| 摘要 |
<p>1327400 Automatic control systems SIEMENS A G 2 Nov 1970 [15 Nov 1969] 52084/70 Heading G3R A control system comprises a controller having two input paths receiving an error signal in one of which is an integrator 12 preceded by a limiter 9 and in the other is a derivative-action device 10. The limiter substantially prevents temporary disturbances from affecting the integrator output. The arrangement is applied to apparatus for winding a fibre in which fibre tension is kept constant. Variations in tension are detected by a weighted pulley 3 connected to a potentiometer 7 whose output is normally zero, but changes in tension produce a positive or negative error voltage which is applied to the system of the invention. The integrator output is made unidirectional by limiting it to zero with respect to one polarity, and is applied to an inverting amplifier 14 which produces an amplified negative signal when a positive signal is applied. It comprises two transistors, Fig.3 (not shown), and is biased by -ei so that its output decreases from a maximum value. The signals are compared at a summing junction 11 with the output of a tachogenerator 17 and the resultant forms the desired value for a motor current control loop 16, 19, 20 whose output controls the triggering of a regulator 22 in the motor circuit. Mention is made of the control of a plurality of motors, with a single control potentiometer to adjust all their maximum speeds. Controller 16 has a proportional plus integral action.</p> |
