Simulation of Prime Mover – Separately Excited DC Motor: 

Figure 5.1 shows the Dymola Circuit of Prime Mover. Here Sep. Excited DC motor is used as a Prime mover. In the Dymola circuit, the Separately Excited DC Motor is excited by excitation voltage of 100 V and armature voltage depends on the speed at which prime mover should operate. For the desired speed of prime mover, the power supply to the Armature is varied by varying the armature DC Voltage. Speed is a function of Armature voltage. The voltage and current of armature and excitation is measured by voltage sensor and current sensor connected in the circuit. The mechanical rotating shaft gives the speed which is then connected to the BWIG shaft, which will be a driving speed for BWIG generator. 

The Characteristics of the Separately Excited DC machine:

Figure 5.2 shows the Speed time characteristics of Separately Excited DC Motor. Where the speed of the motor starts at time equal to 0 Seconds, then the speed of the Motor increase at transient position then after sub transient finally it reaches a Steady State position where at steady state its speed is around 1450.77 Turn_mn (rad per Sec). Figure 5.3 shows the armature current and speed characteristics. Where it can be observed that the Armature current drops for an Increase in Speed of prime mover.