JP2008187853A - Rotary electric machine device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a rotary electric machine device integral with a controller that allows size reduction of a heat sink by enhancing cooling efficiency, while preventing reflux of high-temperature cooling air discharged from a bracket to the machine outside. <P>SOLUTION: The rotary electric machine device is provided with a bracket 2, which has a power circuit part 8, provided at the axial one-side part with respect to a stator and an exhaust part 2a that holds the power circuit part, while being provided so that cooling air from a machine-outside direction through the power circuit part is discharged in the radiating direction at the one-side part of the stator, and an air-flow control member 13 that is provided at the exhaust part of the bracket so as to deflect the cooling air, discharged from the exhaust part, in the direction of the axial other-side part of the stator. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  INDUSTRIAL APPLICABILITY The present invention is preferably used as a control device-integrated rotating electrical machine device in which an inverter mounted on a vehicle such as a hybrid car, a control device, and the rotating electrical machine are integrated, particularly as a generator motor that also serves as a generator and a starting motor. The present invention relates to a rotating electrical machine device that can be used.

  A conventional rotating electrical machine integrated with a control device has a front bracket and a rear bracket that support a rotor with a fan and a stator, one heat sink mounted with a switching element, and a cover that covers the heat sink connected to the rear bracket. There is an air intake hole provided at one end so that the cooling air passes through the cooling fins of the heat sink and the stator and is discharged from the exhaust hole of the rear bracket (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2006-166538 (first page, FIG. 1)

  In the conventional rotating electrical machine as described above, the high-temperature air discharged from the rear bracket recirculates and re-enters through the air intake hole of the cover, and the temperature rises compared to the ambient temperature. As a result, the power circuit having the switching element mounted on the heat sink has a problem that the temperature similarly rises and may cause a failure. Further, in order to cool the temperature of the switching element under such a situation, it is necessary to enlarge the heat sink, and there is a problem that the apparatus is increased in size.

  The present invention has been made to solve the above-described problems of the prior art, and prevents the high-temperature cooling air discharged from the bracket from recirculating to the outside to improve the cooling efficiency and reduce the size of the heat sink. An object of the present invention is to provide a controller-integrated dynamoelectric machine that can be used.

  The rotating electrical machine apparatus according to the present invention includes a power circuit portion provided on one side in the axial direction with respect to the stator, and holding the power circuit portion, and cooling air that has passed through the power circuit portion from the outside of the machine receives the stator. A bracket having an exhaust portion provided so as to be discharged in a radial direction at one side portion of the stator, and cooling air provided at the exhaust portion of the bracket and discharged from the exhaust portion. And an airflow control member for deflecting in the direction.

  In the present invention, the airflow control member that deflects the discharged cooling air toward the other axial direction of the stator is provided in the exhaust portion of the bracket, so that the cooling air discharged from the exhaust portion can be moved in the axial direction of the bracket. By flowing in the direction of the other side, reflux is prevented and the cooling effect of the power circuit portion is enhanced. For this reason, the intake air temperature is reduced and the temperature of the heat sink is also reduced. As a result, the heat sink can be made small, and the apparatus can be miniaturized.

Embodiment 1 FIG.
1 to 3 illustrate a controller-integrated rotating electrical machine apparatus according to Embodiment 1 of the present invention. FIG. 1 is a side sectional view showing the overall configuration, and FIG. 2 is a rear view of the rotating electrical machine apparatus of FIG. The rear view seen from the bracket side, FIG. 3 is a perspective view which shows the airflow control member shown by FIG. In the drawings, the same reference numerals denote the same parts. In the figure, the controller-integrated dynamoelectric machine device 1 includes a rear bracket 2 as a bracket, a stator 4 supported by a front bracket 3, and the rear bracket 2 and the front bracket 3 that rotate via bearings 5A and 5B. A rotor 6 supported freely is provided, and the center of the rotor 6 is constituted by a shaft 7.

