Single-phase motor capacitor series and parallel three-speed circuit

During speed regulation, the main and auxiliary windings can be connected in series to achieve voltage reduction and speed regulation. If the capacitor is connected in parallel to the auxiliary winding LA winding, it will shift the phase of the current in LA. By changing different capacitances, different speeds can be obtained. At high speed, switches S1 and S2 are in the position shown in the figure; at medium speed, S1 is connected to ②, and S2 is turned to the ④ position; at low speed, S1 is connected to ②, and S3 is turned to ⑤. The C1 capacity in the circuit should be smaller than the C2 capacity.