NEMA 23 Stepper motor

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NEMA 23 Stepper motor

Vitamin

Cache-dsc03106.jpg
A NEMA 23 sized stepper motor.
Wikipedia 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 not an indication of its power. The original standard Reprap (Darwin) had a NEMA 23 motor.

Contents

Suppliers

Below is a non-exhaustive list of possible motors and suppliers.

You are welcome to add information on a stepper motor/vendor you encounter, but please add only steppers which were tested to actually work on some printer.

Manufacturer Model Holding torque Rated voltage Shaft Step angle Motor length Additional notes Vendor (shipping location)
Keling KL23H51-24-08B 0.9 N·m   Ø 5 mm single 1.8° The first Darwin RepRap with an Arduino controller (Generation 2 Electronics) used this stepper motor. The Keling KL23H51-24-08B is also used in the Eiffel prototype. KL23H251-24-8B Torque/Speed Curve Keling (US)
Motion Control Products FL57STH56-2008B 1.24 N·m 5.04 V Ø 6.35 mm double 1.8° 56 mm    
Motion Control Products FL57STH51-3008B 1.24 N·m 3.15 V Ø 6.35 mm double 1.8° 56 mm    
Nanotex ST5709S1208-B 1.06 N·m 2.7 V single 0.9° 52.5 mm This was the original standard RepRap stepper motor. Nanotec seems to recommend the ST5909 as a replacement for the ST5709. Farnell (UK)
Thingibox TB57HT76-2904BC 1.85 N·m 3.2 V double 1.8° 76 mm Full power for any CNC applications. Thingibox (ES)

No report on successful application in a RepRap printer, yet, so your mileage may vary:

Manufacturer Model Holding torque Rated voltage Shaft Step angle Motor length Additional notes Vendor (shipping location)
Lin Engineering 5718X-05S 0.71 N·m   Ø 5.84 mm double 1.8° 44 mm    
RobotDigg Nema23 56mm Depth 1.3 N·m   Ø 8 mm single 1.8° 56 mm 1/4" shaft and longer body 76mm availble  CN;

Nanotec

ST5709S1208-B

Splicing wires
Another photo of the original RepRap stepper motor?

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

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

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

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.

External References