ABSTRACT
Synchronous machines are
dedicated to the specific application. They are generally employed in rolling
mills, pumps, fans, and compressors like reprobating and centrifugal drives,
pulp and paper processing, water treatment, mining, and in cement industries.
As a synchronous motor, the performance is reduced for the given excitation
while the load increases. When operated as synchronous generators, both power
loads and lighting loads depend on the output from the armature winding. This
paper presents an alternative choice in which by providing an additional
winding in the stationary armature, when operated as a Double Winding
Synchronous Motor (DWSyM), it becomes possible to operate in maximum power
factor by adjusting the loads on both the stator windings. When operated as
conventional motor, for the load current of 3.5 A, the efficiency is 55% and
power factor is 0.55, for the same excitation when second winding is connected
to a load current of 1 A, the efficiency is improved to 77.6% and power factor
is improved to 0.66. The main focus of this machine is to improve the
performance of the machine for the reduced excitation and minimum load. For the
reduced excitation, the performance can be improved by loading both the
windings. While operated as Double Winding Synchronous Generator (DWSyG), two
stator outputs are available which help to separate the power and lighting
circuits. Hence, interruption in the lighting circuit can be limited, this
machine can be considered as Twin generator.