1. Performance Analysis of a Self-Excited Passive Compulsator Driving a Railgun With Field Winding Excited by a Secondary Armature.
- Author
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Kulkarni, A. S. and Thomas, M. Joy
- Subjects
- *
AIR gap flux , *ARMATURES , *CAPACITOR banks , *ACTINIC flux , *DENSITY currents - Abstract
A passive compulsator is being designed and developed in this article to drive a railgun which has been built and tested earlier using a capacitor bank in the author’s laboratory. In this article, the analysis has been done for various machine parameters for a self-excited passive compulsator. A secondary armature on the stator has been used as a source for the self-excitation of the field winding as the primary armature is being optimized for the main discharge current pulse. The field excitation of the compulsator is assumed to be transient in nature. The main parameters to be analyzed in the compulsator design in this case are as follows: 1) the time required for the air gap flux density to reach the rated value; 2) the power loss in the compulsator during self-excitation; and 3) the maximum field current. During the self-excitation, currents induced in the compensation shield slow down the overall process of field excitation and also result in high field current affecting the design of the field circuit converter (FCC). A number of probable designs were modeled and simulated for different diameters of the rotor, the number of field winding turns, nominal field current density, and compensation shield thickness, and the above-mentioned parameters were compared. The same analysis has also been compared with the performance of the compulsator in the main operation, that is, driving the railgun, so as to decide the range for some of the design parameters. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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