process of Calibration Angle measurement c2000

utpal kumar

Hi All,

I'm working on PMSM Motor Control Project (with Encoder + FOC).

For that I've imported the HVPM Sensored code from control-suit. I've modified the code as per my requirement and achieved the speed and FOC control as per my need.

Now it's time for production.

In production, the drive and motor will be change every-time, so every time I've to execute the procedure of CALIBRATION ANGLE MEASUREMENT. this is not a fair way.

Can anybody suggest me to skip this process of Calibration Angle measurement?

What's the following line of QEP.h file means?

v.RawTheta = EQep1Regs.QPOSCNT + v.CalibratedAngle;

if (v.RawTheta < 0)

{
v.RawTheta = v.RawTheta + EQep1Regs.QPOSMAX;

}
else if (v.RawTheta > EQep1Regs.QPOSMAX)

{
v.RawTheta = v.RawTheta - EQep1Regs.QPOSMAX;

}

Utpal

over 12 years ago

0 Manish Bhardwaj over 12 years ago

TI__Mastermind 43730 points

Utpal,

Motor control(current loops) work based off electrical angle, the encoders typically provide the mechanical angle. THere can be some mis-alignments due to coupling hence the angle need to be calibrated, if you can make sure these angles are perfectly aligned then you need no alignment. That's all the code does, it measures the initial value by making Iq zero, and then adjusts the angle to match the electrical angle. If this is guaranteed a priori then no need to do this

0 utpal kumar over 12 years ago in reply to Manish Bhardwaj

Expert 2340 points

Thanks Manish,

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process of Calibration Angle measurement c2000