Perancangan dan Implementasi Sistem Monitoring Kecepatan Motor BLDC Hub Bergir pada Sepeda Listrik

Abstract

Recently, technology development of Electric bike grows fast. The addition of planetary gear is one kind of electric bike driver development. Planetary gear can increase motor output torque. So, for the same (output) torque, motor will be smaller and lighter. In this digital era, electric bike parameter measurement is very important. Not only for research and technology development, the data can also be used to measure performances of the user. One of important parameters on electric bike is speed. Basically, speed measurement can be calculated from wheel speed. In case of BLDC motor, on electric bike driver, the wheel speed measurement can be done by using internal hall sensor. This method can't be used on geared hub BLDC motor. The motor use overrun clutch that can make the wheel freely spin when the motor is not energized. The motor is not spinning even the wheel is mechanically spinning and the output signal of hall sensor is constant. The aim of this research is to propose speed monitoring mechanism for geared hub BLDC motor drive electric bike using external hall effect and reed switch sensor. The result show that the proposed mechanism can accurately measure the dynamic profile of wheel speed with maximum error less than 2,5%, if we compare with RPM meter with the value of deviation standard less than or equal to ±1,5 rpm. The proposed mechanism still has good accuracy and precision in spite of the addition of computational load on microcontroller. It indicates that the propose mechanism can be implemented on a complex system.