Design and development of the DTC induction motor drive for electric vehicle

The design and development of the traction controller for electric vehicle is introduced, which is based on the induction motor. This drive is developed by using a digital signal processor at low cost and carried out with the module design concept of both software and hardware. Moreover, the feasibility of a scheme of the sensorless direct torque control, based on the developed hardware, is tested by a trial program. Additionally, both the interface function of the drive hardware and the feasibility of its software are proved to the good by the trail programs. The test motor can run about 18 r/min by a variable frequency program with the space vector pulse width modulation technology, of which the torque is visible pulsatile. In this presentation, based on the theoretical approach, the sensorless torque control is to be studied and applied to electric vehicles, of which the quick, smooth and stable torque response is emphasized because it quite benefits improving the drive performance of electric vehicles.