Innovative design for maximum MMF reduction

Document Type : Original Article

Author

Electrical & Electronics Eng. Fac., Istanbul Technical University, Istanbul, Turkey Electronic & Electrical Eng. Dep. Loughborough University, Loughborough, UK.

Abstract

Abstract:
This paper accompanies and complements a related companion paper [1]. A reduction in
the harmful effects of the space harmonics produced by the stator winding of an
induction motor can be obtained by constructional changes to the stator. It is possible to
reduce or even eliminate the most significant harmonics, according to the number of
slots per pole pair and based on numerical optimization involving both the slot positions
and the number of conductors per slot. Importantly, a high winding factor is preserved
in the resulting novel stator arrangement. The design of a motor with this arrangement is
compared with that of a standard motor, in terms of the cross sections of the stator and
rotor, slots and teeth, since various shapes of slots are required to contain the different
number of conductors per slot arising from the different shapes of the teeth. A
comparison between the main performance characteristics predicted for the two
machines demonstrates the operational benefits that are achieved.

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