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Thank you, very informative to watch. I never fully understood the reasoning and working principle of field weakening up until now.

I think tying the equations to a physical diagram of a rotor position wrt the stator winding at one or more points in time or angle would help conceptualize it. Thanks!

WOW, You need a VESC from Bennjamin Vedder, a controller that is open source. Man I would love to pick your brain to help me program my motor, can you explain how to calculate motor inductance difference iq-id? how do I calculate motor flux linkage? These are my measured motor parameters, R = 66 milliohm, Inductance = 366 microhenry with a max voltage of 84 volts, FOC, no field weakening yet.

@matanpazi3777

4 ай бұрын

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.

@shaner.5

4 ай бұрын

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

@shaner.5

4 ай бұрын

@@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.

Your diagram does not address the misconception at all; it merely repeats the assertion in a graphical manner.

@matanpazi3777

Ай бұрын

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.

@eelcohoogendoorn8044

Ай бұрын

@@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.

@danilolattaro

23 күн бұрын

​@@eelcohoogendoorn8044look for "VESC field weakening"