JP2020188577A - Rotary electric machine - Google Patents

Abstract

To provide a rotary electric machine in which windage loss is decreased by normalizing a passage or an air flow of coolant gas to improve operating efficiency of the rotary electric machine.SOLUTION: The rotary electric machine comprises a rotor and a stator, and by rotation of the rotor, coolant gas flows from a rotor side to a stator side, and further passes through a cooler on the stator side to circulate in the machine. The rotary electric machine is arranged between a rotor winding end projected from a rotor core of the rotor in a rotor-axis direction and a stator winding end part projected from a stator core of the stator in a stator-axis direction and has in the machine a ventilation division plate having a ventilating hole which allows coolant gas passing through the rotor winding end to partially pass onto a side of the stator winding end part.SELECTED DRAWING: Figure 1

Description

An embodiment of the present invention relates to a rotary electric machine.

In general, a rotary electric machine such as a water turbine generator has a ventilation cooling structure in which cooling gas circulates in the machine. FIG. 15 shows an example of the structure of a water turbine generator having a ventilation cooling structure. As shown in FIG. 15, the turbine generator includes a constant speed generator (left side in FIG. 15) and a variable speed generator (right side in FIG. 15), each of which has a different structure. The structure of the variable speed machine will be described below.

As shown on the right side of FIG. 15, the variable speed generator is composed of a generator 100 and a water turbine 200, and the generator 100 includes a rotor 1 and a stator 2. In the rotor 1, for example, as shown in FIG. 16, a rotor winding 5 is arranged on a rotor core connected to a rotation shaft 0 via a rotor spoke, and the rotor of the rotor winding 5 is arranged. At both ends in the axial direction, there are rotor winding end portions 6 protruding from the rotor core. The rotor winding end 6 is formed in a mesh shape.

In the winding type rotor in which the rotor winding end 6 protrudes from the rotor core in this way, the rotor winding end 6 and the rotor winding are rotated as the rotor 1 is rotated by the operation of the rotary electric machine. The winding end support structure that supports the end 6 also rotates, creating a fan effect. That is, after the cooling gas on the inner diameter side of the winding end support structure flows to the outer diameter side through the winding end support structure and the rotor winding end 6, the rotor winding end 6 is cooled. It is guided to the stator 2 side to cool the stator winding end and the like. The cooling gas circulates in the machine via a cooler arranged on the stator 2 side.

Since the variable speed generator is mainly used for pumped storage power generation and also operates the electric motor by reversing the rotation, it is necessary that the structure related to the ventilation of the generator also has a structure corresponding to both forward and reverse rotation directions.

Japanese Unexamined Patent Publication No. 2013-110902 U.S. Pat. No. 2012/0068569 U.S. Patent No. 2012/0112601 U.S. Patent No. 2013/01854993 Japanese Patent No. 4299962

Various methods are known for the winding end support structure that supports the rotor winding end, but the action that the structure protruding from the rotor rotates to produce a fan effect is common to each method. ..

Although the fan effect due to the rotation of the winding end support structure is large, on the other hand, the amount of heat generated at the rotor winding end, etc. is small compared to the amount of heat generated inside the iron core, but the rotor winding end Since a cooling gas with an excessive amount of air flows, the operating efficiency of the rotary electric machine is lowered due to a large amount of wind damage.

An object to be solved by the present invention is to provide a rotary electric machine capable of reducing wind damage and improving operating efficiency by optimizing the flow path or air volume of cooling gas.

According to the embodiment, the rotor is provided with a rotor and a stator, and the cooling gas flows from the rotor side to the stator side by the rotation of the rotor and further circulates in the machine through the cooler on the stator side. Between the rotor winding end protruding from the rotor core of the rotor in the rotor axial direction and the stator winding end protruding from the stator core of the stator in the stator axial direction. Provided is a rotary electric machine provided with a ventilation partition plate provided in the machine, which is arranged and has a ventilation hole for passing a part of the cooling gas that has passed through the rotor winding end portion to the stator winding end end side.

According to the present invention, it is possible to reduce wind damage and improve the operating efficiency of a rotary electric machine by optimizing the flow path or air volume of the cooling gas.

