JP4857874B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotary electric machine, and more particularly, to a rotary electric machine suitable for one in which a cooler is arranged in a ventilation path through which a cooling medium for cooling the inside of the machine flows.

As an example of a rotating electrical machine provided with a cooler for cooling a cooling medium, for example, International Publication No. 01 /
One described in the pamphlet of No. 018943 is known.

  In the rotating electrical machine described in this publication, a cooler and a ventilation path are provided above or below the rotating electrical machine, and a cooling medium whose temperature is increased by heat generation in the rotating electrical machine is guided to the cooler via the ventilation path and cooled. is doing.

  In a rotating electrical machine having a cooler, a ventilation path plays a role of connecting between ventilation sections in the machine in order to circulate the cooling medium in the machine, and the cooling medium circulates in a radial direction and a circumferential direction in the ventilation section.

  By the way, if there is a part in the rotating electrical machine where the flow of the cooling medium is hindered, the part may become locally hot and may be damaged. Therefore, it is necessary to arrange the ventilation path and the cooler so as not to disturb the flow of the cooling medium in the ventilation section.

  16 and 17 show a rotating electrical machine in which a cooling device and a ventilation path are provided below the rotating electrical machine as an example in which the ventilation path and the cooling device are arranged so as not to disturb the flow of the cooling medium in the ventilation section.

  In the figure, reference numeral 1 denotes a stator frame. A rotor core (not shown) provided with a rotor winding is disposed in the stator frame 1, and the rotor core is opposed to the rotor core via an air gap. In addition, a plurality of ventilation ducts are provided in the radial direction, and the stator core 2 on which the stator winding is applied is accommodated. Then, a cooling medium is enclosed in the stator frame 1 and flows into the stator core 2 and the rotor core, which are heat sources, and the cooling medium heated by cooling the stator core 2 and the rotor core, etc. After cooling by the cooler 3 provided in three places in the axial direction in the stator frame 1 below the stator core 2 below the rotating electric machine, the air passes through the ventilation path 5 provided in the base pit 4. It is sent again to the stator core 2 and the rotor core.

International Publication No. 01/018943 Pamphlet

  However, when the cooler 3 and the ventilation path 5 are provided below the rotating electrical machine as described above, the height from the lower end of the rotating electrical machine to the shaft center 6 is increased. In particular, when the height from the lower end of the rotating electrical machine to the shaft center 6 is higher than the height of the connecting portion with the prime mover connected to the rotational shaft or the rotating body driven by the rotating electrical machine, It is necessary to take measures such as adjusting the height or digging down the location where the rotating electrical machine is installed.

  On the other hand, when the cooler 3 is installed above the rotating electrical machine, the height from the lower end of the rotating electrical machine to the shaft center 6 does not increase, but a cooler cover or the like covering the cooler 3 is necessary, and the total height of the rotating electrical machine is increased. In some cases, the weight of a cooler cover or the like may increase.

  The total height and weight of the rotating electric machine are preferably as small and as light as possible because they are related to restrictions on installation locations and transportation.

  The present invention has been made in view of the above points, and the object of the present invention is to arrange the cooler without increasing the height and the total height from the lower end of the rotating electrical machine to the center of the shaft while maintaining the cooling capacity, It is to provide a rotating electric machine that is small and light.

  In the present invention, in order to achieve the above object, a rotor core provided with a rotor winding, and the rotor core are arranged to face each other via an air gap, extend in the radial direction, and have a predetermined interval in the axial direction. A stator core provided with a plurality of ventilation ducts and provided with stator windings, a stator frame for storing these, and a partition plate provided between the stator frame and the stator core in the axial direction A plurality of divided ventilation sections, a cooling medium that circulates in the stator frame and cools the inside of the machine, a cooler that is provided in the flow path of the cooling medium and cools the cooling medium, and the ventilation section And a plurality of the coolers are arranged in the circumferential direction at the same position in the axial direction.

  According to the present invention, it is possible to obtain a rotating electrical machine that is reduced in size and weight by arranging a cooler without increasing the height and the total height from the lower end of the rotating electrical machine to the center of the shaft while maintaining the cooling capacity of the rotating electrical machine. .

  With the aim of providing a rotating electrical machine that is smaller and lighter by providing a cooler without increasing the height and overall height from the lower end of the rotating electrical machine to the center of the shaft while maintaining the cooling capacity, It can be easily realized by devising.

  Hereinafter, the best mode for carrying out the present invention will be described based on examples.

  1 to 5 show the configuration of a turbine generator according to a first embodiment of the present invention. The turbine generator of the present embodiment is a sealed type (or a fully closed type) that cools the inside of the machine with a cooling medium enclosed in the machine.

