KR20200082284A - Rotating electric machine - Google Patents

Abstract

The present invention relates to a rotating electrical machine. The rotating electrical machine comprises: a frame having an accommodation space formed inside; a stator disposed inside the frame; a rotor disposed to be rotatable with regard to the stator; and a ventilation unit formed to be penetrated in an axial direction so that air flows in a mutual contact region of the frame and the stator. Accordingly, an increase in the inner temperature of the frame can be suppressed to operate the stator and the rotor at a low temperature so as to enhance operation efficiency.

Description

Rotating Electric Machine {ROTATING ELECTRIC MACHINE}

The present invention relates to a rotating electric machine.

As is well known, a rotating electric machine means a machine having a stator and a rotor rotatably provided with respect to the stator.

Some of the rotating electric machines are generators that convert mechanical energy into electrical energy, and other parts are composed of electric motors that convert electrical energy into mechanical energy. Another part of the rotary electric machine is selectively configured to function as an electric motor or a generator, respectively.

However, in such a conventional rotary electric machine, during operation, the temperature rises due to the heating action of the armature winding, and when the temperature rises excessively, there is a problem that the output decreases due to an increase in the thermal resistance of the armature winding. .

In addition, in such a conventional rotary electric machine, the fan and the rotor are arranged on one side along the axial direction of the stator and the rotor to cool the stator and the rotor by forced blowing, but the air flow cross-sectional area of the ventilation passage is It is not enough that there is a limit to lowering the overall temperature of the rotating electric machine.

In addition, such a conventional rotary electric machine has a problem that the life of the bearing is shortened when the temperature of the bearing rotatably supporting the rotating shaft of the rotor is increased.

In particular, when the rotating electric machine is implemented as a generator, a driven pulley is provided on the rotating shaft to receive a driving force driving the rotating shaft, and the tension of the belt coupled to the driven pulley acts on the rotating shaft to damage the bearing. There is a problem that this is promoted, and due to this, the life of the bearing is shortened more quickly.

In addition, when the rotating electric machine is implemented as a generator, and the temperature of the permanent magnet of the rotor is excessively increased, there is a problem that performance deterioration due to irreversible demagnetization of the permanent magnet occurs.

KR 1020020021874 A

Accordingly, an object of the present invention is to provide a rotary electric machine capable of suppressing an increase in the internal temperature of the frame.

In addition, another object of the present invention is to provide a rotary electric machine capable of suppressing a rise in temperature of a bearing.

In addition, another object of the present invention is to provide a rotary electric machine capable of increasing the air volume of the cooling fan to improve cooling performance.

Another object of the present invention is to provide a rotary electric machine capable of increasing the ventilation area while suppressing component deformation.

The present invention, in order to achieve the above object, a frame in which the receiving space is formed inside; A stator disposed inside the frame; A rotor rotatably disposed with respect to the stator; And a ventilation part formed through the axial direction so that air can flow into the mutual contact area between the frame and the stator.

to provide.

According to an embodiment of the present invention, the vent portion is configured to include a frame vent portion recessed in the inner surface of the frame.

According to an embodiment of the present invention, the vent portion is configured to include a stator vent portion recessed in the outer surface of the stator.

According to an embodiment of the present invention, the stator includes a stator core in which teeth and slots are alternately formed along a circumferential direction; And stator coils respectively wound around the teeth, and the stator vent portions are respectively formed to correspond to the teeth on the outer surface of the stator core.

According to an embodiment of the present invention, the stator vent portions are respectively formed symmetrically with respect to the center line of the teeth.

According to one embodiment of the present invention, the depth in the radial direction of the stator vent portion is composed of 25 to 80% of the thickness between the outer surface of the stator core and the slot.

According to an embodiment of the present invention, the length in the circumferential direction of the stator vent portion is 30 to 80% of the width in the circumferential direction of the teeth.

According to an embodiment of the present invention, the vent portion is configured to include a frame vent portion recessed on the inner surface of the frame and a stator vent portion recessed on the outer surface of the stator.

According to an embodiment of the present invention, the frame, the cylindrical portion of both sides open cylindrical shape; And a first bracket and a second bracket coupled to block both ends of the cylindrical portion, respectively, and bearings rotatably supporting the rotation axis of the rotor are respectively accommodated in the first bracket and the second bracket. Each coupling portion is provided, and the bearing coupling portion is provided with a bearing ventilation portion to allow air to flow into the bearing coupling portion.

According to an embodiment of the present invention, the bearing coupling portion is formed to protrude from the inner surfaces of the first bracket and the second bracket, respectively.

