Abstract: A device for detecting a slot wedge, an air gap and a broken rotor bar is provided, where a sequential circuit generates double concurrent pulses; the sequential circuit is connected to driving power modules; the driving power modules are connected to front-end interface circuits; the front-end interface circuits convert the double concurrent pulses into corresponding magnetic-field pulses; the magnetic-field pulses are transmitted to power supply terminals on adjacent phases of stator windings through impedance matching pins and coupled at a corresponding coil, air gap and squirrel cage rotor to generate single groups of cyclic rotating magnetic potentials; single rotating magnetic potentials are sequentially generated in adjacent slots on each of the phases of the stator windings; rotating electric potentials in magnetic circuits with two symmetrical phases are magnetically coupled to form distributed coupling magnetic field reflected full-cycle waves for reflecting a difference of a corresponding slot wedg

Abstract: A system for magnetic field testing comprising a magnetic field generation device configured to generate a magnetic field in a rotor, a plurality of magnetic field measurement devices configured to measure a magnetic field at a predetermined position on the rotor, a drive mechanism configured to rotate the rotor and a test system configured to record the plurality of magnetic field measurements as a function of an angular position of the rotor.

Abstract: A method and a system of detecting winding fault during online operation of an electrical machine, said method comprising, acquiring a set of signals from the machine over a period, said set of signals comprising two or more magnetic flux signals, each flux signal obtained from a respective flux sensor positioned on the external surface of the machine; extracting an internal winding fault indicator from the set of signals; comparing the internal winding fault indicator with a baseline indicator; and determining the internal winding fault when the internal winding fault indicator deviates from the baseline indicator by a threshold.

Abstract: Signal processing for determining a rotor position without the use of encoders. To this end, test signals are applied to the electrical currents in the phase connections of an electric machine, and the total currents in the phase connections of the electric machine are measured. The current responses to the test signals are determined by establishing the difference between the measured phase currents and the setpoint-value settings for the phase currents. On the basis of this difference, any method for calculating the rotor angle position can be performed.

Abstract: The invention provides a diagnostic device including: an input/output unit that receives an input of a current value indicating a value of a current of an electric motor measured by a sensor; a frequency analysis unit that converts the current value measured by the sensor into a frequency intensity; a deterioration mode decomposition unit that uses a state mode model indicating a change situation of a frequency intensity in a part constituting the electric motor to calculate an activity level indicating a time series change of a deterioration intensity for each state mode model from the frequency intensity; and an abnormality determination unit that determines a deterioration and an abnormality of each part using the activity level.

Abstract: A system for estimating a severity of a bearing fault in an induction motor, uses a set of filters and a set of quantitative models designed for a set of fault frequencies. The system, upon receiving the measurements of the stator current, extracts the first fault current from the stator current using the first filter, determine the first mutual inductance variation from the first fault current using the first quantitative model, and classify the first mutual inductance variation with the fault severity classifier to determine the severity of a first type of fault in the induction motor. Similarly, the system classifies a second type of fault using the second filter and the second quantitative model. The system outputs one or combination of the severity of the first type of fault in the induction motor and the severity of the second type of fault in the induction motor.

Abstract: A current detector and a detection unit are provided. The current detector is connected to at least one of drive current lines of a rotary machine. The detection unit performs an orthogonal detection on a main frequency detected by the current detector, and extracts a magnitude of a sideband wave. Then, a state of the rotary machine is diagnosed from the magnitude of the extracted sideband wave.

Abstract: A system for magnetic field testing comprising a magnetic field generation device configured to generate a magnetic field in a rotor, a plurality of magnetic field measurement devices configured to measure a magnetic field at a predetermined position on the rotor, a drive mechanism configured to rotate the rotor and a test system configured to record the plurality of magnetic field measurements as a function of an angular position of the rotor.

