Single-phase motor winding tap L-1 connection three-speed circuit

The picture shows the L-1 connection three-speed circuit diagram. The speed control switch SA adds a medium speed gear. When SA is set to medium speed "II", part of the turns of the speed regulating winding are connected in series to the auxiliary winding LA, and the other part of the turns are connected in series to the main winding LR, so that the motor runs at a medium speed that is neither fast nor slow. The characteristic of the L-1 connection method is that the main winding LR and the speed regulating winding LD are distributed in the same slot and have the same phase, and all windings can participate in the operation of high, medium and low speeds.