According to an embodiment of the present invention, the rotating shaft extends outwardly through the first bracket, and in the region disposed outside the first bracket of the rotating shaft, the other side of the belt, on which one side is coupled to the drive pulley, A driven pulley to be coupled is provided, and the bearing vent portion disposed on the drive pulley side of the bearing engaging portion along the direction in which the tension of the belt acts is formed to reduce the flow cross-sectional area along the axial direction.

According to an embodiment of the present invention, along the direction in which the tension of the belt acts, a reinforcement portion is formed on the outside of the bearing vent portion disposed on the drive pulley side of the bearing coupling portion to increase the thickness.

According to an embodiment of the present invention, the bearing coupling portion of the first bracket has a blocking portion formed to be blocked on one side along the axial direction, and the blocking portion is grooved so that air introduced into the bearing ventilation portion can be introduced. Is formed in the depression.

According to an embodiment of the present invention, the bearing coupling portion of the first bracket is provided with a rotating shaft hole to allow the rotating shaft to pass through, and a recessed portion to allow air to flow into the mutual contact area between the rotating shaft hole and the rotating shaft It is provided.

According to an embodiment of the present invention, it is configured to further include; a blowing fan for blowing air to allow air to flow into the vent portion.

The blowing fan, a fan having a plurality of blades; And a motor that drives the fan to rotate.

As described above, according to an embodiment of the present invention, by providing a vent portion to allow air to flow into the mutual contact area between the frame and the stator, it is possible to suppress the temperature rise of the stator.

Further, by forming the stator vent portion on the outer surface of the stator to correspond to the stator's teeth, the occurrence of deformation of the stator can be suppressed and the temperature rise of the stator can be suppressed.

In addition, by providing a bearing ventilation portion to allow air to flow into the bearing coupling portion, it is possible to suppress a rise in temperature of the bearing.

In addition, by providing a reinforced portion having an increased thickness on the outside of the bearing vent portion disposed on the drive pulley side along the direction in which the tension of the belt acts, it is possible to suppress the temperature rise of the bearing while suppressing deformation of the bearing coupling portion.

In addition, the bearing vent portion disposed on the driving pulley side along the direction in which the tension of the belt acts is formed such that the air flow cross-sectional area is reduced along the axial direction, thereby suppressing deformation of parts and suppressing the temperature rise of the bearing.

In addition, by lowering the frame ventilation part and the stator ventilation part respectively in the mutual contact areas of the frame and the stator, the ventilation area and the air volume of the blower fan are increased to improve cooling performance.

1 is a perspective view of a rotating electric machine according to an embodiment of the present invention,
Figure 2 is a cross-sectional view of Figure 1,
Figure 3 is a side cross-sectional view of Figure 2,
Figure 4 is an enlarged view of the vent portion of Figure 3,
Figure 5 is an enlarged view of the bearing ventilation portion of the first bracket of Figure 2,
Figure 6 is a rear view of the first bracket of Figure 2,
7 is a perspective view of the first bracket of FIG. 6,
8 is a modification of the first bracket of FIG. 6,
9 is a cross-sectional view of the coupled state of Figure 8,
10 is a perspective view of the first bracket of FIG. 8,
11 is a modification of the first bracket of FIG. 6,
12 is a perspective view of the first bracket of FIG. 11,
13 is a cross-sectional view of the engaged state of FIG. 11,
14 is a perspective view of the depression of the rotating shaft of FIG. 13.

Hereinafter, exemplary embodiments disclosed herein will be described in detail with reference to the accompanying drawings. In this specification, the same or similar reference numerals are assigned to the same or similar configurations in different embodiments, and the description is replaced with the first description. As used herein, a singular expression includes a plural expression unless the context clearly indicates otherwise. In addition, in describing the embodiments disclosed in this specification, detailed descriptions of related well-known technologies are omitted when it is determined that they may obscure the gist of the embodiments disclosed herein. In addition, it should be noted that the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and should not be interpreted as limiting the technical spirit disclosed in the present specification by the accompanying drawings.

1 is a perspective view of a rotating electric machine according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of FIG. 1. 1 and 2, the rotary electric machine according to an embodiment of the present invention includes a frame 110, a stator 210, a rotor 250, and a ventilation part 310.

The frame 110 has an accommodation space formed therein. The frame 110 may include, for example, a cylindrical portion 120 having both sides open, a first bracket 150 and a second bracket coupled to block both sides of the cylindrical portion 120 ( 180). A guide pin hole 122 is formed through the frame 110 so that a guide pin can be inserted along the axial direction. A fastening member inserting portion 124 through which a fastening member for fastening the cylindrical part 120 and the first bracket 150 and the second bracket 180 is inserted is formed through the frame 110. An accommodating space of a circular cross section is formed inside the cylindrical portion 120. The lower portion of the cylindrical portion 120 is provided with a flange portion 125 to be fixedly coupled to the support object. A fastening member coupling portion 127 is formed through the flange portion 125 so that a fastening member can be inserted and coupled.

