JP5950642B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine in which, for example, a spacing piece for forming a cooling gas flow groove is provided in a coil end portion of a rotor coil.

  For example, cylindrical rotary electric machines that have been generally used in the past include those shown in FIGS. FIG. 19 is a perspective view showing a conventional rotating electrical machine. FIG. 20 is a plan view showing a main part of a conventional rotating electrical machine. FIG. 21 is a cross-sectional view showing a conventional rotating electrical machine. FIG. 22 is a cross-sectional view showing a main part of a coil end of a rotor coil in a conventional rotating electrical machine. FIG. 23 is a cross-sectional view showing a main part of a coil end of a rotor coil in a conventional rotating electrical machine.

  In these drawings, the rotor coil 3 of the rotor 1 having a cylindrical shape is housed in the slot of the rotor core 2, and the rotor coil 3 is cued at both axial ends of the rotor core 2. Is wound. Since the protruding coil end 3a portion of the rotor coil 3 is used under high speed rotation, a retaining ring (not shown) is provided on the outer peripheral side thereof, and the coil end 3a of the rotor coil 3 due to high centrifugal force is provided. It is formed so as to prevent deformation.

  The rotor 1 is cooled by a cooling gas flowing through the rotating electrical machine by a compression effect by a fan (not shown) provided on the rotor shaft 4 or a suction effect caused by a head difference due to a difference in diameter. It is formed so that. That is, the cooling gas is branched into a cooling gas guided to holes provided at both ends of the rotor core 2 and a cooling gas guided to the bottom of the body of the rotor coil 3. The rotor coil 3 is cooled by the cooling gas introduced from the bottom of the trunk portion.

  On the other hand, the cooling of the coil end 3 a portion of the rotor coil 3 is cooled by the cooling gas flowing between the coil ends 3 a of the adjacent rotor coils 3. That is, as shown in FIG. 19, the cooling gas branched to the coil end 3 a of the rotor coil 3 is shown in the cooling gas flow direction A from the outer end portion of the coil end 3 a of the rotor coil 3. As shown in FIG. 22, the cooling gas passage 5 between the coil ends 3a of the rotor coil 3 meanders as shown in the cooling gas flow direction B. As shown in FIG. 23, the cooling gas passage 6 between the arc portions 3 c of the coil end 3 a of the rotor coil 3 is shown in the cooling gas flow direction C. In such a manner, it circulates in a meandering manner and flows out of the coil end 3 a of the rotor coil 3 as the cooling gas flow direction D.

  As shown in FIG. 22, the meandering cooling gas passage 5 is formed by a combination arrangement of ventilation interval pieces 7 having a substantially triangular shape, and the meandering cooling gas passage 6 has a substantially triangular shape as shown in FIG. It is formed by a combination arrangement of the spacing pieces 8.

JP-A-9-322454

  In the conventional rotating electric machine described above, the ventilation gap piece 7 and the ventilation gap piece 8 are arranged between the coil ends 3a of the rotor coil 3, and the meandering cooling gas passage 5 and the meandering cooling gas passage 6 are formed. The coil end 3a of the rotor coil 3 is cooled by allowing the cooling gas to flow through the meandering cooling gas passage 5 and the meandering cooling gas passage 6.

  However, in order to further increase the output of the rotating electrical machine, the air volume and heat dissipation area of the cooling gas are not sufficient, and when the output of the rotating electrical machine is further increased, the temperature at the coil end of the rotor coil increases and the temperature increases. There was a problem of becoming.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to form a cooling gas passage in the coil conductor of the coil end of the rotor coil, thereby forming the coil end of the rotor coil. The rotating electrical machine which can reduce the temperature rise of this is provided.

A rotating electrical machine according to the present invention includes a rotor core configured on a rotor shaft, and a rotor coil mounted on the rotor core and wound with a coil end protruding from an end of the rotor core. In the rotating electrical machine in which the rotor is configured, the coil end of the rotor coil includes an arc portion and a plurality of coil conductors are laminated, and each of the plurality of coil conductors is formed in a radial direction. A cooling gas flow hole that communicates is provided, the cooling gas flow hole is arranged from the end side of the rotor core of the coil end to the arc portion, and the cooling gas flow hole is the rotation of the coil conductor. A closing plate that has an opening at the position of the cooling gas inlet on the end side of the core and that closes the cooling gas flow hole on the surface of the coil conductor is provided on the surface side of the coil conductor, and the cooling Body flow hole is also of a constituting the serpentine cooling air passage arranged in a staircase pattern.

