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#1
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I have salvaged 2 of these boards. Each board has 2 x A3952SW and the extra components to drive a bipolar stepper. I have done my best to reverse engineer the wires that were going to the main PCB however I'm not sure if this can be driven from a normal step/direction command interface. I hope someone here can set me straight. Thanks for the help. 6 wires coming from Main PCB are: Black---- GND: ground plane on PCB pin 1 on both A3952 Yellow--- Ref: pin 5 on both A3952 Grey----- PhaseB_SideB: pin 8 on SideB A3952 Blue----- PhaseA_SideA: pin 8 on SideA A3952 Red----- +12 or some voltage: pin 3 on both A3952 Brown--- +5 pin: 7 on both A3952 |
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#2
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This is from page 9 of A3952 datasheet, Pinout ,application circuits FULL-BRIDGE PWM MOTOR DRIVER , "The MODE terminal can be used to optimize the performance of the device in microstepping/sinusoidal stepper motor drive applications." Not sure if this helps, but it shows two A3952 being used to drive a bi-polar stepper motor. Hope this helps, Iron-Man |
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#4
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Iron-Man |
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#6
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| Figure 3 shows a "step" input but with a fixed frequency, you want mach 3 etc, to control this frequency. It is possible that the circuit board you have was made to drive a stepper motor. Hope this helps, Iron-Man |
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#7
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| I'm sorry I-M I should have mentioned there was a bipolar 5ohm per phase, 7.5 deg per step bipolar stepper hanging off the larger white connector in the pics. I was looking at using one of these with an atmega48 uC and nema17 (1.8) bipolar to handle the traverse function on a pickup winder I want to make. I have an 18VDC gear-head motor for the bobbin. I want to have 3 settings low/med/high. The gear-head motor runs fine at 5vdc and I cannot stop the shaft with my fingers at 5vdc. I was thinking lo = 6vdc, med = 12vdc and hi = 18vdc. The nema17 handling the traverse will have to speedup or slow down depending on the setting of the gear-head motor. More people might be interested in the project. Maybe I should just look at an m48 and an uln2003 to control the stepper and save this hardware for something more complex. |
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#8
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Thanks for the additional information. I bet that this board was designed to run in a fixed frequency mode. Sounds like a good idea to save hardware for later. Were you able to get the stepper motor to run at all? Iron-Man |
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#9
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| I have not even tried to hookup power to the board. Another thing, I took the heatsink off the board to get a better look at the pins and I yes the enable and mode pins are wired to gnd. So in order to use this board I would have to input a fixed frq signal on the pin 8? What would this type of board be good for? The stepper that it was driving is a propritary design but it is about the size of a nema23. |
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#10
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Iron-Man |
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| A3952SW Driver | Drools | Stepper Motors and Drives | 0 | 10-29-2010 10:54 PM |