IM_Squirrel Cage
Induction machine with squirrel cage rotor
Description
Connections
Parameters
Modelica Standard Library
The IM_Squirrel Cage (or IM Squirrel Cage) component models a three phase induction machine with a squirrel cage. The resistance and stray inductance of the stator is modeled directly in stator phases, then using space phasor transformation. The resistance and stray inductance of the rotor's squirrel cage is modeled in two axis of the rotor-fixed coordinate system. Both are connected together via a stator-fixed Air Gap model.
The following losses are modeled:
heat losses in the temperature dependent stator winding resistances
heat losses in the temperature dependent cage resistances
friction losses
core losses (only eddy current losses, no hysteresis losses)
stray load losses
Name
Modelica ID
flange
Shaft
plugsn
Negative stator plug
plug_sn
plugsp
Positive stator plug
plug_sp
support
Support at which the reaction torque is acting
thermalPort
General Parameters
Default
Units
fs,nom
50
Hz
Nominal frequency
fsNominal
Jr
0.29
kg⁢m2
Rotor moment of inertia
Js
J[r]
Stator moment of inertia
p
2
Number of pole pairs (Integer)
Tr,oper
293.15
K
Operational temperature of rotor resistance
TrOperational
Ts,oper
Operational temperature of stator resistance
TsOperational
Use Support Flange
false
True (checked) means enable stator support flange
useSupport
Use Thermal Port
True (checked) means thermal port is enabled
useThermalPort
Friction Losses
Pref
0
W
Reference friction losses
PRef
ωref
ωnom
rads
Reference angular velocity
wRef
pω
V
Exponent of friction
power_w
See Friction for details of the friction loss model.
Stator Core Losses
Reference rotor core losses
Vref
Reference RMS voltage
VRef
2⁢π⁢fs,nom
See Core for details of the core loss model.
Stray Load Losses
Iref
Ianom
Reference RMS current
IRef
1
Exponent of stray load loss
See Stray Load for details of the stray load loss model.
Nominal Resistances And Inductances Parameters
αr
1K
Temperature coefficient of rotor resistance at 20 degC
alpha20r
αs
Temperature coefficient of stator resistance at 20 degC
alpha20s
Lm
[1]
H
Main field inductance
Lrσ
Rotor stray inductance per phase
Lrsigma
Lsσ
Stator stray inductance per phase
Lssigma
Ls,0
Stator zero sequence inductance
Lszero
Rr
0.04
Ω
Warm rotor resistance per phase
Rs
0.03
Warm stator resistance per phase
Tr,ref
Reference temperature of rotor resistance
TrRef
Ts,ref
Reference temperature of stator resistance
TsRef
[1] 1.5⁢1−0.9333π⁢fs,nom
The component described in this topic is from the Modelica Standard Library. To view the original documentation, which includes author and copyright information, click here.
See Also
Electrical Library
Electrical Machines
Induction Machines
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