Class / Patent application number | Description | Number of patent applications / Date published |
324765010 | Motor or generator fault | 74 |
20100277199 | System For Diagnosing Defects in Electric Motors - The invention relates to a device for the diagnosis of flanges in tri-phase motors. More specifically, the invention relates to a device comprising means for the inductive acquisition of currents in a common mode for the simple and practical diagnosis of the defects in the flanges of a tri-phase motor. The invention also relates to a current-measuring device comprising means for capturing currents by inductive methods. The invention further relates to a device and a method for detecting defects in alternating-current electric motors, and more specifically, to a device and a method for obtaining parameters relating to the possible defects in an electric motor, in order to carry out a reliable diagnosis of the defects during the normal operation of the motor. | 11-04-2010 |
20100283500 | METHOD OF ERROR DETECTION WHEN CONTROLLING A ROTATING FIELD MOTOR - A method is specified for fault identification when operating a rotating-field motor by means of a pulse-controlled inverter, wherein electromagnetic state variables of the rotating-field motor are determined by means of a mathematical model in space-vector form, and wherein the pulse-controlled inverter is operated electronically using space-vector variables. In this case, the invention provides that, during the operation of the rotating-field motor, the space vector of an uncontrolled state variable of the rotating-field motor is formed, in that the space vector that is formed is analyzed for a spectral component at twice the frequency of the rotating field, and in that, if the spectral component at twice the frequency is present, a partial turns short is deduced in the stator windings. | 11-11-2010 |
20110006802 | HIGH SENSITIVITY DIFFERENTIAL CURRENT TRANSFORMER FOR INSULATION HEALTH MONITORING - A current transformer is provided. The current transformer comprises a magnetic core having a central opening, at least one pair of conductors extending through the central opening and positioned symmetrically with respect to a center point of the magnetic core, one or more coils disposed on the magnetic core along a magnetic neutral axis of the magnetic core and one or more coils disposed on the magnetic core along a reference axis, wherein the reference axis is substantially perpendicular to the magnetic neutral axis. | 01-13-2011 |
20110012637 | METHOD FOR DETECTION OF INTERLAMINAR SHEET SHORT CIRCUITS IN THE STATOR SHEET CORE OF ELECTROMACHINES - A method and an apparatus are described for detection of interlaminar laminate shorts in the laminated stator core of electrical machines, in which the laminated stator core ( | 01-20-2011 |
20110025369 | METHOD AND SYSTEM FOR TESTING ELECTRIC AUTOMOTIVE DRIVE SYSTEMS - Various methods and systems for testing electric automotive drive systems are provided. The methods may be implemented with components with components that are used during normal operation of the automobile, such an inverter, an electric motor, and an electronic control system. One such method includes adjusting the frequency of a current pulsed input provided to an electric motor while monitoring the winding currents. Another method includes monitoring current flow during and after a direct current (DC) pulse is generated by switches within an inverter. A further method includes monitoring current flow while a deactivation signal is provided to the switches and during individual activation of the switches. | 02-03-2011 |
20110025370 | Method and System for Testing Yawing System for Wind Turbine - A system and method is provided for ground testing of a yaw system of a nacelle ( | 02-03-2011 |
20110025371 | METHOD FOR DETECTING A FAULT IN AN INDUCTION MACHINE - The invention concerns a method for detecting a fault in a rotating field machine, in which current components are analysed in a flux-based, particularly rotor-flux-based, coordinate system a flux-forming current component being subjected to a frequency analysis in the flux-based, particularly rotor-flux-based, coordinate system. It is endeavoured to provide a simple method for an early detection of faults. For this purpose, a current operating point is detected for at least one predetermined supply frequency (f | 02-03-2011 |
20110037495 | METHOD FOR FAULT DETECTION IN CONTROLLING A ROTARY FIELD MOTOR - The invention specifies a method for fault identification when driving a polyphase motor by means of a frequency converter, wherein, in a rest state, the frequency converter controls the phase voltages of the polyphase motor and the phase currents of the polyphase motor are measured. In this case, provision is made for, then in the rest state, the phase currents or current variables derived therefrom to be adjusted by closed-loop control to a predetermined setpoint current variable, for the frequency converter to be controlled so as to output an interference voltage variable for the phase voltages, for the response of the adjustment by closed-loop control to the interference voltage variable to be observed, and for a conclusion to be drawn regarding a fault of the frequency converter and/or the phases of the polyphase motor from the response of the closed-loop control. The cited method allows for largely loss-free detection of faults in the drive system of a polyphase motor. In the event of field-oriented closed-loop control, no additional complexity is required in the measuring device. | 02-17-2011 |
20110050277 | SYSTEM FOR CONTROLLING AT LEAST ONE ACTUATOR OF THE COWLINGS OF A TURBOJET ENGINE THRUST REVERSER - The control system of the invention includes at least one actuator ( | 03-03-2011 |
