JP5325566B2 - Rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small and reliable rotating electrical machine which is equipped with a ventilation flue that can let flow cooling gas of sufficient air specification that suffices to cool a stator and a rotor without enlarging a casing more than necessary. <P>SOLUTION: This rotating electrical machine includes: a partition guide, which has an end face that is provided at roughly the same interval with the vane of a fan with the casing so as to form the ventilation flue between the flank of the casing and the fan and a fan facing part that is provided in cylindrical form at a specified interval with the flank of the fan; and a central guide, which is provided at roughly the same interval with the vane of the partition guide on the central side in the axial direction of the partition guide so as to form the ventilation flue between the fan and a gas cooler. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a rotating electrical machine, and more particularly, to a rotating electrical machine having a hermetically sealed cooling gas ventilation path for cooling a stator and a rotor.

In a hermetic rotary electric machine, cooling gas is passed through the stator and the rotor by fans attached to the rotating shafts on both sides of the rotor to cool the stator coil, the stator core, and the rotor coil.
The cooling gas ventilation system in a sealed rotary electric machine is roughly divided into a forward flow ventilation system that cools the interior of the rotary electric machine from the fan and then cools the gas through the gas cooler, and a fan that passes the gas cooler. There is a reverse flow ventilation system that cools the interior of the rotating electrical machine after the gas is cooled.

A forward flow ventilation type hermetic rotary electric machine includes a guide, a stator and a rotor provided inside the guide, fans provided at both ends of the rotor, a gas cooler that cools a cooling gas, and these. And a casing that fits inside.
In this forward flow ventilated hermetic rotary electric machine, the cooling gas cooled by the gas cooler flows through the ventilation path formed between the casing and the guide by the rotation of the fan, passes through the fan, and enters the inside of the guide. Sent in. The sent cooling gas cools the stator and the rotor, and then is discharged to the outer diameter side of the stator. The cooling gas discharged at a high temperature after cooling the stator and the rotor passes through the gas cooler, is cooled, and circulates again to the fan through the ventilation path (see, for example, Patent Document 1).

The reverse flow ventilation type hermetic rotary electric machine also includes a guide, a stator and a rotor provided inside the guide, fans provided at both ends of the rotor, a gas cooler for cooling the cooling gas, And a casing in which these are housed.
In this reverse flow ventilation type hermetic rotary electric machine, the fans provided at both ends of the rotor flow cooling gas in the opposite direction to the case of the forward flow ventilation type. The cooling gas discharged from the fan is guided to the gas cooler through the ventilation path. The low-temperature cooling gas cooled through the gas cooler is discharged from the gas cooler and distributed to the stator and the rotor, and after cooling the stator and the rotor, is guided to the fan again (for example, Patent Document 1). reference).
The air guide, the air guide plate, and the outer shell of Patent Document 1 correspond to the ventilation path, guide, and casing of the present specification, respectively.

Japanese Patent Laid-Open No. 2001-298906 (pages 2 to 3, FIGS. 12 to 13)

In the closed flow electric rotating machine of the forward flow ventilation method described in Patent Document 1, the cooling gas cooled by the gas cooler is guided to the fan through the ventilation path formed between the casing and the guide, and the guide from the fan It is sent inward.
In the closed-flow rotating electric machine of the reverse flow ventilation method described in Patent Document 1, the cooling gas discharged from the fan is guided to the gas cooler through the ventilation path, and the cooling gas cooled through the gas cooler is placed inside the guide. To be sent to.

  In both of the above-described forward flow ventilation method and reverse flow ventilation method, the sealed rotary electric machine uses a cooling gas that sufficiently cools the stator and the rotor without using a large fan that reduces the efficiency of the rotary electric machine. In order to obtain the air volume, the pressure loss in the ventilation path must be reduced. That is, it is necessary to increase the cross-sectional area perpendicular to the direction of the cooling gas in the ventilation path, and there is a problem that the size of the casing is increased and the rotating electrical machine cannot be reduced in size.

