Geometrical and electrical optimization of stator slots in electrical machines with combined wye-delta winding

Moros, Oleg; Gerling, Dieter

doi:10.1109/icelmach.2014.6960463

Cited by 12 publications

(10 citation statements)

References 3 publications

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“…While three-phase winding and six-phase winding have spread factors as 0.827 and 0.955, respectively (Misir et al, 2017), the delta-star winding has a spreading factor of 0.987, which is almost equal to that of a 12-phase winding; it gives higher output power and also improves the waveform of magnetomotive force, thereby reducing harmonics. In order to avoid circulating currents in APW, electromotive forces induced in the delta and star windings need to be at the ratio of 1.732:1 (Moros and Gerling, 2014). Figure 1 shows the two stator winding connections of BDFIM.…”

Section: Design Of Bdfimmentioning

confidence: 99%

“…Zhang et al (2018) developed a new hardware of rotor named hybrid rotor for BDFIM to reduce harmonic distortion compared to radial magnetic barrier rotor. Moros and Gerling (2014) carried out the optimization of electrical machine with wye-delta winding to reduce ohmic resistance, saving in conductor material and even heat distribution without causing any negative impact on the machine. In Kumaresan and Subbiah (2003), squirrel cage induction generator with delta-star winding is proposed for wind turbine generator to enhance the generation of real power and reduce consumption of reactive power.…”

Section: Introductionmentioning

confidence: 99%

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Design and implementation of brushless doubly fed induction machine with new stator winding configuration

et al. 2019

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Brushless doubly fed induction machine has acquired relevance as a wind electric generator because of its relative merits over doubly fed induction generator. However, the main drawback of brushless doubly fed induction machine is the presence of torque ripples due to spatial and time harmonics caused by two stator windings and complex rotor structure. In this article, a special design of brushless doubly fed induction machine using delta-star connection in one of the two stator windings is proposed to reduce the torque ripples. Simulation of the new brushless doubly fed induction machine design is performed in ANSYS Maxwell software, and the results when compared with the conventional winding design validated the effectiveness of the new design in minimizing the torque ripples. Prototype of the new brushless doubly fed induction machine has been fabricated and tested in laboratory. Tests have been conducted in both synchronous and asynchronous modes of brushless doubly fed induction machine. Simple induction and cascade connections have been tested in asynchronous motoring mode. Motoring as well as generating conditions have been tested in synchronous mode. Test results show that the new brushless doubly fed induction machine has not only the desired characteristics for wind turbine generator but also capabilities suited for variable torque–variable speed motor applications as well as constant speed applications.

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Section: Design Of Bdfimmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and implementation of brushless doubly fed induction machine with new stator winding configuration

et al. 2019

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“…Therefore, since the motor runs idle along with this time interval, an additional amount of stator current will be necessary to accelerate the rotor and compensate for the loss of its kinetic energy [21], which represents a part of the total switching current. Thus, since this part of the switching current does not depend on the form of delta connection, for the same load condition of a given motor, the reason for the common connection to give a total switching current with a higher amplitude relies on the residual magnetic field of the magnetic circuit of the motor.…”

Section: Introductionmentioning

confidence: 99%

Experimental Comparison of Preferential vs. Common Delta Connections for the Star-Delta Starting of Induction Motors

Itajiba

Varnier²,

Cabral

et al. 2021

Energies

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Although this is a fact that is not very explored in the literature, there are two possible forms to connect the stator winding of an induction motor in the delta. The choice for one of these forms defines the amplitude of the stator transient current during the switching from star to delta connection when the motor is driven by a star-delta starting system, which is the most widely used and diffused method for starting an induction motor. One of the possible forms of the delta connection gives rise to a switching current with a relatively small amplitude, which gives it the denomination of preferential. The other form has a relatively higher amplitude of switching current, but it is the most recommended and indicated in diagrams of catalogues and motor plates. Therefore, it is here called “common”. With the aim of evidencing how the differences between these two forms of delta connection are manifested, this paper approaches the issue experimentally, through a methodology with statistical support, for a better characterization of the performance of each of these forms of delta connection, in the case of the widely popular star-delta starting method.

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“…To reduce or eliminate the undesirable impacts of the magnetomotive force (MMF) harmonics on alternative current (AC) machines, a series of alternative solutions such as multi-layer windings [7][8][9][10][11], dual stator constructions or dual-layer windings [7,12], hybrid star-delta connections [13,14], flux repeller (conductive solid bar that reduces the leakage flux) in the rotor/stator slot openings [15], different numbers of turns per coil side [16], and the recently investigated 2 slot-pitch fractional winding topologies [7,17,18] were developed.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of Advanced Nonoverlapping Winding Induction Machines for EV/HEV Applications

2021

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This paper presents a detailed analysis and design guidelines for advanced nonoverlapping winding induction machines (AIMs) with coil-pitch of two slot-pitches by considering some vital empirical rules and flux-weakening characteristics. The aim of the study is to develop a type of new winding and stator topology for induction machines (IMs) that will lead to a decrease in total axial length without sacrificing torque, power, and efficiency. The key performance characteristics of the improved AIMs are investigated by 2D time-stepping finite element analysis (FEA) and compared with those of IMs having fractional and conventional overlapping and nonoverlapping windings. Compared with the conventional overlapping winding counterpart of the AIM, a ~25% shorter axial length without sacrificing torque, output power, and efficiency is achieved. In addition, the influences of major design parameters, such as stator slot, rotor slot and pole numbers, stack length, number of turns per phase, machine geometric parameters, etc., on the flux-weakening characteristics are investigated. It has been concluded that the major design parameters have a considerable effect on the electromagnetic performance. However, among those parameters, the influences of pole number and stack length together with the number of turns on flux-weakening characteristics are significant.

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Geometrical and electrical optimization of stator slots in electrical machines with combined wye-delta winding

Cited by 12 publications

References 3 publications

Design and implementation of brushless doubly fed induction machine with new stator winding configuration

Design and implementation of brushless doubly fed induction machine with new stator winding configuration

Experimental Comparison of Preferential vs. Common Delta Connections for the Star-Delta Starting of Induction Motors

Design and Analysis of Advanced Nonoverlapping Winding Induction Machines for EV/HEV Applications

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