Part Number: INSTASPINFOCMOTORWAREGUI
Tool/software: Code Composer Studio
Hello,
I am using INSTASPIN in the TMS320F28069 to run a custom made 35 kW inverter (50kHz switching freq). We want to run a small 120 000 rpm, 1 pole pair turbine. I am using a modified version of lab 5e from motorware 15.
I know I am using a quite old version of motorware already and I should update sometime but for now I would like to keep using that version for legacy reasons unless there is some known bug with such version.
Everything so far it's been working fine. We can speed up the motor, put some torque on it, change direction and so on. There is only one problem, for some unknown reason the speed reported is off by 40 %!!
For example, I might spin up the turbine to 10 000 rpm and the speed reported by the inverter would be 14 000 rpm (we are using an external resolver to check the speed). Also we have scoped the phase currents of the inverter as well as the angle and they all look good and have the right frequency.
I've seen somewhere that FAST estimates the angle and the speed separately so I guess it could be the case that one is right and the other one is wrong.
To get the speed I am using the EST_getSpeed_krpm function.
Any clue or idea about why this might happen? What parameters affect the speed estimation?
Regards,
Javier
