Introduction
Servo motors, particularly digital servos like those from GXServo, are widely used in robotics, RC vehicles, and industrial automation. Two critical torque specifications define their performance: rated torque and peak torque. This article explores these terms from an engineering standpoint, focusing on how they impact servo selection and operation.
Rated Torque: Continuous Operational Capacity
Definition:
Rated torque refers to the maximum continuous torque a servo can deliver without overheating or sustaining damage. It is the safe, long-term operating limit under normal conditions.
GXServo Example:
A GXServo GDW-1002MG might have a rated torque of 20 kg-cm (1.94 Nm) at 6.0V. This means it can sustain 20 kg-cm indefinitely under proper cooling and voltage.
Factors Affecting Rated Torque:
- Motor Efficiency – Digital servos like GXServo optimize power usage, reducing heat buildup.
- Duty Cycle – Continuous high-load operation may require derating (reducing torque expectations).
- Voltage Supply – Higher voltage (e.g., 7.4V vs. 6.0V) can increase torque but may affect longevity.
Peak Torque: Short-Term Burst Performance
Definition:
Peak torque is the maximum instantaneous torque a servo can deliver for brief periods (typically milliseconds to seconds). Exceeding this limit risks mechanical failure or motor burnout.
GXServo Example:
The same GDW-1002MG might have a peak torque of 25 kg-cm (2.45 Nm) at 6.0V, allowing brief high-force maneuvers (e.g., sudden steering adjustments in an RC car).
Why Peak Torque Matters:
- Shock Load Handling – Absorbs sudden impacts (e.g., robotic arm collisions).
- Acceleration Needs – Useful in drones or racing applications where quick response is critical.
Conclusion
Understanding rated vs. peak torque ensures optimal servo selection. GXServo digital servos balance both metrics, offering reliability under continuous use while allowing short bursts for demanding tasks.
