JP4325065B2 - Rotating electric machine for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicular rotating electrical machine suitable for driving wheels.
[0002]
[Prior art]
In a conventional radial air gap type rotating electrical machine, the outer peripheral surface of the stator core is usually fixed to the inner peripheral surface of the housing.
[0003]
[Problems to be solved by the invention]
However, in a radial air gap type rotating electrical machine, in the stator core one-end support structure in which one end of the rotor in the axial direction is coupled to the rotating shaft and the stator core is disposed inside the rotor diameter, the rotor core One end in the axial direction of the stator is supported by the rotating shaft through the rotor frame, and the other end in the axial direction of the stator core is supported by the housing. Therefore, a high heat generating member such as a stator and a rotor is used as a housing or a rotor frame. It was found that it was necessary to enclose with a member, and as a result, the stator and the rotor were newly overheated.
[0004]
In the conventional radial air gap type rotating electrical machine that is fixed to the outer peripheral surface of the stator core on the inner peripheral surface of the housing, the both ends of the stator core and the rotor core are exposed to the outside. This is the point that it can be contact-cooled by a cooling air flow taken from the outside through the opening, and does not become a big problem.
[0005]
The present invention has been made in view of the above-described problems, and is one end of a stator core excellent in the cooling performance of the rotor and the stator, particularly in the cooling performance of the rotor and the stator on the rotor frame side. An object of the present invention is to provide a vehicular rotating electrical machine using a radial air gap type rotating electrical machine having a support structure.
[0006]
[Means for Solving the Problems]
The rotating electrical machine for a vehicle according to claim 1, which solves the above problem, includes a rotor having a rotor core fixed to a rotating shaft, a stator core having a peripheral surface facing the peripheral surface of the rotor, and the fixing. In a rotating electrical machine for a vehicle having a stator winding wound around a core and a stator fixed to a housing,
The rotor includes an outer rotor portion whose inner peripheral surface is electromagnetically coupled to the outer peripheral surface of the stator, an inner rotor portion whose outer peripheral surface is electromagnetically coupled to the inner peripheral surface of the stator, and an axial direction of the two rotor portions. A rotor frame that couples the outer rotor portion and the inner rotor portion to the rotating shaft on the side opposite to the housing, and the stator core is fixed to the housing on the side opposite to the rotor frame, and the rotor frame is An air suction hole for allowing air to flow into the gap between the stator and the rotor frame, and an air suction hole formed on an end surface on the stator core side that is located outside the air suction hole. It is characterized by having a centrifugal blade for urging the air sucked through the hole outward .
[0007]
That is, in this configuration, the rotor frame has an air suction hole for taking in air from the outside in a gap extending between the rotor and the stator and the rotor frame in a substantially radial direction. The portion facing the rotor frame and having the lowest cooling ability and the highest temperature can be satisfactorily cooled by airflow contact. In this way, the cooling effect can be improved with a simple configuration, and the manufacture is facilitated by integrally forming the rotor frame and the blades.
[0017]
Further, according to the configuration of claim 1, wherein B - Tafure - arm, the air suction hole of the cooling air are formed positioned radially inward than the air suction hole to the end surface of the anti stator core side It is characterized by having a wing that feeds into the.
[0018]
If it does in this way, a cooling effect can be improved with simple composition, and manufacture will also become easy by integrally forming a rotor frame and a wing. According to the configuration of the second aspect of the present invention, in the rotating electrical machine for a vehicle according to the first aspect, the rotor frame is formed on the end face on the side opposite to the stator core and located on the inner side of the air suction hole. The air suction hole is configured to urge the air inside the air suction hole to the gap side. In this way, air can be easily urged in the axial direction or the radial direction by setting the opening direction of the air suction hole, and it can also serve as a so-called fan. Further, the cooling effect can be improved with a simple configuration, and the manufacture is facilitated by integrally forming the rotor frame and the blades.
