JP5270718B2 - Electric power supply unit integrated rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that part of air exhausted by a fan bumps against a rear bracket to lose momentum and remains stagnant between the fan and the rear bracket, so that the stagnant air, while still hot, flows from a gap between the rear bracket and the outer periphery of a partition member into a suction path which is at negative pressure, making an electric power supply unit, a stator, a rotor, etc. insufficiently cooled. <P>SOLUTION: A rotary electric machine comprises: a rotor fitted to a rotor shaft; a stator enclosing the rotor; an electric power supply unit composed of a power circuit module for supplying electric power to an armature winding, a field circuit module for supplying electric power to a field winding, and a heat sink having radiation fins; a cooling fan for cooling the radiation fins; and a partition member having a vent hole, which divides a space between the fan and the electric power supply unit into two chambers to form a suction passage and an exhaust passage by inserting the rotor shaft through the vent hole. On the peripheral wall of a bracket are provided a suction port communicating with the suction passage and an exhaust port communicating with the exhaust passage. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to a rotating electric machine main body having a stator having an armature winding, a rotor having a field winding, and a housing that supports the stator and the rotor. The present invention relates to a power supply unit-integrated rotating electrical machine in which a power supply unit for supplying power is integrally attached.

In a conventional electric power supply unit-integrated rotating electrical machine, as shown in FIG. 12, a rear bracket is installed so as to cover a control board, each heat sink, and a switching element attached to each heat sink. A suction port is provided coaxially with the rotation shaft at the center of the rear bracket, and a suction port is provided around the suction port and directly opposed to the heat dissipation portion of each heat sink in the longitudinal direction of the rotation shaft. Yes.
A ventilation hole is provided coaxially with the rotary shaft at the center of the support plate / ventilation hole forming plate located between the fan and each heat sink. Due to the rotation of the fan, the cooling air sucked from the ventilation opening of the rear bracket passes through the heat radiating portions of the heat sinks, passes through the ventilation holes of the support plate / ventilation hole forming plate, and is rotated by the fan. The structure discharged radially outward of the part in the radial direction is disclosed (Patent Document 1).

JP 2006-174541 A (particularly FIG. 6)

13 is a cross-sectional view of the main part showing the vicinity of the intake / exhaust port of FIG. As shown in FIG. 13, in the conventional rotating electrical machine, part of the air exhausted by the fan collides with the rear bracket, loses momentum, and stays between the fan and the rear bracket. The retained air is heated and flows into the suction path, which is under negative pressure, through the gap between the rear bracket and the outer periphery of the partition member (hereinafter referred to as `` internal reflux '', this path is referred to as the `` reflux air path '') However, there is a problem that the power supply unit, the stator, and the rotor are not sufficiently cooled.
The present invention has been made to solve this problem. An electric power supply unit-integrated electric rotating machine having sufficient cooling performance by blocking internal reflux that causes deterioration in cooling performance or significantly reducing the reflux flow rate is provided. The purpose is to obtain.

A power supply unit-integrated rotating electrical machine according to the present invention includes a pair of brackets that are formed in a bottomed cylindrical shape and are connected to each other with an opening facing each other, a rotor shaft that is rotatably supported by both brackets, A rotor fitted with a child shaft and having a field winding, a stator arranged to surround the rotor and having an armature winding, and a power circuit module for supplying electric power to the armature winding of the stator And a field circuit module for supplying electric power to the field winding and a heat sink having a heat radiating fin for radiating heat generated from the two modules, and a power supply unit attached to the one bracket. A cooling fan attached to the end of the rotor shaft on the unit side for cooling the heat dissipating fins, and a vent hole larger in diameter than the rotor shaft. The space between the cooling fan and the power supply unit is partitioned into two chambers by inserting the rotor shaft into the rotor shaft, and the heat radiation fin is exposed to the power supply unit side through the vent hole. A partition member that forms an intake passage and an exhaust passage on the cooling fan side is provided, and the power supply unit and the partition member are integrally attached to the one bracket, and the peripheral wall of the bracket includes An air inlet communicating with the intake passage, and an air communicating with the exhaust passage and air sucked from the air intake by the negative pressure generated on the inner diameter side of the cooling fan when the cooling fan rotates. the through respectively an exhaust port for discharging to the outside after that led to the negative pressure portion of the cooling fan, brackets outer peripheral surface and one of said of said partition member A gap generated between, in which closes an elastic member.

