JP2001245447A - Rotary electric machine of stator-elasticity holding type - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine of a stator-elasticity holding type capable of preventing thermal degradation of an insulation membrane and an elastic member, and reducing a magnetic noise. SOLUTION: The temperature of a stator winding 31 is widely reduced in cooperation with a good heat-transport capacity to the axial direction of each conductor segment 33 having a large cross section in the axial direction, utilizing a stator winding of an U-shape sequential connection type as the stator winding 31, separately disposing each conductor segment 33 at a coil end of the stator winding 31 with each other one by one at an interval, and utilizing the interval as a ventilator for forced-cooling air by a cooling fan. Thus, the problem of thermal degradation of the elastic member 4, which has been caused in heat- dissipation deterioration of the stator iron-core 32 and the stator winding 31 difficult to solve in the electric machine of the stator-elasticity holding type that holds a stator 3 by a frame 4 through the elastic member 503, is improved to the level not problematic in actual use.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a low-noise rotating electric machine for a vehicle.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 5-502 filed by the present applicant
No. 17 proposes a rotating electric machine in which an elastic member is interposed between a stator core and a frame to reduce leakage of magnetic noise from the stator core to the outside (hereinafter, also referred to as a stator elastic supporting type rotating electric machine). ing. The elastic member has a structure in which rubber is interposed between a metal outer cylinder and an inner cylinder.

US Pat. No. 5,629,575 proposes a rotating electric machine in which a cushioning member is provided between a stator core and a frame to facilitate positioning of the stator core.

[0004] Japanese Patent Publication No. 292728 filed with the present applicant
No. 8 discloses that a plurality of U-shaped conductor segments are inserted into a pair of slots of a stator core, and a pair of tips of the conductor segments protruding from the slots are sequentially connected to form a stator winding (hereinafter referred to as U-shaped). There has been proposed a stator elastic support type rotating electric machine (hereinafter, also referred to as a U-shaped conductor sequential connection type stator elastic support type rotating electric machine) in which U-shaped conductor sequential connection type stator windings are formed.

[0005]

2. Description of the Related Art In recent years, while quietness of vehicles has been increasingly demanded and realized, magnetic noise of a rotating electrical machine for vehicles has become conspicuous, and its reduction has been demanded. Although the magnetic noise can be reduced by shielding the entire rotating electric machine with a soundproof case, it is impractical for a rotating electric machine for a vehicle due to problems such as mounting space, an increase in weight, and deterioration of cooling performance.

[0006] The above-described stator elastic support type rotating electric machine includes:
Although the above problem does not occur and it is preferable in terms of practical use, according to subsequent tests by the present inventors, in this stator elastic support type rotating electric machine, heat generated in the stator windings and the stator core is generated by the frame. The temperature of the stator winding rises because it is hard to be dissipated by heat transfer, and the insulation film and the elastic member (especially rubber) deteriorate due to thermal deterioration.
It was found that the effect of reducing the magnetic noise was reduced, and that practical application was difficult. Of course, it is possible to reduce the amount of heat generated by increasing the size of the stator windings and the stator core, but such an increase in the size and weight of the rotating electric machine is not realistic.
Although it is conceivable to reduce the temperature of the stator core, the stator windings, and the stator core by increasing the cooling air flow due to the increase in the fan air flow, this measure is not realistic because of the fan wind noise and the reduction in efficiency.

The use of silicon rubber or fluorine rubber having high heat resistance reduces the elasticity, so that the effect of absorbing vibration propagation and blocking magnetic noise from the stator core is reduced, and the manufacturing cost is considerably increased. This reduces market competitiveness.

After all, in the prior art, it has been difficult to reduce the magnetic noise of a rotating electric machine for a vehicle, which is required to be reduced in size and weight.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a stator elastic support type rotating electric machine which can reduce magnetic noise while preventing thermal deterioration of an insulating film and an elastic member of a winding. The purpose is.

[0010]

According to the first aspect of the present invention, a stator winding uses a U-shaped conductor sequential connection type stator winding as a stator winding, and the stator winding has a coil end. The conductor segments are arranged one by one with a gap therebetween, and these gaps are used as ventilation passages for forced cooling air by the cooling fan, so that each conductor segment having a large radial cross-sectional area is good in the axial direction. Combined with a high heat transfer capacity, the temperature of the stator winding can be significantly reduced,
As a result, the problem of heat deterioration of the elastic member due to deterioration of heat radiation of the stator core and the stator winding, which has conventionally been difficult to solve in the stator elastic support type rotating electric machine that supports the stator with the frame via the elastic member. Was improved to a level at which there was no practical problem.

According to a second aspect of the present invention, in the rotating electric machine of the first aspect, the elastic member is further in close contact with the entire outer peripheral surface of the stator core, so that the temperature of the stator is further reduced. And the stator can be stably supported.

According to a third aspect of the present invention, in the rotating electric machine of the first or second aspect, the elastic member is further formed by an elastic body integrally formed between the outer cylindrical portion and the inner cylindrical portion. With this configuration, the elastic member can be easily fitted to the stator core and the frame.

