DE10325943A1 - Electromagnetic force measurement instrument e.g. for measurement in components, has two spacers being variable to each other and arranged as stops - Google Patents
Electromagnetic force measurement instrument e.g. for measurement in components, has two spacers being variable to each other and arranged as stops Download PDFInfo
- Publication number
- DE10325943A1 DE10325943A1 DE2003125943 DE10325943A DE10325943A1 DE 10325943 A1 DE10325943 A1 DE 10325943A1 DE 2003125943 DE2003125943 DE 2003125943 DE 10325943 A DE10325943 A DE 10325943A DE 10325943 A1 DE10325943 A1 DE 10325943A1
- Authority
- DE
- Germany
- Prior art keywords
- measuring device
- force measuring
- force
- legs
- connecting element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 125000006850 spacer group Chemical group 0.000 title abstract 2
- 238000005259 measurement Methods 0.000 title description 12
- 239000012811 non-conductive material Substances 0.000 claims abstract description 4
- 239000004020 conductor Substances 0.000 claims abstract description 3
- 239000000919 ceramic Substances 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000010409 thin film Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000005060 rubber Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000010792 warming Methods 0.000 claims description 2
- 239000012799 electrically-conductive coating Substances 0.000 claims 1
- 238000000691 measurement method Methods 0.000 claims 1
- 230000003068 static effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 239000005068 cooling lubricant Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000005291 magnetic effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000028161 membrane depolarization Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
Abstract
Description
Die Erfindung betrifft eine elektromagnetische Kraftmesseinrichtung gemäß dem Oberbegriff des Anspruchs 1.The The invention relates to an electromagnetic force measuring device according to the preamble of Claim 1.
Stand der TechnikState of technology
Bisher kommen zur Messung von Kräften drei verschiedene Grundprinzipien zur Anwendung:So far come to measure forces three different basic principles for application:
1. Messung der elastischen, kraftproportionalen Dehnung einer belasteten Struktur durch Dehnmessstreifen.1. measurement of elastic, Force-proportional stretching of a loaded structure using strain gauges.
Nachteile:Disadvantage:
- • Zur Kompensation der Temperaturdehnung in der Messung werden Dehnmessstreifen zu Widerstandsbrücken zusammengeschaltet. Die Temperaturdehnung muss dafür an einer unbelasteten Stelle der Grundstruktur gemessen werden, an der dieselbe Erwärmung auftritt wie an der Messstelle. Meist werden hierfür Dehnmessstreifen senkrecht zur zu messenden Belastungsrichtung aufgeklebt. Durch Querkräfte oder Torsion wird die Messung verfälscht, weil die dadurch auftretende elastische Verformung am Referenzmesspunkt zusätzlich zu der thermischen Dehnung gemessen wird.• To Compensation of the temperature expansion in the measurement are strain gauges to resistance bridges connected together. The temperature expansion must be at one unloaded point of the basic structure are measured at the same warming occurs like at the measuring point. Usually strain gauges are used for this glued perpendicular to the load direction to be measured. By transverse forces or torsion, the measurement is falsified because the resultant elastic deformation measured at the reference measuring point in addition to the thermal expansion becomes.
- • Da Dehnmessstreifen nur die Komponente der Dehnung in ihrer Längsrichtung messen, führen Winkeltoleranzen bei der Applikation zu Messfehlern.• There Strain gauges only the component of the elongation in their longitudinal direction measure, lead angular tolerances in the application of measurement errors.
- • Die Klebung von Dehnmessstreifen ist sehr fehleranfällig. Unter Einfluss von feuchtwarmer Atmosphäre evtl. in Verbindung mit aggressiven Kühlschmiermitteln, die die Klebeverbindung angreift, besteht die Gefahr der Ablösung.• The Adhesion of strain gauges is very prone to errors. Under the influence of moist warmer the atmosphere possibly in connection with aggressive cooling lubricants, the adhesive connection attacks, there is a risk of detachment.
