Brushless motor is the use of semiconductor switching devices to implement the electronic commutation, nidec i.e. electronic switching device instead of the traditional contact-type commutator and brush. It has high reliability, no commutation spark, and low mechanical noise, widely used in high-end tape deck, VCR, electronic equipment and office automation equipment.
　　The brushless motor by a permanent magnet rotor, multi-pole stator windings, position sensors and other components. Change of rotor position sensing by the position, along a certain sequence of the stator winding current commutation. Operating voltage brushless DC motor stator winding electronic switching circuit controlled by a position sensor output provided.
　　Using standard DC speed machine
　　In the application of direct current governor in advance to do the following standards:
　　1, need a wide speed range.
　　2, need a faster dynamic response.
　　3, plus the need to automatically process a smooth transition during deceleration.
　　4, when the torque required low speed.
　　5, the need for better excavator characteristics, servo can overload current limiting on the set current.