Means for controlling the speed of a cable
AssigneeASEA Aktiebolaget
InventorSten Elvin
Life of this patent
Estimating the term…
Abstract
The speed of a cable being unwound and wound onto a cable drum disposed on a movable vehicle is controlled by developing a control signal from an error signal which is the difference of an actual value representing the drum speed and a reference value which contains two components, one proportional to the vehicle speed and another proportional to the position of a tensioning means associated with the cable drum.
Claims7
Apparatus for controlling the speed of a cable when being unwound and wound on a cable drum which is disposed on a movable vehicle said cable drum having associated therewith drive means comprising
- a. means for measuring the speed of the vehicle and providing a first output signal proportional thereto;
- b. means for measuring the speed of rotation of the cable drum and providing a second output signal proportional thereto;
- and
- c. control and regulating means having as inputs said first and second signals and providing as an output a third signal which is related to the difference therebetween, said output coupled to control the drive means for said cable drum.
Apparatus for controlling the speed of a cable when being unwound and wound onto a cable drum which is arranged on a movable vehicle comprising:
- a. a DC motor coupled to the cable drum;
- b. a converter providing drive inputs to said DC motor;
- c. a spring loaded traversing wheel over which the cable runs;
- d. means for measuring the vehicle speed and providing a first output signal proportional thereto;
- e. means for measuring the speed of rotation of the cable drum and providing a second output signal proportional thereto;
- f. means for measuring the deviation of said spring loaded wheel from a predetermined position and providing a third output signal proportional thereto;
- g. means for finding the difference between the sum of said first and third signals and said second signal to develop a difference signal;
- and
- h. a proportional integral controller having said difference signal as an input and providing its output as a control input to said converter.
Dependencies are inferred from the claim text.