The subject of the invention is a method and a device for determination of a torsional deflection of a rotation shaft in the electromechanical drivetrain. The method uses a current and a voltage signals measurement of the driving electrical machine and an angular speed measurement of the shaft of the drivetrain and includes the step of measuring of a voltage U.sub.DC of the DC link unit of a converter; the step of calculating a value of a load torque T.sub.load of the driving electrical machine; the step of detecting of an oscillation O.sub.SC(T.sub.load) in the load torque T.sub.load and calculation magnitudes of characteristic frequencies of Fast Fourier Transform FFT(U.sub.DC) of the voltage U.sub.DC of DC link unit; the step of determining of a timestamp indicators t.sub.Tload for oscillations O.sub.SC(T.sub.load) and t.sub.FFT of U.sub.DC for magnitudes of characteristic frequencies of FFT(U.sub.DC) of the voltage U.sub.DC of DC link unit; the step of comparing the value of the timestamp indicators t.sub.Tload and t.sub.FFT and determining a torsional deflection of the rotation shaft if t.sub.Tload<t.sub.FFT; the step of presenting the result of the comparison to the user in a diagnostic unit.

A method and device of determining a fault condition in a synchronous motor including a rotor provided with damper bars and an end ring to which the damper bars are mechanically connected thereby forming a damper cage, wherein the method includes: obtaining a first measurement of an end ring current from a first location along the end ring, processing the first measurement to thereby obtain a processing result, and determining whether a fault condition is present in the synchronous motor based on the processing result.

A method and device of determining a fault condition in a synchronous motor including a rotor provided with damper bars and an end ring to which the damper bars are mechanically connected thereby forming a damper cage, wherein the method includes: obtaining a first measurement of an end ring current from a first location along the end ring, processing the first measurement to thereby obtain a processing result, and determining whether a fault condition is present in the synchronous motor based on the processing result.

A system is provided including a current sensor arranged to sense current drawn by an electric motor of a powered device through an AC power line from a power supply and provide current data related to the powered device; a monitoring device arranged to receive the current data from the electrical sensor, the monitoring device including a controller processing the current data to obtain performance data associated with the powered device, the performance data relating to load applied to the electric motor; a data communication device communicating with the monitoring device and arranged to receive the performance data associated with the powered device; and a computing device including a graphical user interface, the computer device receiving a user's selection of the powered device from a list of powered devices and presenting the performance data to the user via the graphical user interface in response to the user's selection.

Conformance testing of a rebuilt motor includes disposing a motor under test in a motor test stand, coupling a plurality of sensors to the motor under test including a first vibrational sensor to the motor under test; a first temperature sensor to the motor under test; a first rotational speed sensor to the motor under test. A set of test parameters are received comprising parameters for a conformance test, the test parameters including a vibrational sensor parameter, a temperature sensor parameter, and a rotational speed parameter. A motor under test is placed in an on-state and a processing device receives sensor data simultaneously from the sensors, determines that the rotational speed satisfies the rotational speed parameter, and stores time sampled sensor data received from the plurality of sensors relative to a time zero corresponding to a time when the rotational speed satisfies the rotational speed.

An information handling system includes an air mover and a thermal manager. The thermal manager identifies an air mover identification event for the air mover; in response to identifying the air mover identification event: places the air mover in a type identification state, and while the air mover is in the type identification state, identifies a type of the air mover; and, after identifying the type of the air mover, places the air mover in an active state based on the type of the air mover.

An information handling system includes an air mover and a thermal manager. The thermal manager identifies an air mover identification event for the air mover; in response to identifying the air mover identification event: places the air mover in a type identification state, and while the air mover is in the type identification state, identifies a type of the air mover; and, after identifying the type of the air mover, places the air mover in an active state based on the type of the air mover.

A method and device estimate life consumption for an electronic component for use with an electric motor. The method and device allow maximal/minimal temperature values of semiconductor devices to be continuously monitored to allow on-cycle thermal damage and post-cycle damage to be determined in a parallel manner.

Provided are a short circuit state analyzer to compare difference value when the AC excitation current is applied at a first frequency with a threshold value, to estimate a short circuit resistance from the difference value based on data indicating a relationship between the short circuit resistance and the difference value at the first frequency when the difference value is smaller than the threshold value, to cause an excitation power supply to apply the AC excitation current to the field windings at a second frequency lower than the first frequency when the difference value is equal to or greater than the threshold value, and to estimate the short circuit resistance from a difference value obtained by the AC excitation current at the second frequency based on data indicating a relationship between the short circuit resistance and the difference value at the second frequency.

Disclosed is a traction battery self-heating control method and a device. Acquiring a second temperature of a rotor at a current sampling time according to system parameters and a first temperature of the rotor at a previous sampling time, and estimating a third temperature of the rotor at a next sampling time according to the first temperature and the second temperature, and stopping the self-heating of the traction battery when the third temperature reaches a demagnetization temperature of the rotor. Whether to stop the self-heating of the traction battery is determined by estimating a rotor temperature under the self-heating condition, and comparing the rotor temperature with the demagnetization temperature of the rotor, and thus the self-heating control of the traction battery is realized.