公开(公告)号：US10590934B2

公开(公告)日：2020-03-17

申请号：US15567558

申请日：2016-06-07

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Fuminori Sakima ,  Akira Fujitaka ,  Hiroaki Nakai ,  Akihiro Kyogoku ,  Hideaki Matsuo ,  Shigehiro Sato ,  Kenji Takaichi

IPC: F25B49/02 ,  F04C29/00 ,  F04B49/10 ,  F04B39/00 ,  F25B1/00 ,  F25B1/02 ,  F25B9/00

Abstract: The present invention includes a refrigeration cycle circuit that includes compressor, indoor heat exchanger, expansion valve, and outdoor heat exchanger that are connected to each other. A working fluid containing R1123 (1,1,2-trifluoroethylene) and R32 (difluoromethane) is used as a refrigerant sealed in the refrigeration cycle circuit, and an electric motor driving device that drives an electric motor of compressor includes a rotational speed estimator. The rotational speed estimator estimates rotational speed based on information on a detection value of an electric current input to the electric motor or a magnetic pole position of a rotor that constitutes the electric motor.