  In the figure, reference numeral 11 denotes a stator frame, and a cylindrical stator core 12 is provided inside the stator frame 11. A plurality of slots 13 continuous in the axial direction are formed at predetermined intervals in the circumferential direction on the inner peripheral portion of the stator core 12, and a stator winding 14 is accommodated in the slot 13. A plurality of ventilation ducts 15 extending radially in the radial direction are formed in the stator core 12 at equal intervals in the axial direction (the arrangement of the ventilation ducts 15 may be unevenly spaced).

  On the inner peripheral side of the stator core 12, a rotor core 17 is disposed to face the air gap 16. A plurality of slots (not shown) that are continuous in the axial direction are formed on the outer peripheral portion of the rotor core 17 at a predetermined interval in the circumferential direction, and a rotor winding (not shown) is provided on the rotor core 17. It is stored. At both ends of the rotor core 17, cylindrical retaining rings 18 that press both ends of the rotor winding are provided. On the central axis of the rotor core 17, a rotation shaft 19 extending to both ends in the axial direction is provided integrally with the rotor core 17.

  End brackets 20 that are annular closing members are provided at both axial ends of the stator frame 11, and bearing devices 21 that rotatably support the rotary shaft 19 are provided on the inner peripheral side of the end bracket 20. It has been. At one end of the rotating shaft 19 (outside of the bearing device 21), a current collector 22 for supplying electric power to the rotating rotor winding is provided. The current collector 22 is a device that presses and contacts a carbon brush to a current collector ring provided at one end (outside the bearing device 21) of the rotary shaft 19 to electrically connect the fixed side and the rotary side. is there. At the other end of the rotating shaft 19 (outside the bearing device 21), a connecting portion with a turbine that is a rotation source of the generator is formed.

  At both ends of the rotary shaft 19 (inside the bearing device 21), there are provided fans 23 that increase the pressure of the cooling medium sealed in the machine and circulate the machine. In the present embodiment, the case where the fan 23 is used as the booster for the cooling medium has been described. However, a booster other than this may be used. The fans 23 provided at both ends of the rotating shaft 19 (inside the bearing device 21) have a symmetrical relationship with respect to the center line 24. The center line 24 is an intersecting line that intersects the rotating shaft 19 at a right angle, and is a bisecting line that equally divides the end brackets 20 equally.

  On the upper surface of the stator frame 11, terminals 25 extending upward so as to protrude from the upper surface are provided for three phases. This terminal 25 is for taking out generated electric power from the stator winding 14 electrically connected outside. Hanging parts 26 are provided at two positions on the front and rear sides of the stator frame 11, and this hanging tool 26 is used, for example, for lifting the generator main body by a crane when the generator main body is installed in the basic pit. Used.

Between the stator frame 11 and the stator core 12, ventilation sections 28a to 28g continuous in the circumferential direction are provided in parallel in the axial direction. Ventilation section 28a to 28g includes a plurality of specifications Setsuban 29 that partitions the space between the stator frame 11 and the stator core 12 in the axial direction, and the inner surface of the stator frame 11, and the outer peripheral surface of the stator core 12 And communicated with the ventilation 15 respectively. The ventilation sections 28 a to 28 g are symmetrically arranged with respect to the center line 24.

In the present embodiment, among the ventilation sections 28a to 28g provided in parallel in the axial direction, every other ventilation section 28b, 28d, 28f in the axial direction, and from the axial center. Coolers 30 a 1, 30 a 2, 30 b 1, 30 b 2, 30 c 1, 30 c 2 are provided at two locations in the circumferential direction between the lower stator core 12 and the stator frame 11. That is, the coolers 30a1, 30a1, 2 are provided at two locations in the circumferential direction in the same ventilation section 28b, 28d, 28f.
30a2, 30b1, 30b2, 30c1, 30c2 are arranged.

The coolers 30a1, 30a2, 30b1, 30b2, 30c1, and 30c2 have two cooling capacities that correspond to half of the conventional coolers, and three in the axial direction. In addition, it is located 45 degrees below the horizontal line passing through the axis center, and the arrangement direction is such that the longitudinal direction of the cooler is perpendicular to the radial line passing through the axis center It has become.

Further, on the outside of the coolers 30a1, 30a2, 30b1, 30b2, 30c1, and 30c2 in the stator frame 11, ventilation paths 31a1, 31a2, and 31b that are continuous in the axial direction are provided. More specifically, between the cooler disposed at an angle of 45 degrees below the horizontal line passing through the center of the axis and the stator frame 11, the ventilation passages 31 a 1 and 31 a 2 having a triangular cross-section have apexes having a triangular cross-section. An air passage 31b having a rectangular cross section is disposed between the stator frame 12 and the stator frame 11 so as to be positioned at the corners of the stator frame 11. The ventilation paths 31a1, 31a2 communicate with the ventilation sections 28b, 28d, 28f, and the ventilation path 31b communicates with the ventilation sections 28a, 28c, 28e, 28g.

