WO2008059687A1

WO2008059687A1 - Rotary motor

Info

Publication number: WO2008059687A1
Application number: PCT/JP2007/070223
Authority: WO
Inventors: Takeo Suzuki; Takeshi Inoue; Akihiko Maemura; Yuto Fukuma; Yosuke Kawazoe
Original assignee: Kabushiki Kaisha Yaskawa Denki
Priority date: 2006-11-17
Filing date: 2007-10-17
Publication date: 2008-05-22
Also published as: JPWO2008059687A1

Abstract

A rotary motor so constituted as to be effectively cooled even when it is placed under a high temperature environment. Fins (16) are formed on a rotor (13) and frame ventilation holes (26) are formed in the members of a frame (2). A gas in the frame (2) is circulated while being passed through the frame ventilation holes (26) by the fins (16) to remove the heat in the internal space of the motor (1). Furthermore, frame water channels (19) are formed in the members of the frame (2), whereby the heat of the internal gas passing through the frame ventilation holes (19) can be removed by the liquid flowing in the frame water channels (19).

Description

Specification

Rotating motor

Technical field

TECHNICAL FIELD [0001] The present invention relates to a fully-closed rotary electric motor, and particularly to an electric motor having a cooling gas circulated inside the electric motor by a fan and a cooling liquid for cooling the frame of the electric motor. Background art

For example, Patent Document 1 discloses a configuration for cooling an electric motor itself in a fully-closed rotary electric motor. In Patent Document 1, the rotor is provided with two fans (an internal fan in the stator frame and an external fan outside the stator frame), and the circulating gas is fixed while circulating the gas in the stator frame by the internal fan. The cooling air introduced from the outside by an external fan is introduced into the ventilation path provided outside the stator frame. The ventilation path is provided with a heat radiating rib for cooling. With this configuration, the heat of the gas circulated and warmed in the stator frame is transferred to the stator frame, and circulated from the cooling ribs provided in the ventilation path outside the stator frame by the cooling air from the external fan. Gas heat and heat from windings are cooled.

Patent Document 1: JP-A-9 149599

Disclosure of the invention

Problems to be solved by the invention

[0003] However, the cooling structure in the conventional fully-closed rotary motor as described above has a problem that the entire motor becomes large because the heat dissipating rib, the outer fan, and the cover of the outer fan are provided outside the stator frame. .

In addition, when the ambient temperature in which the motor is installed is particularly high, there is a problem that the circulating internal gas is not effectively cooled by the conventional cooling with the external fan and the heat radiating rib. Means for solving the problem

In order to solve the above problem, the present invention is configured as follows.

The invention according to claim 1 supports a substantially cylindrical frame that holds the stator winding on the inner peripheral surface, a bracket that seals both ends of the frame, and a bearing provided on the bracket. And a rotor that is rotated by electromagnetic action of the stator winding, and a fin is provided in the rotor, a frame ventilation hole is provided in a member of the frame, and the fin The internal gas of the frame is circulated while passing through the frame ventilation holes to remove heat from the internal space of the motor, and a frame water channel is further provided in the frame member, and the internal gas passing through the frame ventilation holes is moved forward. The rotary electric motor removes heat by the liquid flowing in the frame water channel. According to a second aspect of the present invention, the fin is provided on one end face in the axial direction of the rotor, and is a plurality of fins arranged in the rotational direction of the rotor, the fin being connected to the inner wall of the bracket. The rotary electric motor according to claim 1, wherein the rotor is provided in a space between the rotors.

The invention according to claim 3 is the rotary electric motor according to claim 2, wherein the rotor is provided with a plurality of rotor ventilation holes penetrating in the direction of the rotation axis of the rotor. The invention according to claim 4 is characterized in that one end of the rotor ventilation hole has a protruding edge, the directional force S at the tip of the protruding portion, and the same direction as the direction in which the rotor mainly rotates The rotary electric motor according to claim 3, wherein the rotary electric motor is configured to be

The invention according to claim 5 is the rotary electric motor according to claim 3, wherein the rotor ventilation hole is disposed closer to the rotation shaft than the fin and is provided at a position facing the bearing of the bracket. It is.

