GB553434A - Means for automatically controlling an electrically driven winding gear - Google Patents

Abstract

553,434. Automatic control systems for winding equipment. ENGLISH ELECTRIC CO., Ltd., DOLAN, H., and AYRES, W. E. M. Aug. 15, 1941. No. 10378. [Class 38 (iv)] [Also in Group XXXVII] Speed.-In a winding equipment for a mine cage wherein a speed controller for the winding motor is operated in accordance with the difference between an E.M.F. or frequency determined by a master controller and a similar quantity proportional to the speed of the winding gear and in which the master controller is driven in accordance with the position of the cage near the end of the winding operation to cause stoppage of the winding motor, devices are introduced to provide and apply a value of the said E.M.F. or frequency for initially moving the speed controller to commence another wind. The master 'controller may regulate the said E.M.F. or frequency or may vary by a mechanical gear the ratio between the speed of the winding gear and the proportional E.M.F. or frequency. Where a potentiometer is operated by the master controller, which may be driven by an auxiliary motor and controlled by cams driven by the winding gear, as in Specification 509,261, [Group XXXVII], the cams may be initially clear of the cam follower to permit an initial movement of the master controller over the potentiometer and so provide an E.M.F. preferably the master controller is actuated by the cams above. Fig. 4 shows an arrangement wherein the cams operate two potentiometers in series and the junction 8 is connected through frequency determining means 6 and a change over switch 18 to the potentiometer members 10, 10b which are operated by the cams to the positions shown when the winding gear stops, and in the directions indicated when the gear is accelerating. The final movement of the gear opens a switch 23 and reverses the switch 18 so that a potential is applied to the frequency determining means 6 when a starting button 24 is pressed to commence the next trip. The brushes may be returned to the mid position 8 if a restarting operation is arranged to short circuit a portion of the appropriate potentiometer, or if a biasing booster in one of the leads from the potentiometer on switch 18 to the device 6 is arranged for excitation in one direction or other at starting. A suicide connection of this excitation may be used. The potentiometers may be in the field circuit of a generator supplying the device 6 and this generator may have a biasing winding suitably energized at starting. Fig. 5 shows an arrangement with a potentiometer element 10 and having only one operating cam therefor. The brush 10 lies near one end of the potentiometer when the wire gear is at rest and is driven in the direction indicated during acceleration. At the end of each trip a double pole switch 18 is operated. The device 6 may be a rotary converter, furnishing polyphase current to an electrical differential the output of which operates a motor driving the speed controller, or a motor driving a single phase element associated with a polyphase element driven by the winding gear and furnishing an output to drive the speed controller. Other alternative means for driving the speed controller differentially are described. In one of these the potentiometer supplies a reversible E.M.F. to excite a D.C. generator in series opposition with a generator driven by the winding gear and a motor driving the speed controller. Specification 548,123, [Group XXXVII], also is referred to.