Lecture12 - Stator Laminations & Core Design Studies
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Transcript of Lecture12 - Stator Laminations & Core Design Studies
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7/27/2019 Lecture12 - Stator Laminations & Core Design Studies
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Electric Machine Design Course
Stator Laminations & Core Design Studies
Lecture # 12
Mod 12 Copyright: JR Hendershot 2012 110
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Lamination cross section proportions
Mod 12 Copyright: JR Hendershot 2012 111
AC Induction:
Assume air gap circumference flux = 1.0 Tesla
All stator teeth carry total air-gap flux
Low pole numbers, max O.C. tooth flux = 1.7 THigh pole numbers, max O.C. tooth flux density = 1.4 T
Yoke flux based upon 0.5 pole flux, Max = 1.4 T
Reluctance Synchronous:
Assume air gap circumference flux = 1.0 TeslaStator teeth carry ~ 2/3 air-gap flux
Low pole numbers, max O.C. tooth flux = 1.7 T
High pole numbers, max O.C. tooth flux density = 1.4 T
Yoke flux based upon 0.5 pole flux, Max = 1.4 T
SPM or IPM Brushless:Determine air gap flux/pole from magnet design
Stator teeth over rotor pole span carry rotor pole flux
Low pole numbers, max O.C. tooth flux = 1.7 T
High pole numbers, max O.C. tooth flux density = 1.4 T
Yoke flux based upon 0.5 pole flux, Max = 1.4 T
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Mod 12 Copyright: JR Hendershot 2012 112
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Mod 12 Copyright: JR Hendershot 2012 113
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Punched core laminations
Mod 12 Copyright: JR Hendershot 2012 114
Rotor cores punched from
stator ID in progressive diereduces material cost.
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Yoke thickness of stator or rotor
Mod 12 Copyright: JR Hendershot 2012 115
Yoke thickness varies as the number of poles vs stator
OD & rotor ID for fixed stator slot depth & rotor OD
B = average air-gap flux densityBy= peak yoke flux density
D = rotor OD
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Mod 12 Copyright: JR Hendershot 2012 116
Flux density guidelines by two experts
Max flux density in stator yoke & teeth for ACM & RSM
For open circuit PMSM machines, 1.2T/1.4T in yoke &
1.4T/1.6T in teeth for max flux density. (JRH)
Position Typical flux
density range
(Say)
Maximum flux
density (Lipo)
Airgap Bg 0.65 0.82 T
(ave.)
Stator yoke 1.1 1.45 T (peak) 1.7 T
Stator teeth 1.4 1.7 T 2.1 T
Rotor yoke 1.2 T 1.7 T
Rotor teeth 1.5 1.8 T 2.2 T
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Air-Gap correction factor (Carter Coefficient)
Mod 12 Copyright: JR Hendershot 2012 117
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Rotor & Stator Laminations
Mod 12 Copyright: JR Hendershot 2012 118
Magnetic circuit
dimensions of
magnetic circuitoptimized for
flux densities
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Toyota Camry & Lexus stator lams
Mod 12 Copyright: JR Hendershot 2012 119
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Stacked & insulated stator cores
Mod 12 Copyright: JR Hendershot 2012 120
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Laminated stator cores
Mod 12 Copyright: JR Hendershot 2012 121
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Stator cores stacked from thin laminations
Mod 12 Copyright: JR Hendershot 2012 122
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Segmented stator design using either
laminated stacked teeth or Sintered teeth.
Mod 12 Copyright: JR Hendershot 2012 123
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Mod 12 Copyright: JR Hendershot 2012 124
Skewed rotor cores for AC motors
Mitsui High-tec
Die interlocking principle
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Large Turbo Generator Cores
Mod 12 Copyright: JR Hendershot 2012 125
Notice- Finger Plates on core end to prevent lamination vibration
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Stator cores for rail traction motors
Mod 12 Copyright: JR Hendershot 2012 126
End turn supports
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Finger Vent Plates
Mod 12 Copyright: JR Hendershot 2012 127
Finger Plates oncore ends prevent
lamination vibration
Vent plates in between axial groups of laminations
Fabricated by stamping and spot-welding
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Sintered magnetic
motor cores
Mod 12 Copyright: JR Hendershot 2012 128
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Unusual laminated machine cores
Mod 12 Copyright: JR Hendershot 2012 129
Stator/Rotor lam for PMSM-IPM
Slinky
stator core
Strip-wrap-up
Stator core
Axial flux stator
pole assembly
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Title
Mod 12 Copyright: JR Hendershot 2012 130
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Title
Mod 12 Copyright: JR Hendershot 2012 131