JPH022607U - - Google Patents
Info
- Publication number
- JPH022607U JPH022607U JP8028288U JP8028288U JPH022607U JP H022607 U JPH022607 U JP H022607U JP 8028288 U JP8028288 U JP 8028288U JP 8028288 U JP8028288 U JP 8028288U JP H022607 U JPH022607 U JP H022607U
- Authority
- JP
- Japan
- Prior art keywords
- bridge
- circuit
- signals
- magnetic sensor
- piston rod
- 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
- 230000005291 magnetic effect Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Actuator (AREA)
Description
第１図は、本考案によるストローク検出機能を
有する流体圧シリンダにおける強磁性鉄心と磁気
センサの位置関係を示す断面図である。第２図は
、前記磁気センサの磁気抵抗素子の接続例を示す
回路図である。第３図は、前記回路のＡ相出力の
特性を説明するためのグラフである。第４図は、
本考案によるストローク検出機能を有する流体圧
シリンダの信号処理回路の実施例を示す回路図で
ある。第５図は、前記信号処理回路の動作を説明
するためのグラフである。第６図は、ストローク
検出機能を有する流体圧シリンダの実施例の断面
図である。第７図は、前記ピストンロツドを拡大
し一部破断して示した図である。
１…磁気センサ、ＳＭ…センサの磁石、Ａ１，
Ａ２，Ｂ１，Ｂ２，Ｃ１，Ｃ２，Ｄ１，Ｄ２…磁
気センサの磁気抵抗素子、１０…ピストンロツド
、１０ａ…ピストンロツドの表面硬化層、１１…
強磁性体鉄心、１２…環状非磁性体、１３ａ，１
３ｂ…ポート、１５…センサハウジング、１６…
パツキング、１７…信号処理回路、１８…信号ケ
ーブル、１９…センサ収容室、２１…シリンダ、
２２…ピストン、５０…バツフア増幅回路、５１
，５２，５３，５４…バツフア増幅器、６０…位
相変換回路、６１…加算器、６２，６３…反転増
幅器、７１，７２，７３，７４，７５，７６，７
７…比較器、７９…比較回路。
FIG. 1 is a sectional view showing the positional relationship between a ferromagnetic core and a magnetic sensor in a fluid pressure cylinder having a stroke detection function according to the present invention. FIG. 2 is a circuit diagram showing a connection example of the magnetoresistive element of the magnetic sensor. FIG. 3 is a graph for explaining the characteristics of the A-phase output of the circuit. Figure 4 shows
FIG. 2 is a circuit diagram showing an embodiment of a signal processing circuit for a fluid pressure cylinder having a stroke detection function according to the present invention. FIG. 5 is a graph for explaining the operation of the signal processing circuit. FIG. 6 is a cross-sectional view of an embodiment of a hydraulic cylinder with a stroke detection function. FIG. 7 is an enlarged and partially cutaway view of the piston rod. 1... Magnetic sensor, SM... Sensor magnet, A 1 ,
A2 , B1 , B2 , C1, C2 , D1 , D2 ... Magnetoresistive element of magnetic sensor, 10... Piston rod, 10a... Hardened surface layer of piston rod, 11...
Ferromagnetic core, 12... Annular nonmagnetic material, 13a, 1
3b...Port, 15...Sensor housing, 16...
packing, 17... signal processing circuit, 18... signal cable, 19... sensor housing chamber, 21... cylinder,
22...Piston, 50...Buffer amplifier circuit, 51
, 52, 53, 54... Buffer amplifier, 60... Phase conversion circuit, 61... Adder, 62, 63... Inverting amplifier, 71, 72, 73, 74, 75, 76, 7
7... Comparator, 79... Comparison circuit.
Claims (1)
気特性を有する素材のスケールを設け、磁気セン
サにより前記スケールの移動を検出してピストン
ロツドの移動量を検出するストローク検出装置を
有する流体圧シリンダにおいて、前記スケールに
対して１／４ピツチ配列された磁気抵抗素子から
なる磁気センサと、前記磁気抵抗素子をブリツジ
接続して前記ピストンロツドの移動に対応してπ
／２位相の異なる検出信号Ａ，Ｂを出力するブリ
ツジ回路と、前記検出信号Ａ，Ｂからその反転信
号／Ａ，／Ｂ，および信号Ｂとπ／４位相の異な
る信号Ｃを得る位相変換回路と、前記信号Ａ，Ｃ
，Ｂ，／Ａ，／Ｂの大小を比較して出力する比較
回路から構成したことを特徴とするストローク検
出機能を有する流体圧シリンダ。 In a fluid pressure cylinder, a piston rod is provided with a scale made of a material having magnetic properties different from that of the material of the rod, and a stroke detection device is provided for detecting the movement of the scale using a magnetic sensor to detect the amount of movement of the piston rod. A magnetic sensor consisting of magnetoresistive elements arranged at a 1/4 pitch is bridge-connected to the magnetoresistive element, and the magnetoresistive element is bridge-connected to
A bridge circuit that outputs detection signals A and B with a /2 phase difference, and a phase conversion circuit that obtains inverted signals /A and /B from the detection signals A and B, and a signal C with a π/4 phase difference from the signal B. and the signals A and C
, B, /A, /B and a comparison circuit that compares and outputs a comparison circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8028288U JPH022607U (en) | 1988-06-17 | 1988-06-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8028288U JPH022607U (en) | 1988-06-17 | 1988-06-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH022607U true JPH022607U (en) | 1990-01-09 |
Family
ID=31305114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8028288U Pending JPH022607U (en) | 1988-06-17 | 1988-06-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH022607U (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5757214A (en) * | 1980-07-28 | 1982-04-06 | Itek Corp | Optical encoder |
| JPS58222772A (en) * | 1982-06-18 | 1983-12-24 | Nec Corp | Position detector for linear pulse motor |
| JPS5923609B2 (en) * | 1982-04-09 | 1984-06-04 | 浜松テレビ株式会社 | Secondary electron multiplier |
| JPS61120920A (en) * | 1984-11-19 | 1986-06-09 | Asahi Optical Co Ltd | Encoder type angle and length measuring circuit |
-
1988
- 1988-06-17 JP JP8028288U patent/JPH022607U/ja active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5757214A (en) * | 1980-07-28 | 1982-04-06 | Itek Corp | Optical encoder |
| JPS5923609B2 (en) * | 1982-04-09 | 1984-06-04 | 浜松テレビ株式会社 | Secondary electron multiplier |
| JPS58222772A (en) * | 1982-06-18 | 1983-12-24 | Nec Corp | Position detector for linear pulse motor |
| JPS61120920A (en) * | 1984-11-19 | 1986-06-09 | Asahi Optical Co Ltd | Encoder type angle and length measuring circuit |
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