A Direct Torque Controlled induction motor drive based on control of tangential and radial component of stator flux vector

In this paper a constant switching frequency Direct Torque Control induction machine control algorithm is presented. The algorithm is based on manipulating both radial and tangential component of stator flux vector. Stator flux amplitude is calculated from torque and rotor flux references, while its angle comes from an original torque regulator. Control of torque is achieved by stator flux acceleration control. In flux weaking regime, the only control variable is stator flux angle, which is used to maintain desired torque when voltage is at the limit. Proposed solution is verified through simulation and experiment.