, the principle of brushless dc motor -- - - - - -Brushless dc motor is a kind of synchronous motor, that is to say, the motor rotor speed of the motor speed rotating magnetic field of the stator and rotor pole. Brushless dc motor has the advantages of traditional dc motor and canceled the carbon brush and slip ring structure; Stepless speed regulation, wide speed range, strong overload capacity; High reliability, good stability and strong adaptability, simple repair and maintenance and so on. Brushless dc motor reversing circuit consists of two parts, drive and control, it is not easy to separate the two parts, especially small power circuit integration between the two usually become single application-specific integrated circuit. , the principle of brushless dc motor --Advantages of dc motor with rapid response, large starting torque, rotating speed of from zero to rated speed can provide the rated torque performance, but the advantages of dc motor is also its drawback, because the direct current machine to produce a constant torque under rated load, the performance of the armature magnetic field and rotor magnetic field must be constant to maintain °, this is about to borrow from the carbon brush and commutator. Carbon brush and commutator motor rotation would produce sparks, carbon powder, so besides can cause damage of components, its usage is restricted. , principle of brushless dc motor, brushless dc motor is composed of main body of the motor and drive, the stator winding of the motor to make more balanced three-phase y connection, and is similar to the three-phase asynchronous motor. On the rotor of the motor with the magnetization of the permanent magnet has, in order to detect the polarity of the motor rotor, inside the motor is equipped with position sensor. Drive consists of power electronic devices and integrated circuit, its function is: accept the motor start, stop, brake signal, to control the motor start, stop, and the brake; Accept the position sensor signals and positive &negative, used to control the inverter bridge on and off of each power tube produce continuous torque; Accept the speed instruction and speed feedback signal, which is used to control and adjust the speed; To provide protection and display, and so on.
