Newport Corporation

Valeo Electronique

Institut Francais Du Pe'trole

Skf Magnetic Mechatronics

Jean Levine

Roger Desailly

Joaquim Da Silva

Pascal Bonduel

Yann Creff

Salim Benbouzid

Daniel Gvero

Cédric Le Cunff

Francis Biolley

Franck Duquenoy

Serge Maneuf

Stephane Marie Turpault

Claude Putot

Jeremy Malaize

Frederic Bessiere

Van Di&ecirc;p Nguyen

Van Diep Nguyen

Rida Sabri

Stéphane Turpault

A control device for controlling the position of a rotor supported by active magnetic bearings is provided. The control device includes a trajectory planning module for generating a requested position, speed and acceleration; a feedback unit for generating a position feedback value and a speed feedback value; a first correction circuit for generating a first command signal according to the difference between the requested position and speed and the position and speed feedback value respectively; a feed-forward controller for generating a second command signal; an adder for adding first and second command signals and delivering a third command signal for a non-linear inversion circuit connected to the adder for generating flux command signals for the electromagnets, and a second correction circuit for generating voltage command signals for the power amplifiers which control the current flowing in the electromagnet coils of the active magnetic bearings.

Active magnetic bearings control system

An apparatus comprises a brushless motor, driver, incremental displacement sensor, and processor. The motor has a rotor, stator, and electrical terminals accepting a drive signal. The initial phase of the rotor is unknown. The driver is connected to the electrical terminals and produces the drive signal. The displacement sensor is configured to measure a displacement of the rotor and to produce an output signal. The processor has an input receiving the output signal and an output connected to the driver. The processor causes the driver to produce the drive signal according to a predetermined function of time, observes the output signal from the displacement sensor resulting from the drive signal, and performs mathematical computations on the basis of the observed output signal and a model of dynamic behavior of the motor to estimate the initial phase of the rotor.

Apparatus and method for estimation of initial phase of a brushless motor

Method intended for automatic control of an underwater pipe for connecting the lower end of the pipe to a wellhead, wherein the following stages are carried out:

Automatic control methods for positioning the lower end of a filiform structure, notably an oil pipe, at sea

A Process and device for displacing a moveable unit on a base. The process includes: a) a force (F) is determined which, applied to the moveable unit (), produces a combined effect, on the one hand, on the moveable unit () so that it exactly carries out the envisaged displacement on the base (), especially as regards the prescribed duration and prescribed distance of the displacement, and, on the other hand, on the elements (MA, MAMA) brought into motion by this displacement so that all these elements are immobile at the end of said displacement of the moveable unit (); and b) the force (F) thus determined is applied to the moveable unit ().

Process and device for displacing a moveable unit on a base

A process for monitoring the rotation of a DC electric motor, wherein the voltage and the intensity of the current supplying the motor are measured in a manner sampled over time and wherein, for each sampling instant t , an estimate &thgr; , of the angular position is calculated as a function of a determined or known position for a previous sampling instant and of an estimate of a value of angular speed between these two instants, which is dependent on the voltage and on the intensity of current measured for the sampling instant t , and/or for one or more previous sampling instants.

Processes and devices for monitoring the rotation of DC electric motors

Method and device for displacing a moving body on a base mounted elastically with respect to the ground

Apparatus for controlling a system, such as a vehicle screen

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Paris, France

Jean Levine