How To Pick The Right Stepper Motor For The Job And What You Need To Know

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How To Pick The Right Stepper Motor For The Job And What You Need To Know

 

Stepper Motor Types

sThere are a many types and variations of stepper types, some of which require very specialized drivers. For our purposes, this guide will focus on stepper motors that can be driven with commonly available drivers.

Step mottors driven with commonly available drivers are: Permanent Magnet or Hybrid steppers, either 2-phase bipolar, or 4-phase unipolar.

Motor Size

One of the first things to consider is the work that the motor has to do. As you might expect, larger motors are capable of delivering more power. Stepper motors come in sizes ranging from smaller than a peanut to big NEMA 57 monsters.

Step Count

The next thing to consider is the positioning resolution you require. The number of steps per revolution ranges from 4 to 400. Commonly available step counts are 24, 48 and 200.

Resolution is often expressed as degrees per step. A 1.8° motor is the same as a 200 step/revolution motor.

Gearing

Another way to achieve high positioning resolution is with gearing. A 32:1 gear-train applied to the output of an 8-steps/revolution motor will result in a 512 step motor.

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