Setting Up Analysis Parameters for a Three-Phase Synchronous Machine

To define the solution data:

  1. To open the Solution Setup window, right-click Analysis in the Project Manager tree, and click Add Solution Setup.
  2. Click the General tab.
  3. Select Motor or Generator from the Operation Type drop-down list.
  4. Select the Load Type used in the motor from the following 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.

    Const Speed

    For Motors. The speed remains constant in the motor.

    Const Power

    For Motors. The output power remains constant in the motor.

    Const Torque

    For Motors. 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

    For Motors. 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

    For Motors. 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.

  5. Enter the output power developed at the shaft of the machine in the Rated Output Power field.
  6. Enter the RMS line-to-line voltage in the Rated Voltage field.
  7. Enter the desired output speed of the motor at the load point in the Rated Speed field.
  8. Enter the temperature at which the system functions in the Operating Temperature field.
  9. Click the Three-Phase Synchronous Machine tab.
  10. Enter a value in the Rated Power Factor field.
  11. Select Wye or Delta from the Winding Connection drop-down menu.
  12. In the Exciter Efficiency field, enter the efficiency of the exciter used to supply the rotor winding with DC current if it is mechanically connected to the shaft of the generator. The efficiency value ranges between 0 and 1 and will only affect the total efficiency result.
  13. To enter an Input Exciting Current, select the check box, enter a value, and select the units.
  14. Click OK to close the Solution Setup window.

Related Topics 

Solution Data for Three-Phase Synchronous Machines