ES8802345A1 - Fail-safe speed detection - Google Patents

Fail-safe speed detection

Info

Publication number
ES8802345A1
ES8802345A1 ES539861A ES539861A ES8802345A1 ES 8802345 A1 ES8802345 A1 ES 8802345A1 ES 539861 A ES539861 A ES 539861A ES 539861 A ES539861 A ES 539861A ES 8802345 A1 ES8802345 A1 ES 8802345A1
Authority
ES
Spain
Prior art keywords
frequency
core
winding
signal
fail
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
ES539861A
Other languages
Spanish (es)
Other versions
ES539861A0 (en
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 Mobility Ltd
Original Assignee
Westinghouse Brake and Signal Co Ltd
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 Westinghouse Brake and Signal Co Ltd filed Critical Westinghouse Brake and Signal Co Ltd
Publication of ES539861A0 publication Critical patent/ES539861A0/en
Publication of ES8802345A1 publication Critical patent/ES8802345A1/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
    • G01P3/44—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
    • G01P3/488—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 delivered by variable reluctance detectors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Control Of Velocity Or Acceleration (AREA)

Abstract

Apparatus for detecting the speed of a moving vehicle, or measuring distance travelled, in a fail-safe manner comprises a magnetic sensor 1 mounted in sensing proximity to a magnetically permeable rotor 2. The sensor has a permanent magnet 7, a core 8 and a pole piece 9 about the core is a sensing winding 12 and a further winding 11 connected to an oscillator 14. Frequency responsive means 15 is connected to the output of the sensing winding to detect the variable frequency signal produced by rotor movement and the signal produced by the further winding and to pass the former signal only when the latter signal is present, thus proving correct operation of the apparatus. Frequency of oscillator 14 may lie above or within that suspected to be produced by rotor motion in the latter case the frequency will be altered to maintain separation between the two signals. In an alternative embodiment, magnet 7 lies between the two windings 11 & 12 on a common core.
ES539861A 1984-01-27 1985-01-25 Fail-safe speed detection Expired ES8802345A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08402137A GB2153534A (en) 1984-01-27 1984-01-27 Fail-safe speed detection

Publications (2)

Publication Number Publication Date
ES539861A0 ES539861A0 (en) 1987-04-01
ES8802345A1 true ES8802345A1 (en) 1987-04-01

Family

ID=10555617

Family Applications (1)

Application Number Title Priority Date Filing Date
ES539861A Expired ES8802345A1 (en) 1984-01-27 1985-01-25 Fail-safe speed detection

Country Status (4)

Country Link
AU (1) AU3809985A (en)
ES (1) ES8802345A1 (en)
GB (1) GB2153534A (en)
ZA (1) ZA85365B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3605995C2 (en) * 1986-02-25 1996-11-14 Teves Gmbh Alfred Device for measuring the angular velocity of a rotating body
US4831362A (en) * 1986-05-16 1989-05-16 Aeroquip Corporation Failure detection system for a metallic debris detection system
JPH0789119B2 (en) * 1986-05-30 1995-09-27 住友電気工業株式会社 Electromagnetic power generation type rotation sensor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3559064A (en) * 1968-04-25 1971-01-26 Westinghouse Air Brake Co Velocity indication device with zero speed detection capability

Also Published As

Publication number Publication date
ES539861A0 (en) 1987-04-01
ZA85365B (en) 1985-09-25
GB2153534A (en) 1985-08-21
AU3809985A (en) 1985-08-01
GB8402137D0 (en) 1984-02-29

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