Hub motors : Mechanism
Ever wondered why your electric bike does weight so less as compared to other conventional bikes? Conventional bikes use raw mechanical power to run. They include various mechanical transmission systems like gear box, differentials, axels and chains. Each and every component included in the mechanical transmission system contributes to energy loss of up to 30-40%. So what is so special about electric bikes? The answer is their mechanism. Or in particular, the mechanism of hub motor.
Hub motor consists of two magnetic coil windings, one stationary and other rotary. The power is supplied to the stationary winding which produces a magnetic field in the motor assembly. The rotary winding follows or tries to follow that magnetic field. In the process, it cuts the magnetic flux lines. As a result of which the rotor shaft rotates and we obtain some torque which drives the wheel. Now the power generated in the motor by cutting flux lines is transmitted to a brushed motor through physical contact of brushes to the rotating shaft of the motor. This physical contact results in loss of energy due to various factors like heat, friction etc.
Though they are expensive, brushless hub motors transmit power without any losses. As they transmit power electrically, there are no mechanical transmission systems required which results in no power loss!
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