Analysis of parameter effects on thrust force and optimum driving frequency in an electrostatic induction dielectric sheet conveyor
In recent years, electrostatic induction has been introduced as a new approach for transporting dielectric sheets. Electrostatic Induction Sheet Conveyor (EISC) is a kind of electrostatic induction actuator which can directly handle dielectric sheet objects, such as papers and plastic films in asynchronous state. The capability of sheet handling demands more studies to recognize parameters influencing thrust force and optimum driving frequency of dielectric sheets in this actuator. In this paper, using the proposed model in previous work, the effect of parameters including geometric parameters of slider and stator, electrical properties of dielectric sheet and environmental conditions on thrust force and optimum driving frequency of the actuator were analytically investigated.
Film actuators: Planar, electrostatic surface-drive actuators
The authors present a variety of surface-drive film actuators and discuss their characteristics. An actuator consisting of a stator with three-phase 420 mu m-pitched electrodes and a slightly conductive slider was developed previously. A finer 100 mu m-pitched stator was fabricated and operated. A two-phase stator, whose fabrication is easier, was developed, and a two-phase 50 mu m-pitched stator was fabricated and tested. The need for conductivity on the slider narrows the application field of the actuator. An ion-charged motor which can drive most thin insulating films and uses an air ionizer to give charges on the slider was developed. The produced motive force is numerically and experimentally analyzed. The optimal gap between the electrodes and the slider surface is found to be around 20% of electrode pitch. The 100 mu m-pitched stator drives a slider at +or-250 V, 1000 Hz, producing 20 N/m/sup 2/ at maximum. Comparison between developed actuators demonstrates the advantages of fabricating fine electrodes.<<ETX>>
Chemical-Looping Combustion of Biomass in a 10 kWth Reactor with Iron Oxide As an Oxygen Carrier
Chemical-looping combustion of biomass was carried out in a 10 kWth reactor with iron oxide as an oxygen carrier. A total 30 h of test was achieved with the same batch of iron oxide oxygen carrier. The effect of the fuel reactor temperature on gas composition of the fuel reactor and the air reactor, the proportion of biomass carbon reacting in the fuel reactor, and the conversion of biomass carbon to CO2 in the fuel reactor was experimentally investigated. The results showed that the CO production from biomass gasification with CO2 was more temperature dependent than the CO oxidation with iron oxide in the fuel reactor, and an increase in the fuel reactor temperature produced a higher increase for the CO production from biomass gasification than for the oxidation of CO by iron oxide. Although the conversion of biomass carbon to CO2 in the fuel reactor decreased with the increase of the fuel reactor temperature, there was a substantial increase in the proportion of biomass carbon reacting in the fuel react...