induction motor response not satisfying

Hello

as mentionned the response of the induction motor, its speed, isn't fully as it should be. it's not wrong bet needs adjustement and I don't know where is the problem.

The motor has to maintain constant speed under varrying torque

below is the torque profil which has been already interpolated and looks quite smoth

the response i need which is the speed that needs to be constant and undergoes variation when torque arises and decreases, which the motor achieved but looks unsmooth as shown in the plot below

what I'm not satisfied with are the semi-intervall in the plot below

if you can see between 19 and 20 the speed is constant and drops at 20 to be again constant between 20 and 21, what I would like to achieve is what I've drawn in blue, a smooth slope that goes through the middle of each semi-Intervall.

My input doesn't have these weird semi-Intervall so I'm not quite sure where it comes from

my 2 questions are the following:

• does it have anything to do with the solver? I used the same solver as in the example ''electric engine dyno''
• is it an interpolation problem?
• if there's no way to fix the simscape model, can it be reshaped any other way? like with a script or the signal toolbox?

thank you in advance

edit: the moving average block didn't worl for me

regards,

Answer 1

[Sulaymon Eshkabilov]

At 1st, the smoothed torque profile (curve) is not smooth enough, and it does show consideable rattling that need to be removed or smoothed. All issues are orginating from the torque profile (curve). 2nd, to removing the rattling effect in the torque profile, you cna employ moving average filter block - https://www.mathworks.com/help/dsp/ref/movingaverage.html

After taking these steps, most of the mentioned issues should be resolved.

[K]

Hello

thanks for you fast answer.

I guess the rattling in the torque are also permissible in my case since the input is an electrical load that goes through a synchronous generator which is connected to the motor via the R-Port

and this is the electrical load, connected to the generator, which was interpolated and doesn't have rattling since it's a 1D look up table with values

the values of the 1D table are measurment points each 30s and where interpolated to points each 10s (1 sample point in matlab=10s --> total of 90 sample point) and working with a finer interpolation would last so long

I guess it's a problem related to the interpolation right?

I will follow your advise and try to add the moving average after the 1D Table or before measuring the torque and speed

Do you advise better algorithm for the 1D Table? I choose this setting

Thanks again

Regards

[Sulaymon Eshkabilov]

Most welcome! Glad to be of some help. Great all the best.

[K]

Hello

sadly it didn't work in my case but thanks to you I got a new usefull block

I'll leave my question open in case anyone has other suggestions

regards