EP0082956A1 - Dispositif de mesure sans contact direct du défaut d'équilibrage - Google Patents

Dispositif de mesure sans contact direct du défaut d'équilibrage Download PDF

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Publication number
EP0082956A1
EP0082956A1 EP82110802A EP82110802A EP0082956A1 EP 0082956 A1 EP0082956 A1 EP 0082956A1 EP 82110802 A EP82110802 A EP 82110802A EP 82110802 A EP82110802 A EP 82110802A EP 0082956 A1 EP0082956 A1 EP 0082956A1
Authority
EP
European Patent Office
Prior art keywords
rotor
sensor
magnetic field
centrifuge
gap
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.)
Granted
Application number
EP82110802A
Other languages
German (de)
English (en)
Other versions
EP0082956B1 (fr
Inventor
Gerhard Wicki
Rolf Näff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cessione kontron Instruments Holding Nv
Original Assignee
Kontron Holding AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kontron Holding AG filed Critical Kontron Holding AG
Priority to AT82110802T priority Critical patent/ATE17928T1/de
Publication of EP0082956A1 publication Critical patent/EP0082956A1/fr
Application granted granted Critical
Publication of EP0082956B1 publication Critical patent/EP0082956B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/14—Balancing rotary bowls ; Schrappers
    • B04B9/146—Unbalance detection devices

Definitions

  • the invention relates to a device for contactless unbalance measurement on centrifuges and the like, in particular on ultracentrifuges.
  • the object of the invention was therefore to provide a non-contact unbalance measurement on centrifuges, which is not very susceptible to faults and requires relatively little material and labor in the manufacture.
  • a magnetic field sensor is arranged on the fixed part of the centrifuge in the vicinity of an annular part of the rotor, which detects changes in the geometry of the gap between the annular part and the sensor caused by deflection and / or precession movements of the rotor shaft.
  • the rotor has a coaxially arranged flange-shaped part, opposite the end of which the sensor is arranged.
  • a magnetic field-dependent resistor or a Hall generator is preferably used as the sensor.
  • the flange-shaped part is preferably made of soft iron.
  • the sensor is a differential sensor.
  • the single figure shows a schematic representation of the essential parts of the rotor and the fixed part of an ultracentrifuge with a device for measuring unbalance according to the invention.
  • a receiving head for the centrifuge rotor is attached to the rotor shaft 1.
  • a ring or flange niger part 3 formed of soft iron which is hereinafter referred to as M essflansch.
  • M essflansch a ring or flange niger part 3 formed of soft iron
  • the M may be arranged also on essflansch (not shown) rotor.
  • the measuring flange 3 has an annular end face 4 which defines a plane perpendicular to the rotor axis.
  • a magnetic field sensor 6 is arranged on the fixed part of the centrifuge at a short distance from the flat end face of the measuring flange 3.
  • the sensor is a differential sensor, consisting of two magnetic field-dependent resistors 7, 8, which are attached to a common permanent magnet 9.
  • Such differential sensors are commercially available components and are available, for example, from Siemens under the type designation FP 210 L 100.
  • other differential sensors made of magnetic field-dependent resistors, as well as individual field plates or arrangements made of Hall generators, can also be used.
  • the measuring flange 3 from permanent magnetic material.
  • the permanent magnet 9 on which the two field plates are mounted would be omitted or replaced by a soft iron plate.
  • the distance referred to as a gap for the purpose of this description between the end face 4 of the measuring flange 3 and the differential sensor 6 is preferably between 0.2 and 0.7 mm.
  • these values are not absolute limit values for the function of the invention.
  • the senor Since the displacement of the measuring flange 3 ifferentialmentler 6 occurs relative to D in the direction perpendicular to the axis, the sensor is arranged so that the two field plates 7 lying one behind the other in the radial direction to the axis. 8
  • the axis is at an angle, during centrifugation there is a precession movement of the axis in addition to the deflection or due to the deflection, which leads to a temporal change in the deflection at the location of the sensor 6 and thus to a temporal change in the resistance values.
  • An inclined rotor axis can result from the fact that the device is not absolutely horizontal or also because the rotor is filled unevenly.
  • the two magnetoresistors are arranged in a bridge circuit 10, is generated from the in known manner by a suitable amplifier 11, a initial angssignal g.
  • the output signal consists of a voltage that is proportional to the deflection in the radial direction of the rotor axis. It is therefore an analog signal, which constitutes a considerable advantage of the device according to the invention.
  • the conventional facilities for Determination of the unbalance in a centrifuge which is based on the principle of a ball-bearing ring touching the axis, is represented by digital sensors: a signal is emitted at a certain critical deflection. Due to the mechanical design, it was not possible to vary the sensitivity, ie the response threshold of the deflection, especially not during operation.
  • the system according to the invention in which an analog signal is generated, makes it possible to change the sensitivity without any problems, even during operation. This is a considerable advantage, because it enables the sensitivity to be selected lower at lower speeds, at which experience has shown greater deflections, but which do not endanger the rotor at these speeds, and at higher speeds when the rotor is self-stabilizing is done to shift up. This ensures that in all cases in which a centrifuge previously switched off, because at relatively low speeds due to critical vibrations deflections that would endanger the rotor at higher speeds, the centrifuge can continue to run if the rotor is above the critical speed stabilized again.
  • a comparator 12 is connected downstream of the amplifier 11, to which the output signal of the amplifier is fed and whose reference input can be changed depending on the speed. As soon as the unbalance measurement signal exceeds the reference voltage V R , a warning signal is emitted at the signal output 13.
  • the signal available at the output of the amplifier 11 can also be via a microphone processor to be processed.

