| 摘要 |
PROBLEM TO BE SOLVED: To provide a refrigerating cycle device capable of driving an expansion machine with high reliability including starting 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: This refrigerating cycle device comprises 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 18 capable of being operated as a normal convertor and a reverse convertor, and the expansion machine 2 is started by power running of the rotating machine 2b by the rotating machine control device 18, before starting a compressor 1. Thus sudden increase of rotational frequency of the expansion machine 2 immediately after expansion energy generated by driving the compressor 1 gets more than static frictional force of the expansion machine 2, can be prevented in starting the expansion machine 2. COPYRIGHT: (C)2007,JPO&INPIT
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