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Direct Drive vs Rotary Gear Motor: A Quantification of Design Advantages

For decades, geared servo motors have been one of the most common tools in the industrial automation toolbox. Offering excellent performance for positioning, velocity matching, electronic camming, winding, tensioning, and tightening applications, geared servo motors efficiently match the power of a servo motor to the load. This raises the question: Is a geared servo motor the pinnacle of rotary motion technology, or is there a better solution?

This document examines direct drive motor technology, compares it in terms of cost and performance with that of a rotary gear motor in an application simulation, then identifies the best applications for direct drive motors.

• Learn about the effects of backlash and torsional stiffness and how they can degrade performance in a servo system.
• Analyze performance results of a geared servo motor vs. a direct drive motor operating a rotary indexing table under identical conditions.
• Identify the best applications where you can benefit from the use of direct drive motor technology.

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