ES2317777A1 - Protective shield system for inductive sensors (Machine-translation by Google Translate, not legally binding) - Google Patents

Protective shield system for inductive sensors (Machine-translation by Google Translate, not legally binding) Download PDF

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Publication number
ES2317777A1
ES2317777A1 ES200700863A ES200700863A ES2317777A1 ES 2317777 A1 ES2317777 A1 ES 2317777A1 ES 200700863 A ES200700863 A ES 200700863A ES 200700863 A ES200700863 A ES 200700863A ES 2317777 A1 ES2317777 A1 ES 2317777A1
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Prior art keywords
sensor device
plane
inductive
coils
inductive sensors
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Granted
Application number
ES200700863A
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Spanish (es)
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ES2317777B1 (en
Inventor
Sergio Diez Garcia
Jose Luis Landatxe Zugarramurdi
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Zertan SA
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Zertan SA
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Priority to ES200700863A priority Critical patent/ES2317777B1/en
Publication of ES2317777A1 publication Critical patent/ES2317777A1/en
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/24—Housings ; Casings for instruments
    • G01D11/245—Housings for sensors

Abstract

Protective shielding system for inductive sensors, which consists of providing an electrical conductive and non-magnetic conductive plane (1) between the coils (2) of the inductive sensor device and the metal structure of the same in its application, establishing said plane ( 1) in connection with the power supply of the sensor device to avoid the influence of the parasitic capacitive coupling on the coils (2). (Machine-translation by Google Translate, not legally binding)

Description

Sistema de blindaje protector para sensores inductivos.Protective shielding system for sensors inductive

Sector de la técnicaTechnical sector

La presente invención está relacionada con el control del movimiento de mecanismos en máquinas o aparatos mediante el empleo de sensores inductivos, proponiendo un sistema que permite anular el acoplamiento capacitivo parásito causante de I perturbaciones en los sensores utilizados en dicha aplicación.The present invention is related to the control of the movement of mechanisms in machines or devices through the use of inductive sensors, proposing a system which allows to cancel the parasitic capacitive coupling causing I disturbances in the sensors used in said application.

Estado de la técnicaState of the art

Es conocida, como se describe, por ejemplo, en la Patente ES 200501503, la utilización de dispositivos para controlar el movimiento de determinados mecanismos, utilizándose para ello sensores inductivos formados por una bobina frente a la que se hace pasar 1 un imán dispuesto sobre el elemento móvil a controlar, de forma que el paso del imán altera el flujo magnético presente en la bobina del dispositivo sensor, induciendo en la misma una fuerza electromotriz o tensión eléctrica, en función de la cual se pueden obtener pulsos digitales que se corresponden con el movimiento del elemento móvil.It is known, as described, for example, in ES Patent 200501503, the use of devices for control the movement of certain mechanisms, using for this inductive sensors formed by a coil in front of the which is passed 1 a magnet arranged on the mobile element to control, so that the passage of the magnet alters the magnetic flux present in the coil of the sensor device, inducing in the same an electromotive force or electrical voltage, depending on which you can get digital pulses that correspond to the movement of the mobile element.

Una realización de los sensores inductivos para dicha aplicación es la que dispone dos semibobinas 1 acopladas eléctricamente en serie y magnéticamente en oposición, sobre las cuales el imán dispuesto en el elemento móvil a controlar genera una influencia variable en función del movimiento, dando lugar a una fuerza electromotriz que se puede convertir en pulsos equivalentes al movimiento del elemento móvil, pero sin embargo las influencias parásitas causadas por mecanismos adyacentes fijos, en los que circulen corrientes variables con el tiempo, inducen en las semibobinas unas fuerzas electromotrices que se contrarrestan, evitándose así las perturbaciones por estas influencias parásitas.An embodiment of inductive sensors for this application is the one that has two half-bobbins 1 coupled electrically in series and magnetically in opposition, on the which the magnet arranged in the mobile element to control generates a variable influence depending on the movement, resulting in a electromotive force that can be converted into equivalent pulses to the movement of the mobile element, but nevertheless the influences parasites caused by fixed adjacent mechanisms, in which variable currents circulate over time, induce semi-coils electromotive forces that are counteracted, avoiding disturbances by these influences parasites

En este sentido, la Patente ES 200502717 contempla una solución que dispone dos semibobinas paralelas enfrentadas perpendicularmente al paso del imán incorporado en el elemento móvil a controlar, mientras que la adición de dicha Patente ES 200601913 contempla una solución que dispone dos semibobinas axialmente consecutivas incorporadas sobre un núcleo común, en posición paralela respecto del paso del imán incorporado en el elemento móvil a controlar.In this regard, ES Patent 200502717 contemplates a solution that has two parallel semi-bobbins faced perpendicularly to the passage of the magnet incorporated in the mobile element to control while adding said Patent ES 200601913 contemplates a solution that has two axially consecutive semi-bobbins incorporated on a core common, in parallel position with respect to the passage of the built-in magnet in the mobile element to control.