In particular, in the elastic member of the present structure, the temperature of the elastic member is heated and thermally expanded within a temperature range allowed by the elastic portion to be fitted to a cold stator core, and / or heated and thermally expanded. A so-called shrink fit, in which a cold elastic member is fitted into the frame, is possible, and a strong joining strength can be obtained between the elastic member and the frame or the stator core.

According to a fourth aspect of the present invention, in the stator elastically supported rotating electric machine of the first aspect, the frame further includes a front frame and a rear frame fastened in the axial direction with the stator core interposed therebetween. Since elastic members are interposed between the front and rear frames and the end faces of the stator core, respectively, the stator core can be firmly fixed to the frame, and the elastic members can be easily placed between the stator core and the frame. Can be interposed,
The fastening member (usually a through-hole) balances the magnetic noise attenuation effect of the elastic member with the vibration resistance of the stator core with respect to the frame.
It can be adjusted freely by tightening the bolts.

According to a fifth aspect of the present invention, in the rotating electric machine of the fourth aspect, the elastic members are fixed by a front elastic member and a rear elastic member which are annular members having an L-shaped cross section. Since the outer peripheral portion and the outer peripheral surface of the front end face and the rear end face of the core are supported, the stator core can be stably supported by the frame in both the axial direction and the radial direction.

Note that the L-shape referred to in the present specification is not limited to a member in which the angle between two sides (more precisely, two surfaces) is a right angle, but may be a substantially right angle, that is, a range of 75 to 105 degrees.

According to a sixth aspect of the present invention, in the rotating electric machine of the fourth aspect, the elastic members are a front elastic member and a rear elastic member which are annular members having an L-shaped cross section. The stator core is sandwiched between the stator core, the front frame and the rear frame in contact with the step surfaces provided on the outer peripheral portions of the front end face and the rear end face of the stator core. In both directions, the frame can be stably supported.

According to a seventh aspect of the present invention, in the rotating electric machine of the fifth or sixth aspect, the front elastic member and the rear elastic member each have an L-shaped axial cross-section. An inner cylindrical portion made of a metal ring in contact with the iron core;
The stator core is formed in an axial direction in a manner similar to claim 5 or 6, since the outer cylindrical portion is formed of a metal ring having a U-shaped axial cross section and in contact with the frame, and an elastic portion sandwiched between the two tubes. And the frame can be stably supported in both the radial direction, and furthermore, the elastic member can be shrink-fitted to the stator core or the frame as described above, and a strong joining force can be obtained. it can. Further, the outer peripheral portion of the stator core has a step due to the variation of the outer diameter and the lamination of each electromagnetic steel sheet, but the step does not damage the soft joint at the time of fitting.

According to an eighth aspect of the present invention, there is provided the rotary electric machine having the elastically supported stator according to the fourth aspect.
Since the front-side elastic member and the rear-side elastic member described above are divided into substantially arc-shaped members, the same effect as in claim 7 can be obtained.

According to the ninth aspect of the present invention, the stator elastically supported rotary electric machine according to any one of the fourth to eighth aspects further exposes an axially intermediate portion of the outer peripheral surface of the stator core. The exposed outer peripheral surface of the iron core can be satisfactorily cooled by cooling air or the like.

According to a tenth aspect of the present invention, in the stator elastically supported rotary electric machine according to any one of the fourth to eighth aspects, the rear end face of the front frame and the front end face of the rear frame further have a diameter of the stator core. Because it abuts on the outside,
The rigidity of the rotating electric machine can be improved, and the amount of axial interference of the elastic member can be strictly controlled.

According to the eleventh aspect of the present invention, in the rotating electric machine of the first aspect, the elastic member is further embedded in a plurality of grooves extending in the axial direction on the inner peripheral surface of the frame. Therefore, at the time of power generation, the elastic member thermally expands and projects toward the stator core side, that is, radially inward, so that the outer peripheral surface of the stator core can be elastically supported.

According to the twelfth aspect of the present invention, since the stator core is cooled by the cooling liquid, thermal degradation of the elastic member provided between the stator core and the frame is suppressed. By doing so, the effect of damping magnetic vibration from the stator core to the frame can be improved.

According to the thirteenth aspect of the present invention, the elastic member is further in contact with the coolant, so that thermal degradation of the elastic member is further suppressed. In addition, the effect of damping the magnetic vibration can be maintained. Further, the elastic member can also function as a coolant sealing material.

According to the construction of claim 14, claim 12 is
Further, in the stator elastic supporting type rotating electric machine according to item 13, the temperature of the stator winding, which is a heat source, can be remarkably reduced, so that the thermal deterioration of the elastic member can be further suppressed in combination with the cooling by the cooling liquid. Can be.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the rotating electric machine of the present invention will be described with reference to the following embodiments.

[0027]

Embodiment 1 Hereinafter, an embodiment of a vehicle alternator to which the present invention is applied will be described with reference to the drawings. (Overall Structure) FIG. 1 shows the overall configuration of an automotive alternator used in this embodiment. The vehicle alternator 1 includes a rotor 2, a stator 3, a frame 4, a rectifier 5, and the like.

