RT Journal Article
SR Electronic
A1 BALARA, Milan
T1 
JF Trends in education
YR 2009
VO 2
IS 1
SP 386
OP 389
UL https://tvv-journal.upol.cz/artkey/tvv-200901-0088.php
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.