JPS554569A - Rotating speed detector - Google Patents

Rotating speed detector

Info

Publication number
JPS554569A
JPS554569A JP7789978A JP7789978A JPS554569A JP S554569 A JPS554569 A JP S554569A JP 7789978 A JP7789978 A JP 7789978A JP 7789978 A JP7789978 A JP 7789978A JP S554569 A JPS554569 A JP S554569A
Authority
JP
Japan
Prior art keywords
voltage
signal
envelope
rotating speed
thru
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.)
Pending
Application number
JP7789978A
Other languages
Japanese (ja)
Inventor
Masanori Kojima
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP7789978A priority Critical patent/JPS554569A/en
Publication of JPS554569A publication Critical patent/JPS554569A/en
Pending legal-status Critical Current

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  • Control Of Electric Motors In General (AREA)

Abstract

PURPOSE: To double frequency response and achieve higher accuracy of detection by interposing a full-wave rectifying means between an AC voltage generating means and an envelope detecting means.
CONSTITUTION: The AC voltage signal a outputted from a generator 3 along with running of a DC motor 1 is supplied to a full-wave rectifier circuit 8, by which it is converted to a positive voltage signal b. This voltage is then inputted to an envelope detector 4 and the signal b1 is derived in its output. The signal b1 follows up the changes as the level voltages of envelope respectively at sections t1 thru t3, t3 thru t5, t6 and so forth in response to that the crest values of the signal a have changed at the times t2, t4, t6. Hence, the envelope voltage is obtained by sampling the rotating speed fluctuations of the motor 1 at a rate of once every half period of the AC voltage signal of the voltage generator 3 and therefore the phase delay becomes one half and the accuracy of detection becomes twice higher.
COPYRIGHT: (C)1980,JPO&Japio
JP7789978A 1978-06-26 1978-06-26 Rotating speed detector Pending JPS554569A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7789978A JPS554569A (en) 1978-06-26 1978-06-26 Rotating speed detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7789978A JPS554569A (en) 1978-06-26 1978-06-26 Rotating speed detector

Publications (1)

Publication Number Publication Date
JPS554569A true JPS554569A (en) 1980-01-14

Family

ID=13646915

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7789978A Pending JPS554569A (en) 1978-06-26 1978-06-26 Rotating speed detector

Country Status (1)

Country Link
JP (1) JPS554569A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02503037A (en) * 1988-01-27 1990-09-20 ポルテスキャップ Element that generates the tachometer signal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02503037A (en) * 1988-01-27 1990-09-20 ポルテスキャップ Element that generates the tachometer signal

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