1. Brushless refers to the brush. 2 is usually permanent magnet brushless motor, divided into permanent magnet synchronous and permanent magnet dc motor, brushless is no brush, thus eliminating the brush that a set of things, structure simple. For electric vehicles or other power larger motor, permanent magnet motor than traditional electric excitation motor and power density is big, eliminating the rotor winding. Weakness is permanent magnet cost is high, need special range of speed control mode, and the corresponding motor structure also need to do some change. 3 motor internal complex, usually don't like what you said has linear formula, but the general judgment, the motor volume, the greater the power, the greater the same volume of the longer the axial length, speed faster, smaller torque. Permanent magnets generally due to the processing production considerations, make it more rectangular, the stronger the magnet, the greater the torque may be.
