Planar Drive Rotor Positioning via 3D Magnetic Field Sensing
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Solution Overview
Problem
Existing planar drive systems face challenges in precisely controlling the position of rotors relative to stators, leading to inaccuracies in movement and positioning, especially due to variations in magnetic rotor fields across different rotors.
Innovation Solution
A method involving a control unit with a position allocating function, utilizing a two-dimensional array of magnetic field sensors to measure and analyze the magnetic rotor field, allowing for precise position determination through a three-dimensional measurement and interpolation, and employing an artificial neural network for real-time position determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic field sensors are used to determine rotor position, then position determination capability is improved, but measurement precision deteriorates due to variations in magnetic rotor fields across different rotors
Solution Approach 1:
The patent changes the parameter of magnetic field measurement by implementing a three-dimensional measurement approach instead of traditional two-dimensional measurement. This allows capturing the magnetic rotor field variations in all spatial dimensions, compensating for production-related deviations and improving both position determination precision and measurement reliability simultaneously
Solution Approach 2:
The patent implements feedback by continuously measuring the magnetic rotor field with the array of magnetic field sensors and using this information to dynamically adjust and refine position determination. The measured magnetic field data feeds back into the control system to improve subsequent position measurements, thereby enhancing both precision and reliability
2Measurement precision
If a two-dimensional array of magnetic field sensors is used, then position determination capability is improved, but device complexity increases
Solution Approach 1:
The two-dimensional array of magnetic field sensors serves multiple functions: it measures the magnetic rotor field for position determination, characterizes production-related deviations, and enables three-dimensional field reconstruction. This multi-functionality justifies the increased device complexity by delivering comprehensive position determination capabilities
Solution Approach 2:
The patent transitions from traditional one-dimensional or point-based sensing to a two-dimensional array configuration, adding spatial dimensionality to the measurement capability. This dimensional expansion enables more precise position determination through spatial field distribution analysis, outweighing the increased structural complexity
3Manufacturing precision
If three-dimensional measurement and interpolation is implemented, then position accuracy is improved, but computational requirements and processing time increase
Solution Approach 1:
The patent performs preliminary action by pre-characterizing the magnetic rotor field during system initialization or commissioning. The three-dimensional field data is measured and stored in advance, creating a reference model that can be used for rapid position determination during operation without requiring real-time complex calculations, thus reducing processing time while maintaining high accuracy
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 method enables precise and accurate control of planar drive systems by accurately determining the position of rotors relative to stators, accounting for production-related deviations and ensuring reliable initialization and operation.
Implementation Method 1
the stator module comprises a sensor module with a plurality of magnetic field sensors for determining a position of the rotor, wherein the magnetic field sensors are arranged in a two-dimensional array on the stator module
Implementation Method 2
a driving force is exerted on the rotor by current-carrying conductors magnetically interacting with drive magnets of a magnet arrangement
Data Source
AI summary
A method for controlling a planar drive system includes generating a position allocating function, in an allocation generating step; measuring a plurality of measuring values of the magnetic rotor field by magnetic field sensors for a position of the rotor relative to the stator module, in a magnetic rotor field determining step; applying the position determination function to the plurality of measuring values of the magnetic rotor field of the plurality of magnetic field sensors, in a measuring value analysis step; and determining the position of the rotor relative to the stator module on the basis of the measurements of the magnetic rotor field measured by the plurality of magnetic field sensors and based on the allocations of the position allocating function, in a position determining step. The application further relates to such a planar drive system.