1, Not necessarily, most of the original brush motor, but now mostly brushless.
2, Wheel motor technology is also known as wheel motor technology, its most prominent feature is the power plant, transmission and braking devices are integrated together into the hub, to be able to greatly simplify the mechanical parts of electric vehicles.
3, Brushless DC motor consists of the main motor and drive components, is a typical mechanical and electrical integration products. Brushless motor is brushless and commutator (or slip ring) of the motor, also known as no commutator motor. As early as the nineteenth century when the birth of the motor, the resulting practical motor is a brushless form, that is, AC squirrel-cage induction motor, this motor has been widely used. However, induction motors have many insurmountable defects that make motor technology slow to develop. The middle of the last century, the transistor was born, so the use of transistor commutation circuit instead of brushes and commutator brushless DC motor came into being. This new type of brushless motor, referred to as an electronically commutated DC motor, overcomes the shortcomings of the first generation of brushless motors.