GB1164344A - Overspeed Shutdown System for Centrifuge Apparatus. - Google Patents

Overspeed Shutdown System for Centrifuge Apparatus.

Info

Publication number
GB1164344A
GB1164344A GB24042/67A GB2404267A GB1164344A GB 1164344 A GB1164344 A GB 1164344A GB 24042/67 A GB24042/67 A GB 24042/67A GB 2404267 A GB2404267 A GB 2404267A GB 1164344 A GB1164344 A GB 1164344A
Authority
GB
United Kingdom
Prior art keywords
transistor
rotor
speed
signal
filter
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
GB24042/67A
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.)
Beckman Coulter Inc
Original Assignee
Beckman Instruments Inc
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 Beckman Instruments Inc filed Critical Beckman Instruments Inc
Publication of GB1164344A publication Critical patent/GB1164344A/en
Expired legal-status Critical Current

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
    • G01P3/56—Devices characterised by the use of electric or magnetic means for comparing two speeds
    • G01P3/60—Devices characterised by the use of electric or magnetic means for comparing two speeds by measuring or comparing frequency of generated currents or voltages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B13/00—Control arrangements specially designed for centrifuges; Programme control of centrifuges
    • B04B13/003—Rotor identification systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/093—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against increase beyond, or decrease below, a predetermined level of rotational speed

Abstract

1,164,344. Control of centrifuges. BECKMAN INSTRUMENTS, Inc. 24 May, 1967 [29 July, 1966], No. 24042/67. Heading B2P. [Also in Divisions G1 and H2] A centrifuge having changeable rotors of different speed ratings is associated with an overspeed shutdown system in which a signal having a frequency proportional to rotor speed is compared with a standard frequency signal. A filter responds to a predetermined minimum difference frequency signal to provide a shutdown trigger signal. The rotor is fitted with a disc having alternate reflective and non- reflective sectors co-operating with a light source and a photo-transistor 17 connected to a limiter amplifier 18, comprising a breakdown diode D1, for producing a periodic waveform related to the speed of the rotor. Limiter 18 is coupled to an overspeed demodulator 19 comprising transistor Q1 which also receives a standard frequency signal from an oscillator, comprising transistors Q3, Q4, connected to quartz crystal 22 and to a frequency divider including transistors Q5, Q6. A low pass filter 23 responds to a predetermined minimum difference frequence from the demodulator 19 to'actuate a silicon controlled rectifier 24 for shutting down the centrifuge. An auxiliary acceleration circuit (not shown) produces initial rotation of the centrifuge, a signal from amplifier 18 energising a demodulator 20, comprising transistor Q2, so that relay 29 closes the circuit of the driving motor provided that the circuit components are functioning properly. As the rotor approaches full speed, the difference frequence has a high value and the filter 23 has no output. If the speed becomes excessive, however, the filter senses a low difference frequency to actuate the rectifier 24, so earthing the collector of transistor 33 and shutting down the drive system.
GB24042/67A 1966-07-29 1967-05-24 Overspeed Shutdown System for Centrifuge Apparatus. Expired GB1164344A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US56884166A 1966-07-29 1966-07-29

Publications (1)

Publication Number Publication Date
GB1164344A true GB1164344A (en) 1969-09-17

Family

ID=24272958

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24042/67A Expired GB1164344A (en) 1966-07-29 1967-05-24 Overspeed Shutdown System for Centrifuge Apparatus.

Country Status (3)

Country Link
US (1) US3436637A (en)
DE (1) DE1588066C3 (en)
GB (1) GB1164344A (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3623060A (en) * 1969-01-03 1971-11-23 Acme Visible Records Inc Motion detector
US3488571A (en) * 1969-01-21 1970-01-06 Sony Corp Speed control apparatus utilizing voltage and frequency signals
US3582699A (en) * 1969-06-12 1971-06-01 Damon Eng Inc Overspeed control for centrifuge
JPS5629050Y2 (en) * 1973-03-14 1981-07-10
US3921047A (en) * 1973-04-02 1975-11-18 Beckman Instruments Inc Overspeed protection system for centrifuge apparatus
US4086564A (en) * 1975-05-27 1978-04-25 The Firestone Tire & Rubber Company Electronic alarm circuitry
US4054819A (en) * 1975-11-13 1977-10-18 Sperry Rand Corporation Motor angular velocity monitor circuit
US4278969A (en) * 1977-08-29 1981-07-14 Reli Corporation Driver warning system
US4284931A (en) * 1979-03-14 1981-08-18 Beckman Instruments, Inc. Overspeed shutdown system for centrifuge apparatus
DD200111A1 (en) * 1981-07-06 1983-03-16 Horst Kache CIRCUIT ARRANGEMENT FOR SPEED MONITORING
US4507110A (en) * 1983-10-20 1985-03-26 E. I. Du Pont De Nemours And Company Adjustable photosensor mounting arrangement for a centrifuge
EP0232324A1 (en) * 1985-08-09 1987-08-19 Beckman Instruments, Inc. Overspeed protection signal override system for a centrifuge apparatus
US4827197A (en) * 1987-05-22 1989-05-02 Beckman Instruments, Inc. Method and apparatus for overspeed protection for high speed centrifuges
US5235864A (en) * 1990-12-21 1993-08-17 E. I. Du Pont De Nemours And Company Centrifuge rotor identification system based on rotor velocity
US5926387A (en) * 1995-06-30 1999-07-20 Beckman Instruments, Inc. Ultracentrifuge operation by computer system
JP3879360B2 (en) * 2000-03-17 2007-02-14 日立工機株式会社 Centrifuge
US6350224B1 (en) * 2000-07-17 2002-02-26 Westinghouse Savannah River Company, Llc Centrifugal unbalance detection system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3258669A (en) * 1966-06-28 Variable width fulse-fed micromotor control system
US2809339A (en) * 1955-05-06 1957-10-08 Westinghouse Electric Corp Motor control circuit
US3138357A (en) * 1960-07-13 1964-06-23 James Scott Electronic Enginee Gantry crane safety device
NL272719A (en) * 1960-12-20

Also Published As

Publication number Publication date
DE1588066B2 (en) 1973-05-30
US3436637A (en) 1969-04-01
DE1588066C3 (en) 1973-12-13
DE1588066A1 (en) 1970-11-12

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees