JP5368532B2 - Electric power supply unit integrated rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a rotary electric machine integral with a power supply unit, which reduces the effects of back flow without extending the axial length to improve cooling performance. <P>SOLUTION: In a rotary electric machine integral with a power supply unit, a power circuit 13 which conducts a stator current to a stator winding 3b is mounted on the rear outside of a rear bracket 2 of a rotary electric machine 100, the power circuit 13 being provided with a switching element 14 to switch the stator current and a heat sink 18 to cool the switching element 14, and a cooling air W produced by a cooling fan 8 attached to a shaft 4 of the rotary electric machine 100 flows in through a space between the power circuit 13 and the rear bracket 2 and is discharged via the inner periphery of the rear bracket 2 from an exhaust hole 23 formed on the outer periphery of the rear bracket 2. The rotary electric machine integral with a power supply unit includes between the rear bracket 2 and the power circuit 13 a cooling air back flow prevention member 20 which prevents the cooling air W discharged from the exhaust hole 23 from flowing back into the space between the power circuit 13 and the rear bracket 2. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to a power supply unit-integrated rotary electric machine in which a power supply unit for supplying power to a stator winding or a field winding of the rotary electric machine is integrally attached to the rotary electric machine main body.

  In a general rotating electrical machine for a vehicle, a separate type in which an inverter for controlling the rotating electrical machine is mounted in a place different from the rotating electrical machine in a vehicle has been put into practical use. When configured separately, there is a problem that it is necessary to secure a separate space for mounting the inverter in the vehicle, or that a loss due to the length of the harness connecting the rotating electrical machine and the inverter occurs. there were. In order to solve such a problem, various electric power supply unit-integrated rotating electrical machines have been developed.

  As an example of the conventional apparatus, Japanese Patent Application Laid-Open No. 2007-189868 (Patent Document 1) includes an inverter power circuit having a switching element mounted thereon with a predetermined gap in the axial direction of the rotating electrical machine on the rear bracket of the rotating electrical machine body. A controller-integrated rotating electrical machine that cools the inverter power circuit with cooling air generated by a fan is disclosed.

JP 2007-189868 A

  In the above conventional controller-integrated rotating electrical machine, the distance between the cooling air exhaust port and the intake port is short, so the air that has been warmed and exhausted is sucked again from the intake port, and sufficient cooling performance cannot be obtained. There is a problem with the recirculation of the cooling air, and if the intake port is moved away from the exhaust port in order to reduce the influence of the recirculation, it is necessary to move the inverter power circuit in the opposite direction to the rotating electrical machine. There was a problem that the shaft length was extended.

  In addition, since the switching element of the inverter power circuit has a lower allowable temperature than the rectifying diode, the effect of the reflux is more pronounced in the controller-integrated rotating electric machine than in the on-vehicle rotating electric machine constituted by the rectifying diode. Cooling performance will be affected.

  The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a power supply unit-integrated dynamoelectric machine that reduces the influence of reflux without increasing the axial length and improves cooling performance. It is what.

The electric power supply unit integrated rotating electric machine according to the present invention is an electric power supply unit in which an electric power supply unit for supplying electric power to a stator winding or a field winding of the electric rotating machine is integrated on the non-load side of the electric rotating machine. A body-type rotating electrical machine, wherein a power circuit for supplying a stator current to the stator winding is mounted on the rear outer side of the anti-load side bracket of the rotating electrical machine, and the power circuit switches the stator current. Cooling air from a cooling fan that is provided with a switching element and a heat sink that cools the switching element and is attached to the shaft of the rotating electrical machine flows through the space between the power circuit and the anti-load side bracket, and Power supply unit integrated rotation discharged from the exhaust hole provided on the outer periphery of the anti-load side bracket through the inner periphery of the load side bracket In the machine,
A cooling air recirculation preventing member for preventing the cooling air discharged from the exhaust hole from returning to the space between the power circuit and the anti-load side bracket between the anti-load side bracket and the power circuit; And the cooling air recirculation preventing member is fixed and held between the power circuit and the anti-load side bracket in a fixing and holding portion of the power circuit to the anti-load side bracket .

