Magnetization Apparatus for Magnetic Encoder Sine Wave Precision
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Solution Overview
Problem
Conventional magnetization methods for magnetic encoders often result in unsatisfactory sine wave waveforms due to defects in the magnetizing yoke, position aberrations, and temperature changes, leading to inaccurate polarity information and performance issues.
Innovation Solution
A magnetization method and apparatus that applies magnetism in one direction to the entire half wavelength interval of a sine wave on a magnetic body to form a first-order rectangle or trapezoidal wave, followed by opposite direction magnetism at the start and terminal points to achieve a magnetized state with a half wavelength pulse of a sine wave, ensuring precise polarity information and reduced zero crossing point tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If magnetization region width and space are adjusted to form sine wave pattern, then polarity information is obtained, but waveform accuracy deteriorates due to peak collapse and sensitivity to manufacturing defects
Solution Approach 1:
The patent applies preliminary magnetization to create a first-order rectangle wave or trapezoidal wave pattern before final sine wave magnetization. This preliminary structure provides a robust foundation that is less sensitive to subsequent manufacturing variations, allowing the final sine wave waveform to maintain higher accuracy without being severely affected by magnetizing yoke defects or position aberrations.
Solution Approach 2:
The patent changes the magnetization parameters by applying magnetism in opposite directions at different stages. First, a strong magnetization is applied to create the rectangle/trapezoidal wave, then opposite direction magnetism is applied at start and terminal points to refine the waveform into a precise sine wave. This parameter variation approach enables better waveform control and reduces peak collapse.
2Ease of manufacture
If conventional magnetization method with constant voltage or electric charge is used, then manufacturing process is simple, but waveform precision deteriorates due to position aberration and temperature changes
Solution Approach 1:
The patent introduces a preliminary magnetization step that creates a first-order rectangle wave or trapezoidal wave as a foundation. This preliminary structure is more robust to manufacturing variations including position aberration and temperature changes. The subsequent sine wave magnetization builds upon this stable foundation, maintaining zero crossing point accuracy even when using conventional constant voltage or electric charge methods.
3Ease of manufacture
If magnetizing yoke has defects or position aberration occurs, then manufacturing is easier, but waveform quality deteriorates with collapsed peak and shifted zero crossing point
Solution Approach 1:
The patent creates a preliminary first-order rectangle wave or trapezoidal wave magnetization pattern that serves as a robust foundation. This preliminary structure is less sensitive to magnetizing yoke defects and position aberrations. When the final sine wave magnetization is applied, the underlying preliminary pattern helps maintain waveform integrity, reducing the impact of manufacturing imperfections on peak shape and zero crossing point position.
Solution Approach 2:
The patent employs parameter changes by applying opposite direction magnetism at the start and terminal points of the magnetization region. This technique compensates for waveform distortions caused by magnetizing yoke defects or position aberrations, maintaining accurate sine wave shape and proper zero crossing point positioning even under less than ideal manufacturing conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures a satisfactory sine wave waveform with reduced peak collapse and improved zero crossing point accuracy, maintaining position tolerance within one twelfth of the sine wave wavelength, enhancing the performance of magnetic encoders.
Implementation Method 1
a voltage or an electric charge at a constant level is supplied to a coil of a magnetizing yoke
Implementation Method 2
magnetism in opposite direction is applied to a start point and a terminal point of the interval by the same magnetizing yoke or a different magnetizing yoke
Data Source
AI summary
A magnetization method and a magnetization apparatus for forming an objective magnetized state in a one-dimensional region of a magnetic body, and a magnet for a magnetic encoder. In the magnetization method, magnetism in one direction is applied to an entire half wavelength interval of a sine wave on the magnetic body by a magnetizing yoke and a magnetized state of a first-order rectangle wave or of a first-order trapezoidal wave is formed in the interval, the magnetized state presenting polarity information in a rectangle or trapezoidal pulse shape; and thereafter, magnetism in opposite direction is applied to a start point and a terminal point of the interval by the same magnetizing yoke or a different magnetizing yoke one time or several times and the magnetized state of the first-order rectangle wave or of the first-order trapezoidal wave is changed into the objective magnetized state.