According to a sixth aspect of the present invention, the frame ventilation hole is a passage extending in the direction of the rotation axis in a member of the frame, and both ends of the frame ventilation hole are respectively formed on the inner peripheral surface of the frame. 2. The rotary electric motor according to claim 1, wherein the rotary motor is open so as to face the stator winding.

The invention according to claim 7 is the rotary electric motor according to claim 6, wherein one end of the frame ventilation hole opens toward a coil end portion of the stator winding. According to an eighth aspect of the present invention, the frame water channel is a plurality of water channels extending in the axial direction within the members of the frame, and the liquid flows in an axial direction opposite to each other in the adjacent frame water channel. The rotary electric motor according to claim 1 is configured as described above. In the invention according to claim 9, the bracket is composed of first and second brackets that seal both ends of the frame, and the first and second brackets are adjacent to each other in the frame water channel. 9. The rotary electric motor according to claim 8, wherein a folding groove facing only one water channel is formed, and the two water channels adjacent to the frame water channel communicate with each other by the folding groove.

The invention according to claim 10 is the rotary electric motor according to claim 8, wherein the frame ventilation holes are arranged so as to be positioned between the frame water channels. The invention according to claim 11 is provided in a substantially cylindrical frame for holding the stator winding and the stator core on the inner peripheral surface, a bracket for sealing both ends of the frame, and a bearing provided in the bracket. And a rotor that is supported and rotated by the electromagnetic action of the stator winding, and the rotor is provided with fins, and a frame ventilation groove is provided on an inner peripheral surface of the frame. The internal gas of the frame is circulated while passing through the frame ventilation groove to remove heat from the internal space of the electric motor, and a frame water channel is further provided in the frame member. It is an rotating electric motor to heat removal by the liquid flowing pre SL gas inside the frame waterway passing.

The invention according to claim 12 is the rotary electric motor according to claim 11, wherein a protrusion projecting into the frame ventilation groove is provided on the outer peripheral surface of the stator core. The invention's effect

According to the first aspect of the present invention, heat can be removed by circulating the internal gas of the electric motor using the fins, and the internal gas that has been circulated and warmed can be cooled by the cooling water channel using the liquid provided in the frame. . Of course, the heat transfer from the frame itself, that is, the stator winding, can be sufficiently removed by the cooling water channel.

According to the invention described in claim 2, since the fin provided on one side of the rotor is positioned and rotated in the space between the inner wall of the bracket, the pressure in this space rises from the space without the fin, and the internal gas It becomes easy for the circulation of.

According to the invention described in claim 3, the circulating internal gas is provided in the rotor. Since it passes through the air hole, it is easy to circulate inside.

According to the invention described in claim 4, when the rotor rotates, the gas around the hole is likely to enter the rotor ventilation hole.

According to the invention described in claim 5, since the rotor ventilation holes are opposed to the bearing, when the internal gas circulates, the circulating air is also blown to the bearing, and the heat generation of the bearing can be removed. According to the invention described in claim 6, since both ends of the frame ventilation hole face the inner peripheral surface of the frame and are opened at both ends of the stator winding, the circulating gas passes through the frame ventilation hole. At this time, the electric heat from the stator winding can be sufficiently removed.

According to the invention described in claim 7, since one end of the frame ventilation hole is configured to open to the coil end portion of the stator winding, the circulating gas collides with the coil end portion, and the coil end portion Also cut with heat removal.

According to the invention described in claim 8, since the liquid flowing in the frame water channel is configured to flow in different directions in the adjacent water channel, the entire electric motor can be uniformly cooled. According to this, it can be easily configured by the folded grooves of the first and second brackets so that the liquid flows in the adjacent frame water channels are in different directions. In addition, since the liquid flows while turning back at the first and second brackets, the first and second brackets are also cooled, so that they are held by the first and second brackets! Touch with S.

