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Produce commercial electric machines of direct current

Produce commercial electric machines of direct current

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VIDEO ON THE TOPIC: Why Use AC Instead of DC at Home??

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Content:

Alternating & Direct Current: AC DC Electricity

If you wish to contribute or participate in the discussions about articles you are invited to join SKYbrary as a registered user. An Aircraft Electrical System is a self contained network of components that generate, transmit, distribute, utilize and store electrical energy. An electrical system is an integratal and essential component of all but the most simplistic of aircraft designs. The electical system capacity and complexity varies tremendously between a light, piston powered, single engine GA aircraft and a modern, multiengine commercial jet aircraft.

However, the electrical system for aircraft at both ends of the complexity spectrum share many of the same basic components. All aircraft electrical systems have components with the ability to generate electricity.

Depending upon the aircraft, generators or alternators are used to produce electricity. Power from the generator may be used without modification or it may be routed through transformers , rectifiers or inverters to change the voltage or type of current. The generator output will normally be directed to one or more distribution Bus. Individual components are powered from the bus with circuit protection in the form of a Circuit Breaker or fuse incorporated into the wiring.

The generator output is also used to charge the aircraft battery s. Batteries are usually either of the lead-acid or NICAD types but lithium batteries are becoming more and more common.

They are used for both aircraft startup and as an emergency source of power in the event of a generation or distribution system failure. Some very simple single engine aircraft do not have an electrical system installed. The piston engine is equiped with a Magneto ignition system, which is self powering, and the fuel tank is situated so it will gravity feed the engine. The aircraft is started by means of a flywheel and crank arrangement or by "hand-proping" the engine.

If an electric starter, lights, electric flight instruments, navigation aids or radios are desired, an electrical system becomes a necessity. In most cases, the system will be DC powered using a single distribution bus, a single battery and a single engine driven generator or alternator. An ammeter, loadmeter or warning light will also be incorporated to provide an indication of charging system failure.

Electrical components will be wired to the bus-bar incorporating either circuit breakers or fuses for circuit protection. Provisions may be provided to allow an external power source such as an extra battery or a Ground Power Unit GPU to be connected to assist with the engine start or to provide power whilst the engine is not running.

More sophisticated electrical systems are usually multiple voltage systems using a combination of AC and DC buses to power various aircraft components. Secondary AC generation from an APU is usually provided for use on the ground when engines are not running and for airborne use in the event of component failure. Tertiary generation in the form of a hydraulic motor or a RAT may also be incorporated into the system to provide redundancy in the event of multiple failures.

Essential AC and DC components are wired to specific busses and special provisions are made to provide power to these busses under almost all failure situations. In the event that all AC power generation is lost, a static Inverter is included in the system so the Essential AC bus can be powered from the aircraft batteries. Robust system monitoring and failure warning provisions are incorporated into the electrical system and these are presented to the pilots when appropriate.

The manufacturer will also provide detailed electrical system isolation procedures to be utilized in the event of an electrical fire. In compliance with applicable regulations, components such as Standby Flight Instruments and Aircraft Emergency Floor Path Illumination have their own backup power supplies and will function even in the event of a complete electrical system failure.

Provisions are virtually always provided for connecting the aircraft electrical system to a fixed or mobile Ground Power Unit GPU.

Basic Definitions – Direct Current

Both AC and DC have their own characteristics and provide different advantages that can be used in different situations. As the name implies direct current, DC is a form of electricity that flows in one direction — it is direct and this gives it its name. The characteristic of direct current, DC can be shown on a graph. Here the current can be seen to be seen to be either positive or negative only.

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Direct current

Direct current DC is the unidirectional flow of an electric charge. An electrochemical cell is a prime example of DC power. Direct current may flow through a conductor such as a wire, but can also flow through semiconductors , insulators , or even through a vacuum as in electron or ion beams. The electric current flows in a constant direction, distinguishing it from alternating current AC. A term formerly used for this type of current was galvanic current. The abbreviations AC and DC are often used to mean simply alternating and direct , as when they modify current or voltage. Direct current may be converted from an alternating current supply by use of a rectifier , which contains electronic elements usually or electromechanical elements historically that allow current to flow only in one direction.

If you wish to contribute or participate in the discussions about articles you are invited to join SKYbrary as a registered user. An Aircraft Electrical System is a self contained network of components that generate, transmit, distribute, utilize and store electrical energy. An electrical system is an integratal and essential component of all but the most simplistic of aircraft designs. The electical system capacity and complexity varies tremendously between a light, piston powered, single engine GA aircraft and a modern, multiengine commercial jet aircraft.

Direct current DC is the unidirectional flow of electric charge.

A dynamo is an obsolete electrical generator that creates direct current using a commutator. Dynamos were the first electrical generators capable of delivering power for industry, and the foundation upon which many other later electric-power conversion devices were based, including the electric motor , the alternating-current alternator , and the rotary converter. Today, the simpler alternator dominates large scale power generation , for efficiency, reliability and cost reasons. A dynamo has the disadvantages of a mechanical commutator.

With simple, versatile content that separates it from other texts on electrical machines, this book is an ideal self-study tool for advanced students in electrical and other areas of engineering. In response to the often inadequate, rushed coverage of fundamentals in most basic circuit analysis books and courses, this resource is intelligently designed, easy to read, and packed with in-depth information on crucial concepts. The book starts by reviewing more basic concepts, with numerous examples to clarify their application. It then explores new "buzzword" topics and developments in the area of electrical machine applications and electric power systems, including:.

SEE VIDEO BY TOPIC: DC MOTORS AND GENERATORS

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The commercial efficiency is the ratio of the externally useful electrical power to the mechanical power used in driving the machine. In a 'series' dynamo the.

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  1. Kihn

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