Between the stator core 12 and the end bracket 20, air passages 33 to 36 that are continuous in the radial direction are provided. The ventilation paths 33 to 36 are formed by partitioning the space between the stator core 12 and the end bracket 20 by an annular partition plate 37 facing the outer peripheral side of the fan 23. The ventilation paths 33 and 34 communicate the exhaust side of the fan 23 with the ventilation paths 31 a 1 and 31 a 2, and are arranged symmetrically with respect to the center line 24. Ventilation path 35,
36 communicates the inlet side of the fan 23 with the ventilation path 31 b and is symmetrically arranged with respect to the center line 24.

  A plurality of ventilation circuits constituted by the above-described ventilation paths and the like are formed inside the generator. Three ventilation circuits of a first ventilation circuit 39, a second ventilation circuit 40, and a third ventilation circuit 41 are formed on one side of the center line 24 (left side as viewed in FIG. 5). Three ventilation circuits are also formed on the other side of the center line 24 (on the right side as viewed in FIG. 5). The three ventilation circuits formed on one side of the center line 24 and the three ventilation circuits formed on the other side of the center line 24 are arranged symmetrically with respect to the center line 24, and the flow of the cooling medium The temperature rise characteristic is also symmetrical.

  Therefore, in the following, the ventilation circuit configuration on one side of the center line 24 and the flow of the cooling medium will be described.

  The first ventilation circuit 39 is a closed loop indicated by a solid line arrow in the figure, reaches the ventilation duct 15 through the air gap 16 from the exhaust side of the fan 23, reaches the ventilation section 28a from the ventilation duct 15, and passes through the ventilation section. This is a circuit from 28a to the inlet side of the fan 23 through the ventilation paths 31b and 35. The first ventilation circuit 39 is a circuit configured such that the ventilation section 28a, the air gap 16, and the ventilation duct 15 are arranged in series.

  The second ventilation circuit 40 is a closed loop indicated by a dotted-line arrow in the figure, and reaches the cooler 30a1 from the exhaust side of the fan 23 via the ventilation path 33, and from the cooler 30a1 to the ventilation section 28b, the ventilation duct 15, This circuit reaches the air gap 16, the ventilation duct 15, and the ventilation section 28c, and extends from the ventilation section 28c to the intake side of the fan 23 through the ventilation paths 31b and 35.

  The third ventilation circuit 41 is a closed loop indicated by a broken-line arrow in the drawing, reaches the cooler 30b1 from the exhaust side of the fan 23 via the ventilation path 33, and passes from the cooler 30b1 to the ventilation section 28d, the ventilation duct 15, This circuit reaches the air gap 16, the ventilation duct 15, and the ventilation section 28c, and extends from the ventilation section 28c to the intake side of the fan 23 through the ventilation paths 31b and 35.

  Next, the flow of the cooling medium will be described. The rotation of the rotary shaft 19 increases the pressure of the cooling medium sealed in the machine and flows from the exhaust side of the fan 23 to each ventilation circuit.

In the first ventilation circuit 39, the cooling medium pressurized by the fan 23 flows in the axial direction toward the ventilation duct 15 communicating with the ventilation section 28a of the air gap 16. The cooling medium that reaches the ventilation duct 15 that communicates with the ventilation section 28a cools the inside of the stator core 12 and the stator winding 14 while moving the ventilation duct 15 from the inner peripheral side to the outer peripheral side of the stator core 12, that is, ventilation. It flows toward section 28a. The cooling medium that reaches the ventilation section 28 a cools the outer peripheral side of the stator core 12 and flows to the intake side of the fan 23 through the ventilation paths 31 b and 35.

In the second ventilation circuit 40, the cooling medium boosted by the fan 23 is directed to the ventilation path 31 a 1 via the ventilation path 33 while cooling the end of the stator core 12 and the coil end of the stator winding 14. Flowing in the radial direction. The cooling medium that has reached the ventilation path 31a1 flows in the axial direction toward the cooler 30a1. The cooling medium reaching the cooler 30a1 is cooled by the cooler 30a1, flows in the circumferential direction through the ventilation section 28b while cooling the outer peripheral side of the stator core 12, and flows to the ventilation duct 15 communicating with the ventilation section 28b. The cooling medium that reaches the ventilation duct 15 that communicates with the ventilation section 28b cools the inside of the stator core 12 and the stator winding 14 while moving the ventilation duct 15 from the outer peripheral side to the inner peripheral side of the stator core 12, that is, air. It flows toward the gap 16.

