DE1147787B - Arrangement for speed measurement by means of eddy currents - Google Patents
Arrangement for speed measurement by means of eddy currentsInfo
- Publication number
- DE1147787B DE1147787B DER28946A DER0028946A DE1147787B DE 1147787 B DE1147787 B DE 1147787B DE R28946 A DER28946 A DE R28946A DE R0028946 A DER0028946 A DE R0028946A DE 1147787 B DE1147787 B DE 1147787B
- Authority
- DE
- Germany
- Prior art keywords
- eddy currents
- arrangement
- speed measurement
- magnets
- speed
- 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.)
- Pending
Links
Classifications
-
- 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
- G01P3/50—Devices characterised by the use of electric or magnetic means for measuring linear speed
- G01P3/505—Devices characterised by the use of electric or magnetic means for measuring linear speed by using eddy currents
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Description
Anordnung zur Geschwindigkeitsmessung mittels Wirbelströmen Die Erfindung betrifft eine Anordnung zur Geschwindigkeitsmessung an linear bzw. drehend bewegten Körpern mittels Wirbelströmen.Arrangement for speed measurement by means of eddy currents The invention relates to an arrangement for measuring the speed of linear or rotating movements Bodies by means of eddy currents.
Die Erzeugung und Messung von Wirbelströmen ist zum Zwecke der Geschwindigkeitsmessung schon bekannt. So werden z. B. bei bekannten Ausführungen Wirbelströme in bewegten, aus leitendem nichtmagnetischem Metall bestehenden Körpern mittels Wechselstrommagneten erzeugt und die entstehenden sekundären magnetischen Wechselfelder mittels Spulen aufgenommen. Diese Anordnungen bedingen das Vorhandensein einer Wechselstromquelle, außerdem ist die abgegebene Spannung eine Wechselspannung. was für viele Zwecke unerwünscht ist. The generation and measurement of eddy currents is for the purpose of speed measurement already known. So z. B. in known designs eddy currents in moving, bodies made of conductive non-magnetic metal by means of alternating current magnets generated and the resulting secondary alternating magnetic fields by means of coils recorded. These arrangements require the presence of an alternating current source, in addition, the voltage output is an alternating voltage. what for many purposes is undesirable.
Es ist auch die Verwendung von Hallgeneratoren bei Geschwindigkeitsmessern bekannt. Abweichend vom Erfindungsgegenstand liegt der Hallgenerator bei den bekannten Ausführungen aber im Feld eines rotierenden Dauermagneten; die abgegebene Spannung ist ebenfalls eine Wechselspannung. There is also the use of Hall generators in speedometers known. Deviating from the subject matter of the invention, the Hall generator is in the known ones But versions in the field of a rotating permanent magnet; the voltage output is also an alternating voltage.
Der Erfindung liegt die Aufgabe zugrunde. eine Anordnung zur Geschwindigkeitsmessung unter Anwendung des Wirbelstromprinzips zu schaffen, die in der Lage ist, direkt eine der Meßgröße proportionale Gleichspannung abzugeben. Dies wird erfindungsgemäß dadurch erreicht, daß Hallgeneratoren relativ ortsfest zu Magneten so angeordnet sind, daß sie von dem durch die Wirbelströme entstandenen Feld durchsetzt werden. The invention is based on the object. an arrangement for speed measurement using the eddy current principle to create that is able to directly to output a direct voltage proportional to the measured variable. This is according to the invention achieved by the fact that Hall generators are arranged in a relatively stationary manner with respect to magnets are that they are penetrated by the field created by the eddy currents.
Die Erfindung wird nachfolgend an Hand von Zeichnungen beschrieben. In Bild 1 sind zwei Magneten 1 und 2 (Permanent- oder Elektromagneten) zu einer leitenden Scheibe 3 so angeordnet, daß die durch die Magneten 1 und 2 erzeugte Induktion 23 die Scheibe 3 senkrecht durchsetzt. Tritt nun eine Relativbewegung b zwischen Scheibe 3 und Magneten 1 und 2 in Richtung der Scheibenebene auf, wird bekanntlich in der Scheibe 3 eine elektrische Spannung(F hervorgerufen. Sie hat die Größe: Unter der Einwirkung von C treten nun - wie bereits bekannt - in der Scheibe 3 Wirbelströme Jj bzw. J auf. Der Einfachheit halber sei im folgenden nur der Wirbelstrom J betrachtet. Er ist - abgesehen von Phasenverschiebungen durch die induktive Komponente des Stromkreises von J1 - proportional und phasengleich zu (E j und ruft eine ihm proportionale Induktion t' hervor.The invention is described below with reference to drawings. In Figure 1, two magnets 1 and 2 (permanent or electromagnets) are arranged to form a conductive disk 3 in such a way that the induction 23 generated by the magnets 1 and 2 penetrates the disk 3 vertically. If a relative movement b now occurs between disk 3 and magnets 1 and 2 in the direction of the disk plane, it is known that an electrical voltage (F is produced in disk 3. It has the size: As is already known, eddy currents Jj and J occur in disk 3 under the action of C. For the sake of simplicity, only the eddy current J is considered in the following. Apart from phase shifts due to the inductive component of the circuit of J1, it is proportional and in phase with (E j and produces an induction t 'proportional to it.
