Closed-Circuit Magnetic Field Control for Stable Micro-Robot Steering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electromagnetic driving systems for magnetic micro-robots and catheters generate low-density magnetic fields due to open magnetic circuits, limiting their driving speed and performance, especially at high frequencies, and struggle to maintain stability and direction control in pulsating environments like blood vessels.
Innovation Solution
A magnetic field control system with a three-dimensional structure featuring closed circuits with variable capacitors and coils, allowing for adjustable resonance frequencies and enhanced magnetic field intensity, enabling stable location control and directional switching in pulsating environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an open magnetic circuit is used to generate magnetic fields, then the system structure is simple, but the magnetic field density is low and leaks to the outside
Solution Approach 1:
The magnetic circuit is segmented into multiple components: a housing forming an enclosed space, multiple coils positioned at different locations, and magnetic cores that guide flux. This segmentation allows the magnetic field to be contained and directed within the housing while maintaining structural simplicity.
Solution Approach 2:
Multiple coils are merged into a single enclosed magnetic circuit housing, creating a unified magnetic field generation system. The housing combines the functions of structural support, magnetic flux containment, and coil mounting, thereby increasing magnetic field density without proportionally increasing overall system complexity.
2Stability of the object's composition
If feedback control is used to overcome magnetic field decreasing effect, then the magnetic field stability improves, but the basic problem of low output cannot be solved
Solution Approach 1:
The system employs alternating current in the coils to generate time-varying magnetic fields that induce vibrational motion in the magnetic micro-robot. This vibrational mechanism, combined with the enclosed magnetic circuit, enables both high output and stability by creating a resonant driving effect rather than relying solely on feedback control.
Solution Approach 2:
Periodic alternating current is applied to the coils to generate oscillating magnetic fields that drive the magnetic micro-robot. This periodic action creates a sustained high-output magnetic field effect while the enclosed circuit maintains stability, eliminating the need for feedback control to achieve basic output levels.
3Force
If current is increased to increase magnetic field intensity, then the magnetic field strength improves, but efficiency decreases due to narrow inner space and increased current
Solution Approach 1:
Magnetic cores are positioned at specific locations within the housing to concentrate and guide magnetic flux to where it is most needed. This local concentration of magnetic properties allows high field intensity to be achieved in target areas without requiring proportionally high current throughout the entire system, thereby improving efficiency.
Solution Approach 2:
Multiple smaller coils are distributed throughout the housing, each generating localized magnetic fields that collectively produce the desired overall effect. This distributed approach is more efficient than using a single high-current coil, as it reduces resistive losses and allows better utilization of the narrow inner space.
4Speed
If high frequency alternating magnetic fields are used to drive micro-robots, then the driving speed improves, but the magnetic field magnitude abruptly decreases due to inductance effect
Solution Approach 1:
The system is designed to operate at resonant frequencies where the inductance effect is compensated by the mechanical resonance of the magnetic micro-robot. This allows high-frequency operation for fast driving while maintaining sufficient magnetic field magnitude through resonant amplification rather than direct high-frequency excitation.
Solution Approach 2:
The system optimizes the inductance and capacitance parameters of the coil circuits to achieve resonance at desired high frequencies. By adjusting these parameters, the magnetic field magnitude can be maintained at high frequencies, enabling fast driving speed without the abrupt decrease in field strength that would otherwise occur.
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 system effectively increases magnetic field intensity, maintains stability, and improves steering performance by generating high-density magnetic fields and synchronizing with external vibrational magnetic fields for crawling motion and directional control.
Implementation Method 1
An electromagnetic driving system is a magnetic field generating apparatus for controlling a magnetic micro-robot or a magnetic catheter by using a magnetic field generated by a coil, along which currents flow.
Implementation Method 2
a resonance frequency of the first closed circuit may vary according to a capacitance of the first variable capacitor
Data Source
AI summary
A magnetic field control system according to an embodiment of the present invention may comprise: a structure forming part for forming a three-dimensional structure having an inner space; a magnetic field generating part for generating a magnetic field, the magnetic field generating part being formed to extend from a predetermined position of the structure forming part and being disposed to face a target region defined in the inner space; and a power source part for supplying electric power to the magnetic field generating part.