An electric motor uses electrical energy to produce mechanical energy, usually through the interaction of magnetic fields and current-carrying conductors. The reverse process, producing electrical energy from mechanical energy, is accomplished by a generator or dynamo.
Traction motors used on vehicles often perform both tasks.
Electric motors can be run as generators and vice versa, although this is not always practical.
Electric motors are ubiquitous, being found in applications as diverse as industrial fans, blowers and pumps, machine tools, household appliances, power tools, and disk drives.
They may be powered by direct current (for example a battery powered portable device or motor vehicle), or by alternating current from a central electrical distribution grid.The smallest motors may be found in electric wristwatches.Medium-size motors of highly standardized dimensions and characteristics provide convenient mechanical power for industrial uses.The very largest electric motors are used for propulsion of large ships, and for such purposes as pipeline compressors, with ratings in the thousands of kilowatts.
Electric motors may be classified by the source of electric power, by their internal construction, and by their application.Źródło: https://en.wikipedia.org/wiki/Engine#Electric_motor
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