SU811413A1 - Gas-cooled electric machine - Google Patents

Description

one

The invention relates to electrical engineering, in particular, to a device for controlled cooling of a synchronous machine, and can be used, for example, in turbogenerators, operating under conditions of a variable load curve.

The known design of an electric machine with variable intensity of cooling of active and structural elements at increased heat generation in these elements 1. This machine contains cooling channels in active and structural elements, an independent reservoir of pressurized refrigerant, a regulator, a regulator connected to the regulator by its organ. The regulator controls the regulator, its organ from the program relay, or the signals from the stator current sensor. However, this electric machine can operate with increased heat generation only in a short-time mode determined by the volume of the high-pressure reservoir in which there is an additional portion of the refrigerant. In addition, the presence outside the turbogenerator of a large number of additional elements of the cooling system: a high-pressure tank, hydraulic and electric regulators, pumps, filters, tenlo-exchangers, etc. — leads to a significant increase in the export cost.

Also known is an electric machine, which contains, and a hermetic housing, a stator core with gas cooling and divided by radial ventilation channels into packages, a gas distribution cylinder with through holes, located by a housing and a stator core, a rotor with ventilation channels, a compressor on the rotor shaft, an outlet which is connected to the said ventilation ducts of the rotor 2. The necessary pressure for the circulation of gas cooling the stator core is created by an axial fan.

However, this design can provide stable and thermally stable operation of an electric machine only for a certain level of losses in active and structural elements, for example, for the nominal mode. When the power factor changes in the range of 0.95-1.0, the heating of the outermost packet of the stator core increases significantly, and in a number of cases it reaches its limiting value (due to an increase in losses in the outermost packets at the same cooling intensity).

In addition, the unevenness of the active-reactive load schedule leads to

cyclical variations of the temperature of the generator structural elements, iix mutual non-displacement relative to each other, and consequently, lead to accelerated wear, loss of life, reliability, and) load capacity of the electrical system M;

The purpose of the invention is to eliminate these drawbacks, the increase in .IOHJ, HOST and operational reliability and durability of the turbogenerator under conditions of a time-consuming load curve, in particular, the generator with nominal active power and the use of reactive power from the network.

For this, the well-known electric machine is equipped with an additional pipeline that communicates the room through the openings of the gas cylinder of the first cylinder with radial channels;

Completion of the additional gas supply path in the electric machine to the ventilation channels of the coic jackets of the stator core with a regulating back-up, which with the aid of the regulator iodine the ground gas in the inverse normal dependence on the excitation current of the rotor, could not even redistribute the cooling currents inside the generator in such a way that Kpaiimix nakket practically remains unchanged. The required coolant gas regulator from the rotor required for these purposes, as in the mode of reactive power consumption, its tenl mode is facilitated due to reduction and loss and winding of the rotor, but therefore part of the gas supplied to the rotor ventilation channels can be used to cool the extreme sticks .

In the drawing, a schematic representation of an electric machine with an adjustable cooling rate of end packs of a stator core.

The electric machine contains a pressurized cornea 1, a stator core 2, radial ventilation channels 3 stator cores, pads 4, a gas separation cylinder 5 with through holes 6, a rotor 7 with axial 8 n radial 9 ventilation channels, which are connected via gas pipes 10 the output of the compressor 11 on the rotor shaft. The rotor excitation winding 12 is connected to the power supply system of the generator winding through the contact rings 13. The output of the ventilation channels 9 of the rotor is connected to the gap 14 between the rotor and the stator. Additional gas supply path 15 to radial ventilation ducts 3 stator cores and to ducts

Hi between the Ilysim f.antse.m. 17 and the extreme package | 1 () dsoyedy) 1en to (hg 18 through hole 19 in the partition 20. To (g 19 19), the axial axial channels 21; H) 1st channels of 21 stator cores. Regulus; | ru i1ts; I sat; kl1ka 22 iodoed; va11a k): s | (), P111 teliomiu mekhaiizmu 2.5 prs yurtsio1; aly1g; - 111tgralio dneprepiialy reg; 1I1ora 24. To the regulating device

25 of the controller 24 G1connection11 current sensor 26 {S1N-perturbation), installed in the circuit excited 1 poTcjpa, n temperature sensor 27 (deviation signal), set. eeep 1 in zones 28 max 1: ma,: 1 nyh

temperature end packs. Inlet 29 of the supply path of additional gas supply) is connected to the inlet to the fan: 1 canopies,: | s 8 rotors. The inlet 29 of the additional gas supply path can be directly connected to the compressor 11.

The 1 .machine with variable cooling intensity works as follows.

An increase in the power factor value of the nrn IOSTOYA1P10M, as well as an increase in the active power, causes an increase in losses in the extreme packets of the stator core. When in the rotor, as the current of the current () is decreased, wait for 1 and the origin of the reduction of luJTepi.

.: | the torus 24 is given to the signal, and it starts from the sensor 26, uirav, 1 et sec. 1 () nk (22 and in accordance with the value, backwardly, of the rotor current.

At a current of excitation 1, iomipalpomu (t, i ,, M), the valve 22 is closed; nrn current / (iiiiii valve 22 is fully open. At current, the end flaps are cooled by a steady gas flow, Iostui O1i, e1 (; from 1 cent of channel 21). In a range of currents up to the value of currents - niiii the regulator sends to the extreme compartment 18 through slain at 22 additional gas flow, l-.ro value is controlled

according to the abo.note, and the integrated 1 n (and the differential. to the signal of inconsistency, and the accessibility of the sensors from 27. 1-1s1K) .1sign and new elements to (; nstruktsii i path supply d), | iositelnogo with zasloikoy, iravlev e .Orm regulator from the current sensor, which is installed in neiHi excitation of the rotor and 10I1, and its iodine donor gas in a reversible ionization on the rotor excitation current favorably distinguishes the proposed electrical machine from lipoTOTiHia. Technological and economic 1c, the properties of the proposed electric manual consist of the following: 1, it: psnspfpkaii about: ;.

11packages (P of the stator core is achieved by redistributing the coolant flow inside the generator without installing additional ventilation elements and actually without additional costs for ventilation;

Claims (2)

Claim 1. An electric machine with gas cooling, for example a turbogenerator containing a hermetic housing, a stator core divided by radial ventilation channels into packages, a gas distribution cylinder with through holes located between the housing and the stator core, a rotor with ventilation channels, a compressor on the rotor shaft, the output of which connected to the specified ventilation channels of the rotor, characterized in that, in order to increase power and its operational reliability, it is equipped with an additional piping the house communicating the compressor through the passage openings of the gas-distributing cylinder with the radial channels of the end packets, and in the pipeline there is a valve installed with the possibility of shutting off the pipeline depending on the rotor heating. 2. Machine under item 1, characterized in that the additional pipeline is connected directly to the entrance to the ventilation channels of the rotor.