Method for mfg. magnetic drum of high resolution magnetic-encoded device

A high-resolution, magnetic encoder technology, applied in the field of preparation of high-resolution magnetic encoder drums, can solve the problems of low precision and high yield of magnetic ring magnetic drums, and achieve easy mass production and high yield , good signal-to-noise ratio

Inactive Publication Date: 2005-03-23
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method of a high-resolution magnetic encoder magnetic drum, which solves the problem of low precision of the magnetic ring type magnetic drum in the past, and the prepared magnetic drum has high precision and can be assembled into a high-resolution magnetic encoder. device, and the method has a high yield and is easy to mass produce

Method used

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  • Method for mfg. magnetic drum of high resolution magnetic-encoded device
  • Method for mfg. magnetic drum of high resolution magnetic-encoded device
  • Method for mfg. magnetic drum of high resolution magnetic-encoded device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Al drum cleaning

[0020] The diameter of the Al drum is selected as 30 mm, and the aluminum drum is ultrasonically cleaned with acetone, deionized water, and absolute ethanol in sequence to remove oil stains and physical adsorption on the surface.

[0021] 2. Magnetic slurry preparation and coating

[0022] γ-Fe with 690 Oe 2 o 3 Magnetic powder 7g, binder epoxy resin 10g, diluent acetone 7.5g, curing agent T-31 2.5g, dispersant silane 1g. After high-speed stirring and sand grinding, a uniform magnetic slurry is made, coated on the aluminum drum base, and solidified by rotation. When the magnetic slurry is in a semi-solidified state, it is extruded with a high-flatness bearing to make the coating thickness 0.15mm.

[0023] 3. Magnetization test

[0024] After the magnetic layer is completely cured, the 1024PPR high-resolution optical encoder and the magnetic drum to be magnetized are installed on the same shaft and driven by a low-speed motor to rotate at a con...

Embodiment 2

[0026] 1. Al drum cleaning

[0027] Al drum diameter is selected 36mm for use. Cleaning procedure is identical with embodiment 1.

[0028] 2. Magnetic slurry preparation and coating

[0029] γ-Fe with 690 Oe 2 o 3 Magnetic powder 10g, binder epoxy resin 10g, diluent acetone 8g, curing agent T-31 2.5g, dispersant silane 1.5g. The preparation process is the same as in Example 1. The resulting coating has a thickness of 0.20 mm.

[0030] 3. Magnetization test

[0031] Same as embodiment 1, write 256 pairs of poles to the magnetic drum at last.

Embodiment 3

[0033] 1. Al drum cleaning

[0034] Al drum diameter selects 40mm for use. Cleaning procedure is identical with embodiment 1.

[0035] 2. Magnetic slurry preparation and coating

[0036] γ-Fe with 690 Oe 2 o 3 Magnetic powder 12g, binder epoxy resin 10g, diluent acetone 9g, curing agent T-312.5g, dispersant silane 2.5g. The preparation process is the same as in Example 1. The resulting coating has a thickness of 0.30 mm.

[0037] The hysteresis loop of the fabricated magnetic layer is as figure 2 shown.

[0038] 3. Magnetization test

[0039] Same as embodiment 1, write 256 pairs of poles to the magnetic drum at last.

[0040] The oscilloscope waveform output after the drum writes 256 pairs of poles is as follows image 3 shown.

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PUM

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Abstract

The invention discloses a manufacturing method for memory drum of high resolution magnetic coder. It uses coating process, and it is squeezed into shape and produces the memory drum materials. The magnetic powder, bonder, diluter, solidifier, dispersant is blended into magnetic pulp according to certain proportion, and then the pulp is pasted on the base of the memory drum. The pasted base is rotated and solidified, when the magnetic pulp is in half solidification state, it is squeezed into shape with high flat bearing, the thickness is 0.15-4mm. after it is fully solidified, it is filled with magnetism with high resolution optical coder pulse, the memory drum can be written with 128, 256 pairs of electrodes, the merits of the invention are: simple, good operation ability.

Description

technical field [0001] The invention belongs to the technical field of magnetic encoders, and in particular provides a method for preparing a magnetic drum of a high-resolution magnetic encoder. It can be widely used in industrial fields such as numerical control machine tools and measuring instruments. Background technique [0002] Magnetic encoder is a new type of encoder developed in recent years. Compared with optical encoder, magnetic encoder is less susceptible to dust and condensation, simple and compact structure, high-speed operation, fast response, small size and low cost. (Kunio Miyashita, et al. (1987), IEEE Trans. Magn. 23(5), 2182-2184). Therefore, it is widely used in precision machinery, such as CNC machine tools, robots, printers, measuring instruments and other office automation equipment. [0003] A magnetic encoder is mainly composed of a magnetic drum and a magnetic sensor probe, and its resolution depends largely on the performance of the magnetic dru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/12
Inventor 王海成王立锦于广华杨涛朱逢吾
Owner UNIV OF SCI & TECH BEIJING
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