Motor Control Design with MATLAB and Simulin
hi everyone could you explain to me why the three phase voltages in this video are not sinusoïdale and how to change them To be sinusoidale?
Youtube video: Motor Control Design with MATLAB and Simulink
link:https://www.youtube.com/watchv=lP4jbmthiyc&t=1103s&ab_channel=MATLAB
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The three phase voltages in the models are fairly sinusoidal. Are you talking about the sampling resolution ? Control algorithms are implemented in a fixed sample rate and so are the output three phase voltages.
Do you mean this video? https://www.youtube.com/watch?v=lP4jbmthiyc
First of all i would like to thank you so much for your reply, yes sir exactactly i mean that video https://www.youtube.com/watch?v=lP4jbmthiyc&t=1103s&ab_channel=MATLAB
the reason why i'm asking this is that when i plot the three phase-voltages that's what i observe (pleach check the attachements) and and for my project i need to replace the ideal phase voltage generator here by a SVPWM algorithm (i need to implement an inverter and a battery instead) could u give me some hints how to use these sampled signals in order to implement the svpwm ? because it seems like they use continuous sinusoidale signals for that..
Thank you in advance !
There is no "continuous signals" in a simulation environment because it is not the analog world. Signals in Simulink are always sampled either at a fixed time step or variable time step. SVPWM does not require the input voltage waveforms to be "continuous". Please check various demos that we shipped in Simscape Electrical for the implementation of SVPWM. For example, this one: https://www.mathworks.com/help/releases/R2021a/physmod/sps/ug/ipmsm-velocity-control.html
Dear Mr.Dakai
Can the technique used in the matlab example "IPMSM velocity control" be applied in the simulink model "flux weakening control of pmsm", using this block "pwm generator (thee-phase, two level)" to generate the gate pulses. please see the attachments how I did it. If not, could you recommend me some corrections?
because i still have an unstable torque response even after tuning the current loop pid controllers.
Hi, The unstable response could be caused by different reasons. the PWM Generator block should work. Unfortunately I am not able to help you debug by just looking at your waveforms.
Dear Mr Dakai
Here I uplod the simulink file would you please help me debug ?
Thank you in advance.
Hi Wafa,
I made two changes to fix your model.
1. Change Param_BaseSpeed from 6500 to the original 876 rpm.
2. The PWM Generator block will have to be sampled at a higher rate ( we recommend 100X switching frequency). I changed it from 5e-6 to 1e-6.
-Dakai
hello
Thank you for your valuable help. Is there any way to calculate or approximate Lq, Ld, Rs and the flux linkage parameters for any given rated speed. Also, how to calculate the flux lookup table data when increasing the rated speed to a higher value?
