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#3
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I am not expert, but I think software is written for LMDs not for L298. At least, L298 doesn' support microstep. |
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#5
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| What is your reason for wanting to move away from the LMD18245? It is a bit expensive at 2x$12 per axis, but it has all sorts of advantages over a discrete implementation. Do you need more current than 3A, or much less? |
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#6
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| Hello, yes, I would like to build a stepper driver with 5 or 6 amps or more (bipolar motors, minimum 1/8 step). I want to have more power to play around different cnc machines. I the moment I use a driver with IMT901 from Nanotec wit only 2 amps. A set of LMD is a little bit expensive. LazyBee |
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#7
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| Saying that, I have 2 x 15.2A steppers that I want to start using next year so I too will be looking into high power designs. My PICSteps drive these motors fine at 3A 40VDC though! One idea I had was to use the drive circuit from the UHU servo motor driver or the Open Source Motor Controller (http://www.robotpower.com/products/osmc_info.html) and connect 2 of these to a pic (or maybe even a DSP if I start taking my brain tablets). I think this would be more for fun than economics though. |
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#8
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| Hello, yea a had a look at http://pminmo.com/ . But I don't foud what I'm looking for. My first idea was to use mircochip AN822 without the L298 and to use instead L298 a discrrete h-bridge. But the AN822 works on a serial port and my software is for a par port (step/direction). LazyBee |
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#9
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AN822 uses a step and direction pin AND a serial input. I am pretty sure they will work without the RS232. You'll only get 2A though and they can get pretty hot. I think you can parallel them to get more current though this may get a bit tricky with the current sensing. |
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#11
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| How about this h-bridge, 50V, 20A http://www.irf.com/product-info/data...rel/m3h310.pdf I got my picstep working yesterday, drove the keling 282 oz-in steppers without warming up much using a 40V supply, no mechanical load though. Used some old pentium 2 cpu heatsinks I had, didnt need to hook up the fans on them. This was the first time I built anything with a PIC in it, they are impressive little devices. |
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