Electric motor, Electric motor), also known as motor or motor, is a kind of electrical energy into mechanical energy, mechanical energy and can be used to produce kinetic energy, electrical equipment used to drive other devices. The various types of motor, but can be roughly divided into ac motor and dc motor to be used for different occasions To compare DC Motor (DC Motor) in the speed for the benefits of relatively simple, only control the size of the voltage has control of speed, but this kind of Motor is unfavorable in operating conditions such as high temperature, flammable, and due to the need to carbon brush Motor (am) as current converter components (brush Motor), so need to regular cleaning brush friction generated by dirt. lamination motor No carbon brush motor is called the brushless motor, relative to the brush, brushless motor because of less carbon brush and shaft friction so more save electricity and quieter. Production difficulty is higher, the price also is higher. AC Motor (AC Motor), on the other hand, works under high temperature, flammable, and need not regular cleaning of carbon brush dirt, but in the speed is more difficult, because the control of AC Motor speed to control the frequency of the alternating current (or the use of induction motors, with increased internal resistance decreased under the same the frequency of the alternating current Motor speed), the control of the voltage will only affect the torque of the Motor. General civil motor voltage of 110 v and 220 v two kinds, such as in industrial applications and 380 v or 440 v type. The development history In 1835, produced the world's first motor can drive the application of small trolley for us a Smith of Wen Bo (Thomas Davenport). In the early 1870 s, the world's earliest available commercial motor by the Belgian electrical engineer Zenobe Theophile Gamme invention. In 1888, a famous motor part American inventor nikola tesla used Faraday electromagnetic induction principle, invention of ac motor, is the induction motor. In 1845, the British physicist huis (Wheatstone) to apply for the patent of the linear motor, but the principle in the 1960 s were seriously, and design the practicability of the linear motor, the current has been widely applied in industry. In 1902, the Swedish engineer Dan nelson use tesla induction motor rotating magnetic field of the concept, invented the synchronous motor. In 1923, the Scot James Weir French invented type three-phase Variable reluctance (Variable reluctance) stepper motor. In 1962, through the help of hall element, a practical DC brushless motor finally. In the 1980 s, the utility of ultrasound motor starts. The principle of The basis of the rotation of the motor principle for Buddha to Ming left hand rule, when a conductor is placed in a magnetic field, if the conductor is applying a current, wire will cut magnetic lines to make wires produce movement. Current into the coil magnetic field, using magnetic effect of current, make the electromagnet in fixed magnet rotating device in a row, can convert electrical energy into mechanical energy. With a permanent magnet or produced by another group of coil magnetic field interact to produce power Is the principle of dc motor stator, the rotor in accordance with the interaction force generated by the direction of the movement. Ac motor stator winding coil is on alternating current (ac), to produce a rotating magnetic field, rotor rotating magnetic field to attract together to make the basic construction of dc motor including rotary motion "armature", "field magnet", "the collector ring", "brush". Armature: can around the axis of rotation of the soft iron core coil. Field magnet: produce the magnetic field strength permanent magnet or electromagnet. Collector ring: coil two ends to about two semicircle collector ring, with the coil rotation, to change the direction of the current device. Each roll (180 degrees), half a circle on the coil current direction will change again. Brush, usually made from carbon brush contact collector ring fixed position, used to connect to the power supply. The basic structure Many different kinds of motor, with the basic structure, www.dongfeng-motor.com its composition is mainly composed of the Stator (Stator) and the Rotor (Rotor). Stationary in the space of the stator, the rotor can be circuition, is supported by bearings. To expect a certain air gap between the stator and rotor, to ensure that the rotor can free rotation. On the stator and rotor winding coil, a magnetic field on the current, become electromagnet, the stator and rotor one of them for a permanent magnet.