SMFIR TECHNOLOGY BASED TRANSPORTATION SYSTEM AND APPLICABILITY OF MPPT

Abstract

The trend towards electric vehicle is one of the efforts to reduce the consumption of energy and to minimize the negative environmental impact on earth. However, there are several issues to commercialize electric vehicle. The large capacity, weight, expensive price, short life time and charging time of batteries are the most important obstacles. On-Line Electric Vehicle (OLEV) is an innovative electric powered transportation system which remotely picks up electricity from power transmitter buried under ground. The core technology of OLEV is based on SMFIR (Shaped Magnetic Field in Resonance). The input supply frequency is converted to a very high frequency at inverter stage and this high frequency current flow through the power line. The magnetic flux generated from the power lines is gathered at the pick-up module and then rectified. The rectified output energy is stored in a battery and used for driving the motor. OLEV requires only a minimal battery capacity which can consequently minimize the weight and price of vehicle and power station. By improving power supply and pick-up modules the power transfer capability can be extended for driving the train which can even beat maglev. Although OLEV technology is similar to maglev in lack of contact, the two systems use electromagnetic fields in different ways. A magnetic levitation system uses the repulsive force between magnetic flux for motion, whereas OLEV uses magnetic flux, which is converted into electrical energy, to drive motors. The rectified power output in the pickup module can be consider as a variable dc source, like PV cell, because power output will be varied according to the alignment between primary and pick-up module. So by using MPPT algorithm the induced power in the pick-up module can be transfer efficiently to the motor.