Skf Magnetic Mechatronics

Hitachi Computer Products (europe) S.a.s.

Hitachi Computer Product (europe) S.a.s.

Skf Magnetic Mechatronics S.a.s.

Joaquim Da Silva

Claude Launay

Florent Voisin

Shunji Maeda

Takanori Ninomiya

Lakdar Sadi-Haddad

Erwan Salahun

Tomoaki Hirai

Lateb Ramdane

Bruno Tellier

Yves Dupuis

Salim Benbouzid

Olivier Lemarchand

Joel Mouterde

Ulrich Schroeder

Frederic Ponson

Jean Levine

Jens Anders

Mohamed Bendaoud

Frédéric Ponson

Eric Helene

Stephane Marie Turpault

Matthieu Oliva

Pascal Jordana

Andre Deandrade

Daniel Le Reste

William Pancirol

Gregory Cossart

Philippe Parbaud

Stéphane Turpault

Grégory Cossart

Ramdane Lateb

Ramdane Lates

Rotating machine vibration monitoring process for detecting degradations within a rotating machine providing an output axle fitted with magnetic bearings, the magnetic bearings having at least a position sensor and at least a magnetic actuator, the process provides the following steps: 1) defining a set of excitations that does not destabilizes the rotating machine, 2) injecting the set of excitations in the rotating machine through the magnetic actuators and 3) measuring the response of the rotating machine checking whether the response verifies at least one predefined criterium, 4) if it is not the case, adjusting the properties of the set of excitations and resuming the process at the injection step, 5) if the response verifies the at least one criterium, determining at least one condition indicator based on the response measured, 6) determining if an alarm is to be triggered based on the condition indicator determined.

Rotating machine vibration monitoring process for detecting degradations within a rotating machine fitted with magnetic bearings

A lamination stack for use in a rotating electrical machine includes a plurality of sheets of ferritic material. Each of the sheets has first and second sides that include asperities, and the asperities have a height of about two microns and a width of about two microns. A layer of electrically insulating material is provided between adjacent pairs of the ferritic sheets in the stack, and the asperities extend into the electrically insulating material.

Lamination stack for use in an electrical machine

A system for compensating for the stresses applied to a bearing that rotatably supports a rotor shaft of a rotating machine relative to a stator of the machine. The system provides at least one sensor for measuring an input signal positioned on an element of the bearing, a module for acquiring the input signal configured to convert the input signal into a value of the deformation applied to the rolling bearing, a module for determining a compensation signal as a function of the deformation value, and an amplifier module configured to control a magnetic actuator rotatably supporting the shaft of the rotor and including at least one electromagnet, the amplifier module being configured to convert the compensation signal into a voltage signal transmitted to the electromagnet of the magnetic actuator, the magnetic actuator being configured to exert a force on the rotor shaft as a function of the voltage signal.

System for compensating for the stresses applied to a bearing supporting a rotor shaft of a rotating machine

The invention relates to a method of manufacturing a lamination stack used in a rotating electrical machine. The method includes providing naked sheets made of ferritic material; preparing both sides of each sheet so as to obtain a determined surface roughness; coating at least one side of each sheet with an chemically protective electrically insulating material; stacking the coated sheets; compressing the stack obtained; heating the compressed stack at a temperature above the melting temperature of the insulating material; and cooling down the compressed stack so as to form an integral lamination stack consisting of alternating sheets of ferritic material and layers of insulating material. The invention also relates to an electrical machine comprising such a lamination stack.

Method of manufacturing a lamination stack for use in an electrical machine

A radial position sensor that measures a radial position of a rotor within a stator is provided. The radial position sensor provides measures the radial position of the rotor along a first axis radial to a rotation axis of the rotor and along a second axis perpendicular to the first axis. The radial position sensor includes four magnetic poles, among which two poles are diametrically opposed along the first axis and two other poles are diametrically opposed along the second axis.

Radial position sensor

The invention concerns an electrical installation providing an apparatus, a three-phase inverter and a control device, the inverter being adapted for generating a three-phase current presenting a first frequency for operating the apparatus and an undesired frequency component presenting a second frequency. The control device is adapted for measuring a parameter of each phase of the current, the measured parameters forming a measurement vector, and for calculating a Clarke transform, providing a first vector represented in a first basis of a two-dimensional vector space, of the measurement vector. The control device is adapted for generating a representation of the first vector in a second basis of the vector space, the second basis rotating at the second frequency with respect to the first basis.

Electrical installation comprising an electrical apparatus, a three-phase inverter and a control device for controlling the inverter, and related method

An electronic magnetic bearing controller for controlling the position of a rotor of an electrical machine supported by an active magnetic bearing the position of which being measured by at least one inductive position sensor having an inductive coil, comprising an automatic reactive power compensation device for automatically compensating the reactive power consumed by the inductive position sensor.

