This article provides an in-depth comparison between Direct Drive (DD) motors and harmonic rotary actuators, covering their transmission principles, advantages and disadvantages, and typical application fields.

Understanding the Differences Between Direct Drive Actuators, Harmonic Reducers, and Integrated Precision Rotary Actuators In precision motion control systems, Direct Drive Actuators, harmonic reducers, and rotary actuators are three important technologies used for generating and controlling rotary motion. Although these technologies are often discussed together, they serve completely different roles in a motion system.

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DD motor, full name Direct Drive motor, is a motor that directly drives the load without using reduction devices such as gears, belts or ball screws. Its working principle is based on high torque output, allowing it to be directly connected to the moving equipment, thereby eliminating the need for intermediate connection parts such as fasteners, gearboxes and belts.