Matches 151 - 200 out of 505 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
5949247 Method and apparatus for automatically testing and evaluating electric generator sets  
A generator set testing system includes a generator set having generator set output signals indicative of generator set output characteristics, an automated load bank coupled to the generator set...
5917334 Method and apparatus for decoupling a high-frequency error signal from a high-frequency electromagnetic field in a heavy electrical machine  
A method for decoupling a high-frequency error signal from a high-frequency electromagnetic field in a heavy electrical machine includes decoupling a high-frequency error signal with at least one...
5907244 Method and apparatus for detecting winding errors in an electric motor stator  
A method and apparatus for detecting winding errors in electric motor stators having a plurality of field windings is disclosed. The method involves the steps of applying a current source to at...
5867029 Method of nondestructive insulation test and a nondestructive insulation testing apparatus  
A method of nondestructive insulation testing is disclosed which comprises the steps of: (a) placing an electric device, having a core and at least one winding provided on the core, in a reduced...
5864238 High speed dynamic run-out testing apparatus and method  
A high speed dynamic run-out testing apparatus includes a drive source rotatable at a high speed and having an output shaft, a main shaft coupled coaxially with the output shaft of the drive...
5828227 Abnormality detecting apparatus for electric equipment, particularly for a rotating electric machine  
An abnormality detecting method and apparatus for electrical equipment measures the frequency spectrum of a signal detected by a partial discharge sensor and detects a partial discharge signal...
5818236 Method and apparatus for checking insulation of ungrounded power source  
An apparatus includes an insulated first switching element and a capacitor which are connected in series between one of positive and negative main circuit wirings connected to an ungrounded power...
5814998 Device and method for locating partial discharges with detachable coupling units  
A device and a method for locating partial discharges in dynamoelectric high-voltage machines and/or high-voltage systems, comprising at least two coupling units (16, 17, 18) which are coupled to...
5789935 Motor evaluation data generating method with response delay compensation  
A method of evaluating a motor. Prior to testing the motor, the following factors are measured as essential properties of the motor, e.g. a correlation between a reference current and a motor...
5786708 Self-tuning and compensating turn fault detector  
A method for detecting turn faults in an induction motor includes obtaining motor current and voltage waveforms and converting the motor current and voltage waveforms to digitized current and...
5773991 Motor current sense circuit using H bridge circuits  
A circuit is used for sensing motor current. This circuit maximizes the power delivered to the motor whose current is being sensed. Further, this circuit results in maximum voltage drop across the...
5773972 Transition detection circuit for detecting transitions in the state of an object of detection  
A detector 1, with its object of detection having operation characteristics that include a shift from a first state to a second state, outputs a signal e1 that corresponds to the operation...
5767780 Detector for flow abnormalities in gaseous diffusion plant compressors  
A detector detects a flow abnormality in a plant compressor which outputs a motor current signal. The detector includes a demodulator/lowpass filter demodulating and filtering the motor current...
5761958 Dynamometer fault detection system  
In one embodiment of the present invention, a fault detection system for a dynamometer includes circuitry for measuring the armature voltage of the dynamometer. The voltage can used as an indicator...
5754450 Detection of faults in the working of electric motor driven equipment  
Apparatus for monitoring the functioning of motor driven equipment, including current sensing apparatus connectable to the power input of the motor and producing a current signal; signal correction...
5740600 Electric motor stator winding bonding apparatus and method therefore  
Apparatus (10) and method for bonding together coils of an electrical wire forming windings (W) of a stator assembly (54) employed in making an electric motor. The apparatus includes a fixture (22)...
5742522 Adaptive, on line, statistical method and apparatus for detection of broken bars in motors by passive motor current monitoring and digital torque estimation  
During a learning stage a motor current signal is monitored, and estimated motor torque is used to transform the current signal into a time-frequency spectra including a plurality of segments...
5739693 Method for detecting ground faults on the conductors of an electrical machine  
A method is specified for detecting ground faults on the conductors of an electrical machine, in which method the conductors of the machine are biased with respect to ground by means of an...
5739698 Machine fault detection using slot pass frequency flux measurements  
A method for nonintrusive detection of anomalies in electric machines. A flux coil is positioned external to the motor to obtain magnetic leakage flux measurements, which are transformed to the...
5714889 Method and device for indicating the direction of rotation of a three-phase system  
A method and measuring device are provided for measuring the direction of rotation of a three-phase system. The measurement is carried out by measuring sensors. A coupling circuit is connected to...
5701089 Alternator/starter testing device  
An improved alternator/starter testing device includes an electronic voltage regulator for regulating the output of an externally regulated alternator. A selectable load switch allows so-called...
5694044 Simultaneous surge test of two coils of an assembly of series connected coils  
A circuit detects insulation defects in a coil assembly including a plurality of series connected coils. A first voltage pulse is applied to a first coil of the coil assembly, a second voltage...
5691643 Ground fault detecting apparatus and method for detecting ground fault of field circuit and exciting circuit by detecting ground fault current flowing from ground to neutral point of exciting circuit  
An apparatus detects a ground fault of an exciting circuit and a field circuit of an AC exciting variable speed rotating machine. The exciting circuit outputs an excited voltage controlled a...
5689194 Acoustic motor current signature analysis system with audio amplified speaker output  
An apparatus for monitoring and processing of motor currents to determine motor characteristics under various loads. In the preferred embodiment, the invention employs a spectrum analyzer that...
