JP2013150468A - Rotary electric machine for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine for a vehicle which improves heat radiation and cooling performance when air-cooling the rotary electric machine for the vehicle which integrally includes a power control part.SOLUTION: An entire amount of cooling air WIN introduced from a cooling air introduction passage 6 is guided to a ventilation hole 2 and is sent to a rotary electric machine part 12. A power control board 7 is disposed in a ventilation passage W of the cooling air WIN which moves from the cooling air introduction passage 6 to the ventilation hole 2. Thus, even if the power control board 7 generates heat in response to control operation of the rotary electric machine part 12, the cooling air WIN passing through the ventilation passage W effectively radiates heat of the power control board 7 and cools the power control board 7.

Description

  The present invention relates to a rotating electrical machine for a vehicle, and more particularly to air cooling of a rotating electrical machine for a vehicle that is integrally provided with a power control unit.

  In recent years, in order to prevent global warming, a technique for stopping the engine when the vehicle is stopped (idling stop technique) has been proposed. In the idling stop technology, various methods have been proposed when the engine is started again from a state where the engine is stopped. As one of them, there is a method of starting an engine using an alternator (vehicle generator) that charges a battery while the engine is running. When starting the engine, an alternator (vehicle generator) is used as an electric motor. In this case, an inverter device or the like is required to rotationally drive the alternator (vehicle generator). In addition, a rectifier or the like is required to charge the battery with power generated by an alternator (vehicle generator) when the engine is operating. Techniques have been proposed in which power control units such as these inverter devices and rectifiers are integrated with an alternator (vehicle generator).

  A semiconductor element is generally used for an inverter device, a rectifier, or the like mounted on such a power control unit. However, a semiconductor element has a property that its operating characteristics change depending on the operating temperature. In particular, when the heat is high, the characteristics may deteriorate or a failure due to element destruction may occur. In order to operate a power control unit including a semiconductor element or the like within a range of predetermined control characteristics, use in an environment that does not exceed an allowable use temperature range is required. For this reason, even when the power control unit is integrated with an alternator (vehicle generator) to make it compact, the heat dissipation design is made so that the temperature rise of the inverter device, the rectifier, etc. is within the allowable operating temperature range. It is essential. Therefore, in a conventional inverter unit-integrated dynamoelectric machine device, an air suction port provided in a joint portion between the end housing of the dynamoelectric machine and the case of the inverter device, a ventilation hole provided in an axial wall surface of the end housing, and an end The cooling performance is improved by smoothly passing the cooling air through a cooling air passage formed by a discharge hole provided in the radial wall surface of the housing (Patent Document 1, etc.).

JP 2011-35961 A

  However, in the above-described inverter device-integrated dynamoelectric machine, cooling air intakes are opened in all directions on the circumferential surface. The intake port and the discharge port are arranged close to each other. For this reason, it is also conceivable that the warmed exhaust air discharged from the apparatus is taken in from the air intake port again. In this case, warmed air is taken in, and it may be difficult to perform sufficient heat dissipation and cooling. There is a possibility that the heat dissipation / cooling characteristics may be insufficient, and efficient heat dissipation / cooling cannot be performed, which is a problem.

  In addition, in order to improve fuel efficiency by driving the air conditioner when idling is stopped by motor drive, power regeneration efficiency during deceleration regeneration when functioning as a generator, and other engine assist, etc., inverter devices, rectifiers, etc. It is necessary to provide a margin for the rating. However, if a large amount of power can be handled with a sufficient margin in the rating, the heat generated by the inverter or rectifier may become even greater, and the conventional technology can provide sufficient heat dissipation and cooling effects. There is no problem.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicular rotating electrical machine that has improved heat dissipation and cooling performance when the vehicular rotating electrical machine that is integrally provided with a power control unit is air-cooled. .

  The vehicular rotating electrical machine according to the present application includes a rotating electrical machine unit and a power control unit that controls the rotating electrical machine unit. The power control unit is disposed adjacent to the rotating shaft direction of the rotating electrical machine unit, and includes a cooling air introduction path, a ventilation hole, and a power control unit. The cooling air introduction path is a path for introducing the cooling air toward the rotation axis. The cooling air introduction path is connected to the ventilation hole, and the ventilation hole is opened toward the rotating electrical machine portion at the periphery of the rotation shaft. A power control circuit is mounted on the power control unit and is arranged to be cooled by cooling air from the cooling air introduction path toward the ventilation hole. Cooling air is introduced from the cooling air introduction passage in accordance with the negative pressure generated by the rotation of the air blowing fin provided integrally with the rotor in the rotating electrical machine unit.

