DE241705C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

CLASS 2 \ g. GROUP

ERICH BECKMANN in

Method of magnetizing permanent magnets.

yes ^ - ^x Patented in the German Empire from March 14, 1911 al)

The magnetization of steel magnets is mostly carried out according to the method that has been customary up to now by placing it on a powerful electromagnet. The process is good for magnets with widely spaced apart magnets Poland. If, however, it is a question of magnets with an almost closed iron or steel circle, which only have a narrow air gap, you can do this with the poles of the electromagnet cannot reach the actual pole faces of the steel to be magnetized. When using the method outlined above, it is then necessary to place the electromagnetic poles in the vicinity of the poles of the Put on steel magnet, with the flow of force emanating from the electromagnet in the steel magnet Takes two paths: one that covers the essential part of the thigh and the yoke interspersed, and one that goes through the leg ends and the air gap.

The directions of magnetization on these two paths are relative to the normal one magnetic circuit of steel magnet, opposite to each other. Hence, the gap becomes saturated turn out to be smaller than the magnetic properties of the steel grade correspond to would.

Correct magnetization and a far better result are obtained if the steel is temporarily provided with a winding and a strong current flows through the latter for a short time. However, this method can only be used in practice if one has such large currents, 40

that a single turn Ww. a single conductor introduced into the interior of the magnet produces the sufficient number of ampere-turns. Frequent switching on and off such large currents as would be required in manufacture are meanwhile also very uncomfortable, not to mention the energy consumption.

The present invention achieves proper magnetization in the following ways:

The steel magnet to be magnetized or a larger number of the same is via a strong rod-shaped conductor striped and the latter with its ends to the secondary side connected to a transformer for large current and relatively small voltage.

Then the primary winding of the transformer is connected to a source of direct current and immediately afterwards disconnected again by a switch placed in the supply line is closed and opened again immediately.

The force line field of the transformer, which disappears when it is switched off, is generated in the secondary circuit a steep current impulse of high peak value, which leads to the Magnetization is completely sufficient. The energy requirement is very low.

The same purpose can be achieved by introducing alternating current into the primary winding of the Transformer can be achieved if it is ensured that the shutdown in the The moment occurs in which the current goes through zero.

It is useful for magnetization

the magnetic circuit of the steel magnets through an iron inserted into the air gap closed.

Claims (2)

Patent-to sayings: i. Method of magnetizing permanent magnets using one best consisting of a few turns or a single conductor winding, characterized in that the magnetizing Current is drawn from the secondary winding of a transformer in the form of a current surge that occurs during Switching off or when switching on the primary winding excited with direct current occurs. . ■ ■ 2. The method according to claim 1, characterized in that the transformer excited with alternating current and its primary winding is switched off at the moment in which the current passes through zero goes, so that the magnetization remains, the one preceding the shutdown ' Corresponds to the peak value of the current.