JP5605777B2 - Fully-closed brushless rotating electrical machine with cooler - Google Patents

Description

  The present invention relates to a cooling air passage arrangement structure for a fully-closed brushless rotating electrical machine with a cooler.

  A fully-closed brushless rotating electrical machine with a cooler can take in outside air for cooling when the outside air contains substances that may adversely affect the components that make up the rotating electrical machine, such as dust, oil droplets, and steam. In order to install in an environment where the rotating electrical machine cannot be used, the components constituting the rotating electrical machine are sealed against the outside air by the main body frame, and cooling air cooled by a cooler mounted in the main body frame is circulated inside the rotating electrical machine. In addition, the fully closed AC exciter does not take in the outside air for the same reason, and the cooling air is diverted from the fully closed brushless rotating electrical machine with a cooler and is cooled by introducing it into the fully closed AC exciter. .

A conventional fully-closed brushless rotating electric machine with a cooler includes an air passage for cooling each part of a fully-closed AC exciter (Patent Document 1).
Hereinafter, a conventional fully-closed brushless rotating electrical machine with a cooler will be described with reference to FIG.

  In a conventional fully-closed brushless rotating electrical machine with a cooler, a stator core 2, a bearing 3, and a fully-closed AC exciter 4 are installed on a common base 1. A rotor core 6 having a rotor coil 5 is held by a rotor 7 and a bearing 3 so as to be rotatable in an inner space portion of the stator core 2 having a cylindrical shape.

  Here, the stator iron core 2, and the rotor iron core 6, the stator coil 8, the rotor coil 5, and other components constituting the rotary electric machine are stored in a main body frame 9 and are referred to as a rotary electric machine main body 10. A fan 11 is attached to the rotor 7 inside the rotating electrical machine main body 10, and the fan 11 rotates as the rotor 7 rotates. The fan 11 receives the cooling air cooled by the cooler 13 from the rotor shaft end side of the main body frame. Suction and discharge toward the center of the rotating electrical machine main body 10. By the action of the fan 11, the cooling air passes through the air gap 12 and the ventilation duct 2 a provided in the stator core 2, and takes heat of each part of the rotating electrical machine main body 10 to cool the stator coil 8 and the rotor coil 5. ing.

  The cooling air whose temperature has risen due to the removal of heat from each part is cooled again by the cooler 13 and then returns to the suction side of the fan 11 through the fan front chamber 9a.

Next, cooling ventilation of the fully closed AC exciter 4 will be described.
The fully closed AC exciter 4 includes a field iron core 14, a field coil 15, an armature core 16 attached to the shaft end of the rotor 7, and an armature coil 17 attached to the armature iron core 16. The rectifier 18 and the rectifier mounting plate 19 that fixes the rectifier 18 to the rotor 7 are configured. The exhaust duct 20 and the air supply duct 21 provided in the common base 1 take in a part of the cooling air of the rotating electrical machine main body 10 and ventilate the cooling air into the fully closed AC exciter 4, so that the field iron core 14. This is a duct for cooling the devices constituting the fully closed AC exciter 4 such as the armature core 16 and the field coil 15 and returning the cooled air to the rotating electrical machine main body 10 side.

  The fan front chamber 9 a is a space facing the fan, and a partition plate 22 that partitions so as to be orthogonal to the axial direction of the rotor 7 and a reinforcing plate 23 that partitions the common base 1 so as to be orthogonal to the axial direction of the rotor 7. The fan guide 28 and the main body frame 9 constitute a relatively narrow space. Further, between the fully closed AC exciter 4 and the fan front room 9 a in the main body frame 9, an exhaust duct 20, an exhaust port 20 a that is an opening of the air supply duct 21 on the rotating electrical machine main body 10 side, and a supply air The air opening 21a is opened, and the air supply port 21a is provided on the upstream side and the exhaust port 20a is provided on the downstream side with respect to the flow of the cooling air. Since the cooling air passing through the fan front room 9a, which is a narrow space, has a high flow velocity, the air supply port 21a and the exhaust port 20a have their openings opposite to each other, and the cooling air flows in the air supply port 21a. The cooling air generates a dynamic pressure at the air supply port 21a, and the cooling air is taken into the air supply duct 21 by the dynamic pressure.

