PT  - JOURNAL ARTICLE
AU  - BALARA, Milan
TI  - 
DP  - 2009 Jul 1
TA  - Trends in education
PG  - 386--389
VI  - 2
IP  - 1
IS  - 18058949
AB  - The speed control system of an externally-excited DC motor without tachogenerator (TG) is actually a discrete control circuit where the motor current is intentionally cut-off so that the induced armature voltage may be sensed. This voltage (proportional to the angular speed of a motor) is stored in analog memory during one sample period and processed by the speed controller. That's how the speed control of a motor without TG is carried out - angular speed is sensed by the motor itself.