SU839681A1 - Apparatus for producing annular magnet castings by directional crystallisation - Google Patents

Description

(54) DEVICE FOR PRODUCING CASTING OF RING MAGNETS DIRECTED BY CRYSTALIZATION

The invention relates to the production of ¹ permanent magnet with high magnetic energy for electric machines.

Known devices for producing castings of annular permanent magnets with radial directional crystallization, ⁵ containing an annular refractory shape with an internal cavity for forming a magnet casting, an annular heater and a refrigerator [V].

A disadvantage of the known devices yavlya- ¹⁰ etsya that of castings produced using ethics devices can be manufactured annular permanent magnets with high magnetic energy density with only the radial magnetic teksturovkoy one polarity for forming an internal bore and with reverse polarity on the outer surface koltserogo magnet.

Due to a slight increase in the specific magnetic energy on these castings during the manufacture of many pole annular permanent magnets with alternating polarity of poles along the generatrix of the ring magnet, these devices did not find industrial application for producing castings of multipolar annular permanent magnets. The specific magnetic energy of multipolar ring permanent magnets, in particular. of alloy UNDK35T5, when using these devices increases only 15% in relation to alloys with equiaxial structure.

The purpose of the invention is the creation of a device for producing castings of multipolar ring permanent magnets with high energy and with alternating polarity along the generatrix of the ring magnet.

This goal is achieved by the fact that on the inner cylindrical surface of the refrigerator, at intervals equal to the size of the magnet casting pole, heat-insulating gaskets are placed with a circumference equal to the distance between two adjacent magnet casting poles.

In FIG. 1 shows the proposed device; in FIG. 2 - section A - A in FIG. one.

The device contains an annular refractory form 1 with a cavity for forming a magnet casting - an annular heater 2, a water-cooled refrigerator 3 with an inner surface in the form of cylinder parts 4 and heat-insulating gaskets 5, heat-insulating) stand 6.

To obtain castings of multipolar annular permanent magnets, the molten alloy is poured into the refractory form and, using an adjustable heater and an adjustable refrigerator, provide conditions under which the melt crystallizes in the direction from the parts of the refrigerator cylinder to the heater. In the ebb of a ring magnet, radially directed columnar crises are obtained; galls 7 over the entire volume of poles in the casting sections enclosed between the radii drawn from the center of the heater to the edges of the refrigerator, and the equiaxial structure 8 between the poles, which I provides a pronounced magnetic anisotropy in the direction of the poles with respect to the inter-pole * zones, reduces inter-pole scattering magnetic flux and allows castings of multiply .30 pole polar permanent magnets with high specific magnetic energy and alternating poles to

839681 4 inner and outer generatrix of a ring magnet. The magnetic characteristics of multipolar ring magnets, castings of which were obtained using the proposed device ^ pole filling are increased in relation to ring multipolar magnets, castings of which are obtained using known devices, with a specific magdo of 10 million G. E.

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Claims (1)

FIG. 1 shows the proposed device; FIG. 2 is a section A — A of FIG. 1. The device contains an annular refractory mold 1 with a cavity for forming a magnet casting — an annular heater 2, a cooled cooling box 3 with an inner surface in the form of parts of a cylinder 4 and heat-insulating gaskets 5, an insulating stand 6. To obtain multi-core ring magnets. molten alloy is poured in and, with the help of controlled heating of the bodies and an adjustable cooler, they ensure the conditions under which the melt crystallizes away from the parts of the cylinder Indra holodolnik to the heater. In the casting of the ring magnet, radially directed columnar crystals 7 are produced along the entire volume of the poles in the casting areas between radii drawn from the heater center to the edges of the cooler and equal to the structure 8 between the poles, which provides a pronounced magnetic anisotropy in the direction of the poles relation to the interpolar zones, decreases the interpolar magnetic flux dispersion and allows to obtain castings of many-poleal circular permanent magnet with high specific magnetic energy and black polar poles along the inside and outside of the forming magnet ring. The magnetic characteristics of multi-pole ring magnets, castings of which are obtained using the proposed arrangement, are increased in pole poles with respect to ring multi-pole magnets, castings of which are obtained with the help of known devices, by circular magnetic energy from 5 to 10.9 million Gs. E. Claims of the invention A device for producing castings of ring magnets by directional crystallisation, comprising an annular refractory mold, a heater and a ring-shaped cooler, placed inside and outside the form, characterized in that, in order to obtain multipole ring magnets with enhanced magnetic characteristics, on the inner cylindrical surface of the refrigerator, at intervals equal to the size of the pole of the magnet, there are placed heat-insulating spacers with a circumference of equal length ezhdu two adjacent poles of a magnet. Sources of information taken into account in the examination 1. USSR Author's Certificate No. 1985666, cl. In 22D 27 / O4, 1965. FIG. 2