Inaccuracy of power measurement vs speed of the motor

[SAkki.1]

We are using STM32F301 micro along with 5.4.4 motor control SDK. We found that at different speeds we get different power measurments for the same amount of power output of the motor.

Is this due to the fact that PQD_CalcElMotorPower() does not use power factor for calculating power?

In our user code we are using MPM_GetAvrgElMotorPowerW(pMCT->pMPM) to limit the output power of the motor and this is not working properly because of the accuracy of the power measurement at different speeds of the motor.

[Laurent Ca...]

Dear @SAkki.1​ 

Just in case, could you try wit the last STM32 MC SDK version?

Best regards

==

Laurent Ca...

[SAkki.1]

The power calculation function did not change in the 5.Y.1 version (5.6 SDK). Not sure if the calculation error will improve with new SDK. Will check when possible.