The cooling medium reaching the air gap 16 flows toward the ventilation duct 15 communicating with the ventilation section 28 c while cooling the inner peripheral side of the stator core 12. The cooling medium that reaches the ventilation duct 15 that communicates with the ventilation section 28c cools the inside of the stator core 12 and the stator winding 14 while moving the ventilation duct 15 from the inner peripheral side to the outer peripheral side of the stator core 12, that is, the ventilation. It flows toward section 28c. The cooling medium reaching the ventilation section 28 c cools the outer peripheral side of the stator core 12 and flows to the intake side of the fan 23 through the ventilation paths 31 b and 35.

  In the third ventilation circuit 41, the cooling medium boosted by the fan 23 flows toward the ventilation path 31 a 1 while cooling the end of the stator core 12 and the coil end of the stator winding 14. . The cooling medium that has reached the ventilation path 31a1 flows toward the cooler 30b1, and the cooling medium that has reached the cooler 30b1 is cooled by the cooler 30b1, and around the ventilation section 28d while cooling the outer peripheral side of the stator winding 14. It flows in the direction and flows into the ventilation duct 15 that communicates with the ventilation section 28d. The cooling medium that reaches the ventilation duct 15 that communicates with the ventilation section 28d cools the inside of the stator core 12 and the stator winding 14 while moving the ventilation duct 15 from the outer peripheral side to the inner peripheral side of the stator core 12, that is, air. It flows toward the gap 16.

The cooling medium reaching the air gap 16 flows toward the ventilation duct 15 communicating with the ventilation section 28 c while cooling the inner peripheral side of the stator core 12. The cooling medium that reaches the ventilation duct 15 that communicates with the ventilation section 28c cools the inside of the stator core 12 and the stator winding 14 while moving the ventilation duct 15 from the inner peripheral side to the outer peripheral side of the stator core 12, that is, the ventilation. It flows toward section 28c. The cooling medium reaching the ventilation section 28 c cools the outer peripheral side of the stator core 12 and flows to the intake side of the fan 23 through the ventilation paths 31 b and 35.

According to the present embodiment configured as described above, it is within three ventilation sections 28b, 28d, and 28f of the ventilation sections 28a to 28g provided in parallel in the axial direction and below the axial center. The coolers 30a1, 30a2, 30b1, 30b2, 30c1, and 30c2 are provided at two locations in the circumferential direction between the stator core 12 and the stator frame 11, and 45 degrees below the horizontal line passing through the shaft center. Since the ventilation passages 31a1, 31a2, and 31b that are continuous in the axial direction are provided outside the coolers 30a1, 30a2, 30b1, 30b2, 30c1, and 30c2 in the stator frame 11, While maintaining the cooling capacity, the coolers 30 a 1, 30 a 2, and the like are placed in the space between the outer periphery of the stator core 12 and the stator frame 11.
30b1, 30b2, 30c1, 30c2 can be accommodated, and the height from the lower end of the rotating electrical machine to the shaft center does not increase, and the connecting portion with the motor driven by the rotating shaft or the rotating body driven by the rotating electrical machine Even if it is higher than the height, it is not necessary to take measures such as adjusting the height of the prime mover or the rotating body to be connected, or digging the installation location of the rotating electrical machine.

  Therefore, while maintaining the cooling capacity of the rotating electrical machine, it is possible to obtain a rotating electrical machine that is reduced in size and weight by arranging the cooler without increasing the height and the total height from the lower end of the rotating electrical machine to the center of the shaft. .

  Further, the cooling medium boosted by the fan 23 is guided to the ventilation section 28d located in the axial center of the stator core, and the guided cooling medium is cooled by the coolers 30b1 and 30b2, and the cooled cooling medium is fixed. Since it distribute | circulates toward the inner peripheral side from the outer peripheral side of the child core 12, the cooled cold cooling medium can be supplied to the axial direction center part of the stator core 12. FIG.

  Therefore, the axial center part of the stator core 12 where the temperature of the supplied cooling medium becomes the highest and the air volume of the supplied cooling medium becomes the smallest can be cooled by the cold cooling medium, and is generated in the air gap 16. There is an effect that local heat generation is suppressed, the temperature rise distribution in the axial direction in the machine is leveled, and the thermal vibration stroke of the rotor can be suppressed.

In the present embodiment, the stator core 12 in the three ventilation sections 28b, 28d, and 28f of the ventilation sections 28a to 28g provided in parallel in the axial direction and below the axis center is provided. Coolers 30 a 1, 30 a 2, two places in the circumferential direction between the stator frames 11
Although an example in which 30b1, 30b2, 30c1, and 30c2 are installed has been described, the number of axial positions or ventilation sections in which a plurality of coolers are installed may be one or more. Further, the number of coolers installed in one axial position or ventilation section may be two or more, or may be installed above the rotating electrical machine.