  Furthermore, the inlet of the cooling air introduction path is opened in the radial direction. The rotating electrical machine section includes an exhaust port that exhausts cooling air in a housing that houses the rotor and stator, and the exhaust port on the power control unit side in the direction of the rotation axis has an exhaust amount that is greater than that near the intake port. It is formed so that there are more parts away from.

  Furthermore, there are two types of exhaust ports, a first exhaust port and a second exhaust port. The first exhaust port is disposed at a position adjacent to the intake port in the rotation axis direction, and the second exhaust port is disposed circumferentially adjacent to the first exhaust port. Further, the first exhaust port is formed so that the opening area of the exhaust port is smaller than that of the second exhaust port.

  Further, the cooling air introduction path is disposed between the power control unit and the rotating electrical machine unit.

  Further, the air inlet of the cooling air introduction path is arranged to open toward the front of the vehicle.

  Further, the cooling air introduction path has a wall surface formed of a member having good thermal conductivity, and the power control unit is disposed on the outer wall surface of the cooling air introduction path. Radiation fins are erected on the inner wall surface toward the ventilation path.

  According to the vehicular rotating electrical machine according to the present application, the entire amount of the cooling air introduced from the cooling air introduction path is guided to the ventilation hole and exhausted. The power control unit is arranged so as to be cooled by the cooling air from the cooling air introduction path toward the ventilation hole. For this reason, even if the power control circuit mounted on the power control unit generates heat according to the control operation of the rotating electrical machine unit, the power control circuit mounted on the power control unit and the power control unit Heat can be effectively radiated and cooled by the cooling air introduced from the introduction path.

  In addition, the rotating electrical machine unit includes an exhaust port for exhausting cooling air in a housing that houses the rotor and the stator, and the exhaust port on the power control unit side in the rotation axis direction has an exhaust amount in the radial direction. It is formed so that the portion away from the intake port is larger than the vicinity of the intake port of the cooling air introduction path that is opened. As a result, the exhaust air is mainly discharged from a portion away from the intake port, and the amount of the exhaust air exhausted near the intake port of the cooling air introduction path is limited. For this reason, it can suppress that the exhaust air which was provided for heat radiation and cooling within the rotating electrical machine for vehicles and was warmed up is taken in again from the cooling air introduction path. Since the cooling air introduced from the cooling air introduction path is newly taken in from the outside air, heat can be radiated and cooled effectively in the vehicular rotating electrical machine.

  Further, since the opening area of the first exhaust port is smaller than the opening area of the second exhaust port, the exhaust air is mainly discharged from the second exhaust port, and the amount discharged from the first exhaust port is limited. As a result, the amount of exhaust air exhausted to a position adjacent to the intake port of the cooling air introduction path in the rotation axis direction is limited. For this reason, it can suppress that the exhaust air which was provided for heat radiation and cooling within the rotating electrical machine for vehicles and was warmed up is taken in again from the cooling air introduction path. Since the cooling air introduced from the cooling air introduction path is newly taken in from the outside air, heat can be radiated and cooled effectively in the vehicular rotating electrical machine.

  In addition, since the cooling air introduction path is disposed between the power control unit and the rotating electrical machine unit, the power control unit and the rotating electrical machine unit are thermally blocked by the cooling air. The propagation of heat generated in each can be suppressed, and the thermal effects of heat transfer from each other can be eliminated.

  In addition, since the intake port of the cooling air introduction path is opened toward the front of the vehicle, the outside air that has not been warmed is taken in without taking in air that has been warmed in other parts of the engine room, particularly during traveling. It can be taken in efficiently.

  The wall surface of the cooling air introduction path is formed of a member having good thermal conductivity, and the radiation fins are erected from the inner wall surface of the cooling air introduction path where the power control unit is disposed toward the ventilation path. As a result, the cooling air introduction path itself has good heat dissipation. The power control unit disposed in the cooling air introduction path with good heat dissipation is effectively radiated and cooled.

