SU51724A1 - Magnetizer - Google Patents

Description

In connection with the widespread use in electrical engineering of ring and star-shaped magnets of high-coercive alloys with H, -500 and higher, and their number of poles is equal, etc., the need for magnetizing devices appeared.

These magnetizable devices are calculated for a magnetizing force of up to 10,000-12,000 oersted, since only with such fields the above mentioned steel is brought to a state of complete magnetization. Therefore, coils of conventional magnetizing devices are calculated for 50,000-60000 ampeaters and receive huge sizes.

In addition, these magnetizers must have as many magnetizing coils as there are poles in a magnetisable permanent ring magnet. In practice, these devices have eight magnetizing coils, which allows the device to be used as an eight-pole device.

If it is necessary to magnetize a six-pole magnet, then it is necessary to disassemble the apparatus, remove the two coils and

two shoes and reconnect the coil switching circuit.

If it is necessary to magnetize a four-pole magnet, it is necessary to remove the four shoes and reconnect the coil switching circuit.

The coils and magnet shoes are very heavy (the coil is 30 kg; the shoe is 10 kg), as a result of which the bulkhead layout, as well as the magnetization itself, takes a lot of time and is very difficult.

Unlike the above-mentioned known magnetizers, in which each elementary permanent magnet required for magnetization requires its own magnetomotive force, in the apparatus proposed there is only one magnetizing coil that creates a bipolar magnetic field, and the coil core is always a pole one (either of the two) polarities, and the outer (relative to the coil) cylinder is the pole of the other polarity.

In FIG. 1 shows the magnetization of a four-pole ring; FIG. 2 magnetization asterisks; it requires two outdoor

Shoe B, through which the flow passes from the core through Shoe A and a magnetized ring into the body of the apparatus; FIG. 3 shows magnetization of a six-pole ring; FIG. 4 magnetization of an eight-pole ring. FIG. 5 shows a section of the shoe A of the central core and the magnetizable sprocket (along the line CD in FIG. 2); in fig. 6- shoe A, top view; in fig. 7-section of the apparatus along the line CD (Fig. 1)

The magnetic circuit of the electromagnet is made in the form of a cup with a central core (Fig. 1). The cup holds the coil worn on the specified core. An adjustable pole shoe A is installed on the same core, having a number of poles, half the number of poles of a magnetized ring or star-shaped magnet, and used to set up a magnetized object and to form poles of one polarity in it. Other adjustable pole shoes B, made in the form of plates narrowed towards the core, are fixed to the wall of the cup and used to form poles of a different polarity on the ring.

By distributing the flux coming out of the core through the shoe L along the branches of the magnetizing ring, one can achieve magnetization of the ring or asterisk by any practically necessary number of poles.

The made sample of the proposed magnetizing device has almost eight times less weight than the commonly used devices, saves over 200 kg of electrolytic copper, is eight to ten times cheaper and faster to perform, does not require circuit assembly during magnetization, as well as fixing and installation magnetisable magnet, which greatly reduces the time required for magnetization.

In addition to this, the proposed apparatus fits freely on a stool and can be lifted and rearranged by one person, while a conventional apparatus occupies an area of about 4 -. The energy required for magnetization is halved with a magnetizing force equal to 100,000 ampere-turns.

These results are achieved due to the fact that in the proposed apparatus the cross-section of the flow path is extremely long, and the length of the flow path is very small, due to which the fall of the magnetomotive force along the flow path is small and the main part of the magnetizing force falls on the magnetized magnet. In ordinary machines, however, the length of the flow path is very long (otherwise it is not possible to obtain a large cross section of the shoes of the apparatus), as a result of which a large part of the magnetomotive force falls on conducting the flow through the long path of the magnetic core and only a small part falls on the magnetized permanent magnet.

The subject matter of the invention.

Magnetizing apparatus for magnetizing ring and star-shaped magnets, characterized in that the electromagnet, the magnetic circuit of which is made in a viht, e cup with a central core accommodating a coil worn on this core, is equipped with adjustable pole shoes, one of which has a half number less than poles of a magnetizable ring or star magnet, mounted on a central core and used to set up a magnetizable object and to form one pole on it polarity, and the other is secured to the wall emye cup are in the form of narrowed toward the core plate and are used to form on the ring or the sprocket poles other polarity in order magnetization ring and star-shaped magnets on the pole by any number of permutations of shoes. to the author's certificate of N. A. No. 51724 Komissarchik

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