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Process of preparing magnetic drum for high precision magnetic coder

A magnetic encoder, high-precision technology, applied in the preparation of magnetic drums for high-precision magnetic encoders, and the field of magnetic rotary encoders, can solve the problems of low precision of magnetic drums, achieve no surface defects, easy industrialized mass production, sinusoidal waveforms uniform effect

Inactive Publication Date: 2007-10-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a magnetic drum for a high-precision magnetic encoder, which solves the problem of low precision of the magnetic ring type and coating type magnetic drums in the past, and the obtained magnetic drum has excellent magnetic properties and can write 1024 ~2500 pairs of N and S magnetic poles, that is, 1024~2500PPR (pulses per revolution), can be assembled into a high-precision magnetic rotary encoder, and the preparation process is stable, the implementation is strong, and it is easy to industrialize mass production

Method used

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  • Process of preparing magnetic drum for high precision magnetic coder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Aluminum drum cleaning

[0018] The diameter of the aluminum drum is 40 mm, and it is ultrasonically cleaned with acetone, deionized water, and absolute ethanol for 10 to 15 minutes in order to remove oil stains and physical adsorption on the surface.

[0019] 2. Grinding and polishing the surface of the aluminum drum until the surface roughness Ra≤100nm.

[0020] 3. Electroless Co-P magnetic recording film: the main salt cobalt sulfate (CoSO 4 ·7H2O) 20g / L, reducing agent sodium hypophosphite (NaH2PO2·H2O), 18g / L, complexing agent sodium citrate 100g / L, ammonium sulfate 90g / L, respectively dissolved in deionized water, mixed to the specified The volume of the plating solution is adjusted to a pH value of 7.0 with ammonia water, and the aluminum drum is plated at a temperature of 70°C.

[0021] 4. Magnetization test: install the 4096PPR high-resolution optical encoder and the magnetic drum to be magnetized on the same shaft, and drive it to rotate at a constant spe...

Embodiment 2

[0023] 1. Aluminum drum cleaning

[0024] The cleaning steps are the same as in Example 1.

[0025] 2. Grinding and polishing the surface of the aluminum drum

[0026] With embodiment 1.

[0027] 3. Electroless plating of Co-Ni-P magnetic recording film: the main salt cobalt sulfate (CoSO 4 7H2O) 25g / L, nickel sulfate (NiSO4 7H2O) 20g / L, reducing agent sodium hypophosphite (NaH2PO2 H2O), 20g / L, complexing agent sodium citrate 110g / L, ammonium sulfate 100g / L, Dissolve in deionized water respectively, mix to the specified volume of the plating solution, adjust the pH value to 8.5 with ammonia water, and apply plating to the aluminum drum at a temperature of 80°C.

[0028] 4. Magnetization test

[0029] With embodiment 1.

Embodiment 3

[0031] 1. Aluminum drum cleaning

[0032] The cleaning steps are the same as in Example 1.

[0033] 2. Grinding and polishing the surface of the aluminum drum

[0034] With embodiment 1.

[0035] 3. Electroless plating Co-P magnetic recording film: the main salt cobalt sulfate (CoSO 4 7H2O) 30L, reducing agent sodium hypophosphite (NaH2PO2·H2O), 25g / L, complexing agent sodium citrate 12g / L, ammonium sulfate 105g / L, respectively dissolved in deionized water, mixed to the specified plating solution volume, adjust the pH value to 10.0 with ammonia water, and apply plating to the aluminum drum at a temperature of 80°C.

[0036] 4. Magnetization test

[0037] Same as embodiment 1, write 2048 pairs of magnetic poles to the magnetic drum at last.

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Abstract

The process of preparing magnetic drum for high precision magnetic coder belongs to the field of magnetic coder technology. Co-P or Co-Ni-P film as record medium of magnetic drum is prepared through a chemical plating process on an aluminum alloy base with the solution compounded with cobalt salt, reductant, complexing agent and buffering agent in certain weight proportion. The film is crystalline and magnetic, and has P content of 5-10 wt% and thickness of 1-10 microns. Thus prepared magnetic drum may have 1024-2500 pairs of N and S magnetic pole written. The present invention has the advantages of excellent performance, stable preparation process and easy use in industrial production, and the magnetic drum has high resolution and may be combined with anisotropic magnetoresistor film probe to form high precision rotary magnetic coder.

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 for a high-precision magnetic encoder, which can be combined with a magnetic sensor probe to obtain a high-precision magnetic rotary 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. Low (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] The magnetic encoder is mainly composed of three par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/249
Inventor 于广华王海成王立锦杜中美滕蛟朱逢吾
Owner UNIV OF SCI & TECH BEIJING
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