It is the figure which displayed the structure of the rotary electric machine for vehicles in one Embodiment of this invention, displaying the cross section along a rotating shaft in the electric power control part and a part of rotary electric machine part. It is sectional drawing which looked at the AA cross section of FIG. 1 from the direction of an arrow. It is a side view of the rotary electric machine for vehicles in one embodiment of the present invention. It is the side view which looked at the rotary electric machine for vehicles in one Embodiment of this invention from the inlet of the cooling wind introduction path. It is a side view which shows the structure by the side of the electric power control part of the rotary electric machine for vehicles in the 1st another example of one Embodiment. It is a side view which shows the structure of the rotary electric machine for vehicles in the 2nd another example of one Embodiment. It is a side view which shows the structure of the rotary electric machine for vehicles in the 3rd another example of one Embodiment. It is a mimetic diagram showing the state where the rotation electrical machinery for vehicles in the embodiment of the present invention was carried in vehicles.

  A structure of a vehicular rotating electrical machine according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4 and FIG. 8.

  FIG. 1 is a diagram showing a structure of a vehicular rotating electrical machine according to an embodiment of the present invention, with a power control unit 13 and a part of the rotating electrical machine unit 12 displayed in a cross section along the rotating shaft 1. 2 is a cross-sectional view of the AA cross section of FIG. 1 as viewed from the direction of the arrow. FIG. 3 is a side view of the vehicular rotating electrical machine according to the embodiment of the present invention. FIG. 4 is a side view of the vehicular rotating electrical machine according to the embodiment of the present invention as viewed from the air inlet 6 a of the cooling air introduction path 6.

A configuration of a vehicular rotating electrical machine according to an embodiment of the present invention will be described.
The rotating electrical machine for a vehicle controls a rotating electrical machine unit 12 that functions as an alternator (generator) or an electric motor, and power generation when the rotating electrical machine unit 12 is used as a generator or driving when the rotating electrical machine unit 12 is used as an electric motor. A power control unit 13 is disposed adjacent to the rotating shaft 1 of the rotating electrical machine unit 12 (see FIGS. 1, 3, and 4).

  The rotating electrical machine unit 12 has a general structure of a rotating electrical machine including a rotor 3 in which a rotating shaft 1 is disposed at the center and a stator 4 that is disposed to face the peripheral surface of the rotor 3 and on which a coil 8 is wound. These are housed in the motor housing 5 (see FIG. 1).

  As shown in FIG. 1, blower fins 3 a are integrally provided with the rotor 3 on the end surface of the rotor 3 adjacent to the power control unit 13 along the rotation shaft 1. A pulley 10 is pivotally supported on the rotary shaft 1 via the motor housing 5 on the end surface on the opposite side of the power control unit 13 along the rotary shaft 1 (see FIGS. 1, 3, and 4). The pulley 10 is stretched over a crankshaft 25 (see FIG. 8) of the engine 23 (see FIG. 8) via a belt 21 (see FIG. 8).

  In addition, a portion of the side wall of the motor housing 5 that reaches the end on the power control unit 13 side in the direction of the rotating shaft 1 is an intake port of the cooling air introduction path 6 for radiating and cooling the power control unit 13. Exhaust ports 9a and 9b for cooling air sucked from 6a are opened at predetermined intervals in the circumferential direction (see FIGS. 3 and 4). The exhaust ports 9a and 9b have an elongated opening shape along the direction of the rotating shaft 1, and the exhaust port 9a is opened narrower than the exhaust port 9b. Further, the exhaust port 9a is disposed at a position adjacent to the intake port 6a in the direction of the rotation shaft 1. The exhaust port 9b is disposed in the circumferential direction adjacent to the exhaust port 9a.

  Further, on the side wall of the motor housing 5 that reaches the end on the pulley 10 side in the direction of the rotary shaft 1, cooling air exhaust ports 9c for radiating and cooling the rotating electrical machine part 12 are provided at predetermined intervals in the circumferential direction. (See FIGS. 1, 3, and 4). The exhaust port 9 c has an elongated opening shape along the direction of the rotating shaft 1.

