GB661963A - Anti-hunting circuit for an electrical regulator - Google Patents

Abstract

661,963. Automatic voltage control systems. BENDIX AVIATION CORPORATION. Jan. 26, 1949 [April 19, 1948], No. 2198/49. Class 38 (iv). A voltage regulator for an A.C. generator 21, 23 excited by a D.C. generator 1 comprises a carbon rheostat 45 connected in series with the field winding 8 of the exciter generator 1 and controlled by a main electromagnetic winding 75 in response to voltage variations across output lines 30, 31, of the A.C. generator and by an antihunting winding 53. A further control winding 50 acting in opposition to windings 75, 53 effects compensation for load variations on the A.C. generator. The winding 75 is fed from a rectifier bridge 66 supplied from the lines 30, 31 through a calibrating resistance 62. The winding 50 is connected in series with the field 8 and rheostat 45 across the exciter armature while the antihunting winding 53 is connected across the field 8 and winding 50 in series with lamps 58 the resistance of which increases with current flow to provide a delayed compensation on current changes in the winding 53 and thereby effect an antihunting action in the operation of the rheostat 45. A secondary antihunting effect to provide for conditions of high generator speed and lowfield current is derived by feeding a differential component of the current in the main winding 75 to the antihunt winding 53 via a condenser 85. Specification 619,955, and U.S.A. Specification 2,427,805, are referred to.