Asea Brown Boveri Ab

Gunnar Zinders

Stefan Valdemarsson

Tommy Holmgren

Dan Elofsson

Olle Ekwall

Bjorn Sandin

Bj&ouml;rn Sandin

A tubular core (,) for a controllable inductor with a main winding (,) surrounding the core and a control winding (,) passing substantially axially through the core. The core (,) is capable of receiving a magnetic flux from the main winding (,) running substantially axially therethrough and having a plurality of core rings (,) stacked co-axially on top of each other and connected to a rigid unit. The core rings (,) are connected to each other forming a walled construction. The core (,) also has an inner envelope (,) with an outer cross-section that is substantially equal to the inner cross-section of the core ring walled construction. The walled construction has joints (,) between the core rings (,) in an axial direction which are overlapped by a part of the envelope (,).

Core for a controllable inductor and a method for producing therof

A controllable inductor including at least one tubular core (10), a main winding (5) surrounding the core and a control winding (11) running substantially axially through said core and returning substantially axially outside thereof between said core and said main winding. The control winding is divided into a plurality of separate part control windings (12). The cross section of the part control windings is formed in a way that at least some adjacent part control windings inside the core are separated by means of a spacing (20, 26), which is at least partly defined by substantially parallel surfaces (16, 17) of these part control windings.

Controllable inductor

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Smedjebacken, Sweden

Gunnar Zinders