公开(公告)号：DE3884929D1

公开(公告)日：1993-11-18

申请号：DE3884929

申请日：1988-12-01

Applicant: UNITED TECHNOLOGIES CORP

Inventor： NOVIS ARI M ,  LAMONTAGNE TROY J ,  ADAMS DON L ,  SIVAHOP ALBERT

IPC: B64C13/50 ,  G05D1/00 ,  G05D1/04

Abstract: An arrangement for controlling the position of a movable member, especially an aircraft control surface member, includes an operational amplifier and a capacitor connected in parallel to the amplifier. The control arrangement further includes a detector which detects the restoration of the supply of electric power following its interruption and generates a limited-duration pulse. This pulse is then used to close a switch, which is interposed between an input terminal of the capacitor and the ground, for the duration of this pulse, so that the capacitor is charged much more rapidly than otherwise. The output signal of the combination of the operational amplifier and the capacitor is supplied to an actuator for the movable member so that the extent of excursion of the movable member out of its desired position after the electric power supply has been restored is minimized.

公开(公告)号：AU2211088A

公开(公告)日：1989-03-16

申请号：AU2211088

申请日：1988-09-12

Applicant: UNITED TECHNOLOGIES CORP

Inventor： NOVIS ARI M ,  WRIGHT STUART C ,  ADAMS DON L

IPC: H02P7/06 ,  H02P7/00 ,  H02P7/288 ,  H02P7/282

Abstract: A method of and an arrangement for controlling the operation of a reversible D.C. electric motor including a winding having two ends each of which is connected to both the positive and negative terminals of an electric current source through respective control switches that can be selectively closed and opened in response to command signals to apply voltage differentials across the winding with attendant electric current flow through the winding in one or the opposite direction for operating the electric motor in one or the other of its senses of rotation with intervening rotation sense reversals utilize the original command signals for determining when the sense of rotation reversal would result in an excessive electric current flow through the winding. In such a case, the original command signals are temporarily replaced by substitute command signals of such a character that both of the winding ends are connected through the respective control switches to only one of the electric current source terminals with attendant dynamic braking of the electric motor.