In the rotating electrical machine according to the present invention, the rotating electrical machine according to the present invention includes a rotor core that is configured on a rotor shaft, and a coil end that is mounted on the rotor core and protrudes from an end of the rotor core. In a rotating electrical machine in which a rotor is constituted by a wound rotor coil, the coil end of the rotor coil has an arc part and is configured by stacking a plurality of coil conductors. A linear cooling gas circulation hole that is formed in each of the coil ends and that communicates in the radial direction is provided, and the cooling gas circulation hole is disposed from the end side of the rotor core of the coil end to the arc portion, and The gas flow hole has an opening at the position of the cooling gas inlet on the end side of the rotor core of the coil conductor, and the cooling gas flow on the surface of the coil conductor on the surface side of the coil conductor. Closing plate closing the hole is provided, the cooling gas flow hole, the cooling gas flow hole is of also constitute a linear cooling gas passages are arranged in a straight line.

  According to the rotating electrical machine according to the present invention, it is possible to obtain a rotating electrical machine capable of reducing the temperature rise of the coil end of the rotor coil by forming the cooling gas passage in the coil end of the rotor coil.

It is a perspective view which shows the rotary electric machine concerning Embodiment 1 of this invention. It is a top view which shows the principal part of the rotary electric machine concerning Embodiment 1 of this invention. It is sectional drawing which shows the principal part of the rotary electric machine concerning Embodiment 1 of this invention. FIG. 3 is a plan sectional view showing the main part of the coil end of the rotor coil in the rotary electric machine according to Embodiment 1 of the present invention. FIG. 3 is a cross-sectional view showing the main part of the coil end of the rotor coil in the rotary electric machine according to Embodiment 1 of the present invention. FIG. 3 is a perspective view showing the main part of the coil end of the rotor coil in the rotary electric machine according to Embodiment 1 of the present invention.

It is a plane sectional view showing the important section of the coil end of the rotor coil in the rotary electric machine concerning Embodiment 2 of this invention. It is a plane sectional view showing the important section of the coil end of the rotor coil in the rotary electric machine concerning Embodiment 3 of this invention. It is sectional drawing which shows the principal part of the coil end of the rotor coil in the rotary electric machine concerning Embodiment 3 of this invention. It is a perspective view which shows the principal part of the coil end of the rotor coil in the rotary electric machine concerning Embodiment 3 of this invention. It is a plane sectional view showing the important section of the coil end of the rotor coil in the rotary electric machine concerning Embodiment 4 of this invention. It is a plane sectional view showing the important section of the coil end of the rotor coil in the rotary electric machine concerning Embodiment 5 of this invention. It is sectional drawing which shows the principal part of the coil end of the rotor coil in the rotary electric machine concerning Embodiment 5 of this invention. It is a perspective view which shows the principal part of the coil end of the rotor coil in the rotary electric machine concerning Embodiment 5 of this invention. It is plane sectional drawing which shows the principal part of the coil end of the rotor coil in the rotary electric machine concerning Embodiment 6 of this invention. It is plane sectional drawing which shows the principal part of the coil end of the rotor coil in the rotary electric machine concerning Embodiment 7 of this invention. It is a perspective view which shows the principal part of the coil end of the rotor coil in the rotary electric machine concerning Embodiment 7 of this invention. It is a top sectional view showing a main part of a coil end of a rotor coil in a rotary electric machine according to Embodiment 8 of the present invention.