Landscapes

  • Centrifugal Separators (AREA)
  • Testing Of Balance (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Level Indicators Using A Float (AREA)
  • Automatic Analysis And Handling Materials Therefor (AREA)
  • Optical Measuring Cells (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Processing Of Solid Wastes (AREA)
  • Automatic Cycles, And Cycles In General (AREA)
EP82110802A 1981-12-24 1982-11-23 Dispositif de mesure sans contact direct du défaut d'équilibrage Expired EP0082956B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82110802T ATE17928T1 (de) 1981-12-24 1982-11-23 Einrichtung zur beruehrungslosen unwuchtmessung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH8284/81 1981-12-24
CH828481 1981-12-24

Publications (2)

Publication Number Publication Date
EP0082956A1 true EP0082956A1 (fr) 1983-07-06
EP0082956B1 EP0082956B1 (fr) 1986-02-12

Family

ID=4337959

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82110802A Expired EP0082956B1 (fr) 1981-12-24 1982-11-23 Dispositif de mesure sans contact direct du défaut d'équilibrage

Country Status (10)

Country Link
US (1) US4491019A (fr)
EP (1) EP0082956B1 (fr)
JP (2) JPS58118938A (fr)
AT (1) ATE17928T1 (fr)
AU (1) AU542725B2 (fr)
CA (1) CA1194709A (fr)
DE (1) DE3269101D1 (fr)
DK (1) DK571382A (fr)
ES (1) ES517774A0 (fr)
NO (1) NO156844C (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3929792A1 (de) * 1988-09-09 1990-03-15 Hitachi Koki Kk Verfahren zum schuetzen einer rotationsmaschine
EP0648541A2 (fr) * 1993-10-15 1995-04-19 Gerätebau Eppendorf GmbH Centrifugeuse pour laboratoire s'arrêtant en cas de déséquilibre
US5738622A (en) * 1995-06-16 1998-04-14 Hitachi Koki Co., Ltd. Centrifugal separator and a method of detecting unbalance of a rotor

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4700117A (en) * 1985-05-31 1987-10-13 Beckman Instruments, Inc. Centrifuge overspeed protection and imbalance detection system
DE3935616C3 (de) * 1989-10-26 1998-12-24 Sigma Laborzentrifugen Gmbh Vorrichtung zur Überwachung des Betriebes einer Zentrifuge
JPH0418798U (fr) * 1990-06-04 1992-02-17
US5505684A (en) * 1994-08-10 1996-04-09 Piramoon Technologies, Inc. Centrifuge construction having central stator
DE19701551C1 (de) * 1997-01-17 1998-08-06 Fresenius Ag Einrichtung zum Detektieren einer Unwucht an einem Rotor einer Zentrifuge
DE29712121U1 (de) * 1997-07-10 1997-09-11 Sigma Laborzentrifugen Gmbh Steuerungseinrichtung für eine Laborzentrifuge
US5800331A (en) * 1997-10-01 1998-09-01 Song; Jin Y. Imbalance detection and rotor identification system
JP3968960B2 (ja) * 1999-07-15 2007-08-29 日立工機株式会社 遠心機
US6350224B1 (en) 2000-07-17 2002-02-26 Westinghouse Savannah River Company, Llc Centrifugal unbalance detection system
US6635007B2 (en) * 2000-07-17 2003-10-21 Thermo Iec, Inc. Method and apparatus for detecting and controlling imbalance conditions in a centrifuge system
EP1455436A1 (fr) * 2003-03-05 2004-09-08 Ecole Polytechnique Fédérale de Lausanne (EPFL) Procédé et dispositif de traitement de signaux pour la détection de l'excentricité d'une machine synchrone
DE102005018041B3 (de) * 2005-04-19 2007-01-04 Hanning Elektro-Werke Gmbh & Co. Kg Antriebseinrichtung für eine Laborzentrifuge
DE102011102606A1 (de) 2011-05-27 2012-11-29 Ika-Werke Gmbh & Co. Kg Rührgerät mit einem Rührwerkzeug und mit einem Antriebsmotor
DE102012002891A1 (de) * 2012-02-14 2013-08-14 Hans Heidolph Gmbh & Co. Kg Laborgerät
US20150234011A1 (en) * 2014-02-19 2015-08-20 Vibrosystm Inc. Real time monitoring of rotor or stator shape change for rotating machines
DE102014116527B4 (de) * 2014-11-12 2020-01-23 Andreas Hettich Gmbh & Co. Kg Zentrifuge und Verfahren zur Erfassung von Unwuchten in der Zentrifuge

