Abstract: A control system moves an inductively controlled multi-phase motor in a forward or reverse direction. The motion may be in steps or it may be a continuous rotation. Dynamic braking of the rotation in either direction, either in steps or continuous rotation, is achieved by activating one or more phases of the multi-phase motor that lag the selected phase. Detent is accomplished by deactivating the lagging phase or phases at a prescribed time so that the selected rotational phase will then be applied to stop the motor at the desired motor pole.The speed at which the motor is moving when the lagging phase or phases are selected is measured by a velocity correction circuit that causes more current to be sent through the motor coils associated with the lagging phase or phases when the velocity is high than when it is low.

Abstract: A switching regulator power supply operates at a high frequency with a low loss, light weight ferrite core transformer. The transformer primary is selectively connected across a DC source of rectified AC power for a predetermined time to provide energy storage followed by a predetermined time period of disconnect to provide energy transfer by way of transformer flyback. The energy storage and energy transfer cycles are initiated by a novel, self-starting timing circuit. The power parameters in at least one of a plurality of secondary windings are sensed and compared with a reference standard. Any error, in the form of a pulse-width-modulated pulse is coupled back to a primary control for adjustment of the energy storage time period. The coupling is done through a sealed opto-electronic coupler, this providing a DC coupling.

Abstract: A control system moves an inductively controlled multi-phase motor in a forward or reverse direction. The motion may be in steps or it may be a continuous rotation. Dynamic braking of the rotation in either direction, either in steps or continuous rotation, is achieved by activating one or more phases of the multi-phase motor that lag the selected phase. Detent is accomplished by deactivating the lagging phase or phases at a prescribed time so that the selected rotational phase will then be applied to stop the motor at the desired motor pole.The speed at which the motor is moving when the lagging phase or phases are selected is measured by a velocity correction circuit that causes more current to be sent through the motor coils associated with the lagging phase or phases when the velocity is high than when it is low.

Abstract: A circuit having a gated, symmetrical switch is provided for insertion between an AC source of power and a load, and prevents a surge current from entering the load when the AC input is initially applied. A symmetrical negative resistance device that begins conducting at a prescribed voltage and remains on as a constant voltage regulator until the AC input voltage drops below a sustaining value is connected to provide the prescribed voltage to the gate control of the gated symmetrical switch. An RC circuit controls the length of time required for the AC input voltage to reach the prescribed voltage at the input to the symmetrical negative resistance device. At least part of the resistance in the RC circuit is of the negative temperature coefficient type, resulting in the resistance value decreasing as the temperature of the negative temperature coefficient device increases, thereby shortening the time after which the prescribed voltage to the symmetrical negative resistance device is applied.