Informatics Publishing Limited

N. Ravi ¹

Affiliations
1 Sree Narayana College, Quilon, IN

Abstract

No Abstract.

Full Text

   

S. K. Shrikanth Rao ¹, N. Ravi ²

Affiliations
1 Department of Electronics and Communication Engineering, VCET, Puttur D.K 574201
2 Permanent Magnet Drives, Crompton Greaves Ltd, Mumbai, IN

Abstract

The drop in prices of rare-earth permanent magnet (PM) materials and progress in power electronics have played an important role in the development of PM brushless machines in the last three decade. These machines have recently become mature and their high efficiency, power density and reliability has led to PM brushless machines successfully replacing D.C commutator machines and cage induction machines in many areas. The axial flux PM (AFPM) brushless machine, also called the disctype machine, is an attractive alternative to its cylindrical radial flux counter part due to the pancake shape, compact construction and high torque density. Axial flux machines have undergone a tremendous development in the past decade and are widely used in Pump, Fan, Wheel, Floppy disc drives, wind power generation and high performance direct drive servo applications. With the advent of modern high-energy magnets (like Neodymium Iron Boron (NdFeB)), slotless and coreles structures are possible resulting in small overall size, weight and less torque ripple (low cogging torque). The power range of AFPM brushless machine is now from a fraction of a watt to sub-MW. The main objective of this work is to develop a design methodology for axial flux machine from the basic sizing and force equation.

Keywords

Axial Flux, Radial Flux, Torque, Output Equation, Finite Element Analysis, Discretized, Lorentz Force Equation.

Full Text

     

K. M. Adarsh , N. Ravi , C. Ashwini , V. Ramesh

Abstract

Giant cell tumors comprise approximately 4% of all bone tumors. Usually GCT occurs as eccentric epiphyseal lytic lesion in a mature skeleton, commonly along the long bones. Uncommonly they are seen to occur in calcaneus, ribs, carpal bones and patella. We report a case of Giant Cell Tumor of Patella in an 18 year old male presenting with history of pain and swelling of right knee. The diagnosis was made on radiologic investigations and was confirmed on histopathological examination.

Full Text

   

N. Ravi ¹, T. Subba Rao ², T. Jayachandra Prasad ³

Affiliations
1 Department of Physics & Electronics, RGM Engg College, JNT University, Anantapur-518501, Andhra Pradesh, IN
2 Department of Physics, Sri Krishnadevaraya University, Anantapur-515003, Andhra Pradesh, IN
3 Department of ECE, RGM Engg College, JNT University, Anantapur-518501, Andhra Pradeh, IN

Abstract

This paper presents C²Mos register Pipelined Modified Booth Multiplier (PMBM) to improve the speed of the multiplier by allowing the data parallel. The pipeline registers are designed with two p-mos and two n-mos transistors in series which is C²Mos. Wallace multiplier also used to improve the speed of the multiplier with Carry Save Addition. 16-Transitor Full adders are used for better performance of the multiplier. The PMBM is 28.51% more speed than the Modified Booth Multiplier (MBM). This is calculated with TSMC 0.18 um technology using Hspice.

Keywords

Modified Booth Multiplier, Pipeline, Register, Wallace Tree.

Full Text