SU1495945A1 - Thyratron generator - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to DC valve generator circuits operating at a variable frequency of rotation. The aim of the invention is to improve the mass and size parameters of a DC generator at a variable rotor speed. The valve generator contains on the stator a closed 2 M-phase winding with terminals 1-6 connected to a 2M-phase full-wave rectifier assembled on valves 7-18, the winding leads through one connected to the rectifier via controlled keys 19-21, the closure (opening) of which is effected by the signals of the tachometer device 23 with a decrease or increase in the rotation frequency with respect to its average value. 2 Il.

Description

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; The invention relates to electrical engineering, in particular, to schemes of valve direct current generators, and can be used in the development of power supply sources for mobile devices

I The purpose of the invention is to improve the mass- and overall dimensions of a valve DC generator at a variable rotor speed.

Fig. 1 is a schematic diagram of, for example, a six-phase I generator in Fig. 2 — timing diagrams of the generator.

The valve generator contains a six-phase closed stator winding with terminals 1-6 connected to a six-phase full-wave bridge rectifier with valves 7-18, with terminals 2.4 and 6 of the winding connected via switches 19-21 of contactor 22, which is controlled from tachometer speed sensor 23. The excitation winding of the generator 2A is equalized through the voltage regulator 25, which is powered from the rectified voltage. The generator can also be made excited by permanent magnets.

 The generator works as follows.

When the rotor speed exceeds the average value, the keys are 19-21: by. the sensor signal 23 is opened and

the circuit is transformed into a three phase one with a phase connection into a triangle. When the rotation frequency decreases below the average value, the sensor 23 delivers the signal to the closure of the keys 19-21 and the winding circuit is converted to a six-phase closed circuit.

Figure 2 shows the phase and rectified voltage of the generator when the contacts 19-21 (a) are closed, the diagrams of operation of the gate valves (b), the phase and rectified voltage (c) and the diagrams of operation of the valves in the case of open switches 19 -21 (g).

At any time, the rectified voltage is determined by the vector sum of the phase voltages of the parallel branch (Figures 1 and 2). Vectorn. the sum of the voltages A, B, C is greater than the sum of the voltages A and B, which occurs when the keys are open 19-21.

I

With closed keys 19-21 average

the value of the rectified voltage at idle is V - 2.34 U, f. When opening the keys 1} 2.02i. Therefore, opening the keys reduces the rectified voltage by 1.16 times. In this case, the pulsations of the rectified voltage have the same sixfold frequency with respect to the phase voltage, regardless of the state of the keys 19-21 (Fig. 2 a, b).

Thus, switching the winding provides an effect equivalent to a change in the magnetic flux by 1.16 times, which makes it possible to correspondingly reduce the weight and dimensions of the generator, since the range of change in the magnetic flux decreases.

Claims (1)

Invention Formula A valve generator containing a closed 21p-phase winding of the core, each of the 2t terminals of which is connected to the common point of the valves of one of the branches of the 2t-phase full-wave rectifier, characterized in that control keys and a tachometer device, power (the clamps of the keys are connected between one of the core windings located through one terminal and the common point of the gates of one branch, and the control inputs of the keys are connected to the output of the tachometer mouth roystva / / / l /   in with D E  2.85U 2.5 Uf,