JPH1141861A - Electric rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric rotating machine which is superior in lubricating property, cooling property, and sealing property. SOLUTION: A refrigerant containing oil is blown out to the rotor accommodation space within a housing through holes 301-303 of a rotary shaft 202 from an external cooling fluid supplier. In particular in this constitution, a refrigerant containing oil is blown out between the bearings 201 and 201 for bearing a rotor 10 and the sealing members 210 and 111 on its outside, and the blown-out refrigerant which contains oil is led into the rotor accommodation space through the bearings 201 and 203 and is returned again to the cooling fluid supplier from the rotor accommodation space. In this way, an electric rotating machine superior in cooling property and lubricating property can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine of a single rotor type or a double rotor type.

[0002]

2. Description of the Related Art Japanese Patent Application No. 3-508783 discloses a single-rotor motor in which a gas-liquid two-phase refrigerant is circulated in an internal space of a housing in which a stator and a rotor are stored. In the same publication, a refrigerant outlet / injection system through a peripheral wall portion through an inlet and a return port provided in the peripheral wall portion to allow an external refrigerant to enter and exit a rotor accommodating space in a stator, and a stationary shaft are provided. It discloses a refrigerant flow through a fixed shaft that does so through an inlet and a return.

Further, Japanese Patent Application No. 9-56010 and Japanese Patent Application No.
Japanese Patent No. 3509 discloses a rotating electric machine of a double rotor type that transmits and receives torque electromagnetically to an inner inner rotor, an outer stator, and the like.

[0004]

However, the above-mentioned rotary electric machine of the double rotor type has a structure in which an inner rotor having a rotor coil is surrounded by an outer rotor, and a stator is provided on the outer peripheral side. As a result, the structure of both rotors and the bearing structure become complicated, and the outer outer bearing in particular has a large diameter, which causes a problem of increased frictional heat generation. This is because the peripheral speed of the outer peripheral surface of the outer rotating shaft increases in principle. In other words, in this type of double-rotor type rotating electric machine, although the structure is complicated in principle, the flow of the cooling fluid is deteriorated and the cooling tends to be insufficient, but the cooling of the bearing part The necessity contained a contradiction that it would rather increase.

In view of the above, it is conceivable to provide a large cooling effect with a small cooling fluid flow rate by using the latent heat cooling (boiling cooling) by circulating the above-described gas-liquid two-phase refrigerant in the rotating electric machine of the double rotor type. . However, in order to adopt such cooling by the gas-liquid two-phase refrigerant, the rotor accommodating space must be hermetically sealed by a sealing member. Since the peripheral speed of the shaft increases, there is a problem that the wear of the outer seal member for sealing the outer periphery of the outer rotating shaft increases.

Accordingly, it is conceivable to lubricate these bearings and seal members by mixing oil into a cooling fluid composed of a gas-liquid two-phase refrigerant. In the through-portion refrigerant inflow / outflow method, there is a problem that the rate of adhering to the inner wall surface of the housing, the surface of the stator, the surface of the stator coil, and the like and flowing down is large, and the lubrication of the end bearing and the seal member is small. Also, in the above-described fixed shaft refrigerant inflow and outflow system, the oil blown into the housing is blown off to the inner peripheral surface of the housing by the centrifugal force, and as a result, it is difficult to return to the return port of the rotating shaft again, There has been a problem that it stays at the bottom of the housing.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its first object to provide a rotating electric machine having excellent cooling and lubricating properties. A second object of the present invention is to provide a rotating electric machine of a double rotor type in which cooling performance is improved while satisfactorily suppressing wear.

[0008]

According to the rotating electric machine of the present invention, the oil-containing refrigerant is blown from the external cooling fluid supply unit to the rotor accommodating space in the housing through the hole of the rotating shaft. In particular, in this configuration, the oil-containing refrigerant is blown out between the bearing supporting the rotor and the seal member outside the bearing, and the blown-out oil-containing refrigerant is introduced into the rotor housing space through the bearing. -Return to the cooling fluid supply section again from the storage space.

With this configuration, it is possible to realize a rotating electric machine having excellent cooling and lubricating properties. More specifically, after the oil-containing refrigerant is introduced into the housing through the rotation shaft, the oil-containing refrigerant is injected from a spout port opened between the bearing and the seal member for hermetically sealing the inside of the housing provided outside in the axial direction of the bearing. It is blown out inside the housing. Therefore, the oil initially richly contained in the oil-containing refrigerant first comes into contact with the bearing and the seal member first, and the oil can be favorably lubricated. Further, since the oil-containing refrigerant is thereafter introduced into the rotor housing space axially inside the bearing through the bearing, the bearing is well lubricated by the oil still sufficiently contained in the oil-containing refrigerant. Further, the oil-containing refrigerant sufficiently cools these bearings and seal members, and thereafter, the refrigerant having a slightly reduced oil content cools the rotor and the stator in the rotor accommodating space.

