Kikobot Motion — KH Series

KH Series integrated harmonic actuators

Integrated joints with a motor, harmonic reducer, encoder, drive electronics and high-speed network communication in one housing.

Evaluate a KH actuator Download datasheet

Compare models

Compare KH actuator frame sizes

Each size is available in three gear ratios, with or without a brake. Compare rated torque, peak torque and weight to choose a starting point for your joint.

KH-14

For wrists, grippers and compact joints where space is tight.

Rated torque: 6.8–14 Nm
Peak torque: 70 Nm
Approx. weight: 0.9 kg

KH-17

For mid-size arm joints on cobots and light manipulators.

Rated torque: 12–51 Nm
Peak torque: 143 Nm
Approx. weight: 1.36 kg

KH-20

For elbow and shoulder joints carrying higher loads.

Rated torque: 20–64 Nm
Peak torque: 191 Nm
Approx. weight: 2.03 kg

KH-25

For base joints, hips and legs carrying heavier loads.

Rated torque: 38–140 Nm
Peak torque: 369 Nm
Approx. weight: 2.75 kg

Specifications common to every KH model

Voltage: 24–48 V DC
Gear ratios: 30:1 / 50:1 / 100:1
Encoder: 15-bit multiturn
Communication: Controller Area Network Flexible Data Rate (CAN FD), 5 Mbps

Ratio-level selection

Compare the speed and torque trade-off

Use this table for initial selection. Rated and peak values are not interchangeable; peak torque is the published five-second momentary rating.

KH-14

30:1

Rated torque: 6.8 Nm
5 s peak torque: 17 Nm
Rated speed: 110 RPM
Peak speed: 280 RPM
Rated power: 83 W

50:1

Rated torque: 9 Nm
5 s peak torque: 46 Nm
Rated speed: 70 RPM
Peak speed: 168 RPM
Rated power: 66 W

100:1

Rated torque: 14 Nm
5 s peak torque: 70 Nm
Rated speed: 35 RPM
Peak speed: 84 RPM
Rated power: 51 W

KH-17

30:1

Rated torque: 12 Nm
5 s peak torque: 30 Nm
Rated speed: 110 RPM
Peak speed: 231.7 RPM
Rated power: 147 W

50:1

Rated torque: 34 Nm
5 s peak torque: 91 Nm
Rated speed: 70 RPM
Peak speed: 139 RPM
Rated power: 249 W

100:1

Rated torque: 51 Nm
5 s peak torque: 143 Nm
Rated speed: 35 RPM
Peak speed: 69.5 RPM
Rated power: 187 W

KH-20

30:1

Rated torque: 20 Nm
5 s peak torque: 50 Nm
Rated speed: 110 RPM
Peak speed: 183 RPM
Rated power: 244 W

50:1

Rated torque: 44 Nm
5 s peak torque: 127 Nm
Rated speed: 70 RPM
Peak speed: 109.8 RPM
Rated power: 323 W

100:1

Rated torque: 64 Nm
5 s peak torque: 191 Nm
Rated speed: 35 RPM
Peak speed: 54.9 RPM
Rated power: 235 W

KH-25

30:1

Rated torque: 38 Nm
5 s peak torque: 95 Nm
Rated speed: 110 RPM
Peak speed: 183 RPM
Rated power: 405 W

50:1

Rated torque: 72 Nm
5 s peak torque: 242 Nm
Rated speed: 70 RPM
Peak speed: 109.8 RPM
Rated power: 405 W

100:1

Rated torque: 140 Nm
5 s peak torque: 369 Nm
Rated speed: 35 RPM
Peak speed: 54.9 RPM
Rated power: 405 W

Values are typical at 25 °C ambient and are subject to change. Confirm thermal performance, external-load capacity and suitability for the complete motion profile before design-in.

Key features across every KH actuator

24–48 V DC input

Runs on the supply you already have on the machine.

Hollow shaft

Route cabling straight through the joint — no external looms.

Gear-ratio options

30:1, 50:1 or 100:1 — or a ratio specified for your load case.

Daisy-chain wiring

Link joints in series and reduce the wiring down the arm.

High-speed CAN FD

5 Mbps communication for tight, responsive motion.

How it works

How a KH actuator is built

A motor, harmonic reducer, encoder and drive electronics share one housing. Bolt the finished joint to the link, run one cable, and the control loop is already closed inside the unit.

Exploded view of a Kikobot KH harmonic actuator

Frameless BLDC motor

High torque density in a short axial stack.

Harmonic reducer

30:1, 50:1 or 100:1 ratio, chosen per joint.

15-bit multiturn encoder

Absolute position held through a power cycle.

Integrated field-oriented control (FOC) driver

Current loop closed inside the joint, not in a cabinet.

CAN FD interface

5 Mbps daisy chain — one cable down the arm.

Applications

Applications for KH actuators

Cobots

Collaborative arms that need smooth, compliant motion at every joint.

Humanoids

High torque density in a package light enough to carry itself.

Bionic limbs

Quiet, smooth actuation close to the body.

Exoskeletons

Assistive force that tracks the wearer without fighting them.

Performance evidence

Read every rating in its test context

The public datasheet supports initial comparison. The application evaluation closes the gap between a component rating and performance inside your machine.

Published rating basis

The current datasheet reports typical values at 25 °C ambient. Peak torque is identified as a five-second momentary rating.

Precision specification

The published specification lists backlash of no more than 40 arcseconds and repeat position accuracy of ±0.01 mm across the range.

Validate the real duty

Continuous torque, thermal behaviour, external loads and life depend on the joint design and duty cycle, so they are reviewed during evaluation.

Integration resources

Know what is public and what to request

We identify the available public evidence separately from design-in material whose availability and revision must be confirmed with engineering.

Download

Public now

KH Series datasheet with ratio-level speed, torque, electrical, precision and weight specifications.

Confirm availability

Request for design-in

Mechanical drawings or CAD, connector and pinout information, CAN-FD integration details and controller guidance.

Scope with engineering

Evaluation plan

Target joint load, motion profile, voltage, ratio, brake, environment, quantity and the evidence required for the decision.

Download the public datasheet Request design-in resources

The evaluation proposal confirms sample availability, current pricing, lead time, integration resources, warranty terms and the performance questions to close before design-in.

Support and delivery

For machine builders

Evaluate KH for your next joint

Share the torque, speed, voltage, ratio, brake, envelope and expected quantity. Kikobot will recommend a starting model and the relevant integration resources.

Request an actuator evaluation Download datasheet