FR2715736A1 - Electronic appts. for measurement of shaft speed and direction - Google Patents

Electronic appts. for measurement of shaft speed and direction Download PDF

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Publication number
FR2715736A1
FR2715736A1 FR9401029A FR9401029A FR2715736A1 FR 2715736 A1 FR2715736 A1 FR 2715736A1 FR 9401029 A FR9401029 A FR 9401029A FR 9401029 A FR9401029 A FR 9401029A FR 2715736 A1 FR2715736 A1 FR 2715736A1
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France
Prior art keywords
conductive
ring
wipers
rotation
speed
Prior art date
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Granted
Application number
FR9401029A
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French (fr)
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FR2715736B1 (en
Inventor
Delevallee Jean-Louis
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Inteva Products France SAS
Original Assignee
Rockwell Body and Chassis Systems France
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Publication date
Application filed by Rockwell Body and Chassis Systems France filed Critical Rockwell Body and Chassis Systems France
Priority to FR9401029A priority Critical patent/FR2715736B1/en
Publication of FR2715736A1 publication Critical patent/FR2715736A1/en
Application granted granted Critical
Publication of FR2715736B1 publication Critical patent/FR2715736B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42Devices characterised by the use of electric or magnetic means
    • G01P3/44Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/484Devices 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 contact-making switches
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P13/00Indicating or recording presence, absence, or direction, of movement
    • G01P13/02Indicating direction only, e.g. by weather vane
    • G01P13/04Indicating positive or negative direction of a linear movement or clockwise or anti-clockwise direction of a rotational movement
    • G01P13/045Indicating positive or negative direction of a linear movement or clockwise or anti-clockwise direction of a rotational movement with speed indication

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)

Abstract

The appts. consists of a cylinder (5) attached to the rotating shaft comprising two parallel sections, one of which (5a) is continuously conductive while the other consists of alternate conducting and insulating sections (5b,5c,5d,5e). Contact brushes (7,8,9) are arranged to contact the rotating cylinder so that one brush (7) is in permanent contact with the conducting strip (5a) while the others (8,9) are displaced angularly and make contact either with conducting or insulating areas on the second strip (5b,5d). An electronic circuit (10) measures conductivity between the brushes (7,8,9) and determines speed and direction of rotation.

Description

La présente invention concerne un dispositif de détermination de la vitesse de rotation d'un arbre de sortie d'un moteur électrique. The present invention relates to a device for determining the speed of rotation of an output shaft of an electric motor.

On connait déjà dans l'état de la technique, des dispositifs de détermination de ce type qui comportent une bague codée rotative reliée à l'arbre et comportant des portions conductrices et isolantes de l'électricité, adaptées pour coopérer avec des frotteurs raccordés à des moyens de détermination de la vitesse de rotation de l'arbre.  There are already known in the prior art, determination devices of this type which include a rotary coded ring connected to the shaft and comprising conductive and insulating portions of electricity, adapted to cooperate with wipers connected to means for determining the speed of rotation of the shaft.

Dans l'état de la technique, la bague comporte une piste périphérique munie de portions conductrices et isolantes de l'électricité et par exemple deux frotteurs décalés angulairement peuvent être associés à cette piste. In the prior art, the ring comprises a peripheral track provided with conductive and insulating portions of electricity and for example two wipers angularly offset can be associated with this track.

On conçoit alors que lors de la rotation de l'arbre et donc de la bague, les frotteurs sont connectés l'un à l'autre ou non en fonction de la position des portions conductrices et isolantes de la bague par rapport à ces frotteurs, et ce, à une fréquence dépendant de la vitesse de rotation de l'arbre. It can therefore be seen that during the rotation of the shaft and therefore of the ring, the wipers are connected to one another or not depending on the position of the conductive and insulating portions of the ring relative to these wipers, and this, at a frequency depending on the speed of rotation of the shaft.

Cependant, ces dispositifs de détermination présentent un certain nombre d'inconvénients, car leur résolution est limitée du fait de leur structure, ce qui peut avoir des conséquences génantes lorsque ces dispositifs sont utilisés dans des applications de sécurité, comme par exemple pour commander l'alimentation d'un moteur électrique d'entrainement d'un mécanisme de lèvevitre de véhicule. However, these determination devices have a certain number of drawbacks, because their resolution is limited due to their structure, which can have annoying consequences when these devices are used in security applications, such as for example for controlling the power supply for an electric motor driving a vehicle window mechanism.

On conçoit en effet que dans ce type d'applications, il est nécessaire que la détermination de vitesse soit la plus fiable et le plus précise possible pour éviter tout accident. It is in fact understood that in this type of application, it is necessary that the speed determination be as reliable and as precise as possible to avoid any accident.

Le but de l'invention est donc de résoudre ces problèmes en proposant un dispositif de détermination de vitesse qui soit simple et fiable.  The object of the invention is therefore to solve these problems by proposing a speed determination device which is simple and reliable.

