A Double Air Gap Closed Ring Permanent Magnet Magnetic Circuit

Abstract

The invention provides a double-air-gap closed type annular permanent magnet magnetic circuit. The permanent magnet magnetic circuit is composed of two work air gaps with the cross section being rectangular, four permanent magnetic poles corresponding to the two work air gaps, four filled blocks with the cross section being rectangular and an octagon yoke iron outer edge frame. The permanent magnet magnetic circuit is vertically symmetrical, horizontally symmetrical and axially symmetrical in structure. The four permanent magnet magnetic poles comprise two N magnetic poles and two S magnetic poles, and are closed in series according to the order from N to S to N and then to S, one N magnetic pole and one S magnetic pole correspond to each other in the vertical direction, a rectangular work air gap is defined by one N magnetic pole, one S magnetic pole and the two horizontal filled blocks, two-pole magnetic fields are generated among the work air gaps, and the directions of the magnetic fields in the two work air gaps are opposite to each other, the N magnetic pole of each work air gap is adjacent to the S magnetic pole of another work air gap, and the N magnetic pole and the corresponding S magnetic pole are located on the same side of an X-axis perpendicular to the magnetic field directions of the work air gaps. The outer circumferential faces of the four permanent magnet magnetic poles and the filled blocks are tightly attached to the inner circumferential face of the outer edge frame of the yoke iron.

Description

technical field [0001] The invention relates to a permanent magnet magnetic circuit, in particular to a double air gap, closed ring permanent magnet magnetic circuit. Background technique [0002] Conventional permanent magnet magnetic circuits are generally divided into two categories: open and closed. Among them, the typical representative of the open magnetic circuit is the C-shaped magnetic circuit structure; the closed magnetic circuit contains many types, such as "mouth" type, column type, "I" type, spherical type, cylindrical type and so on. Compared with open magnetic circuits, closed magnetic circuits have small flux leakage, high field strength, high field uniformity and good field stability, and are widely used in nuclear magnetic resonance systems and magnetic fluid energy conversion and other fields. figure 1 An octagonal two-pole closed permanent magnet magnetic circuit disclosed in Chinese patent 201320070242.9 is used in an electromagnetic fluid ocean oil sp...

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Problems solved by technology

Therefore, the electrode spacing of the magnetic fluid separation channel, that is, the width of the magnet air gap is limited by the safe voltage of the marine ship.

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