The stator 210 is provided inside the frame 110. The stator 210 includes a stator core 220 in which teeth 226 and slots 228 are alternately formed along the circumferential direction, and a stator coil 231 concentrated around the teeth 226. To be equipped. The stator core 220 may be configured by insulatingly stacking a circular electric steel plate 222 provided with the teeth 226 and slots 228. The stator core 220 includes a yoke 224 disposed outside the slot 228. The stator core 220 may be coupled to the inside of the frame 110 (cylindrical portion 120), for example, by pressing. The teeth 226 of the stator core 220 are composed of, for example, nine, and the stator coil 231 is composed of a concentrated winding wound around the teeth 226. Inside the stator 210, the rotor 250 is rotatably accommodated with an air gap 240 therebetween. A rotor receiving hole 223 is formed through the center of the stator core 220 so that the rotor 250 can be rotatably received.

The rotor 250 includes a rotating shaft 255, a rotor core 260 rotating about the rotating shaft 255, and a permanent magnet 270 inserted into the rotor core 260. When the rotating shaft 255 is rotated by an external force, an induced electromotive force is induced to the stator coil 231, and the rotating electric machine can function as a generator.

A rotating shaft hole 262 is formed through the center of the rotor core 260 so that the rotating shaft 255 can be inserted. The rotor core 260 is provided with a permanent magnet insertion portion 264 so that the permanent magnet 270 can be inserted. The permanent magnet inserting portions 264 are formed to pass through the rotary shaft hole 262 along the axial direction, respectively. The permanent magnet 270 is formed such that different magnetic poles are alternately arranged along the circumferential direction of the rotor core 260. On both sides of the rotating shaft 255, bearings 160 for rotatably supporting the rotating shaft 255 are respectively provided.

The first bracket 150 and the second bracket 180 are provided with bearing coupling portions 155 and 185 to which the bearing 160 is accommodated. A blower fan 280 is provided at one side of the frame 110. The blowing fan 280 may be provided on one side of the second bracket 180, for example. The blowing fan 280 may blow air to move outside the first bracket 150 via the second bracket 180, the stator 210, and the rotor 250. The first bracket 150 and the second bracket 180 are respectively provided with a plurality of communication portions 152 and 182 formed through a plate surface to allow air to pass therethrough.

The blower fan 280 is configured of, for example, an axial flow fan capable of blowing in the axial direction. The blower fan 280 is configured, for example, separately from the rotating shaft 255. According to this configuration, the load of the rotor 250 can be reduced. In addition, it is possible to blow a constant amount of air regardless of the rotation of the rotor 250 to ensure a predetermined constant cooling performance. More specifically, for example, the blower fan 280 includes a fan portion 281 and a fan portion 281 having a hub 283 and a plurality of blades 285 provided around the hub 283. It is configured to include a motor 291 to drive rotation. More specifically, the motor 291 may be provided inside the hub 283. The motor 291 is a stator 293 fixedly disposed inside the hub 283, a rotor 295 rotatably disposed with respect to the stator 293, and connected to the hub 283 and the rotor And a support shaft 297 rotatably supporting the 295. A plurality of bearings 299 are provided between the support shaft 297 and the rotor 295. The blower fan 280 is not specifically shown in the drawing, but may include a casing formed to be coupled to the second bracket 180.

Meanwhile, the ventilation part 310 is provided in the mutual contact area of the frame 110 and the stator 210. The ventilation part 310 is configured to allow air to flow into the mutual contact area between the frame 110 and the stator 210, for example.

FIG. 3 is a side sectional view of FIG. 2, and FIG. 4 is an enlarged view of the vent portion of FIG. 3. 3 and 4, the ventilation part 310 may include a frame ventilation part 311 that is recessed on the inner surface of the frame 110. The frame ventilation part 311 may be formed to be recessed in the radial direction and extend axially on the inner surface of the cylindrical part 120 of the frame 110, for example. The frame ventilation part 311 may be formed over the entire length of the frame 110 (cylinder part 120).

The ventilation part 310 may include a stator ventilation part 321 that is recessed on the outer surface of the stator 210. The stator vent portion 321 may be formed to be recessed in the radial direction on the outer surface of the stator core 220 and to extend in the axial direction. The stator vent part 321 may be formed over the entire length (stack thickness) of the stator core 220.

