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Direct torque control

DTC of ac drives is based on stator voltage control; hysteresis torque and flux controllers determine the errors which govern the selection of the required voltage space vectors to be applied to the motor. A simple switching logic is used to either increase or decrease the flux, and increase or decrease the torque, or effect no changes. Move the control points A, B, C, and D to cover the 6 sectors of the plane and observe the correcting flux increments needed to produce these effects. Based on these observations, develop the underlying switching table: the 4 rows represent the specified active operating conditions and the 6 columns denote the numbered sectors; the entries are the required basic vectors v.

© M. Riaz