JPH09163680A - Outer side rotary type refrigerant cooling dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the cooling of a stator and bearings by using refrigerant like liquid. SOLUTION: A stator 2 is fixed to a fixing shaft 11 supported releasably by bearing 1a, 1b, and a rotor 3 is arranged on the outer periphery of the stator 2, via an air gap. The bearings 1a, 1b are fixed to brackets 4a, 4b fixed to the rotor 3. A refrigerant path 15 is formed in the central part of the fixing shaft 11 in the vicinity of a part to which the stator 2 is fixed. A refrigerant feeding port 6s and a refrigerant discharging outlet 6d are continuously penetrated by the same section. Through the refrigerant feeding port 6s and the refrigerant discharging outlet 6d, liquid like water, or refrigerant 7 like CFC is supplied to the refrigerant path 15, from the outside of the dynamo-electric machine. Leads of the stator 2 are led out from a trench 19 formed on the outer periphery of the fixing shaft 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer rotor type refrigerant cooling rotary electric machine in which cooling of a stator is enhanced by a refrigerant.

[0002]

2. Description of the Related Art As disclosed in Japanese Utility Model Laid-Open No. 1-79363, a conventional outer rotor type electric rotating machine has a stator fixed to a fixed shaft supported by a bearing, and a gap is formed around the outer periphery of the stator. Place the rotor through and mount the bearing on the bracket attached to the rotor. Connect a load such as a fan, a winding transmission device, or a conveyor belt to the rotor. Both ends of the fixed shaft are supported on the fixed side or cantilevered. The bearing that supports the fixed shaft may be only one side. Brackets are either fully closed or open.

[0003]

In the above-mentioned conventional example, the rotor is on the outside and is well contacted with the outside air to be cooled, and the stator is also cooled from the end of the fixed shaft and from the rotor through the air gap. It Therefore, the entire electric motor can be cooled without using an external fan or the like. However, if an attempt is made to increase the capacity of the electric motor, the stator, particularly the stator windings and the inner ring of the bearing are not sufficiently cooled, and there is a limit in increasing the capacity of the electric motor.

The point of the object of the present invention is to increase the capacity of the rotating electric machine by enhancing the cooling of the stator, especially the stator windings and the inner ring of the bearing with a refrigerant such as liquid or CFC. An object is to provide a rotor-type refrigerant cooling rotating electric machine.

[0005]

In this specification, the refrigerant means a liquid such as water or a refrigerant such as chlorofluorocarbon or air. The outer rotor type refrigerant cooling rotary electric machine according to Invention 1 is
In an outer rotor type rotary electric machine in which a stator is fixed to a fixed shaft supported by bearings, the rotor is placed around the outer periphery of the stator with a gap, and the bearing is mounted on a bracket attached to the rotor, the stator is A refrigerant passage is formed in the central portion of the fixed shaft near where it is fixed, a refrigerant supply port and a refrigerant discharge port are provided at one end and the other end of the fixed shaft, and the refrigerant supply port and the refrigerant discharge port are communicated with the refrigerant passage. Then, the lead of the stator is pulled out from the groove on the outer periphery of the fixed shaft.

According to the first aspect of the invention, the refrigerant is guided to the refrigerant passage by the refrigerant supply port and the refrigerant discharge port, cools the stator well through the fixed shaft, and the inner ring of the bearing also has the refrigerant supply port and the refrigerant discharge port. Cools well through a fixed shaft with. The groove guides the lead to the outside through the bearing without interfering with the coolant supply port or the coolant discharge port and without interfering with the inner ring of the bearing. A second aspect of the present invention is the same as the first aspect, wherein the inner diameter of the refrigerant passage is larger than that of the refrigerant supply port or the refrigerant discharge port. According to the second aspect of the present invention, the large-diameter refrigerant passage enlarges the outer peripheral area to further cool the stator.

A third aspect of the present invention is the same as the second aspect of the present invention, in which the refrigerant passage of the fixed shaft is individually divided by a plane perpendicular to the axial center and is fixed on the plane. According to the third aspect of the present invention, the refrigerant passage is prevented from being bored by the lathe from both ends of the fixed shaft, which is difficult.
The individual fixed shafts divided by the surface can be easily processed from the opened refrigerant passage by a lathe or the like, and the surface is fixed by arc welding or friction welding.

