NEMA 23 Stepper motor
A NEMA 23 stepper motor is a stepper motor with a 2.3 x 2.3 inch (58.4 x 58.4 mm) faceplate. Its size is only a coarse indication of its power. The original standard Reprap (Darwin) had a NEMA 23 motor.
Next smaller size is NEMA 17. Bigger sizes exist, but are rarely used in RepRap applications.
Contents
Nanotec
ST5709S1208-B
This was the original standard RepRap stepper motor. It has 400 steps to one revolution (0.9° per step). It actually has 4 coils (which means it can be wired as both a bipolar and unipolar), but we join up the wires to turn it into a bipolar motor.
Bipolar - Serial
This configuration is suited for our driver boards. It has higher impedance and higher resistance which means it draws less current. In this mode it can handle 0.85 amps, which is ideally matched to our L298 based boards. We recommend wiring it in this configuration.
| Name | Color |
|---|---|
| A | Red |
| B | Black |
| C | Green |
| D | Yellow |
You will also need to splice the following wires together:
- Red/White and Black/White
- Green/White and Yellow/White
Bipolar - Parallel
This configuration offers higher performance. It has lower impedance, and lower resistance. That means you can push more electrons through, at a faster rate. However, it will draw about 1.7 amps, which is at the upper end of what the L298 is capable of delivering. We do not recommend wiring it like this. Keep in mind that two wires make up the start and end of each coil.
| Name | Color |
|---|---|
| A | Red and Black/White |
| B | Black and Red/White |
| C | Green and Yellow/White |
| D | Yellow and Green/White |
Keling
KL23H51-24-08B
The first Darwin RepRap with an Arduino controller (Generation 2 Electronics) used this stepper motor. It has 200 steps to one revolution (1.8o per step). It actually has 4 coils (which means it can be wired as both a bipolar and unipolar), but we join up the wires to turn it into a bipolar motor. It is much cheaper than the Nanotec, and with half-stepping it is almost as accurate. (The Keling KL23H51-24-08B is also used in the Eiffel prototype).
Bipolar - Serial
This configuration is suited for our driver boards. It has higher impedance and higher resistance which means it draws less current. In this mode it can handle 1.5 amps, which is ideally matched to our L298 based boards. We recommend wiring it in this configuration.
| Name | Color |
|---|---|
| A | Blue |
| B | Green |
| C | Brown |
| D | White |
You will also need to splice the following wires together:
- Red and Yellow
- Black and Orange
Bipolar - Parallel
This configuration offers higher performance. It has lower impedance, and lower resistance. That means you can push more electrons through, at a faster rate. However, it will draw about 3 amps, which our L298 is just not capable of delivering. We do not recommend wiring it like this. Keep in mind that two wires make up the start and end of each coil.
| Name | Color |
|---|---|
| A | Blue and Yellow |
| B | Red and Green |
| C | Brown and Orange |
| D | Black and White |
Motion Control Products
FL57STH51-2808A and FL57STH51-3008B
The stepper motors are provided by Bits From Bytes. They come in two variations: FL57STH51-2808A, with the axis extending one way; and FL57STH51-3008B with a two way axis like the picture. Bought three from Bits From Bytes and I got one with the axis through and extending from both ends, and two with the axis extending one side. Their weight is slightly above 0.6 kg (I measured 619 gram).
To make the unipolar stepper a bipolar one, connect these wires together:
- Blue and Red/White
- Green and Black/white
| Name | Color |
|---|---|
| A | Blue/white |
| B | Red |
| C | Green/white |
| D | Black |
Lin Engineering
5718X-05S
The 5718X-05S has the right specification to drive RepRap from the PIC controllers but we haven't tested it yet. It should work with the Arduino electronics too. It has 200 steps per revolution, so you need to set the controller to half-step it to get the resolution needed. Take care to get the model where the output shaft comes out front and back, not just at the front.
