SU390586A1 - - Google Patents

Description

THROTTLE WITH ADJUSTABLE INDUCTIVITY

one

The invention is intended to control the speed of a high-frequency electric locomotive.

The speed control of a high-frequency electric locomotive is made by directly or indirectly affecting its receiving power resonant circuit, consisting of power receiver coils and compensating capacitors.

Of the devices indirectly acting on the circuit, chokes are known, which represent two closed O-shaped magnetic cores that enclose the straight-line inputs of the power-receiving coils and are equipped with adjustable-bias windings.

The disadvantages of such chokes are significant residual inductance, to compensate for which an additional large-capacity capacitor must be installed. In addition, a stabilized voltage is required to power the bias windings. The possibility of obtaining such a voltage on a high-frequency electric locomotive is associated with certain difficulties and is practically eliminated with a single-section device, whereby the voltage at the time of passage of the transposition points (crosses of the traction cable) changes from zero to the nominal value.

Installing autonomous power sources (for example, batteries) is not technically feasible.

From devices directly affecting the circuit, devices that detonate the receiving power resonant circuit were introduced by introducing a variable inductance into the circuit — a throttle containing an O-shaped magnetic circuit with a variable air gap, such as a throttle with a moving magnetic shunt. The inductance of such a throttle is adjusted by changing the air gap between the magnetic shunt and the fixed part of the throttle magnetic circuit. The disadvantages of this throttle are significant residual inductance, which requires the installation of an additional high-power compensating capacitor, as well as the presence of significant mechanical forces between the moving and stationary parts of the throttle magnetic circuit from electromagnetic forces.

The proposed choke contains a closed W-shaped magnetic circuit and a winding located on the pull-out middle rod. The active part of the winding is located in a plane parallel to the axis of the extendable rod, and its frontal parts are bent in opposite directions and form a window in which this rod is located.

Such an embodiment of the throttle reduces its residual inductance and the effort to move the retractable rod.

3

FIG. 1 depicts the described choke with an extended middle rod, a general view in axonometry; in fig. 2 - throttle winding, a general view in axonometry.

The choke acts as a closed, spherical magnetic circuit 1, the middle rod 2 of which, by a sliding fit, enters the magnetic core window. The winding 5 throttle laid so that its active part is located in a plane parallel to the axis of the retractable rod. The winding is divided in half and its frontal parts are bent in opposite directions, forming a window for the rod 2.

Drossel work is based on the use of a known relationship between inductance and flux linkage values in magnetic peaks.

When the middle rod is positioned inside the window of the magnetic circuit, its coupling with the flow

four

winding maximum and, therefore, the inductance of droplet maximum. As the rod extends, its adhesion to the winding flow decreases, the inductance of the throttle drops, and when the rod leaves the winding, it reaches a minimum value.

Subject invention

Adjustable inductance choke, containing a closed W-shaped magnetic core and a winding located on a pull-out middle rod, characterized in that, in order to reduce the residual inductance and effort to move the pull rod, the active part of the winding is located in a plane parallel to the axis of the pull rod , and the frontal parts of the winding are bent in opposite directions and form a window in which it is located.