Charles Schenk Bradley
Charles Schenk Bradley (born April 12, 1853 in Victor (New York) , New York , † 1929 ) was an American electrical engineer , inventor and pioneer of early electric motors . Alongside Galileo Ferraris , Michail Ossipowitsch Doliwo-Dobrowolski and Friedrich August Haselwander, he is one of the founders of the three-phase alternating current used today in the field of electrical power engineering , also known colloquially as three-phase current.
Around 1880 he worked for Thomas Alva Edison for three years before establishing his own electrical engineering laboratory in New York in 1883. Among other things, he experimented with multi-phase alternating current for electric motors, where he expanded the armature of two direct current machines with three slip rings and built the first simple three-phase systems before Galileo Ferrari . However, he did not sufficiently recognize the importance of his work, had it patented, but did not implement his ideas adequately in the practical structures. In 1887 patented a two-phase alternating current power transmission system with four conductors. In 1888, a system was patented with three alternating currents which are each phase shifted by 120 °, similar to the three-phase system commonly used today.
Bradley was a member of the American Institute of Electrical Engineers . He was married to Emma Orcutt and had four children.
literature
- Mitchell Charles Harrison: Prominent and Progressive Americans. An encyclopædia of contemporaneous biography . New York Tribune, 1870 ( online ).
Individual evidence
- ^ The Electrotechnical Institute of the Grand Ducal Technical University of Karlsruhe: The invention of the electric motor 1856-1893
- ^ Gerhard Neidhöfer: Early Three-Phase Power ( Memento of December 11, 2012 in the Internet Archive ) , 2007, IEEE Power Engineering Society
| personal data | |
|---|---|
| SURNAME | Bradley, Charles Schenk |
| BRIEF DESCRIPTION | Electrical engineer and inventor, inventor of multiphase motors |
| DATE OF BIRTH | April 12, 1853 |
| PLACE OF BIRTH | Victor (New York) |
| DATE OF DEATH | 1929 |