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S. Rajagopal ¹, S. S. Dash ¹

Affiliations
1 Sathya Bama University, IN

Abstract

The aim of this paper is to present that four level converters are most suitable for excitation of high speed switched reluctance motor drives. Switched reluctance motor drives are preferred for high speed industrial applications because they offer a wide speed range and that their are torque/inertia ratio is very high . Conventional asymmetric convertors are not suitable for excitation of high speed switched reluctance motor drives because the excitation time is very short. While exciting switched reluctance motors the excitation current in a phase should be switched on at the time inductance begins to rise and it must build up sufficiently during the raising period of the inductance to produce required positive torque output. Further the excitation current must be reduced to zero before the inductance begins to fall. During its fall time of excitation current it should not extend to the decreasing period of inductance to avoid production of negative torque. Four level convertor is recommended to achieve the above mentioned facts in excitation of high speed switched reluctance motor drives. The Four level convertor has an additional capacitor and an active power switch. The high voltage in the charged capacitor is applied to the phase winding in the fast excitation mode and the phase current gets rapidly decreased without extending to the negative region during demagnetisation mode. The simulation results of such a four level convertor used for operation of high speed switched reluctance motor drives show that current stress is less than the voltage stress during excitation conditions.

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V. G. Butala ¹, S. Rajagopal ¹

Affiliations
1 Department of Animal Nutrition and Dairy Science, College of Veterinary Science and Animal Husbandry, Gujarat Agricultural University, Sardar Krushinagar, 385 506, IN

Abstract

Cockerels are the discards of commercial poultry production and are disposed off at very nominal price. Rearing of cockerels with considerably low inputs, meagre managemental case and practices offer sustenance to marginal and small farmers compared to broilers which demand cost intensive feeding regimen. The rapidly growing/developing broilers require diets which are rich in energy and proteins, thus comparing with the human diets, thereby necessitating the usage of diets based on agroindustrial by products like deoiled rice bran supplemented with non-edible fats like fallow.

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S. RAJAGOPAL ¹, K. PITCHUMANI ²

Affiliations
1 School of Chemistry, Madurai Kamaraj University, Madurai 625 021, India., IN
2 Manonmaniam Sundaranar University, Thirunelveli 627 012, India., IN

Abstract

No Abstract.

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