الفهرس 
ELECTRIC VEHICLESOnly 14 pages are availabe for public view
 |  | from | 210 |  |  |
| | | from | 210 | | |
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