Galvanometer Motor Angle Sensing With TMR for LiDAR Resolution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Galvanometer motors in laser radar systems face challenges in enhancing angular resolution due to high production costs and temperature-induced drift of photovoltaic sensors, which require improved resolution and accurate real-time angle information for precise scanning.
Innovation Solution
A galvanometer motor design incorporating a tunneling magnetoresistance sensor, first and second magnets, and an angle limiting member, which rotates within a limited angle range, allowing the sensor to map angles into finite position codes, thereby improving angular resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photovoltaic sensors are used to obtain real-time accurate angle information, then measurement precision is improved, but manufacturing cost increases and temperature stability deteriorates
Solution Approach 1:
The patent replaces photovoltaic sensors with a tunneling magnetoresistance sensor that detects magnetic field changes generated by magnets on the rotating shaft. This substitution eliminates the need for expensive photovoltaic sensors while achieving higher angular resolution through magnetic field detection, directly resolving the contradiction between measurement precision and manufacturing cost
Solution Approach 2:
The patent changes the detection parameter from light-based photovoltaic sensing to magnetic field-based tunneling magnetoresistance sensing. By utilizing the tunneling magnetoresistance effect and configuring magnets with opposite poles adjacent to each other, the system achieves temperature-stable angular measurement with lower cost, simultaneously improving measurement precision while reducing sensitivity to temperature drift
2Measurement precision
If photovoltaic sensors are used to obtain real-time accurate angle information, then measurement precision is improved, but temperature stability deteriorates
Solution Approach 1:
The patent substitutes photovoltaic sensors with tunneling magnetoresistance sensors that detect magnetic field changes. This substitution fundamentally improves temperature stability because magnetic field detection is inherently less sensitive to temperature variations compared to photovoltaic effects, while maintaining high angular resolution measurement precision
Solution Approach 2:
The patent employs a composite sensing approach combining tunneling magnetoresistance sensor technology with magnet configuration. This composite solution integrates the temperature-stable magnetic field detection mechanism with high-resolution angular measurement capability, achieving both improved measurement precision and enhanced temperature stability simultaneously
3Measurement precision
If the rotor assembly rotates within a limited angle range, then measurement precision is improved through finite position coding, but device complexity increases
Solution Approach 1:
The patent replaces complex photovoltaic sensor systems with a simpler tunneling magnetoresistance sensor configuration. By using magnets mounted on the rotating shaft that generate magnetic field changes during rotation, the system achieves finite position coding capability with fewer and simpler components, reducing device complexity while improving angular resolution measurement precision
Solution Approach 2:
The patent implements a self-service mechanism where the rotating magnets automatically generate the magnetic field changes needed for angular position detection. The tunneling magnetoresistance sensor passively detects these changes without requiring additional actuators or complex control systems, achieving precise angular measurement with minimal added complexity
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 significantly enhances the angular resolution of the galvanometer motor, providing high accuracy and reliability in scanning applications with reduced susceptibility to temperature drift and lower energy consumption.
Implementation Method 1
a tunneling magnetoresistance sensor mounted on the housing; and a first magnet and a second magnet mounted adjacent to each other on the rotating shaft
Implementation Method 2
the rotor magnet rotates around the first shaft line under the magnetic field of the stator body
Data Source
AI summary
The present application relates to the field of beam scanning technology and provides a galvanometer motor and a LiDAR. The galvanometer motor includes a stator assembly, a rotor assembly, a tunneling magnetoresistance sensor, a first magnet, and a second magnet. The stator assembly includes a housing and a stator body, while the rotor assembly includes a rotating shaft, a rotor magnet, and an angle limiting member. The rotating shaft is rotatably mounted in the housing around a first shaft line, with a gap between the rotor magnet and the stator body. The rotor magnet rotates around the first shaft line under the magnetic field of the stator body. The tunneling magnetoresistance sensor can map the limited angles formed by the first angle and the second angle into finite position codes.