In the vehicular rotating electrical machine according to the embodiment of the present invention, the rotating electrical machine unit 12 functions as an alternator (generator) and an electric motor. That is, it functions as an alternator (generator) when the engine is operating, and functions as an electric motor when idling is stopped (that is, when the engine is started when the engine is stopped). When the engine is in operation, the rotation of the crankshaft 25 (see FIG. 8) rotates the pulley 10 via the belt 21 (see FIG. 8) to generate electric power in the rotating electrical machine unit 12. In addition, when idling is stopped, the rotating electrical machine unit 12 rotates as a starter, whereby the crankshaft 25 is rotated via the belt 21 and the engine 23 (see FIG. 8) is restarted.
After the engine 23 is restarted, the pulley 10 is rotated by the rotation of the crankshaft 25, and the rotating electrical machine unit 12 operates as a normal alternator (generator), and a battery (not shown) and other vehicle electrical components (not shown). ).

The power control unit 13 has an electric power control board 7 mounted on the outer wall surface of the cooling air introduction path 6 on the side opposite to the rotating electrical machine unit 12 (see FIGS. 1, 3 and 4). . A circuit that performs power control of the rotating electrical machine unit 12 is mounted on the power control board 7. Specifically, a rectifying function for rectifying generated power from the rotating electrical machine unit 12 when functioning as an alternator (generator), and an inverter for supplying drive power to the rotating electrical machine unit 12 when functioning as an electric motor Combined with functions. The rectifying function and the inverter function are both constituted by circuit elements including a semiconductor element for power control and are mounted on the power control board 7. The semiconductor element having a rectifying function includes a rectifying element such as a diode, and converts AC power generated by the rotating electrical machine unit 12 into DC power. The converted DC power is charged in a battery (not shown) or the like. The semiconductor element having an inverter function includes a power switching element such as a MOS transistor or an IGBT, and controls the rotational drive of the rotating electrical machine unit 12 by converting DC power supplied from a battery (not shown) into AC power. A power switching element such as a MOS transistor or IGBT may have a built-in diode structure, and if the power control unit 13 includes an inverter function by a configuration including the power switching element, it also has a rectifying function. It can be configured.
The rotary shaft 1 has a pulley 10 side provided with a bearing (not shown) provided on the motor housing 5 and a power control unit 13 side provided with a bearing provided on the inner wall of the cooling air introduction path 6 (see FIG. 1). It is rotatably supported.

  The cooling air introduction path 6 is opened in a rectangular shape in the radial direction of the vehicular rotating electric machine, and the vehicular rotating electric machine is installed in the vehicle so that the intake port 6a of the cooling air introduction path 6 is arranged in a direction in which the front of the vehicle is desired. (See FIGS. 1, 3, 4, 8). Moreover, it has the rectangular tubular ventilation path W (refer FIG. 1, 3) which introduces the cooling air WIN suck | inhaled from the inlet 6a to the rotating shaft 1. FIG. In the ventilation path W, radiating fins 11 are erected in parallel to the ventilation path W from the inner surface of the outer wall surface on which the power control board 7 is placed into the ventilation path W (FIG. 4). ,reference). In addition, the wall surface of the cooling air introduction path 6 is molded with a heat conductive fin 11 and a member having good thermal conductivity. Therefore, the cooling air introduction path 6 is efficiently radiated and cooled by the cooling air WIN passing through the ventilation path W.

  The cooling air introduction path 6 has a ventilation hole 2 (see FIGS. 1 and 2) that surrounds the rotating shaft 1 and overlooks the rotating electrical machine portion 12. The entire amount of the cooling air WIN introduced from the intake port 6 a passes through the ventilation passage W of the cooling air introduction passage 6 and is sent from the ventilation hole 2 to the rotating electrical machine unit 12.

  As shown in FIG. 2, the ventilation hole 2 is an annular shape surrounding the outer peripheral edge of the rotating shaft 1, and is opened on the inner diameter side from the position where the blower fins 3 a of the rotor 3 are arranged.

  A mechanism of heat radiation / cooling by intake of the cooling air WIN in the vehicular rotating electrical machine having the above-described configuration will be described.

