| 摘要 |
<p>The invention relates to an inductor with variable inductance based on the principle of orthogonal magnetization, that is, control of the permeability of the magnetic material with the aid of a cross-directional control field. The inductor has a main winding (2) which is intended for alternating current and which surrounds a tubular core (3) wound from tape-formed magnetic material. The core is composed of a plurality of ring cores (31) which are stacked coaxially one above the other and which are axially divided and angularly displaced relative to each other. Axially through the core extends a control winding (4) intended for direct current. By changing the current in the control winding, the permeability of the core is changed in its axial direction and hence also the inductance of the inductor. The eddy-current losses in the core can be considerably reduced by making the core conically tapering towards its ends or by arranging so-called flux funnels (8) with radially bladed laminations near the ends of the core. The inductor is especially suitable for use in power plants, for example in tunable harmonic filters for high-voltage direct current.</p> |