[0019]
The vehicle rotary electric machine according to claim 1 or 2, wherein according to the vehicle electric rotating machine according to claim 3, wherein the stator core is inserted and a through hole formed through axially in the through hole wherein And a heat transfer member reaching the housing.
[0020]
In this way, the stator core that is likely to be insufficiently cooled due to the above reason can be satisfactorily cooled, and the stator core and the housing can be integrated by this heat transfer member. The vibration resistance of the core can be improved.
[0021]
As the heat transfer member, a metal or a bar or a heat pipe excellent in thermal conductivity can be adopted. However, even if fine heat conductive thin wires having an insulating coating are gathered to reduce eddy currents. Good.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of a vehicular rotating electrical machine of the present invention will be described below with reference to the drawings.
[0023]
[Example 1]
An embodiment in which the vehicular rotating electrical machine of the present invention is applied to an internal combustion engine driven vehicle will be described below.
[0024]
(Overall structure)
FIG. 1 is a schematic cross-sectional view in the axial direction showing the vicinity of a rotating electrical machine for a vehicle of a power train of this internal combustion engine driven vehicle.
[0025]
Reference numeral 100 denotes a housing, 101 denotes an engine crankshaft, 400 denotes a clutch mechanism, 500 denotes an input shaft of a gear mechanism (not shown), and 1 denotes a vehicular rotating electrical machine.
[0026]
The vehicular rotating electrical machine 1 includes a stator 2, an outer rotor portion 3, an inner rotor portion 4, a rotor support frame 5, and a rod-like support member 7.
[0027]
The outer rotor portion 3 and the inner rotor portion 4 constitute a rotor referred to in the present invention, and the inner peripheral surface of the outer rotor portion 3 is electromagnetically coupled to the outer peripheral surface of the stator 2 with a small electromagnetic gap therebetween. The outer peripheral surface of the portion 4 is electromagnetically coupled to the outer peripheral surface of the stator 2 with a small electromagnetic gap.
[0028]
Both rotor parts 3 and 4 are known embedded permanent magnet type rotors composed of laminated electromagnetic steel sheets 31 and 41 in which permanent magnets are embedded. The permanent magnets of the rotor unit 3 are formed in a thin plate shape and individually embedded in a number of permanent magnet housing grooves that are provided in the laminated electromagnetic steel sheet 31 so as to penetrate in the axial direction in the circumferential direction. Is formed in a thin plate shape, and is individually embedded in a number of permanent magnet housing grooves 700 (see FIG. 5) penetrating in the laminated electromagnetic steel plate 41 in the axial direction at a constant pitch in the circumferential direction.
[0029]
The permanent magnets of both rotor parts 3 and 4 are magnetized in the thickness direction, that is, in the substantially radial direction. The permanent magnets of both rotor parts 3 and 4 are embedded at equal positions in the circumferential direction, and the permanent magnets at the same position in the circumferential direction have magnetic poles of the same polarity on the stator 2 side. As a result, magnetic pole surfaces are formed at a predetermined pitch in the circumferential direction on the inner circumferential surface of the laminated electromagnetic steel sheet 31 and the inner circumferential surface of the laminated electromagnetic steel sheet 41 at the same circumferential position as the permanent magnet. It has the same polarity as the magnetic pole surface of the rotor portion 4 at the same position in the circumferential direction.
[0030]
The rotor support frame 5 extends in the radial direction, an outer cylindrical portion 51 to which the outer peripheral surface of the outer rotor portion 3 is fixed, an inner cylindrical portion 52 to which the inner peripheral surface of the inner rotor portion 4 is fixed. And the disc part 53 which connects the end parts on the rear side of both the cylinder parts 51 and 52, and the front end of the inner cylinder part 52 is fastened to the crankshaft 101.
[0031]
The stator 2 is wound around a stator core 20 disposed in a radial gap between the outer rotor portion 3 and the inner rotor portion 4 and is electromagnetically coupled to the rotor portions 3 and 4 (stator winding ( Armature coil) 21.
