FR2473724A1 - Angular velocity sensor for aeronautical use - has rotor with toothed rim cooperating with facing toothed poles to induce voltage in static coil - Google Patents
Angular velocity sensor for aeronautical use - has rotor with toothed rim cooperating with facing toothed poles to induce voltage in static coil Download PDFInfo
- Publication number
- FR2473724A1 FR2473724A1 FR8000840A FR8000840A FR2473724A1 FR 2473724 A1 FR2473724 A1 FR 2473724A1 FR 8000840 A FR8000840 A FR 8000840A FR 8000840 A FR8000840 A FR 8000840A FR 2473724 A1 FR2473724 A1 FR 2473724A1
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- France
- Prior art keywords
- rotor
- toothed
- rotation
- sensor
- sensor according
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/488—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by variable reluctance detectors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Abstract
Description
La présente invention se rapporte à un capteur de mesure traduisant une vitesse angulaire en un signal électrique de fréquence proportionnelle à cette vitesse de rotation, ce capteur étant du type alternateur homopolaire à fer tournant et inducteur à aimant permanent. The present invention relates to a measurement sensor translating an angular speed into an electrical signal of frequency proportional to this speed of rotation, this sensor being of the zero sequence alternator type with rotating iron and inductor with permanent magnet.
On sait utiliser, notamment dans ce type d'appareil, des rotors dentés faisant périodiquement varier un entrefer donc une réluctance magnétique et par conséquent l'induction d'une bobine. Ces rotors sont en général soit des roues, soit des disques. It is known to use, in particular in this type of device, toothed rotors periodically varying an air gap therefore a magnetic reluctance and therefore the induction of a coil. These rotors are generally either wheels or discs.
La présente invention entend assurer, dans un capteur de mesure à vitesse angulaire, une excellente immunité aux vibrations mécaniques parasites et la possibilité de subir des accélérations angulaires très importantes. The present invention intends to ensure, in an angular velocity measurement sensor, excellent immunity to parasitic mechanical vibrations and the possibility of undergoing very significant angular accelerations.
L'invention entend également réduire au maximum le poids et l'encombrement du capteur de manière à permettre son utilisation, notamment mais non exclusivement, dans les applications aéronautiques. The invention also intends to minimize the weight and size of the sensor so as to allow its use, in particular but not exclusively, in aeronautical applications.
Le capteur selon l'invention, du type alternateur homopolaire à fer tournant et inducteur à aimant permanent, se caractérise en ce qu'il comprend, d'une part, un rotor à jante dentée et, d'autre part, un ensemble statique compact renfermant, entre deux pièces dentées, l'inducteur à aimant permanent et une bobine induite, la variation de la réluctance d'entrefer provoquée par la rotation du rotor engendrant une tension alternative aux bornes de la bobine. The sensor according to the invention, of the zero sequence alternator type with rotating iron and inductor with permanent magnet, is characterized in that it comprises, on the one hand, a rotor with toothed rim and, on the other hand, a compact static assembly enclosing, between two toothed parts, the permanent magnet inductor and an induced coil, the variation in the air gap reluctance caused by the rotation of the rotor generating an alternating voltage across the coil.
Cette disposition relative des différentes pièces fonctionnelles du capteur procure un trajet du flux magnétique le plus court possible, ce qui permet de réduire, à la fois, le poids de fer et le volume d'aimant et d'arriver ainsi à l'objectif d'encombrement et de poids minima du capteur. This relative arrangement of the different functional parts of the sensor provides the shortest possible magnetic flux path, which makes it possible to reduce both the weight of iron and the volume of magnet and thus achieve the objective d space and minimum weight of the sensor.
La disposition originale selon l'invention répond à cet objectif en apportant, de plus, un taux de fiabilité supérieur à celui d'un système à aimant rotorique équivalent: en effet, comme les contraintes mécaniques supportées par le rotor sont plus critiques (organe mobile), celui-ci est réalisé avec un minimum d'éléments. The original arrangement according to the invention meets this objective by providing, in addition, a higher reliability rate than that of an equivalent rotor magnet system: in fact, as the mechanical stresses supported by the rotor are more critical (movable member ), this is done with a minimum of elements.
