Design and Electromagnetic Feature Analysis of AC Rotating Machines by Ahmed Masmoudi

Author:Ahmed Masmoudi
Language: eng
Format: epub, pdf
Publisher: Springer Singapore, Singapore

(2.33)

the expression of turns to be:

(2.34)

which is equal to:

(2.35)

where:

(2.36)

that leads to the expression of a rotating field at a speed equal to the current angular frequency , as:

(2.37)

In the manner of the fundamental, the space harmonics produce rotating fields at the same speed which are expressed as follows:

(2.38)

2.2.5 Generalisation

Let us consider a winding made up of q phases (with q an odd integer higher than unity) which are shifted by a electrical angle equal to . Let us consider the case where the phases are concentrated in q slot pairs of N turns each and are fed by sinusoidal currents. These have a rms-value and an angular frequency and are shifted by . The resulting fundamental rotating field is expressed as follows:

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