According to the electric power supply unit-integrated dynamoelectric machine according to the present invention, the cooling air return prevention member is disposed between the power circuit and the anti-load side bracket, and the cooling air return prevention member is disposed on the anti-load side of the power circuit. Since the fixing and holding portion to the bracket is fixed and held between the power circuit and the anti-load side bracket, the cooling air reflux preventing member can be firmly fixed without extending the shaft length, and the influence of the reflux can be reduced. The cooling performance can be improved.

It is sectional drawing of the electric power supply unit integrated rotary electric machine which concerns on Embodiment 1 of this invention. It is principal part sectional drawing of the electric power supply unit integrated rotary electric machine which concerns on Embodiment 1 of this invention. It is the figure seen from the non-load side of the inverter power circuit of the electric power supply unit integrated rotary electric machine which concerns on Embodiment 1 of this invention. It is the figure seen from the anti-load side of the cooling air recirculation | reflux prevention member of the electric power supply unit integrated rotary electric machine which concerns on Embodiment 1 of this invention. It is principal part sectional drawing of the electric power supply unit integrated rotary electric machine which concerns on Embodiment 1 of this invention. It is principal part sectional drawing of the electric power supply unit integrated rotary electric machine which concerns on Embodiment 2 of this invention. It is principal part sectional drawing of the electric power supply unit integrated rotary electric machine which concerns on Embodiment 3 of this invention. It is principal part sectional drawing of the electric power supply unit integrated rotary electric machine which concerns on Embodiment 3 of this invention. It is the figure seen from the anti-load side of the cooling air return prevention member of the electric power supply unit integrated rotary electric machine which concerns on Embodiment 3 of this invention. It is principal part sectional drawing of the electric power supply unit integrated rotary electric machine which concerns on Embodiment 4 of this invention.

  A preferred embodiment of a power supply unit-integrated dynamoelectric machine according to the present invention will be described below with reference to the drawings. The invention is not limited by these embodiments, and the embodiments can be combined, or the embodiments can be appropriately changed or omitted within the scope of the invention.

Embodiment 1 FIG.
1 is a cross-sectional view of an electric power supply unit-integrated dynamoelectric machine according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view of an essential part thereof, and FIG. FIG. 4 is a view of a cooling air recirculation preventing member (hereinafter referred to as a recirculation preventing member) as viewed from the anti-load side.
In these drawings, reference numeral 100 denotes a rotating electric machine, and reference numeral 200 denotes a power supply unit that supplies electric power to the rotating electric machine 100. The rotating electrical machine 100 includes a housing including a load side bracket (hereinafter referred to as a front bracket) 1 and an anti-load side bracket (hereinafter referred to as a rear bracket) 2, a stator having a stator core 3a and a stator winding 3b. 3 and a rotor 6 having a shaft 4 and a field winding 5. The stator 3 is supported and fixed by one end portion of the front bracket 1 and one end portion of the rear bracket 2, and the rotor 6 is disposed inside the stator 3. The shaft 4 of the rotor 6 is rotatably supported by a support bearing 7 provided in the housing, and the rotor 6 is configured to be able to rotate coaxially with the stator 3.

  Cooling fans 8 are fixed to both end surfaces of the rotor 6 in the axial direction. A pulley 9 is attached to an end portion of the shaft 4 on the load side (hereinafter referred to as the front side), that is, outside the front bracket 1, and a pair of slips on the anti-load side (hereinafter referred to as the rear side) of the shaft 4. A pair of brushes 11 that are attached to the ring 10 and are in sliding contact with the slip ring 10 are disposed in the brush holder 12. The pulley 9 is connected to the rotation shaft of the engine via a belt (not shown), and the rotation of the engine is transmitted to the pulley 9. The brush holder 12, the brush 11, and the slip ring 10 supply DC power to the field winding 5.

  A brush holder 12 and a power circuit, for example, an inverter power circuit 13 are disposed outside the rear bracket 2 and are mounted on the rear bracket 2. The inverter power circuit 13 includes a semiconductor switching element 14 that is a switching element that supplies current to the stator winding 3a and a power circuit module 16 that includes a case 15, a switching element that controls power supplied to the brush 11, and a rotating electrical machine. The control circuit module 17 includes a control circuit to be controlled and a case (see FIG. 3), and the power circuit module 16 and the heat sink 18 on which the control circuit module 17 is mounted. A resin case 19 is disposed on the rear side in the axial direction of the inverter power circuit 13 and the brush holder 12. The rear outer portion of the rear bracket 2 constitutes a power supply unit 200 that supplies power to the rotating electrical machine 100.