  According to the electric power supply unit-integrated rotating electrical machine according to the present invention, the electric power supply unit is disposed in the rear bracket, and the internal reflux is appropriately disposed between the rear bracket, which is the internal reflux flow path, and the partition portion. Is prevented, and the power circuit module, the field circuit module, the stator, and the rotor can be effectively cooled. Further, there is an additional effect that vibrations transmitted from the rear bracket to the power supply unit can be isolated by the elastic body, and deterioration of cooling performance can be prevented because the intake port is not blocked.

It is sectional drawing which shows the electric power supply unit integrated rotary electric machine in Embodiment 1 of this invention. It is a perspective view which shows the rear bracket of the electric power supply unit integrated rotary electric machine in Embodiment 1 of this invention. It is the front view which looked at the rear bracket of the electric power supply unit integrated rotary electric machine in Embodiment 1 of this invention from the inner side. It is principal part sectional drawing of the rear bracket part of the electric power supply unit integrated rotary electric machine in Embodiment 1 of this invention. It is explanatory drawing which showed a part of the state which fixes the resin-made elastic member in the rear bracket part of the electric power supply unit integrated rotary electric machine in Embodiment 1 of this invention. It is the component figure which showed only the resin member of the electric power supply unit integrated rotary electric machine in Embodiment 2 of this invention alone. It is the front view inside a rear bracket which showed the state which mounted | wore the resin member of FIG. It is principal part sectional drawing of the rear bracket part of the electric power supply unit integrated rotary electric machine in Embodiment 3 of this invention. It is principal part sectional drawing of the rear bracket part of the electric power supply unit integrated rotary electric machine in Embodiment 4 of this invention. It is principal part sectional drawing of the rear bracket part of the electric power supply unit integrated rotary electric machine in Embodiment 5 of this invention. It is principal part sectional drawing of the rear bracket part of the electric power supply unit integrated rotary electric machine in Embodiment 6 of this invention. It is sectional drawing which shows the conventional electric power supply unit integrated rotary electric machine. In FIG. 12, it is principal part sectional drawing for demonstrating the mechanism in which internal recirculation | reflux generate | occur | produces.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition, the same code | symbol shows the same or an equivalent part between each figure.

Embodiment 1 FIG.
A power supply unit-integrated dynamoelectric machine according to Embodiment 1 of the present invention will be described with reference to FIGS.
The electric power supply unit-integrated dynamoelectric machine according to Embodiment 1 of the present invention is a pair of brackets that are formed in a bottomed cylindrical shape and are connected with their openings facing each other, that is, one bracket (hereinafter referred to as “front bracket”). ) A housing 100 including one and the other bracket (hereinafter referred to as “rear bracket”) 2, a rotor shaft 5 rotatably supported by both the brackets 1 and 2 as described later, and the rotor shaft A rotor 4 fitted with a field winding 6 and a stator 3 arranged so as to surround the rotor and having a stator core 3a and an armature winding 3b. It is supported and fixed by one end of the bracket 1 and one end of the rear bracket 2, and the rotor 4 is disposed inside the stator 3.

The rotor shaft 5 is rotatably supported by a support bearing 7 provided in the housing 100, and the rotor 4 is configured to be coaxial with the stator 3.
A cooling fan 8 is mounted on each end face of the rotor 4 in the axial direction. A pulley 9 is attached to an end of the rotor shaft 5 on the front side (outside of the front bracket), and a pair of slip rings 10 is mounted on an end of the rotor shaft 5 on the rear side (inside of the rear bracket). A pair of brushes 11 that are mounted and are in sliding contact with the slip ring 10 are disposed in the brush holder 12. The brush holder 12, the brush 11, and the slip ring 10 are for supplying DC power to the field winding 6.
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 power supply unit (heat sink assembly) 20 is attached to the rear bracket 2 and has a switching element and controls a power circuit module 22 that supplies power to the armature winding 3b of the stator and power supplied to the brush 11. The field circuit module 23 has a switching element for supplying electric power to the field winding 6, and the heat sink 21 has heat radiation fins 21 a for radiating heat generated from both the modules 22, 23. .

The power circuit module 22 and the field circuit module 23 are insulated and mounted on the outer surface of the plate-like mounting portion of the heat sink 21, and the brush holder 12 is attached to the inner surface that is the back surface of the heat sink 21. The power supply unit 20 is arranged inward (stator direction) from the end face of the rear bracket 2.
A control circuit 41 is provided in the external case 40, and a control signal is sent from the control circuit 41 to the power circuit module 22 and the field circuit module 23 via the connection connector 42.

