JPH04340347A - Salient-pole type rotary electric apparatus - Google Patents

Abstract

PURPOSE:To provide a salient-pole type rotary electric apparatus equipped with separated ventilating systems which separate the cooling ventilating systems for a stator and a rotator. CONSTITUTION:A stator chamber 37 is provided to enclose a stator. An air cooler 14 is arranged to cool air when the air in this stator chamber 37 is exhausted outside the stator chamber by the fanning action of the rotator itself. An electric fan 1 is provided to discharge the air thus cooled by the air cooler 14 into the stator chamber 37 by sending it to the back of the stator core as a forced-cooling air. An interpole partition board 33 is arranged to guide to the stator chamber 37 the discharged flow of the cooling air which is sent to the rotator by the fanning action of the rotator itself so that this discharged flow does not collide against the exhausing flow from the stator.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a salient pole type rotating electric machine which is equipped with an electric fan for forced cooling and ventilation, and which performs separate ventilation between a stator and a rotor.

0002

2. Description of the Related Art Generally, a generator motor installed in a pumped storage power plant is cooled by air circulation, and a ventilation system is adopted in which the cooling air is circulated by a separately installed electric fan for forced cooling ventilation.

[0003] In the case of this ventilation system, the cooling air inside the aircraft is
As shown in FIG. 3, the air flows into the stator frame 2 by the forced cooling ventilation electric fan 1 and is guided into the space between the magnetic poles 3. Also, a part of the cooling air flows into the rotor spider 4 from a ventilation hole 5 provided in the rotor spider 4, passes through a flow path 7 provided in the rotor rim 6, and enters the space between the magnetic poles 3. be guided. While the cooling air flows through the space between the magnetic poles,
The cooling air then crosses the air gap 10 into the stator duct 11 of the stator core 13 and, while passing through the stator duct 11, cools the field coil 8 and the pole core 9. and cools the stator core 13. Next, an air cooler 14 provided on the outer periphery of the stator frame 2
Heat is removed and the cooling air is recirculated.

[0004] In this way, in this ventilation system, the air that cools the stator first flows inside the rotor and then crosses the air gap 10, so that it is heated by rotor loss before it reaches the stator. Become. Therefore, a large amount of airflow was required to obtain the necessary cooling effect on the stator. Furthermore, since a large amount of airflow flows and cooling air flows into the space between the magnetic poles from various ventilation circuits, there is a drawback that wind loss due to mutual interference is large and the efficiency of the main engine is reduced.

[0005] As a result, in ultra-high-speed, large-capacity generator motors with rotor circumferential speeds exceeding 130 m/s, even larger air volumes are required, making it impossible to secure the required ventilation area. Therefore, with this ventilation method, it is no longer possible to flow the required amount of cooling air, and a method has been adopted in which cooling fluid is flowed directly into the rotor coil, that is, the field coil 8 or the stator coil 12 for cooling. In other words, the direct cooling method, which has a complicated structure and is expensive, has to be adopted.

[0006] To solve this problem, there is also a salient pole type rotating electrical machine that allows the stator and rotor to be ventilated separately, thereby increasing the capacity without employing a direct cooling system.

FIG. 4 is a sectional view showing such a salient pole type rotating electric machine. As shown in the figure, a cylindrical ventilation partition wall 32 is formed on the inner diameter side of the stator to separate the stator core 13, the stator coils 12 within the core, and the rotor ventilation system. The stator frame 2 is circumferentially partitioned into a plurality of chambers, and a forced cooling electric fan 1a and an air cooler 14a are arranged on the outer peripheral surface of the stator frame 2 so as to alternately distribute power to each partitioned chamber. ing. Further, a plurality of forced cooling electric fans 1b are arranged on the upper outer peripheral surface of the stator frame 2, and a plurality of air coolers 14b are arranged on the lower outer peripheral surface of the stator frame 2.

[0008] Furthermore, the rotor spider 4 is not provided with ventilation holes 5, and the rotor rim 6 is not provided with any flow passages.

