What is Electric Motor ?

powering propellant to high speed, with some systems being based on electrodynamic tethers principles of propulsion to the magnetosphere.[105]

Ganot provides a superb illustration of one such early electric motor designed by Froment.[24]

The term 'electronic commutator motor' (ECM) is identified with the heating, ventilation and air-conditioning (HVAC) industry, the distinction between BLDC and BLAC being in

This article is about electromagnetic power generation. For electrostatic generators like the Van de Graaff machine, see Electrostatic generator.

In electricity generation, a generator[1] is a device that converts motive power (mechanical energy) into electrical

power for use in an external circuit. Sources of mechanical energy include steam turbines, gas turbines, water

turbines, internal combustion engines and even hand cranks. The first electromagnetic generator, the Faraday

disk, was invented in 1831 by British scientist Michael Faraday. Generators provide nearly all of the power for

electric power grids.

The reverse conversion of electrical energy into mechanical energy is done by an electric motor, and motors and

generators have many similarities. Many motors can be mechanically driven to generate electricity and frequently

make acceptable manual generators.

Electromagnetic generators fall into one of two broad categories, dynamos and alternators

Dynamos generate pulsing direct current through the use of a commutator

Alternators generate alternating current

Mechanically a generator consists of a rotating part and a stationary part

Rotor: The rotating part of an electrical machine

Stator: The stationary part of an electrical machine, which surrounds the rotor

One of these parts generates a magnetic field, the other has a wire winding in which the changing field induces an electric

current

Field winding or field magnets (PMs): The magnetic field producing component of an electrical machine. The magnetic field

of the dynamo or alternator can be provided by either wire windings called field coils or permanent magnets. Electrically

excited generators includes an excitation system to control the field winding flux. A generator using permanent magnets (PMs) is sometimes called a magneto, or

permanent magnet synchronous generators (PMSMs).

Armature: The power-producing component of an electrical machine. In a generator, alternator, or dynamo the armature windings generate the electric current