SU819829A1 - Device for thermal magnetic treatment of electric machine multi-pole ring permanent magnets - Google Patents

Description

(54) DEVICE FOR HEAT-TREATMENT

MULTIPOLUS RING PERMANENT MAGNETS

ELECTRICAL MACHINES

one

The invention relates to the production of multi-pole permanent ring magnets for electrical machines.

A device for thermomagnetic processing of multipole annular permanent magnets of electrical machines is known, which contains a heater and a multipolar source of magnetic field made in the form of an electromagnet, the magnetic circuit of which is made from the central pole of one polarity and separate polar poles of reverse polarity, located around the central pole with a gap to accommodate machined magnet and connected by magnetic cores with the central pole 1.

When using this device for thermomagnetic processing of multi-pole circular permanent magnets with radially directed crystallization along the poles, the directions of the magnetic fields do not coincide with the direction of the columnar crystals along the poles and the magnetic properties of the alloy are not sufficiently high.

The aim of the invention is to increase the magnetic properties of the treated magnet.

This goal is achieved by the fact that in the device for thermomagnetic processing of multipole annular magnets of electric machines the central pole is cylindrical, and the separate poles have a cylindrical outer surface.

FIG. 1 shows the proposed device; in fig. 2 is a section. A-A of FIG. one.

The device contains a central cylinder {cic pole 1, separate poles 2 with a cylindrical outer surface, magnetic cores 3, connecting separate poles with a central cylindrical pole, magnetizing coils 4, detachable heaters 5. In the gap between the separate poles 2 and the central pole 1, the processed magnet is placed , having a pole 6 with radial directional solidification and interpolar zones 7 with equiaxial structure.

Claims (1)

To conduct isothermal thermomagnetic treatment of a ring multi-pole magnet with radially directed crystallization across the poles, in particular from UNDK35T5, it is heated to a temperature of 1250 ° C and kept at this temperature for 20 minutes to obtain a single-phase state, then the magnet is placed between the poles of an electromagnet so that 6 magnets with radial column crystallization coincided with separate poles 2 of the source of the magnetic field. With such a position of the magnet, the directions of the magnetic fields coincide with the directions of the crystals along the entire height of the pole. The detachable heaters are in this position (Fig. 2, dotted line). After the magnet is cooled in a magnetic field to an isothermal holding temperature (for UNDK35T5 on the order of 795 ° C), the split heaters, preheated to isothermal holding temperature, are transferred to the position shown in FIG. 1, and an isothermal magnet is processed, after which the magnet is transferred to a tempering furnace. Apparatus for thermomagnetic processing of multi-pole annular permanent magnets of electric machines, comprising a heater and a multi-pole magnetic field source, made in the form of an electromagnet, the magnetic circuit of which is made of the central pole of one polarity and separate reverse polarity poles located around the central pole with a clearance of accommodating the magnet being machined and connected by magnetic cores to the central pole, characterized in that, in order to increase the magnet properties of the machined magnet, the central pole is cylindrical, and the separate poles have a cylindrical outer surface. Sources of information taken into account in the examination 1. Copyright USSR № 557874, cl. H 01 F 13/00, 1975. R FIG. 2