It is a perspective view which shows the conventional rotary electric machine. It is a top view which shows the principal part of the conventional rotary electric machine. It is sectional drawing which shows the conventional rotary electric machine. It is sectional drawing which shows the principal part of the coil end of the rotor coil in the conventional rotary electric machine. It is sectional drawing which shows the principal part of the coil end of the rotor coil in the conventional rotary electric machine.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 6. In each figure, the same or equivalent members and parts will be described with the same reference numerals. 1 is a perspective view showing a rotary electric machine according to Embodiment 1 of the present invention. FIG. 2 is a plan view showing a main part of the rotating electrical machine according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view showing the main part of the rotating electrical machine according to Embodiment 1 of the present invention. FIG. 4 is a plan sectional view showing the main part of the coil end of the rotor coil in the rotary electric machine according to Embodiment 1 of the present invention. FIG. 5 is a cross-sectional view showing the main part of the coil end of the rotor coil in the rotary electric machine according to Embodiment 1 of the present invention. FIG. 6 is a perspective view showing the main part of the coil end of the rotor coil in the rotary electric machine according to Embodiment 1 of the present invention.

  In each of these drawings, a rotor 1 of a rotating electrical machine is constituted by a rotor shaft 4, and a rotor core 2 having a plurality of slots formed therein, and a body portion is mounted on a slot formed in the rotor core 2. The coil end 3a is constituted by a rotor coil 3 wound around the end of the rotor core 2 so as to protrude therefrom. The body of the rotor coil 3 is cooled by the cooling gas that passes from the bottom of the body of the rotor coil 3 through the radial ventilation holes 3b provided in the body of the rotor coil 3 to the outer diameter side.

  Coil end spacing pieces 9 are disposed between the coil ends 3a of the rotor coil 3, and the figure includes, as an example, a recess for allowing cooling gas to flow outside the coil ends 3a adjacent to the vicinity of the center of the coil end spacing pieces 9. A ventilation path 9a is formed.

  The coil end 3a of the rotor coil 3 is configured by laminating a plurality of coil conductors 3a1, and a plurality of cooling gas flow holes 3a2 are formed in each of the plurality of coil conductors 3a1, and the cooling gas flow holes 3a2 are shown in FIG. As shown, the meandering cooling gas passages 10 are arranged stepwise.

  And the cooling gas circulation hole 3a2 of the position corresponded to the cooling gas inlet part 10a of the meandering cooling gas channel | path 10 formed in the coil end 3a of the rotor coil 3 opens, and the other cooling gas circulation hole located in the coil end 3a surface 3a2 is closed by closing plates 11 and 12. By doing so, the meandering cooling gas passage 10 shown in the cooling gas flow direction E is formed. As an example, the cooling gas inlet portion 10 a of the meandering cooling gas passage 10 is formed on the end portion side of the stator core 2.

  That is, the cooling gas that has flowed to the end side of the stator core 2 at the back of the coil end 3 a of the rotor coil 3 is the cooling gas of the meandering cooling gas passage 10 formed in the coil end 3 a of the rotor coil 3. The coil portion 3a flows into the meandering cooling gas passage 10 from the inlet portion 10a and circulates in a meandering manner as indicated by the cooling gas flow direction E in the linear portion of the coil end 3a of the rotor coil 3. Cool the straight part of the. Then, the cooling gas flows from the linear portion of the coil end 3 a of the rotor coil 3 to the arc portion 3 c side of the coil end 3 a of the rotor coil 3 and meanders in the arc portion 3 c of the coil end 3 a of the rotor coil 3. The arc portion 3c of the coil end 3a of the rotor coil 3 is cooled and flows out of the coil end 3a of the rotor coil 3.

  The coil end interval piece 9 disposed between the coil ends 3a of the rotor coil 3 includes a recess for allowing cooling gas to flow outside the coil end 3a adjacent to the vicinity of the center of the coil end interval piece 9. The ventilation path 9a is formed, and the cooling effect of the coil end 3a of the rotor coil 3 is enhanced.

  As described above, according to the first embodiment, the coil end 3a of the rotor coil 3 is configured by laminating a plurality of coil conductors 3a1, and the cooling gas flow holes 3a2 are formed in each of the plurality of coil conductors 3a1. A plurality of the cooling gas flow holes 3a2 are formed in a stepped manner so as to form a meandering cooling gas passage 10 as shown in FIG. 5, so that the meandering cooling gas passage 10 is provided in the coil end 3a of the rotor coil 3. Since it is possible to increase the air volume of the cooling gas and increase the heat radiation area, it is possible to obtain a rotating electrical machine that can remarkably reduce the temperature rise of the coil end 3a of the rotor coil 3.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIG. FIG. 7 is a plan sectional view showing the main part of the coil end of the rotor coil in the rotary electric machine according to Embodiment 2 of the present invention.

