150c CȍǶǽڢᕮ⋛ᕧոˁǺǙǠȚɲɻ⓹۰ɩɅএઃȿɲȳǽɟɵɐɻଣҽමʸቆᇏ۠ɿʅறᗱʶȖଉ ɿৃቧ⚼ᅖଉ ɿૈ୮ ኇ̸গકӞᴻᲇકཪ⒈ᮾ᳣Ƀɻɇʀࢫ153-8904 ኇ̸ȩᬶ࠭ٚشई 4-6-1 ଉ ኇ̸ᥴᲇগકకકȤకᏡكકᲇࢫ162-8601 ኇ̸ȩᄽٚᏱ 1-3Silica mesoporous structures incorporated with phosphorus were prepared and their proton conductivity was evaluated at temperatures of up to 150c C under saturated or controlled water vapor pressure. The fixing of phosphoric acid through heat treatment after forming the mesostructure had a limited effect on the improvement in proton conductivity only in a relatively low-temperature region. The incorporation of phosphorus during mesoporous silica formation decreased the surface area but was effective in improving proton conductivity. A sample with a low PSi atomic ratio of 0.07 showed the highest proton conductivity above 10 ࢬ2 Scm ࢬ1 at 100 to 120c C under saturated water vapor pressure. A sample with a high PSi atomic ratio of 0.25 showed relatively high conductivities being maintained even at low relative humidity at 150c C. An adequate phosphorus concentration and a large surface area were found necessary for high and humidity-independent proton conductivity in mesoporous silica.
A noncontacting steel plate conveyance system using the transverse flux linear induction motor (TFLIM) is studied. The steel plate makes up the secondary of TFLIM. A combined control principle of levitation and propulsion for TFLIM is proposed. The output capacity of the power converter for control is limited by its maximum current, but the performance of TFLIM depends on its fundamental component. Then a third harmonic current injection scheme is considered for the drive system, in order to increase the fundamental component, keeping the value of the maximum current invariant.TFLIM characteristics are calculated both for the levitation and propulsion forces acting on the secondary steel plate, on the basis of a three-dimensional electromagnetic field analysing program (J-MAG Studio). In comparison with a sinusoidal current excitation, the propulsion and levitation force of TFLIM increases by 33% and 37%, respectively, when the harmonic current injection level is optimized. Thus, the harmonic current injection scheme is shown to be an effective and practical mean to realize a steel plate conveyance system. Index Terms-Combined lift and propulsion, linear induction motor, third order harmonic current injection, transverse flux machine.
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