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I need to do the vector control on the motor and what I can have is just line-to-line voltage Vab, Vbc and Vca. How could I calculate quadrature axis voltage components Vlapha and Vbeta then?? (Existed formula are from phase voltage to Valpha and Vbeta)
I got it.
Also, my ph-ph stator voltage is 220Vrms(311Vpeak), so I use 200K Ohm wye resistor with 1/2W. Such design is ok?? So, the less resistor curr., the better? Or any other thing should be paid attention in selecting wye resistor?
Thx a lot!
My motor has general 3 phase stator terminals, but I want to measure the phase-to-neutral voltage (for some control purpose). How can I have the neutral point to do the measurement then??
Pls help!! Thx a lot!
I'm using quadrature encoder to feeback rotor position and how to do the alignment between zero position of rotor and rotor flux (rotor phase A)? And then how to align this position with stator phase A then?
As you might know, this is actually two alignment bet. 3 things...
Thx a lot!!
With dc voltage present, my PWM signals cannot be given to the inverter. I guess this is buz my initial PWMs are inducing a over current so the inverter turn them off. So, I have to run the PWM 1st and then turn on the dc.
So, my solution is to add a delay to dc voltage inside of code. My...
The IM I have is a "wound rotor IM", whose rotor terminals are accessible (just like 3 stator terminals, so I have 6 terminals)...
Suppose I use another motor to drive this wound rotor IM rotating and meantime feed three ROTOR terminals by 3ph sinusoidal voltages(synchronous w. rotor position)...
I cannot agree w. you anymore!
My code is for motor drive space vector modulation (SVM) and require the magnitude of space ref. vector Vsp = sqrt(Valpha^2 + Vbeta^2). As to sin and cos, I'm using buildt-in _Q16sin() and _Q16cos() functions so does not consume much time actually...
I'm using dsPIC33 and just increase PLLFDB register from 45 to 58. The time excution does reduce by around 35usec!!! Thx a lot!!!
As to the better complier, I am currently useing C30, and have no clue about better one. Any suggestions??
Also, since I modify the PLLFDB in the code, do I need to...
I wrote the code in c fixed point Q16 format, and cost 120usec to excute the algorithm. Wanna reduce it to around 50usec. Any suggestions??
I have applied the built-in _Q16() functions for multiplication, power, sin, cos etc., but still too much time spent...
I know nothing about assembly code, so here is what I'm doing:
I have a assembly rouine for atan(), how to make it work for my following c code:
#include "p33fj64gs610"
#include <math.h>
...
int main()
{...
x=4;
y=5;
ang = atan(x,y);
...
}
Attaching assembly code here:
; constant...
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