Sin embargo, en la incorporación de los mencionados sensores inductivos en ciertas aplicaciones, como por ejemplo en los lavavajillas, las bobinas del dispositivo sensor se disponen muy próximas a la pared metálica de la estructura de montaje, lo cual da lugar a la formación de un condensador parásito entre las mencionadas bobinas y la chapa metálica de la 5 estructura de montaje, la cual generalmente está conectada al cable de tierra de protección del aparato correspondiente.However, in the incorporation of mentioned inductive sensors in certain applications, as per example in dishwashers, the coils of the sensor device are they have very close to the metal wall of the structure of assembly, which results in the formation of a parasitic capacitor  between the mentioned coils and the sheet metal of the 5 mounting structure, which is usually connected to the cable of protective earth of the corresponding device.

Por ello, entre la tierra de protección del aparato y las líneas de alimentación eléctrica del sensor se originan, durante el funcionamiento del aparato, unas diferencias de potencial. Habiéndose constatado que, en el caso de los aparatos que disponen de bombas de velocidad variable controlada electrónicamente, dichas diferencias de potencial tienen un contenido en frecuencias elevadas, que son capaces de acoplarse a las bobinas del dispositivo detector a través del condensador parásito antes referido, ocasionando una perturbación incompatible con la función detectora del sensor.Therefore, between the protective land of the apparatus and sensor power lines are originate, during the operation of the device, some differences of potential Having found that, in the case of devices that have variable speed controlled pumps electronically, these potential differences have a content in high frequencies, which are capable of coupling to the coils of the detector device through the condenser parasite referred to above, causing incompatible disturbance With the sensor detection function.

Objeto de la invenciónObject of the invention

De acuerdo con la invención se propone un sistema que permite resolver de manera sencilla las perturbaciones provenientes del acoplamiento capacitivo parásito en los sensores inductivos, para que la función de los mismos resulte efectiva.According to the invention, a system that allows the disturbances to be resolved easily from the parasitic capacitive coupling in the sensors inductive, so that their function is effective.

Este sistema objeto de la invención consiste en la adición de un plano conductor eléctrico y no conductor magnético, entre las bobinas del sensor inductivo y la estructura metálica del montaje de aplicación, conectándose dicho plano eléctricamente a una de las líneas de alimentación del dispositivo sensor.This system object of the invention consists of the addition of an electric conductor and non-conductor plane magnetic, between the coils of the inductive sensor and the structure metal of the application assembly, said plane connecting electrically to one of the device power lines sensor.

Con esta disposición se consigue una derivación de la corriente perturbadora proveniente del acoplamiento capacitivo parásito, hacia dicha línea conectada con el plano incorporado, obteniéndose un efecto de blindaje que impide el acoplamiento capacitivo de perturbaciones respecto de las bobinas del dispositivo sensor.With this arrangement a derivation is achieved of the disturbing current from the coupling capacitive parasite, towards said line connected to the plane incorporated, obtaining a shielding effect that prevents capacitive coupling of disturbances with respect to the coils of the sensor device.

Según una realización práctica, el plano de blindaje se prevé constituido por una lámina aislante recubierta de cobre por una de las caras, que puede ser obtenida de manera sencilla y económica por troquelado a partir de una plancha cobreada de las del tipo que se utilizan para la fabricación de circuitos impresos, estableciéndose la conexión entre dicho plano y la alimentación del dispositivo sensor mediante un muelle que se dispone intercalado, lo cual hace también sencillo el montaje.According to a practical embodiment, the plane of shielding is provided consisting of an insulating sheet covered with copper on one of the faces, which can be obtained in a way simple and economical by punching from a copper plate of the type used for circuit manufacturing printed, establishing the connection between said plane and the supply of the sensor device by means of a spring that It has interleaving, which also makes assembly simple.

Por la función que cumple y su sencillez de aplicación, el sistema de la invención resulta de unas características ciertamente ventajosas, adquiriendo vida propia y carácter preferente como medio para evitar las perturbaciones por acoplamiento capacitivo parásito que pueden afectar a la actividad de los sensores inductivos de control de elementos móviles.For the function it fulfills and its simplicity of application, the system of the invention results from some certainly advantageous features, acquiring a life of its own and preferred character as a means to avoid disturbances by capacitive parasitic coupling that can affect activity of inductive sensors for control of moving elements.

