What is brushless motor, no and brush what is the difference?
The carbon brush is used as the two contact of the motor power supply, and is controlled by a speed change switch and a controller, and the stepless speed regulation of the electric bicycle 0-20 kilometers per hour is achieved by the two reduction of the gear and the overrunning clutch. The currently used brush high speed motor motor reduction gear high gold content, strong intensity, good abrasion resistance, reasonable design, so the repair rate is low; and the maintenance and replacement of gear and motor cost less, reduce the maintenance cost of electric bicycle; and brush electric machine can be achieved easily by overrunning clutch and flywheel human riding. Brush motor is to use brush mechanical reversing!
The difference between a brush motor and a brushless motor is whether it is equipped with a conventional brush commutator. The commutation of the brush DC motor is always achieved by touching the graphite brush with the ring commutator mounted on the rotor.The brushless motor will feedback the rotor position back to the control circuit through the Holzer sensor, so that it can learn the accurate time of the motor phase commutation. Most brushless motor manufacturers produce motors with three Holzer effect positioning sensors. Since brushless motor has no brush, it has no relevant interface, so it is cleaner and less noisy. In fact, it needs no maintenance and longer service life.
Brushless motor refers to brushless DC motor, which consists of motor, its main body and driver. It is a typical electromechanical integration product.Because of the brushless DC motor is controlled to run, so not like synchronous motor frequency control under heavy start as in the rotor plus a start winding, does not produce oscillation and step mutation in the load. The permanent magnet of small and medium capacity brushless DC motor is now using rare earth neodymium iron boron (Nd-Fe-B) material with high magnetic energy. Therefore, the volume ratio of the rare earth permanent magnet brushless motor reduces a frame number compared with the three-phase asynchronous motor of the same capacity.