According to the second aspect of the present invention, the first aspect is provided.
The described cooling technology of the refrigerant flow through the rotating shaft was applied to a rotating electric machine of a double rotor type. To be more specific, the oil-containing refrigerant blown out from the inner rotation shaft to between the inner bearing and the seal member is blown out between the outer bearing and the seal member through the through hole of the outer rotation shaft, and further, It is blown into the rotor housing space through the outer bearing.

According to this structure, in addition to the effect of the first aspect, the outer bearing and the seal member can be further lubricated and cooled by the refrigerant rich in the oil component blown out from the outer rotating shaft. Can be. Especially,
Since the inner diameter of the outer bearing and the seal member is large and the area is large, this effect is large. Oil adhering to the outer peripheral surfaces of the outer bearing and the inner bearing also improves the sealing effect.

According to a third aspect of the present invention, in the rotating electric machine according to the first or second aspect, the cooling fluid return port for returning the cooling fluid to the external cooling fluid supply unit is opened at a lower portion of the peripheral wall of the housing. Is done. By doing so, the oil component can be satisfactorily returned and blown out again between the seal member and the bearing, which is convenient. Further, since the cooling fluid is urged in the centrifugal direction by the rotation of the rotating shaft and the rotor in the rotor accommodating space, the blown refrigerant is attached to the inner peripheral surface of the peripheral wall of the housing together with the oil. Effective for circulating unnecessary oil. Further, the above-described centrifugal bias of the cooling fluid can also function as a power for circulating the cooling fluid.

In this configuration, the cooling fluid is returned from the bottom of the peripheral wall of the housing to the external cooling fluid supply unit.
The returning cooling fluid can be easily returned even if its density is low, and it is advantageous that the returning cooling fluid is accompanied by the oil staying at the bottom of the peripheral wall of the housing. According to a fourth aspect of the present invention, in the rotating electric machine according to any one of the first to third aspects, the cooling fluid is further disposed between the rotor and the bearing, and the cooling fluid is directly supplied from the rotary shaft to the rotor from the rotary port. Spouted directly into the containment space.

In this way, even if the amount of heat generated by the rotor and the stator is large, other oil-containing refrigerants except for the oil-containing refrigerant for replenishing the amount of oil necessary for the seal member and the bearing are directly transferred. Since it can be supplied to the rotor storage space, the fluid loss in the oil-containing refrigerant circulation path is reduced,
The cooling performance of the stator and the stator can be improved. According to the fifth aspect of the present invention, in the rotating electric machine according to the third and fourth aspects, the cooling fluid return port is directly opened on the opposite side of the rotor from the jet port. In this case, the cooling fluid jetted directly from the jet port into the rotor accommodating space is rotatable.
Since it flows in the rotor housing space in the axial direction and reaches the cooling fluid return port, the cooling performance of the rotor and the stator is improved.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As an external cooling fluid supply unit,
A refrigeration cycle apparatus using a rotary electric machine as an evaporator is preferable, but the cooling fluid supply unit may be configured with a pressurizing and cooling means that does not involve compression and condensation of the cooling fluid gas. Preferred embodiments of the present invention will be described in detail with reference to the following examples.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a rotating electric machine for a vehicle of a double rotor type to which the present invention is applied. (Structure and Operation of Refrigeration Cycle) This vehicular rotating electric machine is a driving device for an electric vehicle, and is a refrigeration cycle device using a motor-1 as an evaporator. Reference numeral 2 denotes an accumulator for storing a refrigerant. 4 is a compressor, 5 is a condenser, 6 is a condenser cooling fan, 7 is an expansion valve, and 8 is a temperature sensing cylinder for controlling the opening of the expansion valve 7.

A refrigeration cycle apparatus is constructed by connecting the above-described devices in a closed circuit with a refrigerant pipe. As is well known, the refrigerant gas compressed by the compressor 4 is condensed by the condenser 5,
The refrigerant is adiabatically expanded by the expansion valve 7, becomes a gas-liquid two-phase refrigerant, is introduced into the motor 1, cools the motor 1, is separated into gas and liquid by the accumulator 2, and returns to the compressor 4. . Reference numeral 9 denotes an oil return hole. Oil flowing into the refrigerant gas pipe from the oil return hole 9 is sucked into the compressor 4 together with the refrigerant gas.