A fourth aspect of the present invention is the invention of the first, second or third aspect, wherein cooling fins or irregularities are provided on the inner surface of the refrigerant passage.
According to the fourth aspect of the invention, similarly to the first, second and third aspects, the refrigerant is guided to the refrigerant passage by the refrigerant supply port and the refrigerant discharge port, cools the stator well through the fixed shaft, and the inner ring of the bearing also cools the refrigerant. It cools well through a fixed shaft with a supply port and a coolant discharge port.
The groove guides the lead to the outside through the bearing without interfering with the coolant supply port or the coolant discharge port and without interfering with the inner ring of the bearing. The large-diameter refrigerant passage expands the outer peripheral area to cool the stator better. The individual fixed shafts divided by the surface can be easily machined from the opened refrigerant passage by a lathe, etc., without the difficult boring of the refrigerant passage from both ends of the fixed shaft by the lathe, and the surface is arc welded or friction welded. It is fixed in. Further, as a feature of the invention 4, the cooling fins or the unevenness improve the heat exchange with the refrigerant of the fixed shaft in the refrigerant passage, and cool the stator more and more.

In the outer rotor type refrigerant cooling rotary electric machine according to the fifth aspect of the invention, the stator is fixed to the fixed shaft supported by the bearing, and the rotor is arranged on the outer periphery of the stator with a gap therebetween and attached to the rotor. In an outer rotor type rotating electric machine in which a bearing is mounted on a bracket, a refrigerant passage is formed in the center of a fixed shaft near the stator is fixed, and a refrigerant supply port and a refrigerant discharge port are provided at one end of the fixed shaft. The supply port and the coolant discharge port are communicated with the coolant passage, and a partition wall closing the coolant passage is provided at the other end of the coolant passage.

According to the fifth aspect of the invention, the refrigerant is guided to the refrigerant passage by the refrigerant supply port and the refrigerant discharge port, and cools the stator well through the fixed shaft, and the inner ring of the bearing also has the refrigerant supply port and the refrigerant discharge port. Cools well through a fixed shaft with. Both the coolant supply port and the coolant discharge port are at one end of the fixed shaft, and the other end is closed by a partition wall, so the lead is a groove on the outer periphery of the other end of the fixed shaft,
It is free to guide the bearing to the outside through the hollow hole on the other end side of the partition wall provided separately. It is also free to guide the bearing to the outside from the groove on the outer periphery of one end of the fixed shaft having the coolant supply port and the coolant discharge port.

A sixth aspect of the present invention is the same as the fifth aspect, wherein the inner diameter of the refrigerant passage is larger than an enveloping circle that is concentric with the shaft center by enclosing the refrigerant supply port and the refrigerant discharge port. According to the sixth aspect of the present invention, the large-diameter refrigerant passage enlarges the outer peripheral area to cool the stator better. A seventh aspect of the present invention is the same as the sixth aspect of the present invention, in which the refrigerant passage of the fixed shaft is individually divided by a plane perpendicular to the axis, and is fixed on the plane. According to invention 7, invention 5 and invention 6
Similarly, the refrigerant is guided to the refrigerant passage by the refrigerant supply port and the refrigerant discharge port, cools the stator well through the fixed shaft, and the inner ring of the bearing also has the fixed shaft with the refrigerant supply port and the refrigerant discharge port. Cool well through. Since both the refrigerant supply port and the refrigerant discharge port are at one end of the fixed shaft and the other end is closed by a partition wall, the lead is provided on the outer peripheral groove at the other end of the fixed shaft or at the other end side of the partition wall provided separately. It is free to guide the bearing through the hollow hole to the outside. It is also free to guide the bearing to the outside from the groove on the outer periphery of one end of the fixed shaft having the coolant supply port and the coolant discharge port. The large-diameter refrigerant passage expands the outer peripheral area to cool the stator better. A feature of the invention 7 is that the individual fixed shafts divided by the surface can be easily machined from the opened refrigerant passage by a lathe or the like without the need for boring the refrigerant passage from one end of the fixed shaft by the lathe. Are fixed by arc welding or friction welding.

A eighth aspect of the present invention is the fifth, sixth or seventh aspect, wherein cooling fins or irregularities are provided on the inner surface of the refrigerant passage.
According to the eighth aspect of the present invention, the cooling fins or the irregularities improve the heat exchange with the refrigerant of the fixed shaft in the refrigerant passage, and cool the stator more and more. A ninth aspect of the present invention is the fifth, sixth, seventh or eighth aspect in which the coolant supply port and the coolant discharge port are arranged in parallel at one end of the fixed shaft. According to the ninth aspect, providing both the refrigerant supply port and the refrigerant discharge port of the fifth aspect at one end of the fixed shaft is embodied as one structure.

