Brushless dc motor the main advantage of dc motors is speed and good startup characteristic, locked-rotor torque, are widely used in various kinds of drive and servo system. However, dc motor has a brush and commutator, which formed by sliding mechanical contact seriously affected the precision of the motor, the performance and reliability of the sparks can cause radio interference. Shorten the life of motor, commutator brush device and complicated structure, big noise, make dc motor maintenance difficulties, people are seeking for a long time can not brush and commutator device of dc motor. with the rapid development of electronic technology, widely used in all kinds of high power electronic devices, this desire has been gradually implemented. This chapter will introduce the brushless dc motor using electronic switch circuit and position sensor to replace the brush and commutator, make the motor has the characteristics of dc motor. With ac motor has simple structure, reliable operation and convenient maintenance; Its speed is no longer limited by mechanical commutation, if using high-speed bearing, can in turn up to hundreds of thousands of revolutions per minute to run. yuan brush dc motor USES a very wide range, can be used as a general dc motor, servo motor and the torque motor, such as using, especially suitable for advanced electronic equipment, robotics, aerospace technology, numerical control equipment, medicine, chemical and other high-tech fields. Integrate circuit and motor brushless dc motor (BLDCM), the advanced electronic technology applications in electrical field, it will lead to motor technology updates, faster development.
