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Pack Expo International is the world’s largest packaging and processing show, located at McCormick Place in Chicago, IL from November 6-9, 2016. Visit Applied Motion Products in booth # E-10319 to see the StepSERVO closed loop stepper products in action, along with our latest offerings of drives and integrated motors that support EtherNet/IP and EtherCAT.

Most conveyor applications run at either a constant or variable speed, and therefore require only velocity control from the conveyor’s main drive motor. But positioning conveyors – like edge-belt conveyors for PC board assembly and positioning conveyors used in automated checkweighers – need to do more than just velocity control. The main drive motor needs to start and stop the conveyor with precision. The level of precision can range from moderate to fairly high. This level of positioning control requires more than your average DC or AC motor used for velocity control. Step motors and servo motors are the best solutions because of their precise positioning capabilities. This article highlights the three most popular methods for controlling step and servo motors used in positioning conveyors.

StepSERVO closed loop integrated motors with the Step-Servo Quick Tuner software and built in Q Programmer are well suited for labeling, packaging, and food & beverage applications. StepSERVO integrated motors provide closed loop servo control of position, velocity and torque using high torque step motors. The result is higher acceleration for faster machine cycles, and the motors run cooler and quieter than open loop stepper systems.

This Did You Know? article covers the process of closing a simple analog position loop using a Q program and an Applied Motion stepper drive with differential inputs.

Some step motor applications require an operator to adjust a rotary valve or air vane and cannot use a homing sequence on power-up. The operator just needs to turn a control knob and have the load move to the correct location.