Abstract
In 1820 Oersted discovered the magnetic effect of an electric current, and the first primitive electric motor was built in the following year. Faraday’s discovery of electromagnetic induction in 1831 completed the foundations of electromagnetism, and the principles were vigorously exploited in the rapidly growing field of electrical engineering [1]. By 1890 the main types of rotating electrical machine had been invented, and the next forty years saw the development of many ingenious variations, along with refinement of the basic types. This was the golden age of machine development; electronics was in its infancy, and the rotating machine was king. Many machines are now obsolete which were once made in large numbers. Thus the cross-field DC machines, or rotary amplifiers, have been replaced by solid-state power amplifiers; while the Schrage motor and other ingenious variable-speed AC machines have given way to the thyristor-controlled DC motor and the inverter-fed induction motor.
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© 1991 J. D. Edwards
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Edwards, J.D. (1991). General Principles. In: Electrical Machines and Drives. Palgrave, London. https://doi.org/10.1007/978-1-349-21313-9_1
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DOI: https://doi.org/10.1007/978-1-349-21313-9_1
Publisher Name: Palgrave, London
Print ISBN: 978-0-333-53651-3
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