TMS320F28069M: Heating up with motor

Part Number:TMS320F28069M

Hello,

we have block of PMSM motor with directly mounted gearbox. At very low temperature(-30°) we need heating up the gearbox because grease in gearbox is stiff. We would like to use a dc current injected to motor before moving with motor.

I would like to ask what is the best option how to do this in Instaspin?