A, brushless dc motor controller: refers to the brushless dc motor controller by the motor, it consists of main body and the drive, is a typical mechatronics product. Because of brushless dc motor based on self-control type operation, so don't like frequency control of motor speed under overloading starting of synchronous motor controller as plus startup winding on the rotor, also won't generate oscillation and step out when load mutation. Medium and small capacity of the permanent magnet brushless dc motor (BLDCM), now many adopt high rare earth ndfeb magnetic energy product (钕铁硼永磁)Data. Volume ratio is, rare earth permanent magnet brushless motor with three-phase asynchronous motor capacity reduces a frame number. Second, is the difference between with and without flash flash electric power: can set decoration equipment commonly used brush and commutator. Have brushless dc electrical and mechanical reversing graphite brush has been through the process and installation of war in the ring on the rotor commutator phase. While no flash electricity through a process of hall sensor to rotor position response back to control circuit, make its can perhaps learn mechanical and electrical phase commutation time. Most labor contractor labor without flash electricity mechanical positioning with three hall effect sensors. Because there is no brush, no flash electricity so no coherent interface, is cleaner, less noise, in fact no need protection, longer life.