CN1281925C - Method for improving resolution ratio of magnetic coder magnetic drum - Google Patents
Method for improving resolution ratio of magnetic coder magnetic drum Download PDFInfo
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- CN1281925C CN1281925C CN 200510011202 CN200510011202A CN1281925C CN 1281925 C CN1281925 C CN 1281925C CN 200510011202 CN200510011202 CN 200510011202 CN 200510011202 A CN200510011202 A CN 200510011202A CN 1281925 C CN1281925 C CN 1281925C
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- magnetic drum
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Abstract
The present invention provides a method for improving the resolution of a magnetic drum of a magnetic coder. After the magnetic drum is prepared by extrusion molding through a coating technology, a magnetic layer is polished by a fine polishing sand paper to make the magnetic layer thinned to 0.1 to 0.05mm. Then, magnetic poles are written in the magnetic drum by a magnetic head with a narrow magnetic leakage gap. The magnetic head with the magnetic leakage gap of 0.1 to 0.05mm charges magnetism for the magnetic drum; 512 pairs of magnetic poles are written in the magnetic drum. The present invention has the advantages of simple technology, easy operation, complete pulse counting, favorable output waveform signals and excellent component performance, and is capable of writing 512 pairs of magnetic poles.
Description
Technical field
The invention belongs to a kind of magnetic coder technical field, a kind of method that improves resolution ratio of magnetic coder magnetic drum particularly is provided.Satisfied high-precision requirement in the industrial circles such as numerically-controlled machine, measurement instrument.
Background technology
Magnetic encoder is a kind of novel coding device that development in recent years is got up, compare with optical encoder, magnetic encoder is not subject to dust and dewfall influence, and is simple and compact for structure, can run up, response speed is fast, volume is little, cost low (Kunio Miyashita, et al. (1987), IEEETrans.Magn.23 (5), 2182-2184).Therefore, at precision optical machinery,, have a wide range of applications in the every field such as business automation equipment such as printer, measuring instrument as numerically-controlled machine, robot.
Magnetic encoder mainly is to be made of magnetic drum and magnetic sensing probe, and its resolution depends on the number of magnetic poles of magnetic drum material to a great extent.At present, someone's rubber of adopting Co-P and Co-Ni-P alloy firm and being mixed with the barium ferrite particle is made magnetic drum material (United States Patent.Ito et al.4274053.June.16,1981 in the world; United StatesPatent.Ito et al.4319188.Mar.9,1982).
Domestic magnetic coder magnetic drum mostly is the magnet ring type, and magnetosphere is thick to be several millimeters, and under the longitudinal magnetic recording pattern, bigger demagnetizing field has limited writing of magnetic signal, generally can only write tens pairs of utmost points, and resolution is lower.What we adopted is the application type magnetic drum.In the past, our magnetosphere of preparation can write 128 and 256 pairs of utmost points to magnetic drum to 0.15mm.But 512 grades are more multipole to be restricted when several writing, and number of poles can not completely write, pulse missing, and the waveform consistance is relatively poor.This need to magnetic drum material preparation technology further improve.
Summary of the invention
The object of the invention is to provide a kind of method that improves magnetic coder with magnetic drum resolution.The magnetic drum number of magnetic poles that makes is many, and the precision height can satisfy high-precision requirement in the industrial circles such as numerically-controlled machine, robot, measurement instrument.
The present invention adopts coating process, after extrusion molding prepares magnetic drum, with meticulous polishing sand paper polishing magnetosphere, makes magnetisable coating be thinned to 0.1～0.05mm.Magnetic head with narrow leakage field gap writes magnetic pole to magnetic drum again, and the narrow leakage field gap of employing is that the magnetic head in 0.1～0.05mm leakage field gap magnetizes to magnetic drum, and writing magnetic pole is 512 pairs of utmost points.
In the present invention, polish with meticulous polishing sand paper the magnetic paint curing back of coating on the magnetic drum matrix, can increase surface smoothness and smooth finish, can make magnetisable coating be thinned to 0.1～0.05mm again.Adopt the magnetic head in 0.05mm leakage field gap that magnetic drum is magnetized, can write 512 pairs of utmost points, step-by-step counting is complete, and output waveform signals is good.
The invention has the advantages that technology is simplified, easy operating can write 512 pairs of utmost points, and step-by-step counting is complete, and output waveform signals is good, the components and parts excellent performance.
Embodiment
Embodiment 1
1, the Al drum cleans
Al drum diameter is selected 40mm for use, with acetone, deionized water, absolute ethyl alcohol ultrasonic cleaning aluminium drum, removes its surperficial greasy dirt and physisorption successively.
