Battery-Less Encoder With Wiegand Power Generation Magnets
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Solution Overview
Problem
Existing encoders face challenges in enhancing power generation efficiency, particularly in battery-less systems that utilize power generation elements with Barkhausen characteristics.
Innovation Solution
The encoder incorporates a power generation element, magnetic sensors, a rotationally symmetric first magnet, and a second magnet that rotates on the shaft, generating a magnetic field to power the sensors without a battery, using a Wiegand wire for stable power generation and improving magnetic field efficiency with strategically arranged magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power generation element using Barkhausen characteristics is used in a battery-less encoder, then the encoder can operate without a battery, but the power generation efficiency is insufficient
Solution Approach 1:
The patent changes the magnetic field parameters by introducing a second magnet that rotates continuously in the circumferential direction, creating a time-varying magnetic field that enhances the power generation effect in the Wiegand wire. This parameter change transforms the static or slowly varying magnetic field into a dynamically changing field, significantly improving power generation efficiency while maintaining battery-less operation
Solution Approach 2:
The patent employs a composite magnetic field system combining a first magnet with rotational symmetry (for position detection) and a second magnet rotating continuously (for power generation). This composite approach integrates two different magnetic field functions into one system, where the first magnet provides positional information and the second magnet enhances power generation, thereby improving overall system efficiency without sacrificing reliability
2Loss of energy
If multiple magnets are added to improve power generation efficiency, then power output stability improves, but device complexity increases
Solution Approach 1:
The patent designs the second magnet to serve dual purposes: it generates power through its continuous rotation while also contributing to the magnetic field configuration that aids position detection. The rotational symmetry of the first magnet and the continuous provision of the second magnet create a unified magnetic field system that performs both power generation and encoding functions, reducing overall system complexity despite adding multiple magnets
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 configuration enhances power generation efficiency, enabling stable power output regardless of rotational speed, reducing motor load, and facilitating easy assembly and manufacturing.
Implementation Method 1
a power generation element, magnetic sensors, a first magnet 12m1 which is rotationally symmetric, rotates on a rotating shaft 11a, and is provided near the magnetic sensors 12h, and a second magnet 12m2 which is rotationally symmetric, rotates on the rotating shaft 11a, is provided near the power generation element 12g, and is continuously provided in a circumferential direction
Implementation Method 2
using a Wiegand wire for stable power generation
Implementation Method 3
a second magnet 12m2 which is rotationally symmetric, rotates on the rotating shaft 11a, is provided near the power generation element 12g, and is continuously provided in a circumferential direction
Data Source
AI summary
An encoder includes a power generation element, magnetic sensors, a first magnet which is rotationally symmetric, rotates on a rotating shaft, and is provided near the magnetic sensors, and a second magnet which is rotationally symmetric, rotates on the rotating shaft, is provided near the power generation element, and is continuously provided in a circumferential direction.