A method for monitoring the operation of an electrical assembly having a plurality of coils disposed electrically in a parallel circuit, includes detecting, off-power, the voltage at each coil by using a tap on a winding, determining the AC component of the detected voltage for each coil, determining the mean value of the voltage at the coils, evaluating the determined AC component for each coil with respect to the determined mean voltage, while applying a weighting, and generating a signal if a weighted deviation of a value describing the AC component of a detected voltage in a coil from a value describing the mean voltage exceeds a specified limiting value. An electrical assembly and a method for operating the assembly are also provided.

A method carries out a self-test of an electrical converter circuit, by use of a control device, proceeding from a known operating point at which a predetermined electrical operating variable has a predetermined starting value, a measurement cycle is begun by the converter circuit being operated. It is additionally provided that the time since the starting of the measurement cycle is detected, and the electrical operating variable and the time constitute two monitoring variables of the self-test. The measurement cycle is ended if one of the two monitoring variables satisfies an ending criterion. A test value is then formed from a measurement value of the other of the two monitoring variables at the end of the measurement cycle and a check is made to ascertain whether the test value lies outside a predetermined reference interval. If so an error signal is generated.

A method checks the plausibility of a measurement of an actuator current by use of an actuator two-terminal network. The actuator two-terminal network contains an inductive load and a resistive load. A first pole of the actuator two-terminal network is connected to a supply voltage via a pulse-width-modulated switch and is connected to earth via a freewheeling diode arranged in the reverse direction, and wherein a second pole of the actuator two-terminal network is connected to earth.

A hairpin type stator inspection apparatus is provided for testing performance of a stator wound with hairpin type stator coils. The hairpin type stator inspection apparatus includes: a conveyor provided on a frame for transferring the stator including a plurality of stator terminals along a predetermined path: a plurality of clamp terminals, which are installed to be movable to the frame by a driver in up and down, front and rear, and left and right directions in order to clamp the stator terminals: a controller that applies a driving control signal to the driver to change a position of the clamp terminals according to a position of the stator terminals; and an inspection portion that applies power to the stator terminals through the clamp terminals and inspects the electrical circuit of the stator.

Arrangement of interleaved secondary windings for power transformers that reduces the thickness of secondary windings and allows to build transformers with an odd number of layers

A method is provided for detecting an anomalous frequency response analysis (FRA) test of a transformer. The method uses frequency response analysis to measure voltage amplitudes and frequencies in one winding of the transformer which result from an AC voltage applied to another winding of the transformer. Two statistical distributions are generated from the measured data and the statistical distributions are combined such that one distribution defines one axis, the other distribution defines another axis, and the probabilities of the distributions defines another axis.

Provided are embodiments for determining solenoid plunger position by performing a method which includes generating, by a first signal circuit, a first signal based at least in part on a pull-in current value of a current applied to a solenoid coil of a solenoid. The method further includes generating, by a second signal circuit, a second signal by applying a time delay to the first signal. The method further includes comparing, by a comparator circuit, the first signal and the second signal to determine whether a plunger of the solenoid has moved within the solenoid from a first position to a second position. The method further includes, responsive to determining that the plunger of the solenoid has moved within the solenoid from the first position to the second position, reducing the current applied to the solenoid coil of the solenoid from the pull-in current value to a hold current value.

Provided are embodiments for determining solenoid plunger position by performing a method which includes generating, by a first signal circuit, a first signal based at least in part on a pull-in current value of a current applied to a solenoid coil of a solenoid. The method further includes generating, by a second signal circuit, a second signal by applying a time delay to the first signal. The method further includes comparing, by a comparator circuit, the first signal and the second signal to determine whether a plunger of the solenoid has moved within the solenoid from a first position to a second position. The method further includes, responsive to determining that the plunger of the solenoid has moved within the solenoid from the first position to the second position, reducing the current applied to the solenoid coil of the solenoid from the pull-in current value to a hold current value.

The disclosure relates to a fault detection method for a Buck converter based on an inverse Kalman filter, which belongs to the field of fault detection for power converters. The method includes: establishing a hybrid discrete model of a non-ideal Buck converter in Continuous Conduction Mode (CCM); acquiring a state equation and an observation equation of the Buck converter; acquiring the input voltage, the switching state, the inductive current and the output voltage in a working state, and determining the state matrix of the Buck converter; estimating a parameter matrix at time k according to the state matrix, the state equation and the observation equation; determining an estimated value of each component according to the estimated parameter matrix of the Buck converter at time k; and determining whether the Buck converter is faulty or not according to the estimated value of each component. The problems of poor real-time performance and low accuracy of fault diagnosis for the Buck converter at present are solved, and the real-time performance and accuracy of fault detection for the Buck converter are improved.

The disclosure relates to a fault detection method for a Buck converter based on an inverse Kalman filter, which belongs to the field of fault detection for power converters. The method includes: establishing a hybrid discrete model of a non-ideal Buck converter in Continuous Conduction Mode (CCM); acquiring a state equation and an observation equation of the Buck converter; acquiring the input voltage, the switching state, the inductive current and the output voltage in a working state, and determining the state matrix of the Buck converter; estimating a parameter matrix at time k according to the state matrix, the state equation and the observation equation; determining an estimated value of each component according to the estimated parameter matrix of the Buck converter at time k; and determining whether the Buck converter is faulty or not according to the estimated value of each component. The problems of poor real-time performance and low accuracy of fault diagnosis for the Buck converter at present are solved, and the real-time performance and accuracy of fault detection for the Buck converter are improved.