GB1504209A - Measurement of motor speed when the supply to the motor is interrupted - Google Patents

Measurement of motor speed when the supply to the motor is interrupted

Info

Publication number
GB1504209A
GB1504209A GB971375A GB971375A GB1504209A GB 1504209 A GB1504209 A GB 1504209A GB 971375 A GB971375 A GB 971375A GB 971375 A GB971375 A GB 971375A GB 1504209 A GB1504209 A GB 1504209A
Authority
GB
United Kingdom
Prior art keywords
motor
signal
speed
supply
frequency
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
GB971375A
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of GB1504209A publication Critical patent/GB1504209A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • B04B9/10—Control of the drive; Speed regulating
    • 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
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/489—Digital circuits therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/343—Testing dynamo-electric machines in operation

Abstract

1504209 Monitoring AC motors SIEMENS AG 7 March 1975 [8 April 1974] 9713/75 Heading G1U A circuit arrangement for monitoring the speed of each A.C. motor of a multiple motor installation and the determination of the speed of an individual motor by measuring the frequency of the regenerated current when the supply is disconnected and the motor terminals short-circuited is described. Current transformers 22-24 are used in one phase of each motor 2-4 provide a signal f 2 sequentially through a pulse shaper 32 to comparator 21 in angle comparison circuit 19. A reference phase signal f from the motor supply is applied through a pulse shaper 20 to comparator 21 so that the phase difference between these signals can be used to produce an output signal #2. The signal #2 is compared with a fixed potential from potentiometer 34 and depending on its level produces an output on line S indicating a synchronous operation or an output on line S2 indicating synchronous operation. The existence of asynchronous operation may be signalled by a visual 35 or audible 36 alarm or the signal applied to data processor 37. The counter 9 sequences the stepping switch 29 and affords an indication of which motors are running asynchronously. The actual speed of each motor may be determined in cases where the power supply fails, e.g. by a malfunction of frequency charger 14, by closing the switch 40 and measuring the frequency of the regenerated current signal detected by the negative current transformer in counter 41.
GB971375A 1974-04-08 1975-03-07 Measurement of motor speed when the supply to the motor is interrupted Expired GB1504209A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742416999 DE2416999C3 (en) 1974-04-08 1974-04-08 Method and circuit arrangement for speed measurement in a drive system

Publications (1)

Publication Number Publication Date
GB1504209A true GB1504209A (en) 1978-03-15

Family

ID=5912436

Family Applications (1)

Application Number Title Priority Date Filing Date
GB971375A Expired GB1504209A (en) 1974-04-08 1975-03-07 Measurement of motor speed when the supply to the motor is interrupted

Country Status (3)

Country Link
DE (1) DE2416999C3 (en)
GB (1) GB1504209A (en)
NL (1) NL7502859A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2168497A (en) * 1984-12-18 1986-06-18 Toshiba Kk Load state detecting apparatus of an induction motor

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH615538A5 (en) * 1977-03-04 1980-01-31 Bbc Brown Boveri & Cie
DE3216006A1 (en) * 1982-04-29 1983-11-10 Siemens AG, 1000 Berlin und 8000 München ARRANGEMENT FOR MONITORING THE LOAD CONDITION AND THE SPEED OF AC OR AC MOTORS, IN PARTICULAR HYSTERESIS MOTORS
DE4322146A1 (en) * 1993-07-02 1995-01-19 Hueller Hille Gmbh Use of an electrical drive for processing spindles and feed shafts on machine tools
DE10106286B4 (en) * 2001-02-02 2004-12-09 Brose Fahrzeugteile Gmbh & Co. Kg, Coburg Drive arrangement for electrically adjustable components of a motor vehicle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2168497A (en) * 1984-12-18 1986-06-18 Toshiba Kk Load state detecting apparatus of an induction motor
GB2168497B (en) * 1984-12-18 1989-03-30 Toshiba Kk Load state detecting apparatus of an induction motor

Also Published As

Publication number Publication date
DE2416999A1 (en) 1977-09-15
DE2416999B2 (en) 1978-04-13
DE2416999C3 (en) 1978-12-21
NL7502859A (en) 1975-10-10

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee