Brushless DC motors are increasingly popular in mobility applications for a number of reasons.
Firstly, they are the most efficient motors in terms of power density (broadly meaning that the power/area of the motor delivers the most power of any motor type). Secondly, they can operate at a range of voltages making flexibility a key option for designers. Thirdly, the fact that there is no friction within the motor apart from the bearings means that a well built and controllers brushless DC motor will last a lot longer than brushed DC alternatives.
There are a range of brushless DC control options which can also help – sensorless control is one of these options, four quadrant control can enable actively controlled deceleration and acceleration without the need of brakes and constant speed or torque enable reliable performance over uncertain terrain.