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7616023 |
Method of detecting a malfunction of an encoder for a vehicle drive system
A method of detecting a malfunction of an encoder used in a vehicle drive system includes determining an error of a motor speed based on an estimated motor speed, wherein the estimated motor speed...
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7612576 |
Method for detecting an inverter hardware failure in an electric power train
In a method for detecting an inverter hardware failure in an electric power train comprising high voltage cables, at least one electric machine and at least two inverter legs with two power...
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7592772 |
Stator inter-turn fault detection of synchronous machines
A fault detection system using field current and rotor search coil voltage harmonics is provided. The technology is capable of detecting an inter-turn fault unambiguously and rapidly in a...
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7570074 |
Electronic overload relay for mains-fed induction motors
An induction motor having a rotor and a stator is protected during running overloads by connecting the motor to an overload protection relay that can be tripped to interrupt power to the motor in...
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7570004 |
System and method for detecting a motor shorting relay failure
Methods and systems for detecting a motor shorting relay failure. Exemplary embodiments include methods and systems for determining a motor shorting relay failure in a motor, the motor having first...
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7545163 |
Three phase motor diagnostics and phase voltage feedback utilizing a single A/D input
A motor system utilizes a single feedback output to determine various fault states for a 3-phase motor in a non-operational condition. The same single feedback output may be used to determine the...
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7539549 |
Motorized system integrated control and diagnostics using vibration, pressure, temperature, speed, and/or current analysis
Systems and methods are disclosed for controlling and diagnosing the health of a motorized system. The systems may comprise a diagnostics system and a controller, wherein the diagnostics system...
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7538571 |
Starter zero current test apparatus and method
An alternator and starter tester system having a starter current zero test. The current is measured before and after a solenoid of a starter motor is energized and deenergized to determine if the...
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7535372 |
Method for measuring the operating state of a synchronous motor using composite power angle meter
The present invention discloses a method for measuring the operating state of synchronous motor by using composite power angle meter, the method comprising steps of: a) obtaining various signals of...
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7528611 |
Methods and system for detecting winding faults in a generator with parallel windings
A method for detecting stator ground faults in a generator is described. The method includes receiving a neutral voltage signal from a neutral point of a stator, receiving a plurality of terminal...
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7499815 |
Machine radial stack gap generation and clearance management system and method
A system and method for readily generating radial clearance data for a radial clearance between locations on at least two parts in a rotating machine includes rendering an image of a cross section...
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7489483 |
System and method for look ahead detection of electrical problems at a motor of a vehicle
A system for sensing short circuits and open circuits prior to operation of a motor (i.e., while the motor is in a static state), thereby sparing the electrical system from destructive effects of...
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7462999 |
Brushless servo motor tester
A permanent magnet brushless (PMBL) servo motor test apparatus and method allow testing of a motor in place. A set of static and dynamic tests is performed to determine proper motor operation of...
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7414425 |
Damping control in a three-phase motor with a single current sensor
While a PWM-controlled, FET-switched three-phase motor is operating in a mechanical damping mode, a single current sensor is used to measure current in the motor. When mechanical feedback into the...
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7411404 |
Apparatus, system, and method for detecting an electrical short condition in a dynamoelectric machine
A system, apparatus, and method ( 10 ) for detecting an electrical short condition in a dynamoelectric machine are described. The method includes determining an operating parameter of a...
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7382150 |
Sensitivity switchable detection circuit and method
A sensitivity switchable detection circuit includes a high gain circuit for outputting a first signal, a low gain circuit for outputting a second signal, and an output switching circuit for...
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7382138 |
System and method for non-destructive testing of rotors
A method is provided for testing an electrical characteristic of a rotor. In one embodiment, the method may include applying current to the rotor, measuring voltage drop between first and second...
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7355436 |
Method for error detection in a drive mechanism
A method for error detection in a drive mechanism, having a multiphase electric motor and a converter connected upstream thereof, wherein the converter controls voltages of individual phases of the...
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7339394 |
Current sensing in a two-phase motor
A method and apparatus for measuring current by a single sensor for two motor phases driven by first and second set of switches to drive respective first and second phases of a motor under control...
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7310002 |
Motor inspection method
A method of measuring the counter-electromotive force of the motor accurately is disclosed. The counter-electromotive force of the motor changes with the rotational position and the rotational...
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7288956 |
Device and method for detecting rotor speed of a multiple phase motor with bipolar drive
A method for detecting rotation of a rotor of a multiple phase motor with bipolar drive is described, excluding a three-phase motor with bipolar drive with star connected coils or motor stator...
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7275003 |
Harmonic diagnosing method for electric facility
The present invention relates to a method of diagnosing deterioration by comparing an index value which is obtained by dividing the relative harmonic content of each order of the current harmonics...
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7259583 |
Methods and apparatus for testing power generators
A method for testing a generator including a plurality of phase groups is provided. The method includes electrically isolating a first phase group from remaining phase groups by substantially...
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7253634 |
Generator protection methods and systems self-tuning to a plurality of characteristics of a machine
A method for detecting stator ground faults in a generator is described. The method includes receiving a neutral voltage signal from a neutral point of a stator, receiving a plurality of terminal...
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7245130 |
Method and apparatus for diagnosing motor damping network integrity
An apparatus for diagnosing motor damping network integrity, the motor damping network configured for selective short-circuiting of the windings of a motor in a motor control system. The apparatus...
