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Squirrel Cage Induction Machine
Description
Input Parameters
Description
The Squirrel Cage Induction Machine can be operated in either 'speed control' or 'torque control' modes. In speed controlmode, the machine rotates at the speed specified at the input W. In torque control mode, the speed is calculated based onthe machine inertia, damping, the input torque and the output torque.
Normally, the machine is started in speed control mode with the W input set to rated per-unit speed (say 0.98) and then
switched over to torque control after the initial transients of the machine die out (i.e. reaches steady-state). This
component may also be used with the Multi-Mass Torsional Shaft Interface.
For more details on basic machine simulation theory, see Introduction to Machines.
Input Parameters
Configuration
More: Data Generation/EntryInterfacing to the Multi-Mass Torsional ShaftTerminal DescriptionsCoherent MachinesMagnetizing (main) Saturation Curve
Leakage Saturation CurveSquirrel-Cage Induction Motor
Motor
NameText
Just an identifier. A name should be entered here to avoid compilation
warnings
Data
Generation/Entry
Drop ListEnter Typical, Explicit or EMTP Type 40 data entry format. SeeData Generation/Entry for more details
Multi-massInterface
Drop ListSelect Enable or Disable. See Interfacing to the Multi-Mass TorsionalShaft for more details
Number ofCoherent
Machines
REAL VariableEnter the number of machines acting coherently. See CoherentMachines for more details
Number ofSub-
Iteration
Steps
INTEGER ConstantEnter a number to specify the number of sub-iterations per main timestep. Increase this number if you have convergence problems. Thedefault value of 1 is normally adequate
Rated RMS
PhaseVoltage
REAL Constant Enter the line-to-neutral, RMS rated voltage of the machine [kV]
Rated RMSPhase
REAL Constant Enter the RMS rated line current of the machine [kA]
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Typical Data Format
Explicit Data Format
EMTP Type 40 Format
Current
BaseAngular
Frequency
REAL Constant Enter the machine base angular frequency [rad/s]
GraphicsDisplay
Drop List Select 3-Phase View or Single Line View
HorsePower
REAL ConstantEnter the machine rated horse power if Data Generation/ Entry is selectedas 'Typical' only (1 HP = 0.746 kW)
MutualSaturation
DropList
Select Enabled or Disabled. See Magnetizing (main) Saturation Curvefor more details
LeakageSaturation
DropList
Select Enabled or Disabled. See Leakage Saturation Curve for moredetails
StatorResistance
REAL Constant Enter the stator winding resistance [pu]
First CageResistance
REAL Constant Enter the 1st rotor cage resistance [pu]
SecondCage
ResistanceREAL Constant Enter the 2nd rotor cage resistance [pu]
StatorUnsaturated
LeakageReactance
REAL Constant Enter the stator leakage reactance [pu]
UnsaturatedMagnetizingReactance
REAL Constant Enter the stator main reactance [pu]
RotorUnsaturated
MutualReactance
REAL Constant Enter the mutual reactance between the two rotor cages [pu]
SecondCage
Unsaturated
Reactance
REAL Constant Enter the second cage leakage reactance [pu]
Polar
Moment of
Inertia(J=2H)
REAL Constant
MechanicalDamping
REAL ConstantEnter the mechanical damping to compensate for friction and windageloss [pu]
Design
RatioREAL Constant
The reactance/resistance values of the two rotor cages are derived
based from this ratio [pu]
Power
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Magnetizing (main) Saturation Curve
Leakage Saturation Curve
Factor atRatedLoad
REAL Constant Enter the power factor at rated load [pu]
Efficiencyat Rated
LoadREAL Constant Enter the efficiency at rated load [pu]
Slip at Full
Load
REAL Constant Enter the slip at full load [pu]
MinimumExtinction
TimeREAL Constant Enter the power factor at rated load [pu]
StartingCurrent at
Full Volts
REAL Constant Enter the starting current at full volts [pu]
Starting
Torque atFull Volt /Full Load
Torque
REAL Constant Enter the starting full load torque [pu]
MaximumTorque /Full Load
Torque
REAL Constant Enter the maximum full load torque [pu]
Number ofPoles
INTEGER Constant Enter the number of stator poles
PolarMoment ofInertia (J)
REAL Constant The units are [kgm2] or [MWs/MVA] depending on Units of the
Inertia below.
Units ofthe Inertia
REAL Constant Select either kgm2
or MWs/MVA
MechanicalDamping
REAL Constant Enter the mechanical damping to compensate for friction and windageloss [pu]
NOTE: These properties are only enabled ifData Generation/Entry is set to Explicit and Mutual Saturation isset to Enabled. See Magnetizing (main) Saturation Curve for more details on setting these properties.
MagnetizingCurrentPoint 1
REAL Constant First current point of the magnetizing curve [pu]
MagnetizingVoltagePoint 1
REAL Constant First voltage point of the magnetizing curve [pu]
(I, V) Point#
REAL Constant Enter the remaining points for magnetizing curve of the machine [pu]
NOTE: These properties are only enabled ifData Generation/Entry is set to Explicit and Leakage Saturation
is set to Enabled. See Leakage Saturation Curve for more details on setting these properties.
ShortCircuit
CurrentREAL Constant First current point of the leakage saturation curve [pu]
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Internal Output Variables
Point 1
ShortCircuit
VoltagePoint 1
REAL Constant First voltage point of the leakage saturation curve [pu]
(I, V)Point #
REAL ConstantEnter the remaining points for leakage saturation curve of the machine[pu]
Name forReal
Power(+=in)
(pu)
REAL Output Enter a name for machine real power [pu]
Name forReactive
Power(+=in)
(pu)
REAL Output Enter a name for machine reactive power [pu]
Name forOutputRotorAngle(rad)
REAL Output Enter a name for rotor angle [rad]
Name forOutput
MechanicalTorque
(pu)
REAL Output Enter a name for mechanical torque [pu]
Name forOutputSpeed
(pu)
REAL Output Enter a name for output speed [pu]
Name forElectrical
Torque(pu)
REAL Output Enter a name for electrical torque [pu]
Name forTorque
Angle(rad)
REAL Output Enter a name for the machine torque angle [rad]
Name forSlip Angle
(rad)REAL Output Enter a name for the machine slip angle [rad]
Name forMutualSaturation
Factor
REAL Output Enter a name for the machine mutual saturation factor
Name forLeakage
Saturation
Factor
REAL Output Enter a name for Leakage Saturation Factor
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