20110102012 | PARAMETER ESTIMATION SYSTEM AND METHOD FOR AN INDUCTION MOTOR - A method of estimating stator resistance of an induction motor is provided. The method includes applying voltage pulses through two phase paths of the motor for a plurality of electrical cycles to inject current in the motor, wherein the voltage pulses are applied until rotor flux of the motor is substantially stabilized and measuring stator voltage and stator current in response to the applied voltage pulses for each of the plurality of electrical cycles. The method also includes calculating the stator resistance based upon the measured stator voltages and the stator currents. | 05-05-2011 |
20110175641 | INSPECTION VEHICLE FOR INSPECTING AN AIR GAP BETWEEN THE ROTOR AND THE STATOR OF A GENERATOR - An inspection vehicle ( | 07-21-2011 |
20110241723 | METHOD FOR MONITORING A CONTROLLER OF A THREE-PHASE ELECTRIC MOTOR AND/OR THE ELECTRIC MOTOR - A method for monitoring a controller for controlling and/or monitoring a three-phase electric motor, in particular an asynchronous or synchronous motor, wherein two phase currents are measured and an error signal is generated if at least one of the two measured phase currents is essentially zero. An error signal is also generated if none of the two measured phase currents is essentially zero, but a sum formed of the two measured phase currents is essentially zero. | 10-06-2011 |
20110260748 | APPARATUS AND METHOD FOR DIAGNOSING PERMANENT MAGNET DEMAGNETIZATION OF PERMANENT MAGNET SYNCHRONOUS MOTOR, AND APPARATUS FOR DRIVING PERMANENT MAGNET SYNCHRONOUS MOTOR - Provided are an apparatus and a method for diagnosing permanent magnet demagnetization of a permanent magnet synchronous motor. The apparatus includes a magnetic field generating unit, a stator current measuring unit, and a demagnetization diagnosing unit. The magnetic field generating unit generates magnetic fields of which directions are respectively parallel to a predetermined direction among a plurality of directions passing through a rotation axis of a rotor, on a plane vertical to the rotation axis of the rotor which is in a standstill. The stator current measuring unit measures currents which flow in a stator winding in correspondence with the respective generated magnetic fields. The demagnetization diagnosing unit compares a predetermined reference value and a comparison value which is calculated on the basis of the magnitudes of the stator winding currents which are measured in correspondence with the respective generated magnetic fields to diagnose demagnetization of a permanent magnet attached to the rotor. | 10-27-2011 |
20110304351 | METHOD AND APPARATUS FOR OFF-LINE TESTING OF MULTI-PHASE ATERNATING CURRENT MACHINES - A method and apparatus are provided for off-line testing of a multi-phase alternating current machine. The method comprises determining, at a first rotor position, a physical stator quantity of each stator winding by applying a test signal to each stator winding, and determining a first joint physical stator quantity by summing the determined physical stator quantities of the stator windings. There is also provided a method and apparatus for off-line testing of a multi-phase alternating current machine. The method comprises determining, at a second rotor position, a physical stator quantity of each stator winding by applying a test signal to each stator winding, determining a second joint physical stator quantity by summing the determined physical stator quantities of the stator windings, comparing the second joint physical stator quantity with a previously determined first joint physical stator quantity, and determining a fault condition of said multi-phase alternating current machine if the first joint physical stator quantity differs from the second joint physical stator quantity | 12-15-2011 |
20120001652 | ELECTROMAGNETIC ACTUATOR INSPECTION DEVICE AND IMAGE FORMING APPARATUS - An electromagnetic actuator inspection device, including a driver to PWM control an electric power input to a drive coil of an electromagnetic actuator to PWM drive the electromagnetic actuator; a PWM drive controller to output a PWM signal to the driver; a voltage detector to detect a voltage generated in the drive coil of the electromagnetic actuator when pausing its PWM drive; and a determiner to determine at least one of whether the electromagnetic actuator is connected to the driver and whether the drive coil is disconnected, based on the voltage detected by the voltage detector. | 01-05-2012 |
20120019281 | System, apparatuses, methods, and computer program products for electric motor testing and analysis - Systems, apparatuses, methods, and computer program products (i.e., software) for electric motor testing and analysis. Electric motor winding resistance and motor temperature are measured. The resistance measurement is normalized to a common temperature and electronically displayed in a resistance versus time graph including one or more previously normalized resistance values from previous resistance and temperature measurements. Based on information from the graph, a prediction or estimation can be made as to the remaining acceptable or satisfactory operating time of the electric motor. Such prediction or estimation may be used as an indicator for replacing or refurbishing the electric motor, or as an indicator for performing preventative maintenance on the electric motor. | 01-26-2012 |
20120105098 | AUTOMATED EMERGENCY POWER SUPPLY TEST USING ENGINE EXHAUST TEMPERATURE - An automated emergency power supply system (EPSS) and testing solution that records generator load values and engine exhaust temperature values to evaluate whether an EPSS test satisfies legislated test criteria. The EPSS test is carried out under software control, which initiates a test by instructing an automatic transfer switch (ATS) to change its status to a test status, causing the essential loads to be powered by a generator instead of a main utility power source. Power monitors record the ATS and generator status during the test as well as electrical parameter data from the ATS and generator and exhaust temperature data and other engine parameter data from the generator. When the test is concluded, the ATS is instructed to return the status to normal so that power delivery is resumed from the main power source. The electrical and engine parameter data is analyzed and compared against legislated test criteria to determine a pass/fail result of the EPSS test. | 05-03-2012 |
