Accession Number : AD0721561

Title :   A Limit Cycling Speed Control System.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Kocaoglu,Hasan

Report Date : DEC 1970

Pagination or Media Count : 96

Abstract : The concept of a limit cycling control in power supplies and speed control has advanced the application of these broad areas. ON-OFF switching of a thyristor provides a simple and economical method of control and regulation. This switching of the thyristor causes the system to limit cycle. Basic analysis and design of speed control was performed. A describing function was developed to model the power-supply and rectifier bridge. Then it was used to predict the frequency and amplitude of the limit cycle. A digital computer program was used to simulate the system response and to construct the describing function curves. To verify the describing function validity, the limit cycle predictions were compared with the simulated results. Fourier analyses were performed to determine the ripple instability and subharmonic effect of the system output. (Author)

Descriptors :   (*ELECTRIC GOVERNORS, ELECTRIC MOTORS), DIRECT CURRENT, THESES, TRANSISTORS, CONTROL SYSTEMS, NUMERICAL ANALYSIS

Subject Categories : Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE