An electric motor is an electromechanical device that converts electrical energy into mechanical energy.
Most electric motors operate through the interaction of magnetic fields and current-carrying conductors to generate force. The reverse process, producing electrical energy from mechanical energy, is done by generators such as an alternator or a dynamo; some electric motors can also be used as generators, for example, a traction motor on a vehicle may perform both tasks. Electric motors and generators are commonly referred to as electric machines.
Electric motors are 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, e.g., a battery powered portable device or motor vehicle, or by alternating current from a central electrical distribution grid or inverter. Small 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 ships, pipeline compressors, and water pumps with ratings in the millions of watts. Electric motors may be classified by the source of electric power, by their internal construction, by their application, or by the type of motion they give.
The physical principle behind production of mechanical force by the interactions of an electric current and a magnetic field, Ampère's force law, was discovered by André-Marie Ampère in 1820. Electric motors of increasing efficiency were constructed from 1821 through the end of the 19th century, but commercial exploitation of electric motors on a large scale required efficient electrical generators and electrical distribution networks. The first commercially successful motors were made around 1873 by Zénobe Gramme.
Some devices convert electricity into motion but do not generate usable mechanical power as a primary objective, and so are not generally referred to as electric motors. For example, magnetic solenoids and loudspeakers are usually described as actuators and transducers, respectively, instead of motors. Some electric motors are used to produce torque or force.
Other articles related to "electric, electric motor, motor":
... scientists involved with the Henney Kilowatt, the first transistor-based electric car) ... prototype hybrid drivetrain (with a 16 kilowatts (21 hp) electric motor) into a 1972 Buick Skylark provided by GM for the 1970 Federal Clean Car Incentive Program ... voltage controller to link the batteries, motor (a jet-engine starter motor), and DC generator was Arthurs' ...
... Turbo unit used in the BMW 750i (where it delivers 300 kW/407 hp) with an electric motor that is only designed to provide support to the internal combustion ... The electric motor is integrated between transmission and engine and provides 15 kW of power and 210 Nm of torque ... In this so-called mild hybrid configuration, the electric motor increases the potential of the eight-cylinder petrol engine while using Brake Energy Regeneration – mostly in urban traffic ...
... For 1998, Panoz reached an agreement with English firm Zytek to develop a hybrid electric motor for the Esperante GTR-1 ... The idea was that the car would be able to gain better fuel mileage by using an electric motor that would help drive the rear wheels during acceleration, thus requiring less power from the gasoline ... of course require a set of batteries to power the electric motor ...
Famous quotes containing the words motor and/or electric:
“We disparage reason.
But all the time its what were most concerned with.
Theres will as motor and theres will as brakes.
Reason is, I suppose, the steering gear.”
—Robert Frost (18741963)
“Flabby, bald, lobotomized,
he drifted in a sheepish calm,
where no agonizing reappraisal
jarred his concentration of the electric chair
hanging like an oasis in his air
of lost connections. . . .”
—Robert Lowell (19171977)