INDUCTION-MOTOR DRIVE CONTROL GEAR Russian patent published in 2001 - IPC

FIELD: controlling speed of machines and miscellaneous mechanisms equipped with induction motors. SUBSTANCE: newly introduced in control gear is adaptive speed governor that has common bus connected to microprocessor, random- access memory, read-only memory, address selector, and data transceiver. Output bus of the latter is connected to two data registers, series-connected analog-signal multiplexer, analog-to-digital converter, and digital-signal input device whose output is connected to input bus of transceiver. It also has digital-to-analog converter connected to first-register output, as well as counter whose input is connected to output of feedback signal shaper and output, to second input of digital-signal input device; output of digital-to-analog converter is connected to input of speed governor; outputs of address selector are connected to enable inputs of registers and to address inputs of digital-signal input device; analog-signal multiplexer inputs are coupled with phase-current sensors of induction motor and address inputs, with second-register output. EFFECT: improved transient characteristics of electric drive due to damping elastic vibrations. 2 dwg