Moreover, although the cross-sectional shape of the ventilation path 31a1, 31a2 was described as a triangle and the ventilation path 31b was a rectangle in this Embodiment, it cannot be overemphasized that the cross-sectional shape of a ventilation path may be circular.

  6 to 9 show a configuration of a turbine generator according to the second embodiment of the present invention.

The turbine generator of the present embodiment is a sealed type (or a fully closed type) as in the first embodiment. In the present embodiment, in the rotating electrical machine described in the first embodiment, with respect to a horizontal line passing through the axis center. Are provided between the coolers 30a1 and 30a2 and the stator frame 11 which are arranged obliquely 45 degrees below, and each of the ventilation passages extending in the axial direction is provided with ventilation passages 31c1 and 31d1 having two sectional triangles in the circumferential direction. The ventilation paths 31c2 and 31d2 are divided into the axially continuous ventilation paths 31c1 and 31c2 and communicated only with the ventilation section 28d, and the ventilation paths 31d1 and 31d2 are communicated with the ventilation section 28f.

  The cross-sectional areas of the ventilation paths 30c1, 30c2 and 30d1, 30d2 vary depending on the axial lengths of the ventilation sections 28d and 28f, and in this embodiment, the ventilation paths 31c1, 31c2 communicate with the ventilation section 28d at the axial center. The cross-sectional area is larger than the cross-sectional area of the air passages 31d1 and 31d2, and the amount of air flowing into the air-flowing section 28d is increased.

  By adopting such a configuration of the present embodiment, the same effect as in Example 1 described above can be achieved, of course, the cross-sectional area of the ventilation path is changed by the axial length of the ventilation section, etc. More efficient cooling can be performed.

  10 to 12 show the configuration of a turbine generator according to the third embodiment of the present invention. The turbine generator of the present embodiment shows an example of an open type that cools air taken into the machine as a cooling medium.

  The schematic configuration of the turbine generator of the present embodiment shown in the figure is similar to the sealed type (fully closed type) of Examples 1 and 2, and detailed description thereof is omitted, but the turbine generator of the present embodiment is omitted. Is an open type, and an inlet 51 for taking outside air into the machine is provided on the inner peripheral side of the end bracket 20 so as to face the fan 23, and on the outer peripheral side of the stator frame 11. An exhaust port 52 is provided for discharging outside air taken into the machine to the outside of the machine.

Further, between the stator frame 11 and the stator core 12, ventilation sections 28a to 28g continuous in the circumferential direction are provided in parallel in the axial direction. The ventilation sections 28 a to 28 g include a plurality of annular partition plates 29 that axially partition the space between the stator frame 11 and the stator core 12, the inner surface of the stator frame 11, and the outer peripheral surface of the stator core 12. And communicated with the ventilation duct 15 respectively. The ventilation sections 28 a to 28 g are arranged symmetrically with respect to the center line 24.

  In the present embodiment, the stator cores are arranged in three ventilation sections 28b, 28d, and 28f among the ventilation sections 28a to 28g provided in parallel in the axial direction, and above and below the axis center. Coolers 30e1, 30e2, 30e3, 30e4, 30f1, 30f2, 30f3, 30f4, 30g1, 30g2, 30g3, and 30g4 are provided at four locations in the circumferential direction between 12 and the stator frame 11. These coolers 30e1, 30e2, 30e3, 30e4, 30f1, 30f2, 30f3, 30f4, 30g1, 30g2, 30g3, and 30g4 have a cooling capacity equivalent to about 1/4 of the conventional cooler. Four locations are provided in the direction, and three locations are provided in the axial direction. At one location in the axial direction, they are arranged to face each other with respect to a horizontal line passing through the center of the shaft.

Further, a ventilation path 31e1 and a ventilation path 31e2 that are continuous in the axial direction are provided at the lower part of the coolers 30e1, 30f1, 30g1 and the coolers 30e2, 30f2, 30g2 in the stator frame 11, and further, On the stator frame 11 at the top of the coolers 30e3, 30f3, 30g3, and the coolers 30e4, 30f4, 30g4, and in the ventilation box 53, the ventilation path 31e3 and the ventilation path 31e4 that are continuous in the axial direction. Is provided.

  A plurality of ventilation circuits constituted by the above-described ventilation paths and the like are formed inside the generator. Three ventilation circuits of a first ventilation circuit 54, a second ventilation circuit 55, and a third ventilation circuit 56 are formed on one side of the center line 24 (on the left side as viewed in FIG. 12). Three ventilation circuits are also formed on the other side of the center line 24 (right side as viewed in FIG. 12). The three ventilation circuits formed on one side of the center line 24 and the three ventilation circuits formed on the other side of the center line 24 are arranged symmetrically with respect to the center line 24, and the flow of the cooling medium The temperature rise characteristic is also symmetrical.