20120146683 | ANOMALY DETECTOR OF PERMANENT MAGNET SYNCHRONOUS ELECTRIC MOTOR - Under a condition that rotor rotation speeds ωes are equal, winding wire currents Id, Iq are equal, and winding wire inductances Ld, Lq are equal in first and second electric motors ( | 06-14-2012 |
20120161810 | METHOD AND DEVICE FOR DETECTING THE FAILURE OF AN EXCITATION CIRCUIT OF A POLYPHASE ALTERNATOR - The method of detecting the failure of the excitation circuit of a polyphase alternator controlled by a regulator comprises the following steps: a) electrical information (Iexc) is continuously taken from the excitation circuit ( | 06-28-2012 |
20120169369 | Apparatus And Method For Testing Number Of Turns On Coil - An apparatus for testing number of turns, used for testing the number of turns of a winding coil on an electrical machine stator with concentrated winding, comprising: a base ( | 07-05-2012 |
20120182040 | METHOD OF TESTING PARTIAL DISCHARGE OF ROTATING ELECTRICAL MACHINE DRIVEN BY INVERTER - In a rotating electrical machine, a conductive foil or conductive rubber is applied to the surface of insulation layer of a conductor series connection area or to the surface of insulation layer of a turn conductor of coils of rotating electrical machine winding, waveforms of grounding voltages of the individual turn conductor portions are measured through the medium of an electrostatic capacitance of the insulation layer of coil conductor series connection area or through the medium of the insulation layer of coil turn conductor, and a partial discharge is measured while measuring a voltage developing in the coil or across a winding turn in the coil from a difference between the waveforms of grounding voltages. | 07-19-2012 |
20120206162 | FAULT DETECTION FOR LAMINATED CORE - A method and system for evaluating the condition of a laminated core of an electric machine, and including a first yoke wound with a first winding and having a first pair of arms spanning between a first pair of teeth of the laminated core, and a second yoke wound with a second winding and having a second pair of arms spanning between a second pair of teeth. A power supply provides power to an electrical circuit defined by one of the first and second windings to produce a magnetic flux in the yoke corresponding to the one of the first and second windings and defining an excitation yoke. A monitoring module provides a measurement of a characteristic of an electrical circuit defined by the other one of the first and second windings to identify a fault corresponding to an eddy current between individual laminations in the laminated core. | 08-16-2012 |
20120206163 | Method for Monitoring a Permanent Magnet Motor - A test setup for a permanent magnet motor provides a method for identifying symmetry or asymmetry in the magnetic fields of the motor's permanent magnets. The setup comprises a test circuit that includes a fixed reference node that provides a stable reference to which the motor's common node can be compared. Observing the waveform of the voltage between the two nodes while the motor is running helps identify an imbalance in the magnetic fields of the motor's permanent magnets. | 08-16-2012 |
20120280709 | Compressor Protection And Grid Fault Detection Device - A compressor monitoring system includes current and voltage monitors, current and voltage averaging modules, a control module, and a switch. The current monitor measures a current drawn by a motor of a compressor. The current averaging module generates first and second average current values based on the current measured by the current monitor. The voltage monitor measures a utility power voltage. The voltage averaging module generates first and second average voltage values based on the voltage measured by the voltage monitor. The control module selectively generates a fault signal when a first ratio is greater than a first predetermined threshold and a second ratio is less than a second predetermined threshold. The first ratio is based on the first and second average current values. The second ratio is based on the first and second average voltage values. The switch deactivates the motor when the fault signal is generated. | 11-08-2012 |
20120313662 | TEST BOARD AND METHOD FOR TESTING ROTATION SPEED OF FAN - A method for testing rotation speed of a fan receives a duty cycle ratio related to the fan sent from a dial switch on a test board connected to the fan. The method transmits a pulse width modulation (PWM) signal based on the duty cycle to the fan to power rotation of the fan, then detects the PWM signal transmitted to the fan and a tachometer (TACH) signal transmitted from the fan. The method gathers the duty cycle ratio related to the fan from the PWM signal and an actual rotation speed of the fan from the TACH signal, and displays the duty cycle ratio and the actual rotation speed together on the test board. | 12-13-2012 |
