Analysis of a four-phase induction machine with direct torque control

In this work the design and control of a four-phase induction machine (4P-IM) is addressed. The 4P-IM is controlled using a four-phase voltage source inverter (4P-VSI) with a generalization of the classic direct torque control (DTC) scheme. An analysis of the available valid switching states and voltage space vectors is developed and a switching table is obtained. Finally, the system's fault tolerant characteristics are briefly considered for operation with gate suppression in one IGBT. In this case, operation is still possible with the use of switching strategy that employs the remaining space vectors available during the fault.