Parts other than the evaporator in the refrigerant cycle device can be shared with an air conditioner mounted on a vehicle. (Basic Structure and Operation of Motor) The motor-1 has a double rotor structure having a radially inner first rotor 10, a radially outer second rotor 20 and a stator 30, Stator 30
Is fixed to the inner peripheral surface of the housing 40. The outer peripheral surface of the cylindrical second rotor 20 faces the inner peripheral surface of the stator 30 with a small gap therebetween.
The outer peripheral surface 0 faces the inner peripheral surface of the first rotor 10 with a small gap.

The stator 30 is formed by winding a three-phase stator coil around a stator core, and a three-phase AC voltage is applied to the stator coil from an inverter (not shown). The first rotor 10 also has a three-phase rotor on the rotor core.
A three-phase AC voltage is applied to this rotor coil from an inverter (not shown) through a slip ring 50. The second rotor 20 has cylindrical permanent magnets mounted on the outer periphery of a cylindrical yoke, and the permanent magnets on the outer peripheral side perform electromagnetic interaction with the stator 30 to transfer torque. The permanent magnet on the inner side performs an electromagnetic interaction with the first rotor 10 to transfer torque. For example, the first rotor 10 is connected to the engine, the second rotor 20 is connected to the wheels, and when the strike load is large, the second rotor 20 is separated from the first rotor 10 and the stator 30. When the electromagnetic load is applied, the second row
The rotor 20 is electromagnetically energized only from the first rotor 10, and in some cases, the second rotor 20 is electromagnetically energized from the first rotor 10 to generate electric power at the first rotor 10. And various operation modes are switched and executed. 60 is the first
An angle sensor for detecting the rotation angle of the rotor 10;
An angle sensor 0 detects the rotation angle of the second rotor 20. Both rotors 10 detected by the angle sensors 60 and 70,
The angle of 20 is input to a controller (not shown), and the controller controls both the inverter devices based on these input signals and performs the above-described operation modes. Since this is not the gist of this embodiment, the description is omitted.

(Detailed Structure of Motor Support Structure) Next, the motor support structure of the motor 1 will be described in detail. Housing 40
Is composed of a front frame 41, an end frame 42 for closing a rear end opening of the front frame 41, and an end cover 43 fitted to the end frame 42 to form a slip ring accommodating space therein. Become.

On the inner periphery of the front end wall of the front frame 41,
The outer bearing 101 is inserted into the outer bearing 10.
Reference numeral 1 denotes a small-diameter shaft portion of a flange-shaped outer rotary shaft 102 which is rotatably supported. The rear end of the outer rotary shaft 102 is fixed to the front end of the second rotor 200. Similarly, the outer periphery of the rear end wall of the front frame 41
The bearing 103 is fitted therein, and the outer bearing 103 rotatably supports the small diameter shaft portion of the outer rotating shaft 104 having a flange shape. The front end of the outer rotary shaft 104 is
It is fixed to the rear end of the rotor 200.

An inner bearing 201 is fitted into the inner periphery of the shaft portion of the outer rotary shaft 102, and the inner bearing 201 rotatably supports the inner rotary shaft 202. The first rotor 10 is fitted on the inner rotating shaft 202,
Fixed. Similarly, an inner bearing 203 is fitted on the inner periphery of the shaft portion of the outer rotary shaft 104, and the inner bearing 203 rotatably supports the inner rotary shaft 202.

Since the second rotor 20 has a large diameter,
The outer rotary shafts 102 and 104 have a flange shape as described above, and the second rotor 2
The structure is such that the front and rear ends are fixed. A cover 44 is fixed to the outside of the end wall of the front frame 41, and an outer seal member 110 is fitted into the cover 44 in front of the outer bearing 101, and an outer seal member is fitted. The inner periphery of 110 is in sliding contact with the outer periphery of the cylindrical portion of the outer-rotating shaft 102. Similarly, a cover 45 is fixed to the rear end of the end frame 42, and the cover 45 has an outer cover.
A seal member 111 is fitted behind the bearing 103 and the inner bearing 203, and the inner periphery of the seal member 111 is in sliding contact with the outer periphery of the cylindrical portion of the outer rotary shaft 104. Further, a cover 46 is fixed to the rear end of the end cover 43, a seal member 112 is fitted into the cover 46, and the inner periphery of the seal member 112 is in sliding contact with the outer periphery of the rotating shaft 202. . An inner seal member 210 is fitted to the inner periphery of the cylindrical portion of the outer rotary shaft 102 in front of the inner bearing 201, and the inner periphery of the inner seal member 210 is the inner rotary shaft 202. It is in sliding contact with the outer circumference.