The figure which shows an example of the schematic structure when the rotary electric machine which concerns on 1st Embodiment is seen in the circumferential direction. The figure which shows an example of the member which comprises the ventilation partition plate 17 which concerns on the same embodiment. FIG. 5 is a plan view showing a shape of the ventilation partition plate 17 according to the second embodiment as viewed from the rotor winding end 6 side. The cross-sectional view which shows the cross-sectional shape of a part of the ventilation partition plate 17 which concerns on the same embodiment. FIG. 5 is a plan view showing a shape of the ventilation partition plate 17 according to the third embodiment as viewed from the rotor winding end 6 side. The cross-sectional view which shows the cross-sectional shape of a part of the ventilation partition plate 17 which concerns on the same embodiment. FIG. 5 is a plan view showing a shape of the ventilation partition plate 17 according to the fourth embodiment as viewed from the rotor winding end 6 side. The cross-sectional view which shows the cross-sectional shape of a part of the ventilation partition plate 17 which concerns on the same embodiment. FIG. 5 is a plan view showing a shape of the ventilation partition plate 17 according to the fifth embodiment as viewed from the rotor winding end 6 side. The cross-sectional view which shows the cross-sectional shape of a part of the ventilation partition plate 17 which concerns on the same embodiment. The figure which shows an example of the schematic structure when the rotary electric machine which concerns on 6th Embodiment is seen in the circumferential direction. FIG. 5 is a plan view showing a shape of the windbreak plate 23 according to the same embodiment as viewed from the rotor winding end 6 side (or the winding end support structure 24 side). The figure which shows an example of the schematic structure when the rotary electric machine which concerns on 7th Embodiment is seen in the circumferential direction. FIG. 5 is a plan view showing a shape of the windbreak plate 23 according to the same embodiment as viewed from the rotor winding end 6 side (or the winding end support structure 24 side). The figure which shows an example of the structure of the water turbine generator (the variable speed machine among the constant speed machine and the variable speed machine) which has a ventilation cooling structure. The figure which shows the schematic structure of the rotor 1 in a variable speed machine.

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

(First Embodiment)
First, the first embodiment will be described with reference to FIGS. 1 and 2.

FIG. 1 is a diagram showing an example of a schematic configuration when the rotary electric machine according to the first embodiment is viewed in the circumferential direction. In FIG. 1, the same reference numerals are given to the elements common to those in FIGS. 15 and 16 described above.

The rotary electric machine shown in FIG. 1 is roughly classified into a rotor 1 coupled to a main shaft, which is a rotary shaft, and a stator 2.

The rotor 1 includes a rotor core 4 connected to a rotation shaft via rotor spokes 3. The outer peripheral surface of the rotor core 4 is provided with a plurality of grooves formed in the rotor axial direction for embedding the rotor winding 5, and a plurality of rotor windings embedded in the plurality of grooves. 5 is fixed by a wedge (not shown). Further, at the end of the rotor winding 5 in the rotor axial direction, there is a rotor winding end 6 protruding from the rotor core 4.

The winding end support structure 24 includes a support ring support portion 12, a support ring 13, a U bolt 7, and the like, and fixes a rotor winding end portion 6 projecting from the rotor core 4 in the rotor axial direction. .. Specifically, support ring support portions 12 are provided on the inner peripheral side of the rotor winding end portion 6 protruding from the rotor core 4 in the rotor axial direction at intervals in the circumferential direction, and the rotor winding is provided. A plurality of support rings 13 are laminated in the rotor axial direction between the end portion 6 and the support ring support portion 12. From the outer peripheral side of the winding end portion 6, for example, a U-bolt 7 forming a U shape inserts the rotor winding end portion 6 together with the support ring 13, and is shown on the inner diameter side of the support ring 13. It is fixed with a nut or the like.

In this way, the rotor winding end 6 is fixed to the support ring 13 by the U bolt 7, and the inner diameter side of the support ring 13 is fixed to the end of the rotor core 4 over the circumferential direction of the rotation shaft. Since it is fixed to 12, the rotor winding end 6 has a resistance to the centrifugal force acting when the rotor 1 rotates.

The stator 2 has a stator core 9 supported by a stator frame 8. The inner peripheral surface of the stator core 9 is provided with a plurality of grooves formed in the stator axial direction for embedding the stator winding 10, and a plurality of stator windings embedded in the plurality of grooves. The line 10 is fixed by a wedge (not shown). The stator frame 8 is connected to a windbreak plate 23 provided so as to face the rotor winding end 6 in the rotor axial direction. Further, at the end of the stator winding 10 in the stator axial direction, there is a stator winding end 11 protruding from the stator core 9.

In particular, in the present embodiment, a cylindrical ventilation partition plate 17 for partitioning the space where the rotor winding end 6 is arranged and the space where the stator winding end 11 is arranged is provided in the machine. Specifically, the ventilation partition plate 17 is arranged between the rotor winding end 6 and the stator winding end 11 so as not to come into contact with the rotor winding end 6, for example, the upper end is fixed. It is attached to the child frame 8 and its lower end is attached to and fixed to the support member of the stator core 9. The ventilation partition plate 17 has a plurality of ventilation holes 18 for passing a part of the cooling gas that has passed through the winding end support structure 24 and the rotor winding end 6 toward the stator winding end 11 side.

