Abstract: Method and apparatus for accelerating a large inertia load from rest to a predetermined speed of rotation by means of a synchronous dynamoelectric machine. A synchronous dynamoelectric machine, such as a turbine generator, which is mechanically coupled to a gas turbine prime mover, is started synchronously to bring the gas turbine up to a speed which exceeds its stall speed under load. The rotor field winding of the synchronous dynamoelectric machine is connected to receive direct current excitation from a rotatable rectifier assembly of a brushless exciter. During starting, a quadrature axis winding disposed around the stator of the brushless exciter is energized by single phase alternating current. Alternating current excitation is induced by transformer action within the rotor armature winding of the exciter and is applied to the rotor field winding after being rectified by the rotatable rectifier assembly.

Abstract: A speed regulator and control system for controlling a motor from a polyphase AC source includes a data processor and a regulator and rectifier control interfacing the data processor with a controllable rectifier driving the motor is disclosed. The regulator and rectifier control, under control of the data processor, selectively transfers system parameters to the data processor, receives a calculated value proportional to firing angle from the data processor and supplies firing pulses to the rectifier to selectively connect each phase of the AC source to the motor as calculated by the data processor.

Abstract: A method of driving a door of an automatic door assembly by a linear motor mounted within the automatic door assembly. The method comprises the steps of driving the door by at least a normal propulsion force of the linear motor, driving the door by a propulsion force which may range from zero to nearly the normal propulsion force, and then driving the door by the normal force again thereby reducing the speed of travel of the door during its opening and closing intervals.

Abstract: An electrical branch circuit for use as in a swingable door of an automotive vehicle is shown having an electrical load connected to first ends of electrical conductors which, in turn, at their respective other ends are connected to terminal means mechanically connectable to related circuit means, resistor means is connected into at least one of the electrical conductors as to be generally between the electrical load and the terminal means.

Abstract: The armature of the model electric locomotive motor is connected as one arm of a bridge circuit having a D.C. supply voltage. When the armature is held to prevent rotation, the bridge is balanced by means of resistors in the other arms so that no voltage appears across the output. When the armature then rotates the voltage across the bridge output is the back EMF produced by the rotation of the armature. A variable reference voltage obtained from the same D.C. power source is introduced opposing the back EMF and the resultant is used to control the current between the power supply and the bridge. The armature back EMF is thereby held by the bridge balance essentially equal to the reference voltage and if a heavy load is applied to the armature shaft the resultant bridge unbalance will retain the desired armature rotational speed constant irrespective of load changes, but variable directly with the applied reference voltage.

Abstract: The invention relates to a tape handling device associated with a picture-taking (recording) or reproducing (replay) device having a drive motor, a transmission gear to be actuated by the motor, a reversing device for reversing the sense of rotation of the drive consisting of the motor and gear train, and a control device likewise actuated by the motor.

Abstract: A system is disclosed for enabling a user to start an engine from a remote location, utilizing a receiver for receiving a command signal from a remote transmitter operated by the user, the receiver generating signals to control operation of the starting system. The system enables the user, from the remote location, to effect selective momentary pumping of fuel into the engine prior to activation of the starting operation, and then to start the engine. The system may include apparatus for maintaining the throttle of the engine substantially open until the engine is started and then closing the throttle to an idling position, with automatic momentary pumping of additional fuel into the engine at predetermined intervals during the running of the engine in accordance with the starting operation. Protective apparatus may be included with the system to prevent activation of the starting operation at any time a manually controlled starting switch has been activated prior to activation of the starting system.

Abstract: A periodic electric signal component in a variable input signal of a servo system is compensated by providing an electric signal corresponding in wave form to the periodic signal component, synchronizing the corresponding signal with the periodic electric signal component and compensating the periodic electric signal component with the synchronized corresponding signal.

Abstract: A motor is electrically coupled to a power source through a motor starter. The motor is selectively operated by a relay to connect and disconnect the power source to the motor. A counter accumulates a count of motor failures and produces an inhibit signal should the frequency of occurrence of such motor failures exceed a given level. The relay is operated by an inhibit signal to cause the motor starter to disconnect the power source from the motor.