  In the first embodiment described above, the coil end interval piece 9 is disposed between the coil ends 3 a of the rotor coil 3, and the figure shows, as an example, outside the coil end 3 a adjacent to the vicinity of the center of the coil end interval piece 9. Although the case where the air passage 9a composed of the concave portion for allowing the cooling gas to flow is formed has been described, in the second embodiment, the coil end interval piece 9 in which the air passage 9a is not formed is used.

  Also in the second embodiment, the coil end 3a of the rotor coil 3 is configured by laminating a plurality of coil conductors 3a1, and a plurality of cooling gas flow holes 3a2 are formed in each of the plurality of coil conductors 3a1, As the gas flow holes 3a2 are arranged in a stepped manner so as to form a meandering cooling gas passage 10 as shown in FIG. 5, the meandering cooling gas passage 10 can be constituted in the coil end 3a of the rotor coil 3. Since it is possible to increase the air volume of the cooling gas and increase the heat radiation area, it is possible to obtain a rotating electrical machine capable of remarkably reducing the temperature rise of the coil end 3a of the rotor coil 3.

  Further, in the second embodiment, the simplified coil end interval piece 9 in which the air passage 9a is not formed can improve the manufacturability and reduce the cost.

Embodiment 3 FIG.
A third embodiment of the present invention will be described with reference to FIGS. 8 to 10. In the drawings, the same or corresponding members and parts will be described with the same reference numerals. FIG. 8 is a plan sectional view showing the main part of the coil end of the rotor coil in the rotary electric machine according to Embodiment 3 of the present invention. FIG. 9 is a cross-sectional view showing the main part of the coil end of the rotor coil in the rotary electric machine according to Embodiment 3 of the present invention. FIG. 10 is a perspective view showing the main part of the coil end of the rotor coil in the rotary electric machine according to Embodiment 3 of the present invention.

  In each of these drawings, a coil end spacing piece 9 is disposed between the coil ends 3a of the rotor coil 3, and as an example, the cooling gas is supplied to the outside of the coil end 3a adjacent to the vicinity of the center of the coil end spacing piece 9. An air passage 9a made of a recessed portion to be ventilated is formed.

  The coil end 3a of the rotor coil 3 is configured by laminating a plurality of coil conductors 3a1, and a plurality of cooling gas circulation holes 3a21 and a plurality of cooling gas circulation holes 3a22 are formed in each of the plurality of coil conductors 3a1. The circulation holes 3a21 and the cooling gas circulation holes 3a22 are arranged stepwise so as to constitute a meandering cooling gas passage 10 as shown in FIG.

  And the cooling gas circulation hole 3a21 and the cooling gas circulation hole 3a22 of the position corresponding to the cooling gas inlet part 10a of the meandering cooling gas channel | path 10 formed in the coil end 3a of the rotor coil 3 open, and other coil end 3a surface is formed. The cooling gas circulation holes 3a21 and the cooling gas circulation holes 3a22 which are located are closed by the closing plates 11 and 12. By doing so, two rows of meandering cooling gas passages 10 shown in the cooling gas flow direction E are formed. As an example, the cooling gas inlet portion 10 a of the meandering cooling gas passage 10 is formed on the end portion side of the stator core 2.

  That is, the cooling gas that has flowed to the end of the stator core 2 at the back of the coil end 3 a of the rotor coil 3 is in two or more rows of meandering cooling gas passages formed in the coil end 3 a of the rotor coil 3. 10 flows into the respective meandering cooling gas passages 10 from the cooling gas inlet portions 10a, and circulates in a meandering manner as indicated by the cooling gas flow direction E in the linear portion of the coil end 3a of the rotor coil 3. The straight part of the coil end 3a of the coil 3 is cooled. Then, the cooling gas flows from the linear portion of the coil end 3 a of the rotor coil 3 to the arc portion 3 c side of the coil end 3 a of the rotor coil 3 and meanders in the arc portion 3 c of the coil end 3 a of the rotor coil 3. The arc portion 3c of the coil end 3a of the rotor coil 3 is cooled and flows out of the coil end 3a of the rotor coil 3.