In the case of this ventilation method, air for cooling the rotor flows into the stator frame 2 by a forced cooling electric fan 1b, cools the upper stator coil end 12a, and then flows into the space between the magnetic poles 3. The cooling air enters the space and blows through this space from top to bottom in the axial direction, cooling the field coil 8 and the magnetic pole iron core 9 of the magnetic pole 3 while flowing through the space between the magnetic poles. The cooling air that cooled the lower stator coil end 12b was then recirculated after releasing heat while passing through the air cooler 14b.

On the other hand, as shown in FIG. 5, air for cooling the stator core 13 and the stator coils 12 in the core flows into the stator frame inflow section 22 by the forced cooling electric fan 1a, and It enters the child duct 11 and flows from the outside to the inside in the radial direction. The stator coils 12 and stator core 13 in the inlet section 22 are cooled while passing through this stator duct. Next, the cooling air flows into a chamber 23 formed on the inner diameter side of the stator by a cylindrical ventilation partition wall 32.
It flows circumferentially into the stator duct 11 of the outflow section 24 and flows radially from the inside to the outside. While passing through this stator duct 11, the stator coil 12 and stator core 13 in the outflow section are cooled. The cooling air then flows out into the stator frame outflow section 25 and is recirculated after releasing heat while passing through the air cooler 14a.

[0011]

[Problems to be Solved by the Invention] Here, this salient pole type rotating electric machine is characterized in that the stator is divided into an air supply chamber and an exhaust chamber in the circumferential direction. Recent research has revealed that there are problems.

That is, if the stator is partitioned circumferentially or axially into an air supply chamber and an exhaust chamber, a temperature imbalance occurs in the circumferential or axial direction. In particular, it has become clear that there is a risk that the temperature of the stator coil 12 on the exhaust chamber side may rise abnormally.

SUMMARY OF THE INVENTION An object of the present invention is to provide a salient pole rotating electric machine equipped with a separate ventilation system in which cooling ventilation systems for the stator and rotor are separated to prevent temperature imbalance. [Structure of the invention]

[0014]

[Means for Solving the Problems] A salient pole rotating machine of the present invention has a rotor formed with protruding magnetic poles and a stator provided on the outer peripheral side of the rotor and supported by a stator frame. In a polar rotating machine, there is a stator partition plate that surrounds the stator together with the stator frame to form a stator chamber, and a stator partition plate that is provided on the upper outer circumferential surface and lower circumferential surface of the stator frame and that allows the air in the stator chamber to flow into the rotor. An air cooler that cools the air when it is discharged outside the stator room by its own fan action, and an air cooler that is installed on the outer peripheral surface of the center of the stator frame to cool the air that is cooled by the air cooler at the back of the stator core. An electric fan that blows forced cooling air to the stator chamber and discharges the cooling air to the stator chamber, and an air cooler guided to the rotor by the rotor's own fan action to discharge the cooled air from the stator. and a pole partition plate that guides the exhaust flow into the stator chamber so as not to collide with it.

[0015]

[Operation] As a result, the salient pole type rotor is made into a cylindrical shape by the pole partition plate, and the ventilation systems of the stator and rotor are separated. Then, all the cooling air is ventilated from the outer diameter side toward the inner diameter side. As a ventilation source for cooling air, the stator uses a forced cooling electric fan, while the rotor uses its own fan action.

Therefore, there is no temperature imbalance in the stator in the circumferential or axial direction, and the stator core and stator coils are uniformly cooled.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view of a salient pole type rotating electrical machine showing one embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. As shown in the figure, the stator frame 2 and the stator partition plate 36 surround the stator to form a stator chamber 37.

On the other hand, the salient pole rotor is formed into a cylindrical shape by a pole partition plate 33, and the ventilation systems of the stator and rotor are separated. As shown in FIG. 2, a chamber 35 is provided within the stator frame 2 on the back surface of the stator core 13 (hereinafter referred to as core back 34).