Abstract: In a device for diagnosing a mechanical system driven by an electric drive motor, the drive motor thereof, and the shifting device thereof include at least one sensor for detecting the current curve in a conductor of the electric connection of the drive motor. The precision and the degree of detail of the diagnosis are to be improved compared to the prior art and expanded to include the drive motor and the shifting device in order to improve the efficiency and aim of the maintenance process carried out in response to the diagnosis. This is achieved in that the device additionally has sensors for detecting the voltage curves in the conductors of the electric connection of the drive motor, wherein each conductor is paired with a sensor for detecting the current curve and with a sensor in interaction with a sensor in order to detect the voltage curve.

Abstract: A method for monitoring and detecting defects in a doubly-fed asynchronous machine including a stator and a rotor, said method implemented by computer means. The method comprises: a. receiving a current and a voltage measurement of the stator, and a measurement of relative rotation speed between the stator and the rotor; b. deducing a stat or power as a function of time; c. performing a harmonic analysis on the resulting stator power including applying a wavelet transform to the stator power; d. comparing the resulting harmonic representation to a reference harmonic representation, where said reference harmonic representation is selected as a function of the rotation speed measurement, so as to detect possible defects in said machine as a function of possible differences identified by the comparison.

Abstract: A tool system for tightening a retrightenable wedge system in a slot of a generator stator core is presented. The tool system includes a carriage assembly and a wedge tool assembly that is pivotally coupled to the carriage assembly. The carriage assembly includes motorized drives that axially moves the tool system along the slot and holds the tool system on the slot at an axial position. The wedge tool assembly includes a torqueing socket to tighten the retightenable wedge assembly in the slot. The torqueing socket is driven by a worm gear arrangement.

Abstract: A method of classifying a stator winding fault in a brushless synchronous generator includes measuring an electrical parameter of the stator winding and classifying the fault by calculating positive or negative sequence harmonics of the parameter and comparing one or more harmonic component to a threshold.

Abstract: A method of estimating the torque of an axle of a running motor, comprising receiving data indicative of the total electrical active power, P, supplied to the motor, determining the electromechanical power, Pem, supplied to the axle using the data indicative of the total electrical active power, P, receiving data indicative of a rotor speed, nr, or rotor frequency, fr, of the axle, determining an angular rotor frequency, ?r, of the axle using the data indicative of rotor speed, nr, or rotor frequency, fr, of the axle, and determining electromechanical axle torque, Tem, using the determined electromechanical power, Pem, and the determined angular rotor frequency, ?r.

Abstract: Methods and systems for real-time, in-service, non-intrusive condition monitoring of turn-to-turn faults (TTFs) of an induction motor stator in a drive system. A time-domain-based signal processing technique, mathematical morphology, can be used for condition monitoring based on the radiated electromagnetic (EM) field from the induction motor. The vector control technique implemented to drive the induction motor can be direct torque control, and the mathematical morphology technique can detect incipient TTFs based on the radiated magnetic field.

Abstract: The present disclosure relates to a method, a device, and a computer program for measuring deflections at the stator end winding of an electric machine. Disclosed is a measurement method, a device, and a computer program for measuring vibrations at the stator end winding of an electric machine, with the steps of arranging sensors at the stator end winding at different positions, measuring the vibrations with the sensors, measuring the amplitudes and phases of the radial and tangential vibrations with the sensors, deriving displacements of the stator end winding due to vibrations by means of the measured amplitudes and/or phases of the radial and tangential vibrations.

Abstract: A system that applies a counteracting voltage or current to a rotating shaft to minimize a grounding voltage signal of the shaft, measures and analyzes the counteracting signal, and provides expert system logic that compares prior learned waveforms and models of baseline, fault, and degradation waveforms to operational waveforms to determine and predict faults and degradation events. Self-learning logic analyzes the operational waveforms to look for changes, and finds or predicts fault and degradation events in relation to archived characteristics of earlier waveforms. It then adds characteristics of predictive waveforms to the database of model waveforms, and updates rules and thresholds in the expert logic based on the found predictors. It may further calculate and continuously refine a counteracting signal waveform to minimize the shaft grounding waveform.

