Brushless motor controller as popular with the users

Why how brushless motor controller is popular with the users? Let's look at. 1. Because in addition to the brushless motor controller brush, in use does not produce electric spark, thus reducing the electric spark interference of remote radio equipment. 2. Since there is no brush, generated by the friction force in the process of operation is small, so can ensure smooth running and low noise. 3. Since there is no brush, wear it focuses on the bearing, thus mechanical point of view can take it as a maintenance-free motor, do some cleaning maintenance can only when necessary. That is why how popularity of brushless motor controller.