I just disassembled the shifter assembly in a washing machine. It uses a synchronous 120VAC gear motor. The motor says "CW/CCW Z.P." It has two leads for the AC power and no other inputs.
I discovered that the direction sometimes reverses if I allow the motor to stop, then quickly cycle the input power, then re-apply the power. However, this is not reliable, as sometimes it reverses and sometimes it doesn't.
How is this motor being reversed by the washing machine control board? There must be a reliable method, otherwise the shifter arm assembly would be damaged.