A new project is set-up in tuto2_test_proj07 by copy/paste tuto2_test_proj06.
The following parameters are modified for variable speed operation
Input.Simu.type_varspeed = 2;
Input.Simu.Nspeeds= 100;
Input.Simu.type_control = 1;The last parameter specifies how the voltage is varied during variable speed: here, it linearly increases with speed until the field weakening speed above which it is constant.
With the GUI, all these parameters are gathered in Workflow/Variable Speed:
- Variable speed simulation setup with the GUI (constant flux)
You need to select "variable speed simulation" to enter the control law. The corresponding one is "Constant flux curve". You can leave the default values for EFmax and Umax.
Result Interpretation
The simulation time is now longer.
The variable speed sonogram can be displayed with plot_VS_ASPL_spectrogram
- Variable speed PWM acoustic noise spectrogram of an induction machine
One can see the "V-shape" excitation of the PWM force harmonics around 5kHz.
To check the control law that has been applied during the run-up one can plot the fundamental phase voltage and current with
>> plot_VS_var('U0rms')
>> plot_VS_var('I10rms')
- Evolution of I10rms
- Evolution of U0rms
