Control arrangements
AssigneeThe Marconi Company Limited
InventorRoderick Carey Baxter
Life of this patent
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Abstract
A control arrangement is described for angularly positioning a member such as an aerial structure in which a potentiometer has a continuous circumferential winding with two sets of tappings of at least two tappings and at least three tappings respectively the relative angular position of the two sets of tappings being variable in dependence upon the angular position of the member. Potentials are applied to one set of tappings and the potentials at the other set are compared with respective ones of a set of preset voltages representative of the desired position of the member. The member is driven to change its angular position until the result of comparison indicates that the desired position has been reached.
Claims16
A control arrangement for angularly positioning a member comprising a first potentiometer having a continuous circumferential winding with two sets of tappings which include at least two tappings and at least three tappings respectively, whose relative angular position is variable in dependence upon the angular position of said member;
- means for applying predetermined potentials to one set of tappings whereby a unique set of potentials is established at the other set of tappings for each angular position of said member, means for generating a selected set of potentials corresponding to one unique set of potentials established at said other set of tappings when said member is in a particular angular position, and means connected to said other set of tappings and to said means for generating an error signal indicative of deviation of the member from said particular angular position including means for comparing each of the said voltages at the other set of tappings with respective ones of said selected set of potentials.
A control arrangement for angularly positioning a member, comprising in combination:
- a potentiometer having a continuous circumferential resistance member;
- a first set of tappings connected for rotation in fixed relation with said member and slidably contacting said resistance member;
- a second set of tappings contacting said resistance member at fixed, circumferentially spaced points thereof;
- means connected to one set of tappings for applying fixed predetermined potentials thereto, the circumferential spacing of said first set of tappings and the circumferential spacing of said second set of tappings being such that said predetermined potentials applied to said one set of tappings establishes a unique set of potentials at the other set of tappings for every angular position of said member;
- means for generating a selected set of potentials corresponding to one unique set of potentials established at said other set of tappings by a particular angular position of said member;
- comparator means connected to said other set of tappings and to said selected set of potentials for creating on error signal so long as the unique set of potentials at said other set of tappings does not correspond to said one unique set of potentials;
- and
- means for rotating said member in response to said error signal.
Dependencies are inferred from the claim text.