Airtight motor compressor

• Main Authors: SHIGEYA KAWAMINAMI, RYUNOSUKE TAKANO, AKIHIRO MURAKAMI, ATSUSHI SHIMADA
• Format: Patent
• Language: Chinese; English
• Published: 15.01.2014
• Subjects: BLASTING; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION; HEATING; LIGHTING; MECHANICAL ENGINEERING; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTMACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTPUMPS; WEAPONS

The invention provides an airtight motor compressor which ensures the magnetic force of a motor and improves the retentivity of a Nd-Fe-B sintered magnet. The airtight motor compressor has compressing mechanism part which compresses a refrigerant and a motor that drives the compressing mechanism part, wherein the motor includes a stator having a coil and a rotor having an iron core and a permanent magnet, the permanent magnet consists of a Nd-Fe-B compound with middle-heavy rare earth elements being added, the refrigerant is R32, and the amount of the middle-heavy rare earth elements per unit volume of the Nd-Fe-B compound with a grain boundary from a parent-phase grain being 5nm is more than that of the Nd-Fe-B compound with a grain boundary from the parent-phase grain being closer to an inner part than 5nm.