According to the invention described in claim 10, since the frame ventilation holes are arranged so as to be located between the frame water channels, when the circulated gas passes through the frame ventilation holes, it is effectively prevented by the cooling liquid in the frame water channels. Since it is cooled, the temperature of the internal gas of the motor can be increased.

According to the invention of claim 11, since a part of the outer peripheral surface of the stator core is in contact with the frame ventilation groove, when the internal gas circulates, the circulating air directly collides with the outer peripheral surface of the stator core. In order to cool the stator core, the stator springs wound around the stator core can also remove heat. In addition, by making the ventilation part of the frame into a groove shape, it is possible to easily process the frame parts compared to deep hole processing that is difficult to process in the case of frame ventilation holes. wear.

According to the invention of claim 12, since the protrusion is provided, when the internal gas circulates, the surface area of the outer peripheral surface of the stator core to which the circulating air is blown increases, so that the cooling effect of the stator core is large. Thus, the heat removal effect of the stator winding wound around the stator core can be increased.

Brief Description of Drawings

[0006] FIG. 1 is a sectional side view of a rotary electric motor according to a first embodiment of the present invention.

[Figure 2] Figure 1! /, Overall view from YY '

[Figure 3] Figure 1! / Overall view from the load side

[Fig. 4] View of only the first end ring 14 in Fig. 1 as viewed from the Z direction.

[Fig.5] View of only the second end ring 15 in Fig. 1 as viewed from the W direction

FIG. 6 is a sectional side view of a rotary electric motor according to a second embodiment of the present invention.

[Figure 7] Overall view from W 'in Figure 6

Explanation of symbols

[0007] One-rotation motor

2 frames

3 Stator winding

4 lead

5 Rotor core

6 Electromagnetic gap

7 Rotating axis

8, 9 bearings

10 A bracket

11 B bracket

12 Resonore

13 Rotor

14 First endelling

15 Second endelling 17 Screw holes for balancing

18 Rotor ventilation holes

19 Frame ventilation hole

20 Space A

21 arrow

22 Coil end

23, 24, 25 tilt

26a-t frame waterway

27 A fitting

28 B fitting

29 Folding groove

30 Stator core

31 Frame ventilation groove

32 Protrusion

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Example 1

First, an outline of the configuration of the rotary electric motor in the first embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a side sectional view of a rotary electric motor 1 according to a first embodiment of the present invention.

Reference numeral 2 denotes a cylindrical frame, and a cylindrical stator winding 3 and a stator core 30 are held on the inner periphery thereof. A lead 4 connected to the stator winding 3 is led out of the motor from a B bracket 11 to be described later, and a current is sent to the stator winding 3 through the lead 4 from a power source (not shown). . A rotor core 5 is provided on the inner periphery of the stator winding 3 via a predetermined electromagnetic gap 6. The rotor core 5 has a cylindrical shape formed by laminating thin disc-shaped electromagnetic steel plates, and a permanent magnet (not shown) is embedded therein. The rotary shaft 7 is fitted on the inner periphery of the rotor core 5! /, And do not rotate with each other! / It is fixed.

On the other hand, both ends of the cylindrical frame 2 are attached so as to seal the internal spaces of the A bracket 10, the B bracket 11 and the force frame 2. The A bracket 10 holds the outer periphery of the bearing 8, and the B bracket 11 holds the outer periphery of the bearing 9. Both ends of the rotary shaft 7 are fitted into the inner circumferences of the bearings 8 and 9, respectively, so that the rotary shaft 7 is held rotatably. One end of the rotary shaft 7 penetrates the A bracket 10, and a load (not shown) is attached to the front end. On the other hand, a resolver 12 is provided at the other end of the rotary shaft 7! /, And is configured to detect the angle of the rotary shaft 7! /.