The seal member 110 is an outer rotating shaft 102.
To prevent refrigerant leakage along the outer periphery of the seal member 21.
Numerals 0 and 111 suppress refrigerant leakage along the outer periphery of the inner rotary shaft 102. (Detailed Structure of Refrigerant Flow Path in Motor) An opening is formed at the center of the rear end wall of the end cover 43, and a refrigerant pipe extending from the expansion valve 7 is connected to this opening.

The inner rotary shaft 202 is formed with an elongated hole 300 extending axially forward from a rear end face thereof, and jet ports 301 to 303 penetrating radially from the elongated hole 300. The spout 301 is provided between the inner bearing 201 and the inner bearing.
The jet port 302 is formed between the seal member 210 and the
The spout 30 is formed immediately before the inner bearing 203.
Reference numeral 3 is formed immediately after the inner bearing 203.

The injection port 304 is a through hole formed in the outer rotary shaft 102, and is formed as an inner space between the inner bearing 201 and the inner seal member 210 and the outer bearing 101. The outer peripheral space between the outer seal member 110 and the outer seal member 110 is communicated. The spout 305 is an outer
A through hole formed in the rotating shaft 104, the inner peripheral space of the outer rotating shaft 104 located behind the inner bearing 203, and the outer periphery of the outer rotating shaft 104 located behind the outer bearing 103 It communicates with the side space.

Further, the disc portion of the outer rotary shaft 102 has a through hole 306 facing the gap between the rotors 10 and 20.
Are formed. Similarly, a through hole 307 is formed in the disk portion of the outer-rotating shaft 104. In this embodiment, each bearing is a rolling bearing, and has a structure in which the refrigerant easily passes through the gap in the axial direction. On the other hand, various known seal members can be employed.

(Explanation of Refrigerant Flow in Motor) The gas-liquid two-phase refrigerant containing the mist-like oil which has exited the expansion valve 7 passes through the opening 400 of the end cover 43 through the tapered portion of the inner rotary shaft 202. It flows into the hole 300 and is ejected from the ejection ports 301 to 303. The refrigerant flow in front of the rotor will be described with reference to FIG.

The oil-containing refrigerant blown out from the jet port 301 between the inner bearing 201 and the inner seal member 210 lubricates and cools the inner bearing 201 and the inner seal member 210. After that, a part of the oil-containing refrigerant passes through the inner bearing 201 backward, and is urged by the rotation of the first rotor 10 and the outer rotary shaft 102 to flow in the centrifugal direction. At this time, the first rotor 10, the second rotor
The front ends of the rotor 20 and the stator 30 are cooled. The remaining oil-containing refrigerant blows out from the jet port 304 between the outer bearing 101 and the outer seal member 110, and lubricates and cools the outer bearing 101 and the outer seal member 110 while cooling the outer bearing 101 and the outer seal member 110. -It is urged by the rotation of the rotating shaft 102 and flows in the centrifugal direction. Finally, the refrigerant returns to the accumulator 2 from the refrigerant outlet 500 opened at the lowermost position of the front end of the peripheral wall of the front housing 41.

The flow of the refrigerant behind the rotor will be described with reference to FIG. The oil-containing refrigerant blown out from the jet port 302 is supplied to the outer rotary shaft 104 and the two rotors 10 and 20.
The air flows in the centrifugal direction while being urged to the rear end face, and at this time, the rotors 10 and 20 and the stator 30 are cooled. Next, a part of the oil-containing refrigerant blown out from the outlet 303 immediately after the inner bearing 203 is removed.
While being lubricated and cooled, penetrates the inner bearing 203 and mixes with the oil-containing refrigerant blown out from the jet port 302.

Further, the inner bearing 2
The remaining portion of the oil-containing refrigerant blown out immediately after 03 is blown out from the jet port 305 immediately after the outer-bearing 103,
After the outer bearing 103 and the seal member 111 are lubricated and cooled, they penetrate the outer bearing 103 and then mix with the oil-containing refrigerant blown out from the jet port 302. The oil-containing refrigerant blown out from the jet ports 302 and 303 flows axially forward from the rear end of the gap between the second rotor 20 and the first rotor 10 and the stator 30, and While cooling the first rotor 10, the second rotor 20, and the stator 30, they gather at the refrigerant outlet 500,
Finally, it returns to the accumulator 2.

