Star-delta starting of induction motor¶
This example will demonstrate a simulated star-delta start-up of a squirrel cage induction motor (model induction_machine_starting.engee). This example shows how to model a star-delta starting circuit for an induction machine. When power is connected to the machine via switch S1, switch S2 is initially off, causing the machine to be connected in a star circuit. As soon as the machine approaches synchronous speed, switch S2 is actuated, thereby reconnecting the machine in a delta configuration. The star-delta starting scheme for an induction motor provides low mains currents at start-up, and once the motor has reached the speed required for its operation, the switchover to delta switching takes place, allowing operation at 100% load without any problems.
General view of the models¶
Engee model:
Realisation of the model run using software control:¶
Loading the required libraries:
using Plots
gr();
using DataFrames
Loading the model:
model_name = "induction_machine_starting"
model_name in [m.name for m in engee.get_all_models()] ? engee.open(model_name) : engee.load( "$(@__DIR__)/$(model_name).engee");
Running a loaded model:
results = engee.run(model_name)
Read instantaneous load current and shaft speed data:
t = results["i_a"].time;
i_a = results["i_a"].value;
i_b = results["i_b"].value;
i_c = results["i_c"].value;
w = results["w"].value;
Loading and visualisation of simulation data¶
plot(t, [i_a i_b i_c], label=["Ток фазы А" "Ток фазы В" "Ток фазы С"])
plot!(ylabel = "Мгновенное значение тока, А", xlabel="Время, c")
plot(t, w, label="Скорость вращения вала")
plot!(ylabel = "Скорость вращения, об/мин", xlabel="Время, c")
Conclusions:¶
In this example, tools were used to command control an induction motor starting model. Simulation results were imported into a script, visualised, using interactive plots from the Plots library.