Asynchronous motor works as follows: When the conductor in the magnetic field cutting magnetic lines, the induction current in the conductor, "induction motor" the name of the resulting.
The combined effect of induced current and magnetic field imparts a driving force to the motor rotor. Three sets of windings ask each other a difference of 120 degrees, each set of windings by the three-phase AC power supply in one phase.
The motor uses the current magnetic effect principle, invented this principle is the Danish physicist Oster
Motor Development In 1831, the American physicist Henry designed the first electronic motor. Inspired by Henry, a man named William Richie designed and built a rotating electric motor. The Ridge motor is similar to the DC motor model we assembled in the lab today.
By the 1840s, the Russian scientist Jacopo made the electric motor more practical. He used electromagnets instead of permanent magnets to work. The new electric motor was mounted on a yacht at the time, carrying several passengers over the Neva River. This caused a great sensation. Since then, the American-born Tesla, born in Croatia, built the first induction motor in 1888, and he was among the most widely used in various motors. Induction motors rapidly input AC power into a set of outer coils called "stators," which in turn generate a rotating magnetic field. A set of coils in the shaft is called a "rotor". It is induced by the rotating magnetic field of the stator. The rotor then changes into an electromagnet due to the current change.
American physicist Henry Faraday made the great discovery of electromagnetic induction at the same time. In August 1830, Henry had observed the phenomenon of electromagnetic induction in his experiment, which is about one year earlier than Faraday's discovery of electromagnetic induction. But at the time, Henry was concentrating on making a bigger electromagnet, failing to publish the experimental result in time and not filing a patent in time and losing the right to invention. However, Henry never considered individual fame and fortune, he believes that knowledge should be shared by humans all over the world, never fight with Faraday found the right to devote themselves wholeheartedly to science. Henry's noble character was praised by the world. So in the end, people still attributed the discovery of electromagnetic induction to Faraday. Particularly worth mentioning is that the Henry experimental device is closer to the modern general-purpose transformer than the Faraday induction coil.
Single-phase AC motor rotation principle Single-phase AC motor has only one winding, the rotor is a squirrel-cage.
Single phase can not generate rotating magnetic field.To make single-phase motor can be automatically rotated, we can add a starter winding in the stator, starting winding and the main winding in the space difference of 90 degrees, the starting winding to be connected in series with a suitable capacitor , So that the current with the main winding phase difference in approximately 90 degrees, the so-called phase separation principle. Two such currents, 90 degrees out of phase, pass into two windings that are spatially separated by 90 degrees and will generate a spatially (two-phase) rotating field that will automatically start with this rotating field.