  Further, the exhaust port 20a is installed in the same direction as the flow of the cooling air, and is located closer to the fan 11 than the air supply port 21a. Since a pressure loss is generated in the fan front chamber 9a due to the flow of the cooling air, the pressure on the air supply port 21a on the upstream side is higher than that on the exhaust port 20a on the downstream side, and the air supply ports 21a and 20a There is a static pressure difference between the two. This static pressure difference also generates a flow of cooling air from the air supply port 21a toward the exhaust port 20a.

  As described above, the fan inlet chamber 9a is configured to be a narrow space, and the flow velocity of the cooling air flowing in the space is increased, so that the dynamic pressure generated in the air supply port 21a and the air supply port 21a and the exhaust port are increased. The cooling air of the rotating electrical machine main body 10 is circulated to the fully closed AC exciter 4 using the static pressure difference of 20a.

Japanese Patent Laid-Open No. 5-91695

  In the above prior art, in order to circulate cooling air to the fully closed AC exciter 4, the flow path of the fan front chamber 9a surrounded by the partition plate 22, the reinforcing plate 23, and the main body frame 9 is narrowed. The flow velocity of the cooling air is increased and the difference between the dynamic pressure and the static pressure is utilized, but the pressure loss increases by increasing the flow velocity. As a result, the amount of cooling air generated by the fan 11 is reduced, the stator coil 8 and the rotor coil 5 are not sufficiently cooled, and the temperature thereof is increased, so that there is a problem that the life of the rotating electrical machine main body 10 is reduced due to poor insulation. .

  FIG. 4 is an enlarged view showing the flow of the fan 11, the fan front room 9a, and the cooling air in FIG. According to FIGS. 3 and 4, in the fan front chamber 9 a in which both the exhaust port 20 a and the air supply port 21 a are present, the flow is such that the partition plate 22 is wound in the inlet portion of the fan 11. Since it is fast, flow separation occurs, and inflow air becomes uneven. A periodic vortex is generated by the separation of the flow, and a periodic force (fluctuating fluid force) is generated by the vortex moving along the flow and hitting the blade 24 of the fan 11. Since such a fluctuating fluid force has periodicity, a resonance phenomenon occurs in the blade 24, and a large vibration stress is generated in the blade 24 even if the fluctuating fluid force is small. If the operation is continued for a long time, the blade may be damaged due to fatigue, and the long-term reliability is impaired.

  The present invention has been made to solve the above problems, and can supply and circulate a sufficient amount of cooling air to the rotating electrical machine main body and the fully closed AC exciter, and is a fully closed type with a cooler excellent in long-term reliability. An object is to provide a brushless rotating electrical machine.

A fully-closed brushless rotating electrical machine with a cooler according to the present invention includes a fully-closed brushless rotating electrical machine body with a cooler, a fan provided in the rotating electrical machine body, and a fully-closed AC that is cooled by cooling air of the rotating electrical machine body. In a fully-closed brushless rotating electrical machine with a cooler comprising an exciter and a common base having a hollow portion on which the rotating electrical machine main body and the fully-closed AC exciter are mounted, the fully-closed AC exciter includes a blower mechanism. The air supply passage for guiding the cooling air from the rotating electrical machine main body to the fully closed AC exciter and the exhaust air passage for returning the cooling air from the fully closed AC exciter to the rotating electrical machine main body are hollow portions in the common base . The air supply ventilation path extends along the rotor axial direction of the rotating electrical machine main body, and the air supply opening of the ventilation path extends radially from the rotor axis where the cooling air pressure is high. Away Provided the position, the exhaust air passage is extends along the rotor axis direction of the rotary electric machine main body, the outlet of the vent air passage is open so as to face the suction port side of the pressure of the cooling air is low the fan , The pressure difference generated between the air supply port and the exhaust port, and the suction and push-out action by the air-blowing mechanism of the fully-closed AC exciter, so that the cooling air of the rotating machine main body is cooled by the air supply and exhaust ventilation paths. Cooling is performed by circulating to a fully closed AC exciter through a path .