Abstract: A control circuit for a direct current motor having separately excited armature and field windings and operable in both the constant torque and constant horsepower modes includes a speed control circuit having a transfer characteristic providing an extremely high gain at lower frequencies and a low gain, for example unity, at higher frequencies and further includes means to reduce the low frequency gain when motor operation is switched from the constant torque to the constant horsepower mode.

Abstract: A control unit is connected, via a data bus, to a plurality of remote field controllers, each of which is in turn connected to a motor starter and status contacts of a respective valve or pump. Binary codes are communicated between the control unit and field controllers to convey status information, regarding a valve or pump, to the control unit. Likewise, command codes are conveyed from the control unit to a pump or valve to effect a selected operation.

Abstract: A magnetic tape-transport system wherein the speed of a capstan used to transport magnetic tape past a read-write head is controlled utilizing digital techniques. A comparator is provided a first digital input indicative of desired speed and a second input from a counter which counts up or down until the count equals the first digital input. The counter output is converted to an analog voltage and applied to a summing junction point which also receives a voltage which is proportional to the instantaneous speed of the capstan drive motor. The voltage difference at the summing junction point is used to drive the capstan drive motor.

Abstract: An apparatus for insuring that the rotational speed of a spindle on a machine is prevented from exceeding a selected programmed speed. The apparatus is comprised of means for continuously receiving pulsed signals indicative of the instantaneous rotational speed of the spindle over a timed cycle, wherein the cumulative signal within the receiving means at the end of each timed cycle is representative of the actual rotational speed of the spindle.

Abstract: Electrically operated means for indicating the fork height on a fork lift truck are shown. Heights less than a predetermined minimum are not shown in order to provide a better indication at heights which are difficult for the operator to estimate. Control means are also shown for automatically stopping the forks at a height presettable by digital and by analog means.

Abstract: A multi-level support structure contains plural power driven turntables on each level and each turntable carries a plurality of wind powered electrical generator units which are pivotally secured to the turntable and electrically coupled in a power distribution system through slip ring elements. Each generator unit has a rudder or wind vane causing the driving blades to face the wind. The generating units are readily removable from their turntable supports for repair and replacement by functioning units. The plant may be sized for commercial or home application.

Abstract: A speed control system for an induction motor controlled by a converting arrangement coupled with a commutatorless motor which operates without commutation failure notwithstanding wide variations in the speed of the commutatorless motor. The speed control system includes an arrangement for maintaining the value of a direct current signal of the converting arrangement less than the maximum current value for ensuring proper operation of the converting arrangement.

Abstract: A plurality of coaxial pins are cooperatively arranged to provide a pin-joint coupling for three or more interrelated components and provide the capability of removal of one component without disturbing the adjustment and operation of the other components.

Abstract: A modular hydroelectric power plant which converts energy of water flowing in a stream into electric power. The plant comprises a plurality of modules which are removably mounted on piers embedded in a river or stream bed. Each module comprises a turbine over which water flows to rotate the turbine, and turbine rotation is converted into power by a generator attached thereto. The generator is removably mounted on the module. Insertion of the plant in a stream or river does not significantly disrupt flow therein, and locks are provided to assist vehicles in transversing the plant area of the river or stream.

Abstract: A speed control system for a chairlift which reproduces automatically at the arrival of a seat in the disembarking station the speed which this seat had in the embarking station. The speed information is applied to a shift-register or a magnetic recorder which restores this information to control the speed at the arrival.

Abstract: An electric power generating plant includes at least two compressors having matched operating characteristics, alternators and turbines and boilers having combustion chambers connected to the turbines. The compressors, alternators and turbines are operatively interconnected such that during no power demand periods the compressors are driven in a series arrangement by the alternators, functioning as electric motors, to store a supply of pressurized air in an air storage tank, and during normal and peak power demand periods the turbines, supplied by the combustion chambers of the boilers, drive the compressors, functioning in parallel relationship, which feed respective ones of the boilers with enriched air and a gas recycled after expansion by one of the turbines. During the normal and peak power demand periods pressurized air previously stored in the air storage tank by the compressors is fed to the combustion chamber of one of the boilers.