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Magnetic annealing of amorphous alloy for motor stators
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MessaggioOggetto: Magnetic annealing of amorphous alloy for motor stators
Inviato: 23-05-2022 3:20:02
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Magnetic annealing of amorphous alloy for motor stators



A magnetically annealed amorphous metal motor stator is manufactured by magnetically annealing individually the stator yoke and stator teeth and then assembling the components to form a stator so that the field is radial in the teeth and varies or is circumferential in the yoke.Get more news about Amorphous Stators,you can vist our website!
Amorphous magnetic metal alloys are well known in the art. These metal alloys can be produced by rapidly heat quenching liquid metal compositions, for example, of iron and cobalt along with auxiliary chemicals to produce thin ribbons or wires. The alloy produced by this process is a glassy alloy (one in which the atoms are in a state of disarray).
The heating conditions under which the alloy is produced should be of such a time and temperature sufficient to relieve the alloy of all stresses. However, the temperature should not be less than would be required to initiate crystallization. Once the initial high temperature heating step is completed, the alloy is cooled to a lower temperature and held in a magnetic field to produce a magnetic amorphous metal alloy. This latter step is known in the art as magnetic annealing.
During the annealing step, the ribbon produced during the initial heating process is brought to a lower temperature for purposes of magnetic annealing. The direction of the field during the magnetic anneal may lie in the plane of the ribbon and be either parallel or transverse to its length. By controlling the direction of the field, the strength of the field, as well as the temperature-time cycle of the anneal, the magnetic properties of the resultant material may be varied to produce a wide range of different and useful characteristics for magnetic circuit elements.
A group of magnetic, amorphous metal alloys are commercially available and marketed under the trademark "Metglas". Further, methods for producing these alloys are described in U.S. Pat. Nos. 3,856,513 to Chen et al, 3,871,836 to Polk et al and 3,862,658 to Bedell.
The advantages of amorphous metal alloys in reducing magnetic losses in transformer cores is well established. Amorphous alloys require lower magnetization to produce a given field and thus when used in transformers involve lower power losses. In the manufacture of transformers, it is established practice to anneal the transformer core before final assembly. This annealing process involves raising the temperature of the transformer core to a temperature of about 300° C. while at the same time applying a magnetic field in the preferential direction over a period of several hours.
In a specific application of magnetic annealing Sakakima et al in U.S. Pat. No. 4,312,683 disclose amorphous alloy films which are heat-treated in the presence of magnetic fields directed in a different orientations.
Another U.S. patent of interest is U.S. Pat. No. 4,312,683 to Sakakima et al which discloses amorphous alloy films which are heat-treated in the presence of magnetic fields directed in two directions. One field is applied vertically in a direction perpendicular to the plane of the film and a second field is applied in a rotating direction. This is done to suppress induced magnetic anisotrophy (opposed to isotrophy: anisotrophy refers to different values along the axis).
U.S. Pat. No. 4,268,325 to Handley et al offers a rather comprehensive disclosure involving electro-magnetic annealing of metal alloys. In that patent O'Handley et al state that glassy (atoms arranged in a disorderly array) metal alloys have demonstrated attractive soft ferromagnetic properties for relays, AC generators, transformers, motors and magnetic amplifiers. In a specific application Handley et al anneal a magnetic glassy alloy sheet by a process involving a magnetic anneal to induce magnetization inside the sheet with the field being applied in an essentially normal direction. While this first field is being applied a second weaker magnetic field is applied simultaneously with the first field. Or alternatively, the second weaker field can be applied at a lower temperature after the first field application. The sheets so produced have low hysteresis losses. Further, the sheets produced are about 0.02 mm and 0.1 mm thick and can be laminated and stacked for use in the manufacture of transformer cores. Besides being used to form transformer cores, the sheets can be laminated together to form bars and rods for other electronic applications. The magnetic properties of the amorphous alloy ribbon are extremely stress-sensitive and suffer degradation when wound into toroidal form. To avoid this problem shaped, toroidal forms of amorphous alloy are magnetically annealed.
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