Відео

Not sure for industrial applications. I don't think adding an LC filter would reduce heating or vibrations though. For simple applications I don't think it matters much. Here's a link to an article that goes over the reasons for adding an LC filter: ieeexplore.ieee.org/document/790930 In short: 1. High dv/dt may cause issues with long motor cables. A capacitor would help. 2. High frequency current ripple. An inductor would help. 3. High dv/dt leads to EMI. A capacitor would help. My inputs: 1. Seems like the cable limit length stated in the article is quite generous. A limit of 5[m] of cable for 10,000 V/us seems pretty good. 2. Current ripple depends on the motor inductance and the switching frequency. I suspect this is a non issue for most standard applications (Switching frequencies in the kHz and relatively high inductances, higher than 1 mH). 3. Sure, that could help. There are indeed quite high ripples of voltage on the motor phases, smoothing them out could help.

@matanpazi3777 i see... Can this atmega328 increase carrier frequency of this setup? so adding lc fillter can be smaller

@@FatemeRahbaran That was a long time ago, I don't have the files anymore.

@@rastyisanerd3686 Thanks :) Check out the hardware video, I probably mention it there.

You can see the paper title at 10:46, here's a link to the paper: core.ac.uk/download/pdf/229175724.pdf

@@harrisonb4953 Haha, nice! Good luck!

My pleasure. How so? The JFC2410-1800FS is rated for 250 AC voltage according to the datasheet.

​@@matanpazi3777Here it shows it to be 125V. www.lcsc.com/datasheet/lcsc_datasheet_2305151202_Shenzhen-JDT-Fuse-JFC2410-1800FS_C2994765.pdf

Thanks for your reply. Please see this datasheet in the link. It says 125V for 8A. www.lcsc.com/datasheet/lcsc_datasheet_2305151202_Shenzhen-JDT-Fuse-JFC2410-1800FS_C2994765.pdf

@@matanpazi3777 Thanks for the reply. I am referring datasheet from LCSC here. It says so. www.lcsc.com/datasheet/lcsc_datasheet_2305151202_Shenzhen-JDT-Fuse-JFC2410-1800FS_C2994765.pdf

Would you care to elaborate? Misconception: Field weakening works by essentially lowering the motor's torque constant / back EMF constant. My claim: No, it does not. it's easiest to see that in 5:36, by adding current in the d axis, we can lower the voltage amplitude yet leave the torque constant.

@@matanpazi3777 Im not saying you are wrong; I am saying you are not presenting a novel argument; just the same assertion in a graphical format. Would love to see those experiments on a real motor you alluded to at the start of the video btw.

​@@eelcohoogendoorn8044look for "VESC field weakening"

Glad you enjoyed :)

Certo, as the output power increases (~torque*speed) so does the input power (V*I)

@@matanpazi3777 V*I*(Power Factor) for AC circuits. As the frequency increases the impedance in the stator windings increases which lowers the power factor.

@@matanpazi3777 When I do a thought experiment I predict that the input current will remain constant as V/Hz increases, as long as the load remains the same.

@@matanpazi3777 If power factor correction was done on the motor, so a capacitor was added in the circuit to match the motors inductive reactance, the only impedance would be the resistance in the stator winding. I think the voltage needed to run the motor would be much less 🤷🏾‍♂️

Or u make sure that ur motor has equal inductance in q and d, such that those coupling terms cancle each other out.

No that is not how it works. If you take the Clarke transform of a balanced wye or delta connected inductor in the abc axis you will find that the alpha beta equivalent circuit is the same. However then when you take the parke transform of the alpha beta equivalent circuit, you will find that the dq equivalent circuit consists of the inductor in series with a dependent voltage source equal to the voltage drop of the inductor on the opposing axis. These voltage sources are the coupling terms. This is why all dq models of balanced induction motors have coupling terms.

@@fablearchitect7645 damn ur right I just confused it with the pmsm

@@fablearchitect7645 ur an engineer?

@@dominikz5776 Yep, currently working as power electronic design engineer. PMSM will also have coupling terms because it has the same field stator inductor windings as an induction motor. Any circuit with capacitors and or inductors will have coupling terms in the dq axis.

Thanks. I mentioned the sources in the video itself in red text. In the future I'll simply add links to the sources in the description.

Probably it would be very similar to controlling a pmsm, because if the machine is doubly fed it means there is a constant rotor field and so it is synchronous

Aloha, well there are several methods. First of all what do you need those parameters for? Does the motor even have saliency (Lq, Ld ratio)? You can identify them using step/sine injections and process the response for example. Or w/ an LCR meter, make sure to rotate the rotor to get min (Ld) and max (Lq) values. Regarding flux linkage, you can pretty much measure the bemf between phases and w/ some scaling get the value.

@@matanpazi3777 with min and max values do i average them after take measurements of one revolution

@@matanpazi3777 I can get the motor to run in foc just not smoothly above 15000 erpm. In bldc mode the motor does fine. From what I understand in FOC mode I should get even more performance out of it, but I just can’t seem to dial it in.