What is the difference between XM and XH models of DYNAMIXEL?

This is a common question from interested users when reviewing certain models in the DYNAMIXEL-X series- the “XM” models seem to share very similar model naming and specifications with “XH” models. What is the reason for this, and what is the difference between them?

Let’s take a look at the breakdown of the model names of DYNAMIXEL-X series:

As we can see above, the model names in DYNAMIXEL X-series are generated according to a formula which includes sections to indicate a product category, size, voltage, gear ratio, and interface (physical communication layer). The “XM” and “XH” distinction fall into two separate product categories- “High Performance” and “Mid-Level Performance”. What does this mean, practically speaking?

XM Models: XM models are one of the most popular choices by ROBOTIS users for their mix of high torque, variety of sizes, and lower cost. Many of the “XM” models also show ratings for slightly higher torque than the equivalent “XH” model. Why then, are these characterized as “Mid Level Performance”?

The heart of any servo is a DC motor- the driving force behind the gears, sensors, and other components working to provide motion inside of a servo. “XM” models are built with a standard coreless DC motor sourced by ROBOTIS for use inside DYNAMIXEL XM models. The standard DC motor works well for the wide range of general uses in which the servos can be applied, but does not offer much further.

XH Models: XH models are also a popular choice for users and offer some specific advantages over the XM models of DYNAMIXEL-X series. You may also notice that XH models feature slightly lower overall torque than the equivalent XM model- what makes these models “High Performance”?

The XH models are built exclusively using high-quality Maxon brand motors- known for their efficiency, high runtimes, and overall quality. Models of the DYNAMIXEL XH-series bring these strengths into their operation with longer overall lifetime, quieter operation, and the option for some models to use 24V power supplies.

To distinguish these, DYNAMIXEL-XH models with “W” in the second half of their name are rated for 12V. DYNAMIXEL-XH models with “V” in the second half of their name are rated for 24V systems.

Regardless of your application, there is likely a model in the DYNAMIXEL-X series with features to power your next project. Explore more information about these models on the ROBOTIS.US online shop, and let us know if you have any questions!