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Copper in energy-efficient motors
Motors and motor-driven systems account for 43%-46% of all global electricity consumption and 69% of all electricity used by industry.〔Energy‐efficiency policy opportunities for electric motor‐driven systems, International Energy Agency, 2011 Working Paper in the Energy Efficiency Series, by Paul Waide and Conrad U. Brunner, OECD/IEA 2011)〕 Inefficient electric motors waste electrical energy and therefore cost more to operate. Since most electricity is generated from fossil-fueled power plants, motors and motor-driven systems are also indirect contributors to greenhouse gas emissions produced by these plants. Hence, there are compelling economic and environmental reasons to increase the use of energy efficient motors.
As the second highest rated electrical conductor after silver, the use of copper conductors can help improve the electrical energy efficiencies of motors. There are electrical energy efficiency advantages of using copper in the stator and rotor of motors. AC induction motors using copper conductors are frequently specified to power industrial machinery. A new development in motors is a copper die-cast rotor technology that was developed specifically for premium efficiency motors.
==Electric motors transform electrical energy into mechanical energy==
An electric motor is an electromechanical device that uses magnetic attraction and repulsion to produce controlled rotational motion. In an electric motor, electrical energy delivered by a power source is converted into mechanical energy. This is accomplished when one set of electromagnets mounted on a fixed assembly (or stator) attract the opposite polarity of electromagnets on a rotating assembly (or rotor). The magnetic field produced by the stator rotates in space by the application of an electric current, thereby causing the rotor to rotate with it. In turn, the rotor drives mechanical loads coupled with it.
By transforming electrical energy into mechanical energy, electric motors are able to power a wide range of machinery and consumer products.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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