D'autres caractéristiques et avantages de la présente invention ressortiront de la description qui va suivre, faite en regard du dessin annexé dont la figure unique représente, à grande échelle pour en voir les détails, une forme de réalisation d'un capteur selon l'invention qui, par ses caractéristiques, peut être d'un encombrement et d'un poids très réduits. Other characteristics and advantages of the present invention will emerge from the description which follows, given with reference to the appended drawing, the single figure of which represents, on a large scale to see the details, an embodiment of a sensor according to the invention which, by its characteristics, can be of a very compact size and weight.
Dans la forme de réalisation représentée, un capteur selon l'invention, du type alternateur homopolaire à fer tournant et inducteur à aimant permanent, comprend un rotor en fer doux (1) à jante dentée (rA). Le capteur comprend également un ensemble statique compact renfermant entre deux pièces polaires (2) et (3) dentées en (2A) et (3A), liinducteur à aimant permanent (4) et la bobine induite (5). L'ensemble statique est assemblé dans une pièce tubulaire (6) avantageusement réalisée en "duralumin". In the embodiment shown, a sensor according to the invention, of the zero-sequence alternator type with rotating iron and inductor with permanent magnet, comprises a soft iron rotor (1) with toothed rim (rA). The sensor also includes a compact static assembly containing between two pole pieces (2) and (3) toothed in (2A) and (3A), the permanent magnet inductor (4) and the induced coil (5). The static assembly is assembled in a tubular part (6) advantageously made of "duralumin".
La forme en jante conférée au rotor permet, d'une part, une moindre sensibilité aux vibrations mécaniques, aussi bien dans la direction axiale que dans le sens radial, grâce à la réduction de masse qu'elle engendre et, d'autre part, elle permet d'accepter des accélérations angulaires très importantes grâce à la réduction inertie qu'elle procure. The rim shape given to the rotor allows, on the one hand, a lower sensitivity to mechanical vibrations, both in the axial direction than in the radial direction, thanks to the reduction in mass which it generates and, on the other hand, it makes it possible to accept very large angular accelerations thanks to the inertia reduction which it provides.
La longueur utile du stator (LS) au niveau de l'entrefer est inférieure à celle du rotor (LR). - Cette caractéristique permet de s'affranchir des effets des vibrations axiales qui - n'entrainent ainsi aucune variation de réluctance du circuit magnétique, donc aucun signal électrique parasite dans la bobine (5). The useful length of the stator (LS) at the air gap is less than that of the rotor (LR). - This characteristic makes it possible to overcome the effects of axial vibrations which - thus do not cause any variation in reluctance of the magnetic circuit, therefore no parasitic electrical signal in the coil (5).
La bobine induite (5), est concentrique à l'axe de rotation (X-X) du capteur et chacune de ses spires embrasse la totalité du flux magnétique utile. Cette caractéristique permet de réaliser une mesure moyenne de la variation de flux sur la totalité de l'entrefer et supprime ainsi une modulation du signal due au défaut de concentricité entre rotor et stator. De plus, cette caractéristique permet de minimiser les effets des vibrations radiales au niveau au signal électrique. The induced coil (5) is concentric with the axis of rotation (X-X) of the sensor and each of its turns embraces all of the useful magnetic flux. This characteristic makes it possible to perform an average measurement of the flux variation over the entire air gap and thus eliminates a modulation of the signal due to the lack of concentricity between rotor and stator. In addition, this characteristic makes it possible to minimize the effects of radial vibrations at the level of the electrical signal.
Le capteur selon l'invention est, suivant un exemple de réalisation, étudié pour fournir 200 impulsions par tour avec une dynamique de 100 Hz à 10 kHz (30 t/mn à 3 000 t/mn) pour une valeur efficace de signal de sortie de 0,7 Volts minimum sur une charge résistive de 3 Kohms. The sensor according to the invention is, according to an exemplary embodiment, studied to supply 200 pulses per revolution with a dynamic range of 100 Hz to 10 kHz (30 rpm to 3,000 rpm) for an effective value of the output signal 0.7 Volts minimum on a resistive load of 3 Kohms.