FIG. 2 shows an example of a member constituting the ventilation partition plate 17. In the example of FIG. 2, only a part of the ventilation partition plate 17 having a cylindrical shape is illustrated. By combining a plurality of such members, a cylindrical ventilation partition plate 17 is configured. Note that FIG. 2 shows an example, and the present invention is not limited to this. For example, the cylindrical ventilation partition plate 17 may be realized with only one member.

As shown in FIG. 2, the individual ventilation holes 18 provided in the ventilation partition plate 17 are arranged so as to be arranged, for example, in the stator axial direction and the circumferential direction. The ventilation partition plate 17 causes a pressure loss for the cooling gas flowing through the winding end support structure 24 and the rotor winding end 6, and also causes a plurality of ventilation holes 18 of the ventilation partition plate 17. A pressure loss is also generated in the cooling gas passing through the ventilation hole 18, and the flow of the cooling gas passing through the ventilation hole 18 is suppressed. The pressure loss and the flow rate of the cooling gas passing through the plurality of ventilation holes 18 depend on the total opening area (or aperture ratio) of the ventilation holes 18. Therefore, for example, by appropriately adjusting the size and number of the ventilation holes 18, a desired pressure loss and flow rate can be achieved.

In the operating state of the rotary electric machine, the rotor winding 5 and the stator winding 10 provided on the rotor 1 and the stator 2 are energized and heated by Joule heat. Further, the rotor core 4 and the stator core 9 generate heat. The rotor winding 5 and the stator winding 10 are insulated, but since the temperature upper limit of the insulating material is strictly set, the high temperature cooling gas is cooled by the cooler 15 provided in the machine. It exchanges heat with water to lower the temperature and circulates cooling gas to cool the inside of the machine.

Reference numerals A, B, C, and D in FIG. 1 represent flow paths of cooling gas that circulates in the machine of the rotary electric machine and cools each part.

When the rotor 1 rotates, the flow path A through which the cooling gas flows is formed due to the fan effect caused by the rotation of the rotor 1. That is, the cooling gas cooled by the cooler 15 is guided to the inside of the rotor spokes 3 of the rotor 1 and flows into the rotor core 4 to cool the rotor core 4 and the rotor winding 5. After being guided by the air gap 16 formed by the rotor 1 and the stator 2, it flows into the stator core 9 and cools the stator core 9 and the stator winding 10 to reach the cooler 15. , Circulates in the cabin.

Further, as the rotor 1 rotates, the cooling gas on the inner diameter side of the winding end support structure 24 flows through the rotor winding end 6 due to the fan effect of the winding end support structure 24. After cooling the rotor winding end portion 6, it flows out to the outer diameter side thereof. The outflowing cooling gas flows into the ventilation hole 18 of the ventilation partition plate 17, and also passes through the gap between the rotor winding end 6 and the windbreak plate 23 without flowing into the ventilation hole 18. Some return to the inner diameter side of the winding end support structure 24, and some are guided to the air gap 16 between the rotor core 4 and the stator core 9.

The cooling gas that has passed through the ventilation holes 18 of the ventilation partition plate 17 forms the flow path B. That is, the cooling gas that has passed through the ventilation hole 18 of the ventilation partition plate 17 passes through the stator winding end 11 on the stator 2 side and reaches the cooler 15 arranged on the stator side. The cooling gas that has exchanged heat through the cooler 15 joins the flow path A.

In the ventilation partition plate 17, the opening ratio of the ventilation hole 18 is set in advance so that the flow rate of the cooling gas flowing through the flow path B becomes a predetermined appropriate value. Therefore, the flow rate of the cooling gas flowing through the flow path B does not become more than necessary, and becomes an appropriate flow rate.

By providing the ventilation partition plate 17 provided with the plurality of ventilation holes 18 in this way, it is possible to reduce the flow rate of the cooling gas flowing through the flow path B and prevent the cooling gas from flowing excessively through the flow path B. The wind damage generated at the stator winding end 11 can be reduced, and as a result, the flow rate of the cooling gas flowing through the winding end support structure 24 and the rotor winding end 6 can be reduced. This makes it possible to reduce wind damage generated at the winding end support structure 24 and the rotor winding end 6.