Descripción de las figurasDescription of the figures

La figura 1 muestra en perspectiva un ejemplo de sensor inductivo en el que es aplicable el sistema de la invención.Figure 1 shows in perspective an example of  inductive sensor in which the system of the invention.

La figura 2 es una perspectiva explosionada del sensor inductivo de la figura anterior, observándose la incorporación del blindaje protector según la invención.Figure 2 is an exploded perspective of the inductive sensor of the previous figure, observing the incorporation of the protective shield according to the invention.

La figura 3 es una vista seccionada del sensor inductivo, apreciándose la disposición de los elementos funcionales en el mismo.Figure 3 is a sectional view of the sensor inductive, appreciating the disposition of functional elements in the same.

La figura 4 es una perspectiva del sensor inductivo con la carcasa exterior seccionada.Figure 4 is a sensor perspective inductive with the outer housing sectioned.

Descripción detallada de la invenciónDetailed description of the invention

El objeto de la invención se refiere a un sistema para eliminar el efecto de las perturbaciones por acoplamiento capacitivo parásito en los sensores inductivos que se utilizan para controlar movimientos de mecanismos, utilizando una disposición muy fácil de aplicar pero que resulta totalmente efectiva para la función indicada.The object of the invention relates to a system to eliminate the effect of disturbances by capacitive parasitic coupling in inductive sensors that used to control movements of mechanisms, using a very easy to apply but that is totally effective for the indicated function.

El sistema preconizado consiste en incorporar un plano (1) conductor eléctrico y no conductor magnético, entre la parte frontal de las bobinas (2) del dispositivo sensor inductivo y la estructura metálica del montaje de aplicación.The recommended system consists of incorporating a  flat (1) electric conductor and non-magnetic conductor, between the front of the coils (2) of the inductive sensor device and The metal structure of the application assembly.

Según una realización, el plano (1) puede ser una lámina aislante recubierta de cobre por una de las caras, por ejemplo en forma de una plancha cobreada de las que se utilizan para la fabricación de circuitos impresos.According to one embodiment, the plane (1) can be an insulating sheet covered with copper on one of the sides, by example in the form of a copper plate which are used for the manufacture of printed circuits.

En la disposición respecto del dispositivo sensor inductivo de aplicación, dicho plano (1) se coloca frente a las bobinas (2), con la cara conductora hacia las mismas, estableciéndose un contacto eléctrico entre dicha cara conductora del mencionado plano (1) y la alimentación del dispositivo sensor dispuesta en el circuito impreso (3) de éste, mediante un muelle (4), alojándose todo ello encerrado dentro la carcasa aislante (5) del dispositivo sensor.In the provision regarding the device inductive application sensor, said plane (1) is placed in front of the coils (2), with the conductive face towards them, establishing an electrical contact between said conductive face of the mentioned plane (1) and the feeding of the sensor device arranged in the printed circuit (3) thereof, by means of a spring (4), all of which is housed inside the insulating housing (5) of the sensor device.

Con esta disposición, la corriente perturbadora que se origina por el acoplamiento capacitivo parásito del dispositivo sensor con respecto a la estructura del montaje de sujeción, se deriva hacia la línea de conexión eléctrica del plano (1), impidiendo así la aparición de perturbaciones capacitivas parásitas en las bobinas (2) del dispositivo.With this arrangement, the disturbing current that originates from the parasitic capacitive coupling of the sensor device with respect to the mounting structure of clamping, drifts to the electrical connection line of the plane (1), thus preventing the occurrence of capacitive disturbances parasites in the coils (2) of the device.

El resultado funcional de esta disposición es independiente de las características constructivas del dispositivo sensor inductivo de aplicación, resultando igualmente eficaz con una disposición de bobinas (2) con núcleos paralelos y perpendiculares a la estructura metálica de sujeción del dispositivo sensor, como con una disposición de las bobinas (2) del dispositivo sensor sobre un núcleo común paralelo a la estructura metálica de sujeción del dispositivo.The functional result of this provision is independent of the constructive characteristics of the device inductive sensor application, being equally effective with an arrangement of coils (2) with parallel cores and perpendicular to the metal support structure of the sensor device, as with an arrangement of the coils (2) of the sensor device on a common core parallel to the structure metal clamping device.