Eine Möglichkeit, die Induktion t;' zu messen, be steht darin, sie einen Hallgenerator 4 durchsetzen zu lassen, der keine Relativbewegung zu den Magne- ten 1, 2 aufweist. Bei konstantem Steuerstrom Jsf des Hallgenerators 4 ist die Hallspannung Un: Die Halispannung Un ist also der Geschwindigkeit U der Scheibe 3 in ihrer Ebene proportional; die Anordnung stellt also einen elektrischen Geschwindigkeitsmesser dar.One way to induce t; ' To measure, it consists in letting a Hall generator 4 pass through, which has no relative movement to the magnets 1, 2. With a constant control current Jsf of the Hall generator 4, the Hall voltage Un is: The Halis voltage Un is therefore proportional to the speed U of the disk 3 in its plane; the arrangement thus represents an electric speedometer.
Einen elektrischen Wegniesser erhält man bekanntlich durch Integration der Geschwindigkeit über die Zeit, hier also von Un über die Zeit t. Der in Richtung von U zurückgelegte Weg s wird: Analog erhält man bekanntlich durch Differenzieren nach der Zeit die Beschleunigung.As is well known, an electrical path indicator is obtained by integrating the speed over time, in this case Un over time t. The distance s covered in the direction of U becomes: As is well known, the acceleration is obtained analogously by differentiating according to time.
Die beschriebene Anordnung ist nicht nur zur Messung von Lineargeschwindigkeiten, sondern auch zur Messung von Winkelgeschwindigkeiten bzw. The arrangement described is not only for measuring linear velocities, but also for measuring angular velocities or
Drehzahlen geeignet.Speeds suitable.
In Bild 2 ist ein Drehzahlmeßgerät beispielhaft schematisch dargestellt. Eine Welle 5 ist in den beiden Lagerböcken 6 und 7 drehbar gelagert. Sie trägt an einem Ende eine Scheibe 8 aus leitendem Material, die sich bei einer Drehung der Welle 5 in dem Feld eines Magneten 9 bewegt. Der Hallgenerator 10 dient zur Messung der sich hierbei einstellenden Wirbelströme. Die Hallspannung Un ist der Drehzahl der Welle proportional. Vielfältige Kombinationen von Magneten und Hallgeneratoren sind möglich. A speed measuring device is shown schematically as an example in Figure 2. A shaft 5 is rotatably mounted in the two bearing blocks 6 and 7. She wears on one end is a disk 8 made of conductive material, which when the Shaft 5 moved in the field of a magnet 9. The Hall generator 10 is used for measurement the resulting eddy currents. The Hall voltage Un is the speed proportional to the wave. Various combinations of magnets and Hall generators are possible.
Das Drelzzahlmeßgerät entsprechend Bild 2 hat zwei besondere Vorteile: Es arbeitet berührungslos und deshalb, insbesondere im Vergleich mit Drehzahlmeßgeräten, die mit Schleifringen ausgerüstet sind, ohne Verschleiß und ohne Wartung; es liefert eine der Drehzahl proportionale, sich trägheitsarm einstellende Gleichspannung; es ist also auch zur Messung sich schnell verändernder Drehzahlen geeignet. The Drelz number measuring device according to Figure 2 has two special advantages: It works without contact and therefore, especially in comparison with speed measuring devices, which are equipped with slip rings, without wear and without maintenance; it delivers a DC voltage proportional to the speed and with low inertia; it is therefore also suitable for measuring rapidly changing speeds.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DER28946A DE1147787B (en) | 1960-10-22 | 1960-10-22 | Arrangement for speed measurement by means of eddy currents |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DER28946A DE1147787B (en) | 1960-10-22 | 1960-10-22 | Arrangement for speed measurement by means of eddy currents |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1147787B true DE1147787B (en) | 1963-04-25 |
Family
ID=7402872
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DER28946A Pending DE1147787B (en) | 1960-10-22 | 1960-10-22 | Arrangement for speed measurement by means of eddy currents |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1147787B (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1203505B (en) * | 1963-10-19 | 1965-10-21 | Siemens Ag | Device for measuring and / or monitoring rotational speeds |
DE1214910B (en) * | 1964-04-15 | 1966-04-21 | Siemens Ag | Arrangement for recording speed differences between wheel and rail in rail vehicles |
DE1245185B (en) * | 1964-10-07 | 1967-07-20 | Philips Patentverwaltung | Arrangement for the target / actual value comparison of rotational or translational movements |
US3440532A (en) * | 1965-05-07 | 1969-04-22 | Skinner Precision Ind Inc | Speed sensor for linear induction motors |
DE1297920B (en) * | 1965-05-24 | 1969-06-19 | Siemens Ag | Tachometer generator for measuring the feed speed of a belt moving in its longitudinal direction |
