The motor uses the magnetic effect principle of the current, invented the principle of Danish physicist Oster. A pharmacist family oersted was born in August 14, 1777 Lengrand Ruud Joe bin island. 1794 was admitted to the University of Copenhagen, received his Ph.D. in 1799. 1801 to 1803 to Germany, France and other countries visited, met many physicists and chemists. 1806 since the University of Copenhagen professor of physics, since 1815, the Danish Royal Society executive secretary. 1820 due to the current magnetic effect of this outstanding discovery by the Royal Society Copley medal. In 1829 he was appointed dean of Copenhagen Institute of technology. He died in Copenhagen in March 9, 1851. He had on physics, chemical and philosophical studies have been done in many aspects. Due to the influence of Kant's philosophy and Schelling's natural philosophy, we firmly believe that the natural force can be transformed into each other, exploring the connection between electricity and magnetism for a long time. April 1820 finally found the current of the magnetic needle, namely current magnetic effect. In July 21st of the same year with the theme of "the effect of electric needle on the conflict" published his findings. This short paper made a great shock to the European physics community, which led to the emergence of a large number of experimental results, which opened up a new field of Physics - electromagnetics. He is a teacher ebullience importance to scientific research and experiment, he said: "I do not love that no experimental boring lectures, scientific research is all from the beginning of the experiment". So welcome by students. He is also a prominent lecturer and natural science popularization workers, in 1824 initiative to set up the Danish Association for the promotion of science, created the first Danish physics laboratory. In 1908 the establishment of the association "oersted Medal" to promote the Danish Natural Sciences, in recognition of the significant contribution of physicists. Named 1934 unit of magnetic field in the CGS unit to "OE". 1937 American Association of physics teachers set up a "oersted Medal", physics teacher reward to make a contribution in physics teaching.