  The coil end interval piece 9 disposed between the coil ends 3a of the rotor coil 3 includes a recess for allowing cooling gas to flow outside the coil end 3a adjacent to the vicinity of the center of the coil end interval piece 9. The ventilation path 9a is formed, and the cooling effect of the coil end 3a of the rotor coil 3 is enhanced.

  As described above, according to the third embodiment, the coil end 3a of the rotor coil 3 is configured by laminating a plurality of coil conductors 3a1, and each of the plurality of coil conductors 3a1 has a cooling gas flow hole 3a21 and A plurality of cooling gas circulation holes 3a22 are formed, and the cooling gas circulation holes 3a21 and the cooling gas circulation holes 3a22 are arranged in a stepped manner so as to constitute two or more rows of meandering cooling gas passages 10, as shown in FIG. Thus, two or more rows of meandering cooling gas passages 10 can be formed in the coil end 3a of the rotor coil 3, and an increase in the amount of cooling gas and an increase in the heat radiation area can be achieved. A rotating electrical machine that can significantly reduce the temperature rise of the coil end 3a can be obtained.

  Further, in the third embodiment, since the meandering cooling gas passages 10 are formed in two or more rows, the cooling characteristics of the coil end 3a of the rotor coil 3 can be further improved as compared with the above-described embodiments. The temperature rise of the coil end 3a of the rotor coil 3 can be further reduced.

Embodiment 4 FIG.
A fourth embodiment of the present invention will be described with reference to FIG. FIG. 11 is a plan sectional view showing the main part of the coil end of the rotor coil in the rotary electric machine according to Embodiment 4 of the present invention.

  In the third embodiment described above, the coil end spacing piece 9 is disposed between the coil ends 3a of the rotor coil 3, and the figure shows, as an example, the outside of the coil end 3a adjacent to the vicinity of the center of the coil end spacing piece 9. Although the case where the air passage 9a composed of the recess for allowing the cooling gas to flow is formed has been described, in the fourth embodiment, the coil end interval piece 9 in which the air passage 9a is not formed is used.

  Also in the fourth embodiment, the coil end 3a of the rotor coil 3 is configured by laminating a plurality of coil conductors 3a1, and a cooling gas circulation hole 3a21 and a cooling gas circulation hole 3a22 are provided in each of the plurality of coil conductors 3a1. A plurality of the cooling gas flow holes 3a21 and the cooling gas flow holes 3a22 are arranged in a staircase pattern so as to constitute the meandering cooling gas passage 10, respectively, so that two rows are formed in the coil end 3a of the rotor coil 3. Since the meandering cooling gas passage 10 can be formed, and the air volume of the cooling gas can be increased and the heat radiation area can be increased, a rotating electrical machine that can remarkably reduce the temperature rise of the coil end 3a of the rotor coil 3 is provided. Can be obtained.

  In the fourth embodiment, the simplified coil end interval piece 9 in which the air passage 9a is not formed can improve the manufacturability and reduce the cost.

Embodiment 5 FIG.
Embodiment 5 of the present invention will be described with reference to FIGS. 12 to 14. In each figure, the same or corresponding members and parts will be described with the same reference numerals. FIG. 12 is a plan sectional view showing the main part of the coil end of the rotor coil in the rotary electric machine according to Embodiment 5 of the present invention. 13 is a cross-sectional view showing a main part of a coil end of a rotor coil in a rotary electric machine according to Embodiment 5 of the present invention. FIG. 14 is a perspective view showing the main part of the coil end of the rotor coil in the rotary electric machine according to Embodiment 5 of the present invention.

  In each of these drawings, a coil end spacing piece 9 is disposed between the coil ends 3a of the rotor coil 3, and as an example, the cooling gas is supplied to the outside of the coil end 3a adjacent to the vicinity of the center of the coil end spacing piece 9. An air passage 9a made of a recessed portion to be ventilated is formed.

  The coil end 3a of the rotor coil 3 is formed by laminating a plurality of coil conductors 3a3, and a linear cooling gas circulation hole 3a4 is formed in each of the plurality of coil conductors 3a3. These cooling gas circulation holes 3a4 are illustrated in FIG. As shown in FIG. 13, they are arranged so as to constitute a straight hole-shaped cooling gas passage 100.