The stator venting portions 321 may be respectively formed to correspond to the teeth 226 of the stator core 220. Accordingly, deformation of the stator 210 (the stator core 220) when the stator 210 is coupled to the inside of the frame 110 can be suppressed. The stator vent part 321 may be formed symmetrically with respect to the center line Lc of the tooth 226, as shown in FIG. 4. The frame ventilation part 311 and the stator ventilation part 321 may be configured to form a single ventilation part (air passage) in a mutually cooperative manner. The length of the circumferential direction of the frame ventilation portion 311 may be the same as the length of the circumferential direction of the stator ventilation portion 321.

In this embodiment, the radial depth D of the stator vent portion 321 is, for example, the thickness between the outer surface of the stator core 220 and the slot 228 (of the stator core 220). It may be composed of 25 to 80% of the width (Wy) of the yoke 224.

The circumferential length L of the stator vent portion 321 may be, for example, 30 to 80% of the circumferential width Wt of the teeth 226.

In this embodiment, the stator core 220, for example, if the outer diameter is 220mm, the width (Wy) of the yoke 224 is 12mm, the width (Wt) of the teeth 226 is 26mm, the stator barrel The radial depth D of the base 321 may be composed of 3.0 to 9.6 mm. The circumferential length L of the stator vent portion 321 may be configured to be 7.8 to 20.8 mm.

Here, when the radial depth D of the stator vent portion 321 exceeds 80% of the width Wy of the yoke 224 of the stator core 220, the magnitude of the no-load induced voltage is 1%. It may be reduced to less than, and the THD (Total Harmonic Distortion, THD) may exceed a set range (limiting condition) set to less than 5%. When the THD is increased, desorption, vibration, and heat may occur, and the efficiency of the device may be impaired.

In addition, when the circumferential length L of the stator vent portion 321 exceeds 80% of the width Wt of the teeth 226 of the stator core 220, the magnitude of the no-load induced voltage is 1%. Less than, the THD (Total Harmonic Distortion, THD) may exceed the set range set to less than 5%.

Meanwhile, bearing coupling portions 155 and 185 of the first bracket 150 and the second bracket 180 may be formed to protrude in the axial direction from the inner surfaces of the first bracket 150 and the second bracket 180, respectively. Can. A bearing ventilation part 331 may be formed in the bearing coupling part 155 of the first bracket 150 to allow air to flow in. In this embodiment, the bearing coupling portion 185 of the second bracket 180 is not specifically shown in the drawings, but the bearing ventilation portion 331 is also applied to the bearing coupling portion 185 of the second bracket 180. May be formed.

5 is an enlarged view of the bearing ventilation part of the first bracket of FIG. 2, FIG. 6 is a rear view of the first bracket of FIG. 2, and FIG. 7 is a perspective view of the first bracket of FIG. 5 to 7, the first bracket 150 may be implemented in a disk (disc) shape to block one end of the cylindrical portion 120. A guide pin hole 162 and a fastening member inserting part (corresponding to) the guide pin hole 122 and the fastening member inserting part 124 provided in the cylindrical part 120 in the rim area of the first bracket 150 ( 164) may be formed through each. The first bracket 150 may be provided with a plurality of communication portions 152 through the plate surface so that the inside and outside can communicate. The communication portion 152 may have, for example, an arc shape.

The rotating shaft 255 may be configured to be rotationally driven by external force. A rotating shaft hole may be formed through the first bracket 150 so that the rotating shaft 255 can be inserted and coupled. The rotating shaft 255 is configured to extend outside the first bracket 150. A driven pulley 257 to which the belt 258 coupled to the driving pulley 256 is coupled may be coupled to the rotating shaft 255. The inner surface of the first bracket 150 may be provided with a bearing coupling portion 155 in which a bearing rotatably supporting the rotating shaft 255 is accommodated. A plurality of bearings 160 along the axial direction may be accommodated in the interior of the bearing coupling portion 155 of the first bracket 150. Thereby, the lateral load of the rotating shaft 255 acting in the lateral direction by the tension of the belt 258 can be effectively supported.

The bearing 160 includes, for example, an inner ring 163, a plurality of outer rings 161 disposed concentrically on the outside of the inner ring 163, and a plurality of provided between the inner ring 163 and the outer ring 161. It may be configured by having a rolling member 165 (for example, a ball). The inner ring 163 may be coupled to the rotating shaft 255 by a press method. The outer ring 161 may be coupled to the inside of the bearing engaging portion 155 by a method such as press fitting.

