Passing functions as arguments to one another

Question

Ritoshirsa Sarkar 2020-12-8

回答： Sabin 2023-1-9

Hi,

I'm trying to find the d and q axis flux linkages in a Permanent Magnet Synchronous Motor(PMSM). The equations are as follows:

Ψd = ʃ(Vd– (rs*id) + ωr*ψq).dt (1) //d-axis flux linkage

Ψq = ʃ(Vq– (rs*iq) + ωr*ψd).dt (2) //q-axis flux linkage

id = (Ψd – k)/Ld

iq = Ψq/Lq

The process is iterative where ωr is the rotor speed(electrical) and k is a constant quantity.

Clearly, (1) and (2) are coupled.

I cannot figure out as to how two functions can be passed as input arguments to one another, as in this case.

Consider that the motor runs from zero speed to steady state and id, iq being zero to beign with.

[d(Ψd )/dt and d(Ψq)/dt are back emf values; id and iq are d and q axis currents, respectively]

Any suggestion would be very welcome.

Thank you.

Answer 1

Sabin 2023-1-9

You can use the flux from the previous iteration as input to your function when computing the new value.