- • Im Fall der Überlastung, wie sie z. B. bei Werkzeugbruch auftreten kann, besteht die Gefahr einer Beschädigung der Messapparatur.• In the Case of overload, as they e.g. B. can occur when the tool breaks, there is a risk damage the measuring apparatus.
- • Wegen der aufwendigen Herstellung sind die Kosten für ein Kraftmesselement nach dem Dehnmessstreifenprinzip sehr hoch.• Because of the cost of a force measuring element is based on the complex production the strain gauge principle very high.
2. Messung der verformungsabhängigen elektrischen Spannung über ein Piezokeramik-Element.2. Measurement of the deformation-dependent electrical Tension over a piezoceramic element.
Nachteile:Disadvantage:
- • Mit piezokeramischen Messelementen können statische Kräfte nicht gemessen werden, da aufgrund eines Ladungsausgleichs die Messspannung bei statischer Belastung mit der Zeit abnimmt. Besonders bei feuchtwarmer Umgebung macht sich eine Ladungsdrift unangenehm bemerkbar.• With Piezoceramic measuring elements can be static personnel cannot be measured because the measuring voltage is due to a charge balance decreases with time with static load. Especially when it's warmer A charge drift is noticeably noticeable in the environment.
- • Piezokeramische Messelemente sind empfindlich gegen Scher-, Torsions- und Biegebeanspruchung. Deshalb ist es notwendig, sie durch konstruktive Maßnahmen gegen solche Beanspruchungen zu schützen. Bei höchsten Belastungen erfolgt eine Depolarisation.• Piezoceramic Measuring elements are sensitive to shear, torsion and bending stress. Therefore it is necessary to take constructive measures to protect against such stresses. At highest loads a depolarization.
3. Messung der kraftproportionalen Längenänderung einer belasteten Feder.3. Measurement of the force proportional Change in length one loaded spring.
Nachteile:Disadvantage:
- • Die Kraftauflösung ist durch die Wegauflösung der Längenmessung begrenzt. Die verwendeten Federn müssen so weich sein, dass sie bei Belastung eine messbare Verformung aufweisen. In vielen technischen Anwendungen ist allerdings nur eine sehr geringe Elastizität des Kraftmesselements zugelassen, da Kräfte hochdynamisch gemessen werden sollen. Mit dieser Methode werden vor allem statische Kräfte gemessen (Federwaage).• The Load resolution is due to the path resolution length measurement limited. The springs used must be so soft that they have a measurable deformation under load. In many technical Applications, however, is only a very low elasticity of the force measuring element admitted because forces to be measured highly dynamically. With this method especially static forces measured (spring balance).
Aufgabe der ErfindungTask of invention
Die Aufgabe der vorliegenden Erfindung besteht in der Schaffung einer einfachen und kompakten elektromagnetischen Kraftmesseinrichtung, wobei eine weitgehend temperaturunabhängige, hochauflösende statische und/oder dynamische Erfassung eines sich örtlich ändernden Magnetfeldes möglich ist.The The object of the present invention is to create a simple and compact electromagnetic force measuring device, being a largely temperature-independent, high-resolution static and / or dynamic detection of a locally changing magnetic field is possible.
Lösung und VorteileSolution and benefits
Die in Anspruch 1 dargestellte Kraftmesseinrichtung funktioniert nach dem unter (3) angegebenen Prinzip.The Force measuring device shown in claim 1 works after the principle given in (3).
Die Kraftmesseinrichtung besteht aus wenigen robusten Bauteilen. Im Unterschied zu rein induktiven Aufnehmern kommt sie ohne ferromagnetische Bauelemente aus.The Force measuring device consists of a few robust components. in the Unlike purely inductive sensors, it comes without ferromagnetic sensors Components.