The rotor 2 has a field winding 8 formed by winding an insulated copper wire cylindrically and concentrically, and is fitted on a shaft 6 having six claw portions, respectively. It has a pair of pole cores 7 fixed, and the field winding 8 is
Are provided in the axial direction. A cooling fan 11 is attached to the end face of the pole core 7 on the front side by welding or the like in order to radially discharge the cooling air sucked from the front side. Similarly, the pole core 7 on the rear side
A cooling fan 12 is attached to an end face of the cooling fan 12 by welding or the like in order to discharge cooling air sucked from a rear side in a radial direction. The outer peripheral surface of the pole core 7 faces an inner peripheral surface of a stator core 32 described later via a predetermined gap.

The stator 3 has a stator winding 31 and a stator core 32, and the stator winding 31 is fixed by an insulator 34 made of a resin for electrical insulation inserted into a slot of the stator core 32. The core 32 is electrically insulated. The stator winding 31 is composed of three phase windings connected in a three-phase star connection, and each phase winding is configured by sequentially connecting a large number of conductor segments 33 in series as described later. The conductor segment 33 is mainly composed of two types of U-shaped conductor segments 38 and 39 as described later. 36,
Reference numeral 37 denotes a coil end of the stator winding 31 protruding from both end surfaces of the stator core 32.

The peripheral wall of the frame 4 supports a stator core 32, and the peripheral wall of the frame 4 faces the coil ends 36 and 37 of the stator winding 31 to discharge cooling air. A discharge window 42 is opened, and a suction window 41 for sucking cooling air is provided on an end wall of the frame 4.

The outer peripheral surface of the stator 2 is fixed to the inner peripheral surface of the frame 4 via an elastic member 50. In this embodiment, the elastic member 50 is attached to the outer peripheral surface of the stator core 32, and after the frame 4 is sufficiently thermally expanded, the stator 2 with the elastic member 50 is inserted, whereby the elastic member 50 is attached. Stator 2 is assembled to frame 4. (Operation) When a rotational force is transmitted from an engine (not shown) to a pulley 20 provided on the shaft 6 via a belt or the like, the rotor 3 rotates in a predetermined direction. In this state, if a claw portion of the pole core 7 is excited by applying an excitation voltage to the field winding 8 of the rotor 3 from the outside, a three-phase AC voltage can be generated in the stator winding 31. A predetermined DC current is output from the output terminal of the rectifier 5. (Description of Stator Winding 31) FIG. 3 is a schematic perspective view of a conductor segment 33, in which a radial cross section of the stator 3 is shown in FIG.

The stator core 32 has a number of slots S for accommodating a multi-phase stator winding. Reference numeral 34 denotes an insulator for electrically insulating the stator core 32 and the stator winding 31 in the slot S. In this embodiment,
36 slots S are formed at equal intervals to accommodate three-phase stator windings corresponding to the number of magnetic poles of the rotor 2. Each slot S is provided with an even number (four in this embodiment) of slot conductor accommodation positions C1, C2, C3, and C4 in order from the inside to the outside.

As described above, the stator winding 31 formed by connecting the conductor segments 33 has a linear slot conductor portion 35 accommodated in the slot S, a slot conductor outside the slot from the slot conductor portion 35, and a rear side. A first coil end (also referred to as a curved portion side coil end) 36 and a second coil end projecting from the slot conductor portion 35 to the front outside the slot.
And a coil end (also referred to as a projecting portion side coil end) 37.

The conductor segment 33 includes a large number of large-circular U-shaped conductor segments 38 and small small-sized U-shaped conductor segments 39 each of which is a U-shaped rectangular wire, and an I-shaped rectangular wire. Are also used for lead wires or for connecting a neutral point.

The large round U-shaped conductor segment 38 is
As shown in FIG. 3, the first coil end 36 includes a substantially U-shaped head 380, and a pair of legs 381 and 382 extending from both ends of the head 380. The head 380 has a predetermined circumferential span at the joint with the legs 381 and 382.

The leg 381 includes a slot conductor 3811 accommodated in the slot conductor insertion position C1 of the slot S,
The second projecting from the slot conductor 3811 to the front side
And a distal end protruding portion 3812 that constitutes the coil end 37. The distal end protruding portion 3812 has a joining portion 38
13.

The leg 382 includes a slot conductor 3821 accommodated in the slot conductor insertion position C4 of the slot S,
The second projecting from the slot conductor 3821 to the front side
A distal end side projection 3822 constituting the coil end 37 is formed.
23.

The proximal end (slot conductor portion side) and the distal end of the distal end protruding portion 3812 and the proximal end (slot conductor portion side) and the distal end of the distal end protruding portion 3822 extend in the circumferential direction of the head 380 in the circumferential direction. About half the distance away.

