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An industrial type of AC motor with electrical terminal box at the top and output rotating shaft on the left. Such motors are widely used for pumps, blowers, conveyors and other industrial machinery. The rotor magnetic field may be produced by permanent magnets, reluctance saliency, or DC or AC electrical windings. The two main types of AC motors are induction motors and synchronous motors. The synchronous motor produces its rated torque at exactly synchronous speed. AC and DC mechanically commutated machines in which speed is dependent on voltage and winding connection. Faraday is usually given credit for this discovery since he published his findings first.
It consisted of a revolving horseshoe magnet passing over two wound wire coils. United States and Europe during the late 19th century trying to develop workable AC motors. June 28, 1879, to the Physical Society of London. 1880 that identified the rotating magnetic field principle and that of a two-phase AC system of currents to produce it.