Industrial control — Shunted-armature connection for a D-C shunt motor

THERE are many operations in applications where d-c shunt motors are used where it is necessary to slow down the rotating system in order to perform certain functions. Many typical examples are found in machine-tool work, such as cross-feeding of a tool, milling-cutter slow-down for sharp corners, accurate positioning of tool to work, slowdown of a grinding wheel for dressing. Other examples are found in the slowing down of a printing machine for the purpose of matching colors and occasionally to obtain a threading speed in a textile range drive.