  The heat sink 18 is disposed between the rear bracket 2, the power circuit module 16, and the control circuit module 17. The fins 18 a of the heat sink 18 extend toward the rear bracket 2, and a reflux preventing member 20 is disposed between the rear outer surface of the rear bracket 2 and the heat sink 18. The reflux preventing member 20 is made of a metal member such as iron, copper, or aluminum.

  In this electric power supply unit-integrated rotating electric machine, when the rotor 6 is driven to rotate, the fan 8 is driven, and the cooling air W is provided in the outer periphery of the resin case 19 as indicated by the arrows in FIG. 21 is sucked from the heat sink 18 and passes through the fins 18 a of the heat sink 18 to cool the power circuit module 16 and the control circuit module 17. Then, the cooling air W passes through the ventilation holes 22 provided in the rear bracket 2 so that the air is sucked into the fan 8 and is bent in the centrifugal direction while cooling the stator winding 3b and the rear bracket 2. The gas is discharged from an exhaust hole 23 provided in the outer peripheral portion of the rear bracket 2. The reflux preventing member 20 is provided so as to overlap the exhaust hole 23 provided in the outer peripheral portion of the rear bracket 2 in the axial direction.

  Thus, by providing the reflux preventing member 20, the warm cooling air W from the exhaust hole 23 in the outer peripheral portion of the rear bracket 2 is sucked from the suction hole 21 provided in the outer periphery of the resin case 19. This prevents the cooling air W from flowing back. Therefore, the temperature rise of the inverter power circuit 13 can be suppressed. Further, since the temperature of the sucked cooling air W does not increase, the temperature rise of the rotating electrical machine 100 (stator 3, rotor 6) itself can be suppressed.

  Further, the inverter power circuit 13 is fixed to the rear bracket 2 by screws 24 (see FIG. 2), and as described above, the reflux preventing member 20 is sandwiched and fixed between the heat sink 18 and the rear bracket 2. ing. At this time, the inverter power circuit 13 and the reflux preventing member 20 are fixed and held by the same fixing and holding part 25 (see FIG. 4). Thus, by making the fixed holding part 25 of the inverter power circuit 13 and the reflux preventing member 20 the same place, the rotating electrical machine 100 can be reduced in size, and the reflux preventing member 20 can be firmly fixed. it can.

  The heat generated in the stator 3 is transferred from the stator 3 to the rear bracket 2 and the inverter power circuit 20, and the temperature of the inverter power circuit 13 rises. By using the metallic reflux prevention member 20, the rear bracket The amount of heat transmitted from 2 to the inverter power circuit 13 is dispersed into the amount of heat transmitted to the heat sink 18 and the amount of heat transmitted to the reflux preventing member 20. And since the recirculation | reflux prevention member 20 is also cooled by the cooling air W suck | inhaled from the suction hole 21, the calorie | heat amount which flows in into the inverter power circuit 13 can be reduced, and the temperature rise of the inverter power circuit 13 is suppressed. Can do. Further, the screws 24 for fixing the inverter power circuit 13 are not easily loosened, and the reliability is improved.

  Moreover, as shown in FIG. 5, you may bend the outer peripheral part 20a of the reflux prevention member 20 to the axial direction back side. Since the outer peripheral portion 20a of the reflux preventing member 20 is bent rearward in the axial direction and guided so that the cooling air W is easily sucked from the oblique rear side, the axial distance between the suction hole 21 and the discharge hole 23 becomes longer. It is possible to further prevent the cooling air W discharged from the discharge hole 23 from being recirculated through the suction hole 21 and further suppress the temperature increase of the inverter power circuit 13.