Mit Hilfe eines Wirbelstromsensors wird die Längenänderung einer Feder gemessen, die bei bekannter Federsteifigkeit proportional zur Kraft ist.With With the help of an eddy current sensor, the change in length of a spring is measured, which is proportional to the force with known spring stiffness.
Aufgrund der hohen Wegauflösung dieser Sensoren können sehr steife Federn gewählt werden, so dass eine hochdynamische Kraftmessung realisiert werden kann. Höherfrequente Kraft- bzw. Druckmessungen können entweder mit einer relativ steifen Feder realisiert werden oder mit einem trägheitsarmen „Anker", z. B. einer metallischen oder metallisierten Membran. Liegt die Eigenfrequenz dieser Membran oberhalb des ausgewählten Frequenzbereichs, so ist eine amplitudenproportionale Messung über den gesamten Frequenzbereich ohne Resonanzüberhöhung zu erwarten.by virtue of the high path resolution of these sensors can very stiff springs selected be so that a highly dynamic force measurement can be realized can. Higher frequency Force or pressure measurements can either be realized with a relatively stiff spring or with a low inertia "anchor", e.g. a metallic one or metallized membrane. Is the natural frequency of this membrane above the selected one Frequency range, is an amplitude proportional measurement over the entire frequency range to be expected without excessive resonance.
Anspruch 7 sieht eine alternative Ausführungsform vor, die im wesentlichen durch einen zweischenkligen (U-förmigen) Grundaufbau charakterisiert ist.Claim 7 provides an alternative embodiment tion form, which is essentially characterized by a two-legged (U-shaped) basic structure.
Die
Wegsensoren in Dünnfilmtechnologie lassen sich sehr preiswert herstellen und aufgrund ihrer geringen Größe mühelos in sehr kleine Kraftsensoren einbauen.displacement sensors in thin film technology can be produced very inexpensively and because of their low Size effortlessly in install very small force sensors.
Die Kraftsensoren sind unempfindlich gegen Querkräfte und Torsion.The Force sensors are insensitive to lateral forces and torsion.
Weiter Vorteile der in den Unteransprüchen genannten Merkmale werden im Rahmen der Beschreibung ersichtlich.Further Advantages of those mentioned in the subclaims Features become apparent in the context of the description.
Zeichnungendrawings
Zwei Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:Two embodiments the invention are illustrated in the drawings and in the following Description closer explained. Show it:
Beschreibungdescription
Wie
aus den
Das
nichtleitfähige
Endglied
Das
Verbindungselement
Die
- 2, 2'2, 2 '
- KraftmesseinrichtungForce measuring device
- 4, 64, 6
- Endgliederend links
- 44
- elektrisch leitfähiges Endglied, Metallscheibeelectrical conductive End link, metal disc
- 66
- Endglied aus nichtleitfähiges Material, Keramikscheibeend link from non-conductive Material, ceramic disc
- 88th
- Verbindungselement, Feder, ringförmige ScheibeConnecting element, Feather, annular disc
- 1010
- WirbelstromsensorEddy current sensor
- 1212
- U-förmiges BauteilU-shaped component
- 12a, 12b12a, 12b
- Schenkel des U-förmigen Bauteilsleg of the U-shaped component
- 12c12c
- Basis des U-förmigen BauteilsBase of the U-shaped component
- 1414
- metallische Beschichtungmetallic coating
- FF
- Kraftrichtungdirection of force
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003125943 DE10325943A1 (en) | 2003-06-07 | 2003-06-07 | Electromagnetic force measurement instrument e.g. for measurement in components, has two spacers being variable to each other and arranged as stops |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003125943 DE10325943A1 (en) | 2003-06-07 | 2003-06-07 | Electromagnetic force measurement instrument e.g. for measurement in components, has two spacers being variable to each other and arranged as stops |
Publications (1)
Publication Number | Publication Date |
---|---|
DE10325943A1 true DE10325943A1 (en) | 2004-12-30 |
Family
ID=33482698
