| 摘要 |
PURPOSE: To protect wiring of a motor from overheating by controlling a compressor so as to decrease its rotational speed by a specific rotational speed when a refrigerant delivery pressure of the compressor is increased relating to an upper limit delivery pressure which is the refrigerant delivery pressure corresponding to an upper limit value of refrigerant delivery temperature of the compressor. CONSTITUTION: A compressor 2 of constituting a heat pump cycle is rotated to be driven by a variable speed motor provided integrally with this compressor to be fed with power through an inverter device 11 of a control device 9. In the control device 9, based on a detecting temperature To of an outside air temperature sensor 15, an upper limit delivery pressure Ps corresponding to an upper limit value of delivery temperature of the compressor 2 is calculated. When a detecting pressure Pd of a pressure sensor 13, detecting a delivery pressure of the compressor 2, exceeds the pressure Ps, a compressor rotational speed Nc is decreased by a specific rotational speed ΔN1, to output, in the case of the pressure Pd lower than a command rotational speed No, a control signal of increasing by the specific rotational speed ΔN2 to the inverter device 11. |