The small-turn U-shaped conductor segment 39 is
As shown in FIG. 3, the first coil end 36 includes a substantially U-shaped head 390 and a pair of legs 391 and 392 extending from both ends of the head 390. The head 390 has a predetermined circumferential span at its joint with the legs 391 and 392.

The leg portion 391 has a slot conductor portion 3911 accommodated in the slot conductor insertion position C2 of the slot S,
The second projecting from the slot conductor portion 3911 to the front side.
And a distal end protruding portion 3912 which constitutes the coil end 37.
13.

The leg portion 392 has a slot conductor portion 3921 accommodated in the slot conductor insertion position C3 of the slot S,
The second projecting from the slot conductor portion 3921 to the front side.
And a distal end protruding portion 3922 which constitutes the coil end 37.
23.

The proximal end (slot conductor portion side) and the distal end of the distal protrusion 3912 and the proximal end (slot conductor portion side) and the distal end of 3922 are about half of the circumferential span of the head 390 in the circumferential direction. Separated by a distance.

The same large round U-shaped conductor segment 38
The pair of leg portions 381, 382, more specifically, their slot conductor portions 3811, 3821 are separately accommodated in different slots S separated by a predetermined magnetic pole pitch. A pair of legs 391, 392 of the small-turn U-shaped conductor segment 39, more specifically, their slot conductors 3911, 3921 are separately accommodated in different slots S separated by a predetermined magnetic pole pitch.

As described above, the slot conductor 381 of the leg 381 of the large U-shaped conductor segment 38 is used.
1 is accommodated in the slot conductor insertion position C1 at the shallowest of the slots S, and the slot conductor portion 3821 of the leg portion 382 of the U-shaped conductor segment 38 is accommodated at the deepest slot conductor insertion position C4.

Similarly, the slot conductor portion 3911 of the leg portion 391 of the small-turn U-shaped conductor segment 39 is accommodated in the slot conductor insertion position C2 of the second shallow slot S, and the small-turn U-shaped conductor segment 39 is inserted. Legs 392
Is accommodated in the third shallow slot conductor insertion position C3.

Thus, the rear first coil end 3
6, the head 380 of the large-circle U-shaped conductor segment 38 can be arranged to wrap around the head 390 of the small-circle U-shaped conductor segment 39, and the two heads 380, 390
Are prevented from intersecting and interfering with each other.

More specifically, in the first coil end 36 on the rear side, the head 380 is attached to the slot conductor 3811 of the leg 381 inserted into the slot conductor insertion position C1.
And a leg 382 inserted into the slot conductor insertion position C4.
With the slot conductor portion 3821 of FIG. Head 3
90 is a leg 3 inserted at the slot conductor insertion position C2.
91 and the slot conductor portion 392 of the leg portion 392 inserted into the slot conductor insertion position C3.
1 is connected.

The second coil end 37 on the front side
At the tip, the tip-side protrusion 3812 of the leg 381 of the U-shaped conductor segment 38 at the C1 position is
U-shaped conductor segment 39 at C2 position radially adjacent
Of the leg portion 391 is joined to the tip-side protruding portion 3912 of the leg portion 391. Similarly, the legs 38 of the U-shaped conductor segment 38 at the C4 position
The two distal end projections 3822 are joined at their distal ends to the distal end projections 3922 of the legs 392 of the U-shaped conductor segment 39 at the C3 position adjacent in the radial direction.

That is, the slot conductor 3811 of the leg 381 inserted into the slot conductor insertion position C1 is connected to the slot conductor of the leg 391 inserted into the slot conductor insertion position C2 at the second coil end 37 on the front side. 3911. In addition, slot conductor insertion position C
4 slot conductor 3821 of leg 382 inserted into
Is connected to the slot conductor 3921 of the leg 392 inserted into the slot conductor insertion position C3 at the second coil end 37 on the front side. Thereby, each phase winding of the three-phase stator winding 31 is formed. FIG. 4 shows a part of the second coil end 37 on the front side.

However, the slot conductors and the part of the slot conductors constituting the lead wires of the stator winding 31 are formed in shapes different from the U-shaped conductor segments 38 and 39. That is, the first coil end 36 on the rear side has a specially shaped U-shaped conductor segment connecting the slot conductor portions at the slot conductor insertion positions C1 and C4 and the slot conductor portions at the slot conductor insertion positions C2 and C3. Provided.

Since the structure itself and the wiring form of this type of U-shaped conductor segment sequential connection type stator coil are the same as those of the above-mentioned prior art, further description is omitted. Since there are various methods, it is naturally possible to give various variations to the connection of the stator coil of the U-shaped conductor segment sequential connection type. Thus, the stator winding 31 is formed. (Cooling of Stator Winding 31) In this embodiment, the stator winding 31 is cooled mainly by air cooling its coil ends 36 and 37.

More specifically, the coil ends 36, 37
3, the conductor segments 33 are arranged with a predetermined gap therebetween, that is, a cooling air passage, as shown in FIGS. 3 and 4, and the cooling air blown radially outward from the cooling fans 11 and 12 passes through this gap. Is discharged to the outside of the diameter.