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB641732A (en) * 1947-09-05 1950-08-16 English Electric Co Ltd Improvements relating to eccentricity measuring instruments
FR1298343A (fr) * 1960-03-17 1962-07-13 Reactor Centrum Nederland Dispositif pour signaler, indiquer, enregistrer et influencer les mouvements de l'axe de rotation et la vitesse de rotation du rotor d'une centrifugeuse

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE571526A (fr) * 1957-10-02 1962-02-23 Licentia Gmbh Dispositif de mesure des mouvements axiaux de l'arbre d'une machine centrifuge, comprenant un organe de translation et un emetteur de la valeur de la translation.
CH516885A (de) * 1970-05-20 1971-12-15 Bbc Brown Boveri & Cie Elektrische Maschine mit einer Einrichtung zur Überwachung des Luftspaltes
US4028524A (en) * 1971-08-06 1977-06-07 The Singer Company Balancing system for a rotating mass
JPS51151568A (en) * 1975-06-20 1976-12-27 Ono Sokki Co Ltd Detector
JPS57192449U (fr) * 1981-06-01 1982-12-06

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB641732A (en) * 1947-09-05 1950-08-16 English Electric Co Ltd Improvements relating to eccentricity measuring instruments
FR1298343A (fr) * 1960-03-17 1962-07-13 Reactor Centrum Nederland Dispositif pour signaler, indiquer, enregistrer et influencer les mouvements de l'axe de rotation et la vitesse de rotation du rotor d'une centrifugeuse

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3929792A1 (de) * 1988-09-09 1990-03-15 Hitachi Koki Kk Verfahren zum schuetzen einer rotationsmaschine
EP0648541A2 (fr) * 1993-10-15 1995-04-19 Gerätebau Eppendorf GmbH Centrifugeuse pour laboratoire s'arrêtant en cas de déséquilibre
DE4335119A1 (de) * 1993-10-15 1995-04-20 Eppendorf Geraetebau Gmbh Laborzentrifuge mit Unwuchtabschaltung
EP0648541A3 (fr) * 1993-10-15 1995-09-20 Eppendorf Geraetebau Gmbh Centrifugeuse pour laboratoire s'arrêtant en cas de déséquilibre.
US5496254A (en) * 1993-10-15 1996-03-05 Gera/ tebau Eppendorf GmbH Lab centrifuge with imbalance shutoff
US5738622A (en) * 1995-06-16 1998-04-14 Hitachi Koki Co., Ltd. Centrifugal separator and a method of detecting unbalance of a rotor

Also Published As

Publication number Publication date
AU9166182A (en) 1983-08-04
JPS6324424Y2 (fr) 1988-07-05
NO156844C (no) 1987-12-02
NO156844B (no) 1987-08-24
NO824361L (no) 1983-06-27
DK571382A (da) 1983-06-25
AU542725B2 (en) 1985-03-07
CA1194709A (fr) 1985-10-08
JPS58118938A (ja) 1983-07-15
EP0082956B1 (fr) 1986-02-12
US4491019A (en) 1985-01-01
ES8400822A1 (es) 1983-11-16
DE3269101D1 (en) 1986-03-27
JPS6244232U (fr) 1987-03-17
ATE17928T1 (de) 1986-02-15
ES517774A0 (es) 1983-11-16

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