JP4897587B2 - Rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the cooling performance of a rotor coil by increasing ventilation amounts by reducing resistance to the wind flow at the ventilation passage inlet port on the inner circumferential side of an end plate 17. <P>SOLUTION: The rotor 2 arranged inside the stator is provided with a holding ring 11 for holding a rotor coil 10, a plurality of rotor baffles 12 for forming the ventilation passage are arranged on the inner circumferential side of the holding rings 11, furthermore the rotor 2 is provided with fans 3 for circulating cooling gas within the rotary electric machine, and a guide plate 16 is installed on the inlet side port surface of the cooling gas flow in the rotor baffles 12, wherein the guide plate 16 is provided with a tapered part 16a on a delay side relative to the rotary direction B of the rotor 2. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a rotor structure of a rotating electrical machine, and in particular, a structure for reducing the wind resistance of an inlet in a cooling gas ventilation path formed in the rotor and increasing the amount of wind flowing through the ventilation path in the rotor. It is about.

  In conventional rotating electrical machines, the cooling gas cooled by the gas cooler is pumped by a fan and flows into the stator coil end chamber, where it is divided into two main paths, and one flow cools the stator coil end. Flows into the gap between the stator core and the rotor core.

  The other flow flows into the holding ring to cool the rotor coil installed in the rotor core, and after cooling the rotor coil end and the rotor coil linear part, the stator core and the rotor core It flows into the gap between them and merges with the former flow. The combined cooling gas is cooled to the stator core and the stator coil, and then sent to the gas cooler.

  And, on the circumference of the inner end side of the rotor end plate in the holding ring, a space portion serving as a cooling gas ventilation path inlet is provided, and a space portion divided at the lower portion of the rotor coil end inside the holding ring; The rotor baffles are arranged side by side to prevent the cooling gas from entering.

  Further, in the cooling air inflow passage, two flow cascades are provided toward the rotor winding with respect to the flow direction, and each flow cascade stage has a number of rotations arranged on the inner periphery of the ring-shaped support. There was a thing provided with a wing (refer to patent documents 1).

Japanese Patent Laid-Open No. 10-201176

  Since the rotor structure of the conventional rotating electric machine is configured as described above, the rotor baffle installed to form the cooling gas ventilation path is cooled at the inlet of the cooling gas ventilation path flowing to the rotor coil. It will obstruct the flow of gas. Therefore, the rotor baffle resists the flow of the cooling gas when the rotor rotates, and there is a problem that the amount of air flowing to the ventilation path is limited.

  The present invention has been made to solve the above-described problems, and by forming a tapered structure on the guide plate, the resistance to the flow of cooling gas is reduced and the cooling performance of the rotor coil is improved. It is intended.

A rotating electrical machine according to the present invention includes a stator around which a stator coil is wound, a rotor disposed inside the stator, and a cylindrical object for holding the rotor coil provided on the rotor. And a partition provided inside the cylindrical body and a fan provided in the rotor, and the inlet side surface of the cooling gas flow in the partition with respect to the rotation direction of the rotor A guide plate provided with a tapered portion on the delay side is installed, and a protrusion is provided on the inlet side surface of the cooling gas flow in the guide plate on the advance side with respect to the rotation direction of the rotor. .

According to the rotating electrical machine of the present invention, the stator around which the stator coil is wound, the rotor disposed inside the stator, and the cylinder for holding the rotor coil provided on the rotor. And a partition provided inside the cylindrical object, and a fan provided in the rotor, the cooling gas flow inlet side surface of the partition in the direction of rotation of the rotor. On the other hand, a guide plate provided with a tapered portion on the delay side is installed, and a protrusion is provided on the inlet side surface of the cooling gas flow in the guide plate on the leading side with respect to the rotation direction of the rotor . When the rotor rotates in the rotation direction, the cooling gas flows smoothly along the protrusion and the taper, and the resistance to the wind flow at the inlet of the ventilation path on the inner peripheral side of the cylindrical object is reduced. The amount can be increased, times Thereby improving the cooling performance of the child coil.

Embodiment 1 FIG.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a cross-sectional view showing a rotary electric machine according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing a rotor portion, and FIG. 3 is a cross-sectional view showing the rotor portion. In FIG. 1, the ventilation circulation path | route of the cooling gas in the stator frame of a rotary electric machine is shown.

