Asymmetric Electromagnetic Actuator for Longer Stroke Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing solenoid linear actuators have limited stroke length due to linear magnetic forces, which restricts their application in scenarios requiring nonlinear forces or longer strokes.
Innovation Solution
The use of asymmetric coil geometry and magnet configurations, such as conical or pyramidal-shaped magnets, and differential power supply to coils, creates non-uniform magnetic field distributions, enabling longer strokes and nonlinear force profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a conventional solenoid linear actuator with uniform coil windings is used, then the structure is simple and easy to manufacture, but the stroke length is limited due to linear magnetic forces
Solution Approach 1:
The patent applies asymmetry by configuring coil windings with different winding densities in different regions along the solenoid axis. Specifically, the first region has a first winding density while the second region has a second winding density that differs from the first. This asymmetric winding distribution creates a non-uniform magnetic field that enables extended stroke length beyond the limitations of conventional uniform solenoids, while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent implements local quality by varying the winding density in specific regions of the coil rather than uniformly across the entire coil. The first region and second region are distinguished by their different winding densities, allowing localized optimization of magnetic field characteristics to achieve longer stroke while keeping other parts of the structure simple.
2Adaptability or versatility
If asymmetric coil geometry and differential power supply are used to create non-uniform magnetic field distributions, then nonlinear force profiles and longer strokes are achieved, but the device complexity increases
Solution Approach 1:
The patent utilizes asymmetry in two ways: first, in the physical geometry of the coil windings with different winding densities in different regions; second, in the electrical power supply by providing different power levels to different regions. This dual asymmetry enables the generation of nonlinear force profiles and extended stroke lengths, providing greater adaptability for various application requirements.
Solution Approach 2:
The patent applies dynamics by enabling variable power supply to different regions of the coil. The power supply system can dynamically adjust the amount of power delivered to the first region versus the second region, allowing the magnetic field distribution and resulting force profile to be dynamically controlled. This provides versatility in generating different force profiles as needed.
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 approach allows for extended stroke lengths and nonlinear force generation, enhancing the performance of linear actuators in applications requiring longer motion ranges and varied force profiles.
Implementation Method 1
a current-carrying conductor, which by Oersted's Law generates a magnetic field (given by Biot-Savart), interacts with an external magnetic field, and thus—a force on both the conductor and a source of the external magnetic field is generated
Implementation Method 2
a current-carrying conductor, which by Oersted's Law generates a magnetic field (given by Biot-Savart)
Data Source
AI summary
Apparatus, systems, and methods of construction and use to produce linear, rotational or counter-rotational motion, acceleration, and actuation by the use of moveable ferromagnetic, electromagnetic, conductive, or permanent magnetic objects. The moveable objects are oriented to produce or to be acted upon by asymmetric electromagnetic field distributions, thereby resulting in motion of the magnetic objects. Further, exemplary embodiments and applications are described herein.