[0032]
The stator core 20 is made of a laminated electromagnetic steel sheet obtained by laminating a large number of electromagnetic steel sheets having a ring shape in the axial direction. If described with reference to a partial development view of FIG. A large number of outer peripheral slots 202 and teeth 203 formed at a predetermined pitch in the circumferential direction on the radially outer side of 201, and a plurality of inner peripheral slots 204 and teeth formed at a predetermined circumferential direction on the inner side in the radial direction of the core back 201. 205.
[0033]
(Description of the stator core 20 and the rod-like support member 7)
The stator core 20 and the rod-like support member 7 will be described with reference to FIGS. The stator core 20 has seven holes 200 that are axially penetrated at predetermined positions in the circumferential direction of the teeth, one of which is one slot pitch counterclockwise from the rotationally symmetric position with respect to all the others. It is off.
[0034]
In each hole 200, a bolt-shaped rod-like support member 7 is press-fitted.
[0035]
The distal end portion of the rod-like support member 7 passes through the through hole 102 opened in the axial direction in the radial wall portion 100a of the housing 100, and a nut 71 is screwed into the screw portion 70 formed at the distal end portion. ing.
[0036]
The rod-shaped support member 7 has a large-diameter portion 72, and the large-diameter portion 72 is in contact with a stepped portion 103 formed in the through hole 102. More specifically, the front end surface portion of the large-diameter portion 72 abuts against a seating surface (positioning end surface) formed in the radial direction of the stepped portion 103, whereby the nut 71 and the front end surface portion of the large-diameter portion 72 are in contact with the housing 100. The radial wall portion 100a is clamped in the axial direction. Thereby, the axial position of the stator core 20 is determined.
[0037]
The outer peripheral surface of the large-diameter portion 72 is in contact with the inner peripheral surface (positioning peripheral surface) of the stepped portion 103, whereby the radial position of the rod-like support member 7 is determined. The portion on the tip side of the large diameter portion 72 is formed to be smaller in diameter than the large diameter portion 72 and can be easily inserted into the through hole 102. Reference numeral 72 a denotes a large-diameter head of the rod-like support member 7, which is in contact with the rear end surface of the stator core 20.
(Winding of stator winding)
If the stator winding 21 is described with reference to a partial development view of FIG. 4, the concentrated winding coil portion 210 concentratedly wound on the outer peripheral side slot 202 and the inner peripheral side slot 204 at the same position in the circumferential direction is arranged on the outer peripheral side. The number of slots 202 is equal to the number of slots (= the number of slots of the inner peripheral side slot 204). However, FIG. 4 shows only the U-phase concentrated winding coil portion 210. Therefore, the rod-shaped support member 7 is located between two concentrated winding coil portions 210 adjacent in the circumferential direction and penetrates the core back 201.
[0038]
The winding start end 2101 and the winding end end 2102 of each concentrated winding coil part 210 are projected to the front side in the axial direction, and each phase winding of the star-connected stator winding 21 is connected to all concentrated winding coil parts 210 of the same phase. Are connected in parallel (see FIG. 4). Each U-phase concentrated winding coil section 210 is wound every three slots. However, in order to reverse the energization direction of the odd-numbered concentrated winding coil portion 210 and the even-numbered concentrated winding coil portion 210, as shown in FIG. 4, the winding start end 2101 of the odd-numbered concentrated winding coil portion 210 is provided. And the winding end end 2102 of the even-numbered concentrated winding coil portion 210 is connected to the U-phase output end portion 91, and similarly the winding start end 2101 of the even-numbered concentrated winding coil portion 210 and the winding of the odd-numbered concentrated winding coil portion The end end 2102 is connected to a neutral point terminal portion 94 that forms a neutral point.
(Operation)
Next, the operation of this vehicular rotating electrical machine will be described.
