Abstract: The invention relates to the generation of RF pulses for MRI applications.

Abstract: One object is to provide a method and a device for calculating core loss accurately. A calculation method includes: calculating core loss characteristics of a magnetic part having no superimposed direct current flowing therein, the magnetic part being made of one or more magnetic materials; and calculating a value of core loss of the magnetic part by multiplying the core loss characteristics by a rate of change of the core loss of the magnetic part caused by a superimposed direct current.

Abstract: The present disclosure relates to a system for monitoring a solenoid operated valve including at least one coil and at least one spool. The system compares a normalized current signature and a normalized current signature comparator to determine a spool fault condition.

Abstract: In described examples, a method of determining whether there is an open load fault in a test circuit includes closing a first switch to couple an input voltage to a first LC filter in which a first capacitor is coupled to a ground, the first LC filter coupled to a first terminal coupled to the test circuit; and closing a second switch to couple the input voltage to a second LC filter in which a second capacitor is coupled to the ground, the second LC filter coupled to a second terminal coupled to the test circuit. After the LC filters charge to the input voltage, the second switch is opened, and the second capacitor is discharged across a discharge resistor for a specified discharge time. The voltage across the discharge resistor falling below a reference voltage indicates that there is an open load fault in the test circuit.

Abstract: A control unit, controller and non-transitory machine-readable medium for detecting a closing time of an injector valve are disclosed. The control unit is configured to receive a valve current profile of the injector valve, process the valve current profile using at least a slope discriminator, and determine a stuck status and a closing time (if applicable) of the injector valve based on an output of the slope discriminator.

Abstract: According to one or more aspects, a health sense system for a pulse width modulation (PWM) device associated with a magnetic coil is provided, and includes a health sense circuit, a health logic circuit, and a counter circuit. The health sense circuit measures one or more current measurements at a low voltage side of the pulse width modulation device. The health logic circuit determines a health bit indicative of a health score for the magnetic coil of the pulse width modulation device based on one or more of the current measurements. The counter circuit generates a feedback command for the pulse width modulation device based on the health bit.

Abstract: Certain embodiments may generally relate to a smart fault detection device for power grids, and a method of fault detection for power grids. A method may include receiving raw data samples of currents in grounding conductors and line conductors. The method may also include processing the raw data samples under at least one of a plurality of system operating modes. The method may also include monitoring normal operation and anticipating an impending fault while operating under at least one of the system operating modes. The method may further include extracting fault information based on the monitoring. The method may also include reporting the fault information to a supervisory control and data acquisition system human-machine interface. The method may further include anticipating faults based on an analysis of the raw data samples.

Abstract: A failure judgment device of an automatic transmission includes: a first abnormality judging section configured to judge a power supply fault abnormality or a breaking abnormality of the solenoid, from a selected shift stage and a state of the transmission mechanism, after the detection of the electric abnormality; and a second abnormality judging section configured to judge the power supply abnormality or the breaking abnormality of the solenoid, from the monitor current value when the solenoid valve is switched to an OFF state, after the detection of the electric abnormality, when one of the first abnormality judging section and the second abnormality judging section judges the power supply fault abnormality or the breaking abnormality, the judgement result being outputted.

Abstract: A transformer winding fault diagnosis method based on wireless identification sensing includes the following steps: collecting transformer winding vibration signals in a normal state and when a fault occurs; denoising the transformer winding vibration signals by using singular entropy, and randomly dividing the denoised transformer winding vibration signals in the normal state into two groups, where one group is training data, and the other group is original measurement data; using the denoised transformer winding vibration signals obtained when the fault occurs as original threshold data; reconstructing the original threshold data to obtain reconstructed threshold data, and obtaining a transformer winding residual error threshold when the fault occurs; and reconstructing the original measurement data to obtain reconstructed measurement data, obtaining corresponding residual error data, and comparing the residual error data with the residual error threshold, to implement fault diagnosis on the transformer win

Abstract: A protection system capable of safely quenching a high temperature superconductor (HTS) magnet coil. The protection circuit provides for a frequency loss induced quench design that advances the protection technology for HTS magnet coils and provides a protection system that is capable of quickly distributing the heat energy uniformly in all the coil sections when a localized hot-spot is created.

Abstract: An apparatus and method for diagnosing the state of a power cable and measuring the remaining life thereof using VLF TD measurement data, and for determining a replacement time of a power cable using a 3D matrix exhibiting reproducibility of diagnosis of the state of the power cable. The apparatus and method for diagnosing the state of a power cable and measuring the remaining life thereof according to the present invention includes a Weibull modeling unit, a distance limiting unit, a data type classifying unit, a quantity representing unit, a normalization unit, a 3D constructing unit, a risk level calculating unit, and a remaining life measuring unit.

