| 摘要 |
1. System for controlling linear displacement, said system comprising a DC motor in a position servocontrol loop in which a position error signal is used to control the motor, wherein, on the basis of the error signal, a control voltage is generated having the form of a sequence of pulses having a fixed period, a variable duty ratio, and a duration dependent on the difference between the instantaneous position of the motor shaft and the set stop position thereof, characterized in that said system comprises means located is the DC motor control chain (3) ; pulse generator means (5), the pulses delivered by said pulse generator means having a mean value which is proportional to the instantaneous position of motor shaft and the set stop position thereof, said system further having is a body (60) ; a gear train (61) meshing with the motor shaft (62) and suitable for transmitting rotation of the motor shaft at a predetermined step-down ratio ; a sleeve (63) fixed to rotate with one of the gear wheels (613) in said gear train, said sleeve being rotatable about an axis (DELTA) which is parallel to the direction in which linear displacement is to be controlled and being fixed in translation along said direction relative to said body ; and a linear displacement control rod (64) screwed into said sleeve and driven in linear displacement by the sleeve when the sleeve (63) rotates. |