  On one side of the stator 4 in the axial direction (left direction and rear side in FIG. 1), a power circuit unit 8 for supplying current to the stator coil 4a wound around the stator 4 and the power circuit unit 8 are controlled. The control board 9 and a brush 10 for supplying a field current to the field winding 6 a of the rotor 6 are disposed. The power circuit unit 8 and the brush 10 are surrounded by a cover case 11 fixed to the rear bracket 2. The control board 9 is fixed to the outer portion (left side in FIG. 1) of the cover case 11 and covered with a lid 11a. A connector 12 for communicating with an engine control unit (not shown) is attached to the cover case 11, and the connector 12 and the control board 9 are connected by a signal line (not shown).

  The power circuit unit 8 includes an upper arm heat sink 81A, a switching element 82A, a lower arm heat sink 81B, and a switching element 82B, which constitute an ordinary general inverter circuit (not shown). The heat sinks 81A, 81B are terminals (not shown). ) Together with insulating members 83 and 84 sealed with resin through the cover case 11 in the axial direction. In FIG. 1, the portion of the V phase in the power circuit unit 8 composed of three phases of U, V, and W is shown. A fan 6b is mounted on one side of the rotor 6 in the axial direction (left side, rear end surface in the figure), and the cooling air sucked by the rotation of the fan 6b is indicated by a path indicated by a broken-line arrow A shown in FIG. Further, air is sucked in the axial direction from a plurality of intake holes 11b provided on the rear end face of the cover case 11 and communicating with the ventilation holes 2b of the rear bracket 2 and the exhaust part 2a, and the fins of the heat sinks 81A and 81B and the stator 4 Is passed through the stator coil 4a on one side and is discharged in the radial direction from the exhaust part 2a of the rear bracket 2.

  Then, in the exhaust part 2a on the lower side in FIG. 1 of the rear bracket 2, the cooling air discharged from the exhaust part 2a in the radial direction is directed toward the other side of the stator 4 in the axial direction (right direction in FIG. 1). An airflow control member 13 having a shape shown in FIG. 3 to be deflected is provided. The airflow control member 13 is attached so that a fixing portion (flange) 13a is sandwiched between the rear bracket 2 and the cover case 11, and the fin portion 13b is located between the right end surface of the cover case 11 and the exhaust portion 2a of the rear bracket 2. The cooling air that protrudes from the vicinity substantially outward in the axial direction and is bent so that the cooling air discharged from the exhaust part 2a is deflected in the axial other side direction (right direction in FIG. 1), and the radial direction of the exhaust part 2a The outer side extends away from the exhaust part 2a. The airflow control member 13 may be made of a resin, but it is desirable that the airflow control member 13 be made of metal when heat dissipation from the rear bracket 2 is taken into consideration.

  In addition, as shown in FIG. 2, the power circuit unit 8 composed of three phases of U, V, and W has a heat sink 81A for the upper arm of each phase of the U phase, the V phase, and the W phase, and a lower arm. A pair of heat sinks 81B are arranged separately in the circumferential direction. The plurality of air intake holes 11b of the cover case 11 are provided immediately before the heat sinks 81A and 81B of the U-phase, V-phase, and W-phase, respectively, as shown in FIG. All of the heat sinks 81A, 81 (6 in total) are provided so that the radiating fins can be directly seen through the intake holes 11b, and the outside air to be sucked directly hits the fins. In this example, the airflow control member 13 is installed only in the V-phase region where there is a large amount of reflux, but can also be installed in the U-phase region and the W-phase region as necessary.

  The airflow control member 13 can fasten the fixing portion (flange) 13a together with the heat sinks 81A and 81B to the cover case 11 with bolts 14 and nuts 15. Further, a pulley 16 is attached to the other axial side portion (the right end portion in FIG. 1) of the shaft 7, and the pulley 16 is connected to an output shaft of an engine (internal combustion engine) not shown. When the rotating electrical machine apparatus 1 is used as a generator, it is driven by the rotational force of the engine through the driving belt and the pulley 16, and when it is used as an engine starting motor, the battery is not shown. The engine crankshaft (not shown) is rotated via the pulley 16 and the drive belt by the electric power.