  A substantially annular partition member 30 is provided in the space between the cooling fan 8 and the power supply unit 20. The partition member 30 has a vent hole 30c that is coaxial with the rotor shaft 5 and larger in diameter than the rotor shaft 5, and the cooling fan 8 and the power supply unit are inserted by inserting the rotor shaft 5 into the vent hole. An air intake passage 2A is formed in which the space between the two spaces is divided into two chambers, and the heat radiation fins 21a are exposed on the power supply unit side through the vent hole 30c, and an exhaust passage 2B is formed on the cooling fan 8 side. ing.

  The partition member 30 and the power supply unit 20 are arranged such as screws 26 from the front in the axial direction (stator direction) so as to sandwich the power supply unit 20 and the partition member 30 in screw holes provided on the end face of the rear bracket 2. By tightening the support member, the rear bracket 2 is fixedly supported, and the peripheral wall of the rear bracket 2 is provided with an intake port 2Aa communicating with the intake passage 2A and an exhaust port 2Bb communicating with the exhaust passage 2B, respectively. After the cooling fan 8 is rotated, air (cooling air) sucked from the intake port 2Aa by the negative pressure generated on the inner diameter side of the cooling fan is guided to the negative pressure portion of the cooling fan 8 through the vent hole 30c. The air is discharged from the exhaust port 2Bb to the outside.

1 and 2, arrows 50X and 50Y indicate the flow of the cooling air 50.
In the rear bracket 2 shown in FIG. 2, a long hole 2H opened so as to straddle the partition member 30 is opened on the side wall of the rear bracket 2, and an intake port 2Aa and an exhaust port 2Bb are formed by the long holes, respectively. Yes.
The cooling air 50 enters from the air inlet 2Aa and is sent out from the air outlet 2Bb as the intake air 50X and the exhaust air 50Y.

  When the rotation of the engine is transmitted to the rotating electrical machine via the pulley 9, air is discharged from the radially inner side to the outer side of the cooling fan 8 along with the rotation of the rotor 4, and the inner side of the cooling fan 8 becomes negative pressure. Become. Since the inside of the rotating electrical machine is partitioned by the partition member 30, air flows into the heat radiating fins 21a on the heat sink side of the partition member 30 and becomes intake air 50X, and becomes exhaust air 50Y on the cooling fan 8 side of the partition member 30.

  In the first embodiment, as shown in FIGS. 1 and 3, a resin member having elasticity to close a gap generated between the rear bracket 2 and the outer circumferential surface of the partition member 30 in order to prevent internal reflux (elasticity) Member) 31 is sandwiched. As a result, most of the internal reflux can be prevented from entering the suction path, so that the heat dissipation performance can be greatly improved.

In addition, as shown in FIGS. 4 and 5, the partition member 30 is provided with a protrusion 30a on the outer peripheral surface, or on a part of the outer periphery, and the resin member 31 is formed by the protrusion 30a. It is locked and fixed so as not to move rearward in the axial direction.
The resin member 31 has a structure in which after the power supply unit 20 is fixed to the rear bracket 2, the resin member 31 is inserted into a gap between the rear bracket 2 and the partition member 30 to block the return air passage.
Thereby, the resin member 31 is not detached from the partition member 30 during the assembly, and the assemblability is improved.

As shown in FIG. 5, a notch 30b is formed in the protrusion 30a of the partition member 30, and a mushroom-like protrusion locking portion (hereinafter referred to as “fixing protrusion”) 31a is formed in the resin member 31. The fixing protrusion 31a fits into the notch 30b of the partition member and is fixed in the axial direction, thereby preventing the resin member 31 from falling off.
As described above, the resin member 31 closes the reflux path, thereby greatly reducing the exhaust gas recirculating and dramatically improving the heat dissipation performance.

Since the rear bracket 2 is subjected to mass such as the power supply unit 20 and the outer case 40, the rear bracket 2 vibrates greatly due to vibrations from the vehicle.
The resin member 31 has an effect of isolating vibration transmitted from the rear bracket 2 to the power supply unit 20, and can suppress vibration of the power supply unit 20. Moreover, the partition member 30 and the resin member 31 are configured to be hooked, and the resin member 31 is inserted after the power supply unit 20 is assembled to the rear bracket 2, so that the resin member 31 is separated from the partition member 30 regardless of the operator. It is possible to securely fix them to each other, and productivity can be improved.

Embodiment 2. FIG.
FIG. 6 is a component diagram showing only the resin member of the electric power supply unit-integrated dynamoelectric machine according to Embodiment 2 of the present invention, and FIG. 7 is an inner view of the rear bracket showing a state where the resin member of FIG. 6 is mounted. FIG.