Abstract: The invention relates to a method for detecting an error in a generator unit which has an electric machine (100) with a rotor winding (110), a stator winding (120) transformer-coupled to the rotor winding (110), and a rectifier (130) connected to said stator winding, via which the electric machine (100) is connected to an onboard power supply (150) of a motor vehicle, wherein a decision is made, depending on a magnitude of a correlation (K1, K2) between a curve of an excitation current (IE) flowing through the rotor winding (110) of the electric machine (100) and a curve of a voltage drop (UY, UDF) on one side of the transformer, as to whether the error is present or not.

Abstract: Current supplied to electrical submersible pumps in wells is monitored, and signal processing based on wavelet analysis and phase diagram analysis is performed on the data obtained from monitoring. An incipient malfunction of the electrical submersible pump, such as one due to scale build-up in and around the pump, can be detected at an early stage.

Abstract: An operation mode specifying unit specifies an operation mode of a machine by comparing time-series data of an amplitude and a frequency of measurement data obtained from a sensor with definition data of the operation mode of the machine created in advance by an operation mode data creation unit. In addition, an abnormality diagnosis unit performs processing of cluster analysis for the measurement data obtained from the sensor or the like, and diagnoses abnormality of the machine according to diagnosis procedure information that is set in advance depending on the set operation mode and an abnormality mode of the machine.

Abstract: An integrated circuit is provided that comprises a resistor, a first superconducting structure coupled to a first end of the resistor, and a second superconducting structure coupled to a second end of the resistor. A thermally conductive heat sink structure is coupled to the second end of the resistor for moving hot electrons from the resistor prior to the electrons generating phonons.

Abstract: An electrical safety analyzer, including: a transparent outer casing; at least one light emitting diode (LED) disposed within the transparent outer casing; a processor and addressable memory, where the processor is configured to: run one or more tests for electrical safety; determine a pass or fail condition for each test; and illuminate the at least one LED based on the determined condition, where an illumination of the at least one LED illuminates the transparent outer casing.

Abstract: A method for testing a transformer including a first inductance and a second inductance, which is galvanically isolated from the first inductance, the inductances being connected in a first circuit and in a second circuit, correspondingly, the method comprising: —applying a DC voltage between a first circuit point and a second circuit point in the first circuit; —tapping off a test voltage between two circuit points in the first or second circuit, wherein one of the two circuit points is different than the first circuit point and the second circuit point; and —testing the transformer on the basis of a comparison between the DC voltage and the test voltage.

Abstract: A diagnostic monitoring system and method is employed for one or more vapor compression systems such as air conditioners and heat pumps having a compressor, an indoor air handler fan coil and an outdoor condensor. Temperature, voltage and current sensors are provided at the outdoor condensor to determine that at least one vapor compression system is operating properly. Data obtained from the sensors is wirelessly transmitted to a receiving-device for use by the systems' custodian or repair service provider and includes information concerning an occurrence of periods when one or more of the vapor compression systems are operating at an abnormal state.

Abstract: According to one aspect, embodiments of the invention provide a power meter comprising a voltage sensor, at least one current and phase sensor circuit, and a central metering unit, wherein the voltage sensor is further configured to measure a voltage on an input line and transmit a signal related to the voltage to the central metering unit, wherein the at least one current and phase sensor circuit is further configured to measure a current and a voltage phase shift of a feeder line, and to transmit a signal related to at least one of the current of the feeder line and the voltage phase shift of the feeder line to the central metering unit, and wherein the central metering unit is configured to calculate power provided to a load via the feeder line based on the signal transmitted from the at least one current and phase sensor circuit.

Abstract: A method for controlling a chain-link power converter including three phase legs, each of which phase legs includes a plurality of series-connected converter cells, each of the cells including a DC capacitor, the phase legs being connected in a delta configuration. The method includes detecting an unsymmetrical voltage condition at a terminal of the converter; determining a ratio between a zero sequence and a negative sequence component of a compound current to be injected into the converter, based on the detected unsymmetrical voltage condition; calculating the compound current comprising the zero sequence component and the negative sequence component in accordance with the determined ratio; and injecting the compound current into the converter to control the converter in view of the detected unsymmetrical voltage condition.

