JPS58212342A - Cooler for synchronous rotary electric machine - Google Patents

Abstract

PURPOSE:To reduce the power of a cooling fan and to improve the cooling efficiency of a rotary electric machine by cooling the coil of the machine via cooling fans provided individually from the machine in response to the load which is compensated for the temperature of the coil. CONSTITUTION:A cylinder 12 for forming a circulating air passage 11 which passes through the body casing 10 of a generator 7 is stood, and an axial cooling fan 13 for cooling the coil of the generator and a cooler 14 are installed in the cylinder. Cooling air is produced by the fan 13, cooled by the cooler 14, passed from an opening 15 formed at the bottom side of the cylinder 12 through the air flow passage 16 between a foundation 8 and the cylinder 12, raised, and circulated through a circulating passage 11 which returns from an exhaust port 18 into the cylinder 12 after cooling the coil. Rotating exponential command signals e, f after compensating with temperature compensators 26, 31 are inputted to a selector 21, thereby controlling the rotating speed of a cooling fan 13.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a synchronous generator, a synchronous motor, etc.1. This is a device that cools down the temperature rise in the windings of a synchronous rotating machine by blowing air from a cooling fan.It takes into account winding temperature compensation and adjusts the amount of air blown by the cooling fan according to the load of the rotating machine, thereby saving energy. The present invention relates to a cooling device for a synchronous rotating machine that can be realized.

In the conventional Jinotane synchronous rotating machine, the cooling fan l is integrated with the shaft 4 of the rotor 3 of the synchronous rotating machine 2 [42
As shown in Fig. 2, the synchronous rotating machine 5
There is also one in which a cooling fan 6 is provided separately. In any case, the rotation of the synchronous rotating machine 2.5 is always controlled to be constant. Ninth, in the case shown in Fig. 1, the air flow rate of the cooling fan 1 of the synchronous rotating machine 2 is designed to cool the heat generated in the windings during maximum load to within a predetermined temperature range. Therefore, if the load acting on the rotary rotating machine 2 is light, more air cooling will be performed than necessary, and the power used to drive the cooling fan will be wasted accordingly. That's it. t7t%2
In the case of the cooling fan 6 shown in the figure, the air flow rate is set at a constant rotation speed to cool the heat generated in the windings during maximum load to within a predetermined temperature range. 90 In other words, in any case, conventional synchronous rotating machines waste electricity and are inefficient, contrary to energy saving. Ta.

In view of the above-mentioned drawbacks of the conventional technology, the present invention is an improvement on the above-mentioned drawbacks of the conventional technology. It is an object of the present invention to provide a cooling device for a synchronous rotating machine that realizes energy saving 1 by performing the cooling according to the load of the synchronous rotating machine.

The configuration of the present invention will be explained below based on the embodiments shown in the drawings.

! FIG. 3 is a diagram showing the entire structure of the apparatus of the present invention applied to a large-sized synchronous generator 7, and FIG. 4 is a block diagram thereof. The head of the synchronous generator 7F1 foundation 8KR is tilted so that a part of the main body casing lO fits into the vertical hole 9 ◇ Inside the vertical hole 9 1111 The circulation ventilation passage 11 passing through the inside of the synchronous generator 70 main body casing lO A cylindrical body 12 is erected for forming a synchronous generator 7.
An axial cooling fan 13 and a cooler 14 are installed for cooling the O winding. The air is blown up by the fan 13, cooled by the cooler 14, and rises from the opening 15 provided on the bottom side of the cylinder 12 into the air passage 161 between the foundation 8 and the cylinder 12, and then rises to the main body. A part of the bottom and side l of the casing 10 [enters the casing 10 through the two-digit inlet 17, cools the stator windings and rotor windings, and after death, is installed at the center bottom of the main body casing lO In this embodiment, as shown in FIG. It has block circuits 19 and 20 that detect the entire winding temperature and determine the rotation speed of the cooling fan 13, and a selector 21 selects the larger of the output signals e and f of the circuits 19 and 20. In the O circuit 19 which outputs to the rotation speed controller 22 and controls the rotation speed of the cooling fan 13, 24 is a detector for measuring the excitation current of the rotor winding, and 25 is detected by the detector 24. A computing unit 26 is a computing unit 250 that computes the rotation speed of the cooling fan 13 in response to the current or the signal a trap corresponding thereto.
Temperature compensation for correcting the rotation speed of the cooling fan 130 by comparing the temperature signal T of the rotor winding obtained by the rotation speed controller 1S (see Fig. 3) with the temperature If set value a. A current detector 28 detects the current flowing through the load 29 (see Fig. 3), and 30 indicates the current detected by the detector 28 or C current. Corresponding to the corresponding signal aVc, there is a cooling fan 130 rotation speed controller, and 31 is an arithmetic unit 300 rotation speed controller t.
1 The temperature of the stator winding 4MsT1 obtained by the temperature detector 27Vc is compared with the temperature set value β, and the temperature of the cooling fan 13 is
0 degree compensator 26 which is a temperature compensator for correcting the rotation speed of
．． The reason why 31 was established is as follows. That is, the temperature of the rotor and stator windings of the synchronous generator 70 may become higher than the temperature corresponding to the load due to disturbances such as ambient temperature or failure of the cooling fan ventilation system.

