In a lift application I use lab 12b for ACIM operation. I cannot use TI identification routine, because it could not determine the parameters of the motors we use in the market. So I wrote my own routine to identfy the parameters.
at lower speeds up to 50% motor runs very well. But after this level motor starts to vibrate and it draws too much current from my driver. By changing the bandwidth of the speed controller I can reduce the vibration a bit, but it is not enough to overcome the whole problem. I think maybe the current controller can be the problem if I identify motor parameters wrong. But in that case I think it cannot work also at speed until 50% of rated speed. Is it true?
I do not have chance to identify inertia and friction at that application. So I put some values that I guess. Can it be the reason? Motor manufacturers give inertia as kgm2, but Instaspin requires it as Aperkrpm. How can I convert it to Aperkrpm?
You can see the motor phase current at that vibration instant, there is a high oscillation in current.
