The brushless dc motor controller, is have the advantages of dc motor controller and ac motor controller, the use of the dc motor controller for ever, even in recent years, the use of the ac motor controller, have the brushless dc motor controller is to take advantage of, the following introduce the work principle of brushless dc motor controller. Brushless DC motor controller is the rectification of the traditional DC motor controller part (Brush and commutator)Electronically instead and keep DC motor controller can sharp acceleration, speed, and is directly proportional to the applied voltage, torque and is directly proportional to the armature current, the motor controller of feature is very good. The greatest feature of the brushless dc motor controller for brushless structure, the relationship between the principle does not produce noise. Brushless motor controller of excitation part consists of a permanent magnet on the rotor, the armature is located in a stator, so you can don't need to brush the conduction current. So its driving circuit are commonly used PWM inverter, along with hall component test kit, or resolver poles can be smooth and stable torque, is often used for high speed and high precision control of the situation. Common dc motor armature on the rotor and the stator produce stationary magnetic field. In order to make dc motor rotation, through the commutator and brush need to continue to change the direction of the current in the armature winding and the two remain perpendicular direction of the field, to produce a constant torque drive motor rotation. In order to get rid of the brush, brushless dc motor (BLDCM) will be put onto the stator armature and rotor made of permanent magnet, so the structure of the reverse of ordinary dc motor; Even if such change is not enough, however, because of the stator armature by dc, can only produce constant magnetic field, the motor still turn up. In order to make the motor to turn up, it is necessary to make each phase winding of the stator armature continuously interlinked in electricity, so that the stator magnetic field with the position of the rotor are changing all the time, make the stator magnetic field with permanent magnet rotor magnetic field always stay around space Angle, torque drive the rotor rotation.