The above is the outline of the configuration of the rotary motor according to the first embodiment of the present invention, and these are already known configurations. In this embodiment, a so-called IPM motor configuration is shown. Hereinafter, for convenience of explanation, the right side in FIG. 1, that is, the A bracket 10 side is referred to as the load side, and the left side in FIG. The rotor core 5 and the rotating shaft 7 are collectively referred to as a rotor 13.

[0010] Needless to say, in the rotary electric motor as described above, it is necessary to radiate mainly heat loss generated in the stator winding 3 and the rotor core 5. Therefore, in the present invention, generally, the fin is provided in the rotor to circulate the gas in the space of the frame 2 to remove this heat, and the cooling liquid circulated in the members of the frame 2 A configuration for efficiently cooling the gas circulated in the frame 2 while cooling is disclosed. That is, the present invention has a cooling structure by air cooling and water cooling (liquid cooling), and these cooling structures will be described below. In describing the cooling structure, refer to FIG. 2 and FIG. 3 in addition to FIG. Figure 2 shows the overall view from YY 'in Figure 1. In other words, FIG. 2 is a view seen from the side opposite to the load, and shows a perspective view of the B bracket 11. Fig. 3 shows an overall view from the load side in Fig. 1. Therefore, the XX 'cross-sectional view in Fig. 2 or Fig. 3 is Fig. 1.

[0011] First, an air cooling configuration for removing heat from the inside of the electric motor while circulating the gas in the frame 2 will be described. As shown in FIG. 1, in this embodiment, a first end ring 14 and a second end ring 15 are provided at both ends of the rotor core 5. These end rings are formed integrally with the rotor core 5 so as to sandwich the rotor core 5 from both ends. Figure 1 Fig. 4 shows only the first end ring 14 as seen from the Z direction. Further, FIG. 5 shows only the second end ring 15 as viewed from the W direction in FIG.

The first end ring 14 is provided with a plurality of fins 16 on one surface thereof. The fins 16 are erected almost vertically from the first end ring 14, and are arranged near the outer peripheral portion of the first end ring 14, and a plurality of fins 16 are arranged over the entire periphery! In the present embodiment, it is equally divided into eight places on the entire circumference. Reference numeral 17 denotes a balancing screw hole provided in the same manner as the arrangement of the fins 16 for attaching a weight or the like to remove centrifugal force due to eccentricity when the rotor 13 rotates. Further, the first end ring 14 is provided with a plurality of rotor ventilation holes 18 on the further center side of the fins 16. The rotor ventilation holes 18 pass through the first end ring 14. In the present embodiment, it is equally divided into eight places on the entire circumference.

The same number of rotor ventilation holes 18 are formed in the rotor core 5 at positions corresponding to the rotor ventilation holes 18 of the first end ring 14.

Further, the same number of rotor ventilation holes 18 are formed in the second end ring 15 at positions corresponding to the first end ring 14 and the rotor ventilation holes 18 of the rotor core 5.

Therefore, the rotor ventilation hole 18 is formed as a ventilation path of the rotor 13 penetrating from the load side to the anti-load side.

On the other hand, as shown in FIG. 1, the frame 2 is provided with a frame ventilation hole 19. The frame ventilation hole 19 is a hole provided in the member of the frame 2 so as to be substantially along the axial direction of the rotary shaft 7, and one end of the hole is on the load side of the A bracket 10 and the stator winding 3. There is an opening (penetration) in the space between the parts. Further, the other end of the hole penetrates the space between the B bracket 11 and the anti-load side portion of the stator winding 3. As shown in FIG. 2 or FIG. 3, a plurality of frame ventilation holes 19 are provided on the entire circumference of the member of the cylindrical frame 2. In this example, it is arranged at 5 locations all around!

