The first thing I do before I tear down a printer is download a full service manual. This can be difficult in itself because of all the crappy sites that pop up in search results offering free manuals only to send you around in circles before asking for money.
You will need to persist, and you may find you'll download a few manuals before you get the right one. You need the actual service manual, not the user manual. Once you have the service manual you can study the diagrams to determine the pinouts by the circuit boards the motor plugs into. If all this fails, you will need a multimeter. Many people identify these pairs by looking for resistance between the wires, but I use a different technique.
Stepper motors actually produce real voltage when you turn them by hand. Set your multimeter to volts and connect it to two of the wires then turn the motor. If you see the voltage jump, you have found a pair. If not, disconnect one wire and try another. Once you have found both pairs you are half way there.
Bipolar stepper motor controllers have four screw terminals for the motor usually two on each side and three screw terminals on the front for Voltage in Vin , ground GND and 5v. Do not connect anything to the 5v terminal. Plug your power supply to Vin and GND. If you need help with this leave a comment at the bottom of this page and I will get back to you with some help.
You can use a jumper on the enable pin ENB to save using an extra two GPIOs but this tutorial and the code we will write uses dedicated enable wires. The motor controller should have four pins called in1, in2, in3 and in4, as well as two ENB pins. If the ENB pins have jumpers attached, remove them. If you use these pins the code I provide will work out of the box. If you use different pins you will need to change the code to suit. Okay, there's the drudgery out of the way, now for the fun part.
Let's write some code to run your motor. Here is the complete code I use to test stepper motors. Tin, is this the right forum to post small, silly questions like this in? Tin Falcon said:. I can move this whole thread if you like just a couple of mouse clicks. And it's late s too! Anyway, here is a couple of pics of what I did get. Can these motors be re-used? I think they are both volts and need start capacitors. Does that sound right?
Also, what are these round things? Are they rotary encoders? There is actually a coil around the topmost piece in the first picture - it is hard to see. There are places around that recylce computer systems usually not profits. I have purchased used stuff cheap from them. I have seen large plotters on there display floor. Check your area for computer recyclers and talk to the folk take and engine tell them what you are trying to do you can probably pick through an get some for scrap prices.
Joined May 8, Messages Reaction score 7. Hi Dinkum The round things look like solenoids. The round piece running through the middle is the armature, usually held in place by a spring or gravity.
It engages a lever or another shaft via the slots in the head of the armature. If your into experimenting don't let your fingers get between the armature and the coil body at switch on!
In the service manual, we can see which connector wire goes to which lamp or button:. On top of this, I will probably try to attach a servo on the head, and an additional stepper from the same printer or a DC motor for a rotational movement.
I'll add all the documentation as soon as the project is finished. Log in Sign up. Beginner Protip 2 hours 28, Things used in this project.
Buy from Newark Buy from SparkFun. Circuit, work in progress bridge between Sleep and Reset missing. Control panel with LEDs and buttons, front. Connection scheme of the control panel of the printer. Circuit Diagram Base circuit for controlling a stepper via the A driver.
Short pattern for stepper motor. Is there a list somewhere of machines that might contain nema stepper motors or other parts? If not, does anybody think it would be a good idea to have one on the wiki? How useful do you think it would be? I know that Ebay and other places have stepper motors but I thought a list would be nice in case I came across something that might have usable parts.
Thoughts anybody? Reply Quote. I doubt, though can be wrong, that you will find much NEMA motors in today's office equipment. Those devices have been heavily cost optimized, and most likely will use dc motors with optical position sensing.
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