Magnetic noise reduction in field oriented controlled induction machine

This paper presents electromagnetic forces investigation of variable speed induction motor. Initially electromagnetic forces of induction motor at nonsinusoidal power supply are analyzed. Proposed radial electromagnetic forces math model allows to take into account higher time harmonics of voltage source inverter supply. Then based on analysis of electromagnetic forces spectral content field oriented control scheme of induction motor drive is proposed. A distinctive feature of this scheme is radial electromagnetic forces minimization at any operating point by rotor flux optimization. Experimental examination of proposed scheme by emulating in Matlab shows reducing of radial electromagnetic forces versus conventional field oriented control.