METHOD TO CONTROL ROTATION OF DRIVE SHAFT OF PNEUMATIC OR HYDRAULIC SERVO DRIVE AND SUCH DRIVE Russian patent published in 2003 - IPC

FIELD: mechanical engineering. SUBSTANCE: proposed method includes conversion of reciprocating motion of two actuating mechanisms into rotation of drive shaft with control of travel of each actuating mechanism by separate control signal, forming of master signal and forming from said signal and second command signals, measuring drive shaft turning angle and converting it into first and second feedback signals proportional, respectively, to sine and cosine of drive shaft turning angle and forming first and second control signals by decreasing corresponding command signal by value of corresponding feedback signal. Master signal is formed proportional by to preset time-change drive shaft turning angle, and first and second command signals are formed proportionally to sine and cosine of preset drive shaft turning angle. Pneumatic or hydraulic rotary drive contains first and second actuating reciprocating mechanisms whose output links are coupled with drive shaft through device converting reciprocating motion into rotation, drive shaft current turning angle-data transmitter, first and second command signal shaper and control circuits of first and second actuating mechanisms, first control circuit including first subtracting unit and sine converter, and second control circuit, including second subtracting unit and cosine converting. Outputs of first and second subtracting units are connected to working medium distributors of corresponding actuating mechanism. First and second outputs of command signal shaper are connected to first inputs of first and second subtracting units. Output of drive shaft current angle-data transmitter is connected to second inputs of first and second subtracting units, respectively, through sine and cosine converters. First and second command signal shaper includes drive shaft time-change angle setter, sine and cosine converters. Output of drive shaft time-change angle setter is connected to inputs of sine and cosine converters whose outputs being, respectively, first and second outputs of command signal shaper. EFFECT: improved smoothness and accuracy of conversion of reciprocating motion into rotation. 3 cl, 1 dwg