电机的作用，电机是以电磁感应现象为基础实现机械能与电能之间的转换以及变

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. <br>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. <br>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.<br>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. <br>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.

The role of motor, the motor is based on the electromagnetic induction phenomenon to achieve the conversion of mechanical energy and electrical energy and change electrical energy machinery, including rotary motor and transformer two categories. A rotary motor is an electromechanical energy conversion device that is mainly used as a generator to convert mechanical energy into electrical energy, or as an electric motor, to convert electrical energy into mechanical energy. Some motors are also used as tuning cameras to improve the power factor of the grid. Therefore, there are micro-motors, widely used in automatic control systems. Transformers are power transformation devices without relative motion between components, which are widely used in power transmission, voltage, current, impedance transformation and circuit isolation.<br>The main function of motor is in the production, transmission and distribution of electric energy, driving various production machinery and equipment, and being an important original of various control systems and automatic and intelligent devices.<br>A brief history of the development of motors. In October 1831, Faraday created a model of the first induction generator. Since then, the research and application of electricity has developed rapidly, and electricity as a new and powerful energy source has begun to play an increasingly great role in human production and life. The generator in the initial stage is a permanent magnet generator, i.e. a permanent magnet is used as a field magnet. Due to the limited magnetic field strength of the permanent magnet itself, the permanent magnet generator cannot provide powerful power and lacks practicality. In 1845, British physicist Wheatstone used an additional power supply to give the coil excitation, with electromagnets instead of permanent magnets, with great success. The armature winding was then improved to produce the first electromagnet generator. In 1866, German scientist Siemens made the first self-exciting generator using electromagnets. Siemens generators are of epoch-making significance in the history of electrical development. In 1870 the Belgian Gramlean relied on the theory put forward by Wally and, using the toothed armature structure invented by the Italian Pacinotti in 1865, created a ring-shaped, grooveless closed armature winding, and made a ring armature self-exciting DC generator. In 1873, the German electrical engineer Hefner Arteneck made improvements to the armature of the DC generator, and developed a drum-shaped armature self-exciting DC generator. Drawing on the advantages of Gram and Pacinotti's generator rotors, he simplified the manufacturing method, thus greatly improving the efficiency of the generator, reducing the cost of production of the generator, and bringing the generator into a practical phase.<br>The development of electric motors is also under way, in 1836, the American engineer Davenport first tried to test the motor drive machinery. In 1834, Russian physicist Jacoby invented a rod-shaped iron-core motor with a power of 15W. The generator and the electric motor are two different functions of the same machine, which is the generator as the current output device, and the electric motor is used as the power supply device. The essence of both is reversible by chance discovery in 1873.<br>The classification of motor is varied, according to the application function is divided into generators, electric motors, the electrical power conversion of another form of electrical power is divided into: transformers, converters, inverters, mobile cameras, in the mechanical and electrical system to play a role in regulation, amplification, control of the motor -control motor, according to the operating speed of the motor can also be divided into: transformers, DC motors, Asynchronous motor, synchronous motor, AC commutator motor, according to the power size is divided into large motor, small and medium-sized motor, micro motor. With the development of electric electronic technology and electrical materials, there are other special motor progressive motors, switching magneto-resistive motors, ultrasonic motors, etc. , these motors are often referred to as special motors.

The function of motor is to realize the conversion between mechanical energy and electrical energy based on the electromagnetic induction phenomenon, as well as the transformation of electrical energy, including rotating motor and transformer. Rotating motor is a mechanical and electrical energy conversion device, which is mainly used as a generator to convert mechanical energy into electrical energy, or as a motor to convert electrical energy into mechanical energy. Some motors are also used as condenser to improve the power factor of power grid. Therefore, there are micro and special motors, which are widely used in automatic control system. Transformer is a kind of power transformation device without relative motion among components, which is widely used in power transmission, voltage, current, impedance transformation and circuit isolation.<br>The main functions of electric motor are as follows: production, transmission and distribution of electric energy; driving various production machinery and equipment; as an important component of various control systems and automatic and intelligent devices.<br>Brief history of motor development. In October 1831, Faraday created the model of the first induction generator. Since then, the research and application of electricity have developed rapidly. As a new and powerful energy, electricity has played an increasingly important role in human production and life. In the initial stage, the generator is a permanent magnet generator, that is, the permanent magnet is used as the field magnet. Due to the limited magnetic field strength of permanent magnet itself, permanent magnet generator can not provide strong power and lack of practicability. In 1845, British physicist Wheatstone used an external power source to excite the coil, and replaced the permanent magnet with an electromagnet, which was a great success. Later, the armature winding was improved, and the first electromagnet generator was made. In 1866, German scientist Siemens made the first self-excited generator using electromagnet. Siemens generator has epoch-making significance in the history of electrical development. In 1870, Belgian personality ram relied on the theory put forward by Wally, and adopted the toothed armature structure invented by Italian pachinotti in 1865, created the ring-shaped non slot closed armature winding, and made the ring-shaped armature self-excited DC generator. In 1873, German Electrical Engineer Hefner altenek improved the armature of DC generator, and developed the drum armature self-excited DC generator. He absorbed the advantages of the generator rotors of gram and pachinotti, simplified the manufacturing method, greatly improved the efficiency of the generator, reduced the production cost of the generator, and made the generator enter the practical stage.<br>In 1836, Davenport, an American engineer, first tried to use electric motor to drive machinery. In 1834, the Russian physicist Jacobi invented a rod-shaped iron core motor with a power of 15W. Generator and motor are two different functions of the same machine. Using them as current output device is generator, and using them as power supply device is motor. The nature of the two was discovered by accident in 1873.<br>There are various types of motors, which are divided into generators and motors according to their application functions; another form of electric power conversion is divided into transformers, convertors, frequency converters and cameras; motors that play the role of regulation, amplification and control in the electromechanical system - control motors; motors can also be divided into transformers, DC motors, asynchronous motors and synchronous motors according to their running speed Motor, AC commutator motor; according to the power, it can be divided into large motor, medium and small motor, and micro motor. With the development of power electronic technology and electrical materials, there are some other special motors, such as progressive motor, switched reluctance motor, ultrasonic motor, etc. these motors are usually called special motors.<br>