Snr Roulements

Ntn-snr Roulements

Sensitec Gmbh

Ntn Europe

Christophe Duret

Christophe Nicot

Pascal Desbiolles

Johannes Paul

Olivier Blanchin

Cécile Flammier

Etienne Vandamme

Cyril Peterschmitt

Vincent Pallanchard

Jean-François Charvet-Quemin

Jérôme Mathieu

David Kwapisz

Alexandre Laurent

Julien Lavoye

Michel Hehn

Alain Schuhl

Grégory Malinowski

Ralf Lindemann

Jan Marien

Sébastien Guillaume

The invention relates to a system comprising a coder that has an alternation of North and South magnetic poles separated by transitions extending along a helix of pitch p and of angle &#x3b1;, the magnetic track having Npairs of North and South poles and a polar width Lmeasured along a normal to the transitions which are: N=&#x3c0;a/l and L=p&#xb7;cos &#x3b1;. The invention also includes at least one sensor able to detect the rotating magnetic field in a plane perpendicular to the magnetic track and to the transitions by means of a mounting of at least two sensitive magnetic elements. The mounting being disposed at a radial reading distance from the magnetic track and being arranged to deliver signals in quadrature.

System for determining at least one rotation parameter of a rotating member

The invention relates to a system comprising a coder that has an alternation of North and South magnetic poles separated by transitions extending along an helix of pitch p and of angle &#x3b1;. The invention having Npairs of North and South poles and a polar width Lmeasured along a normal (N) to the transitions which are: N=&#x3c0;a/I and L=p.cos &#x3b1;. The invention also includes a sensor able to detect the period magnetic field emitted by the coder by means of at least two sensitive magnetic elements which are disposed at a radial reading distance from the magnetic track. The sensitive elements are disposed in relation to one another to deliver signals in quadrature.

The invention relates to a system having a coder with a magnetic track that exhibits an alternation of North and South magnetic poles separated by i Archimedean spiral transitions. The invention also includes a rotation sensor able to detect the periodic magnetic field emitted by the coder using several sensitive elements, the sensitive elements being distributed angularly along the magnetic track while forming between at least two sensitive elements an angle &#x3b1; which is designed so that the signals delivered by the elements are in quadrature.

The invention relates to an assembly comprising an encoder () secured in rotation to the member, said encoder comprising a primary magnetic track () and a secondary magnetic track () and a sensor () having two patterns () of sensitive elements which are suitable for detecting the signals supplied by the tracks () of the encoder (), each pattern () being arranged at reading distance from a track () to form a representative signal of the position of said track, the sensitive elements of a first pattern () are based on a magnetoresistive material wherein the resistance varies according to the magnetic signal of the track () to be detected, said first pattern being arranged at reading distance from a second track () having 2N&#x2212;1 magnetic pole pairs, the sensitive elements of the second pattern () being based on an anisotropic magnetoresistive material, said second pattern being arranged at reading distance from a primary track () having N magnetic pole pairs.

Assembly on a member of a system for determining the position of said member

The invention relates to a system comprising: an encoder the magnetic track of which has an alternation of North and South magnetic poles separated by transitions in Archimedean spiral, a rotation sensor able to detect the periodic magnetic field emitted by the encoder using a plurality of magnetic sensitive elements, distributed angularly along the magnetic track. Each magnetic sensitive element delivers a signal representative to the rotation of the encoder. The sensor further comprises a device for subtracting the signals (V, V) delivered by two sensitive elements forming therebetween an angle &#x3b3; that is such that: 0.55&#x3c0;&#x3c;&#x3b3;&#xb7;N, &#x3c;0.83&#x3c0;, modulo 2&#x3c0; or 1.17&#x3c0;&#x3c;&#x3b3;&#xb7;N&#x3c;1.45&#x3c0;, modulo 2&#x3c0;.

System for determining at least one rotation parameter of a rotary member

A sensor including a measuring assembly integrating at least one magnetoresistive element having a stack of two conductive magnetic layers, respectively reference and sensitive, the reference layer having magnetic anisotropy in the direction X and the sensitive layer having a direction Y, a polarization permanent magnet having a surface extending in a plane of directions X and Y and having a symmetry plane of directions X and Z, the measuring assembly being disposed with respect to the symmetry plane of the polarization magnet so that the layers of the magnetoresistive element are disposed in a plane parallel to the surface while being offset from said plane in the direction Y by a distance (&#x394;y) that is arranged so that the magnetic field of the polarization magnet orients the magnetisation of the sensitive layer in the direction Y.

Sensor for detecting a period magnetic field

A method is provided for estimating the components of the force torsor that are applied to a bearing, which method provides for the measurement of a vector (V) of N deformations and for the use of a physical model linking a vector (Q) of at most N representative values of the components of the torsor with a deformation measurement vector, the method comprises the following iterative steps: introduction of a vector (Q) of representative values into the model in order to calculate a deformation measurement vector (V); and carrying out a pertinence test (T) between the deformation measurement vector (V) which is calculated and the measured vector (V); if the test (T) is negative, establishing at least one new vector (Q) of representative values to be introduced into the model according to the result of the test; or if the test (T) is positive, storing the vector (Q) of introduced values; wherein the estimated components of the force torsor are established according to at least one stored vector (Q) of values.

