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Soft magnetic composites are used in the electrical motors' manufacture and can be considered as magnetic powder particles surrounded by an electrical insulating material. Today there is an interest in bulk soft magnetic composites, because of the high demand for miniaturization of the cores. These materials provide several advantages over classical non-oriented electrical steels. A Somaloy 500 torroidal...
Grain-oriented electrical steels are used in electrical vehicle traction, electric devices such as special motors, transformers and actuators. This type of material presents a strong magnetocrystalline anisotropy that has an important influence on the energy losses and other magnetic properties. It is well known that the classical grain-oriented material has a (110)[001] Goss texture and this structure...
Nowadays electrical machines are the most important electricity consumer, because they are responsible for 70% of industrial demand. The improvement of the electrical machines' energy efficiency can be done among other methods, by using high quality non-oriented electrical steels. High efficiency electrical machines are considered a new trend and are gradually imposing themselves in motor manufacture...
The energy losses depend on the mechanical stresses, induced in the cutting process. It is well known, that the electrical machine manufacturers want to minimize these effects and they choose to use high quality non-oriented electrical steel. The magnetic cores of the electrical machine are made, using mechanical cutting technology, because this method is simple, fast and cheap and the final cost...
In this paper is presented a novel laboratory equipment, which measures the static characteristic B-H of the soft magnetic alloys. The proposed device is very useful, to study the B-H relationship of new magnetic materials, because mechanical machining is not necessary, in order to obtain a special geometrical shape, and the measurement could be done also “in situ” conditions. The magnetic circuit...
In this paper is point out the influence of the classical mechanical cutting on the magnetic properties of three industrial non-oriented electrical steels M400-50A, M400-65A and, M700-50A. The selected materials were magnetically characterized and analyzed at 50 Hz and at a peak magnetic polarization JP ∈ {50, 100, 250, 500, 800, 1000, 1100, 1200, 1300, 1400, 1500} mT. Based on the complex permeability...
Today high efficiency electrical machines are a new and mandatory trend in the motor production in Europe and United States of America. Lately there are developed also higher efficiency classes as IE4 (Super Premium Efficiency) and IE5 (Ultra-Premium Efficiency). It is well known that IE4 electrical motors are available on the market and IE5 machines are taken into account by several big producers...
Measurement performance evaluation is important, because measurement results depend usually on the method used for measurement. The analysis of the repeatability has to be made under some exact conditions: the same measurement procedure, observer, measuring instruments. Also using the same laboratory and conditions, the measurements must be repeated over a short period of time. Usually, repeatability...
Water jet technology that uses abrasive particles is an efficient cutting method, for electrical steels and it has many advantages, by comparison with the classical punching. During the cutting process there are not any heating phenomena and the method has a high versatility with a minimum applied stress on the work piece. There were tested strip samples of M400-50A, M400-65A, M700-50A and M700-65A...
In this paper the hysteresis energy losses in two non-oriented industrial steels (M400-65A and M800-65A) were determined, by means of an efficient classical Preisach model, which is based on the Pescetti–Biorci method for the identification of the Preisach density. The excess and the total energy losses were also determined, using a statistical framework, based on magnetic object theory. The hysteresis...
Mechanical cutting technology is a worldwide method, used to cut the magnetic cores of the electrical machines nowadays. The manufactures of the electrical devices prefer cutting the non oriented steel through this classical method, due to the fact that it is the cheapest of all. Non oriented silicon iron alloys (NO FeSi) are mainly characterized by specific energy losses. The mechanical properties...
Nowadays it is very important to use non-oriented electrical alloys, which must have a very good quality and must be cut through a proper method that leads to a minimum energy loss value. The manufacturers of the electrical machines want to minimize the damage of the magnetic properties during the cutting process, in order to produce high efficiency motors or generators. In this paper are presented...
The standard magnetic measurements, for grain oriented (GO) and non-oriented (NO) electrical steels (FeSi), are made using the Epstein frame or the single strip tester. The magnetic characterization is limited to the rolling direction cut samples for the FeSi GO materials. For the NO ones, the standard measurements give an average of the magnetic behavior in the rolling and the transverse directions...
Punching and laser cutting of non-oriented silicon iron sheets (NO FeSi) determine changes in the material at the cutting edge, which produce an important effect on the magnetic properties. Through punching it results a plastic deformation in the zone near the cutting edge. Laser cutting technology causes thermal stresses, which alter also the magnetic properties. The knowledge of the type of deterioration...
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