Series PI q-d current regulators' Coefficient Calculation

Ibraheem Inam

If I use a series PI Regulator for Torque and Flux currents, do the regulator gain deterministic calculations remain same as mentioned in the lecture part I? i.e. we have to cancel zero of PI regulator with the pole of motor winding. If it is so, then how we will relate the 2 PI regulator zeros with 3 winding poles (L/R) since it is a 3 phase machine and we have only 2 PI regulators?

over 7 years ago

0 Rick Duncan over 7 years ago

TI__Guru** 114905 points

Hi Ibraheem,

Your post is being moved to the C2000 forum for better support.

0 Ibraheem Inam over 7 years ago in reply to Rick Duncan

Prodigy 220 points

Thanks, but my question is related to Motor Control not micro-controllers.

0 Rick Duncan over 7 years ago in reply to Ibraheem Inam

TI__Guru** 114905 points

Hi Ibraheem,

The InstaSPIN firmware for motor control is supported in the C2000 forum.

0 Richard Poley over 7 years ago in reply to Rick Duncan

TI__Mastermind 27200 points

Ibraheem,

In field Oriented Control we are using two PI controllers to separately regulate Id and Iq. In both cases, Dave suggests configuring the gains to cancel the motor pole from the L & R values, which must be known. In a balanced machine, L & R would be theoretically the same in each motor phase.

Regards,

Richard

0 Ibraheem Inam over 7 years ago in reply to Richard Poley

Prodigy 220 points

Given for BLDC motor, Rs(per phase) = 0.1 ohms and Ls(per phase) = 500uH, i have to set Kb(integral gain) = (0.1/500u) of both series PI controllers (Iq and Id) to cancel the winding pole (500u/0.1). Is that true?

0 Richard Poley over 7 years ago in reply to Ibraheem Inam

TI__Mastermind 27200 points

Ibraheem,

If you are using FOC to control a PM motor with sinusoidal back-EMF, then yes, this is correct. I thought from your first post that's what you wanted to do.

Typically a BLDC motor is trapezoidal back-EMF machine, for which a different control strategy would be used.

Regards,

Richard

0 Ibraheem Inam over 7 years ago in reply to Richard Poley

Prodigy 220 points

I got it.

Thanks for reply.

Regards,

Ibraheem

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Series PI q-d current regulators' Coefficient Calculation