and having armature windings;
A rotor fixed to the rotating shaft and having a field core and a field winding;
A slip ring fixed to the rotating shaft and supplying a field current to the field winding;
In a rotating electrical machine comprising a brush fixed to the rear side of the housing and supplying a field current to the field winding through the slip ring,
A cooling fan that flows cooling air in the axial direction with respect to the brush and the slip ring is installed at a position on the rear side of the slip ring of the rotary shaft or a position on the front side of the slip ring of the rotary shaft. Rotating electric machine characterized by that. A rotating shaft rotatably supported by the housing;
A stator fixed to the housing and having armature windings;
A rotor fixed to the rotating shaft and having a field core and a field winding;
A slip ring fixed to the rotating shaft and supplying a field current to the field winding;
A brush fixed to the rear side of the housing and supplying a field current to the field winding via the slip ring;
In the rotating electrical machine including a rotation sensor disposed on the rear side of the slip ring of the rotating shaft,
For cooling that causes cooling air to flow in the axial direction with respect to the rotation sensor, the brush, and the slip ring at a position on the rear side of the rotation sensor of the rotation shaft or a position on the front side of the rotation sensor of the rotation shaft. A rotating electrical machine characterized by a fan. The cooling fan installed on the front side of the slip ring of the rotating shaft sucks cooling air from the axial direction of the brush and the slip ring and discharges it in the radial direction of the cooling fan. The rotating electrical machine according to claim 1. The cooling fan installed at a position on the rear side of the slip ring of the rotating shaft or a position on the front side of the slip ring of the rotating shaft is formed integrally with the slip ring. Item 2. The rotating electrical machine according to Item 1. The cooling fan installed at a position on the rear side of the rotation shaft of the rotation shaft or a position on the front side of the rotation sensor of the rotation shaft is fixed simultaneously with the rotor of the rotation sensor. The rotating electrical machine according to claim 2. The rotating electrical machine according to claim 2, wherein an axial slit is formed around the stator of the rotation sensor. The rotating electrical machine according to any one of claims 1 to 6, wherein a passage having a labyrinth structure connected to the outside of the rotating electrical machine is provided in the vicinity of the cooling fan.

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