  Next, the operation of the first embodiment configured as described above will be described. Note that the operation of the rotating electrical machine device 1 as a generator or an electric motor is the same as that of a known conventional device, and a description thereof will be omitted. When the rotor 6 of the rotating electrical machine apparatus 1 rotates as a generator or an electric motor, outside air is taken into the cover case 11 from the outside of the machine by the fan 6b from the intake hole 11b of the cover case 11 as indicated by a broken line arrow A, and the heat sink 81A, Passing through the ventilation hole 2b of the rear bracket 2 through 81B, sequentially passing through the side of the stator coil 4a on one side of the stator 4 and discharged from the exhaust part 2a of the rear bracket 2 in the radial direction, and the airflow control member 13 Is deflected in the direction of the other side in the axial direction (right direction in FIG. 1) and discharged outside the apparatus.

  As described above, according to the first embodiment, the airflow control member 13 that deflects the discharged cooling air to the exhaust portion 2a of the rear bracket 2 in the axial direction other side portion direction (right side direction in FIG. 1) of the stator 4. Since the high-temperature cooling air exhausted from the exhaust part 2a is prevented from being recirculated, the cooling effect of the power circuit part 8 having the switching elements 82A and 82B is enhanced. As a result, the temperature of the heat sinks 81A and 81B is reduced, and the apparatus can be downsized. The air flow control member 13 also functions as a heat sink by conducting heat from the rear bracket 2, and reducing the temperature of the rear bracket 2 by increasing the contact area with the cooling air. Can do. As a result, the heat reception to the heat sinks 81A and 81B assembled to the rear bracket 2 is reduced, the heat sink temperature is reduced, and the apparatus can be downsized. Furthermore, it is possible to prevent foreign matter from entering from the exhaust portion 2a of the rear bracket 2, and it is possible to suppress damage to the product and improve reliability.

  In addition, in the conventional device, since a plurality of switching elements are mounted on one heat sink, there is a variation in switching element temperature due to thermal interference between the switching elements. Therefore, the switching element temperature is designed based on the maximum temperature. Therefore, it was necessary to enlarge the heat sink. On the other hand, in the first embodiment, the heat sink is divided into a plurality of parts, thereby reducing thermal interference with each phase and disposing the air flow control member 13 individually, thereby eliminating the local temperature distribution. Thus, the heat sink temperature can be reduced and the device can be downsized. Moreover, the airflow control member 13 can be installed only in a phase with a large reflux depending on the shape of the housing of the engine, and the component cost can be reduced. Furthermore, since reflux can be suppressed, it can be installed close to the engine housing, and the installation space can be reduced. Moreover, since the airflow control member 13 has a structure in which the heat sinks 81A and 81B and the cover case 11 are fastened together, the number of connection points is small, which is reasonable, and the component cost can be reduced.

Embodiment 2. FIG.
4 is a cross-sectional view showing a main part of a rotating electrical machine apparatus according to Embodiment 2 of the present invention. In the figure, the airflow control member 17 projects outward in the radial direction of the exhaust part 2a of the rear bracket 2 and covers the outside of the exhaust part 2a through an air passage, and then the direction of the other side of the stator 4 in the axial direction (see FIG. 4 is extended so as to extend in the right direction). Other configurations and reference numerals are the same as those in the first embodiment, and a description thereof will be omitted. In the second embodiment configured as described above, the cooling air has a path indicated by an arrow B, and is discharged from the front shaft direction to the outside of the apparatus, thereby further suppressing the reflux and a part of the cooling air. Is collided with the outer surface of the stator 4. Since the temperature of the stator 4 is higher than the exhaust temperature, the stator 4 is also cooled by the exhaust of the cooling air.