  Therefore, in the following, the ventilation circuit configuration on one side of the center line 24 and the flow of the cooling medium will be described.

The first ventilation circuit 54 is a closed loop indicated by a solid line arrow in the drawing, and the cooling medium is guided into the apparatus by the fan 23 from the inlet 51, and the fan 23, the air gap 16, the ventilation duct 15, and the ventilation section 28a. , A circuit that reaches the exhaust port 52 through the ventilation path 31e3.

The second ventilation circuit 55 is a closed loop indicated by a dotted arrow in the figure, and the cooling medium is guided into the apparatus by the fan 23 from the inlet 51 and cooled from the fan 23 through the ventilation path 33 and the ventilation path 31e1. This is a circuit that reaches the ventilator 30e3 and extends from the cooler 30e3 to the exhaust port 52 through the ventilation section 28b, the ventilation duct 15, the air gap 16, the ventilation duct 15, the ventilation section 28c, and the ventilation path 31e3.

The third ventilation circuit 56 is a closed loop indicated by a broken-line arrow in the figure, and the cooling medium is guided into the apparatus by the fan 23 from the inlet 51 and cooled from the fan 23 through the ventilation path 33 and the ventilation path 31e1. This is a circuit from the cooler 30f3 to the exhaust port 52 through the ventilation section 28d, the ventilation duct 15, the air gap 16, the ventilation duct 15, the ventilation section 28c, and the ventilation path 31e3.

  Next, the flow of the cooling medium will be described. As the fan 23 rotates, outside air is taken into the apparatus from the air inlet 51, and the outside air boosted by the fan 23 flows to each ventilation circuit.

In the first ventilation circuit 54, the outside air pressurized by the fan 23 flows toward the ventilation duct 15 communicating with the ventilation section 28 a while cooling the inner peripheral side of the stator core 12, and the ventilation duct 15. The outside air that has reached the air flows through the ventilation duct 15 from the inner peripheral side to the outer peripheral side of the stator core 12, that is, toward the ventilation section 28a while cooling the inside of the stator core 12 and the stator windings. The outside air that reaches the ventilation section 28a cools the outer peripheral side of the stator core 12, and flows to the exhaust port 52 via the ventilation path 31e3.

  In the second ventilation circuit 55, the outside air boosted by the fan 23 flows toward the ventilation path 31 e 1 while cooling the end of the stator core 12 and the coil end of the stator winding 14. The outside air that has reached the ventilation path 31e1 flows toward the cooler 30e3 in the ventilation section 28b, and the outside air that has reached the cooler 30e3 is cooled by the cooler 30e3 and is ventilated while cooling the outer peripheral side of the stator core 12. It flows through the section 28b in the circumferential direction and flows into the ventilation duct 15 that communicates with the ventilation section 28b.

  The outside air that reaches the ventilation duct 15 communicating with the ventilation section 28b moves the ventilation duct 15 from the inner peripheral side to the outer peripheral side of the stator core 12, that is, the air gap, while cooling the inside of the stator core 12 and the stator winding 14. It flows toward 16. The outside air reaching the air gap 16 flows through the ventilation duct 15 communicating with the ventilation section 28 c while cooling the inner peripheral side of the stator core 12, and ventilates while cooling the inside of the stator core 12 and the stator winding 14. It flows toward section 28c. The outside air reaching the ventilation section 28c cools the outer peripheral side of the stator core 12, and flows to the exhaust port 52 via the ventilation path 31e3.

  In the third ventilation circuit 56, the outside air boosted by the fan 23 flows toward the ventilation path 31e1 while cooling the end of the stator core 12 and the coil end of the stator winding 14. The outside air that has reached the ventilation path 31e1 flows toward the cooler 30f3 in the ventilation section 28d, and the outside air that has reached the cooler 30f3 is cooled by the cooler 30f3 and is ventilated while cooling the outer peripheral side of the stator core 12. It flows through the section 28d in the circumferential direction and flows into the ventilation duct 15 that communicates with the ventilation section 28d.

  The outside air that reaches the ventilation duct 15 communicating with the ventilation section 28d cools the inside of the stator core 12 and the stator winding 14 while moving the ventilation duct 15 from the inner peripheral side to the outer peripheral side of the stator core 12, that is, the air gap. It flows toward 16. The outside air reaching the air gap 16 flows through the ventilation duct 15 communicating with the ventilation section 28 c while cooling the inner peripheral side of the stator core 12, and ventilates while cooling the inside of the stator core 12 and the stator winding 14. It flows toward section 28c. The outside air reaching the ventilation section 28c cools the outer peripheral side of the stator core 12, and flows to the exhaust port 52 via the ventilation path 31e3.

