Abstract: Examples include a method for determining a permanent magnet flux state of a rotor in a synchronous motor using a VSD. The method includes obtaining d-axis and q-axis inductance values of the motor, fixing a non-zero stator current magnitude and controlling a motor speed using a speed loop regulation in a stator current angle ? polar coordinate frame to reach a zero motor speed steady state corresponding to the fixed non-zero stator current magnitude, to the obtained d-axis and q-axis inductance values, and to a no-load situation. The method further includes recording coordinates of the reached steady state.

Abstract: Examples include a method for determining a static load torque at standstill applied to a salient pole synchronous motor. The method comprises fixing a first non-zero torque-producing current component and controlling motor speed using a speed loop regulation of a first regulated component to reach a first zero motor speed steady state corresponding to the fixed first non-zero current component, the motor being subjected to the specific static load torque. The method further comprises controlling motor speed using a speed loop regulation of a second regulated component to reach a second zero motor speed steady state corresponding to a fixed second non-zero torque-producing current component, the motor being subjected to the specific static load torque, the first non-zero current component and the second non-zero current component corresponding to different values. The load torque is estimated as a function of components of the first and second zero motor speed steady states.

Abstract: A harmonic filter including: a n-pulse transformer of a three-phase current, n being a multiple of 6; and n/6, or n/6-1, bridge rectifiers at the output of the n-pulse transformer.

Abstract: A method for determining a resonance frequency of a mechanical system including an electric motor coupled to a mechanical load. The method includes starting the motor by providing a supply voltage using a motor controller, and once the electric motor is running at a predefined target rotational speed, applying a first excitation signal comprising a voltage pulse superimposed to the supply voltage. The method further includes measuring a mechanical response of the mechanical system, using a measurement system coupled to the motor, and analyzing the measured response, to determine at least one resonance frequency of the mechanical system.

Abstract: Examples include a method for controlling a variable speed drive driving an electric motor. The variable speed drive is connected to an electric power source and comprises a passive DC-link and an inverter stage controlled by a first controller of the variable speed drive. The passive DC-link is connected to the inverter stage. The method comprises running the electric motor to reach a steady-state operating point, measuring a plurality of values of current or voltage of the passive DC-link, and computing, by a second controller, a frequency spectrum of the DC-link based on the plurality of values of current or voltage measured. The method further comprises detecting a specific resonance frequency by comparing amplitudes of the frequency spectrum to a predetermined pattern, and modifying filter parameters of a digital filter of the DC-link or control parameters of a control law of the electric motor based on the specific resonance frequency.

Abstract: A method for detecting a structural fault of an electric motor. The method includes: (i) acquiring a measurement signal of a physical parameter representative of the rotation of the electric motor, (ii) obtaining the high frequency component of the measurement signal, resulting in a corrected signal, (iii) applying a set of band-pass filters to the corrected signal resulting in a set of filtered corrected signals, (iv) determining a stator frequency and a rotor frequency, (v) computing a frequency signature vector, (vi) computing a temporal symptom vector from the frequency signature vector and the set of filtered corrected signals, and (vii) detecting a structural fault of the electric motor from the determined temporal symptom vector and from a classifier model.

Abstract: Examples include a method for controlling a synchronous motor using a variable speed drive. The motor includes a permanent magnet rotor generating a magnetic flux. The method includes applying a predefined electrical command signal to the motor and estimating a motor speed in response to the applying of the predefined electrical command signal. The method also includes reaching a desired estimated motor speed and, in response to reaching the desired estimated motor speed, estimating a parameter related to the magnetic flux of the permanent magnet rotor. The method further includes recording the estimated parameter.

Abstract: A variable speed drive includes an output terminal for delivering a drive voltage; a power inverter for generating the drive voltage; a drive controller for controlling the generation of the drive voltage; and a current sensor for providing a drive current intensity signal to the drive controller. The drive controller includes a PWM generator; a control law module; and a state variable estimator estimating a state variable of the controlled AC electric motor.

Abstract: A method for adapting a deceleration of a motor powered by a variable speed drive, the variable speed drive comprising a plurality of at least N low-voltage power cells linked in series, N being greater than or equal to 1, the method comprising the following operations during a period of deceleration of the motor: determination of at least one average motor voltage over a given period as a function of motor voltage values measured at the terminals of the motor over the given period; as a function of the determined average motor voltage, determination of an average rectified voltage value, wherein a rectified voltage corresponds to a voltage obtained at the output of a rectifier of each power cell; and adaptation of the deceleration of the electrical device as a function of the average rectified voltage value.

Abstract: Examples include a method for detecting the evolution of the magnetic state of a permanent magnet rotor. The method includes, during a first and a second time interval, applying a respective direct current command signal to the motor to estimate a respective stator resistance value, and applying a respective alternative voltage command signal corresponding to a specific direct axis stator current value to the motor while measuring respective stator phase current values. The method also includes determining respective rotor flux parameters as a function of the measured respective stator phase current values and of the estimated respective stator resistance values. The method further includes comparing the respective rotor flux parameters. The first and second time intervals are separated by a time period which exceeds at least 100 times any one of a first or second interval length.