  As the rotor 3 rotates, the blowing fins 3a formed integrally with the rotor 3 also rotate in the same manner. As a result, the air that has been on the inner diameter side from the blower fin 3a is exhausted from the exhaust ports 9a and 9b. The inner diameter side of the blower fin 3a becomes a negative pressure by the exhaust by rotation of the blower fin 3a. Using this negative pressure, outside air is sucked as cooling air WIN from the intake port 6a. The sucked cooling air WIN flows into the rotating electrical machine section 12 through the ventilation hole 2 through the ventilation path W in the cooling air introduction path 6. The cooling air WIN flowing into the rotating electrical machine unit 12 is exhausted from the exhaust ports 9a and 9b opened in the side wall of the motor housing 5 on the outer diameter side of the blower fin 3a (see FIG. 3).

  The entire amount of the cooling air WIN sucked from the air inlet 6 a of the cooling air introduction path 6 passes through the ventilation path W of the cooling air introduction path 6. The wall surface of the cooling air introduction path 6 is formed of a member having good thermal conductivity, and similarly, the heat radiation fins 11 having good thermal conductivity are erected in the ventilation path W. For this reason, heat radiation and cooling by the cooling air WIN are performed satisfactorily. Since the power control board 7 is placed on the outer wall surface of the cooling air introduction path 6 and the ventilation path W is configured including this outer wall surface, it is radiated and cooled well through the outer wall surface. Therefore, even if the power control board 7 generates heat according to the control operation of the rotating electrical machine unit 12, heat can be efficiently radiated and cooled.

  In addition, the cooling air introduction path 6 is provided between the power control board 7 and the rotating electrical machine unit 12, and the ventilation path W through which the cooling air WIN passes is formed. As a result, the power control board 7 and the rotating electrical machine unit 12 are thermally blocked by the cooling air WIN. The heat generated in each region does not propagate to other regions, and the thermal effects of heat transfer from each other can be eliminated.

  The cooling air WIN that has passed through the ventilation path W is exhausted to the outside as exhaust air WOUT through the exhaust ports 9a and 9b. Here, the exhaust air WOUT is air that has been warmed up because it is air after the power control board 7 has been radiated and cooled through the rotating electrical machine for the vehicle. Therefore, among the exhaust ports 9a and 9b disposed in the circumferential direction of the rotating electrical machine unit 12, the exhaust port 9b disposed in the circumferential direction adjacent to the exhaust port 9a is configured to be wider than the exhaust port 9a. The exhaust can be performed mainly from the exhaust port 9b (see FIGS. 3 and 4). Thereby, exhaust from the exhaust port 9a can be restricted. Accordingly, it is possible to suppress the exhausted air WOUT that has been warmed from being sucked again from the intake port 6a.

  Further, since the intake port 6a of the cooling air introduction path 6 is opened toward the front of the vehicle (see FIG. 8), the air is warmed without taking in the air warmed in the engine room, particularly during traveling. It can efficiently take in outside air.

  Thereby, the cooling air WIN introduced from the cooling air introduction path 6 can efficiently take in the outside air that has not been warmed up, and can effectively dissipate and cool the vehicle in the rotating electrical machine.

  On the other hand, in the rotating electrical machine part 12, the cooling air sucked from the pulley 10 side exhausts and cools the rotating electrical machine part 12, and then exhausts from the exhaust port 9 c opened at the end of the motor housing 5 on the pulley 10 side. Is done.

  5 to 7 show the structure of a vehicular rotating electrical machine according to first to third other examples of one embodiment.

  In the rotating electrical machine for a vehicle in the first other example shown in FIG. 5, the exhaust port 9a in one embodiment (FIGS. 1 to 4) is not formed, and the configuration in which there is no opening in this part is illustrated. It is.

  For this reason, the entire amount of the exhaust air is exhausted from the exhaust port 9b, and the amount of the exhaust air WOUT exhausted near the intake port 6a of the cooling air introduction path 6 is further limited as compared with the embodiment. As a result, it is possible to suppress the exhaust air WOUT, which is used for heat dissipation and cooling of the electric power control unit 13 in the vehicular rotating electrical machine and warmed up, from being taken in again from the cooling air introduction path 6. Since the cooling air WIN introduced from the cooling air introduction path 6 is newly taken in from the outside air, it can be effectively radiated and cooled in the vehicular rotating electrical machine.