  According to the present embodiment configured as described above, the shaft from the lower end of the rotating electrical machine can be maintained while maintaining the cooling capacity of the rotating electrical machine, even in an open-type turbine generator that cools the air taken into the machine as a cooling medium. A cooler can be arranged without increasing the height to the center and the total height to obtain a compact and lightweight rotating electrical machine. The temperature of the supplied cooling medium is the highest, and the air volume of the supplied cooling medium The central part of the stator core in the axial direction with the least amount of heat can be cooled by a cold cooling medium, local heat generation in the air gap is suppressed, the temperature rise distribution in the axial direction in the machine is leveled, and the heat of the rotor There is an effect of suppressing the vibration stroke.

  In this embodiment, an example in which four sets of coolers are installed at three positions in the axial direction has been described. However, the number of axial positions or ventilation sections where a plurality of coolers are installed is one or more. Needless to say, there may be any number of two or more coolers installed in one axial position or ventilation section.

  FIGS. 13 to 15 show the configuration of a turbine generator according to a fourth embodiment of the present invention, which is an example of an open type turbine generator.

  In the present embodiment shown in the figure, they are arranged in three ventilation sections provided in parallel in the axial direction and between the stator core 12 and the stator frame 11 below the axial center. The coolers 30e1, 30e2, 30f1, 30f2, 30g1, 30g2 and the coolers 30e1, 30f1, 30g1 in the stator frame 11, the lower portions of the coolers 30e2, 30f2, 30g2, and the ventilation path 31e1 continuous in the axial direction. 31e2 and the arrangement of the ventilation passages 31e3 and 31e4 provided on the stator frame 11 and continuing in the axial direction are the same as in the third embodiment.

  In the present embodiment, two pieces are provided on the stator frame 11 and above the ventilation passages 31e3 and 31e4 that are continuous in the axial direction and in the circumferential direction at two positions in the axial direction. Four coolers 30 h 1, 30 h 2, 30 i 1 and 30 i 2 are installed and covered with a cooler cover 57. The coolers 30h1 and 30h2 are located on the left side in FIG. 13 with respect to the coolers 30e1 and 30e2 below the axis center, and the coolers 30i1 and 30i2 are the coolers 30g1 and 30g2 below the axis center. In contrast, it is shifted to the right side of FIG.

  The coolers 30h1, 30h2, 30i1, and 30i2 installed above the ventilation paths 31e3 and 31e4 and in the circumferential direction at two positions in the axial direction are fixed to the stator core 12 below the axial center. The coolers 30e1, 30e2, 30f1, 30f2, 30g1, and 30g2 arranged between the child frames 11 are larger than those of the coolers 30e1, 30e2, 30f1, 30f2, 30g1, and 30g2. , 30g2 is smaller than the coolers 30h1, 30h2, 30i1, 30i2.

According to the present embodiment configured as described above, the same effects as those of the above-described embodiments can be obtained, and in particular, the coolers 30h1, 30h2 having a larger physique than the coolers 30e1, 30e2, 30f1, 30f2, 30g1, 30g2. , 30i1, 30i2 are arranged, and the coolers 30e1, 30e2, 30f1, 30f2, 30g1, 30g2 are small and can be arranged without increasing the height from the lower end of the rotating electrical machine to the shaft center. . Also, a small cooler 30e1,
By using 30e2, 30f1, 30f2, 30g1, and 30g2, the coolers 30h1, 30h2, 30i1, and 30i2 provided above the rotating electrical machine can be downsized as compared with the case where the cooler is disposed only above. The cooler cover 57 is also reduced, and the overall height of the rotating electrical machine can be reduced.

  In this embodiment, an example in which two sets of coolers are installed below the rotating electrical machine in the circumferential direction with respect to three axial positions is shown. There can be any number of ventilation sections. Two or more sets of coolers may be installed at one axial position or ventilation section, or may be installed above the rotating electrical machine.