[0039]
The vehicular rotating electrical machine 1 is a three-phase synchronous machine, and the position of the rotor is detected by a rotation sensor (not shown). When a three-phase AC voltage having a phase corresponding to the position of the rotor is applied to the star-connected stator winding 21, the outer rotor portion 3 and the inner rotor portion 4 are applied to the outer rotor portion 3 and the inner rotor portion 4 by the rotating magnetic fields respectively formed by the stator windings 21. Torque is generated, and the vehicular rotating electrical machine 1 starts the internal combustion engine through the crankshaft 101. Thereafter, the vehicular rotating electrical machine 1 performs torque assist, regenerative braking, or power generation in the same manner as a conventional vehicular rotating electrical machine.
[0040]
According to the vehicle rotary electric machine of this embodiment, a small and high-output vehicle rotary electric machine can be realized, and in particular, the coil end portion of the stator winding 21 is conventionally divided without dividing the stator core 20. Further reduction can be achieved, and one end support of the stator core 20 is facilitated.
(Cooling structure of rotor and stator)
Next, the cooling structure of the rotating electrical machine for a vehicle will be described below with reference to FIG.
[0041]
The rotor support frame 5 has air suction holes 601 and 602 in the radially inner portion of the disk portion 53 and air discharge holes 603 in the vicinity of the outer peripheral edge of the disk portion 53, and each of the holes 601 to 603 rotates. A predetermined axial gap (gap in the present invention) g formed between the cores 3 and 3 and the stator 2 and the rotor frame 5 communicates with the outside.
[0042]
By the rotation of the rotor frame 5, these holes 601 to 603 have a centrifugal fan effect and suck air from the outside into the gap g. In each of the holes 601 to 603, the outer diameter opening is displaced by a predetermined angle in the counter-rotating direction as compared with the inner diameter opening, so that a smooth air flow can be formed. The air flow cools the gap g while contacting the surfaces of the rotor 3 and the stator 2 in a spiral manner, and is discharged from the air discharge hole 603.
[0043]
Further, in this embodiment, the two rotor cores (rotor cores) 31 each have a large number of permanent magnet accommodation grooves (through holes) 700 that penetrate in the axial direction as described above. The permanent magnet housing grooves (through holes) 700 are formed at regular intervals in the circumferential direction, and allow air in the gap g to flow in the axial direction. Thereby, the rotor core 31 is also cooled well. In addition, although the permanent magnet accommodation groove | channel (through-hole) 700 is formed in the circumferential direction both sides of a permanent magnet (not shown), both ends of this permanent magnet accommodation groove | channel (through-hole) 700 are curved to the stator 2 side. Thus, a magnetic salient pole portion can be formed on the rotor core 31 to generate a so-called reluctance torque.
[0044]
Further, the already described rod-like support member 7 is made of steel and formed in a cylindrical shape, and has a through hole in the center. The through hole is embedded with copper that transfers heat well. If it does in this way, the rod-shaped support member 7 will transmit the heat | fever of the stator core 20 to the radial direction wall part 100a of the housing 100 favorably.
[0045]
A rod-shaped support member 7 is provided with a heat pipe function by forming a long sealed space in the axial direction inside the rod-shaped support member 7 and partially sealing a liquid boiling at several tens of degrees Celsius. Also good.
[0046]
Further, grooves that extend in the axial direction at regular intervals in the circumferential direction may be formed on the surface of the rod-shaped support member 7, and these grooves may be used as an air flow passage. In addition, the thermal conductivity of the rod-like support member 7 may be improved by embedding a copper wire in these grooves.
[0047]
Furthermore, a large number of through holes may be provided in the stator core 20 in the axial direction at positions where the rod-like support member 7 is not disposed and at the circumferential teeth position where the concentrated winding coil portion 210 is not disposed, and these through holes may be used as cooling air passages. These heat transfer members may be embedded in these through holes.
[0048]
[Example 2]
Another embodiment will be described below with reference to FIG.
