Development And Analysis Of Linear Resonant Scanner With Torsional Mechanism

Large size mirror scanners are needed in several scanning technologies such as, ultra short-throw projector, free-space optical communications and barcode scanner. Several researches on large size mirror in microelectromechanical systems (MEMS) scanner were conducted. For instance, research on micromachined polysilicon microscanners has been performed for barcode scanner. However, the curvature of the microscanners causes image distortion. Furthermore, high operation voltages of the MEMS scanner deter the usage of MEMS scanner in hand-held applications. In this research, a linear resonant scanner consisting of an electronically driven mechanically-resonant torsional spring-mirror system was developed for display applications. The scanner was designed according to the functional components such as compliant structure and actuator. The torsional spring which is the compliant structure was modeled with finite element analysis (FEA) and geometry studies were conducted. The optimized torsional spring with the lowest stress level was selected for the design. The actuator of air core coil (ACC) was used in the scanner; geometry study was used to maximize the magnetic forces of the ACC. The ACC of with minimum length, minimum inner radius and maximum outer radius was used. Besides, experimental analysis and FEA of the scanner showed that resonant frequency, angular displacement and stress level are affected by the magnet position on the suspended plate. After the scanner design, several characteristic studies were conducted. A nonlinear damping model is proven to be able to analyze and predict the free vibration response of the scanner based on experimental results

Development And Analysis Of Linear Resonant Scanner With Torsional Mechanism

Large size mirror scanners are needed in several scanning technologies such as, ultra short-throw projector, free-space optical communications and barcode scanner. Several researches on large size mirror in microelectromechanical systems (MEMS) scanner were conducted. For instance, research on micromachined polysilicon microscanners has been performed for barcode scanner. However, the curvature of the microscanners causes image distortion. Furthermore, high operation voltages of the MEMS scanner deter the usage of MEMS scanner in hand-held applications. In this research, a linear resonant scanner consisting of an electronically driven mechanically-resonant torsional spring-mirror system was developed for display applications. The scanner was designed according to the functional components such as compliant structure and actuator. The torsional spring which is the compliant structure was modeled with finite element analysis (FEA) and geometry studies were conducted. The optimized torsional spring with the lowest stress level was selected for the design. The actuator of air core coil (ACC) was used in the scanner; geometry study was used to maximize the magnetic forces of the ACC. The ACC of with minimum length, minimum inner radius and maximum outer radius was used. Besides, experimental analysis and FEA of the scanner showed that resonant frequency, angular displacement and stress level are affected by the magnet position on the suspended plate. After the scanner design, several characteristic studies were conducted. A nonlinear damping model is proven to be able to analyze and predict the free vibration response of the scanner based on experimental results. xxx The damping model is able to accommodate the frequency perturbation which happens when the scanner mounting is changed. The hysterical frequency response on the large scale torsional spring mechanism is first found in this research work. Furthermore, the relationship between scanning angle and driving frequency was employed for extra mechanical gain. The proposed resonant scanner extends the ability of the torsional mechanism scanner for large angular displacement of 87.1o with low voltage input of 5 V

Magnet Position Variation of the Electromagnetic Actuation System in a Torsional Scanner

A mechanically-resonant torsional spring scanner was developed in a recent study. Various methods were developed to improve the angular displacement of the scanner while maintaining the scanner frequency. However, the effects of rotor magnet radial position on scanner characteristics were not well investigated. In this study, the relationships between the magnet position and the scanner characteristics such as natural frequency, angular displacement and stress level were studied. A finite element model was created and an average deviation of 3.18% was found between the simulation and experimental results, qualifying the simulation results as a guide for further investigations. Three magnet positions on the transverse oscillating suspended plate were investigated by finite element analysis (FEA) and one of the positions were selected as the design position. The magnet position with the longest distance from the twist axis of the mirror was selected since it attains minimum stress level while exceeding the minimum critical flicker frequency and delivering the targeted angular displacement to the scanner

Magnet Position Variation of the Electromagnetic Actuation System in a Torsional Scanner

A mechanically-resonant torsional spring scanner was developed in a recent study. Various methods were developed to improve the angular displacement of the scanner while maintaining the scanner frequency. However, the effects of rotor magnet radial position on scanner characteristics were not well investigated. In this study, the relationships between the magnet position and the scanner characteristics such as natural frequency, angular displacement and stress level were studied. A finite element model was created and an average deviation of 3.18% was found between the simulation and experimental results, qualifying the simulation results as a guide for further investigations. Three magnet positions on the transverse oscillating suspended plate were investigated by finite element analysis (FEA) and one of the positions were selected as the design position. The magnet position with the longest distance from the twist axis of the mirror was selected since it attains minimum stress level while exceeding the minimum critical flicker frequency and delivering the targeted angular displacement to the scanner

Magnet Position Variation of the Electromagnetic Actuation System in a Torsional Scanner

