The Art and Science of Rotating Field Machines Design: A Practical Approach by Vlado Ostović

Author:Vlado Ostović
Language: eng
Format: epub, pdf
Publisher: Springer International Publishing, Cham

When the machine is loaded, the stator ampere-turns superimpose to those created by the field current in Fig. 3.18. At the given operating point, the power factor is obviously strongly lagging, since the armature reaction managed to decrease significantly the no-load air gap flux density distribution.

Fig. 3.18Air gap flux density distribution in a claw pole synchronous machine at rated load [8]

3.5 A Straightforward Method for the Solution of Flux Distribution in Magnets

Assume a machine with surface-mounted magnets, the geometry of which is shown in Fig. 3.19. As shown in [3], the discretization of machine’s magnetic circuit is fine enough if a single tooth, or a yoke segment between two adjacent teeth, is taken as smallest elements, because of their high relative permeability and because their form coincides with flux tubes placed in the machine geometry. A magnet, on the other hand, generates flux components, the amounts of which are dependent not only on magnet parameters, but also on the geometry of the rest of the magnetic circuit [9]. Besides, the relative permeability of magnets does not differ substantially from 1, the relative permeability of air.

Fig. 3.19Electric machine with surface-mounted magnets

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