Design of a New Switched-Stator BLDC Drive to improve the energy efficiency of an Electric Vehicle

Abstract

A technique of switched stator is employed in a radial Flux BLDC motor to improve the energy efficiency of an electric vehicle. Electric vehicle (EV) certainly, shall be a replacement to the gasoline engine vehicles in near future considering environment protection inadequacy of fuels. This concept is arrived for in wheel direct drive for a two wheeler which doesnt have any transmission mechanism. The battery drive system should be highly efficient to make the EV to overcome its speed, load and mileage limitations. The technique of switched stator BLDC motor is arrived to improve the efficiency of battery by switching the outer and inner stator of BLDC motor which are designed with different torque/back-emf constants. This paper presents the configuration of vehicle drive train, architecture of Switched stator-BLDC (SS-BLDC) motor and its control strategy to achieve the required objectives. Simulation model of the total electric propulsion is built and analysis carried out by taking a standard driving schedule. Important performance indices of vehicle are derived and the results are very encouraging.

Existing System

Electric motor drive selection issues for HEV propulsion system.

Proposed System

In this paper a new electric vehicle drive train configuration with Switched Stator BLDC motor (SS_BLDC) is proposed to improve the energy efficiency of the vehicle. The complete model comprising SS-BLDC, Battery, Vehicle model and controller developed in MATLAB/SIMULINK. Simulation is carried out with standard driving schedule and arrived at major performance indices of the vehicle. The results are compared with conventional configuration of electric vehicle drive train.

Architecture

Proposed configuration of In-wheel electric drive train