Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

SPEED OPTIMIZATION USING VARIABLE FREQUENCY DRIVE FITTED TO DHAN FOUNDATION DEHULLER

P. HEMASANKARI, B. DAYAKAR RAO, E. SAI PRASANNA, VILAS A. TONAPI AND R. KAILAPPAN AND B.C. SANGAPPA

Abstract

Speed optimization using variable frequency drive fitted to dhan foundation dehuller were done to know the effective dehulling speed with time of dehulling in selected minor millets. The selected minor millets included proso millet, kodo millet, little millet, foxtail millet and barnyard millet. The selected speeds were 21, 28 and 35Hz. Dhan foundation dehuller has an input hopper, dehulling impeller type mechanism and an outlet for dehusked grain and an aspirator for removing the lighter weight hull that it is to be separated. 1kg of raw millet of different types were taken for dehulling experiments. Head rice recovery after dehulling is lowest for kodo millet, 8.15%±5.62 followed by barnyard millet, 26.07%±11.24, foxtail millet, 46.04%±16.90, proso millet, 53.19%±14.46 and little millet, 53.73%±11.93. Broken rice recovery ranged between 7.59 to 12.3%±1.39 for proso millet, for kodo millet, it is 5.72 to 16.49%±3.31, for little millet it ranged between 11.92 to 23.10%±3.30, for foxtail millet it is 8.88 to 20.72% ± 3.73 and for barnyard millet it is 17.35 to 35.62%±5.73. Performance index varied between 24.41 to 63.27±11.26 for proso millet, 0.75 to 18.25±5.33, in kodo millet, 18.60 to 70.73±13.27, for little millet, 12.75 to 64.85±15.62, for foxtail millet and 5.41 to 38.54±7.64 in barnyard millet. Capacity of satake polisher in polishing proso millet is 55.80 to 66.39kg/h±3.36, in kodo millet it ranges between 66.96 to 71.68kg/h±1.38, in little millet, it ranges between 44.15 to 63.7 kg/ h±6.49, in foxtail millet it ranges between 58.71 to 66.22kg/h±2.17 and in barnyard millet, it ranges between 56.32 to 69.04kg/h±3.68 from 21Hz to 35Hz speeds. At 21Hz speed, the capacity is more in proso millet, 72.43kg/h±4.78 followed by kodo millet, 66.96kg/h±4.78, barnyard millet, 61.97kg/h±4.78, foxtail millet, 58.71kg/h±4.78 and little millet, 44.15kg/h±4.78. At 28Hz the capacity is more in kodo millet, 69.95kg/h±1.57 followed by barnyard millet, 69.04 kg/h ± 1.57, foxtail millet,66.22kg/h±1.57,little millet, 63.52 kg/h±1.57 and proso millet, 61.72kg/h ± 1.57. At 35Hz the capacity is more in kodo millet, 71.68 kg/h±2.45 followed by little millet, 63.7 kg/h±2.45, proso millet, 63.21kg/h±2.45, foxtail millet, 62.49kg/h±2.45 and barnyard millet, 56.32kg/h±2.45. The values of all the experiments are as a result of 2 replications. The values obtained were significant at 5% level of significance (p0.05) and found out using SPSS 16.0 version.