A tenth aspect of the present invention is the same as the fifth, sixth, seventh or eighth aspect, in which one of the coolant supply port and the coolant discharge port is directly formed on the fixed shaft, and the other is formed of a pipe and inserted into the inside of the one. Is. According to the tenth aspect, providing both the refrigerant supply port and the refrigerant discharge port of the fifth aspect at one end of the fixed shaft is embodied as another structure. An outer rotor type refrigerant cooling rotary electric machine according to an eleventh aspect of the present invention has a stator fixed to a fixed shaft supported by a bearing, the rotor being arranged on the outer periphery of the stator through a gap, and the bearing mounted on a bracket attached to the rotor. In the outer rotor type rotating electric machine to be mounted, the refrigerant passage is formed in the center of the fixed shaft near the stator to be fixed, and the refrigerant is formed by forming one of the refrigerant supply port and the refrigerant discharge port at one end of the fixed shaft. A partition wall that communicates with the passage and closes the refrigerant passage at the other end of the refrigerant passage is provided, and a fixed shaft at the other end of the partition wall is formed with a drawing hole that opens to the other end, and penetrates the partition wall in a liquid-tight or air-tight manner. The pipe extending to the other end of the fixed shaft serves as the other of the refrigerant supply port and the refrigerant discharge port.

According to the eleventh aspect, one of the refrigerant supply port and the refrigerant discharge port is formed at one end of the fixed shaft, and the other is formed of a pipe that penetrates the partition wall and extends to the other end side of the fixed shaft. To be done. The refrigerant is guided to the refrigerant passage by the refrigerant supply port and the refrigerant discharge port, well cools the stator through the fixed shaft, well cools the inner ring of the bearing at one end of the fixed shaft through the fixed shaft, and the side of the pipe. Also properly cool the inner ring of the bearing. The lead can be guided to the outside through the bearing through the bearing. However, it is free to guide the bearing to the outside through the grooves on the outer periphery of both ends of the fixed shaft.

A twelfth aspect of the present invention is the same as the eleventh aspect, wherein the inner diameter of the refrigerant passage is larger than that of the refrigerant supply port or the refrigerant discharge port. According to the twelfth aspect, the large-diameter refrigerant passage enlarges the outer peripheral area and cools the stator better. A thirteenth aspect of the present invention is the same as the twelfth aspect of the present invention, in which the refrigerant passages of the fixed shaft are individually divided by a plane perpendicular to the axis, and are fixed on the plane.
According to the invention 13, as in the invention 11 and the invention 12, one of the coolant supply port and the coolant discharge port is formed at one end of the fixed shaft, and the other penetrates the partition wall and extends to the other end side of the fixed shaft. It is formed from a pipe that is installed. The refrigerant is guided to the refrigerant passage by the refrigerant supply port and the refrigerant discharge port, well cools the stator through the fixed shaft, well cools the inner ring of the bearing at one end of the fixed shaft through the fixed shaft, and the side of the pipe. Also properly cool the inner ring of the bearing. The lead can be guided to the outside through the bearing through the bearing.
However, it is free to guide the bearing to the outside through the grooves on the outer periphery of both ends of the fixed shaft. The large-diameter refrigerant passage expands the outer peripheral area to cool the stator better. A feature of the invention 13 is that the individual fixed shafts divided by the surface can be easily machined from the opened refrigerant passage by a lathe or the like without making a difficult boring of the refrigerant passage from one end of the fixed shaft by the lathe. Are fixed by arc welding or friction welding.

A fourteenth aspect of the present invention is the same as the eleventh, twelfth, or thirteenth aspect, in which cooling fins or irregularities are provided on the inner surface of the refrigerant passage. According to the fourteenth aspect, the cooling fin or the unevenness improves the heat exchange with the refrigerant of the fixed shaft in the refrigerant passage, and cools the stator more and more. Invention 15 is invention 10 to 14
In any one of the above, the tip of the pipe communicating with the refrigerant passage is bent upward in the direction of gravity to approach the inner wall of the refrigerant passage. According to the fifteenth aspect, in the case where the refrigerant is a liquid and the flow rate is small, the refrigerant passage is short and the diameter is considerably large, even if the air is stagnated above the refrigerant passage in the gravity direction when the rotating electric machine is installed, the air is not Is discharged from the tip of.

