Read the full article on PackagingDigest.com.
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 from PackagingDigest.com highlights the three most popular methods for controlling step and servo motors used in positioning conveyors: pulse control, velocity control with analog input, and network control (distributed control).