Magnetostrictive Vibrator for Polymeric Microstructure Formation
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Solution Overview
Problem
Existing methods for producing microelectromechanical systems (MEMS) face challenges in coordinating temperature regimes with mechanical pressure and high-frequency oscillations over time, particularly due to the limitations of piezoceramic elements which depolarize at higher temperatures, and require complex control systems for efficient material bonding.
Innovation Solution
A system utilizing a magnetostrictive vibrator with a U-shaped magnetic conductor and windings, where one winding controls magnetization and the other generates high-frequency oscillations, allowing for precise control of vibration and temperature levels in an electromechanical transducer to efficiently form polymeric microstructures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If piezoceramic elements are used for excitation of oscillations, then high frequency oscillations can be generated, but the operating temperature cannot exceed 180 °C because the piezoceramic elements depolarize at higher temperatures
Solution Approach 1:
The patent changes the fundamental operating parameters of the transducer by replacing piezoceramic elements with magnetostrictive elements (such as nickel, permalloy, or other ferromagnetic materials). Magnetostrictive materials can operate at temperatures exceeding 180 °C without depolarization, thus resolving the temperature limitation while maintaining the ability to generate high-frequency oscillations through magnetic field excitation
Solution Approach 2:
The patent substitutes the piezoelectric effect (mechanical stress-induced polarization) with the magnetostrictive effect (magnetic field-induced dimensional change). This replacement allows the system to generate mechanical oscillations through magnetic field modulation rather than electric field modulation, enabling operation at elevated temperatures where piezoceramics would fail
2Manufacturing precision
If the temperature regime is adapted to mechanical pressure and high frequency oscillations over time, then the forming process can be optimized, but the control process becomes complex depending on the functionality of the control elements
Solution Approach 1:
The patent combines multiple control functions into a single integrated controller that simultaneously manages the magnetostrictive transducer excitation, heating element temperature control, and mechanical pressure application. This unified control approach coordinates all forming parameters (temperature, pressure, vibration) in real-time without requiring complex multi-system integration, thus achieving precise forming process control while minimizing control system complexity
Solution Approach 2:
The controller is designed as a multi-functional device that can independently and simultaneously manage multiple physical parameters (magnetic field excitation, thermal heating, mechanical pressing). This universal control capability allows the system to optimize the forming process by coordinating all parameters through a single control unit, reducing overall system complexity while maintaining manufacturing precision
3Productivity
If high frequency oscillations are used to generate high temperatures through friction, then polymer bonding can be achieved in very short time, but the temperature and vibration levels are difficult to achieve without a control system
Solution Approach 1:
The magnetostrictive transducer inherently converts electrical energy to mechanical vibration and generates heat through internal hysteresis losses and friction during oscillation. This self-heating capability eliminates the need for external heating control systems, allowing the device to automatically achieve the necessary temperature for polymer bonding while maintaining high-frequency oscillations, thus improving productivity without proportionally increasing control system complexity
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 system enables efficient control of the forming process by generating high-frequency oscillations and controlled temperatures, improving the quality and efficiency of structural element formation in polymeric materials.
Implementation Method 1
a magnetostrictive vibrator consisting of a magnetostrictor with a core on which two windings are wound: one for achieving the magnetization level of the magnetostrictor, and the other for excitation of the high frequency oscillations in the magnetostrictor
Implementation Method 2
the sonotrode temperature is changed by a high-frequency electrical signal connected to the corresponding magnetostrictor winding
Data Source
Figure 1
AI summary
The invention belongs to the field of materials science, more specifically, to the technology for the production of microstructures - the development of elements of microelectromechanical systems (MEMS). This system comprises a magnetostrictive vibrator (1) consisting of multilayer ferromagnetic plates, the operating part of which is attached to the concentrator-sonotrode (2, 4). Between the end parts of the magnetostrictive vibrator (1) the gasket (3) is installed that insulates the temperature and the liquid. The entire magnetostrictive vibrator (1) is housed in a sealed housing (9) with the coolant (10) circulating therein. The magnetic conductor plates of magnetostrictive vibrator (1) are wound with windings (6) and (7) comprising terminals which, like the signal from the temperature and vibration sensor (11) on the mechanical vibration concentrator (2, 4), are connected to the excitation and control generator (8). The operating part of the concentrator-sonotrode (2, 4) performs the forming procedure by applying pressure to the polymeric material (5) on the tray (13). The comprehensive and timely effect of high-frequency vibration excitation and increased temperature and pressure on the formed polymeric structure allows to increase the efficiency of the whole process and the quality of the structural elements to be produced.