A bearing ventilation portion 331 may be formed in the bearing coupling portion 155 of the first bracket 150 to allow air to flow in. The bearing ventilation portion 331 may be configured to be recessed along the radial direction on the inner surface of the bearing coupling portion 155 and extend along the axial direction.

The bearing ventilation part 331 may be composed of a plurality of spaced apart from each other along the circumferential direction of the bearing coupling part 155. The bearing ventilation part 331 is, for example, a first bearing ventilation part 332a disposed toward the driving pulley 256, and a second spaced apart circumferentially from the first bearing ventilation part 332a. It is provided with a bearing ventilation portion 332b, a third bearing ventilation portion 332c and a fourth bearing ventilation portion 332d. In this embodiment, the case where the bearing ventilation part 331 is composed of four is illustrated, but this is only an example, and the number can be appropriately adjusted.

The bearing coupling portion 155 increases in thickness on the outside of the bearing ventilation portion 331 disposed on the drive pulley 256 side of the bearing coupling portion 155 along the direction in which the tension of the belt 258 is applied. It is provided with a reinforcing portion 157 is formed. In this embodiment, the bearing ventilation portion 331 (first bearing ventilation portion 332a) disposed on the driving pulley 256 side is upward from the inner surface of the bearing coupling portion 155 to the driving pulley 256 side. It is formed to be recessed. Thereby, it is possible to suppress the strength of the bearing coupling portion 155 from being lowered due to the formation of the bearing ventilation portion 331. In this embodiment, it is assumed that the driving pulley 256 is disposed above the drawing of the driven pulley 257, and the case where the reinforcement part 157 is formed on the upper side of the bearing coupling part 155 is illustrated. have. One side of the reinforcing portion 157 protrudes outward between the first bearing ventilation portion 332a and the second bearing ventilation portion 332b, and the other side of the reinforcing portion 157 is the first bearing barrel. It protrudes outward between the base 332a and the fourth bearing vent portion 332d.

Of the bearing ventilation portion 331, along the direction in which the tension of the belt 258 is applied, the bearing ventilation portion 331 disposed on the driving pulley 256 side of the bearing coupling portion 155 (first bearing ventilation portion) (332a)) is formed to decrease the flow cross-sectional area along the axial direction. Accordingly, by reducing the size of the flow cross-sectional area of the bearing vent portion 332a disposed close to the driving pulley 256, it is possible to suppress a decrease in strength of the bearing coupling portion 155. More specifically, the first bearing vent portion 332a formed to be recessed toward the driving pulley 256 is formed to decrease the size of the flow cross-section of air as it approaches the driven pulley 257, so that the belt 258 Against the tension of the support strength to support the rotating shaft 255 can be effectively increased. The first bearing vent portion 332a, which is recessed toward the driving pulley 256, is formed to have a large flow cross-sectional area at the inlet side and a reduced flow cross-sectional area at the outlet side along the flow direction of air. The first bearing vent portion 332a disposed on the driving pulley 256 side may be formed to have an inclined inner surface such that the flow cross-sectional area of air is gradually reduced.

With this configuration, when the driven pulley 257 is rotated by the driving force transmitted from the driving pulley 256, the rotation shaft 255 and the rotor 250 may be rotated integrally. When the rotor 250 is rotated around the rotation axis 255, an induced electromotive force may be induced to the stator coil 231. During operation, the stator 210 and the rotor 250 may generate heat due to an exothermic action, thereby raising the temperature. When the operation is started, power is applied to the motor 291 of the blowing fan 280, and the fan unit 281 of the blowing fan 280 may be rotated by the motor 291.

When the blowing fan 280 starts rotating, air on one side of the blowing fan 280 may be moved along the axial direction. The air moved by the blowing fan 280 may pass through the second bracket 180 and be moved into the cylindrical portion 120. Some of the air moved into the interior of the cylindrical portion 120 by the blowing fan 280 flows into the air gap 240 between the stator 210 and the rotor 250, and the other portion is the vent portion. It may be introduced into (310).

The air introduced into the air gap 240 may be exchanged with the rotor 250 and the stator 210 to cool the rotor 250 and the stator 210.

The air introduced into the ventilation unit 310 may be heat exchanged with the frame 110 and the stator 210 while moving in contact with the frame ventilation unit 311 and the stator ventilation unit 321, respectively. Accordingly, cooling of the frame 110 and the stator 210 may be promoted.

