Patent ID: 7515029
Filing Date: 2009-04-07
Classification: H01H,H02K,H02P

Abstract:
1. A starter of single-phase induction motor having main winding and auxiliary winding energized by alternating current power source, comprising: a casing, a positive characteristic thermistor connected in series to the auxiliary winding, an auxiliary positive characteristic thermistor connected parallel to the positive characteristic thermistor and a snap action bimetal, the snap action bimetal connected in series to a series circuit of auxiliary winding and positive characteristic thermistor for sensing the heat from the auxiliary positive characteristic thermistor and turning off when reaching a set temperature, and an enclosed compartment accommodated in the casing, for enclosing the snap action bimetal and auxiliary positive characteristic thermistor; wherein the snap action bimetal is composed of a movable contact plate for oscillating a movable contact point, a bimetal, and a plate spring of semicircular section interposed between first support point of the movable contact plate and second support point of the bimetal.