1. Brushless DC motor: refers to the brushless DC motor by the motor, its main body and driver, is a typical mechatronics products. Since the BLDCM operates in an automatic manner, it will not add a starting winding to the rotor like the synchronous motor starting under heavy load under frequency conversion speed regulation, nor will it oscillate and out of step when the load changes suddenly. Nowadays, rare earth Nd-Fe-B (Nd-Fe-B) materials with high magnetic energy product are widely used in permanent magnets of medium and small capacity brushless DC motors. Therefore, the volume of rare earth permanent magnet brushless motor than the same capacity three-phase asynchronous motor reduced by a seat number.
2. The difference between brushless and brushless machines is whether the equipment can be equipped with common brushes and commutators. The commutation of a brushless DC motor is always accomplished by a battle between a graphite brush and an annular commutator mounted on the rotor. The BLDCM reacts the rotor position back to the control circuit via a Hall sensor, allowing it to know the time of electromechanical phase reversal. Most brushless electromechanical manufacturers have three Holzer effect positioning sensors. Because brushless machines have no brushes, they have no coherent interfaces, so they are cleaner, less noisy, virtually unprotected, and have longer life spans.