The MX-28R is a Dynamixel servomotor, with high-level control features and very precise. This model is an improvement upon the MX-28R model, with an aluminium body allowing a better heat distribution, and a new fastening system.
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.
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-900 and CM-700) 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 MX-28AR actuator
The MX series differs from the other due to features such as a more advanced features on the PID control, 360° control et high speed communication. The MX-28 servomoteur has been splited into two models: the Dynamixel MX-28AT actuator that keeps the Half duplex Asynchronous Serial Communication protocol and the TTL Level Multi Drop physical link, when the MX-28AR uses RS485 communication protocol and multi drop bus.
The actuator MX-28AR Dynamixel is an upgrade of the MX-28R model, the two enhancements are:
An aluminium body, providing an optimal heat distribution, which allows the actuator to stay cooler than the MX-28R.
The MX-28AR actuator also comes with a new fastening system, thread disks therefore eliminating the need for screws.
Technical specifications of the Dynamixel MX-28AR actuator
MCU : ST CORTEX-M3 ( ST32F103C8 @ 72MHZ,32BIT)
Position sensor : Contactless absolute encoder (12BIT,360 DEGREE)
The chart below compare the Dynamixel actuators on their performance. Servomotors are differentiated by communication type (and the MX range proposes both protocols).
The MX-28R is a Dynamixel servomotor, with high-level control features and very precise. This model is an improvement upon the MX-28R model, with an aluminium body allowing a better heat distribution, and a new fastening system.