2, magnetic paint preparation and coating
Adopt γ-Fe of 690 Oe
2O
3Magnetic 7g, epoxy resin of binder 10g, thinning agent acetone 7.5g, hardening agent T-31 2.5g, spreading agent silane 1g.Through making uniform magnetic paint after high-speed stirred, the sanded, to coat on the aluminium drum base body, rotation is solidified.With the bearing extrusion molding of high-flatness, making coating thickness is about 0.10mm when magnetic paint is in semi-cured state.(above two steps are ginseng " a kind of preparation method of high resolving power magnetic coder magnetic drum " in addition, number of patent application: on August 13rd, 200410009427.42004)
With the magnetic drum driven by motor, at the uniform velocity rotate with about 50 rev/mins speed, with the polishing sand paper of 800# magnetosphere is polished, to magnetic layer thickness be 0.08mm.
3, the test of magnetizing
After the magnetosphere full solidification, the high-resolution optical encoder of 1024PPR and magnetic drum to be magnetized are installed on same axle go up and drive at the uniform velocity rotation by slowspeed machine, the pulse signal of high-resolution optical encoder output can produce series of pulses such as 512PPR, 256PPR, 128PPR, 64PPR behind the frequency dividing circuit frequency division.(join " a kind of preparation method of high resolving power magnetic coder magnetic drum ", number of patent application: on August 13rd, 200410009427.42004) in addition.Write head adopts the magnetic head in 0.05mm gap.Magnetic head is pressed close to magnetic layer surface, regulate working current, rotate more than the week, finish and magnetize to optimum value.Can write 512 pairs of utmost points to magnetic drum.
Adopt the metal film magnetoresistance sensing probe to detect magnetic drum surface leakage magnetic field, output waveform signals is good, and step-by-step counting is complete.
Embodiment 2
1, the Al drum cleans
Identical with embodiment 1.
2, magnetic paint preparation and coating
With embodiment 1.With the magnetic drum driven by motor, at the uniform velocity rotate with about 50 rev/mins speed, with the polishing sand paper of 800# magnetosphere is polished, to magnetic layer thickness be 0.07mm.
3, the test of magnetizing
With embodiment 1, write head adopts the magnetic head in 0.10mm gap.Magnetic head is pressed close to magnetic layer surface, regulate working current, rotate more than the week, finish and magnetize to optimum value.Can write 512 pairs of utmost points to magnetic drum.
Claims (2)
1, a kind of method that improves resolution ratio of magnetic coder magnetic drum, it is characterized in that: adopt coating process, after extrusion molding prepares magnetic drum, with meticulous polishing sand paper polishing magnetosphere, make magnetosphere be thinned to 0.1～0.05mm, adopting narrow leakage field gap again is that the magnetic head in 0.1～0.05mm leakage field gap magnetizes to magnetic drum, writes magnetic pole; Described coating process is: the γ-Fe that adopts 690 Oe
2O
3Magnetic 7g, epoxy resin of binder 10g, thinning agent acetone 7.5g, hardening agent T-31 2.5g, spreading agent silane 1g; Through making uniform magnetic paint after high-speed stirred, the sanded, to coat on the aluminium drum base body, rotation is solidified.
2, in accordance with the method for claim 1, it is characterized in that: writing magnetic pole is 512 pairs of utmost points.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510011202 CN1281925C (en) | 2005-01-19 | 2005-01-19 | Method for improving resolution ratio of magnetic coder magnetic drum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510011202 CN1281925C (en) | 2005-01-19 | 2005-01-19 | Method for improving resolution ratio of magnetic coder magnetic drum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1648610A CN1648610A (en) | 2005-08-03 |
| CN1281925C true CN1281925C (en) | 2006-10-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510011202 Expired - Fee Related CN1281925C (en) | 2005-01-19 | 2005-01-19 | Method for improving resolution ratio of magnetic coder magnetic drum |
Country Status (1)
| Country | Link |
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| CN (1) | CN1281925C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107504984A (en) * | 2017-08-25 | 2017-12-22 | 上海岭先机器人科技股份有限公司 | Magnet ring, the magnet ring of magnetic encoder magnetize and reading device and magnetic encoder |
| CN112304344A (en) * | 2020-09-24 | 2021-02-02 | 东北电力大学 | Micro magnetic grid for magnetic encoder manufactured by magnetron sputtering method and manufacturing method thereof |
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2005
- 2005-01-19 CN CN 200510011202 patent/CN1281925C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1648610A (en) | 2005-08-03 |
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Granted publication date: 20061025 Termination date: 20120119 |