![]() ![]() The homopolar motor is driven by the Lorentz force. A unipolar generator rated 1,125 kW, 7.5 V 150,000 A, 514 rpm built in 1934 was installed in a U.S. ![]() Lamme described in 1913 a homopolar machine rated 2,000 kW, 260 V, 7,700 A and 1,200 rpm with 16 slip rings operating at a peripheral velocity of 67 m/s. This strained his mentor relationship with Davy, due to his mentor's jealousy of Faraday's achievement, and is the reason for Faraday’s assignment to other activities, which consequently prevented his involvement in electromagnetic research for several years. In his excitement, Faraday published results. These experiments and inventions formed the foundation of modern electromagnetic technology. The wire would then rotate around the magnet if supplied with current from a chemical battery. One of these, now known as the homopolar motor, caused a continuous circular motion that was engendered by the circular magnetic force around a wire that extended into a pool of mercury wherein was placed a magnet. Faraday, having been challenged by Davy as a joke, went on to build two devices to produce what he called "electromagnetic rotation". In 1821, soon after the Danish physicist and chemist Hans Christian Ørsted discovered the phenomenon of electromagnetism, Humphry Davy and British scientist William Hyde Wollaston tried, but failed, to design an electric motor. Its operation was demonstrated by Michael Faraday in 1821 at the Royal Institution in London. The homopolar motor was the first electrical motor to be built. Working principle of a homopolar motor: due to movement of negative charges from center towards rim of the disk, a Lorentz force F L is created which brings the entire disk into rotation. ![]()
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