Integrated Coil Position Detection Device for Hysteresis Compensation
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Solution Overview
Problem
Magnetoresistive position detection devices face issues with hysteresis, non-linearities, and a restricted measuring range, especially for strong magnetic fields, leading to measurement inaccuracies and requiring additional space for feedback coils and energy supplies, making them bulky and costly.
Innovation Solution
A position detection device incorporating a sensor module with an energy harvester module that uses a single coil for both energy generation and feedback, eliminating the need for a separate feedback coil and external energy sources, and featuring a magnetoresistive sensor with enhanced sensitivity, allowing for compact and cost-effective design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate feedback coil is added to compensate for hysteresis and non-linearities, then measurement precision is improved, but device complexity and installation space increase
Solution Approach 1:
The patent combines the feedback coil and energy supply coil into a single integrated coil structure. This single coil serves dual purposes: generating the feedback magnetic field to compensate for hysteresis and non-linearities, and providing electromagnetic induction for energy supply. By merging these two previously separate components, the patent reduces device complexity and installation space requirements while maintaining measurement precision compensation capabilities
Solution Approach 2:
The integrated coil is designed to perform multiple functions simultaneously: it acts as both a feedback coil for compensation and an energy supply coil for electromagnetic induction. This multi-functional design eliminates the need for separate components, reducing overall device complexity while achieving both measurement precision improvement and energy autonomy
2Measurement precision
If a separate feedback coil is added to compensate for hysteresis and non-linearities, then measurement precision is improved, but installation space increases
Solution Approach 1:
The patent merges the feedback coil and energy supply coil into a single integrated structure, thereby reducing the total installation space required. Instead of allocating separate spatial resources for two distinct coils, the unified coil design optimizes space utilization while maintaining the compensation function for hysteresis and non-linearities
3Reliability
If an external energy source such as a battery is added to supply the MR sensor, then reliability is improved, but installation space and device complexity increase
Solution Approach 1:
The patent implements an energy harvester module that generates electrical energy autonomously through electromagnetic induction from the integrated coil. This self-service energy supply mechanism eliminates the need for external batteries or power sources, reducing installation space and device complexity while ensuring reliable continuous operation of the MR sensor
Solution Approach 2:
The system uses the output signal from the MR sensor to control the current applied to the integrated coil, creating a feedback loop that regulates the magnetic field strength. This feedback mechanism ensures the sensor remains within its optimal linear working range, improving reliability while the same coil provides energy induction
4Measurement precision
If the coil is designed with high number of turns to generate sufficient magnetic field, then feedback effectiveness is improved, but coil resistance increases and voltage requirements increase
Solution Approach 1:
The patent optimizes the coil design by carefully selecting parameters such as turn count, conductor cross-sectional area, and winding configuration to achieve an optimal balance. The design ensures sufficient magnetic field generation for effective feedback compensation while keeping coil resistance and voltage requirements within acceptable limits for practical implementation
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
The solution enables accurate and compact position detection with reduced form factor, improved sensitivity, and energy autonomy, effectively compensating for the limitations of existing devices by integrating energy harvesting and feedback functionality within a single coil system.
Implementation Method 1
These sensors make use of the magnetoresistive effect, according to which the electrical resistance of a material changes when a magnetic field is applied
Implementation Method 2
When the magnet moves relative to this coil, a voltage is induced in the coil
Implementation Method 3
The coil is also designed to have a current applied to it by the sensor module, which generates a magnetic field which is directed in the opposite direction to the magnetic field caused by the magnet
Data Source
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AI summary
The invention relates to a position detection device (100) comprising a sensor module (101) for outputting a sensor output signal (102) that depends on the position of a magnet (103), an energy harvester module (104) for generating energy for the sensor module (101), and a coil (105). The coil (105) is configured to supply a voltage induced by a movement of the magnet (103) to the energy harvester module (104) and/or to be supplied with a current by the sensor module (101) that generates a magnetic field opposite to the magnetic field generated by the magnet (103).