Electrotechnical Systems

252 Electrotechnical Systems

systems of the three-phase voltages are formed; in addition, there is the opportunity

to make the additional phase shift Δ for the second system.

If the simulation is carried out with Δ = 0, the torque shown in Figure 5.81b is received.

The pulsation can be seen with the frequency of 300 Hz. If an additional phase shift of

30° is set (additional delay is 0.02/12 s) for the voltage of the second system, the torque

response shown in Figure 5.81c is obtained. The torque pulsation reduces drastically; its

frequency is 600 Hz. So indeed, during the supply of windings from the voltages with the

mutual phase displacement ...