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.
Highlights
Synchronous generators are the major source of electrical power conversion to meet the existing demands
When the excitation is further reduced for the load current of 3.5A, the efficiency is improved from 55% to 77.6% and power factor from 0.55 to 0.66
The main focus is to improve the performance of synchronous motor during lightly loaded condition; by connecting load on the second winding the overall performance is improved
Summary
Synchronous generators are the major source of electrical power conversion to meet the existing demands. Double winding in the stator was recommended in the year 1930 for turbine alternators In this machine, when stator is energized, the revolving magnetic field established in the air gap is used to develop three-phase EMF in one set of winding at the same time, and a mechanical power is developed as conventional induction motor [7]. Dual stator winding machines may be considered for various motor and generating applications with more flexible energy conversion Both armature windings are of the same pole number, which may cause circulating currents due to unbalanced power supply [9]. While operated as synchronous generator, due to the two windings in the stator, the power and lighting loads can be separated, due to which the interruption to the lighting circuit can be minimized In this mode of operation, the machine can be considered as “Twin Generator” due to two distinct three-phase outputs
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