A sixteenth aspect of the present invention is the same as the fifteenth aspect, in which a recess is formed in the refrigerant passage toward which the tip of the pipe is directed. Invention 16
According to the method, stagnant air is concentrated in the recess, and the air is better discharged from the tip of the pipe. According to another aspect of the invention, there is provided an outer rotor type refrigerant-cooled rotating electric machine in which a stator is fixed to a fixed shaft supported by a bearing, the rotor is arranged on the outer periphery of the stator through a gap, and the bearing is mounted on a bracket attached to the rotor. In the outer rotor type rotating electric machine to be mounted, the heat absorbing part of the heat pipe in which the refrigerant is sealed is embedded in the center of the fixed shaft near where the stator is fixed, and the heat generating part of the heat pipe is external to the end of the fixed shaft. Is to be placed in. According to the invention 17, the stator is well cooled by the heat pipe principle.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical sectional view including a rotary sectional view of the first embodiment, FIG. 2 is a vertical sectional view of a stator side of the second embodiment, and FIG. 3 is a rotary sectional view of the third embodiment. 5 is a vertical cross-sectional view of the stator side including FIG. 4, FIG. 4 is a vertical cross-sectional view of the stator side of the fourth embodiment, and FIG.
FIG. 11 is a vertical cross-sectional view of a stator side including a rotation-illustrated cross-sectional view of the fifth embodiment. In each figure, components having the same reference numerals have approximately the same function and may not be described.

In FIG. 1, a stator 2 having a stator winding 2a is fixed to a fixed shaft 11 supported by bearings 1a and 1b. The rotor 3 is arranged on the outer circumference of the stator 2 with a gap. The bearing 1 is attached to the brackets 4a and 4b attached to the rotor 3.
Install a and 1b. Up to this point, the conventional outer rotor type rotating electrical machine is used. A feature of the first embodiment is that a coolant passage 15 is formed in the central portion of the fixed shaft 11 near where the stator 2 is fixed, and one end and the other end of the fixed shaft 11 have a coolant supply port 6s and a coolant discharge port 6d. Is provided, and the refrigerant supply port 6s and the refrigerant discharge port 6 are provided.
and d communicate with the refrigerant passage 15. In this example,
The coolant supply port 6s, the coolant discharge port 6d, and the coolant passage 15 continuously penetrate in the same cross section. Refrigerant supply port 6s and refrigerant discharge port 6
A liquid such as water or a refrigerant 7 such as chlorofluorocarbon is supplied from the outside of the rotating electric machine to the refrigerant passage 15 via d. Stator 2
The lead 8 is pulled out from the groove 19 on the outer circumference of the fixed shaft 11.
The brackets 4a and 4b may be fully closed or open. Both ends of the fixed shaft 11 are installed on the fixed side by mounting tools (not shown).
Bearings 1a, 1b or brackets 4a, 4b for supporting 1
Also, only one side may be used.

According to the first embodiment, the refrigerant 7 is guided to the refrigerant passage 15 by the refrigerant supply port 6s and the refrigerant discharge port 6d,
The stator 2 is well cooled through the fixed shaft 11, and the bearing 1a,
The inner ring of 1b is also well cooled via a fixed shaft 11 having a coolant supply port 6s and a coolant discharge port 6d. The groove 19 guides the lead 8 to the outside through the bearing 1a without interfering with the coolant supply port 6a or interfering with the inner ring of the bearing 1a.

In the second embodiment shown in FIG. 2, the fixed shaft 21
The inner diameter of the refrigerant passage 25 is larger than that of the refrigerant supply port 6s or the refrigerant discharge port 6d. Connect the lead 8 of the stator 2 to the fixed shaft 2
1 through the groove 19 on the outer circumference. It is preferable that the coolant passage 25, which is divided into individual planes 22 perpendicular to the axis, be fixed to the plane 22 or that cooling fins 25a or irregularities be provided on the inner surface of the coolant passage 25.

According to the second embodiment, the refrigerant 7 is guided to the refrigerant passage 25 by the refrigerant supply port 6s and the refrigerant discharge port 6d,
The stator 2 is well cooled through the fixed shaft 21, and the bearing 1a,
The inner ring of 1b is also well cooled through a fixed shaft 21 having a coolant supply port 6s and a coolant discharge port 6d. The groove 19 does not interfere with the coolant supply port 6s or the coolant discharge port 6d, and the bearing 1a,
The lead 8 is guided to the outside through the bearing without interfering with the inner ring of 1b. The large-diameter refrigerant passage 25 expands the outer peripheral area to cool the stator 2 better. If the refrigerant passage 25 is divided by the surface 22, the individual fixed shafts 21 divided by the surface 22 can be opened without the difficult boring of the refrigerant passage 25 from both ends of the fixed shaft 21 by the lathe. It can be easily processed from the passage 25 with a lathe or the like, and the surface 22 is fixed by arc welding or friction welding. The cooling fins 25a or the irregularities improve the heat exchange with the refrigerant 7 of the fixed shaft 21 in the refrigerant passage 25 and cool the stator 2 more and more.

