Stator-Integrated Sensors for Free Piston Motion Control
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Solution Overview
Problem
Existing control methods for Free Piston Movers (FPMs) in Linear Power Systems (LPS) are inadequate, limiting optimal system performance due to insufficient sensing of piston motion parameters and thermodynamic environment, which hinders widespread adoption and efficiency.
Innovation Solution
A sensor is integrated within the stator coil space of a Linear Electrical Machine to measure FPM position and motion, using Hall Effect, temperature, or other sensors to provide inputs to a controller for precise control of current and motion, enhancing synchronization and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is integrated within the stator coil space, then measurement precision of FPM position and motion is improved, but device complexity increases
Solution Approach 1:
The sensor is integrated within the stator coil space, merging the sensing function with the existing stator structure. This consolidation eliminates the need for separate sensor housings and mounting mechanisms, thereby improving measurement precision while avoiding proportional increases in overall device complexity.
Solution Approach 2:
The stator assembly serves multiple functions: it provides structural support, generates electromagnetic fields through coils, and houses the sensor for position and motion measurement. This multi-functionality reduces the need for additional dedicated components, resolving the contradiction between enhanced measurement capability and device complexity.
2Reliability
If sensors are added to sense thermodynamic environment and motion parameters, then reliability of FPM control is improved, but device complexity increases
Solution Approach 1:
Multiple sensing functions (position, motion, thermodynamic parameters) are integrated within the stator assembly, combining what would otherwise be separate sensing systems into a unified structure. This merger improves control reliability through comprehensive parameter monitoring while minimizing the increase in device complexity through shared housing and power supply.
Solution Approach 2:
The integrated sensors provide real-time feedback on FPM position, motion parameters, and thermodynamic conditions to the control system. This feedback mechanism enhances control reliability by enabling continuous monitoring and adjustment, while the centralized stator integration keeps the overall system complexity manageable.
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
Improves control of FPM motion, leading to enhanced energy efficiency and performance in LPS by accurately sensing and responding to piston position, velocity, and thermodynamic conditions.
Implementation Method 1
using Hall Effect, temperature, or other sensors to provide inputs to a controller
Data Source
AI summary
A stator assembly for use in a linear electrical machine includes a sensor and a stator having a stator bore and at least one coil. The sensor is disposed within a coil space having a volume between an inner surface of the at least one coil and a stator bore wall. A method of controlling current in a coil of a linear electrical machine includes the linear electrical machine having a stator assembly as described.