Setting Up Analysis Parameters for a Generic Rotating Machine

To define solution parameters for a generic rotating machine:

  1. Right-click Analysis in the project tree, and click Add Solution Setup.

    The Solution Setup dialog box appears.

  2. Click the General tab.

    1. If you wish to change the automatically assigned setup name, enter a name for the setup in the Setup Name field.
    2. The solution setup is enabled by default. Uncheck the Enabled box to disable the setup, if desired.
    3. Select an operation type (Motor, Generator, or Wind Generator) from the Operation Type drop-down menu. The Operation Type is set to Motor by default.

    4. Select the Load Type used in the machine.

      • If the Operation Type is Motor, select one of the following Load Type options:

        Const Speed

        The speed remains constant in the motor.

        Const Power

        The output power remains constant in the motor. (Default type.)

        Const Torque

        The torque remains constant regardless of the speed. In this case, Tload = Trated, given by the output power divided by the given rated speed.

        Linear Torque

        The torque increases linearly with speed. In this case, Tload = Trated * (n/nrated) where Trated is given by the output power divided by the given rated speed.

        Fan Load

        The load varies nonlinearly with speed. In this case, Tload = Trated * (n/nrated)2 where Trated is given by the output power divided by the given rated speed.

      • If the Operation Type is either Generator or Wind Generator, select one of the following Load Type options:

        Infinite Bus

        When the generator is connected to an infinite bus of the power system, the terminal voltages remain constant and the output power is determined by the output currents.

        Independent Generator

        The generator supplies electrical power to a load inductor. For an AC generator, the resistance and inductance of the load inductor are determined by the rated output power, the rated voltage, and the rated power factor. For a DC generator, the resistance of the load resistor is determined by the rated output power and the rated voltage.

    5. Enter the rated mechanical or electrical output (apparent) power in the Rated Output Power field.

      When the Operation Type is Generator and Source Type is AC, the property name changes to Rated Apparent Power (kVA), and the unit column is blank.

    6. Enter the applied or output rated voltage in the Rated Voltage field. (RMS value for AC source.) Default value is 208 V.
    7. Enter the temperature at which the system functions in the Operating Temperature field. Default is 75 cel.

  3. Click the Generic Rotating Machine (GRM) tab.

    1. For AC source type machines, enter the rated power factor in the Rated Power Factor field. The default value is 0.8. This field is invisible when the Source Type is DC.
    2. For AC source type machines, if you wish to determine load impedance when the phase current leads the phase voltage, enable the Capacitive Power Factor check box. This field is invisible when the Source Type is DC.
    3. Enter the source frequency in the Frequency field and select the appropriate unit of measure. The default value is 60 Hz. This field is invisible when the Source Type is DC.
    4. Optionally, you can click the Use Defaults button to restore the tab settings to default values.

  4. Optionally, click the Defaults tab. This tab contains two buttons:

    • Click the Save Defaults button to save the currently-defined settings as defaults for future setups.
    • Click the Revert to Standard Defaults button to clear existing user-defined defaults and revert to the standard settings.
  5. Click OK to close the Solution Setup window.

Related Topics 

Solution Data for Generic Rotating Machines