Sensorless Control with Back EMF Integration Method for E-bike

With ever-increasing concerns on our environment, there is a fast growing interest in electric bike with a motor mounted either at the front and at the rear wheel. In addition, there it is a pressing need for researchers to develop advanced electric-drive systems. This paper investigates potential performances and describes the running mode of an e-bike for transportation which uses a Brushless DC motor with an outer rotor mounted at the front wheel with a nominal torque of 10Nm and 250W with planetary gear. The controller uses an outer speed and inner current control loop using sensorless technique back-EMF based.. It is shown that the e-bike is able to start and run at convenient speed estimated with average minimum speed of 2Km/h and high speed up to 25 Km/h with a battery autonomy lasting up to 2h under semi flat and hilly distance less than 7%. We show that this speed control from low and high speed can be well tuned and adapted to various paths that fits the cyclist own comfort and desired acceleration. Also, the findings show also that the battery autonomy can be doubled if there is intermittent cycling periods.