  The present invention has been made to solve the above-described problems, and allows a cooling gas having a sufficient air flow to cool the stator and the rotor without enlarging the casing more than necessary. It is to obtain a small and reliable rotating electric machine with a ventilation path that can be used.

A rotating electrical machine according to the present invention includes a rotor, fans attached to both ends of the rotor in the axial direction, a stator disposed coaxially with the rotor so as to surround the rotor with a predetermined gap, A sealed casing that houses the stator and the rotor, a gas cooler that cools the cooling gas that cools the stator and the rotor, and an air passage between the side surface of the casing and the fan inside the end surface of the casing A partition guide having a casing and an end surface portion provided at substantially the same interval as the fan blade length, a fan side surface and a fan facing portion provided in a cylindrical shape at a predetermined interval, and a fan. so as to form a ventilation passage between the gas cooler, and a center side guide provided at approximately equal intervals between blade length of the partition guides and the fan in the center side of the partition guides the axial direction, the center-side gas A flat plate-like portion provided between the fan and the rotor, facing a portion corresponding to the fan blade from the end on the shaft side to the outer peripheral portion, and through which the rotor shaft is inserted; An inclined portion that extends from the outer end of the portion and is inclined outward in the axial direction, and a flat portion that extends from the outer end of the inclined portion and faces the inner side of the end surface portion of the partition guide and is perpendicular to the axis It is what has been .

A rotating electrical machine according to the present invention includes a rotor, fans attached to both ends of the rotor in the axial direction, a stator disposed coaxially with the rotor so as to surround the rotor with a predetermined gap, A sealed casing that houses the stator and the rotor, a gas cooler that cools the cooling gas that cools the stator and the rotor, and an air passage between the side surface of the casing and the fan inside the end surface of the casing A partition guide having a casing and an end surface portion provided at substantially the same interval as the fan blade length, a fan side surface and a fan facing portion provided in a cylindrical shape at a predetermined interval, and a fan. so as to form a ventilation passage between the gas cooler, and a center side guide provided at approximately equal intervals between blade length of the partition guides and the fan in the center side of the partition guides the axial direction, the center-side gas A flat plate-like portion provided between the fan and the rotor, facing a portion corresponding to the fan blade from the end on the shaft side to the outer peripheral portion, and through which the rotor shaft is inserted; An inclined portion that extends from the outer end of the portion and is inclined outward in the axial direction, and a flat portion that extends from the outer end of the inclined portion and faces the inner side of the end surface portion of the partition guide and is perpendicular to the axis are are those that, cooling of the high efficiency of the stator and rotor in a rotating electrical machine enables the downsizing of the rotary electric machine.

Embodiment 1 FIG.
FIG. 1 is a schematic cross-sectional view of a rotating electrical machine according to Embodiment 1 of the present invention on a horizontal plane.
The bold arrow shown in FIG. 1 represents the flow of the cooling gas. As shown in FIG. 1, the rotating electrical machine 100 according to the present embodiment surrounds the rotor 5, the fans 4 attached to both ends of the rotor 5, and the rotor 5 with a predetermined gap 17. 5, a stator 15 disposed coaxially with the casing 5, a casing 1 of the rotating electrical machine, and a partition that is provided inside the end surface of the casing 1 so as to face the side surface of the casing 1, and forms an inlet-side ventilation passage 6 with the casing 1. The guide 2 is provided inside the partition guide 2 so as to be opposed to the partition guide 2, and the central guide 3 that forms the outlet-side ventilation path 7 with the partition guide 2, the stator 15, and the rotor 5 are cooled. A gas cooler 14 for cooling the cooling gas is provided. The inlet-side ventilation path 6 and the outlet-side ventilation path 7 are provided in parallel with the partition guide 2 interposed therebetween.

