Design and Development of Electronic Speed Controller for Axial Flux BLDC Motor

Abstract

Axial Flux Motors(AFM) are the ultimate future of the EV sector, as AFM have high energy density and provide high torque to weight ratio as compared to radial flux configuration BLDC and Induction motors. In this paper, we propose to build an electronic speed controller for AFM. Currently available electronic speed controllers (ESC) are for drone BLDC motors in radial flux configuration and are of the capacity of 250 watts to 2 kW. This paper presents ESC for Axial flux BLDC for 2 kW to 10 kW capacity for e-bike application and for retrofitting in rickshaws and small pickups. In order to get a high fill factor (up to 90 per cent), a square-shaped copper wire has been used. The yoke-less structure helps us to reduce the stator mass, making the motor light-weight. The Axial flux BLDC can achieve up to 20,000 RPM. High RPM allows the use of axial flux motors in most of the mobility applications. This paper presents the work done for high power electric bikes (2kW-10kW) control using ESC.