SERVO AMPLIFIER FOR ACCURATE POSITIONING

摘要

PURPOSE:To improve the gain at a high frequency range and the phase characteristic of a servo system by inserting phase advancement compensating amplifiers between the positional deviation value of an objective position inputted from a numeral control device and a current position and a speed adding point and between the speed adding point and a current adding point. CONSTITUTION:The 1st phase advancement compensating amplifier circuit 13 having advancing phase compensating and amplifying functions is inserted between a D/A converter 9 for converting a phase deviation value into an analog value and the speed adding point 8 and the 2nd phase advancement compensating amplifier circuit 12 is inserted between the adding points 7 and 8 instead of a delay phase compensating amplifier circuit. Each of the circuits 12, 13 consists of a resistor, a capacitor and an operational amplifier. Respective constants are determined so that the maximum angle (40-60 deg.C) of the phase advancement is set up to 150-200Hz, and the gain is adjusted by a resistor R4.