Energy loss in magnetic switching cores

Technical Report · Fri Jul 01 00:00:00 EDT 1988

OSTI ID:6593429

Dougal, R A

This analytical study had two objectives. The first was to develop a computer code to model, temporally and spatially, the magnetization of amorphous ferrous materials (specifically Metglas) in an inductive circuit element under high surface field conditions while including the interaction of that element with the electrical circuit in a self-consistent manner. The second goal was to partition the energy losses experimentally measured in such a ferrous core according to loss mechanism by making comparisons between the experimental data and the computer simulation. The loss mechanisms considered were eddy current, hysteresis, and other. Experimental data to be compared with the results of the simulation had been previously collected at Los Alamos National Laboratory in the course of a program in which a 1 kHz, three stage magnetic modulator was built. However, inconsistencies in the experimental data became apparent as comparisons were being made between the results of the computer simulation and the LANL data. For this reason, the results in this report have been derived from experimental data supplied by Sandia National Laboratories. A key portion of this work was the development of a computer code to model the magnetization of the ferrous core material. The beginnings of the code had been developed by Howard Rhinehart and Bill Nunnally at Los Alamos, and were written in LASAN, the Los Alamos Systems Analysis language. In the early stages of this project, a great deal of time was spent adapting the LASAN program to run on the VAX computer here at South Carolina. Insufficient documentation proved to be the downfall of these efforts, and later (in retrospect, far to late) we abandoned the idea of running the simulation under LASN, and instead rewrote the simulation in ACSL, a systems simulation code which is supported on our VAX. 18 figs., 1 tab.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6593429
• Report Number(s): SAND-88-7103; ON: DE89004427
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ENERGY LOSSES
M CODES
MAGNETIC CORES
COMPUTER PROGRAM DOCUMENTATION
COMPUTERIZED SIMULATION
FERROMAGNETIC MATERIALS
MAXWELL EQUATIONS
NUMERICAL DATA
SWITCHES
COMPUTER CODES
DATA
DIFFERENTIAL EQUATIONS
ELECTRICAL EQUIPMENT
EQUATIONS
EQUIPMENT
INFORMATION
LOSSES
MAGNETIC MATERIALS
MAGNETIC STORAGE DEVICES
MATERIALS
MEMORY DEVICES
PARTIAL DIFFERENTIAL EQUATIONS
SIMULATION
420800* - Engineering- Electronic Circuits & Devices- (-1989)
990220 - Computers
Computerized Models
& Computer Programs- (1987-1989)
657000 - Theoretical & Mathematical Physics