On the other hand, some of the air moved to the other side of the rotor 250 through the air gap 240 and the vent portion 310 through the communication portion 152 of the first bracket 150, the first bracket 150 ). Another part of the air moved to the other side of the rotor 250 through the air gap 240 and the ventilation part 310 may be introduced into the bearing ventilation part 331. Air introduced into the bearing ventilation part 331 may cool the bearing coupling part 155 and the bearing 160, respectively, while exchanging heat with the bearing coupling part 155 and the bearing 160, respectively. Accordingly, the temperature of the bearing 160 is reduced, and the occurrence of forced deterioration of the bearing 160 due to high temperature can be suppressed.

Hereinafter, a rotating electric machine according to another embodiment of the present invention will be described with reference to FIGS. 8 to 10.

8 is a modification of the first bracket of FIG. 6, FIG. 9 is a cross-sectional view of the engaged state of FIG. 8, and FIG. 10 is a perspective view of the first bracket of FIG. As described above, the rotary electric machine of this embodiment includes a frame 110 in which an accommodation space is formed; A stator 210 disposed inside the frame 110; A rotor 250 rotatably disposed with respect to the stator 210; And a ventilation part 310 formed through the axial direction so that air may flow into the mutual contact area between the frame 110 and the stator 210.

The ventilation part 310 includes a frame ventilation part 311 that is recessed on the inner surface of the frame 110. The venting part 310 includes a stator venting part 321 that is recessed on the outer surface of the stator 210.

As shown in FIG. 8, the first bracket 150 may be provided with a bearing coupling portion 155 so that a plurality of bearings 160 can be accommodated therein. The bearing coupling portion 155 may be formed such that one side is blocked and the other side is opened. The bearing coupling portion 155 is provided with a blocking portion 156 that blocks one side of the receiving space therein. A bearing ventilation portion 331 is formed in the bearing coupling portion 155 to allow air to flow therein. The bearing ventilation portion 331 is composed of a plurality of spaced apart along the circumferential direction of the bearing coupling portion 155. In this embodiment, the bearing vent portion 331 is composed of four spaced apart at equal intervals along the circumferential direction, but is not limited thereto, and the number may be appropriately adjusted.

The bearing coupling portion 155 has a bearing ventilation portion disposed on the driving pulley 256 side in the direction in which the tension of the belt 258 coupled to the driven pulley 257 coupled to the rotating shaft 255 acts ( 331) is formed to reduce the flow cross-sectional area of air along the axial direction. The bearing vent portion 331 disposed on the driving pulley 256 side is formed to have a large flow section on the inlet side and a reduced flow section on the outlet side along the air flow direction.

Meanwhile, a recessed groove 340 is formed in the blocking portion 156 of the first bracket 150 to allow air to flow in. The groove 340 may be formed to communicate with the bearing ventilation part 331. Accordingly, air introduced into the bearing ventilation part 331 may be moved through the groove 340 to promote cooling of the bearing 160. In this embodiment, the groove 340 is composed of four corresponding to the bearing ventilation portion 331.

A rotation shaft hole 158 is formed through the blocking portion 156 of the first bracket 150 so that the rotation shaft 255 can be inserted.

A depression 350 is formed in the mutual contact area between the rotation shaft hole 158 of the first bracket 150 and the rotation shaft 255 to allow air to move. Thereby, the movement path of air may be extended inside the bearing coupling part 155. According to this configuration, the movement of air inside the bearing coupling portion 155 is promoted, and cooling of the bearing 160 can be promoted.

The depression 350 may be formed to correspond to the groove 340. The recess 350 may include a bracket recess 351a that is recessed to extend outward from the inner surface of the rotary shaft hole 158. As a result, air inside the bearing coupling portion 155 may be moved to the outside of the bearing coupling portion 155, thereby facilitating cooling of the interior of the bearing coupling portion 155. Here, two bearings 160 are inserted side by side in the axial direction so as to support the rotating shaft 255 against the tension of the belt 258 inside the bearing coupling portion 155, and the blocking portion Since the bearing 160 on the (156) side is blocked from contact with air by the blocking portion 156, cooling is insufficient, and as a result, the temperature of the bearing 160 on the blocking portion side may be further increased. The groove 340 and the recessed portion 350 promote the movement of air inside the bearing coupling portion 155, thereby reducing the internal temperature of the bearing coupling portion 155, and in particular, the blocking side bearing 160 ) Can further promote cooling.

With this configuration, when the rotating shaft 255 starts rotating and the rotor 250 is rotated, induced electromotive force is induced to the stator coil 231. The temperature of the rotor 250 and the stator 210 is increased by exothermic action. When the operation of the rotor 250 is started, the blowing fan 280 is rotationally driven by a separate power source. When the blowing fan 280 starts to rotate, air movement occurs along an axial direction, and air moved through the second bracket 180 moves through the air gap between the rotor 250 and the stator 210 ( 240) and is moved to the first bracket 150 through the ventilation portion. Accordingly, cooling of the stator 210 and the rotor 250 is promoted.