The partition guide 2 can form a ventilation path connected to the outer peripheral side of the stator 15 between the end surface portion 2a which is a surface parallel to the inner side of the end surface of the casing 1 and the outer peripheral side of the end surface portion 2a. The outer peripheral portion 2b provided in this manner, and the cylindrical fan facing portion 2c provided at a predetermined interval on the inner peripheral side of the end surface portion 2a and the side surface of the fan 4 are formed.
The center side guide 3 has a flat plate shape up to a plane perpendicular to the axis facing the inner side of the end face part and a part where the hole through which the axis passes corresponds to the end on the axis side of the fan 4 wing. Is inclined so as to gradually become the end face side in the axial direction as it goes outward in the radial direction. The reason why the central guide 3 has such a shape is that the minimum distance from the partition guide 2 is the same in any part.
The gas cooler 14 is provided between the center side guide 3 and the outer peripheral portion 2 b of the partition guide 2, that is, on the end face side in the axial direction of the stator 15.

Next, the cooling mechanism of the stator 15 and the rotor 5 by the cooling gas in the rotating electrical machine 100 of the present embodiment will be described.
First, the cooling gas is discharged from the gas cooler 14 to the space 10 formed by the axial end face of the stator core 15 and the central guide 3 by suction by the rotation of the fan 4. The cooling gas discharged from the gas cooler 14 branches and flows in the direction of the gap 17 between the rotor 5 and the stator core 15 a and the inner direction of the rotor 5.

The cooling gas flowing into the rotor 5 from the inner direction of the rotor 5, that is, from the holding ring 5 a of the rotor 5, passes through the cooling path provided in the axial direction and the radial direction inside the rotor 5 and rotates. The child coil 15 b is cooled and discharged to the gap 17.
The cooling gas directly flowing in the direction of the gap 17 is combined with the cooling gas discharged to the gap 17 from the rotor 5 and passes through the ventilation grooves provided in the radial direction of the stator core 15a to be fixed. After the child core 15a and the stator coil 15b are cooled, they are discharged to the back of the stator core 15a.

Next, the cooling gas discharged to the back portion (outer peripheral portion) of the stator core 15a has a direction perpendicular to the rotor axis (denoted as a direction perpendicular to the axis) in the inlet-side ventilation path 6 on the rotor shaft side. To the fan 4. The cooling gas that has passed through the fan 4 changes its direction, flows in the direction perpendicular to the axis in the outlet side ventilation path 7 to the outer peripheral side, and returns to the gas cooler 14. The cooling gas that has returned to the gas cooler 14 is cooled by the gas cooler 14, and is again discharged to the space 10 formed by the axial end face of the stator core 15 a and the central guide 3.
In the rotating electrical machine 100 of the present embodiment, the stator 15 and the rotor 5 are cooled by such circulation of the cooling gas.

FIG. 2 is a schematic cross-sectional view showing the structure of the main part of the ventilation path in the rotary electric machine according to Embodiment 1 of the present invention. The bold arrow shown in FIG. 2 represents the flow of the cooling gas.
In the rotating electrical machine 100 of the present embodiment, Wi / Fh, which is the ratio of the ventilation path width Wi in the direction parallel to the axis of the inlet-side ventilation path 6 shown in FIG. 2 and the blade length Fh of the fan 4, is changed. The ventilation efficiency Ef of the fan 4 was obtained, and these relationships are shown in FIG. 3 with Wi / Fh as the horizontal axis and Ef as the vertical axis. As shown in FIG. 3, when Wi / Fh is up to about 1, Ef increases greatly as the value increases. However, when Wi / Fh is about 1 or more, Ef is saturated and the increase becomes very small. I found.

  Further, the ventilation efficiency Ef of the fan 4 is obtained by changing Wo / Fh, which is the ratio of the ventilation path width Wo in the direction parallel to the axis of the outlet side ventilation path 7 shown in FIG. 2 and the blade length Fh of the fan 4. These relationships are shown in FIG. 4 with Wo / Fh as the horizontal axis and Ef as the vertical axis. As shown in FIG. 4, when Wo / Fh is about 1, Ef increases greatly as this value increases. However, when Wo / Fh is about 1 or more, Ef is saturated and the increase becomes very small. I found.

