The Squirrel Cage Induction Machine can be operated in either 'speed control' or 'torque control' modes. In speed control mode, the machine rotates at the speed specified at the input W. In torque control mode, the speed is calculated based on the 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.
More: |
Interfacing to the Multi-Mass Torsional Shaft |
Motor Name |
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Text |
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Just an identifier. A name should be entered here to avoid compilation warnings |
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Data Generation/ Entry |
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Choice |
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Enter Typical, Explicit or EMTP Type 40 data entry format. See Data Generation/Entry for more details |
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Multi-mass Interface |
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Choice |
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Select Enable or Disable. See Interfacing to the Multi-Mass Torsional Shaft for more details |
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Number of Coherent Machines |
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REAL |
Literal |
Enter the number of machines acting coherently. See Coherent Machines for more details |
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Number of Sub-Iteration Steps |
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INTEGER |
Constant |
Enter a number to specify the number of sub-iterations per main time step. Increase this number if you have convergence problems. The default value of 1 is normally adequate |
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Rated RMS Phase Voltage |
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REAL |
Constant |
Enter the line-to-neutral, RMS rated voltage of the machine [kV] |
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Rated RMS Phase Current |
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REAL |
Constant |
Enter the RMS rated line current of the machine [kA] |
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Base Angular Frequency |
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REAL |
Constant |
Enter the machine base angular frequency [rad/s] |
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Graphics Display |
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Choice |
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Select 3-Phase View or Single Line View |
Data from a machine whose horse power is |
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REAL |
Constant |
Enter the horse power of a machine. Per-unit data from a library should be selected typical to a machine of the size specified [hp] |
Typical Data Used:
500 HP Machine, 4.16 kV, 4-Pole |
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Parameter |
Value |
Stator resistance | 0.066 |
Stator leakage reactance |
0.046 |
Mutual reactance | 3.86 |
Rotor mutual reactance | 0.122 |
Second cage unsaturated reactance |
0.105 |
First cage resistance | 0.298 |
Second cage resistance |
0.018 |
Damping | 0.008 |
J | 200/WRATED |
1000 HP Machine, 4.16 kV, 4-Pole |
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Parameter |
Value |
Stator resistance |
0.015 |
Stator leakage reactance |
0.091 |
Mutual reactance |
6.319 |
Rotor mutual reactance |
0.1418 |
Second cage unsaturated reactance |
0.0539 |
First cage resistance |
0.0507 |
Second cage resistance |
0.0095 |
Damping | 0.0062 |
J | 373.3/WRATED |
1.5 HP Machine, 208 V, 6-Pole |
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Parameter |
Value |
Stator resistance |
0.0767 |
Stator leakage reactance |
0.0799 |
Mutual reactance |
1.917 |
Rotor mutual reactance |
0.171 |
Second cage unsaturated reactance |
0.424 |
First cage resistance |
0.071 |
Second cage resistance |
0.311 |
Damping | 0.01 |
J |
136/WRATED |
Mutual Saturation |
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Choice |
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Select Enabled or Disabled. See Magnetizing (main) Saturation Curve for more details |
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Leakage Saturation |
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Choice |
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Select Enabled or Disabled. See Leakage Saturation Curve for more details |
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Stator Resistance |
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REAL |
Constant |
Enter the stator winding resistance [pu] |
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First Cage Resistance |
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REAL |
Constant |
Enter the 1st rotor cage resistance [pu] |
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Second Cage Resistance |
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REAL |
Constant |
Enter the 2nd rotor cage resistance [pu] |
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Stator Unsaturated Leakage Reactance |
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REAL |
Constant |
Enter the stator leakage reactance [pu] |
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Unsaturated Magnetizing Reactance |
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REAL |
Constant |
Enter the stator main reactance [pu] |
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Rotor Unsaturated Mutual Reactance |
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REAL |
Constant |
Enter the mutual reactance between the two rotor cages [pu] |
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Second Cage Unsaturated Reactance |
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REAL |
Constant |
Enter the second cage leakage reactance [pu] |
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Polar Moment of Inertia (J=2H) |
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REAL |
Constant |
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Mechanical Damping |
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REAL |
Constant |
Enter the mechanical damping to compensate for friction and windage loss [pu] |
Design Ratio |
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REAL |
Constant |
The reactance/resistance values of the two rotor cages are derived based from this ratio [pu] |
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Power Factor at Rated Load |
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REAL |
Constant |
Enter the power factor at rated load [pu] |
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Efficiency at Rated Load |
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REAL |
Constant |
Enter the efficiency at rated load [pu] |
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Slip at Full Load |
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REAL |
Constant |
Enter the slip at full load [pu] |
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Minimum Extinction Time |
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REAL |
Constant |
Enter the power factor at rated load [pu] |
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Starting Current at Full Volts |
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REAL |
Constant |
Enter the starting current at full volts [pu] |
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Starting Torque at Full Volt / Full Load Torque |
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REAL |
Constant |
Enter the starting full load torque [pu] |
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Maximum Torque / Full Load Torque |
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REAL |
Constant |
Enter the maximum full load torque [pu] |
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Number of Poles |
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INTEGER |
Constant |
Enter the number of stator poles |
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Polar Moment of Inertia (J) |
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REAL |
Constant |
The units are [kgm2] or [MWs/MVA] depending on Units of the Inertia below. |
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Units of the Inertia |
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Choice |
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Select either kgm2 or s. |
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Mechanical Damping |
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REAL |
Constant |
Enter the mechanical damping to compensate for friction and windage loss [pu] |
Magnetizing (main) Saturation Curve
NOTE: These properties are only enabled if Data Generation/Entry is set to Explicit and Mutual Saturation is set to Enabled. See Magnetizing (main) Saturation Curve for more details on setting these properties.
Point # - Magnetizing Current |
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REAL |
Constant |
Enter the current points of the magnetizing curve [pu] |
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Point # - Magnetizing Voltage |
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REAL |
Constant |
Enter the voltage points of the magnetizing curve [pu] |
NOTE: These properties are only enabled if Data Generation/Entry is set to Explicit and Leakage Saturation is set to Enabled. See Leakage Saturation Curve for more details on setting these properties.
Point # - Short Circuit Current |
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REAL |
Constant |
Enter the current points of the leakage saturation curve [pu] |
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Point # - Short Circuit Voltage |
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REAL |
Constant |
Enter the voltage points of the leakage saturation curve [pu] |
Name for Real Power (+=in) (pu) |
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REAL |
Output |
Enter a name for machine real power [pu] |
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Name for Reactive Power (+=in) (pu) |
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REAL |
Output |
Enter a name for machine reactive power [pu] |
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Name for Output Rotor Angle (rad) |
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REAL |
Output |
Enter a name for rotor angle [rad] |
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Name for Output Mechanical Torque (pu) |
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REAL |
Output |
Enter a name for mechanical torque [pu] |
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Name for Output Speed (pu) |
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REAL |
Output |
Enter a name for output speed [pu] |
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Name for Electrical Torque (pu) |
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REAL |
Output |
Enter a name for electrical torque [pu] |
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Name for Torque Angle (rad) |
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REAL |
Output |
Enter a name for the machine torque angle [rad] |
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Name for Slip Angle (rad) |
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REAL |
Output |
Enter a name for the machine slip angle [rad] |
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Name for Mutual Saturation Factor |
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REAL |
Output |
Enter a name for the machine mutual saturation factor |
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Name for Leakage Saturation Factor |
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REAL |
Output |
Enter a name for Leakage Saturation Factor |