On the other hand, some of the air moved to the first bracket 150 by the blowing fan 280 is discharged to the outside of the frame 110 through the communication portion of the first bracket 150, the other part of the It flows into the bearing ventilation part 331 of the first bracket 150. The air introduced into the bearing ventilation part 331 is heat exchanged with the bearing and the bearing coupling part 155 that are contacted during movement to cool the bearing and the bearing coupling part 155. The air moved into the bearing coupling portion 155 cools the side portion of the bearing 160 disposed on the blocking portion 156 while moving along the groove 340, and the bracket depression portion 351a. Through is discharged to the outside of the bearing coupling portion (155). Thereby, an increase in temperature inside the bearing coupling portion 155 can be suppressed.

Hereinafter, a rotating electric machine according to another embodiment of the present invention will be described with reference to FIGS. 11 to 14.

FIG. 11 is a modification of the first bracket of FIG. 6, a perspective view of the first bracket of FIG. 11, FIG. 13 is a cross-sectional view of the coupling state of FIG. 11, and FIG. 14 is a perspective view of the depression of the rotating shaft of FIG. 13 to be. As described above, the rotary electric machine of this embodiment includes a frame 110 in which an accommodation space is formed; A stator 210 disposed inside the frame 110; A rotor 250 rotatably disposed with respect to the stator 210; And a ventilation part 310 formed through the axial direction so that air may flow into the mutual contact area between the frame 110 and the stator 210.

The ventilation part 310 includes a frame ventilation part 311 that is recessed on the inner surface of the frame 110. The venting part 310 includes a stator venting part 321 that is recessed on the outer surface of the stator 210.

11, a bearing ventilation portion 331 is formed in the bearing coupling portion 155 of the first bracket 150 to allow air to flow into the bearing coupling portion 155. The bearing ventilation portion 331 is composed of a plurality of spaced apart along the circumferential direction of the bearing coupling portion 155. The bearing coupling portion 155 is provided with a reinforcing portion 157 with an increased thickness protruding outward along the radial direction.

The bearing coupling portion 155 of the first bracket 150 includes a blocking portion 156 that blocks one side of the interior space. The bearing ventilation parts 331 are formed through the blocking parts 156, respectively, as shown in FIG. 12, for example. Accordingly, air introduced into each bearing vent portion 331 may be discharged to the outside of the bearing coupling portion 155. A rotating shaft hole 158 is formed through the blocking portion 156 so that the rotating shaft 255 can be inserted and coupled. The first bearing ventilation portion 332a disposed on the driving pulley 256 side of the bearing ventilation portion 331 is formed to gradually decrease the flow cross-sectional area of air along the axial direction.

On the other hand, as shown in FIG. 13, a recessed portion 350 is formed in the mutual contact area between the rotating shaft hole 158 and the rotating shaft 255 to allow air to flow therein.

The depression portion 350, for example, as shown in Figure 14, may be provided with a rotating shaft depression (351b) is formed to be recessed along the radial direction and extended in the axial direction on the outer surface of the rotating shaft (255) have. The rotary shaft depression 351b may be configured to have a length longer than the thickness of the two bearings 160 accommodated inside the bearing coupling portion 155 of the first bracket 150. Accordingly, air may be introduced and moved between the inner ring 163 of the two bearings 160 and the rotating shaft 255, thereby facilitating cooling of the two bearings 160. The bearing ventilation part 331 of the present embodiment is formed in a region in contact with the outer ring 161 of the bearing 160, and provided with a rotary shaft depression 351b in a region in contact with the inner ring 163, thereby providing the bearing By cooling the outer ring 161 and the inner ring 163 of 160 in direct contact with air, cooling of the bearing 160 may be promoted.

By this configuration, when the rotation of the rotor 250 is started, the blowing fan 280 may be rotationally driven so that cooling of the stator 210 and the rotor 250 can be promoted. When the blowing fan 280 is driven, air may be moved from the second bracket 180 side to the first bracket 150 side.

Some of the air moved to the first bracket 150 by the blowing fan 280 is discharged to the outside through the communication portion 152 of the first bracket 150.

Part of the air moved to the first bracket 150 by the blowing fan 280 is introduced into the bearing ventilation part 331 and moves while being in contact with the bearing 160 and the bearing coupling part 155 The bearing 160 and the bearing coupling portion 155 are cooled and discharged to the outside of the first bracket 150.