US3775684A (en) * | 1970-01-16 | 1973-11-27 | L Hoodwin | Accelerometer |
US4441077A (en) * | 1981-11-23 | 1984-04-03 | International Business Machines | Real time eddy current responsive Hall effect device tachometer |
EP3330719A1 (en) * | 2016-11-30 | 2018-06-06 | Siemens Rail Automation S.A.U. | System and method for measuring the speed of a guided vehicle |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2460115A (en) * | 1946-06-18 | 1949-01-25 | Gen Electric | Rotation rate change generator |
DE870919C (en) * | 1941-01-31 | 1953-03-19 | Aeg | Speedometer machine |
DE888476C (en) * | 1942-02-15 | 1953-09-03 | Askania Werke Ag | Accelerometer |
DE923578C (en) * | 1953-07-11 | 1955-02-17 | Siemens Ag | Device for mapping a speed as a frequency of a voltage or a current |
DE926885C (en) * | 1953-09-17 | 1955-04-25 | Siemens Ag | Device for mapping a speed as a frequency of a voltage or a current |
DE942663C (en) * | 1954-05-14 | 1956-05-03 | Siemens Ag | Device for detecting mechanical vibrations, in particular accelerations, of vehicles, lifts and other moving bodies |
-
1960
- 1960-10-22 DE DER28946A patent/DE1147787B/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE870919C (en) * | 1941-01-31 | 1953-03-19 | Aeg | Speedometer machine |
DE888476C (en) * | 1942-02-15 | 1953-09-03 | Askania Werke Ag | Accelerometer |
US2460115A (en) * | 1946-06-18 | 1949-01-25 | Gen Electric | Rotation rate change generator |
DE923578C (en) * | 1953-07-11 | 1955-02-17 | Siemens Ag | Device for mapping a speed as a frequency of a voltage or a current |
DE926885C (en) * | 1953-09-17 | 1955-04-25 | Siemens Ag | Device for mapping a speed as a frequency of a voltage or a current |
DE942663C (en) * | 1954-05-14 | 1956-05-03 | Siemens Ag | Device for detecting mechanical vibrations, in particular accelerations, of vehicles, lifts and other moving bodies |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1203505B (en) * | 1963-10-19 | 1965-10-21 | Siemens Ag | Device for measuring and / or monitoring rotational speeds |
DE1214910B (en) * | 1964-04-15 | 1966-04-21 | Siemens Ag | Arrangement for recording speed differences between wheel and rail in rail vehicles |
DE1245185B (en) * | 1964-10-07 | 1967-07-20 | Philips Patentverwaltung | Arrangement for the target / actual value comparison of rotational or translational movements |
US3440532A (en) * | 1965-05-07 | 1969-04-22 | Skinner Precision Ind Inc | Speed sensor for linear induction motors |
DE1297920B (en) * | 1965-05-24 | 1969-06-19 | Siemens Ag | Tachometer generator for measuring the feed speed of a belt moving in its longitudinal direction |
US3775684A (en) * | 1970-01-16 | 1973-11-27 | L Hoodwin | Accelerometer |
US4441077A (en) * | 1981-11-23 | 1984-04-03 | International Business Machines | Real time eddy current responsive Hall effect device tachometer |
EP3330719A1 (en) * | 2016-11-30 | 2018-06-06 | Siemens Rail Automation S.A.U. | System and method for measuring the speed of a guided vehicle |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE1138240B (en) | Transducer | |
DE2745880C2 (en) | ||
DE1147787B (en) | Arrangement for speed measurement by means of eddy currents | |
DE3880639T2 (en) | Bearing with magnetic field detector. | |
DE933173C (en) | Test device, especially for electric traction vehicles, to display the rotary movement of a shaft | |
DE1773149A1 (en) | Device for indicating the direction of rotation of drives | |
DE340841C (en) | Speedometer based on the acceleration principle | |
DE926885C (en) | Device for mapping a speed as a frequency of a voltage or a current | |
DE1266033B (en) | Device for analog measurement of rotational speeds | |
DE590951C (en) | Equipment for the protection of massive components in the area of the stator frontal stray field of multi-phase AC machines against eddy current losses | |
DE815707C (en) | Eddy current meter | |
DE1673439A1 (en) | Eddy current speedometer with constant field excitation | |
DE868503C (en) | Safety device for the conveyor basket loading | |
DE640222C (en) | Measuring device for vehicles to display the braking distance | |
DE739775C (en) | Device for the electrical reproduction of motion states of a rotating shaft | |
DE577123C (en) | Device for speed measurement | |
DE423974C (en) | Device for displaying the specific gas or liquid consumption in vehicles | |
DE389713C (en) | Eddy current speedometer | |
DE1249575B (en) | ||
DE1943701A1 (en) | Device for speed control for separators | |
DE219021C (en) | ||
DE508280C (en) | Eddy current tachometer | |
DE365842C (en) | Speedometer based on the acceleration principle | |
DE463097C (en) | Device for displaying the ratio of the fuel consumption of vehicles or engines to the speed | |
DE7142348U (en) | TOUCHLESS SPEED METER |