  And the linear cooling gas circulation hole 3a4 of the position corresponding to the cooling gas inlet part 100a of the straight hole-shaped cooling gas channel | path 100 formed in the coil end 3a of the rotor coil 3 opens, and other coil end 3a surface is formed. The linear cooling gas flow hole 3 a 4 positioned is closed by the closing plates 11 and 12. By doing so, a straight hole-shaped cooling gas passage 100 shown in the cooling gas flow direction F is formed. In the figure, as an example, a cooling gas inlet portion 100a of a straight hole-shaped cooling gas passage 100 is formed on the end side of the stator core 2.

  That is, the cooling gas that has flowed to the end side of the stator core 2 at the back of the coil end 3 a of the rotor coil 3 is a straight hole-shaped cooling gas passage 100 formed in the coil end 3 a of the rotor coil 3. The cooling gas inlet 100a flows into the cooling gas passage 100 having a straight hole, and the linear portion of the coil end 3a of the rotor coil 3 flows in a straight line as indicated by the cooling gas flow direction F, and the rotor. The straight part of the coil end 3a of the coil 3 is cooled. Then, the cooling gas flows from the linear portion of the coil end 3 a of the rotor coil 3 to the arc portion 3 c side of the coil end 3 a of the rotor coil 3 and linearly flows in the arc portion 3 c of the coil end 3 a of the rotor coil 3. The arc portion 3c of the coil end 3a of the rotor coil 3 is cooled and flows out of the coil end 3a of the rotor coil 3.

  The coil end interval piece 9 disposed between the coil ends 3a of the rotor coil 3 includes a recess for allowing cooling gas to flow outside the coil end 3a adjacent to the vicinity of the center of the coil end interval piece 9. The ventilation path 9a is formed, and the cooling effect of the coil end 3a of the rotor coil 3 is enhanced.

  As described above, according to the fifth embodiment, the coil end 3a of the rotor coil 3 is configured by laminating a plurality of coil conductors 3a3, and linear cooling gas flow holes 3a4 are formed in the plurality of coil conductors 3a3. These cooling gas flow holes 3a4 are arranged so as to form a straight hole-shaped cooling gas passage 100 as shown in FIG. 13, so that a straight hole shape is formed in the coil end 3a of the rotor coil 3. Since the cooling gas passage 100 can be configured and the air volume of the cooling gas can be increased and the heat radiation area can be increased, a rotating electrical machine that can remarkably reduce the temperature rise of the coil end 3a of the rotor coil 3 is obtained. be able to.

Embodiment 6 FIG.
A sixth embodiment of the present invention will be described with reference to FIG. FIG. 15 is a plan sectional view showing an essential part of a coil end of a rotor coil in a rotary electric machine according to Embodiment 6 of the present invention.

  In the fifth embodiment described above, the coil end spacing piece 9 is disposed between the coil ends 3a of the rotor coil 3, and the figure shows, as an example, outside the coil end 3a adjacent to the vicinity of the center of the coil end spacing piece 9. Although the case where the air passage 9a made of the concave portion for allowing the cooling gas to flow is formed has been described, in the sixth embodiment, the coil end interval piece 9 in which the air passage 9a is not formed is used.

  Also in the sixth embodiment, the coil end 3a of the rotor coil 3 is configured by laminating a plurality of coil conductors 3a3, and linear cooling gas flow holes 3a4 are respectively formed in the plurality of coil conductors 3a3. By arranging the linear cooling gas flow holes 3a4 so as to constitute the straight hole-shaped cooling gas passage 100, the straight hole-shaped cooling gas passage 100 can be formed in the coil end 3a of the rotor coil 3. In addition, since it is possible to increase the air volume of the cooling gas and increase the heat radiation area, it is possible to obtain a rotating electrical machine that can significantly reduce the temperature rise of the coil end 3a of the rotor coil 3.

  In the sixth embodiment, the simplified coil end interval piece 9 in which the air passage 9a is not formed can improve the manufacturability and reduce the cost.