  As described above, according to the second embodiment, the air flow control member 17 is extended so as to extend long in the axial other side direction (the right side direction in FIG. 4), thereby further suppressing the reflux. In addition, a ventilation path for cooling the stator 4 can be formed. For this reason, the heat receiving from the stator 4 to the rear bracket 2 and the heat sinks 81A and 81B can be reduced, and the heat sink temperature can be reduced. As a result, the apparatus can be further downsized. Further, since the airflow control member 17 extends and extends long, the surface area increases, the contact area with the cooling air increases, and the temperature of the rear bracket 2 can be further reduced. In addition, it is possible to further prevent foreign matter from entering from the exhaust part 2a of the rear bracket 2, and it is possible to suppress damage to the product and improve reliability.

Embodiment 3 FIG.
5 is a cross-sectional view showing a main part of a rotating electrical machine apparatus according to Embodiment 3 of the present invention. The difference from the second embodiment is that the airflow control member 18 is provided with concavities and convexities formed of fins 18a on the inside and fins 18b on the outside. When the airflow control member 18 is made of metal, for example, the fins 18a and 18b may be provided with an uneven shape using a press or the like when formed. Moreover, you may cast integrally with resin. In addition, although this unevenness | corrugation has shown in the example provided in both surfaces of the airflow control member 18, even if it provides only in any one of an inner side and an outer side, of course, a suitable effect will be acquired. Since other configurations are the same as those of the second embodiment, description thereof is omitted.

  In the third embodiment configured as described above, the inner fin 18a is mainly used to forcibly cool the rear bracket 2 using the airflow control member 18 when the fan 6b rotates. On the other hand, the outer fins 18b are mainly used to naturally cool the rear bracket 2 using the airflow control member 18 after the fan 6b is stopped. In particular, since the fan 6b does not rotate in the engine stop state at the time of idling stop, the outer fin 18b does not rotate, but the heat sink 81A, 81B is not cooled and receives heat from the stator 4 as a heating element, but the temperature rises naturally. By being air-cooled, the temperature rise of the heat sinks 81A and 81B can be reduced, and idling can be efficiently stopped. Further, the cooling air collides with the convex portions of the fins 18 a of the airflow control member 18, so that a large amount of exhaust air flows toward the outer surface of the stator 4, whereby the stator 4 is also efficiently cooled.

  As described above, according to the third embodiment, the unevenness made up of the fins 18a and 18b is provided on the inner side and the outer side of the airflow control member 18, thereby reducing the temperature of the rear bracket 2 when the fan 6b rotates and stops. can do. For this reason, an apparatus can be reduced in size by also suppressing the temperature rise of heat sink 81A, 81B. Further, the fins 18a and 18b perform forced cooling of the airflow control member 18 and the stator 4 during rotation, and natural cooling of the airflow control member 18 is promoted when stopped, thereby reducing the temperature of the switching elements 82A and 82B. Idling stop can be performed efficiently. In addition, the flow of cooling air toward the outer surface of the stator 4 can reduce the temperature of the stator 4 and reduce the heat reception of the heat sinks 81A and 81B, thereby reducing the size of the apparatus. Further, by providing the airflow control member 18 with the irregularities made of the fins 18a and 18b, the airflow control member 18 is improved in rigidity and vibration resistance is improved.

Embodiment 4 FIG.
6 is a cross-sectional view showing a main part of a rotating electrical machine apparatus according to Embodiment 4 of the present invention. In the fourth embodiment, the airflow control member 17 and the cover case 11 shown in the second embodiment are integrally formed to form a cover case 19 with an airflow control member. Note that an air intake hole 19a is provided on the left end side of the cover case 19 with the airflow control member in the drawing, and an airflow control unit 19b is formed on the right end side. Since other configurations are the same as those of the second embodiment, description thereof is omitted.
In the fourth embodiment, the other air flow control unit 19b that obtains the same effect as that of the second embodiment is resin-molded integrally with the cover case, thereby reducing the number of parts and the workability. It becomes better and can be made cheap and simple. Moreover, by being integrated, the rigidity of the airflow control part 19b is improved, and the effect that vibration resistance can be improved is also obtained.