For example, a part of the cooling gas that has passed through the winding end support structure 24 and the rotor winding end 6 does not flow through the flow path B (that is, without being cooled by the cooler 15), and the rotor is not cooled. A flow that returns to the inner diameter side of the winding end support structure 24 through the gap between the winding end 6 and the windbreak plate 23, and circulates again through the winding end support structure 24 and the rotor winding end 6. A path C may be formed, or a flow path D that joins the flow path A may be formed. However, in the present embodiment, the formation of the flow path C and the formation of the flow path D are suppressed by arranging the ventilation partition plate 17 between the rotor winding end portion 6 and the stator winding end portion 11. ..

Specifically, by arranging the ventilation partition plate 17 between the rotor winding end 6 and the stator winding end 11, the winding end support structure 24 and the rotor winding end 6 are provided. The passed cooling gas hits the ventilation partition plate 17, and at that time, a certain pressure loss is caused for the cooling gas. As a result, of the cooling gas that has passed through the winding end support structure 24 and the rotor winding end 6, the winding end passes through the gap between the rotor winding end 6 and the windbreak plate 23 through the flow path C. The flow rate of the cooling gas flowing to the inner diameter side of the part support structure 24 and the flow rate of the cooling gas flowing from the inner diameter side of the winding end support structure 24 through the winding end support structure 24 and the rotor winding end 6 are The wind loss generated at the winding end support structure 24 and the rotor winding end 6 is reduced. Further, since the flow rate of the cooling gas (cooling gas that has not been cooled by the cooler 15) that joins the cooling gas of the flow path A through the flow path D also decreases, the high-temperature cooling gas is introduced to the inside of the rotor spoke 3. It is also suppressed that the rotor winding 5 is overheated by being guided by.

According to the first embodiment, by arranging the ventilation partition plate 17 between the rotor winding end 6 and the stator winding end 11, the flow rate of the cooling gas flowing through the flow path B is reduced. Therefore, the wind damage generated at the stator winding end 11 can be reduced, and the flow rate of the cooling gas flowing through the flow path C can be reduced. Therefore, the winding end support structure 24 can be used. And since the wind damage generated at the rotor winding end 6 can be reduced and the flow rate of the cooling gas flowing through the flow path D can be reduced, the high temperature cooling gas is inside the rotor spoke 3. It is also possible to prevent the rotor winding 5 from being overheated by being guided by. As a result, it becomes possible to improve the operating efficiency of the rotary electric machine.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. 3 and 4.

In the following, the description of the parts common to the first embodiment will be omitted, and the parts different from the first embodiment will be mainly described. Further, each figure referred to in the first embodiment is also referred to as appropriate in the second embodiment.

The difference between the second embodiment and the first embodiment is that the ventilation partition plate 17 has a plurality of swirl breakers (swivel flow prevention portions) on the surface on the rotor winding end 6 side to cancel the swirling flow of the cooling gas. ) 19 is provided.

FIG. 3 is a plan view showing the shape of the ventilation partition plate 17 according to the second embodiment as viewed from the rotor winding end 6 side. Further, FIG. 4 is a cross-sectional view showing a partial cross-sectional shape of the ventilation partition plate 17 according to the same embodiment. The arrow R in FIGS. 3 and 4 represents the rotation direction of the rotor 1.

The swirl breaker 19 provided in the ventilation partition plate 17 is, for example, a cylindrical member arranged so as to surround the inlet side of each ventilation hole 18 on the surface of the ventilation partition plate 17 on the rotor winding end 6 side. , The swirling flow of the cooling gas generated by the rotation of the rotor winding end 6 is canceled.

In the operating state of the rotary electric machine configured in this way, the cooling gas passing through the winding end support structure 24 and the rotor winding end 6 is swirled by the rotation of the rotor 1 in the R direction. It flows out toward the ventilation partition plate 17. At that time, since the cooling gas is swirling, a part of the cooling gas collides with the swirl breaker 19 on the way to the ventilation hole 18. Therefore, the flow of the cooling gas toward the ventilation hole 18 is blocked, and the pressure loss of the cooling gas is increased on the surface of the ventilation partition plate 17 on the rotor winding end 6 side as compared with the case without the swirl breaker 19. Occur.

As a result, of the cooling gas that has passed through the winding end support structure 24 and the rotor winding end 6, the winding end passes through the gap between the rotor winding end 6 and the windbreak plate 23 through the flow path C. The flow rate of the cooling gas flowing to the inner diameter side of the part support structure 24 and the flow rate of the cooling gas flowing from the inner diameter side of the winding end support structure 24 through the winding end support structure 24 and the rotor winding end 6 are The wind damage generated at the winding end support structure 24 and the rotor winding end 6 is further reduced. Further, since the flow rate of the cooling gas (cooling gas that has not been cooled by the cooler 15) that joins the cooling gas of the flow path A through the flow path D is further reduced, the high-temperature cooling gas is generated by the rotor spokes 3. It is further suppressed that the rotor winding 5 is guided to the inside of the rotor and is overheated.