Abstract: A device for monitoring an operation of an inductive element, includes a current-measuring device is switched in series with the inductive element. The device is configured to ascertain a first time-discrete and value-discrete signal, which characterizes a current flowing through the current-measuring device; to ascertain a second time-discrete and value-discrete signal, which characterizes a current flowing through the current-measuring device and has a predefinable time shift in relation to the first signal; and to infer the presence of a shunt from a comparison of the first signal with the second signal. Also described is a method for monitoring the operation of the inductive element.

Abstract: Method and station for the construction of a stator winding with rigid bars for a rotary electrical machine; an insulated wire of electrically conductor material and provided on the outside with an insulating layer is unwound from a coil. A final end of the insulated wire is bent in a “U” shape so as to create a bar having two legs connected to one another by a cusp. The insulated wire is transversely cut to separate the rigid bar from the remaining part of the wire; and the bar is inserted into a stator slot of a magnetic core of a stator. The electrical conductivity is measured between the core and the outer surface of the insulated wire by means of a first electrode electrically and permanently connected to the core of the insulated wire and a second electrode, which rubs against the outer surface of the insulated wire.

Abstract: Surge testing systems and methods to surge test a device under test (DUT) in which a host computer controls a pulse generator and an oscilloscope to automatically apply a high voltage pulse from the pulse generator through a current limiter to the DUT, the oscilloscope provides one or more current or voltage waveforms representing a voltage or current associated with the DUT and/or the pulse generator, and the host computer determines a pass or fail condition of the DUT for the applied high voltage pulse according to the waveform or waveforms.

Abstract: A power conversion apparatus includes a pair of switching elements that are connected in series between a higher potential side terminal and a lower potential side terminal to form upper and lower arms; a coil whose end is connected between the pair of switching elements; and a controller that calculates, based on a voltage between the higher potential side terminal and the lower potential side terminal and an inductance of the coil, a time rate of change of a current value of a current flowing through the coil, and switches, based on the calculated time rate of change of the current value, between a single arm drive mode in which only one of the pair of switching elements is driven to be turned on/off and a double arm drive mode in which the pair of switching elements are driven to be turned on/off in opposite phase.

Abstract: A resolver abnormality detection apparatus for a resolver having first and second secondary windings includes a first resistor section including a first pull-up resistor for pulling up the first secondary winding, a first pull-down resistor for pulling down the first secondary winding, a second resistor section including a second pull-up resistor for pulling up the second secondary winding and a second pull-down resistor for pulling down the second secondary winding, and first and second differential input sections connected across the first secondary winding and across the second secondary winding, respectively. The resolver abnormality detection apparatus detects presence of an abnormality in each of the first and second secondary windings based on outputs of the first and second differential input sections, a DC voltage between the first resistor section and the first differential input section and a DC voltage between the second resistor section and the second differential input section.

Abstract: An EGR apparatus includes an EGR passage to allow part of exhaust gas discharged from a combustion chamber to flow in an intake passage and recirculate back to the combustion chamber and an EGR valve to regulate EGR gas in the EGR passage. The EGR valve includes a valve seat, a valve element, and a step motor. An ECU calculates a target correction value corresponding to an operating condition of an engine, cuts off energization to the step motor in order to hold the EGR valve at a predetermined opening degree during operation thereof, and then restarts energization to the step motor, calculates an energization cutoff correction value corresponding to an elapsed time from energization cutoff, and corrects the target correction value by the calculated energization cutoff correction value in order to control the EGR valve to the target opening degree.

Abstract: A device for detecting a quench in a superconducting coil according to one aspect of the invention includes a first superconducting coil and a second superconducting coil that are connected in series. The first superconducting coil and the second superconducting coil have the same shape. A first axis of the first superconducting coil and a second axis of the second superconducting coil are arranged at the same position and in the same direction, and the position of the first superconducting coil and the position of the second superconducting coil in the direction of the first and second axes are the same. The length of a winding wire of the first superconducting coil and the length of a winding wire of the second superconducting coil are equal to each other.

Abstract: A diagnosis system for monitoring a status of a switchboard is provided. The diagnosis system for monitoring a status of a switchboard includes a sensor unit installed in a switchboard, wherein the sensor unit comprise a plurality of sensors sensing two or more of a partial discharge (PD) signal, a temperature signal and an acc signal and outputting each switchboard status sensing signal; a data collecting device receiving each switchboard status sensing signal corresponding to two or more of the PD signal, the temperature signal, and the arc signal from the sensor unit wherein the data collecting device collects a plurality of datums for status monitoring and diagnosis control of the switchboard based on each switchboard status sensing signal received; and a remote monitoring device performing the status monitoring and diagnosis control of the switchboard based on a plurality of measuring datums received from the data collecting device.

