English
简体中文
The reason why the brushless DC motor is widely used in electric vehicles is that it has the following two advantages compared with the traditional brushed DC motor.
(1) Long life, maintenance-free and high reliability. In a brushed DC motor, due to the high motor speed, the brushes and commutator wear quickly. Generally, the brushes need to be replaced after working for about 1000 hours. In addition, the reduction gearbox is technically difficult, especially the lubrication problem of the transmission gear, which is a relatively big problem in the brush solution. Therefore, the brush motor has problems such as high noise, low efficiency, and easy failure. Therefore, the advantages of brushless DC motors are obvious.
(2) High efficiency and energy saving. Generally speaking, because the brushless DC motor has no mechanical commutation friction loss, gear box consumption, and speed control circuit loss, the efficiency can usually be higher than 85%, but considering the highest cost performance in the actual design, in order to reduce material consumption , The general design is 76%. The efficiency of brushed DC motors is usually around 70% due to the consumption of gearboxes and overrunning clutches.