Embodiment 7 FIG.
A seventh embodiment of the present invention will be described with reference to FIGS. 16 and 17. In the drawings, the same or corresponding members and parts will be described with the same reference numerals. FIG. 16 is a plan sectional view showing the main part of the coil end of the rotor coil in the rotary electric machine according to Embodiment 7 of the present invention. FIG. 17 is a perspective view showing a main part of a coil end of a rotor coil in a rotary electric machine according to Embodiment 7 of the present invention.

  In each of these drawings, a coil end spacing piece 9 is disposed between the coil ends 3a of the rotor coil 3, and as an example, the cooling gas is supplied to the outside of the coil end 3a adjacent to the vicinity of the center of the coil end spacing piece 9. An air passage 9a made of a recessed portion to be ventilated is formed.

  The coil end 3a of the rotor coil 3 is formed by laminating a plurality of coil conductors 3a3. A linear cooling gas circulation hole 3a41 and a cooling gas circulation hole 3a42 are formed in each of the plurality of coil conductors 3a3. As shown in FIG. 17, the gas flow holes 3a41 and the cooling gas flow holes 3a42 are arranged so as to form two or more straight holes of the cooling gas passages 100.

  The linear cooling gas circulation holes 3a41 and the cooling gas circulation holes 3a42 at positions corresponding to the cooling gas inlet portions 100a of the two rows of straight hole cooling gas passages 100 formed in the coil end 3a of the rotor coil 3 are as follows. The linear cooling gas circulation holes 3a41 and the cooling gas circulation holes 3a42 that are open and located on the surface of the coil end 3a are closed by the closing plates 11 and 12. Although not shown, it is configured as shown in FIG. By doing so, two rows of linear cooling gas passages 100 shown in the cooling gas flow direction F are formed. In the figure, as an example, a cooling gas inlet portion 100a of a straight hole-shaped cooling gas passage 100 is formed on the end side of the stator core 2.

  That is, the cooling gas that has flowed to the end side of the stator core 2 at the back of the coil end 3 a of the rotor coil 3 is formed in two or more rows of straight holes formed in the coil end 3 a of the rotor coil 3. The cooling gas passage 100 flows from the cooling gas inlet portion 100a into each of the straight hole-shaped cooling gas passages 100, and the straight portion of the coil end 3a of the rotor coil 3 is linear as shown by the cooling gas flow direction F. And the straight portion of the coil end 3a of the rotor coil 3 is cooled. Then, the cooling gas flows from the linear portion of the coil end 3 a of the rotor coil 3 to the arc portion 3 c side of the coil end 3 a of the rotor coil 3 and linearly flows in the arc portion 3 c of the coil end 3 a of the rotor coil 3. The arc portion 3c of the coil end 3a of the rotor coil 3 is cooled and flows out of the coil end 3a of the rotor coil 3.

  The coil end interval piece 9 disposed between the coil ends 3a of the rotor coil 3 includes a recess for allowing cooling gas to flow outside the coil end 3a adjacent to the vicinity of the center of the coil end interval piece 9. The ventilation path 9a is formed, and the cooling effect of the coil end 3a of the rotor coil 3 is enhanced.

  As described above, according to the seventh embodiment, the coil end 3a of the rotor coil 3 is configured by laminating a plurality of coil conductors 3a3, and linear cooling gas flows through each of the plurality of coil conductors 3a3. Holes 3a41 and cooling gas circulation holes 3a42 are formed, and these cooling gas circulation holes 3a41 and cooling gas circulation holes 3a42 are arranged so as to form two or more straight holes of cooling gas passages 100 as shown in FIG. As a result, two rows of straight hole-shaped cooling gas passages 100 can be formed in the coil end 3a of the rotor coil 3, and an increase in the amount of cooling gas and an increase in the heat radiation area can be achieved. Thus, it is possible to obtain a rotating electrical machine that can significantly reduce the temperature rise of the third coil end 3a.

  Further, in the seventh embodiment, since the cooling gas passages 100 in the form of straight holes are formed in two or more rows, the cooling characteristics of the coil end 3a of the rotor coil 3 are further improved as compared with the sixth embodiment described above. The temperature rise of the coil end 3a of the rotor coil 3 can be further reduced.

Embodiment 8 FIG.
An eighth embodiment of the present invention will be described with reference to FIG. FIG. 17 is a plan sectional view showing the main part of the coil end of the rotor coil in the rotary electric machine according to Embodiment 8 of the present invention.

