{"title":"40kg.cm Metal Serial Bus Servo, High Precision And Large Torque, With Programmable 360 Degrees Magnetic Encoder and Brushless Motor","handle":"40kg-cm-metal-serial-bus-servo-high-precision-and-large-torque-with-programmable-360-degrees-magnetic-encoder-and-brushless-motor","url":"/products/40kg-cm-metal-serial-bus-servo-high-precision-and-large-torque-with-programmable-360-degrees-magnetic-encoder-and-brushless-motor","description":"The Waveshare ST3025 is a high-performance metal serial bus servo featuring a brushless motor, steel gearbox, and 360° programmable magnetic encoder. With up to 40 kg·cm of torque at 12V, it is built for demanding robotics applications requiring precise position and speed control.\n\nControllable via UART serial bus, up to 253 servos can be daisy-chained on a single channel. The servo provides real-time feedback on position, load, speed, input voltage, current, and temperature — ideal for closed-loop control systems. Three operating modes (angle servo, speed closed-loop motor, and step mode) make it versatile for a wide range of projects.\n\nKey Features\n\n\n40 kg·cm Torque – High torque output at 12V, suitable for heavy-duty robotic joints\n\nBrushless Motor – Longer lifespan and quieter operation compared to brushed alternatives\n\n360° Magnetic Encoder – 12-bit precision (0.088° resolution, 4096 steps) with no mechanical wear\n\nUART Serial Bus – Daisy-chain up to 253 servos on one channel, 38400 bps to 1 Mbps baud rate\n\nThree Operating Modes – Angle servo (0–360°), speed closed-loop motor (continuous rotation), and step mode (relative positioning)\n\nTwo-Way Feedback – Real-time reporting of position, load, speed, voltage, current, and temperature\n\nAcceleration Control – Configurable speed and acceleration for smooth start/stop motion\n\nMulti-Loop Position Control – Up to 7 full rotations of position tracking in both directions (default precision)\n\nOne-Button Middle Calibration – Set any position as the centre point for easy installation\n\nWide Voltage Input – 6.0–12.6V DC, directly compatible with 3S LiPo batteries\n\nAll-Aluminium Alloy Case – Excellent heat dissipation and mechanical rigidity\n\nHigh-Strength Steel Gears – Low noise, high durability under load\n\nT6061 Aluminium Servo Horns – Corrosion-resistant, included with the servo\n\nFlat-Shaft Flange Compatible – Mount wheels, timing pulleys, gears, and 6 mm shaft couplings (sold separately)\n\n\nSpecifications\n\n\nModel: ST3025\n\nInput Voltage: 6.0–12.6V DC (typical 12V)\n\nStall Torque: 40 kg·cm at 12V\n\nTorque Constant: 9 kg·cm/A\n\nNo-Load Speed: 0.117 sec/60° (85 RPM) at 12V\n\nPosition Resolution: 0.088° (4096 steps over 360°)\n\nStatic Current: 6 mA\n\nNo-Load Current: 380 mA\n\nRated Current: 1.5A\n\nStall Current: 4.4A\n\nBaud Rate: 38400 bps – 1 Mbps (default 1 Mbps)\n\nID Range: 0–253\n\nGear Type: High-precision steel\n\nDimensions: 40 × 20 × 40 mm\n\n\nIdeal For\n\nQuadruped and hexapod walking robots\nRobotic arms and grippers\nPan-tilt camera mounts\nIndustrial automation requiring closed-loop control\nAny project needing high-torque, precise servo positioning\n\n\nPackage Contents\n\n1× ST3025 Serial Bus Servo\n\n\n\nTip: For easy control of multiple ST3025 servos, pair with the Serial Bus Servo Driver Board which integrates power supply and control circuitry with ESP32 Wi-Fi control. Note that high-torque servos draw significant current — ensure your power supply can handle the total load when running multiple servos simultaneously.\n\n\nResources\n\n\nWaveshare ST3025 Wiki – Documentation, software, and 3D models\n","vendor":"Waveshare","product_type":"","in_stock":true,"options":[],"variants":[{"id":1399,"title":"Default Title","sku":"WS-24702","price":127.44,"on_sale":false,"in_stock":true,"available_quantity":11,"option1":"Default Title"}]}