A plurality of forced cooling electric fans 1 are disposed on the outer peripheral surface of the stator frame 2 in the core back chamber 35 portion, and are configured to feed cooling air into the chamber 35 from the outside. Therefore, all chambers 35 become air supply chambers.

Next, a plurality of air coolers 14a are arranged on the upper outer peripheral surface of the stator frame 2. Also, a plurality of air coolers 14b are arranged on the lower outer peripheral surface of the fixed frame 2.

Here, the electric fan 1 is assumed to be the source of cooling air for the stator. On the other hand, the rotor's cooling air source uses the rotor's own fan action. First, cooling air for the stator is supplied to the chamber 3 of the stator frame 2 by an electric fan 1.
5.

Next, it enters the stator duct 11 and cools the stator coil 12 and stator core 13 while passing through the stator duct 11. Then, the cooling air flows out into the air gap 10, hits the pole partition plate 33, separates upward and downward in the axial direction, and enters the coil end portion of the stator chamber 37. Next, an air cooler 14 provided on the outer periphery of the stator frame 2
While passing through a, 14b, heat is removed and the cooling air is recirculated.

On the other hand, the rotor cooling air flows into the rotor spider 4 from the ventilation hole 5 provided in the rotor spider 4, passes through the flow path 7 provided in the rotor rim 6, and reaches the magnetic pole 3.
guided to the space between.

Next, the cooling air is separated upward and downward in the axial direction, cools the field coil 8 and the magnetic pole core 9 while flowing through the space between the magnetic poles, and then hits the pole partition plate 33 and flows inside the stator chamber 37. into the upper and lower coil ends. Here, it merges with the cooling air of the stator, heat is removed while passing through air coolers 14a, 14b provided on the outer periphery of the stator frame 2, and the cooling air is recirculated.

Now, the air specific heat is Cγ, the air specific weight is γ,
If the total loss of the conventional method is L0, the air volume is Q0, and the air temperature rise is △t0, then from the balance of heat amount
L0 = Q0 ・△t0 ・Cγ・γ ……………
………………………(1) holds true. On the other hand, the air volume required to cool the rotor according to the present invention is Q1,
The loss incurred by this air volume Q1 is L1, the temperature rise of the air at that time is Δt1, the air volume required to cool the stator is Q2, and the loss incurred by this air volume Q2 is L2.
, if the temperature rise of the air at that time is △t2, then L1 = Q1 ・△t1 ・Cγ・γ
…………………………………(2) L2 =
Q2 ・△t2 ・Cγ・γ …………………………
...(3). Also, since the total loss does not change, L0 = L1 + L2 ………………
…………………………………(4) holds true. In the conventional system, the air temperature rise Δt0 is the sum of the temperature rise due to rotor loss and the temperature rise due to stator loss, because the air that cools the stator first flows inside the rotor. If the stator and rotor are separated and ventilated, the temperature rise of each air can be allowed up to △t0, so △t0 = △t1 = △t2 ......
…………………………………(5). Therefore, from equations (1) to (5), Q0 = Q1 + Q
2 holds true. Normal L1 =0.4・L0, L2 =0.6・L0
Therefore, the air volume required to cool the rotor is
This means that the reduction is only 40% compared to the conventional method. Also, the amount of air required to cool the stator is 60% lower than that of the conventional method.
% would be fine.

FIG. 6 shows ventilation characteristic curves according to the conventional method and the present invention, where curve 26 shows the ventilation resistance of the conventional method, curve 27 shows the ventilation resistance of the rotor side ventilation circuit according to the invention, and curve 28 shows the ventilation resistance of the stator side ventilation circuit. It is the ventilation resistance of the circuit. When the stator and rotor are ventilated separately as shown in FIG. 6, the ventilation resistance of each becomes smaller than in the conventional system. At this time, in the conventional system, the pressure generation side PQ characteristic required to generate each of the air volumes Q0, Q1, and Q2 is curve 29.
, a curve 30 on the rotor side and a curve 31 on the stator side according to the present invention. The intersection of this pressure generation side PQ characteristic curve and the ventilation characteristic curve becomes the operating point for each air volume Q0, Q1,
The pressures corresponding to Q2 are the pressures P0, P1, and P, respectively.
It becomes 2. Normally, ventilation resistance increases in proportion to approximately the square of the air volume.

