hybrid numerical method for optimal design of ...

XXII Symposium EPNC Electromagnetic Phenomena in Nonlinear Circuits Pula, CROATIA, 26-29.06.2012

HYBRID NUMERICAL METHOD FOR OPTIMAL DESIGN OF SILICON MICROMOTOR Sławomir Wiak, Krzysztof Smółka

The Faculty of Electrical, Electronic, Computer and Control Engineering

Lodz University of Technology

Presentation plan

Introduction

Analysis

Optimalization


Conclusion

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What will present?

• In this work, the authors introduced Finite Element Methods combined with LUA and Matlab. • This strategy enables changing of all parameters of the micromotors MEMS. • On the other hand, this strategy allowed for taking advantage of FEM, what is possibility of calculations of complicated geometries (different electromagnetic devices too) without additional operations. XXII Symposium EPNC Electromagnetic Phenomena in Nonlinear Circuits Pula, CROATIA, 26-29.06.2012

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Introduction • Micro-Electromechanical-Systems (MEMS) technology has generated a significant interest of academic, research and business sectors.


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Introduction • One of the significant groups of MEMS devices are micromotors. • The principle of movement of these motors is based on electrostatic forces between the stator active electrodes and pole rotor (rotor electrodes) .


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Introduction • Modelling, simulation and analysis tools are needed to support the designer. • A good solution is a combination of Finite Element Analyses with MATLAB, which integrates computation, visualization, and programming in an easy-to-use environment.


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Software

• high-performance behaviour for technical computing

• software for solving low frequency electromagnetic problems

Matlab

FEMM

• extension language has been used to add scripting/batch processing facilities to FEMM.

• toolbox that allows for the operation of FEMM via a set of Octave/MATLAB functions

Lua

OctaveFEMM


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Introduction

• Our hybrid strategy is fully satisfactory in order to simulate the electromechanical characteristics of different structure devices, and dynamic behaviour of the object.


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Introduction This methodology consists of the following general steps:

parameterization of models to speed up geometry introducing creation of the complex models of devices (Matlab-Lua-FEMM) application of those models to rapid prototyping. XXII Symposium EPNC Electromagnetic Phenomena in Nonlinear Circuits Pula, CROATIA, 26-29.06.2012

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Introduction

Application of those methods allowed the authors to

analyse dynamic parameters of micromotors

optimize of characteristics of those devices by classic and genetic methods

describe different methods of control


analysis of new structures of the micromotor.

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Analysis

Analysis of the impact of the gap width between the rotor and stator on torque characteristics XXII Symposium EPNC Electromagnetic Phenomena in Nonlinear Circuits Pula, CROATIA, 26-29.06.2012

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Analysis

Impact of the angle of the rotor pole in the case of the constant angle of the stator (24°) on torque characteristics XXII Symposium EPNC Electromagnetic Phenomena in Nonlinear Circuits Pula, CROATIA, 26-29.06.2012

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Analysis

Impact of the angle of the rotor pole in the case of the same angle of the stator electrodes on the characteristics of torque XXII Symposium EPNC Electromagnetic Phenomena in Nonlinear Circuits Pula, CROATIA, 26-29.06.2012

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Optimalization

Standard

 The electrostatic field in the classical model without rounded poles

Idea

 The electrostatic field in the new model with rounded poles

Very fast analysis

 Analysis of a new structure of the micromotor with rounded poles


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Optimalization

Very fast analysis of a new structure of the micromotor with rounded poles (radius) XXII Symposium EPNC Electromagnetic Phenomena in Nonlinear Circuits Pula, CROATIA, 26-29.06.2012

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Optimalization

The graph shows the difference between the new solution and the classical approach (without rounded poles) XXII Symposium EPNC Electromagnetic Phenomena in Nonlinear Circuits Pula, CROATIA, 26-29.06.2012

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Conclusion

The hybrid methods (MatlabLuaFEMM) proposed by the authors has given the knowledge about the structures of the micromotors and may be used to analyse different devices non-MEMS such as electromagnetic motors.


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Conclusion

Its most important feature is the rapid analysis of new solutions.


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The Faculty of Electrical, Electronic, Computer and Control Engineering

Lodz University of Technology