The invention relates to a low-power single-phase condenser motor, which comprises a
stator core, a main phase winding, a sub-phase winding and a condenser, wherein the space electrical angle difference between the main phase winding and the sub-phase winding which are arranged on the
stator core is 90 degrees; and the sub-phase winding is connected with the condenser in parallel and then is connected with the main phase winding in series to be connected to a power supply. A method for adjusting
capacitance and turn number of the motor comprises the following steps: 1) wire embedding is carried out on the
stator core, a rotor is used for manufacturing a two-phase winding motor prototype, the space electrical angle difference of two-phase windings which are arranged on the stator core is 90 degrees, the motor is operated symmetrically at a rated
operating point, the effective turn number of the one-phase winding is Wm, the
voltage of the connected power supply is Um, and the conductance g and the electrical
susceptance b of the phase loop at the time are measured; and 2) the effective turn number Wm' of the main phase winding, the effective turn number Wa' of the sub-phase winding, and the
capacitance C' are regulated to be as following formulas: Wm'=Wm*UN / (Um(1+(g / b)<2>)<0.5>); Wa'=Wm* (g / b)*UN / (Um(1+(g / b)<2>)<0.5>); C'=(b+b<3> / g<2>) / (2Pi*f*UN<2> / Um<2>(1+(g / b)<2>))); and in the formulas, the UN refers to the rated
voltage of the motor, and the f refers to the rated frequency of the motor. Compared with the traditional technology, in the design, the winding process is improved, the computational
workload is reduced, and better performance is achieved.