To improve the energy efficiency in a motor starting device.
The motor starting device having a main winding and an auxiliary winding is provided with a first positive temperature coefficient thermistor 104, a semiconductor switch 105 connected to the first positive temperature coefficient thermistor 104 in series, and a second negative temperature coefficient thermistor 106 connected to the first positive temperature coefficient thermistor 104 and the semiconductor switch 105 in parallel and controlling turnon and turnoff of the semiconductor switch 105. A thermal loss in the second negative temperature coefficient thermistor 106 is reduced, and a power consumption in the starting device is reduced by covering at least a portion of an outer circumference of the second negative temperature coefficient thermistor 106 with a thermal insulation layer.
IIZUKA TATSUYUKI
Hiroki Naito
Daisuke Nagano