Ernst Werner von Siemens (1816 65438+February13-1892 65438+February 6), a world-famous German inventor, entrepreneur, physicist and electrical engineer, laid down and laid down. 1866, Siemens put forward the working principle of the generator, and an engineer from Siemens completed the first self-excited DC generator. In the same year, Siemens also invented the first DC motor. These technologies developed by Siemens are often put into the market immediately or applied to new products. For example, elevators (1880), electric locomotives (1879), trams (188 1) and trolleybuses (1882) were all first put into the market by Siemens. Ironically, the electric car, which was not developed until the end of the 20th century, was first invented by Siemens in 1898.