If you were to apply a static DC voltage to the stepper motor coils then you would apply 3.78 volts to get the 4.2 amps of holding current. The voltage rating is actually just a mathematical calculation:ĬURRENT (4.2 Amps) x RESISTANCE (0.9 Ohms) = VOLTAGE (3.78 Volts)
The voltage rating is NOT the maximum voltage that the stepper motor can handle, nor is it the operating voltage that the manufacturer recommends you use in your design. Which, to many people, may seem a bit on the small side! But one of them might seem a bit strange. Most of the specifications are pretty self-explanatory. This motor has the following specifications:Īs you can see from the size and weight, this is a BIG motor! This is a NEMA 23 Bipolar Stepper Motor from Stepperonline. Let’s take a look at the specifications of the stepper motor we are going to be using today. To use a larger stepper motor we will need a bigger driver or H-Bridge, one that is capable of handling the current our motor will require. In the previous article, we used both an A4988 stepper module and an L298N H-Bridge to drive bipolar stepper motors with an Arduino to drive a common NEMA 17 size motor. Most large stepper motors are bipolar, meaning that they have 4-wires, two per coil assembly.īipolar stepper motors can be driven using dedicated modules or with H-Bridges. In the previous article, we learned that stepper motors are available in two common wiring configurations, Unipolar and Bipolar.
We have covered stepper motors in detail in an earlier article and video, so if you need a refresher please see the previous material. The main difference is in the selection of a driver module. Using the larger stepper motors with an Arduino is not very different from using smaller ones. On the other end of the scale are huge steppers that can control the position of industrial-sized 3D printers and CNC machines. On the small end of the scale are the steppers used within DVD and Blu Ray drives to position the laser head.
Stepper motors are available in a wide range of sizes.
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