JPH02103230U - - Google Patents
Info
- Publication number
- JPH02103230U JPH02103230U JP1207989U JP1207989U JPH02103230U JP H02103230 U JPH02103230 U JP H02103230U JP 1207989 U JP1207989 U JP 1207989U JP 1207989 U JP1207989 U JP 1207989U JP H02103230 U JPH02103230 U JP H02103230U
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- signal
- excitation
- detection means
- pulse width
- 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
Links
- 230000005284 excitation Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000010355 oscillation Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Landscapes
- Measuring Volume Flow (AREA)
Description
第１図は本考案の１実施例の構成を示すブロツ
ク図、第２図は第１図に示す実施例のうち検出器
の構成を示す縦断面図、第３図は第１図に示す実
施例の動作を説明する波形図、第４図は第１図に
示す検出コイルの代りにホール素子を用いたたの
実施例の要部を示すブロツク図、第５図は第４図
に示す実施例の動作を説明する波形図、第６図は
第１図に示す検出器の他の実施例の構成を示す縦
断面図、第７図は第１図に示す検出器の更に他の
実施例の構成を示す縦断面図、第８図は従来の電
磁流量計の構成の概要を示すブロツク図、第９図
は第８図に示す電磁流量計の動作を説明する波形
図である。
１０……パイプ、１３，１４……励磁コイル、
１５，１６……励磁電源、１７……検出抵抗、１
８……励磁制御回路、１９……信号処理回路、２
１，２１Ａ，２１Ｂ……検出コイル、２２……同
期整流回路、２３……発振回路、２４……分周回
路、２５……制御回路、２６……加算増幅回路、
２７……パルス幅変調回路、２８……励磁制御回
路、３６……ホール素子、ＳＷ１，ＳＷ２……ス
イツチ、ＳＨ……周波数信号、ＳＤ……分周信号
、ＳＣ，ＳＨＬ……検出信号、Ｖｆ……磁場信号
、ＶＡ……加算信号、ＶＷ……パルス幅信号、Ｓ
１〜Ｓ４……制御信号。
FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing the configuration of a detector in the embodiment shown in FIG. 1, and FIG. A waveform diagram explaining the operation of the example, FIG. 4 is a block diagram showing the main part of another example using a Hall element in place of the detection coil shown in FIG. 1, and FIG. 5 is an implementation example shown in FIG. A waveform diagram explaining the operation of the example, FIG. 6 is a vertical cross-sectional view showing the configuration of another embodiment of the detector shown in FIG. 1, and FIG. 7 is a further embodiment of the detector shown in FIG. 1. 8 is a block diagram showing an outline of the structure of a conventional electromagnetic flowmeter, and FIG. 9 is a waveform diagram illustrating the operation of the electromagnetic flowmeter shown in FIG. 10...pipe, 13,14...excitation coil,
15, 16...Excitation power supply, 17...Detection resistor, 1
8... Excitation control circuit, 19... Signal processing circuit, 2
1, 21A, 21B...Detection coil, 22...Synchronous rectification circuit, 23...Oscillation circuit, 24...Divide circuit, 25...Control circuit, 26...Summing amplifier circuit,
27... Pulse width modulation circuit, 28... Excitation control circuit, 36... Hall element, SW 1 , SW 2 ... Switch, SH... Frequency signal, SD... Frequency division signal, SC, SHL... Detection signal , V f ...magnetic field signal, VA...addition signal, VW...pulse width signal, S
1 to S4 ...Control signal.
Claims (1)
加され測定流量に対応して発生する信号電圧を検
出する信号検出手段と、前記励磁コイルに流れる
励磁電流の極性を切り換える切換スイツチを介し
て前記励磁電流を供給する励磁手段と、前記磁場
の変化を検出する磁場検出手段と、この磁場検出
手段の出力を用いて高周波信号をパルス幅変調し
てパルス幅信号を出力する変調手段と、このパル
ス幅信号を前記高周波信号よりは低い周波数の励
磁周波数で切り換えた制御信号を出力する制御手
段とを具備し、この制御信号により前記切換スイ
ツチの開閉を制御することを特徴とする電磁流量
計。 An excitation coil that generates a magnetic field, a signal detection means that detects a signal voltage generated in response to the measured flow rate when this magnetic field is applied, and a changeover switch that switches the polarity of the excitation current flowing through the excitation coil. an excitation means for supplying a magnetic field; a magnetic field detection means for detecting a change in the magnetic field; a modulation means for pulse width modulating a high frequency signal using the output of the magnetic field detection means to output a pulse width signal; and a control means for outputting a control signal which is switched at an excitation frequency lower than the high frequency signal, and the opening and closing of the changeover switch is controlled by the control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1207989U JPH0712901Y2 (en) | 1989-02-03 | 1989-02-03 | Electromagnetic flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1207989U JPH0712901Y2 (en) | 1989-02-03 | 1989-02-03 | Electromagnetic flow meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02103230U true JPH02103230U (en) | 1990-08-16 |
| JPH0712901Y2 JPH0712901Y2 (en) | 1995-03-29 |
Family
ID=31221202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1207989U Expired - Lifetime JPH0712901Y2 (en) | 1989-02-03 | 1989-02-03 | Electromagnetic flow meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0712901Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2012132363A1 (en) * | 2011-03-25 | 2014-07-24 | 株式会社東芝 | Electromagnetic flow meter, electromagnetic flow measurement system and method |
-
1989
- 1989-02-03 JP JP1207989U patent/JPH0712901Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0712901Y2 (en) | 1995-03-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6031740A (en) | Method of regulating the coil current of electromagnetic flow sensors | |
| US4206640A (en) | Magnetic flowmeter | |
| JPH02103230U (en) | ||
| JP2000035352A (en) | Adjusting method for coil current flowing in coil assembly | |
| JPH05219776A (en) | Inductor current sensing circuit | |
| EP1152226B1 (en) | Improved inductive type magnetic flow meter | |
| JPH03117729U (en) | ||
| JPH0733598Y2 (en) | Stepping motor device | |
| JPH02101232U (en) | ||
| JPH0719010Y2 (en) | Pulse current detector | |
| JP2744474B2 (en) | DC motor speed control circuit | |
| JPH0110573Y2 (en) | ||
| JPH0638779Y2 (en) | Power steering control device | |
| JPH0450502Y2 (en) | ||
| JP2003279393A (en) | Electromagnetic flowmeter | |
| JPS5914853Y2 (en) | Computing device for electromagnetic flowmeter | |
| JPS5836291B2 (en) | Excitation circuit of electromagnetic flowmeter | |
| JPS5956524U (en) | Excitation circuit of electromagnetic flowmeter | |
| JPH03124774U (en) | ||
| JPS61141988U (en) | ||
| JPH029828U (en) | ||
| JPH03120700U (en) | ||
| JPS6351228U (en) | ||
| JPH0318131B2 (en) | ||
| JPH0217622U (en) |