AN ALGORITHM FOR DIRECT TORQUE CONTROL OF FIELD-ORIENTED ASYNCHRONOUSMOTOR-DRIVES

The dynamic behaviour of fully digital control systems is strictly rel ated to the duration of the sampling interval. The minimum length of t his period depends exclusively on the time needed for the execution of all the required operations. Therefore, the minimization of computing time is one of the most important goals to be achieved in order to im prove the accuracy of electrical drives with fully digitalized control systems. The best results can be obtained using: fast programming lan guages and short sets of computing instructions. This god is achieved using a proper feeding algorithm for asynchronous motor drives called ''direct'', because it links directly the requested torque and magneti c flux to the input voltages.