Voltage Vector Controller for Rotor Field-Oriented Control of Induction Motor Based on Motional Electromotive Force

According to the principle of electromechanical energy conversion and reference frame transformation theory, it is demonstrated that rotor field orientation decouples not only flux linkage and torque but also rotor transformer electromotive force (TEMF) and rotor motion electromotive force (MEMF). The rotor MEMF is controlled in field-oriented control (FOC), direct torque control (DTC) and direct self control (DSC). The control of torque and speed in variable-frequency induction motor drives can be achieved by control of rotor MEMF. Moreover, a voltage vector controller for rotor field-oriented control of induction motor based on control of MEMF is presented and it can achieve not only constant torque control but also constant power control. The results of simulation show that the proposed control scheme has good dynamic performance and an effective new way for the high performance speed control of induction motors is provided.