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 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: 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: 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 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 generating a current set point value for a charging device connected to an electrical network includes measuring at least one electrical voltage, calculating a filtered voltage according to the measured voltage and a value of electrical pulsation of the electrical network, estimating a frequency and the amplitude of the measured voltage according to the at least one measured voltage and the at least one filtered voltage, calculating a consolidated voltage according to the measured voltage and the filtered voltage, and generating a current set point value according to the consolidated voltage and the estimated amplitude.

Abstract: The disclosure relates to a method for controlling a synchronous three-phase electrical machine having a stator and a rotor. The method may include measuring currents of the first and second phases of the stator. The method may include measuring an angular position of the rotor. The method may include calculating the currents measured in a rotor reference frame. The method may include measuring the rotor current. The method may include calculating an automatic control error. The method may include calculating control voltages for the electrical machine. The method may further include applying the control voltages to said electrical machine. According to the disclosed method, the control voltages are calculated in the rotor reference frame in a recursive manner and as a function of a command update period value, a DC voltage value, and the angular electrical speed of the rotor.

Abstract: A method for generating a current set point value for a charging device connected to an electrical network includes measuring at least one electrical voltage, calculating a filtered voltage according to the measured voltage and a value of electrical pulsation of the electrical network, estimating a frequency and the amplitude of the measured voltage according to the at least one measured voltage and the at least one filtered voltage, calculating a consolidated voltage according to the measured voltage and the filtered voltage, and generating a current set point value according to the consolidated voltage and the estimated amplitude.

Abstract: A method for determining a resonance frequency of a mechanical system including an electric motor coupled to a mechanical load, the method including: starting the motor by providing a supply voltage using a motor controller; 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; 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: The disclosure relates to a method for controlling a synchronous three-phase electrical machine having a stator and a rotor. The method may include measuring currents of the first and second phases of the stator. The method may include measuring an angular position of the rotor. The method may include calculating the currents measured in a rotor reference frame. The method may include measuring the rotor current. The method may include calculating an automatic control error. The method may include calculating control voltages for the electrical machine. The method may further include applying the control voltages to said electrical machine. According to the disclosed method, the control voltages are calculated in the rotor reference frame in a recursive manner and as a function of a command update period value, a DC voltage value, and the angular electrical speed of the rotor.

Abstract: A method estimating position and speed of a rotor of an alternating current machine for a motor vehicle.

Abstract: A method estimating position and speed of a rotor of an alternating current machine for a motor vehicle.

Abstract: A method for controlling a synchronous electric machine with a wound rotor for an electric or hybrid motor vehicle includes measuring the rotor and stator phase currents and voltages in the three-phase reference frame and determining the rotor and stator phase currents and voltages in the two-phase reference frame according to the measurements of current and voltage in the three-phase reference frame. The method also includes determining the position and the speed of the rotor in relation to the stator by an observer according to the stator and rotor voltages and currents expressed in the two-phase reference frame, and the observer is regulated by a discrete extended Kalman algorithm.