Abstract
This paper investigates the performance of Synchronous Reluctance Motors (SynRMs) when the stator is equipped with a combined star-delta winding layout. The conventional star winding is used as a benchmark in this study to compare different possible single layer winding layouts. Among these different winding layouts, those which maximize the fundamental MMF component are selected. A simple mathematical formula is then derived to calculate the equivalent winding factor for different shares between star and delta sub windings. It has been proved that for the same copper volume and line current magnitude, the star-delta connection can offer an enhancement in the torque density of approximately 5.2% over the conventional star case under rated conditions. However, this gain is affected by the employed number of poles and stator slots. On the other hand, the effect of the winding layout on either power factor or core loss can be merely neglected over a wide range of speeds and currents. Nevertheless, the machine efficiency under a combined star-delta connection is relatively improved under light loading as a result to the machine torque/current ratio enhancement. The theoretical findings are experimentally validated using two identical 5.5 kW prototype machines, having star and combined star-delta winding connections.
| Original language | English |
|---|---|
| Journal | IEEE Transactions on Energy Conversion |
| DOIs | |
| Publication status | Accepted/In press - 12 Dec 2017 |
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Keywords
- Coils
- Combined star-delta
- dual three-phase winding
- FEM
- Harmonic analysis
- Layout
- Stator windings
- Synchronous Reluctance Motor (SynRM)
- Torque
- Winding factor
- Windings
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering
Cite this
An Improved Torque Density Synchronous Reluctance Machine with a Combined Star-Delta Winding Layout. / Ibrahim, Mohamed Nabil Fathy; Abdel-Khalik, Ayman; Rashad, Essam Eddin M.; Sergeant, Peter.
In: IEEE Transactions on Energy Conversion, 12.12.2017.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - An Improved Torque Density Synchronous Reluctance Machine with a Combined Star-Delta Winding Layout
AU - Ibrahim, Mohamed Nabil Fathy
AU - Abdel-Khalik, Ayman
AU - Rashad, Essam Eddin M.
AU - Sergeant, Peter
PY - 2017/12/12
Y1 - 2017/12/12
N2 - This paper investigates the performance of Synchronous Reluctance Motors (SynRMs) when the stator is equipped with a combined star-delta winding layout. The conventional star winding is used as a benchmark in this study to compare different possible single layer winding layouts. Among these different winding layouts, those which maximize the fundamental MMF component are selected. A simple mathematical formula is then derived to calculate the equivalent winding factor for different shares between star and delta sub windings. It has been proved that for the same copper volume and line current magnitude, the star-delta connection can offer an enhancement in the torque density of approximately 5.2% over the conventional star case under rated conditions. However, this gain is affected by the employed number of poles and stator slots. On the other hand, the effect of the winding layout on either power factor or core loss can be merely neglected over a wide range of speeds and currents. Nevertheless, the machine efficiency under a combined star-delta connection is relatively improved under light loading as a result to the machine torque/current ratio enhancement. The theoretical findings are experimentally validated using two identical 5.5 kW prototype machines, having star and combined star-delta winding connections.
AB - This paper investigates the performance of Synchronous Reluctance Motors (SynRMs) when the stator is equipped with a combined star-delta winding layout. The conventional star winding is used as a benchmark in this study to compare different possible single layer winding layouts. Among these different winding layouts, those which maximize the fundamental MMF component are selected. A simple mathematical formula is then derived to calculate the equivalent winding factor for different shares between star and delta sub windings. It has been proved that for the same copper volume and line current magnitude, the star-delta connection can offer an enhancement in the torque density of approximately 5.2% over the conventional star case under rated conditions. However, this gain is affected by the employed number of poles and stator slots. On the other hand, the effect of the winding layout on either power factor or core loss can be merely neglected over a wide range of speeds and currents. Nevertheless, the machine efficiency under a combined star-delta connection is relatively improved under light loading as a result to the machine torque/current ratio enhancement. The theoretical findings are experimentally validated using two identical 5.5 kW prototype machines, having star and combined star-delta winding connections.
KW - Coils
KW - Combined star-delta
KW - dual three-phase winding
KW - FEM
KW - Harmonic analysis
KW - Layout
KW - Stator windings
KW - Synchronous Reluctance Motor (SynRM)
KW - Torque
KW - Winding factor
KW - Windings
UR - http://www.scopus.com/inward/record.url?scp=85038865188&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85038865188&partnerID=8YFLogxK
U2 - 10.1109/TEC.2017.2782777
DO - 10.1109/TEC.2017.2782777
M3 - Article
AN - SCOPUS:85038865188
JO - IEEE Transactions on Energy Conversion
JF - IEEE Transactions on Energy Conversion
SN - 0885-8969
ER -