Mechanical power transmission methods and differences pdf
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Power transmission is the movement of energy from its place of generation to a location where it is applied to perform useful work. Power is defined formally as units of energy per unit time. In SI units:. Since the development of technology , transmission and storage systems have been of immense interest to technologists and technology users. With the widespread establishment of electrical grids , power transmission is usually associated most with electric power transmission.
Alternating current is normally preferred as its voltage may be easily stepped up by a transformer in order to minimize resistive loss in the conductors used to transmit power over great distances; another set of transformers is required to step it back down to safer or more usable voltage levels at destination.
Power transmission is usually performed with overhead lines as this is the most economical way to do so. Underground transmission by high-voltage cables is chosen in crowded urban areas and in high-voltage direct-current HVDC submarine connections.
Power might also be transmitted by changing electromagnetic fields or by radio waves ; microwave energy may be carried efficiently over short distances by a waveguide or in free space via wireless power transfer. Electrical power transmission has replaced mechanical power transmission in all but the very shortest distances. From the 16th century through the industrial revolution to the end of the 19th century, mechanical power transmission was the norm.
Mechanical power may be transmitted directly using a solid structure such as a driveshaft ; transmission gears can adjust the amount of torque or force vs. Factories were fitted with overhead line shafts providing rotary power.
Short line-shaft systems were described by Agricola , connecting a waterwheel to numerous ore-processing machines. One mid 19th century factory had 1, feet of line shafting with pulleys. Hydraulic systems use liquid under pressure to transmit power; canals and hydroelectric power generation facilities harness natural water power to lift ships or generate electricity. Pumping water or pushing mass uphill with windmill pumps is one possible means of energy storage.
London had a hydraulic network powered by five pumping stations operated by the London Hydraulic Power Company , with a total effect of 5 MW. Pneumatic systems use gasses under pressure to transmit power; compressed air is commonly used to operate pneumatic tools in factories and repair garages.
A pneumatic wrench for instance is used to remove and install automotive tires far more quickly than could be done with standard manual hand tools. A pneumatic system was proposed by proponents of Edison's direct current as the basis of the power grid. Compressed air generated at Niagara Falls would drive far away generators of DC power. The war of the currents ended with alternating current AC as the only means of long distance power transmission. Thermal power can be transported in pipelines containing a high heat capacity fluid such as oil or water as used in district heating systems, or by physically transporting material items, such as bottle cars, or in the ice trade.
While not technically power transmission, energy is commonly transported by shipping chemical or nuclear fuels. Possible artificial fuels include radioactive isotopes , wood alcohol , grain alcohol , methane , synthetic gas , hydrogen gas H 2 , cryogenic gas , and liquefied natural gas LNG.
From Wikipedia, the free encyclopedia. Main article: Electric power transmission. Further information: high-voltage cable. Main article: transmission mechanics. See "book 8 figure 22". Archived from the original on Categories : Electric power transmission. Namespaces Article Talk. Views Read Edit View history. Help Learn to edit Community portal Recent changes Upload file.
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Couplings for mechanical power transmission . . .
Romina Ronquillo. Gears are toothed, mechanical transmission elements used to transfer motion and power between machine components, and in this article, we discuss the different types of gears available and how gears work. Operating in mated pairs, gears mesh their teeth with the teeth of another corresponding gear or toothed component which prevents slippage during the transmission process. Each gear or toothed component is attached to a machine shaft or base component, therefore when the driving gear i. Depending on the design and construction of the gear pair, the transference of motion between the driving shaft and the driven shaft can result in a change of the direction of rotation or movement. Additionally, if the gears are not of equal sizes, the machine or system experiences a mechanical advantage which allows for a change in the output speed and torque i.
If you need a mechanical power transmission coupling, the device used to connect facing ends of two shafts together to transmit mechanical power from the driver to the driven, there are two main options. Rigid couplings are used in applications where the two shafts are more precisely aligned, but flexible couplings allow for issues such as angular, axial and parallel misalignment which are more common in many industrial applications. High quality mechanical and fluid power products are always available straight from our comprehensively stocked warehouse, but, we are more than that! If you need more, be it the smallest drive component through to complex drive line component packages, then speak to our experienced sales team who will provide a solution based upon your application requirements. Quick delivery times even for bespoke mechanical power transmission couplings due to good stocks and the comprehensive in-house machining facilities. Couplings for mechanical power transmission. Large stocks of mechanical power transmission couplings for quick delivery and in-house machine shop for exact fit to your application machinery.
Power transmission is the movement of energy from its place of generation to a location where it is applied to perform useful work. Power is defined formally as units of energy per unit time. In SI units:. Since the development of technology , transmission and storage systems have been of immense interest to technologists and technology users. With the widespread establishment of electrical grids , power transmission is usually associated most with electric power transmission. Alternating current is normally preferred as its voltage may be easily stepped up by a transformer in order to minimize resistive loss in the conductors used to transmit power over great distances; another set of transformers is required to step it back down to safer or more usable voltage levels at destination. Power transmission is usually performed with overhead lines as this is the most economical way to do so.
A transmission is a machine in a power transmission system, which provides controlled application of power. Often the term 5-speed transmission refers simply to the gearbox , that uses gears and gear trains to provide speed and torque conversions from a rotating power source to another device. In British English , the term transmission refers to the whole drivetrain , including clutch , gearbox, prop shaft for rear-wheel drive vehicles , differential , and final drive shafts. In American English, however, the term refers more specifically to the gearbox alone, and detailed usage differs. The most common use is in motor vehicles , where the transmission adapts the output of the internal combustion engine to the drive wheels.
Machines or machine parts can move through the drive , also called transporters or transmissions. One of the most common examples would be a car where the wheels are propelled by the engine. Several drive systems exist:. In this guide we will delve into the mechanical drives. This guide is meant to inform you on how these drives work, which mechanical drives exist and the different parts that belong to these drives.