According to the above configuration, when the rotor 13 rotates, the pressure in the portion of the A space 20 in FIG. 1 increases due to the action of the fins 16, so that the gas in the internal space of the frame 2 flows as shown by the arrow 21, It enters the vent hole 19. The gas that has passed through the frame ventilation hole 19 moves from the load side to the anti-load side, and enters the internal space of the frame 2 again. And The gas enters the rotor ventilation hole 18 of the rotor 13 and the electromagnetic gap 6 while passing through the coil end 22 of the stator winding 3. The rotor ventilation hole 18 and the electromagnetic gap 6 reach the load side space of the rotor 13 while moving from the opposite load side to the load side.

Thus, if the rotor 13 is rotating, the gas in the internal space in the frame 2 circulates, and the stator winding 3, the rotor core 5, and the coil end 22 are cooled. Further, if the rotor ventilation hole 18 is arranged at a position facing the housing portion of the A bracket 10 that holds the outer periphery of the bearing 8 or the bearing 8 as in this embodiment, the cooling of the bearing 8 is also expected. it can.

In addition, as shown in FIG. 4, the rotor ventilation holes 18 and the like of the second end ring 15 are formed so that a part of the edge of the hole protrudes and the tip of the protruding part is sharp. ing. The pointed direction is arranged to be the same direction as the rotation direction in which the present motor is mainly used, as indicated by the rotation direction of the arrow in FIG. For example, if an electric motor is used for a generator, the rotation direction mainly used is naturally determined. With this shape, the surrounding gas is easily drawn into the hole from the rotor ventilation hole 18 of the second end ring 15. Further, in this embodiment, as shown in FIG. 1, the end of the frame ventilation hole 19 penetrating into the internal space of the frame 2 is inclined as indicated by 23, or the bearing of the A bracket 10 facing the fin 16 8 By inclining the housing portion of the bearing 9 as shown by 24, or by inclining the housing portion of the bearing 9 of the B bracket 11 facing the opposite side of the rotor 13 as shown by 25, the above gas It is configured so that the circulation of the air is eliminated without resistance.

[0014] Next, a water-cooling configuration in which cooling is performed by the cooling liquid circulated through the members of the frame 2 will be described.

As shown in FIGS. 1, 2 and 3, in this embodiment, a total of 20 water channels 26a to 26t are formed in the member of the frame 2 in the same direction as the axial direction of the rotary shaft 7, By circulating a cooling liquid such as cooling water through these water channels, the heat mainly transmitted from the stator winding 3 is removed. An inlet for injecting liquid into the frame water channels 26a to 26t is an A joint 27, and an outlet force for allowing the liquid to flow out is a joint 28. In this embodiment, the A joint 27 and the B joint 28 are inserted into the B bracket 11. Although not specifically described below, a seal member such as an O-ring is appropriately provided around the portion connecting the water channels so that no liquid leakage occurs. The liquid flowing in from the A joint 27 first enters the 26a channel. It flows in and moves to the load side. On the other hand, on the load side of the water channel 26a, the folded groove 29 formed in the A bracket 10 is formed so as to face the water channel 26a, so that the liquid flows into the folded groove 29. Further, since the folding groove 29 is formed so as to be opposed to and communicate with the water channel 26b adjacent to the water channel 26a, the liquid flows into the water channel 26b so as to be folded back at the folding groove 29, and this time, the load is counter-loaded from the load side. Move to the side. On the opposite load side of the water channel 26b, the folded groove 29 formed in the B bracket 11 is formed so as to face the water channel 26b, so that the liquid flows into the folded groove 29. Similarly, since the folding groove 29 is formed so as to be opposed to and communicate with the water channel 26c adjacent to the water channel 26b, the liquid turns back again and flows into the water channel 26c, and again moves from the anti-load side to the load side. To do. Thereafter, with the same configuration, the cooling liquid moves in the adjacent water channels 26a to 26t while moving from the load side to the counter load side, and finally flows out from the B joint 28. Therefore, the heat transferred from the stator winding 3 is removed while moving through the water channels 26 in the members of the frame 2.

