Introduction of motor AbstractMotor is a device that converts electrical energy into mechanical energy. It is through the coil (is the stator windings) generated rotating magnetic field and the role of forming a magnetic force rotating torque to the rotor (such as the mouse cage closed aluminum frame). Motor by using the power of DC motor and AC motor, motor power system mostly AC motor and can be synchronous motor or is asynchronous motor (motor stator magnetic field speed and rotor rotating speed does not maintain synchronous speed). The motor is mainly composed of stator and rotor, the direction of the force movement in the magnetic field is related to the direction of the current and the direction of the magnetic field (magnetic field). The working principle of the motor is the effect of the magnetic field on the current force, which makes the motor rotate. Key words: Motor ; power ; magnetic field ; currentBasic parameterProcess of inventionMotor using the pass electrical conductor in a magnetic field by the principle of force (this is different on the argument that the magnetic effect of electric current, the current teaching version of ninth grade physics clearly to separate the two), found that this principle is the Danish physicist, OE, 1777 August 14, was born in Lange Ron Arudejobbin a pharmacist family. Admitted to University of Copenhagen in 1799, received a doctorate in 1794. From 1801 to 1803 to Germany, France and other countries to visit, met many physicists and chemists. In 1806 he was appointed professor of physics at the University of Copenhagen, in 1815 he was appointed Permanent Secretary of the Royal Society of denmark. In 1820 due to current magnetic effect this extraordinary discovery by the British Royal Society Copley medal.Since 1829, he served as president of the Copenhagen Institute of technology. Died in Copenhagen in March 9, 1851. He has studied physics, chemistry and philosophy in many aspects. Owing to the influence of Kants philosophy and the natural philosophy of Xie Lin, it is believed that natural forces can be transformed into each other, and to explore the relationship between electricity and magnetism in the long term. 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 caused 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 - a new field of physics.In 1812, he first proposed the idea of the connection between light and electromagnetism. In 1822, he studied the compressibility of liquids and gases. 1825 refined aluminum, but the purity is not high. In the study of acoustics, he tried to find out the electric phenomenon caused by sound. His last research work was magnetic. He is an enthusiastic attention to scientific research and experiment of the teacher, he said: I dont like the way that no experimental boring lectures, all scientific research from the beginning of the experiment of. So popular with students. He was also an excellent speaker and natural science popularization worker, in 1824, the establishment of 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.In 1821, Faraday completed the first major electric invention. In the past two years before, OE have been found if current passes through the circuit, it in the vicinity of the ordinary compass needle will shift. Faraday was inspired by the thought that if the magnet is fixed, the coil may be moving. According to this idea, he succeeded in inventing a simple device. In the device, as long as there is current through the line, the line will turn around a magnet. In fact Faraday invented the first electric motor, which was the first device to use electric current to move the body. Although the device is simple, but it is today in the world to use the ancestors of all motors.This is a major breakthrough. But its practical use is very limited, because at that time there is no other way to generate electricity in addition to the simple battery.Development present situationChinas motor production began in 1917, the industry has formed a relatively complete industrial system in the country. With the development of electric power industry, the electric motor manufacturing industry in our country has shown great vitality, and the scale of production and marketing and the economic effici