SU425290A1 - MULTI-CHANNEL DEVICE FOR CONTROLLING ELECTROMECHANICAL CONVERTER - Google Patents

Description

I

A device is known for controlling a multiphase electromechanical transducer, each channel of which contains two in series and according to connected thyristors interconnected by a winding of a converter, a shunt chain consisting of a series-connected capacitor and a diode.

In the described device for improving speed and efficiency, the capacitor of each channel is connected via an additional switch with the converter winding of the adjacent channel.

FIG. 1 shows a diagram of a device for a two-phase converter; in fig. 2 - timing diagrams, as shown, the work of the scheme.

The windings 1, 2 of the electromechanical converter are connected to the DC power source E via thyristor switches 3, 4, 5 and 6. In parallel to the windings 1, 2, chains of diodes 7, 8 and capacitors 9, 10 are connected. Diodes I, 12 connect the negative one a power supply bus according to a winding clamp 1 connected to a key 3 and a winding clamp 2 connected to a key 5, respectively.

The capacitors 9, 10 are connected to the terminals of the windings 1, 2 thyristors 13, 14. The disconnection of the main thyristors 13, 14 provides 1: auxiliary thyristors 15, 16 and 17, diodes 1b, 19, switching capacitor 20, throttles 21, 22, diode 23.

The keys 3, 4, 5, and 6 are controlled by amplifiers 24, 25, 26, 27, respectively. Delay circuits 28, 29 connect amplifiers 25 and 26 to a master oscillator 30. Auxiliary thyristors 15, 16, 17 are also controlled from a Hepticopa 30 through amplifiers 31, 32 and 33.

The principle of the scheme.

Suppose that the current flows through the winding 1 (/ i in Fig. 2). In this case, the capacitor 9 is discharged and the voltage (/ s,) on it is zero. Thyristors 13, 14, 15, 16 and 17 are closed. At the time U (see Fig. 2), the winding 1 is turned off and the electromagnetic energy stored in it is transferred to the electrical energy stored by the capacitor 9, the voltage (7c, of which at the time tz corresponding to the cessation of current I) becomes equal to L / i max At time 4, keys 5, 6 open, and current / 2 begins to flow on winding 2. Pulse / y, h. arriving at time point / 3 from amplifier 25 to thyristor 13, the semiconductor opens, causing a capacitor to oscillate 9 on the winding 2. The current / 2 at the same time increases with increased capacity (rise of current occurs). When the voltage Uc becomes zero (4 in Fig. 2), the thyristor 13 closes and the current / 2 is determined only by the voltage Ed. When closing the keys 5, 6, winding 2 turns off (4 to Fig. 2), and the processes described are repeated in a different channel.The corresponding timing diagrams of the thyristor control pulses 14 (f / y,) and the voltage on the capacitor 10 (Uc,) are also shown in Figs. 2

Subject invention

A multichannel device for controlling an electromechanical transducer, each

Each channel contains two series and according to connected keys connected to each other by a converter winding, a shunt chain, consisting of a series-connected capacitor and a diode, characterized in that, in order to increase speed and efficiency, the capacitor of each channel connected via an additional key with the winding of the transducer of the adjacent channel.