SU1244750A1 - A.c.electric machine with liquid cooling - Google Patents

Abstract

This invention relates to the cooling of alternating current electric machines with liquid. The purpose of the invention is to improve the cooling of the machine. The machine contains a sealed, fluid-filled housing, in which the stator with the winding 16 and the discharge unit are located. The machine is equipped with a two-half-period rectifier 21 and a saturation throttle 19, and the delivery unit is made in the form of a built-in electric pumping unit. . Due to the connection of the injection unit with the stator winding, the following mode of operation of the cooling system is ensured depending on the load of the electric machine, which leads to an increase in the economy and reliability of the machine. 2 Il. O) to 1 U cl 1 J

Description

The invention relates to electrical engineering and relates to the cooling of AC electrical machines.

The aim of the invention is to improve cooling, increase efficiency, reliability and durability.

FIG. 1 shows the layout of the electric machine; in fig. 2 is an electrical circuit connecting the drive of an electric pump unit to an electric machine circuit,

The liquid cooled electric machine (FIG. 1) comprises a shaft 1, a rotor 2 and a stator 3 mounted in an airtight housing 4 filled with a liquid refrigerant. Closed refrigerant circulation takes place from cavity 5 on one side of rotor 2 to cavity 6, along the other side of the rotor 2 through the channels 7 in the rotor 2, the channels 8 in the stator 3 and through the gap

9 between the rotor 2 and the stator 3. Cooling of the coolant heated in these channels occurs in the annular channel 10 between the housing 4 and the stator 3 Forced circulation of the refrigerant is provided by an electropump unit 11S installed inside the housing 4. There are several such units, three to four. In the cavity 5 between the exit of the electropump. Of the aggregate 11 and the exit into the channel

10 an annular chamber 12 is installed, the inlet holes 13 on the side of channel 10,

Asynchronous motors 14 (Fig. 2) of the drive of pumping units 15 are included in one of the phases of the winding 16 of the cooled electric machine. Winding

17 engine control 14 is connected in series with the working winding

18drossel saturation 19 „magnetizing of which 20 is connected: to the outputs of the constant gok of the two semi-linear rectifier 21, included in the phase winding of the winding 16 of the machine.

The cooling of the electric machine is as follows (in Fig. 1, the circulation of the refrigerant is shown by the arrow -sh).

Pump of the electric pump unit

11 picks up the heated refrigerant from cavity 5 and pumps it into the cutter 12. From chamber 12 through hole 13, the heated refrigerant enters the annular channel 10 5, where as a result of contact with a cold case 4, it is cooled;

five

ten

20

25

447502

the coolant enters cavity 6, from where it passes the channels 7.8 and 9 and the cooling of rotor 2 and stator 3 again enters cavity 5. The intensity of cooling 1; is determined by the speed of rotation of the motor of the electric pump unit, which depends on load- Kii cooled electric machine. When the electric machine (Fig 2) works, the alternating current of one of its phases of the winding 16 (or lines) is fed to the input of a full-wave rectifier 21 "From the output of this rectifier, direct current is supplied to the magnetizing winding of 20 droplets 19 sat- ffi.eHHiia The inductance of throttle saturation, depends on the magnitude of the magnetizing current, the average value of which is | equivalent to the phase (or linear) current of the electric machine being cooled. With increasing machine load increases and the magnitude of the current. In this case, the inductance of saturation droplets 19 is reduced due to the nonlinearity of the magnetization characteristic of the material of its core. This causes a decrease in the voltage drop across its working winding 1b, and therefore, an increase in the voltage on the engine control winding 17 leads to an increase in its speed, and performance of the pump unit 15, and therefore, to increase the intensity of cooling of the electric machine.

The control circuits of electric pumping units can be calculated and. They are selected in such a way that they can ensure the alternate switching on of electric pump units, which in turn can significantly extend their service life. The system also increases the reliability of the system: booster motor, because the short circuit of a single electric pump unit does not interrupt the supply of liquid dielectric ™ I: cooling systems j, whereas with one injection device or pump unit with jriHHM electro-;:;, and bodies T31; oh no guarantee.

thirty

40

50

Thus, the use of the invention in- cures thetekil to ensure the following operating mode of the cooling system / .an, depending on the load of the electrical ii-Ti-iKu, the actual data will improve the process.

cooling, increases efficiency

and the reliability of the machine as a whole.

I.

The invention can be used in any electrical engineering plant where it is necessary to cool liquid-filled AC electric machines.

invention formula

An electric machine of alternating current with liquid cooling, and a sealed housing filled with a liquid refrigerant in which a shaft, a rotor, a stator with a winding are located

- / 7, d 73. / S / 8/3 .6

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the cooling channel and the injection unit, which is different from the fact that, for the purpose of cooling cooling, increasing efficiency, reliability and durability, it is equipped with a two-wavelength rectifier and saturation throttle, the delivery unit is made in the form of an integrated unit of electric pump units, winding the control of each of which is connected in series to the working winding of all-in-one throttles, its magnetizing winding is connected to the DC outputs of a two-half-period rectifier, and its AC inputs are turned on enes sequentially in phase stator winding.

. / S / 8/3.

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Editor N.Shvyschka Order 3925/56

Compiled by L.Kartseva

Tehred O.Gortvay Proofreader S.Shekmar

Circulation 631 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d. A / 5

Production and printing company, v, Uzhgorod, st. Project, 4

Claims (1)

Claim Liquid-cooled electric alternating current machine Kitsa is a sealed housing filled with liquid refrigerant in which a shaft, a rotor, a stator with a winding are located, 1244750 4 cooling channel and a discharge unit, which is distinguished by the fact that, in order to improve cooling, increase economy, reliability and 5 'longevity, it is equipped with a half-wave rectifier and a saturation choke, the discharge unit is designed as a built-in. of a block of electric pump units, the control winding ¹ 0 of each of which is connected in series to the working winding of the saturation inductor, its magnetizing winding is connected to the DC outputs of a half-wave rectifier, and its AC inputs are connected in series to the stator winding phase. Figure 1