Iron core structure with permanent magnet materials for auxiliary excitation

Abstract

The invention provides an iron core structure with permanent magnet materials for auxiliary excitation. The iron core structure is formed by a single square iron core or splicing of a plurality of square iron cores and adopts the structure form of AC / DC winding loose coupling. The iron core structure is characterized in that permanent magnet material bodies are installed outside or inside the iron core; the directions of the magnetic fields generated by the permanent magnet material bodies are identical to the directions of the magnetic fields generated by DC excitation; the permanent magnet material bodies can be wholly or partially embedded into one or a plurality of sections of the iron core; or a group of strip-type, plate-type or barrel-type permanent magnet material bodies are assembled outside or inside the iron core along axial directions of iron core columns; and the permanent magnet material bodies can be installed on the iron core column at the AC side, on a yoke outside the iron core or at the corners of the iron core. The iron core structure adopts the permanent magnet materials to provide constant bias, is suitable for the electrical equipment with iron cores needingto work under the condition of saturated bias, such as saturated iron core reactors, saturated iron core superconducting current limiters, motor soft starters and the like, and can effectively reducethe volume and weight of the equipment and lower the manufacturing cost.

Description

technical field [0001] The invention relates to a special iron core structure, in particular to an iron core structure with permanent magnetic material auxiliary excitation. Background technique [0002] The electrical equipment whose iron core needs to work under the condition of saturated magnetic bias, such as saturated iron core reactor, saturated iron core type superconducting current limiter, motor soft start equipment, etc., its common working principle is to adjust the magnetic saturation degree of the iron core through the magnetic bias , and then adjust the inductance value of the AC winding on the core to realize its function of regulating current. Generally, when the bias is large, the magnetic saturation in the core is deep, and the device is in a flow-through state with low impedance; when the bias is small or zero, the core is in an unsaturated state, and the device is in a current-limiting state with a large impedance. The biasing of the core is usually achi...

AI Technical Summary

Problems solved by technology

The over-excitation method will cause a waste of excitation ampere-turns, and also greatly increase the requirements for the DC winding

The method of increasing the cross-sectional area of ​​the core means increasing the volume, weight and production cost of the equipment

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