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5144232 |
Testing device for an electric generator
An RPM and voltage indicator is used to check the operating speed and voltage output of a generator set. The device is used to verify the proper operation of a generator set or any auxiliary power...
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5134378 |
System and method for detecting faults in generator bearing pedestals and seal insulation
Both a system and method is provided for detecting faults in the insulating interface disposed between the shaft of a generator, and the bearings and seals that rotatably support it that generally...
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5126658 |
Generator rotor winding ground detection
A device for detecting a ground fault in a winding mounted to rotate with the rotor of a machine, in which an electric potential is present across the winding during machine operation, the rotor is...
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5126678 |
A.C. Generator fault detector
Faults in the operation of a multi-phase A.C. generator are detected by monitoring the phase difference between two line-to-line voltage of the generator and comparing this phase difference with a...
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5107209 |
Power supply testing system for non-utility power generators
A power supply testing system for a non-utility power generator, etc. a plurality of tank units to be powered, which are provided depending upon the number of phases of a multi-phase AC power...
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5107218 |
Method of operation of air cleaner used in motor vehicle
Method of operation of an air cleaner used in a motor vehicle, comprises the steps of: intermittently turning off a blower motor of the air cleaner at a given interval; detecting ripple components...
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5087909 |
Method and apparatus for radio frequency signal detection
A method and apparatus which indicates an actual arc occurrence only if a voltage or current of a generator neutral lead exceeds a specified threshold amplitude, and is followed by a second RF...
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5055775 |
Transmission device
An apparatus for tranmitting signals that can be broken down into at least one AC voltage component between a rotor and a stator from a sender unit to a receiver unit, with the help of annular...
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5051682 |
System for detecting load on generator
A peak hold circuit and a sample-and-hold circuit are provided for accurately and immediately detecting variations in a load connected to a generator. The peak hold circuit holds a peak voltage of...
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5049815 |
Spectral analysis of induction motor current to detect rotor faults with reduced false alarms
Pursuant to detecting rotor faults in an induction motor by analysis of a frequency spectrum of the current drawn by the motor under test, wherein success of the fault analysis requires an accurate...
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5030917 |
Transient rotor fault detection in induction and synchronous motors
To detect broken bars in the rotor of induction and synchronous motors, the current drawn by the motor during the transient startup period as the motor runs up to steady state speed is analyzed to...
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5019760 |
Thermal life indicator
A method for continuously determining the consumed insulation life of an electrical winding in a rotating machine is described incorporating the steps of selecting constants based on the class of...
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5003252 |
Apparatus and method for measuring power factor and torque on the output of variable frequency drives
An apparatus and method for sensing power factor and torque on the output of a variable frequency machine is disclosed. Initially, power is sensed in each phase of the three-phase machine by...
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4996477 |
Apparatus and method for testing electrically controlled motor
An on-site test unit is for an electric motor having an electronic timer having motor control contacts and a parallel capacitor completing a power connection with the opposite power connection...
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4978909 |
Demodulation circuit for AC motor current spectral analysis
A motor current analysis method for the remote, noninvasive inspection of electric motor-operated systems. Synchronous amplitude demodulation and phase demodulation circuits are used singly and in...
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4973902 |
Fault detector for aircraft variable speed, constant frequency power supply
A variable speed, constant frequency aircraft power system uses current sensing diodes to rectify the power generator output. The current flow through pairs of diodes is compared to generate phase...
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4967123 |
Gyro control and monitor circuit
An energizing and test circuit for a gyroscope spin motor which in addition o having a set of energizing coils, also includes a reference coil which generates a sinusoidal voltage whose frequency...
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4965513 |
Motor current signature analysis method for diagnosing motor operated devices
A motor current noise signature analysis method and apparatus for remotely monitoring the operating characteristics of an electric motor-operated device such as a motor-operated valve. Frequency...
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4961157 |
Method and apparatus for electrostatic discharge testing of machines which repetitively execute a stored program with a plurality of program steps
The present invention employs random electrostatic discharges to stress test electrical machinery, particularly digital computer systems running repetitive diagnostic programs. There is provided an...
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4940933 |
Fiber optic arc monitor
Apparatus 50 for the detection and location of arcing within an enclosed electrical device, such as an electric generator 20. Fiber optic cables 53 are strategically mounted within the generator 20...
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4922172 |
Motor test apparatus, system and method
An electric motor is tested by sensing the phase of an alternating current waveform to be applied to the motor, and applying the waveform to the motor in response to the phase of the waveform...
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4922195 |
Extraneous frequency detector
An extraneous frequency detector especially suited for analyzing the three-phase output of a variable speed constant frequency (VSCF) generator generates in a sample-and-hold circuit amplitude...
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4914386 |
Method and apparatus for providing thermal protection for large motors based on accurate calculations of slip dependent rotor resistance
A microprocessorized thermal protection system and accompanying method measures input voltage and current of an induction motor and derives therefrom continuously updated estimates of the slip...
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4910457 |
Water resistance load system
The water resistance load system which comprises a water resistor, which includes a cylindrical base electrode with a bottom for storing a predetermined quantity of water while water is circulated...
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4890058 |
Arrangement for measuring the slip of electric induction motors
An arrangement for measuring the slip of electric induction motors determines the relative measure of the difference between rotary field speed and rotor speed of induction motors by utilizing the...