The resin member 31 in the second embodiment has a substantially straight shape as shown in FIG.
As shown in FIG. 7, the resin member 31 is configured to be bent and attached to the partition member 30 in a substantially annular shape after the power supply unit 20 is fixed to the rear bracket 2.
As in the first embodiment, the protrusion 30a of the partition member 30 is formed with a notch 30b, the resin member 31 is formed with a fixing protrusion 31a, and the notch 30b of the partition member 30 is The fixing protrusion 31a is fitted and the structure is fixed in the axial direction.
By producing the resin member 31 in a substantially straight shape instead of an annular shape, the productivity of the resin member 31 can be improved and the cost can be reduced.

Embodiment 3 FIG.
FIG. 8 is a cross-sectional view of the main part of the rear bracket portion of the electric power supply unit-integrated dynamoelectric machine according to Embodiment 3 of the present invention.
As shown in FIG. 8, the resin member 31 in the third embodiment is fixed to the protrusion 30 a of the partition member with an adhesive 32.
By fixing the resin member 31 to the partition member 30 with the adhesive 32, the resin member 31 does not move in the axial direction from a predetermined position, and the resin member 31 can be prevented from falling off.

Embodiment 4 FIG.
FIG. 9 is a cross-sectional view of the main part of the rear bracket portion of the electric power supply unit-integrated dynamoelectric machine according to Embodiment 4 of the present invention.
As shown in FIG. 9, the resin member 31 according to the fourth embodiment has both end portions 31 b inclined so as to abut each other. The resin member 31 is bent into a substantially annular shape and attached to the partition member 30. When it does, the diagonal shape of the both ends 31b has the structure which overlaps with an axial direction (or radial direction).
By comprising in this way, the recirculation | reflux from the clearance gap between the both ends of the resin member made into straight from the annular shape can be prevented.

Embodiment 5 FIG.
FIG. 10 is a cross-sectional view of the main part of the rear bracket portion of the electric power supply unit-integrated dynamoelectric machine according to Embodiment 5 of the present invention.
In the fifth embodiment, on the outer peripheral surface of the ring-shaped resin member 31, as shown in FIG. 10, bank-like protrusions 31 c are formed at all positions or corresponding to at least one position corresponding to the long hole 2H. The bank-shaped protrusion 31c is provided so as to project radially outward from the elongated hole 2H from the inner peripheral surface of the rear bracket 2 to divide the exhaust port 2Bb and the intake port 2Aa of the rear bracket 2. Are arranged as follows.
Further, the bank-like protrusion 31c forms a deflection exhaust guide 31d that discharges the cooling air 50 forward in the axial direction forward, and deflects the air so that the cooling air 50 is sucked in rearward in the axial direction. By forming the intake guide 31e, the intake flow and the exhaust flow are prevented from joining.

By configuring the resin member 31 as described above, the cooling air 50 can be prevented from being internally recirculated also on the radially outer side from the inner peripheral surface of the rear bracket 2, and the cooling performance can be further improved.
Further, by keeping the direction of the intake of the cooling air 50 away from the exhaust and keeping the direction of the exhaust of the cooling air 50 away from the intake, the internal recirculation of the cooling air 50 can be further prevented, and the cooling performance can be further improved. It becomes possible.

Embodiment 6 FIG.
FIG. 11 is a cross-sectional view of the main part of the rear bracket portion of the electric power supply unit-integrated dynamoelectric machine according to Embodiment 6 of the present invention.
As shown in FIG. 11, the resin member 31 in the sixth embodiment has a cylindrical extension portion that extends in the axial direction on the side surface thereof and fits to the inner peripheral surface of the one bracket.
The cylindrical extension 31f includes an exposed portion of a metal member 33 for electrically connecting the power circuit module 22 covered with the waterproof resin 25 and the power input / output terminal 3c of the stator winding 3b, and a rear portion. The metal member 33 is arranged in a gap with the bracket 2 and is separated from the rear bracket 2.
By configuring the resin member 31 in this way, the creeping distance between the rear bracket 2 and the metal member 33 can be increased. By preventing the resin member 31 from being exposed to the metal member 33, salt water or the like can be obtained. Corrosion of the metal member 33 due to moisture can be prevented.

