Multi-turn Measurement System Using Magnetic Field Sensors
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Solution Overview
Problem
Existing measurement systems for shaft rotation over multiple turns are expensive and prone to mechanical failure due to unreliable manufacturing, leading to inaccurate measurements, particularly when using potentiometers for angular position and rotation tracking.
Innovation Solution
A multi-turn measurement system comprising a shaft with engaging pinions and gears, each equipped with magnets and magnetic field sensors, where the rotation of pinions drives gear rotation, and magnetic field sensors detect changes in the magnetic fields to determine angular position and number of rotations, utilizing a processor to generate output signals based on sensor inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If potentiometers are used to measure angular position and number of rotations, then measurement capability is achieved, but cost increases and reliability decreases
Solution Approach 1:
The patent replaces the mechanical potentiometer system with a magnetic field-based measurement system. Magnets are attached to the shaft and gear, and magnetic field sensors detect their positions to determine angular position and rotation count. This eliminates mechanical contact and wear, improving reliability while reducing manufacturing costs through the use of simpler, more durable components.
Solution Approach 2:
The patent uses magnetic field sensing to create an electrical copy of the mechanical position information. Instead of directly measuring mechanical displacement with a potentiometer, the system uses magnets as physical copies that generate magnetic field patterns, which are then detected and converted into position and rotation data by magnetic sensors and processing circuitry.
2Measurement precision
If potentiometers are used for measurement, then angular position can be measured, but mechanical failure risk increases
Solution Approach 1:
The patent replaces the mechanical potentiometer system with a magnetic field-based measurement system. Magnets are attached to the shaft and gear, and magnetic field sensors detect their positions to determine angular position and rotation count. This eliminates mechanical contact and wear, improving reliability while reducing manufacturing costs through the use of simpler, more durable components.
3Measurement precision
If high accuracy potentiometers are used, then measurement accuracy is improved, but cost and mechanical failure risk increase
Solution Approach 1:
The patent replaces the mechanical potentiometer system with a magnetic field-based measurement system. Magnets are attached to the shaft and gear, and magnetic field sensors detect their positions to determine angular position and rotation count. This eliminates mechanical contact and wear, improving reliability while reducing manufacturing costs through the use of simpler, more durable components.
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 system provides accurate and reliable measurement of shaft rotations and angular positions over multiple turns, reducing costs and mechanical failures compared to traditional potentiometer-based systems, while maintaining high precision and durability.
Implementation Method 1
The magnets each have a magnetic field that changes based on an angular position of the one of the plurality of gears. The magnetic field sensors are each positioned to sense the magnetic field of one of the plurality of magnets.
Data Source
AI summary
A multi-turn measurement system includes a plurality of gears, a plurality of pinions engaging the plurality of gears, a plurality of magnets each disposed on one of the plurality of gears, and a plurality of magnetic field sensors. Rotation of the pinions about a center axis drives rotation of the plurality of gears. The magnets each have a magnetic field that changes based on an angular position of the one of the plurality of gears. The magnetic field sensors are each positioned to sense the magnetic field of one of the plurality of magnets.