In the third embodiment shown in FIG. 3, a refrigerant passage 35 is formed in the central portion of the fixed shaft 31 near where the stator 2 is fixed, and a refrigerant supply port 36s parallel to one end of the fixed shaft 31.
And a refrigerant discharge port 36d. The refrigerant supply port 36s and the refrigerant discharge port 36d are communicated with the refrigerant passage 35, and the refrigerant passage 3
A partition wall 36 that closes the refrigerant passage 35 is provided at the other end of 5.
It is preferable that the inner diameter of the refrigerant passage 35 be larger than the enveloping circle that is concentric with the shaft center by enclosing the refrigerant supply port 36s and the refrigerant discharge port 36d. Further, the fixed shaft 31 having the refrigerant supply port 36s, the refrigerant discharge port 36d, and the refrigerant passage 35 may be manufactured by casting steel using a core, or the fixed shaft 31 may have an envelope circle of the refrigerant supply port 36s and the refrigerant discharge port 36d. May be lathe-machined together with the coolant passage 35, and then a rod having a groove between the coolant supply port 36s and the coolant discharge port 36d may be fitted therein, or one of the coolant supply port 36s and the coolant discharge port 36d may be fixed to the fixed shaft 31. The refrigerant passage 35 may be bored so as to be coincident with the axial center of the above, and the other may be eccentric. However, if the refrigerant passages 35 of the fixed shaft 31 which are individually divided by the surface 22 perpendicular to the axis are fixed on the surface 22, the work is easy. The lead 8 is guided through the hollow hole 37 on the other end side of the partition wall 36 to the outside through the bearing 1a.
Alternatively, as in the second embodiment, it may be guided to the outside from the groove on the outer circumference of the fixed shaft 31. Although not shown, cooling fins or irregularities may be provided on the inner surface of the refrigerant passage 35 as in the second embodiment.

According to the third embodiment, the coolant 7 is guided to the coolant passage 35 by the coolant supply port 36s and the coolant discharge port 36d, cools the stator 2 well via the fixed shaft 31, and the bearing 1
The inner ring of b is also well cooled through the fixed shaft 31 having the refrigerant supply port 36s and the refrigerant discharge port 36d. Refrigerant supply port 36s
And the refrigerant discharge port 36d are both at one end of the fixed shaft 31,
Since the other end is closed by the partition wall 36, the lead 8 does not lead the bearing 1a to the outside through the groove on the outer periphery of the other end of the fixed shaft 31 or the hollow hole 37 on the other end side of the partition wall which is separately provided. Be free. It is also free to guide the bearing 1b to the outside through the groove on the outer periphery of one end of the fixed shaft 31 having the refrigerant supply port 36s and the refrigerant discharge port 36d. In addition, the large-diameter refrigerant passage 35
Expands the outer peripheral area to cool the stator 2 better.
Then, the individual fixed shafts 31 divided by the surface 22 can be easily machined from the opened refrigerant passage 35 by a lathe or the like without making a difficult boring of the refrigerant passage 35 from one end of the fixed shaft 31 by the lathe. The surface 22 is fixed by arc welding or friction welding.

The fourth embodiment shown in FIG. 4 is a modification of the third embodiment, in which the refrigerant supply port 6s is formed directly on the fixed shaft 31, and the refrigerant discharge port is formed by the pipe 40 and inserted into the refrigerant supply port 6s. Be done. Further, the tip 40a of the tube 40 may be bent upward in the direction of gravity so as to approach the inner wall of the refrigerant passage 35. Further, the recess 41 may be formed in the refrigerant passage 35 to which the tip 40a of the tube 40 faces. A support tool 42 is provided near the tip of the pipe 40.
However, it may be supported by a fixed side (not shown) outside the fixed shaft 31. Although not shown, cooling fins or irregularities may be provided on the inner surface of the refrigerant passage 35 as in the second embodiment.

According to the fourth embodiment, providing both the refrigerant supply port 36s and the refrigerant discharge port 36d of the third embodiment at one end of the fixed shaft 31 is embodied as another structure. Further, when the refrigerant 7 is a liquid and has a small flow rate, and the refrigerant passage 35 is short and has a large diameter, even if the air is stagnated above the refrigerant passage 35 in the direction of gravity when the rotating electric machine is installed, the air is pipe 40. Is discharged from the tip of. Further, the stagnant air is concentrated in the recess 41, and the air is well discharged from the tip of the pipe 40. When providing cooling fins or irregularities on the inner surface of the refrigerant passage 35, the tips 40a of the tubes 40 may be near the inner periphery of the cooling fins or irregularities, and the recesses 41 may be near the outer periphery of the cooling fins or irregularities. The tube 40, the tip 40a or the recess 41 can be applied to the second or third embodiment.