Abstract: In a method for testing a bar winding of a rotor of a rotating electrical machine, a rotor temperature is detected by a thermal radiation sensor, which is arranged in a stator of the rotating electrical machine. A thermal radiation sensor is used with a resolution suitable for the thermal detection of individual bars of the bar winding. The rotor is rotated at a speed that is lower than a limit frequency of the thermal radiation sensor divided by the number of bars of the bar winding, and the thermal radiation of the rotor is detected by the thermal radiation sensor. The thermal radiation sensor is sampled at a sampling frequency that is higher than the speed of the rotor multiplied by the number of bars and the sampled values of the thermal radiation sensor are evaluated.

Abstract: A structure for measuring iron loss of a motor stator core is provided. The structure includes an auxiliary core whose both end surfaces in a longitudinal direction come in contact with inner end surfaces of two adjacent stator teeth among a plurality of stator teeth in a radial direction in order to measure iron loss of a stator core in which a plurality of slots and the plurality of stator teeth are alternately formed on an inner circumferential surface of a stator yoke in a circumferential direction. A pair of excitation windings is provided at portions of the auxiliary core in the longitudinal direction spaced-apart from each other. A B-coil that is a sensor coil is provided at the auxiliary core so as to be positioned inside any one excitation winding of the pair of excitation windings.

Abstract: A method for monitoring an insulation fault in an electric network with at least one electric power system supplying electric power to one or more electric loads, and at least one insulation resistance monitor is provided, wherein the at least one electric power system includes at least one electrical power source, and wherein the at least one insulation resistance monitor monitors an insulation resistance between terminal leads of the at least one electric power source and at least one reference potential. The steps are performed of disconnecting the at least one electric power source from the one or more loads by opening each terminal lead; measuring the insulation resistance between the electric circuit of at least one electrical power source and the reference potential; measuring the insulation resistance for the total electric network; closing the second terminal lead with the first terminal lead open; and measuring the insulation resistance for the total electric network.

Abstract: A method and system of tolerance testing a component using data measurements from a single test setup within a test apparatus are described. The method includes receiving the data measurements obtained with the single test setup. The method also includes separating, at the processor, the data measurements from a relative positioning of an element of the test apparatus and performing, at the processor, a virtual setup of the component to obtain additional data measurements related to one or more parts of the component. The method additionally includes determining, at the processor, whether a parameter associated with the one or more parts meets a specified tolerance based on the additional data measurements obtained from the virtual setup.

Abstract: A variable reluctance device includes first and second magnetic members, a coil, a measurement coil, and a control unit. The first and second magnetic members are displaceable relative to each other to provide a magnetic circuit having a variable reluctance. The coil for, in use, receiving a current for generating a magnetic flux through the magnetic circuit. The measurement coil for generating a measurement signal representative of the magnetic flux through the magnetic circuit, whereby the measurement coil is arranged to substantially enclose the magnetic flux through the magnetic circuit. The control unit arranged to receive the flux signal at an input terminal and, in response, provide a control signal based on the measurement signal at an output terminal for controlling an amplitude of the current or a force of a further device. The device can e.g., be applied in a stage apparatus or a lithographic apparatus.

Abstract: There is provided a method for determining an abnormality during operation of a high voltage disconnect switch, the method comprising: determining a current position of an arm of the high voltage disconnect switch operatively connected to a motor, the motor being operated for driving the arm of the high voltage disconnect switch; determining a torque of the motor corresponding to the current position of the arm; comparing the torque of the motor to a torque threshold for the current position of the arm; and outputting an abnormality signal based on the comparison.

Abstract: A failure detecting apparatus that detects an isolation failure between a plurality of coils included in a signal detection apparatus. The failure detecting apparatus includes a voltage applying unit that applies a DC voltage to a coil in the plurality of coils; a differential signal generating unit that generates a differential signal from a voltage at the coil and a predetermined voltage; a threshold voltage setting circuit that outputs a threshold voltage; and a comparator that compares the differential signal with the threshold voltage, thereby detecting whether or not an isolation failure exists. The differential signal generating unit includes either first setting unit for setting an absolute value of the differential signal to be amplified with a predetermined gain or second setting unit for setting the predetermined voltage to be different from a ground potential, and the predetermined gain is set to a value different from one and zero.