  In the rotating electrical machine for the vehicle in the second alternative example shown in FIG. 6, the exhaust opening 9 c is used as an exhaust opening that is opened on the pulley 10 side for exhausting cooling air that radiates and cools the rotating electrical machine portion 12. In addition, an exhaust port 9d is provided. In one embodiment, the exhaust port 9d is disposed in place of the exhaust port 9c disposed at a position adjacent to the intake port 6a of the cooling air introduction path 6 in the direction of the rotation axis 1. The exhaust port 9d has a smaller opening area than the exhaust port 9c.

  In the third embodiment of the rotating electrical machine for the vehicle shown in FIG. 7, in one embodiment, the exhaust gas disposed at a position adjacent to the inlet 6 a of the cooling air introduction path 6 in the direction of the rotation shaft 1. The opening 9d is not formed and is not opened.

  In the vehicular rotating electrical machine according to the second example, the opening area of the exhaust port 9d is smaller than the opening area of the exhaust port 9c. Therefore, the exhaust air used for heat dissipation / cooling of the rotating electrical machine unit 12 is mainly the exhaust port 9c. The amount discharged from the exhaust port and exhausted from the exhaust port 9d is limited. The amount of exhaust air from the rotating electrical machine 12 that is exhausted to a position adjacent to the cooling air intake 6a for heat radiation / cooling of the power control unit 13 in the direction of the rotary shaft 1 is limited. For this reason, it is possible to suppress the exhaust air that has been warmed by being used for heat dissipation and cooling of the rotating electrical machine section 12 in the rotating electrical machine for the vehicle from being taken into the cooling air introduction path 6 again. Since the cooling air WIN introduced from the cooling air introduction path 6 is newly taken in from the outside air, the rotating electrical machine portion 12 of the rotating electrical machine for the vehicle can be effectively radiated and cooled.

  Further, in the vehicular rotating electrical machine in the third alternative example, since the exhaust port 9d is not formed or opened at a position adjacent to the intake port 6a of the cooling air introduction path 6 in the direction of the rotation shaft 1, the rotating electrical machine is not opened. Exhaust air from the portion 12 is exhausted from a position different from the intake port 6a in the direction of the rotary shaft 1 in its entirety. For this reason, it is possible to further suppress the exhaust air that has been used for heat dissipation and cooling of the rotating electrical machine portion 12 in the vehicular rotating electrical machine and warmed up again from being taken into the cooling air introduction path 6. Since the cooling air WIN introduced from the cooling air introduction path 6 is newly taken in from the outside air, the rotating electrical machine portion 12 of the vehicular rotating electrical machine can be effectively radiated and cooled.

  Here, the rotor 3 is an example of a rotor, and a circuit including a rectifying element such as a diode and a power switching element such as a MOS transistor or IGBT is an example of a power control circuit. The motor housing 5 is an example of a housing. The exhaust port 9a is an example of a first exhaust port, and the exhaust port 9b is an example of a second exhaust port. The power control board 7 is an example of a power control unit.

  As described above in detail, according to the present embodiment, the entire amount of the cooling air WIN introduced from the cooling air introduction passage 6 is guided to the ventilation hole 2. Since the power control board 7 is mounted on the cooling air introduction path 6 constituting the ventilation path W of the cooling air WIN from the cooling air introduction path 6 toward the ventilation hole 2, the power control board 7 controls the rotating electrical machine unit 12. Even if heat is generated according to the operation, the power control board 7 is effectively radiated and cooled by the cooling air WIN flowing through the ventilation path W.

  Further, since the exhaust port 9a is opened narrower than the exhaust port 9b and the opening area is small, the exhaust air WOUT is mainly exhausted from the exhaust port 9b. Since the exhaust port 9a is opened at a position adjacent to the intake port 6a of the cooling air introduction path 6 in the direction of the rotary shaft 1, the amount of the exhaust wind WOUT exhausted at a position adjacent to the intake port 6a is Limited. For this reason, the exhaust air WOUT that is used for heat dissipation and cooling by the rotating electrical machine portion 12 of the rotating electrical machine for the vehicle is not taken in again from the intake port 6a. Outside air that is not warmed can be efficiently taken in from the intake port 6a. Heat dissipation and cooling can be effectively performed in the vehicular rotating electrical machine.

  In addition, since the cooling air introduction path 6 is disposed between the power control board 7 and the rotating electrical machine unit 12, the power control board 7 and the rotating electrical machine unit 12 are thermally blocked by the cooling air. It is possible to eliminate the thermal influence caused by the heat generated in each of the heats transferred to the facing area.

