Waveshare
25kg.cm Wide Range Voltage Serial Bus Servo, High Precision And Large Torque, With Programmable 360 Degrees Magnetic Encoder
The ST3020 is a high-torque 25kg·cm serial bus servo with a 360° magnetic encoder, supporting 6–14V wide-range voltage input. It features an aluminium alloy ...
The ST3020 is a high-torque 25kg·cm serial bus servo with a 360° magnetic encoder, supporting 6–14V wide-range voltage input. It features an aluminium alloy middle case, iron-core motor, and metal gearbox for reliable performance in demanding robotics applications.
The servo communicates via UART serial bus, allowing up to 253 servos to be controlled on a single channel. It supports multiple operating modes including angle servo mode (0–360°), speed closed-loop motor mode, and step mode. Two-way feedback provides real-time position, load, speed, voltage, current, and temperature data.
Key Features
- 25kg·cm Torque at 12V – High torque for demanding robotic joints and mechanisms
- 360° Magnetic Encoder – 12-bit precision with no friction or wear, extending servo lifetime
- Wide Voltage Input – 6–14V DC, compatible with 2S or 3S lithium batteries
- UART Serial Bus Control – Daisy-chain up to 253 servos on one channel
- Multiple Operating Modes – Angle servo, speed closed-loop motor, and step modes
- Two-Way Feedback – Real-time position, load, speed, voltage, current, and temperature
- Acceleration Control – Settable speed and acceleration for smoother motion
- One-Button Middle Position Calibration – 360° installation at any angle
- Multi-Loop Position Control – Up to 7.5 loops in both directions under default precision
- Aluminium Alloy Case – Improved heat tolerance and rigidity
- Metal Gearbox – High-precision copper and steel gears for low noise and stability
Specifications
- Torque: 25kg·cm (at 12V)
- Input Voltage: 6–14V DC
- Encoder: 12-bit magnetic (360°)
- Interface: UART serial bus
- Servo Wheels: T6061 aluminium alloy
Ideal For
- Quadruped and hexapod walking robots
- Robotic arms and grippers
- Pan-tilt mechanisms
- Projects requiring closed-loop servo control
Package Contents
- 1× ST3020 Serial Bus Servo
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- encoder
- A device attached to a motor or shaft that reports movement, such as rotation steps or position. In a pump system, an encoder can help measure or control how much the motor has turned, which affects how repeatable the watering amount can be.
- servo
- A servo is a motor with built-in position control, usually told to move to a specific angle by a control signal. It matters when you need repeatable movement, such as steering, arms, flaps, or linkages, rather than continuous spinning.
- Tolerance
- Tolerance tells you how far the real resistance value may be from the printed value. A 1% resistor is useful when a circuit needs more predictable behaviour than a looser 5% or 10% part.
- Torque
- A twisting force that causes something to rotate, usually measured in newton-metres or kilogram-centimetres. It matters when choosing motors, servos, gears, and tools because higher torque is needed to lift heavier loads, turn larger wheels, or move mechanisms without stalling.
- UART
- UART is a simple serial connection that sends data over separate transmit and receive wires, often labelled TX and RX. It matters because this module is designed to replace a wired UART cable with a wireless link while keeping the same serial data format.
Find this product in
Robotics & Motion
