A comparative study of field-oriented and direct-torque control of induction motors reference to shaft-sensorless control at low and zero-speed. - Thomas M. Wolbank; A. Moucka; Juergen L. Machl (ISIC, 2002)

Closed-loop compensating sensors versus new current derivative sensors for shaft-sensorless control of inverter fed induction machines. - Thomas M. Wolbank; Juergen L. Machl; Hans Hauser (IEEE Trans. Instrum. Meas., 2004)