In the rotating electrical machine 100 of the present embodiment, the ventilation path width Wi of the inlet side ventilation path 6 and the blade length Fh of the fan 4 are substantially the same, and the ventilation path width Wo of the outlet side ventilation path 7 and the fan 4 The wing length Fh is substantially the same, the ventilation efficiency of the fan 4 is excellent, and the width of the inlet side ventilation path 6 and the outlet side ventilation path 7 is provided with a cooling gas circulation path. is there.
That is, the rotating electrical machine 100 of the present embodiment is capable of highly efficient cooling and downsizing of the stator and the rotor.
The outlet side and the inlet side are expressed in relation to the fan 4 in the case of the airflow direction shown in the figure. When the rotating machine 100 rotates in the reverse direction, the direction of the airflow is reversed and the outlet side and the inlet side are switched, but the same effect can be obtained. The same applies to other embodiments.

Embodiment 2. FIG.
FIG. 5 is a partial cross-sectional schematic view of the rotating electrical machine according to the second embodiment of the present invention.
The bold arrow shown in FIG. 5 represents the flow of the cooling gas. As shown in FIG. 5, in the rotating electrical machine 200 of the present embodiment, the partition guide 21 is bent in a U shape at a portion facing the outer peripheral portion of the fan 4, and the partition guide 21 is the case of the first embodiment. In addition to the end face portion 21a, the outer peripheral portion 21b, and the fan facing portion 21c, the inner surface portion 21d is provided as a surface perpendicular to the axis from the axial center of the fan facing portion 21c. The center side guide 3 is a plane perpendicular to the axis. 21 d of inner surface parts and the center side guide 3 oppose, and the exit side ventilation path 7 is formed among them. The other points are the same as the rotating electrical machine 100 of the first embodiment.

In the rotating electrical machine 200 of the present embodiment, the ventilation path width Wi of the inlet side ventilation path 6 and the wing length Fh of the fan 4 are substantially the same, and the ventilation path width Wo of the outlet side ventilation path 7 and the fan 4 are also set. The wing length Fh is substantially the same, the ventilation efficiency of the fan 4 is excellent, and the width of the inlet side ventilation path 6 and the outlet side ventilation path 7 is provided with a cooling gas circulation path. is there.
That is, the rotating electrical machine 200 of the present embodiment is also capable of highly efficient cooling and downsizing of the stator and the rotor. In particular, the direction of the cooling gas flowing after passing through the fan 4 is substantially perpendicular to the axis of the fan 4, and the ventilation resistance of the cooling gas is further reduced.

Embodiment 3 FIG.
FIG. 6 is a partial cross-sectional schematic view of a rotating electrical machine according to Embodiment 3 of the present invention.
The bold arrow shown in FIG. 6 represents the flow of the cooling gas. As shown in FIG. 6, in the rotating electrical machine 300 according to the present embodiment, the cooling gas that has passed through the fan 4 from the inlet-side ventilation path 6 does not use the central guide 3, and the stator 15 and the rotor 5 side. The rotating electrical machine 100 is the same as the rotating electrical machine 100 of the first embodiment except that the gas cooler 14 is provided on the outer peripheral side of the stator 15.

In the rotating electrical machine 300 of the present embodiment, the ventilation path width Wi of the inlet side ventilation path 6 and the wing length Fh of the fan 4 are substantially the same, so that the ventilation efficiency of the fan 4 is excellent and the inlet side ventilation path. 6 is provided with a cooling gas circulation path in which the width of 6 does not become too large.
That is, the rotating electrical machine 300 according to the present embodiment is capable of highly efficient cooling and downsizing of the stator and the rotor. In particular, since the central guide 3 is not used, the rotating electrical machine can be further reduced in size, and the cooling gas that has passed through the fan 4 is discharged into the space portion 20, so that the ventilation resistance of the cooling gas can be further reduced.