Embodiment 2. FIG.
Next, a power supply unit-integrated dynamoelectric machine according to Embodiment 2 of the present invention will be described. FIG. 6 is a cross-sectional view of a main part of the electric power supply unit-integrated dynamoelectric machine according to the second embodiment.
In the electric power supply unit-integrated dynamoelectric machine according to Embodiment 2, the reflux preventing member 30 is formed of a resin member, and has a shape in which an outer peripheral portion 30a is bent forward in the axial direction. Other configurations are the same as those in the first embodiment, and a description thereof will be omitted.

  Thus, in the electric power supply unit-integrated dynamoelectric machine according to the second embodiment, the cooling air W discharged from the discharge hole 23 is forward in the axial direction by bending the outer peripheral portion 30a of the reflux preventing member 30 forward in the axial direction. The direction is regulated so as to be discharged. Thereby, it is possible to prevent the cooling air W discharged from the discharge hole 23 from being recirculated through the suction hole 21, and to suppress the temperature rise of the inverter power circuit 13.

  In the present embodiment, the heat generated in the stator 3 is transmitted from the stator 3 to the rear bracket 2 and from the rear bracket 2 to the inverter power circuit 13, and the temperature of the inverter power circuit 13 rises. Since the manufactured reflux preventing member 30 is used, the amount of heat transmitted from the rear bracket 2 to the inverter power circuit 13 can be insulated by the reflux preventing member 30, and the amount of heat flowing from the rear bracket 2 to the inverter power circuit 13 is reduced. can do. Therefore, the temperature rise of the inverter power circuit 13 can be suppressed.

Embodiment 3 FIG.
Next, a power supply unit-integrated dynamoelectric machine according to Embodiment 3 of the present invention will be described. 7 and 8 are cross-sectional views of a main part of the electric power supply unit-integrated dynamoelectric machine according to Embodiment 3, and FIG. 9 is a view as seen from the rear side of the reflux preventing member.
7 to 9, in the third embodiment, the reflux preventing member 40 is molded by inserting a metal member 41 into a resin 42. A part of the resin portion 42 of the reflux preventing member 40 is configured to overlap the exhaust hole 23 provided in the outer peripheral portion of the rear bracket 2 in the axial direction, and the first protrusion 42a forward in the axial direction, A second protrusion 42b is provided on the rear side in the axial direction.

  The reflux preventing member 40 is configured as described above, and is guided by the second protrusion 42b so that the cooling air W is easily sucked from the obliquely rear side, and the axial distance between the suction hole 21 and the discharge hole 23 is long. Further, the direction is regulated so that the cooling air W discharged from the discharge hole 23 is discharged forward in the axial direction, so that the cooling air W discharged from the discharge hole 23 is recirculated through the suction hole 21. Can be prevented. Therefore, it is possible to suppress the temperature rise of the inverter power circuit 13.

  Further, the metal portion 41 of the reflux preventing member 40 is sandwiched between the inverter power circuit 13 and the rear bracket 2 by the fixed holding portion 25 of the inverter power circuit 13 and the rear bracket 2. With this configuration, as in the first embodiment, the amount of heat transmitted from the rear bracket 2 to the inverter power circuit 13 is dispersed into the amount of heat transmitted to the heat sink 18 and the amount of heat transmitted to the metal member 41 of the reflux preventing member 40, and from the suction hole 21. Since the metal member 41 of the reflux preventing member 40 is also cooled by the sucked cooling air W, the amount of heat flowing into the inverter power circuit 13 can be reduced. Therefore, the temperature rise of the inverter power circuit 13 can be suppressed.

  Further, in the present embodiment, as shown in FIG. 7, the resin portion 42 of the reflux preventing member is sandwiched between the fin 18 a of the heat sink 18 and the rear outer surface of the rear bracket 2. The reflux prevention member 40 can be suppressed not only by the inverter power circuit 13 and the fixing bracket 25 of the rear bracket 2 but also by the fins 18a of the heat sink 18 and the rear bracket 2, so that the reflux prevention member 40 can be more firmly fixed. it can. The configuration other than the above is the same as that of the first embodiment, and the description thereof is omitted.

Embodiment 4 FIG.
Next, a power supply unit-integrated dynamoelectric machine according to Embodiment 4 of the present invention will be described. FIG. 10 is a cross-sectional view of a main part of the electric power supply unit-integrated dynamoelectric machine according to the fourth embodiment.
In FIG. 10, in the fourth embodiment, a through hole 2a through which the input / output lead wire 3c of the stator winding 3b passes is formed in the rear bracket 2, and an inverter is used to supply current to the stator winding 3b. A terminal 13 a configured in the power circuit 13 and an input / output lead wire 3 c of the stator winding 3 b are connected to the outside of the rear bracket 2.

