الفهرس | Only 14 pages are availabe for public view |
Abstract The use of electric vehicles (EV) is very important today because it will create a healthier environment without noise. Seriously it is a dream for tlte human being specially when the world oil resources decrease. The optimum choice for a particular drive suitable for EV depends on a detailed assessment of the initial costs, dynamic performance, ease of maintenance, robustness, weight. A comparison was done between some different electrical motors such as direct current motors (DC), induction motors (IM), switched reluctance motors (SRM) and permanent magnet synchronous motors (PMSM). The comparison shows that PMSM has: high efficiency, silent operation, wide speed range, low weight, high flexibility, simple control and easy maintenance. So it is expected that within few years PMSM will be the cheapest motor including its electronics control circuits, in this case it will be the most suitable motor for the application of EV. The thesis presents the detailed arithmetic analysis for PMSM at different ·cases of operations. The control system of this application is chosen to be fuzzy logic control (FLC) because it has the ability to make the motor torque stable, accurate and efficient. On the other hand the FLC system has simpler arithmetic and easy to be realized, and the FLC technique used can be slightly modified to suit various industrial applications. The simulation of pulse width modulated (PWM) inverter fed PMSM controlled by FLC is done for two different motors, high and low power, at open loop (without using FLC) and at closed loop (with the use of FLC). This was carried out under the computer software program (MATLAB). Good results were obtained and presented in detail. They indicate that FLC is a good choice for taking decisions in EV application, for various motor ratings. The design and implementation of the system is done using an intelligent power module (IPM) with 6 IGBT transistors composing the inverter. The FLC is realized by using C language programs that control the system through an analogue to digital (AID) input output card. The results can be concluded as follows: 1) The comparative study shows that the PMSM will be the most popular electrical drive for EV, from pointview of weight, cost, efficiency. 2) Simulation results indicate that FLC is a good choice for taking decisions for EV application, in case of the variation of speed and limitation of current. 3) A complete experimental system is implemented that includes the motor, the inverter and a control system that can be operated from the personal computer (PC). 4) All the electronics control circuits used are designed and implemented. 5) The IPM system and its controlled drive circuit is implemented completely and it shows that IPM with 6 IGBT is very compact, efficient and has good reliability. 6) Design and verification were done to make a feed forward system for controlling the motor torque. 7) Design and verification were done to compute the flux linkage variation for choose the wanted range of speed. 8) The experimental tests confirm the theoretical results obtained and are in good agreement |