  In the above description of the embodiment, the case where the rotating electrical machine apparatus 1 is used as a generator / starting motor such as a hybrid car has been described. However, the application and usage method are not necessarily limited to the embodiment. Needless to say. Moreover, although the case where the power circuit unit 8 is provided on the rear bracket 2 side has been described, it may be installed on the front bracket 3 side. In addition, for example, a heat sensor that detects the temperature of the power circuit unit 8 is provided, and when the heat sensor exceeds a predetermined value when idling is stopped, the electric fan is rotated by a battery that is provided as standard in the vehicle. It goes without saying that various modifications and changes can be made within the spirit of the present invention, such as adding a cooling function.

BRIEF DESCRIPTION OF THE DRAWINGS Side surface sectional drawing which shows the whole structure of the rotary electric machine apparatus of the control apparatus integrated type by Embodiment 1 of this invention. The rear view which looked at the rotary electric machine apparatus of FIG. 1 from the rear bracket side. The perspective view which shows the airflow control member shown by FIG. Sectional drawing which shows the principal part of the rotary electric machine apparatus by Embodiment 2 of this invention. Sectional drawing which shows the principal part of the rotary electric machine apparatus by Embodiment 3 of this invention. Sectional drawing which shows the principal part of the rotary electric machine apparatus by Embodiment 4 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Rotating electrical machinery apparatus, 2 Rear bracket (bracket), 2a Exhaust part, 2b Ventilation hole, 3 Front bracket, 4 Stator, 4a Stator coil, 5A, 5B Bearing, 6 Rotor, 6a Field winding, 6b Fan, 7 Shaft , 8 Power circuit part, 81A, 81B Heat sink, 82A, 82B Switching element, 83, 84 Insulating member, 9 Control board, 10 Brush, 11 Cover case, 11a Lid, 11b Air intake hole, 12 Connector, 13, 17, 18 Airflow Control member, 13a fixing part (flange), 13b fin part, 14 bolt, 15 nut, 16 pulley, 18a, 18b fin (unevenness), 19 cover case with airflow control member, 19a air intake hole, 19b airflow control part.

Claims (6)

  A power circuit portion provided on one side in the axial direction with respect to the stator, and holding the power circuit portion, and cooling air passing through the power circuit portion from the outside of the machine is exhausted in a radial direction at one side of the stator. A bracket having an exhaust portion provided as described above, and an airflow control member provided in the exhaust portion of the bracket and deflecting the cooling air discharged from the exhaust portion toward the other side of the stator in the axial direction. A rotating electrical machine apparatus integrated with a control device.   The said power circuit part is provided with the some heat sink divided | segmented and arrange | positioned by the circumferential direction of the said stator, The said airflow control member is arrange | positioned according to this several heat sink. The rotating electrical machine apparatus described.   The airflow control member is formed so as to protrude outward in the radial direction of the exhaust part and cover the outer part of the exhaust part, and then extend and extend in the other axial direction of the stator. The rotating electrical machine apparatus according to claim 1 or 2, characterized in that   The rotating electrical machine apparatus according to any one of claims 1 to 3, wherein the airflow control member has irregularities formed on a surface thereof.   The bracket includes a rear bracket having a ventilation hole for allowing cooling air to flow in the axial direction toward the stator, and the power circuit portion is disposed on the outer side of the ventilation hole of the rear bracket, and the rear bracket 5. A cover case having an air intake hole that is fixed to the air circuit and surrounds the power circuit portion and communicates with the ventilation hole for allowing outside air to flow in from the outside in the axial direction. The rotary electric machine apparatus in any one of.   The rotating electrical machine apparatus according to claim 5, wherein the airflow control member is formed integrally with the cover case.

Images