Abstract: A method is disclosed for monitoring an opening of an injection valve. The injection valve includes a valve body with a cavity having a fluid outlet portion, a valve needle movable in the cavity between a closing position preventing fluid flow outlet and other positions allowing fluid flow through the outlet, and an actuator unit for actuating the valve needle. The method includes actuating the actuator unit with a predetermined voltage signal, recording a time-dependent profile of a current through the actuator unit, detecting a first gradient alteration time where the gradient of the recorded current profile changes more than a first threshold, detecting a second gradient alteration time where the gradient of the recorded current profile changes more than a second threshold, and based on the first and second gradient alteration times determining a diagnostic value usable for compensating a long-term drift of the injection valve.

Abstract: A method and apparatus for testing a transformer. A controller generates a switching signal and supplies the switching signal to a solid state switch in circuit with a test load of known magnitude, switching the solid state switch to place the test load in circuit with the transformer. A signal through or across the transformer is then measured. Methods and apparatus for testing a transformer comprise the controller and solid state switch placing a series of test loads of different known magnitudes in circuit with the transformer from the lowest magnitude to the highest, from the highest to the lowest, or both. Additionally, a test load array comprises a plurality of power resistors, a heat sink for accommodating the plurality of power resistors, and a material providing electrical insulation of the power resistors from the heat sink and thermal conductivity between the power resistors and the heat sink.

Abstract: For the purpose of determining a fault current component of a differential current which is measured as a current sum over a plurality of lines carrying a current of an AC current generator, an electric signal which depends on generator voltages present at the AC current generator with respect to earth potential and which is in phase with a leakage current component of the differential current is generated. The electric signal is scaled by multiplying it by a scaling factor; and the scaled electric signal is subtracted from the differential current to obtain a remainder. The scaling factor is repeatedly updated such that the effective value of the remainder reaches a minimum at the present value of the scaling factor.

Abstract: A method for manufacturing an electrochemical cell includes housing a main cell body in an outer packaging body of packaging material formed by laminating a metal foil layer and a heat-sealable resin layer, provided the tip ends of a first metal terminal and a second metal terminal are protruding outside the outer packaging body, heat-sealing a peripheral edge portion of the outer packaging body so the outer packaging body has the first and second terminals protruding; applying a voltage between the first terminal and the foil layer or between the second terminal and the foil layer; and inspecting for insulation failure from a short circuit between the first or second terminal and the foil layer or from a crack in the heat-sealable resin layer, based on a variation of a voltage held between the one of the metal terminals and the metal foil layer after halting the voltage.

Abstract: Various embodiments for determining a voltage rating of a solenoid in an electropneumatic valve are disclosed. A braking system controller comprises a power switch electrically connected to an associated first solenoid. The power switch provides a low current regulated voltage to the associated first solenoid. The current through the solenoid is converted to a voltage. The voltage is compared to a predetermined voltage range to determine the voltage rating of the associated first solenoid. In another embodiment, the control logic is capable of determining the voltage rating of multiple solenoids in each of the electropneumatic valves connected to the controller.

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: A device for monitoring an operation of an inductive element, includes a current-measuring device is switched in series with the inductive element. The device is configured to ascertain a first time-discrete and value-discrete signal, which characterizes a current flowing through the current-measuring device; to ascertain a second time-discrete and value-discrete signal, which characterizes a current flowing through the current-measuring device and has a predefinable time shift in relation to the first signal; and to infer the presence of a shunt from a comparison of the first signal with the second signal. Also described is a method for monitoring the operation of the inductive element.

Abstract: A circuit breaker is disclosed. A Rogowski converter is checked for wire breakage by applying a voltage to the Rogowski converter which is output by a digital/analog converter in response to a digital signal. The digital signal is dependent on the switch rated current of the circuit breaker.

Abstract: A position sensor that includes two coils, the first coil (transmitting coil) being fed a certain frequency such that it emits a constant electromagnetic field, and said field being received and/or detected by way of the second coil (receiving coil), is characterized in that the axis of the second coil is angled with respect to the axis of the first coil, preferably located at an angle of 90° with respect to the axis of the first coil.

Abstract: A monitoring system is configured to monitor electrical signals in an irrigation system. The monitoring system includes a memory and a detector coupled to an irrigation control line that is configured to provide control signals to an actuator within the irrigation system. The detector is configured to sense an electrical parameter of the control signals and to store data related to the electrical parameter in the memory.

