DESIGN CONTROL OF 120 KW BLDC USING MODIFIED FIELD ORIENTATION CONTROL (MFOC) METHOD FOR ELECTRIC BUS VEHICLE APPLICATION

• Main Author: Rivandi Fadli, M
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/71317
• Institution: Institut Teknologi Bandung

This research has purpose to design a 120 kW BLDC motor control algorithm specifically for electric bus applications, specially for torque and speed control. In addition, this study also identify the load generated by the motion of bus under certain conditions and modeled as a load of the motor. In this study, the Mercedes-Benz OF-917 bus was chosen as a reference for determining the parameters used to calculate load torque. The BLDC control technique used in this study is the modified field orientation control (MFOC). The electromagnetic torque produced from this method has the smallest torque ripples (20.99%) compared to the trapezoidal method (27.86%) and FOC (25.77%). From this research, it is known that the total torque load is based on 4 factors: acceleration load, drag load, grading load, and tyre rolling resistance load. The maximum value of the total torque load when the road is flat with the low gear is 4827.12 Nm, the torque load when the road is flat with high gear is 1967.68 Nm, and the torque load when climbing 10% with low gear is 6015.85 Nm. Meanwhile, when uphill, high gear cannot be used. Then from the trend the efficiency of the inverter rises according to the rise of the inverter power input. The maximum efficiency is 99.28% at peak power of inverter, which is 169 kW. From this study, the torque control algorithm was successfully implemented for bus operations on flat roads, uphill, and regenerative braking modes. After that, from this study, speed control algorithm was also successfully implemented in cruise control mode to reach target speed at 90%.