Comparison of effects of overload on parameters and performance of samarium-cobalt and strontium-ferrite radially oriented permanent magnet brushless DC motors
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.
- Research Organization:
- Department of Electrical and Computer Engineering, Clarkson University, Potsdam, New York
- OSTI ID:
- 6497763
- Journal Information:
- IEEE Trans. Power Appar. Syst.; (United States), Vol. PAS-104:8
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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