Abstract: 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.

Abstract: Systems, methods and apparatus for monitoring rub detection in a machine are provided. An electrical signal may be provided for transmission to and into a component of the machine. A capacitance associated with the electrical signal in the component may be monitored. Based at least in part upon a determined change in the monitored capacitance, a potential rub condition for the component of the machine.

Abstract: A method of testing a transformer prior to installation in a high-pressure environment wherein the transformer comprises a transformer core comprising a stack of a plurality laminations, is provided. The method comprises applying a mechanical compression force to the stack, the force being at least equivalent to the ambient pressure of the high-pressure environment; and testing the electrical efficiency of the transformer.

Abstract: A ripple spring is provided having one or more conductive layers, and one or more non-conductive layers. The conductive layers and the non-conductive layers are laminated together to form a symmetrical stack of layers. A method is also provided for monitoring the ripple spring. The method includes the steps of providing a ripple spring that holds a winding in place, where the ripple spring is positioned at least partially within a stator slot defined within an electromechanical device. Providing a conductive layer disposed within the ripple spring, and generating signals from the conductive layer, the signals corresponding to at least one aspect of the ripple spring. An analyzing step analyzes the signals to determine the at least one aspect of the ripple spring, wherein the at least one aspect facilitates an identification of faults in the ripple spring.

Abstract: The N1(s) turns of a first output winding is divided by a split ratio ? into N1a(s) turns of a lower-layer first output winding and N1b(s) of an upper-layer first output winding. The lower-layer first output winding is continuously wound around all slots as the undermost layer. A second output winding is continuously wound around all slots over the lower-layer first output winding. An upper-layer first output winding is continuously wound around all slots over the second output winding. The split ratio ? is adjusted only in the slots where the detection accuracy decreases. This equalize the contribution of the first output windings and the second output winding to the flux linkage, thereby achieving high angle detection accuracy.

Abstract: 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 (6); a rod-shaped rotor bracket (4) around one end of which an excitation coil (1) is wound and around the other end of which a standard coil (2) is wound; a joining member for joining the base (6) with the rotor bracket (4) so that the base (6) and the rotor bracket (4) can rotate relative to each other, wherein the plane of the base (6) is parallel to the rotor bracket (4); a fixing member for fixing the electrical machine stator (5) with concentrated winding to the base (6) so as to make the stator (5) concentric and coplanar with the rotor bracket (4); a galvanometer (17) connected to the standard coil (2), which is connected to the tested coil (3) of the stator (5) in reverse polarity to form a loop during testing. Also provided is a method for using the apparatus to test the number of turns.

Abstract: The N1(s) turns of an output winding is divided by a split ratio ? into N1a(s) turns of an output winding (1a) and N1b(s) turns of an output winding (1b). The output winding (1a) is continuously wound around all slots as the undermost layer. Output winding 2, which is different in phase by 90 degrees from the output winding (1a), is continuously wound around all the slots over the output winding (1a). An output winding (1b) is continuously wound around all the slots over output winding 2. This equalizes the contribution of the output winding and output winding 2 to the flux linkage, thereby achieving high angle detection accuracy.

Abstract: Embodiments of the present invention relate to methods, systems, a machine-readable medium operable in a controller, and apparatus for controlling a multi-phase inverter that drives a multi-phase electric machine. When a sensor fault is detected, a phase current angle is computed based on the feedback stator currents, and used to estimate an angular velocity and an angular position of a rotor of the multi-phase electric machine. When the estimated angular velocity of the multi-phase electric machine is less than a transition angular velocity threshold, an open-circuit response can be applied at the multi-phase inverter by controlling all switches in the multi-phase inverter drive to be open. By contrast, when the estimated angular velocity is greater than the transition angular velocity threshold, a short-circuit response can be applied at the multi-phase inverter by controlling selected switches in the multi-phase inverter drive to connect all phases of the multi-phase inverter to a single bus (e.g.