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2003125943 Withdrawn DE10325943A1 (en) | 2003-06-07 | 2003-06-07 | Electromagnetic force measurement instrument e.g. for measurement in components, has two spacers being variable to each other and arranged as stops |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE10325943A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016109433A1 (en) * | 2016-05-23 | 2017-11-23 | Minebea Intec GmbH | force sensor |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4420691C1 (en) * | 1994-06-14 | 1996-01-18 | Bizerba Gmbh & Co Kg | Force measurement cell esp. for use in weighing balances |
DE10132922A1 (en) * | 2001-07-06 | 2003-01-30 | Bosch Gmbh Robert | Deformation sensor for use in triggering a motor vehicle side impact air bag, comprises a resonating box that when compressed is de-tuned so that a resonance signal is lost |
-
2003
- 2003-06-07 DE DE2003125943 patent/DE10325943A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4420691C1 (en) * | 1994-06-14 | 1996-01-18 | Bizerba Gmbh & Co Kg | Force measurement cell esp. for use in weighing balances |
DE10132922A1 (en) * | 2001-07-06 | 2003-01-30 | Bosch Gmbh Robert | Deformation sensor for use in triggering a motor vehicle side impact air bag, comprises a resonating box that when compressed is de-tuned so that a resonance signal is lost |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016109433A1 (en) * | 2016-05-23 | 2017-11-23 | Minebea Intec GmbH | force sensor |
DE102016109433B4 (en) | 2016-05-23 | 2018-03-01 | Minebea Intec GmbH | force sensor |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0776466B1 (en) | Force or extension sensor | |
EP0237598B1 (en) | Piezoresistive force-measuring element and its use in determining the forces acting upon a construction | |
EP2715300B1 (en) | Sensor for measuring pressure and/or force | |
DE10310392A1 (en) | Sensor for determining strain, has structured resistance tracks, and additional piezoelectric strain-sensitive materially applied to carrier layer or spring material | |
EP0783677A1 (en) | Testable membrane sensor with two full bridges | |
EP0478737B1 (en) | Device for measuring acceleration via piezoelectric transducers | |
EP3370051A2 (en) | Pressure sensor and a method of measuring the pressure | |
EP0190270A1 (en) | Transducer for the electrical measurement of forces, torques, accelerations, pressures and mechanical stresses. | |
DE3218577C2 (en) | ||
DE1932899A1 (en) | Resistance transducer for forces loads, - pressures | |
DE102011007350B4 (en) | Sensor for the tactile measurement of forces and moments | |
DD276152A5 (en) | TWO-SIDED PRESSURE SENSOR | |
DE102016204557A1 (en) | Sensor device, measuring device, motor vehicle and method for detecting a current deformation of a component | |
DE102004008432A1 (en) | Strain gauge for recording expansions or compressions on deformation elements | |
DE10325943A1 (en) | Electromagnetic force measurement instrument e.g. for measurement in components, has two spacers being variable to each other and arranged as stops | |
DE102011106694A1 (en) | Pressure Transmitter | |
DE2433223A1 (en) | Dynamometer operating by measurement of sensor deformation - has test grid delivering test values as functions of strain | |
EP2720021B1 (en) | Force measuring device | |
DE10058498C2 (en) | Device for determining the torsional moment and the axial force in torsion tests on thin fibers | |
DE3330879A1 (en) | Electromechanical sensor for force measurement | |
DE102012219203B3 (en) | Device for force- or displacement measurement, has two meander arrangements connected to each other by coupling piece to form parallel spring arrangement, where each meander arrangement has neutral silicon springs and active silicon springs | |
EP1145025B1 (en) | Capacitive magnetic field sensor | |
EP3676560A1 (en) | Strain gauge device | |
DE19921174A1 (en) | Strain gauge sensor | |
CH640048A5 (en) | Strainometer |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
8139 | Disposal/non-payment of the annual fee |