Magnetic Field of a Machine with Anisotropic Rotor Magnetic Conductance

Abstract

Different technologies for manufacturing the rotors of reluctance electrical machines with anisotropic rotor magnetic conductance—with longitudinal batching of the pole packages of the rotor and transverse batching of the rotor package with special cutouts—are analyzed. It is shown that the energy efficiency of reluctance machine with longitudinal batching of the rotor pole package significantly excels the energy efficiency of reluctance machine with transverse batching of the rotor pole package. The equivalent circuit of the magnetic circuit of reluctance electric machine with anisotropic magnetic conductance of the rotor with longitudinal batching of the rotor pole package is presented. The equations of magnetic fields in the zone of longitudinal and transverse magnetic conductance are written. Based on the proposed equivalent circuit, differential equations are derived, the solutions of which generate the functions of transverse magnetic flux depending on the angular coordinate of the machine, the anisotropic magnetic conductance of two-pole rotor of which is achieved by its longitudinal batching. The distribution of magnetic voltage between stator and rotor along the air gap is defined. The obtained analytical relations make it possible to determine the longitudinal and transverse magnetic conductance of the machine. The experimental studies of determination of magnetic conductances according to the presented procedure confirm the theoretical computations. The absolute error in determining the magnetic conductances by derived analytical relations and physical simulation does not exceed 7%.