SU1206927A1 - Twelve-phase converter - Google Patents

Abstract

1. A twelve-phase converter containing two three-phase rectifying bridges and the main autotransformer j whose primary windings form input pins, and the secondary windings are connected to the input of the first bridge, characterized in that, in order to expand the functionality, an additional auto transformer was inserted. the windings of which are connected to the input terminals, the primary windings of both autotransformers are connected in a star with a common neutral, the secondary windings of the additional autotra The transformer is connected to the input of the second bridge, and the windings of the main autotransformer are divided into three parts connected in a double zigzag, and the coils of these parts are filled in accordance with W,.-4 W, W, 2К-л | з where Wj is the number of turns primary winding of each autotransformer; W is the number of turns of the second winding part of the main autotransformer; Wj is the number of turns of the third winding part of the main autotransformer; K - the required transformation ratio. 2. A converter according to claim 1, characterized in that, in order to improve technical and economic indicators, autotransformers are made with a common magnetic conductor and with a common primary winding. 3. The converter according to claim 1, in which, in order to improve the quality of the output voltage, one of the bridges is connected to the secondary winding through leveling reactors. 9d UD h

Description

one

The invention relates to a converter technique and may be used in a valve motor when the use of autotransformers is economically justified.

The purpose of the invention is to expand functionality, improve technical and economic indicators, improve the quality of the output voltage.

1 shows a diagram of the device; figure 2 is a variant of the device with a common magnetic core and a common primary winding; FIG. 3 is a voltage chart.

The device (Fig. 1) contains three-phase rectifying bridges 1 and 2, autotransformers 3 and 4, the terminals of the primary windings of which are connected to the input terminals 5-7, the terminals 8-10 of the secondary winding of the autotransformer 3 are connected to the input of bridge 1, and conclusions 11- 13 secondary windings of the autotransformer 4 are connected to the input of bridge 2. The primary windings of autotransformers 3 and 4 are connected to a star with a common neutral 14. The windings of the autotransformer 4 contain parts 15-17, which are connected according to a double zigzag scheme

The device (Fig. 2) differs in that autotransformers are made on a common magnetic core 18.

The operation of the device is as follows.

When the power supply is connected to the input terminals 5-7 of the device, a voltage appears on the windings of the autotransformers 3 and 4 at the same time. In this case, the voltage at the input of the bridge 1 is equal to the voltage at the input of the bridge 2, but shifted in phase by an angle of 30 al. This shift is due to the corresponding amount of 206927.

boron the number of turns of the windings of the autotransformer 4

..4з -к

„----

., 2K-4T

f ---

(ABOUT

(2)

where W is the number of turns of the primary I winding;

W2 is the number of turns of the second winding part;

(t

vv - the number of turns of the third part

winding autotransformator, pa 4;

K - transformation ratio

(figure 2).

The choice of ratios is illustrated by the diagram (Fig. 3). In the voltage diagram, the windings are replaced by proportional values of turns. The numbers of turns W (line AB) and W (line BC) are chosen so that the end of the resulting vector

The OA + AJB + BC OS was always on the OE line, which is an angle of 30 el with the OA vector. hail, which determines relations (1) and (2). With W O, a simple zigzag version (line AC) is obtained, and

K - (W W,), when i it is obtained K / 2 (line OD), with

 (which is equivalent to a change in the polarity of the winding W) K -TGT (line in s).

Thus, at different values of the transformation ratio

angle value 30 el.grad. the desired 12-phase converter is maintained and is not disturbed.

The device (figure 2) has the same ratio of turns and works in a similar way.

n; j

t

l

,

Rig.2

Compiled by G.Maltsev Editor N.Pushnenkova Tehred T.Tulik Proofreader M.Pojo

Order 8731/57 Circulation 632. Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

Claims (3)

1. A twelve-phase converter containing two three-phase rectifier bridges and a main autotransformer whose primary windings form the input terminals, and the secondary windings are connected to the input of the first bridge, characterized in that, in order to expand the functionality, an additional autotransformer, primary winding leads which are connected to the input terminals, the primary windings of both autotransformers are connected to a star with a common neutral, the secondary windings of an additional autotransform the ora are connected to the input of the second bridge, and the windings of the main autotransformer are divided into three parts connected in a double zigzag, and the turns of these parts are made in the ratio where W is the number of turns of the primary winding of each autotransformer; - the number of turns of the second part of the winding of the main autotransformer; W ₃ - the number of turns of the third part of the winding of the main autotransformer; K is the required transformation ratio. 2, The Converter according to claim 1, characterized in that, in order to improve technical and economic indicators, autotransformers are made with a common magnetic circuit and with a common primary winding. 3. The converter according to claim 1, characterized in that, in order to improve the quality of the output voltage, one of the bridges is connected to the secondary winding through equalizing reactors.