  In the above-described seventh embodiment, the coil end spacing piece 9 is disposed between the coil ends 3a of the rotor coil 3, and the figure shows, as an example, the outside of the coil end 3a adjacent to the vicinity of the center of the coil end spacing piece 9. Although the description has been given of the case where the air passage 9a including the recess for allowing the cooling gas to pass is formed, the coil end interval piece 9 in which the air passage 9a is not formed is used in the eighth embodiment.

  Also in the eighth embodiment, the coil end 3a of the rotor coil 3 is configured by laminating a plurality of coil conductors 3a3, and each of the plurality of coil conductors 3a3 has a linear cooling gas circulation hole 3a41 and a cooling gas circulation. The holes 3a42 are formed, and the linear cooling gas circulation holes 3a41 and the cooling gas circulation holes 3a42 are arranged so as to form two or more straight cooling gas passages 100, so that the coil end of the rotor coil 3 is arranged. Two or more straight-hole-shaped cooling gas passages 100 can be formed in 3a, and the air volume of the cooling gas and the heat radiation area can be increased. Therefore, the temperature rise of the coil end 3a of the rotor coil 3 can be increased. A rotating electrical machine that can be significantly reduced can be obtained.

  In the eighth embodiment, the simplified coil end interval piece 9 in which the air passage 9a is not formed can improve the manufacturability and reduce the cost.

  It should be noted that within the scope of the present invention, the embodiments can be freely combined, or the embodiments can be appropriately modified or omitted.

  The present invention is suitable for realizing a rotating electrical machine that can reduce the temperature rise of the coil end of the rotor winding by forming a cooling gas passage in the coil end of the rotor winding.

DESCRIPTION OF SYMBOLS 1 Rotor 2 Rotor iron core 3 Rotor coil 3a Coil end 3a1 Coil conductor 3a2 Cooling gas flow hole 3a21 Cooling gas flow hole 3a22 Cooling gas flow hole 3a3 Coil conductor 3a4 Linear cooling gas flow hole 3a41 Linear cooling gas flow Hole 3a42 Linear cooling gas flow hole 4 Rotor shaft 10 Meandering cooling gas passage 100 Straight hole cooling gas passage

Claims (4)

Rotation in which a rotor is constituted by a rotor core constituted by a rotor shaft, and a rotor coil that is mounted on the rotor core and wound with a coil end protruding from an end of the rotor core. In the electric machine, the coil end of the rotor coil has an arc portion and is configured by stacking a plurality of coil conductors, and provided with a cooling gas circulation hole formed in each of the plurality of coil conductors and communicating in the radial direction. The cooling gas flow hole is disposed from the end side of the rotor core of the coil end to the arc portion, and the cooling gas flow hole is cooled to the end side of the rotor core of the coil conductor. A closing plate is provided on the surface side of the coil conductor to close the cooling gas flow hole on the surface of the coil conductor, and the cooling gas flow holes are arranged in a step shape. Rotary electric machine characterized by constituting the serpentine cooling gas passageway.   2. The rotating electrical machine according to claim 1, wherein the meandering cooling gas passage is provided in a plurality of rows at the coil end of the rotor coil. Rotation in which a rotor is constituted by a rotor core constituted by a rotor shaft, and a rotor coil that is mounted on the rotor core and wound with a coil end protruding from an end of the rotor core. In the electric machine, the coil end of the rotor coil has an arc portion and is configured by stacking a plurality of coil conductors, and a linear cooling gas flow formed in each of the plurality of coil conductors and communicating in a radial direction. A hole is provided, and the cooling gas flow hole is disposed from the end side of the rotor core of the coil end to the arc part, and the cooling gas flow hole is an end of the rotor core of the coil conductor. An opening is provided at the position of the cooling gas inlet portion on the side, and a closing plate for closing the cooling gas flow hole on the surface of the coil conductor is provided on the surface side of the coil conductor, and the cooling gas flow hole is A rotary electric machine gas flow hole is characterized in that it constitutes a linear cooling gas passages are arranged in a straight line.   4. The rotating electrical machine according to claim 3, wherein the linear cooling gas passage is provided in a plurality of rows at the coil end of the rotor coil.

Images