That is, both coil ends 36 of the stator winding 31 having the U-shaped conductor sequential connection structure referred to in the present invention,
At 37, the cooling air uniformly and without leakage contacts the surfaces of all the conductor segments 33 constituting them, and takes heat away.

Since the cross-sectional area of the conductor segment 33 is much larger than that of the round conductor of the conventional wound stator coil, undesired deformation does not occur when the stator winding 31 is assembled. In addition, the cooling air passage is not closed or narrowed, and the coil ends 36 and 37 are not locally heated.

Further, since the cross-sectional area of the conductor segment 33 is large, heat generated in the slot conductor portion, that is, the slot accommodating portion of the conductor segment 33 is transferred to the conductor segment 33 in the extending direction thereof, and the coil ends 36 and 37 are favorably formed. , The electric resistance of the winding itself is reduced, so that the amount of heat generated can be reduced. Therefore, the slot conductor of the conductor segment 33 does not overheat. As a result, the temperature of the stator winding 31 can be kept lower than that of the stator core 32. (Reduction of Magnetic Noise) In this embodiment, the stator core 32
Is elastically supported by the frame 4 through the elastic member 50 as shown in FIG.

The elastic member 50 has a heat-resistant rubber cylindrical shape,
The magnetic noise generated in the stator core 32 and transmitted to the frame 4 is attenuated.

In this embodiment, the heat generated in the stator winding 31 and the stator core 32 of the U-shaped conductor sequential connection type is cooled by the cooling wind directly contacting the coil ends 36 and 37 of the stator winding 31. Heat is dissipated. The stator winding 31 of the U-shaped conductor sequential connection type has a large number of rectangular wires having a large cross-sectional area arranged with a gap (cooling air passage) having substantially equal circumferential widths between the coil ends 36 and 37. It is composed of conductor segments 33.

Therefore, the stator winding 31 of the U-shaped conductor sequential connection type has a round cross section and is wound around the stator core 32 one turn at a time. The cooling capacity of the coil ends 36 and 37 is remarkably high. Also, the coil ends 36 and 37 are separated from the slot conductors.
And the temperature difference between the coil ends 36 and 37 and the slot conductor is also small.

As a result, the temperature rise of the stator core 32 and the stator core 32 adjacent to the stator core 32 can be remarkably reduced as compared with a conventional rotary electric machine having a wound stator coil. As a result, the elasticity for attenuating the magnetic noise can be reduced. The thermal deterioration of the member 50 can be reduced to a usable range, and for the first time, it is possible to interpose the elastic member 50 mainly composed of rubber between the frame of the rotating electric machine and the stator core 32. At this time, the thickness of the elastic member 50 can be increased to further increase the effect of absorbing vibration propagation. Further, the elastic member 50
It is possible to use much cheaper nitrile rubber or acrylic rubber without using expensive heat-resistant rubber such as silicon rubber or fluoro rubber as natural rubber.Natural rubber can also be used especially when the vehicle temperature condition is mild Thus, it is possible to solve the problem of reducing magnetic noise while favorably suppressing an increase in cost. (Modification 1) In the above embodiment, the elastic member 50 has a cylindrical shape covering the entire outer peripheral surface of the stator core 32. However, a part of the outer peripheral surface of the stator core 32 is formed as an annular member or a plurality of protrusions. Frame 4 without contacting with gap 50
Can be opposed to the inner peripheral surface.

Further, a cooling window can be provided in the frame 4 facing the gap. (Modification 2) In this modification, as shown in FIGS. 5 and 6, instead of the elastic member 50 of the first embodiment, a pair of elastic members An opening 43 is provided between the outer peripheral surface of the stator core 32 and the peripheral wall of the frame 4.

Reference numeral 44 denotes this opening and the front outlet 4
2, a peripheral wall portion 45 of the frame 4 extending in the circumferential direction and located between the opening and the discharge port 42 on the rear side. It is a peripheral wall. These peripheral wall portions 44 and 45 have an L-shaped axial cross section.

The two elastic members 501 are made of rubber rings having an L-shaped axial cross section, and are interposed between the outer peripheral portions of both ends of the stator core 32 and the two peripheral wall portions 44 and 45.

The elastic member 501 on the front side has two sides extending radially inward and rearward, and is in close contact with the outer peripheral surface of the stator core 32 and the outer peripheral portion of the front end surface. The rear end opening edge is in close contact with two surfaces extending radially inward and rearward of the step. The elastic member 501 on the rear side has two sides extending radially inward and forward, and the stator core 32
Of the frame 4 and the outer peripheral surface of the rear end face.
The peripheral wall portion 44 is in close contact with two surfaces extending radially inward and forward of the step at the opening edge of the front end. The two elastic members 501
May be arranged in the same shape in the opposite axial direction.

In this way, the elastic member 501 can attenuate both the axial vibration and the radial vibration of the stator core 32 transmitted to the frame 4, and the stator core 32 32 can be cooled well.

