Single-phase induction motor drives with direct torque control

Although many techniques for high performance torque and flux control in three-phase induction motors are already available, most of them were not generalized for application in single-phase induction motor drives. In this paper some high performance single-phase induction motor drive systems are investigated. A stator fixed reference frame dq model is used to develop a direct torque control scheme for single-phase machines having main and auxiliary windings. A stator flux oriented reference frame control scheme is also proposed. In both strategies presented no speed or position signal for the torque control is necessary. Simulation results are provided to show the techniques effectiveness.