Xem 1-17 trên 17 kết quả A-c generators
  • Most students of electricity begin their study with what is known as direct current (DC), which is electricity °owing in a constant direction, and/or possessing a voltage with constant polarity. DC is the kind of electricity made by a battery (with de¯nite positive and negative terminals), or the kind of charge generated by rubbing certain types of materials against each other. As useful and as easy to understand as DC is, it is not the only \kind" of electricity in use.

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  • AC drives using PWM techniques content presentation: Power conversion unit, PWM generator, types of control, voltz/hertz, sensorless vector, field oriented control, sensorless field oriented control

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  • From the principles of electrical engineering it is known that the 3-phase quantities of the 3-phase AC machines can be summarized to complex vectors. These vectors can be represented in Cartesian coordinate systems, which are particularly chosen to suitable render the physical relations of the machines. These are the field-orientated coordinate system for the 3- phase AC drive technology or the grid voltage orientated coordinate system for generator systems.

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  • The level of basic services accessible to Mexican households has improved strongly in past decades. According to the 12th population census of 2000, water is available now in 89.7% of all households (up from 79.4% in 1990) and power reaches 95.4% of all households (up from 87.5% in 1990). For exporters of high quality consumer products, the penetration of more sophisticated products and/or services is more relevant: Tables 7 and 8 give an overview of recent data, including further refinements according to the socio-economic level and the region of residence respectively.

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  • Introduction to AC machine, synchronous generators, synchronous motors, three phase Induction machines, three phase induction motors, induction generators, induction regulators As the main contents of the document "Electrical machines 2". Invite you to consult the text book for more documents serving the academic needs and research.

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  • Increases in intracellular [Ca 2+ ] occur synchronously between cells in the neuroepithelium. If neuroepithelial cells were capable of generating action potentials synchronized by gap junctions (direct current electrical coupling), the influx of Ca 2+ through voltage-activated Ca 2+ channels would lead to a synchronous increase in intracellular [Ca 2+ ].

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  • With the development of the technology and the way in which human labour is getting minimized and the comforts increasing tremendously the use of electrical energy is ever increasing.... The AC voltages generated may be single phase or 3-phase depending on the power supplied. For low power applications single phase generators are preferable. The basic principles involved in the production of emf and the constructional details of the generators are discussed below.

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  • Các từ viết tắt ĐIỀU KHIỂN CÔNG SUẤT TRONG THẾ HỆ THÔNG TIN DI ĐỘNG 3UMTS CÁC TỪ VIẾT TẮT 3G Third Generation Cellular Hệ thống thông tin di động thế hệ thứ ba 3 GPP Third Generation Patnership Project Dự án hợp tác thế hệ 3 A AC AI AICH A-P ATM AS Admission Cotrol Acquistion Indicator Acquistion Indication Channel Access Preamble Asynchoronous Transfer Mode Access Slot Điều khiển cho phép Chỉ thị bắt Kênh chỉ thị bắt Tiền tố Kiểu truyền di bộ Khe truy nhập B BER BCH BMC Bit Error Rate Broadcast Channel...

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  • HỆ THỐNG THÔNG TIN THẾ HỆ 3G CÁC TỪ VIẾT TẮT 3G Third Generation Cellular Hệ thống thông tin di động thế hệ thứ ba 3 GPP Third Generation Patnership Project Dự án hợp tác thế hệ 3 A AC AI AICH A-P ATM AS Admission Cotrol Acquistion Indicator Acquistion Indication Channel Access Preamble Asynchoronous Transfer Mode Access Slot Điều khiển cho phép Chỉ thị bắt Kênh chỉ thị bắt Tiền tố Kiểu truyền di bộ Khe truy nhập B BER BCH BMC Bit Error Rate Broadcast Channel Broadcast/Multicast Control Tỷ số bit lỗi Kênh quản...

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  • ÐỘNG CÕ ÐIỆN ÐỒNG BỘ PHẦN I: MỤC ÐÍCH When you have completed this exercise, you will be to demonstrate how to start a synchronous motor as well as some characteristics of a synchronous motor using the synchronous Motor/ Generator module. PHẦN II: TÓM TẮT LÝ THUYẾT Ðặc ð iểm thú vị nhất của ð ộng cõ ð ồng bộ ba pha là khả nãng vận hành với tốc ð rotor bằng tốc ð của từ trýờng quay, vận hành tại hệ số công suất bằng 1, ộ ộ và có khả nãng cung cấp công suất phản kháng cho nguồn ð AC...

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  • EURASIP Journal on Applied Signal Processing 2003:3, 312–316 c 2003 Hindawi Publishing Corporation Chebyshev Functions-Based New Designs of Halfband Low/Highpass Quasi-Equiripple FIR Digital Filters Ishtiaq Rasool Khan Department of Information and Media Sciences, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu-ku, Kitakyushu 808-0135, Japan Collaboration Center, Kitakyushu Foundation for the Advancement of Industry, Science and Technology, 2-1 Hibikino, Wakamatsu-ku, Kitakyushu 808-0135, Japan Email: ir khan@hotmail.

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  • A synchronous machine is an ac rotating machine whose speed under steady state condition is proportional to the frequency of the current in its armature. The magnetic field created by the armature currents rotates at the same speed as that created by the field current on the rotor, which is rotating at the synchronous speed, and a steady torque results. Synchronous machines are commonly used as generators especially for large power systems, such as turbine generators and hydroelectric generators in the grid power supply. ...

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  • Birch (1979) is generally considered to have provided the igniting spark to the area of small business research (e.g., Acs et al., 2008; Landström, 2005). He did so by empirically demonstrating that small firms generated most new jobs in the U.S. economy, which went against the prevailing view at that time. The interest in HGFs originates from this research, as further investigations showed that most small firms did not grow at all, and that job growth emanates from a small number of fast growing firms.

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  • Generated by Foxit PDF Creator © Foxit Software http://www.foxitsoftware.com For evaluation only. 770 CHÚ THÍCH 322 CHÚ THÍCH 771 82 Ăng-xê-lát-đơ (ha y là Ăng-k ê-l át -đ ơ), t he o t hầ n t hoại c ổ Hy Lạ p, là một trong nhữ ng ngư ời k hổng l ồ đã c hiế n đấ u với c ác vị t hầ n t rê n núi Ô-lim-pơ. 292. 83 Đoạ n t rí ch có cải bi ê n t rong "Thơ hai c â u" c ủa Lút -ví c h xứ Ba -vi -e. Nhữ ng c â u t...

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  • cAMP generation in bacteria is often stimulated by sudden, but lasting, changes in extracellular conditions, whereas intracellular cAMP concen-trations quickly settle at new levels. As bacteria lack G-proteins, it is unknown how bacterial adenylate cyclase (AC) activities are modulated. Mycobacterium tuberculosishas 15 class III AC genes;

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  • The second generation CCS is developed at the same time as Mozambique reaches the last stage of the implementation of its second Poverty Reduction Programme (PARPA – Plano de Acção para a Redução da Pobreza Absoluta), and as the country prepares to assess its achievements, and review the challenges and constraints relating to the acceleration of interventions for the achievement of the Millennium Development Goals (MDGs).

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  • This chapter include all of the following content: Elementary concepts, introduction to AC and DC machines, MMF of distributed windings, magnetic fields in Rotating machinery, rotating MMF Waves in AC machines, generated voltage,...

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