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A fault-tolerant direct torque control (DTC) strategy for a brushless dc (BLDC) motor with a single sided matrix converter (SSMC) for an electrohydrostatic actuator system in aerospace application is proposed in this paper. The voltage is divided into seven levels, a torque hysteresis control is applied to each phase, voltage of different levels are provided to the motor to control the torque. A Matlab/Simulink...
This paper proposes an improved stator flux control algorithm based on the torque feedforward control technique for interior permanent magnet synchronous motor (IPMSM). The proposed flux linkage control algorithm can prevent the d and q- axis voltages from saturation and improve the dynamic behavior. A lookup table is used in the torque feedforward control technique, which outputs the desired d and...
The high power permanent magnet (PM) traction drive has recently been highlighted due to its promising qualities such as high efficiency and power density. For better performance, a robust, efficient and reliable control and driving scheme needs to be designed. In this Paper a control scheme is designed which based on Most Torque Per Ampere (MTPA) strategy to obtain high power density and is specially...
The wireless power transfer characteristics of system architectures with single transmitter and multiple receiver coils are investigated. The transferred power and energy efficiency are presented through derivations of equations based on equivalent circuit model, which is validated against simulation results using Matlab SIMULINK and Ansoft Maxwell. The mutual coupling between receivers significantly...
Selection of working fluid is crucial in designing an ORC system. A selection process to get potential pure working fluids for medium-temperature ORC processes has been investigated. Stability, safety and environmental aspects were considered firstly. Then vapor specific volume, latent heat, normal boiling point and critical point of refrigerants and non-refrigerating fluids are analyzed and net power...
A feedback active method is proposed to control the flow-induced vibration (FIV) of the head gimbals assembly (HGA) through suppressing the pressure fluctuations around the HGA. Firstly pressure fluctuations and FIV measurements are carried out around the HGA in a working hard disk drive, and the results show a high correlationship between the spectra of the HGA's FIV and the pressure fluctuations...
This paper summarizes our recent investigations of nano-wire n type tunneling field effect transistor (n-TFET) reliability by experimental measurements and physical analysis [1-3]. Large PBTI and HC degradations which are very different from those in conventional n-MOSFETs were observed. The results are interpreted by different degradation mechanism in TFET.
The self-adaptation and self-studying features of neural networks have been combined with the logical reasoning ability of fuzzy system to produce a fuzzy system based neural networks, BP arithmetic is used to adjust system parameters. Finally the fuzzy neural networks model with the wind farms calculation is established, as compared with the model of multi-variant linear regression, the fuzzy neural...
Large and high-quality single crystal flakes of [Ca2CoO 3]0.62[CoO2] compound were grown from Co3O4 and CaCO3 reagents with chloride flux. Typical single crystal flake size is about 5times5times0.02 mm 3. Obtained crystal flakes were consolidated by the spark plasma sintering (SPS) technique at 1100 K for 1 h. Grain alignment was checked by XRD and also was confirmed by SEM observations on the fractured...
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