Understanding How Three-phase Electric Motors Work

Chapter 35 - More Principles of Industrial Instrumentation (Animated)

Note how the lights appear to “move” from left to right as the energization sequences moves from A to C. After a few cycles of ABC, two of the wires are crossed to reverse phase sequence. This has the result of reversing the apparent direction of motion! It matters not which two phases are reversed. In this animation, I reverse phases A and B, but I could have just as well swapped phases B and C, or phases A and C, and created the exact same effect.