Empirical parameter identification for a hybrid thermal model of a high-speed permanent magnet synchronous machine
Grobler, Andries Johannes
Van Schoor, George
Holm, Stanley Robert
MetadataShow full item record
An accurate thermal model will commonly require empirical parameter identification, specifically for the convection coefficients and interface resistances. A high-speed permanent magnet synchronous machine test platform, equipped with various temperature and power measuring equipment, is used to determine these parameters. Specifically, two tests, a dc injection test and rotational test with no load connected, were performed. The results were compared with a lumped thermal model and the parameters updated until an acceptable match was achieved. There were significant differences in the temperature rise when activating forced air cooling, thus significantly influencing the convection coefficients. Also, a significant difference in the interface resistances showed that in these high-speed machines, doing only the dc injection test will not give accurate interface resistance values. The work is novel through combining systematic empirical parameter identification to determine the convection coefficients and interface resistances for a machine where the end windings are cooled by forced tangential air flow
- Faculty of Engineering 
Showing items related by title, author, creator and subject.
A review of methods to predict the effective thermal conductivity of packed pebble beds, with emphasis on the near-wall region De Beer, M.; Du Toit, C.G.; Rousseau, P.G. (Elsevier, 2018)The effective thermal conductivity is an important parameter that is representative of the overall heat transfer in a packed bed of spheres. It includes the effects of conduction through the solid material and contact areas ...
Bouwer, Werner (North-West University, 2004)The South African economy, which is largely based on heavy industry such as minerals extraction and processing, is by nature very energy intensive. Based on the abundance of coal resources, electricity in South Africa ...
Multi–Sphere Unit Cell model to calculate the effective thermal conductivity in packed pebble beds of mono–sized spheres Van Antwerpen, W.; Rousseau, P.G.; Du Toit, C.G. (Elsevier, 2012)This paper presents a new approach to the calculation of the effective thermal conductivity in packed pebble bed reactors, namely the Multi-sphere Unit Cell model. The model specifically accounts for the porous structure, ...