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The impact of position sensing dynamics, including time-delays caused by magnetics, electrical transmission of sensed signals and A/D conversion, on feedforward current control of permanent magnet synchronous machine (PMSM) drive systems are presented in this paper. Further, the effect of misalignment of the position sensor zero with the machine back-EMF is also presented. The different error sources...
To enable autonomous driving, a computing stack must simultaneously ensure high performance, consume minimal power, and have low thermal dissipation—all at an acceptable cost. An architecture that matches workload to computing units and implements task time-sharing can meet these requirements.
For multi-channel synthetic aperture radar (SAR), it is an essential task to estimate the covariance matrix of a particular resolution cell across channels. When sparsity is present in SAR imaging, compressive sensing (CS) has shown its superiority in both reducing the SAR system complexity and enhancing the performance. However, existing CS methods do not work effectively with multi-channel SAR systems...
A low quiescent current digital low-dropout (D-LDO) voltage regulator with fast-transient response time is proposed for self-powered wireless sensor applications operating at near/subthreshold supply voltage. The D-LDO regulator incorporates both hill-climbing and binary search algorithms (HCBS) in the control logic, thus leveraging on each other's strengths to minimize the output voltage's ripple...
The Piezoelectric Actuator Drive (PAD) is a precise piezoelectric motor generating high-torque rotary motion, which employs piezoelectric stack actuators in a wobble-style actuation to generate rotation. The piezoelectric stacked ceramics used as the basis for motion in the motor suffer from hysteretic nonlinearities. In order to model these nonlinearities, the first-order hysteresis reversal curves...
Gait analysis is considered as an important process which has been wildly adopted in many clinical applications to identify and quantify the lower body functioning impairment of hémiplégie patients. On contrary to the traditional measures which were based on manual observation, numerous researches in recent years have been carried out on utilizing modern assistive devices to analyze gait pattern and...
Sn-rich Au-Sn solder bonding has been systematically investigated for low cost and low temperature wafer-level hermetic packaging of high-end MEMS devices. The AuSn2 phase with the highest Vickers-hardness among the four stable intermetallic compounds of Au-Sn system makes major contribution to the high bonding strength. The maximum shear strength of 64 MPa and a leak rate lower than 1 × 10−7 torr·l/s...
Position information is important for spatial information grids. In accurate position of datum may lead to mistake decisions or even disastrous actions. In this paper, we study the problem of localization for spatial information grid in underwater environments. There are many challenges facing the localization in underwater environments, because the unavailability of radio frequency. Besides, there...
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