[0049]
In this embodiment, centrifugal blades 800 and 801 are respectively formed at regular intervals in the circumferential direction on both surfaces of the disk portion 53 of the rotor frame 5. The centrifugal blade 800 promotes air feeding into the air suction hole 602, and the centrifugal blade 801 improves the radial velocity of the air flow in the gap g. As a result, cooling of the rotor 3 and the stator 2 by air in the gap g is promoted.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view in the axial direction of a power train using a vehicular rotating electrical machine according to a first embodiment in the vicinity of the rotating electrical machine for a vehicle.
2 is a partial sectional view in the enlarged axial direction in the vicinity of a stator of the vehicular rotating electrical machine shown in FIG. 1; FIG.
3 is a radially enlarged cross-sectional view of a stator core of the vehicular rotating electrical machine shown in FIG.
4 is a partial development view of a stator of the rotating electrical machine for a vehicle shown in FIG. 1. FIG.
FIG. 5 is an enlarged axial side view of the vicinity of a rotor frame of the vehicular rotating electrical machine shown in FIG. 1;
6 is a partial cross-sectional view in the axial direction of a rotating electrical machine for a vehicle according to Embodiment 2. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotating electric machine for vehicles 2 Stator 3 Outer rotor part (rotor)
4 Inner rotor (rotor)
5 Rotor Support Frame 6 Stator Support Frame 7 Rod Support Member 100 Housing

Claims (3)

A rotor having a rotor core fixed to a rotating shaft; a stator core having a peripheral surface facing the peripheral surface of the rotor; and a stator winding wound around the stator core. In a vehicular rotating electrical machine comprising a stator fixed to a housing,
The rotor includes an outer rotor portion whose inner peripheral surface is electromagnetically coupled to the outer peripheral surface of the stator, an inner rotor portion whose outer peripheral surface is electromagnetically coupled to the inner peripheral surface of the stator, and an axial direction of the two rotor portions. A rotor frame that couples the outer rotor portion and the inner rotor portion to the rotating shaft on the non-housing side;
The stator core is fixed to the housing on the side opposite to the rotor frame,
The rotor frame communicates with a gap between the stator and the rotor frame and the outside to allow air to flow into the gap, and the stator is located on the outer side of the air suction hole. have a centrifugal impeller for urging the air sucked is formed on the end face of the core side through the air suction hole to the radially outer side,
The rotating electrical machine for a vehicle according to claim 1, wherein the rotor frame includes blades that are positioned on an inner side of the air suction hole and are formed on an end face on the side opposite to the stator core to feed cooling air into the air suction hole . A rotor having a rotor core fixed to a rotating shaft; a stator core having a peripheral surface facing the peripheral surface of the rotor; and a stator winding wound around the stator core. In a vehicular rotating electrical machine comprising a stator fixed to a housing,
The rotor includes an outer rotor portion whose inner peripheral surface is electromagnetically coupled to the outer peripheral surface of the stator, an inner rotor portion whose outer peripheral surface is electromagnetically coupled to the inner peripheral surface of the stator, and an axial direction of the two rotor portions. A rotor frame that couples the outer rotor portion and the inner rotor portion to the rotating shaft on the non-housing side;
The stator core is fixed to the housing on the side opposite to the rotor frame,
The rotor frame communicates with a gap between the stator and the rotor frame and the outside to allow air to flow into the gap, and the stator is located on the outer side of the air suction hole. have a centrifugal impeller for urging the air sucked is formed on the end face of the core side through the air suction hole to the radially outer side,
The rotor frame includes a centrifugal blade that is located on the inner surface of the air suction hole and is formed on an end surface on the side opposite to the stator core, and sends cooling air to the air suction hole. A rotating electrical machine for a vehicle , wherein internal air fed by a centrifugal blade is urged toward the gap . 3. The rotating electrical machine for a vehicle according to claim 1 , wherein the stator iron core includes a through hole that extends in an axial direction, and a heat transfer member that is inserted into the through hole and reaches the housing. A rotating electric machine for vehicles.

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