![]() certainly 24 volts at 5 amps is something you can get for a very reasonable costs. I would say that getting actual photos of the board and the stepper part number (photo of the label?) would allow us to offer voltage. Looking at the project, the motor driver is simple.ĭeciding how to control, logic, and sensor inputs. One consideration is that analog control is often more accurate than digital (some will say heresy, but just stating facts) in looking at the schematic, you have a couple, multi-pole switches, lots of op-amps and comparators.Ĭertainly nothing that could not be done with different hardware. I am certain you can re-wire those for bi-polar and use the Gecko and get very good operation from them. Looking at the instruction manual schematic, you have uni-polar motors with 20V. they make a version with an on-board MCU so you can program that. the Geckodrive above will drive your steppers. ![]() not so much, your choices are somewhat limited. Since you said your skills are on the Biochemist side and Arduino. You have a great reference in that manual. Either way, I need to be able to control any stepper motor driver board with an arduino which is already connected to a NI labview program so that the flow rate of the pump can be controlled as a part of the larger experiment. I am willing to buy a new stepper motor driver I just am not sure if a sparkfun board like EasyDriver - Stepper Motor Driver - ROB-12779 - SparkFun Electronics are available for the specs I may need. My instinct is to buy a brand new stepper driver that can manage the necessary current and connect it directly to the motor coils. I'll be honest with you, I've no idea what it means whether it is the max current the motor draws or something along those lines. Well, there was a sticky note in the documentation binder which said its a 5 amp motor. Let me try and get some values and I'll post them here. Can you measure the resistance of those coils and post the details? Lol if someone at your knowledge level (basing on that excellent stepper motor basics thread) has difficulty with that schematic circuit diagram, than my situation seems hopeless.Ĭan you get access to the wires connected to the coils of the motor? How many of those wires are there? I would expect either 4 or 6. That circuit diagram is far beyond my pay grade. I have had a quick look at your PDF document. Shimadzu-lc-6a-hplc-pomp-service-manual-eng.pdf (984 KB) The original pump has a in built power supply, however, I'll buy a new power supply if that reduces the complexity of the current project I have some PC power supply laying around, however idk if they would suffice or would I need something more high powered. I have played with arduino uno in switching LEDs off and on using both lab-view and IDE but I dont know enough to judge if I can produce the pulse pattern to control the stepper motor using arduino and combine that with some other driver board. I have basic data acquisition knowledge using national instruments USB 6008 and labview but that's my extent of experience. I am attaching the original service manual, page 13 shows the pulse pattern needed for the stepper motor, and page 39 shows the schematic of the original board whose function I am trying to replicate. using a potentiometer, the speed (rpm) of the motor was changed and using some calibration curve, that determined the flow rate. The pump in question was made by a Japanese company in 1980s and performed well for us however, the control board is not working now, and the company has stopped support on it so I am being forced to be creative to make it work again.ĭave in nj: The pump is basically a piston controlled by stepper motor so for one revolution of the motor, the piston draws in a fixed amount of liquid so in the original design I think there was no flow measurement device all they did was monitor pressure, and change the motor current in such a way that the motor rpm stays the same even when the pressure changes. Robin2: The original pump has stepper motor and hence I am trying to use as much original equipment as possible.
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