SU782694A1 - Self-sustaining mhd-generator - Google Patents

Description

The invention relates to the field of direct conversion of thermal energy into electrical energy, namely, autonomous magnetohydrodynamic (MHD) generators and can be used, for example, in installations for geophysical studies during electrical sounding of the earth's crust.

MHD alternating current generators are known, comprising a channel, means for supplying the working fluid, and an electromagnet that is connected to an alternating current network. The disadvantage of this MHD generator is the impossibility of its operation in the autonomous mode.

The most / closest technical solution is an autonomous MHD generator containing a channel, an electromagnet, sources

nickname of initial excitation energy and load.

The disadvantage of such an autonomous MGDyu. The generator is that in order to obtain a voltage at the output, it is necessary to connect an independent inverter between the channel and the load, and this complicates and increases the cost of the design of the MHD generator.

The purpose of the present invention is to simplify the generator and to obtain at its output a variable voltage. This goal is achieved by the fact that in a known autonomous magnetohydrodynamic generator containing a channel, an electromagnet, a source of initial excitation energy and a load, with an electromagnet winding, an additional capacitance of a series oscillating circuit, including an electromagnet winding, is included, and an adjustable variable resistance is included in the channel circuit. In addition, the initial excitation source contains a capacitor bank, the included is the composition of the additional capacitor of the oscillatory circuit.

The drawing shows an electrical Ck ema a va n o m M DG gene generator.

The 1MGD generator has a channel 1, a winding of a magnet 2, an additional capacitance 3, an adjusting variable resistance 4, a source of initial excitation energy 5, a key for connecting and disconnecting it

6 and load 7.

The coil of the electromagnet 2 is connected in series with channel 1, (1dlg1 | zhitmzhA capacitance of the oscillating circuit 3 and adjusting variable resistivity 4. The source of initial excitation energy 5 is switched on along with the key b of the electromagnet 2, Load

7 connected to the terminals MHD -g% not | mash.

In other embodiments, the initial excitation energy source 5 may be connected in series with the magnet winding, and the variable control resistance 4 may be connected parallel to the winding of the electromagnet 2 or parallel to the Additional capacitance 3, as well as parallel to both of them. The load 7 can also be included in series with the winding of the electromagnet 2.

The device works as follows COMV, -. . - -. A sequential oscillating circuit is formed in the excitation circuit of the MHD generator. As a result of the oscillating energy exchange between the additional capacity 3 (the value of the additional capacity must be such that it can

receive all the energy stored in the magite) and the winding of the electromagnet 2, the current in the next, and next 6; 6 steps, and 1 induction in channel 1 and the voltage at the output of the MG (-generator becomes a key.;

In order to obtain the required parameters of the oscillatory wave, as well as for adjusting the aaHMii, the frequency of the first and foremost voltage includes an adjusting variable resistance 4, which changes

oscillation frequency in the circuit. In that case, if there is no need for frequency control and the parameters of the circuit are sufficient for the required operating mode, a circuit is possible without an adjusting alternating resistance 4.

AC voltage gains from

autonomous MHD generator described in

As a prototype, in principle, it is possible

by setting the output of the MHD generator

inverter. ,

The proposed device makes it possible to exclude frequency controlled inverter switches that commute large powers on up from the MHD generator.

This leads to a simplified device and, consequently, to an increase in the reliability of its operation, as well as to a reduction in the weight and size characteristics. In addition, the proposed device has the advantage

that it greatly simplifies the conversion of the output voltage, since the AC voltage converter is much simpler than the constant voltage.

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Claims (2)

(54X57) 1. A stand-alone magnetohydrodynamic generator containing a channel, an electromagnet, an initial excitation energy source and a load, characterized in that, in order to simplify the generator and obtain an alternating voltage at its output, an additional capacitance of a series oscillatory circuit is included in series with the electromagnet winding, including an electromagnet winding, and an adjustable variable resistance is included in the channel circuit. 2. The self-contained magnetohydrodynamic generator according to claim 1, characterized in that, in order to improve weight and size indicators, the initial excitation energy source contains a capacitor bank included in the additional capacitance of the oscillatory circuit.