• Black and gold HBL300 servo in front view, with exposed splined shaft, mounting tabs, and labeled housing.
  • Angled HBL300 servo with a black four-arm horn fitted on top and mounting slots visible at both ends.
  • Elevated diagonal view of the black and gold servo, showing the bare splined shaft, HBL300 label, and mounting tabs.
  • HBL300 servo with coiled lead, four differently shaped horns, screws, and black mounting hardware arranged beside it.
  • Two HBL300 servo views with coiled leads, showing a bare output shaft on the left and a fitted four-arm horn on the right.
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Kpower HBL300 Brushless Servo Motor, 30.6 kg·cm Stall Torque at 7.4 V, for RC Models and Robotics

Kpower HBL300 Brushless Servo Motor, 30.6 kg·cm Stall Torque at 7.4 V, for RC Models and Robotics

Kpower

$127.00 USD
$127.00 USD
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Overview

The Kpower HBL300 is an HV brushless servo motor for RC models, robotics and automated mechanisms. It combines metal gears, an aluminum middle case and potentiometer position sensing, with stall torque of 30.6 kg·cm at 7.4 V and a no-load speed of 0.15 s/60° at that voltage. Its listed operating range is 4.8–8.4 V, with PWM, TTL and RS-485 protocols.

Features

  • High-torque brushless motor with high-precision metal gears.
  • Aluminum alloy and plastic case construction, including an aluminum middle case.
  • Potentiometer position sensing and two ball bearings (2BB).
  • 25T output spline with a diameter of 5.82 mm.
  • 120° travel angle, described as customizable.

Specifications

Voltage-Dependent Performance

Parameter At 6.0 V At 7.4 V
Stall torque 28.5 kg·cm 30.6 kg·cm
No-load speed 0.16 s/60° 0.15 s/60°

Mechanical and Electrical Specifications

Parameter Value
Model HBL300
Servo type HV brushless servo; high-torque classification
Rated torque 7.5 kg; torque unit requires clarification
Weight 65 g
Dimensions 40 × 20 × 39.4 mm
Travel angle range 120°; customizable
Operating voltage 4.8–8.4 V
Horn gear spline 25T, Ø5.82 mm
Gear material Metal
Motor Brushless
Protocols PWM, TTL, RS-485
No-load current 4500 mA
Position sensor Potentiometer
Case material Aluminum alloy + plastic; aluminum middle case
Ball bearings 2BB
Working frequency 50–333 Hz
Operating temperature −10 to 50 °C
IP rating IP42
HBL-series cycle-life claim Up to 1,000,000 cycles; test conditions not specified

Applications

  • RC aircraft and VTOL fixed-wing drones: Actuate control linkages using the brushless drive and metal gear train.
  • 1/8- and 1/10-scale RC cars: Operate steering linkages where the voltage-dependent torque and speed suit the mechanism.
  • Robotics and service robots: Position joints and linkages using potentiometer feedback and the listed control protocols.
  • Industrial automation, industrial vacuum cleaners and drone docks: Position movable mechanisms with a 120° travel range.
  • Table-tennis serving machines: Adjust mechanical positioning through the geared servo output.
  • Medical-device mechanisms: Provide positional actuation through the brushless motor and geared output.

Documents

Product Videos

Visual Details

Product Video

Features and Design

HBL300 HV brushless servo beside a general custom-servo capability panel
The HBL300 is labelled as an HV brushless servo.
HBL-series brushless motor, metal gear and cycle-life feature panels
The HBL series claims a lifespan of up to one million cycles, without stated test conditions. The HBL series uses a high-torque brushless motor.
Custom-servo development graphic with shaft, gear, housing and connector examples
Custom servo development graphic with shaft, gear, housing and connector examples

Options and Model Comparison

Comparison table for HBL045, HBL090, HBL150, HBL200 and HBL300 servos
The comparison table specifies dimensions of 40 × 20 × 39.4 mm for HBL045, HBL090, HBL150, HBL200 and HBL300. The comparison table specifies a weight of 65 g for HBL045, HBL090, HBL150, HBL200 and HBL300.

Specifications and Performance

HBL300 servo, metal gears and voltage-dependent torque and speed specifications
The HBL300 torque is 28.5 kg·cm at 6.0 V. The HBL300 torque is 30.6 kg·cm at 7.4 V.
General servo selection panel covering angles, speeds, voltages and dead bands
General servo selection panel listing rotation angles, speeds, voltage categories and dead bands
CLS88WP speed and current versus torque chart at 7.4 V
CLS88WP speed and current versus torque chart at 7.4 V with operating-duration zones

Additional Product Details

Servo-horn shapes labelled Flat, Cross, Round, Star and Single
Five servo-horn shapes labelled Flat, Cross, Round, Star and Single
General ODM workflow from needs evaluation through sampling and mass production
ODM service workflow from needs evaluation through design, sampling and mass production

Setup and Use

Generic pulse-width timing diagram with five example servo angles
Servo pulse-width timing diagram with five example shaft angles
Exploded servo anatomy and general component-selection checklist
Exploded servo anatomy with labelled components and a general selection checklist

Interfaces and Connections

Generic three-wire connector diagram with brown ground, red supply and orange signal
Three-wire servo connector diagram identifying brown ground, red supply and orange signal

Application Examples

Kpower drive-and-control application collage spanning robotics, automation and RC models
Kpower application collage covering robotics, automation, RC models, drones and other industries

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