5684718 Method and apparatus for monitoring the operation of an electric generator  
A method and apparatus are provided for monitoring the operating conditions of an electric generator by producing a signal representative of vibration amplitude in end turns of stator windings of...
5682102 Electrostatic capacity measuring instrument for stator winding of electric rotating machine  
An electric rotating machine comprises a rotor body of cylindrical structure and a stator body covering an outer peripheral portion of the rotor body in a non-contact fashion. The stator body...
5680059 Abnormality detecting method and apparatus for electric equipment, particularly for a rotating electric machine  
The abnormality detecting method and apparatus for electric equipment measure the frequency spectrum of a signal detected by a partial discharge sensor 9, and detect a partial discharge signal...
5675247 Dual head armature processing method and apparatus  
A method and apparatus provides two testing stations at a single conveyor location to permits one part, such as electric motor armatures, to be tested while another part is being loaded or unloaded...
5675497 Method for monitoring an electric motor and detecting a departure from normal operation  
A method for detecting a departure from normal operation of an electric motor comprises the steps of modelling a set of normal current measurements and a set of operational current measurements for...
5666066 Overcurrent detecting device for a DC motor  
An overcurrent-detecting device for a DC motor includes a converter for changing a current signal to a voltage signal in a motor; an integrator for comparing an input signal from the convertor with...
5661410 Method and apparatus for the detection of the current distribution in a conductor of an electric machine  
A method and an apparatus for the detection of the current distribution in at least one conductor (W1, W2) of an electric machine are specified, which indirectly permit, in a simple manner, the...
5652525 System and method for detecting D.C. motor circuit failures  
Apparatus and method are provided for determining and indicating if certain types of circuit failures have occurred in a D.C. motor circuit such as a locked rotor condition, a short-circuit or an...
5652526 Electric motor analyzer  
An analyzer for performing high and low voltage tests on an electric induction machine having electric power input terminals. The analyzer comprises: (a) a high voltage testing circuit for...
5644242 Armature winding and winding connection test methods  
A single source of energy is used to determine up to four armature coil or winding resistances and effectively up to four armature winding weld resistances for each test connection or index...
5640103 Radial basis function neural network autoassociator and method for induction motor monitoring  
A method for detecting a departure from normal operation of an electric motor comprises obtaining a set of normal current measurements for a motor being monitored; forming clusters of the normal...
5614817 Method and device for determining the real power of a DC electrical drive  
A method for determining the real power of an electrical drive, preferably an electrical fitting drive, includes subtracting an ohmic or resistive power loss in a stator of the drive from a...
5612629 System and method for detecting fault conditions in a direct current motor  
Apparatus and method are provided for determining indicating if certain types of circuit failures have occurred in a D.C. motor circuit such as a locked rotor condition, a short-circuit or an open...
5594350 Signal detecting circuit for digital controller  
An instantaneous value of alternating current signal from an instrument potential transformer 10 or an instrument current transformer 9 is processed with an analog filter 21, 22, the frequency to...
5578937 Instrument for analysis of electric motors based on slip-poles component  
A new instrument for monitoring the condition and speed of an operating electric motor from a remote location. The slip-poles component is derived from a motor current signal. The magnitude of the...
5578928 Method for detecting zero crossings in a rectified power signal  
A method for detecting or sensing zero crossings in a rectified power signal comprising three separate signal constituents for energizing a three-phase circuit is provided. The method includes the...
5576632 Neural network auto-associator and method for induction motor monitoring  
A method for detecting a departure from normal operation of an electric motor comprises obtaining a set of normal current measurements for a motor being monitored; training a neural network...
5569966 Electric vehicle propulsion system power bridge with built-in test  
A power bridge for an electric vehicle propulsion system, comprising a switching circuit including first and second switching elements operable between "on" and "off" states and a midpoint detector...
5568059 Current sensor and motor rotation sensor using such current sensor  
The present invention relates to a current sensor for detecting current flowing in a current line, and a motor rotation sensor which utilizes this current sensor. A first transformer is inserted in...
5568058 Automatic motor tester  
An automatic motor tester runs performance and quality control checks on newly assembled motors. The motor tester includes a vertical support, contacts contained within a housing which is mounted...
5550477 Methods and apparatus for testing armature coils and coil lead connections using resistance measurements  
An improved armature testing apparatus and method are provided. The individual resistances of two commutator bar lead connections can be simultaneously measured in a single measurement step....
5550485 Multifunction alternator testing device  
An alternator testing device has a frame to which is secured an adjustable bracket for mounting an alternator. A housing, which is also secured to the frame includes a control panel and a testing...
5546015 Determining device and a method for determining a failure in a motor compressor system  
A determining device for determining a failure in a motor compressor system, comprising a current detecting sensor for detecting a current input to a motor for driving a compressor, a mass flow...
5546014 Method and device for setting the short circuit moment in electric motors, particularly in servomotors  
A method and a device are proposed for setting the short circuit moment in electric motors, particularly in servomotors. For this purpose, the actual short circuit moment of the electric motor is...
5537030 Voltage regulator test set for the power distribution industry  
A portable test set for testing the voltage regulators used by utilities in the power distribution industry for regulating a voltage level of electrical power supplied over a transmission line...
5528164 Modification to a Y-scan monitor circuit  
A supplemental monitoring device which issues an error signal when the monitoring device loses motor drive pulses is disclosed. Also disclosed is providing a manufacturing system with a normally...
Matches 151 - 200 out of 505 < 1 2 3 4 5 6 7 8 9 10 11 >