- I1 est bien entendu que-lå présente invention n'a été décrite et représentée qu'à titre d'exemple préférentiel et qu'on pourra apporter des équivalences dans ses éléments constitutifs sans, pour autant, sortir du cadre de l'invention qui est défini dans les revendications qui suivent. - It is understood that the present invention has only been described and shown as a preferred example and that it will be possible to provide equivalences in its constituent elements without, however, departing from the scope of the invention which is defined in the claims which follow.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8000840A FR2473724A1 (en) | 1980-01-15 | 1980-01-15 | Angular velocity sensor for aeronautical use - has rotor with toothed rim cooperating with facing toothed poles to induce voltage in static coil |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8000840A FR2473724A1 (en) | 1980-01-15 | 1980-01-15 | Angular velocity sensor for aeronautical use - has rotor with toothed rim cooperating with facing toothed poles to induce voltage in static coil |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2473724A1 true FR2473724A1 (en) | 1981-07-17 |
FR2473724B1 FR2473724B1 (en) | 1983-11-25 |
Family
ID=9237556
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8000840A Granted FR2473724A1 (en) | 1980-01-15 | 1980-01-15 | Angular velocity sensor for aeronautical use - has rotor with toothed rim cooperating with facing toothed poles to induce voltage in static coil |
Country Status (1)
Country | Link |
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FR (1) | FR2473724A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0190879A1 (en) * | 1985-02-06 | 1986-08-13 | LUCAS INDUSTRIES public limited company | In-axle vehicle wheel speed sensing device |
FR2602280A1 (en) * | 1986-08-01 | 1988-02-05 | Ducellier & Cie | INDUCTIVE SENSOR FOR THE TRANSMISSION OF A SIGNAL FOR TRIGGERING AN IGNITION DEVICE FOR AN INTERNAL COMBUSTION ENGINE AND IGNITION DEVICE COMPRISING SUCH AN INDUCTIVE SENSOR |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1911515A1 (en) * | 1968-07-01 | 1970-01-29 | Kelsey Hayes Compnay | Speed transducer |
DE1913468A1 (en) * | 1968-08-16 | 1970-03-05 | Kelsey Hayes Co | Speed transducer |
DE2201738A1 (en) * | 1971-01-15 | 1972-08-10 | Girling Ltd | Angular velocity sensor |
DE2244948A1 (en) * | 1972-09-13 | 1974-04-11 | Teldix Gmbh | HYBRID SENSOR |
-
1980
- 1980-01-15 FR FR8000840A patent/FR2473724A1/en active Granted
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1911515A1 (en) * | 1968-07-01 | 1970-01-29 | Kelsey Hayes Compnay | Speed transducer |
DE1913468A1 (en) * | 1968-08-16 | 1970-03-05 | Kelsey Hayes Co | Speed transducer |
DE2201738A1 (en) * | 1971-01-15 | 1972-08-10 | Girling Ltd | Angular velocity sensor |
DE2244948A1 (en) * | 1972-09-13 | 1974-04-11 | Teldix Gmbh | HYBRID SENSOR |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0190879A1 (en) * | 1985-02-06 | 1986-08-13 | LUCAS INDUSTRIES public limited company | In-axle vehicle wheel speed sensing device |
FR2602280A1 (en) * | 1986-08-01 | 1988-02-05 | Ducellier & Cie | INDUCTIVE SENSOR FOR THE TRANSMISSION OF A SIGNAL FOR TRIGGERING AN IGNITION DEVICE FOR AN INTERNAL COMBUSTION ENGINE AND IGNITION DEVICE COMPRISING SUCH AN INDUCTIVE SENSOR |
EP0258074A1 (en) * | 1986-08-01 | 1988-03-02 | Sagem Allumage | Inductive signal emitter sensor to trigger an ignition device of an internal combustion engine and ignition device including such an inductive sensor |
Also Published As
Publication number | Publication date |
---|---|
FR2473724B1 (en) | 1983-11-25 |
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