Claims (3)

1. Sistema de blindaje protector para sensores inductivos, destinado para eliminar las perturbaciones parásitas por acoplamiento capacitivo del dispositivo sensor inductivo con respecto a la estructura metálica de sujeción en su montaje de aplicación, caracterizado porque entre las bobinas (2) del dispositivo sensor inductivo y la estructura metálica de sujeción del mismo se incorpora un plano (1) conductor eléctrico y no conductor magnético, estableciéndose dicho plano (1) en conexión con la alimentación eléctrica del dispositivo sensor, de forma que la corriente eléctrica proveniente del acoplamiento capacitivo parásito es derivada por el mencionado plano (1) hacia la línea de conexión eléctrica, evitando su influencia en las bobinas (2).1. Protective shielding system for inductive sensors, intended to eliminate parasitic disturbances by capacitive coupling of the inductive sensor device with respect to the metal clamping structure in its application assembly, characterized in that between the coils (2) of the inductive sensor device and The metal support structure thereof incorporates an electric conductor plane (1) and non-magnetic conductor, said plane (1) being established in connection with the power supply of the sensor device, so that the electric current from the parasitic capacitive coupling is derived by the mentioned plane (1) towards the electrical connection line, avoiding its influence on the coils (2). 2. Sistema de blindaje protector para sensores inductivos, de acuerdo con la primera reivindicación, caracterizado porque la conexión eléctrica entre el plano (1) y la alimentación eléctrica del dispositivo sensor, se establece mediante un muelle (4) que se intercala entre dicho plano (1) y el circuito impreso (3) del dispositivo sensor.2. Protective shielding system for inductive sensors, according to the first claim, characterized in that the electrical connection between the plane (1) and the power supply of the sensor device is established by a spring (4) that is sandwiched between said plane (1) and the printed circuit (3) of the sensor device. 3. Sistema de blindaje protector para sensores inductivos, de acuerdo con las reivindicaciones primera y segunda, caracterizado porque el plano (1) se estructura con una lámina aislante recubierta de cobre por una de las caras, disponiéndose con la cara conductora hacia las bobinas (2) del dispositivo sensor inductivo, respecto de la cual se establece el contacto eléctrico con el circuito impreso (3).3. Protective shielding system for inductive sensors, according to the first and second claims, characterized in that the plane (1) is structured with an insulating sheet covered with copper on one of the faces, arranged with the conductive face towards the coils ( 2) of the inductive sensor device, in respect of which the electrical contact with the printed circuit (3) is established.
ES200700863A 2007-04-02 2007-04-02 PROTECTION SHIELDING SYSTEM FOR INDUCTIVE SENSORS. Expired - Fee Related ES2317777B1 (en)

Priority Applications (1)

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ES200700863A ES2317777B1 (en) 2007-04-02 2007-04-02 PROTECTION SHIELDING SYSTEM FOR INDUCTIVE SENSORS.

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ES200700863A ES2317777B1 (en) 2007-04-02 2007-04-02 PROTECTION SHIELDING SYSTEM FOR INDUCTIVE SENSORS.

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ES2317777B1 ES2317777B1 (en) 2009-11-20

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5561375A (en) * 1994-03-28 1996-10-01 Societe D'applications Generales D'electricite Et De Mecanique Sagem Variable-reluctance absolute-angular-position sensor of the inductive type having a stator with non-constant air gap thickness
US6313624B1 (en) * 1998-11-27 2001-11-06 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Position sensor with integrated signal-conditioning electronics on a printed wiring board
US20040011979A1 (en) * 2001-08-31 2004-01-22 Kazutaka Seo Displacement sensor and solenoid valve driver
US6734665B2 (en) * 2000-09-29 2004-05-11 Balluff Gmbh Inductive sensor having a sensor coil in the form of a structured conductive layer
US6882143B2 (en) * 2002-04-04 2005-04-19 Clymer Technologies, Llc Inductive sensor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5561375A (en) * 1994-03-28 1996-10-01 Societe D'applications Generales D'electricite Et De Mecanique Sagem Variable-reluctance absolute-angular-position sensor of the inductive type having a stator with non-constant air gap thickness
US6313624B1 (en) * 1998-11-27 2001-11-06 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Position sensor with integrated signal-conditioning electronics on a printed wiring board
US6734665B2 (en) * 2000-09-29 2004-05-11 Balluff Gmbh Inductive sensor having a sensor coil in the form of a structured conductive layer
US20040011979A1 (en) * 2001-08-31 2004-01-22 Kazutaka Seo Displacement sensor and solenoid valve driver
US6882143B2 (en) * 2002-04-04 2005-04-19 Clymer Technologies, Llc Inductive sensor

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