Dynamixel RX-28 Actuator
Dynamixel RX-28 Actuator

Dynamixel RX-28 Actuator

Robotis | A-000000-00536
The Dynamixel RX-28 actuator is a servomotor offering balanced performances making it one of the most popular actuator of the Dynamixel range. The proposed model is the RX-28 HN07-N101.
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The Dynamixel servomotors

Dynamixel Servomotors main features
  • All-around assembling structure: you can make robots of various forms as using different option frames.
  • Powerful feedback : It can read current position of Dynamixel or speed as well as various information such as internal temperature, supply voltage, target position.
  • Simple connection structure: Wiring is simple because it is linked by Daisy Chain.
  • Alarm function: When internal temperature, torque, supply voltage etc. escaped appointed range, it gives feedback about that situation. Also in such emergency situation, it flash LED or be Torque off.
  • Compliance configuration: It can configure the compliance to control the position.
  • Torque set up : Torque can be set up by 1023 steps from maximum Torque to free run state.
  • Low-electric current/high voltagedrive : Its efficiency is high because it runs by high voltage and it improves stability of robot system that is formed by Dynamixel because current consumption is low.
  • Status LED : It has LED that can check state of the Dynamixel.
  • Drive by network: Dynamixels have unique ID and are controlled by Packet communication on a bus. It supports network of TTL, RS 485, and CAN etc. according to model.

Dynamixel actuators are controlled by Packet communication

This video illustrates the capabilities and the existing application for Dynamixel servomotors:

Programming the Dynamixel servomotors

The servomotors have to be linked to a main controller (CM-700, CM-5, CM-510 or CM-530) to be commanded. The progams are made with RoboPlus, which allow really easy programmation, without much previous knowledge.

The most recent main controllers support embedded C and there is a SDK for you to developp your own applications.

The Dynamixel RX-28 actuator

The Dynamixel RX-28 exhibit balanced performances. This is the most obiquitous actuator.

Technical specifications of the Dynamixel RX-28 actuator

  • Weight : 72g
  • Dimension : 35.6mm x 50.6mm x 35.5mm
  • Resolution : 0.29°
  • Gear Reduction Ratio : 193 : 1
  • Stall Torque : 3.77N.m (at 18.5V, 1.9A)
  • No load speed : 85rpm (at 18.5V)
  • Running Degree
    • 0° ~ 300°
    • Endless Turn
  • Running Temperature : -5℃ ~ +80℃
  • Voltage : 12V~18.5V (Recommended Voltage 14.8V)
  • Command Signal : Digital Packet
  • Protocol Type : RS485 Asynchronous Serial Communication (8bit,1stop, No Parity)
  • Link (Physical) : RS485 Multi Drop Bus
  • ID : 254 ID (0~253)
  • Communication Speed : 7343bps ~ 1 Mbps
  • Feedback : Position, Temperature, Load, Input Voltage, etc.
  • Material : Full Metal Gear, Engineering Plastic Body
  • Standby current : 50 mA

Technical documentation of the Dynamixel RX-28 actuator

Dimensions of the Dynamixel RX-28 actuator
Dimensions of the Dynamixel RX-28 actuator
Technical documentation of the Dynamixel RX-28 actuator
Technical specifications of the Dynamixel RX-28 actuator

Comparing the various Dynamixel actuators

This document offers an overview on the characteristics of all the Dynamixel servomotors.

Comparison table between all Dynamixel servomotors robotis
Comparison between all Dynamixel servomotors

The chart below compare the Dynamixel actuators on their performance. Servomotors are differentiated by communication type (and the MX range proposes both protocols).

comparison torque / speed for Dynamixel servomotors robotis


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