According to the second embodiment, in addition to obtaining the same effect as that of the first embodiment, the flow rate of the cooling gas flowing through the flow path C due to the pressure loss of the cooling gas generated on the inlet side of the ventilation hole 18. Can be further reduced, so that the wind damage generated at the winding end support structure 24 and the rotor winding end 6 can be further reduced, and the flow rate of the cooling gas flowing through the flow path D can be further reduced. Can be further reduced, so that it is possible to further prevent the rotor winding 5 from being overheated due to the high-temperature cooling gas being guided to the inside of the rotor spokes 3. This makes it possible to further improve the operating efficiency of the rotary electric machine.

(Third Embodiment)
Next, a third embodiment will be described with reference to FIGS. 5 and 6.

In the following, the description of the parts common to the second embodiment will be omitted, and the parts different from the second embodiment will be mainly described. Further, the figures referred to in the first and second embodiments are also referred to as appropriate in the third embodiment.

The difference between the third embodiment and the second embodiment is that the swirl breaker 19'provided on the ventilation partition plate 17 is not arranged in a cylindrical shape so as to surround the individual ventilation holes 18, but is ventilated. The point is that the partition plate 17 is arranged so as to extend in the stator axial direction on the surface of the rotor winding end 6 side.

FIG. 5 is a plan view showing the shape of the ventilation partition plate 17 according to the third embodiment as viewed from the rotor winding end 6 side. Further, FIG. 6 is a cross-sectional view showing a partial cross-sectional shape of the ventilation partition plate 17 according to the same embodiment. The arrow R in FIGS. 5 and 6 indicates the rotation direction of the rotor 1.

The swirl breaker 19'provided on the ventilation partition plate 17 is, for example, a plate-shaped member arranged in parallel at a certain distance on the surface of the ventilation partition plate 17 on the rotor winding end 6 side. Each swirl breaker 19'cancels the swirling flow of cooling gas generated with the rotation of the rotor winding end 6.

In the operating state of the rotary electric machine configured in this way, the cooling gas that has passed through the winding end support structure 24 and the rotor winding end 6 is swirled by the rotation of the rotor 1 in the R direction. It flows out toward the ventilation partition plate 17. At that time, since the cooling gas is swirling, a part of the cooling gas collides with the swirl breaker 19'on the way to the ventilation hole 18. Therefore, the flow of the cooling gas toward the ventilation hole 18 is blocked, and the pressure loss of the cooling gas on the surface of the ventilation partition plate 17 on the rotor winding end 6 side as compared with the case without the swirl breaker 19'. Occurs.

As a result, of the cooling gas that has passed through the winding end support structure 24 and the rotor winding end 6, the winding end passes through the gap between the rotor winding end 6 and the windbreak plate 23 through the flow path C. The flow rate of the cooling gas flowing to the rotor inner diameter side of the part support structure 24, and the cooling flowing from the rotor inner diameter side of the winding end support structure 24 through the winding end support structure 24 and the rotor winding end 6. The flow rate of the gas is further reduced, and the wind damage generated at the winding end support structure 24 and the rotor winding end 6 is further reduced. Further, since the flow rate of the cooling gas (cooling gas that has not been cooled by the cooler 15) that joins the cooling gas of the flow path A through the flow path D is further reduced, the high-temperature cooling gas is generated by the rotor spokes 3. It is further suppressed that the rotor winding 5 is guided to the inside of the rotor and is overheated.

According to the third embodiment, in addition to obtaining the same effect as that of the second embodiment, the structure of the swirl breaker 19'is simple, so that the production can be prepared. Further, since the swirl breaker 19'also has a function as a member for increasing the strength of the ventilation partition plate 17, it is possible to provide a more reliable rotary electric machine.

(Fourth Embodiment)
Next, a fourth embodiment will be described with reference to FIGS. 7 and 8.

In the following, the description of the parts common to the third embodiment will be omitted, and the parts different from the third embodiment will be mainly described. Further, each figure referred to in the first to third embodiments is also referred to as appropriate in the fourth embodiment.

The fourth embodiment differs from the third embodiment in that the ventilation partition plate 17 makes the mounting angle of the swirl breaker 19'variable with respect to the surface of the ventilation partition plate 17 on the rotor winding end 6 side. The point is that the angle variable mechanism 22 is further provided.

