| Abstract |
In this paper a Direct Flux and Torque Control Scheme (DTC) for Electric Vehicle
(EV) Induction motor (IM) drive is presented. The control algorithm utilizes the stator flux as control
variable and the flux level is selected in accordance with torque demand of EV’s to achieve the
efficiency optimized drive performance. The proposed scheme allows a smooth transition into the
field weakening region and the full utilization of the inverter current capability during acceleration or
regenerative braking of EV. The advantage of proposed IM torque and flux vector control scheme
prevails over this conventional control scheme since no extra speed sensor is used. The another
advantage is its simple microprocessor implementation. The drive system, including a 18 kW, 4 pole
6000 RPM, 120 V battery-powered IM and a 30 kVA IGBT inverter, has been applied to a pick up
truck. Road test running of the truck has verified that the proposed control strategy is practical. |
