EP0082956B1 - Einrichtung zur berührungslosen Unwuchtmessung - Google Patents

Einrichtung zur berührungslosen Unwuchtmessung Download PDF

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Publication number
EP0082956B1
EP0082956B1 EP82110802A EP82110802A EP0082956B1 EP 0082956 B1 EP0082956 B1 EP 0082956B1 EP 82110802 A EP82110802 A EP 82110802A EP 82110802 A EP82110802 A EP 82110802A EP 0082956 B1 EP0082956 B1 EP 0082956B1
Authority
EP
European Patent Office
Prior art keywords
sensor
rotor
magnetic field
gap
centrifuge
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.)
Expired
Application number
EP82110802A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0082956A1 (de
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/de
Application granted granted Critical
Publication of EP0082956B1 publication Critical patent/EP0082956B1/de
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 non-contact unbalance measurement on centrifuges and the like, in particular on ultracentrifuges, with a magnetic field sensor arranged on the fixed part of the centrifuge in the vicinity of an annular part rotating with the rotor for detecting the changes in the geometry of the gap resulting from deflection movements of the rotor shaft between the ring-shaped part and the sensor.
  • a permanent magnet is attached to the centrifuge rotor, the magnetic field of which is detected by a coil arranged on the fixed housing. Deflection of the rotor during centrifugation results in a corresponding change in the detected field, which can thus be used for monitoring.
  • the arrangement of a permanent magnet on the upper part of the rotor is hardly possible in this or a similar form in a modern ultracentrifuge.
  • the arrangement is relatively complex if high precision is required.
  • GB-A641 732 shows a device for measuring the eccentricity of rotating shafts.
  • the field change of a permanent magnet with a coil caused by a change in an air gap is measured.
  • the monitored gap should be on the largest possible circumference of the rotating part.
  • the arrangement of the monitoring device on a circumference of the rotor is in terms of structural complexity, precision and handling of the device, for. B. unfavorable when replacing the rotors.
  • the object of the invention was therefore to provide a contactless unbalance measurement on centrifuges, which requires relatively little material and labor in the manufacture, detects an unbalance with high precision and does not interfere with the handling of the device.
  • this is achieved by a device of the type mentioned at the outset, in which the annular part rotating with the rotor has an annular flat end face which lies in a plane perpendicular to the centrifuge axis and which is opposite the magnetic field sensor in order to provide for the between the end face and the sensor Define the measured gap.
  • 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-shaped or flange-shaped part 3 made of soft iron is formed on this adapter 2, which is referred to below as the measuring flange.
  • the measuring flange can also be arranged on the rotor 5 (not shown).
  • 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 both field plates are mounted are eliminated 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 sensor Since the displacement of the measuring flange 3 relative to the differential sensor 6 takes place in the direction perpendicular to the axis, the sensor is arranged such that the two field plates 7, 8 lie one behind the other in the radial direction to the axis.
  • 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 magnetic field-dependent resistors are arranged in a bridge circuit 10, from which an output signal is generated in a known manner with the aid of a suitable amplifier 11.
  • 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 devices for determining the unbalance in a centrifuge which are based on the principle of contact of a ball-bearing ring through the axis, are digital sensors: a signal is emitted at a certain critical deflection. Due to the mechanical construction, the sensitivity, i.e. H. to vary 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.
  • the following measures are provided in the circuit to switch over the response sensitivity of the unbalance measurement:
  • the amplifier 11 is followed by a comparator 12, to which the output signal of the amplifier is fed and whose reference input can be changed as a function of the speed.
  • a warning signal is emitted at the signal output 13.
  • the signal available at the output of the amplifier 11 can also be processed further via a microprocessor.

Landscapes

  • Testing Of Balance (AREA)
  • Centrifugal Separators (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (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 Cycles, And Cycles In General (AREA)
  • Processing Of Solid Wastes (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Automatic Analysis And Handling Materials Therefor (AREA)
  • Optical Measuring Cells (AREA)
EP82110802A 1981-12-24 1982-11-23 Einrichtung zur berührungslosen Unwuchtmessung Expired EP0082956B1 (de)

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
CH828481 1981-12-24
CH8284/81 1981-12-24

Publications (2)

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

Family

ID=4337959

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82110802A Expired EP0082956B1 (de) 1981-12-24 1982-11-23 Einrichtung zur berührungslosen Unwuchtmessung

Country Status (10)

Country Link
US (1) US4491019A (da)
EP (1) EP0082956B1 (da)
JP (2) JPS58118938A (da)
AT (1) ATE17928T1 (da)
AU (1) AU542725B2 (da)
CA (1) CA1194709A (da)
DE (1) DE3269101D1 (da)
DK (1) DK571382A (da)
ES (1) ES8400822A1 (da)
NO (1) NO156844C (da)

Families Citing this family (19)

* 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
JPH0726669B2 (ja) * 1988-09-09 1995-03-29 日立工機株式会社 回転体の不つりあい検出方法
DE3935616C3 (de) * 1989-10-26 1998-12-24 Sigma Laborzentrifugen Gmbh Vorrichtung zur Überwachung des Betriebes einer Zentrifuge
JPH0418798U (da) * 1990-06-04 1992-02-17
DE4335119C2 (de) * 1993-10-15 1997-11-20 Eppendorf Geraetebau Gmbh Laborzentrifuge mit Unwuchtabschaltung
US5505684A (en) * 1994-08-10 1996-04-09 Piramoon Technologies, Inc. Centrifuge construction having central stator
JP3710001B2 (ja) * 1995-06-16 2005-10-26 日立工機株式会社 遠心分離機
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, 37520 Osterode 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
CA2882451A1 (en) * 2014-02-19 2015-08-19 Marius Cloutier 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

Family Cites Families (7)

* 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
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.
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
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 (da) * 1981-06-01 1982-12-06

Also Published As

Publication number Publication date
AU9166182A (en) 1983-08-04
JPS6324424Y2 (da) 1988-07-05
CA1194709A (en) 1985-10-08
JPS6244232U (da) 1987-03-17
AU542725B2 (en) 1985-03-07
NO156844C (no) 1987-12-02
EP0082956A1 (de) 1983-07-06
NO156844B (no) 1987-08-24
DE3269101D1 (en) 1986-03-27
JPS58118938A (ja) 1983-07-15
DK571382A (da) 1983-06-25
ES517774A0 (es) 1983-11-16
ES8400822A1 (es) 1983-11-16
NO824361L (no) 1983-06-27
US4491019A (en) 1985-01-01
ATE17928T1 (de) 1986-02-15

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