Abstract: A piezo-electric type of assembly for effecting and interfacing relative motion between two surfaces. The assembly consisting of a first and a second transducer to be driven by electrical signals. Both transducers are coupled at one end to a low inertia member that is to make contact with a second surface. The first transducer controls this contact by moving the low inertial member relative to a high inertia member. The second transducer is coupled at the other end to a first surface. While the low inertia member is making contact with the second surface, activation of the second transducer causes relative motion between the first surface and the second surface due to frictional contact. The second transducer is reset while the first transducer causes momentary break of contact. The operation of this cycle has many applications.

Abstract: A power system controller design for controlling fault current or load flow current by applying a variable inductive impedance. The device comprising multiple stages of transformers connected such that their primary coils are in series and carry the primary power. Their secondary circuits containing a device for interruption of secondary current. The secondary circuit of each stage having a small part of the primary energy flowing through them. Under normal conditions the interrupter allows secondary current to flow, producing no impedance on primary side. Upon operation of interrupter, inductive impedance appears across primary. Operation of single stages producing low inductive impedance on primary circuit. Operation of multiple stages producing higher inductive impedance on primary circuit. In a preferred embodiment, the transformers have saturating cores such that operation of single stages saturates their cores, producing low inductive impedance on primary circuit.