Comparison of permanent magnet brushless motor with outer and inner rotor used in e-bike

This paper presents the comparison and optimization of a drive system used in an electric bike with outer and inner rotor permanent magnet brushless motor based on theoretical and experimental analysis of e-bike drive. The analyzed e-bike was equipped with the permanent magnet brushless synchronous motor with mechanical output power in range of 250W. The electric motor together with a planetary gear was mounted in a hub of 26 inch bike wheel. This kind of e-bike can reach maximum speed up to 25km/h. The aim of this paper is to investigate drive system used in the commercial e-bike with outer rotor, and theoretical analysis this same system combined with permanent magnet brushless motor with inner rotor. As a result of work the optimized motor topology with inner rotor is presented.