JPS554569A - Rotating speed detector - Google Patents
Rotating speed detectorInfo
- 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
Links
Landscapes
- 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
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)
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 |
-
1978
- 1978-06-26 JP JP7789978A patent/JPS554569A/en active Pending
Cited By (1)
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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