Ferromagnetic Actuator Driven by Multilevel Inductor for MAV Propulsion
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Solution Overview
Problem
Current micro aerial vehicle (MAV) propulsion technologies face challenges in achieving high work density, low cost, and efficient operation due to complexities in magnetic actuation for microelectromechanical systems, including issues with device complexity, heat generation, power consumption, and weight considerations.
Innovation Solution
The integration of a semiconductor device with a multilevel wiring network and a ferromagnetic actuator magnetically coupled to an inductor, forming an LC circuit that generates a magnetic field to transition the ferromagnetic actuator between states, allowing for controlled motion and propulsion, with semiconductor switches managing current flow to optimize magnetic field generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If magnetic actuation is used for MEMS propulsion, then force generation and control are improved, but fabrication complexity and high-current operation become problematic
Solution Approach 1:
The patent combines the inductor and ferromagnetic actuator into a single integrated device structure, where the inductor is formed directly over the ferromagnetic actuator layer. This integration eliminates the need for separate fabrication processes for the inductor and actuator, reducing overall fabrication complexity while maintaining effective magnetic field generation for propulsion
Solution Approach 2:
The ferromagnetic actuator serves multiple functions: it acts as both the magnetic field response element (being attracted by the inductor's magnetic field) and provides mechanical propulsion force. This multi-functionality reduces the need for additional components, simplifying the overall device structure and fabrication process
2Ease of operation
If magnetic actuation is used for MEMS propulsion, then control and low-voltage operation are improved, but high-current operation and heat generation become problematic
Solution Approach 1:
The patent employs periodic switching of the inductor current to generate alternating magnetic fields that drive the ferromagnetic actuator in a oscillating motion. By using pulsed or alternating current rather than continuous high current, the system achieves effective propulsion control while reducing average power consumption and heat generation
Solution Approach 2:
The system utilizes changes in magnetic field parameters (strength, frequency, duration) to control actuator motion. By modulating the inductor current parameters rather than maintaining constant high current, the device achieves precise control over propulsion while managing thermal effects through variable operating conditions
3Force
If magnetic actuation is used for MEMS propulsion, then force generation is improved, but power consumption becomes problematic
Solution Approach 1:
The ferromagnetic actuator is driven by periodic magnetic field pulses from the inductor, creating oscillatory motion that propels the device. This periodic actuation method generates sufficient propulsive force through repeated cycles of magnetic attraction and release, while the intermittent nature of the current pulses reduces overall power consumption compared to continuous operation
Solution Approach 2:
The system exploits mechanical vibration and oscillation of the ferromagnetic actuator in response to alternating magnetic fields. By resonating the actuator at appropriate frequencies, the device achieves efficient force generation with minimal energy input, as the mechanical oscillation amplifies the propulsive effect of each magnetic pulse
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 efficient, controlled motion and propulsion for MAVs and similar devices, overcoming limitations in device complexity, power consumption, and weight, while maintaining low operational costs and high work density.
Implementation Method 1
the inductor generates a magnetic field that causes the ferromagnetic actuator to transition from a first state to a second state
Implementation Method 2
a ferromagnetic actuator magnetically coupled to the inductor
Implementation Method 3
the inductor generates a magnetic field that causes the ferromagnetic actuator to transition
Data Source
AI summary
A ferromagnetic actuator is disposed between first and second semiconductor devices that include first and second inductors. Each inductor is disposed on top of a multilevel wiring structure. Current flows through the first inductor to generate a first magnetic field that attracts the ferromagnetic actuator towards the first inductor causing the ferromagnetic actuator to transition from a first state to a second state. In the second state, a portion of the ferromagnetic actuator is disposed closer to the first inductor than it is in the first state. Current flows through the second inductor to generate a second magnetic field that attracts the ferromagnetic actuator towards the second inductor causing the ferromagnetic actuator to transition from the first or second state to a third state. In the third state, a portion of the ferromagnetic actuator is disposed closer to the first inductor than it is in the first state.