20120319722 | METHOD AND APPARATUS FOR ALTERNATOR STATOR TURN-TO-TURN SHORT DETECTION - A method for detecting whether the stator in a vehicle alternator has a turn-to-turn short circuit. The method includes determining an output current or voltage signal of the alternator, where the output current or voltage signal includes a ripple current frequency as a result of an AC-to-DC conversion. The method determines the speed of the alternator and a current output of the alternator. The method then determines the ripple current frequency of the alternator from the alternator speed, and determines a winding frequency from the ripple current frequency. The method performs an FFT analysis on the voltage and current signal, determines an amplitude of the winding frequency and compares the amplitude of the winding frequency to a predetermined amplitude, where if the difference exceeds a predetermined threshold, a turn-to-turn short circuit is likely occurring. | 12-20-2012 |
20120319723 | ELECTRIC MACHINE FOR WHICH THE GROUNDING FUNCTION IS MONITORED AND METHOD - The grounding quality of an electric machine should be better monitored. Therefore, an electric machine is proposed, comprising a stator ( | 12-20-2012 |
20130076389 | CURRENT TRANSFORMER ASSEMBLY FOR USE WITH ELECTRICAL MONITORING SYSTEMS AND METHODS OF ASSEMBLING SAME - A current transformer assembly for use in an electrical monitoring system is described herein. The current transformer assembly includes a housing including a plurality of shielding members that at least partially define a cavity therein. The housing further includes an inner surface that defines an opening that extends therethough. A first current transformer is positioned within the housing. A second current transformer is positioned within the housing and is spaced a distance from the first current transformer to facilitate reducing electronic noise interference between the first and second current transformers. | 03-28-2013 |
20130093457 | METHOD FOR TESTING AN INVERTER DRIVE ROTATING ELECTRIC MACHINE - With a rotating electric machine testing method for applying a test voltage to an armature winding of the rotating electric machine to thereby test insulation performance of the armature winding, in the case where a rated voltage of the armature winding of the rotating electric machine is E, and an insulation test voltage of an armature winding of a sine wave voltage drive rotating electric machine at the rated voltage E is E/√{square root over (3)} or E, a test voltage V | 04-18-2013 |
20130106460 | Method for Detecting a Step Loss Condition | 05-02-2013 |
20130127490 | SURGE TESTING METHOD AND SYSTEM FOR A BAR-WOUND STATOR - A method for surge testing a bar-wound stator includes electrically connecting a conductive lead of a test system to a corresponding welded hair pin in each of the layers mid-way through the stator windings. A calibrated voltage surge is applied via the conductive leads into the windings of the stator at the welded hair pins. The method includes measuring a voltage drop between turns of the windings after applying the calibrated voltage surge, recording the measured voltage drop in memory of the test system, and executing a control event with respect to the stator when the measured voltage drop is more than a calibrated threshold voltage drop. A system for surge testing the bar-wound stator includes a test device having a capacitor for storing the calibrated surge voltage and a pin set that is electrically connected to the test device. The pin set includes the conductive wires and leads. | 05-23-2013 |
20130214811 | Detection Of A Missing Stator Slot Wedge In An Electrical Machine - A missing stator slot wedge in an electrical machine can be detected by analysing a current spectrum of the machine in a high frequency area. A current spectrum is provided from a current measurement, and values of the current spectrum in the high frequency area used to determine whether a stator slot wedge is missing or not. The conclusion can be based on values of a relative current amplitude I | 08-22-2013 |
20130222008 | METHOD FOR DIAGNOSING AN ELECTRICAL CIRCUIT - A method for diagnosing an electrical circuit including at least one electrical device, an actuator for the device controlled by a high side actuating switch and a low side actuating switch, and at least one additional switch not in series with any of the HS or LS switch, the method including: to each of the possible statuses of the circuit, giving a code; sequentially putting the circuit in at least some of these statuses for a given time period; during each of these periods, measuring voltage and/or current in different parts of the circuit and giving a code to the measurement; and establishing a diagnosis of correct functioning or of a malfunctioning of at least some elements of the circuit according to a pre-established correlation between the status codes and the measurement codes. | 08-29-2013 |
20130229203 | METHOD AND DEVICE FOR OFF-LINE TESTING OF ELECTRIC MOTORS - A method for off-line testing of an electric motor is disclosed. The motor having at least one stator winding, and a rotor arranged along a rotation axis. The method includes applying a periodic test signal to the at least one stator winding; collecting first measuring data, related to a physical quantity of the at least one stator winding while the rotor is being rotated about the rotation axis, from one or more waveform periods of the test signal, detecting first peak values of the first measuring data; forming second measuring data based on the first detected peak values, detecting second peak values of the second measuring data for the at least one stator winding; determining a mutual relationship between the at least a portion of the second peak values; and, providing, if the mutual relationship deviates from a predetermined relationship, a signal indicating a fault in the rotor. Also disclosed is an apparatus for performing the disclosed methods. | 09-05-2013 |
