How to increase Phase Voltage?

[DMeie.2]

MCSDK version is 6.2.1

Our motor is running fine and can drive some load, however I'd like to increase the Phase Voltage with which our motor is driven to further increase its power output.

When checking the High Frequency Plot for V_Q (and thus the peak voltages for V_alpha and V_beta), it always hovers at around 2V even under high load. The system's supply voltage is 12V.

Which values do I have to modify to change V_Q?

[cedric H · Accepted solution]

Hello @DMeie.2 ,

V_Q is an output of the PID of the current loop. (same for V_D).

The Input of this PID is the error between the target Iq Ref and measured Iq.

Is your Iq far from the Iq ref ?

If you are in speed mode, the IQ ref is computed by the speed loop PID. If you are in torque mode, IQref comes from your application (or the torque ramp set by the Pilot).

So, to increase your Vq, I would suggest increasing IQRef (by setting a torque ramp or increasing the speed), the other option is to tune your Torque PI regulator, it can be done from the Pilot. To do so, click on Advanced Configuration, it will give you access to additional settings, Torque PI regulator is part of them.

Hope it helps

Cedric

[DMeie.2]

Thanks, I'll play around with the regulator settings.

Torque mode helps a lot as one can directly see the relation of the required torque to the generated phase voltage.
For anyone else looking, it's explained reasonably well in the MCSDK Manual under "A priori determination of flux and torque current PI gains" and in the FOC introduction.