Lamination
Laminations  Data
Here are the properties needed to define a new lamination:
Category  Label  Unit 
Description  Name  * 
Family  *  
Author  *  
Manufacturer  *  
Memo  *  
Economic  Price  USD/kg 
Mechanical data  Sheet thickness  mm 
Stacking factor  1  
Mass density  kg/m3  
Young modulus  N/m2  
Poisson ratio  1  
Magnetic data  Relative permeability  1 
Magnetic polarization at saturation Js  T  
Relative permeability  1  
Knee coefficient  1  
Iron Loss  Hysteresis loss coefficient (kh)  1 
Exponent of B for the hysteresis losses (αh)  1  
Exponent of f for the hysteresis losses (βh)  1  
Classical loss coefficient  Sine wave (kc x kαc)  1  
Classical loss coefficient  Any wave (kc)  1  
Exponent for the classical losses (αc)  1  
Excess loss coefficient  Sine wave (ke x kαe)  1  
Excess loss coefficient  Any wave (ke)  1  
Exponent of B for the excess losses (αe)  1  
Thermal data  Reference temperature  Tref  °C 
Thermal conductivity in the lamination direction at Tref  W/K/m  
Thermal conductivity in the lamination insulation at Tref  W/K/m  
Equivalent thermal conductivity in the lamination depth at Tref  W/K/m  
Specific heat at Tref  J/K/kg 
Note: The B(H) curve is defined with an analytical model given in
the Advanced section: Create a B(H) curve.
Note: A stacking factor is considered to define the B(H) curve to
analyze the behavior of the magnetic circuit of the machine.
The user must define the magnetic characteristics of the solid material while the magnetic characteristics of the lamination stack are automatically deduced considering the value of the stacking factor.
See Advanced section: Create a B(H) curve.
Note: Electric properties are defined via iron loss model.
Note: Iron losses are defined with an analytical model given in
Advanced section: Define iron loss parameters.
Note: The thermal conductivity “in depth” along the stacking
direction: K _{d} is computed as follows:
S _{f}  Stacking factor 
K _{ins}  Thermal conductivity of the lamination insulation 
K _{lam}  Thermal conductivity in the lamination 

Note: The thermal conductivity of laminated regions is constant
whatever is the temperature of the region.