pmsm design
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PMSM Design
Liping Zheng
03/28/03
Winding Configuration
Round Wire Rectangular Wire
Four Possible Winding Configuration
AWG14 AWG13 Litz
rectangle
Litz
round
Dshaft(mm) 14 15.5 16 18
Dwire(mm) 1.71 1.913 1.78x2.27 2.21
R1(mm) 8.43 9.28 8.5 10.68
R2(mm) 9.89 10.9 10.83 12.64
Di(mm) 21.64 23.9 25.5 27.65
Do(mm) 34 36 38 40
Length(mm) 25.4 25.4 25.4 25.4
Wire SelectionSolid copper wire
AWG13(Do:75mil, R:2mΩ/ft)AWG14(Do:67mil,R:2.6mΩ/ft)
Litz wire(multi-strand configuration)RoundLitz WireRectangular
Benefit of using Litz-wireEasy shape.Reduce skin effect, proximity effect.Each strand tends to take all possible positions in the
cross-section of the entire conductor.
Airgap Flux and Leakage
Back EMF Difference Due to Leakage
Back EMF difference may cause big problem in Solid wire.
Rectangular Litz Wire Configuration
Dshaft 16mm
Lgap 0.5mm
R1 8.5mm
R2 10.83mm
Di 25.4mm
Do 36mm
a 1.78mm
b 2.27mm
Length of Stator: 25.4mm
Simulated Back EMF-Litz Rectangular Wire Configuration
Simulated Current-Litz Rectangular Wire Configuration
Simulation results for different PM Width(W)
Flux lines for different PM Width
W=6mm W=8mm W=10mm
W=12mm W=all
Shaft Structure
Further Work
Order the rectangular Litz-wire in advance.Optimize PM structure.Design Shaft structure.
Full stress analysis.
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