Electromagnetics

Eddy current losses

The Eddy current losses with suitable examples and sketches are discuss here advanced.When the magnetic flux penetrating continuous conducting bodies undergoes changes, then in accordance with the law of electromagnetic induction, electromotive forces are induced and electric currents appear. The electric charges that form these currents move along closed circuits in planes normal to the …

Magnetic field energy

A magnetic field contains energy distributed over the space occupied by the field. It corresponds to the work expended by an electric current when creating a field. Fig. 2.4 Let the magnetic field be created by the current flowing through the winding of the toroidal coil with the number of turns w and resistance R …

Magnetization and magnetization reversal of ferromagnets

Iron, cobalt, nickel and some other materials and alloys constitute a special group of substances by the nature of the reaction to the action of a magnetic field. In an external relatively weak magnetic field, they are able to acquire a large magnetization. These metals are united by the name of ferromagnets, and the phenomena …

Maxwell’s equations

The conversion of electrical energy in machines is carried out using electromagnetic fields, the mathematical description of which in the most general form corresponds to Maxwell’s equations. The first equation establishes the relationship between electric current and magnetic field strength,Maxwell’s equations where and are the vectors of the magnetic field strength and elementary displacement along …

Magnetization

A direct current i flowing in a closed circuit limited by a small area S Δ is called a magnetic dipole (Fig. 1.4). It has its own magnetic field, the parameters of which are determined by the magnitude of the current and the diameter of the circuit. Magnetization Fig. 1.4 A magnetic dipole can be …

Magnetic flux

Magnetic flux is the flux of the magnetic induction vector through any surface. It is defined as where is the vector corresponding to the elementary area ds of the surface S and directed normally with respect to it (Fig. 1.3, a) ds If the magnetic induction is normal to the surface ds, then those. magnetic …

Magnetisation Fundamentals

At first magnetism magnetic material like iron is characterize by the property that is constituent atoms may have individual magnetic moments. Atomic Magnetisation magnetism begins from atoms due to below explanation Magnetic field is produce by orbit of electrons and spin of electrons Magnetisation of Iron – magnetism A magnetic material like iron is characterized …

Magnetic Materials

Types of Magnetism -magnetic material At first Magnetic materials Material may be classified into one of five categories depending on its magnetisation characteristics. Diamagnetic materials Paramagnetic materials Antiferromagnetic materials Ferromagnetic materials Ferromagnetic materials Also Diamagnetic, Paramagnetic and Antiferromagnetic material were non-magnetic material. Also Ferromagnetic and Ferrimagnetic materials magnetic materials. Diamagnetic materials A material whose relative …