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Don't Take our Word for It that StepSERVO™ Motors Generate More Torque

by Eric Rice

Watch the video that compares equally sized motors – one open loop and one closed-loop. StepSERVO™ closed-loop integrated motors outperform traditional open loop step motors in many ways, including torque. Torque is important for today’s high-throughput production machinery that requires motors to operate reliably with high acceleration and deceleration rates.

By integrating a high-resolution incremental encoder and closed-loop servo firmware, StepSERVO™ Integrated Motors create peak torques up to 50% higher than open loop motors. And because closed-loop motors only draw current when needed, they operate cooler and quieter than open loop motors that continuously supply current to the motor whether or not the load demands torque.

A side-by-side comparison of two motors with the same size frame and stator length proves this point. The only difference between the two motors is that one motor is run open loop and the other is run closed-loop using StepSERVO™ technology.

In the test each motor is commanded to make identical point-to-point moves, accelerating to a fixed speed for a brief time and then decelerating to a stop. As acceleration rates increase, the open loop motor starts to lose steps because of insufficient torque. The closed-loop motor, on the other hand, continues to accurately reach its position, even when operating with the more aggressive move profile.

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