Two different types of motors are commonly chosen for the
auxiliary drive of such vehicles: DC Brushed motors and
radial flux DC Brushless motors with permanent magnets
(RFPM). Mostly for its reduced size and higher efficiency a
DC Brushless motor with a particular shape a so-called hub
motor – can also be selected (external rotor and internal
stator). For this work a 250W DC brushed motor has been
selected. The electric motor is positioned on the rear wheel for
a simpler installation. The power transmission system is of the
direct drive type, so that gears and coupling joints are
avoided.