Daikin Industries, Ltd.

Masatoshi Hirano

Mikio Kajiwara

Keiji Komori

Kazuo Ida

Ryohei Deguchi

Nobuhiro Nojima

A high-pressure, dome-type compressor includes a DC motor having a rotor that uses a rare earth/iron/boron permanent magnet having an intrinsic coercive force of 1.7 MA.m or greater in a rotor thereof and has a rated output or 1.9 kW or higher. The motor, which drives a compression element in a casing , is disposed in a high pressure, high temperature area , which is filled with gas discharged from the compression element. An inverter controls current supplied to the motor such that the motor temperature becomes equal to or less than a predetermined temperature and an opposing magnetic field generated in a stator has a predetermined strength or less. Since the magnet does not reach a high temperature and is not exposed to a strong opposing magnetic field, it is hardly demagnetized. As a result, performance of the motor and of the compressor is stable.

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Kusatsu, Japan

Masatoshi Hirano