4 – DC Machine 1. Describe operation of DC machine (motor and generator) using illustrations. Specifically explain the purpose of: a. brushes d. armature winding b. split ring commutators e. effect of back emf (in operation) c. field winding 2. Draw the different configurations of DC machines a. shunt c. separately excited b. series 3. Develop‚ using Kirchhoff’s laws‚ equation for Ea (armature voltage) in both motoring and generating mode. 4. Describe three (3) methods of speed control in DC machines
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DC to AC Inverter Assignment # 2/ Spring 2013 CE721 Ahmad Ghaffari‚ 1203840 Submit Date: Tuesday 19‚ 2013 Abstract DC-AC inverter is a device that converts a direct current (DC) into an alternating current (AC). When there is no AC main power for applications in caravans‚ remote area and etc.‚ this tool is very suitable to use. It mainly converts a DC source (like a car’s battery) to an AC source (230V) to use for power application like
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Under Washington case law‚ plaintiffs are required to prove causation with expert testimony if alleged injury involves obscure medical factors. [cite]. The trickier question is whether the expert needs to demonstrate a direct causal link between the alleged injuries and the negligent act or if the expert merely must demonstrate that the plaintiff’s injuries are of a type that can be caused by the negligent act. Washington courts have come down on both sides of this question. I. Plaintiffs are Required
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A DC motor is a mechanically commutated electric motor powered from direct current (DC). The stator is stationary in space by definition and therefore so is its current. The current in the rotor is switched by the commutator to also be stationary in space. This is how the relative angle between the stator and rotor magnetic flux is maintained near 90 degrees‚ which generates the maximum torque. DC motors have a rotating armature winding but non-rotating armature magnetic field and a static field
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1999 Application Summary THE RITZ-CARLTON® HOTEL COMPANY‚ L.L.C. Copyright © 2000 by THE RITZ-CARLTON® HOTEL COMPANY‚ L.L.C. – All Rights Reserved THE RITZ-CARLTON® HOTEL COMPANY‚ L.L.C. at a Glance Products and Services: The Ritz-Carlton Hotel Company‚ L.L.C. develops and operates luxury hotels for others. The hotels are designed and identified to appeal to and suit the requirements of its principal customers who consist of: (1) Meeting Event Planners and (2) Independent Business
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Maurice Aguirre Washington DC: Lobbying active in the United States Lobbying in America refers to paid activity on which distinctive interests retain the services of well-connected experienced advocates‚ typically lawyers‚ to argue for focused regulations in decision making bodies for example the United States Congress. It’s just a highly provocative phenomenon‚ usually seen in a negative light by reporters and the US public. Even while lobbying is certainly theme to thorough plus typically
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| | | | | | | DC Motors | | | | | | | | | | | | | The direct current (DC) motor is one of the first machines devised to convert electrical power into mechanical power. Permanent magnet (PM) direct current converts electrical energy into mechanical energy through the interaction of two magnetic fields. One field is produced by a permanent magnet assembly; the other field is produced by an electrical current flowing in the motor windings. These two fields result in a torque
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of them are easily recognizable as the United States capital city. II. Washington D.C. is the second most visited city I the United States. Also it is a good place to visit. III. Today‚ I will persuade my audience about Washington D.C. also I will provide the history about it. A. The city is mainly based on government and everything from museums to mansion brings millions of tourists each year. B. Washington has a growing‚ diversified economy of professional and business service jobs
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Electrical Machines Electrical Machine Stationary Transformer Rotating DC AC Motor Induction Generator Motor Generator Synchronous Motor Generator Electrical Generator / Motors An electric generator converts mechanical energy into electrical energy. An electric motor converts electrical energy into mechanical energy. Mechanical Input Electrical input ELECTRICAL MACHINES Generator ELECTRICAL MACHINES Motor Electrical Output Mechanical output
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Types of DC Motors and DC Generators MOTORS – convert electrical energy to mechanical energy Motors and generators are the most frequent used electrical machines. ❖ Generators action can take place when and only when‚ there is a relative motion between conducting wires and magnetic lines of force. ❖ Electric motor is in operation when it is supplied with electrical energy and develops torque‚ that is‚ a tendency to produce rotation. ❖ In DC generator‚ the armature winding is mechanically
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