There are many possible types of electric motorized vehicles with several technologies available, varying in cost and complexity; direct-drive and geared motor units are both used by Romai. An electric power-assist system may be added to almost any pedal cycle using chain drive, belt drive, hub motors or friction drive. Brushless DC hub motors are a common modern design with the motor built into the wheel hub itself and the stator fixed solidly to the axle and the magnets attached to and rotating with the wheel, which is widely used within Romai two-wheel vehicles. The power levels of motors used are influenced by available legal categories and are often, saying Indian authority command it under 250 watts.
Hall sensor commutation
Motor speed measurement
Potentiometer-adjustable motor speed
Closed-loop speed control for precise speed regulation