1 Front bracket 2 Rear bracket 2H Slot 2A Intake passage 2Aa Intake port 2B Exhaust passage 2Bb Exhaust port 3 Stator 3a Stator core 3b Armature winding (stator winding) 3c Power input / output terminal of armature winding 4 Rotor 4a Rotor core 5 Rotor shaft 6 Field winding 7 Bearing 8 Cooling fan 9 Pulley 10 Slip ring 11 Brush 12 Brush holder 13 Power input / output terminal of rotating electrical machine 14 Magnetic pole position detection sensor 20 Power supply unit (heat sink) assembly)
21 Heat Sink 21a Heat Dissipation Fin 22 Power Circuit Module 22a Power Circuit Module Terminal 23 Field Circuit Module 24 Resin Case 25 Waterproof Resin 26 Power Supply Unit Fixing Screw 30 Partition Member 30a Protrusion 30b Partition Member Notch 30c Ventilation hole 31 Resin member (elastic member) 31a Mushroom-like protrusion locking portion (fixing protrusion)
31b Both end portions of resin member 31c Bank-like protrusion 31d Deflection exhaust guide 31e Deflection intake guide 31f Cylindrical extension (waterproof protrusion of resin member)
32 Adhesive material 33 Metal member 40 Outer case 41 Control circuit 42 Connector 50 Cooling air 50X Intake air 50Y Exhaust air.

Claims (11)

A pair of brackets formed in a bottomed cylindrical shape and connected to each other with their openings facing each other, a rotor shaft rotatably supported by both the brackets, and a rotation having a field winding fitted to the rotor shaft A stator having an armature winding disposed so as to surround the rotor, a power circuit module for supplying power to the armature winding of the stator, and a field for supplying power to the field winding A power supply unit composed of a circuit module and a heat sink having heat radiation fins that dissipate heat generated from both modules, and attached to the one bracket, and attached to the end of the rotor shaft on the power supply unit side A cooling fan that cools the heat dissipating fins, and a vent hole larger in diameter than the rotor shaft, and the rotor shaft is inserted into the vent hole so that the cooling shaft is inserted. The space between the fan and the power supply unit is divided into two chambers, and an intake passage is formed on the power supply unit side through which the heat dissipating fins are exposed, and exhausted to the cooling fan side. A partition member that forms a passage;
The power supply unit and the partition member are integrally attached to the one bracket, and an intake port communicating with the intake passage is formed on a peripheral wall of the bracket,
Air that is in communication with the exhaust passage and sucked from the intake port by the negative pressure generated on the inner diameter side of the cooling fan when the cooling fan rotates is led to the negative pressure portion of the cooling fan through the vent hole. An electric power supply unit-integrated dynamoelectric machine characterized in that an exhaust port for discharging to the outside is provided, and a gap generated between the outer peripheral surface of the partition member and the one bracket is closed with an elastic member .   2. The power supply unit-integrated rotation according to claim 1, wherein the intake port and the exhaust port are formed by elongated holes that are opened on the peripheral surface of the one bracket so as to straddle the partition member. Electric. 3. The electric power supply unit-integrated dynamoelectric machine according to claim 1 , wherein the elastic member is attached after the power supply unit and the partition member are attached to the one bracket . 3. The axial movement of the elastic member according to claim 1, wherein the elastic member is prevented from moving outward in an axial direction by being locked to a protrusion formed on an outer peripheral edge of the partition member . Electric power supply unit integrated rotating electric machine. The elastic member is fixed to the partition member by providing a plurality of protruding locking portions on the side surface and fitting the protruding locking portions into notches provided in the protruding portions of the partition member. The electric power supply unit-integrated dynamoelectric machine according to claim 1 or 2 , characterized in that The electric power supply unit-integrated dynamoelectric machine according to claim 1 or 2 , wherein the elastic member is fixed to the protrusion by an adhesive . 3. The power supply according to claim 1 , wherein the elastic member is a substantially straight belt, and the substantially straight belt is bent into a substantially annular shape and fixed to the partition member. 4. Unit-integrated rotating electrical machine. The said elastic member is made into the slanting shape which mutually abuts both end surfaces, and when the said elastic member is mounted | worn with the said partition member, both abutting surfaces overlap in an axial direction or radial direction, It is characterized by the above-mentioned. Electric power supply unit integrated rotary electric machine. 3. The elastic member according to claim 1, wherein a protrusion is provided on an outer peripheral surface of the elastic member so as to protrude from the elongated hole to the outside of the one bracket and to divide the exhaust port and the intake port. The electric power supply unit integrated rotating electric machine as described. 10. The power supply unit according to claim 9, wherein the elastic member is a deflection guide that prevents the intake flow and the exhaust flow from merging by projecting the protrusion from the elongated hole in a divergent shape. Integrated rotating electric machine. The elastic member is provided on its side surface with a cylindrical extension that fits to the inner peripheral surface of the one bracket, and the cylindrical extension extends the power circuit module and the power input / output terminal of the stator winding. The electric power supply unit-integrated dynamoelectric machine according to claim 1 or 2 , wherein a metal member to be electrically connected is insulated and isolated from the one bracket .

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