Hi all, The spindle and motor drive in our engraving machine are due for replacement... Well, to tell the truth they were due for replacement on day one. I've ordered a suitable drop in replacement motor to replace the horrid 90V DC motor and drive board, the replacement is a 48v BLDC motor. It has a digital drive that accepts PWM input and the hall sensor inputs from the motor. The max speed of the new motor is 12000rpm.
The machine is getting overhauled and I'm totally rebuilding the control box, so changes at this point are worth making! I'd like to know if it's possible to measure the actual speed of the spindle by also connecting the 3 hall sensor signals to the inputs of my 5I23 Mesa card - then to feed this back with a PID to control the PWM output to the BLDC drive. If so, how would I set this up? I've seen Andy Pugh's BLDC module, but I'm not 100% sure what I really want to set up! I know that I don't need to drive any commutation outputs, just to count the movement of the motor. Having experienced dodgy spindle drives while within reach of Estop, I'd appreciate the machine being more aware of what is actually going on. It normally engraves and cuts holes in batches of plastic panels which are far from free, wrecking a batch because of silly hardware failure is a costly mistake. Being able to trust the machine is high on my priority list... The run time of a batch of panels is quite long and getting on with something else is surely /the/ reason to own a machine to do your bidding! :) I do look forward to making a non-chinese control box - hopefully the new parts will begin arriving very soon. Thanks for any pointers... :) Best, Ed ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