It is a perspective view showing a turbine generator which is a 1st embodiment of a rotating electrical machine of the present invention partially fractured. It is a front view of FIG. It is sectional drawing along the BB 'line of FIG. It is sectional drawing along the AA 'line of FIG. It is a figure for demonstrating the ventilation path | route of the cooling medium in the 1st Embodiment of this invention. It is a front view which shows the turbine generator which is the 2nd Embodiment of this invention. It is sectional drawing along the BB 'line of FIG. It is sectional drawing along the AA 'line of FIG. It is a figure for demonstrating the ventilation path | route of the cooling medium in the 2nd Embodiment of this invention. It is a front view which shows the turbine generator which is the 3rd Embodiment of this invention. It is sectional drawing along the AA 'line of FIG. It is a figure for demonstrating the ventilation path | route of the cooling medium in the 3rd Embodiment of this invention. It is a front view which shows the turbine generator which is the 4th Embodiment of this invention. It is sectional drawing along the BB 'line of FIG. It is sectional drawing along the AA 'line of FIG. It is a front view which shows the conventional turbine generator. It is sectional drawing along the AA 'line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Stator frame, 12 ... Stator iron core, 14 ... Stator winding, 15 ... Ventilation duct, 16 ... Air gap, 17 ... Rotor iron core, 19 ... Rotating shaft, 20 ... End bracket, 21 ... Bearing device, 22 ... current collector, 23 ... fan, 24 ... center line, 28a, 28b, 28c, 28d, 28e, 28f, 28g ... ventilation section, 29, 37 ... partition plates, 30a1, 30a2, 30b1, 30b2, 30c1, 30c2 , 30d1, 30d2, 30e1, 30e2, 30e3, 30e4, 30f1, 30f2, 30f3, 30f4, 30g1, 30g2, 30g3, 30g4, 30h1, 30h2, 30i1, 30i2 ... cooler, 31a1,
31a2, 31b, 31c1, 31c2, 31d1, 31d2, 31e1, 31e2,
31e3, 31e4, 33, 34, 35, 36 ... ventilation path, 39, 54 ... first ventilation circuit, 40, 55 ... second ventilation circuit, 41, 56 ... third ventilation circuit, 51 ... inlet 52 ... Exhaust port, 53 ... Ventilation box, 57 ... Cooler cover.

Claims (10)

A rotor core provided with a rotor winding, and a stator winding which is arranged to face the rotor core via an air gap, extends in the radial direction, and has a plurality of ventilation ducts at predetermined intervals in the axial direction. A stator core that is provided with the stator core, a plurality of ventilation sections that are provided between the stator frame and the stator core and are partitioned in the axial direction by a partition plate, and the stator A cooling medium that circulates in the frame and cools the inside of the machine, a cooler that is provided in the flow path of the cooling medium, cools the cooling medium, and is connected to the ventilation section and is continuous in the axial direction. With ventilation path,
A plurality of the coolers are arranged in the circumferential direction at the same position in the axial direction. A rotor core provided with a rotor winding, and a stator winding which is arranged to face the rotor core via an air gap, extends in the radial direction, and has a plurality of ventilation ducts at predetermined intervals in the axial direction. A stator core that is provided with the stator core, a plurality of ventilation sections that are provided between the stator frame and the stator core and are partitioned in the axial direction by a partition plate, and the stator A cooling medium that circulates in the frame and cools the inside of the machine, a cooler that is provided in the flow path of the cooling medium, cools the cooling medium, and is connected to the ventilation section and is continuous in the axial direction. With ventilation path,
A plurality of the coolers are arranged in a circumferential direction in the same ventilation section. A rotor core provided with a rotor winding, and a stator winding which is arranged to face the rotor core via an air gap, extends in the radial direction, and has a plurality of ventilation ducts at predetermined intervals in the axial direction. A stator core that is provided with the stator core, a plurality of ventilation sections that are provided between the stator frame and the stator core and are partitioned in the axial direction by a partition plate, and the stator A cooling medium that circulates in the frame and cools the inside of the machine, a cooler that is provided in the middle of the ventilation path of the cooling medium, and that cools the cooling medium, is connected to the ventilation section and is continuous in the axial direction. With ventilation path,
A plurality of the ventilation sections are partitioned in the axial direction, and the coolers are arranged in the ventilation direction every other ventilation section in the axial direction, and a plurality of the coolers are arranged in the circumferential direction in the same ventilation section. Rotating electric machine.   The rotating electrical machine according to any one of claims 1 to 3, wherein the axially continuous ventilation path is formed between the cooler and a stator frame.   The rotating electrical machine according to any one of claims 1 to 3, wherein the cooler is disposed below the axial center of the rotating electrical machine.   The rotating electrical machine according to any one of claims 1 to 3, wherein the cooler is disposed above an axial center of the rotating electrical machine.   2. The cooling device according to claim 1, wherein the cooling device is disposed both above and below the axis of the rotating electrical machine, and the cooling device disposed above is larger in cooling capacity than the cooling device disposed below. The rotating electrical machine according to any one of 1 to 3.   4. The rotating electrical machine according to claim 1, wherein two coolers are arranged in the circumferential direction at three positions in the axial direction. 5.   The rotating electrical machine according to any one of claims 1 to 8, wherein the rotating electrical machine is a hermetically sealed type or a fully closed type in which the inside is cooled by a cooling medium sealed in the machine. The rotary electric machine according to any one of claims 1 to 8, wherein the rotary electric machine is an open type that cools the inside using air taken into the machine as a cooling medium.