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Title: Comparison of effects of overload on parameters and performance of samarium-cobalt and strontium-ferrite radially oriented permanent magnet brushless DC motors

Abstract

Effects of high momentary overloads on the samarium-cobalt and strontium-ferrite permanent magnets and the magnetic field in electronically commutated brushless dc machines, as well as their impact on the associated machine parameters were studied. The effect of overload on the machine parameters, and subsequently on the machine system performance was also investigated. This was accomplished through the combined use of finite element analysis of the magnetic field in such machines, perturbation of the magnetic energies to determine machine inductances, and dynamic simulation of the performance of brushless dc machines, when energized from voltage source inverters. These effects were investigated through application of the above methods to two equivalent 15 hp brushless dc motors, one of which was built with samarium-cobalt magnets, while the other was built with strontium- ferrite magnets. For momentary overloads as high as 4.5 p.u. magnet flux reductions of 29% and 42% of the no load flux were obtained in the samarium-cobalt and strontiumferrite machines, respectively. Corresponding reductions in the line to line armature inductances of 52% and 46% of the no load values were reported for the samarium-cobalt and strontium-ferrite cases, respectively. The overload affected the profiles and magnitudes of armature induced back emfs. Subsequently, themore » effects of overload on machine parameters were found to have significant impact on the performance of the machine systems, where findings indicate that the samarium-cobalt unit is more suited for higher overload duties than the strontium-ferrite machine.« less

Authors:
; ;
Publication Date:
Research Org.:
Department of Electrical and Computer Engineering, Clarkson University, Potsdam, New York
OSTI Identifier:
6497763
Resource Type:
Journal Article
Journal Name:
IEEE Trans. Power Appar. Syst.; (United States)
Additional Journal Information:
Journal Volume: PAS-104:8
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; ELECTRIC GENERATORS; LOAD ANALYSIS; OVERVOLTAGE; PERFORMANCE; BINARY ALLOY SYSTEMS; COBALT ALLOYS; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; ELECTROMOTIVE FORCE; FABRICATION; FINITE ELEMENT METHOD; IRON ALLOYS; MAGNETIC FIELDS; MAGNETIC FLUX; PERMANENT MAGNETS; SAMARIUM ALLOYS; STRONTIUM ALLOYS; ALLOY SYSTEMS; ALLOYS; MAGNETS; NUMERICAL SOLUTION; RARE EARTH ALLOYS; SIMULATION; 200104* - Fossil-Fueled Power Plants- Components

Citation Formats

Demerdash, N A, Nehl, T W, and Nyamusa, T A. Comparison of effects of overload on parameters and performance of samarium-cobalt and strontium-ferrite radially oriented permanent magnet brushless DC motors. United States: N. p., 1985. Web. doi:10.1109/TPAS.1985.318802.
Demerdash, N A, Nehl, T W, & Nyamusa, T A. Comparison of effects of overload on parameters and performance of samarium-cobalt and strontium-ferrite radially oriented permanent magnet brushless DC motors. United States. https://doi.org/10.1109/TPAS.1985.318802
Demerdash, N A, Nehl, T W, and Nyamusa, T A. 1985. "Comparison of effects of overload on parameters and performance of samarium-cobalt and strontium-ferrite radially oriented permanent magnet brushless DC motors". United States. https://doi.org/10.1109/TPAS.1985.318802.
@article{osti_6497763,
title = {Comparison of effects of overload on parameters and performance of samarium-cobalt and strontium-ferrite radially oriented permanent magnet brushless DC motors},
author = {Demerdash, N A and Nehl, T W and Nyamusa, T A},
abstractNote = {Effects of high momentary overloads on the samarium-cobalt and strontium-ferrite permanent magnets and the magnetic field in electronically commutated brushless dc machines, as well as their impact on the associated machine parameters were studied. The effect of overload on the machine parameters, and subsequently on the machine system performance was also investigated. This was accomplished through the combined use of finite element analysis of the magnetic field in such machines, perturbation of the magnetic energies to determine machine inductances, and dynamic simulation of the performance of brushless dc machines, when energized from voltage source inverters. These effects were investigated through application of the above methods to two equivalent 15 hp brushless dc motors, one of which was built with samarium-cobalt magnets, while the other was built with strontium- ferrite magnets. For momentary overloads as high as 4.5 p.u. magnet flux reductions of 29% and 42% of the no load flux were obtained in the samarium-cobalt and strontiumferrite machines, respectively. Corresponding reductions in the line to line armature inductances of 52% and 46% of the no load values were reported for the samarium-cobalt and strontium-ferrite cases, respectively. The overload affected the profiles and magnitudes of armature induced back emfs. Subsequently, the effects of overload on machine parameters were found to have significant impact on the performance of the machine systems, where findings indicate that the samarium-cobalt unit is more suited for higher overload duties than the strontium-ferrite machine.},
doi = {10.1109/TPAS.1985.318802},
url = {https://www.osti.gov/biblio/6497763}, journal = {IEEE Trans. Power Appar. Syst.; (United States)},
number = ,
volume = PAS-104:8,
place = {United States},
year = {Thu Aug 01 00:00:00 EDT 1985},
month = {Thu Aug 01 00:00:00 EDT 1985}
}