Brushless DC Motor
Most of the shop vendors will advice you to go for a brushless DC motor, not because they are expensive, but because they are reliable. Reliability should always be your top priority when buying an electric bike. These brushless motors are one time investment and will last you a lifetime!
Basically, a brushless DC motor is a synchronous electric motor. And as the name suggests, it is powered by direct current electricity (DC). What makes these motors so reliable is an electronically controlled commutation system. This commutation system gives brushless motors an upper hand because brushed motors use a mechanically controlled commutation system. This includes direct contact between the brushes and constantly rotating commutator. This physical contact results in loss due to heat, loss in efficiency and loss in output torque.
In a brushless DC motor, electromagnets do not move. Instead, the permanent magnet rotates. Now in order to transmit current to a moving armature, an electronic controller is used. Basically, it is a microprocessor based electronic component which determines the position of motor and instructs the magnets accordingly. This electric controller performs same task as that of the mechanical commutation system in a brushed motor.
As current and torque, voltage and RPM are linearly related, brushless motor give more output torque at a higher efficiency!
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