• Dark green and gold DHV840 servo in upright three-quarter view, showing the splined shaft and slotted mounting tabs.
  • DHV840 servo with shaft face toward the viewer, showing the red HV CORELESS label, four screws, and mounting slots.
  • Green and gold servo with a black circular perforated horn mounted on top and a three-color cable exiting the side.
  • Servo side profile showing the gold HV TITANIUM coreless digital panel, green housing, upper shaft, and left cable.
  • DHV840 servo lying diagonally, with the exposed splined shaft, red model label, gold housing, and mounting slots visible.
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Kpower DHV840 Coreless Servo Motor, 40 kg·cm Stall Torque at 7.4 V for R/C Models and Robots

Kpower DHV840 Coreless Servo Motor, 40 kg·cm Stall Torque at 7.4 V for R/C Models and Robots

Kpower

$139.00 USD
$139.00 USD
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Overview

The Kpower DHV840 is a DHV Series coreless servo motor for R/C cars, aircraft, robotic mechanisms, and other controlled-positioning tasks. It combines steel gears with a CNC-machined 7075 aluminum housing, a splined output shaft, and mounting tabs. Specified travel is 120° ± 2°, with stall torque of 40.0 ± 0.20 kg·cm at 7.4 V. Its three-wire lead provides the electrical connection.

Features

  • Coreless motor with steel gears.
  • CNC-machined 7075 aluminum housing.
  • Splined output shaft with a central threaded hole for securing an attached linkage component.
  • Mounting tabs at both ends of the housing.
  • Three-wire lead with 22 AWG PVC wiring.
  • 900–2100 μs signal range, 2 μs dead band, and 50–333 Hz refresh frequency.

Specifications

Parameter Value
Brand Kpower
Model DHV840
Series DHV Series
Gear material Steel
Signal range 900–2100 μs
Case material and construction CNC-machined 7075 aluminum
Motor type Coreless
Operating temperature −10 °C to +50 °C
Dead band 2 μs
Travel angle 120° ± 2°
Refresh frequency 50–333 Hz
Dimensions 40 × 20 × 43 mm
Weight 73 g ± 1 g
Wire gauge and insulation 22 AWG PVC
Output shaft Splined, with central threaded hole
Mounting Tabs at both ends of the housing
Electrical lead Three-wire

Performance by Test Voltage

Parameter At 6.0 V At 7.4 V
No-load speed 0.21 ± 0.01 s/60° 0.18 ± 0.01 s/60°
Stall torque 34.0 ± 0.20 kg·cm 40.0 ± 0.20 kg·cm
No-load current 500 ± 30 mA 800 ± 30 mA
Stall current 3500 ± 40 mA 4200 ± 50 mA

Applications

  • R/C car steering: Drive steering linkages through the splined output shaft, with mounting tabs for attachment to a suitable chassis bracket.
  • R/C aircraft control: Actuate control-surface linkages using the specified 120° ± 2° servo travel.
  • Robotic mechanisms: Position articulated linkages using the coreless motor and steel gear train; the voltage-specific torque and speed figures support actuator selection.
  • Smart-home mechanisms: Move small position-controlled linkages within the specified travel range.
  • Medical-device mechanisms: Provide mechanical positioning for device linkages using the tab-mounted housing and splined output shaft.

Documents

Product Video

Visual Details

Product Video

Application Examples

Kpower DHV840 servo with splined shaft, mounting tabs, and application labels
The servo is labeled K-power DHV840. The DHV840 has a three-wire lead exiting the housing.
R/C buggy, crawler, truggy, and monster truck application examples
The servo application panel lists buggy cars under R/C cars and trucks. The servo application panel lists RC crawlers under R/C cars and trucks.
General servo application collage with multiple servo designs
General servo application collage covering robotics, R/C models, automation, agriculture, vehicles, electronics, and drones
General Kpower drive and control application grid
Kpower application grid covering robotics, smart homes, automation, RC models, drones, agriculture, and electronics

Setup and Use

Generic servo reference mapping 0.5–2.5 ms pulses to −90° through 90° angles
Servo-control reference mapping 0.5–2.5 ms pulses to −90° through 90° output angles

Specifications and Performance

CLS88WP 7.4 V torque, speed, current, and operating-duration chart
CLS88WP 7.4 V speed and current versus torque chart with color-coded operating-duration limits

Features and Design

DHV840 feature panel with CNC aluminum case, coreless motor, and 8.4 V label
The DHV840 is identified as a DHV Series servo. The DHV Series servo uses a coreless motor.
Custom servo development graphic with PWM, TTL, RS-485, and CAN labels
Custom servo development graphic listing customization areas and PWM, TTL, RS-485, and CAN protocols
Generic exploded servo assembly with housings, gears, seals, motor, and drive PCB
Exploded servo assembly with labeled housings, gears, seals, motor, potentiometer, and drive PCB

Options and Model Comparison

Servo horn shapes labeled Flat, Cross, Round, Star, and Single
Five servo horn shapes labeled Flat, Cross, Round, Star, and Single

Interfaces and Connections

Generic three-wire connector guide labeling brown ground, red Vcc, and orange signal
Three-wire servo connector diagram identifying brown ground, red Vcc, and orange signal

Additional Product Details

ODM development workflow from requirements through testing and production
ODM service workflow from requirements assessment through design, sample testing, and mass production

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