[0015] Here, particularly in the members of the frame 2, the positional relationship between the frame ventilation holes 19 described above for the air cooling structure and the frame water passages 26a to 26t described for the water cooling structure will be supplemented. In the present invention, by arranging the frame ventilation holes between the plurality of frame water channels, the gas circulated through the frame 2 and warmed is removed by the frame water channels 26 when passing through the frame ventilation holes 19. It is configured as follows. That is, as shown in FIG. 2 or FIG. 3, the frame ventilation hole 19 has a force at five locations on the entire circumference. The plurality of frame ventilation holes 19 are located between the frame water channels 26a to 26t in the frame 2 member. It is arranged as follows. Further, the frame ventilation holes 19 can be arranged without interfering with the frame water channels 26 because both ends of each ventilation hole are formed so as to penetrate the inner peripheral surface of the cylindrical frame 2.

Accordingly, in the present invention, the heat generated in the stator winding 3 and the rotor 13 is removed from the frame 2 by the water cooling configuration, and is circulated through the internal space of the frame 2 by the air cooling configuration. Heat is also removed by gas. The circulating and warmed gas removes heat inside the motor while being removed by the action of the water cooling structure in the frame 2 member, so even if the motor is placed in a high temperature environment, the temperature of the gas inside the motor Does not rise excessively. Example 2 Next, an outline of the configuration of the rotary motor in the second embodiment of the present invention will be described with reference to FIGS. 6 and 7. FIG. FIG. 6 shows a sectional side view of the rotary electric motor 1 according to the second embodiment of the present invention. Figure 7 shows the overall view from VV 'in Figure 6. That is, FIG. 7 is a view seen from the side opposite to the load, and shows a perspective view of the B bracket 11. Note that the description of the same components as those of the first embodiment in the second embodiment is omitted, and different points will be described. The second embodiment is different from the first embodiment in the air cooling configuration. In the figure, 31 is a frame ventilation groove, 32 is a protrusion provided on the outer periphery of the stator core, and frame ventilation groove 31 is a groove provided on the inner periphery of frame 2, which is provided along the axial direction of frame 2. It has been. As shown in FIG. 7, the cross section of the groove is U-shaped and penetrates the inner periphery of the frame 2 at the top of the U-shape. In addition, a total of five locations are provided at positions that do not interfere with the frame water channel 26 on the entire circumference of the cylinder of the frame 2.

The protrusion 32 is an outer peripheral portion of the stator core 30 and is provided along the axial direction of the stator core 30. As shown in FIG. 7, the protrusion has a substantially triangular cross section and is formed so as to protrude into the frame ventilation groove 31.

That is, the second embodiment of the present invention is different from the first embodiment in that the frame ventilation hole 19 is penetrated to the inner peripheral surface of the frame 2 to form a groove-shaped frame ventilation groove 31 and the stator. The protrusion 32 is provided on the outer peripheral surface of the core 30 so as to protrude into the frame ventilation groove 31.

It is desirable that the protrusion 32 has a small total cross-sectional area in the axial direction so that it does not become a resistance of the circulating gas and has a large total area protruding into the frame ventilation groove 31. Therefore, in this embodiment, it is better to provide a small groove around the force triangle having a triangular cross section and to increase the surface area of the protrusion 32. In consideration of heat transfer, the protrusion 32 is preferably integrated with the stator core 30. As an example, when the stator core 30 is formed by laminating thin disk-shaped electromagnetic steel plates, the stator core 30 may be manufactured by laminating thin electromagnetic steel plates having protrusions 32. As another example, when magnetic steel sheets are laminated and welded, the bead of the welded portion may be formed into a protruding shape such as the protruding portion 32.

Next, the function and effect of the air cooling configuration according to the second embodiment of the present invention will be described. In this embodiment, when the internal gas in the frame 2 circulates, a partial force on the outer peripheral surface of the stator core 30 is in contact with the S-frame ventilation groove 31, so that the circulating gas also flows on the outer peripheral surface of the stator core 30. The stator core 30 is cooled by direct contact. For this reason, in the second embodiment, the stator winding 3 held by the stator core 30 on the inner periphery can also remove heat from the stator core 30 side, and the stator winding 3, which is the main heat source, is effective. Heat can be removed.

