Techniques of Armature Magnetic Induction Vectors Forming for Two-Phase Four-Sectional Brushless Direct Current Motor

Abstract

Systematization of techniques to form armature magnetic induction base vector sets for two-phase brushless direct current (DC) motor with four-sectional winding is proposed. Each set is defined by section connection scheme and phase energizing technique; it has an influence on motor stall torque. The armature equivalent circuit is coordinated and considered on a complex plane, the motor’s phases are directed along its axis. The techniques are grouped by participation of the phases, by sections within one phase, in the base vector forming process during an intercom mutation interval. A terminology is introduced which allows to consider base vector forming techniques from unified positions for n-phase brushless DC machines applied on perspective vehicles. A name for each set is proposed and a mathematical description is obtained. Amplitude values of the vectors at different connection schemes, at different energizing techniques within one scheme, are obtained and collated one another. With the help of the proposed systematization the quantity of possible base vector sets at a certain connection scheme is derived, their graphical representation diagrams are built. Based on the obtained results, vector forming techniques characterized by different power efficiency are discovered. Recommendations for drive developers to use a certain technique are given.