SU107430A1 - Reactor - Google Patents

Description

For recieves; 1-1i and iiy.TtiCaniiii rectified current, reactors with and without a steel core are used. Reactors without a steel core to create the necessary inductance require a large consumption of non-ferrous metal, have large dimensions and significant energy loss.

The disadvantage of steel core reactors is the load dependence of their inductance. To reduce it; Depending on the cores of modern reactors are performed with an air gap, which requires an increase in the number of turns of the coil and makes it impractical to use steel core reactors at currents above 1500 amperes.

The design of a steel core reactor allows for the reduction of these drawbacks to a significant degree and for reducing the weight of the active materials and the dimensions of the reactor.

This is achieved by applying in it a demagnetizing winding to ensure constant constant 1, its magnetic flux in the core.

FIG. 1 and 2 depict the scheme of the proposed reactor in two versions.

In the first embodiment (Fig. 1) on the core / reactor, in addition to the main winding W ,. The magnetisation and winding W is located, fed by direct current from rectifier 2 through filter 3. Rectifier 2 is connected to an alternating current source through magnetic amplifier 4, controlled depending on the current flowing through the reactor and configured so that when falling The remote control on the main winding of the reactor through its control winding Wy would run through a non-HOTopi control current. This current ensures that the output of the current amplifier required to create amnerwitches in the additional winding W. of the reactor are equal in magnitude and opposed in direction to the revolutions created by the constant component ui1 of the load current. In this case, the compensation of the constant component of the magnetic flux in the core of the reactor at different loads is provided.

In the second embodiment (Fig. 2), the reactor / has an W-shaped core on which three windings are located: the main winding Wj, the additional winding Wa and the control winding Wo.

The winding Wv is connected in the same way as in the first variant through filJp 5 to the rectifier 6, which receives power from the transformer magnetic device (). The latter has three windings: the primary winding W.i, the secondary winding Wj and the winding level Wo, and connected through a spreader 8, to the secondary winding W, equalizer: a second transformer, 9. Its primary winding consists of two coils Wg and W, j, with the ampere turns of which are directed oppositely. One of these Wg coils is connected to the SOURCE} of the alternating current through the inductor 10 of the constant inductance, and the other W through a winding W of the reactor.

Works reactor as follows.

The windings W, and W2 of the reactor are designed in such a way that when the largest rated load current flows, the primary wiring threads of the primary wiring Vi are equal and opposite to the secondary windings of the additional winding W., So that the magnetic flux does not pass through the core of the reactor. The inductive co-stimulation of the control wrap W., and this is such that the current flowing through the winding Wg and the coil Wg of the balancing transformer creates in the coil Wg ampervitki, equal and iroti of the opposite-wired coil Wg. As a result, an electromotive force does not occur in the secondary winding of the balancing transformer, and the control winding W,., Of the magnetic amplifier is not flowed around the current.

With a decrease in the current flowing through (j6iM (TKy reactor

Wj, the equality of the ampere turns of the windings Wi and Wg is violated and a constant magnetic flux appears in the core of the reactor, decreasing P1, and the inductive resistance of the winding Wo.

At the same time, the current, irotokeyunip through the coil Wg, increases, which leads to the violation of the equality of ampervits in the coils Wg and Wg of the primary winding of the equalization transformer and to the appearance in its secondary winding W, electromotive force. Under the influence of this e. d. in the winding wi; A magnetic amplifier produces a current that reduces the current flowing through the additional winding Wj of the reactor.

The steeper the magnetic amplifier characteristic, the more stable the inductance of the reactor under different loads.

Subject invention

Claims (2)

1. A reactor for compressing ripples of rectified current, equipped with a steel E1 core without an air gap, about the fact that, in order to reduce the number of active materials and dimensions of the reactor, each component is constant and its magnetic flux In other words, demagnetizing about 1 is superimposed on the latter, and the winding is direct current from the terminal connected to the alternating current source through a magnetic amplifier, controlled depending on the current, proceeds 1 c. reactor. 2. In a reactor according to claim 1, use a differential transformer for supplying a magnetic amplifier magnetic field winding with connecting the primary winding of the transformer to an alternating current source through a constant inductor, and another primary winding through auxiliary winding 1) () to the heart - ir reactor.