Method for estimating the components of the force torsor that are applied to a bearing

The invention concerns a method for determining the running condition of a member rotating on a surface. The method includes an initial process of performing a spatial frequency analysis of the rotational speed of the member to identify at least one frequency window not including a harmonic of the revolution of the member wherein a law determining the running condition is established, and thereafter, an iterative process for determining the running condition including measuring the rotational speed V of the member; spatially sampling the speed with a constant spatial sampling period &#x394;d; and analyzing the sampled signal in the frequency window identified so as to determine the running condition on the basis of the established law.

Method for determining a running condition by spatial harmonic analysis of speed

A method for determining two pseudo-sinusoidal signals in quadrature from a pseudo-sinusoidal signal transmitted by an encoder is provided. The method using a sensor arranged within reading distance of the encoder, which sensor includes at least four sensing elements which are linearly equally distributed. The sensing elements are each capable of delivering a signal Srepresentative of the signal transmitted by the encoder. The method measuring the signals Sand combining the signals Sin order to form the signals U=(S&#x2212;S)&#x2212;(S&#x2212;S) and V=(S&#x2212;S), which signals U and V are in quadrature. A system for determining by implementing such a method, as well as a bearing including such a determination system, are provided.

Method for determining two pseudo-sinusoidal signals in quadrature

The invention concerns a system for determining the position of mobile element relative to a stationary structure, the system comprising an encoder configured to emit a pseudo-sinusoidal spatial signal representing the position of the encoder, a sensor () comprising a current-loop mount between at least two resistive elements () and a signal processing device Vconfigured to supply two quadrature signals respectively SIN and COS of same amplitude. The invention also concerns an antifriction bearing equipped with such a system for determining the angular position of the rotating ring relative to the stationary ring.

Current-loop position sensor and rolling bearing equipped with the same

The invention relates to a bearing comprising at least one system for determining the amplitude A of the pseudo-sinusoidal deformations of an area of the fixed race that are induced during rotation, the said system comprising at least three strain gauges (), a device for measuring three signals Vdepending respectively on the temporal variations of the signal emitted by each gauge (), the said device being able to form two signals SIN and COS respectively of like angle and like amplitude, and a device for calculating the amplitude A of the deformations of the area () as a function of time, the said device being designed to calculate the expression SIN+COSso as to deduce the amplitude A therefrom.

Deformation sensor bearing comprising at least three strain gauges

A bearing which includes at least one system for determining an amplitude of pseudo-sinusoidal deformations induced during rotation of a fixed ring within a zone, wherein the system includes four strain gauges spaced equally apart from each other within the zone, a device for measuring four signals based on time variations of a signal emitted by each gauge and for forming two signals for the same angle and amplitude, and a device for computing the time-dependent amplitude A of the zone deformations for calculating an expression such that the amplitude is derived therefrom.

Deformation-sensing bearing having four strain gauges

The system for determining the absolute angular position &#x3b8; of a steering wheel () of a motor vehicle with respect to the chassis thereof comprises a device for incrementally measuring the relative angular position &#x3b4; of the steering wheel, a device () for measuring the differential velocity &#x394;V/V of the wheels mounted on the same axle and a processing device () for sampling the angular positions and differential velocities at a period t. Said device comprises computing means suitable to determine at moments tn: the estimate &#x3b8;*(t) of an absolute angular position &#x3b8;(t) according to the differential velocity &#x394;V/V, the mean difference offset(t) between the angular positions &#x3b8;*(t) and &#x3b4;(t), wherein i is a variant ranging from 0 to n and the absolute angular position &#x3b8;(t) by the addition between the mean difference offset(t) and the angular position &#x3b4;(t).

Determination of the absolute angular position of a steering wheel by incremental measurement and measuring the differential speed of the wheels

A magnetoresistive sensor for measuring the strength of a magnetic filed includes a stack of a reference element, a separation element and an element sensitive to the magnetic field. The reference element and the sensitive element have, respectively, a first and a second magnetic anisotropy in a first and a second direction. The sensitive element includes the superposition of a layer of a ferromagnetic material and a layer of an antiferromagnetic material which are arranged to obtain a magnetic moment having a component oriented in the direction of the field to be measured that varies reversibly in relation to the strength of the magnetic field to be measured, and linearly in an adjustable field range.

Magnetoresistive sensor for measuring the strength of a magnetic field

A system for determining at least one parameter of at least one member () rotating with respect to a fixed structure (), includes, for each rotating member (), an assembly includes a transponder (), a coder (), an absolute position sensor () and a device () for detecting the parameter or parameters issuing from the transponder (). The system also includes an activation device () which is connected to each sensor () and to each detection device (), the activation device being able, according to the absolute position of the coder, to activate the detection device () of an assembly when the transponder () of the assembly is in the transmission/reception cone of the antenna of the detection device.

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Quintal, France

Christophe Duret