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A modified structure of operational transconductance amplifier (OTA) in CMOS 65-nm technology with signal-current enhancer and slew-rate (SR) helper is presented in this paper. The bias current is chosen to be lower than 0.1 μA to reduce the overdrive voltage requirement and thus make the amplifier survive under 0.7 V supply. An SR helper is also introduced to improve the transient performance. As...
The increasing connection of distributed generators to distribution network have greatly impacted on the performance peculiarity of both power source and electric load. In order to coordinate the operation between source and load, a demand side management operation strategy is discussed in this paper, based on the technical characteristics of active distribution network and differential electricity...
The paper studies the control technique of without position sensor for permanent magnet brushless motor(BLDCM). According to the mathematical model of BLDCM, the paper derives the working principle of commutation principle for using the third harmonic back electromotive force(EMF). Compared with the other technologies of without position sensor, the method of third harmonic detection can be easily...
For the torque ripple and flux pulsation big shortcomings of direct torque control (DTC) for permanent-magnet synchronous-motor (PMSM), the peper proposed an improved direct torque control strategy. Based on the SVPWM of DTC method for PMSM, the paper proposed an improved DTC according to the flux linkage error space Vector modulation ( FESVM ). The paper analysed the working principle of the improved...
Dividing the rotor-screw system of machine tool into a multi-degree-of-freedom torsion system, this paper educes the transfer function model of the mechanism including torsion vibration modes of the first two orders. Consequently, a mechatronic model of servo control system of feed drive including lead-screw torsion vibration is built. Based on this model, the simulation comparisons of dynamic characteristics...
An optical microscope‐focused laser beam technique was employed to effectively microstructure uniform patterns on graphene oxide nanosheets in a fast and controlled manner.
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