Hello dumitru-daniel.popa
like you have shown in module 5 I want to measure the voltages directly with an oscilloscope:
For me it was only possible to get this (Motor is not connected):
A - Terminal Phase A, GND
B - Terminal Phase B, GND
M - A-B (Math Operation)
So the line voltage A-B does not have the same trend as yours.
Mine is only positive or negative because the PWM signals are centered and not shiftet like you signals.
It doesn't madder if I'm using the "eFlexPWM_Three_Phase_Output", three single "eFlexPWM_Complementary_Output" or the "FTM_Three_Phase_Output" block...
With Freemaster I could see this signals, which are fine.
So it has to depend on the PWM block ? Are there any differences between S32K and KV4x ?
Best regards
Leon
Hello dumitru-daniel.popa
I want to make my last post here, so you can find it better in the middle of all the other posts.
I'm now able to download the code to the target and checked the variables in freemaster (only in polling mode) like you did in module 5 !
The download works anytime successful but it only runs if the Driver Subsystem FNB41560 is commented out.
So the ADC communication makes anything wrong.
Do you see the mistake in the subsystem ?
FNB41560:
ADC Samples:
Also this question is still relevant for me:
For example I want to stop the PWM if temperature is higher than 100°C.
By the way: What is your temperature recommendation for shutting down ?
Best regards and allways thank you for so much help ! You are a great teacher !
Leon
Hi Daniel,
In the data sheet I found some information
http://www.mouser.com/ds/2/149/FNB41560-484544.pdf
The "Total System" should be the complete Motion SPM FNB41560 Driver, so as absolut limit I would suggest 125°C.
Best regards
Leon
Hi wangxuan
good Job, we are getting closer ! Again I have attached my model.
I've seen your / mine / our modified model and think we could use the data type conversation in the Slow Loop Control Subsystem like shown below:
Then the Speed_Reference (yellow line in COMMANDS) is exactly the same like in module 5 s32k example.
Your implemented gains in the Fast Loop Control Subsystem
Now I was able to simulate correctly. Here are the results:
Like you see the COMMANDS and SVM are completely the same like in s32k module 5.
(U_Alpha and U_Beta are still upscaled)
But in EFFECTS we have some differences, the Motor Speed swings extremely:
I have made some Simulation runs (blue --> wc = 0.001; yellow --> wc = 1; red --> original pmsm module5)
How we could get the same result as in the pmsm Workshop module5 (red line) ?
After this step is done we could parametrize our own Motor with the values of R,L and so on.
Another way could be to use the Simscape Power Systems Toolbox instead of the Simulink PMSM model.
Also the Parameters of the LUT in the Slow Loop Control Subsystem I didn't have parametrized yet.
If this is done I want to download the code to the target and see the results in FreeMASTER.
Best regards
Hi Leon Thürnau,dumitru-daniel.popa
Good job! I got the same result as yours, I found that the back EMF we got was very large at the beginning, and the speed oscillations were obvious at this time. I think the problem lies in this (I do not know if I am correct), because rightly, our speed should be small at the outset, So the back-EMF should also be small, I think it should be caused by motor parameters do not match. The bus voltage we needed was 27 times larger, resulting in a large input phase voltage (about 150 times larger). I modified it according to the PMSM motor parameters in Table 1 and the current reached 300A (which seems to be wrong ), The following is the result I got. It seems that the speed oscillation problem appears to be getting better, but the phase current waveform changes greatly compared with the original one. In contrast, because the back EMF phase and the phase voltage phase are offset, Becomes no longer symmetrical. What do you think and correct? Thank you!
motor model | 60ST-M01330 |
Rated power （W） | 400 |
Rated line voltage（V） | 220 |
Rated line current（A） | 2.8 |
Rated speed（rpm） | 3000 |
Rated torque（N.m） | 1.27 |
Peak torque（N.m） | 3.8 |
Back EMF（V/krpm） | 28 |
Torque coefficient（N.m/A） | 0.5 |
Rotor inertia（Kg.m2） | 0.302×10-4 |
Winding (Line) Resistance （Ω） | 5.83 |
Winding (Line) Inductance （mH） | 12.23 |
Electrical time constant （ms） | 2.1 |
Best regards,
wang xuan
Hi,
with Udc = 12V in FNB41560 Subsystem and wc = 1 in PMSM model I got the same results like in module5 example.
So in General the Problem is the higher bus voltage and another Motor.
I will try to parametrize my Motor and see what happens.
Best regards
I've looked a bit over the model. I think is an issue related with MATLAB solvers for diff. equations. It looks like you changed the simulation parameters. Mine is using:
Anyhow, you could try to modify the wc initial condition.
You should be able to start see speed & back-emf. If you need further details about the motor - then you can check this one: Dynamic Simulation of Electrical Machines and Drive Systems Using MATLAB GUI | InTechOpen
Hope it helps!
Daniel
I don't have your advanced Parameters in the second Screen:
How could I activate them ?