FIG. 7 is a plan view showing the shape of the ventilation partition plate 17 according to the fourth embodiment as viewed from the rotor winding end 6 side. Further, FIG. 8 is a cross-sectional view showing a partial cross-sectional shape of the ventilation partition plate 17 according to the same embodiment. The arrow R in FIGS. 7 and 8 represents the rotation direction of the rotor 1.

The swirl breaker 19'provided on the ventilation partition plate 17 includes, for example, an angle variable mechanism 22 such as a rotatable hinge that makes it possible to change the mounting angle of the ventilation partition plate 17 with respect to the surface of the rotor winding end 6 side. ing.

The angle variable mechanism 22 includes a tightening member such as a bolt that rotatably tightens the swirl breaker 19'to the ventilation partition plate 17. For example, by loosening the tightening member, the swirl breaker 19'is on the surface of the ventilation partition plate 17. The swirl breaker 19'can be rotated within a predetermined range, and the swirl breaker 19'is fixed so as not to move with respect to the wind pressure of the cooling gas by tightening the tightening member at an arbitrary mounting angle. be able to.

In such a configuration, for example, when the swirl breaker 19'is tilted toward the rotating R direction side (rotation direction advancing side) of the rotor 1, the cooling gas that collides with the swirl breaker 19'flows toward the ventilation hole 18. Since it is induced, the cooling gas easily flows into the ventilation hole 18, and the pressure loss of the cooling gas on the inlet side of the ventilation hole 18 is reduced. On the other hand, when the rotor 1 is tilted to the opposite side of the rotating R direction (delayed side in the rotation direction), the flow of the cooling gas is directed in the direction away from the ventilation hole 18, so that the cooling gas on the inlet side of the ventilation hole 18 Pressure loss increases.

Since the mounting angle of the swirl breaker 19'is variable in this way, the pressure loss of the cooling gas on the inlet side of the ventilation hole 18 can be changed, and the flow rate of the cooling gas flowing through the above-mentioned flow path B can be changed. Can be done.

According to the fourth embodiment, in addition to obtaining the same effect as that of the third embodiment, the angle variable mechanism 22 makes the mounting angle of the swirl breaker 19'variable on the inlet side of the ventilation hole 18. Since the pressure loss of the cooling gas can be adjusted, the flow rate of the cooling gas flow path B can be minimized, and the wind damage generated at the rotor winding end 6 can be suppressed to improve the operating efficiency. It is possible to provide a high-speed rotary electric machine.

(Fifth Embodiment)
Next, a fifth embodiment will be described with reference to FIGS. 9 and 10.

In the following, the description of the parts common to the fourth embodiment will be omitted, and the parts different from the fourth embodiment will be mainly described. In addition, the figures referred to in the first to fourth embodiments are also referred to in the fifth embodiment as appropriate.

The fifth embodiment differs from the fourth embodiment in that the ventilation partition plate 17 causes the outflow of cooling gas passing through the ventilation hole 18 to the surface of the ventilation partition plate 17 on the stator winding end 11 side. It also has a mechanism to determine the direction.

FIG. 9 is a plan view showing the shape of the ventilation partition plate 17 according to the fifth embodiment as viewed from the rotor winding end 6 side. Further, FIG. 10 is a cross-sectional view showing a partial cross-sectional shape of the ventilation partition plate 17 according to the same embodiment. The arrow R in FIGS. 9 and 10 indicates the rotation direction of the rotor 1.

The outflow direction adjusting mechanism 22'provided on the ventilation partition plate 17 is, for example, a cylindrical member arranged so as to surround the outlet side of each ventilation hole 18 on the surface of the stator winding end 11 side, and is a ventilation member. The outflow direction of the cooling gas passing through the hole 18 is determined. The outflow direction of the cooling gas in each ventilation hole 18 may be set so as to uniformly face the normal direction of the surface of the ventilation partition plate 17, but the present invention is not limited to this, and for example, the cooling gas passing through each ventilation hole 18 may be set. The outflow direction of the cooling gas may be set to be different for each ventilation hole 18 so that the outflow is directed to a desired portion of the stator winding end portion 11. Further, a variable mechanism may be further provided for each ventilation hole 18 to change the outflow direction of the cooling gas.

In the operating state of the rotary electric machine, the stator winding end portion 11 generates a large amount of heat generated closer to the stator core 9 due to the influence of the leakage magnetic flux at the rotary electric machine end portion. The outflow direction adjusting mechanism 22'cools the stator winding end 11 by causing the cooling gas flowing out from each ventilation hole 18 to flow out toward the portion where the stator winding end 11 generates a large amount of heat, for example.

