Turns out the driver really did not consider speed to be a first class citizen and was all about positioning, which is fine as far as it goes, but not really what we want for our use.
I considered designing a replacement drive card that took speed seriously, but the thing also had significant cogging tendencies which were going to be hard to get rid of completely in an after market motor control card, so I have put that one aside for the time being.
What I really wanted was a DD BLDC which was coreless (Hence no tendency to cog), well, turns out such a thing DOES exist... Enter the Yaskawa SGMCS-05 and friends (Be a little careful some of the bigger ones do have cores), 5Nm (Steady state, about 15Nm for a second until the coils over heat), and available on ebay for a couple of hundred dollars brand spanking new (As opposed to well over a kilobuck list).
Course I had to have one to experiment with, and today it turned up.... Only trouble is it doesn't come with the connectors for the motor cables, and EVERYONE is out of stock
! The Yaskawa driver has a speed mode, but it is analog input, so will need an external pll to lock it to target speed annoying enough that I may just design my own drive card eventually, but it should work alright for now.
Just wondering if anyone has played with this sort of thing in a platter drive application? 50kg/cm (Using the weird units that seem to go with turntables) is very attractive, and the price is not too bad.
Chipmageddon is really getting on my nerves at this point, nobody has any stock of anything, goddam vaccine manufacturers buying up all the microchips!