A cet effet, l'invention a pour objet un dispositif de détermination de la vitesse de rotation d'un arbre de sortie d'un moteur électrique, du type comportant une bague codée rotative, reliée à l'arbre et comportant des portions conductrices et isolantes de l'électricité adaptées pour coopérer avec des frotteurs raccordés à des moyens de détermination de vitesse, caractérisé en ce que la bague comporte une portion périphérique conductrice pour former une première piste continue associée à un frotteur, à partir de laquelle s'étend au moins une portion axiale conductrice pour former avec au moins une portion isolante de la bague, une seconde piste codée associée à au moins un frotteur. To this end, the subject of the invention is a device for determining the speed of rotation of an output shaft of an electric motor, of the type comprising a rotary coded ring, connected to the shaft and comprising conductive portions and electrical insulators adapted to cooperate with wipers connected to speed determining means, characterized in that the ring has a conductive peripheral portion to form a first continuous track associated with a wiper, from which extends to the at least one axial conductive portion to form, with at least one insulating portion of the ring, a second coded track associated with at least one wiper.

Avantageusement, la bague comporte plusieurs portions axiales conductrices décalées angulairement et la seconde piste est associée à deux frotteurs décalés angulairement et raccordés à des moyens de détermination du sens de rotation de l'arbre. Advantageously, the ring comprises several axial conductive portions offset angularly and the second track is associated with two wipers offset angularly and connected to means for determining the direction of rotation of the shaft.

L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés, sur lesquels
- la Fig.1 représente une vue en perspective illustrant l'implantation d'un dispositif de détermination selon l'invention sur l'arbre de sortie d'un moteur électrique;
- la Fig.2 représente une vue développée d'une bague codée entrant dans la constitution d'un dispositif de détermination selon l'invention; et
- la Fig.3 illustre la forme des signaux délivrés par des frotteurs entrant dans la constitution d'un dispositif de détermination selon l'invention.
The invention will be better understood on reading the description which follows, given solely by way of example and made with reference to the accompanying drawings, in which
- Fig.1 shows a perspective view illustrating the installation of a determination device according to the invention on the output shaft of an electric motor;
- Fig.2 shows a developed view of a coded ring forming part of a determination device according to the invention; and
- Fig.3 illustrates the shape of the signals delivered by wipers entering into the constitution of a determination device according to the invention.

Ainsi qu'on peut le voir sur les figures 1 et 2, un dispositif de détermination selon l'invention est adapté pour déterminer la vitesse de rotation d'un arbre de sortie 1 d'un moteur électrique, désigné par la référence générale 2 et dont seul le rotor 3 et le collecteur 4 sont représentés sur cette figure 1. As can be seen in FIGS. 1 and 2, a determination device according to the invention is suitable for determining the speed of rotation of an output shaft 1 of an electric motor, designated by the general reference 2 and of which only the rotor 3 and the collector 4 are shown in this figure 1.

Ce dispositif de détermination comporte une bague codée rotative 5 reliée à l'arbre de sortie du moteur et comportant des portions conductrices et isolantes de l'électricité adaptées pour coopérer avec des frotteurs raccordés à des moyens de détermination de la vitesse, par exemple extérieurs au moteur. This determination device comprises a rotary coded ring 5 connected to the motor output shaft and comprising conductive and insulating portions of electricity adapted to cooperate with wipers connected to means for determining the speed, for example outside the engine.

Comme on peut le voir sur les figures 1 et 2, la bague 5 comporte une portion périphérique conductrice de l'électricité 5a pour former une première piste continue 6a associée à un frotteur 7. As can be seen in FIGS. 1 and 2, the ring 5 includes an electrically conductive peripheral portion 5a to form a first continuous track 6a associated with a wiper 7.

Au moins une portion axiale conductrice s'étend à partir de la portion périphérique conductrice 5a pour former avec au moins une portion isolante de la bague, une seconde piste codée 6b associée à au moins un frotteur. At least one conductive axial portion extends from the conductive peripheral portion 5a to form, with at least one insulating portion of the ring, a second coded track 6b associated with at least one wiper.

Dans l'exemple de réalisation représenté sur ces figures 1 et 2, deux portions axiales conductrices 5b et 5c s'étendent à partir de la portion périphérique 5a pour former la seconde piste codée 6b, ces portions conductrices étant séparées par des portions isolantes de la bague, respectivement 5d et 5e. In the embodiment shown in these Figures 1 and 2, two axial conductive portions 5b and 5c extend from the peripheral portion 5a to form the second coded track 6b, these conductive portions being separated by insulating portions of the ring, respectively 5d and 5th.

Cette seconde piste codée 6b est associée dans l'exemple de réalisation décrit en regard de ces figures, à deux frotteurs 8 et 9 décalés angulairement et raccordés à des moyens 10 de détermination de vitesse de rotation et de sens de rotation de l'arbre. This second coded track 6b is associated in the embodiment described with reference to these figures, with two wipers 8 and 9 angularly offset and connected to means 10 for determining the speed of rotation and the direction of rotation of the shaft.

