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In three-phase induction machines, the non-sinusoidal winding distribution normally causes space harmonics in the air-gap field, with negative impacts on stray-load losses and parasitic torques. An appropriate coil pitch choice is a traditional design strategy to improve the air-gap field waveform. In this paper an alternative technique is investigated based on using stator coils with unequal size...
Large AC machines are sometimes fed by multiple inverters. This paper presents the complete steady-state analysis of the PM synchronous machine with multiplex windings, suitable for driving by multiple independent inverters. Machines with 4, 6 and 9 phases are covered in detail. Particular attention is given to the magnetic interactions not only between individual phases, but between channels or groups...
The winding copper loss can be significantly increased due to skin and proximity eddy current effects. The skin and proximity losses due to fundamental frequency current has been investigated in literature, but the influence of PWM on the skin and proximity losses has not been reported. In this paper, 2-D finite element method is employed to analyze the skin and proximity losses in a permanent magnet...
This paper introduces the concept of fractional conductor windings for AC-machines. They allow to obtain fractional equivalent number of conductors per slot. Different arrangements of windings are presented. The harmonic spectrum of the armature magneto-motive force in the air-gap is then analyzed in order to derive rules for choosing suitable combinations using winding factors.
This paper represents a winding design technique for multi-phase, especially three-phase machines. The winding distribution, the winding factor and some winding qualification characteristics like THD and differential leakage are calculated on the basis of general rules of symmetrical AC windings.
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