On the other hand, another part of the air moved to the first bracket 150 by the blowing fan 280 is introduced into the rotating shaft depression 351b formed in the rotating shaft 255 of the first bracket 150 The cooling of the two bearings 160 is promoted while moving inside the two bearings 160 coupled to the inside of the bearing coupling portion 155. Air passing through the inside of the bearing coupling portion 155 of the first bracket 150 may be moved along the rotation shaft depression 351b to be moved to the outside of the first bracket 150.

11 to 14, in the above-described embodiment, the bearing ventilation portion 331 is formed through the blocking portion 156 of the first bracket 150, and the rotating shaft recessed portion ( 351b) is illustrated, but as described above with reference to FIGS. 8 to 10, a groove 340 and a bracket depression 351a may be additionally formed on the blocking portion 156. According to this configuration, cooling of the inside of the bearing coupling portion 155 of the first bracket 150 may be further promoted.

In the above, it has been shown and described with respect to specific embodiments of the present invention. However, the present invention may be embodied in various forms without departing from its spirit or essential characteristics, and the embodiments described above should not be limited by the contents of the detailed description.

In addition, even in the embodiments not listed one by one in the above detailed description, it should be interpreted broadly within the scope of the technical spirit defined in the appended claims. In addition, all changes and modifications included in the technical scope of the claims and their equivalents should be covered by the appended claims.

Claims (16)

A frame in which an accommodation space is formed;
A stator disposed inside the frame;
A rotor rotatably disposed with respect to the stator; And
A rotating electric machine comprising a; a vent portion formed through the axial direction so that air can flow into the mutual contact area between the frame and the stator. According to claim 1,
The ventilating portion includes a rotary electric machine including a frame venting portion that is recessed on the inner surface of the frame. According to claim 1,
The ventilating portion includes a stator venting portion that is recessed on the outer surface of the stator. According to claim 3,
The stator includes a stator core in which teeth and slots are alternately formed along the circumferential direction; And a stator coil wound around each of the teeth, respectively,
The stator vent portion is a rotating electric machine, characterized in that each formed on the outer surface of the stator core corresponding to the teeth. According to claim 4,
The stator vent portion is a rotating electric machine, characterized in that each formed symmetrically with respect to the center line of the tooth. According to claim 4,
The rotating electric machine, characterized in that the depth of the stator ventilation portion is 25 to 80% of the thickness between the outer surface of the stator core and the slot. According to claim 4,
The length of the circumferential direction of the stator vent portion is 30 to 80% of the circumferential width of the tooth. According to claim 1,
The ventilating portion comprises a frame venting portion that is recessed on the inner surface of the frame and a stator venting portion that is recessed on the outer surface of the stator. The method according to any one of claims 1 to 8,
The frame, a cylindrical portion of both sides open cylindrical shape; And a first bracket and a second bracket coupled to block both ends of the cylindrical portion, respectively.
The first bracket and the second bracket are each provided with a bearing coupling portion to which the bearings rotatably supporting the rotating shaft of the rotor are respectively coupled,
A rotary electric machine characterized in that the bearing coupling portion is provided with a bearing ventilation portion to allow air to flow into the bearing coupling portion. The method of claim 9,
The bearing coupling portion is a rotating electric machine, characterized in that protruding from the inner surfaces of the first bracket and the second bracket, respectively. The method of claim 9,
The rotating shaft extends outwardly through the first bracket, and a driven pulley having one side coupled to the other side of the belt coupled to the driving pulley is provided in an area disposed outside the first bracket of the rotating shaft,
A rotating electric machine, characterized in that the bearing ventilation portion disposed on the drive pulley side of the bearing coupling portion along the direction in which the tension of the belt acts is reduced in the axial direction. The method of claim 11,
A rotating electric machine characterized in that a reinforcing portion is formed on the outer side of the bearing ventilation portion disposed on the drive pulley side of the bearing coupling portion along the direction in which the tension of the belt acts. The method of claim 11,
The bearing coupling portion of the first bracket has a blocking portion formed to block one side along the axial direction,
A rotary electric machine characterized in that a groove is recessed to allow air introduced into the bearing vent to flow into the blocking portion. The method of claim 11,
A rotating shaft hole is provided in the bearing coupling portion of the first bracket so that the rotating shaft can pass therethrough,
A rotating electric machine, characterized in that a recessed portion is provided in the mutual contact area between the rotating shaft hole and the rotating shaft to allow air to flow in. The method according to any one of claims 1 to 14,
A rotary electric machine further comprising; a blowing fan for blowing air so that air can be introduced into the ventilation part. The method of claim 15,
The blowing fan, a fan having a plurality of blades; And a motor that drives the fan to rotate.

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