The role of the motor, the motor is

The role of the motor, the motor is implemented based on electromagnetic induction and converting the mechanical energy conversion between mechanical energy and electrical energy, comprising a rotary motor and a transformer into two categories. The rotary electric machine is an electromechanical energy conversion device, it is mainly used as a generator, the mechanical energy into electrical energy; or as a motor, the electrical energy into mechanical energy. Some motor is also used as condensers for improving the power factor of the grid. Thus, there are micro-motor, widely used in automatic control systems. Electrical power conversion means is a transformer is no relative motion between the components, it is widely used in conversion and power transmission circuit isolation, voltage, current, impedance. The main role in the performance of the motor, transmission and distribution of electric energy; driving various machinery and equipment; various control systems as an important and original automated, intelligent device three aspects. A brief history of the development of the motor. October 1831, Faraday created the first model of the induction generator. Since then, the research and application of electricity developed rapidly, electricity as a new powerful energy-hui began to increasingly significant role in the production of human life. The initial stage of the generator is a permanent magnet generator, which uses a permanent magnet as a field magnet. Since the magnetic field strength of the permanent magnet itself is limited so powerful permanent magnetic generator can not provide power, lack of practicality. In 1845 the British physicist Wheatstone use external power to the coil excitation to the electromagnet instead of the permanent magnet, and achieved great success. Subsequently improved armature winding, thereby producing a first magnet generator. 1866 German scientists made the first use of Siemens electromagnet self-excited generator. Siemens generator epoch-making significance in the history of electrical development. 1870 Valley Belgian Gram rely proposed theory, and using tooth structure of the armature 1865 Italian Paqi Naughtie invention, creating a closed annular slotless armature winding, an annular armature made of self DC generator. In 1873, the German electrical engineer Hefner Duarte Zernike DC generator armature has made improvements, the successful development of the drum-shaped armature self-excited DC generator. By absorbing and advantages of the generator rotor Paqi Naughtie Gramm, the manufacturing method is simplified, thereby greatly improving the efficiency of the generator, reducing the production cost of the generator, the generator into a practical stage.Motor development work is also under way, in 1836 the American engineer Davenport first attempt to try motor drive machinery. In 1834 Russian physicist Jacobi invented a rod-like core of a motor power of 15W. Generator and the motor is a machine with two kinds of different functions, which is used as an output means is a current generator, which is used as a power supply unit is an electric motor. The nature of the two is reversible accidentally discovered in 1873. Classification of the motor is varied, by application into function generators, motors; power to the electric power converter is divided into another form: transformers, variable flow machine, variable frequency drive, shift camera; play adjusting electromechanical systems, amplification, motor control function - control the motor; press speed motor can be divided into: a transformer, DC motor, induction motor, synchronous motor, a commutator AC motor; power level divided by large motors, small motor, micro-motor . With the development of power electronics and electrical materials, there are some other special motors progressive motor, switched reluctance motor, an ultrasonic motor, which motor is often called special motor.