ABSTRACT
The non-linear B/H relationship for vicalloy and even steel when saturated, and complex machine geometry would make it difficult to derive magnetic flux density variation from first principles. The measured radial flux density waveforms are used in conjunction with Maxwell’s equations to derive the various waveforms in the air spaces; in particular the peripheral flux density waveforms are obtained both for the vicalloy and air rotor. Although waveforms of radial flux density were available from the outputs of the full-pitch search coils, both in the airgap and arbor region, ‘new’ waveforms were evaluated for two main reasons. Firstly, the new waveforms were calculated at the same values of angular position as all other waveforms which made comparison much easier. Secondly, it was essential to have the variation known on the internal and external rotor surfaces rather than at any other radii.
