On Monday 06 July 2009, Peter Cauchy wrote: >Hello all, > >I have just now gotten my mill up and running, and am trying to optimize >the motion and speed of the motors. > >Has anyone used a CMD-50 driver from API? I have the manual, but the >only timing info it has is: > >DRIVE TYPE .............................. 2 phase, bipolar, constant >current, MOSFET chopper, 20 KHz fixed. >RESOLUTIONS .......................... 200 and 400. >POWER >Inputs ........................................ 15-40 VDC, +5VDC for >Logic 100mA min. >Output ....................................... 0.3-3.5 amps/phase. >LOGIC INPUTS >Type .......................................... TTL compatible. Need to >sink 15mA. >Step ........................................... Square wave - 10μS >minimum width. Step on trailing edge. Optically isolated. >Direction .................................... CW/CCW. Optically isolated. >Step Mode ................................. HALF/FULL. Optically isolated. >No Power .................................. ENA/NOPWR. >Current Mode ............................ CIRCULATING/NON-CIRCULATING. >Reset ......................................... NORMAL/RESET. Optically >Isolated. > >I am driving 1.4A 4.5v 2deg steppers with 16-19.5 v p/s > >Currently the best motion I am getting is .1 in/sec, with losing steps >at anything above .2 in/sec >Any help would be appreciated. > There is a sorta rule of thumb about motor voltage ratings and actual power supply voltages. A 4.5 volt motor would indicate a relatively high inductance motor winding, one that to move with any real speed would require something more than the < 20 volts you have, more like 50 to 100 volts. Most of the motors used on smaller stuff are usually rated 2.5 or more amps, and only a couple of volts. Can the drivers you have survive a higher voltage? That would be the cheapest way to get more speed. They may require active (fan) cooling, so check their spec sheet.
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