Abstract: 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 endeavored 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 (fsp), said operating point being compared to a former operating point.

Abstract: A method for detecting an anomaly in an induction machine includes obtaining or receiving a signal from the induction machine; processing the signal so as to obtain a low frequency signal, then rectifying the low frequency signal; and, declaring if the anomaly is present, based on the rectified low frequency signal. A system for detecting anomalies is also disclosed. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.

Abstract: A detecting station of a winding product and a method for detecting an inter-turn short circuit are provided. The method includes following steps. First, a high voltage pulse is input to two ends of a winding of a winding product. Next, a voltage value of an electrifying process of the winding is extracted for generating an extracting data. Finally, a time-frequency converting operation is performed to the extracting data, and a time-frequency analysis information is generated for indicating whether or not the inter-turn short circuit is occurred in the winding.

Abstract: A system and method for detecting a rotor fault condition in an AC induction machine is disclosed. The system includes a processor programmed to receive voltage and current data from an AC induction machine, generate a current frequency spectrum from the current data, and identify rotor-fault related harmonics in the current frequency spectrum. The processor is also programmed to calculate a fault severity indicator using the voltage and current data, identified rotor-fault related harmonics, and motor specifications, analyze the fault severity indicator to determine a possibility of rotor fault. The processor generates an alert based on the possibility of rotor fault.

Abstract: A health monitoring arrangement for a solenoid includes an armature for coupling to the solenoid, the armature being displaceable proportional to a driving current applied to the solenoid. A monitoring coil is wound around the armature such that the armature is displaceable relative to the monitoring coil. A voltage monitor coupled to the monitoring coil generates a voltage signature in respect of the solenoid that is proportional to the armature displacement. An analyzer analyzes the voltage signature to determine the health of the solenoid. Also a method of monitoring the health of a solenoid is provided.

Abstract: Removal of the rotor of a large electrical machine is costly and time consuming, and in particular the outage time of a power plant, which is needed for the removal of a generator rotor, is very expensive and should be minimized. To avoid opening of the generator for inspection and maintenance instrument carriages can be used. A method allows the reliable guidance for an in-situ instrument carrier inside the annular gap of a generator and a corresponding instrument carrier. The method avoids the use of sensors and active control systems for the guidance of the instrument carrier. A passively self-guiding system and method takes advantage of the internal structure of a generator and uses the passive centering properties of magnets to guide the instrument carrier through the annular gap of a generator.

Abstract: In an abnormality diagnosing system for first and second current sensors for measuring a current, an obtaining unit obtains at least one pair of measured values of the first and second current sensors. The at least one pair of measured values is measured by the first and second current sensors at a substantially same timing. A diagnosing unit diagnoses whether there is an abnormality in at least one of the first and second current sensors based on a function defining a relationship between the at least one pair of measured values of the first and second current sensors.

Abstract: Systems, methods and apparatus for monitoring rub detection in a machine are provided. An alternating current voltage signal may be transmitted or communicated to at least one component of the machine. The transmitted signal may be monitored in the at least one component and at least one characteristic associated with the monitored signal may be compared to an expected value for the at least one characteristic. Based at least in part on the comparison, a rub condition or potential rub condition may be identified between the at least one component and another component of the machine.

Abstract: A method of controlling a washing machine and a motor determines whether a BLDC motor is in a normal state in software without hardware and a user is notified of an abnormal state of the BLDC motor if the BLDC motor is in an abnormal state, thereby ensuring safety. When the motor is rotated, the state of the motor is determined by applying harmonics to a voltage that is applied to a motor and analyzing an output frequency characteristic. When the motor is stopped, the state of the motor is determined by estimating the temperature of the motor.

Abstract: Systems and methods are provided for identifying a fault condition in stator windings in an electric motor. A method comprises applying a first signal at a first electrical angle to the stator windings and measuring a second signal from the stator windings in response to the first signal. The method further comprises determining a measured response for the electric motor at the first electrical angle based on the second signal and obtaining a nominal response for the electric motor at the first electrical angle. A fault condition is identified when a magnitude of the difference between the measured response and the nominal response is greater than a threshold value.