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7239149 |
Search coil mount for facilitating inspection of a generator rotor in situ
A mount is for installing a probe, such as for example, a search coil, in a variety of locations and orientations within an electrical generator, without requiring the rotor of the generator to be...
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7224177 |
Apparatus and method for determining whether motor lock error occurs in sensorless motor
An apparatus and method for determining the presence or absence in a motor lock error in a sensorless motor. The method includes the steps of: driving the sensorless motor; determining whether or...
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7212010 |
Method and device for detecting a contact point on a shaft of a rotating machine
A method and a device for detecting a touching point (i.e. contact point) on a machine having a rotating shaft, in which the touching point (i.e. contact point) on the shaft is determined during...
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7208971 |
Manual probe carriage system and method of using the same
A probe support carriage for use during probing an electrical device includes a body, means for supporting and positioning the body, a plurality of flux sensors and a position sensor. The body has...
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7206719 |
Diagnostic method for predicting maintenance requirements in rotating equipment
This invention is a method to determine the condition of rotating equipment, namely drive spindles, to enable the timely maintenance or replacement of same. The method uses an electrical signal...
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7205756 |
Unbalanced current detection
An unbalanced current detection circuit determines when a multi-phase, normally-balanced load is unbalanced. The detection circuit of the present invention includes a plurality of current-squaring...
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7187180 |
Method of sensing motor winding current in integrated stepper motor buffer
A method and motor controller for sensing motor winding current. An FET drive transistor has its ON resistance periodically increased to about five times the normal ON resistance for short sensing...
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7176674 |
Measurement of energy by means of a frequency converter
A method and system for the measurement of energy in an alternating-current motor drive containing a frequency converter or an equivalent stepless rotational speed regulator provided with...
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7174270 |
Rotation angle detecting apparatus and method of detecting rotation angle
A rotation angle detecting apparatus having a reference signal-generating device that generated a reference signal; a rotation angle detecting section that generated an output signal in response to...
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7164243 |
System and method for establishing motor efficiency during balanced or unbalanced operating conditions
A system and method for establishing a plurality of operating parameters of a multiphase motor. The plurality of electrical parameters may be established from stator resistance data and electrical...
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7161375 |
Phase-loss detection for rotating field machine
A method for detecting a loss of a phase in a multiphase rotating field machine, the method comprising providing a first electrical current into the machine windings to cause the current vector to...
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7126368 |
System and method for detecting motor coil-to-coil faults
A system and method detects coil-to-coil faults in an electric motor having a plurality of coils. The method includes applying a square wave signal to a first coil of the motor, connecting a...
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7122982 |
DC motor rotation information detecting device
A rotation information detection device detects rotation information of a DC motor based on a surge component waveform superimposed on a voltage waveform between the terminals of the DC motor or a...
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7109742 |
Current sensing in a two-phase motor
A method and apparatus for measuring current by a single sensor for two motor phases driven by first and second set of switches to drive respective first and second phases of a motor under control...
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7102379 |
Apparatus and method for monitoring and/or analysis of electrical machines during operation
An apparatus and a method for monitoring and/or analysis of electrical machines during operation, wherein the electrical machine has at least one generator with a shaft and drive means for driving...
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7098683 |
Motor driving system having power semiconductor module life detection function
In the motor driving system, a unit to predict the separation of the wire is built into the power semiconductor module thereby to predict that the time of separation of the wire is approaching...
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7095244 |
System and method for determining operational states of first and second electrical contacts in a motor
A system and a method for determining operational states of first and second electrical contacts in a motor are provided. The motor has first, second, and third phase windings. The first phase...
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7095243 |
AC generator exciter rotor slip-ring test apparatus
A test apparatus assembly is provided for testing an AC generator having an exciter rotor mounted to a shaft. The apparatus includes an annular end bell, a carbon brush assembly coupled to the end...
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7091724 |
Model-based fault detection in a motor drive
A method for detecting an open winding in a motor. The method employs passive monitoring of the voltage, current and speed of the motor. A residue voltage is calculated that equals the difference...
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7083544 |
Method and apparatus for monitoring a transmission part
A control device for electric motors and a method for monitoring the serviceability of a transmission part arranged for transmission of torque between an electric motor and a load during operation....
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7081760 |
Method of diagnosing a broken bar fault in an induction motor
A method for diagnosing induction motor broken bar faults using the resultant magnetic field pendulous oscillation phenomenon is disclosed. Broken bar faults cause the resultant magnetic field of...
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7078925 |
Method and apparatus for detecting and correcting wiring errors in power monitoring applications
A three-phase monitoring system for detecting and dynamically correcting wiring errors in an electrical circuit. The system includes a voltage divider circuit and a current transformer circuit...
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7068062 |
Fault detection apparatus of direct-current motor drive bridge circuit
In a direct current motor drive bridge circuit structured such that a pair of forward rotation switching elements and a pair of reverse rotation switching elements are alternately connected...
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7047145 |
Compensation method of resolver detected position
A resolver detected position compensation system for a resolver is provided that can enhance a position detection precision by performing a further compensation on a compensated position that was...
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7046032 |
Electrical connection plug for remote monitoring of high voltage motors
The present invention provides a motor signature measuring system comprising three current transformers which are placed around the power cables leading to the high voltage motor, an E-Plug module...
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