Field Oriented Control of Brushless DC (BLDC) Motor for Electric Vehicle (EV) Applications

Abstract

The near possibility of extinction of fuels and natural gases in next three decades, has paved a way for Electric Vehicle in field of transportation. With no harmful emission it proves to be environment friendly. And in order to drive
EV there is hunt of better and efficient drive and control. BLDC motor with its high density to torque ratio, it allows
the EV to have less weight. When driven by Field Oriented Control, it produces ripple free torque, BLDC proves out
to be efficient driver. Because of its permanent magnet rotor, less wearing and losses, permanent magnet motors are
overtaking all industries. But PMSM, has a very complicated sinusoidal stator winding making it difficult to identify
rotor position as compared to BLDC motor having trapezoidal back emf. SVPWM switching technique which has
been used in this paper gives efficient switching. Further, in this paper, Field Oriented Control on BLDC motor, VSI
switched with SVPWM method in EV, with close loop torque control has been assessed. A 3.5Kw BLDC motor and
an EV of 480 Kg has been mathematically modelled for best results.