REFRIGERATION CYCLE DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a refrigerating cycle device capable of driving an expansion machine with high reliability including stopping by controlling rotational frequency of a rotating machine by estimating a magnetic pole position of a rotor of the rotating machine mounted in the expansion machine.

SOLUTION: The refrigeration cycle device equipped with the expansion machine 2 includes: an induced voltage estimating portion 24 for estimating induced voltage generated in each phase of a stator winding of the rotating machine 2b mounted in the expansion machine 2; a rotor position/speed detecting portion 25 for estimating magnetic pole position and speed of the rotor of the rotating machine 2b on the basis of the induced voltage estimated by the induced voltage estimating portion 24; and a rotating machine control device 18 including a power convertor 19 capable of being operated as a normal convertor and a reverse convertor. The expansion machine 2 is constrained by making a direct current electricity flow to the rotating machine 2b by the rotating machine control device 18 from immediately after the compressor 1 stops until a predetermined time has passed.

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