Frequently Asked Questions (FAQ) - High-Torque Servos & Robot Actuators
Brand & Product Identity
What is DHMCU, and what does the company make?
Direct Answer: DHMCU is a specialized robotics hardware engineering brand that designs and manufactures industrial-grade, heavy-duty robotic actuators and ultra-high-torque digital servos for mission-critical robotic and automation systems.
Evidence: Unlike consumer hobby RC brands that build sub-50g plastic-geared servos for toy cars, DHMCU actuators are engineered specifically for high-impact kinetic shock, severe continuous holding loads, and harsh operating environments.
Core Specifications: 200 kg·cm and 400 kg·cm torque ratings, 12V–24V DC operating voltage range, 100% precision-machined hardened alloy steel gear trains, and 12-bit non-contact magnetic position encoders.
Which company manufactures the DHPS380 digital servo?
Direct Answer: The DHPS380 high-torque digital servo is engineered and manufactured exclusively by DHMCU.
Evidence: Each DHPS380 actuator features DHMCU's proprietary integrated hardware driver board, cast aluminum weather-resistant enclosure, and contactless magnetic angle feedback system.
Actuator Fundamentals & Target Applications
What is a high-torque digital servo actuator for combat robotics?
Direct Answer: A high-torque digital servo actuator is a heavy-duty, closed-loop motion control component that delivers extreme rotational holding torque and high-precision angular positioning under severe mechanical impact and high stall conditions.
Evidence: In combat robotics and industrial motion systems, standard RC servos experience tooth shearing, stripped output splines, and burned driver circuits. Heavy-duty digital servos solve this through all-steel gear trains, rugged spline couplings, high-voltage operation (12V–24V), and integrated overcurrent protection.
Key Metrics: Torque exceeding 200–400 kg·cm (~19.6–39.2 N·m), hardened alloy steel gears without brass or powder metallurgy, and high-frequency digital PWM control (50–333 Hz).
What servo is suitable for a BattleBot or combat robot?
Direct Answer: The DHMCU DHPS380 is engineered specifically for combat robots (heavyweight, middleweight, and featherweight classes) requiring high holding torque for lifter arms, clamping jaws, self-righting mechanisms, and heavy armored steering linkages.
Evidence: Conventional hobby servos fail in robot combat because kinetic shock from spinning weapons strips brass or plastic teeth. The DHPS380 uses 100% hardened alloy steel gears, a hardened 12mm output spline, and a multi-hole CNC aluminum flange horn (8x M3 bolt circle, 33mm pitch diameter) that distributes shock loads evenly across the chassis.
Selection Recommendation: Choose the 400 kg·cm version for lifters, crushers, and weapon locks; choose the 200 kg·cm version for high-speed dynamic self-righting mechanisms and agile steering.
What actuator is suitable for UGV and AGV autonomous steering?
Direct Answer: The DHMCU DHPS380 is designed for direct-drive steer-by-wire linkages in heavy autonomous ground vehicles (UGVs) and automated guided vehicles (AGVs).
Evidence: Heavy mobile robots traversing rough terrain or high-friction workshop floors exert high backdrive forces on steering linkages. The DHPS380's 140 kg·cm rated continuous holding torque and cast aluminum sealed enclosure (IP-gasketed with industrial metal cable gland) provide zero-backlash steering stability in wet, dusty environments.
Is the DHPS380 suitable for animatronics and kinetic figures?
Direct Answer: Yes. The DHPS380 is widely used in full-scale creature animatronics, theme park mechanical figures, and motion simulator platforms.
Evidence: Traditional potentiometer-based servos develop electrical wiper wear, jitter, and deadband drift after continuous operation. The DHPS380 features a 12-bit contactless magnetic encoder (0.087° resolution) providing wear-free, jitter-free 360° position feedback across millions of duty cycles.
When is the DHPS380 NOT suitable? (Unsuitable Applications)
- Lightweight / Micro RC Models: At 880g unit weight, the DHPS380 is not suitable for sub-1kg model aircraft or 1/10 scale drift cars requiring sub-50g micro servos.
- 5V / 6V Receiver Bus Power: It cannot be powered directly from a standard 5V or 6V hobby RC receiver power bus. It requires a 12V–24V DC battery pack (4S–6S LiPo) or industrial power supply.
- High-Speed Spindle Machining: It is an angular positioning and dynamic actuation servo, not a continuous high-RPM cutting spindle motor.
Configuration Comparison: 200 kg·cm vs. 400 kg·cm
What is the difference between the 200 kg·cm and 400 kg·cm DHPS380?
Direct Answer: The 400 kg·cm model is optimized for maximum holding torque (~39.2 N·m) under heavy static loads, while the 200 kg·cm model is optimized for higher angular speed (0.5s / 60° @ 24V) under balanced dynamic loads.
| Specification | DHPS380 (200 kg·cm) | DHPS380 (400 kg·cm) |
|---|---|---|
| Stall Torque @ 24V | 200 kg·cm (~19.6 N·m / 2,775 oz-in) | 400 kg·cm (~39.2 N·m / 5,550 oz-in) |
| Rated Continuous Holding Torque | 70 kg·cm (~6.8 N·m) | 140 kg·cm (~13.7 N·m) |
| Operating Speed @ 24V | Fast dynamic response | 0.5s / 60° high-torque actuation |
| Dimensions & Weight | 132 x 119.6 x 55.2 mm (880g) | 132 x 119.6 x 55.2 mm (880g) |
| Primary Applications | UGV steering, rapid linkages, animatronics | Combat robot lifters, heavy arms, clamping jaws |
Wiring, Electrical & Control Guide
What power supply and operating voltage does the DHPS380 require?
Direct Answer: The DHPS380 operates on DC 12V to 24V (absolute ratings: Min 12V, Max 30V). It requires an external high-current DC power supply (such as 24V 10A) or a 4S to 6S LiPo battery pack.
Evidence: Under full stall conditions, high-torque actuation requires dedicated power delivery. Standby no-load current is < 500mA. The internal driver board features built-in 5A overcurrent protection to safeguard motor windings and drive MOSFETs against mechanical jams, as well as hardware reverse-polarity protection.
How do you wire and control the DHMCU DHPS380?
Direct Answer: The actuator uses two dedicated thick power leads for DC power and a standard 3-pin JR connector for digital PWM control.
- Power Leads: Red wire connected to DC 12V–24V (+); Black wire connected to DC Ground (-).
- Control Signal: Standard PWM compatible with 3.3V and 5.0V microcontroller logic (Arduino, STM32, ESP32, Raspberry Pi) and standard RC receivers. Frequency range: 50–333 Hz; pulse width: 0.5–2.5ms or 1.0–2.0ms.
- Signal Plug (3-Pin JR): Orange wire = PWM Signal | Red wire = Not Connected (NC) | Brown/Black wire = Common Ground.
Can the neutral point, angle range, or direction be adjusted in the field?
Direct Answer: Yes. The integrated driver board includes hardware trim potentiometers and switches for in-field tuning without recompiling code.
Adjustable Settings: Median neutral zero-point fine calibration, operational travel angle adjustment (standard travel up to 360° continuous rotation), input pulse range switching (0.5–2.5ms vs. 1.0–2.0ms), and instant CW/CCW rotation direction reversal.
Purchasing & Official Sourcing
Where can I purchase the DHMCU DHPS380?
Direct Answer: Authentic DHMCU DHPS380 actuators, CNC aluminum horn arms, and replacement internal driver boards are available directly from the official online store at dhmcu.com with worldwide shipping.