According to the fifth embodiment, in addition to obtaining the same effect as that of the fourth embodiment, the cooling gas is intensively supplied to the stator winding end portion 11 by the outflow direction adjusting mechanism 22'. Therefore, the stator winding end portion 11 can be cooled more efficiently, and a rotary electric machine having higher operating efficiency can be provided.

(Sixth Embodiment)
Next, a sixth embodiment will be described with reference to FIGS. 11 and 12.

In the following, the description of the parts common to the first embodiment will be omitted, and the parts different from the first embodiment will be mainly described. In addition, each figure referred to in the first embodiment is also referred to as appropriate in the sixth embodiment.

The sixth embodiment differs from the first embodiment in that the windbreak plate 23 causes a swirling flow of cooling gas on the surface of the rotor winding end 6 side (or the winding end support structure 24 side). The point is that it is provided with a plurality of swirl breakers (swirl flow prevention portions) 20 for canceling.

FIG. 11 is a diagram showing an example of a schematic configuration when the rotary electric machine according to the sixth embodiment is viewed in the circumferential direction. Further, FIG. 12 is a plan view showing the shape of the windbreak plate 23 according to the same embodiment as viewed from the rotor winding end portion 6 side (or the winding end portion supporting structure 24 side).

The swirl breakers 20 provided in the windbreak plate 23 are arranged in parallel at a certain distance in the rotor circumferential direction on the surface of the ventilation partition plate 17 on the rotor winding end 6 side, for example, and each of them has a rotor diameter. It is a plurality of plate-shaped members arranged radially so as to extend in a direction. In each swirl breaker 20, cooling gas passes from the outer diameter side of the winding end support structure 24 through the gap between the rotor winding end 6 and the windbreak plate 23, and the rotor inner diameter side of the winding end support structure 24. When flowing to, the swirling flow of the cooling gas generated with the rotation of the rotor winding end 6 is canceled.

In the operating state of the rotary electric machine configured in this way, the cooling gas that has passed through the winding end support structure 24 and the rotor winding end 6 is the rotor winding end 6 and the windbreak plate 23. It flows to the rotor inner diameter side of the winding end support structure 24 through the gap, but at that time, since the cooling gas is swirling, a part of it flows to the rotor inner diameter side of the winding end support structure 24. It collides with the swirl breaker 20 on the way to the side. Therefore, the flow of the cooling gas is blocked, and a pressure loss of the cooling gas occurs on the surface of the ventilation partition plate 17 on the rotor winding end 6 side as compared with the case without the swirl breaker 20. As a result, the flow rate of the cooling gas flowing through the flow path C and the flow path D is reduced.

According to the sixth embodiment, in addition to obtaining the same effect as that of the first embodiment, the pressure loss of the cooling gas generated by the swirl breaker 20 further increases the flow rate of the cooling gas flowing through the flow path C. Since it can be reduced, the wind damage generated in the winding end support structure 24 and the rotor winding end 6 can be further reduced, and the flow rate of the cooling gas flowing through the flow path D can be further reduced. Since it can be reduced, it is possible to further suppress that the high temperature cooling gas is guided to the inside of the rotor spokes 3 and the rotor winding 5 is overheated. This makes it possible to further improve the operating efficiency of the rotary electric machine.

(7th Embodiment)
Next, a seventh embodiment will be described with reference to FIGS. 13 and 14.

In the following, the description of the parts common to the sixth embodiment will be omitted, and the parts different from the sixth embodiment will be mainly described. Further, each figure referred to in the sixth embodiment is also referred to as appropriate in the seventh embodiment.

The seventh embodiment differs from the sixth embodiment in that, in addition to the plurality of swirl breakers 20, a plurality of partition plates 21 that prevent the cooling gas from flowing in the rotor radial direction along the windbreak plate 23. It is in the point that it has.

FIG. 13 is a diagram showing an example of a schematic configuration when the rotary electric machine according to the seventh embodiment is viewed in the circumferential direction. Further, FIG. 14 is a plan view showing the shape of the windbreak plate 23 according to the same embodiment as viewed from the rotor winding end portion 6 side (or the winding end portion supporting structure 24 side).

The partition plate 21 provided on the windbreak plate 23 is arranged in an arc shape so as to extend in the rotor circumferential direction on the surface of the windbreak plate 23 on the rotor winding end side (or winding end support structure 24 side). It is a plate-shaped member, and prevents the cooling gas from flowing to the partition plate 21 along the windbreak plate 23 over a plurality of stages.

