Choosing the right driver board/chip with a stepper motor.

Other Hardware Motors, Mechanics, Power and CNC
1

Hey community,

I know, that variation of this question have been inquired in other places before, but I could not gather the answers that I need to be sure I am buying the appropriate equipment. I hope your can help me.

I am currently attemping to build a DrawBot (see PlotterBot Prior Art | PlotterBot). It runs two steppers on an Arduino.

I was given 2 Stepper Motors (Sanyo Denki 103-H7123-0740 http://www.rta.it/pdf/103-H7123-0740.pdf ). Now after consulting the data sheet I am still a bit clueless. Does the amperage refer to each coil or the overall consumption? If 3A is the current, how do I need what is the stall current?

Now as far as I am concerned, Arduino Motorshield 2.0/ tinyG and other products based on DRV8825/L298/A4988 are not supporting motors with such high currents (3A) current.

However, I am not able to determine what driver to pick.

I learned that the max. current of the driver chips should be times 1.4 of the motors driver (so in my case 4.2A) . However, I saw many set-up where the driver chip current was bearly more than the motors. I came across this tutorial http://www.instructables.com/id/ARDUINO-UNO-TB6560-Stepper-motor-driver/all/?lang=de using an Arduino with a TB6560.

So I would like to buy this board but I am not sure what specifications I should look out for.

I would like to power them using an

Thank you for your patience and time. Everyone starts small :slight_smile:

2

You should use motor in bipolar mode in which case it draws 2.2A. These numbers usually mean "per coil".

You need to check, but I suspect the current ratings for the TB6560 are also "per coil" so it should be suitable. An Uno should be well able to control everything.

The 7A power supply might be on the low side.

The TB6560 should allow you to control the max current for each motor so you could set them to something suitable for your power supply - at the expense of reduced motor torque and max speed. You may find that the motors are overpowered for moving a pencil - I think they are Nema 23 size - but, hey, if they were free!

...R

Edit to add ...
From the picture it looks like the driver board is designed to connect to a PC parallel port. Make sure you know which pins are needed to connect it to the Arduino. ...R