  According to the present invention, the above configuration can reduce the pressure loss of the cooling air passage, and can supply and circulate a sufficient amount of cooling air to the rotating electrical machine main body and the fully closed AC exciter. And the temperature rise of a rotor coil is reduced, and the fall of the lifetime of a fully-closed brushless rotating electrical machine with a cooler can be prevented. Further, by reducing the flow velocity of the cooling air at the fan inflow portion and reducing the vibration of the fan blade caused by the fluctuating fluid force, the blade can be prevented from being damaged.

The longitudinal cross-sectional view of the fully-closed brushless rotating electrical machine with a cooler which concerns on embodiment of this invention. 1A-A direction sectional view. The longitudinal cross-sectional view of the conventional fully enclosed brushless rotary electric machine with a cooler. The schematic diagram which shows the flow of the cooling air of the fan in FIG. 3, and a fan front room.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
(Constitution)
A fully-closed brushless rotating electrical machine with a cooler according to an embodiment of the present invention will be described with reference to FIGS.

  A fully-closed brushless rotating electrical machine with a cooler according to an embodiment of the present invention includes a frame 9 of a rotating electrical machine body, a rotor 7, a fully-closed AC exciter 4, a rotating electrical machine body, as in FIG. 3 showing a conventional rotating electrical machine. Fan 11, fan guide 28, bearing 3 for supporting the rotor, stator coil 8, and stator core 2. Further, the stator iron core 2, the bearing 3, and the fully closed AC exciter 4 are installed on the common base 1, and the cooler 13 is provided on the main body frame 9. FIG. Same as 3. Further, the configuration of the fully closed AC exciter 4 itself is the same as that of FIG. 3 showing the conventional fully closed AC exciter.

  In the present embodiment, the fan front room 9 a of the main body frame 9 and the fully closed AC exciter 4 are connected by a supply air passage 31 and an exhaust ventilation passage 32 provided in the common base 1. Further, the flow path of the fan front chamber 9a can be set wider than the conventional one by the fan guide 28 and the main body frame 9, and the pressure loss of the cooling air passage can be reduced.

  As shown in FIG. 2, the exhaust ventilation path 32 is a ventilation path for returning the air that has cooled the fully-closed AC exciter 4 to the rotating electrical machine body 10, and the rotor 7 of the rotating electrical machine body 10 from the exhaust opening 32 b. It extends in parallel along the axial direction. The exhaust port 32a through which the cooling air is discharged is opened facing the suction port side of the fan 11, and is provided, for example, at a position inside the outer diameter of the fan 11 provided in the rotating electrical machine main body.

  On the other hand, the air supply passage 31 is a ventilation passage that takes in the cooling air from the rotating electrical machine main body 10 and supplies the air to the fully-closed AC exciter 4. Are extended in parallel along the rotor axial direction, and are formed in an L shape as shown in FIG. The air supply port 31a for supplying cooling air is provided on the common base, and is provided at a position perpendicular to the axial direction of the rotor 7 and away from the shaft in the radial direction, for example, in the rotating electrical machine main body. A fan-shaped partition plate 26 is provided at a position exceeding the outer diameter of the fan 11.

  The supply air passage 31 and the exhaust air passage 32 are formed on a common base. Specifically, a space surrounded by a base upper plate 1a and a base lower plate 1b constituting the common base 1 and a rib 1c connecting the base upper plate 1a and the base lower plate 1b is an L-shaped partition plate. It is formed by partitioning with 25.

  In the fully closed AC exciter 4, a centrifugal fan 27 is attached as an air blowing mechanism to the end of the rectifier mounting plate 19 to which the rectifier 18 is attached, and the base upper plate 1 a where the centrifugal fan 27 is located is fully closed. An exhaust opening 32b through which cooling air circulated in the AC exciter 4 is discharged is provided. In addition, an air supply opening through which cooling air circulating in the fully closed AC exciter 4 is supplied to a position on the supply air passage 31 in the base upper plate 1a where the fully closed AC exciter 4 is located. 31b is provided.

(Function)
Next, the operation of this embodiment will be described.
The broken lines indicated by the arrows in FIGS. 1 and 2 indicate the flow of cooling air. The fan 11 provided in the rotor 7 rotates with the rotation of the rotor 7, and the cooling air from the cooler 13 of the main body frame 9 is partly divided as shown in FIG. Then, the rotor 7 is cooled to flow into the air gap 12 between the stator iron core 2 and the rotor 7, and each part is cooled through the ventilation duct 2 a of the stator iron core 2. . Here, since the cooling air causes a pressure loss as it passes through the ventilation path of each part of the rotating electrical machine main body 10, the front of the fan 11 has a maximum negative pressure.

  On the other hand, in order to cool the fully-closed AC exciter 4, a part of the cooling air from the cooler 13 is flowed and bypassed. As a result of the diversion, the flow speed becomes slow, but in order to compensate for this, the cooling air inside the fully closed AC exciter 4 is pushed out from the exhaust opening 32b by the centrifugal fan 27 in the fully closed AC exciter 4, and a constant flow rate is maintained. Can be secured. The extruded cooling air passes through the exhaust ventilation path 32 extending parallel to the rotor axial direction of the rotating electrical machine main body, faces the fan suction port side, and opens to the base upper plate 1a on the common base. 32a is discharged into the fan front room 9a.

  Further, the cooling air divided for the fully closed AC exciter 4 opens in a direction perpendicular to the rotor axial direction of the rotating electrical machine main body, is a base upper plate 1a on the common base, and is outside the fan. The air is taken in from an air supply port 31a provided at a position exceeding the diameter, and is drawn into the fully closed AC exciter 4 from the supply air opening 31b through the supply air ventilation path 31, and the cooling air is fully closed AC excitation. The interior of the machine 4 is ventilated to cool the field core 14 and the armature core 16.

  Here, the exhaust port 32a is opened on the suction side in front of the fan 11 having the lowest cooling air pressure inside the rotating electrical machine, while the air supply port 31a is separated in the radial direction with respect to the axial direction of the rotor 7. Since the opening is opened at a position, for example, a position exceeding the outer diameter of the fan, the pressure of the cooling air is higher than that of the exhaust port 32a opened at a position inside the outer diameter of the fan. And the pressure difference generated between the exhaust port 32a and the suction and push-out action of the cooling air by the centrifugal fan 27 provided in the fully-closed AC exciter 4 are sufficient for the interior of the fully-closed AC exciter 4 as well. A quantity of cooling air is taken in and discharged.

  Further, the exhaust ventilation path 32 extends along the rotor axial direction of the rotating electrical machine main body, and the exhaust port 32a is opened facing the suction port side of the fan having the maximum negative pressure. It is exhausted at a flow rate that flows linearly and does not cause pressure loss.

(effect)
As described above, according to the present embodiment, the air supply ventilation path 31 formed in an L shape, the exhaust ventilation path 32 formed in a linear shape, and the blower fan 27 provided in the fully closed AC exciter 4, The pressure loss generated in the fan front chamber 9a can be made smaller than the conventional one without taking a relatively large flow path in the fan front chamber 9a and increasing the flow velocity of the cooling air. The air volume of the cooling air sent to the AC exciter 4 is increased as compared with the conventional one, the temperature rise of the stator coil and the rotor coil is reduced, and the life of the rotating electrical machine main body 10 can be extended. Further, since the flow velocity in the fan front chamber 9a is reduced, the flow separation at the inflow portion of the fan 11 does not occur, so that the blade 24 is not vibrated and the long-term reliability of the blade 24 is increased. Can do. Moreover, since the flow path of the fan front chamber 9a is relatively wide, it is not necessary to increase the blowing capacity of the fan of the rotating electrical machine main body as compared with the conventional one. Further, it is not necessary to pipe a duct for air supply / exhaust in the common base, and the air supply / exhaust air passage 31 and the exhaust air passage 32 can be formed only by partitioning the common base with a partition plate.

  DESCRIPTION OF SYMBOLS 1 ... Common base, 1a ... Base upper plate, 1b ... Base lower plate, 1c ... Rib, 2 ... Stator iron core, 3 ... Bearing, 4 ... Fully closed AC exciter, 5 ... Rotor coil, 6 ... Rotor iron core, 7 DESCRIPTION OF SYMBOLS ... Rotor, 8 ... Stator coil, 9 ... Main body frame, 10 ... Rotary electric machine main body, 11 ... Fan, 12 ... Air gap, 13 ... Cooler, 14 ... Field iron core, 15 ... Field coil, 16 ... Armature iron core, DESCRIPTION OF SYMBOLS 17 ... Armature coil, 18 ... Rectifier, 19 ... Rectifier mounting plate, 20 ... Exhaust duct, 20a ... Exhaust port, 21 ... Air supply duct, 21a ... Air supply port, 22, 25, 26 ... Partition plate, 23 ... Reinforcement Plate, 24 ... Blade, 27 ... Centrifugal fan, 28 ... Fan guide, 31 ... Supply air passage, 31a ... Supply air port, 31b ... Supply air opening, 32 ... Exhaust air passage, 32a ... Exhaust port, 32b ... Exhaust air Aperture.

Claims (4)

A fully-closed brushless rotating electrical machine body with a cooler, a fan provided in the rotating electrical machine body, a fully-closed AC exciter cooled by cooling air of the rotating electrical machine body, the rotating electrical machine body and the fully-closed AC In a fully-closed brushless rotating electrical machine with a cooler consisting of a common base having a hollow part on which an exciter is mounted,
The fully closed AC exciter includes a blower mechanism,
An air supply passage that leads cooling air from the rotating electrical machine main body to the fully-closed AC exciter and an exhaust air passage that returns cooling air from the fully-closed AC exciter to the rotating electrical machine main body are hollow portions in the common base . Formed by partitioning with a partition plate ,
The air supply passage extends along the rotor axial direction of the rotating electrical machine body, and the air supply port of the air passage is provided at a position radially away from the rotor shaft where the pressure of the cooling air is high,
The exhaust ventilation path extends along the rotor axial direction of the rotating electrical machine main body, and the exhaust opening of the ventilation path opens to the suction inlet side of the fan where the pressure of the cooling air is low ,
Due to the pressure difference generated between the air supply port and the exhaust port, and the suction and push-out action of the fully-closed AC exciter air blowing mechanism, the cooling air of the rotating machine main body is cooled by the air supply and exhaust air passages. A fully-closed brushless rotating electrical machine with a cooler, which is circulated to a fully-closed AC exciter through a fan and cooled .   The air supply passage is formed in an L shape from an air supply opening opened in a direction perpendicular to the rotor axial direction of the rotating electrical machine body toward the air supply opening of the fully closed AC exciter. The fully-closed brushless rotating electrical machine with a cooler according to claim 1.   The fully-closed brushless rotating electrical machine with a cooler according to claim 2, wherein the air supply port is formed at a position exceeding an outer diameter of the fan.   The fully-closed brushless rotating electrical machine with a cooler according to claim 2 or 3, wherein the air supply port is formed on the common base.

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