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**How Stepper Motors Work — And Why Engineers Love Them**
Stepper motors are everywhere in precision machines — CNC routers, 3D printers, laser cutters, and camera systems. Unlike a regular DC motor that spins freely, a stepper motor moves in precise, fixed steps. Each step is an exact angle — typically 1.8 degrees, meaning 200 steps make one full revolution.
**How it works**
Inside the motor are multiple electromagnetic coils arranged around a toothed rotor. When you energize the coils in a specific sequence, the rotor locks to the nearest magnetic position and holds it firmly. Change the sequence, and it moves exactly one step. This is called open-loop control — no encoder or feedback sensor needed, because every pulse sent equals one step moved.
**Full step vs microstepping**
In full-step mode the motor jumps 1.8 degrees per pulse — fast but slightly rough. Microstepping drivers divide each step into smaller increments (1/8, 1/16, 1/32) giving smoother motion and higher positional resolution. Most modern CNC machines run at 1/16 microstepping as a good balance between smoothness and torque.
**The one weakness**
Stepper motors lose torque at high speeds. Push them too fast and they skip steps — losing position with no way to know it happened. This is why high-speed precision machines switch to servo motors with encoders instead.
**Where to use them**
Use a stepper when you need precise positioning at low to medium speeds, your budget is limited, and you don't want the complexity of a closed-loop servo system. Perfect for your first CNC build or a custom dispensing machine axis.
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