Schneider Toshiba Inverter Europe Sas

François Malrait

Thomas Devos

Al Kassem Jebai

Pierre Rouchon

Philippe Martin

Rudolf Fehringer

Stefan Capitaneanu

Mehdi Messaoudi

Fabrice Jadot

Alain Dutrey

Rodolphe Sepulchre

Ludovic Kermarrec

Emmanuel Frappe

Marc Geneau

Michael Hernandez

Philippe Le Goualec

Patrice Ruault

Quentin Delafontaine

Kamal Ejjabraoui

Duro c/o Schneider Electric Industries Sas Service Proprité Industrielle Basic

Stéfan Capitaneanu

Duro Basic

Examples include a method for controlling a motor soft-starter for starting an electric motor on a three-phases electric network in order to compensate a misbalance between the windings of the electric motor due to a misbalance between the phases of the electric network.

Motor soft-starter control

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.

Magnetic flux estimate

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:

Adapting the deceleration of a motor as a function of an average rectified voltage

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.

Backspinning motor control

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:

Management of the number of active power cells of a variable speed drive

A method for controlling an electrical motor taking in account slip frequency. The method including determining amplitude, phase and frequency of the stator voltage from voltage measurements, determining estimates for current components from current measurement and stator voltage phase, determining estimate for torque from voltage amplitude, frequency, current amplitude and motor data, determining estimate for speed from torque, frequency and motor data, and determining over-estimation of speed from speed estimate, torque estimate and slip frequency. The over-estimation may be used to improve functional safety of the motor.

Method for estimating mechanical parameters of an electrical motor

An electronic determination device is configured for determining at least one characteristic parameter of an electric machine with P phases, P&#x2265;3, connected to an electric starter and including at least P-1 switching arms, each switching arm being connected to a respective phase of the electric machine. The determination device comprises a control module configured to control respective switching arm(s) to close and the other switching arm(s) to open, so as to generate a current injection on two phases of the electric machine; an acquisition module configured to acquire measurements of respective current(s) and voltage(s) for said two phases, further to the generation of the current injection; and a calculation module configured to calculate at least one characteristic parameter of the electric machine according to the respective current(s) and voltage(s) measurements.

Electronic device and method for determining at least one characteristic parameter of an electric machine connected to an electric starter, related power supply chain and computer program

A method for controlling a variable speed drive comprising Ni low-voltage power cells connected in series for each phase among multiple phases, i being a phase index. The method comprises repeating P iterations comprising: activating at least one cell of one or more phases and deactivating the other power cells of the variable speed drive, wherein the at least one activated cell is selected on the basis of predefined activation controls depending on an iteration index; and receiving at least one output voltage of the variable speed drive across the terminals of the electrical device for at least one phase. The method further comprises, at the end of the P iterations, determining, from the measured output voltages, values of rectified voltage at the output of respective rectification stages of the power cells, and storing the rectified voltages obtained, which are respectively associated with the power cells.

Control of power cells of a variable speed drive on the basis of rectified voltages

A method for controlling a variable speed drive arranged for powering an electric motor, the variable speed drive comprising a power part and a control part. The method comprises a preliminary phase of storing a set of predetermined levels of flux of the electric motor. Then, during a current phase, the method comprises selecting a level of flux from among the set of predetermined levels of flux and controlling the power part of the variable speed drive based on the selected level of flux as reference value.

Control of a power part of a variable speed drive based on predetermined levels of flux

A method for configuring a variable speed drive in charge of power supply of an electric motor. The method comprises the application of a sequence of motor voltages to the electric motor by the variable speed drive and the obtaining, in parallel, of measurements of motor current. The method then determines a feature of the electric motor on the basis of the measurements of motor current and determines a type of electric motor at least as a function of the feature. The variable speed drive is then set up on the basis of the determined type of electric motor.

Detection of the type of an electric motor for the configuration of a variable speed drive

A method for connecting a second motor to a variable speed drive in parallel with at least one existing motor under load and controlled by the variable speed drive is provided. The method disconnects the existing motor from the variable speed drive and a state estimator calculates transient state of the existing motor including at least the speed of the existing motor based on a previously established load model. The method then connects the second motor to the variable speed drive and the second motor is operated using a suitable directive until the actual state of the second motor attains the calculated transient state of the existing motor at a given time. Upon attaining the calculated transient state, the existing motor is reconnected to the variable speed drive such that no current spike is generated in the aforementioned process.

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Jouy sur Eure, France

François Malrait