The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
Shao-chin Tseng - One of the best experts on this subject based on the ideXlab platform.
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ETFA - Prototyping of a rotary/linear ultrasonic motor
2005 IEEE Conference on Emerging Technologies and Factory Automation, 2005Co-Authors: Po-jia Chen, Shao-chin TsengAbstract:The object of this research is to design and prototype a linear/rotary ultrasonic motor based upon multi-mode resonance behaviors for a piezoelectrically excited driver structure system. The whole ultrasonic motor system includes a pair of piezoactuator-equipped driver rods, a linear/rotary Driven Shaft, and a set of high-voltage power stages for energizing the piezoelectric stacks. The linear/rotary ultrasonic motor operating principle basically employs excited resonant modes of the driver structure as applying selected AC frequencies on the equipped piezostacks. Therefore, the prescribed combinational resonant modes of the driver structure result in the Driven Shaft operating in linear or rotary motions
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Design and simulations of a 2DOF ultrasonic motor
5th IEEE Conference on Nanotechnology 2005., 2005Co-Authors: Po-jia Chen, Shao-chin TsengAbstract:A 2DOF ultrasonic motor structure is designed and simulated using finite element method (FEM) in this study. The ultrasonic motor structure is consist of two resonant driver rods and one Driven Shaft between. Each driver rod is equipped with four stacked piezoelectric actuators to perform resonant functions. Different resonant modes of the driver rods, the Driven Shaft, and the overall assembly would be excited to conduct different motion characteristics. Preload and non-preload conditions for the driver rods are studied as well, and assembly of a half portion or an overall ultrasonic motor structure are simulated considering contact and constraint boundaries as well. The adequate resonant modes to perform the Driven Shaft's liner and rotary motion, respectively, arc calculated and tabulated in this study.
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Prototyping of a rotary/linear ultrasonic motor
2005 IEEE Conference on Emerging Technologies and Factory Automation, 2005Co-Authors: Po-jia Chen, Shao-chin TsengAbstract:The object of this research is to design and prototype a linear/rotary ultrasonic motor based upon multi-mode resonance behaviors for a piezoelectrically excited driver structure system. The whole ultrasonic motor system includes a pair of piezoactuator-equipped driver rods, a linear/rotary Driven Shaft, and a set of high-voltage power stages for energizing the piezoelectric stacks. The linear/rotary ultrasonic motor operating principle basically employs excited resonant modes of the driver structure as applying selected AC frequencies on the equipped piezostacks. Therefore, the prescribed combinational resonant modes of the driver structure result in the Driven Shaft operating in linear or rotary motions
Po-jia Chen - One of the best experts on this subject based on the ideXlab platform.
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ETFA - Prototyping of a rotary/linear ultrasonic motor
2005 IEEE Conference on Emerging Technologies and Factory Automation, 2005Co-Authors: Po-jia Chen, Shao-chin TsengAbstract:The object of this research is to design and prototype a linear/rotary ultrasonic motor based upon multi-mode resonance behaviors for a piezoelectrically excited driver structure system. The whole ultrasonic motor system includes a pair of piezoactuator-equipped driver rods, a linear/rotary Driven Shaft, and a set of high-voltage power stages for energizing the piezoelectric stacks. The linear/rotary ultrasonic motor operating principle basically employs excited resonant modes of the driver structure as applying selected AC frequencies on the equipped piezostacks. Therefore, the prescribed combinational resonant modes of the driver structure result in the Driven Shaft operating in linear or rotary motions
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Design and simulations of a 2DOF ultrasonic motor
5th IEEE Conference on Nanotechnology 2005., 2005Co-Authors: Po-jia Chen, Shao-chin TsengAbstract:A 2DOF ultrasonic motor structure is designed and simulated using finite element method (FEM) in this study. The ultrasonic motor structure is consist of two resonant driver rods and one Driven Shaft between. Each driver rod is equipped with four stacked piezoelectric actuators to perform resonant functions. Different resonant modes of the driver rods, the Driven Shaft, and the overall assembly would be excited to conduct different motion characteristics. Preload and non-preload conditions for the driver rods are studied as well, and assembly of a half portion or an overall ultrasonic motor structure are simulated considering contact and constraint boundaries as well. The adequate resonant modes to perform the Driven Shaft's liner and rotary motion, respectively, arc calculated and tabulated in this study.
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Prototyping of a rotary/linear ultrasonic motor
2005 IEEE Conference on Emerging Technologies and Factory Automation, 2005Co-Authors: Po-jia Chen, Shao-chin TsengAbstract:The object of this research is to design and prototype a linear/rotary ultrasonic motor based upon multi-mode resonance behaviors for a piezoelectrically excited driver structure system. The whole ultrasonic motor system includes a pair of piezoactuator-equipped driver rods, a linear/rotary Driven Shaft, and a set of high-voltage power stages for energizing the piezoelectric stacks. The linear/rotary ultrasonic motor operating principle basically employs excited resonant modes of the driver structure as applying selected AC frequencies on the equipped piezostacks. Therefore, the prescribed combinational resonant modes of the driver structure result in the Driven Shaft operating in linear or rotary motions
Satoshi Yamazaki - One of the best experts on this subject based on the ideXlab platform.