Abstract: A voltage detector for detecting a voltage generated in a second resonant coil that is disposed to face a first resonant coil and that performs at least one of electric power transmission and electric power reception to and from the first resonant coil in a contactless manner by means of electromagnetic resonance includes: a first high-impedance element having one end connected to one end of the second resonant coil; a second high-impedance element having one end connected to the other end of the second resonant coil; a low-impedance element connected between the other end of the first high-impedance element and the other end of the second high-impedance element and having an impedance smaller than each of those of the first and second high-impedance elements; and an output terminal for outputting a signal associated with a voltage applied across the low-impedance element.

Abstract: Apparatus and method for partial discharge detection of turn-to-turn insulation in motor has a surge generator for generating a surge voltage to the windings of the motor by applying a pulse voltage, and a partial discharge current detector for detecting partial discharge currents between the winding turns of the motor. The surge generator generates in and between the windings of the motor the surge voltage that has the rise time and fall time corresponding to the rise time of the surge voltage observed at the motor terminal when the motor is driven by an inverter, and that is repeated at a frequency of 50 Hz to 20 kHz.

Abstract: The abnormality detection system is provided for detecting an abnormality of an object. The abnormality detection system includes a high-frequency power source, a primary coil, a secondary coil and a controller. The high-frequency power source supplies power. The primary coil receives the power supplied from the high-frequency power source. The secondary coil is mounted to the object in noncontact with the primary coil for receiving power supplied from the primary coil. The controller is operable to detect the power received by the secondary coil and also to determine whether or not an abnormality is present in the object based on the detected power.

Abstract: 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.

Abstract: A method of estimating stator resistance of an induction motor 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.

Abstract: An electrical machine configured to operate at a power range of several MVA includes a rotor is configured to rotate about a rotor axis. The rotor includes a rotor lamination stack. A stator includes a stator lamination stack concentrically surrounding the rotor lamination stack, wherein a ring-like air gap separates the rotor lamination stack from the stator. An air gap monitoring device extends through the air gap in an axial direction and is configured to detect at least one of a change in a rotor geometry and a presence of debris in the air gap.

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: A magnetic resonance coil testing arrangement includes an electric circuit for emulating an electrical load to a magnetic resonance coil. The electric circuit is configured to emulate an electrical load corresponding to an electrical load induced by organic tissue at the magnetic resonance frequency of the magnetic resonance coil.

Abstract: 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.

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: The electric machine comprises at least one winding made of a material having a temperature dependent resistance. The temperature of the winding is monitored using the resistance therein. Temperatures or resistances indicative of a fault can be sensed, and corrective action taken, without the need for dedicated temperature sensors.

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: An improved internturn short circuit detection device of transformer via differential voltage comprises a single-phase transformer (TM). The single-phase transformer (TM) comprises a high-voltage coil (K) and a low-voltage coil (N). A voltage transformer (PT) is positioned at the high voltage side of the single-phase transformer (TM). Two branches of a tap (K1) of the high-voltage coil (K) are connected with the input of a first converter (Q?), and a first voltage (U1?) is obtained. The secondary side of the voltage transformer (PT) is connected with the input of a second converter (Q), and a second voltage (U1) is obtained, and the first voltage (U1?) and the second voltage (U1) are compared, and when the voltage difference is above a predetermined primary threshold value, an interturn short circuit failure of the primary side is determined.

Abstract: A method enables adjustment of a current sense voltage for accurate measurement of an operating temperature for an electrical motor. The method includes identifying a DC input voltage to a motor winding and a duty cycle corresponding to the DC input voltage, the duty cycle being identified with reference to a linear relationship between two inverter loss factors established for different DC input voltages within a range of voltages for the DC input voltage. A voltage across the motor winding is identified with reference to the identified duty cycle, the identified voltage not including voltage dropped across an inverter used to apply the DC input voltage to the motor winding. The identified voltage across the motor winding is used to identify a resistance change for the motor winding.

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 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: 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: A discharge amount measuring device includes a power source, first and second sensors, a calibration wire, and a measuring portion. The power source applies a voltage to a coil of a rotational electric machine. The first sensor detects a current flowing through the coil. The calibration wire has an end connected to the coil. The second sensor detects a current flowing through the calibration wire. The measuring portion forms a calibration line based on a first waveform detected by the first sensor and a second waveform detected by the second sensor. The measuring portion calculates a discharge amount based on the calibration line.

Abstract: A voltage detector for detecting a voltage generated in a second resonant coil that is disposed to face a first resonant coil and that performs at least one of electric power transmission and electric power reception to and from the first resonant coil in a contactless manner by means of electromagnetic resonance includes: a first high-impedance element having one end connected to one end of the second resonant coil; a second high-impedance element having one end connected to the other end of the second resonant coil; a low-impedance element connected between the other end of the first high-impedance element and the other end of the second high-impedance element and having an impedance smaller than each of those of the first and second high-impedance elements; and an output terminal for outputting a signal associated with a voltage applied across the low-impedance element.

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.