| 摘要 |
PURPOSE:To eliminate the improper starting of an induction motor and the operation of a protector at the unnecessary time by setting the time of preventing it from restarting to longer period at high atmospheric temperature time and to shorter period at low atmospheric temperature time. CONSTITUTION:When a temperature in a room such as a refrigerator becomes higher than the set temperature, the output of a comparator 2 becomes ''1'', a controller 5 becomes ON by the AND condition with the Q output of a flip- flop 4, and a single phase induction motor 6 starts operating. When the resistance value of a positive temperature coefficient thermistor 9 increases, a current to an auxiliary winding 8 becomes small. When the temperature in the refrigerator becomes lower than the set temperature, the output of the comparator becomes ''0'', the motor 6 is stopped, and the flip-flop 4 and a timer 15 are reset. At this time, when the atmosheric temperature is low and an atmospheric temperature detecting switch 14 is closed, the flip-flop 4 is set by the output of the timer after a short time is elapsed, and when atmospheric temperature is high, the flip-flop 4 is set by the timer 14 after the long time is elapsed, thereby becoming the state capable of being restarted. |