Electronic magnetic bearing controller with an automatic reactive power compensation device

A hybrid magnetic suspension of a rotor () having compressor wheels () having permanent magnets () integral to shrunk fit rings () arranged on the rotor () in the vicinity of the compressor wheels (), permanent magnets () integral to stationary rings () coaxially arranged with the rotor () and associated with a resilient material () to define a passive radial magnetic bearing, coils () associated with magnetic armatures () and facing rotor parts () being located perpendicularly to the rotor (), and axial sensors () configured for sensing the axial position of the rotor () and control means () configured for feeding the coils () as a function of the outputs of the axial sensors () for generating both axial bearing forces and a motor torque and thereby being adapted for defining an axial bearingless motor.

Hybrid magnetic suspension of a rotor

A permanent magnet rotor shaft assembly for a high speed electrical machine provides a permanent magnet cylindrical core having a longitudinal axis, the cylindrical core being axially compressed by first and second end shafts and being radially compressed by a sleeve made of a non-magnetic high strength metal. At least one of the first and second end shafts includes, facing the cylindrical core, a central shoulder head that cooperates with a mating central recess made in a central portion of a front face of the cylindrical core. An easy concentric alignment of the first and second end shafts with the permanent magnet cylindrical core is allowed while inserting the sleeve and the stiffness of the assembled set is enhanced.

Permanent magnet rotor shaft assembly and method

An assembly includes a rotating shaft supported with respect to a stationary housing by at least one active magnetic bearing presenting a mean radial air gap and at least one auxiliary bearing having first and second coaxially arranged annular surfaces is provided. One of the first and second coaxially arranged annular surfaces defines a clearance (E) with one of the stationary housing and the rotating shaft, the clearance (E) being less than the mean radial air gap and the other of the first and second coaxially arranged annular surfaces being integral with the other one of the stationary housing and the rotating shaft. The auxiliary bearing provides a first ball bearing and a second ball bearing having a misalignment with respect to each other in order to increase the starting torque.

Auxiliary bearing of the ball bearing type for a magnetically suspended rotor system

A digital nonlinear corrector of an active magnetic bearing receiving an input signal x(t) and outputting an output control signal u(t) for controlling the position of said active magnetic bearing, the input signal being digitalized by a ADC circuit and provided to an adder, the digital nonlinear corrector comprising a closed control loop delivering an intermediary sequence of numbers y[kT] and having a direct branch comprising a first proportional gain circuit and a feedback branch comprising a series connection of a low-pass filter and a dead zone circuit, such that said low-pass filter is activated when determined upper and lower values of said output control signal are reached, the output control signal reproducing the input signal when these determined upper and lower values are not reached.

Digital nonlinear corrector for active magnetic bearings

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

A detection assembly for detecting a morphology of a person is provided. The assembly includes a sensor and a processing unit. The sensor includes (i) first and second main linear electrodes covering different zones of a plane, and (ii) a third auxiliary linear electrode having substantially at least an open loop shape and almost entirely surrounding the first and second main electrodes in said plane. The processing unit is connected to the electrodes and is for (i) powering the electrodes at controlled voltage levels, (ii) making use of signals taken from the electrodes in the form of ratios between two of the signals, and (iii) delivering binary signals representing a percentage by which a main electrode is covered by comparison of a signal taken from the main electrodes with a predetermined threshold, and analog signals representing a percentage of covering of at least one electrode.

Capacitive sensor for morphological discrimination of a motor vehicle seat occupant

The present invention relates to a method determining the morphology of the occupant of an automotive car, characterized in that it comprises the steps of collecting () the outputs of a plurality of capacitive sensors () provided on a seat, determining for each capacitive sensors () a first value representative of the distance (di) separating a target () from the sensor () and a second value (Sdi) representative of the surface of the sensor () covered by the target (), applying () to the second values (Sdi) representative of the surface of the sensor () covered by the target () a respective weighting (Wi) based on the corresponding first value (di) representative of the distance separating the target () from the same sensor (), and determining () the morphology of the target () on the basis of the collection of weighted second values (SdixWi).

Method for determining the morphology of an occupant in an automotive seat with capacitive sensors

The present invention relates to a method for discriminating the morphology of a passenger seating in an automotive seat, comprising the steps of i) providing a set of a plurality of capacitive sensors () covering substantially a transversal cross section of a seat, ii) collecting the outputs of said plurality of capacitive sensors () provided on the seat, iii) determining the morphology of a target () facing the seat on the basis of measured distance separating the target () from the sensors () and measured surface of the sensors () covered by the target (), from said outputs, and iv) comparing the determined morphology with at least a reference so as to classify the determined morphology between a plurality of reference ones.

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Sennely, France

Joaquim Da Silva