As is clear from FIG. 6, the ventilation resistance curve 27
and 28 are below the conventional ventilation resistance curve 26, so the required pressures P1 and P2 are as follows. The power W for generating these air volumes and pressures is proportional to the product of P and Q, so the power of the conventional method is
Then, from equations (6) and (8), the power W1 on the rotation side and the power W2 on the stator side according to the present invention are respectively W1 < 0.43 ・W0 W2 < 0.63 ・W0, and both The sum is W1 +W2 <0.28·W0. From the above analysis results, in the embodiment of the present invention,
The required power is less than 30% compared to the conventional method, which is a significant reduction in power.

[0028]

Effects of the Invention As explained above, in the conventional system, the air for cooling the rotor first flows through the rotor and is heated by rotor loss before reaching the stator. However, by separating the rotor and stator and ventilating them, cold air enters the stator, reducing the amount of air required to cool the stator. This works so that the amount of energy required can be significantly reduced. Therefore, the flow velocity of the cooling air flowing inside the stator is reduced, which acts to reduce ventilation resistance. Furthermore, the conventional method requires a large-power forced cooling electric fan, but a small-power fan is required.

On the other hand, since the rotor is also ventilated separately from the stator, the amount of air required to cool the rotor can be significantly reduced.

In other words, there is no temperature imbalance in the stator in the circumferential or axial direction, and the stator core and stator coils are uniformly cooled. Furthermore, since the stator and rotor are effectively ventilated separately, the amount of cooling air flowing through each can be reduced, and windage loss can also be reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of a main body.

FIG. 2 is a sectional view taken along line AA in FIG. 1;

FIG. 3 is a sectional view showing a conventional example.

FIG. 4 is a sectional view showing another conventional example.

FIG. 5 is a sectional view taken along line BB in FIG. 4;

FIG. 6 is a ventilation characteristic curve diagram of the present invention and a conventional example.

[Explanation of symbols]

1 Electric fan 2 Stator frame 3 Magnetic pole 4 Rotor spider 5 Ventilation hole 6 Rotating rim 7 Channel 8 Field coil 9 Magnetic pole core 10 Air gap 11 Stator duct 12 Stator coil 13 Stator core 14 Air cooler 22 Fixed Child frame inflow section 23 Stator inner diameter side chamber 24 Inflow section 25 Stator frame outflow section 32 Ventilation partition wall 33 Pole partition plate 34 Core back 35 Core back chamber 36 Stator partition plate 37 Stator chamber

Claims (1)

[Claims] 1. A salient pole type rotating machine having a rotor formed with protruding magnetic poles and a stator provided on the outer peripheral side of the rotor and supported by a stator frame, wherein the stator is connected to the stator. A stator partition plate surrounds the stator chamber together with the frame to form a stator chamber, and a stator partition plate is provided on the upper outer circumferential surface and lower circumferential surface of the stator frame, and air in the stator chamber is provided to the stator by the fan action of the rotor itself. An air cooler is provided to cool the air when it is discharged outdoors, and a forced cooling air is provided at the outer peripheral surface of the central part of the stator frame to direct the air cooled by the air cooler to the back of the iron core of the stator. an electric fan that ventilates the air and discharges the cooling air into the stator chamber; and an electric fan that discharges the cooling air into the stator chamber, and the air cooled by the air cooler guided to the rotor by the rotor's own fan action is discharged from the stator. a salient pole type rotating electrical machine, comprising a pole partition plate that guides the discharge flow into the stator chamber so as not to collide with the discharge flow from the stator chamber.