  The reflux preventing member 50 is provided with a protrusion 50a on the rear bracket 2 side, and this protrusion 50a is configured to close the gap between the through hole 2a and the input / output lead 3c of the stator winding 3b. Yes. The reflux preventing member 50 is also provided with a through hole 51 through which the input / output lead wire 3c of the stator winding 3b passes. The input / output lead wire 3c is guided by the through hole 51, and the inverter power circuit 13 The input / output lead wire 3c is connected to the terminal 13a.

  With this configuration, it is possible to prevent the cooling air W from flowing back from the through hole 2 a formed in the rear bracket 2. Therefore, the temperature rise of the inverter power circuit 13 can be suppressed.

DESCRIPTION OF SYMBOLS 1 Front bracket 2 Rear bracket 2a, 51 Through hole 3 Stator 3a Stator iron core 3b Stator winding 3c Input / output lead wire 4 Shaft 5 Field winding 6 Rotor 7 Support bearing 8 Cooling fan 9 Pulley 10 Slip ring DESCRIPTION OF SYMBOLS 11 Brush 12 Brush holder 13 Inverter power circuit 13a Terminal 14 Semiconductor switching element 15 Case 16 Power circuit module 17 Control circuit module 18 Heat sink 18a Fin 19 Resin case
20, 30, 40, 50 Cooling air reflux preventing member 20a, 30a Outer peripheral portion 21 Suction hole 22 Ventilation hole 23 Exhaust hole 41 Metal member 42 Resin 42a First protrusion 42b Second protrusion 50a Projection 100 Rotating electrical machine 200 Power supply unit W Cooling air

Claims (7)

A power supply unit-integrated dynamoelectric machine in which a power supply unit that supplies power to a stator winding or a field winding of a dynamoelectric machine is integrated on the antiload side of the dynamo,
A power circuit for supplying a stator current to the stator winding is mounted on the rear outside of the anti-load side bracket of the rotating electrical machine, and the power circuit includes a switching element for switching the stator current and the switching element. With a heat sink to cool,
Cooling air from a cooling fan attached to the shaft of the rotating electrical machine flows through the space between the power circuit and the anti-load side bracket, passes through the inner periphery of the anti-load side bracket, and the anti-load side bracket. In the electric power supply unit-integrated dynamoelectric machine discharged from the exhaust hole provided in the outer periphery,
A cooling air recirculation preventing member for preventing the cooling air discharged from the exhaust hole from returning to the space between the power circuit and the anti-load side bracket between the anti-load side bracket and the power circuit; A power supply unit characterized in that the cooling air recirculation preventing member is fixed and held between the power circuit and the anti-load side bracket in a fixing and holding portion of the power circuit to the anti-load side bracket. Body type rotating electrical machine. The heat sink is disposed between the anti-load side bracket and the switching element, and includes a fin extending toward the anti-load side bracket, and the cooling air cools the power circuit through the fin. The electric power supply unit-integrated dynamoelectric machine according to claim 1 . 3. The electric power supply unit-integrated dynamoelectric machine according to claim 1, wherein the cooling air recirculation preventing member is made of a metal member. 3. The electric power supply unit-integrated dynamoelectric machine according to claim 1, wherein the cooling air recirculation preventing member is made of a resin member. The cooling air recirculation preventing member is formed of a metal member inserted into a resin, and the metal member is sandwiched and held between the power circuit and the anti-load side bracket by the fixing and holding portion. Item 3. The electric power supply unit-integrated dynamoelectric machine according to Item 1 or 2 . Power supply unit-integrated electric rotating machine according to any one of claim 1 to 5, characterized in that a projecting portion for guiding said cooling air to said cooling air reflux prevention member. The cooling air reflux prevention member, any one of claims 1-6, characterized in that input and output leads of the anti-load side bracket which is formed in the stator winding is configured to close the through hole penetrating The electric power supply unit integrated rotary electric machine according to one item.

Images