, the load acting on the synchronous generator 7 is determined by various signals a,
The rotational speed command signal b obtained by the calculator 25.30 by extracting only c, (it is insufficient to drive the cooling fan 13 in response to LK, so it is necessary to compensate by taking into account the temperature factor of the winding. This is because the detector 2 detects the temperature T0 and T1 of the rotor and stator windings.
7, for the stator winding, an electrical signal corresponding to the temperature can be obtained from a resistance temperature needle or thermocouple thermometer embedded in the winding, and for the rotor winding, in this example. (Synchronous generator), the resistance of the winding is calculated from the terminal voltage and current of the rotor winding, the temperature is determined from the resistance value, and an electrical signal corresponding to C resistance can be obtained.

Rotation speed command signal e after correction by temperature compensator 26.31
, f are input to the selector 21, where a signal with a large value is selected, and then the rotation speed controller 2 of the cooling fan 13 is input.
It is output as 2rcm number 2, converted into a frequency, etc., and controls the cooling fan 130 rotation speed by the signal hK.

The device of this embodiment cools the 70 windings of the synchronous generator with the above-described configuration and operating procedure, and under the conditions within the temperature range of a certain set value, The cooling fan power, that is, the power consumption for cooling the windings, can be significantly reduced compared to the case of . To explain this in more detail, in the conventional example shown in FIGS. 1 and 2, the air flow rate of the cooling fan 1.6 is as shown by the broken line in FIG. In order to cool the heat generated within a predetermined temperature range, the design is controlled to have the maximum power of the cooling fan, and the power of the cooling fan is always constant (maximum output) regardless of the weight or weight of the load. However, in the case of this embodiment, by cooling the windings in accordance with the load, it is possible to cool the windings to within a predetermined temperature range with a small air volume during light loads when the winding temperature is low. By changing the power of the cooling fan 13, efficient cooling can be performed (see the solid line in FIG. 5). This means that since the fan power P and the fan air volume Q have a relationship VC of p oc Q, 3, in this embodiment, P, oc R
” is obtained, and the cooling fan WJ force pl can be reduced by an amount proportional to the cube of the load R.
, This will also be considered from the perspective of the efficiency of the synchronous generator 7, and since the loss in equation (1) above includes the power of the cooling fan, the loss in equation (1) will be reduced. Therefore, the efficiency of the synchronous generator 7 can be significantly improved.

Incidentally, misfire #4 is not limited to the above example,
It is also applicable to synchronous motors, etc.

In summary, the present invention cools the windings of a synchronous rotating machine using a cooling fan installed separately from the rotating machine, in accordance with the load of the rotating machine, taking into account hot water temperature compensation for the windings. The power consumption of the cooling fan can be significantly reduced and the windings can be cooled completely without waste, and the power consumption is much lower than that of a conventional synchronous rotating machine with an integrated cooling fan. In other words, it is possible to provide a cooling device for a synchronous rotating machine that is excellent in energy saving.

[Brief explanation of the drawing]

Figures 1 and 2 are drawings showing this conventional food equipment,
Fig. 3 is a drawing showing the entire embodiment of the device according to the present invention, Fig. 4 is a block diagram thereof, and the fifth factor is a cooling fan power-load characteristic curve diagram comparing the conventional case and the case of the present invention. be. 7... Synchronous rotation (generator) machine 27... Hot water temperature detector 2
4.28... Load current detector lO... Casing 11... Ventilation path 13... Cooling fan patent applicant
Sumitomo Kinte Industries Co., Ltd. Agent Patent Attorney Toshihiko Uchida Figure 1 Figure 2

Claims (1)

[Claims] 1. A temperature detector that detects the temperature of the winding of the synchronous rotating machine;
a load current detector that measures the load acting on the rotating machine;
A cooling fan that is provided separately from the rotating machine and that cools the windings through a ventilation passage that communicates with the rotating machine casing, and is connected to signals from the load current detector and the temperature detector. A cooling device for a synchronous rotating machine, characterized in that the rotational speed of a cooling fan is controlled in association with the cooling fan.