20130234752 | DEVICE AND METHOD FOR INSPECTION OF A STATOR CORE OF AN ELECTRICAL MACHINE - An automated EL CID inspection technique for the stator core of an electrical machine is provided. The inspection device includes a rail, a pickup coil and a coil support assembly. The coil support assembly includes a first part movable along the rail, and a second part where the pickup coil is actually installed. The second part is movable jointly with the first part along the rail, while also being movable relative to the first part in a direction towards or away from the stator core. A motor actuates a motion of the coil support assembly. During inspection, the motor is activated, upon which the coil support assembly moves along the rail while a specified distance is maintained between the stator core and the pickup coil by the relative motion between the first and second parts. The technique is particularly applicable in a step-iron portion of the stator core. | 09-12-2013 |
20130278282 | MONITORING AND FAULT DIAGNOSIS OF AN ELECTRIC MACHINE - In a method for monitoring a rotating electric machine ( | 10-24-2013 |
20130307577 | METHOD AND DEVICE FOR DETECTING A MALFUNCTION OF AN ELECTRIC MACHINE - The invention relates to a method for detecting a malfunction of an electric machine, a first variable (i | 11-21-2013 |
20140049285 | Method For Monitoring Demagnetization - A method for discovering demagnetisation faults of a permanent magnet synchronous generator, such as a wind power generator. The method is performed during operation of the synchronous generator and includes measuring the vibration of the stator, performing a frequency analysis of the vibration, and deducing whether the generator suffers from demagnetization of a permanent magnet, from the vibration analysis. Moreover, geometric eccentricity faults and electric short circuit faults may also be detected from the vibration. | 02-20-2014 |
20140062525 | INVERTER-DRIVEN ROTARY ELECTRIC MACHINE, INSULATION INSPECTION METHOD AND INSULATION INSPECTION APPARATUS - Insulation inspection method for an inverter-driven rotary electric machine includes: a step of applying, to an insulation sample ( | 03-06-2014 |
20140159768 | ELECTRIC LINEAR ACTUATOR ASSEMBLY AND METHOD OF ASSEMBLY - A method of constructing an electric linear displacement motor for use in a testing device includes providing a stator having as stator housing with internal coils and a through bore extending from a first end of the stator housing to the second end of the housing. First and second end supports are connected to the first and second ends of the stator housing. An armature having magnets retained therein is inserted into the stator housing such of the armature is supported by the first end support and the second end support. A plurality of set screws are inserted into threaded openings proximate both the first end and the second end of the housing. The set screws then support and retain the armature such that there is an annular gap between the armature and the coils. | 06-12-2014 |
20140167810 | FAULT DETECTION SYSTEM AND ASSOCIATED METHOD - A method implemented using a controller based device includes receiving a measured electrical signal from an electrical device of an electromechanical device and receiving a measured vibration signal from a mechanical device of the electromechanical device, coupled to the electrical device. The method further includes determining a first signal signature based on the measured electrical signal and determining a second signal signature based on the measured vibration signal. The method also includes determining a diagnostic parameter based on the first signal signature and the second signal signature and determining a fault in the mechanical device based on the diagnostic parameter. | 06-19-2014 |
20140266295 | ELECTRICAL POWER STEERING PHASE VOLTAGE OUTPUT DIAGNOSIS - A motor control diagnostic apparatus is provided. The apparatus includes a control module in communication with a multiple phase electric power steering motor, the control module configured to generate multiple phase duty cycle outputs based on a voltage command generated from a motor torque command and motor position. The apparatus also includes a diagnostic module configured to analyze a reasonableness of the duty cycle outputs based on comparing the duty cycle outputs to expected duty cycle outputs, wherein the expected duty cycle outputs are estimated based on determining the electrical revolution sector of each motor phase. | 09-18-2014 |
20140285230 | PARAMETER ESTIMATION SYSTEM AND METHOD FOR AN INDUCTION MOTOR - A method of estimating stator resistance of an induction motor is provided. The method includes applying voltage pulses through two phase paths of the motor for a plurality of electrical cycles to inject current in the motor, wherein the voltage pulses are applied until rotor flux of the motor is substantially stabilized and measuring stator voltage and stator current in response to the applied voltage pulses for each of the plurality of electrical cycles. The method also includes calculating the stator resistance based upon the measured stator voltages and the stator currents. | 09-25-2014 |
20140320163 | METHOD FOR MONITORING A PUMP - A method for monitoring the functioning of an electric motor-driven pump ( | 10-30-2014 |
20140333343 | DETECTION OF BENDING EFFECTS IN THE CASE OF ELECTRIC DRIVES - A method and a corresponding system for detecting a malfunction in an electric drive unit. The method comprises the following steps: ascertain (S | 11-13-2014 |
20140361807 | TEST APPARATUS AND METHOD FOR TESTING A FIRST AND/OR A SECOND ELECTRICAL MACHINE - A first and/or a second electrical machine is tested using a test apparatus that includes a torque transmitter having torque connections for the first and the second electrical machine and an electrical shaft having respective electrical connections for the first and the second electrical machine. The electrical shaft is designed to transmit at least five times as much electrical power between the respective electrical connections as can be supplied by a supply apparatus of the test apparatus from an external electrical energy source to the electrical shaft. This condition is assumed to be satisfied when the test apparatus lacks such a supply apparatus. A corresponding method using such test apparatus is also disclosed. | 12-11-2014 |
