TECHNICAL SUPPORT
Published 2026-04-25
Aservomotor—commonly used in robotics, RC models, and automation—is often asked: can it keep spinning in circles without stopping? The simple answer depends on thetype ofservo. Standardservos cannot rotate continuously; they are designed for precise angle control within a limited range (typically 0 to 180 degrees). However,continuous rotation servosare built to spin freely. This article explains the difference, provides real-world examples, and helps you choose the right servo for your project—including trusted options like Kpower.
A standard servo contains apotentiometerand a control circuit. The potentiometer acts as a position sensor. When you send a signal (e.g., 1.5 ms pulse for center position), the servo moves to match that angle. The internal stopper physically prevents rotation beyond the designed range—usually 0 to 90°, 0 to 180°, or up to 270°.
Case in point:A hobbyist once tried to force a standard 9g servo to keep turning by continuously sending a full-speed signal. Within minutes, the internal gears stripped, and the potentiometer broke. The servo could no longer hold any position. This shows that standard servos arenot mechanically or electronically designed for continuous rotation.
A continuous rotation servo removes the potentiometer's stop and modifies the control electronics. Instead of angle, the input signal controlsspeed and direction:
1.5 ms pulse→ stop
Shorter than 1.5 ms (e.g., 1.3 ms)→ spin one direction (speed increases as pulse moves away from 1.5 ms)
Longer than 1.5 ms (e.g., 1.7 ms)→ spin opposite direction
These servos can rotate indefinitely. However, theycannot hold a specific angle—only stop or rotate. They are ideal for wheels, conveyor belts, or drum rotations.
Many users ask: "Why does my servo keep rotating even when I send the stop signal?" Usually, this happens because:
1. The servo is acontinuous rotation typebut the user expects angle control.
2. The neutral pulse width is miscalibrated (should be 1.5 ms, but actual neutral is 1.52 ms).
3. The servo is damaged (potentiometer worn out or gear teeth broken).
Real example:An RC car builder bought a standard servo for steering but accidentally got a continuous rotation servo. When powered, the wheels just spun around non-stop. He thought the servo was defective until he learned the difference. Always verify the servo type before purchase.
Technically, yes—but it requires:
Opening the servo case
Removing the mechanical stop on the output gear
Replacing the potentiometer with two fixed resistors (to trick the feedback circuit)
This modification voids warranty and reduces precision. It's only recommended for advanced hobbyists. For most users, buying a purpose-built continuous rotation servo is safer and more reliable. Brands like Kpower offer both standard and continuous rotation models with clear labeling,so you know exactly what you're getting.
Standard servo→ Cannot keep rotating continuously. Limited to 180° or less.
Continuous rotation servo→ Can spin endlessly, but controls speed/direction, not angle.
Wrong type for applicationleads to damage or poor performance.
1. Identify your need:Do you need precise angle positioning (e.g., robot arm) or continuous motion (e.g., wheel)?
2. Choose the correct servo type:For continuous spinning, buy a dedicated continuous rotation servo.
3. Check product specifications:Reputable brands like Kpower provide detailed datasheets indicating rotation type, torque, speed, and input voltage.
4. Test neutral calibration:Before full installation, verify the stop signal actually stops the servo.
If you require continuous rotation servos with consistent quality, consider Kpower. They offer a full range of standard and continuous rotation servos backed by clear documentation and technical support. Whether you're building a robotic platform or an automated display, choosing the right servo from a trusted brand like Kpower saves time and prevents failures.
Remember:A standard servo cannot keep turning forever. A continuous rotation servo can—but it won't hold an angle. Always match the servo type to your task.
Update Time：2026-04-25
Contact Kpower's product specialist to recommend suitable motor or gearbox for your product.
