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The behavior of rotor eccentricities in current regulated interior permanent magnet (IPM) machines is investigated. The study focuses on two typical topologies of significant industrial relevance, i.e. machines with distributed windings with two slots per pole and phase and motors with concentrated coils and with three slots per pole pair, respectively. The effect of stator winding parallel paths...
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...
The paper presents an approach to modeling of shorted turns in rotor field winding of synchronous generator using finite element method. It enables detailed analysis of magnetic field at several operating conditions under healthy and faulty states which are difficult or even impossible to carry out by available measurement methods in industrial environment. Modeling of field winding faults are performed...
The paper at hand introduces a comparison between an analytic method and a numerical calculation for the determination of turbo generator end winding inductances under steady-state conditions. The analytical inductance calculation is carried out using Neumann's formula where the coils in the end winding with finite cross section are modeled by straight serially connected filaments. Field affecting...
Multi-phase machines are of increasing importance in today's electric drives and generation systems. While in three-phase machines stator leakage flux phenomena are usually described with a single parameter, a higher number of independent leakage inductances is required as the number of phases increases. The impact of leakage inductances on multi-phase machine performance, especially in PWM inverter-supplied...
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.
Balancing currents within parallel winding branches of large electric machines, caused by asymmetric winding or flux distributions, are determined for steady-state conditions by the use of the method of symmetrical components. Knowledge of these balancing currents is for example valuable with respect to the evaluation of the damping of the unbalanced electromagnetic pull, design optimization of machines...
Permanent magnet machines with windings concentrated around each tooth gain more and more importance. In this paper, the magnetomotive force of a three-phase winding with concentrated coils will be analysed. As an example, a machine with a two-coil zone width with opposing flux is regarded. It will be shown that there are two different winding alternatives with four different rotor pole numbers that...
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