FEETECH HL-3935 Servo Motor
FEETECH HL-3935 Servo Motor
The HL-3935-C001 is an advanced 12V 35kg-class double shaft constant force serial BUS servo powered by a high-efficiency coreless motor and enclosed in a rugged full-aluminum case for exceptional heat dissipation and durability. Engineered for high-end multi-joint robotics, smart industrial linkages, and precise automation, it features ultra-reliable steel gears with a 1/378 reduction ratio, dual ball bearings, a standard 25T/OD5.9mm horn gear spline, and no mechanical limit angles. Operating over a 9V-12.6V range, it delivers a massive peak stall torque of 35kg.cm and a rated load of 8.5kg.cm at 12V, achieving an impressive no-load speed of 0.117sec/60° (85RPM) and a KT constant of 11.5kg.cm/A. Utilizing a customizable PID control algorithm via digital packets, it communicates seamlessly through half-duplex asynchronous serial protocol with an ID range of 0-253 and adjustable speeds up to 1 Mbps. The servo supports versatile operating modes including angle servo (0-360° position control), motor constant speed, and motor constant current modes alongside a unique constant force output configuration and multi-loop mode supporting positive/negative 7 turns. Delivering an ultra-fine electronic resolution of 0.088° (360°/4096 steps) with a neutral position at 180° (2048) and clockwise rotation, this 85±1g smart servo outputs comprehensive real-time telemetry feedback—including load, position, speed, input voltage, current, and temperature—via its 15CM connector wire for sophisticated closed-loop robotic control systems.
| PRODUCT PARAMETERS | |
| Model | HL-3935-C001 |
| Product Name | 12V 35kg 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：40mm B：20mm C：40mm |
| Weight | 85± 1g |
| Gear type | steel |
| Limit angle | No limit |
| Bearing | Ball bearings |
| Horn gear spline | 25T/OD5.9mm |
| Gear Ratio | 1/378 |
| Case | Aluminium |
| Connector wire | 15CM |
| Motor | Coreless Motor |
| Rated Input Voltage | 9V-12.6V |
| No load speed | 0.117sec/60°(85RPM)@12V |
| Runnig current(at no load) : | 200mA@12V |
| Peak stall torque | 35kg.cm@12V |
| Stall current | 3.1A@12V |
| Rated Load | 8.5kg. cm@12V |
| Rated current | 800mA@12V |
| KT constant | 11.5kg. cm/A |
| Terminal resistance | 1.75 Ω |
| Operating Modes | Mode 0: Angle servo mode (default mode, absolute position controllable from 0-360 degrees) Mode 1: Motor constant speed mode (motor constant speed mode, maintains speed without deceleration as the load increases) Mode 2: Motor constant current mode (motor constant current mode,maintains current without decreasing with increasing load) can achieve absolute position |
| Constant force output | Set the output torque value, the servo can maintain this torque (input the target torque value corresponding to address 44, the servo can maintain this torque) |
| Multi-Loop Mode | control of positive and negative 7 turns at the highest accuracy, but the umber of power failure turns is not saved (the resolution can be expanded, and the number of turns can be doubled) |
| Command signal | Digital Packet |
| Protocol Type | Half Duplex Asynchronous Serial Communication |
| ID range | 0-253 |
| Communication Speed | 38400bps ~ 1 Mbps |
| Control Algorithm | PID |
| Neutral Position | 180° (2048) |
| Running degree | 360° (when 0~4096) |
| Resolution [deg/pulse] | 0.088°(360°/4096) |
| Rotating Direction | Clockwise(0→4096) |
| Feedback | Load , Position ,Speed , Input Voltage , Current ,Temperature |