نتایج جستجو برای: electric motors

تعداد نتایج: 155075  

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2002
James H Marden Lee R Allen

Animal- and human-made motors vary widely in size and shape, are constructed of vastly different materials, use different mechanisms, and produce an enormous range of mass-specific power. Despite these differences, there is remarkable consistency in the maximum net force produced by broad classes of animal- and human-made motors. Motors that use force production to accomplish steady translation...

2013
Vasanthi V Ashok

Wavelet Transform is a mathematical tool for time frequency analysis of non stationary signals like the current waveform in electric traction system. The locomotives used in traction system have different types of traction motors –dc and three phase ac motors with different methods of speed control. Hence technologies will be different depending on the type of locomotives. The nature of the loa...

2010
Tsuneo Kume

16 Management Summary One of the driving forces behind the industrial revolution was the invention—more than a century ago—of the electric motor. Its widespread use for all kinds of mechanical motion has made life simpler and has ultimately aided the advancement of humankind. And the advent of the inverter that facilitated speed and torque control of AC motors has propelled the use of electric ...

2011
Miguel Delgado Prieto Jordi Cusidó Jose Luis Romeral Martínez

Electric motors are nowadays widely used in all kind of industrial applications due to their robustness and ease of control through inverters. Therefore, any effort, with the aim of improving condition monitoring techniques applied to them, will result in a reduction of overall production costs by means of productive lines stoppage reduction, and increment of the industrial efficiency. In this ...

Journal: :Journal of the Franklin Institute 1913

Journal: :Transactions of the American Institute of Electrical Engineers 1902

Journal: :ACS nano 2010
Johannes S Seldenthuis Ferry Prins Joseph M Thijssen Herre S J van der Zant

Many types of molecular motors have been proposed and synthesized in recent years, displaying different kinds of motion, and fueled by different driving forces such as light, heat, or chemical reactions. We propose a new type of molecular motor based on electric field actuation and electric current detection of the rotational motion of a molecular dipole embedded in a three-terminal single-mole...

2014
Malek Njah Mohamed Jallouli Razali Tomari

The electric wheelchair for handicapped is used to improve the displacement of disabled persons. An automatic navigation system is needed to ensure greater autonomy and security for the disabled person. Automatic control system is added to a manual control for autonomous displacement. Initial system composed of two DC motors installed at the rear of used electric wheelchair, power module for th...

Journal: :international journal of smart electrical engineering 2015
sadegh hesari mohammad bagher naghibi sistani mostafa jalalian ebrahimi

in most industrial zones, electric energy is one of the most important energy sources. since electrical motors are the main energy consumers of industrial factories, consumption optimization in these motors can be considered as a main option related to energy saving. one very effective way to reduce the consumption of these equipment is to use a motor speed controllers or drives. since the loss...

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