Embodiment 4 FIG.
FIG. 7 is a partial cross-sectional schematic view of a rotating electrical machine according to Embodiment 4 of the present invention.
The bold arrow shown in FIG. 7 represents the flow of the cooling gas. As shown in FIG. 7, the rotating electrical machine 400 according to the present embodiment reverses the rotation direction of the fan 4 and the rotating electrical machine 300 according to the third embodiment except that the inlet side ventilation path 6 is changed to the outlet side ventilation path 7. It is the same.

In the rotating electrical machine 400 of the present embodiment, the ventilation path width Wo of the outlet side ventilation path 7 and the wing length Fh of the fan 4 are substantially the same, so that the ventilation efficiency of the fan 4 is excellent and the outlet side ventilation path. 7 is provided with a cooling gas circulation path in which the width of 7 does not become too large.
That is, the rotating electrical machine 400 of the present embodiment is capable of highly efficient cooling and downsizing of the stator and the rotor. In particular, since the central guide 3 is not used, the rotating electrical machine can be further reduced in size, and the cooling gas enters the fan 4 from the space 30, so that the ventilation resistance of the cooling gas can be further reduced.

  The rotating electrical machine according to the present invention is capable of highly efficient cooling and downsizing of the stator and the rotor, and can be used as a compact and high-performance rotating electrical machine.

It is a cross-sectional schematic diagram in the horizontal surface of the rotary electric machine concerning Embodiment 1 of this invention. It is a cross-sectional schematic diagram which shows the structure of the ventilation path principal part in the rotary electric machine concerning Embodiment 1 of this invention. It is a figure which shows the relationship between Wi / Fh and Ef in the rotary electric machine concerning Embodiment 1 of this invention. It is a figure which shows the relationship between Wo / Fh and Ef in the rotary electric machine concerning Embodiment 1 of this invention. It is a partial cross section schematic diagram in the rotary electric machine concerning Embodiment 2 of this invention. It is a partial cross section schematic diagram in the rotary electric machine concerning Embodiment 3 of this invention. It is a partial cross section schematic diagram in the rotary electric machine concerning Embodiment 4 of this invention.

Explanation of symbols

1 casing, 2 partition guide, 2a end face part, 2b outer peripheral part,
2c Fan facing part, 3 center side guide, 4 fan, 5 rotor,
5a Rotor retaining ring, 6 inlet side ventilation path, 7 outlet side ventilation path,
10, 20, 30 space, 14 gas cooler, 15 stator, 15a stator core,
15b Stator coil, 17 gap, 21 partition guide, 21a end face part,
21b outer peripheral part, 21c fan facing part, 21d inner surface part,
100, 200, 300, 400 Rotating electric machine.

Claims (1)

A rotor, fans attached to both ends of the rotor in the axial direction, a stator arranged coaxially with the rotor so as to surround the rotor with a predetermined gap, the stator and the A sealed casing that houses the rotor, a gas cooler that cools the stator and the cooling gas that cools the rotor, and an end surface of the casing, between the side surface of the casing and the fan. A partition having an end surface portion provided at an interval substantially equal to the wing length of the fan and the fan, and a fan facing portion provided in a cylindrical shape at a predetermined interval from the side surface of the fan so as to form an air passage. At the center of the partition guide in the axial direction so as to form a ventilation path between the guide, the fan and the gas cooler, at an interval substantially equal to the blade length of the partition guide and the fan. And a vignetting central side guide,
The center guide is opposed to a portion of the fan blade provided between the fan and the rotor, corresponding to the portion from the end on the shaft side to the outer peripheral portion, and the shaft of the rotor is inserted. A flat plate portion, an inclined portion extending from the outer end of the flat plate portion and inclined outward in the axial direction, and extending from an outer end of the inclined portion and facing the inner side of the end surface portion of the partition guide A rotating electrical machine formed of a plane portion perpendicular to the axis .

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