  In the rotating electrical machine, each part is cooled by circulation of gas (hydrogen or air) sealed in the stator frame 1. The rotor 2 is provided with a fan 3, and gas is circulated through the rotating electrical machine by the fan 3 when the rotor 2 rotates.

  The cooling gas cooled by the gas cooler 4 is sent out by the fan 3 and flows into the stator coil end chamber 5. Therefore, the flow is roughly divided into two paths, and one flow cools the stator coil end 6 and flows into the gap 9 between the stator core 7 and the rotor core 8.

  The other flow flows into the holding ring 11 to cool the rotor coil 10 installed in the rotor core 8 and is guided to the ventilation path formed by the rotor baffle 12. After the rotor coil end 10a and the rotor coil linear portion 10b are cooled by being guided into the air passage 13 and the slot in the rotor core provided in the rotor core, the air gap 9 between the stator iron core 7 and the rotor iron core 8 Merges with the former flow.

  The combined cooling gas is sent to the gas cooler 4 after cooling the stator core 7 and the stator coil. The holding ring 11 is provided to hold the rotor coil 10 and the like, and a partition plate 14 and an insulating baffle 15 are provided inside the holding ring 11.

  FIG. 4 is a perspective view showing a portion X in FIG. 1, and shows a state in which a guide plate 16 described later is removed. A rotor baffle 12 is installed side by side on the inner circumference of the rotor end plate 17 in the holding ring 11. The rotor baffle 12 is formed by dividing the cooling gas ventilation path so that the rotor coil 10 is cooled.

  5 is a front view showing a rotor portion, FIG. 6 is a cross-sectional view taken along line AA in FIG. 5, and FIG. 7 is a perspective view showing a guide plate. The guide plate 16 is installed by fastening with bolts on the inlet side surface of the cooling gas flow in the rotor baffle 12 installed on the inner peripheral side of the rotor end plate 17.

  The cooling gas passes between the rotor baffles 12, that is, between the guide plates 16. The guide plate 16 is provided with a tapered portion 16a on the delay side of the rotation direction with respect to the rotation direction B of the rotor.

  With this configuration, when the rotor rotates in the rotation direction B, the cooling gas smoothly flows along the tapered portion 16a, and the wind flow at the ventilation path entrance on the inner peripheral side of the end plate 17 is achieved. Can be reduced, the air flow rate can be increased, and the cooling performance of the rotor coil can be improved.

  In the above description, the case where the gas sealed in the stator frame 1 is cooled by the gas cooler 4 has been described. However, the stator frame 1 and the like are provided with ventilation holes and rotated by the flow of wind from the outside. The child coil 10 may be cooled.

Embodiment 2. FIG.
8 is a cross-sectional view showing a rotor baffle portion in a rotor of a rotating electrical machine according to Embodiment 2 of the present invention, and is a cross-sectional view corresponding to FIG. In the present embodiment, without providing the guide plate as shown in the first embodiment, the surface of the rotor baffle 12 on the inlet side of the wind flow, the rotational direction relative to the rotational direction B of the rotor The taper part 21 is directly provided on the delay side.

  With the configuration described above, when the rotor rotates in the rotation direction B, the cooling gas smoothly flows along the tapered portion 21, and the wind at the inlet of the ventilation path on the inner peripheral side of the end plate 17 can be obtained. The resistance to the flow is reduced, the amount of ventilation can be increased, the cooling performance of the rotor coil 10 can be improved, and a guide plate is not required as compared with the case of the first embodiment, thereby reducing the number of parts. Since it can reduce, cost can be reduced.

Embodiment 3 FIG.
9 is a cross-sectional view showing a rotor baffle portion in a rotor of a rotary electric machine according to Embodiment 3 of the present invention, and is a cross-sectional view corresponding to FIG. In the present embodiment, a guide plate 31 having a different shape from the guide plate 16 shown in the first embodiment is installed.

  In FIG. 9, with respect to the rotational direction B of the rotor, a tapered portion 31a is installed on the delay side in the rotational direction, and a protruding portion 31b is installed on the advanced side in the rotational direction.

