Asea Brown Boveri Ab

Dan Elofsson

Stefan Valdemarsson

Tommy Holmgren

Bjorn Sandin

Gunnar Zinders

Olle Ekwall

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 a tubular core, a main winding (1) surrounding the core, a control winding running substantially axially to the core and an element (3) surrounding the core and arranged to support the main winding wound outside thereof in radial layers. The element includes means arranged to provide channels (19) partly defined by the radially inner turn of the main winding. Said channels are communicating with spacings between said layers (2). A member is arranged to generate a flow of air in the channels and through the spacings of the layers for cooling the main winding.

Controllable inductor

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.

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Ludvika, Sweden

Dan Elofsson