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This paper reports on the study of winding asymmetries in small synchronous generators. These types of generator are commonly used in diesel generator or back-up systems and are usually no more than a few or few tens of kilowatts with two, four or six salient poles. The 3-phase winding is 120 deg pitched but often lap windings are not used, rather a hybrid of concentric winding and double layering...
In this paper the parameters of an axial-flux induction machine are determined. The parameters are part of equations describing the dynamic of the machine and hence required to develop a dynamic model based on the winding function theory. This theory is widely used to simulate faults in different radial-flux machines. Former articles all dealing just with radial-flux machines. Here the theory for...
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...
Permeability coefficient of nested cage rotor used in brushless doubly-fed machine is studied in this paper, and on the basis of it, function of a single coil inductance coefficient is presented. By accumulating all coils' inductance which takes distribution coefficient into account, a whole phase stator winding inductance is calculated.
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...
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 paper deals with the derivation of the inductances of permanent magnet synchronous machines equipped by distributed windings and those equipped by concentrated ones. A special attention is paid for the determination of the leakage inductances. A case study is considered where the stator magnetic circuit has the same geometrical parameters for both machines. The calculated inductances are compared...
Permanent magnet (PM) brushless machines equipped with fractional-slot concentrated-windings (FSCW) have been receiving considerable attention over the past few years, due to the fact that they have short end-windings, a high slot fill factor, a high efficiency and power density, and good flux- weakening and fault-tolerance capabilities. A key design parameter for such machines is the phase winding...
We have proposed a flat type of the superconducting fault current limiter (FCL) which is a modified version of a magnetic shielding type of the fault current limiter. The flat type FCL basically consists of a pancake coil and doughnut-like form high Tc superconductor (HTS) disk, each of which works as a primary winding and a secondary one-turn winding, respectively. In order to clarify the static...
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