Refrigeration cycle device with motor speed estimator

A refrigeration cycle device comprising

• a refrigeration cycle circuit that includes a compressor including an electric motor;
• a condenser;
• an expansion valve;
• and an evaporator;
• the compressor, the condenser, the expansion valve, and the evaporator being connected to each other,
• wherein
• a working fluid containing 1,1,2-trifluoroethylene and difluoromethane is used as a refrigerant sealed in the refrigeration cycle circuit,
• the refrigeration cycle device further includes an electric motor driving device that drives the electric motor,
• the electric motor driving device includes a rotational speed estimator,
• the electric motor driving device includes an electric current detector that detects an electric current input to the electric motor, and
• the electric motor driving device is configured to stop supplying electric power to the electric motor when a change rate of a detection value detected by the electric current detector is equal to or larger than a predetermined value.

A refrigeration cycle device comprising

• a refrigeration cycle circuit that includes a compressor including an electric motor;
• a condenser;
• an expansion valve;
• and an evaporator;
• the compressor, the condenser, the expansion valve, and the evaporator being connected to each other,
• wherein
• a working fluid containing 1,1,2-trifluoroethylene and difluoromethane is used as a refrigerant sealed in the refrigeration cycle circuit,
• the refrigeration cycle device further includes an electric motor driving device that drives the electric motor,
• the electric motor driving device includes a rotational speed estimator,
• the electric motor driving device includes a voltage detector that detects a voltage input to the electric motor driving device, and
• the electric motor driving device is configured to stop supplying electric power to the electric motor when a change rate of a detection value detected by the voltage detector is smaller than a predetermined value.

A refrigeration cycle device comprising:

• a refrigeration cycle circuit that includes a compressor including an electric motor;
• a condenser;
• an expansion valve;
• and an evaporator;
• the compressor, the condenser, the expansion valve, and the evaporator being connected to each other,
• wherein
• a working fluid containing 1,1,2-trifluoroethylene and difluoromethane is used as a refrigerant sealed in the refrigeration cycle circuit,
• the refrigeration cycle device further includes an electric motor driving device that drives the electric motor, and
• the electric motor driving device includes a rotational speed estimator,
• wherein the electric motor driving device is configured to stop a supply of electric power to the electric motor upon occurrence of rotation abnormality of the electric motor,
• the electric motor driving device includes a voltage detector that detects a voltage input to the electric motor driving device,
• the refrigeration cycle device further includes a high-pressure-side pressure detector that is provided between a discharge part of the compressor and an inlet of the expansion valve,
• the electric motor driving device detects a voltage input to the electric motor driving device, and
• the electric motor driving device is configured to stop supplying electric power to the electric motor in cases where a detection value detected by the high-pressure-side pressure detector is equal to or larger than a predetermined value and where a change rate of a detection value detected by the voltage detector is smaller than a predetermined value.