A phasor speed control of a single or two phase induction motor

This paper is focused on the speed control of a single or two phase induction motor using a diametrical inversion (DI) of the stator voltages. The changes in the speed error sign are responsible for each DI which inverts the stator voltage phasor and its angular velocity. The main and the auxiliary windings are always connected and thus the speed error sign allows to determinate the rotating field direction. The motor is fed by a rectifier associated with a three-phase inverter. The core of the drive command it´s a 16-bit dsPIC device, which receives the speed error sign and generate the appropriate PWM reference voltages signs to the three-phase inverter. Simulation and experimental results allow assume a good performance.