  By configuring as described above, when the rotor rotates in the rotation direction B, the cooling gas smoothly flows along the protruding portion 31b and the tapered portion 31a, and the ventilation path on the inner peripheral side of the end plate 17 Resistance to the wind flow at the inlet is reduced, the amount of air flowing through the ventilation path during rotor rotation can be further increased, and the cooling performance of the rotor coil 10 can be further improved.

  In the above description, the protrusion 31b is provided on the guide plate 31. However, in the structure shown in FIG. 8, the protrusion may be provided on the leading side in the rotational direction. By comprising in this way, the air volume which flows through the ventilation path at the time of rotor rotation can be increased more, and the cooling performance of the rotor coil 10 can further be improved.

Embodiment 4 FIG.
10 is a perspective view showing a rotor portion of a rotating electrical machine according to Embodiment 4 of the present invention, and corresponds to FIG. In the first to third embodiments, the case where various taper portions are provided on the rotor baffle 12 and the guide plate provided on the rotor end plate 17 has been described.

  On the other hand, as shown in FIG. 10, when the protrusion 42 for forming the ventilation path is provided on the circumference of the rotor 2 accommodated in the cylindrical structure 41, It is also possible to provide a taper portion 43 on the surface of the inlet side of the flow, on the delay side of the rotational direction with respect to the rotational direction B of the rotor.

  By configuring as described above, as in the case of the first to third embodiments, when the rotor rotates in the rotation direction B, the cooling gas smoothly flows along the tapered portion 43, and the ventilation path Resistance to the wind flow at the inlet is reduced, the air flow rate can be increased, and the cooling performance of the rotor coil can be improved.

  In the above description, the case where the tapered portion 43 is provided directly on the surface of the protrusion 42 on the inlet side of the wind flow has been described. However, as in the case of the first embodiment, the tapered portion is provided on the guide plate. Alternatively, a protruding portion may be provided on the advancing side in the rotational direction together with the tapered portion.

  Note that the retaining ring 11 shown in the first to third embodiments and the cylindrical structure 41 shown in the fourth embodiment are collectively referred to as a cylindrical body for holding the rotor core, and further, the above-described embodiment. 1-3, the rotor baffle 12 shown in FIGS. 1 to 3 and the protrusions shown in the fourth embodiment can be collectively referred to as a partition, and in the present invention, the cooling gas in the partition installed inside the cylindrical object A guide plate or the like is provided on the inlet side surface of the flow.

It is sectional drawing which shows the rotary electric machine by Embodiment 1 of this invention. It is a perspective view which shows a rotor part. It is sectional drawing which shows a rotor part. It is a perspective view which shows the X section in FIG. It is a front view which shows a rotor part. It is the sectional view on the AA line in FIG. It is a perspective view which shows a guide plate. It is sectional drawing which shows the rotor baffle part in the rotor of the rotary electric machine by Embodiment 2 of this invention. It is sectional drawing which shows the rotor baffle part in the rotor of the rotary electric machine by Embodiment 3 of this invention. It is a perspective view which shows the rotor part of the rotary electric machine by Embodiment 4 of this invention.

Explanation of symbols

3 fan, 2 rotor, 16 guide plate, 16a, 21, 43 taper part,
31b Protruding part.

Claims (2)

A stator around which a stator coil is wound, a rotor disposed inside the stator, a cylindrical body for holding the rotor coil provided on the rotor, and an interior of the cylindrical body In the rotating electrical machine having the partition provided in the rotor and the fan provided in the rotor, the cooling gas flow inlet side surface of the partition is on the delay side with respect to the rotation direction of the rotor. A guide plate provided with a tapered portion is installed, and a protrusion is provided on the inlet side surface of the cooling gas flow in the guide plate on the leading side with respect to the rotation direction of the rotor. Rotating electric machine. A stator around which a stator coil is wound, a rotor disposed inside the stator, a cylindrical body for holding the rotor coil provided on the rotor, and an interior of the cylindrical body In the rotating electrical machine having the partition provided in the rotor and the fan provided in the rotor, the cooling gas flow inlet side surface of the partition is on the delay side with respect to the rotation direction of the rotor. Rutotomoni provided a tapered portion, the inlet-side surface of the cooling gas flow in the partition portion, the rotating electrical machine, characterized in that a projecting portion on its leading side with respect to the rotation direction of the rotor.

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