MCF8316AEVM: Open Loop Jitters

Tool/software:

Hello,

I am attempting to spin a 25W BLDC motor up to ~75k rpm in a short amount of time (as fast as possible similar to a drill spinning up). I am able to spin the motor up to the proper speed, but notice some pretty bad jitters during the open loop acceleration state. It also takes much longer than I was hoping / expecting.

I am currently using the ALIGN mode for motor startup. I see that the IPD mode boasts faster startup times but am having difficulty when attempting to set that up. Current limits and lock limits get tripped quite quickly. I am looking for some guidance as to how best tune this part of the process.

EDIT:

I am able to spin up the motor in what I deem an acceptable speed now using the align mode. However, it is very unreliable. Sometimes it spins up great, other times, it begins spinning up and trips a fault, and still others it goes through a jittering period before entering closed loop acceleration mode.

Proper spin-up phase current:

Fault tripping phase current:

Jittery phase current: