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4125884 |
Apparatus for detecting subsynchronous current in power systems
Apparatus for detecting the presence of subsynchronous current components in an electrical generating or transmission system is disclosed. Input signals, representative respectively of line voltage...
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4119861 |
Starting apparatus for gas turbine-generator mounted on electric motor driven motorcar
A starting apparatus for a gas turbine-generator mounted on an electric motor driven motorcar includes a gas turbine and an A.C. generator with A.C. output terminals coupled directly to the...
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4117389 |
Low frequency high output alternating current generating device
A low frequency, high output alternating current generating device comprising a high frequency generator having an output winding capable of generating a continuous wave high frequency output with...
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4087698 |
Alternating current power generating system
A system for generating alternating current of selected voltage at a target frequency includes a plurality of A.C. generators, at least one of which has a rotatably mounted stator. A prime mover...
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4080559 |
Torsional protective device for power system stabilizer
Power system stabilizers are used in the excitation systems of large shaft driven synchronous dynamoelectric machines for the purpose of enhancing the dynamic stability of power generating systems....
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4079307 |
Alternating current generating device
An inductor-type high frequency generator with alternating current field excitation and frequency changing output means. An excitation winding provides current for the field winding by way of a...
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4074180 |
Electric current generator arrangements
An electrical generator arrangement includes a variable-ratio drive device, an alternator driven by the drive device and a generator which is separately excited by the alternator output. An...
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4035712 |
Electrical generating apparatus
A constant frequency a.c. generating system includes an alternator driven at a variable speed. A rectifier provides a d.c. supply for a rotary inverter. To maintain the voltage and frequency of the...
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3999115 |
Dynamic stabilizer for synchronous machines having torsional oscillations and method
A dynamic stabilizer which includes a voltage generator connected in series with the output terminals of a synchronous AC generator provides compensation for voltages produced by the main AC...
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3984755 |
Voltage regulator
A direct current ramp potential signal which is produced in synchronism with each half cycle of the alternator output voltage and increases in magnitude within a predetermined range during each...
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3984750 |
Alternator-rectifier unit with phase winding and rectifier sets subject to series-parallel switching
Separate three-phase windings are connected to individual rectifiers arranged for series-parallel switching to improve the current-voltage output characteristic. The common exciter winding is fed...
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3982170 |
Variable speed, constant frequency induction generator system
The disclosed voltage generating system includes certain known components, such as an induction machine driven as a generator, the output connections of which are coupled to the normal load...
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3975646 |
Asynchronous tie
Two cascaded induction machines provide asynchronous power transmission between two independent generating networks. The shafts of the two induction machines are mechanically connected for...
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3832625 |
ELECTRICAL POWER GENERATING ARRANGEMENT AND METHOD UTILIZING AN INDUCTION GENERATOR
An output voltage wave having a desired amplitude and frequency is formed from selected portions of the AC signal generated by an induction generator. The selected portions of the generated signal...
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3792428 |
METHOD AND APPARATUS FOR CONTROLLING THE DOWNHOLE ACOUSTIC TRANSMITTER OF A LOGGING-WHILE-DRILLING SYSTEM
A logging-while-drilling system utilizes the flow of drilling fluid within a borehole as the transmission medium for telemetering downhole logging measurements to the earth's surface. The hydraulic...
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3786336 |
APPARATUS FOR MEASURING THE ANGULAR DISPLACEMENT AND THE ANGULAR VELOCITY OF A ROTATION MEMBER
Apparatus for measuring the angular displacement and the angular velocity of a rotating member. Mechanical energy causing angular motion of the rotating member is transformed into electrical energy...
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3781632 |
SERIES TYPE SOLID STATE VOLTAGE REGULATOR WHICH PROVIDES CONSTANT VOLTAGE TO A STORAGE DEVICE
A solid state voltage regulator electrically connected between a current source and a battery having a series SCR through which charging current is conducted whenever the battery voltage drops to a...
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3745442 |
VOLTAGE AND FREQUENCY RESPONSIVE REGULATING CIRCUIT FOR A PM GENERATOR
A solid state regulating circuit for a permanent magnet alternator which includes a switching element, preferably an SCR, for shunting the output winding of the alternator in response to a control...
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3714541 |
VOLTAGE CONTROL APPARATUS FOR AC GENERATORS
A saturable reactor is excited by the output of an AC generator, the field of which is controlled by a current exciting the reactor. Since the exciting current of the saturable reactor is...
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3675117 |
ASYNCHRONOUS GENERATOR DEVICE
The drive means of this invention comprises a squirrel cage induction motor adapted to operate as an asynchronous alternator without the use of an auxiliary synchronous machine. This relatively...