20140368233 | INSULATION INSPECTION INSTRUMENT - A continuity tester that has particular application for inspecting the insulation on the stator windings in an electric machine. The continuity tester includes a power supply, a brush having conductive bristles, and an analog-to-digital (A/D) converter. One terminal of the power supply is electrically coupled to the brush and another terminal of the power supply is electrically coupled to the A/D converter and the stator being tested. The conductive brush is selectively positioned against the exposed windings of the stator, and if an electrical circuit is formed as a result of loss of insulation, the potential at the input of the A/D converter drops, which can be detected. In one embodiment, the conductive brush is a manual brush that is moved across the stator windings, and in alternate embodiments the conductive brush is specially configured to be positioned against the conductive windings in an automated process. | 12-18-2014 |
20150015303 | PARTIAL DISCHARGE MEASUREMENT SYSTEM AND PARTIAL DISCHARGE MEASUREMENT METHOD BY REPEATED IMPULSE VOLTAGE - An impulse voltage generator uses a predetermined rectangular waveform signal and a high voltage to generate an impulse voltage. The high voltage is obtained by boosting an instruction voltage of the rectangular waveform signal on a per-cycle basis. A partial discharge frequency calculation section receives detection signals based on partial discharges occurring in an object to be measured by the application of the impulse voltage and counts the detection signal on a per-cycle basis as a partial discharge frequency. An application voltage signal observation circuit observes an application voltage signal indicating the impulse voltage applied to the object to be measured. In a first cycle in which the partial discharge frequency reaches a specified frequency or more, a voltage value acquiring section sets, as a partial discharge starting voltage, the peak value of the voltage indicated by the application voltage signal output from the application voltage signal observation circuit. | 01-15-2015 |
20150070047 | DIAGNOSTICS FOR SYSTEMS INCLUDING VARIABLE FREQUENCY MOTOR DRIVES - One embodiment is a diagnostic method for a system including setting a first diagnostic code based upon a condition of a DC bus of a variable frequency drive during a first drive state, setting at least one additional diagnostic code based upon a condition of at least one motor phase current during a second drive state, outputting first diagnostic information indicating a malfunction of the variable frequency drive if the first diagnostic code indicates a first error, and outputting second diagnostic information indicating a malfunction of a motor or a connector coupling the motor and the drive if the at least one additional diagnostic code indicates a second error. | 03-12-2015 |
20150077155 | MONITORING OF WIND TURBINE PERFORMANCE - A method for monitoring performance of an electricity generating system of a wind turbine is presented. A set of reference data is provided. The set of reference data is indicative of a correspondence between a performance parameter and at least two operational parameters. Measurement values for the performance parameter and the at least two operational parameters are received. The received measurement values and the set of reference data are compared. It is determined whether the measurement values deviate from the reference data. | 03-19-2015 |
20150077156 | INTERFACE CIRCUIT FOR DETECTING FAULT OF RESOLVER AND METHOD THEREOF - An interface circuit for detecting a fault in a resolver is provided. More specifically, the interface circuit includes the resolver connected to an intermediate point of a stator coil of a first output terminal for a sine wave signal and an intermediate point of the stator coil of a second output terminal for a cosine wave signal to output the sine and cosine wave signals as a common mode signal. Also includes is resolver fault detection interface unit that adjusts a gain and an offset of the sine wave signal and the cosine wave signal in order to adjust the sine wave signal and the cosine wave signal received as a common mode signal to a frequency that can be suitably applied to an analog/digital terminal of a microcomputer, and to allow high-frequency components of the sine wave signal and the cosine wave signal to pass therethrough. | 03-19-2015 |
20150091606 | Method for Checking an Exciting Current of a Synchronous Machine in Generator Operation - The method includes operating the synchronous machine in idle operation; recording a phase voltage measured value of the synchronous machine; ascertaining a phase voltage expected value by allocating stored characteristics map values for the phase voltage, for the exciting current and the recorded rotational speed of the synchronous machine; and comparing the phase voltage expected value to the phase voltage measured value. Also described is a diagnostic device for carrying out this method, as well as a corresponding computer program product. | 04-02-2015 |
20150130503 | METHOD OF PROCESSING RECURRENT SURGE OSCILLOGRAPH DATA TO ENABLE MORE PRECISE LOCATION OF GENERATOR ROTOR INTER-TURN SHORTS AND GROUND FAULTS - A system and method for locating inter-turn short circuits or ground faults in a rotor winding of an electrical generator. The method analyzes data from a Recurrent Surge Oscillograph (RSO) test, identifies a spike or anomaly in a reflected RSO signal, determines an elapsed time between a transmitted signal and the anomaly in the reflected signal, calculates a distance along the winding conductor to the inter-turn short circuit or ground fault based on the elapsed time, and uses a geometric model of the winding conductor to identify a location of the fault based on the distance. The location of the inter-turn short circuit or ground fault specifies a coil number, a turn number within the coil and a position within the turn. | 05-14-2015 |
