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DepositOnce: Home
DepositOnce: Home

... rare-earth high-energy permanent-magnet (PM) electrical machines with new topology. Two of the designed machines can be used as directly driven wind energy generators. ...
Massachusetts Institute of Technology
Massachusetts Institute of Technology

... Simple to build and rugged, offer reasonable asynchronous performance: a manageable torque-speed curve,stable operation under load,and generally satisfactory efficiency.Because they are so widely used, they are worth understanding. In addition to their current economic importance, induction motors a ...
DC Machines
DC Machines

... and slots 13 to 16 under south pole. The poles are shown with shaded areas above the active lengths (coil sides) of the coils. Considering generator mode of action and direction of motion from left to right (i.e., in clockwise direction of rotation of the cylindrical armature), we can apply right ha ...
Document
Document

L.M. Lorilla, T.A. Keim, J.H. Lang, and D.J. Perreault, “Topologies for Future Automotive Generators – Part I: Modeling and Analytics,” 2005 IEEE Vehicle Power and Propulsion Conference, October 2005, pp. 819-830.
L.M. Lorilla, T.A. Keim, J.H. Lang, and D.J. Perreault, “Topologies for Future Automotive Generators – Part I: Modeling and Analytics,” 2005 IEEE Vehicle Power and Propulsion Conference, October 2005, pp. 819-830.

Optical Nanotransmission Lines: Synthesis of Planar Left
Optical Nanotransmission Lines: Synthesis of Planar Left

... Similar formulas may be derived for more complex shapes for the nano-particles. In particular, a DPS nano-particle corresponds to a nano-capacitor, since its permittivity is positive, whereas a plasmonic nano-particle acts as a nano-inductor as observed from outside, due to its negative permittivity ...
Navy Electricity and Electronics Training Series
Navy Electricity and Electronics Training Series

Understanding Applications, Uses Key To Solenoid Valve
Understanding Applications, Uses Key To Solenoid Valve

... type best suits your application’s needs. Direct-acting valves open or close orifices by direct action of the core; pilot-operated valves for larger lines or higher pressures supplement this direct action by utilizing line pressure to open larger orifices while keeping solenoid size small. Normally ...
MODELING OF CURRENT DENSITY IN THICK FILM RESISTORS
MODELING OF CURRENT DENSITY IN THICK FILM RESISTORS

... where A is area of resistor with width W and length L, while these dimensions are designed to setting resistance as it is required. But variability of parameters of manufacturing causes that value of resistance is not accurate. Therefore, parameters W and L are designed so that resistance is it is p ...
and magnetism - Ms. Athena Klock Science Teacher Pine Middle
and magnetism - Ms. Athena Klock Science Teacher Pine Middle

... Have a second participant come to the front and empty the contents of Bag B onto the table. Ask them to predict, based on the findings of the previous test, which objects will be attracted to the magnet. Upon actual testing, they will discover that only some of the metals in Bag B are attracted. 3. ...
Lecture 4: Transformers
Lecture 4: Transformers

... 1880s was transmitting DC. It was designed for low voltages (safety and difficulties in voltage conversion); therefore, high currents were needed to be generated and transmitted to deliver necessary power. This system suffered significant energy losses! The second generation of power distribution sy ...
Rotor flux oriented control of induction machine based drives with
Rotor flux oriented control of induction machine based drives with

Modeling of Eddy-Current Loss of Electrical Machines and Transformers
Modeling of Eddy-Current Loss of Electrical Machines and Transformers

Soldering - TeacherWeb
Soldering - TeacherWeb

RT8162A - Richtek Technology
RT8162A - Richtek Technology

L-26(TB)(ET) ((EE)NPTEL)
L-26(TB)(ET) ((EE)NPTEL)

AN-912: Driving a Center-Tapped Transformer with a Balanced Current-Output DAC
AN-912: Driving a Center-Tapped Transformer with a Balanced Current-Output DAC

Transformer Manufacturing Processes
Transformer Manufacturing Processes

... • With ZnO-discs : up to 1050 kV BIL, Without ZnO-discs : up to 450 kV BIL if impulsed and up to 950 kV BIL if not impulsed • Easy to wind, Uniform Amp-turns distribution, Robust winding, especially when MW is used on the edge • Medium to high paper insulation thickness needed, due to the voltage di ...
experiments on magnetic transport, magnetic trapping, and bose
experiments on magnetic transport, magnetic trapping, and bose

NVIDIA® DirectTouch™ Architecture  Whitepaper
NVIDIA® DirectTouch™ Architecture Whitepaper

30_InstructorSolutionsWin
30_InstructorSolutionsWin

... EXECUTE: (a) The induced emf points from b to a, in the direction of the current. Therefore, the current is decreasing and the induced emf is directed to oppose this decrease. (b) E  L i / t , so i/t  Vab /L  (1.04 V) /(0.260 H)  4.00 A/s. In 2.00 s the decrease in i is 8.00 A and the curren ...
Magnetic resonance imaging of alternating electric currents
Magnetic resonance imaging of alternating electric currents

Balun Project
Balun Project

... may be switched. B and D are not connected together. This balun is good for connecting a balanced to an unbalanced line. This balun will not lower a high swr but by choking common mode currents it smooths the transition between lines of two different impedances. This is often called a Guanella or C ...
Document
Document

... Describe with the aid of a labeled diagram an experiment to verify Faraday's Law of electromagnetic induction. (6 marks) ...
RT8168B - igorx.irk.ru
RT8168B - igorx.irk.ru

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Magnetic core

A magnetic core is a piece of magnetic material with a high permeability used to confine and guide magnetic fields in electrical, electromechanical and magnetic devices such as electromagnets, transformers, electric motors, generators, inductors, magnetic recording heads, and magnetic assemblies. It is made of ferromagnetic metal such as iron, or ferrimagnetic compounds such as ferrites. The high permeability, relative to the surrounding air, causes the magnetic field lines to be concentrated in the core material. The magnetic field is often created by a coil of wire around the core that carries a current. The presence of the core can increase the magnetic field of a coil by a factor of several thousand over what it would be without the core.The use of a magnetic core can enormously concentrate the strength and increase the effect of magnetic fields produced by electric currents and permanent magnets. The properties of a device will depend crucially on the following factors: the geometry of the magnetic core. the amount of air gap in the magnetic circuit. the properties of the core material (especially permeability and hysteresis). the operating temperature of the core. whether the core is laminated to reduce eddy currents.In many applications it is undesirable for the core to retain magnetization when the applied field is removed. This property, called hysteresis can cause energy losses in applications such as transformers. Therefore, 'soft' magnetic materials with low hysteresis, such as silicon steel, rather than the 'hard' magnetic materials used for permanent magnets, are usually used in cores.
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