Magnetic Absolute Encoder Flexible PCB Loop Design
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Solution Overview
Problem
The assembly and positioning of magnetic detection elements in existing magnetic absolute encoders are time-consuming and prone to errors due to the need for precise wire connections and multiple lead wires in a small space, especially when increasing detection precision.
Innovation Solution
A magnetic absolute encoder design that uses a single flexible printed-wiring board to mount all magnetic detection elements, eliminating the need for individual printed-wiring boards and allowing the board to be secured in a loop shape around the bipolar and multipolar magnets, simplifying the positioning and wiring process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple individual printed-wiring boards are used for each magnetic detection element, then each element can be independently positioned and connected, but the assembly time and wire-connecting work become extremely time consuming
Solution Approach 1:
The patent combines multiple individual printed-wiring boards into a single integrated printed-wiring board that accommodates all magnetic detection elements (first and second magnetic detection elements for both bipolar and multipolar encoders). This merging eliminates the need for separate positioning and wire-connecting operations for each individual board, significantly reducing assembly time while maintaining precise positioning through the unified board structure.
2Adaptability or versatility
If multiple lead wires are drawn out for each magnetic detection element, then connection flexibility is maintained, but wiring errors and disconnects occur readily in the small space available
Solution Approach 1:
The patent merges multiple lead wires into a single integrated printed-wiring board with pre-established electrical connections. This eliminates the manual wire-drawing process that causes wiring errors and disconnects in confined spaces, while maintaining wiring flexibility through the board's flexible nature and pre-configured connection paths.
3Measurement precision
If a plurality of pairs of magnetic detection elements are arranged to increase detection precision, then detection precision improves, but the positioning work and wire-connecting work become extremely time consuming
Solution Approach 1:
The patent combines multiple pairs of magnetic detection elements onto a single integrated printed-wiring board, allowing high detection precision to be achieved without proportionally increasing assembly complexity. The unified board structure enables simultaneous positioning of all elements and eliminates repetitive wire-connecting operations, maintaining high productivity even as detection precision requirements increase.
4Ease of manufacture
If multiple individual printed-wiring boards are used, then each board can be independently mounted, but the work of assembling and positioning becomes extremely time consuming
Solution Approach 1:
The patent merges multiple independently mountable boards into a single integrated printed-wiring board that can be mounted as one unit. This eliminates the need for separate positioning and mounting operations for each individual board, significantly reducing the time required for assembly while maintaining the ease of manufacture through the board's modular design and standardized mounting interface.
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 design significantly reduces the time and complexity of assembling and positioning magnetic detection elements, minimizing wiring errors and allowing for precise detection signal adjustment without damaging the flexible printed-wiring board.
Implementation Method 1
a bipolar-side first magnetic detection element and a bipolar-side second magnetic detection element for obtaining detection signals that differ 90 degrees in phase in accompaniment with the rotation of the bipolar magnet
Data Source
AI summary
A magnetic absolute encoder includes: a board-holding assembly mounted to a motor case assembly side; and a flexible printed wiring board which is held, by the board-holding assembly, in the shape of a loop surrounding multipolar and bipolar ring magnets. On the flexible printed wiring board, multipolar-side hall elements and bipolar-side hall elements are mounted and a wiring pattern relating to the hall elements are printed. The assembling work and wiring work of the magnetic absolute encoder provided with a multipolar magnetic encoder and a bipolar magnetic encoder can be performed simply in a short time.