Electromagnetic Actuator Self-Adaptive Control via Electrical Parameter Measurement
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Solution Overview
Problem
Existing electromagnetic actuators face challenges in accurately determining mechanical forces and adapting to changing operating conditions without additional sensors, particularly due to varying inductance in the closed position and inability to measure dynamic interactions.
Innovation Solution
The electromagnetic actuator incorporates self-adaptive control means that measure total resistance and voltage to calculate elementary energies, determining mechanical force by correlating position, flux, and current, allowing for adaptive control of the excitation coil current based on mechanical force and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional position and speed sensors are used to determine operating parameters, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple measurement functions (position, speed, mechanical force) into a single sensor system that measures electrical parameters (voltage, current, resistance) of the excitation coil. This merging eliminates the need for separate position and speed sensors, reducing device complexity while maintaining measurement precision through electrical parameter analysis.
Solution Approach 2:
The sensor system is designed to perform multiple measurement functions simultaneously by analyzing electrical parameters of the excitation coil. The same measurement system determines position, speed, and mechanical force, making the sensor universal and eliminating the need for multiple specialized sensors.
2Device complexity
If inductance is assumed constant in closed position, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent transitions from assuming constant inductance to dynamically determining inductance as a variable parameter. The inductance is calculated in real-time based on measured electrical parameters (voltage, current, resistance) and the established correlation model, allowing accurate position determination even when inductance varies in the closed position.
Solution Approach 2:
The system uses feedback from electrical parameter measurements to continuously update the inductance value. The measured voltage, current, and resistance are fed into the correlation model to determine both position and inductance, creating a self-correcting system that maintains measurement precision without requiring complex additional hardware.
3Use of energy by moving object
If electrical energy measurement is used to determine mechanical force, then energy efficiency is improved, but measurement precision of mechanical force deteriorates
Solution Approach 1:
The patent replaces direct mechanical force measurement with an electrical measurement system. Instead of using mechanical sensors to measure force, the system measures electrical parameters (voltage, current, resistance) and uses energy conservation principles to calculate mechanical force, eliminating the need for mechanical force sensors while maintaining measurement accuracy through the established correlation model.
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 solution enables precise determination of mechanical forces and adaptive control of the actuator without additional sensors, optimizing energy usage and minimizing impact forces, while accounting for varying inductance and dynamic interactions.
Implementation Method 1
At least one excitation coil is connected to the control means
Implementation Method 2
electromagnetic actuator having a processing unit intended to act on control means as a function of a mechanical force applied to said actuator
Implementation Method 3
Said processing unit comprises means for determining a flux variation in the excitation coil, from a measurement of the voltage and of the current flowing in said coil
Implementation Method 4
having means for measuring a total resistance of the excitation coil from a reference electric current and/or a voltage reference
Implementation Method 5
determining an elementary thermal energy as a function of the total resistance of the excitation coil and of the instantaneous electric current
Data Source
Figure 1~2
Figure 3
AI summary
The actuator (100) has a processing unit (2) acting on control units (21) based on mechanical stress (F) applied on the actuator. A mobile armature (12) is mounted inside a magnetic fixed yoke (11). The processing unit comprises self-adaptive control units with measurement units that measure total resistance of a trip coil (3) from reference electric current and/or reference voltage. The trip coil is connected to the control units that are connected to the self-adaptive control units by varying current intensity in the coil by the mechanical stress. An independent claim is also included for a method for determining mechanical stress applied on an electromagnetic actuator.