4-3. To Rotate by Square-Wave Drive

The rotor can be continuously rotated by switching the direction of the current flowing through the coil in synchronization with the rotation.
There are 6 patterns of current flow: U phase -> V phase, U phase -> W phase, V phase -> W phase, V phase -> U phase, W phase -> U phase, W phase -> V phase.
(Switch the direction of current every 60 degrees)