| 摘要 |
PURPOSE:To set torque in the optimum condition to operate the compressor in the range of low frequency while planning low input by changing the input voltage of the compressor in response to the load (outdoor side heat exchanger temperature) of the compressor at the time of low frequency cooling operation. CONSTITUTION:In an operation control apparatus, the numeral 11 shows a temperature detecting circuit including a thermistor, the numeral 12 a resistance circuit for a set temperature value, the numeral 13 a microcomputer, the numeral 14 a power transistor device, the numeral 15 a power source device including a power source, a fuse, a noise filter, a diode bridge and the like and the numeral 16 a three-phase compressor. At first, when an operating frequency and the temperature value of an outdoor side heat exchanger are read in and the comparative judgement of the operating frequency and the set frequency is performed to recognize the same frequency, the rotating speed control II (f-V characteristics II) of the compressor is selected and the power transistor device is driven in only the case where the comparative judgement of the read-in temperature value and the set temperature value is performed and the read-in temperature value is larger than the set temperature value. In the other case, the rotating speed control of the compressor I (f-V characteristics I) is selected and the power transistor device is driven. |