(Modification) If centrifugal blades are provided on the rear end face of the first rotor 10 or the second rotor 20, the flow of the oil-containing refrigerant can be further accelerated and the cooling performance can be improved. Can be. Also, if a centripetal blade for urging the oil-containing refrigerant in the radial direction is provided on the front end face of the first rotor 10 or the second rotor 20, the flow of the oil-containing refrigerant can be further accelerated. Cooling performance can be improved.

(Effects of Embodiment) According to the configuration of the above-described embodiment, it is possible to realize a rotating electric machine having excellent cooling and lubricating properties, and less wear of the seal member, thereby reducing refrigerant leakage. can do.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a part of a vehicular rotating electric machine according to an embodiment.

FIG. 2 is a block diagram illustrating a remaining portion of the rotating electric machine for a vehicle according to the embodiment.

FIG. 3 is a partially enlarged axial sectional view showing a refrigerant flow in front of a rotor of FIG. 1;

FIG. 4 is a partially enlarged axial sectional view showing a refrigerant flow behind the rotor of FIG. 1;

[Explanation of symbols]

1 is a motor, 2 is an accumulator (a part of a cooling fluid supply part), 4 is a compressor (a part of a cooling fluid supply part), 5
Is a condenser (part of the cooling fluid supply unit), 6 is an expansion valve (part of the cooling fluid supply unit), and 10 is a first rotor (rotor).
, Inner rotor), 20 is a second rotor (rotor, outer rotor), 30 is a stator 30, 41 is a front frame (part of the housing), and 42 is an end frame. (Part of the housing), 101 is an outer bearing (bearing), 102 is an outer rotating shaft (rotating shaft), 103 is an outer bearing (bearing), 104 is an outer rotating shaft (rotating shaft), 110 is Outer seal member (seal member),
111 is a seal member, 201 is an inner bearing (bearing), 202 is an inner rotary shaft (rotary shaft), 203 is an inner bearing (bearing), 210 is an inner seal member (seal member). , 301 to 305 are jet ports, 302 is a direct jet port, and 500 is a refrigerant outlet (cooling fluid return port).

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroaki Kajiura 1-1-1, Showa-cho, Kariya-shi, Aichi Pref.

Claims (5)

[Claims] 1. A stator provided in a housing, a rotating shaft having an ejection port for ejecting a cooling fluid into the stator on an outer peripheral surface, and a rotor fixed to the rotating shaft and radially inside the stator. A rotor housed in the housing space;
A plurality of bearings located on both axial sides of the rotor and rotatably supporting the rotary shaft; a seal member located on an axially opposite rotor side of the bearing and slidably contacting the outer peripheral surface of the rotary shaft;
A rotating electrical machine comprising: a cooling fluid supply unit configured to supply a cooling fluid to the rotating shaft; wherein the ejection port is formed of an oil-containing coolant and supplies the cooling fluid to the rotor accommodating space through the bearing. A rotating electric machine, which jets between the bearing and the seal member. 2. A rotating electric machine according to claim 1, wherein said stator and said inner rotor are provided with a predetermined gap between said rotor and said stator, and transmit and receive torque by electromagnetic interaction with said stator and inner rotor. A cylindrical outer rotor, an outer rotating shaft that rotatably supports both ends of the outer rotor while supporting the rotating shaft that forms the inner rotating shaft through the bearing that forms the inner bearing, and the housing. An outer bearing that rotatably supports the outer rotating shaft, an outer seal member that is located on the outer rotor side in the axial direction of the outer bearing and slides on the outer peripheral surface of the outer rotating shaft, and the outer bearing and the outer bearing. An outer outlet formed on the outer rotation shaft and located between the outer seal member and the outer seal member; The outer spout is provided between the inner bearing and the outer bearing and the inner seal member and the outer seal member, and penetrates through the outer bearing, so that the cooling fluid flows through the outer bearing and into the rotor accommodating space. A rotating electric machine, which is fed to 3. The rotating electric machine according to claim 1, further comprising a cooling fluid return port opened at a lower portion of a peripheral wall of the housing to return the cooling fluid to the cooling fluid supply unit. . 4. The rotating electric machine according to claim 1, wherein the cooling fluid is located between the rotor and the bearing and opened to the rotating shaft to accommodate the cooling fluid. A rotating electric machine having a direct ejection port for directly ejecting into a space. 5. The rotating electric machine according to claim 3, wherein said cooling fluid return port is opened on a side opposite to said direct jet port with said rotor interposed therebetween.