In the operating state of the rotary electric machine configured in this way, the cooling gas that has passed through the winding end support structure 24 and the rotor winding end 6 is the rotor winding end 6 and the windbreak plate 23. It flows to the rotor inner diameter side of the winding end support structure 24 through the gap, but at that time, since the cooling gas is swirling, a part of it flows to the rotor inner diameter side of the winding end support structure 24. It collides with the swirl breaker 20 on the way to the side, and the partition plate 21 further obstructs the flow toward the partition plate 21. Therefore, a large action of blocking the flow of the cooling gas occurs, and a larger pressure loss occurs on the surface of the ventilation partition plate 17 on the rotor winding end 6 side as compared with the case without the swirl breaker 20. As a result, the flow rate of the cooling gas flowing through the flow path C and the flow path D is further reduced.

According to the seventh embodiment, in addition to obtaining the same effect as that of the sixth embodiment, the flow rate of the cooling gas flowing through the flow path C due to the larger pressure loss generated by the swirl breaker 20 and the partition plate 21. Can be further reduced, so that the wind damage generated at the winding end support structure 24 and the rotor winding end 6 can be further reduced, and the flow rate of the cooling gas flowing through the flow path D can be further reduced. Can be further reduced, so that it is possible to further prevent the rotor winding 5 from being overheated due to the high-temperature cooling gas being guided to the inside of the rotor spokes 3. This makes it possible to further improve the operating efficiency of the rotary electric machine.

As described in detail above, according to at least one of the embodiments, it is possible to reduce the wind damage and improve the operating efficiency of the rotary electric machine by optimizing the flow path or the air volume of the cooling gas.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... Rotor, 2 ... Stator, 3 ... Rotor spoke, 4 ... Rotor iron core, 5 ... Rotor winding, 6 ... Rotor winding end, 7 ... U bolt, 8 ... Stator frame, 9 ... Stator iron core, 10 ... Stator winding, 11 ... Stator winding end, 12 ... Support ring support, 13 ... Support ring, 14 ... Saddle, 15 ... Cooler, 16 ... Air gap, 17 ... Ventilation Partition plate, 18 ... Ventilation hole, 19, 19', 20 ... Swirl breaker, 21 ... Partition plate, 22 ... Angle variable mechanism, 22'... Outflow direction adjustment mechanism, 23 ... Windbreak plate, 24 ... Winding end support structure ..

Claims (9)

A rotary electric machine having a rotor and a stator, in which cooling gas flows from the rotor side to the stator side due to the rotation of the rotor and further circulates in the machine through a cooler on the stator side.
It is arranged between the rotor winding end portion protruding from the rotor core of the rotor in the rotor axial direction and the stator winding end portion protruding from the stator core of the stator in the stator axial direction. A rotary electric machine provided with a ventilation partition plate having a ventilation hole for passing a part of the cooling gas that has passed through the end of the rotor winding to the end of the stator winding. The rotary electric machine according to claim 1, further comprising a first swirl breaker provided on a surface of the ventilation partition plate on the end side of the rotor winding and canceling the swirling flow of cooling gas. The rotary electric machine according to claim 2, wherein the first swirl breaker is a cylindrical member arranged so as to surround the ventilation holes on the surface of the ventilation partition plate on the rotor winding end side. The first swirl breaker is a plurality of plate-shaped members arranged so as to extend in the stator axial direction on the surface of the ventilation partition plate on the rotor winding end side, according to claim 2. Rotating electric machine. The fourth aspect of the present invention, wherein the ventilation partition plate includes an angle variable mechanism that enables the mounting angle of the first swirl breaker to be changed with respect to the surface of the ventilation partition plate on the rotor winding end side. Rotating electric machine. The rotation according to any one of claims 1 to 5, further provided with an outflow direction adjusting mechanism provided on the surface of the ventilation partition plate on the stator side and determining the outflow direction of the cooling gas passing through the ventilation holes. Electric. A swirling flow of cooling gas provided on the surface of a windbreak plate provided so as to face the rotor winding end portion in the rotor axial direction and passing between the windbreak plate and the rotor winding end portion. The rotary electric machine according to any one of claims 1 to 6, further comprising a second swirl breaker for canceling. The rotary electric machine according to claim 7, wherein the second swirl breaker is a plurality of plate-shaped members arranged so as to extend in the rotor radial direction on the surface of the windbreak plate on the rotor side. Further, a partition plate which is arranged so as to extend in the rotor circumferential direction on the surface of the windbreak plate on the end side of the rotor winding and prevents cooling gas from flowing in the rotor radial direction along the windbreak plate. The rotary electric machine according to claim 8.