In the fifth embodiment shown in FIG. 5, the bearing 1a,
The stator 2 is fixed to the fixed shaft 31 supported by 1b, and the rotor (not shown) is arranged on the outer periphery of the stator 2 with a space therebetween.
Bearings 1a, 1 are attached to a bracket (not shown) attached to the rotor.
Install b. It is a conventional outer rotor type rotating electric machine. A coolant passage 35 is formed in the central portion of the fixed shaft 31 near where the stator 2 is fixed, and a coolant supply port 6s is formed at one end of the fixed shaft 31 to communicate with the coolant passage 35. A partition wall 36 that closes the refrigerant passage 35 is provided at the other end of the refrigerant passage 35.
The fixed shaft 31 on the other end side is formed with a drawing hole 51 open to the other end. Fixed shaft 3 penetrating partition wall 36 in a liquid-tight or air-tight manner
The pipe 40 extending to the other end side of 1 is used as a refrigerant outlet. Further, the inner diameter of the refrigerant passage 35 may be larger than that of the refrigerant supply port 6s. Further, it is preferable that the refrigerant passage 35 of the fixed shaft 31 is divided by the surface 22 perpendicular to the axis to be fixed to the surface 22. Although not shown, cooling fins or irregularities may be provided on the inner surface of the refrigerant passage 35. The tip 40a of the pipe 40 communicating with the refrigerant passage 35 may be bent upward in the direction of gravity so as to approach the inner wall of the refrigerant passage 35.
6 may be deficient in the refrigerant passage 35 only by penetrating liquid-tight or air-tight. The recess 41 may be formed in the refrigerant passage 35 to which the tip 40a of the tube 40 faces. Lead 8 is pull-out hole 5
It is convenient to divert the bearing 1a from 1 and guide it to the outside.

According to the fifth embodiment, the coolant supply port 6s is formed at one end of the fixed shaft 31, and the coolant discharge port extends from the pipe 40 extending through the partition wall 36 to the other end side of the fixed shaft 31. It is formed. The coolant 7 is guided to the coolant passage 35 by the coolant supply port 6s and the pipe 40 serving as a coolant discharge port, cools the stator 2 well via the fixed shaft 31, and the bearing 1b at one end of the fixed shaft 31.
The inner ring of 1 is well cooled through the fixed shaft 31, and the inner ring of the bearing 1a on the tube 40 side is also appropriately cooled. Lead 8 is pull-out hole 5
It is possible to guide the bearing 1a from the underside of the bearing 1. However, from the grooves on the outer periphery of the fixed shaft 31 to the bearings 1a, 1b.
It is free to dive in and lead to the outside. Further, the large-diameter refrigerant passage 35 enlarges the outer peripheral area to further cool the stator 2. Further, from one end of the fixed shaft 31 to the refrigerant passage 35
The individual fixed shafts 31 divided by the surface 22 can be easily machined from the opened refrigerant passage 35 by a lathe or the like without making difficult boring by a lathe, and the surface 22 is fixed by arc welding or friction welding. It Tip 40a of tube 40 and recess 41
The action of and was explained in Example 4. In all the examples, the pipe whose tip is bent upward in the direction of gravity is limited to the coolant outlet, but in other cases, the coolant supply port and the coolant outlet can be interchanged.

Further, in the first embodiment, the refrigerant supply port 6
s, the cooling medium passage 15 or the cooling medium discharge port 6d may be provided with cooling fins or irregularities. It should be noted that, without needing to illustrate the example, the refrigerant supply port, the refrigerant discharge port, and the central portion of the fixed shaft 11, 21 or 31 having no refrigerant passage is embedded with a heat absorbing portion of a known heat pipe in which a refrigerant is sealed, When the heat generating portion of the heat pipe is arranged outside the end of the fixed shaft, the stator 2 is cooled well.

[0030]

According to the outer rotor type refrigerant cooling rotary electric machine of the first aspect of the invention, the refrigerant is guided to the refrigerant passage to cool the stator and the bearing well. According to the second aspect of the invention, the large-diameter refrigerant passage has an effect of enlarging the outer peripheral area and further cooling the stator. According to the third aspect of the invention, the individual fixed shafts divided by the surface can be easily machined from the opened refrigerant passage. According to the fourth aspect of the invention, the cooling fins or the irregularities have an effect that the heat exchange with the refrigerant of the fixed shaft in the refrigerant passage is improved and the stator is cooled more and more.