Furthermore, by providing the protrusion 32 on the outer peripheral surface of the stator core 30 so as to protrude into the frame ventilation groove 31, the surface area of the outer peripheral surface of the stator core 30 with which the circulating gas comes into contact is increased. The cooling effect of the stator core 30 is increased, and the heat removal effect of the stator winding 3 wound around the stator core 30 can be increased.

In addition, since the ventilation part of frame 2 has a groove shape, it is easier to machine two parts of the frame compared to the hole machining, which is difficult to drill deeply like the frame ventilation hole 19 in the first embodiment. I can.

Industrial applicability

INDUSTRIAL APPLICABILITY The present invention can be used for a rotary motor that cools by using both a fan and a cooling liquid in addition to a fully-closed rotary motor.

Claims

The scope of the claims

[1] A substantially cylindrical frame that holds a stator winding and a stator core on an inner peripheral surface, a bracket that seals both ends of the frame, and a bearing provided on the bracket, and the stator And a rotor that rotates by electromagnetic action of windings! /, And a fin in the rotor and a frame ventilation hole in a member of the frame, and the fin allows the frame to The internal gas of the motor is circulated while passing through the frame ventilation holes to remove heat from the internal space of the motor.

A rotary electric motor characterized in that a frame water channel is further provided in a member of the frame, and the internal gas passing through the frame ventilation hole is removed by heat flowing through the frame water channel.

[2] The fins are a plurality of fins that protrude from one end surface in the axial direction of the rotor and are arranged in the rotation direction of the rotor, and the fins are located in a space between the inner wall of the bracket. The rotary electric machine according to claim 1, wherein the rotary electric machine is provided on the rotor.

3. The rotary electric motor according to claim 2, wherein the rotor is provided with a plurality of rotor ventilation holes penetrating in the rotation axis direction of the rotor.

[4] One end of the rotor ventilation hole has a protruding edge, and the direction force at the tip of the protruding portion is formed to be in the same direction as the direction in which the rotor mainly rotates. 4. The rotary electric motor according to claim 3, wherein

5. The rotary motor according to claim 3, wherein the rotor ventilation hole is disposed closer to the rotation axis than the fin and is provided at a position facing the bearing of the bracket.

[6] The frame ventilation hole is a passage extending substantially in the direction of the rotation axis in the frame member, and both ends of the frame ventilation hole are directed toward the inner peripheral surface of the frame, and are fixed. 2. The rotating motor according to claim 1, wherein the rotating motor is opened so as to sandwich the child winding.

7. The rotary electric motor according to claim 6, wherein one end of the frame ventilation hole opens toward a coil end portion of the stator winding.

[8] The frame water channel is a plurality of water channels extending in the axial direction in the frame member, and the liquid is configured to flow in the axial direction opposite to each other in the adjacent frame water channel. The rotary electric motor according to claim 1.

[9] The bracket is composed of first and second brackets that seal both ends of the frame, and the first and second brackets face only two adjacent water channels out of the frame water channels. 9. The rotary electric motor according to claim 8, wherein a folding groove is formed, and the two water channels adjacent to the frame water channel are communicated with each other by the folding groove.

10. The rotary electric motor according to claim 8, wherein the frame ventilation holes are arranged so as to be positioned between the frame water channels.

[11] A substantially cylindrical frame that holds the stator winding and the stator core on the inner peripheral surface, a bracket that seals both ends of the frame, and a bearing provided on the bracket, and the stator And a rotor that is rotated by electromagnetic action of the winding! /, And a fin on the rotor and a frame ventilation groove on the inner peripheral surface of the frame, The internal gas in the frame is circulated while passing through the frame ventilation groove to remove heat from the internal space of the motor.

12. The rotary electric motor according to claim 11, wherein a projection protruding into the frame ventilation groove is provided on the outer peripheral surface of the stator core.