FEETECH HL-3925 Servo Motor
FEETECH HL-3925 Servo Motor
The HL-3925-C001 is an advanced 12V 25kg double shaft constant force serial BUS servo featuring an aluminum case, copper gears (gear ratio 1/275), and durable ball bearings. Powered by a core motor, this no-limit servo operates within a 9V–12.6V rated input voltage range, delivering a peak stall torque of 25kg.cm, a rated load of 4.8kg.cm, and a no-load speed of 0.182sec/60° (55RPM) at 12V, supported by a 2.7A stall current and 650mA rated current. Characterized by a terminal resistance of 2.39Ω and a KT constant of 9kg.cm/A, it offers multiple operating modes including angle servo (0–360° absolute position), motor constant speed, and motor constant current modes, alongside constant force output and a ±7-turn multi-loop mode. Communicating via half-duplex asynchronous serial communication with a PID control algorithm, it supports an ID range of 0–253 and communication speeds of 38400bps–1Mbps, with a clockwise rotating direction (0→4096) and a 360° running degree. Its 12-bit resolution provides precise 0.088°/pulse (360°/4096) control and comprehensive feedback on load, position, speed, input voltage, current, and temperature.
Common use cases: High-precision humanoid robot arm and leg joints requiring 0.088° resolution and multi-mode control at 12V, collaborative robot (cobot) end-effectors with constant force output, industrial automation requiring serial BUS daisy-chain wiring, and applications needing 25kg.cm torque with comprehensive real-time telemetry.
| PRODUCT PARAMETERS | |
| Model | HL-3925-C001 |
| Product Name | 12V 25kg.cm Double Shaft Constant Force Serial BUS Servo |
| Storage Temperature Range | -30℃~80℃ |
| Operating Temperature Range | -20℃~60℃ |
| Temperature Range | 25℃±5℃ |
| Humidity Range | 65%±10% |
| Size | A：40.2mm B：20.2mm C：40mm |
| Weight | 61.7±1g |
| Gear type | Copper |
| Limit angle | No limit |
| Bearing | Ball bearings |
| Horn gear spline | 25T/OD5.9mm |
| Gear Ratio | 1/275 |
| Case | Aluminum |
| Connector wire | 15CM |
| Motor | Core Motor |
| Rated Input Voltage | 9V–12.6V |
| No load speed | 0.182sec/60° (55RPM)@12V |
| Running current (at no load) | 170mA@12V |
| Peak stall torque | 25kg.cm@12V |
| Stall current | 2.7A@12V |
| Rated Load | 4.8kg.cm@12V |
| Rated current | 650mA@12V |
| Torque Constant (KT) | 9kg.cm/A |
| Terminal resistance | 2.39 Ω |
| Operating Modes | Mode 0: Angle servo mode (default — absolute position 0–360°) Mode 1: Motor constant speed mode (maintains speed as load increases) Mode 2: Motor constant current mode (maintains current as load increases, supports absolute position) |
| Constant force output | Set target torque value (address 44); servo maintains this torque output |
| Multi-Loop Mode | ±7 turns at highest accuracy (power-off turn count not saved; resolution expandable) |
| Command signal | Digital Packet |
| Protocol Type | Half Duplex Asynchronous Serial Communication |
| ID range | 0–253 |
| Communication Speed | 38400bps ~ 1Mbps |
| Control Algorithm | PID |
| Neutral Position | 180° (2048) |
| Running degree | 360° (0~4096 steps) |
| Resolution | 0.088°/pulse (360°/4096) |
| Rotating Direction | Clockwise (0→4096) |
| Feedback | Load, Position, Speed, Input Voltage, Current, Temperature |