Dans ce cas, le frotteur 7 associé à la première piste 6a est reliée par exemple à une borne de potentiel de référence, la seconde piste codée 6b et plus particulièrement les portions conductrices et isolantes de celleci assurant la connexion ou non de ce frotteur 7 aux frotteurs 8 et/ou 9 en fonction de leur position relative par rapport à ces frotteurs, au cours de la rotation de l'arbre de sortie du moteur. In this case, the wiper 7 associated with the first track 6a is connected for example to a reference potential terminal, the second coded track 6b and more particularly the conductive and insulating portions of this ensuring the connection or not of this wiper 7 to wipers 8 and / or 9 as a function of their relative position with respect to these wipers, during the rotation of the motor output shaft.

On conçoit alors que les signaux S8 et S9 issus de ces frotteurs 8 et 9 sont déphasés et peuvent présenter la forme illustrée sur la Fig.3 et comporter des créneaux, par exemple, dont la durée est représentative de la vitesse de rotation de l'arbre de sortie du moteur. Les moyens de détermination 10 peuvent présenter n'importe quelle structure appropriée, permettant de calculer cette vitesse, à partir par exemple de ces créneaux. It can therefore be seen that the signals S8 and S9 from these wipers 8 and 9 are out of phase and can have the shape illustrated in FIG. 3 and include slots, for example, the duration of which is representative of the speed of rotation of the motor output shaft. The determination means 10 can have any suitable structure, making it possible to calculate this speed, for example from these slots.

Par ailleurs, l'utilisation de deux frotteurs décalés associés à la seconde piste codée, permet également de déterminer le sens de rotation de l'arbre de sortie du moteur par analyse classique des signaux de sortie déphasés issus de ces frotteurs. Furthermore, the use of two offset wipers associated with the second coded track also makes it possible to determine the direction of rotation of the motor output shaft by conventional analysis of the phase-shifted output signals from these wipers.

Il va de soi bien entendu qu'un nombre de portions axiales conductrices et un nombre de frotteurs différents de ceux décrits, peuvent être utilisés pour améliorer encore la résolution du dispositif de détermination selon l'invention.  It goes without saying of course that a number of conductive axial portions and a number of wipers different from those described can be used to further improve the resolution of the determination device according to the invention.

Claims (3)

REVENDCATIONS 1. Dispositif de détermination de la vitesse de rotation d'un arbre de sortie d'un moteur électrique (2) du type comportant une bague codée rotative (5), reliée à l'arbre (1) et comportant des portions conductrices et isolantes de l'électricité adaptées pour coopérer avec des frotteurs (7,8,9) raccordés à des moyens (10) de détermination de vitesse, caractérisé en ce que la bague (5) comporte une portion périphérique conductrice (5a) pour former une première piste continue (6a) associée à un frotteur (7), à partir de laquelle s'étend au moins une portion axiale conductrice (5b,5c) pour former avec au moins une portion isolante (5d,5e) de la bague, une seconde piste codée (6b) associée à au moins un frotteur (8,9). 1. Device for determining the speed of rotation of an output shaft of an electric motor (2) of the type comprising a rotary coded ring (5), connected to the shaft (1) and comprising conductive and insulating portions electricity adapted to cooperate with wipers (7,8,9) connected to speed determining means (10), characterized in that the ring (5) has a conductive peripheral portion (5a) to form a first continuous track (6a) associated with a wiper (7), from which extends at least one axial conductive portion (5b, 5c) to form with at least one insulating portion (5d, 5e) of the ring, a second coded track (6b) associated with at least one wiper (8,9). 2. Dispositif selon la revendication 1, caractérisé en ce que la bague (5) comporte plusieurs portions axiales conductrices (5b,5c) décalées angulairement. 2. Device according to claim 1, characterized in that the ring (5) comprises several conductive axial portions (5b, 5c) angularly offset. 3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que la seconde piste (6b) est associée à deux frotteurs (8,9) décalés angulairement et raccordés à des moyens (10) de détermination du sens de rotation de 1 ' arbre.  3. Device according to claim 1 or 2, characterized in that the second track (6b) is associated with two wipers (8,9) angularly offset and connected to means (10) for determining the direction of rotation of the shaft .
FR9401029A 1994-01-31 1994-01-31 Device for determining the speed of rotation of an output shaft of an electric motor. Expired - Fee Related FR2715736B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9401029A FR2715736B1 (en) 1994-01-31 1994-01-31 Device for determining the speed of rotation of an output shaft of an electric motor.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9401029A FR2715736B1 (en) 1994-01-31 1994-01-31 Device for determining the speed of rotation of an output shaft of an electric motor.

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FR2715736A1 true FR2715736A1 (en) 1995-08-04
FR2715736B1 FR2715736B1 (en) 1996-04-12

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3210658A (en) * 1961-11-07 1965-10-05 Collins Radio Co Shaft rotational velocity and direction indicating means utilizing a pulse producingand blocking commutator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3210658A (en) * 1961-11-07 1965-10-05 Collins Radio Co Shaft rotational velocity and direction indicating means utilizing a pulse producingand blocking commutator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PETUKHOV ET AL: "LINEAR AND ANGULAR VELOCITY MEASUREMENT FOR EFFECTOR UNITS", MEASUREMENT TECHNIQUES, vol. 27, no. 4, April 1884 (1884-04-01), NEW YORK, pages 325 - 327 *

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FR2715736B1 (en) 1996-04-12

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