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Sewing Machines are arranged dependent on their usefulness, and they have likewise been ordered relying upon their highlights like sewing, knitting and weaving.
According to the requirements of one industrial sewing machine (ISM) manufacture, a kind of digital servo system for ISM has been designed in this paper. First of all, SVPWM has been analyzed in driving Permanent Magnet Synchronous Machine (PMSM) carefully. Afterwards, a reliable method adopted for both speed and position measurement without photoelectric encoder has been presented. Then, considering about the speed regulating for the servo system, nonlinear PI control algorithm with the control strategy of single closed loop has been proposed. And meanwhile, a `Five Steps' algorithm for needle location of the system has been discussed in detail. At last, with both simulation and test results, the validity and veracity of the control strategies for motor driving, motor speed regulating and needle location of ISM can be proved effectively.
Electricity is the major source of power for a country's most of the economic activities. In modern world, standard of living sometimes measured in terms of per capita electricity consumption. As in July 2012, Bangladesh has an installed electricity generation capacity of 8.1 GW; around 75% of this capacity is considered to be 'available' for use. Only 40% of the population of Bangladesh has access to electricity. Problems in the electric power sector of Bangladesh include corruption in administration, high system losses and delays in completion of new plants, low plant efficiencies, erratic power supply, electricity theft, blackouts and shortages of funds for power plant maintenance. On the whole, the country's generation plants have been unable to meet system demand over the past decades.Presently, total generation capacity is 8315 MW. Of this capacity 4544 MW is from public sector and 3771 MW is from the private sector, which is 55% and 45% respectively of the total generation capacity.
Being the biggest contributor to the country's foreign exchange(around 76 percent) and GDP (around 13 percent), employing over 2.2 million people, the importance of nurturing a sector as vibrant and thriving as the garments industry, could not be emphasized enough. With export of readymade garments reaching 15 billion in 2010 and predictions of it rising to 19 billion or more in the next two years, it is obvious that the industry is growing at an exponential speed (with 12% average annual growth rates). Greater demand for our garments abroad indicates the improvement in quality of the products as well as greater customer confidence, which translates to further expansion of the industry, more employment, more consumers in the domestic market and a huge boost to the economy.
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