JPS552915A - Device to detect number of revolution - Google Patents

Device to detect number of revolution

Info

Publication number
JPS552915A
JPS552915A JP7534678A JP7534678A JPS552915A JP S552915 A JPS552915 A JP S552915A JP 7534678 A JP7534678 A JP 7534678A JP 7534678 A JP7534678 A JP 7534678A JP S552915 A JPS552915 A JP S552915A
Authority
JP
Japan
Prior art keywords
voltage
condenser
exceeds
rectangular wave
input
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
JP7534678A
Other languages
Japanese (ja)
Other versions
JPS6021346B2 (en
Inventor
Yoshito Kyogoku
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP7534678A priority Critical patent/JPS6021346B2/en
Publication of JPS552915A publication Critical patent/JPS552915A/en
Publication of JPS6021346B2 publication Critical patent/JPS6021346B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

PURPOSE: To eliminate the influence of the dispersion of elements, by forming a sawtooth wave from pulses whose period is proportional to the number of revolutions of a rotating body and by charging a condenser with a rectangular wave formed when the sawtooth wave exceeds a certain level.
CONSTITUTION: Pulses whose period is proportional to the number of revolutions of a rotating body are input to input terminal IN. Voltage V1 of condenser 15 assumes a sawtooth wave whose period coincides with the period of the input pulses. When voltage V1 exceeds voltage V2, a differential amplifier outputs a rectangular wave. Condenser 17 is charged with this rectangular wave. Zener diode 23 becomes conducting or non-conducting depending upon whether or not voltage V3 exceeds the Zener voltage and outputs as detection signal an (ON or OFF signal to output terminal OUT.
COPYRIGHT: (C)1980,JPO&Japio
JP7534678A 1978-06-23 1978-06-23 Rotation speed detection device Expired JPS6021346B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7534678A JPS6021346B2 (en) 1978-06-23 1978-06-23 Rotation speed detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7534678A JPS6021346B2 (en) 1978-06-23 1978-06-23 Rotation speed detection device

Publications (2)

Publication Number Publication Date
JPS552915A true JPS552915A (en) 1980-01-10
JPS6021346B2 JPS6021346B2 (en) 1985-05-27

Family

ID=13573587

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7534678A Expired JPS6021346B2 (en) 1978-06-23 1978-06-23 Rotation speed detection device

Country Status (1)

Country Link
JP (1) JPS6021346B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6472073A (en) * 1987-09-14 1989-03-16 Sawafuji Electric Co Ltd Revolution controller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6472073A (en) * 1987-09-14 1989-03-16 Sawafuji Electric Co Ltd Revolution controller

Also Published As

Publication number Publication date
JPS6021346B2 (en) 1985-05-27

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