The loads on the electrical systems of automobiles are projected
to increase significantly in the near future. This will result in a
requirement for improved efficiency over the present-day car
alternators. An alternative scheme proposed at Oregon State
University employs a Brushless Doubly-Fed Machine (BDFM) as an
alternator.
This thesis begins with a study and characterization of the
existing car alternator system. The configuration of the proposed
scheme is discussed. In the proposed configuration, the power
winding of the machine generates the bulk of the power and the
control winding provides the excitation. The power winding feeds a
power rectifier, which in turn charges the battery in an automobile.
The control winding is supplied through an inverter. Issues related to
inverter and rectifier design are discussed. A 3-phase pulse width
modulated inverter and a bridge rectifier were developed and tested
for performance. A PSPICE simulation model for the rectifier was
developed and results are compared with laboratory tests. A Voltage
Regulator Circuit (VRC) and an Efficiency Maximizer Unit (EMU) for
the system are designed and developed. A prototype alternator system
is tested and the principle of efficiency maximization is verified.
Finally. the comparative performance of the the existing and the
proposed system is discussed and some recommendations for further
improvements in the prototype system are made. / Graduation date: 1992
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/36918 |
| Date | 31 January 1992 |
| Creators | Javadekar, Virendra S. |
| Contributors | Spee, Rene |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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