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4888996 |
DC motor operated valve remote monitoring system
A method and apparatus for remotely monitoring the condition of a DC motor operated valve and/or valve operator by monitoring at a remote location, such as the Motor Control Center ("MCC"), the...
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4884023 |
Method and apparatus for determining the rotor resistance of a rotating-field machine
In order to determine the rotor resistance of a rotating field machine, a current is impressed in the stator via a field-oriented control, which current has a harmonic component above the nominal...
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4878006 |
Multi-voltage motor and timer clock
A motor having a capacitor in series with its coil permits the motor to operate at a higher voltage or range of voltages over its design voltage. A method determines the correct value of a...
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4864242 |
Automatic field winding ground detector and locator
A system for detecting and locating a ground fault (34) in the field winding (2) of a machine, in which a DC potential is present across the winding (2) during machine operation and the winding (2)...
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4860231 |
Calibration technique for variable speed motors
A variable speed motor is regulated responsive to the load torque acting on the blower wheel. The load torque acting on the blower wheel is determined by means of a coast down procedure in which...
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4851766 |
Fault diagnosis system for rotor winding of rotary electric machine
A fault diagnosis system for a rotor winding of rotary electric machines is disclosed, in which the rotor winding of rotary field type is excited in DC fashion by an excitation circuit, on which an...
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4849690 |
Detection of transposition group short circuits in machine windings
A method for nondestructively electronically detecting a short circuit in a conductor system which is composed of two parallel inductor groups connected together to form a selected current path...
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4839585 |
Magnetic field sensor coil for being fitted around a motor shaft
A magnetic field sensor coil wherein the coil is formed into a shape comprising two generally C-shaped limbs (2, 3) one within the other, one of these limbs being covered by a magnetic screening...
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4829234 |
Method and apparatus for measuring the resistance of the winding of a converter-fed single- or three phase machine during operation
A method and apparatus for measuring the resistance of a winding of a converter-fed single- or three-phase machine during operation by means of a d-c measuring current. The firing instant of at...
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4817045 |
Monitored control arrangement
In an apparatus whose output power is monitored and controlled to avoid safety-endangering effects, such as medical equipment, a monitored control arrangement is provided which includes (1) a...
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4814699 |
Method for partial discharge detection and breaking spark measuring in dynamo-electric high-voltage machines, and an apparatus for performing the method
A method for partial discharge detection and breaking spark measurement in a dynamo-electric high-voltage machine, especially for monitoring insulation status during operation of a stator winding...
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4813115 |
Method for testing and repairing synchronous motors
An apparatus for testing a synchronizing control circuit for any assembly relying upon detecting the relative closeness of one voltage of varying frequency to another voltage of different varying...
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4814700 |
Field current measurement device
A rotating machine including a generator having a rotor provided with a field winding, an exciter having an armature, a rotatable steel shaft connected to the generator rotor and the exciter...
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4810955 |
Measuring apparatus for determining the countervoltage of electric motors
For controlling d-c motors which are supplied with an armature current obtained by phase gating, the bucking voltage induced in the motor is particularly well suited. This voltage is calculated...
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4808932 |
Rotor fault and location detector for induction motors
A method and apparatus for detecting rotor faults in an induction motor. Such induction motors have a stator and a rotor comprising a multiplicity of rotor bars. The flux around the rotor bars is...
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4804910 |
Traction load meter system
A traction load meter system for displaying information concerning the amount of current energizing electric motors which drive a locomotive. These motors have power and braking modes and have a...
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4800334 |
Method of analyzing the voltage induced in an exciter coil of a stepping motor
A method of analyzing the voltage induced in an exciter coil of a stepping motor. After energization the exciter coil is loaded by a low impedance so that the induction voltage can produce a...
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4789834 |
Method and apparatus for testing of induction motor overload protection device
A method and apparatus for testing the operability of an overload protection device for an induction motor, rapidly and without the need to mechanically load the motor output shaft. A rectifier...
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4788497 |
Apparatus for measuring motor rotation position and speed
An apparatus for detecting the speed and position of a rotating shaft of an electrical motor. A commutator is provided having three or more poles. First and second brushes are provided in sliding...
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4786866 |
Method and apparatus for power steering
The operating condition of a power steering device for use in a motor car of the type including a steering mechanism driven by a electric actuator is confirmed by supplying test current to the...
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4779051 |
Coupling unit for the operative monitoring of the high-voltage wingings and the connected output leads in electric high-voltage machines and apparatus, by means of partial discharge determination and breakdown spark measurement
Coupling unit for the operational monitoring of the high-voltage winding (SW) and the connected electric output lines in electric high-voltage machines and apparatus, particularly of three-phase...
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4777446 |
Machine for the automatic testing of electric motor rotors
A machine for the automatic testing of electric motor rotors comprises a system for checking various characteristics of rotors arriving from a line of production thereof, in which system there are...
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4775828 |
Power level indicator for an electric generator
A power level indicator is described for use with an electric generator for indicating to the operator the percentage of the total power available from the generator which is being consumed by a load.
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4766387 |
Motor winding insulation resistance monitoring system
A motor winding insulation resistance monitoring system for measuring the insulation resistance of a winding of a polyphase motor while the motor is operating including a motor winding insulation...
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4763058 |
Method and apparatus for determining the flux angle of rotating field machine or for position-oriented operation of the machine
For establishing the field direction without mechanical pickup upon startup of a rotating field machine, e.g., in permanent excitation, a high-frequency component (iz*) is impressed on the stator...
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