Inductance contactless starter

An inductive contactless starter for single-phase AC motor, comprising a current inductor and a triac; wherein, one terminal of secondary coil of said current inductor is connected to the gate electrode of said triac, the other terminal is both connected to the first electrode of said triac and the terminal of secondary winding of the motor, and the two terminals of primary coil of said current inductor are connected to the motor and the power supply. By sampling relevant current signals with said current inductor, the invention can control heat loss of the current sampling system effectively down to milliwatt level (i.e., the starter is a "zero power loss"starter for single-phase AC motors), and thereby improve energy efficiency greatly; in addition, the invention has a simple circuit and fewer components and is reliable, improving reliability of the electric starter system while delivering electric starting function.