Kpower HBL838 Brushless Digital Servo, 4.8–8.4 V, PWM/TTL/RS-485 for RC Models and Robotics

Kpower

$139.00 USD

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Version HBL838

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Overview

The Kpower HBL838 is a brushless digital servo for RC models, UAV mechanisms and robotic motion control. Its aluminum-alloy case and metal gears provide a compact actuator measuring 40 × 20 × 38 mm and weighing 66 g. It operates at 4.8–8.4 V, with PWM, TTL and RS-485 listed as control protocols. Voltage-specific torque and speed values help match the servo to the intended supply and mechanical load.

Features

Brushless motor with digital servo control.
Metal gearing; the HBL series specifies high-precision metal gears.
Aluminum-alloy case and two ball bearings (2BB).
Potentiometer position sensor.
25T output horn spline with a 5.9 mm diameter.
120° travel angle, described as customizable.
PWM, TTL and RS-485 control protocols are listed for HBL838.

Specifications

HBL838 General Specifications

Parameter	Value
Model	HBL838
Servo type	Digital, brushless
Stall torque, unconditioned listing value	28 kg; torque unit supplied as kg, with no test voltage stated
Rated torque	7 kg; torque unit supplied as kg, with no test voltage stated
Torque, unconditioned HBL838 comparison value	28 kg·cm; test voltage not stated
No-load speed, unconditioned listing value	0.15 s/60°; test voltage not stated
Weight	66 g
Dimensions	40 × 20 × 38 mm
Travel angle range	120° (customizable)
Operating voltage	4.8–8.4 V
Horn gear spline	25T, Ø5.9 mm
Gear material	Metal
Motor	Brushless
Protocol	PWM / TTL / RS-485
No-load current	4500 mA
Position sensor	Potentiometer
Case material	Aluminum alloy
Ball bearings	2BB
Working frequency	50–333 Hz
Operating temperature	−10 to 50 °C
IP rating	IP42
HBL-series advertised cycle life	Up to 1,000,000 cycles; test conditions are not specified

Voltage-Specific Torque and Speed

Parameter	At 6.0 V	At 7.4 V
Torque	26.3 kg·cm	28.2 kg·cm
Speed	0.16 s/60°	0.15 s/60°

The voltage-specific torque values are labelled as torque, without a separate rated or stall designation. Keep operating voltage within 4.8–8.4 V and operating temperature within −10 to 50 °C.

Applications

RC aircraft, UAVs and fixed-wing drones: Actuate control linkages using the compact 40 × 20 × 38 mm servo, with voltage-specific speed values for selecting the supply and motion timing.
1/8 and 1/10 RC car models: Drive steering or other mechanical linkages with metal gearing and a 25T, Ø5.9 mm output spline.
Robotics, service robots and desktop robot arms: Position joints or linkages using digital control and potentiometer position sensing.
Industrial automation: Position compact mechanisms using a brushless actuator with PWM, TTL and RS-485 listed as control interfaces.
Table-tennis serving machines: Adjust serving-machine linkages with 120° servo travel.
Medical-device mechanisms: Provide compact mechanical positioning with digital servo control and potentiometer position sensing.