Results

Output voltage versus Prime Mover Speed 

a) Sub Synchronous Mode 

The Machine is said to be operated in sub Synchronous speed if its driving speed is lesser than its Rated speed. For a rated voltage of -300 V the machine is driven at sub synchronous speed. Figure 5.5 shows that for a DC input voltage of -300 V of a DC Motor having a prime mover speed of 1308 rpm and gives a 3 phase output RMS voltage of 196.544 Volts. Figure 5.6 shows that for a prime mover speed of 1308.7 rpm which is sub-synchronous speed, the output phase voltages has same Amplitude and a constant frequency of 50 Hz. 

b) Synchronous Mode. 

The Machine is said to be operated in Synchronous speed if its driving speed is equal to its Rated speed. For a rated voltage of -50 V the machine is driven at synchronous speed. Figure 5.7 shows that for a DC input voltage of -50 V of a DC Motor having a prime mover speed of 1448.77 rpm gives a 3 phase output RMS voltage of 196.544 Volts. Figure 5.8 shows that for a prime mover speed of 1448.77 rpm which is synchronous speed the output phase voltage has same Amplitude and a constant frequency of 50 Hz. 

c)Super-Synchronous Mode:

The Machine is said to be operated in Super-Synchronous speed if its driving speed is greater than its Rated speed. Figure 5.8 shows that for a DC input voltage of 500 V of a DC Motor having a prime mover speed of 1620.03 rpm gives a 3 phase output RMS voltage of 196.544 Volts. Figure 5.9 shows that for a prime mover speed of 1620 rpm which is Super-synchronous Speed the output voltage has same Amplitude and a constant frequency of 50 Hz 

Output voltage for different excitation voltage. 

a) Output Voltage for Excitation voltage of 100 V. 

Figure 5.10 shows that for a Excitation phase voltage of 100 V the output RMS voltage of 3 phase is shown 49.13 V. Figure 5.11 shows that for a Sinusoidal input phase voltage of 100 V. 

V=√ 2 /3 𝑉𝑝ℎ𝑎𝑠𝑒 

V=√ 2 /3 ∗ 100 

V= 81.6 V (Nominal Voltage) 

The RMS output voltage Observed 49.13 V having a frequency of 50 Hz with Amplitude. 

b) Output Voltage for Excitation voltage of 300 V. 

Figure 5.12 shows that for a Excitation phase voltage of 300 V the output RMS voltage of 3 phase is shown 147.443 V.

 V=√ 2 /3 𝑉𝑝ℎ𝑎𝑠𝑒 

V=√ 2 /3 ∗ 300 

V= 245 V (Nominal Voltage) 

Figure 5.13 shows that for a Sinusoidal input phase voltage of 300 V. The RMS output voltage Observed 147.443 V having a frequency of 50 Hz and same Amplitude. 

c) Output Voltage for Excitation voltage of 400 V. 

Figure 5.14 shows that for a Excitation phase voltage of 400 V the output RMS voltage of 3 phase is shown 196.544 V.

 V=√ 2 /3 𝑉𝑝ℎ𝑎𝑠𝑒 

V=√ 2 /3 ∗ 400 

V= 326.5 V (Nominal Voltage) 

Figure 5.15 shows that for a Sinusoidal input phase voltage of 400 V. The RMS output voltage Observed 196.544 V having a frequency of 50 Hz and same Amplitude.