According to the outer rotor type refrigerant cooling rotary electric machine of the invention 5, there is an effect that the refrigerant is guided to the refrigerant passage to cool the stator well, and there is an effect that the lead can be drawn out to the outside freely. is there. According to the sixth aspect of the invention, the large-diameter refrigerant passage has an effect of enlarging the outer peripheral area and further cooling the stator. According to the invention 7, the individual fixed shafts divided by the surface can be easily machined from the opened refrigerant passage. According to the eighth aspect of the invention, the cooling fins or the irregularities have an effect of improving the heat exchange with the refrigerant of the fixed shaft in the refrigerant passage to cool the stator more and more.

According to the ninth aspect, there is an effect that the refrigerant supply port and the refrigerant discharge port of the fifth aspect are both provided at one end of the fixed shaft as one structure. According to the tenth aspect, there is an effect that providing both the refrigerant supply port and the refrigerant discharge port of the fifth aspect at one end of the fixed shaft is embodied as another structure. According to the outer rotor type refrigerant cooling rotary electric machine of the eleventh aspect of the invention, there is an effect that the lead can be guided to the outside through the bearing hole through the bearing. However, it is free to guide the bearing to the outside through the grooves on the outer periphery of both ends of the fixed shaft. According to the twelfth aspect, the large-diameter refrigerant passage has an effect of enlarging the outer peripheral area and further cooling the stator. According to the thirteenth aspect, the individual fixed shafts divided by the surface can be easily machined from the opened refrigerant passage. According to the fourteenth aspect of the invention, the cooling fins or the irregularities have an effect that the heat exchange with the refrigerant of the fixed shaft in the refrigerant passage is improved and the stator is cooled more and more.

According to the fifteenth aspect, when the refrigerant is a liquid and the flow rate is small, the refrigerant passage is short and the diameter is considerably large, even when the air is stagnated above the refrigerant passage in the direction of gravity when the rotary electric machine is installed, Air has the effect of being expelled from the tip of the tube. According to the sixteenth aspect, stagnant air is concentrated in the recess,
Better yet, the air is expelled from the tip of the tube.

According to the outer rotor type refrigerant cooling rotary electric machine of the seventeenth aspect, there is an effect that the stator is well cooled by the principle of the heat pipe.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view including a rotationally sectional view of a first embodiment.

FIG. 2 is a vertical cross-sectional view of a stator according to a second embodiment.

FIG. 3 is a longitudinal sectional view of a stator side including a rotational sectional view of the third embodiment.

FIG. 4 is a vertical cross-sectional view of a stator side of Example 4

FIG. 5 is a longitudinal sectional view of a stator side including a rotational sectional view of the fifth embodiment.

[Explanation of symbols]

1a Bearing 1b Bearing 2 Stator 3 Rotor 4a Bracket 4b Bracket 6s Refrigerant supply port 6d Refrigerant outlet 7 Refrigerant 8 Lead 11 Fixed shaft 15 Refrigerant passage 19 Groove 21 Fixed shaft 22 Surface 25 Refrigerant passage 25a Cooling fin 31 Fixed shaft 35 Refrigerant Passage 36 Partition wall 36s Refrigerant supply port 36d Refrigerant discharge port 37 Hollow hole 40 Tube 40a Tip 41 Recess 42 Support tool 51 Draw-out hole

Claims (17)

