CONTACTLESS DC DRIVE Russian patent published in 2003 - IPC

FIELD: electrical engineering; automatic- control and conversion systems. SUBSTANCE: contactless drive has speed transducer incorporating disk perforated over its perimeter and fixed in position on electric motor shaft. Radiation source is mounted on one end of disk; connected on other end of the latter are photodetector connected to motor speed booster-shaper, pulse shapers, double-input and single-output phase-frequency comparator connected to speed control device of bridge-type switch control circuit. One input of phase- frequency comparator is connected to output of first pulse shaper whose input is coupled with output of speed transducer and its other input, with output of second pulse shaper, drive control master frequency being supplied to its input. EFFECT: enhanced stability of drive speed and operating reliability of drive. 2 dwg