JPS57199459A - Single-phase induction motor - Google Patents

Abstract

PURPOSE:To facilitate winding, and to reduce the starting currents of the motor by dividing a main coil into plural sections and making the sectional area the same as the original sectional area. CONSTITUTION:The main coil 3 is divided into two conductors 31, 32, and formed by enamel wires through which the composing sectional areas of these conductors 31, 32 correspond to the original area of the main coil 3. In this case, each conductor resistance of the main coils 31, 32 is 2R, and the conductor resistance of the main coil 3 connected in parallel is R. Consequently, when either one of the main coils 31, 32 is used, the starting currents are inhibited by employing only the main coil 31 until the predetermined number of revolution after starting the motor because the resistance value is large, and desired output is obtained by using the both main coils 31, 32 when the number of revolution set or higher. Accordingly, since a winding conductor is divided and the diameters can be reduced, the coils can easily by passed when the winding of the inlet section 12 of a throttle 10, and the damage of an enamel film is prevented.