STS3020 - 7.4V 20kg.cm 360deg Copper Metal Gear Digital Servo Motor

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Datasheet

STS3020 High-Torque Smart Servo With Copper Gears, 360deg Magnetic Encoding And TTL Serial-Bus Control

The STS3020 is a high-torque TTL serial-bus smart servo designed for robotic arms, humanoid robots, quadrupeds, automation systems, and multi-servo motion-control applications. The manufacturer's STS3020-C001 specification identifies it as a 7.4V 20 kg. cm-class servo, while the detailed electrical table specifies up to 22.5 kg.cm stall torque at 7.4V and 19.2 kg.cm at 6V. At 7.4V, it provides a no-load speed of approximately 0.149 sec/60deg.

The servo combines copper gears, an aluminium case, core motor, ball bearings, dual-shaft construction, and a 12-bit magnetic encoder. It supports 360deg absolute position control, multi-turn operation, closed-loop and open-loop speed modes, and step movement. Half-duplex TTL serial communication allows multiple servos to share a common bus while providing feedback for load, position, speed, voltage, current, and temperature.

Key Features

• 20 kg.cm-Class Smart Servo: Designed as a high-torque servo for robotics and automation applications.
• 22.5 kg.cm Stall Torque at 7.4V: Provides strong peak torque at the typical 7.4V operating voltage.
• 19.2 kg.cm Stall Torque at 6V: Supports operation at 6V with substantial torque output.
• 360deg Absolute Position Control: Supports programmable positioning across a complete rotation.
• Dual-Shaft Construction: Provides mechanical output on both sides of the same rotational axis.
• 12-Bit Magnetic Encoder: Provides high-resolution absolute position sensing.
• 4096-Position Resolution: Supports 0-4095 position values across 360deg.
• 0.088deg Electronic Resolution: Provides approximately 0.088deg resolution per position step.
• Multi-Turn Operation: Supports absolute multi-turn positioning up to approximately +/- 7 turns at maximum precision.
• TTL Serial-Bus Interface: Uses digital packet communication for control, configuration, and feedback.
• Addressable Servo IDs: Supports IDs from 0 to 253 for multi-servo bus systems.
• 38400 bps to 1 Mbps Communication: Supports configurable serial-bus data rates.
• Copper Gear Train: Provides durable mechanical transmission for high-load robotic applications.
• Core Motor: Uses an iron-core motor for reliable actuator operation.
• Ball Bearings: Support smooth output-shaft rotation and mechanical stability.
• Aluminium Case: Provides rigid mechanical protection and helps dissipate heat.
• 25T Output Spline: Uses a 25T output spline with approximately 5.9 mm outside diameter.
• Multiple Operating Modes: Supports position, closed-loop speed, open-loop speed, and step modes.
• Acceleration Control: Supports controlled acceleration for smoother starts and stops.
• One-Key Centre Calibration: Allows the current shaft position to be assigned as the servo centre.
• Real-Time Feedback: Reports load, position, speed, voltage, current, and temperature.
• Electronic Protection: Supports configurable overload, over-current, over-voltage, and over-temperature protection.
• PID Control: Provides configurable PID parameters for motion-control tuning.

Applications

• Robotic arms
• Humanoid robots
• Quadruped robots
• Multi-joint robots
• Industrial automation
• Educational robotics
• Research robots
• Pan-and-tilt mechanisms
• AGV mechanisms
• Automated positioning systems
• Multi-servo robotic systems
• Embedded motion control
• Robot joints
• Maker projects
• Intelligent mechanical systems