Iron core structure with permanent magnet materials for auxiliary excitation

A technology of permanent magnet material and auxiliary excitation, applied in the field of iron core structure, can solve the problems of waste of excitation ampere-turn, increase of DC winding requirements, increase of equipment volume, weight and production cost, and achieve the effect of reducing production cost and volume.

Active Publication Date: 2011-06-15
云南电力试验研究院(集团)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Iron core structure with permanent magnet materials for auxiliary excitation
  • Iron core structure with permanent magnet materials for auxiliary excitation
  • Iron core structure with permanent magnet materials for auxiliary excitation

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Embodiment Construction

[0027] In the present invention, the iron core with permanent magnet material auxiliary excitation is a square iron core or other similar shape iron core, which can be a single iron core (see figure 1 ) or a combination of several iron cores (see figure 2 , each core has a central core column 21 and a side column 22) structure. The DC winding 1 and the AC winding 3 are respectively located on the pillars of different iron cores of the same iron core window 2, which is a loosely coupled structure.

[0028] For this type of loosely coupled structure, the excitation magnetic potential generated by the DC winding should be effectively transferred to the AC side core column, and make it reach the required saturation level. The structural characteristics of loose coupling and the magnetic flux leakage will increase greatly when the core is saturated, so that without other auxiliary excitation means, it is necessary to increase the DC excitation ampere-turn and / or increase the cros...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F3/00H01F41/02
Inventor 信赢龚伟志张敬因陈志莉
Owner 云南电力试验研究院(集团)有限公司
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