Abstract: An apparatus for adapting an intelligent power module to a main circuit board of a motor controller, including: an adapter circuit board having fixed interface contact pins configured to be plugged into interface contact elements of the main circuit board of the motor controller, the power module having contact pins having a first pin out configuration connected on the adapter circuit board, wherein the adapter circuit board provides a cross pin configuration between the first pin out configuration of the power module and the interface contact pins having a second pin out configuration in order to connect the power module to the main circuit board, a set of capacitors connecting points on the adapter circuit board and capacitors connected to at least some of the capacitors connecting points and configured to reduce a radiated emission level of the motor controller, the capacitance of the capacitors being designed to reach a target threshold for the radiated emission level of the motor controller.

Abstract: Examples include a method of control implemented in a variable speed drive for controlling an electric motor during backspin, wherein the method includes: determining, by the variable speed drive, a mechanical power value occurring at a backspin speed and an estimated load torque; determining, by the variable speed drive, a specific electrical losses profile occurring at a motor flux level, wherein the specific electrical losses profile coincides with the mechanical power value; determining, by the variable speed drive, a flux reference and a speed reference to be applied to the motor to coincide with the specific electrical losses profile; and controlling, by the variable speed drive, the backspin speed of the motor to maintain the coincidence with the specific electrical losses profile.

Abstract: A diagnostic process for a cabling of a three phase motor in a “delta-inside” configuration with a soft starter to a three phases power supply including, after cabling a soft starter with the thyristor outputs of the soft starter to the motor windings inputs, cabling the motor windings outputs to the main phases and powering the power supply or prior to startup of the motor, at least a test process including: measuring with voltage sensors connected to the Mains inputs, voltage sensors connected to the motor outputs of the thyristors of the soft starter and observer functions within the soft starter the frequency, voltage and phase angle of the Mains and motor lines in order to compare such voltages and phases without triggering the thyristors; calculating the differential angle ?? between the motor electric rotation angle ?M and the Mains rotation angle ?A; comparing the calculated differential angle ?? with known differential angles corresponding to a correct cabling differential angle and faulty cablings d

Abstract: A method for monitoring operation status of an electric motor in real time, including: reading a drive application signal of the electric motor; selecting a frequency to be observed; analyzing the frequency to be observed to obtain a spectrum thereof; analyzing the spectrum; and detecting the operation status of the electric motor on the basis of the spectrum analysis.

Abstract: A method of setting up an electrical motor speed control in a fluidic system including a turbomachine, an electric motor having a number p of pole pairs rotating the turbomachine, a variable speed drive controlling the speed of the electric motor, a sensor measuring a parameter H, Q of the turbomachine, and a system controller receiving the sensor's measurements and controlling the operation of the fluidic system.

Abstract: Examples include a method for controlling an electric motor using a variable speed drive based on input parameters of the variable speed drive. The method uses initial estimated parameters of an electric motor and measurements of the variable speed drive at operating points of the electric motor to determine accurate input parameters of the variable speed drive.

Abstract: A method for sensorless control of an electric motor implemented in a variable speed drive including: determining a control voltage to be applied to the motor; injecting a high frequency signal to the control voltage to obtain an excitation voltage, wherein one or more frequencies of the high frequency signal varies with time; applying the excitation voltage to the motor; measuring a current signal induced in the motor by the excitation voltage, wherein the current signal comprises a fundamental current, induced by the control voltage, and a disturbance current, induced by the high frequency signal; and demodulating the current signal.

Abstract: Examples include a method for controlling a variable speed drive driving an electric motor. The variable speed drive is connected to an electric power source and comprises a passive DC-link and an inverter stage controlled by a first controller of the variable speed drive. The passive DC-link is connected to the inverter stage. The method comprises running the electric motor to reach a steady-state operating point, measuring a plurality of values of current or voltage of the passive DC-link, and computing, by a second controller, a frequency spectrum of the DC-link based on the plurality of values of current or voltage measured. The method further comprises detecting a specific resonance frequency by comparing amplitudes of the frequency spectrum to a predetermined pattern, and modifying filter parameters of a digital filter of the DC-link or control parameters of a control law of the electric motor based on the specific resonance frequency.

Abstract: A method for controlling a variable speed drive supplying power to an electric motor, the variable speed drive comprising a plurality of at least Ni low-voltage power cells connected in series, comprising: upon reception of a speed command, determining a number Mi of cells sufficient to supply power to the motor at a target voltage V that is determined based on the speed command; and activating the Mi power cells from among the Ni power cells, and deactivating the Ni-Mi other power cells in order to supply power to the motor in accordance with the speed command.

Abstract: An electronic determination device for determining at least one characteristic parameter of a connection set connected between a converter and an electric machine; the converter comprising at least two output terminals and, for each output terminal, a switching branch including at least one converter switch; the connection set comprising a filter connected to the output terminals and a cable connected between the filter and the electric machine; the filter including, for each output terminal, a respective electromagnetic coil connected to said output terminal and a respective capacitor connected to said coil; the determination device comprising: for each output terminal, a device switch configured to be connected to the respective capacitor; a generation module configured to generate a voltage pulse through the connection set, by controlling the converter switches and each device switch; an acquisition module configured to acquire measurements of respective current(s) and voltage(s) through the filter, fur