In this embodiment, the peripheral wall portion 44 is preferably provided at the rear end of the front frame, and the peripheral wall portion 45 is preferably provided at the front end of the rear frame. In this case, the front frame and the rear frame are fastened with through bolts. By doing so, the stator core 32 can be sandwiched. (Modification 3) As shown in FIGS. 7 and 8, this modification employs an elastic member 50 instead of the elastic member 501 of Modification 2.
2 is different.

The elastic member 502 is formed by unifying metal rings 502a and 502b having L-shaped axial cross sections on both sides of an elastic portion 502c having the same shape as the elastic member 501 of the second modification.

In this embodiment, since the rubber elastic portion 502c sandwiched and integrally joined between the metal rings 502a and 502b is employed as the elastic member, it is possible to reduce the variation in the posture and position of the stator core 32. Thereby, the eccentricity with the rotor 2 is prevented, and the air gap between the inner peripheral surface of the stator core 32 and the outer peripheral surface of the rotor 2 is made uniform, thereby preventing imbalance of magnetic pulsation. Magnetic noise can be further reduced. (Modification 4) This modification uses the elastic member 502 of Modification 3 as shown in FIG.
And a flat cooling tube tube 8 is interposed between the frame 4 and the stator core 32.

More specifically, the frame 4 includes a stepped rear edge of the front frame 4a and a rear frame 4a.
b and the front edge of the stepped front end. The peripheral wall portion 44 'of the front frame 4a is provided with the front-side discharge port 4.
2 and is in close contact with the metal ring 502a on the outer peripheral side of the elastic member 502 on the front side. Similarly, the peripheral wall portion 45 ′ of the rear frame 4 b is located immediately before the discharge port 42 on the rear side and is in close contact with the metal ring 502 a on the outer peripheral side of the elastic member 502 on the rear side.

The flat cooling tube tube 101 contains water 1 inside.
00 is made of a thin aluminum tube that is hermetically sealed, and the stator core 3
2 and the inner peripheral surfaces of the peripheral wall portions 44 'and 45' are in close contact with each other to transfer heat between them. Alternatively, water is allowed to flow in the flat cooling tube tube 101 to cool the stator core 32.

In this way, the temperature of the stator core 32 can be further reduced, and the thermal deterioration of the elastic member 502c can be prevented. (Modification 5) As shown in FIGS. 10 and 11, this modification corresponds to the elastic member 502 of Modification 3 shown in FIGS.
Are changed to elastic members 503 having different shapes, and the shape of the stator core 32 is changed.

More specifically, the peripheral wall portion 44 of the front frame 4a is located immediately after the front discharge port 42 and is provided on the outer peripheral metal ring 50 of the front elastic member 503.
Step portion 100 in close contact with the inner surface 3a and the rear end surface 3a
With. Similarly, the peripheral wall portion 45 of the rear frame 4b is located immediately before the discharge port 42 on the rear side, and the elastic member 50 on the rear side
3 has a stepped portion which is in close contact with the metal ring 503a on the outer peripheral side on the inner peripheral surface and the front end surface.

The elastic member 503 on the front side has two sides extending radially outward and forward, is in close contact with a step provided on the outer periphery of the front end portion of the stator core 32, and furthermore, is formed on the peripheral wall portion 44 of the front frame 4 a. It is in close contact with the two steps extending radially and rearward of the step at the rear end opening edge. The elastic member 503 on the rear side has two sides extending radially outward and rearward, is in close contact with a step provided on the outer periphery of the rear end portion of the stator core 32, and further has a front end of the peripheral wall portion 44 of the frame 4. The opening edge is in close contact with two surfaces extending radially and forward of the step. The two elastic members 503 may have the same shape and are arranged in opposite axial directions.

In this manner, accurate positioning of the stator core 32, reduction of magnetic noise, and securing of cooling performance of the stator core 32 can be realized. (Modification 6) As shown in FIG.
This embodiment differs from the first embodiment in that the elastic member 50 of the first embodiment shown in FIG. 1 is changed to a cylindrical elastic member 504.

The elastic member 504 is sandwiched between metal rings 504a and 504b having an L-shaped cross section and employs an elastic portion 504c composed of a rubber ring integrally joined. Can be reduced. (Modification 7) In this modification, the elastic portion 504c of the elastic member 504 shown in FIG. 12 is a rubber body mixed with a material having better heat conductivity than rubber, such as powder of aluminum or short fiber. .

In this manner, the radial heat transfer resistance of the elastic member 504c can be reduced, and
The magnetic noise can be reduced while suppressing the thermal deterioration of 4c. (Modification 8) As shown in FIG.
As the elastic member, an annular elastic member 50 shown in FIGS.
2 is an arc-shaped elastic piece 5 having a shape divided at a predetermined angle.
05b is replaced by an elastic member 505 having a plurality of shapes arranged at a certain interval in the circumferential direction.

The elastic member 505 has the same effect as the elastic member 502, and the gap between the two adjacent arc-shaped elastic pieces 505a can be used as a cooling air passage, so that a further stator cooling effect can be obtained. it can.

