Двигатели с электромагнитной редукцией частоты вращения с вентильным подмагничиванием

Abstract

The paper presents design features of motors with electromagnetic reduction of rotation frequency with switched magnetization. The harmonic composition of the magnetic field of such motors is considered when using fractional slot windings. Analytical expressions for the magnetomotive force of the winding are given and data on operating harmonics for reluctance motors and motors with switched magnetization at different numbers of phases are presented. The principle of operation of such machines is described. The method of harmonic permeances was used to calculate the magnetic field in the air gap. As a result, analytical expressions were obtained for the distribution of the magnetic field in the air gap and the electromagnetic torque. After analy¬zing the expressions obtained, the paper presents the conditions under which the formation of an electromagnetic torque occurs. The design and the operation principle of motors with electromagnetic reduction of rotation frequency with switched magnetization is described and compared visually with reluctance motors. It illustrates a better use of the active volume in machines with switched magnetization. In addition, a comparison between motors with switched magnetization and classical electric machines (synchronous, induction and direct current machines) in terms of the utilization of an active volume factor for different power values is given.