20150130504 | METHOD AND APPARATUS FOR OFF-LINE TESTING OF MULTI-PHASE ATERNATING CURRENT MACHINES - A method and apparatus are provided for off-line testing of a multi-phase alternating current machine. A method includes determining, at a first rotor position, a physical stator quantity of each stator winding by applying a test signal to each stator winding, and determining a first joint physical stator quantity by summing the determined physical stator quantities of the stator windings. A method includes determining, at a second rotor position, a physical stator quantity of each stator winding by applying a test signal to each stator winding, determining a second joint physical stator quantity by summing the determined physical stator quantities of the stator windings, comparing the second joint physical stator quantity with a previously determined first joint physical stator quantity, and determining a fault condition of said multi-phase alternating current machine if the first joint physical stator quantity differs from the second joint physical stator quantity. | 05-14-2015 |
20150145554 | METHOD FOR INSPECTING WYE RING - A method for inspecting a wye ring in a generator includes the steps of dismantling the generator to gain access to the wye ring and at least a portion of a rotor, applying a test signal to the rotor and measuring an inductive voltage at two or more locations near the wye ring. A comparing step compares results from the measuring step to determine if a fault exists in the wye ring. A predetermined difference in inductive voltage measurements indicates presence of the fault. | 05-28-2015 |
20150309120 | ECONOMIZER DAMPER FAULT DETECTION - A method of evaluating damper operation for a heating, ventilation and air conditioning (HVAC) system includes moving a plurality of dampers of the HVAC system collectively to a baseline damper position. The plurality of dampers is positioned at a flowpath including a fan driven by a motor. The fan is operating by switching the motor on and a baseline output level at the motor is measured. A first damper of the plurality of dampers is commanded to move from the baseline damper position to a first damper position and a first output level at the motor is measured. The first output level is compared to the baseline output level. A difference is indicative of successful movement of the first damper from the baseline damper position to the first damper position. | 10-29-2015 |
20150323605 | METHOD AND SYSTEM FOR MOTOR FAILURE DETECTION - Systems and methods for detecting developing faults in a flow generator or ventilator during therapeutic use thereof are provided. The motor current may be measured to estimate the torque input by the motor, while the output torque from the impeller may be determined (e.g., as inferred from the motor control system model and/or by consulting a lookup table). One or more transducers may collect data useful in determining the input and output torques. A difference between the input (to the motor) torque and the output (from the impeller) torque may be calculated. The difference, optionally filtered using a low-pass filter to reduce noise, may be compared to a predetermined threshold once or over a period of time to detect gross failures and/or developing failures. Once a failure or developing failure is detected, a user may be alerted and/or the flow generator may be placed into a “service required” mode. | 11-12-2015 |
20150323606 | SENSOR OUTPUT DETERMINATION APPARATUS - In a sensor output determination apparatus, a converter converts analog outputs of two sensors of a first-phase to two digital signals representing a current of the first-phase, and converts analog outputs of two sensors of a second-phase to two digital signals representing a current of the second-phase. The determination section determines whether the analog outputs of the two sensors of the first-phase are normal based on the two digital signals representing the current of the first-phase, and determines whether the analog outputs of the two sensors of the second-phase are normal based on the two digital signals representing the current of the second-phase. The transmission section transmits one of the two digital signals representing the current of the first-phase, one of the two digital signals representing the current of the second-phase, and a digital signal representing a result of determinations of the determination section, to the outside of the apparatus. | 11-12-2015 |
20150331051 | Deterioration Diagnosis System - Provided is a deterioration diagnosis system which diagnoses deterioration of an N-phase rotational machine (N denotes a natural number). The deterioration diagnosis system includes a first current sensor to be attached individually to at least lead wires of (N-1)-phases in a rotational machine, the first current sensor being able to detect a current amplitude arising from a plurality of deterioration causes, and a second current sensor to be attached collectively to the lead wires of all phases in the rotational machine, the second current sensor being able to detect a current amplitude arising from a plurality of deterioration causes. | 11-19-2015 |
