Felderregerkurven von Wechselstrom-Ankerwicklungen und Durchflutungsvielecke

The use of slightly asymmetrical windings for rotating electrical machines

“…Tingley's scheme is a useful tool that has been historically adopted to determine the distribution and the properties of a symmetrical m-phase, single/double-layer winding through the N slots of electrical rotating machines. 5,20,21 This procedure, even if not widely found in the scientific literature, is a useful alternative toward the traditional construction of the emf stars, and brings great advantages such as simplifying and automating the overall design procedure of the winding distribution along the stator periphery. For the construction of Tingley's scheme, the following parameters have to be considered:…”

“…In fact, asymmetrical windings have been historically adopted only in Θ ν , Maximum value of the νth of the magnetomotive force (MMF) harmonic; k slν′ , Slot opening factor for the ν′'th harmonic order; k dν′ , Direct sequence winding factor for the ν 'th harmonic order; w c , Number of turns per coil; l y , Number of winding layers; a, Number of winding parallel paths; I μ , Magnetizing current; ν, Order of the harmonic; T xn , Overall cogging torque harmonic content; α, Angular position of the rotor; σ, Maxwell stress tensor; μ 0 , Vacuum magnetic permeability; A x , Overall MMF harmonic content 3-phase, pole-changing IMs with speed ratios equal to 2:3, 1 4:6, 2 and so on, in machines with pole amplitude modulation, 3 or when the use of the same stator laminates for more slot/pole number combinations 4 was required and in the case of rewinding an old machine for a new synchronous speed. 2,4,5 However, the adoption of slightly asymmetrical windings can also be an interesting choice during the design stage of electrical machines. As demonstrated in this work, the use of this type of winding configuration in several case studies can even provide benefits and advantages if compared with symmetrical topologies.…”

Assisted software design of a wide variety of windings in rotating electrical machinery

“…As demonstrated in [21], [22] it is possible to design windings of electrical machines without the aid of a slot star nor of a slot plan (winding scheme), but simply through formulas. These formulas are derived by applying the "generic slot star" as defined in [21], [23] and can be used to form a generic m x ly . N 1m (or, equivalently, m x ly .…”

“…The general task to determine the l v -layer winding con nections, i.e. the previously defined connection matrix, of a machine with N slots, 2p poles and m phases can be carried out by the following procedure proposed in [21], [24] and here briefly described: 1) determination of the GCD between Nand p (t); 2) calculation of the number of slots containing phase coil sides with the same current (e.mJ.) orientation then a symmetrical winding can be designed I ;…”

“…"( positive coil sides slots of the first phase (phase 1) are located in the slots numbered according to the particular sequence defined in [21]; The numbering of "( slots belonging to the positive coil sides relative to the second phase con be found by adding the term Y 2 to the coil numbers of the first phase (phase 1); The numbering of "( slots belonging to the positive coil sides relative to the m-th phase con be found by adding the term Ym to the coil numbers of the first phase (phase 1); lO) the numbering of the slots containing the negative coil sides is defined by adding the terms Y( _ ) to the ones containing the positive coil sides.…”