Converting electric energy into mechanical energy -- the invention of electric motor
Development history of electric motor
In 1834, Jacobi in Russia made the first practical electric motor. American inventor Tesla made an induction motor in 1883.
In 1889, dolivo dobrovolsky of Russia made a practical three-phase induction motor.
Principle of induction motor: three-phase alternating current can produce rotating magnetic field in space, which will make the closed aluminum frame in it rotate.
Important energy - electric energy
1. Electric energy can be used as the conversion center of other forms of energy.
2. The application of electric energy is mainly reflected in three aspects: energy conversion and transmission, electric lighting and electric communication.
The degree of electrification has become an important symbol to measure the development level of social material civilization.
The concept of field is the most important change in physics concept and basic theory since Newton's time.
The development of Maxwell: a great monument
There are two pillars of Maxwell's electromagnetic field theory:
1. The changing magnetic field produces an electric field.
2. The changing electric field produces a magnetic field.