20150377969 | MAINTENANCE CHECKING SYSTEM AND METHOD FOR DENTAL HANDPIECE, AND SYSTEM AND METHOD FOR CONTROLLING DRIVE MOTOR - A method for maintenance checking of a dental handpiece is disclosed. The method comprises measuring in advance no-load current values of a drive motor, with a handpiece known as being in usable condition and a handpiece known as insufficiently maintained respectively connected thereto and operated in no-load condition, storing as reference data the no-load current values of the drive motor together with associated data relating to degree of maintenance, measuring a no-load current value of the drive motor with a dental handpiece to be checked connected thereto and operated in no-load condition, and determining whether the handpiece checked is usable, requires maintenance, or is unusable, by comparing the measured no-load current value with the reference data. | 12-31-2015 |
20160003316 | METHOD FOR FUNCTIONAL TESTING OF A HOLDING BRAKE OF AN ELECTRIC MOTOR - To improve the reliability of a functional test of a holding brake ( | 01-07-2016 |
20160025796 | METHOD OF DETECTING WIRING MISMATCH OF RESOLVER - According to the present disclosure, there are provided a method of determining which one of first and second input signals Rez+ and Rez− is shorted to ground based on a magnitude of a Lissajous signal, a method of determining which one of first and third output signals S | 01-28-2016 |
20160025811 | SYSTEMS AND METHODS FOR MONITORING AND PROTECTING AN ELECTRIC POWER GENERATOR - Protection of an electrical generator includes determining a rotor and stator components using rotor and stator electrical signals, calculating a unbalance and/or differential component using the stator and rotor components, and determining a stator or rotor fault based on the unbalance and/or differential component. Further, the faulted phase and/or zone of a stator fault may be determined using the stator positive sequence voltage and negative sequence current. | 01-28-2016 |
20160033579 | DYNAMO-ELECTRIC MACHINE WITH INSULATION MONITORING - An air-cooled dynamo-electric machine, in particular an enclosed-ventilated dynamo-electric machine includes a stator with a winding system which forms end windings at the end faces of the stator. At least the end winding has at least one monitoring element in its insulation layer, or in an additional layer which is applied to this insulation layer, for the purpose of monitoring the insulation thickness of the end winding. | 02-04-2016 |
20160033580 | Detecting Faults in Turbine Generators - Turbine generator faults can be detected by receiving a current signal from the turbine generator, and synchronously sampling the current signal to obtain a set of current signal samples that are evenly spaced in the phase domain, in which phase differences between adjacent current signal samples in the set of current signal samples are substantially the same. The process includes generating a frequency spectrum of the current signal samples, identifying one or more excitations in the frequency spectrum, and detecting a fault in the turbine generator based on the one or more excitations in the frequency spectrum. | 02-04-2016 |
20160041228 | ELECTRIC MACHINE FAULT DETECTION - A electric machine ( | 02-11-2016 |
20160116538 | MOTOR DRIVING DEVICE AND METHOD FOR VEHICLE - A motor driving device and method for a vehicle are provided to adjust and diagnose an air-conditioning motor by sensing an output signal and a current of a feedback sensor. The motor driving device includes a feedback sensor that configured to output a feedback voltage by detecting a rotation angle of a motor. In addition, a controller is configured to generate a substantially constant current that corresponds to an operation state of the motor and determine a driving state of the motor by combining the constant current with the feedback voltage. | 04-28-2016 |
20160124049 | SYSTEM AND METHOD OF ELECTRIC MOTOR FAULT DETECTION - A system for detecting faults in a motor includes a drive circuit, a detection circuit, and a controller. The drive circuit is configured to apply a drive signal to a motor. The detection circuit is configured to detect a response signal generated when the drive signal is applied to the motor. The controller is configured to determine a motor fault based on a comparison of the response signal to an expected signal for the drive signal applied to the motor. The drive signal is selected to generate a rotating magnetic field in the motor with a rotation-frequency greater than a maximum mechanical-response-frequency of the motor. | 05-05-2016 |
20160146890 | DIAGNOSIS APPARATUS FOR FIELD WINDING TYPE ROTATING ELECTRIC MACHINE AND DIAGNOSIS METHOD FOR FIELD WINDING TYPE ROTATING ELECTRIC MACHINE - The present invention relates to a diagnosis apparatus for a field winding type rotating electric machine. The diagnosis apparatus includes an internal power supply circuit having an open fault determination potential, and determines, on the basis of a measurement result of a voltage value of a circuit that includes the field winding in a fault diagnosis condition, that a disconnection has occurred in the circuit when the measurement result is within an open fault determination voltage range including the open fault determination potential, that a power fault has occurred in the circuit when the measurement result is within a power fault determination voltage range including the positive electrode potential, and that an earth fault has occurred in the circuit when the measurement result is within an earth fault determination voltage range including the negative electrode potential. | 05-26-2016 |
20160178699 | METHOD FOR DETERMINING A FAULT IN AN ELECTRONICALLY COMMUTATED ELECTRIC MOTOR | 06-23-2016 |
20160252578 | METHOD FOR DETECTING A FAILURE IN A THREE-PHASE ALTERNATOR, DEVICE FOR DETECTING FAILURES AND ASSOCIATED COMPUTER PROGRAMME | 09-01-2016 |
20160377682 | METHOD AND APPARATUS FOR DETERMINING A PHYSICAL QUANTITY OF AMULTIPHASE SYNCHRONOUS MACHINE - To reliably determine a state variable (G) of a polyphase synchronous machine ( | 12-29-2016 |
20170234929 | ELECTRICAL PATTERN MONITOR | 08-17-2017 |
20190146037 | DEVICE FOR DIAGNOSING A MECHANICAL SYSTEM WHICH IS DRIVEN BY MEANS OF AN ELECTRIC DRIVE MOTOR | 05-16-2019 |