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3662251 |
METHOD AND SYSTEM FOR MEASURING ACCELERATION AND VELOCITY
The acceleration of the shaft of a synchronous alternator is measured accurately with low noise by computing the power going into acceleration, which is the input shaft power plus the excitation...
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3643130 |
SUPERVISORY DEVICE FOR RECTIFIER HAVING SEMICONDUCTOR VALVE-TYPE COMPONENTS
A thermal replica has an RC component having a variable resistance and a capacitor connected to the resistance. The variable resistance is dependent upon the operating frequency of a rectifier...
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3639820 |
CONVERTER ARRANGEMENT FOR FEEDING VARIABLE AC MOTOR
A regulable and controllable inverter or converter for feeding alternating current motors with a regulated current and frequency in which adjustment of the converter output voltage per phase is...
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3619763 |
FREQUENCY-RESPONSIVE CONTROL APPARATUS FOR ELECTRIC ALTERNATORS
In automatic regulating apparatus for an electric alternator a main thyristor is connected in series with an excitation winding across the alternator terminals and is controlled by a sensing...
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3619762 |
FREQUENCY RESPONSIVE ROTARY LINEAR AMPLIFIER FOR ALTERNATORS
Output signals from high-frequency alternators are stabilized by a quadrature mixing process. A plurality of modulating signals are applied to the fields of an alternator in such a fashion as to...
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3617856 |
ALTERNATOR UNDER-FREQUENCY DETECTING CIRCUIT
An alternator under-frequency detecting circuit for reducing the alternator output potential with conditions of less than normal output potential frequency. A source of each an alternating current...
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3609426 |
INERTIA-DRIVEN STANDBY ELECTRIC GENERATOR UNIT
A flywheel rotated above the mound speed of a generator is selectively coupled to the generator through a variable-speed clutch upon power failure to keep the generator speed constant during the...
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3571693 |
CONSTANT FREQUENCY OUTPUT TWO-STAGE INDUCTION MACHINE SYSTEMS
A system employing double-induction machines and being capable of providing constant-frequency electrical power from a variable speed drive or of operating as a controlled speed motor from a...
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3546533 |
FREQUENCY RELAY WITH RATE-OF-CHANGE OF FREQUENCY COMPENSATION
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3539906 |
EXCITATION OF A SYNCHRONOUS MACHINE IN ACCORDANCE WITH THE MAGNITUDE AND FREQUENCY OF THE STARTING ALTERNATING VOLTAGE
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3477013 |
HYDROSTATIC TRANSMISSION COUPLED STANDBY POWER SUPPLY
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3477015 |
VOLTAGE REGULATOR FOR MULTI-PHASE VARIABLE SPEED,VARIABLE FREQUENCY GENERATOR,PARTICULARLY FOR AUTOMOTIVE USE
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3476999 |
MOTOR POWER SUPPLY SYSTEM
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3471769 |
VOLTAGE REGULATORS FOR ELECTRIC GENERATORS
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3470456 |
GENERATOR CONTROL CIRCUIT HAVING MEANS FOR RAPID VOLTAGE BUILD-UP
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3467854 |
TRANSISTOR VOLTAGE REGULATOR INPUT CIRCUIT
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3467853 |
GENERATOR VOLTAGE REGULATING SYSTEM
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3465235 |
CONTROL OF ROTATING EXCITERS FOR POWER SYSTEM DAMPING
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3454864 |
ELECTRIC POWER GENERATOR FOR GENERATING POWER OF A PREDETERMINED FREQUENCY,MAGNITUDE,AND WAVE FORM
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3447065 |
VOLTAGE REGULATOR FOR A MULTIPHASE VARIABLE-SPEED,VARIABLE-FREQUENCY GENERATOR FOR AUTOMOTIVE USE
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3443112 |
ELECTRIC CRANKING MOTOR AUTOMATIC DISCONNECT CIRCUIT
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3436633 |
REGULATOR SENSING CIRCUIT FOR ALTERNATING-CURRENT GENERATOR
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3378757 |
Narrow frequency range, wide speed range, brushless a.c. generator
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3378756 |
Variable speed constant frequency generating system
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3378755 |
Alternator power supply system
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3375433 |
Device for controlling the output frequency of a generator driven by a wound rotor induction motor
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3371266 |
Field circuit control for alternating current generators
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3351844 |
Generator with constant frequency to voltage ratio output
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3349256 |
Frequency sensitive device
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3346801 |
Regulator with noise suppression
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