(1) long life, maintenance-free, high reliability. In the brush DC motor, due to high speed, brush and commutator wear faster, the general work 1000 hours or so need to replace the brush. In addition, the technical difficulty of the gearbox is more difficult, especially the lubrication problem of transmission gears, which is a big problem in the brush scheme at present. Therefore, there are some problems, such as large noise, low efficiency and easy to produce faults in brush motor.Therefore, the advantages of brushless DC motor is obvious.
(2) High efficiency, energy saving. Generally speaking, brushless DC motor without mechanical reversing friction loss and gearbox consumption, as well as speed control circuit loss, efficiency is usually higher than 85%, but taking into account the actual design of the highest cost-effective, in order to reduce material consumption, the general design of 76%. The efficiency of a brush DC motor is due to the consumption of gearbox and overrunning clutch, usually around 70%.