[Claims] 1. An outer rotor type rotary electric machine in which a stator is fixed to a fixed shaft supported by a bearing, the rotor is arranged on the outer circumference of the stator with a gap, and the bearing is mounted on a bracket attached to the rotor. In, in the vicinity of the stator is fixed to form a refrigerant passage in the central portion of the fixed shaft, one end and the other end of the fixed shaft is provided with a coolant supply port and a coolant discharge port, a coolant supply port and a coolant discharge port. Is connected to the refrigerant passage, and the lead of the stator is pulled out from the groove on the outer periphery of the fixed shaft. 2. The outer rotor type refrigerant cooling rotary electric machine according to claim 1, wherein the inner diameter of the refrigerant passage is larger than that of the refrigerant supply port or the refrigerant discharge port. Electric machinery. 3. The outer rotor type refrigerant cooling rotary electric machine according to claim 2, wherein the refrigerant passages of the fixed shaft are individually divided by a plane perpendicular to the axis, and are fixed at the plane. Outer rotor type refrigerant cooling rotating electric machine. 4. The outer rotor type refrigerant cooling rotary electric machine according to claim 1, 2 or 3, wherein cooling fins or irregularities are provided on an inner surface of the refrigerant passage. 5. An outer rotor type rotary electric machine in which a stator is fixed to a fixed shaft supported by a bearing, the rotor is arranged on the outer periphery of the stator with a gap, and the bearing is mounted on a bracket attached to the rotor. In, the refrigerant passage is formed in the center of the fixed shaft in the vicinity where the stator is fixed, the refrigerant supply port and the refrigerant discharge port are provided at one end of the fixed shaft, and the refrigerant supply port and the refrigerant discharge port are used as the refrigerant passage. An outer rotor type refrigerant cooling rotary electric machine which is provided with a partition wall which communicates with the other end of the refrigerant passage and closes the refrigerant passage. 6. The outer rotor type refrigerant cooling rotary electric machine according to claim 5, wherein an inner diameter of the refrigerant passage is larger than an enveloping circle concentric with the axis by enclosing the refrigerant supply port and the refrigerant discharge port. An outer rotor type refrigerant cooling rotating electric machine characterized by the above. 7. The outer rotor type refrigerant cooling rotary electric machine according to claim 6, wherein the refrigerant passages of the fixed shaft are individually divided by a surface perpendicular to the axial center, and fixed on the surface. Outer rotor type refrigerant cooling rotating electric machine. 8. The outer rotor type refrigerant cooling rotary electric machine according to claim 5, 6 or 7, wherein cooling fins or irregularities are provided on the inner surface of the refrigerant passage. 9. The outer rotor type refrigerant cooling rotary electric machine according to claim 5, 6, 7 or 8, wherein the refrigerant supply port and the refrigerant discharge port are arranged in parallel at one end of the fixed shaft. Sub-refrigerant cooling rotary electric machine. 10. The outer rotor type refrigerant cooling rotary electric machine according to claim 5, 6, 7 or 8, wherein one of the refrigerant supply port and the refrigerant discharge port is directly formed on the fixed shaft and the other is a pipe. An outer rotor type refrigerant cooling rotary electric machine characterized by being inserted into one inside. 11. An outer rotor type rotary electric machine in which a stator is fixed to a fixed shaft supported by a bearing, the rotor is arranged on the outer periphery of the stator with a gap, and the bearing is mounted on a bracket attached to the rotor. In, the refrigerant passage is formed in the central portion of the fixed shaft near where the stator is fixed, and one of the refrigerant supply port and the refrigerant discharge port is formed at one end of the fixed shaft to communicate with the refrigerant passage. A partition wall that closes the refrigerant passage is provided at the other end, a fixed hole on the other end side of the partition wall is formed with a drawing hole that opens to the other end, and the partition wall is penetrated liquid-tightly or airtightly to the other end side of the fixed shaft. An outer rotor type refrigerant cooling rotary electric machine, wherein the pipe extending to the other side is the other side of the refrigerant supply port and the refrigerant discharge port. 12. The outer rotor type refrigerant cooling rotary electric machine according to claim 11, wherein the inner diameter of the refrigerant passage is larger than that of the refrigerant supply port or the refrigerant discharge port. Electric machinery. 13. The outer rotor type refrigerant cooling rotary electric machine according to claim 12, wherein the refrigerant passages of the fixed shaft are individually divided by a surface perpendicular to the axis, and fixed on the surface. Outer rotor type refrigerant cooling rotating electric machine. 14. The outer rotor type refrigerant cooling rotary electric machine according to claim 11, 12 or 13, wherein cooling fins or irregularities are provided on an inner surface of the refrigerant passage. 15. The outer rotor type refrigerant cooling rotary electric machine according to any one of claims 10 to 14, wherein the tip of a pipe communicating with the refrigerant passage is bent upward in the direction of gravity so as to approach the inner wall of the refrigerant passage. An outer rotor type refrigerant cooling rotating electric machine characterized by the above. 16. The outer rotor type refrigerant cooling rotary electric machine according to claim 15, wherein a concave portion is formed in the refrigerant passage toward which the tip of the pipe is directed. 17. An outer rotor type electric rotating machine in which a stator is fixed to a fixed shaft supported by a bearing, the rotor is arranged around the outer periphery of the stator with a gap, and the bearing is mounted on a bracket attached to the rotor. In, the heat absorbing portion of the heat pipe in which the refrigerant is sealed is embedded in the central portion of the fixed shaft near where the stator is fixed, and the heat generating portion of the heat pipe is arranged outside the end of the fixed shaft. Outer rotor type refrigerant cooling rotating electric machine.