Improve Gripping Operation with Multiple Torque Limit Settings

Robotic grippers are commonly used for handling parts during transportation. These grippers can be powered by pneumatic, hydraulic, or electric systems. Each option has its own advantages, but which one is truly the best choice? The answer depends largely on the specific application needs and the size of the load being handled.

While hydraulic systems offer impressive power and pneumatic systems are cost-effective, electric motors present an attractive alternative due to their consistency, energy efficiency, ease of maintenance, and integrated driver functions. In this article, we’ll explore how the torque limit function in brushless motors makes them a highly effective solution for robotic grippers.

CHALLENGE: Gradually increase gripping force to ensure secure handling of the load.

Conventional Gripper This gripper is equipped with a pneumatic device, designed to grip and transport loads to the next stage of processing. Issues with Pneumatic Grippers When transporting a heavy load of a specific mass, pneumatic grippers may fail to maintain consistent gripping force, leading to the risk of dropping the load.

SOLUTION: Utilize the Torque Limit function to progressively increase gripping force.

The Torque Limit function allows for incremental adjustments in motor torque, either increasing or decreasing it as a percentage of the motor’s rated torque. This feature is available in several of Oriental Motor's closed-loop motor systems.

Practical Application Example The Torque Limit function provides optimized multi-level gripping force, enabling gradual increases in gripping force to securely hold a load without causing damage. How It Works Torque in a motor can be increased or decreased by adjusting the current flow through its windings. The Torque Limit function monitors and controls motor current to limit torque accordingly.

How To Use Before operation, set the required torque limit values using either the driver's front panel or the MEXE02 support software. Start the motor and gently grip the load with a lower torque limit setting. If the motor exceeds the set torque limit, the TLC output will activate. Once the TLC output is activated, switch to a higher torque limit setting. If the TLC output remains active, it indicates that the load is securely gripped, allowing the transportation process to begin.

Timing Chart - Torque Limit Function

With 16 different speed and torque limit settings, the same BLE2 Series brushless motor and driver can be tailored for various loads. * *Closed-loop stepper motor systems offer up to 256 settings.

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*1: The value when the rated torque is set at 100%.
*2: A maximum error of approximately ±10% may occur between the set value and the actual torque generated, depending on factors like speed, power supply voltage, and motor cable length.
*3: The BXⅡ Series offers a speed control range of 2～4000 r/min.

Here’s a demo video introducing the BLE2 Series brushless motor and driver, along with the Alarm Monitor and Torque Limit functions.

Need help with your application?

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Looking for more insights? Explore our resources to discover how Oriental Motor's innovative solutions can enhance your robotic applications!

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