  Further, since the intake port 6a of the cooling air introduction path 6 is opened toward the front of the vehicle, the air heated in the engine room is not taken into the intake port 6a, particularly during traveling, and is warmed up. The outside air is not taken in efficiently.

  Further, the wall surface of the cooling air introduction path 6 is formed of a member having good thermal conductivity, and heat is radiated from the inner wall surface of the cooling air introduction path 6 where the power control board 7 is disposed toward the ventilation path W. Fins 11 are erected. Further, the heat dissipating fins 11 are also formed of a member having good thermal conductivity, like the wall surface of the cooling air introduction path 6. As a result, the cooling air introduction path 6 and the power control board 7 placed on the cooling air introduction path 6 are effectively radiated and cooled.

Needless to say, the present invention is not limited to the above-described embodiment, and various modifications and changes can be made without departing from the spirit of the present invention.
For example, although the power control board 7 has been described as being placed on the outer wall surface of the cooling air introduction path 6 in the present embodiment, the present application is not limited to this. It can also be set as the structure mounted in the ventilation path W in the cooling wind introduction path 6. FIG.
Moreover, although the exhaust port 9a was demonstrated with the exhaust port 9b and the case where it opens at the predetermined | prescribed space | interval in the circumferential direction in the side wall of the motor housing 5, this application is not limited to this. The intervals at which the exhaust ports 9a are opened may be spaced apart from the intervals at which the exhaust ports 9b are opened. Further, the opening shape is not limited to the elongated opening shape, but may be other shapes.
Further, the arrangement intervals and the opening shapes of the exhaust ports 9c and 9d are not limited to those in the embodiment.

1 Rotating shaft 2 Ventilation hole 3 Rotor 3a Blowing fin 4 Stator 5 Motor housing
6 Cooling air introduction path 6a Intake port 7 Power control board 8 Coil 9 Exhaust ports 9a, 9b, 9c, 9d Exhaust port 10 Pulley 11 Radiation fin 12 Rotating electrical machine unit 13 Power control unit 21 Belt 23 Engine 25 Crankshaft W Ventilation path WIN Cooling air WOUT Exhaust air

Claims (6)

A rotating electrical machine for a vehicle comprising: a rotating electrical machine unit; and a power control unit that is disposed adjacent to a rotational axis direction of the rotating electrical machine unit and controls the rotating electrical machine unit,
The power control unit
A cooling air introduction path for introducing cooling air toward the rotating shaft;
A ventilation hole connected to the cooling air introduction path and opened toward the rotating electrical machine part at the periphery of the rotating shaft;
A power control circuit is mounted, and includes a power control unit disposed so as to be cooled by cooling air from the cooling air introduction path toward the ventilation hole,
The rotating electrical machine part is
Provided with air blowing fins integrated with the rotor,
The rotating electrical machine for a vehicle according to claim 1, wherein the cooling air is introduced in accordance with a negative pressure generated by the rotation of the blower fins as the rotor rotates. The inlet of the cooling air introduction path opens in the radial direction,
The rotating electrical machine part is
In the housing that houses the rotor and the stator, the exhaust port for exhausting the cooling air,
2. The vehicle according to claim 1, wherein the exhaust port located on the power control unit side in the rotation axis direction is formed such that an exhaust amount is larger in a portion away from the intake port than in the vicinity of the intake port. Rotating electric machine. The exhaust port is
A first exhaust port disposed at a position adjacent to the intake port in the rotational axis direction;
A second exhaust port disposed in the circumferential direction adjacent to the first exhaust port,
The rotating electrical machine for a vehicle according to claim 2, wherein the first exhaust port has an opening area of the exhaust port smaller than that of the second exhaust port.   4. The rotating electrical machine for a vehicle according to claim 1, wherein the cooling air introduction path is disposed between the power control unit and the rotating electrical machine unit. 5.   5. The rotating electrical machine for a vehicle according to claim 1, wherein an intake port of the cooling air introduction path is opened toward a front side of the vehicle. The cooling air introduction path is formed by molding a wall having a good thermal conductivity,
The power control unit is disposed on an outer side surface of the wall surface, and a heat radiating fin is provided upright in the ventilation path from an inner side surface of the wall surface. The rotating electrical machine for vehicles as described.

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