Similarly, an elastic member can be formed by arranging a required number of arcuate elastic pieces each having a shape obtained by dividing each elastic member described above in the circumferential direction in the circumferential direction. (Modification 9) As shown in FIG.
In FIG. 1, a plurality of grooves 401 are provided in the inner peripheral surface of the frame 4 surrounding the outer peripheral surface of the stator core 32 in the axial direction, and the elastic members 504 are embedded in these grooves 401.

In FIG. 14, the radial section of the groove 401 is formed in a substantially semicircular shape, and the elastic member 5 which is exposed inward of the radial direction is formed.
The exposed surface 04 forms the inner peripheral surface of the frame 4 together with the inner peripheral surface portion other than the groove 401 of the frame 4.
The elastic member may be slightly projected from the inner peripheral surface of the system 4.

In this way, when power is generated, the elastic member 5
Since 04 expands thermally and projects toward the stator core 32, that is, radially inward, the outer peripheral surface of the stator core 32 can be elastically supported by these elastic members 504 arranged at a predetermined pitch in the circumferential direction. (Modification 10) This modification has a structure in which the cooling water 100 flows near the outer side of the elastic member 50 as shown in FIG. In this case, the cooling of the stator core 32 by the cooling water can improve the thermal deterioration of the elastic member 50 and reduce the magnetic vibration. Furthermore, since the stator winding is formed of a conductor segment having a large radial cross-sectional area, the heat generation itself can be significantly reduced, so that the thermal deterioration of the elastic member 50 can be more effectively suppressed.

The elastic member 50 attenuates magnetic vibration from the stator core 32 and also functions as a sealant for the cooling water 100.

In this embodiment, instead of an open type using an air-cooling fan, a closed type can be used by using the closed frames 4000 and 4001, so that the rigidity of the frame can be improved and the magnetic noise can be further reduced. . (Other Aspects) In the elastic member formed integrally with the metal ring described in each of the above aspects, the metal ring that comes into contact with the outer peripheral surface of the stator core 32 is fitted to the stator core 32. Thus, it is only necessary to assemble the elastic member previously integrated with the stator core 32 into the frame 4, and the assembling operation can be facilitated without impairing the assembling accuracy and the magnetic noise reduction effect.

[Brief description of the drawings]

FIG. 1 is an axial cross-sectional view showing one embodiment of a stator elastic supporting type rotating electric machine of the present invention.

FIG. 2 is a partial radial sectional view of the stator shown in FIG.

FIG. 3 is a perspective view showing a part of the stator winding shown in FIGS. 1 and 2;

FIG. 4 is a perspective view showing a front coil end of the stator winding shown in FIG. 1;

FIG. 5 is a partial axial sectional view showing a modified embodiment of the stator elastically supported rotating electric machine of the present invention.

FIG. 6 is a partial perspective view of the elastic member shown in FIG.

FIG. 7 is a partial axial cross-sectional view showing another modification of the stator elastic support type rotating electric machine of the present invention.

8 is a partial perspective view of the elastic member shown in FIG.

FIG. 9 is a partial axial sectional view showing another modification of the stator elastic support type rotating electric machine of the present invention.

FIG. 10 is a partial axial sectional view showing another modification of the stator elastic support type rotating electric machine of the present invention.

11 is a partial perspective view of the elastic member shown in FIG.

FIG. 12 is a partial axial cross-sectional view showing another modification of the stator elastic support type rotating electric machine of the present invention.

FIG. 13 is a partial axial cross-sectional view showing another modification of the stator elastic support type rotating electric machine of the present invention.

FIG. 14 is a partial axial sectional view showing another modification of the stator elastic support type rotating electric machine of the present invention.

FIG. 15 is a partial axial sectional view showing another modification of the stator elastic supporting type rotating electric machine of the present invention.

[Explanation of symbols]

 2: Rotor 3: Stator 4: Frame 11, 12: Cooling fan 31: Stator winding 32: Stator core 33: Conductor segment 36, 37: Coil end 50: Elastic member S: Slot 502: Elastic member ( (A front elastic member, a rear elastic member) 502a: outer cylindrical portion 502b: elastic portion 502c: inner cylindrical portion S: 44 ': front frame 45': rear frame 100: step portion (step)

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (Reference) H02K 19/22 H02K 19/22 (72) Inventor Shigenobu Nakamura 1-1-1, Showa-cho, Kariya-shi, Aichi Pref. F-term (Reference) 5H002 AA08 AB04 AB06 AC01 AC06 AC08 AD02 AE08 5H603 AA03 AA12 BB02 BB07 BB09 BB12 CA01 CA05 CB03 CB11 CC05 CC13 CC17 CD02 CD06 CD22 CD24 EE01 EE03 EE11 5H605 AA01 AA04 BB01 DD03 CC01 DD03 CC01 DD03 GG04 5H609 BB05 PP02 PP06 PP09 QQ02 QQ04 QQ10 QQ11 RR06 RR08 RR10 RR11 RR16 RR27 RR37 RR43 RR58 RR67 RR69 5H619 AA10 AA11 BB02 BB06 BB17 BB22 PP01 PP06 PP14 PP25

