ETAS ES5340.2, User Manual, Page: 60 / 120

ES5340.2 Electric Drive Simulation Board - User’s Guide 60
FPGA Models ETAS
IM Model
The parameterization of the induction machine is done by using typical values
like pole pair number or temperature coefficient. Other values like resistances,
inductivities and temperature are changeable during runtime. This allows for a
very accurate simulation of phase currents and electrical torque.
Mechanical Model
For the mechanical connection to the drive train, the spring-damper system is
also simulated inside the model. The parameterization of the mechanical model
is done by using typical values like friction coefficient, inertias for rotor and load,
torsional stiffness and damping. The load torque of the drive train can be
changed by the user during runtime.
4.2.1 Inverter – Parameters, Inputs and Outputs
Parameters
Tab. 4-10 Parameters of the inverter model
Parameter [unit] Description Value range Default
value
Gate Signal
Polarity "High Active": Conducting
when gate is "High"
"Low Active": Conducting
when gate is "Low" Low Active,
High Active High Active
U_SW_Fwd [V] Forward voltage across
switch in conductive state
(20 °C, 68 °F) 0.0 - 3.0 0.7
U_D_Fwd [V] Forward voltage across free-
wheeling diode in conductive
state (20 °C, 68 °F) 0.0 - 3.0 0.7
T_Switch [s] Switching time 0.0000002 -
0.000001 0.0000005
a_Inv [1/K] Temperature coefficient of
the ohmic resistance of the
inverter 0.0 - 0.01 0.00393
R_Batt [
Ω
] Internal resistance of battery 0.01 - 10.0 0.5
C_DC [mF] Capacitance of intermediate
circuit 0.01 - 10.0 0.5