Robot joint motors

First calculate the static load the joint carries and set the rated torque, then leave peak torque margin for sudden loads during motion. In walking robots, peak torque often reaches up to three times the rated value. Weight matters as much as torque, because every gram added at the end of a limb comes back as moment at the joint above.

You can, and at the prototype stage it can make sense for stock and service. But fitting a hip motor to light joints like the neck or wrist adds unnecessary weight, and the other way round the motor falls short. When moving to series production, we recommend choosing separately for each joint.

In the AK series the driver is built into the motor and the body is solid. In the AKH series the shaft is hollow, so cables and an air line can pass through the center of the joint. The hollow shaft prevents cable winding and fatigue, especially in joints with many cables, like the hip and ankle.

If force control and backdrivability matter, low-ratio or quasi-direct-drive models are a better fit, because a low ratio lets the motor feel external forces more easily. For joints that need high torque and do not need backdrivability, a high gear ratio gives the same torque with a smaller motor.

Most models in the catalog are in our stock in Turkey, and products in stock are dispatched within three business days. For models not in stock and volume projects, confirm the lead time with our corporate sales team.