Claims (14)

[Claims] 1. A frame, a stator core fixed to the frame, a stator winding inserted into a slot of the stator core, a rotor rotating while facing the stator core, A stator elastic support type rotating electric machine comprising: a cooling fan that blows air toward a coil end of a stator winding; an elastic member interposed between the stator core and the frame; The wire is formed by inserting a pair of legs of a large number of conductor segments having a U-shape from one end side of the stator core into the slot, and projecting the tip end of the conductor segment protruding to the other end side of the stator core. Each of the conductor segments is arranged so as to be separated from each other one by one through a predetermined gap forming a ventilation path of the cooling fan at the coil end. Data elastic support rotating electric machine. 2. The rotating electric machine according to claim 1, wherein the elastic member has an outer peripheral surface in close contact with an inner peripheral surface of the frame, and an inner peripheral surface in close contact with the entire outer peripheral surface of the stator core. A rotating electric machine with elastically supported stators. 3. The electric rotating machine according to claim 1, wherein the elastic member is integrally formed with the two cylindrical portions between a metal outer cylindrical portion and an inner cylindrical portion arranged concentrically. An electric rotating machine of a stator elastic support type, comprising: an elastic portion formed of an elastic body. 4. The stator elastically supported rotary electric machine according to claim 1, wherein the frames are axially fastened to each other while being in contact with outer peripheral portions of both end surfaces of the stator core with the elastic members interposed therebetween. A resilient stator-type rotating electric machine comprising a frame and a rear frame. 5. The rotary electric machine according to claim 4, wherein the elastic member has an L-shaped axial cross section, and is provided near an outer peripheral edge of a front end face and a rear end face of the stator core. A stator elastic support type rotating electric machine comprising: an annular front elastic member and a rear elastic member interposed between an end surface and an outer peripheral surface of a stator core and an end surface and an inner peripheral surface of the front frame. 6. An electric rotating machine according to claim 4, wherein an outer peripheral portion of said stator core end face has an annular step, and said elastic member has an L-shaped axial cross section. An annular front elastic member and a rear elastic member interposed between the step of the stator core and end surfaces and inner peripheral surfaces of the front frame and the rear frame. Electric machine. 7. The stator elastic support type rotating electric machine according to claim 5, wherein the front elastic member and the rear elastic member have the L-shaped axial cross section and have a front end face of the stator core. An elastic portion comprising an annular elastic body interposed between an end surface and an outer peripheral surface of the stator core and an end surface and an inner peripheral surface of the rear frame near an outer peripheral edge of a rear end surface; and An inner cylindrical portion comprising a metal ring sandwiched between the stator core and both the end surface and the outer peripheral surface of the stator core, and sandwiched between the elastic portion and the front frame or the rear frame. An outer cylinder portion made of a metal ring in contact with both the end surface and the inner peripheral surface of the front frame and the rear frame, wherein the elastic portion, the inner cylinder portion, and the outer cylinder portion are integrally formed. Stator elastic support type Rolling electric. 8. The rotating electric machine according to claim 4, wherein the elastic member has an L-shaped axial cross section and is provided near an outer peripheral edge of a front end face and a rear end face of the stator core. A front elastic member and a rear elastic member interposed between two surfaces or steps of an end surface and an outer peripheral surface of a stator core and an end surface and an inner peripheral surface of the front frame; the front elastic member and the rear side; The stator elastically supported rotary electric machine, wherein the elastic member includes a plurality of unit elastic members each having a substantially arc shape and arranged at a predetermined interval in a circumferential direction. 9. The stator elastic support type rotating electric machine according to claim 4, wherein an axially intermediate portion of an outer peripheral surface of the stator core is exposed. Rotating electric machine. 10. The stator elastically supported rotary electric machine according to claim 4, wherein a rear end face of the front frame and a front end face of the rear frame abut on a radially outer side of the stator core. A rotating electric machine with elastically supported stators. 11. The rotating electric machine according to claim 1, wherein the inner peripheral surface of the frame has a plurality of grooves extending in an axial direction at a portion facing the stator core. The stator elastically supported rotary electric machine, wherein the elastic member is embedded in the front groove to form a part of the inner peripheral surface of the frame. 12. A frame, a stator core fixed to the frame, a stator winding inserted into a slot of the stator core, and a cooling liquid formed in the frame and near the stator core. An electric rotating machine comprising: a cooling liquid passage through which a stator flows; and a resilient member interposed between the stator core and the frame. 13. An electric rotating machine according to claim 12, wherein said elastic member has a portion in contact with said cooling liquid. 14. The stator elastic supporting type rotating electric machine according to claim 12, wherein the stator winding is configured such that a pair of legs of a large number of conductor segments having a U-shape are arranged from one end of the stator core. The coil ends are formed by joining a pair of the end portions of the conductor segments that are inserted into the slots and protrude to the other end side of the stator core, one by one at the coil ends. A resilient stator supporting rotating electric machine, which is arranged apart from each other.