Required measurement accuracy in high quality torque controlled motor drives

The digital implementation of field oriented induction motor drive controls require digital measurements, or measurements digitized by analogue to digital converters. The limited resolution in digital measurements and in analogue to digital converters causes uncertainty in the calculation of the developed torque. Demands for torque control with very high linearity from torque reference to developed torque gradually evolves. The resolution necessary, in the digital measurements, to perform torque calculation of a desired accuracy is analysed.