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ABSTRACT
A direct drive system with anti-skidding ability for electric cars is proposed. This system is based on switched reluctance motors and fuzzy logic control. A switched reluctance motor and its hybrid power electronic converter are designed at first. Then a fuzzy rule base is constructed and drive system's computer simulation is achieved. A PC based digital fuzzy logic controller software and necessary enviromental hardware are realized and some experimental results are obtained. The simulation and experimental results show that the developed system succesfully drives the wheels and effectively prevents the system from skidding at any road and driving conditions.
During the past decade, there has been extensive research activities on electric vehicles (EV). Basically there are two main drive schemes for EV's. In the first group, the motor control technology involves to rotate the main shaft of the vehicle, similar to the combustion engine driven vehicles where power is transmitted to the wheels through a mechanical differential. The second group which is called direct drive, wheels are driven directly by the motors. Among these, brushless d.c. and switched reluctance motors with some unconventional topologies are worth to mention.
Direct drive offers various advantages. Elimination of the mechanical differential gearbox reduces the weight and the mechanical power losses and improves the overall efficiency. However, there are certain disadvantages as well. Since each wheel is driven individually, their torque and speed should be regulated continuously. It is also necessary to sustain the stability of the car even it is travelling on a flat road. Anti-skid control is another parameter for uneven slippery roads. As a result, control is complex with higher cost and lower reliability.
PHOTOGRAPHS
Stator and rotor laminations of real and experimental model of wheel driver SRMs
A close view of SRM and optical position sensor
SRM driver circuit
A/D and D/A converters and current controller of SRM circuits
An ordinary pc mainboard and developed i/o cards for fuzzy controller
Overall view of experimental system