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variable speed drive unit for electric vehicle and variable speed driving method
1997Co-Authors: Takeshi Seto, Akihito Uetake, Masao Ono, Masatoshi Fukuda, Tatsuya Shimoda, Satoshi YamazakiAbstract:In an electric vehicle provided with an electric motor (M), a motor drive circuit (17) and a control circuit section (15) for outputting an operation command to the motor drive circuit, a variable speed drive unit for electric vehicles has a transmission apparatus (20) which engages or disengages a drive Shaft (7a) which receives the drive force from a propelling motor and a Driven Shaft (5a) which is interconnected with propelling wheels by an electromagnetic engagement clutch (30), the transmission apparatus has the electromagnetic clutch comprised of a first clutch (22) interconnected with the drive Shaft, a second clutch (25) having a rotational speed different from the first clutch, and an output side clutch (21) interconnected with the Driven Shaft; and the output side clutch and the first clutch or the second clutch are alternatively connected to selectively change the motor output. And, to connect the clutches mutually, the rotational speed of the clutch on the drive side is synchronized with the rotational speed of the clutch on the Driven side.
Changlin Feng - One of the best experts on this subject based on the ideXlab platform.
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Analysis of Moment Transmitted by Universal Joint in Varying Operating Condition
Mechatronics and Information Technology, 2011Co-Authors: Changlin Feng, De Shi WangAbstract:The moments transmitted by a universal joint in varying operating condition was investigated. A model of Shaft system Driven by a universal joint which consists of a driving Shaft, a Driven Shaft and a cross piece is chose. Both structure misalignment and error misalignment between the two Shafts at the universal joint was considered, and the study was based on the assumption that friction, inertia and elastic forces of the cross piece were disregarded. Two pairs of Euler angles were introduced to denote structure misalignment and error misalignment respectively, sets of reference frames were built up on the driving Shaft, Driven Shaft and cross piece. Using direction cosine matrixes to describe the relation between different frames, then the expressions of components of the transmitted moment acting on the Driven Shaft were obtained via method of vector projection. Based on engineering fact, the transmitted moment model was simplified with respect to different misalignment conditions, such as only structure misalignment or only error misalignment is considered. Then for different misalignment situations, the lateral and torsional components of the transmitted moment acting on the Driven Shaft were simulated through numerical examples. It turns out that both the lateral moment and torque components will fluctuate based on the import torque, and that due to accelerating of the driving Shaft, the fluctuation of transmitted moment will be more distinct, consequently, more complicated nonlinear dynamics behavior will arise.
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Nonlinear analysis on torsional vibration of misaligned rotor Driven by universal joint
2010 International Conference on Mechanic Automation and Control Engineering, 2010Co-Authors: Deshi Wang, Changlin FengAbstract:The nonlinear torsional vibration on rotor system Driven by universal joint was studied considering both natural structure misalignment and actual error misalignment. Firstly, the equation with weakly nonlinear vibration was derived after analyzing the kinematic relation about Driven Shaft and driving Shaft. Secondly, the periodic solution was obtained corresponding to principal resonance by multi-scale approach, including amplitude-frequency characteristic and phase-frequency characteristic curves. Then the stable region and unstable region on the amplitude and the phase of the periodic solution were deduce using Lyapunov's approximate stability theory, which varied with the tunable parameter. At last, the driving Shaft's stable periodic motion of the first approximation and its calculation simulation were carried out according to the kinetic relation about Driven Shaft and driving Shaft. The results above indicate the fundamental characteristic of the nonlinear dynamic on the misaligned rotor, also applying the foundation for advanced bifurcation analysis.
M. Muhr - One of the best experts on this subject based on the ideXlab platform.
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Electrical issues associated with sea-water immersed windings in electrical generators for wave- and tidal current-Driven power generation
IET Renewable Power Generation, 2009Co-Authors: J. Fletcher, T. Judendorfer, M. Mueller, N. Hassanain, M. MuhrAbstract:For the majority of proposed wave- and tidal current-Driven power generation applications, the electrical generators are submerged in sea water, frequently at many metres of depth. The environment places significant stress on the rotating or translating seals between the Driven Shaft and the electrical generator leading to reduced reliability and lifetime. A potential solution is to eliminate the seal, thereby flooding the generator and allowing sea water to circulate around the Shaft, windings and rotor of the machine. The impact of immersing the windings of the machine in sea water is assessed here. Specifically, the impact that the insulation has on the leakage capacitance as well as the consequent impact the leakage capacitance has on current and voltage oscillations in the switching converter used to excite the winding is assessed. Thermal tests are conducted to assess the impact of the insulation on the thermal conductance of the coil-insulation system. Experimental evidence is provided.
