An efficient flux weakening control strategy of a speed controlled permanent magnet synchronous motor drive for light electric vehicle applications

In this proposed work an efficient flux weakening control strategy of a four quadrant speed controlled Surface Mounted Permanent Magnet Synchronous Motor drive is presented. Permanent magnet synchronous motors are extensively used in light electric vehicle applications because it has large power density, high torque to inertia ratio, lower excitation losses and higher efficiency. In this proposed concept for speed controlled drive PWM current controller and PI speed controller is taken into consideration. For the implementation of such flux weakening control scheme a vector controlled surface mounted PMSM drive is established. It is emphasized that demagnetizing component of the d-axis current is introduced into the stator current. Therefore the proposed approach establishes better dynamic as well as steady state drive performance for high speed and energy efficient light electric vehicle applications. Hence a novel and efficient flux weakening control strategy is achievable.