Advantages of Using NEMA 17 Steppers

What Features Does the NEMA 17 Stepper Motor Have?
A NEMA size motor is the perfect option for a variety of applications. These motors are readily available and come in a variety of sizes. They are also easy to install with no need for costly installation services.

Why Choose the NEMA 17 Stepper Motor?
Nema 17 stepper motors are a type of stepper motor that is used in 3D printers, CNC machines, and other similar applications. They are typically used to drive a lead screw or linear guide.
This article will discuss the advantages of using a NEMA 17 size motor in your application.

How Does a Stepper Motor Work?
A stepper motor is a brushless DC electric motor that divides a full rotation into a number of equal steps. These motors are widely used in computer printers, laser printers, scanners, floppy disk drives, CD-ROM drives and photocopiers.
A stepper motor is an electric motor which can rotate around an axis and which has been divided up into a number of equal sections called steps. The number of steps will depend on the type of stepper motor being used.

Advantages of Using NEMA 17 Steppers
NEMA 17 steppers are generally used in 3D printers. They are the most popular size of stepper motor. The advantage of using NEMA 17 steppers is that they can be driven by a variety of drivers, including bipolar, unipolar, and servo drives.
If you want to use NEMA 16 steppers in place of NEMA 17, then you need to know that there is a difference between their torque and step angles. You would also need to make some changes in your design for the print head carriage if you want to use NEMA 16s instead of 17s.

What are the Best Uses for NEMA 17 Stepmotors?
The NEMA 17 stepper motors are a type of motor that is often used in robotics. The NEMA 17 stepper motor is a general-purpose motor and has a number of uses.
The best uses for the NEMA 17 stepmotors are in robotics, making ornaments, and as an actuator for simple machines.

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Bipolar motors have 4 wires (2 pairs), Unipolar motors typically have 6. Some other motors have 5, or 8, or whatever. 8 wire motors are usually wired as 2 sets of bipolar windings (i.e. essentially 2 bipolars wired together).

Bipolar motors (4 wire) or 8 wire stepper motors (that you can therefore wire the phases in parallel to effectively make them a bipolar) are preferred over unipolar motors. This is because bipolars will have lower coil impedance and therefore more power transfer and torque.

Five (5) wire motors are usually in a "star" configuration that has a common ground and require a specialized driver. TinyG cannot drive 5 wire steppers.

Wire pairs are often color coded by convention. Common wire pairings are:

Green goes with Black. Yellow is often used for the center tap of the Green/Black pair in a unipolar motor
Red goes with Blue. White is often used for the center tap of the Red/Blue pair in a unipolar motor
E.g:

Color | Bipolar | Unipolar | Notes
---------|--------------|---------------|--------
Green | Winding A1 | Winding A1 |
Yellow | (none) | Center tap A |
Black | Winding A2 | Winding A2 |
Red | Winding B1 | Winding B1 |
White | (none) | Center tap B |
Blue | Winding B2 | Winding B2 |

Use your volt meter to verify that green and black connect together, and red and blue connect together, and that they don't connect to the other pair. Typical DC resistance across a winding is about 1 to 5 ohms. If you have a Unipolar motor you can just leave the center taps disconnected.


Finding pairs in a unipolar motor is a bit more complicated, but not much. You want to find the outer taps of each coil. These are often color coded by convention (as above). Using a voltmeter to find the resistance across the outer pair. The resistance between the center tap an an outer tap will be 1/2 the resistance between the outer taps.


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