CABLE REELING SYSTEM

摘要

A reel system for a mobile installation (10) comprising an AC motor which, via reduction means (20), drives a reel carrying cable (16), the reel system further comprising a first sensing means (36) providing a motor shaft position signal; a first control means (25), which is responsive to a desired torque signal and the motor position signal, and operable to effect continual instantaneous modification of the stator current of the motor (18) to provide the desired torque output at the motor shaft, characterised by the system further comprising a second sensing means (21) providing a signal representative of the speed of the cable (16) reeling onto, or paying out from, the reel (12); and a second control means (55), which is responsive to speed signals derived from the first and second sensing means (36, 21) and a desired tension signal, and operable to adjust the desired torque signal so as to maintain the tension in the cable (16) at a substantially constant level defined by the desired tension signal.