A mechanically-resonant torsional spring scanner was developed in a recent study. Various methods were developed to improve the angular displacement of the scanner while maintaining the scanner frequency. However, the effects of rotor magnet radial position on scanner characteristics were not well investigated. In this study, the relationships between the magnet position and the scanner characteristics such as natural frequency, angular displacement and stress level were studied. A finite element model was created and an average deviation of 3.18% was found between the simulation and experimental results, qualifying the simulation results as a guide for further investigations. Three magnet positions on the transverse oscillating suspended plate were investigated by finite element analysis (FEA) and one of the positions were selected as the design position. The magnet position with the longest distance from the twist axis of the mirror was selected since it attains minimum stress level while exceeding the minimum critical flicker frequency and delivering the targeted angular displacement to the scanner

Magnet Position Variation of the Electromagnetic Actuation System in a Torsional Scanner

A mechanically-resonant torsional spring scanner was developed in a recent study. Various methods were developed to improve the angular displacement of the scanner while maintaining the scanner frequency. However, the effects of rotor magnet radial position on scanner characteristics were not well investigated. In this study, the relationships between the magnet position and the scanner characteristics such as natural frequency, angular displacement and stress level were studied. A finite element model was created and an average deviation of 3.18% was found between the simulation and experimental results, qualifying the simulation results as a guide for further investigations. Three magnet positions on the transverse oscillating suspended plate were investigated by finite element analysis (FEA) and one of the positions were selected as the design position. The magnet position with the longest distance from the twist axis of the mirror was selected since it attains minimum stress level while exceeding the minimum critical flicker frequency and delivering the targeted angular displacement to the scanner

Magnet Position Variation of the Electromagnetic Actuation System in a Torsional Scanner

A mechanically-resonant torsional spring scanner was developed in a recent study. Various methods were developed to improve the angular displacement of the scanner while maintaining the scanner frequency. However, the effects of rotor magnet radial position on scanner characteristics were not well investigated. In this study, the relationships between the magnet position and the scanner characteristics such as natural frequency, angular displacement and stress level were studied. A finite element model was created and an average deviation of 3.18% was found between the simulation and experimental results, qualifying the simulation results as a guide for further investigations. Three magnet positions on the transverse oscillating suspended plate were investigated by finite element analysis (FEA) and one of the positions were selected as the design position. The magnet position with the longest distance from the twist axis of the mirror was selected since it attains minimum stress level while exceeding the minimum critical flicker frequency and delivering the targeted angular displacement to the scanner

Genset Optimization for Biomass Syngas Operation

Although biomass is underrepresented in current methods for power generation, it has great potential to help meet the growing need for clean energy. This chapter details the modification of a gasoline-powered two-stroke genset for operation on syngas from a woodchip-powered gasifier. Generator and engine modifications along with a flexible air/fuel control system are described. Results from genset operation indicate a sustainable power output of 360 W with a biomass consumption rate of approximately 6 kg/hour. Optimum power production was achieved at an air/fuel ratio close to 1. After several hours of operation the engine was disassembled and inspected, revealing significant deposits on the piston and crank case parts, indicating that the engine would require weekly maintenance under such operating conditions

Magnet Position Variation of the Electromagnetic Actuation System in a Torsional Scanner

A mechanically-resonant torsional spring scanner was developed in a recent study. Various methods were developed to improve the angular displacement of the scanner while maintaining the scanner frequency. However, the effects of rotor magnet radial position on scanner characteristics were not well investigated. In this study, the relationships between the magnet position and the scanner characteristics such as natural frequency, angular displacement and stress level were studied. A finite element model was created and an average deviation of 3.18% was found between the simulation and experimental results, qualifying the simulation results as a guide for further investigations. Three magnet positions on the transverse oscillating suspended plate were investigated by finite element analysis (FEA) and one of the positions were selected as the design position. The magnet position with the longest distance from the twist axis of the mirror was selected since it attains minimum stress level while exceeding the minimum critical flicker frequency and delivering the targeted angular displacement to the scanner

Magnet Position Variation of the Electromagnetic Actuation System in a Torsional Scanner

A mechanically-resonant torsional spring scanner was developed in a recent study. Various methods were developed to improve the angular displacement of the scanner while maintaining the scanner frequency. However, the effects of rotor magnet radial position on scanner characteristics were not well investigated. In this study, the relationships between the magnet position and the scanner characteristics such as natural frequency, angular displacement and stress level were studied. A finite element model was created and an average deviation of 3.18% was found between the simulation and experimental results, qualifying the simulation results as a guide for further investigations. Three magnet positions on the transverse oscillating suspended plate were investigated by finite element analysis (FEA) and one of the positions were selected as the design position. The magnet position with the longest distance from the twist axis of the mirror was selected since it attains minimum stress level while exceeding the minimum critical flicker frequency and delivering the targeted angular displacement to the scanner