Flux Density

The nature of this machine means that it is possible to measure the flux density at various points along the translator before the stator coils were mounted. A Hall probe was used in order to validate the FEA work. Comparison between values predicted by the model given in Section 5.2 and experimental results for both radial and axial flux is given in Figure 5.32 and Figure 5.33. The correlation between the two is seen to be good.

Figure 5.32: Comparison of actual and predicted radial flux density


t*T I

* j. + + + +

+■ exp 1 * exp. 2



1 ■


0 20 CO SO 100 120 140 160 180

axial position iiri

0 20 CO SO 100 120 140 160 180

axial position iiri

Figure 5.33: Comparison of measured and predicted axial flux

N. J. Baker Chapter 5: The Air-Cored Tubular Machine Inductance

Figure 5.34: Comparison of experimental (V) and FEA(-) predicted self inductance of an entire phase

Figure 5.34 shows a comparison of the phase inductance calculated in the FEA with that measured in the prototype using a laboratory inductance analyser. Ignoring the small phase difference between the two signals, due to the arbitrary definition of zero position in the laboratory, they have the same wave length but the values differ by 7% at the minima to 10% at the maxima. This difference is likely to be due to a combination of the non uniform nature of hand wound coils and a degree of uncertainty with the prototype airgap.

Renewable Energy Eco Friendly

Renewable Energy Eco Friendly

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable.

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